{"id":5883,"date":"2023-07-11T13:22:50","date_gmt":"2023-07-11T05:22:50","guid":{"rendered":"https:\/\/parfaite.com\/?p=5883"},"modified":"2024-02-01T08:55:50","modified_gmt":"2024-02-01T00:55:50","slug":"what-is-cnc-tool-holder","status":"publish","type":"post","link":"https:\/\/parfaite.com\/en\/news\/what-is-cnc-tool-holder\/","title":{"rendered":"What is a CNC tool holder ? Understand 3 selection criteria and 3 key technical points"},"content":{"rendered":"

About the CNC Tool handle and what role does it play in CNC machine tools?<\/strong><\/h2>\n\n\n\n

With the demand for machining accuracy and automation, CNC machine tools have been widely used in factories. These machine tools and the tools used come from different places and have different models and standards. This article will give a brief introduction to the field of tool holder , one of the important accessories required in CNC machine tool processing.<\/p>\n\n\n\n

3 Standards for Selecting CNC Tool Holder<\/strong><\/h2>\n\n\n\n

CNC tool holder orTool holder<\/span><\/strong><\/a>The CNC Tool Holder is a \"bridge\" connecting the machine tool spindle and the cutting tool, and is responsible for the important function of connecting the upper and lower. The upper part mainly reflects that some parameters such as the performance, torque, and speed of the spindle are output through the tool holder; the lower part reflects the The tool holder needs to be clamped to achieve normal processing, which is related to the processing accuracy, tool life, and processing efficiency, and affects the final processing quality and processing cost. Therefore, matching the applicability of the knife handle under different processing conditions can give full play to the benefits of getting twice the result with half the effort. Therefore, it is very important to choose a suitable knife handle correctly. Since the requirements of various processing are not the same, the tool holders with different clamping methods are corresponding to it. Here, we briefly introduce the general characteristics of various knife handles as follows.<\/p>\n\n\n\n

To choose a Tool handle correctly, you must first understand its classification method, and there are three ways to distinguish it.1. The specifications of the handle 2. The system of the clamping end 3. The consideration of machining accuracy and function<\/strong><\/p>\n\n\n\n

<\/p>\n\n\n\n

1. Distinguish according to the specifications of the handle; that is, the system in which the spindle of the machine and the handle of the tool handle can be combined.<\/strong><\/p>\n\n\n\n

The shank system is also divided into two categories according to the taper of the spindle hole of the machining center<\/p>\n\n\n\n

HSK vacuum tool holder with a taper of 1:10<\/strong><\/p>\n\n\n\n

\u25cf HSK specification (DIN69893) has A, B, C, D, E, F but the commonly used specification is<\/p>\n\n\n\n

   HSK-A (with keyway) and HSK-E (without keyway)<\/p>\n\n\n\n

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\"HSK\u67c4\u90e8\u61c9\u7528\u7684\u7279\u6027\u8868\"
Table of properties for HSK shank applications<\/figcaption><\/figure>\n<\/div><\/div>\n\n\n\n

Another: SK universal handle with a taper of 7:24<\/p>\n\n\n\n

\u25cf BT specification (JISB6339) has two faces supporting BTT system<\/p>\n\n\n\n

\u25cf SK specification (DIN69871)<\/p>\n\n\n\n

\u25cf CAT specification (ASME B5.50)<\/p>\n\n\n\n

\u25cf ISO specification<\/p>\n\n\n\n

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The above is the type of handle<\/figcaption><\/figure><\/div>\n\n\n\n

2. Distinguish according to the clamping end system; that is, the way the handle clamps the tool.<\/strong><\/p>\n\n\n\n

The clamping method is divided into two categories: direct clamping and collet clamping.<\/p>\n\n\n\n

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Directly clamped are:<\/strong><\/strong><\/p>\n\n\n\n

\u25cf Hydraulic Chuck<\/span><\/a>Also known as hydraulic tool handle<\/strong>The locking method of hydraulic expansion technology is adopted to quickly change the tool, and meet the high-precision requirements of yaw accuracy \u2266 0.003mm, and reduce cutting chatter to improve production efficiency by virtue of damping and vibration reduction performance.<\/p>\n\n\n\n

\u25cf Heat shrinkable knife handle also known asSintered tool holder<\/span><\/a><\/strong>The heat-shrinkable clamping structure is adopted, and the inner hole is expanded by induction heating to clamp the tool, and then cooled to achieve the clamping effect.<\/p>\n\n\n\n

