JB/T 5133-1991 Die-cast magnesium alloys for rock drilling machinery and pneumatic tools
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB 5133—91
Rock Drilling Machinery and Pneumatic Tools
Die Casting Magnesium Alloy Castings
General Technical Conditions
Published on 1991~05-18
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Implemented on 1992-01-01
Mechanical Industry Standard of the People's Republic of China
General Technical Conditions for Die Casting Magnesium Alloy Castings for Rock Drilling Machinery and Pneumatic Tools
Subject Content and Scope of Application
JB 5133--91
This standard specifies the general requirements for the categories and grades, basic dimensions, tolerance grades, physical and chemical inspection casting slopes, die casting threads, shape and position tolerances of die cast magnesium alloy castings for rock drilling machinery and pneumatic tools. This standard applies to die cast magnesium alloy castings (hereinafter referred to as die castings) for rock drilling machinery and pneumatic tools. Cited standards
GB 6060. 1
Surface roughness comparison sample casting surface
JB 3070
ZB J84 012
JB3906
JB3072
Technical conditions for die-casting magnesium alloys
Rock drilling machinery and pneumatic tools
General technical conditions for die-casting aluminium alloys
General technical conditions for magnesium alloy castings for rock drilling machinery and pneumatic tools Non-ferrous alloy test specimens
Categories and grades of die castings
Die castings are divided into three categories according to their use requirements, see Table 1. Table 1
Categories of die castings
Key die castings subject to large dynamic loads, static loads and alternating loads: die castings with high relative motion speed
Important die castings subject to medium dynamic loads, static loads and other working conditionsLow-load die castings for general use
3.2 The surface quality of die castings is divided into three levels according to the scope of use, see Table 2. Table 2
Surface quality level
Level symbol
Scope of use
Surfaces with high coating process requirements; chrome-plated, polished, ground surfaces, relative motion matching surfaces, surfaces in dangerous stress areas, etc.
Surfaces with general coating requirements or sealing requirements; galvanized, anodized, painted without putty, and assembly contact surfaces, etc.
Protective coating surfaces and fastening contact surfaces, painted putty surfaces and other surfaces Note: When the surface roughness does not meet the requirements of Table 2, other process methods are allowed to meet the requirements. Inspection items approved by the Ministry of Machinery and Electronics Industry on May 18, 1991
Surface quality, dimensional accuracy, chemical composition, mechanical properties, air tightness
Surface quality, dimensional accuracy, chemical composition, mechanical properties
Surface quality, dimensional accuracy, chemical compositionAchievable surface roughness R value
Equivalent to 1.6
Equivalent to 3.2
Equivalent to 6.3
Implemented on January 1, 1992
JB5133--91
3.3 When the same die casting has more than two surface quality levels, the level that occupies the largest surface area of the casting shall be the standard. Other surfaces with special requirements shall be specified on the drawings.
3.4 The category and surface quality level of die castings shall be indicated on the drawings, and the expression method is as follows: ZBJ84×X×-××-
Surface quality level of die castings
- Die casting category
Standard number of die castings
3.5 The surface roughness inspection of die castings shall be carried out in accordance with the provisions of GB6060.1. 4 Basic dimensional tolerance grade of die castings
The basic dimensional tolerance grade of die castings is divided into three grades, see Table 3. 4.1
Basic dimensions of die castings
>6～10
>10～16
>16～25
>25～40
>40～63
>63～100
>100～160
>160～250
>250～400
>400～630
Dimensional tolerance grade of die castings
Note: ① This table includes the increase in dimensional tolerance due to the influence of parting surface and core. ② The hole center gauge is included in the basic size grade of die castings. 4.2 The radius tolerance of the arc of the die casting shall be in accordance with the provisions of Article 3.2 of ZBJ84012, Grade 3
4.3 The angle and taper tolerance of the die casting shall be in accordance with the provisions of Table 4. The taper tolerance is determined by the length of the cone generatrix, and the angle tolerance is determined by the length of the short side of the angle.
