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Plastic pattern is fundamental knowledge and skill

Author：ONSON Views：116Post Time：1/9/2018 2:28:20 AM

1, introduction

We produce daily, all sorts of things that use in the day and commodity, arrive greatly crust of the base of the machine tool, airframe, small to screw of an embryo head, button and the crust of all sorts of electric home appliances
In recent years, the flying development as plastic industry and general as plastic as the project the ceaseless progress that waits for a respect in intensity and precision, of plastic finished product use scale also expanding ceaselessly, be like: Appearance of electric home appliances
2, of the mould normally definition: Produce in industry in, the special thing that goes up in compressor with all sorts of compressor and outfit, make metal or metalloid material through pressure a part that wants form or finished product, a general designation of this kind of special thing is a mould.

3, the process that note model clarifies: The mould is one kind produces the thing of plastic finished product. It by a few groups of spare partses some are formed, have inside this combination shape modular antrum. When noting model, mould outfit is placed on the machine that note model, melt is plastic be written shape inside modular antrum, finalize the design in the refrigeration inside antrum, fluctuate next modular space, by top goes out finished product the system from modular antrum top leave a pattern, final mould closes again undertake noting model the next time, all notes model progress undertake circularly.

4, of the mould classify normally: Can divide for plastic mould and blame plastic mould

(1) be not plastic mould to have: Cast a model, forging model, punch model, die-casting model.

A. Cast a model -- channel of faucet, cast iron

B. Forging model -- car body

C. Punch model -- computer face plate

D. Die-casting model -- exceed alloy, cylinder body

(2) plastic mould basis produces craft and produce of commodity different divide again for:

A. Give or take an injection shape model -- pushbutton of television crust, clavier (apply most pervade)

B. The model that blow air -- carefe

C. Compress shape model -- dish of bowl of bakelite switch, scientific china

D. Carry shape model -- integrated circuit finished product

E. Knead hold shape model -- sizy canal, plastic bag

F. Heat shapes model -- brightly lit shapes the crust that pack

G. Rotate shape model -- toy of soft glue doll

Give or take an injection shaping is plastic treatment in most pervade chosen way. This method applies to all thermoplastic plastic originally with some heat the gender is plastic, of the amount of plastic finished product that makes is other shapes greatly of method too far behind to catch up with, as give or take an injection one of main things of processing the mould that note model, in quality the precision, cycle that make and give or take an injection shape the process produces mediumly the field level such as efficiency is concave and convex, what affect the quality of commodity, production value, capital and goods directly is newer, together also resolution is worn the resonant ability in market competition mixes the enterprise speed.

The mould that note model is by a certain number of piece armor plate cooperates all sorts of spare partses comprise, essential component is:

A shapes equipment (sunken model, punch)

Equipment of B fixed position (guide pillar, guide-post bushing)

C secures facility (labour word board, the hole that pile up a model)

D cooling system (carry water hole)

System of E constant temperature (heat canal, calorific line)

System of F flow path (spurt chew aperture, flow path chamfer, flow path aperture)

G top gives a system (thimble, top rod)

5, the basis is pouring system those who make is different can be mould cent 3 kinds:

(1) flood mouth mould: Flow path and runner are on the line that distribute a model, when flying a model with commodity together drawing of patterns, the program is the simplest, machine simply, capital is inferior, so more person selected works with flood mouth system.

(2) mould of fine water mouth: Flow path and runner are not on the line that distribute a model, go up in commodity directly normally, want mouth of water of program much series to distribute modular line so, the program is relatively complex, treatment is harder, should inspect commodity to request normally and choose system of fine water mouth.

(3) mould of warm flow path: Construction of this kind of mould and cardinal principle of fine water mouth are same, its are the biggest distinction is flow path is in the warm current with one or more lukewarm preserving in path board and hot spurt mouth, without cold makings drawing of patterns, flow path and runner are directly on commodity, so flow path does not need drawing of patterns, this system calls anhydrous mouth system again, but managing raw material, apply to raw material the case with higher request of more expensive, finished product, program and treatment are hard, mould capital is taller.

System of warm flow path, call hot runner the system again, basically cover by hot runner, heat up runner board, lukewarm box accusing report is formed. System of our common warm flow path has the odd runner that nod heat and much dot to heat up runner 2 kinds of means. The odd runner that nod heat is to use onefold hot runner to cover direct a melt is plastic shoot model antrum, it is applicable and onefold the plastic pattern of onefold runner has accent; heats up runner at many o'clock is expect melt through heating up runner board ramose to each minutes of heat runner is covered in reentrance arrives model antrum, it applies to single accent many a little bit to enter makings or much antrum mould.

The advantage of system of warm flow path

(1) anhydrous mouth makings, after needing, machine, make all shapes the process is exhaustive automation, managing working hours, ascensive work efficiency.

(2) pressure loss is small. Hot runner temperature shoots mouth temperature to keep balance with the machine that note model, avoided material the exterior condensation picture inside runner, give or take an injection pressure loss is small.

(3) water mouth makings repeats apply can make plastic function degradation, and apply system of warm flow path to expect without water mouth, can cut the loss of raw material, drop next goods capital. Be in model the temperature in antrum and pressure are even, model stress is little, density is even, giving or take an injection lesserly below pressure, shorter shape inside time, note model to go out than normally the commodity with the better system that note model. About brightly lit, thin, large model or tall request model can show its advantage more, and can produce with lesser type give bigger commodity.

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