First, plastic mold after the completion of molding product appearance, size, cooperation
1, product surface does not allow defects: lack of material, burning, top white, white line, peak, foaming, whitening (or cracking, pulling), baking, wrinkles.
- Fuse marks: general circular perforated fuses length is not greater than 5mm, shaped perforated fuses length is less than 15mm, fuse marks strength and can pass the functional safety test.
3, shrinkage: the appearance of the surface obviously does not allow there is contraction, not obviously allowed to have a slight shrinkage (feel not dented).
4, the general small product plane unevenness is less than 0.3mm, there are assembly requirements to ensure assembly requirements.
5, the appearance of obvious places can not have air patterns, flowers, products generally can not have bubbles.
6, the geometry of the product, size accuracy should meet the formal and effective open mold drawings (or 3D files) requirements, product tolerances need to be based on tolerance principle, shaft size tolerances are negative tolerances, hole size tolerances are positive tolerances, customers have requirements according to requirements.
7, product wall thickness: product wall thickness general requirements to achieve average wall thickness, non-average wall thickness should meet the requirements of drawings, tolerances according to mold characteristics should be -0.1mm.
8, product cooperation: face shell bottom shell fit: surface misalmeanment is less than 0.1mm, can not have scraping phenomenon, there is a requirement for the hole, shaft, surface to ensure the interval and use requirements.
Second, the appearance of the mold
1, mold nameplate content is complete, characters clear, neatly arranged.
2, the nameplate should be fixed on the foot of the mold near the template and the base angle. Nameplates are reliable and not easy to peel off.
3, cooling water nozzle should choose plastic block water nozzle, customers have other requirements according to the requirements.
4, cooling nozzle should not extend out of the mold frame surface
5, cooling nozzle to be processed sink hole, sink hole diameter of 25mm, 30mm, 35mm three specifications, hole cornering, angle should be consistent
6, cooling nozzle should have access marks
7, mark English characters and numbers should be greater than 5
8, the position is directly 10mm below the water nozzle, the handwriting should be clear, beautiful, neat, even spacing.
9, mold accessories should not affect the mold lifting and storage. There are exposed cylinders, nozzles, pre-reset mechanisms, etc. under the installation, which should be protected by supporting legs.
10, the installation application screw of the supporting leg is fixed to the mold frame through the support leg, and the long support leg can be fastened to the mold frame by the external threaded column of the car processing.
11, mold top hole size should meet the specified requirements of the injection molding machine, in addition to small molds, can not only use a center top out.
12, positioning ring should be fixed and reliable, ring diameter of 100mm, 250mm two, positioning ring 10 to 20mm higher than the base plate. Unless otherwise requested by the customer.
13, mold form factor should meet the requirements of the designated injection molding machine.
14, the installation of direction requirements of the mold should be in the front template or the rear template with arrows indicating the installation direction, arrows should be next to the word “UP”, arrows and text are yellow, the word height of 50 mm.
15, the surface of the mold frame should not have pits, rust, excess rings, in and out of water vapor, oil holes and other defects affecting the appearance.
16, the mold should be convenient for lifting, transportation, lifting may not remove mold parts, lifting ring should not interfere with the water nozzle, cylinder, pre-reset rod and so on.
Third, mold material and hardness
1, mold mold frame should be selected in line with the standard standard mold frame.
2, mold molding parts and pouring system (core, dynamic molding blocking, active blocking, sequestration cones, pushers, gate sets) materials with a performance of more than 40Cr materials.
3, molding mold corrosion-prone plastic, molding parts should be made of corrosion-resistant materials, or its molding surface should take anti-corrosion measures.
4, mold molding part hardness should not be less than 50HRC, or surface hardening hardness should be higher than 600HV.
Four, top out, reset, pumping core, pick-up
1, top out should be smooth, no stuck, no abnormal sound.
2, the sloped top surface should be polished, the sloped top surface is lower than the core surface.
3, sliding parts should open the oil tank, the surface needs to be nitrided treatment, after treatment surface hardness of HV700 or more.
4, all the top bar should have stop positioning, each top bar should be numbered.
5, the top-out distance to apply the limit block for the limit.
6, the reset spring should be selected standard parts, the spring ends must not be polished, cut.
7, slider, core should have travel limit, small slider with spring limit, spring inconvenient to install the available wave screws;
8, the slider core is generally used oblique guide column, oblique guide column angle should be smaller than the slider locking surface angle of 2 to 3 degrees. The slider travel is too long and should be drawn from the cylinder.
9, cylinder core molding part of the end face is covered, the cylinder should be self-locking mechanism.
10, slider width of more than 150 mm under the large slider should have wear plate, wear plate material should be selected T8A, after heat treatment hardness of HLC50 to 55, wear plate than the large surface 0.05 to 0.1 mm higher, and open the oil tank.
11, the top bar should not be stringed up and down
12, the top bar with a hook, the direction of the hook should be consistent, the hook is easy to remove from the product.
13, the top bar hole and the top bar with the gap, sealing section length, the surface roughness of the top bar hole should be in accordance with the relevant enterprise standards.
14, the product should be conducive to the operator to remove.
15, the top of the product easy to follow the sloped top walk, the top bar should be slotted or corrugated.
16, fixed to the top bar of the top block, should be firm and reliable, the surrounding non-forming part should be processed 3 to 5 degrees slope, the lower perimeter should be angled.
17, the oil road hole on the mold frame should be free of iron debris debris.
18, return rod end face flat, spotless welding. No gaskets at the bottom of the embryo head, spot welding.
19, three plate mold gate plate guide slide smoothly, gate plate easy to pull open.
