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It is not only necessary to have a set of high-precision mold design and manufacturing level, but also to have a set of precision mold. What is the concept of precision mold development? Many people don't think so. They think they have made so many molds. How can there be no precision concept? In fact, the mold does not depend on how much you do, but on whether your mold development pursues the excellence of details and reliable standards. This process will never allow the existence of the concept of "almost".

Mold appearance

1. The contents of the die nameplate are complete, the characters are clear and arranged neatly.

2. The nameplate shall be fixed on the mold foot near the formwork and reference angle. The nameplate shall be fixed reliably and not easy to peel off.

3. The cooling water nozzle shall be plastic block water nozzle. If the customer has other requirements, it shall be in accordance with the requirements.

4. The cooling water nozzle shall not extend beyond the surface of the mold base.

5. The cooling water nozzle needs to be processed with counterbore. The counterbore diameter is 25mm, 30mm and 35mm. The orifice chamfer and chamfer shall be consistent.

6. The cooling water nozzle shall be marked with inlet and outlet.

7. The English characters and numbers marked shall be greater than 5 / 6, located at 10mm below the water nozzle, and the handwriting shall be clear, beautiful, neat and evenly spaced.

8. Mold accessories shall not affect the hoisting and storage of molds. During installation, there are exposed oil cylinders, water nozzles, pre reset mechanisms, etc. under them, which shall be protected by support legs.

9. The support leg shall be installed and fixed on the mold base with screws passing through the support leg. The excessively long support leg can be processed with a vehicle, and the external thread column can be fastened on the mold base.

10. The size of the ejection hole of the mold shall meet the requirements of the designated injection molding machine. Except for small molds, only one center cannot be ejected.

11. The locating ring shall be fixed reliably. The diameter of the ring is 100mm and 250mm. The locating ring is 10 ~ 20mm higher than the bottom plate. Unless otherwise required by the customer.

12. The overall dimension of the mold shall meet the requirements of the designated injection molding machine.

13. For molds with direction requirements, the installation direction shall be marked with an arrow on the front formwork or rear formwork, and there shall be the word "up" next to the arrow. The arrow and text are yellow, and the word height is 50 mm.

14. The surface of the formwork shall be free of pits, rust, excess lifting rings, inlet and outlet water vapor, oil holes and other defects affecting the appearance.

15. The mold shall be convenient for hoisting and transportation. During hoisting, the mold parts shall not be disassembled, and the lifting ring shall not interfere with the water nozzle, oil cylinder, pre reset rod, etc.

Two. Die material and hardness

1. The mold base shall be the standard mold base that meets the standard.

2. Mold forming parts and gating system (core, dynamic and fixed mold insert, movable insert, shunt cone, push rod and gate sleeve) shall be made of materials with performance higher than 40Cr.

3. When forming plastic that is easy to corrode the mold, the formed parts shall be made of corrosion-resistant materials, or the formed surface shall take anti-corrosion measures.

4. The hardness of molded parts shall not be lower than 50HRC, or the hardness of surface hardening treatment shall be higher than 600hv.

3、 Ejection, reset, core pulling and inserting, parts taking

1. The ejection shall be smooth without jamming and abnormal sound.

2. The inclined top surface shall be polished, and the inclined top surface shall be lower than the core surface.

The surface hardness of sliding parts shall be more than hv700 after nitriding treatment.

4. All jacking rods shall be provided with anti rotation positioning, and each jacking rod shall be numbered.

5. The ejection distance shall be limited by the limit block

6. The return spring shall be standard parts, and both ends of the spring shall not be polished or cut.

7. The sliding block and core pulling shall have stroke limit, and the small sliding block shall be limited by spring. When the spring is inconvenient to install, the wave screw can be used; The cylinder core pulling must have a travel switch.

8. The sliding block core pulling generally adopts the inclined guide column, and the angle of the inclined guide column shall be 2 ° ~ 3 ° smaller than the angle of the locking surface of the sliding block. If the stroke of the slider is too long, it shall be pulled out by oil cylinder.

9. When the end face of the core pulling forming part of the oil cylinder is covered, the oil cylinder shall be equipped with a self-locking mechanism.

10. There shall be wear-resistant plate under the large sliding block with the sliding block width of more than 150 mm. The wear-resistant plate material shall be T8A. After heat treatment, the hardness is HRC50 ~ 55. The wear-resistant plate is 0.05 ~ 0.1 mm higher than the large surface, and an oil groove shall be opened.

11. The ejector rod shall not move up and down in series.

12. A barb shall be added to the ejector rod. The direction of the barb shall be consistent, and the barb is easy to be removed from the product.

