Anti-vibration hole machining tool

Abstract

The utility model provides an anti-vibration hole machining cutter, which relates to the technical field of cutters and comprises a cutter bar blade part, a cutter bar handle part and a balancing weight, a cutting groove is arranged in the cutter bar handle part, a central column is arranged at the central position of the cutting groove, the balancing weight is mounted in the cutting groove and sleeved on the central column, and a gap is reserved between the outer surface of the balancing weight and the inner wall of the cutting groove. The length of the balancing weight is smaller than the depth of the cutting groove. By arranging the balancing weight and the cutting groove, when drilling cutting is conducted, cutting vibration generated by the cutter bar blade part is transmitted to the cutter bar handle part, due to the fact that the balancing weight is large in specific gravity and small in diameter of the connecting position of the balancing weight and a cutter, lag and difference exist between the balancing weight and original vibration in the aspects of vibration frequency, direction and size, and therefore part of vibration is counteracted; the problem of structural damage caused by long-time large-amplitude vibration at the joint of the cutter and equipment is solved, and the influence of large vibration on the hole machining precision is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of cutting tools, in particular to an anti-vibration hole processing cutting tool. Background Art

[0002] When traditional drilling tools are used for drilling and cutting, cutting vibrations are generated at the blade, and the vibrations are transmitted to the shank of the tool. Most of the vibrations are transmitted to the equipment. After long-term use, it will cause structural damage to the connection between the tool and the equipment, reduced matching precision, and even affect the hole processing effect. In response to the above defects, this application is proposed. Utility Model Content

[0003] The purpose of the utility model is to provide a vibration-resistant hole machining tool, which solves the problem that the hole machining tool at the current stage vibrates greatly during the machining process and the connection is damaged due to the vibration being transmitted to the equipment.

[0004] In order to solve the above problems, the utility model provides a vibration-resistant hole processing tool. This tool structure is suitable for hole processing tools including but not limited to U drills, twist drills, countersinks, etc., including a tool bar blade, a tool bar handle and a counterweight block. A cutting groove is provided in the tool bar handle, and a center column is provided at the center position of the cutting groove. The counterweight block is installed in the cutting groove and is mounted on the center column. There is a gap between the outer surface of the counterweight block and the inner wall of the cutting groove. The length of the counterweight block is less than the depth of the cutting groove.

[0005] Optionally, the number of blades installed at the cutting edge of the tool rod is several, preferably two blades, and the cutting edge of the tool rod is provided with an external cutting blade and an internal cutting blade, and the external cutting blade and the internal cutting blade are both arranged in the chip groove, and the number of chip grooves is consistent with the number of blades, including the external cutting blade chip groove and the internal cutting blade chip groove.

[0006] According to an embodiment of the present invention, the outer cutting blade and the inner cutting blade are arranged in equal or unequal 180° intervals and are installed at the end of the blade portion of the knife rod.

[0007] According to an embodiment of the present invention, the material specific gravity of the counterweight block is greater than that of the blade and handle of the arbor, and the material of the counterweight block can be copper, cemented carbide, etc.

[0008] According to an embodiment of the present invention, the counterweight is firmly connected to the center column.

[0009] Optionally, the counterweight block and the center column may be connected by interference fit, or by snap connection, welding, or the like.

[0010] Optionally, the cutting groove is a circular hole, and the cross section of the counterweight block is circular. It can also be set as a square hole or a hole of other shapes, and the shape of the counterweight block can be changed accordingly.

[0011] According to an embodiment of the present invention, the radius of the cutting groove is 0.5 to 0.85 times the radius of the tool shank, and the radius of the center column is 0.1 to 0.4 times the radius of the tool shank.

[0012] According to an embodiment of the present invention, the depth of the cutting groove is 0.9 to 1.3 times the length of the shank of the tool bar.

[0013] According to an embodiment of the present invention, the size of the gap between the outer surface of the counterweight block and the inner wall of the cutting groove is 0.5-10 mm.

[0014] According to an embodiment of the present invention, the gap between the counterweight block and the bottom of the cutting groove is 0.5-20 mm.

[0015] The beneficial effect of the present invention is that, by arranging the counterweight block and the cutting groove, the cutting vibration generated by the blade of the tool bar is transmitted to the tool bar handle during drilling and cutting. Since the counterweight block has a large specific gravity and a small diameter at the connection with the tool, there is a lag and difference in the vibration frequency and direction with the original vibration, thereby offsetting part of the vibration, reducing the structural damage problem caused by long-term and large-scale vibration at the connection between the tool and the equipment, and avoiding the influence of large vibration on the hole processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the vibration-resistant hole machining tool;

[0018] Figure 2 Schematic diagram of the end structure of the blade 5 of the shank;

[0019] Figure 3 Schematic diagram of the overall structure of the vibration-resistant hole processing tool. DETAILED DESCRIPTION

[0020] The following description is intended only to disclose the present invention and to enable those skilled in the art to implement the present invention. The embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0021] [Example 1]

[0022] A vibration-resistant hole processing tool. In this embodiment, a U-drill tool is taken as an example. In other embodiments, the structure of this solution can also be applied to other hole processing tools, such as twist drills, countersinks, etc.

