A special grinding tool for CNC machine tools

Abstract

The embodiment of the present invention discloses a special grinding tool for CNC machine tools, comprising a sleeve, a spring, an inner shaft, a chassis, and a grinding piece. The sleeve is used to connect to the CNC machine tool; a cavity is provided in the sleeve, and the sleeve is provided with a radially arranged limit hole; the inner shaft extends into the cavity, and a limit piece is fixed to the inner shaft, and the limit piece is located in the limit hole; the chassis is provided at the bottom of the inner shaft, and the spring is sleeved on the surface of the inner shaft, and is used to generate a force on the inner shaft away from the container; the bottom of the chassis is provided with a grinding piece, and the grinding piece is used to grind the workpiece. The present invention can be quickly assembled with the CNC machine tool, and the workpiece can be ground using the CNC machine tool, which expands the function of the CNC machine tool. The structure is exquisite and compact, and it is easy to assemble.

Description

Technical Field

[0001] The present invention relates to a mechanical processing device, in particular to a special grinding tool for CNC machine tools. Background Art

[0002] In the field of mechanical processing, surface defects such as pitting, stains, creases, lines, bruises and scratches on workpieces often require grinding. Since workpieces with surface defects vary in shape and size, and their number fluctuates greatly, the existing method is to use a handheld pneumatic grinder for grinding.

[0003] Existing handheld pneumatic grinders primarily consist of a rotating motor, a rotating shaft, and a grinding head. These motors, shafts, and grinding head are rigidly connected, and grinding pressure, cushioning, and feed are all provided by the human hand. Existing pneumatic grinders require multiple manual grinding cycles to achieve the desired result, resulting in low efficiency and slow operation. Furthermore, varying operator pressure can easily lead to under-grinding or over-grinding. These grinders rely too heavily on feel and experience, making it difficult to ensure consistent grinding quality.

[0004] CNC machine tools perform precision machining, using a drive structure with three or more axes to drive a rotating spindle connected to a tool. To achieve precise workpiece machining, the drive structure uses a rigid connection between a stepper motor and transmission gears to drive the rotating spindle according to a preset machining program. However, grinding the workpiece surface requires a certain degree of flexibility to avoid localized grinding pressure variations caused by surface unevenness, which can affect grinding quality. Therefore, CNC machine tools are difficult to integrate with existing grinders or grinding heads for grinding. Summary of the Invention

[0005] In order to solve the defects of the prior art, the present invention provides a special grinding tool for CNC machine tools, which can be quickly assembled with the CNC machine tool, uses the CNC machine tool to grind workpieces, expands the function of the CNC machine tool, has a sophisticated and compact structure, and is easy to assemble.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a special grinding tool for CNC machine tools, including a sleeve, a spring, an inner shaft, a chassis and a grinding piece, wherein the sleeve is used to be connected to the CNC machine tool; a cavity is provided in the sleeve, and the sleeve is provided with a radially arranged limit hole; the inner shaft extends into the cavity, and the inner shaft is fixed with a limit piece, and the limit piece is located in the limit hole; the chassis is provided at the bottom of the inner shaft, and the spring is sleeved on the surface of the inner shaft, and is used to generate a force on the inner shaft in a direction away from the container; a grinding piece is provided at the bottom of the chassis, and the grinding piece is used to grind the workpiece.

[0007] As an improvement to the above solution, a disc portion is provided at the bottom end of the inner shaft, and the diameter of the disc portion is larger than the diameter of the inner shaft.

[0008] As an improvement to the above solution, a limiting ring is provided in the cavity, and the inner side wall of the limiting ring is used for positioning the inner shaft.

[0009] As an improvement of the above solution, the chassis includes a force transmission layer, a buffer layer and a force application layer arranged in sequence, the force transmission layer is a rigid layer, the buffer layer is elastic, and the force application layer is used to connect with the grinding piece.

[0010] As an improvement to the above solution, a surface of the force-applying layer connected to the grinding piece has a concave-convex structure.

