Composite boring cutter

Abstract

The utility model relates to the technical field of boring cutters, in particular to a composite boring cutter which comprises a cutter handle and a cutter sleeve arranged on the cutter handle in a sleeving mode. An even number of inner hole machining cutters are annularly and evenly distributed at the end of the cutter handle, and an even number of spigot machining cutters are annularly and evenly distributed at the two ends of the cutter sleeve. The tool noses of the inner hole machining tools are arranged back to back, and the tool noses of the spigot machining tools are arranged oppositely. The distance between the spigot machining tools is larger than the distance between the inner hole machining tools. The composite boring cutter can finish boring of a plurality of machining faces at the same time, the number of cutters is reduced, the cutter changing time is shortened, the abrasion of the cutters is reduced, the service life of the cutters is prolonged, meanwhile, the coaxiality error can be effectively reduced, and the workpiece size machining precision is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of boring tools, specifically a composite boring tool. Background Technology

[0002] A boring tool is a cutting tool specifically designed for boring operations. It is mainly used to enlarge existing holes or correct the size and shape of holes. Boring has a strong error correction function, which can correct the axial deviation error of the original hole through multiple passes. Moreover, it can maintain a high positional accuracy between the bored hole and the positioning surface. It is very common in machining and is widely used in various metal or non-metal manufacturing fields.

[0003] For complex components, such as gearbox housings, whose internal structures contain various holes and slots, conventional machining methods use boring and milling cutters, requiring two separate machining steps. This method prolongs machining time when switching tools, resulting in low efficiency. Therefore, some composite milling cutters exist on the market, combining different machining tools onto a single tool to reduce tool change time. The existing technology, "A Composite Milling Cutter" (Publication No.: CN210125761U), integrates multiple tools onto the cutter body to machine parts, saving tool change steps and improving machining efficiency. However, the existing technology still has the following technical problems:

[0004] Existing technology involves fixing multiple different cutting tools onto a tool body. These tools vary in size and weight, and only one of each type is used. This results in asymmetrical tool installation, causing the cutting force of each tool to concentrate at its contact point with the workpiece during machining. This leads to uneven stress on the workpiece, which can easily cause vibration. This not only results in chatter marks on the machined surface but also increases the coaxiality error of the machined area, thus reducing machining accuracy. Furthermore, because the cutting load is borne by a single point on the tool, it also accelerates tool wear and reduces tool life. Utility Model Content

[0005] This invention provides a composite boring tool that can solve the problems of existing composite boring tools causing vibration marks on the cutting surface and large coaxiality errors of the machined parts, thus reducing machining accuracy.

[0006] This application provides the following technical solution: a composite boring tool, including a tool holder and a tool sleeve sleeved on the tool holder;

[0007] The end of the tool holder is evenly distributed with an even number of internal hole machining tools in a ring, and the two ends of the tool sleeve are evenly distributed with an even number of stop machining tools in a ring; the tips of the internal hole machining tools are arranged back to back, and the tips of the stop machining tools are arranged opposite to each other; the distance between the stop machining tools is greater than the distance between the internal hole machining tools.

[0008] Beneficial effects:

[0009] 1. Improve machining accuracy. By evenly distributing the stop-gauge machining tools in a ring on the tool holder and setting the internal hole machining tools in a ring on the tool shank, with an even number of both tools, the tool tips can symmetrically contact the workpiece surface during machining. This results in a more balanced cutting force on the workpiece, reducing vibration and preventing chatter marks on the machined surface. Furthermore, the simultaneous cutting of all machined surfaces effectively reduces coaxiality errors and improves the dimensional accuracy of the workpiece.

[0010] 2. Reduce tool change time, improve machining efficiency, and extend tool life. This application integrates tools for machining different parts into one unit, with the tool tips of the internal hole machining tool facing away from each other and the tool tips of the stop machining tool facing each other. This allows the same tool to simultaneously complete the machining of the workpiece's internal hole and external stop, saving the number of tools, reducing tool change time, and improving machining efficiency. Furthermore, the symmetrical tool design ensures that the cutting load on the tool tip is more evenly distributed, reducing tool wear and extending tool life.

[0011] Furthermore, the internal machining tool includes a first tool body fixed on the tool holder and a first boring tool fixed on the first tool body, with the tips of the first boring tool arranged back to back.

[0012] Beneficial effects: The first boring bar is used to cut the inner wall of the workpiece. The cutting tips of the first boring bar are set back to back, so that when cutting the workpiece, the cutting tips cut off the workpiece material in two symmetrical directions at the same time. Compared with setting a single boring bar, this solution can improve the stress stability of the workpiece, thereby improving the machining accuracy, while saving machining time and improving machining efficiency.

