Machining tool for hole wall surface strengthening and function reconstruction

Abstract

The invention discloses a machining tool for hole wall surface strengthening and function reconstruction, and belongs to the field of machining and surface engineering.The tool comprises a ball, a tool handle, a tool bit and a fixing mechanism; the ball holes are evenly formed in the inner side of the tool bit, the balls are installed in the ball holes, and the fixing mechanism is used for fixing the balls and preventing the balls from falling off from the interior of the tool bit. One or more rows of ball holes are formed in the axial direction of the tool bit, and the ball holes in each row are evenly distributed in the circumferential direction of the tool bit; according to the tool, surface strengthening and function reconstruction are conducted on the hole wall, the ball and the surface of the hole wall are rolled and cut through high-speed rotation of the tool, the surface of the hole wall is rolled, strengthened and reconstructed, the surface of the hole wall obtains low roughness, and therefore the high requirement for machining is met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of mechanical processing, and particularly relates to a processing tool for hole wall surface strengthening and function reconstruction. BACKGROUND

[0002] In mechanical processing, the inner hole of a workpiece often needs to be processed, and milling is a commonly used processing method in the processing of the inner hole of a workpiece. In the milling of the hole of a workpiece, a rough milling cutter head is often used for rough milling, and then a micro milling cutter head is used for micro milling. However, the processing surface after micro milling often cannot meet the surface requirements of specific implementation work. In occasions where the inner hole has high requirements, such as a cylinder and a valve body, the inner hole needs to be surface strengthened after finish machining.

[0003] At present, the roughness, surface hardness and the like of the inner hole of a workpiece processed by a micro milling cutter head cannot meet the requirements of actual application. For example, the surface roughness of a split oil bushing needs to reach a certain precision to realize oil sealing, and the surface roughness of the inner hole needs to reach a certain precision to realize high hardness, high strength and corrosion resistance and the like. At present, although there are some rolling tools to realize surface rolling strengthening, they generally have problems such as complex process, complex structure, long time consumption and the like.

[0004] Therefore, it is necessary to propose a simple and controllable tool which can perform hole wall surface strengthening and function reconstruction to improve the roughness, precision and corrosion resistance and the like of the surface of the inner hole. SUMMARY

[0005] The present application provides a processing tool for hole wall surface strengthening and function reconstruction, which can repeatedly, efficiently and finely roll and cut the hole wall surface, strengthen and reconstruct the function of the hole wall surface, and realize low roughness, high strength and corrosion resistance of the hole wall surface.

[0006] To achieve the above object, the present application adopts the following technical scheme: A processing tool for hole wall surface strengthening and function reconstruction, comprising: a ball, a tool shank, a tool head, a fixing mechanism; the ball hole is uniformly arranged on the inner side of the tool head, the ball is fixed in the ball hole, and the fixing mechanism is composed of a bolt hole and a bolt, wherein the bolt head protrudes out of the tool head.

[0007] The ball hole is arranged in one row or multiple rows along the axial direction of the tool head, and each row is uniformly distributed; the balls are distributed at an interval of 60°, 180° or 120° in the same circumferential direction of the tool head. By adopting the above-mentioned technology, each ball will produce cutting and rolling effect when it contacts the surface of the workpiece, and the uniform arrangement of the balls increases the stability of the tool.

[0008] The bolt is installed in the bolt hole, the bolt rod is vertically inserted into the tool head, and the bolt head slightly protrudes from the tool head. The bolt rod can prevent the ball from falling off the tool head, prevent mechanical damage caused by cutting chips and dust entering the tool head, and ensure that the tool has a certain rigidity.

[0009] Beneficial effects: the application provides a processing tool for hole wall surface strengthening and function reconstruction, which has the following effects compared with the prior art: 1. The centrifugal force generated by the rotation of the tool makes the ball rotate at high speed, and the friction generated by the contact between the ball and the surface to be processed is cut and rolled, so that a lower roughness value is obtained.

[0010] 2. Different arrangement methods of the ball in the tool head expand the accuracy range of tool surface treatment. For example, when two rows of balls are arranged on the tool head along the axial direction, or more balls are arranged in the circumferential direction, the spiral lines generated by the tool processing are denser, so that higher processing accuracy is achieved.

[0011] 3. When the tool rotates, in addition to the revolution of the tool, the ball also rotates in the ball hole, thereby improving the efficiency of the workpiece surface treatment.

