Cutting tool used for metal processing

A cutting tool and metal processing technology, which is applied in the field of metal processing cutting tools, can solve the problems of not being able to provide enough satisfactory fatigue strength and meet the demand, and achieve the effects of simple structure, increased hardness, and convenient manufacture

Inactive Publication Date: 2012-02-01
四川欧曼机械有限公司
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AI-Extracted Technical Summary

Problems solved by technology

[0005] However, although the above-mentioned methods can partially improve the fatigue strength of the material, they still canno...
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Method used

Referring to Fig. 2, Fig. 3, have shown the specific structural representation of the insert seat 11 of the knife holder 1 of cutting tool of the present invention, this insert seat 11 is roughly groove, and its rear end communicates with chip channel 12 to be in cutting It is conducive to the rapid discharge of chips during processing, so as to avoid the impact of chips on the processing process. Each blade seat 11 is provided with a bolt hole, so that the blade 2 is fixed on the blade seat 11 by bolts, and the blade seat 11 is also provided with three support surfaces against the blade 2, which are respectively a cutting support surface 15 and a longitudinal support surface. 16 and a radial support surface 17, wherein the cutting support surface 15 is a support surface along the cutting direction, the longitudinal support surface 16 is a support surface along the axial direction, and the radial support surface 17 is a radial support surface, and the blades 2 are respectively Corresponding to these three support surfaces, there are cutting contact surface, longitudinal contact surface and radial contact surface. Through the design of these three support surfaces, the insert 2 is supported on the insert seat 11 to the maximum extent, thereby providing a wider contact surface. area and better support, preferably, between the cutting support surface 15 and the longitudinal support surface 16 and between the cutting s...
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Abstract

The invention discloses a cutting tool used for metal processing, which comprises a cylindrical tool rest (1) and at least one blade (2), wherein the tool rest (1) is provided with blade bearings (11) for containing at least one blade (2); the rear end of each blade bearing (11) is provided with a cuttings channel (12) which is favorable for cuttings to fall off by the tool rest (1); each blade bearing (11) is a groove and is provided with three supporting surfaces for abutting against the blade (2), wherein the three supporting surfaces are respectively a cutting supporting surface (15), a longitudinal supporting surface (16) and a radial supporting surface (17); and at least one of the longitudinal supporting surface (16) and the radial supporting surface (17) is provided with at least one circular-arc notch (19). The hardness of the material is improved by the design on the tool rest structure, and therefore the tool has high fatigue strength. Meanwhile, material surface polishing is used to lower the possibility of forming fissures. In addition, the cutting tool has the advantages of simple structure and low cost and is convenient to manufacture.

Application Domain

Technology Topic

Metal workingEngineering +5

Image

  • Cutting tool used for metal processing
  • Cutting tool used for metal processing
  • Cutting tool used for metal processing

Examples

  • Experimental program(1)