\u25cf Power Milling Chuck Set<\/strong>Yaw accuracy\u22660.01mm, special needle roller design, reduce frictional resistance during locking, super strong clamping force, can avoid tool drop during heavy cutting.<\/p>\n\n\n\n

\u25cf Side-fixed milling cutter holder<\/strong>Side locking tool handle, super clamping force, suitable for all kinds of heavy cutting.<\/p>\n\n\n\n

\u25cf Face Mill Arbor<\/strong>Special tool holder for face milling cutterhead, suitable for face milling.<\/p>\n\n\n\n

Collet clamping (consisting of nut + collet + Tool handle body) are:<\/strong><\/p>\n\n\n\n

\u25cf HER collet Chuck<\/strong>The trapezoidal thread and the unique structural design make the collet produce high rigidity and super strong clamping torque when clamping the tool, and it is highly versatile with the universal ER collet.  <\/p>\n\n\n\n

\u25cf PFK Collet Chuck<\/strong>The collet is designed with a unilateral 4\u00b0 angle and improves the gripping force of the knife handle.<\/p>\n\n\n\n

\u25cf ER collet Chuck<\/strong>Combined with ER collets, it has high versatility and can be used for various processing.<\/p>\n\n\n\n

\u25cf Tap adapter?<\/strong>The handle is specially designed for tapping, with different collets, you can choose rigid tapping or safe torque tapping.<\/p>\n\n\n\n

3. Distinguish according to processing accuracy and function;<\/strong>Due to the different processing procedures and the selection of tool size, the selection of tool handles for heavy cutting or finishing is different. In addition, milling, face milling, drilling, reaming, boring, tapping, and even small diameter interference and edge cleaning The functions of corner trimming are different, so it is necessary to choose the corresponding function of the knife handle to complete<\/p>\n\n\n\n

Discuss 3 key factors affecting the accuracy of Tool handles?<\/strong><\/h2>\n\n\n\n

1.TAPER ACCURACY<\/a>part:<\/strong><\/p>\n\n\n\n

Shank accuracy refers to the tightness tolerance between the handle of the tool handle and the inner hole of the spindle. This tolerance level is divided into 9 levels from AT 1 to AT9 (JIS 1947). The higher the tolerance level of the handle (the smaller the number), the better the handle of the tool handle. The tighter the inner hole of the spindle is. The shank of Yipuhui's knife handle and the inner hole of the spindle are all AT3 or the bonding area is 85%. The tolerances of HSK knife handles are guaranteed to be manufactured in accordance with the tolerance range of DIN69893<\/p>\n\n\n\n

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2. Parts of clamping accuracy and repeatability:<\/strong><\/strong><\/p>\n\n\n\n

Repeat accuracy:<\/strong> The repeatability of the tool holder refers to the amount of change in the clamping precision of each measurement when the tool is repeatedly disassembled or clamped.<\/p>\n\n\n\n

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Direct clamping system<\/strong>The column tool holder directly clamps the tool, so the repeatability of the tool is good when the tool is repeatedly disassembled and assembled.<\/figcaption><\/figure><\/div>\n\n\n\n
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Collet Tool Holder<\/strong>The tool is clamped by collet contraction, so it is important to have high stability and high precision collets (HP and AA) and appropriate clamping torque.<\/figcaption><\/figure><\/div>\n\n\n\n
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Collets and Torque Wrenches<\/figcaption><\/figure>\n\n\n\n

Clamping accuracy:<\/strong> The clamping accuracy of the tool holder refers to the deflection after the tool holder clamps the tool. The measurement method is to clamp the test rod and rotate it 360 degrees at several times the length of the shank diameter and measure its deflection.<\/p>\n\n\n\n

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As shown in the figure, the tool handle clamps the test rod and fixes it on the measuring tool. Take point A as the reference point, rotate 360 \u200b\u200bdegrees, and measure the deflection at point B or point C.<\/figcaption><\/figure><\/div>\n\n\n\n
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Parfaite precision measurement is 4 times the diameter long position (maximum 80mm)<\/figcaption><\/figure><\/div>\n\n\n\n

<\/p>\n\n\n\n

Clamping accuracy and repeatability<\/a>Importance to processing:<\/strong><\/p>\n\n\n\n