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Acceptance Of Injection Mold Must Do This 10 Points!
Jun 05, 2018

Core Tip: Acceptance of injection molds must do this 10 points!

  13. Numbers 1, 2, 3, etc. should be indicated for the same item.

 

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

 

    15. The parting surface sealant part should meet the design standards. Medium-sized molds below 10~20mm, large-scale molds 30~50mm, and the remaining parts are machined to avoid air.

 

    16. Dermatoglyphs and sandblasting should meet customer requirements evenly.

 

    17. Appearance of the requirements of the product, the product of the screw should have anti-shrinkage measures.

 

    18. The top tube should be used for screw columns with a depth of more than 20mm.

 

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

 

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

 

    21. Inclined roof, insert on the slider should have a reliable fixation.

 

    22. The front mold is inserted into the front mold or the rear mold is inserted into the front mold, and there should be a bevel lock and machining avoidance around the front mold.

 

    Nine, injection molding production process

 

    1. In the range of normal injection molding process conditions, the mold should have the stability of the injection molding production and the repeatability of the adjustment of the process parameters.

 

    2. Injection molding injection molding pressure, generally should be less than the injection molding machine rated maximum injection pressure of 85%.

 

    3. The injection speed of the mold during injection molding is three quarters of the injection speed not less than 10% of the rated maximum injection speed or more than 90% of the rated maximum injection speed.

 

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

 

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

 

    6. During the injection molding process, the product and outlet material should be taken out easily and safely (usually the time does not exceed 2 seconds each).

 

    7. Molds with inserts are easy to install, and inserts must be securely fixed during production.

 

    X. Packaging and Transportation

 

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

 

    2. Sliding parts should be lubricated.

 

    3. Apply sprue to the feed inlet of the sprue bushing.

 

    4. The mold should be installed with a clamping plate, the specifications meet the design requirements.

 

    5. Spare parts wearing parts should be complete, with schedule and supplier name

 

    6. Mold water, liquid, gas, electricity import and export should take seal measures to prevent foreign matter from entering;

 

    7. The outer surface of the mold is sprayed with paint. The customer has requirements as required.

 

    8. Molds should be moisture-proof, waterproof, bump-proof, and customer-required.

 

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

20. The three-plate mold limit lever should be arranged on both sides of the mold installation direction, or pull plate outside the mold frame to prevent interference between the limit lever and the operator.

 

    21. The airway airway should be smooth and the hydraulic ejection should be in place.

 

    22. The bottom of the guide sleeve should open the exhaust port.

 

    23. The positioning pin can not be installed.

 

    V. Cooling and Heating System

 

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

 

    2. The seal should be reliable, the system must not have leakage under 0.5MPa pressure, easy to overhaul.

 

    3. The size and shape of the seal groove opened on the mold frame should meet the relevant standards.

 

    4. When the sealing ring is placed, it should be coated with butter and placed on the mold surface after being placed.

 

    5. Water and oil passage separators should be made of materials that are not susceptible to corrosion.

 

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

 

    Six, pouring system

 

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

 

    2. The flow passage section and length 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. At the same time, the plastic loss of the pouring system should be minimum.

 

    3. Partial cross-section of the three-plate mold runner at the back of the front mold shall be trapezoidal or semi-circular.

 

    4. The three-plate die has a material blank on the gate plate, the diameter of the runner inlet should be less than 3mm, and there is a deep 3mm step of the concave gate plate at the ball head.

 

    5. The ball puller should be fixed securely. It can be pressed under the positioning ring. It can be fixed with a headless screw, or it can be pressed with a pressure plate.

 

    6. The gates and runners should be machined according to the drawing size requirements. Manual mill rejection is not allowed.

 

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

 

    8. The front part of the runner should have an extended part as a cold material pocket.

 

    9. The Z-shaped undercut of the puller bar should have a smooth transition.

 

    10. The runner on the parting surface should be round and the front and rear molds should not be misaligned.

 

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

 

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

 

    13. The material is easy to remove, the appearance of the product without gate marks, there is no residual material in the assembly of the product.

 

    14. Hook the submerged gate, two parts of the insert should be nitrided, the surface hardness reaches HV700.

 

    Seventh, hot runner system

 

    1. The layout of the hot runner wiring should be reasonable, easy to overhaul, and the wiring numbers should correspond one to one.

 

    2. Hot runners should be tested for safety and the insulation resistance to ground is greater than 2 MW.

 

    3. Temperature control cabinets and hot nozzles, hot runners should use standard parts.

 

    4. The main mouthpiece is connected with the hot runner by threads and the bottom surface is in contact with the seal.

 

    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 is well-bonded.