13. The fit gap between the ejector rod hole and the ejector rod, the length of the sealing section, and the surface roughness of the ejector rod hole shall meet the requirements of relevant enterprise standards.

14. The products shall be easy for the operator to remove.

15. When the products are ejected, they are easy to follow the inclined top, and the top rod shall be grooved or etched.

16. The top block fixed on the top rod shall be firm and reliable, the surrounding non formed parts shall be processed with a slope of 3 ° ~ 5 °, and the lower periphery shall be chamfered.

17. There shall be no iron filings and sundries in the oil passage hole on the mold base.

18. The end face of the return rod is flat without spot welding. There is no gasket at the bottom of the embryo head and spot welding is required.

19. The guide of the three plate mold gate plate slides smoothly, and the gate plate is easy to open.

20. The three plate mold limit pull rod shall be arranged on both sides of the mold installation direction, or a pull plate shall be added to the mold base to prevent the interference between the limit pull rod and the operator.

21. The oil passage and air passage shall be smooth, and the hydraulic ejection reset shall be in place.

22. The bottom of the guide sleeve shall be provided with an exhaust port.

23. There shall be no clearance during the installation of locating pin.

4、 Cooling and heating system

1. The cooling or heating system shall be fully unblocked.

2. The sealing shall be reliable, and the system shall be free of leakage under the pressure of 0.5MPa, which is easy for maintenance.

3. The size and shape of the sealing groove set on the mold base shall meet the requirements of relevant standards.

4. The sealing ring shall be applied with butter when placed, and shall be higher than the mold base surface after placement.

5. The spacer of water and oil flow passage shall be made of materials that are not easy to be corroded.

6. The front and rear formwork shall adopt the mode of centralized water supply and.

5、 Gating system

1. The gate setting shall not affect the product appearance and meet the product assembly.

2. The cross section and length of the runner shall be designed reasonably. On the premise of ensuring the forming quality, the process shall be shortened as far as possible, and the cross-sectional area shall be reduced to shorten the filling and cooling time. At the same time, the plastic loss of the gating system shall be minimized.

3. The partial section of the three plate mold runner on the back of the front formwork shall be trapezoidal or semicircular.

4. The three plate mold has a cutting handle on the gate plate, the diameter of the gate inlet should be less than 3mm, and there is a 3mm deep step recessed into the gate plate at the ball head.

5. The ball head pull rod shall be reliably fixed and can be pressed under the locating ring. It can be fixed with headless screws or pressed with a pressing plate.

6. The gate and runner shall be machined according to the size requirements of the drawing, and manual polishing machine is not allowed.

7. The point gate shall meet the specification requirements.

8. There shall be an extension at the front end of the diversion channel as a cold material cavity.

9. The Z-shaped reverse buckle of the pull rod shall have a smooth transition.

10. The diversion channel on the parting surface shall be circular, and the front and rear molds shall not be misaligned.

11. The latent gate on the ejector rod shall have no surface shrinkage.

12. The diameter and depth of the cold cavity of transparent products shall meet the design standards.

13. The material handle is easy to remove, the product appearance has no gate trace, and there is no residual material handle at the product assembly.

14. For the curved hook latent gate, the two-part inserts shall be nitrided, and the surface hardness shall reach hv700.

6、 Hot runner system

1. The wiring layout of hot runner shall be reasonable and convenient for maintenance, and the wiring numbers shall correspond one by one.

2. The hot runner shall be subject to safety test, and the insulation resistance to ground shall be greater than 2MW.

3. Temperature control cabinet, thermal nozzle and hot runner shall adopt standard parts.

4. The main flow sleeve is connected with the hot runner with threads, and the bottom plane is in contact and sealed.

5. The hot runner is in good contact with the heating plate or heating rod. The heating plate is fixed with screws or studs, and the surface fits well.

6. J-type thermocouple shall be adopted and matched with temperature control meter.

7. Each group of heating elements shall be controlled by thermocouples, and the location of thermocouples shall be arranged reasonably.

8. The nozzle shall meet the design requirements.

9. the hot runner shall be reliably positioned with at least two locating pins or fixed with screws.

10. There shall be a thermal insulation pad between the hot runner and the formwork.

11. The error between the set temperature of the temperature control meter and the actual displayed temperature shall be less than ± 5 ° C, and the temperature control shall be sensitive.

12. The cavity and nozzle mounting hole shall be penetrated.

13. Hot runner wiring shall be bundled and covered with pressing plate.

14. There are two sockets of the same specification, which shall be clearly marked.

15. The control line shall be sheathed without damage.

16. The structure of the temperature control cabinet is reliable and the screws are not loose.

17. The socket shall be installed on the bakelite board and shall not exceed the size of the prohibited words of the template.

