CNC Knowledge: Complete collection of technical requirements for mechanical drawings

General technical requirements
1. Remove the parts scale.
2. There should be no defects such as scratches or scratches on the surface of the parts which damage the surface of the parts.
3. Remove the burrs of burrs.

Heat treatment requirements
1. After quality treatment and treatment, HRC50 ~ 55.
2. The parts are subject to high frequency extinction, tempered at 350 ~ 370 ℃ and HRC40 ~ 45.
3. The fuel depth is 0.3 mm.
4. Perform high temperature aging treatment.

Tolerance requirements
1. The form tolerances that are not noted must comply with the requirements of GB1184-80.
2. The eligible difference in length and dimensions is not included ± 0.5 mm.
3. The casting tolerance belt is symmetrical to the configuration of the basic dimension of the empty flow.

Angle of part
1. No rounded corner radius R5 is noted.
2. The chamfers are all 2 × 45 °.
3. Acute angle / sharp angle / sharp edges are blinked.

Assembly requirements
1. All seals must be soaked in oil before assembly.
2. When assembling the rolling holds, the oil temperature should not exceed 100 ℃.
3. Once the gear is assembled, contact spots and lateral gaps in the dental surface must comply with the provisions of GB10095 and GB11365.
4. The joint filling or the seal is authorized during the assembly of hydraulic systems, but must be prevented from entering the system.
5. All parts and components (including the parts purchased and outsourced parts) which have entered the assembly must have a certificate of conformity of the inspection service before being able to be assembled.
6. The parts must be cleaned and cleaned before assembly, and there should not be terrifying, flashes, oxide scales, rust, chips, oil stains, colors and dust.
7. Before assembly, the main correspondence sizes of parts and components, in particular the size of the correspondence of the interference and the related accuracy, must be examined.
8. Parts cannot be hit, hit, striped or rusty during the assembly process.
9. When tightening screws, bolts and nuts, it is strictly prohibited to hit or use inappropriate rotary tools and keys. The screws of screws, nuts, screws and bolt heads should not be damaged after tightening.
10. The ties that require tightening torque must be made with a torque key and tight according to the specified tightening torque.

11. When the same part is tight with several screws (bolts), each screw (bolt) must be crossed, symmetrical, progressive and uniformly tight.
12. When assembling the conical pin, the inspection of the colors must be carried out with the hole and the contact rate must not be less than 60% of the correspondence length and must be distributed evenly.
13. The two sides of the flat key and the keyboat on the tree must be in contact evenly, and there must be no gap in the adjustment surface.
14. The number of dental surfaces in contact with the assembly of SPLINE should not be less than 2/3, and the contact rate should not be less than 50% in the direction and height of the key teeth.
15. Once the flat key (or the spline) with slippery adjustment (or the spline), the accessories can move freely and there should not be any unequal constraint.
16. After the collage, remove the excess adhesive from the flow.
17. The semi-circular holes of the exterior ring of the bearing, the open rolling seat and the rolling cover should not be stuck.
18. The exterior ring of the bearing must have good contact with the semi-circular holes of the open bearing seat and the bearing cover. ° Symmetrical at the central line with the bearing cover. When checking with a feeper gauge in the beach above, a 0.03 mm Feeper gauge should not be stuffed in 1/3 of the width of the external ring.
19. Once the outside ring of the bearing is assembled, the end of the rolling cover must be in contact with the positioning end.
20. Once the bearing of the bearing has been installed, it must turn with your hands in a flexible and gentle way.

21. The joint surfaces of the upper and lower bearings must be closely attached to each other and use a 0.05 mm flower gauge to check that they cannot be entered.
22. When fixing the rolling shell with a positioning pin, Forez and exempt the spindle while ensuring that the face of the tile and the final surface are rinsed with the opening and fence surfaces and the Final bread of relevant rolling holes. The pin should not be loose after being inserted.
23. The rolling body of the spherical bearings must be in contact with the bearing seat uniformly.
24. The surface of the alloy bearing lining is not allowed to be used when in yellow. The contactless area.
25. The reference end of the gear (verse gear) must be equipped with the shoulder of the tree (or the final side of the positioning sleeve) and use a 0.05 flower gauge mm to verify that it will not enter. The perpendicularity requirements of the reference ends surface of the gear and the axis must be ensured.
26. The connection surface between the gearbox and the cover must be in good contact.
27. Check and strictly eliminate the acute angles, rings and foreign objects on the left during the treatment of parts before assembly. Make sure the seal is not scratched during loading.

