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Technical requirements for two-dimensional drawings of plastic parts

Release date:Jun 01,2022 Source:Bole Pageviews:-
Plastic mold manufacturing standard requirements:
In order to improve the quality of molds, minimize complaints about mold quality problems, and hand over molds to customers' satisfaction, summarize and summarize common mold manufacturing problems, establish standards, and implement them as required.
1. for mold blanks smaller than 2020, skid pits shall be made between plates a and B; Prying pits shall be made between all formworks including ejector pin plates for mold blanks larger than 2020.
2. the die blank guide post guide sleeve shall be processed with exhaust groove to prevent the guide post guide sleeve from being damaged.
3. there shall be no sharp corners on the mold, which shall be chamfered. Unless otherwise specified.
4. the internal mold and mold parts shall not be welded without consent.
5. the periphery of the mold product must be provided with an exhaust slot at an appropriate position. Please refer to the mold design manual for the specification of the exhaust slot.
6. try to avoid using a grinder to polish on the mold. If it is necessary to use a grinder, you must use an oilstone to save light (especially the parting surface)
7. the surface treatment of the internal mold adhesive surface must be carried out in accordance with the BOM table or other officially notified technical requirements. The processing lines (wire cutting, milling machine, CNC gong machine, spark machine) on the non glue surface should also be lightened with oilstone.
8. all internal mold materials and mold embryo grade requirements must be purchased according to the order or the technical requirements officially confirmed during the design review. The material certificate must be provided. If it is a hard mold, the heat treatment report must be provided. All relevant certificates.
9. a waist round pit shall be machined on the bottom or side of the front and rear internal molds, inserts, row position, inclined top, straight top (push block), shovel chicken, etc. of all molds, and the material name and hardness shall be engraved.
10. important wear-resistant parts such as row position, pushing block, shovel chicken, pump nozzle, etc. must be nitrided and hardened.
11. the row position must be positioned. The positioning methods include slingshot, wave ball, HASCO (DME) standard line clamp, etc. the specific requirements shall be in accordance with the requirements of each project. The row position shall be provided with batten and wear-resistant plate. The batten and wear-resistant plate must be made of wear-resistant hard materials, and oil grooves need to be added.
12. the inclined guide post of travel position must be pressed tightly, and cannot rotate or loosen. The tail of the inclined guide post must be processed into a hemispherical or conical platform shape, which is conducive to ensuring the normal movement of the row position. If there are two or more inclined guide posts in the same row, the length, size and inclination of the inclined guide posts must be the same.
13. the inclined roof seat must be made of wear-resistant hard materials. The inclined top must be processed with oil grooves. The inclined top seat is generally hardened to hrc40-45 degrees with 2510 or Cr12. Because the inclined top seat is subjected to impact load, it cannot be too hard, otherwise it will break, and chamfer angle c at all right angles. Inclined top guide plate (bronze) is required. Do not weld.
14. light saving \400-600 is required for flow channel and glue inlet position.
15. corresponding identification codes shall be engraved on the thimble, cylinder, thimble, inclined thimble and thimble plate to facilitate installation. If the ejector pin position on the product is not horizontal, the ejector pin seat needs to be made into "d" type or positioned with anti rotation pin key.
16. the ejector pin adopts HASCO or DME standards, and the choice depends on the BOM table or other officially notified mold technical requirements.
17. when processing the groove of water transport rubber ring ("O" ring), a 0.25mm gap shall be reserved at one side. Generally, the rubber ring shall be pre pressed by 0.5~0.8mm If you don't pay attention to this, the rubber ring is easy to be damaged by pressing, resulting in water leakage.
18. the pump nozzle shall be nitrided, and the anti rotation pin shall be made. The nozzle radius must meet the drawing requirements. The nozzle has not been nitrided, and may have been bruised before mold walking.
19. the support head must be arranged for the mold of conventional structure, and the surfaces at both ends need to be ground flat. The small mold is pre pressed by 0.1mm, and the large mold is pre pressed by 0.1mm-0.15mm
20. the diameter of the locating ring must comply with the drawing, and the form and position of the top rod joint must comply with the drawing.
21. the specification of the water nozzle shall be in accordance with the BOM table or the confirmed mold drawing. The countersunk hole of the water nozzle must be processed and installed in accordance with the mold drawing. The drilling shall not be deviated, and the acute angle shall be chamfered.
22. ini, outI, in2, out2 must be marked for water transportation
23. all the words and marks printed on the mold must be neat and correct without distortion.
24. side lock (straight lock) shall be installed on four sides of the mold. If the side lock cannot be installed, the taper lock or taper lock shall be installed. The taper lock shall be installed horizontally.
25. all screws and mold accessories shall be standard parts first, and the screw head shall not be sawed off. The effective locking length of the screw must be sufficient, normally 1.5 or 2.
26. the hot nozzle trunking must be rounded to avoid scratching the wires.
27. install the hot nozzle ID card on the side of the die panel.
28. mold handover acceptance: it is required to cooperate with the mold engineer to pass the acceptance according to the "mold Checklist" before packaging and mold walking.
29. before mold removal, the water transported shall be tested for water pressure (above 100Pa). After the water transported is accepted, the water shall be blown clean with an air gun.

30. during the manufacturing process, the outer surface of the mold embryo shall be maintained to prevent rusting and scratching. Before mold packing, the inner mold needs to be sprayed with white / or colorless anti rust agent. All mold surfaces must be cleaned and then buttered.

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