[0012] 4. The replacement cost of the tool is reduced. Through the revolution and rotation of the ball, the hole to be processed is subjected to cutting and rolling, and the tool head itself does not contact the material, so that only the ball needs to be replaced to realize the replacement of the tool. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a perspective view of the processing tool in the embodiment of the application, which shows the three-dimensional appearance of a tool. The left side is a three-dimensional view of the tool, and the right side is a three-dimensional rendering view of the tool; Figure 2 is a projection view of the processing tool in the embodiment of the application, which is developed from the end of the tool close to the bolt; Figure 3 is a sectional view of the processing tool in the embodiment of the application, which is formed by taking the plane formed by the centers of the six circular holes of the tool as a section plane; Figure 4 is a half-sectional view of the processing tool in the embodiment of the application, which is developed by taking the axial direction of the tool and the plane passing through the center of the tool as a plane. The upper half is the outer contour of the tool, and the lower half is the section of the tool; Figure 5 is a projection view of the processing tool in the embodiment of the application, which is developed from the bottom end of the tool; Figure 6 is a design method of the ball hole and the ball in the embodiment of the application, which partly embodies the single-row arrangement method and the multi-row arrangement method of the ball hole; In the figure, 1-shank, 2-head, 3-ball, 21-ball hole a, 22-ball hole b, 23-ball hole c, 24-ball hole d, 25-ball hole e, 26-ball hole f, 31-ball a, 32-ball b, 33-ball c, 34-ball d, 35-ball e, 36-ball f, 41-bolt, DETAILED DESCRIPTION

[0014] The application will be further described in detail below in combination with specific embodiments and drawings: The core of the design method of the processing tool for hole wall surface strengthening and function reconstruction is the design of the ball hole, the installation of the ball and the design of other parts: (1) Design of ball hole: The design of the ball hole mainly involves two aspects, one is how many holes are arranged in a single row, and the other is how many rows of ball holes are arranged. For example, Figure 6 The first row shows that six ball holes are arranged in a single row, three ball holes and two ball holes are arranged in a single row, Figure 6 The second row shows the arrangement of the number of ball hole rows, which shows one row and two rows of ball hole arrangements. Let the total number of ball holes be n, the number of ball holes in a single row be n1, the number of ball hole rows be s, and the angle between the ball holes be θ1, then the following formula is satisfied:

[0015] (2) Ball arrangement: The arrangement of the ball also involves two aspects, the first is the arrangement of multiple balls in a single row and the arrangement of several rows of balls. Figure 6 The first row shows three ways of arranging a single row, which shows six balls, three balls and two balls arranged in a single row, Figure 6 The second row shows the arrangement of the number of ball rows, way 1 arranges one row and way 2 arranges two rows. Let the total number of balls be N, the number of balls in a single row be N1, the number of ball rows be S, and the angle between the balls be θ, then the following formula is satisfied:

[0016] (3) Design of other parts: The design size of the tool head diameter is 1.67 mm, and the design size of the tool shank diameter is slightly smaller than the size of the tool head, which is 1.57 mm, similar to the size of the tool of the machine tool, convenient for direct installation and use. The diameter of the bolt head is 0.6 mm. The overall length of the tool is 9 mm, which can meet the processing requirements of most holes. The length of the tool head is 2.3 mm, and the length of the tool shank is 6.5 mm, which realizes the functional strengthening of the hole wall through the axial movement of the tool. The diameter of the ball is 0.4 mm, the diameter of the distal end of the ball hole is 0.4 mm, which ensures that the ball is not radially jumping during installation, and the diameter of the proximal end of the ball hole is 0.27 mm, which is much smaller than the diameter of the ball, so that the ball can only be partially exposed on the outside, and the ball cannot be thrown out under the action of centrifugal force.

[0017] like Figure 1 As shown, a machining tool for surface strengthening and functional reconstruction of hole walls includes a cutting head 2, a tool holder 1, a bolt 41, ball holes, and a ball. The cutting head 2 and the tool holder 1 are located on both sides of the tool and connected to each other. The bolt 41 is inserted vertically into the tool from the cutting head 2. The ball holes af are evenly distributed at the cutting head 2, and the included angle between each ball hole is the same. The ball holes are arranged along the axial direction of the cutting head. The ball is located in the ball hole. Since the diameter of the ball hole is smaller than the diameter of the ball, the ball is not fully exposed on the outside.

[0018] Each ball protrudes 1 mm from the cutter head, the diameter of the cutter head is 2 mm larger than the handle, the cutter head length is 14 mm, and the handle length is 39 mm.

[0019] The entire tool itself achieves the strengthening and reconstruction of the hole wall surface.

[0020] There are various ways to arrange the ball holes (only one example is shown in the figure). To meet the needs of actual processing, the distribution of the ball holes can be adaptively adjusted, including the following two methods: (1) Arrange more or fewer holes in a single row. For example, such as Figure 1 As shown, there are a total of 12 ball holes on the tool's cutting head 2, with six ball holes forming a row. Arranging more or fewer ball holes in the same circumference means that more ball holes can be arranged in each row, with 5 or 7 in a row, but not more than 8. This will weaken the tool's rigidity and reduce its lifespan.

