Ceramic Mold Life
Molded plastic parts grinding techniques
At the surface of the plastic mold grinding technical requirements
1.1 The surface mold plastic grinding technical indicators
Precision machining of plastic molds and precision machining represents different stages development, generally classified by the precision machining can be divided into general engineering, precision engineering, ultra precision machining three stages.
As the continuous development of production techniques spread over the boundaries slowly forward, beyond the machine precision of us, today is the normal treatment, therefore, the boundaries of his division is relative, and there been no specific numerical constant.
Precision is the accuracy in the preparation of 1-1 microns, the surface roughness, the technology Ra0.1 0.025μm process machining molds plastic machining accuracy is greater than 0.1μm, the surface roughness is less than processing technology 0.025μm Ra, machining plastic molds also known as sub-micron processing. However, machining of plastic mold entered the stage of nano-precision, the emergence of nanofabrication and its technologies concerned.
According to the current base of grinding precision, combined with the surface of the plastic mold grinding foreign technical indicators, monitoring the surface of the plastic mold grinding technical indicators and technical indicators that have been made and compared.
1.2 Moulds plastic surface grinding technical requirements
mold surface plastic grinding technical indicators, we can offer plastic mold surface grinding technical requirements: vertical feed mill to achieve micro-feed, the machine has sufficient static and dynamic rigidity, in particular, is the thermal deformation of the machine and control vibration of conventional machine tools should be qualitative improvement.
2 plastic mold surface grinding method and means
As indicated above, in order to meet these technical requirements to achieve the desired characteristics, the design of the machine and the specific structure machine tools, the requirements of the machine tool and improved and increased more traditional, based on our experience and machining accuracy of data collection and analysis of foreign technical, combined with the grinding surface structure of machine tool, traffic conditions, the unit can be the main engine is divided into the following techniques: (1) the type of machine design, (2) the use of new materials, (3) the technology of precision rotary shaft (4) the technology of micro-feed (5), type of sports orientation, (6) high precision temperature control.
2.1 model available machines
Type of machine design is very important, is the key to success and failure, but the plastic mold grinding technology is the development of precision grinding of the country reached the surface plastic mold grinding machine to see the structure of the standard variety, both "first mobile ground" and also "mobile columns" or "units Cross mobile extension "without exception, nothing in the structure of the traditional type of machine. From what we know on the basis of high precision grinding technology uses the structure of the machine, "the extension of mobile units of the Cross" surface suitable for plastic molds grinding machine tools. Because the type of structure, structure and layout of symmetry with a good machine, good thermal stability, the main center of gravity low parts mobile, steady and so on.
The use of new materials 02.02
plastic molds milling controlling deformation thermal vibrations of machines and demanding. Pieces of material in the application infrastructure of machine tools, we must break the basic principles of classical cast iron, with new equipment, such as non-metallic materials – cement, resin material damping vibration thermal gradient, coefficient of linear expansion and other characteristics are much better than metal. It is used in foreign countries have reached maturity in the country have used examples such as the Shanghai Machine Tool Works Co., Ltd. camshaft base materials, artificial marble CNC milling used to obtain good results. Therefore, the surface of the plastic mold grinding on key elements, such as a bed, column, extenders and other materials should be artificial marble.
Rotation System Precision Technology 2.3
Axis is the surface of milled plastic mold technology key value of 0 .1 μm requires the following, and stiffness, thermal expansion, vibration and other regions should be very good performance.
The static pressure air bearing spindle has the following advantages: high stiffness, friction primary school, a small temperature difference, can work under high speed, high precision turning, precision can reach 0.1μm-0.025μm, radial and axial stiffness 100-300μm between the wear rate is low (near zero), long life, require little maintenance. ball bearing tree that will be the first choice for the plastic mold surface grinding.
2.4 micro-technology food
The plastic mold surface grinding, grinding power microphone is in the process of dimensional accuracy and surface quality of parts of an important safeguard. Today, the area of precision grinding process, its progress to the common use "and screw the servo motor the ball", the purely mechanical type, can usually get food from 0.1μm to trace the limit. To achieve the necessary surface molds 0.1μm 0.01μm plastic flooring and even a small micro-hydro, The traditional approach has been a mechanic not applied.
Information abroad about the current implementation of trace feed mainly in two ways: first, the displacement of piezoelectric ceramic, high-resolution characteristics of rapid reaction the second is the use of the performance of thermal deformation of the theory of microwave power. A piezoelectric ceramic mechanism of micro-nutrition in the most common use has been a constant source of 0.01μm trace on the surface of the plastic mold preferred shredding used in this way. Second, the surface of the plastic mold grinding the initial phase of development, using the traditional approach of mechanical sophistication, 0.1μm stability and achieve trace elements and to conform to any surface mold plastic grinding needs.
Sports Type 2.5 Guide
wheels and the piece of plastic mold is confident of achieving the relative movement, not only has an accuracy of rotation of the wheels but also molds plastic parts with a linear movement, their accuracy should be in 0.1μ/100mm. often uses the static general guide, use high-precision performance, not crawling, and so on. Guide to the static pressure is divided into two types of hydrostatic balloon. In general, hydrostatic guide stiffness, function in a crushing machine is widely used, but its structure is relatively complex due to the shear viscosity of oil, more severe heat, heat distortion control is relatively difficult. Thus, with more applied aerostatic guide.
2.6 Control temperature
In the plastic molds in the grain, the thermal deformation of machine tool control is extremely important, and this machine in the design process of machine design, we must take into account the symmetry thermal and thermal stability and can be considered as design Preliminary advanced control.
movement of the tool machining the heat generated by heat in the grain, must be strictly thermostatically controlled, such as oil, used rail air bags, coolant, etc. The accuracy of temperature control must be less than 0.1 oC. The temperature also affects the surface of the plastic mold in soil an important factor, consider using the control Multi-temperature, the surrounding environment temperature controlled machine tools to 20 º C ± 1 º C, the temperature surrounding environment must be controlled at about 20 º C ± 0.1oC, but also the control of man (operator) of the temperature.
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