Mould acceptance standard

A, molding, product appearance, size, to cooperate

Product surface does not allow defects: lack of material, burning, white, white line, flashes, sparkling, white (or cracking, tensile), drying, wrinkles..

2. The weld mark: general fusion seam circular perforation length is not more than 5 mm, profiled perforation length of weld mark is less than 15 mm, the intensity of fusion seam and can pass the function test..

3. The contract: a conspicuous location on the surface are not allowed to shrink, not obvious place to allow a slight shrink (feel no identation).

4. General small products surface roughness is less than 0.3 mm, there is a requirement for assembly to ensure assembly requirements.

5. Look obviously cannot have tattoos, flowers, products generally cannot have bubbles.

6. Product geometry size should comply with the formal effective precision mould drawings (or 3 d files) requirements, the product of tolerance should be in accordance with the principle of tolerance, the axial size tolerance is negative tolerance, hole are class size tolerance is tolerance, customers according to the requirements of the request.

7. Product wall thickness: product wall thickness generally required average wall thickness, the average thickness shall conform to the requirements of the drawings, the tolerance according to the mould features should be 0.1 mm..

8. Products matching: the shell of pan cooperates: surface displacement is less than 0.1 mm, not scraping the hand phenomenon, cooperate with the requirements of hole, shaft, face to ensure that the interval and use requirements.

Second, mould appearance

1. Mould nameplate content integrity, character is clear, neat rows.

2. The nameplate shall be fixed on the mold feet close to the template and reference Angle. Name plate fixed reliable, not easy peeling off.

3. The cooling water mouth should choose plastic block water mouth, according to the requirements of the customer requires otherwise.

4. Cooling water mouth should not be out of the surface of the frame

5. Cooling water mouth to sink hole processing, sink hole diameter is 25 mm, 30 mm, 35 mm three kinds of specifications, the orifice chamfering, chamfer should be consistent..

6. The cooling water mouth should be in and out of the tag.

7. Mark the English characters and Numbers should be more than 5/6, position in the water mouth below 10 mm, the handwriting should be clear, beautiful, neat and uniform spacing.

8. Mold parts shall not influence the mould lifting and stored. Installed below the leakage oil cylinder, water mouth, resetting mechanism, etc, should be supporting leg protection.

9. The installation of the support legs screw through the support leg is fixed in the mold frame, long support legs can transport processing external thread pillar tighten in the mold frame.

10. Mold ejection hole size shall conform to the requirements of the specified injection molding machine, in addition to the small mould, can''t use only one center out.

11. Positioning circle should be fixed reliable, the circle diameter is 100 mm, 250 mm two, positioning ring above the bottom 10 ~ 20 mm. Except as otherwise the requirements of the customers.

12. The mould dimension shall conform to the specified the requirements of the injection molding machine.

13. There is a requirement for direction installation mould will be put in the template before or after the template installation direction indicated by the arrow, the arrow shall have the word \"UP\", beside the arrow and words are all yellow, word UP to 50 mm.

14. The surface of the frame should not have pits, rust, extra rings, in and out of the water vapor and oil hole as well as the defects affect the appearance.

15. The mold should facilitate lifting, transportation, hoisting shall not remove the mould parts, rings no mouth with water, oil cylinder, interference reset lever, etc.

Three, die material and hardness

1. Mold die set should be chosen accord with standard of die set.

2. The molding parts and gating system (core, dynamic set mould set piece, activities set piece, diversion cone, push rod, gate set) materials with over 40 cr performance above materials.

3. The molding of plastic to the mold easy corrosion, forming parts should be made of corrosion resistant material or the molding surface anti-corrosion measures should be taken.

4. The molding parts shall be not less than 50 HRC hardness, or surface hardening treatment should be higher than 600 hv hardness.

Four, ejection, reset, thrusting core, pick-up

1. The ejector should be smooth, no binding, no abnormal sound.

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

3. The sliding parts should open groove, the surface nitriding processing, surface hardness of above HV700.

4. All the plunger should be check positioning, each push rod should be numbered.

5. Application limit block out distance limit.

6. Return spring should choose standard parts, shall not be polished on both ends of the spring, cut out.

7. The slider, core-pulling due and limit, small slider with a spring limit, spring inconvenience when installation available wave of screw; Oil cylinder core-pulling must have a travel switch.

