CN115781506A

CN115781506A - Special grinding tool for CNC (computer numerical control) machine tool

Info

Publication number: CN115781506A
Application number: CN202211163370.8A
Authority: CN
Inventors: 张莹; 梁绍钜; 肖先智; 王继成; 黄子强; 张思东
Original assignee: Zhuhai Runxingtai Electrical Equipment Co Ltd
Current assignee: Zhuhai Runxingtai Electrical Equipment Co Ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2023-03-14

Abstract

The embodiment of the invention discloses a special grinding tool for a CNC (computer numerical control) machine tool, which comprises a sleeve, a spring, an inner shaft, a chassis and a grinding part, wherein the sleeve is used for being connected with the CNC machine tool; the sleeve is internally provided with a containing cavity and is provided with a limiting hole arranged in the radial direction; the inner shaft extends into the cavity, a limiting piece is fixedly arranged on the inner shaft, and the limiting piece is positioned 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 used for generating acting force on the inner shaft in a direction away from the container; the bottom of the chassis is provided with a grinding piece, and the grinding piece is used for grinding a workpiece. The grinding device can be quickly assembled with a CNC machine tool, utilizes the CNC machine tool to grind workpieces, expands the functions of the CNC machine tool, and has the advantages of exquisite and compact structure and convenient assembly.

Description

Special grinding tool for CNC (computer numerical control) machine tool

Technical Field

The invention relates to a machining device, in particular to a special grinding tool for a CNC (computer numerical control) machine tool.

Background

In the field of machining, defects on the surface of a workpiece, such as pits, spots, mantle, lines, bruises and scratches, etc., often require polishing. Because the workpieces with surface defects are different in shape and size and large in quantity fluctuation, the conventional method adopts a handheld pneumatic grinding machine for grinding.

The existing handheld pneumatic grinding machine mainly comprises a rotating motor, a rotating shaft and a grinding head, wherein the rotating motor, the rotating shaft and the grinding head are all in rigid connection, and grinding pressure, buffering and feeding are all provided by arms of people. Pneumatic grinding machine among the prior art needs manual many times to grind could reach the requirement, and is inefficient slowly, and different personnel's operating force is inconsistent moreover, causes easily to grind light or grind excessively, too relies on feeling and experience, is difficult to guarantee to grind quality stability.

A CNC machine is a machine for performing precision machining by driving a rotary spindle connected to a tool by a driving mechanism having three or more axes. In order to realize the precise processing of the workpiece, the driving structure drives the rotating main shaft to process according to a preset processing program through the rigid connection of the stepping motor and the transmission gear. However, for the grinding work of the workpiece surface, a certain range of flexible space is needed to avoid the influence of local grinding pressure change caused by the unevenness of the workpiece surface on the grinding quality. Therefore, it is difficult for the CNC machine to perform a grinding work in cooperation with the existing grinding machine or grinding head.

Disclosure of Invention

The grinding tool special for the CNC machine tool is provided for solving the defects of the prior art, can be quickly assembled with the CNC machine tool, utilizes the CNC machine tool to grind workpieces, expands the functions of the CNC machine tool, and is exquisite and compact in structure and convenient to assemble.

In order to solve the technical problem, the embodiment of the invention provides a grinding tool special for a CNC (computer numerical control) machine tool, which comprises a sleeve, a spring, an inner shaft, a chassis and a grinding piece, wherein the sleeve is used for being connected with the CNC machine tool; a containing cavity is arranged in the sleeve, and the sleeve is provided with a limiting hole which is arranged in the radial direction; the inner shaft extends into the cavity, a limiting piece is fixedly arranged on the inner shaft, and the limiting piece is positioned 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 used for generating acting force on the inner shaft in the direction away from the container; the bottom of the chassis is provided with a grinding piece, and the grinding piece is used for grinding a workpiece.

In an improvement of the above scheme, a disc part is arranged at the bottom end of the inner shaft, and the diameter of the disc part is larger than that of the inner shaft.

As an improvement of the scheme, a limiting ring is arranged in the accommodating cavity, and the inner side wall of the limiting ring is used for positioning the inner shaft.

As an improvement of the scheme, the chassis comprises a force transmission layer, a buffer layer and a force application layer which are sequentially arranged, the force transmission layer is a rigid layer, the buffer layer has elasticity, and the force application layer is used for being connected with the grinding piece.