Example Embodiment

[0019] See figure 1 The cutting tool for metal processing of the present invention includes a cylindrical tool holder 1 and at least one blade 2. The blade 2 may preferably be cemented carbide or other high-hardness materials, and the tool holder 1 has at least one blade 2 At least one blade seat 11 of the tool holder 1 is provided with a chip channel 12 at the rear end of each blade seat 11 that facilitates the falling of chips. The chip channel 12 is preferably a spiral shape consistent with the rotation direction of the tool holder. A circular ring 13 with a diameter larger than the diameter of the tool holder 1 is provided at approximately the middle position of the tool holder 1, and a connecting part 14 connected to the transmission shaft is provided at the rear of the tool holder 1, figure 1 An embodiment of the connecting portion 14 is shown in FIG. The connecting portion 14 may be in a cylindrical shape with cutouts on both sides of the cylinder. Rotational movement is transmitted through the fixing of the cutout by the drive shaft, except figure 1 In addition to the embodiment shown in the embodiment, the connecting portion 14 can also be any shape or component that can be connected, such as a connecting shaft, a hexagonal head, and the like.
[0020] See figure 2 , image 3 , Showing the specific structural schematic diagram of the insert seat 11 of the tool holder 1 of the cutting tool of the present invention. The insert seat 11 is a rough groove, and the rear end of the insert seat 11 is in communication with the chip channel 12 to facilitate the rapid discharge of chips during the cutting process, thereby Avoid the influence of chips on the machining process. Each blade seat 11 is provided with a bolt hole to fix the blade 2 to the blade seat 11 by bolts. The blade seat 11 is also provided with three supporting surfaces against the blade 2, namely the cutting support surface 15 and the longitudinal support surface 16 and the radial support surface 17, wherein the cutting support surface 15 is a support surface along the cutting direction, the longitudinal support surface 16 is a support surface along the axial direction, and the radial support surface 17 is a radial support surface. The blade 2 is respectively Corresponding to these three supporting surfaces are provided with a cutting contact surface, a longitudinal contact surface and a radial contact surface. Through the design of the three supporting surfaces, the insert 2 is supported on the insert seat 11 to the maximum, thereby providing a wider range of contact Area and better support. Preferably, an arc-shaped transition surface 18 is provided between the cutting support surface 15 and the longitudinal support surface 16, and between the cutting support surface 15 and the radial support surface 17. The three supporting surfaces are connected to each other, and the selected arc shape can reduce the stress change between the supporting surfaces, thereby reducing the possibility of cracks and the risk of crack propagation, and further improving the supporting capacity and fatigue strength of the tool holder 1. In order to provide better support, at least one circular arc recess 19 is provided on at least one of the longitudinal support surface 16 and the radial support surface 17, and the circular arc recess 19 is used to accommodate and support the corners of the blade 2. In this way, damage to these corners is avoided. At the same time, through the arrangement of the arc recess 19, when the blade 2 is cutting, a certain plastic deformation accommodation space can be provided for the blade 2, thereby improving the cutting strength and fatigue strength of the blade 2. To improve the supporting capacity of the tool holder 1, it is preferable that at least one arc notch 19 is provided on both the longitudinal supporting surface 16 and the radial supporting surface 17. The design of the tool holder 1 can not only improve the tool holder 1 The fatigue strength and supporting capacity of the tool can also reduce the possible shape of cracks, thereby effectively increasing the cutting ability and fatigue resistance of the tool.
[0021] In order to further improve the fatigue resistance of the tool holder 1, the present invention over-hardens the tool holder 1 so that the hardness of the entire tool holder 1 cross-section reaches 50HRC. At the same time, the material of the tool holder 1 is martensitic steel. The hardness of 1 can be over-hardened by the most commonly used quenching. Due to over-hardening, the density of the entire tool holder 1 is increased, resulting in higher residual stress, introducing more stress, and improving the tool holder 1 fatigue strength.
[0022] After being over-hardened, the surface of the tool holder 1 is subjected to surface treatment to cause the surface to harden. Preferably, it can be achieved by cold working, such as shot peening as described above. Through shot-peening, the internal pressure is formed during over-hardening. After improving the fatigue strength, through good shot peening, the surface gets two additional stress effects, the surface structure is more optimized, the fatigue strength is effectively improved, and the cracks are difficult to spread, and the surface is also well polished.
[0023] Optionally, the surface treatment can also be achieved by other known cold working operations, such as indentation or roller polishing, so as to achieve plastic deformation on the surface of the tool holder 1 and cause compressive stress in the surface area.
[0024] Compared with existing tools, the tool obtained according to the present invention can obtain a significantly improved fatigue strength effect, and at the same time can effectively reduce the occurrence of cracks under high load.
[0025] The advantages of the present invention will be illustrated by specific examples below:
[0026] Three groups of 2234 tool steel were selected for experiment:
[0027] The first group is manufactured in a shape that does not have the transition surface and the notch in the structure of the present invention;
[0028] The second group is manufactured without the shape of the notch in the structure of the present invention;
[0029] The third group: manufacturing is the structure of the invention;
[0030] Experiment with three sets of tools in drilling. Drilling in tool steel 2254. The cutting data is 200m/min and 0.20mm/rev. The tool life is based on the damage of the tool holder body. The result is as follows:
[0031] The first group: an average of 458m;
[0032] The second group: an average of 923m;
[0033] The third group: an average of 1324m;
[0034] It can be seen from the above results that the structural design of the present invention can effectively increase the tool life.
[0035] It is obvious that the above description and record are only examples and are not intended to limit the disclosure, application or use of the present invention. Although the embodiments have been described in the embodiments and described in the drawings, the present invention is not limited to the specific examples illustrated in the drawings and described in the embodiments as the best mode currently considered to implement the teachings of the present invention The scope of the present invention will include any embodiments falling into the foregoing specification and appended claims.
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PUM

PropertyMeasurementUnit
Hardness50.0
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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