For die castings whose category, grade and dimensional accuracy are not specified, they shall be handled in accordance with the lowest category and grade of this standard. 4.4
Aa(±）)
5 Chemical composition inspection of die castings
JB5133--91
5.1 The analysis method of the chemical composition of die castings shall be carried out in accordance with the provisions of Article 3.1 of JB3070. 5.2 The inspection results of the chemical composition of die castings shall comply with the provisions of Article 2.1 of JB3070. 5.3 The chemical composition of die castings shall be inspected only by sampling, not by furnace or batch. 5.4 When the mechanical properties are unqualified, the chemical composition analysis of the castings must be carried out. 6 Mechanical Properties Inspection of Die Castings
6.1 The inspection method of mechanical properties of die castings shall be carried out in accordance with the provisions of Article 3.2 of JB3070. 6.2 The inspection of mechanical properties of die castings shall be inspected only by sampling, not by furnace or batch. The single cast specimens of the same furnace as the castings shall be used for sampling, and the inspection method and results shall comply with the provisions of JB3070. 6.3 When quality analysis of die castings is necessary, body sampling shall be taken. The sampling location is not specified and shall be determined by the inspection department. Its shape and size shall comply with the provisions of JB3072. The tensile strength () of the body sampling shall not be less than 75% of the single cast specimen, and the elongation (8) shall not be less than 50% of the single cast specimen. There are three test specimens in each group; if two of the three tested specimens fail to meet the mechanical properties, the inspection batch is unqualified. However, it is allowed to use doubled test specimens for a second inspection. If two of the second inspection specimens fail but the total average value is qualified, the inspection batch is considered qualified. If there are more than two unqualified test specimens, the inspection batch is considered unqualified. 7 Casting inclination of die castings
7.1 The casting inclination of die castings refers to the single-sided inclination of the wall, and this is also true for circular surfaces. 7.2 The casting inclination of die castings is not included in the tolerance range. For non-machined surfaces, the hole is based on the small end and the shaft is based on the large end. For machined surfaces, the hole is based on the large end and the shaft is based on the small end. 7.3 The casting inclination of the inner cavity of the die casting shall be in accordance with the provisions of Table 5. The casting inclination of the outer wall of the die casting is 1/2 of the casting inclination of the inner cavity. Table 5
Inner cavity dimensions of die castings
Casting slope
>6~8
>10~15
7.4The diameter of the die casting holes and the maximum hole depth casting slope of die castings shall be in accordance with the provisions of 7.4.1~7.4.2. >20~30
>30~60
JB 5133-91
7.4.1The minimum hole diameter and slope of die castings shall be in accordance with the provisions of Table 6. Table 6
The maximum hole depth of die casting holes shall be in accordance with the provisions of Table 7. 7.4.2
Diameter of hole
Maximum hole depth
7.5The minimum casting slope of die castings shall be in accordance with the provisions of Table 8. Casting
7.6The casting slope of the text and symbols on the surface of die castings shall be 10°~25°. 8 Die-casting threads
The die-casting threads of die-casting parts shall be inspected in accordance with the provisions of Article 7 of ZBJ84012. Die-casting threads are allowed to have misaligned teeth not exceeding 1/10 of the pitch value. 8.1
Die-casting threads are only allowed to be inspected with a through-end gauge and are allowed to meet the accuracy requirements after correction. 8.2The minimum diameter and minimum pitch of die-casting threads shall be in accordance with the provisions of Table 9. Table 9
Minimum thread diameter
Two-half cavity composition
Thread type ring composition
Internal thread
Minimum pitch
8.3Surface scratches caused by removing the casting from the mold (from the thread core) are allowed, but the first two tooth types of the thread are not allowed to have undercasting or cavities.
8.4For die-casting internal and external threads, between each pitch after the first two teeth, it is not allowed that the tops of the two teeth have a continuous unclear contour with a depth greater than 1/5 of the pitch value.
9 Machining allowance of die castings
9.1 The machining allowance of die castings shall comply with the provisions of Table 10. Table 10
Maximum size of machining surface
>50～120
>120～260
>260~~400
>400~630
9.2 The machining allowance of large castings with a wall thickness exceeding 5mm shall not exceed 0.8～1mm4
Single-sided machining allowance
JB 5133-91
9.3The machined surface is indicated by the symbol →, with the tip pointing to the machined surface and the machining allowance indicated on the left. Example 9 indicates that the surface has a machining allowance of
0.50mm.
