JB/T 9168.1-1998 General principles for general process codes for cutting
Some standard content:
Ks 25.020
Machinery Industry Standard of the People's Republic of China
JB/T9168.1~9168.13-1998
Common process Instructions for cutting
Common process Instructions for cutting1998-11·16Published
National Machinery Industry Standard
199812-01Implementation
Machinery Industry Standard of the People's Republic of China
Common process instructions for culling-General
Coanmon processg instructlons for culling-GeneralJB/T 0168.1-1998
[March 3.1--
This standard stipulates the basic rules for various cutting processes to be followed. It is applicable to the cutting processes of various enterprises. 2. Referenced standards
The texts contained in the listed standards constitute the referenced texts of this standard through reference in this standard. The versions shown are valid at the time of publication of this standard. All standard parts will be used. When using the public standard, the latest versions of the following standards may be used. 2B136011937 General
3 Preparation before processing
3.1 After the work is completed, the first thing to do is to check whether the product drawings, process specifications and related technical materials are complete. 3.2 The company must clearly state the "process specifications" and the product details and its technical requirements. If there are any inquiries, the relevant technical personnel should be contacted to complete the processing. 3.3 According to the product requirements or (process specifications) the workpiece is connected to the semi-finished product to ensure that it meets the requirements. If the relevant personnel and time are found, the processing method can be reversed. 1..
3 .4 The enterprise should prepare the necessary process equipment for the work in accordance with the regulations, and deal with the problems in time. For new fire only, nuclear only, etc., the emergency method should be used first.
51. Use the contract! The equipment should be placed in the current position, and the card collection can be changed in the machine tool guide [3.61. The requirements should not be followed and modified
3. The same machine requirements should be added to the equipment, and the accessories should be taken care of before the service. Note the flat connection regulations and the extension of the production line and the empty rotation of the tool and the work.
41. When the environment is changed
4, 1.1 Before using the double-light tool, be sure to clean the tool handle, tool opening, guide, etc. 4.1.2 Double-light and table, pay attention to the use of some tools or test objects to check the door research 4.2 The difference between the above parts
42.1 When the machine tool is installed, the first light must be connected to the positioning base and the positioning base must be correct. 4, 2.2 ". Before installing the parts, the fixed surface must be straightened, and there must be no gaps and gaps. The light case must be clean and there must be no hair. 4.2.3 Install the positioning reference table specified in the regulations. If the work is out of order, The following principles should be followed when selecting the positioning datum: The positioning datum should be written as close as possible to the design base) so that each time can be positioned: The positioning datum should be selected as soon as possible without processing or with a smaller range of flat drawing, and can only be used for one piece -.; The positioning datum should be processed by hand) The positioning efficiency should be constant, and the positioning clamping should be convenient, and the planning time should be stable. The National Machinery Industry approved it in 19816 and implemented it in 1812. IB/T 9168.1-1998
4.2.4 For workpieces without special tools, the following principles should be followed for alignment during assembly: a) For workpieces with markings, alignment should be carried out according to the markings: b) For workpieces without markings, the surface that needs to be processed after the process should be aligned with the precision sensor to ensure that there is enough margin for the lower I-shaped part. For surfaces processed to the finished product size in the process, the alignment tolerance should be one-third of the minimum size tolerance and position tolerance. For the surface processed to the finished product size in this process, the alignment tolerance should be one-third of the minimum size tolerance and position tolerance. The projection accuracy of the surface should meet the requirements of ZBJ38 for the undeveloped dimensional tolerance and placement tolerance. 4.2.5 When clamping the joint parts, it is necessary to check the positioning of the joint. 4.2.6 When tightening the workpiece, the point of action of the tightening force should pass through the vertical point of the text to form a support surface. For the poor rigidity (or the rigidity of the hollow part of the machining), the appropriate distance should be added to increase the auxiliary support to enhance its rigidity. 4.2.7 When fine machining the surface and soft material workpiece, it should be padded with a pad, such as steel sheet. 4.2.8 When using a pressure plate to press the limit parts, the support point of the pressure plate should be far away from the surface of the workpiece, and the seat should be measured as much as possible to verify the tension.
5 Processing requirements
5.! In order to ensure the quality of processing and improve the productivity, the cutting depth should be reasonably selected according to the material science, precision requirements and machine tools, fixtures, and other conditions: when cutting parts, in order to avoid surface sand, hardened layer and other damage to the tool, the depth before cutting should be greater than the depth of the old corrosion layer.
5.2 For small sizes with tolerance requirements, the intermediate difference E.5.3 In the roughing process specified in the process specification for the surface roughness requirements, the surface roughness of the processed piece shall not be less than 25um5.4 The surface roughness R before hole should not be greater than 12.5um:5.5 The surface roughness R before grinding should not be greater than 6.3am5. When adding, the depth of the surface should be deepened according to the finishing allowance to ensure that the finished piece meets the design requirements. Figure S.7 shows the example of the size and tolerance requirements that are not in the process specification. The requirements should be in accordance with the provisions of ZBJGC1. SS If the next process needs to be re-produced, the T-piece surface that is over-produced will be rolled and processed quickly. The surface roughness of the T-piece processed in the standard T sequence will be 16.3m
5.9 If there is no fly process after this process, the roughness of the next process should be removed in this process. 5.10 During the processing of large parts, the main parts should be checked for looseness to prevent the quality of the processing or accidental machining. When roughing and finishing are carried out on the same machine tool, the parts should be re-assembled after being cut. 5.1Www.bzxZ.net
5.12 During the cutting process, the machine tool will produce a torque that does not show the torque of the workpiece. The torque is deteriorated.
5.13 In batch production, the workpiece must be checked before it can be processed. 5.14 During the processing, the workpiece must be checked frequently. 5.15 When checking, the measuring instruments should be used correctly. When using gauges, micrometers, etc., they must be used gently or with a small force. When using calipers, micrometers, dial indicators, and work scales, the position should be adjusted in advance. 6 Post-processing treatment
6.1 After each process, the workpiece should be cleaned of dust, water, and solid, and placed on the specified workstation to avoid contact, collision, etc.
6.2 The surface after finishing processing should not be processed for the next process, but should be processed. 3 months inspection of the light of its absorption of the work partner, the added film should be returned, 4 orange zero component assembly processing, processing after false mark (or editing), 6.5 valley sequence light of the full-time inspector to check the qualified transport deflection - road hall. Other requirements
JE/T 9168.1-1998
1 process equipment used film to wipe clean (clean to prevent the situation), put it in the designated position or return it to the warehouse. 2 strict drawings, 1 art specifications and other technical documents used, pay attention to keep clean, strictly prohibited to modify.
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