8. Slide block core-pulling generally adopts the inclined guide pillar, Angle of oblique guide pillar should be smaller than the slider locking surface Angle 2 ° ~ 3 °. Long stroke cylinder pull should be adopted.

9. Oil cylinder core-pulling molding part of the face was enshrouded, oil cylinder should be self-locking mechanism.

More than 10. The slider width should be 150 mm below the slider wear plate, wear-resistant plate material should choose T8A, after heat treatment the hardness of HRC50 ~ 55, wear-resistant plate is 0.05 ~ 0.1 mm higher than bedding face, and open system of oil tank.

11. A push rod should not string move up and down.

12. Add the barb plunger barb direction should be consistent, barb is easy to remove from the products.

13. The plunger hole and the fitting clearance of plunger, sealing glue length, plunger, the surface roughness of the hole should be in accordance with the requirements of relevant enterprise standards.

14. Products should be conducive to operators.

15. When products out easy follow the inclined top plunger should add slot or etch.

16. On the top bar on the top piece, should be solid and reliable, and around the molding part should be processed 3 ° ~ 5 ° slope, the lower surrounding should be chamfer.

17. Die oil hole should be no iron debris on the shelf.

Flat end face 18. Push pin, no spot welding. Embryo at the bottom of the head without gaskets, spot welding.

19. The three board gate plate guide slide smoothly, gate plate is easy to open.

20. Three board mould limit both sides of the rod should be layout in the mold installation direction, or outside the die set gallas board, prevent limit lever and operator intervention.

21. The oil airway should be smooth, hydraulic ejector reduction should be in place.

22. The guide sleeve should be open at the bottom of the vent.

23. The locating pin installation cannot have clearance.

Five, cooling and heating system

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

2. The seal should be reliable, the system under the pressure of 0.5 MPa can not have leakage phenomenon, easy to maintenance.

3. Open in mould frame of the size and shape of the seal groove should comply with the relevant standards.

4. The sealing ring should be placed butter, placed after the die set above the surface.

5. Water, fluid passage spacers should be susceptible to corrosion of the materials.

6. Before and after the mold method of centralized water, should be adopted.

Six, gating system

1. The gate set shall not influence the product appearance, meet the product assembly.

2. Length of flow channel section, should design reasonable, on the premise of guarantee the quality of forming try to shorten the process, reducing cross-sectional area to shorten the filling and cooling time, plastic pouring system loss should be at least at the same time.

3. Three board runner mould points in the template before back part of the cross section shall be the trapezoidal or semicircle.

4. Three board mould has broken on the gate board material, sprue entry should be less than 3 mm in diameter, ball head office have dented gate plate of a deep the steps of 3 mm.

5. Ball head pull rod should be reliable fixation, but pressure below the set ring, headless screws are available, and can also use clamp down.

6. Sprue, runner size according to the drawing requirements should use machine should be processed, do not allow manual grinding machining.

7. At point sprue gate shall be in accordance with the requirements of specification.

8. Distributary channel front end should be a prolongation as cold material.

9. Pull rod material buckle the Z should be smooth transition.

10. Distributary channel should be circular, parting surface before and after the mold can''t dislocation.

11. The latent type gate lifter rods shall be of no surface shrinkage.

12. Transparent products cold material hole diameter and depth should comply with the design standards.

13. The material is easy to remove, appearance without gate marks, product assembly no residual material used.

14. Hooks latent type gate, two blocks should nitriding processing, surface hardness of HV700.

Seven, the hot runner system

1. The hot runner connection layout should be reasonable, easy to maintenance, wiring should be one to one correspondence.

2. Hot runner should be safety testing, to ground insulation resistance is greater than 2 mw.

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

4. The mainstream mouth to use thread connected with hot runner, bottom plane contact seal.

5. Hot runner in contact with the heating plate or heating bar is good, the heating plate with fixed bolt or stud, surface is achieved.

6. J type thermocouple should be adopted, and matching with temperature control table.

7. Each set of heating element should be control thermocouple, thermocouple location layout is reasonable.

8. The nozzle should meet the design requirements.

9. Hot runner due and reliable positioning, there must be at least two positioning pin, or screws.

10. Between hot runner and the template should be insulated pad.

11. Temperature control table set temperature and real temperature error should be less than + / - 5 ° C, and the temperature control is sensitive.

