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The clamping process is generally divided into three or four stages, generally fast-slow-high pressure; fast clamping, according to the structure of the mold,

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   The effect of plastic viscosity and conditions on viscosityThe nature of the friction between macromolecules when the molten plastic flows is called the viscosity of the plastic. The coefficient of this viscosity is called the viscosity, so the viscosity is a reflection of the fluidity of the molten plastic.

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Safeguards for the appearance of plastic-type molds

one particular: The content of your nameplate should be printed together with the mold amount, mold pounds (KG), and mold size (mm). The characters are all marked with 1/8 ” code, as well as the characters are clear and perfectly arranged.

a couple of: The nameplate ought to be fixed on the mildew and mold leg near the rear format and the guide corner (15mm away from equally sides), set with several rivets, fixed reliably, and not easy to peel off.

3; The cooling drinking water nozzle should use a plastic-type block to insert the nozzle, ￠10 tube, the specification can be G1/8″, G1/4″, G3/8″. Whenever there are particular requirements in the contract, you should follow the agreement.

4: The cooling normal water nozzle ought to extend from the aluminum cnc parts surface, and the head of the water nozzle sunken into the exterior surface should not exceed 3mm.

5: The diameter belonging to the cooling water nozzle elimination hole should be ￠25, ￠30, ￠35mm three specifications, the outer edge within the hole has a chamfer, the chamfer is greater than 1 . 5×45, plus the chamfer is the same.

6th: The a / c water nozzle must have an entry and exit indicate, the inlet water is at, the outlet drinking water is OUT, and the sequence number is added after Out-and-in, such as IN1 and OUT1.

7: Draw English heroes and amounts ought to be capitalized (5/6″), the location is 10mm directly below the tap, the handwriting is clear, beautiful, nice, and evenly spaced.

almost eight: The inlet and outlet nozzles as well as the inlet and outlet nozzles should be the same as the conditioning water valve, and add G (gas) and O (oil) with a bare character just before IN and OUT.

hunting for: There are drinking water nozzles within the upper and lower attributes of the shape installation way, which should end up being built-in, and open the diversion groove or have a support column beneath it meant for protection.

twelve: The lube nozzle or water nozzle that cannot be built-in should be protected by a support steering column.

11: Machining uhmw mold bottom part will need to have a reference direction symbol for each template, made a fortune English DATUM, the word level is 5/16″, the location is definitely 10mm from the side, the writing is very clear, beautiful, cool, and equally spaced.

12: Each web template must have a part number. The number is 10mm from the bottom directly under the reference point of view symbol, and the requirements will be the identical to No . 11.

13: Mold components should affect the lifting and storage for the mold. For example, there should be support legs to protect the ceiling fan oil tank, normal water nozzle, and pre-reset device that outflow underneath during installation.

13: To install the support calf, use screws to pass through the support knee and fix it on the mold base, or to fasten the excessively extended support limb to the mildew base by simply turning external threads.

15: Machining uhmw plastic black mold ejection ditch must meet the specified shot molding machine, except for tiny molds, in principle, a single center can’t be used for ejection (when the distance or thickness of the form is higher than 500mm), the ejection cup diameter ought to be larger than the top The fishing rod is 5-10mm larger.

of sixteen: The placing ring should be reliably set (usually 3 M6 or perhaps M8 hexagon socket screws), the size is generally ￠100 or ￠150mm, 10mm higher than the very best zone. If you will discover special requirements in the deal, the same shall apply.

18: The increasing hole of the positioning wedding ring must be a counterbore, and it is not allowed to get directly attached to the top surface area of the form base.

18: When a custom cnc aluminum mold considering more than 8000KG is installed on the injections molding equipment, the attach should be forced by perforation, and the area must not be shoved separately. In cases where the equipment uses hydraulic fastening molds, twist perforations must also be added to prevent the inability of the hydraulic mechanism.

20: The sprue bushing ball R is usually larger than the nozzle ball R from the injection molding machining.

20: The inlet dimension of the sprue bushing ought to be bigger than the diameter in the nozzle injections port.

twenty-one: The overall measurements of the form must conform to the specified treatment molding machine.

22: The surface of the mold starting will need to have pits, rust represents, unnecessary jewelry, water, gas, oil slots, etc ., and other defects that affect the looks.

23: Every plate of the mold base must have a chamfer greater than 1 . 5mm.

24: The mold should be convenient designed for hoisting and transportation, plus the mold parts should not be disassembled during hoisting ( aside from the important cylinder, which in turn needs to be manufactured separately). The lifting wedding ring interferes with the faucet, oils cylinder, pre-reset rod, etc ., and the position of the moving ring pin could be altered.

25: Every single mold part weighing a lot more than 10KG will need to have a suitable weightlifting eye tooth cavity. If certainly not, corresponding actions must be taken up ensure that the component is easy to disassemble and mount. The size of the ring and the positioning with the ring opening are designed according to the relevant organization standards.

21: If ejector mechanisms such as for example ejector supports and ejector blocks interfere with sliders, and so forth, there has to be a forced pre-reset mechanism, and the very best tag has a reset to zero travel swap.

27: The cylinder key and disposition should be handled by a travel around switch, and the installation is definitely reliable.

twenty eight: The mould oil separator ought to be fixed and trustworthy. The oily fat pipe hooking up the gas separator as well as the oil tube should use a rubber conduit, and the joint should employ standard parts.