[0013] Furthermore, the stop machining tool includes a second tool body fixed on a tool holder and a second boring tool fixed on the second tool body, with the tips of the second boring tool arranged opposite each other.

[0014] Beneficial effects: The second boring tool is used to cut the annular groove on the outer stop surface of the workpiece. The relative positions of the tool tips of the second boring tool allow the tool tips to simultaneously remove excess workpiece material from the annular groove in two symmetrical directions when cutting the workpiece. Compared with setting a single boring tool, this solution can improve the stress stability of the workpiece, thereby improving the machining accuracy, while saving machining time and improving machining efficiency.

[0015] Furthermore, both the first and second cutter bodies are provided with strip-shaped holes, and both the handle and the sleeve are provided with notched platforms. The first cutter body is fixed to the handle by a screw passing through the strip-shaped hole on the first cutter body, and the second cutter body is fixed to the sleeve by a screw passing through the strip-shaped hole on the second cutter body. The tails of both the first and second cutter bodies are provided with adjusting screws, and the large end of the adjusting screw is provided with a radial through hole.

[0016] Beneficial effects: By fixing the tool body through the slotted hole with a screw, the first and second tool bodies can be axially adjusted. By inserting a tool into the radial through hole of the adjusting screw, the adjusting screw can be turned to adjust the position of the tool tip of the first and second boring tools axially, thereby improving the control over the machining dimensions of the workpiece.

[0017] Furthermore, a first threaded through hole is radially provided on the tool holder, and a second threaded through hole is radially provided on the tool sleeve. Both the first and second threaded through holes are provided with wire thread sleeves, and one end of the wire thread sleeve can contact the first and second tool bodies.

[0018] Beneficial effects: By turning the radially set wire thread sleeve, one end of the wire thread sleeve can be adjusted radially, thereby making radial fine adjustments to the positions of the tool tips of the first and second boring tools, so as to improve the control of the workpiece machining dimensions. Attached Figure Description

[0019] Figure 1 This is the main structural view of the present invention.

[0020] Figure 2 For this Figure 1 The left view.

[0021] Figure 3 for Figure 1 An enlarged view of the second blade.

[0022] Figure 4 This is a schematic diagram of the workpiece being machined using this composite boring tool. Detailed Implementation

[0023] The following detailed description illustrates the specific implementation method:

[0024] The markings in the accompanying drawings include: tool holder 1, tool sleeve 2, second boring tool 3, second tool body 4, wire thread sleeve 5, second threaded through hole 51, strip hole 6, adjusting screw 7, radial through hole 8, notched platform 9, first boring tool 10, first tool body 11, workpiece 12, large screw 13, first threaded through hole 14.

[0025] Example 1

[0026] like Figures 1 to 4As shown, a composite boring tool includes a tool holder 1, a tool sleeve 2 sleeved on the tool holder 1, an internal hole machining tool fixed to the end of the tool holder 1, and a stop machining tool fixed to the end of the tool sleeve 2.

[0027] like Figures 1 to 3 As shown, the tool holder 1 is rod-shaped and preferably made of 40Cr to ensure its strength. Internal machining tools are evenly distributed in a ring at the end of the tool holder 1. Each internal machining tool includes a first tool body 11 fixed to the tool holder 1 and a first boring tool 10 fixed to the end of the first tool body 11. The first tool body 11 has a slotted hole 6, and the tool holder 1 has an L-shaped notch platform 9. One side of the first tool body 11 contacts the plane of the notch platform 9, and then the tool body 11 is fixed to the tool holder 1 by screws passing through the slotted hole 6. The tail of the body 11 is provided with an adjusting screw 7, and the large end of the adjusting screw 7 is provided with a radial through hole 8. The large end face of the adjusting screw 7 abuts against the wall of the notch platform 9. The middle of the tool holder 1 is provided with a first threaded through hole 14 radially. A wire thread sleeve 5 can be provided in the first threaded through hole 14. One end of the wire thread sleeve 5 extends into the first tool body 11 and contacts the first tool body 11. The number of tools for machining the entire inner hole is an even number. In this embodiment, the number is preferably two, and the tips of the first boring tools 10 on the same diagonal are arranged back to back.

