Inner cold machining tool for stepped multi-revolution-surface cavity

Abstract

The utility model belongs to the technical field of machining, and particularly relates to a stepped multi-revolution-surface cavity inner cold machining tool which comprises a tool bit and a tool bar, the tool bit comprises a round portion and a blade portion, the round portion is provided with an inner cold hole, a threaded rod is arranged at the rear end of the round portion, the threaded rod is provided with a liquid inlet hole, and a cutting edge is arranged at the bottom end of the blade portion. The blade part is provided with a liquid outlet hole; the cutter bar comprises a first bar body, a second bar body, a third bar body and a fourth bar body, a threaded hole is formed in the front end of the first bar body, six cleaning holes are formed in the first bar body, a deep hole is jointly formed in the four bar bodies, the front end of the deep hole is communicated with the six cleaning holes, and the rear end of the deep hole is communicated with the fourth bar body. And the front end of the deep hole is communicated with the threaded hole and corresponds to the position of the liquid inlet hole of the threaded rod. According to the device, the tool bit and the tool bar are convenient to disassemble and assemble, the machining cost is low, the diameter and the length of the tool bar are of a nonlinear discrete structure, effective avoiding can be conducted during part machining in a part hole, and cutting chips in an inner cavity of the part can be cleaned while machining is conducted.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing, and in particular relates to a step-type multi-rotation surface cavity internal cold processing tool. Background Art

[0002] At present, there are the following difficulties in turning the inner cavity of a stepped multi-rotational surface cavity: (1) The cross-sectional view of the inner cavity of the part is a stepped structure, as shown in the attached figure. Figure 7 As shown in the figure, the diameter of the part entrance is 35mm, and the radius span is 11.5mm within the axial range of 18mm; the radius span is 18mm within the axial range of 49 (67-18) mm; the radius span is 14mm within the axial range of 31.5 (98.5-67) mm; the internal structure of the part is complex, the radius span is large, and the processing is difficult. (2) Conventional Φ25 internal turning tools cannot complete turning, and the through-rod tool holder will interfere with the part during the rotational motion, causing the tool body and the part to collide, which may cause the part to be scrapped at the least, or even damage the machine tool or even personal injury at the worst. (3) If a five-axis machining center or electric pulse machining method is used, the disadvantages of high machining cost and low production efficiency will occur. (4) The metal residue after machining is naturally deposited inside the cavity, causing scratches on the inner wall of the cavity and chip wear on the tool tip under the rotational motion.

[0003] Therefore, there is an urgent need for a stepped multi-rotating surface cavity internal cold machining tool to solve the above problems. Utility Model Content

[0004] In view of the above-mentioned defects in the prior art, the utility model provides a stepped multi-rotating surface cavity internal cold processing tool, including a tool head and a tool rod, the tool head is in the shape of a comma, the material of the tool head is steel 40Cr, and the quenching hardness is HRC38-42 to improve the hardness and wear resistance of the material; the tool head includes an integrally formed circular portion and a blade portion, and the circular portion is located above the blade portion, an internal coolant hole is provided in the center of the circular portion, a threaded rod is provided at the center of the rear end of the circular portion, the threaded rod is provided with a liquid inlet hole connected to the internal coolant hole of the circular portion, a cutting edge is provided at the bottom end of the blade portion, and the blade portion is provided with a liquid outlet hole connected to the internal coolant hole of the circular portion; the radius of the circular portion is 7mm, and the distance from the center of the circular portion to the bottom end of the cutting edge is 26mm, that is, the maximum width of the tool head is 33mm, which is smaller than the diameter of 35mm at the entrance of the part, and can pass through smoothly and enter the hole.

