Warm Global Customers
With China Plastic Machinery
With China Plastic Machinery
Injection mold acceptance standards are standards for approving molds from three aspects: mold structure, plastic parts quality, and injection molding process requirements.
Based on this, the mold quality is evaluated and scored, hoping to continuously improve the mold quality; ensure that the mold can be put into production normally, and produce plastic parts of qualified quality to meet the requirements of product design.
I. Mold materials
1. The steel used for each plate of the mold base is not less than 1050 steel. (Equivalent to Japan's ace steel)
2. The surface hardness of the materials used for the base, side nails, back nails, middle brackets, and middle brackets is not less than HRC60.
3. For ABS and HIPS materials, the front mold and front mold inserts use super P20 steel (such as 718, M238, etc.). The rear mold uses general P20 steel (such as MUP, M202, etc.), and the rear mold inserts use 1050-1055 steel or better steel.
4. For beer PC, POM, PE and other corrosive materials, the front and rear molds and their inserts must use 420 steel (such as S136, M300, M310, etc.).
5. The steel used for beer mirror molds is 420 steel (such as S136, M300, M310, etc.).
6. The surface hardness of the inclined top and the swing rod shall not be less than HRC35, and the surface hardness of the push plate shall not be less than HRC28.
7. If the customer specifies that the mold steel should be used, the mold factory shall meet the customer's requirements.
2. The mold should have a structure
1. Mold identification: The outside of the mold base should be marked with text according to the customer's requirements. The P/N number and the plastic part brand shall be marked in the position specified by the customer inside the mold base. The cavity number shall be marked for a mold with multiple cavities, and the insert number shall be marked for multiple inserts according to the design requirements.
2. The mold should be installed with a suitable flange ring and a standard code mold pit.
3. The three-plate mold should be installed with a buckle lock and a locking pin, and the pull hook and the nozzle plate should be installed, and the elastic ring should be opened first.
4. The mold bottom plate should have a qualified ejector rod hole, and the hole position should meet the ejection balance requirements.
5. The mold ejector plate should be equipped with a reset spring. When closing the mold, the front template should first contact the return needle, otherwise the mold should first install the reset mechanism (separate requirements for the slide structure).
6. Slide structure.
a. The slide movement should be smooth, and the contact surface should have an oil groove.
b. The slide should be installed with a spring that makes the slide pop up, and a limit device should be installed.
c. The total ejection height of the half block moving in the height direction cannot exceed 2/5 of the length of the guide slide.
7. Ejection mechanism.
a. The ejector pin should be set so that the plastic parts will not be permanently deformed, whitened, or affect the appearance of the plastic parts when demolding.
b. The ejector pin mechanism should be flexible, reliable, and not cause erroneous actions.
c. When the top surface of the ejector pin and the ejector sleeve is not flat, the ejector pin and the ejector sleeve should be positioned.
8. Trash pins should be evenly set on the bottom plate, and the height of the trash pins should be consistent.
9. Large molds of 4545 or above should be equipped with a middle support edge. If the number of ejectors in a set of molds reaches or exceeds 16, a middle support edge should be added.
10. The diameter and length of the runner should be processed reasonably. Under the premise of ensuring the quality of forming, the process should be shortened as much as possible, and 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 minimized. The runner should generally be equipped with a cold well.
11 The cavity distribution should be reasonable and should comply with the principle of filling all cavities at the same time. The gate setting should not affect the appearance of the plastic parts and meet the requirements of plastic parts assembly. The gate residue should be minimized as much as possible under the conditions allowed by the brewing process.
12 Cooling system.
a. The water flow channel division should make the temperature difference of each part of the mold surface within 10¡æ.
b. The position of the water flow channel inlet and outlet should not affect the installation, and the size of the nozzle is 13mm.
c. The inserts and runners on the cavity surface should generally be connected to the water flow channel. The inserts such as the battery pocket, handle position, and speaker position must be connected to the water flow channel.
d. The mold water flow channel should not leak, and the words "OUT" and "IN" should be marked at the flow channel inlet and outlet. If there are multiple groups of water flow channels, the group number should also be added.
13 The battery pocket and other parts that have a greater clamping force on the front mold should be evenly added with hooks and other parts at the corresponding rear mold parts.
14 The mold structure ensures smooth exhaust.
15 If the column height exceeds 20mm, a sleeve should be used. If the bone position exceeds 25mm, glue guides should be evenly added according to the design requirements.
16 The mold should be evenly distributed with support heads according to the strength requirements to prevent the mold from deforming.
17 The stress center of the mold cavity should be consistent with the mold center as much as possible, and the center of the cavity should not exceed 25% of the mold center at most.
18 If there are any shrinkage-causing parts on the surface of the outer shape, a volcanic crater should be added to the corresponding rear mold column.
19 For molds with one-way inclined surfaces and large deep cavities, the parting surface should be equipped with a reliable self-locking device.