[0011] As an improvement to the above solution, one end of the spring abuts against the bottom of the limiting ring, and the other end abuts against the upper surface of the disc portion.

[0012] As an improvement of the above solution, the inner shaft is provided with an inner shaft hole, and the limiting member includes a limiting body located in the inner shaft hole and extending out of the limiting hole, and limiting end portions located at both ends of the limiting body.

[0013] As an improvement to the above solution, the grinding piece is sandpaper.

[0014] As an improvement to the above solution, a mounting hole is provided at the bottom of the disc portion, and a connector is provided at the top of the chassis. The connector can extend into the mounting hole to fixedly connect the chassis to the inner shaft.

[0015] The implementation of the embodiments of the present invention has the following beneficial effects:

[0016] 1. The above-mentioned grinding tool can be quickly assembled with the CNC machine tool, and the workpiece can be ground using the CNC machine tool, which expands the function of the CNC machine tool. The structure is exquisite and compact, and it is easy to assemble.

[0017] 2. This grinding tool is equipped with a buffer structure mainly composed of a spring sleeved on the inner shaft, which can provide constant grinding pressure on the workpiece and adapt to the working environment of CNC machine tools.

[0018] 3. The chassis includes a force transmission layer, a buffer layer, and a force application layer, which are arranged in sequence. The force transmission layer is a rigid layer, the buffer layer is elastic, and the force application layer is used to connect to the grinding piece. The force transmission layer is a rigid layer made of a hard material, which is used to diffuse the pressure of the disc portion and transmit it evenly downward; the buffer layer can be made of an elastic material such as sponge, which is used to provide the grinding piece with the possibility of tilting and deformation when the surface of the workpiece is uneven; the force application layer can be made of silicone, which is used to cover the lower surface of the buffer layer to form a surface with high tensile strength, preventing the grinding piece from being torn when grinding the raised part of the workpiece, thereby extending the life of the grinding piece.

[0019] 4. The side of the force-applying layer connected to the grinding piece has a wavy concave-convex structure, which can provide uniform point support for the grinding piece. Compared with the planar support, the support points of the point support will be compressed when subjected to the grinding pressure during grinding, forming an elastic compensation structure. When the grinding material on the surface of the grinding piece is partially lost after grinding for a period of time, the support points can extend independently to make up for the loss of grinding material, further ensuring the uniformity and reliability of CNC grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of an embodiment of a special grinding tool for CNC machine tools according to the present invention;

[0021] Figure 2 This is a cross-sectional view of an embodiment of a grinding tool for CNC machine tools according to the present invention;

[0022] Figure 3 It is a cross-sectional view of another embodiment of a grinding tool for CNC machine tools according to the present invention;

[0023] Figure 4 It is a structural schematic diagram of a force-applying layer of an embodiment of a special grinding tool for CNC machine tools of the present invention. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear herein are based solely on the accompanying drawings and are not intended to limit the present invention.

[0025] like Figure 1 and Figure 2As shown, a specific embodiment of the present invention provides a special grinding tool for CNC machine tools, including a sleeve 1, a spring 2, an inner shaft 3, a chassis 4 and a grinding piece 5. The sleeve 1 is used to connect with the CNC machine tool; a cavity 11 is provided in the sleeve 1, and the sleeve 1 is provided with a radially arranged limiting hole 12; the inner shaft 3 extends into the cavity 11, and the inner shaft 3 is fixed with a limiting piece 6, and the limiting piece 6 is located in the limiting hole 12; the chassis 4 is provided at the bottom of the inner shaft 3, and the spring 2 is sleeved on the surface of the inner shaft 3, and is used to generate a force on the inner shaft 3 in a direction away from the container; a grinding piece 5 is provided at the bottom of the chassis 4, and the grinding piece 5 is used to grind the workpiece. As shown Figure 2 As shown, one end of the sleeve 1 connected to the CNC machine tool can be sealed, and the sealing design can increase the strength of the sleeve 1 and reduce the elastic deformation of the sleeve 1. Figure 3 As shown, one end of the sleeve 1 connected to the CNC machine tool can also be hollow. The hollow design can reduce the weight of the sleeve 1 and can also meet the needs of some CNC machine tools to extend the spindle into the hollow part of the sleeve 1 for connection.

