Plastic Mold Parts Grinding Technology

A Plastic mold surface grinding of the technicalcountries were mature, in the country have used
requirementsexamples such as the Shanghai Machine Tool Works
1.1 Plastic mold surface grinding of technical indicatorsCo., Ltd. CNC camshaft grinding bed artificial marble
Precision machining and Plastic mold machiningmaterial used to obtain good results. Therefore Plastic
precision represents the different stages ofmold surface grinding machine based on the key parts,
development, usually classified by machining accuracysuch as bed, column, extension units and other
can be divided into general machining, precisionmaterials should be man-made marble.
machining, ultra precision machining three stages.2.3 Precision rotary spindle technology
As the continuous development of productionSpindle is Plastic mold surface grinding one of the key
technology, divided over the limits will gradually movetechnologies, their value requires the following 0.1µm,
forward, past the precision machining of us, today isand its stiffness, thermal expansion, vibration and other
ordinary processing, therefore, the limits of their divisionaspects should have a very good performance.
is relative, and there has been no specific numericalStatic pressure air bearing spindle assembly has the
constant.following advantages: high rigidity, friction Elementary
Precision machining is the machining accuracy ofSchool, a small temperature change, can work under
1-1µm, the surface roughness Ra0.1-0.025µmhigh speed, high precision turning, its precision can reach
process technology; Plastic mold machining is the0.1µm-0.025µm, radial and axial stiffness
machining accuracy is higher than 0.1µm, surface100-300µm between the wear rate is small (close to
roughness is less than 0.025µm Ra processingzero), long life, require little maintenance. Aerostatic
technology, , Plastic mold machining is also known asbearing spindle which will be the first choice for Plastic
sub-micron processing. However, the Plastic moldmold surface grinding.
machining has entered the nano-precision stage, the2.4 micro-feed technology
emergence of nanofabrication and its correspondingIn the Plastic mold surface grinding, grinding wheel of
technologies.micro feed is being processed parts dimensional
According to the present basis for precision grinding,accuracy and surface quality of an important
combined with Plastic mold surface grinding of foreignguarantee. Currently, precision surface grinding process,
technical indicators, the following Plastic mold surfaceits progress to the commonly used "servo motor
grinding machine of technical indicators and technicaland ball screw," the typical purely mechanical
indicators that have been achieved and compared.way, generally can achieve 0.1µm trace feed for the
1.2 Plastic mold surface grinding of the technicallimit. To achieve the required Plastic mold surface
requirementsgrinding 0.1µm-0.01µm and even a smaller
Plastic mold surface grinding of technical indicators, wemicro-feed, the traditional mechanical approach has
can offer Plastic mold surface grinding machinebeen not apply.
technical requirements: vertical feed grinding machineInformation from abroad about the current
to realize micro-feed, the machine has sufficient staticimplementation of trace feed mainly in two ways: First,
and dynamic rigidity, in particular, is the machine'sthe displacement of piezoelectric ceramics, high
thermal deformation and vibration control than theresolution, fast response characteristics, the second is
conventional machine tools should be qualitativethe use of the thermal deformation theory realization
improvement.of micro feed. One piezoelectric ceramic micro-feeding
2 Plastic mold surface grinding method and meansmechanism in use in more common, has been a
As noted above, in order to achieve these technicalsteady feed to 0.01µm trace, which, in the preferred
requirements to achieve the desired specifications, thePlastic mold surface grinding process is used in this
machine's design and specific structure of machineway. Secondly, the Plastic mold surface grinding the
tools, machine tool requirements and the traditionalinitial stage of development, if we use the traditional
greater improvement and enhancement, based on ourmechanical approach to refinement, stability and
experience and precision machining of foreign technicalachieve 0.1µm trace feed and to meet the most
data collection and analysis, combined with surfacePlastic mold surface grinding needs.
grinding machine tool structure, movementSports Guide Type 2.5
requirements, can be machine main unit is divided intoPlastic mold grinding wheel and workpiece is to rely on
the following techniques: (1) machine layout type; (2) therelative motion to achieve, it not only has a precision
use of new materials; (3) precision rotary spindlerotary grinding wheel movement, but also the parts
technology ; (4) micro-feed technology; (5) sports guidewith Plastic mold linear motion, its accuracy should be
type; (6) high-precision temperature control technology.within the 0.1µ/100mm. Which often use static general
2.1 Machine layout patternguide, use the running high precision, non-crawling and
Machine layout type is extremely important, is the keyso on. Static pressure guide is divided into two kinds of
to success and failure, but the Plastic mold grindinghydrostatic and aerostatic. In general, hydrostatic
technology is the development of precision grindingguideway stiffness, function in a grinding machine is
come from abroad has achieved Plastic mold surfacewidely used, but its structure is relatively complex, due
grinding machine to see its structure type variety, bothto oil viscosity shear resistance, the more serious heat,
"grinding first mobile "and also" mobileheat distortion control is relatively difficult. Thus, with
columns "or" Cross mobile extension unitsmore applied aerostatic guide.
", without exception, none of the layout structure2.6 Precision Temperature Control
from the traditional type of machine. From what weOn Plastic mold grinding, the thermal deformation of
know based on high-precision grinding technology thatmachine tool control is extremely important, and this
uses the machine structure, "Cross mobilemachine in the machine layout design process, we
extension units" suitable for Plastic mold surfacemust consider thermal symmetry and thermal stability
grinding machine tool. Because the structure type,and can be considered to be preliminary design of
structure and layout of symmetry with a goodadvanced control.
machine, good thermal stability; main low center ofMachine tool movement on the heat generated by the
gravity moving parts, smooth movement and so on.grinding heat, must be strictly controlled by thermostat
2.2 The use of new materialsmeans, such as oil, used rail bearings air, coolant, etc.,
Plastic rapid prototype China mold Grinding of thermalthe temperature control precision should be less than
deformation of machine vibration control and0.1 oC. Environmental temperature also affect the
demanding. Pieces of material in the machine toolPlastic rapid prototype Shenzhen mold surface grinding
application infrastructure, we should break through thea major factor, consider using multi-temperature
conventional gray cast iron-based principles, with somecontrols, machine tool environment surrounding the
new material, such as: non-metallic materials - resintemperature controlled at 20oC ± 1oC, the near
concrete, the vibration damping materials, heat gradient,ambient temperature should be controlled at around
linear expansion coefficient and other features are20oC ± 0.1oC, but also control of human (operator)
much better than metal. This is used in foreignon the temperature.