[0005] The tool rod is located at the rear side of the tool head. The material of the tool rod is cemented carbide, and the quenching hardness is HRC32-36 to improve the hardness and strength of the material; the tool rod includes a first rod body, a second rod body, a third rod body and a fourth rod body that are integrally formed, and the first rod body, the second rod body, the third rod body and the fourth rod body are arranged in sequence from front to back, and a threaded hole that is connected to the threaded rod is opened at the front end of the first rod body, and the tool head and the tool rod are connected by threads, so that after the tool head is damaged, it is convenient to disassemble and replace the tool head, reducing the waste of tool costs; six cleaning holes are evenly opened on the first rod body, and a deep hole is jointly opened inside the first rod body, the second rod body, the third rod body and the fourth rod body, and the front end of the deep hole is connected to the six cleaning holes, and the front end of the deep hole is connected to the threaded hole and corresponds to the position of the liquid inlet hole of the threaded rod.

[0006] Optionally, the threaded hole has a diameter of 10 mm.

[0007] Optionally, the diameters of the inner cooling hole, the liquid inlet hole and the liquid outlet hole are all 1 mm.

[0008] Optionally, the diameters of the deep hole and the six cleaning holes are all 1 mm.

[0009] Optionally, the vertical distance from the bottom of the first shaft to the bottom end surface of the cutting edge is 12.5±0.2mm, the vertical distance from the bottom of the second shaft to the bottom end surface of the cutting edge is 19±0.2mm, and the vertical distance from the bottom of the third shaft to the bottom end surface of the cutting edge is 15±0.2mm; the length of the first shaft is 13mm, the length of the second shaft is 47±0.2mm, the length of the third shaft is 34±0.2mm, and the length of the fourth shaft is 110±0.5mm.

[0010] Specifically, the diameter and length of the tool rod are designed with a nonlinear discrete structure, which can effectively avoid partial processing inside the part hole; in addition, the bottom surface and the left and right sides of the fourth rod are milled into 14.5mm wide straight surfaces to facilitate the machine tool to clamp the tool; at the same time, the connection between each rod is designed to be an arc with a radius of 3mm, which can effectively avoid excessive concentration of tool stress points.

[0011] The utility model also includes other components that can enable a stepped multi-rotation surface cavity internal cold working tool to be used normally, which are all conventional technical means in the art. In addition, the devices or components not limited in the utility model all adopt conventional technical means in the art.

[0012] The working principle and beneficial effect of the utility model are to assemble the cutter head and the cutter bar, then fix the cutter on the machine tool, clamp the side and bottom of the fourth rod of the cutter bar to clamp the cutter, and then start turning the part, with low processing cost. The maximum width of the cutter head is 33mm, which is smaller than the diameter of 35mm at the entrance of the part, and can pass smoothly into the hole; the diameter and length of the cutter bar adopt a nonlinear discrete structure design, which can effectively avoid when partially processing in the part hole. The cooling method of the cutter head and the cleaning method of the part hole are mainly determined by the cooling medium used by the power device of the machine tool. If it is coolant, the coolant is introduced into the deep hole of the cutter bar, and the coolant enters the inside of the cutter head through the liquid inlet hole, which can cool the cutter head. The coolant after heat exchange flows out from the liquid outlet hole, and the coolant also flows out from the cleaning hole to realize the cleaning of the chips in the inner cavity of the part while processing; if it is compressed air, compressed air is introduced into the deep hole of the cutter bar. While cooling the cutter head, it can also realize the cleaning of the chips in the inner cavity of the part while processing, which can effectively reduce the scratches on the inner wall of the part cavity and the wear of the cutting edge. When the cutter head is severely worn or damaged, the old cutter head can be removed and replaced with a new one to reduce the waste of tool costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is a structural schematic diagram of the cutter head of the utility model.

[0016] Figure 3 for Figure 2 Sectional view along AA direction

[0017] Figure 4 It is a structural schematic diagram of the knife bar of the utility model.

[0018] Figure 5 for Figure 4 Cross-sectional view along the BB axis.

[0019] Figure 6 for Figure 4 Sectional view along CC direction.

[0020] Figure 7 A schematic diagram of a stepped multi-rotating surface cavity cold machining tool in actual application provided in an embodiment.