18. wires shall not be exposed outside the mold.

19. All parts of hot runner or formwork in contact with wires shall have fillet transition.

20. Before formwork assembly, all lines shall be free of open circuit and short circuit.

21. All wiring shall be correctly connected and have good insulation performance.

22. After the formwork is installed and clamped, all lines shall be checked again with a multimeter.

7、 Forming part, parting surface and exhaust slot

1. The front and rear mold surfaces shall be free of irregularities, pits, rust and other defects affecting the appearance.

2. The insert shall be matched with the die frame, and there shall be a gap of less than 1 mm around the fillet.

3. The parting surface shall be kept clean and tidy, there shall be no hand-held grinding wheel to avoid empty, and there shall be no depression in the sealing part.

4. The depth of exhaust slot shall be less than the overflow value of plastic.

5. The research and matching of inserts shall be in place, placed smoothly and positioned reliably.

6. The insert block and core shall be reliably positioned and fixed, the circular parts shall have rotation stop, and there shall be no copper or iron under the insert block.

7. the end face of ejector rod is consistent with the core.

8. The forming part of the front and rear molds shall be free of defects such as reverse buckle and chamfer.

9. The reinforcement shall be ejected smoothly

10. For the products of multi cavity mold, the left and right parts are symmetrical and shall be marked with L or R. if the customer has requirements for position and size, it shall meet the customer's requirements. Generally, it is added where it does not affect the appearance and assembly, and the font size is 1 / 8.

11. The clamping surface of the mold base shall be grinded and matched in place, and more than 75% of the area shall be touched.

12. The jacking rod shall be arranged near the side wall and next to the reinforcement and boss, and a larger jacking rod shall be used.

13. The same parts shall be marked with numbers 1, 2, 3, etc.

14. Each contact surface, insertion surface and parting surface shall be grinded and matched in place.

15. The sealing part of parting surface shall meet the design standard. 10 ~ 20mm for medium-sized molds and 30 ~ 50mm for large molds, and the rest shall be machined to avoid air.

16. The skin texture and sand blasting shall be uniform and meet the customer's requirements.

17. For products with appearance requirements, the screws on the products shall be provided with anti shrinkage measures.

18. Pipe jacking shall be selected for screw columns with a depth of more than 20 mm.

19. The wall thickness of the product shall be uniform, and the deviation shall be controlled below ± 0.15 mm.

20. The width of reinforcement shall be less than 60% of the wall thickness of the appearance surface

21. The insert on the inclined roof and sliding block shall be fixed reliably.

22. When the front mold is inserted into the rear mold or the rear mold is inserted into the front mold, there shall be inclined planes around to lock and machine to avoid empty.

8、 Injection molding process

1. Within the range of normal injection molding process conditions, the mold shall have the stability of injection molding production and the repeatability of process parameter adjustment.

2. During mold injection production, the injection pressure shall generally be less than 85% of the rated injection pressure of the injection molding machine.

3. For the injection speed during mold injection production, the injection speed of three-quarters of the stroke shall not be less than 10% of the rated forbidden word injection speed or more than 90% of the rated forbidden word injection speed.

4. The pressure holding pressure during mold injection production shall generally be less than 85% of the actual prohibited word injection pressure.

5. The clamping force during mold injection production shall be less than 90% of the rated clamping force of the applicable model.

6. In the process of injection molding production, the product and nozzle material shall be taken out easily and safely (generally, the time shall not exceed 2 seconds).

7. For molds with inserts, the inserts shall be installed conveniently and fixed reliably during production.

9、 Packaging and transportation

1. The mold cavity shall be cleaned and sprayed with antirust oil.

2. The sliding parts shall be coated with lubricating oil.

3. Apply grease to plug the gate.

4. The die shall be equipped with die locking plate, and the specification shall meet the design requirements.

5. The spare parts and vulnerable parts shall be complete, with detailed list and supplier name attached.

6. The water, liquid, gas and electricity inlets and outlets of the mold shall be sealed to prevent foreign matters from entering.

7. Paint shall be sprayed on the outer surface of the mold. If the customer has requirements, it shall be in accordance with the requirements.

8. The mould shall be packaged with moisture-proof, waterproof and collision proof packaging. If the customer has requirements, it shall be in accordance with the requirements.

9. Mold product drawings, structural drawings, cooling and heating system drawings, hot runner drawings, spare parts and mold material supplier details, operation instructions, mold test report, factory inspection certificate and electronic documents shall be complete.