[0028] The tool holder 2 is strip-shaped and preferably made of aluminum alloy for lightweight design. After being fitted onto the shank of the tool holder 1, it is fixed with large screws 13. The stop-cutting tools are fixed at both ends of the tool holder 2 and are evenly distributed in a ring. The stop-cutting tools include a second tool body 4 fixed on the tool holder 2 and a second boring tool 3 fixed on the end of the second tool body 4. The second tool body 4 also has a strip-shaped hole 6, and the tool holder 2 also has an L-shaped notch platform 9. One side of the second tool body 4 contacts the plane of the notch platform 9, and then it is fixed by screws passing through the strip-shaped hole 6 on the second tool body 4. On the tool holder 2, the tail of the second tool body is also provided with an adjusting screw 7, and the large end of the adjusting screw 7 is also provided with a radial through hole 8. The large end face of the adjusting screw 7 abuts against the wall surface of the notch platform 9. The outer peripheral wall of the tool holder 2 is provided with a second threaded through hole 51 radially. A wire thread sleeve 5 can be provided in the second threaded through hole 51. One end of the wire thread sleeve 5 extends into the second tool body 4 and contacts the second tool body 4. The total number of stop machining tools is an even number. In this embodiment, the number is preferably two, and the tips of the first boring tool 10 on the same diagonal are arranged opposite each other.

[0029] By inserting a rod-shaped tool into the radial through hole 8 of the adjusting screw 7 and turning the adjusting screw 7, the axial distance of the first tool body 11 or the second tool body 4 can be finely adjusted by relying on the reaction force of the wall surface of the notch platform 9 on the adjusting screw 7. This controls the tip position of the first boring tool 10 and the second boring tool 3. By turning the wire thread sleeve 5, one end of the wire thread sleeve 5 applies a radial force to the first tool body 11 or the second tool body 4, which can finely adjust the tip angle of the first boring tool 10 and the second boring tool 3. This facilitates the dimensional control of the product's machined surface. Furthermore, the large end of the adjusting screw 7 is set to a hemispherical shape, which ensures smooth contact between the adjusting screw 7 and the wall surface of the notch platform 9 when radially adjusting the first tool body 11 or the second tool body 4, preventing jamming.

[0030] In this embodiment, the distance between the second boring tools 3 is greater than the distance between the first boring tools 10, but this distance can be adjusted according to the specific shape of the workpiece 12.

[0031] The usage method of this composite boring tool is as follows:

[0032] like Figure 4 As shown, workpiece 12 is a structural component of a gearbox housing. During machining, Figure 1 The right end of the tool holder 1 is connected to the spindle of the equipment. The spindle drives the entire compound boring tool to rotate and then slowly feeds it axially toward the workpiece 12. The tip of the first boring tool 10 will bore the inner wall of the inner hole of the workpiece 12. When the tip of the first boring tool 10 reaches the bottom arc corner of the inner hole of the workpiece 12, the tip of the second boring tool 3 located on the tool holder 2 will also reach the stop of the boss on the end face of the workpiece 12. The two machining surfaces are completed at the same time. Then the compound boring tool is reset and the workpiece 12 is finished.

[0033] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A composite boring tool, comprising a tool holder and a tool sleeve fitted onto the tool holder; characterized in that: The end of the tool holder is evenly distributed with an even number of internal hole machining tools in a ring, and the two ends of the tool sleeve are evenly distributed with an even number of stop machining tools in a ring; the tips of the internal hole machining tools are arranged back to back, and the tips of the stop machining tools are arranged opposite to each other; the distance between the stop machining tools is greater than the distance between the internal hole machining tools.

2. The composite boring tool according to claim 1, characterized in that: The internal machining tool includes a first tool body fixed on a tool holder and a first boring tool fixed on the first tool body, with the tips of the first boring tool facing away from each other.

3. A composite boring tool according to claim 2, characterized in that: The tool for machining the stop includes a second tool body fixed on a tool holder and a second boring tool fixed on the second tool body, with the tips of the second boring tool arranged opposite each other.

4. A composite boring tool according to claim 3, characterized in that: Both the first and second cutter bodies have strip-shaped holes, and both the handle and the sleeve have notched platforms. The first cutter body is fixed to the handle by a screw passing through the strip-shaped hole on the first cutter body, and the second cutter body is fixed to the sleeve by a screw passing through the strip-shaped hole on the second cutter body. Both the first and second cutter bodies have adjusting screws at their tails, and the large end of the adjusting screw has a radial through hole.

5. A composite boring tool according to claim 4, characterized in that: The tool holder is provided with a first threaded through hole in the radial direction, and the tool sleeve is provided with a second threaded through hole in the radial direction. Both the first threaded through hole and the second threaded through hole are provided with wire thread sleeves, and one end of the wire thread sleeve can contact the first tool body and the second tool body.

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