JB/T 7166-1993 Rock drilling machinery and pneumatic tools cold extrusion parts JB/T7166-1993 standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7166-93
Rock Drilling Machinery and Pneumatic Toolswww.bzxz.net
General Technical Conditions for Cold Extrusion Parts
Published on November 21, 1993
Ministry of Machinery Industry of the People's Republic of China
Implementation on March 1, 1994
Mechanical Industry Standard of the People's Republic of China
Rock Drilling Machinery and Pneumatic Tools
General Technical Conditions for Cold Extrusion Parts
Subject Content and Scope of Application
JB/T7166-93
This standard specifies the classification, technical requirements and inspection rules for cold extrusion parts (hereinafter referred to as extrusion parts) of rock drills and pneumatic tools. This standard applies to parts extruded by metal extruders below 400t. 2 Reference standards
GB3078 Technical conditions for cold-drawn high-quality structural steel GB4424 Ordinary brass rods
GB6478 Technical conditions for cold-drawn steel
3 Classification of extruded parts
Extruded parts are divided into the following categories by deformation methods (see Table 1). Table 1
Categories of holding parts
Reverse extrusion parts
(cup-shaped parts)
Forward extrusion parts
Process characteristics
Metal flow direction and punch movement
Square inquiry
Metal flow direction and punch movement
(solid extruded rods, hollow shaft extruded rods)
Compound extruded parts
Approved by the Ministry of Machinery Industry on November 21, 1993
Partial metal flow direction and punch movement
Movement direction is the same, part is opposite
1994-03-01 implementation
Radial extrusion
Extrusion parts category
Cold-drawn parts
4 Technical requirements
4.1 Requirements for rough materials of extrusion parts
JB/T7166-93
Continued Table 1
Process characteristics
Metal flow direction is perpendicular to the direction of punch movement
4.1.1 The rough material grade of extrusion parts shall comply with the provisions of the product part drawings. Figure
4.1.2 The cold-drawn steel, cold steel and non-ferrous metals used in the rough materials of extrusion parts shall comply with the provisions of GB3078, GB6478 and GB4424.
4.1.3 The materials for the rough parts of extruded parts must be accompanied by a certificate of inspection (quality assurance sheet) and must be inspected at the factory before they can be used. 4.1.4 The rough parts used for extruded parts must be cleaned. 4.1.5 The softening and lubrication treatments of the rough parts of extruded parts should be carried out in accordance with the requirements of the extrusion process regulations. 4.2 Quality requirements for extruded parts
The surface roughness R value of the extruded parts shall comply with the provisions of Table 2, 4.2.1
Surface position of extruded parts
The inner hole surface of the reverse extruded parts, the rod surface of the forward extruded parts (excluding the free end surface), the inner hole surface and the rod surface (excluding the free end surface) of the composite extruded parts, the lower plane of the cold micro-part rental platform
The outer surface of the reverse extruded parts, the cylindrical surface of the rough parts of the forward extruded parts, the tolerance values ​​of the size, shape and position of the extruded parts shall comply with the provisions of Table 3, 4.2.2
Type of holding pressure parts
Reverse extrusion parts Pressed parts
Surface roughness R. value
Dimension, shape and position tolerance values
Extrusion part category
Forward extrusion parts
Cold-pressed parts
JB/T7166-93
Continued Table 3
Rod diameter d
>10~20
>20～30
Float H
Dimension, shape and position tolerance values
≤100
>100~200
>200~300
Rod length!
>20~30
>30~50
Straightness
Coaxiality:
4.2.3 The surface of the folded and pressed parts shall be smooth and complete. The non-machined surface shall not have defects such as cracks, folds, and incomplete filling. The machined surface is allowed to have defects not exceeding 1/2 of the machining allowance.
4.2.4 After obtaining the consent of the relevant technical department, local cracks on the upsetting table of the cold-cut parts may be welded in accordance with the following provisions: a.
Clean the defective surface until good metal is present; b.
Weld with welding rods of the same or similar materials; grind and smooth after welding.
Inspection rules
Extrusions shall be inspected by the quality inspection department according to the extrusion drawings and this standard. Extrusion parts should be accompanied by a quality certificate when leaving the factory, indicating: a.
Name of the production unit;
Extrusion part drawing number and name;
Material:
Quantity:
Inspection items and results.
Additional instructions:
This standard was proposed and managed by the Tianshui Rock Drilling Machinery and Pneumatic Tools Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Shenyang Pneumatic Tools Factory. The main drafter of this standard is Gao Lijuan.
From the date of implementation of this standard, JB/SQ56-88 "General Technical Conditions for Cold Extrusion Parts of Rock Drilling Machinery and Pneumatic Tools" will be invalid.
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