[0021] (2) The number of rows of holes increases or decreases. For example, such as Figure 1 As shown, there are 12 ball holes on the tool's cutting head, with six ball holes arranged in a row, thus the 12 ball holes are distributed along two rows. Arranging more or fewer ball holes around the perimeter refers to increasing or decreasing the number of rows of ball holes. Three, four, or even five rows of ball holes can be arranged, but it is not recommended to have more than eight rows, as the tool's cutting head has a limited length and this would weaken the tool's rigidity.

[0022] There are several ways to arrange the spheres (only two examples are shown in the figure). To meet the needs of actual processing, the distribution of the spheres can be adaptively adjusted, including the following two methods: (1) Install more or fewer balls in a single row, for example, such as Figure 1As shown, a row has six spherical holes. Arranging more or fewer spheres on the same circumference means arranging two spheres, each at a 180° angle, or three spheres, each at a 120° angle, or six spheres, each at a 60° angle, while the second row has no spheres. It is important to note that the spheres in a row should be evenly distributed, meaning the angles between adjacent spheres should be the same. If they are not, when the tool rotates, the inertial force and torque will cause the tool to tilt, resulting in a decrease in machining efficiency.

[0023] (2) The increase or decrease in the number of ball heads, for example, Figure 1 As shown, the tool's cutting head has a total of 12 ball holes. Installing more or fewer balls in different circumferences means that three or six balls can be installed in each row of the tool, or three balls can be installed in the first row and six balls in the second row, but the angle between adjacent balls in the same row should be the same.

[0024] like Figure 2 As shown, a bolt 41 is installed at the cutter head. The bolt structure has a larger diameter near the cutter head and a smaller diameter near the cutter shank, as shown. Figure 4 As shown, bolt 41 prevents the ball from easily falling out of the ball hole inside the cutter head, and also prevents the cutter head from being mechanically damaged by tiny chips during processing, thus protecting the cutter head and the ball.

[0025] When processing the inner wall of a hole with high surface finish requirements, the first step is to mount the tool on the appropriate machine tool. Then, align the tool with the inner hole of the part to be processed. As the tool rotates, the compound cutting tool moves linearly. At this time, the rotation of the tool causes the ball in the hole to revolve at high speed. When the ball contacts the hole wall, the friction between the ball and the hole wall causes the ball to rotate. Under the combined action of the ball's revolution and rotation, the hole wall is cut and rolled, thereby processing the hole wall surface and obtaining higher hole wall surface processing accuracy, lower surface roughness, higher surface strength, and corrosion resistance.

[0026] The above description is only a preferred embodiment of the present invention and is intended to clarify the features of the invention. It is not intended to limit the scope of the invention. Equivalent variations made by those skilled in the art based on the present invention, as well as changes well known to those skilled in the art, should still fall within the scope of the present invention.

Claims

1. A machining tool for surface strengthening and functional reconstruction of hole walls, characterized in that, include: The tool includes a ball, a handle, a cutting head, and a fixing mechanism. The ball holes are evenly distributed inside the cutting head, and the ball is installed in the ball holes. The fixing mechanism is used to fix the ball and prevent it from falling out of the cutting head. It consists of a bolt hole and a bolt, with the bolt head extending out of the cutting head.

2. The machining tool for hole wall surface strengthening and functional reconstruction according to claim 1, characterized in that, The ball holes are arranged in one or more rows along the axial direction of the cutter head.

3. The machining tool for hole wall surface strengthening and functional reconstruction according to claim 2, characterized in that, The ball holes in each row are evenly distributed along the circumference of the cutter head.

4. The machining tool for hole wall surface strengthening and functional reconstruction according to claim 1 or 3, characterized in that, The spheres are evenly distributed along the circumference of the cutter head.

5. The machining tool for hole wall surface strengthening and functional reconstruction according to claim 4, characterized in that, When each sphere is in operation, it produces cutting and rolling effects when it comes into contact with the workpiece surface.

6. The machining tool for hole wall surface strengthening and functional reconstruction according to claim 1, characterized in that, The fixing mechanism includes a bolt hole and a bolt. The bolt is installed in the bolt hole, the bolt shank is vertically inserted into the cutter head, and the bolt head slightly protrudes from the cutter head.

7. The machining tool for hole wall surface strengthening and functional reconstruction according to claim 4, characterized in that, The spheres are distributed at intervals of 60°, 180°, or 120° in the same circumference of the cutter head.

8. The machining tool for hole wall surface strengthening and functional reconstruction according to claim 1 or 2, characterized in that, The distal diameter of the spherical aperture is 0.4 mm, and the proximal diameter is 0.27 mm.

9. The machining tool for hole wall surface strengthening and functional reconstruction according to claim 8, characterized in that, The diameter of the sphere is 0.4 mm.

Images