1、 Mold appearance

1. The content of the mold nameplate is complete, the characters are clear, and the arrangement is neat.

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

3. The cooling water nozzle should be made of plastic blocks inserted into the nozzle. If there are other requirements from the customer, they should be used according to the requirements.

4. The cooling water nozzle should not protrude from the surface of the mold base.

5. The cooling water nozzle needs to be processed and sunk. The diameter of the sunk hole is 25mm, 30mm, and 35mm, and the chamfer of the orifice should be consistent.

6. Cooling water nozzles should have inlet and outlet markings.

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

8. The mold accessories should not affect the lifting and storage of the mold. There are exposed oil cylinders, water nozzles, pre reset mechanisms, etc. below during installation, and there should be support leg protection.

9. The installation of the support legs should be fixed on the mold base with screws passing through the support legs. Long support legs can be machined with external threaded columns and fastened on the mold base.

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

11. The positioning ring should be fixed and reliable, with diameters of 100mm and 250mm, and the positioning ring should be 10-20mm higher than the bottom plate.

12. The overall dimensions of the mold should meet the requirements of the designated injection molding machine.

13. For molds with directional requirements for installation, the installation direction should be marked with an arrow on the front or rear template, with the word "UP" next to the arrow. The arrow and text should be yellow, with a height of 50mm

14. The surface of the mold base should be free of pits, rust, excess lifting rings, inlet and outlet water vapor, oil holes, and defects that affect the appearance.

15. The mold should be easy to lift and transport, and mold components should not be disassembled during installation. The lifting ring should not interfere with the water nozzle, oil cylinder, pre reset rod, etc.

2、 Mold material and hardness

1. The mold base should be a standard mold base that meets the standards.

2. The materials used for the mold forming parts and pouring system (core, movable and fixed mold insert, movable insert, diversion cone, push rod, and gate sleeve) are materials with strange energy higher than 40Cr.

3.When forming plastic that is prone to corrosion on the mold, the formed parts should be made of corrosion-resistant materials, or the formed surface should be taken with anti-corrosion measures.

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

3、 Ejection, reset, core insertion and removal

1. The ejection should be smooth, without jamming or abnormal sound.

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

3. Sliding components should be equipped with oil grooves, and the surface should undergo nitriding treatment. After treatment, the surface hardness should be above H/700.

4. All top rods should have stop rotation positioning, and each top rod should be numbered.

5. The ejection distance should be limited by a limit block

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

7 sliding blocks and core pulling should have travel limits, while small sliding blocks should be limited by springs. When the spring is inconvenient to install, wave screws can be used; The oil cylinder core extraction must have a stroke switch.

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

9. When the end face of the core pulling forming part of the oil cylinder is covered, a self-locking mechanism should be added to the oil cylinder.

10. There should be a wear-resistant plate below the large sliding block with a width exceeding 150mm. The wear-resistant plate material should be T8A, with a hardness of HRC50~55 after heat treatment. The wear-resistant plate should be 0.5 * 0.1mm higher than the large surface, and an oil groove should be opened.

11. The top rod should not move up or down in series.

12. Add a barb to the top bar, and the direction of the barb should be consistent, making it easy to remove the barb from the product.

13. The fit clearance between the top rod hole and the top rod, the length of the sealing section, and the surface roughness of the top rod hole should comply with relevant enterprise standards.

14. The product should be easy for operators to remove.

15. When the product is ejected, it is easy to follow the inclined top, and grooves or corrosion marks should be added to the top rod.

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

17. The oil passage holes on the mold base should be free of iron filings and debris.

18. The end face of the return rod is flat and free from spot welding. There is no gasket at the bottom of the embryo head, and spot welding is required.

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

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

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

22. Air ports should be opened at the bottom of the guide sleeve.

23. There should be no gap in the installation of the positioning pin.

4、 Cooling and heating systems

1. The cooling or heating system should be fully unobstructed.

2. The sealing should be reliable, and the system should not have leakage under a pressure of 0.5MPa, making it easy to maintain.

3. The size and shape of the sealing groove set on the mold base should comply with relevant standard requirements.

4. When placing the sealing ring, butter should be applied and it should be placed higher than the surface of the mold base.

5. The water and oil flow passage spacers should be made of materials that are not easily corroded.

6. The front and rear molds should adopt a centralized water supply method.

5、 Pouring system

1. The gate setting should not affect the appearance of the product and meet the requirements of product assembly.

2. The cross-section and length of the flow channel should be designed reasonably, and the process should be shortened as much as possible while ensuring the forming quality. The cross-sectional area should be reduced to shorten the filling and cooling time, and the plastic loss in the pouring system should be minimized.

3. The section of the three plate mold runner on the back of the front template should be trapezoidal or semi circular.

4. The three plate mold has a broken material holder on the gate plate, and the diameter of the gate entrance should be less than 3mm. There is a 3mm step concave into the pouring white plate at the ball head.

5. The ball head pulling sample should be reliably fixed and can be pressed under the positioning ring. It can be fixed with headless screws or pressed with a pressure plate.

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

7. The point gate should be located according to the specifications.

8. The front end of the diversion channel should have an extended section as a cold material cavity.

9. The B-shaped buckle of the pulling rod should have a smooth transition.

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

11. The latent pouring on the top material rod should have no surface shrinkage.

12. The diameter and depth of the cold material hole in transparent products should comply with the design standards.

13. The material handle is easy to remove, and there are no gate marks on the appearance of the product. There are no residual material handles at the assembly site of the product.