10 Surface shape and position tolerance of die castings 10.1 The surface shape tolerance of die castings shall be within the tolerance range of the corresponding size. 10.2 The flatness tolerance of die castings shall be in accordance with the provisions of Table 11. Table 11
Basic dimensions
Tolerance before shaping
Tolerance after shaping
>25~63
Parallelism tolerance of die castings shall be in accordance with the provisions of Table 12. 10.3
>63～100
The position of the measuring surface and the base
quasi-surface
Basic dimensions
>25～63
>63～100
>100～160
>160～250
>250～400
Tolerance within the same half mold
The coaxiality tolerance of die castings shall be as specified in Table 13. 10.4
11 Cleaning of die castings
>100~~160
>160~250
Tolerance in two half molds
62
>250-400
Tolerance of two active parts in the same half mold
3
The gates, wings, overflow grooves, burrs, and skins of die castings should be cleaned up, and the non-processed surfaces should be cleaned flush with the surface of the die castings. Cleaning traces are allowed. The residual amount on the processed surface after cleaning shall not exceed 1.50mm. The burr thickness at the parting surface of the die casting shall not exceed 0.3mm. The burr thickness around the ejector pin shall not exceed 0.1mm. 5
JB5133--91
Position of axis and reference axis
Surface quality of die castings
12.1 Die castings are not allowed to have cracks, undercasting and other penetrating defects. In the
two half molds,
inner diameter
～120
12.2 Die castings should be surface treated. After treatment, flux inclusions are not allowed on all surfaces of the castings. 12.3 The process reference surface indicated on the die casting part drawing should maintain its integrity and must be flat. 12.4 The patterns, texts and symbols on the die castings should be clear. Ruler
12.5 Patterns, colored spots, marks within the dimensional tolerance range, unclear outlines and pitting that do not affect use are allowed. Without affecting the use and assembly, the casting is allowed to have mesh burrs and marks with a height of no more than 0.30mm. 12.6 The various defects allowed on the unprocessed surface of the die casting shall be in accordance with the provisions of Table 14. Any defects within the range of machining allowance are allowed. 12.7 After the die casting is machined, the number of holes allowed on the surface shall be in accordance with the provisions of Table 15. 12.8 For the machined threads on the die casting, except for the first two teeth, holes are not allowed. The remaining surface quality requirements shall be in accordance with the provisions of Table 16. 13 Delivery of die castings
The delivery of die castings shall be filled in with a certificate of conformity or a warehousing form, and shall be stamped by the inspector. 13.2 The certificate of conformity or the warehousing form shall indicate:
Name of die casting,
Code:
Alloy grade,
Quantity,
Time.
13.3 The delivery of die castings shall be accompanied by the test results of chemical composition and mechanical properties, and shall be stamped by the inspector. 13.4
The packaging of die castings shall ensure that there is no mechanical damage during transportation. The user is allowed to re-inspect the die castings according to the relevant provisions of this standard. 13.5
Defect name
Ejector mark
Corner defect
Adhesion mark
Total of various defects
Defect range
Single loose part shall not exceed
JB 5133---91
Number of places not allowed to exceed per 100cm2
Number of places not allowed to exceed for the entire casting
Depth not greater than
Area, not exceeding the percentage of the total area
Depth not greater than
Area, not exceeding the percentage of the total area
Depth of depression not greater than
Protrusion not greater than
Recess not greater than
Casting side length not greater than 100, depth not greater than Casting side length greater than 100 Depth not greater than
Depth not greater than
Table of defects with defects Percentage of area
Length is not greater than
Number not allowed to exceed on the surface
Distance from the edge of the casting is not less than
Spacing between two cold breaks is not less than
Number not allowed to exceed per 100cm2
Number not allowed to exceed in the entire casting
Distance from the edge of the casting is not less than
Deepness of concave is not greater than
Number not allowed to exceed per 100cm*
Number not allowed to exceed in the entire casting
Distance from the edge of the casting is not less than
Deepness of pore concave is not large The area shall not exceed the percentage of the total area. The sealing requirements of the part drawing shall be met. Only for decorative surfaces (chrome plating, polishing, grinding) with requirements. In addition to the first-level surface, the cast surface is allowed to add one defect. The length shall not exceed 5% of the length. The entire casting is allowed to have. The corresponding parts in the same part are not allowed to exist at the same time. Two types of bubbles are allowed to exist at the same time, but large pores are not allowed to exist at the same time. tt||No more than 3, total number
No more than 10, the distance from
edge is not less than
Defect name
Average diameter
Depth is not greater than
Distance from the edge of the casting is not greater than
The distance between two holes is not less than
Number of holes per 100cm2 does not exceed
Total number of single holes in the casting does not exceed
The maximum diameter of the hole is not greater thanwwW.bzxz.Net
Depth is not greater than
Number of holes per 10cm2 does not exceed
Concentrated holes in the casting do not exceed
JB 5133—91
Note: ①It is not allowed that pores and holes exist at the same corresponding position of the same part. ②The depth of the hole shall not exceed 1/5 of the wall thickness of the part where it is located. ③ Every 10cm? refers to the area of the circle or square that can accommodate the largest number of defects. ① Two defects are allowed to exist on the same processing surface, but the margin should be ≥2mm. ③ After the holes on the casting are processed, the distance between the holes on the surface and the end face is ≥2mm. Table 16
The average diameter is not greater than
Additional instructions:
The depth is not greater than
(not more than 1/4 of the wall thickness)
The number of per three pitch circles
does not exceed
This standard is proposed and managed by Tianshui Rock Drilling Machinery Pneumatic Tool Research Institute. This standard is drafted by Yichun Pneumatic Tool Factory. The main drafter of this standard is Liu Jinsheng.
