Molding plastic mold cutting
author: time:2014-02-22 source:
In the plastic mold factory manufacturing plastic molds and plastic molds about 90 % of the plastic mold processing by the main
milling, turning, grinding and other machining methods together . After the machine are commonly used equipment , machining
of the workpiece it must leave a little amount of processing for the manual method can not be completed even if the hand is
complete, then the processing is limited only to grinding to obtain an excellent surface quality and carried and polishing.
Whether it is for nitriding steel , surface hardened steel and hardenability of steel , or the pre-hardened steel with tensile strength
of 1500MPa are available now on the market to sell machine tools for machining. However, the most economical or processed
tensile strength between 600 ~ 8000MPa steel . Machining can produce stress , but also to eliminate the residual stress , which
may cause deformation of the workpiece immediately , or deformation after heat treatment , therefore , recommended that after
machining the workpiece is annealed to remove stress . Typically, the deformation caused by the preceding processing for the
subsequent finishing eliminated and finishing processing does not normally produce any stress .
Inserts machined after heat treatment of grinding , polishing, to obtain a high-quality surface , the surface quality of the cavity
determines the ease of molding and demolding the part quality .
Copy cavity surface for molding parts obviously depends on the defective die or melt temperature, injection pressure and
injection speed conditions . Difference between the actual and the ideal surface of the cavity surface , such as wrinkles and rough
surfaces , particularly affecting its optical properties , and forming a recess forming a groove increases the release force required.
Especially if the cavity surface roughness , and the results will scratch the surface of the molded part defects and dull, do not
receive a clear finish. Said surface quality to be given to achieve an average roughness . Mean roughness value depends on the
copy of the application and the properties of the plastic material , or by using a contact measurement method and the template
approach to be visually compared to determine the surface quality of the mold . Only in exceptional circumstances ,
only be measured.
Processing means depending on the machined surface of the workpiece , regardless of how the size of the roughness must be
polished again. As for polishing, until today, people just by means of electric or pneumatic devices , or ultrasonic methods
phone polishing.
For rough surfaces Shuhei three ways: one is to remove material production, the other is to reconfigure the material ,
there is a material increase .
A typical conventional method is to remove the polishing material from the cavity side wall to a flat surface.
Each completed a grinding step , the next step in the move to finer grinding step , the mold must be cleaned thoroughly
grinding down the fine particles with kerosene , the only way to avoid scratching the surface of the mold . The rubbing
direction of each step should be rotated 90 degrees, so that it can be readily seen that , if the grinding is carried completed .
Finally, polishing is generally carried out after quenching , grinding and polishing should all be performed with a very small
coverage area of great pressure .
To date , automatic polishing satisfactory results have not yet been reached. Electropolishing can be formed mirror-like
surface. Glossy surface satin -like luster , which may be due to roughness of about 1um cause peel structure ,
showing the surface of the pores and heteroaryl residue , and maintain ripple.
The cavity may be performed by metal deposition ( electrodeposition or electroless deposition ) finally smoothing process ,
but this method and this method combines the use of mechanical means formed on the surface , not only excellent
mechanical method such as the quality of the polishing method .