[0021] In the figure: 1. cutter head, 2. cutter rod, 3. round part, 4. blade part, 5. inner cooling hole, 6. threaded rod, 7. cutting edge, 8. liquid outlet, 9. first rod shaft, 10. second rod shaft, 11. third rod shaft, 12. fourth rod shaft, 13. threaded hole, 14. cleaning hole, 15. deep hole, 16. parts. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description here is only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent replacements, improvements, etc., should be included in the protection scope of the present invention.

[0023] Example

[0024] like Figure 1-7 As shown, the utility model embodiment provides a stepped multi-rotation surface cavity internal cold working tool, including a tool head 1 and a tool rod 2, the tool head 1 is in the shape of a comma, the material of the tool head 1 is steel 40Cr, and the quenching hardness is HRC38-42 to improve the material hardness and wear resistance; the tool head 1 includes an integrally formed circular portion 3 and a blade portion 4, and the circular portion 3 is located above the blade portion 4, the center of the circular portion 3 is provided with an internal cooling hole 5, and the center of the rear end of the circular portion 3 is provided with a threaded rod 6, and the threaded rod 6 is provided with The circular portion 3 has an inner cooling hole 5 connected to a liquid inlet, and a cutting edge 7 is arranged at the bottom end of the blade portion 4. The blade portion 4 has a liquid outlet 8 connected to the inner cooling hole 5 of the circular portion 3, and the diameters of the inner cooling hole 5, the liquid inlet and the liquid outlet 8 are all 1 mm. In addition, the radius of the circular portion 3 is 7 mm, and the distance from the center of the circular portion 3 to the bottom end of the cutting edge 7 is 26 mm, that is, the maximum width of the cutter head 1 is 33 mm, which is smaller than the diameter of 35 mm at the entrance of the part 16, and can pass through smoothly and enter the hole.

[0025] The tool rod 2 is located at the rear side of the tool head 1. The material of the tool rod 2 is cemented carbide, and the quenching hardness is HRC32-36 to improve the hardness and strength of the material. The tool rod 2 includes an integrally formed first shaft 9, a second shaft 10, a third shaft 11 and a fourth shaft 12, and the first shaft 9, the second shaft 10, the third shaft 11 and the fourth shaft 12 are arranged in sequence from front to back. The front end of the first shaft 9 is provided with a threaded hole 13 that is connected to the threaded rod 6, and the diameter of the threaded hole 13 is 10 mm. The tool head 1 and the tool rod 2 are connected to each other. A threaded connection is adopted between the blade heads 1, so that after the blade head 1 is damaged, it is convenient to disassemble and replace the blade head 1, reducing the waste of tool cost; six cleaning holes 14 are evenly opened on the first shaft 9, and a deep hole 15 is jointly opened inside the first shaft 9, the second shaft 10, the third shaft 11 and the fourth shaft 12, and the diameters of the deep hole 15 and the six cleaning holes 14 are all 1 mm, the front end of the deep hole 15 is connected with the six cleaning holes 14, and the front end of the deep hole 15 is connected with the threaded hole 13 and corresponds to the position of the liquid inlet hole of the threaded rod 6.

[0026] In addition, the vertical distance from the bottom of the first shaft 9 to the bottom end surface of the cutting edge 7 is 12.5±0.2mm, the vertical distance from the bottom of the second shaft 10 to the bottom end surface of the cutting edge 7 is 19±0.2mm, and the vertical distance from the bottom of the third shaft 11 to the bottom end surface of the cutting edge 7 is 15±0.2mm; the length of the first shaft 9 is 13mm, the length of the second shaft 10 is 47±0.2mm, the length of the third shaft 11 is 34±0.2mm, and the length of the fourth shaft 12 is 110±0.5mm.

[0027] It is understandable that the diameter and length of the tool rod 2 are designed with a nonlinear discrete structure, which can effectively avoid partial processing inside the hole of the part 16; in addition, the bottom surface and the left and right side surfaces of the fourth rod body 12 are milled into 14.5mm wide straight surfaces, which is convenient for the machine tool to clamp the tool; at the same time, the connection between each rod body is designed to be an arc with a radius of 3mm, which can effectively avoid excessive concentration of tool stress points.