20, three-plate mold limit lever should be arranged on both sides of the mold installation direction, or outside the mold frame Gala plate, to prevent the limit lever and operator interference.
21, oil road air dud should be smooth, hydraulic top-out reset should be in place.
22, the bottom of the guide sleeve should open the exhaust port.
23, positioning pin installation can not have a gap.
V. Cooling and heating systems
- The cooling or heating system should be fully open.
2, the seal should be reliable, the system under 0.5MPa pressure must not have leakage phenomenon, easy to repair.
3, the size and shape of the sealing groove opened on the mold frame should meet the relevant standard requirements.
4, when the sealing ring should be put on the butter, after place higher than the mold frame surface.
5, water, oil channel partition should be used not susceptible to corrosion of the material.
6, before and after the mold should be centralized water delivery, the way.
Six, pouring system
- Gate settings should not affect the appearance of the product, to meet the product assembly.
2, runner cross-section, length should be designed reasonably, in order to ensure the quality of forming as far as possible to shorten the process, reduce the cross-sectional area to shorten the filling and cooling time, while pouring system loss of plastic should be minimal.
3, the three-plate die runner in the front template on the back of the partial section should be trapezoidal or semi-circular.
4, three plate molds on the gate plate has a breaker, the diameter of the gate inlet should be less than 3mm, the ball head has a recessed gate plate a depth of 3 mm steps.
5, the ball head pull rod should be reliable fixed, can be pressed under the positioning ring, can be fixed with headless screws, can also be pressed with a pressure plate.
6, gate, runner should be in accordance with the drawing size requirements of the machine should be processed, not allowed to manually shake grinding machine processing.
7, point gate gate should be in accordance with the specification requirements.
8, the front end of the sewer should have an extension part as a cold material hole.
9, pull lever Z-shaped refringing should have a sleek transition.
10, the sewer on the parting surface should be circular, the front and rear molds can not be misplaced.
- The latent gate on the top feed bar should have no surface shrinkage.
12, transparent products cold hole diameter, depth should comply with the design standards.
13, the material is easy to remove, the appearance of the product without gate traces, the product assembly no residue.
14, curved lurking gate, two parts of the block should be nitrided treatment, surface hardness reached HV700.
Seven, molding part, parting surface, exhaust tank
1, the front and rear mold surface should not be uneven, pits, rust and other defects affecting the appearance.
2, the block and the mold frame, the rounded corners should be less than 1 mm gap.
3, parting surface to keep clean, clean, no hand grinding wheel grinding to avoid empty, sealing part of the glue no depression.
- The depth of the exhaust tank should be less than the overflow value of the plastic.
5, inserts should be in place, place smoothly, reliable positioning.
6, block, core, etc. should be reliably positioned fixed, round parts have a stop, the block below do not pad copper, iron.
7, the end face of the top bar is consistent with the core.
8, before and after molding part without inverted buckle, angle and other defects.
9, the top of the rib position should be smooth.
10, multi-cavity mold products, left and right parts symmetrical, should indicate L or R, customers on the location and size of the requirements, should meet customer requirements, generally in the appearance and assembly of the place to add, the word size of 1/8.
11, mold frame locking surface research should be in place, more than 75% of the area encountered.
12, the top bar should be arranged closer to the side wall and next to the ribs, boss, and use a larger top bar.
13, for the same parts should be marked number 1, 2, 3 and so on.
14, each encounter through the face, insert face, parting surface should be in place.
15, parting surface sealing part should comply with the design standards. Medium mold below 10 to 20mm, large mold 30 to 50 mm, the rest of the machine to avoid empty.
16, leather and sand blasting should be uniform to meet customer requirements.
17, the appearance of required products, products on the screws should have anti-shrink measures.
18, depth of more than 20 mm screw column should be selected top tube.
19, the wall thickness of the product should be uniform, the deviation is ± 0.15 mm below.
20, the width of the ribs should be in the appearance of the wall thickness of less than 60 percent
21, beveled top, slider on the core should have a reliable way to secure.
22, the front mold inserted into the rear mode or the rear mold inserted into the front mold, around should bent locking and machined to avoid empty.
Eight, injection molding production process
1, mold in the normal injection molding process conditions, should have the stability of injection molding production and process parameters adjusted repeatability.
2, mold injection molding production injection pressure, generally should be less than the injection molding machine rated 85% of the maximum injection pressure. 3, mold injection molding production of injection speed, three quarters of the stroke of the injection speed is not less than 10% of the rated maximum injection speed or more than the rated maximum injection speed of 90%.
4, mold injection molding production pressure should generally be less than 85% of the actual maximum injection pressure.
5, mold injection molding production of lock mold force, should be less than the applicable model rated lock mold force of 90%.
6, injection molding production process, products and water mouth materials to be easy to remove, safe (time generally not more than 2 seconds each).
7, with mosaic products mold, in the production of mosaic installation is convenient, set pieces fixed to be reliable.
Nine, packaging, transportation
1, mold cavity should be cleaned up spray anti-rust oil.
2, sliding parts should be coated with lubricants.
3, gate socket feed port application grease sealing.
4, mold should be installed lock mold, specifications in line with design requirements.
5, spare parts and spare parts should be complete, and with schedule and supplier name
6, mold water, liquid, gas, electricity import and export should take sealing measures to seal to prevent foreign objects from entering;
7, mold outside the surface spray paint, customers have requirements in accordance with the requirements.
8, mold should be used moisture-proof, waterproof, anti-bump packaging, customers have requirements in accordance with the requirements.
9, plastic mold product drawings, structural drawings, cooling heating system drawings, hot drain drawings, spare parts and mold materials supplier details, instructions for use, test mold situation report, factory test certificate, electronic documents should be complete.