Analysis of sheet metal processing technology

Technical requirements for sheet metal drawings Sheet metal processing

Generally, the technical requirements are “S’X0 R / P% Y”

• 1. Unmarked tolerance requirements IT01, IT0, IT1, IT2 to IT18
• 2. Details of some requirements (eg sanding)
• 3. Do I need 0 M $ r * D6 for surface treatment? And |. ] 3 {& h + w} r
• 4. If there is welding, the weld bead must be processed.

Technical requirements for sheet metal

Table of Contents

• Technical requirements for sheet metal

Material ** (You must specify the name and specification of the material, some require the creation of a national standard code).

Material thickness and quality should comply with national standards. The material used should show a performance test report and manufacturer’s certificate.

Material appearance: Smooth, rust-free, no cracks or deformation.

Part size: According to drawings and national standards, the important size is zero defects.

Performance: Test components and performance meet product requirements.

• 1. Parts remove oxides.
• 2. The surface of the part must not be damaged by scratches, scratches or other defects.
• 3. Remove burrs.
• 4. After adjustment, 28HRC to 32HRC.
• 5. Parts are induction hardened at 350-370 ° C, 40HRC-45HRC.
• 6. The carburizing depth is 0.3mm.7. Performs high temperature aging treatment.
• 8. Note that tolerances should not be met according to GB1184-2000.
• 9. Unmarked dimensional tolerances are GB / T1804-m
• 10. Casting tolerance zone is symmetrical to the basic size composition of blank casting.
• 11. No injection radius R5.
• 12. Injection chamfer is not 2 x 45 °
• 13. Assemble the rolling bearings and heat the oil for the heat load. The oil temperature should not exceed 100 ° C.
• 14. After the gear assembly is complete, the tooth surface contact points and backlash must meet the requirements of GB10095 and GB11365.
• 15. When assembling the hydraulic system, seal packing or sealant can be used, but it must be prevented from entering the system.
• 18. Assembled parts and parts (including purchased parts) must be inspected by the inspection department before assembly.
• 19. For fasteners that require tightening torque, you must use a torque wrench to tighten to the specified tightening torque.
• 20. When assembling the taper pin, you need to check the color of the holes. The contact rate must not be greater than or equal to 60% of the mating length and must be evenly distributed.
• 21. Make sure that both sides of the flat key and the upper keyway are evenly contacted so that there are no gaps on the mating surfaces.
• 22. The number of tooth surfaces that the spline assembly contacts at the same time is 2/3 or more. The length and height contact length of the key teeth must be at least 50%.
• 23. If the flat key (or spline) is slidably mounted, the phase fitting is free to move and should not be loosened.
• 24. Excess adhesive should be removed after bonding.
• 25. Do not hook the outer ring of the bearing and the semi-circular holes in the open bearing housing and bearing cap.
• 35. The outer ring of the bearing should make good contact with the open bearing housing and the semi-circular hole in the bearing cap. When using color inspection, the bearing housing should be 120 ° symmetrical with respect to the centerline and the contact with the bearing cap should be 90 ° symmetrical with respect to the centerline. When using the filler gauge within the above range, the 0.03mm stopper must not be inserted in 1/3 of the outer ring width.
• 26. After assembling the outer ring of the bearing, it should be in uniform contact with the end face of the positioning bearing cap.
• 27. After installing rolling bearings, they must be manually rotated to be flexible and stable.
• 28. The connecting surface between the upper bearing bushing and the lower bearing bushing cannot be inspected and inserted tightly with a 0.05 mm filler gauge.
• 29. When fixing the bearing with the positioning pin, secure the bearing surface and the end face, and make the opening of the bearing hole flush with the end face. The hinges and drill pins should not be loose after entering the page state.
• 30. The bearing body of the spherical bearing and the bearing housing must be in uniform contact and must pass the color inspection. Contact information must be at least 70%.
• 31. If the surface of the alloy bearing lining is yellow, it cannot be used and there is no nucleation other than the contact angle at a specific contact angle. The nuclear area should not exceed 10% of the total area of ​​the non-contact area.
• 32. The reference end face and shoulder of the gear (worm gear) (or end face of the positioning sleeve) must be attached. Inspect with a 0.05 mm filler gauge and do not insert. The perpendicularity of the gear reference end face to the axis must also be guaranteed.
• 33. The contact surface between the gearbox and the cover should be in good contact.
• 34. Before assembling, inspect and remove any sharp corners, burrs or debris remaining on the part. Make sure that the seal is not scratched during installation.

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