[0028] The working principle and beneficial effect of the utility model are as follows: the cutter head 1 is assembled with the cutter bar 2, and then the cutter is fixedly installed on the machine tool, and the side and bottom surfaces of the fourth shaft 12 of the cutter bar 2 are clamped to clamp the cutter, and then the part 16 is turned, and the processing cost is low. The maximum width of the cutter head 1 is 33mm, which is smaller than the diameter of 35mm at the entrance of the part 16, and can pass smoothly and enter the hole; the diameter and length of the cutter bar 2 adopt a nonlinear discrete structure design, which can effectively avoid when processing the part in the hole of the part 16. The cooling of the cutter head 1 and the cleaning method of the hole in the part 16 are mainly determined by the cooling medium used by the power device of the machine tool. If it is a coolant, the coolant is introduced into the deep hole 15 of the cutter bar 2, and the coolant enters the inside of the cutter head 1 through the liquid inlet hole, which can cool the cutter head 1. The coolant after heat exchange flows out from the liquid outlet 8, and the coolant also flows out from the cleaning hole 14, so as to realize the cleaning of the chips in the inner cavity of the part 16 while processing; if it is compressed air, the compressed air is introduced into the deep hole 15 of the cutter bar 2, and the chips in the inner cavity of the part 16 can be purged while processing, which can effectively reduce the scratches on the inner wall of the cavity of the part 16 and the wear of the cutting edge 7. When the cutter head 1 is severely worn or damaged, the old cutter head 1 can be removed and replaced with a new one to reduce the waste of tool costs.

[0029] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A stepped multi-rotation surface cavity internal cold working tool, comprising a tool head and a tool rod, characterized in that: The cutter head is in the shape of a comma, and includes an integrally formed circular portion and a blade portion, wherein the circular portion is located above the blade portion, an inner cooling hole is provided at the center of the circular portion, a threaded rod is provided at the center of the rear end of the circular portion, the threaded rod is provided with a liquid inlet hole connected to the inner cooling hole of the circular portion, a cutting edge is provided at the bottom end of the blade portion, and the blade portion is provided with a liquid outlet hole connected to the inner cooling hole of the circular portion; The knife rod is located at the rear side of the knife head, and the knife rod includes an integrally formed first shaft, a second shaft, a third shaft and a fourth shaft, and the first shaft, the second shaft, the third shaft and the fourth shaft are arranged in sequence from front to back, a threaded hole is provided at the front end of the first shaft to cooperate with the threaded rod, six cleaning holes are evenly provided on the first shaft, a deep hole is provided inside the first shaft, the second shaft, the third shaft and the fourth shaft, the front end of the deep hole is connected with the six cleaning holes, and the front end of the deep hole is connected with the threaded hole and corresponds to the position of the liquid inlet hole of the threaded rod.

2. The step-type multi-rotating surface cavity internal cold working tool according to claim 1, characterized in that: The diameter of the threaded hole is 10 mm.

3. The step-type multi-rotating surface cavity internal cold working tool according to claim 2, characterized in that: The diameters of the internal cooling hole, liquid inlet hole and liquid outlet hole are all 1mm.

4. The step-type multi-rotating surface cavity internal cold working tool according to claim 3, characterized in that: The diameter of the deep hole and the six cleaning holes is 1 mm.

5. The step-type multi-rotating surface cavity internal cold working tool according to claim 4, characterized in that: The vertical distance from the bottom of the first shaft to the bottom end surface of the cutting edge is 12.5±0.2mm, the vertical distance from the bottom of the second shaft to the bottom end surface of the cutting edge is 19±0.2mm, and the vertical distance from the bottom of the third shaft to the bottom end surface of the cutting edge is 15±0.2mm; the length of the first shaft is 13mm, the length of the second shaft is 47±0.2mm, the length of the third shaft is 34±0.2mm, and the length of the fourth shaft is 110±0.5mm.

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