[0023] like Figure 1 , including a shank blade 5, a shank handle 6 and a counterweight 7.

[0024] An external cutting blade 1 and an internal cutting blade 2 are installed at the end of the blade portion 5 of the tool bar. The external cutting blade 1 and the internal cutting blade 2 are both arranged in the chip groove. The number of chip grooves is consistent with the number of blades, including the external cutting blade chip groove 3 and the internal cutting blade chip groove 4. The external cutting blade 1 and the internal cutting blade 2 are installed at the end of the blade portion of the tool bar in an equally divided 180° arrangement or an unequally divided arrangement.

[0025] A cutting groove 61 is provided in the shank 6 of the shank, and a center column 62 is provided at the center of the cutting groove 61. The cutting groove 61 is a circular hole. The center column 62 is located at the axis of the shank 6 of the shank and extends along the axis.

[0026] like Figure 1 The radius of the shank 6 is d1, the radius of the cutting groove 61 is d2, and the radius of the center column 62 is d4.

[0027] d2 is 0.5~0.85 times of d1, and d4 is 0.1~0.4 times of d1.

[0028] The length of the shank 6 is L1, and the depth of the cutting groove 61 is L2, which is 0.9 to 1.3 times of L1.

[0029] The counterweight block 7 is a cylindrical structure. The specific gravity of the material of the counterweight block 7 is greater than the specific gravity of the material of the arbor blade 5 and the arbor handle 6. The material of the counterweight block 7 can be copper, cemented carbide, etc.

[0030] The counterweight block 7 is installed in the cutting groove 61 and is mounted on the center column 62. There is a gap between the outer surface of the counterweight block 7 and the inner wall of the cutting groove 61. The inner hole of the counterweight block 7 and the center column 62 are interference fit to achieve a tight connection.

[0031] The size of the gap between the outer surface of the counterweight 7 and the inner wall of the cutting groove 61 is 0.5~10mm. Figure 1 The radius of the counterweight 7 is d3, the radius of the cutting groove 61 is d2, and d2-d3 is the gap size of 0.5~10mm.

[0032] The length of the counterweight block 7 is smaller than the depth of the cutting groove 61 , and the gap size L3 between the counterweight block 7 and the bottom of the cutting groove 61 is 0.5-20 mm.

[0033] When the external cutting blade 1 and the internal cutting blade 2 are drilling, cutting vibration will be generated at the blade 5 of the tool bar, which will be transmitted to the tool bar handle 6; part of it will be transmitted to the counterweight block 7. Since the counterweight block 7 has a large specific gravity and a small diameter at the connection with the tool, there is a lag and difference in the vibration frequency and direction with the original vibration, which helps the blade 5 of the tool bar to offset part of the vibration.

[0034] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended only as examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations and modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. A vibration-resistant hole machining tool, characterized by: The utility model comprises a blade portion (5), a shank portion (6) and a counterweight (7), wherein a cutting groove (61) is provided in the shank portion (6), a center column (62) is provided at the center of the cutting groove (61), the counterweight (7) is installed in the cutting groove (61) and is mounted on the center column (62), a gap is provided between the outer surface of the counterweight (7) and the inner wall of the cutting groove (61), and the length of the counterweight (7) is less than the depth of the cutting groove (61).

2. The vibration-resistant hole machining tool according to claim 1, characterized in that: The blade portion (5) of the shank is provided with an external cutting blade (1), an internal cutting blade (2), an external cutting blade chip removal groove (3), and an internal cutting blade chip removal groove (4).

3. The vibration-resistant hole machining tool according to claim 2, characterized in that: The outer cutting blade (1) and the inner cutting blade (2) are arranged in equal or unequal portions and are mounted on the end of the blade portion (5) of the knife bar.

4. The vibration-resistant hole machining tool according to any one of claims 1 to 3, characterized in that: The material specific gravity of the counterweight block (7) is greater than the material specific gravity of the blade portion (5) and the handle portion (6).

5. The vibration-resistant hole machining tool according to claim 4, characterized in that: The counterweight block (7) and the center column (62) are interference fit.

6. The vibration-resistant hole machining tool according to claim 5, characterized in that: The cutting groove (61) is a circular hole, and the cross section of the counterweight (7) is circular.

7. The vibration-resistant hole machining tool according to claim 5, characterized in that: The radius of the cutting groove (61) is 0.5 to 0.85 times the radius of the tool shank (6), and the radius of the center column (62) is 0.1 to 0.4 times the radius of the tool shank (6).

8. The vibration-resistant hole machining tool according to claim 7, characterized in that: The depth of the cutting groove (61) is 0.9 to 1.3 times the length of the shank (6).

9. The vibration-resistant hole machining tool according to claim 8, characterized in that: The size of the gap between the outer surface of the counterweight (7) and the inner wall of the cutting groove (61) is 0.5-10 mm.

10. The vibration-resistant hole machining tool according to claim 9, characterized in that: The gap size between the counterweight block (7) and the bottom of the cutting groove (61) is 0.5-20 mm.

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