14. The latent gate with curved hooks and two parts of the insert should be nitrided and have a surface hardness of HV700.

6、 Hot runner system

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

2. The hot runner should undergo safety testing, with an insulation resistance to ground greater than 2MW.

3. The temperature control cabinet, hot nozzle, and hot runner should be standard components.

4. The mainstream mouth sleeve is connected to the hot runner with threads, and the bottom surface is sealed in contact with the flat surface.

5. The hot runner has good contact with the heating plate or heating rod, and the heating plate is fixed with screws or studs, with a good surface adhesion.

6. J-type thermocouples should be used and matched with temperature control meters.

7. Each set of heating elements should be controlled by thermocouples, and the thermocouple positions should be arranged reasonably.

8. The nozzle should meet the design requirements.

9. The hot runner should be reliably positioned, with at least two positioning pins or fixed with screws.

10. There should be an insulation pad between the hot runner and the template.

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

12. The cavity and nozzle installation hole should be penetrated.

13. The hot runner wiring should be bundled and covered with a pressure plate.

14. There should be clear markings for two sockets of the same specification.

15. The production line should have a protective sheath without damage.

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

17. The socket should be installed on a bakelite board and should not exceed the maximum size of the template.

18. The wires are not allowed to be exposed outside the mold.

19. All areas where the hot runner or template comes into contact with the wires should have rounded transitions.

20. Before the template assembly, all lines should have no open circuit or short circuit phenomenon.

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

22.After clamping the template, all circuits should be rechecked with a multimeter.

7、 Forming part, parting surface, exhaust groove

1. The surface of the front and rear molds should not have any unevenness, pits, rust or other defects that affect the appearance.

2. The insert should fit with the mold frame, and there should be a gap of less than 1mm around the rounded corners.

3. The parting pass should be kept clean and tidy, without any portable grinding wheel grinding to avoid voids, and the sealing part compartment should be free from dents.

4. The depth of the exhaust groove should be less than the overflow value of the plastic.

5. The embedded parts should be in place, placed smoothly, and positioned reliably.

6. The inlay block, core, etc. should be reliably positioned and fixed, and the circular parts should have a stop rotation. There should be no copper or iron sheets placed below the inlay block.

7. The end face of the top rod is consistent with the core.

8. There are no defects such as undercuts or chamfers in the formed parts of the front and rear molds.

9. The reinforcement should be pushed out smoothly

10. For products with multi cavity molds, the left and right parts should be symmetrical and marked with L or R. If the customer has requirements for position and size, they should meet the customer's requirements. Generally, they should be added in a place that does not affect the appearance and assembly, with a font size of 1/8.

11. The locking surface of the mold base should be properly matched, with 75% of the contact area.

12. The top rod should be arranged near the side wall and beside the ribs and bosses

Edge and use a larger top bar.

13. For identical parts, numbers 1, 2, 3, etc. should be indicated.

14. Each collision surface, insertion surface, and parting surface should be properly matched.

15. The sealing part of the parting surface should comply with the design standards. Medium and below molds are 10-20mm, large molds are 30-50mm, and the remaining parts are machined to avoid voids.

16. The skin texture and sandblasting should be uniform and meet customer requirements.

17. For products with appearance requirements, the screws on the products should have anti shrinkage measures.

18. For screw columns with a depth exceeding 20mm, top pipes should be used.

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

20. The width of the reinforcement should be less than 60% of the exterior wall thickness

21. The inlay core on the inclined top and slider should have a reliable fixing method.

22. Insert the front mold into the back mold or insert the back mold into the front mold, with inclined locking around and machining to avoid voids.

8、 Injection molding production process

1. The mold should have the stability of legal plastic production and the repeatability of process parameter adjustment within the normal injection molding process conditions.

2. The injection pressure during mold injection production should generally be less than 85% of the rated maximum injection pressure of the injection molding machine.

3. The injection speed during mold injection production shall not be less than 10% of the rated maximum injection speed or exceed 90% of the rated maximum injection speed for three-quarters of the stroke.

4. The holding pressure during mold injection production should generally be less than 85% of the actual maximum injection pressure.

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

During the injection molding production process, the removal of products and nozzle materials should be easy and safe (usually no more than 2 seconds each).

7. For molds with insert products, the installation of inserts should be convenient and the fixation of inserts should be reliable during production.

9、 Packaging and transportation

1. The mold cavity should be cleaned and sprayed with anti rust oil.

2. Sliding components should be coated with lubricating oil.

3. The feeding port of the gate sleeve should be sealed with lubricating grease.

4. The mold should be equipped with locking plates, and the specifications should meet the design requirements.

5. Spare parts and vulnerable parts should be complete and accompanied by a detailed list and supplier name.

6. The inlet and outlet of mold water, liquid, gas, and electricity should be sealed to prevent foreign objects from entering.

7. Spray paint on the surface of the carbon canister, if requested by the customer.

8. The mold should be packaged with moisture-proof, waterproof, and collision resistant packaging. If customers have requirements, they should follow the requirements.

9. Mold product drawings, structural drawings, cooling and heating system drawings, hot runner drawings, spare parts and mold material supplier details, user manuals, mold test reports, factory inspection certificates, and electronic documents should be complete.