Art equipment shapes raw materials in a certain way with its specific shape.
Mold forming has the characteristics of high quality, high output, material saving and low cost.
In all sectors of the national economy, especially automobiles, aerospace, instrumentation,
Machinery manufacturing, household appliances, petrochemical, computer and other industries are extremely successful.
Its wide application. Mold industry has become the foundation of industrial development, and many new products
The development and production of products largely depend on the production of molds. Where's the mold
The key to industrial development is the progress of mold technology, which involves a lot of research.
As a high value-added and technology-intensive product, the technology of mould is cross-cutting.
Technical level has become one of the important symbols to measure the manufacturing level of a country.
Compared with developed countries, China's mold industry started late and has a weak foundation.
There is a big gap. On the whole, the mold T industry in China has developed greatly.
But it still can't meet the needs of the rapid development of domestic economy. The main reason is
Low industrialization and standardization, long manufacturing cycle, low mold precision and long mold life.
Short life span, etc. It still costs a lot of money to import some molds from abroad, especially
Precision, large-scale, complex and long-life molds mainly rely on 12 1. Mention it quickly
There are many problems to be solved to improve the level of mold industry in China. This article wants to be modular.
The product quality was analyzed.
Manufacturing characteristics of L-shaped die
Strictly speaking. Mold manufacturing also belongs to the research category of mechanical manufacturing, but one
Enterprises with strong mechanical manufacturing ability may not be able to undertake the task of mold manufacturing, and it is even more difficult.
Ensure the manufacture of high-quality molds. Because the mold manufacturing is more difficult, compared with the general
Compared with mechanical manufacturing. There are many particularities? 6? 8。
1) requires high manufacturing quality. Mold manufacturing not only requires high machining accuracy, but also
And that quality of the proces surface is required to be good. Generally speaking, the manufacture of the working part of the mold
The tolerance should be controlled within -T -t-O.0 1 mm, and some even require micron specifications.
Inside the shell; The machined surface of the mold is not allowed to have any defects, and it can still work.
Part of the surface roughness R. is required to be less than 0.8 p.m
2) The shape is complex. The working part of the mold is generally a two-dimensional or three-dimensional complex.
Miscellaneous surface is not a simple geometry of general machining.
3) The material has high hardness. The mold is actually equivalent to a machining tool,
It requires high hardness and is generally made of hardened tool steel or cemented carbide.
It is usually difficult to manufacture with traditional processing methods.
4) One-piece production. Mold manufacturing is generally a one-piece production, and the design and manufacturing cycle is relatively long.
At present, there are many processing methods of molds, and the traditional mechanical processing is mold manufacturing.
An indispensable and important processing method. Its advantages are high accuracy and hygiene of adding T.
High productivity. The disadvantage is that the processing speed is slow and hard when processing complex shapes.
It is difficult to add T to materials, and the utilization rate of materials is not high. And CNC machining has high machining accuracy,
The processing quality is stable. High production efficiency, strong adaptability to parts processing, and is beneficial to
The characteristics of production management are widely used in mold production. Numerical control machine tool model
It is widely used, and the machining includes CNC turning, CNC milling and CNC drilling.
Machining, CNC grinding, machining center processing.
2 High-speed milling to improve processing quality
Used for molds with complex contours or curved surfaces, such as injection molds and die-casting molds.
Modulus and so on. Milling plus T. While high-speed milling technology is introduced into mold manufacturing,
Especially the popularization of high-speed milling technology related to hard machining in mold manufacturing industry.
Wide application is a major change in mold manufacturing technology. By high-speed hard milling
The mold under one-time clamping is comprehensively processed, so that high-speed cutting can be applied to the internal machine.
The excitation frequency of the bed is far from the natural frequency range of the T-Art system, which can not only greatly
Reduce the processing time and improve the surface quality and processing accuracy of the plow surface.
Simplify the production process, thus greatly shortening the mold manufacturing cycle and reducing the number of molds.
Production cost of furniture.
Small-diameter (below 12 mm) end mills are most commonly used for high-speed hard milling. primary
There should be double-edged ball-end milling cutter, double-edged circular blade milling cutter, end-tooth hexagonal end milling cutter and installation.
An end mill with two indexable circular blades. Whether ball milling or cylindrical milling is used.
The smaller the tool diameter, the smaller the longitudinal interference. Therefore,
When selecting tool diameter, for T-shaped parts with convex longitudinal profile surface, it should be
According to its workpiece structure, milling cutter strength, stiffness and machining efficiency; correct
For T-shaped parts with concave longitudinal profile, the maximum radius of milling cutter should be less than or equal to the longitudinal direction.
Minimum radius of curvature at the concave contour.
Suitable cemented carbide cutter body, heat-resistant hard coating and negative cutting angle are as follows
Important tool parameters in hard milling. Milling cutters are mainly used in occasions with good toughness.
Fine-grained (0.5-0.8 micron) and ultra-fine-grained (0.2 "0.5 micron).
Made of cemented carbide. The wear resistance of the tool is improved by having high oxidation resistance.
Low internal stress titanium aluminum nitride (TiAIN) or TiAlCN coating to improve the single
The coating thickness is 2 ~ 3 m, and it is painted by PVD process.
The machinability of workpiece materials and tool materials has a direct impact on the selection of cutting parameters. The harder and stronger the workpiece material is, the lower the cutting speed should be.
The cutting speed of hard milling is 90-200m/min. The cutting depth is generally
Take 0. 1-0.4 mm, and the feed speed should be 0.1~ 0.2 mm/r.
During high-speed hard milling, the cutting edge will produce high temperature. If it is used,
When cooled and lubricated by coolant, the microstructure in cemented carbide tool body will be very fine.
Cracks, tools will fail prematurely. So cooling is not suitable for high-speed hard milling.
Liquid-cooled lubrication and hard working should be adopted. But considering the hard grinding
Cutting temperature increases with the increase of workpiece hardness and cutting speed. So in
When the hardness of the workpiece is not very high, high-speed hard milling can also be considered.
Micro lubrication. When the hardness of the workpiece is high, compressed cold air should be used for high-speed hard milling.
Blowing off chips can generally improve the tool life by 20%-30%. Machining die
Rough milling and finish milling should be used as far as possible, and most of them should be removed by high-speed milling.
Divide the material allowance, leave a machining allowance of 0.05 mm near the contour of the finished product, and then adopt
Finish milling with smaller row spacing. High-speed hard milling of dies, due to
Good surface quality, significantly short processing time, short production process and
It is widely used because of its low processing cost. See below/d/%E6% 8f% 90% e9% AB% 98% E6% A8% A1%E5% 85% B7% E5% 8A% A0% E5% B7% A5% E8% B4% A8% E9% 87. Hope to adopt.