 

    6. Type J thermocouples should be used and matched with the temperature control meter.

 

    7. Each set of heating elements should have thermocouple control, and the thermocouple position is reasonable.

 

    8. The nozzle should meet the design requirements.

 

    9. The hot runner should have a reliable positioning, at least two positioning pins, or screws.

 

    10. There should be a thermal pad between the hot runner and the template.

 

    11. The temperature control table set temperature and the actual display temperature error should be less than ± 5 °C, and temperature sensitive.

 

    12. The cavity and nozzle mounting holes should pass through.

 

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

 

    14. There are two outlets of the same specification and should be clearly marked.

 

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

 

    16. Temperature control cabinet structure is reliable, no loose screws.

 

    17. The socket is mounted on a bakelite board and cannot exceed the maximum size of the board.

 

    18. The wire is not exposed outside the mold.

 

    19. Hot runners or stencils shall have rounded corners where all contact with the wires is made.

 

    20. There is no open circuit short circuit on all the lines before the template is assembled.

 

    21. All wiring should be properly connected and the insulation performance is good.

 

    22. After the formwork is clamped, all lines are checked again using a multimeter.

 

    Eight, forming part, parting surface, exhaust slot

 

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

 

    2. The inserts should be matched with the frame, and the roundness around the edges should be less than 1mm.

 

    3. The parting surface shall be kept clean and tidy, and there shall be no hand wheel grinding to avoid the air, and there shall be no depressions in the glue sealing part.

 

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

 

    5. Inserts should be placed in place, placed smoothly, reliable positioning.

 

    6. Inserts, inserts, etc. shall be reliably positioned and fixed. The circular members shall have a rotation stop. Under the inserts, there shall be no copper or iron sheets.

 

    7. The top end of the jack is consistent with the core.

 

    8. The front and rear molding parts have no defects such as undercuts, chamfers and so on.

 

    9. The ribs should top out smoothly.

 

    10. Products of multi-cavity moulds are symmetrical about the left and right parts. They should be marked with L or R. If customers have requirements on the position and size, they should meet the requirements of customers. Normally, they should be added where the appearance and assembly are not affected. The font size is 1/8. .

 

    11. Mold clamping surface should be in place, more than 75% of the area encountered.

 

    12. The top bar should be located near the side wall and beside the ribs and bosses, and use a larger top bar.

13. Numbers 1, 2, 3, etc. should be indicated for the same item.

 

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

 

    15. The parting surface sealant part should meet the design standards. Medium-sized molds below 10~20mm, large-scale molds 30~50mm, and the remaining parts are machined to avoid air.

 

    16. Dermatoglyphs and sandblasting should meet customer requirements evenly.

 

    17. Appearance of the requirements of the product, the product of the screw should have anti-shrinkage measures.

 

    18. The top tube should be used for screw columns with a depth of more than 20mm.

 

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

 

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

 

    21. Inclined roof, insert on the slider should have a reliable fixation.

 

    22. The front mold is inserted into the front mold or the rear mold is inserted into the front mold, and there should be a bevel lock and machining avoidance around the front mold.

 

    Nine, injection molding production process

 

    1. In the range of normal injection molding process conditions, the mold should have the stability of the injection molding production and the repeatability of the adjustment of the process parameters.

 

    2. Injection molding injection molding pressure, generally should be less than the injection molding machine rated maximum injection pressure of 85%.

 

    3. The injection speed of the mold during injection molding is three quarters of the injection speed not less than 10% of the rated maximum injection speed or more than 90% of the rated maximum injection speed.

 

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

 

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

 

    6. During the injection molding process, the product and outlet material should be taken out easily and safely (usually the time does not exceed 2 seconds each).

 

    7. Molds with inserts are easy to install, and inserts must be securely fixed during production.

 

    X. Packaging and Transportation

 

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

 

    2. Sliding parts should be lubricated.

 

    3. Apply sprue to the feed inlet of the sprue bushing.

 

    4. The mold should be installed with a clamping plate, the specifications meet the design requirements.

 

    5. Spare parts wearing parts should be complete, with schedule and supplier name

 

    6. Mold water, liquid, gas, electricity import and export should take seal measures to prevent foreign matter from entering;

 

    7. The outer surface of the mold is sprayed with paint. The customer has requirements as required.

 

    8. Molds should be moisture-proof, waterproof, bump-proof, and customer-required.

 

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