Mold appearance

1. The mold nameplate has complete content, clear characters and neat arrangement.

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

3. The cooling water nozzle should use a plastic block water nozzle. If the customer has other requirements, please follow 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 with counterbore. The diameter of the counterbore is 25mm, 30mm and 35mm. The hole opening should be chamfered and the chamfering should be consistent.

6. The cooling water nozzle should have entrance and exit marks.

7. The marked English characters and numbers should be larger than 5/6 and located 10mm directly below the faucet. The writing should be clear, beautiful, neat, and evenly spaced.

8. Mold accessories should not affect the lifting and storage of the mold. During installation, if there are exposed oil cylinders, water nozzles, pre-reset mechanisms, etc. below, they should be protected by supporting legs.

9. To install the support legs, screws should be passed through the support legs to fix them on the formwork. If the support legs are too long, they can be fastened to the formwork with machined externally threaded pillars.

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

11. The positioning ring should be fixed and reliable. The diameter of the ring is 100mm and 250mm. The positioning ring should be 10~20mm higher than the bottom plate. Unless otherwise requested by the customer.

12. The external dimensions of the mold should comply with the requirements of the designated injection molding machine.

13. When installing molds with directional requirements, the installation direction should be marked with an arrow on the front or rear template. There should be the word "UP" next to the arrow. The arrow and text are both yellow, and the height of the word is 50 mm.

14. There should be no pits, rust, excess lifting rings, water vapor in and out, oil holes, etc. on the surface of the mold base, as well as defects that affect the appearance.

15. The mold should be easy to hoist and transport. Mold parts must not be disassembled during hoisting. The lifting rings must not interfere with faucets, oil cylinders, pre-reset rods, etc.

Mold material and hardness

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

2. The mold forming parts and pouring system (core, movable and fixed mold inserts, movable inserts, diverter cone, push rod, gate sleeve) are made of materials with properties higher than 40Cr.

3. When molding plastics that are easily corrosive to the mold, the molded parts should be made of corrosion-resistant materials, or the molding surface should take anti-corrosion measures.

4. The hardness of molded parts should be no less than 50HRC, or the hardness of surface hardening treatment should be higher than 600HV.

Eject, reset, extract core, and remove parts

1. When ejecting, it should be smooth, without jamming, and without abnormal sounds.

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

3. The sliding parts should have oil grooves, and the surface should be nitrided. After treatment, the surface hardness should be above HV700.

4. All ejector pins should be positioned to prevent rotation, and each ejector pin should be numbered.

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

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

7. The slider and core-pulling should have travel limits. The small slider is limited by a spring. When the spring is inconvenient to install, a wave screw can be used; the cylinder core-pulling must have a travel switch.

8. The core-pulling of the slider generally uses an inclined guide post, and the angle of the inclined guide post should be 2°~3° smaller than the angle of the slider locking surface. If the slider stroke is too long, an oil cylinder should be used to extract it.

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

10. There should be a wear-resistant plate under the large slider with a slider width exceeding 150 mm. The wear-resistant plate material should be T8A. The hardness after heat treatment is HRC50~55. The wear-resistant plate is 0.05~0.1 mm higher than the large surface, and Open oil tank.

11. The push rod should not move up and down.

12. Add barbs to the ejector pin. The direction of the barbs should be consistent and the barbs should be easy to remove from the product.

13. The matching clearance between the ejector hole and the ejector pin, the length of the sealing section, and the surface roughness of the ejector pin hole should be in accordance with relevant enterprise standards.

14. The product should be easy for the operator to remove.

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

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

17. There should be no iron filings or debris in the oil passage holes on the mold base.

18. The end surface of the return rod is flat and has no spot welding. The bottom of the embryo head has no gasket and is spot welded.

19. The gate plate of the three-plate mold guides and slides smoothly, and the gate plate is easy to pull apart.

20. The limit tie rods of the three-plate mold should be arranged on both sides of the mold installation direction, or pull plates outside the mold frame to prevent the limit tie rods from interfering with the operator.