29: There has to be trash toenails on the thimble plate. The clamping system should be mounted reliably, with positioning limits, symmetrical unit installation, no less than some (small forms can be 2).

30: In case the injection molding machine switches into an extended nozzle, there must be enough space inside the setting ring to ensure that the expanded nozzle with heating wedding band of the standard injection molding machine can easily extend in.

31: Most inclined surfaces could be removed from a gap that moves through underneath plate plus the thimble lower part plate and whose position is the same as the inclined leading angle.

thirty two: The bottom area of the screw mounting golf hole must be toned. Screws in this article M12 (including M12) should be (12. in search of grade).

1. Wear resistanceWhen the blank is plastically deformed in the mold cavity, it flows and slides along the surface of the cavity, causing severe friction between the surface of the cavity and the blank, which causes the machining uhmw mold to fail due to wear. Therefore, the wear resistance of the material is one of the most basic and important properties of the mold.
Hardness is the main factor affecting wear resistance. In general, the higher the hardness of the mold parts, the smaller the amount of wear and the better the wear resistance. In addition, wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material.
2. StrengthThe working conditions of the molds are mostly very bad, and some of them are often subjected to large impact loads, which leads to brittle fracture. In order to prevent the sudden brittle fracture of precision machining china parts during work, the mold must have high strength and toughness. The toughness of the mold mainly depends on the carbon content, grain size and organization state of the material.3. Fatigue fracture performanceIn the working process of uhmw machining mold, under the long-term action of cyclic stress, it often leads to fatigue fracture. Its forms include low-energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture, and bending fatigue fracture. The fracture performance of the mold mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.
4. High temperature performanceWhen the working temperature of the mold is higher, the hardness and strength will decrease, leading to early wear of the mold or deformation and failure of the machining uhmw plastic. Because the mold material should have high anti-tempering stability, to ensure that the mold has a high hardness and strength at the working temperature.
5. Resistance to cold and heat fatigueSome molds are in a state of repeated heating and cooling during the working process, which causes the surface of the cavity to be pulled and pressure to change the stress, causing surface cracks and peeling, increasing friction, hindering plastic deformation, and reducing dimensional accuracy. Mold failure. Heat and cold fatigue is one of the main forms of failure of hot work molds, and this type of mold should have high resistance to cold and heat fatigue.
6. Corrosion resistanceWhen some molds such as plastic molds are in operation, due to the presence of chlorine and fluorine in the plastic, strong corrosive gases such as hci and hf will be resolved after heating, which will erode the surface of the mold cavity, increase its surface roughness, and aggravate wear failure.

                                    Mold meets process performance requirements

The manufacturing of molds generally involves several processes such as forging, cutting, and heat treatment. In order to ensure the quality of mold manufacturing and reduce production costs, the material should have good forgeability, machinability, hardenability, hardenability and grindability; it should also have small oxidation, decarburization sensitivity and quenching Deformation and cracking tendency.
1. ForgeabilityIt has low hot forging deformation resistance, good plasticity, wide forging temperature range, low tendency of forging cracking and cold cracking and precipitation of networked carbides.
2. Annealing processabilityThe spheroidizing annealing temperature range is wide, the annealing hardness is low, the fluctuation range is small, and the spheroidizing rate is high.
3. MachinabilityThe cutting amount is large, the tool loss is low, and the machined surface roughness is low.
4. Sensitivity to oxidation and decarburizationWhen heated at high temperature, the oxidation resistance is good, the decarburization speed is slow, the heating medium is not sensitive, and the tendency of pitting is small.
5. HardenabilityAfter quenching, it has uniform and high surface hardness.
6. HardenabilityAfter quenching, a deeper hardened layer can be obtained, and it can be hardened by using a mild quenching medium.
7. Tendency of quenching deformation and crackingConventional quenching has small volume change, shape warping, slight distortion, and low tendency of abnormal deformation. Conventional quenching has low sensitivity to cracking, and is insensitive to quenching temperature and workpiece shape.
8. GrindabilityThe relative wear of the grinding wheel is small, and the limit of grinding without burn is large. It is not sensitive to the quality of the grinding wheel and cooling conditions, and it is not easy to cause abrasion and grinding cracks.
Third, the mold meets the economic requirementsWhen selecting materials for the mold, the principle of economy must be considered to reduce the manufacturing cost as much as possible. Therefore, under the premise of satisfying the performance, the first choice is the lower price, carbon steel can be used without alloy steel, and domestic materials can be used without imported materials. In addition, the production and supply of the market should also be considered when selecting materials, and the selected steel grades should be as few and concentrated as possible, and easy to buy.
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The main advantages of PA6 nylon plastic materials:

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Under sunlight, there are striped pigment bands in the productThis question needs to be considered from two aspects: the physical and mechanical properties of the plastic and the plastic molding process:

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High-precision plastic mold processing steps 1. Heating and pre-plasticizing:Driven by the drive system, the screw conveys and compacts the material from the hopper. Under the combined action of the heater, screw and barrel outside the barrel, the material is gradually melted, and the material is gradually melted at the head of the barrel. The part has accumulated a certain amount of molten plastic machining. Under the pressure of the melt, the screw slowly retreats. The retreat distance depends on the amount required for one injection of the metering device to adjust. When the predetermined injection volume is reached, the screw stops rotating and retreats .

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