Of plastic mould data select

Now, plastic products uses the time when Yu Ping widely increasingly, meantime gives or take an injection shape skill occupies 80 ％ about. Give or take an injection because of,shape firstly second shape, measure is exact, can take insert, productivity tall, finish modernization easily, hind treatment capacity is little wait for characteristic to apply extensively at the car, build, a lot of categories such as electric home appliances
The work requirement of plastic mould and cold die are different, must be normally below C of ° of 150 ° C-200 have operation, besides sufferring sure pressure effect, accept temperature impact even. Now the basis is plastic shape what the mould uses method of condition, treatment is different the basic function request that uses plastic pattern steel induces as follows roughly:

1. Contented outside hardness and wearability

The hardness of plastic pattern is normally under 50-60HRC, the outside hardness with the due and contented mould that passes heat treatment, in order to make sure the model has contented stiffness. The mould wants to accept as a result of plastic stuff and activity in exercise bigger control stress and attrition power, request mould holds to the smooth and steady sex of the precision of appearance and measure precision, ensure the mould has use life contentedly. The wearability of the mould depends on the chemical composition of rolled steel and heat treatment hardness, consequently the hardness of ascensive mould is helpful for progressing its wearability.

2. Admirable cutting processability

Great majority is plastic shape mould, outside be being machined except EMD, still need to undertake sure cutting treatment and benchwork make repairs and supply replacements. Be outspread cutting cutting tool use life, ascensive cutting function, cut down outside surface roughness, plastic mould is necessary with the hardness of steel appropriate.

3. Crackajack polishing function

High quality plastic products, the surface roughness value of request antrum appearance is little. For example, surface roughness of appearance of antrum of the model that note model is worth a request to be less than Ra0.1 ～ the level of 0.25, optical face requests Ra<0.01nm, model antrum must undertake polishing, reduce outside surface roughness to be worth. The rolled steel that chooses for this requests data impurity little, arrangement is imperceptible and even, without fiber hemp should not appear to nod when directional, polish or defect of orange skin condition.

4. Crackajack heat brings stability

Plastic give or take an injection spare parts appearance of the model is compared normally mixed and disorderly, after quenching, machine hard, should choose appliance to have crackajack hot smooth and steady sex as far as possible consequently, after heat treatment of pattern processing classics because linear expansion coefficient is small, heat treatment is out of shape small, the measure change rate that temperature distinction causes is minor, metallographic arrangement and mould measure are smooth and steady, can be cut down or do not undertake machining again, can ensure mould measure precision and outside surface roughness request.

45, the carbon steel of 50 brand has sure intensity and wearability, after be being handled character via tone multi-purpose at mould bases data. Higher intensity and wearability are had after steel of steel of tall carbon tool, low alloy tool passes heat treatment, multi-purpose at shaping spare parts. But steel of tall carbon tool is out of shape because of its heat treatment big, apply to the measure that make only small, appearance shapes briefly spare parts.

Follow the development of plastic industry, the request such as the mixed and disorderly sex of plastic products, precision is taller and taller, also put forward taller request to mould data. About making mixed and disorderly, careful the plastic pattern with corrosion resistance, can use beforehand hard steel (like PMS) , corrosion-resisting steel (like PCR) with steel of effectiveness for a given period of time of low carbon martensite (like 18Ni-250) , the cutting treatment with all be had better, heat treatment and polishing function and relatively high strenth.

In addition, still must think when picking a material prevent abrade and agglutination, if two appearance are put in the circumstance of opposite motion, prevent to pick the material like planning construction as far as possible, plating or nitrogen can use one side to change below special situation, make double mask has different outside construction.




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