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The role of the shank in CNC machining

Jun 10, 2019

The engineers at ALLES CNC said that in order to produce good things, the tool holder is very important. Now ALLES CNC is like the introduction of the role of the tool holder in CNC machining.

Click to view the spare parts center of ALLES CNC to learn about the tool holders of ALLES CNC

First, the tool holder plays a role in the mechanical machining of the CNC.

The tool holder connects the mechanical spindle and the tool in machining, which acts as a bridge, which is a function of connecting the upper and lower. The main manifestation of the bearing is that some parameters of the spindle, such as performance, torque and speed, are output through the shank; the embossing is that the shank is to be clamped to achieve normal machining.

Therefore, the role of the shank is very important.


1. The perfect connection between the tool holder and the spindle interface enables the performance to be fully utilized during machining, such as accuracy and life. If the spindle is not well matched with the tool holder, the accuracy of the assembly may exceed the standard range. In the process of processing, the spindle will first react poorly and the noise will be relatively large;


2. When the noise is large, the vibration value will be large. If it is reflected on the tool, the machining accuracy will be worse and the surface finish will be bad. At the same time, it will have an impact on the life of the spindle and the tool. As a result, the company's production efficiency will decrease and the cost will increase.


Second, the main classification and application areas of the tool holder

According to the larger interface, there are two types of general purpose.

One type is the universal interface of 7:24, German standard, national standard and Japanese standard;

The other is the relatively wide 1:10 interface now in use.

Currently 7:24 is universal, 1:10 is the HSK vacuum system tool holder.

There are also some heat-shrinkable, hydraulic, and also include the ultrasound series currently being done.

There are more points in the form of clips.

From the general formula, here is a description of BT, which is 7:24. There are about 5 or 6 kinds according to the standard. For example, the NT class is traditional. In addition, the BT is based on the Japanese standard. There are also national standards. There is also a US standard.

In terms of BT applications, specifications such as 30, 40, and 50 are used extensively for conventional machining. In terms of speed, medium or low speed is used. In terms of load, it is more versatile and can be used in high school and low load. It is mainly used in the market for conventional machining and mold processing, such as precision machining in the electronics and mobile communication industries.


Third, the choice of tool holder follows the machine tool and working conditions.

Due to the variety of tool holders, how to choose the tool holder first depends on the classification and positioning of the enterprise products. What kind of machining is done depends on what kind of machine tool is purchased, and the tool holder follows the interface between the machine tool and the spindle. The machine tool and the spindle are selected, and the approximate type of the tool holder is also determined. If it is rough machining and conventional machining, the general BT type interface is usually selected; if it is finishing, the ISO series small tool holder may be used. Light weight, high speed operation, and HSK series.

For example, if the machine is selected from the BT30 series, then the shank of the BT30 series equipped with the machine tool is selected. Under the BT30 series, there will be many interfaces, and the tools for different interface clamping are different. If it is to be precision machined, it is recommended to select the HSK series collet. There is also a hot-expanding shank in the finishing process, which uses the principle of thermal expansion and contraction to achieve zero-error clamping. The type of tool holder can be determined according to the processing conditions of different companies.

In addition, if the ultrasonic series is not available in some special fields, conventional machining methods will adopt some new types of holders. According to the needs of the market, the tool holders are also developed to meet the needs of the market.

Fourth, the new requirements of the material of different mobile phone structural parts on the tool holder

At present, the development of communication and electronics is very rapid. 3D glass for the mobile phone industry, including mobile phone frame, middle frame, roughing, finishing, high-gloss processing, is also a big challenge.

At present, some new materials (such as liquid metal, ceramic materials, some composite materials involving polymers, titanium alloys, etc.) and new processes have all been applied to the mobile phone industry. The challenge is to design different handles according to different processing areas and processing requirements.

The mobile phone industry has increased requirements for tool holders, such as 3D glass, mobile phone frames and some other frames, which are also divided into finishing, roughing or ultimate processing. When selecting the machine for the machine, the general-purpose machining can be selected to conform to the spindle of the BT30 and BT40 series tool holders. In the finishing of this piece, like the engraving machine, the ISO spindle series is used more, and the higher requirement is the HSK vacuum short-handle high-speed tool holder.

First of all, the material will choose a material with better comprehensive performance;

The second one is more stringent in heat treatment, controlling surface hardness and surface treatment;

In addition, in terms of the performance of the tool holder, in order to cope with the high speed, it is necessary to upgrade a grade in the dynamic balance, and has high requirements on the processing technology in the conventional process.

Therefore, the choice of handles in the mobile phone industry may tend to choose the ISO series. (The ISO series is used in the field of precision machining, featuring high speed and high precision. In addition, HSK also has high precision and high finish.)

The role of the shank in CNC machining

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