III. Unallowed structures of molds
1. The mold is not allowed to have sharp steel or thin steel with a height greater than 2mm and a thickness less than 1mm.
2. Except for the BOSS column, the ejector pin is not allowed to contact the front mold.
3. There is no abnormal sound when the mold is opened and closed.
4. The red lead test is not allowed to be within 5mm of the cavity edge, and the red lead test of the parting surface is not allowed to be less than 80%.
5. All fastening screws are not allowed to be loose.
6. All hooks are not allowed to have different directions.
7. The plastic parts are not allowed to have mold sticking.
8. The mold is not allowed to have unbalanced ejection.
9. The front and rear templates in the height direction of the mold are not allowed to lack the pull hole.
10. The mold assembly is not allowed to miss or install the wrong parts.
I. Basic dimensions
1. The geometric shape and size accuracy of the plastic parts should meet the requirements of the formal and effective mold opening drawings (or 3D files).
2. General structural size standards.
a. Generally, the average glue thickness is required for the rubber parts, and the non-average glue thickness should meet the requirements of the drawings.
b. The root diameter of the stud: M3 screw is ¦Õ6.0+0.2mm, the crater diameter is ¦Õ10.0mm; M2.6 screw is ¦Õ5.0+0.2mm, the crater diameter is ¦Õ9.0mm.
c. The root thickness of the fork bone and the perimeter bone: 1.2+0.2mm.
d. The top thickness of the RUBBER cross bone of the button: 0.9+0.1mm.
e. The top wall thickness of the cylinder column: 1.2¡À0.1mm.
f. The glue thickness of the hook needle position of the battery box rear mold is less than 2.0mm.
g. The misalignment of the front and rear molds of the rubber parts at the same PL surface is less than 0.05 mm.
h. The surface and bottom shells match.
3. The second or third level stopper fit requires that the PL surface misalignment is less than 0.1 mm, and there is no scratching phenomenon;
4. The single-side clearance of the stopper fit is 0.1~0.3 mm, and the larger value is used for complex shapes.
a. The horizontal single-side clearance between the battery door and the battery box is 0.2~0.3 mm.
b. Button and hole fit. The single-side clearance between the general geometric button and the hole is 0.15~0.25 mm. The single-side clearance between the special-shaped button and the hole is 0.3~0.4 mm, and the clearance of the injection button should be the larger value. When the button and the flower are matched, the matching situation can meet the safety test standard.
c. Card insertion position fit. The single-side clearance between the card insertion door and the bottom shell is 0.2~0.3 mm. The single-side clearance between the socket and the plug box is 0.5mm.
d. The minimum single-side clearance of the four major parts of the shaft position is 0.1~0.2 mm.
e. The single-side clearance between LOCK and its matching pillow hole is 0.2 mm.
f. The single-side clearance between the bracket and its matching hole is 0.1-0.2 mm, and the larger value is taken when the length is greater than 150 mm.
g. The single-side clearance between COVER and its matching hole is 0.1 mm.
h. The single-side clearance between ROLLER and its matching hole is 0.5-1.0 mm.
I. When the process conditions cannot be met:
1. Defects are not allowed on the surface of the rubber parts.
a. Uneven glue flow (or lack of material, stagnant water)b. Burntc. White top
d. White linee. Peak f. Bubbling
g. White pull (or crack, break)h. Baking marki. Wrinkles
2. Surface restricted defects and acceptance degree.
1. Surface highlight.
a. The highlight surface should be flat and have a mirror effect;
b. The non-exterior surface of the front mold surface and the internal parts are allowed to have slight processing marks on the surface.
c. The highlight surface is not allowed to have scratches, rust, spots and other defects.
2. Surface decoration (EDM or sunburn).
a. The texture meets the design requirements, the texture should be uniform and the side and surface are consistent.
b. The texture of the mutual accessories is required to be consistent. (Except for the matching of old parts)
3. Surface font.
a. The height of the surface font meets the design requirements and must be uniform and consistent.
b. The font width, size, density, number of words and position meet the film requirements.
4. Modification of the CORE surface.
a. The height of the surface font meets the design requirements and must be uniform and consistent.
b. The font width, size, density, number of words and position meet the film requirements.
4. Modification of the CORE surface.
a. Generally, the CORE surface needs to be light-saving, without obvious spark patterns and processing marks, except for special requirements.
b. The transparent plastic parts or the appearance surface after assembly meet the design requirements.
1. The mold should have the stability of production and the repeatability of process parameter adjustment within a certain range of injection molding process conditions.
2. The injection pressure during mold production should generally not exceed 85% of the rated maximum injection pressure of the injection molding machine.
3. The injection speed during mold production, the injection speed of three-quarters of the stroke should 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 production should generally not exceed 85% of the actual maximum injection pressure.
5. The clamping force during mold production should not exceed 90% of the rated clamping force of the applicable model.
6. During the beer making process, the removal of the product and the water outlet material should be easy and safe (the time should generally not exceed 2 seconds).
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