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

22. An exhaust port should be opened at the bottom of the guide sleeve.

23. There should be no gap when installing the positioning pin.

Cooling and heating systems

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

2. The sealing should be reliable, the system should not leak under 0.5MPa pressure, and should be easy to repair.

3. The size and shape of the sealing groove opened on the mold base should comply with relevant standards.

4. The sealing ring should be smeared with butter when placed, and should be higher than the surface of the mold frame after placement.

5. The water and oil flow channel spacers should be made of materials that are not susceptible to corrosion.

6. The front and rear molds should use centralized water supply.

Gating system

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

2. The cross-section and length of the flow channel should be designed reasonably. 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. At the same time, the plastic loss in the pouring system should be minimal.

3. The cross-section of the three-plate mold sub-runner on the back of the front template should be trapezoidal or semicircular.

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

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

6. The gate and runner should be processed by machine according to the size requirements of the drawing, and manual grinding and grinding are not allowed.

7. Point gate The gate should be in accordance with the specifications.

8. There should be an extension at the front end of the runner as a cold material hole.

9. The Z-shaped undercut of the pulling rod should have a smooth transition.

10. The runner on the parting surface should be circular, and the front and rear molds cannot be misaligned.

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

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

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

14. For curved hook latent gate, the two parts of the insert should be nitrided and the surface hardness should reach HV700.

Hot runner system

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

2. The hot runner should be tested for safety, and the insulation resistance to ground should be greater than 2MW.

3. The temperature control cabinet, hot nozzle, and hot runner should use standard parts.

4. The main inlet sleeve is connected to the hot runner with threads, and the bottom surface is flat for contact sealing.

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 fit is good.

6. A J-type thermocouple should be used and matched with the temperature control meter.

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

8. The nozzle should meet the design requirements.

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

10. There should be a thermal 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 the nozzle mounting hole should be connected through.

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

14. If there are two sockets of the same specifications, they should be clearly marked.

15. The control wire should be sheathed and not damaged.

16. The temperature control cabinet has a reliable structure and no screws are loose.

17. The socket is installed on the bakelite board and cannot exceed the maximum size of the template.

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

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

20. Before the formwork is assembled, all circuits are free of open or short circuits.

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

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

Molded part, parting surface, exhaust groove

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

2. When the insert is matched with the mold frame, there should be a gap of less than 1 mm around the rounded corners.

3. The parting surface should be kept clean and tidy, no portable grinding wheel should be used to avoid voids, and there should be no dents in the sealing part.

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

5. The inserts should be properly researched, placed smoothly, and positioned reliably.

6. Inserts, inlaid cores, etc. should be reliably positioned and fixed, round parts have anti-rotation, and no copper or iron sheets should be placed under the inlays.

7. The end surface of the ejector pin is consistent with the core.

8. There are no defects such as undercuts and chamfers in the front and rear molding parts.

9. The tendons should be pushed out smoothly

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

11. The locking surface of the mold base should be ground and matched in place, with more than 75% of the area touching.

12. The ejector pin should be arranged closer to the side wall and next to the ribs and bosses, and a larger ejector pin should be used.

13. For the same pieces, the numbers 1, 2, 3, etc. should be marked.

14. Each collision surface, insertion surface, and parting surface should be ground and matched in place.

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

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

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

18. Jacking pipes should be used for screw columns with a depth exceeding 20 mm.

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

20. The width of the ribs should be less than 60% of the wall thickness on the exterior surface.

21. The inlays on the inclined roof and slider should have reliable fixing methods.

22. When the front mold is inserted into the rear mold or the rear mold is inserted into the front mold, the surroundings should be locked with bevels and machined to avoid voids.

Injection molding production process

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

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

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

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

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

6. During the injection molding production process, the removal of the product and nozzle material must be easy and safe (the time generally does not exceed 2 seconds each).

7. For molds with inserts, the inserts must be easily installed and fixed reliably during production.

Packing and shipping

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

2. Sliding parts should be lubricated.

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

4. The mold should be equipped with a clamping piece, and the specifications should meet the design requirements.

5. Spare parts and wearing parts should be complete, with detailed lists and supplier names.

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

7. Spray paint on the outer surface of the mold, as required by the customer.

8. The mold should be packaged in moisture-proof, waterproof, and bump-proof packaging. If the customer has requirements, follow the requirements.

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