This standard specifies the basic parameters, technical requirements, test methods and inspection rules for the molds used for the molding sand test. This standard applies to the molding sand test molds (hereinafter referred to as molds) used in the molding sand performance test. JB/T 6794-1993 Molds for molding sand test JB/T6794-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 6794-1993
Molds for Sand Testing
Published on July 9, 1993
Ministry of Machinery Industry of the People's Republic of China
Implemented on January 1, 1994
Mechanical Industry Standard of the People's Republic of China
Molds for Sand Testing
Subject Content and Scope of Application
This standard specifies the basic parameters, technical requirements, test methods and inspection rules for molds for sand testing. This standard applies to the sand testing molds (hereinafter referred to as molds) used in the performance test of sand. 2
Reference standards
GB2684
GB 1800~1804
GB/T 13306
ZBY002
ZBY003
ZB N62 009
Basic parameters
Raw sand and mixture for casting
Tolerance and fit
Test methods
Basic environmental conditions and test methods for transportation and storage of instruments and metersGeneral technical conditions for packaging of instruments and meters
Technical conditions for high-temperature strength tester of molding sand
Basic parameters of the mold should comply with the provisions of Table 1: Table 1
Mold name
Cylindrical sample tube
Anti-sand inclusion sample tube
Tensile strength core box
Transverse bending strength core box
Wet tensile strength sample tube
Hot and wet tensile strength sample tube
Technical requirements
Normal working environment Conditions
Shape of inner cavity wheel
Cylindrical
Pie shape
“8” shape
Strip
Cylindrical
Cylindrical
a. Ambient temperature: 5℃~40℃;
Relative humidity: not more than 85%;
Basic size of inner cavity
950×120
30×120
p135×40
According to the relevant standards of GB2684
Specimen size regulations
950×52
50×52
No strong vibration around, dry and clean, no corrosive gas exists. Approved by the Ministry of Machinery Industry on July 9, 1993
Overall dimensions
60×120
440×120
P150×100
104×50×62
190×50×60
56×52
56×52
JB/T67941993
It consists of an upper die, a middle die and a die
bottom plate
It consists of an upper and lower sample cylinder.
The mold opened radially at 1/2 of the height
Composed of a sample ring and a sample tube
The mold opened radially at 1/5 of the height
Implemented on January 1, 1994
JB/T 67941993
4.2The hardness value of the inner cavity of the mold (cylindrical sample tube) should be greater than 60HRC (including 60HRC). 4.3The surface roughness parameter R of the inner cavity of the mold is 3.2um (equivalent to V6 of the old standard). 4.4The dimensional tolerance and form and position tolerance of the inner cavity of the mold adopt the ninth level standard tolerance in GB1800~1804, and its code is IT9. 4.5 Appearance quality
a. The outer surface of the mold should be machined and should not have protrusions, depressions or roughness not specified in the drawing. b. The processed surface of the mold cavity should be bright, without rust and obvious scratches. 4.6 Anti-transport environment performance
The mold should comply with the provisions of ZBY002 when transported with the instrument or separately under packaging conditions. Among them: high temperature is +55℃, low temperature is -40℃, and the free fall height is 100mm.
Test method
5.1 The test conditions should comply with the provisions of 4.1. Test instruments
Hardness specimens heat-treated in the same batch as the mold; b.
Special sample for testing tensile strength core box; square ruler, right angle seat and measuring stand with indicator; c.
Vernier caliper, measuring accuracy of 0.02mm, feeler gauge and platform; d.
Surface roughness measuring instrument. The measuring accuracy is 6%. 5.3 Check the hardness of the specimens heat-treated in the same batch as the mold, and its hardness value should comply with the provisions of 4.2. 5.4 Use a surface roughness measuring instrument to check the surface of the mold cavity. The roughness parameter R should meet the requirements of 4.3. 5 Use a platform, a square, a square seat, a feeler gauge, a vernier caliper, a measuring stand with an indicator, and a special sample for checking the tensile strength core box to check the dimensional tolerance and form and position tolerance of the mold cavity. They should meet the requirements of 4.4. 5.6 Visually inspect the appearance quality of the mold and it should meet the requirements of 4.5. 5.7 Inspect the anti-transportation environment performance in accordance with the provisions of ZBY002 and it should meet the requirements of 4.6. 6 Inspection rules
The mold must pass the quality inspection of the manufacturer and be accompanied by a product quality certificate before it can be shipped. 6.1
6.2 The factory inspection items shall be carried out in accordance with the requirements of 4.1~4.5 and the test methods of 5.1 and 5.3~5.6. 6.3 If the factory inspection fails, adjustments are allowed and it can only be shipped after passing the re-inspection. 7 Marking, packaging, transportation, storage
7.1 MarkingwwW.bzxz.Net
The mold should have a product label. Because of its small size, there is no suitable place to bind the label. Some molds are heated with the sample, so the label can be installed on the accessory box of the sample making machine, or marked in the product manual of the relevant instrument. The content of the label should comply with the provisions of GB/T13306.
7.2 Packaging
The packaging of mold products should comply with the provisions of ZBY003. a. Packaging type: composite packaging composed of shockproof and rainproof; b. Packaging material: Class III frame fiberboard wooden box (supplied separately). 2
The mold should be strictly protected from impact and rain during transportation. Storage
JB/T6794-1993
The mold should be stored in a warehouse without corrosive gas and corrosive chemicals. 8
When supplied separately, the user manual, certificate of conformity, packing list and other technical documents of the mold product shall be provided. Additional remarks:
This standard is proposed and managed by the Shenyang Foundry Research Institute of the Ministry of Mechanical and Electrical Engineering. This standard is drafted by the Shenyang Foundry Research Institute of the Ministry of Mechanical and Electrical Engineering. 3
People's Republic of China
Mechanical Industry Standard
Mold for Sand Test
JB/T 67941993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Word count 6.000
Format 880×1230
Sheet 1/2
First edition in December 1993
First printing in December 1993
Print run 1-500
Price 2.00 yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_69 /
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