COULLAY requirements
1. Cold spacers, cracks, withdrawal holes, penetration defects and severe defects (such as sub-cake, mechanical damage, etc.) are not authorized on the surface of the flow.
2. The molded parts must be cleaned and there should not be terrifying or flashes.
3. Words sunk and logos on the non -transformed surface of the casting must be clearly identifiable, and the position and the police must meet the drawing requirements.
4. The roughness of the surface not transmitted from the flow, the S sand r is not greater than 50 μm.
5. The molded parts must be removed from the offices, the flying thorns, etc. The residual quantity of rising water column on unprocessed surfaces must be flattened and polished to meet surface quality requirements.
6. The molding sand, the nucleus sand and the nucleus bones on the flow must be cleaned.
7. The molded parts have inclined parts and their dimensional tolerance belts must be placed symmetrically along the inclined.
8. Molded sand, nucleus sand, nucleus, succulent sand and sticky on the casting must be shoveled and crushed gently and cleaned.
9. Good and bad shapes, a bias of boss casting, etc. must be corrected to obtain a smooth transition and ensure the quality of appearance.
10. The wrinkles on the not transmitted surface of the molded parts, the depth is less than 2 mm and the spacing must be greater than 100 mm.
11. The unprocessed surfaces of the molded pieces of machine products must be slaughtered or processed in the drum to meet the requirements of SA2 level 1/2.
12. The molded parts must be treated with tenacity in water.
13. The surface of the flow must be flat and the doors, excavations, sticky sand, etc. should be cleaned.
14. Molded parts are not allowed to have molding defects such as cold partitions, cracks, holes, etc. which are damaged by use.

Painting requirements
1. Before painting the surface of all steel parts which must be painted, rust, scale, fat, dust, soil, salt and dirt must be eliminated.
2. Before eliminating rust, use organic solvents, alkaline liquids, emulsifiers, steam, etc. To remove fat and dirt on the surface of steel parts.
3. The time interval between the surface to be applied by a boost or the manual elimination of rust and the primer application must not exceed 6 hours.
4. The surfaces where the riveted parts come into contact with each other must be coated with anti-rust paint with a thickness of 30 to 40 μm before connecting. The edges of overlap are sealed with paint, putty or adhesive. The damaged primer due to treatment or welding should be repainted.

Piping requirements
1. All the pipes must be removed before assembly, flicker, excavations and chamfered at the ends. Use compressed air or other methods to understand the debris and rust attached to the inner wall of the tube.
2. Before assembly, all steel pipes (including prefabricated pipelines) must be degraded, marinated, neutralized, washed by water and anti-utters.
3. During the assembly, tighten the parts fixed with threaded connections, such as the hose clips, the support, the bridles and the joints to avoid relaxation.
4. Pressure tests must be carried out at the welding parts of the prefabricated pipe.
5. When replacing or transferring the pipe, the separation port of the pipe must be blocked and sealed with adhesive tape or plastic pipe to prevent any debris from entering and attached with a label.

Repair welding requirements
1. The faults must be completely removed before welding, the bevel surface must be smooth and smooth, and there should not be pointed corners.
2. According to the defects of the flowed steel parts, the defects in the welding area can be eliminated by pelletterie, grinding, carbon arc planing, gas cutting or mechanical treatment.
3. The welded area and the surrounding slopes of sand, oil, water, rust and other dirt should be carefully cleaned.
4. Throughout the welding process, the temperature of the preheating area for cast steel parts should not be less than 350 ° C.
5. If the conditions allow, apply welding to a horizontal position as much as possible.
6. During the redesign, the welding rod should not swing too horizontally.
7. When welding on the surface of the flowed steel parts, the overlap between the pearls should not be less than 1/3 of the width of the pearls. The welding flesh is full and there are no burns, cracks or obvious nodules on the welding surface. The welding has a good appearance and no faults such as the morve, the slag, the pores, the cracks, the splashes, etc.;

Forge requirements
1. The exit of the water and the rising column of the Lingot should have a sufficient cut to ensure that the parts are not narrowing holes and severe deviations.
2. The forged parts must be forged on a forging press with sufficient capacity to ensure that the interior of the forging is completely forged and in -depth.
3. Forged parts are not allowed to have cracks, folds and other appearance defects that affect the use that is visible to the naked eye. Local defects can be removed, but the cleaning depth should not exceed 75% of the treatment allowance.
4. White spots, internal cracks and residual narrowing holes are not allowed for forged parts.

Cutting parts requirements
1. The parts must be inspected and accepted according to the process, and can only be transferred to the following process after the inspection and the passage of the previous process.
2. No burrs is authorized for the treatment of parts.
3. The finished parts should not be placed directly on the ground when they place them, and the necessary support and protection measures must be taken. The treatment surface is not allowed to have rust and defects such as bumps and scratches that affect performance, life or appearance.
4. The surface of the rolling finish should not peel after the bearing.
5. The surface of the parts after heat treatment in the final process should not have an oxide scale. Finished mating surfaces and dental surfaces should not be recovered
6. The surface of the transformed thread does not allow defects such as black skin, bumps, random loops and executioners.