1.5～2.0
5～10
2.0～3. 0
5～ 15
The total number of edges between two holes
within the thread working length
does not exceed
and the distance is not less than4
11Cleaning of die castings
>100~~160
>160~250
Tolerance in two half molds62
>250-400
Tolerance of two active parts in the same half mold3
The gates, wings, overflow grooves, burrs, and skins of die castings should be cleaned. The non-processed surfaces should be cleaned flush with the surface of the die castings. Cleaning traces are allowed. The residual amount on the processed surface after cleaning shall not exceed 1.50mm. The burr thickness at the parting surface of the die casting shall not exceed 0.3mm. The burr thickness around the ejector shall not exceed 0.1mm. 5
JB5133--91
Position of axis and reference axis
Surface quality of die casting
12.1 Die castings are not allowed to have cracks, undercasting and other penetrating defects. In the
two half molds,
inner diameter
～120
12.2 Die castings should be surface treated. After treatment, flux inclusions are not allowed on all surfaces of the castings. 12.3 The process reference surface indicated on the die casting part drawing should maintain its integrity and must be flat. 12.4 The patterns, texts and symbols on the die castings should be clear. Ruler
12.5 Patterns, colored spots, marks within the dimensional tolerance range, unclear outlines and pitting that do not affect use are allowed. Without affecting the use and assembly, the casting is allowed to have mesh burrs and marks with a height of no more than 0.30mm. 12.6 The various defects allowed on the unprocessed surface of the die casting shall be in accordance with the provisions of Table 14. Any defects within the range of machining allowance are allowed. 12.7 After the die casting is machined, the number of holes allowed on the surface shall be in accordance with the provisions of Table 15. 12.8 Except for the first two teeth, the machined threads on the die casting are not allowed to have holes. The remaining surface quality requirements shall be in accordance with the provisions of Table 16. 13 Delivery of die castings
The delivery of die castings shall be filled in with a certificate of conformity or a storage order, and shall be stamped by the inspector. 13.2 The certificate of conformity or the storage order shall indicate:
Name of die casting,
Code:
Alloy grade,
Quantity,
Time.
