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How to choose 6 common CNC machine tool holder systems?

2020-05-28 11:05

How to choose 6 common CNC machine tool holdersystems?

The choice of tooling fixture system is one of the important contents in the configuration of CNC machine tools because the tool system not only affects the production efficiency of CNC machine tools but also directly affects the processing quality of parts. According to the performance of the CNC machine tool (or machining center) and the characteristics of the CNC machining process, optimizing the tool and tool holder system can achieve a multiplier effect.

 CNC machine tool holder

1. Classification of common tool holders for CNC machine tools:

Compared with ordinary machining methods, CNC machining has stricter requirements on tool rigidity, accuracy, durability, and dynamic balance performance. The choice of cutting tools should pay attention to the structure and technological analysis of the workpiece, combined with factors such as the processing capacity of the CNC machine tool, the material of the workpiece, and the content of the process.

Commonly used tool holders for CNC machining are mainly divided into drill tool holders, boring tool holders, milling cutter tool holders, threaded tool holders, and straight handle tool holders (end mill tool holders and spring collet tool holders).

LONNZ high-precision tooling fixture

LONNZ high-precision tooling fixture

2. Selection of common tool holders for CNC machine tools:

1. Tool holder structure

The structure of the CNC machine tool holder is divided into two types: integral type and modular type.

The working part of the integrated tool holder for clamping the tool is integrated with the handle part for mounting and positioning it on the machine tool. This tool holder has poor adaptability to the transformation of machine tools and parts. In order to adapt to the change of parts and machine tools, users must reserve tool holders of various specifications, so the utilization rate of tool holders is low.

The modular tool system is a more advanced tool system, and each tool holder can be assembled by various series of modules. For different processing parts and using machine tools, different assembly schemes are adopted to obtain a variety of tool holder series, thereby improving the adaptability and utilization rate of the tool holder.

Lonnz Tools, a professional manufacturer of lathe spring collets, suggests that the choice of tool holder structure should take into account both advanced technology and economical rationality:

①For some simple tools that have been used repeatedly for a long time and do not need to be assembled, it is appropriate to be equipped with an integral tool holder, so that the tool has good rigidity and low price (such as an end mill tool holder, spring collet tool holder and drill used for processing the outer contour of parts Chuck shank, etc.);

②When processing multi-variety and small-batch parts with frequently changing aperture and hole depth, modular tool holders should be used to replace a large number of integral boring tool holders and reduce processing costs;

③Modular tool holders should be used when there are many CNC machine tools, especially when the end of the machine tool spindle and the tool change manipulator are different. Since the intermediate modules (posts) and working modules (knife loading modules) used by each machine tool can be used universally, it can greatly reduce equipment investment and improve tool utilization.

2. Tool holder specifications

Most CNC tool holders use 7:24 conical tool holders, and use the corresponding type of pull nail tensioning structure to match the machine tool spindle. There are various specifications of tool holders, commonly used are No. 40, No. 45, and No . 50. At present, ISO7388-1983, GB10944-1989, MAS403-1982, ANSI / ASME B5.50-1985, etc., which are widely used in our country, should be considered when choosing the tool holder specifications to suit the machine tool spindle and robot.

3. The number of specifications of the tool holder

The integrated TSG tool system includes 20 kinds of tool holders with hundreds of specifications. The user can select the variety of tool holders according to the CNC machining process of the typical parts processed, which can meet the processing requirements without causing a backlog. Considering that a certain number of tool holders are in the process of presetting or tool grinding while the CNC machine tool is working, the number of tool holders is usually 2 to 3 times the required tool holders.

4. Matching of tool and tool holder

Pay attention to the matching of the tool holder and the tool, especially when choosing the tapping tool holder, pay attention to the size of the square head of the tape drive. In addition, the use of single-edge boring tools on CNC machine tools can avoid scratching the workpiece when retiring.

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