CNC Router Effective Solution To Mechanical Products In Complex, Sophisticated

- Jun 22, 2017-

CNC machining tool selection and cutting the amount of determination is completed in the human-computer interaction state, requiring programmers must grasp the tool selection and cutting the amount of the basic principles of determining, in the programming to fully consider the characteristics of CNC machining, the correct choice of cutting tools and cutting The CNC processing technology involves a wide range of applications, the characteristics and difficulties of its processing technology is still how high-speed, high efficiency and correct selection of CNC machine tools to produce a technical requirements in line with the technical requirements of CNC machining processes and procedures. CNC machining can greatly shorten the product manufacturing cycle, an effective solution to the mechanical products in the complex, sophisticated, single small batch, the shape of the variable parts processing.

Second, CNC Router tool selection

1. The characteristics and types of the tool

In order to adapt to the high speed, high efficiency and high degree of automation of CNC machine tools, the tool is moving in the direction of standardization, generalization and modularization. It is divided into two categories: milling tool and hole cutting tool. In order to meet the high efficiency and special milling requirements, but also the development of a variety of special purpose special tool.

1) Shank structure

CNC Router tool holder structure is divided into modular and integral two. The modular tool system is a more advanced tooling system, and each tool holder can be assembled from a variety of serialized modules. For different processing parts and machine tools, take a different assembly program, access to a variety of knife handle series, thereby improving the adaptability and utilization of the handle.

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The working part of the overall tool holder tool is integrated with the handle on the machine. This tool holder is less adaptable to the transformation of machine tools and parts. In order to adapt to the transformation of parts and machine tools, the user must reserve a variety of tool holders, so the lower utilization of the handle.

The same time as the above-

CNC Router tool holder and spindle hole with the cone with a 7:24 conical handle, and the use of the corresponding type of pull nails, combined with the machine tool spindle. Taper shank with no self-locking, tool change and so on. Knife handle commonly used specifications are 40, 45 and 50. At present, China is widely used in IS07388-1983.MAS403-1982. ANSI / ASME 135.50-1985, etc., should choose the choice of toolholder specifications and machine tool spindle, the robot to adapt. JT: indicates the use of the international standard IS07388 processing center machine with a taper handle (with a robot holding slot); followed by the corresponding number of ISO taper. BT: indicates the use of the Japanese standard MAS403 processing center machine with a taper handle (with a robot holding slot); followed by the corresponding number of ISO taper. For high-speed cutting commonly used HSK series handle.

In order to improve the processing efficiency, as far as possible the use of high efficiency tool and handle. Selection of strong milling chuck handle, high clamping accuracy, can be used to hold the straight handle tool, because the retainer itself is a small self-locking lock, clamping force, can be used for strong milling; In the high-precision milling reaming work, but also through the rod clamping hole with the tool.

The same time as the above-

Selection of spring chuck handle, buckle elastic deformation of 1mm, the main clamping small size milling cutter, such as drill, cutter, reamer, taps and so on. Selection of modular tool system because of its high positioning accuracy, easy loading and unloading, connection rigidity, with good resistance to vibration, is currently used in a more type, it consists of the handle, the middle pole and the working head. Selection of rough boring can choose double-edged boring tool handle, can improve the processing efficiency, but also help reduce the cutting vibration; for large quantities, processing complex typical parts, should be used as far as possible composite tool. Although the composite tool and the handle price is more expensive, but in the CNC machine tools using composite tool processing, can focus on the process, the multi-channel process into a process, by a tool to complete, help to reduce the processing time and tooling times, Significantly improve production efficiency.

2) CNC Router tool classification

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CNC Router tool classification has a variety of methods, according to the tool structure can be divided into:

① overall type

② mosaic, the use of welding or machine-type connection, machine folder can be divided into translatable and non-translatable two

③ special types, such as composite cutting tools, such as shock absorber.

According to the materials used to make the tool can be divided into:

① high-speed steel tool

② Carbide Tool: Carbide according to the international standard ISO classification, all grades are divided into six categories identified by color, respectively, the letters P, M, K, N, S, H said. P class for the processing of long chip steel; M for the processing of stainless steel; K class for the processing of short chip cast iron; N for the processing of short chips non-ferrous materials; s for the processing of difficult materials Class H is used to process hard materials. Plating carbide cutting tools are divided into: chemical vapor deposition CVD and physical vapor deposition PVD two ⑧ diamond tools ④ ceramic blade materials such as silicon nitride ceramic Si3N4, cubic boron nitride CBN

From the cutting process can be divided into: milling cutter (face milling cutter, end mill, round nose knife, ball cutter, taper cutter) hole processing class tool (twist drill, reamer, boring knife, taps, etc.) The

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In order to meet the requirements of CNC machine tools for tool durability, easy to adjust, stable, and can be changed, machine-type indexable tool can be widely used, accounting for 40% -50% of the entire CNC tool, metal removal accounted for 80% 90%.

2. CNC machining tool selection

The general principle of a tool selection: easy installation and adjustment, good reliability, good rigidity, durability and high precision. In order to meet the processing requirements of the premise, try to choose a shorter tool holder to enhance the rigidity of processing.

1) Select the tool according to the surface size of the workpiece

When selecting a tool, make the size of the tool suitable for the surface size of the workpiece. Production, the processing of flat parts around the contours, often using end mills; milling plane, should be selected carbide cutter cutter. Processing of the boss, the groove, the election of high-speed steel end mills; processing rough surface or hole rough processing, can be used to set the carbide cutter blade corn cutter; for some three-dimensional profile and variable profile contour shape processing, selection Disc cutter, round nose knife, flat knife to do rough processing, the choice of ball cutter, ring cutter, cone cutter to do finishing.

2) Select the tool according to the surface shape of the workpiece

In the mold processing, because the end of the ball tool cutting speed is zero, therefore, in order to ensure the processing accuracy, cutting line spacing generally use the top close, so the ball head cutter is often used for surface finishing. The flat head tool in the surface processing quality and cutting efficiency are better than the ball knife, so, as long as the guarantee is not cut under the premise, whether it is rough surface or finishing, should give priority to the choice of flat knife. In addition, the durability and accuracy of the tool is extremely relevant to the tool price. It must be noted that, in most cases, the choice of good tool increases the tool cost, but the resulting improvement in processing quality and processing efficiency , You can make the whole processing costs greatly reduced.

3) Reasonably arrange the order of the tool

In the process of economic CNC machine tools, due to the wear and tear of the tool, the measurement and replacement are carried out manually and the auxiliary time is long. Therefore, the order of the tool must be arranged reasonably. Generally follow the following principles:

① the process of a set of clamping, the same tool to complete all of its processing steps;

② rough finishing of the tool should be used separately;

③ the first after the hole;

④ first surface finishing, after the two-dimensional contour finishing;

⑤ rational use of CNC machine tool automatic tool change function to improve production efficiency;

⑥ minimize the number of tools.

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