13.3 The delivery of die castings shall be accompanied by the test results of chemical composition and mechanical properties, and shall be stamped by the inspector. 13.4
The packaging of die castings shall ensure that there is no mechanical damage during transportation. The user is allowed to re-inspect the die castings according to the relevant provisions of this standard. 13.5
Defect name
Ejector mark
Corner defect
Adhesion mark
Total of various defects
Defect range
Single loose part shall not exceed
JB 5133---91
Number of places not allowed to exceed per 100cm2
Number of places not allowed to exceed for the entire casting
Depth not greater than
Area, not exceeding the percentage of the total area
Depth not greater than
Area, not exceeding the percentage of the total area
Depth of depression not greater than
Protrusion not greater than
Recess not greater than
Casting side length not greater than 100, depth not greater than Casting side length greater than 100 Depth not greater than
Depth not greater than
Table of defects with defects Percentage of area
Length is not greater than
Number not allowed to exceed on the surface
Distance from the edge of the casting is not less than
Spacing between two cold breaks is not less than
Number not allowed to exceed per 100cm2
Number not allowed to exceed in the entire casting
Distance from the edge of the casting is not less than
Deepness of concave is not greater than
Number not allowed to exceed per 100cm*
Number not allowed to exceed in the entire casting
Distance from the edge of the casting is not less than
Deepness of pore concave is not large The area of the casting shall not exceed the percentage of the total area. The sealing requirements of the part drawing shall be met. It is limited to the decorative (chrome-plated, polished, ground) surface. In addition to the first-level surface, the cast surface is allowed to add one defect. The length shall not exceed 5% of the length. The entire casting is allowed to have a defect. The corresponding parts of the casting are not allowed to exist at the same time. Two types of bubbles are allowed to exist at the same time, but the air pores are not allowed to exist at the same time. tt||No more than 3, total number
No more than 10, the distance from
edge is not less than
Defect name
Average diameter
Depth is not greater than
Distance from the edge of the casting is not greater than
The distance between two holes is not less than
Number of holes per 100cm2 does not exceed
Total number of single holes in the casting does not exceed
The maximum diameter of the hole is not greater than
Depth is not greater than
Number of holes per 10cm2 does not exceed
Concentrated holes in the casting do not exceed
JB 5133—91
Note: ①It is not allowed that pores and holes exist at the same corresponding position of the same part. ②The depth of the hole shall not exceed 1/5 of the wall thickness of the part where it is located. ③ Every 10cm? refers to the area of the circle or square that can accommodate the largest number of defects. ① Two defects are allowed to exist on the same processing surface, but the margin should be ≥2mm. ③ After the holes on the casting are processed, the distance between the holes on the surface and the end face is ≥2mm. Table 16
The average diameter is not greater than
Additional instructions:
The depth is not greater than
(not more than 1/4 of the wall thickness)
The number of per three pitch circles
does not exceed
This standard is proposed and managed by Tianshui Rock Drilling Machinery Pneumatic Tool Research Institute. This standard is drafted by Yichun Pneumatic Tool Factory. The main drafter of this standard is Liu Jinsheng.
1.5～2.0
5～10
2.0～3. 0
5～ 15
The total number of edges between two holes
within the thread working length
does not exceed
and the distance is not less than4
11Cleaning of die castings
>100~~160
>160~250
Tolerance in two half molds62
>250-400
Tolerance of two active parts in the same half mold3
The gates, wings, overflow grooves, burrs, and skins of die castings should be cleaned. The non-processed surfaces should be cleaned flush with the surface of the die castings. Cleaning traces are allowed. The residual amount on the processed surface after cleaning shall not exceed 1.50mm. The burr thickness at the parting surface of the die casting shall not exceed 0.3mm. The burr thickness around the ejector shall not exceed 0.1mm. 5
JB5133--91
Position of axis and reference axis
Surface quality of die castings
12.1 Die castings are not allowed to have cracks, undercasting and other penetrating defects. In the
two half molds,
inner diameter
～120
12.2 Die castings should be surface treated. After treatment, flux inclusions are not allowed on all surfaces of the castings. 12.3 The process reference surface indicated on the die casting part drawing should maintain its integrity and must be flat. 12.4 The patterns, texts and symbols on the die castings should be clear. Ruler
12.5 Patterns, colored spots, marks within the dimensional tolerance range, unclear outlines and pitting that do not affect use are allowed. Without affecting the use and assembly, the casting is allowed to have mesh burrs and marks with a height of no more than 0.30mm. 12.6 The various defects allowed on the unprocessed surface of the die casting shall be in accordance with the provisions of Table 14. Any defects within the range of machining allowance are allowed. 12.7 After the die casting is machined, the number of holes allowed on the surface shall be in accordance with the provisions of Table 15. 12.8 For the machined threads on the die casting, except for the first two teeth, holes are not allowed. The remaining surface quality requirements shall be in accordance with the provisions of Table 16. 13 Delivery of die castings
The delivery of die castings shall be filled in with a certificate of conformity or a warehousing form, and shall be stamped by the inspector. 13.2 The certificate of conformity or the warehousing form shall indicate:
Name of die casting,
Code:
Alloy grade,
Quantity,
Time.