[0026] The grinding tool can be quickly assembled with a CNC machine tool, and the workpiece can be ground using the CNC machine tool, thereby expanding the function of the CNC machine tool. The structure is exquisite and compact, and it is easy to assemble.

[0027] Preferably, a disc portion 31 is provided at the bottom end of the inner shaft 3, the diameter of which is larger than that of the inner shaft 3. A retaining ring 13 is provided within the cavity 11, the inner sidewall of which serves to position the inner shaft 3. The retaining ring 13 prevents the inner shaft 3 from tilting during extension and retraction, which could affect the coaxiality between the inner shaft 3 and the sleeve 1 and affect the uniformity of the polishing process.

[0028] Grinding is performed using a CNC machine tool, and the grinding feed can be precisely controlled by the machine. However, during the grinding process, the state of the grinding element 5 changes with the surface of the workpiece being ground. To provide uniform and constant support for the grinding element 5 during the grinding process, the chassis 4 includes a force transmission layer 41, a buffer layer 42, and a force application layer 43, arranged in sequence. The force transmission layer 41 is a rigid layer, the buffer layer 42 is elastic, and the force application layer 43 is connected to the grinding element 5. The force transmission layer 41 is a rigid layer made of a hard material, which diffuses the pressure from the disc portion 31 and evenly transmits it downward. The buffer layer 42 can be made of an elastic material such as sponge, which allows the grinding element 5 to tilt and deform when the workpiece surface is uneven. The force application layer 43 can be made of silicone, which covers the lower surface of the buffer layer 42, forming a surface with high tensile strength. This prevents the grinding element 5 from cracking when grinding the protruding parts of the workpiece, thereby extending the life of the grinding element 5. The grinding element 5 can be sandpaper.

[0029] Combine Figure 4 As shown, preferably, the side of the force-applying layer 43 connected to the grinding piece 5 has a concave-convex structure. More preferably, the side of the force-applying layer 43 connected to the grinding piece 5 has a wavy concave-convex structure 431. The wavy concave-convex structure 431 can provide uniform point-type support for the grinding piece 5. Compared with planar support, the support points of point-type support will be compressed when subjected to grinding pressure during grinding, forming an elastic compensation structure. When the grinding material on the surface of the grinding piece 5 is partially lost after grinding for a period of time, the support points can independently extend to compensate for the loss of grinding material, further ensuring the uniformity and reliability of CNC grinding.

[0030] Since CNC machine tools do not have their own buffer mechanism, this design adds a buffer structure, which is mainly composed of a spring 2 mounted on the inner shaft 3. One end of the spring 2 abuts the bottom of the limit ring 13, and the other end abuts the upper surface of the disc portion 31. When the sleeve 1, which is fixedly connected to the rotating shaft of the machine tool, drives the inner shaft 3 to descend and the grinding member 5 abuts the workpiece being ground, the downward stroke of the inner shaft 3 is blocked, and the sleeve 1 continues to move downward relative to the inner shaft 3. The pressure applied by the inner shaft 3 to the workpiece being ground is provided by the spring 2.

[0031] Preferably, the inner shaft 3 is provided with an inner shaft hole 32 , and the limiting member 6 includes a limiting body 61 located in the inner shaft hole 32 and extending out of the limiting hole 12 , and limiting end portions 62 located at both ends of the limiting body 61 .