12. Cavity and nozzle mounting holes should be through.

13. The hot runner connection should be tied, and covered with press plate.

14. There are two of the same specifications, socket should have a clear mark.

15. The line of control should be sheathed, no damage.

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

17. The socket installed on the electric board, not beyond the maximum size template.

18. The wires are not allowed to show on the outside of the mold.

19. The hot runner or template all contact with the wires should be rounded transition.

20. In the template before assembly, all lines are no breaking short circuit phenomenon.

21. All connections should be correct, insulation performance is good.

22. After the template on clamping, all circuits multimeter to check again.

Eight, molding parts, parting surface and exhaust slot

1. Before and after the mold surface should be not affect the appearance of smooth, pits, rust and other defects.

2. Blocks with frame, rounded corners should be less than 1 mm gap.

3. The parting surface clean, neat, no portable grinding wheel grinding avoid empty, no sag of sealant.

4. Exhaust slot depth should be less than the plastic overflow boundary value.

5. Insert bedding-in should be in place to put the smooth and reliable positioning.

6. Set piece, with the core should be fixed and reliable positioning, such as a round piece of check, block below don''t mat of copper and iron.

7. Push rod end face is consistent with the core.

Forming part of before and after 8. No defects such as torque, chamfering.

9. Rib ejection should be smoothly.

Around 10. Multi-cavity mould products, symmetry, shall indicate the L or R, the customer requirements, the position and size shall conform to the requirements of the customers, in does not affect the appearance and assembly place plus, font size is 1/8.

11. Die set bedding-in locking surface should be in place, more than 75% of the area hit.

12. The plunger should be layout in near and near wall reinforcement, next to the convex platform, and using larger plunger.

13. For the same thing should indicate the no. 1, 2, 3, etc.

14. The touch wear surface and wear surface, parting surface should be bedding-in in place.

15. Parting surface sealant part should comply with the design standards. Medium mould under 10 to 20 mm, large mold 30 ~ 50 mm, avoid empty the rest of the machining.

16. Prints and sand should be uniform to meet the customers requirements.

17. The appearance with the requirements of the products, the products on the screw should be shrink proof measures.

18. The depth of more than 20 mm screw column should choose pipe jacking.

19 products wall thickness should be uniform, deviation control under + / - 0.15 mm.

20. The width of the rib should be below sixty percent of the appearance of the side wall thickness

21. The inclined top, slide block core should be reliable fixed way.

22. The die insert after die before or after the die insert before die, should be around cant lock machined components from the empty.

Nine, injection molding production process

1. Mold within the scope of the condition of normal injection molding process, should have the stability and the process parameters of molding production set-up repeatability.

2. Mold injection molding production injection pressure, average should be less than 85% of the rated maximum injection pressure injection molding.

3. The mould injection molding production of injection speed, three-quarters of the injection speed of less than 10% of the rated maximum speed injection or more than 90% of the rated maximum injection speed.

4. Mold injection molding production when the holding pressure generally should be less than 85% of the actual maximum injection pressure.

5. Mould clamping force of molding production, should be less than 90% of rated clamping force suitable model.

6. Injection production process, product and material floolwing out more easily, safe (time average no more than 2 seconds).

7. Insert products mold, when production insert easy installation and reliable fixed to insert.

Ten, packaging, and transportation

1. The mold cavity should be cleaned up and spray anti-rust oil.

2. The sliding parts should be coated lubricating oil.

3. The gate set of inlet used grease seal.

4. The mould clamping piece should be installed, and specifications comply with the design requirements.

5. Spare parts should be complete, parts, attached name list and suppliers

6. Mold water, liquid, gas and electricity sealing measures should be taken to seal to prevent foreign matter into the import and export;

7. Mold surface spray paint, customer according to the requirements of the request.

8. The mould should be moistureproof, waterproof, prevent knock against packaging, customer according to the requirements of the request.

9. Mould product drawings, structure drawings, cooling heating system, hot runner drawing drawings, spare parts and mould material supplier details, specification, test report, factory inspection certificate, electronic documents shall be complete.