13.3 The delivery of die castings shall be accompanied by the test results of chemical composition and mechanical properties, and shall be stamped by the inspector. 13.4
The packaging of die castings shall ensure that there is no mechanical damage during transportation. The user is allowed to re-inspect the die castings according to the relevant provisions of this standard. 13.5
Defect name
Ejector mark
Corner defect
Adhesion mark
Total of various defects
Defect range
Single loose part shall not exceed
JB 5133---91
Number of places not allowed to exceed per 100cm2
Number of places not allowed to exceed for the entire casting
Depth not greater than
Area, not exceeding the percentage of the total area
Depth not greater than
Area, not exceeding the percentage of the total area
Depth of depression not greater than
Protrusion not greater than
Recess not greater than
Casting side length not greater than 100, depth not greater than Casting side length greater than 100 Depth not greater than
Depth not greater than
Table of defects with defects Percentage of area
Length is not greater than
Number not allowed to exceed on the surface
Distance from the edge of the casting is not less than
Spacing between two cold breaks is not less than
Number not allowed to exceed per 100cm2
Number not allowed to exceed in the entire casting
Distance from the edge of the casting is not less than
Deepness of concave is not greater than
Number not allowed to exceed per 100cm*
Number not allowed to exceed in the entire casting
Distance from the edge of the casting is not less than
Deepness of pore concave is not large The area shall not exceed the percentage of the total area. The sealing requirements of the part drawing shall be met. Only for decorative surfaces (chrome plating, polishing, grinding) with requirements. In addition to the first-level surface, the cast surface is allowed to add one defect. The length shall not exceed 5% of the length. The entire casting is allowed to have. The corresponding parts in the same part are not allowed to exist at the same time. Two types of bubbles are allowed to exist at the same time, but large pores are not allowed to exist at the same time. tt||No more than 3, total number
No more than 10, its distance from
edge is not less than
Defect name
Average diameter
Depth is not greater than
Distance from the edge of the casting is not greater than
The distance between two holes is not less than
Number of holes per 100cm2 does not exceed
Total number of single holes in the casting does not exceed
The maximum diameter of the hole is not greater than
Depth is not greater than
Number of holes per 10cm2 does not exceed
Concentrated holes in the casting do not exceed
JB 5133—91
Note: ①It is not allowed that pores and holes exist at the same corresponding position of the same part. ②The depth of the hole shall not exceed 1/5 of the wall thickness of the part where it is located. ③ Every 10cm? refers to the area of the circle or square that can accommodate the largest number of defects. ① Two defects are allowed to exist on the same processing surface, but the margin should be ≥2mm. ③ After the holes on the casting are processed, the distance between the holes on the surface and the end face is ≥2mm. Table 16
The average diameter is not greater than
Additional instructions:
The depth is not greater than
(not more than 1/4 of the wall thickness)
The number of per three pitch circles
does not exceed
This standard is proposed and managed by Tianshui Rock Drilling Machinery Pneumatic Tool Research Institute. This standard is drafted by Yichun Pneumatic Tool Factory. The main drafter of this standard is Liu Jinsheng.
1.5～2.0
5～10
2.0～3. 0
5～ 15
The total number of edges between two holes
within the thread working length
does not exceed
and the distance is not less than5
Defect name
Trace of ejector pin
Incomplete corner
Trace of adhesion
Total of various defects
Defect range
Single loose part is not greater than
JB 5133---91
Number of places not allowed to exceed per 100cm2
Number of places not allowed to exceed for the whole casting
Depth is not greater than
Area, not exceeding the percentage of the total area
Depth is not greater than
Area, not exceeding the percentage of the total area
Depth of depression is not greater than
Protrusion is not greater than
Recess is not greater than
Casting side length is not greater than 100, depth is not greater than Casting side length is greater than 100 Depth is not greater than
Depth is not greater than
Table of defects with defects Percentage of area
Length is not greater than
Number not allowed to exceed on the surface
Distance from the edge of the casting is not less than
Spacing between two cold breaks is not less than
Number not allowed to exceed per 100cm2
Number not allowed to exceed in the entire casting
Distance from the edge of the casting is not less than
Deepness of concave is not greater than
Number not allowed to exceed per 100cm*
Number not allowed to exceed in the entire casting
Distance from the edge of the casting is not less than
Deepness of pore concave is not large The area of the casting shall not exceed the percentage of the total area. The sealing requirements of the part drawing shall be met. It is limited to the decorative (chrome-plated, polished, ground) surface. In addition to the first-level surface, the cast surface is allowed to add one defect. The length shall not exceed 5% of the length. The entire casting is allowed to have a defect. The corresponding parts of the casting are not allowed to exist at the same time. Two types of bubbles are allowed to exist at the same time, but the air pores are not allowed to exist at the same time. tt||No more than 3, total number
No more than 10, the distance from
edge is not less than
Defect name
Average diameter
Depth is not greater than
Distance from the edge of the casting is not greater than
The distance between two holes is not less than
Number of holes per 100cm2 does not exceed
Total number of single holes in the casting does not exceed
The maximum diameter of the hole is not greater than
Depth is not greater than
Number of holes per 10cm2 does not exceed
Concentrated holes in the casting do not exceed
JB 5133—91
Note: ①It is not allowed that pores and holes exist at the same corresponding position of the same part. ②The depth of the hole shall not exceed 1/5 of the wall thickness of the part where it is located. ③ Every 10cm? refers to the area of the circle or square that can accommodate the largest number of defects. ① Two defects are allowed to exist on the same machined surface, but the margin should be ≥2mm. ③ After the holes on the casting are machined, the distance between the holes on the surface and the end face is ≥2mm. Table 16
The average diameter is not greater than
Additional instructions:
The depth is not greater than
(not more than 1/4 of the wall thickness)
The number of per three pitch circles
does not exceed
This standard is proposed and managed by Tianshui Rock Drilling Machinery Pneumatic Tool Research Institute. This standard is drafted by Yichun Pneumatic Tool Factory. The main drafter of this standard is Liu Jinsheng.