[0032] To facilitate quick replacement of the chassis 4, a mounting hole 311 is provided at the bottom of the disc portion 31, and a connector 44 is provided at the top of the chassis 4. The connector 44 can be inserted into the mounting hole 311 to securely connect the chassis 4 to the inner shaft 3. Preferably, the mounting hole 311 is a threaded hole, and the connector 44 is a stud that is screwed into the threaded hole to securely connect the disc portion 31 to the chassis 4.

[0033] The working principle of this grinding tool is as follows:

[0034] 1. Fix the sleeve 1 of the grinding tool on the rotating shaft of the CNC machine tool, control the rotating shaft to move above the workpiece to be ground, and lower the rotating shaft until the grinding piece 5 contacts the surface of the workpiece.

[0035] 2. The rotating shaft continues to descend, causing relative displacement between the sleeve 1 and the inner shaft 3. The limiting element rises in the limiting hole 12 along with the inner shaft 3, and the spring 2 is compressed to form grinding pressure.

[0036] 3. The rotating shaft rotates, driving the sleeve to rotate. The inner shaft 3 rotates synchronously with the sleeve under the drive of the limiter 6, and the grinding piece 5 grinds the surface of the workpiece. During the grinding process, the spring 2 is used to provide the overall pressure preset by the process. The pressure is transmitted to the buffer layer 42 through the force transmission layer 41. When the surface of the workpiece is uneven, the buffer layer 42 provides space for local deformation of the grinding piece 5 to ensure that all the concave and convex parts of the workpiece surface can be ground; at the same time, the force transmission layer 41 is used to protect the lower surface of the buffer layer 42. At the same time, as a reinforcement structure of the grinding piece 5, it can provide a reinforcement function for the base material when the grinding piece 5 rotates and moves on the three-dimensional surface of the workpiece, which can not only ensure that the grinding piece 5 can reasonably deform to fit the surface of the workpiece, but also prevent the grinding piece 5 from being torn when passing through the concave and convex surface during high-speed rotation. The above structures cooperate with each other to complete the automatic grinding work of the CNC machine tool on a flat or non-flat surface.

[0037] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A special grinding tool for CNC machine tools, characterized in that: It includes a sleeve, a spring, an inner shaft, a chassis and a grinding piece, wherein the sleeve is used to connect with a CNC machine tool; The sleeve is provided with a cavity, and the sleeve is provided with a radially arranged limiting hole; The inner shaft extends into the cavity, and a limiting member is fixedly provided on the inner shaft, and the limiting member is located in the limiting hole; The chassis is arranged at the bottom of the inner shaft, and the spring is sleeved on the surface of the inner shaft, and is used to generate a force on the inner shaft in a direction away from the cavity; A grinding piece is provided at the bottom of the chassis, and the grinding piece is used to grind the workpiece; The chassis comprises a force transmission layer, a buffer layer and a force application layer which are arranged in sequence, wherein the force transmission layer is a rigid layer, the buffer layer is elastic, and the force application layer is used to connect with the grinding element; The force-applying layer has a concave-convex structure on one side connected to the grinding piece; The bottom end of the inner shaft is provided with a disc portion, and a limiting ring is provided in the cavity. One end of the spring abuts against the bottom of the limiting ring, and the other end abuts against the upper surface of the disc portion; The grinding piece is sandpaper.

2. The CNC machine tool grinding tool according to claim 1, wherein: The diameter of the disc portion is larger than the diameter of the inner shaft.

3. The CNC machine tool-specific grinding tool according to claim 2, wherein: The inner side wall of the limiting ring is used for positioning the inner shaft.

4. The CNC machine tool grinding tool according to any one of claims 1 to 3, characterized in that: The inner shaft is provided with an inner shaft hole, and the limiting member includes a limiting body located in the inner shaft hole and extending out of the limiting hole, and limiting end portions located at both ends of the limiting body.

5. The CNC machine tool grinding tool according to claim 2, wherein: A mounting hole is provided at the bottom of the disc portion, and a connector is provided at the top of the chassis. The connector can extend into the mounting hole to fixedly connect the chassis and the inner shaft.

Images