For some low-volume or single-piece rapid prototyping manufacturing, turning and milling processing equipment is also very versatile. Because of its ability to control at least one rotary axis, its application range has been expanded, and it can even replace the work of a multi-coordinate linkage CNC machining center.
Stainless steel materials have high toughness, high thermal strength and low thermal conductivity. During milling and turning, the plastic deformation is large, the work hardening is serious, the cutting heat is too much, and the heat dissipation is difficult. This results in high cutting temperature at the tool tip, severe chip adhesion to the cutting edge, and prone to buildup of chip edges, which not only aggravates the wear of the tool, but also affects the surface roughness of the machined surface. In addition, since the chips are not easy to curl and break, it will damage the processed surface and affect the quality of the workpiece. In order to improve the processing efficiency and the quality of the workpiece, how to correctly select the tool material, the geometric parameters of the turning tool and the milling amount are introduced as follows:
CNC machining of stainless steel parts, which is widely used in industry, poses a huge challenge to the tool industry. When developing new turning insert materials and chip-breaking geometries, we must consider their machinability. A group of stainless steel materials that provide a long service life in corrosive environments in the chemical, food, paper and pulp industries are being used more and more. These materials are usually chromium-based iron or carbon steel that provide good corrosion resistance. Other groups of stainless steel materials containing chromium and nickel with different specific gravities are used in the aerospace industry that requires high tensile strength and corrosion resistance. They range from low-nickel alloys with medium processing difficulty to high-temperature alloys with difficult processing.
Problems of CNC turning stainless steel thread and countermeasures
The surface roughness of CNC turning thread is too poor. The most common phenomenon encountered in CNC turning stainless steel threads is: scale-like ripples and knife-biting phenomenon. The reasons for these phenomena are:
(1) The clearance angles of the two sides
What is a nozzle? CNC Machining technology of the nozzle
The nozzle is designed to work under a variety of different spray conditions, so choose the nozzle that suits your needs in order to achieve the best spray performance in use. The characteristics of the nozzle are mainly reflected in the spray type of the nozzle, that is, the shape formed when the liquid leaves the nozzle mouth and its running performance. The name of the nozzle is based on the spray shape divided into fan, cone, liquid column flow (ie jet), air atomization, and flat nozzle. Among them, the cone nozzle is divided into two categories: hollow cone and solid cone; Nozzle is a very key component in many kinds of spraying, oil spraying, sandblasting and other equipment, and it plays an important role.
Although roughing, semi-finishing and finishing of stainless-iron materials on general-purpose machine tools is not too difficult. However, how to solve the problems of high cutting force, high temperature, serious tool wear and low durability, poor surface quality and low productivity in stainless steel cutting on a high-productivity special automatic lathe. It is difficult to meet the requirements of the drawing in one turning operation. In the process of CNC machining martensitic stainless steel materials in our factory: from the selection of tool materials, the selection of tool geometry and structure; Selection of cutting amount; feed state of blank material; Repeated tests have been carried out on the selection of lubricants and coolants, and certain successful experiences have been obtained. Take 3Cr13 stainless iron as an example.
In turning processing components (aluminum, stainless steel, copper, titanium, alloy), especially for finishing, how to choose a tool? Summary of experience of CNC masters:
1. First, determine the entering angle of the tool
In a blink of an eye, I have been operating CNC lathes for more than ten years, and have accumulated some machining skills and experience of CNC lathes. Including turning of different materials (stainless steel, aluminum, copper carbon steel, titanium, cemented carbide, etc.). Due to frequent replacement of processed parts and limited factory conditions, for ten years we have been programming ourselves, setting tools ourselves, debugging and finishing parts processing ourselves. In summary, the operating skills are divided into the following points.
The processing technology of CNC lathe is similar to that of ordinary lathe. However, because the CNC lathe is a one-time clamping, continuous and automatic processing to complete all turning processes. Therefore, the following aspects should be paid attention to:
1. Reasonable choice of cutting amount
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