1.5～2.0
5～10
2.0～3. 0
5～ 15
The total number of edges between two holes
within the thread working length
does not exceed
and the distance is not less than5
Defect name
Trace of ejector pin
Incomplete corner
Trace of adhesion
Total of various defects
Defect range
Single loose part is not greater than
JB 5133---91
Number of places not allowed to exceed per 100cm2
Number of places not allowed to exceed for the whole casting
Depth is not greater than
Area, not exceeding the percentage of the total area
Depth is not greater than
Area, not exceeding the percentage of the total area
Depth of depression is not greater than
Protrusion is not greater than
Recess is not greater than
Casting side length is not greater than 100, depth is not greater than Casting side length is greater than 100 Depth is not greater than
Depth is not greater than
Table of defects with Percentage of area
Length is not greater than
Number not allowed to exceed on the surface
Distance from the edge of the casting is not less than
Spacing between two cold breaks is not less than
Number not allowed to exceed per 100cm2
Number not allowed to exceed in the entire casting
Distance from the edge of the casting is not less than
Deepness of concave is not greater than
Number not allowed to exceed per 100cm*
Number not allowed to exceed in the entire casting
Distance from the edge of the casting is not less than
Deepness of pore concave is not large The area of the casting shall not exceed the percentage of the total area. The sealing requirements of the part drawing shall be met. It is limited to the decorative (chrome-plated, polished, ground) surface. In addition to the first-level surface, the cast surface is allowed to add one defect. The length shall not exceed 5% of the length. The entire casting is allowed to have a defect. The corresponding parts of the casting are not allowed to exist at the same time. Two types of bubbles are allowed to exist at the same time, but the air pores are not allowed to exist at the same time. tt||No more than 3, total number
No more than 10, the distance from
edge is not less than
Defect name
Average diameter
Depth is not greater than
Distance from the edge of the casting is not greater than
The distance between two holes is not less than
Number of holes per 100cm2 does not exceed
Total number of single holes in the casting does not exceed
The maximum diameter of the hole is not greater than
Depth is not greater than
Number of holes per 10cm2 does not exceed
Concentrated holes in the casting do not exceed
JB 5133—91
Note: ①It is not allowed that pores and holes exist at the same corresponding position of the same part. ②The depth of the hole shall not exceed 1/5 of the wall thickness of the part where it is located. ③ Every 10cm? refers to the area of the circle or square that can accommodate the largest number of defects. ① Two defects are allowed to exist on the same processing surface, but the margin should be ≥2mm. ③ After the holes on the casting are processed, the distance between the holes on the surface and the end face is ≥2mm. Table 16
The average diameter is not greater than
Additional instructions:
The depth is not greater than
(not more than 1/4 of the wall thickness)
The number of per three pitch circles
does not exceed
This standard is proposed and managed by Tianshui Rock Drilling Machinery Pneumatic Tool Research Institute. This standard is drafted by Yichun Pneumatic Tool Factory. The main drafter of this standard is Liu Jinsheng.
1.5～2.0
5～10
2.0～3. 0
5～ 15
The total number of edges between two holes
within the thread working length
does not exceed
and the distance is not less than
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