As an improvement of the above solution, a surface of the force application layer connected to the polishing member has a concave-convex structure.

As an improvement of the above scheme, one end of the spring abuts against the bottom of the limiting ring, and the other end of the spring abuts against the upper surface of the disc part.

As an improvement of the above scheme, the inner shaft is provided with an inner shaft hole, and the limiting member includes a limiting main body located in the inner shaft hole and extending out of the limiting hole, and limiting end portions located at two ends of the limiting main body.

As a modification of the above, the abrasive member is sandpaper.

As an improvement of the scheme, the bottom of the disc part is provided with a mounting hole, the top of the chassis is provided with a connector, and the connector can extend into the mounting hole to fixedly connect the chassis with the inner shaft.

The embodiment of the invention has the following beneficial effects:

1. by adopting the grinding tool, the grinding tool can be rapidly assembled with a CNC (computer numerical control) machine tool, the CNC machine tool is utilized for grinding workpieces, the functions of the CNC machine tool are expanded, the structure is exquisite and compact, and the grinding tool is convenient to assemble.

2. The grinding tool is provided with a buffer structure mainly formed by a spring sleeved on an inner shaft, and can provide constant grinding pressure for a workpiece and adapt to the working environment of a CNC (computer numerical control) machine tool.

3. The chassis is including the biography power layer, buffer layer and the application of force layer that set gradually, the biography power layer is the rigidity layer, the buffer layer has elasticity, the application of force layer be used for with it connects to grind the piece. The force transmission layer is a rigid layer, is made of hard materials and is used for diffusing the pressure of the disc part and uniformly transmitting the pressure downwards; the buffer layer can be made of elastic materials such as sponge and the like and is used for providing possibility of inclination and deformation for the grinding piece when the surface of the workpiece is not flat; the force application layer can be made of silica gel and is used for covering the lower surface of the buffer layer to form a surface with high tensile strength, so that the grinding piece is prevented from being pulled to be cracked when the bulge of the workpiece is ground, and the service life of the grinding piece is prolonged.

4. The surface of the force application layer connected with the grinding piece is provided with a wavy concave-convex structure, the wavy concave-convex structure can uniformly support the grinding piece in a point mode, and compared with a planar support, the supporting point of the point support can be compressed when being subjected to grinding pressure during grinding to form an elastic compensation structure.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a CNC machine special grinding tool of the present invention;

FIG. 2 is a cross-sectional view of one embodiment of a CNC machine specialized milling tool of the present invention;

FIG. 3 is a cross-sectional view of another embodiment of a CNC machine specialized milling tool of the present invention;

fig. 4 is a schematic structural diagram of a force application layer of an embodiment of a grinding tool dedicated to a CNC machine according to the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It is only noted that the invention is intended to be limited to the specific forms set forth herein, including any reference to the drawings, as well as any other specific forms of embodiments of the invention.

As shown in fig. 1 and 2, the specific embodiment of the invention provides a grinding tool special for a CNC machine tool, which comprises a sleeve 1, a spring 2, an inner shaft 3, a chassis 4 and a grinding piece 5, wherein the sleeve 1 is used for being connected with the CNC machine tool; a containing cavity 11 is arranged in the sleeve 1, and the sleeve 1 is provided with a limiting hole 12 which is radially arranged; the inner shaft 3 extends into the cavity 11, a limiting piece 6 is fixedly arranged on the inner shaft 3, and the limiting piece 6 is located in the limiting hole 12; the chassis 4 is arranged at the bottom of the inner shaft 3, and the spring 2 is sleeved on the surface of the inner shaft 3 and used for generating acting force on the inner shaft 3 in a direction away from the container; the bottom of the chassis 4 is provided with a grinding part 5, and the grinding part 5 is used for grinding a workpiece. As shown in fig. 2, the end of the sleeve 1 connected to the CNC machine may be sealed, and the sealing design may increase the strength of the sleeve 1 and reduce the elastic deformation of the sleeve 1. As shown in fig. 3, one end of the sleeve 1 connected to the CNC machine tool may also be hollow, and the hollow design may reduce the weight of the sleeve 1, and may also meet the requirement that a part of the spindle of the CNC machine tool extends into the hollow portion of the sleeve 1 for connection.

Adopt above-mentioned grinding tool, can be fast with CNC lathe assembly, utilize the CNC lathe to carry out the work piece and grind, expanded the function of CNC lathe, the structure is exquisite compact, the equipment of being convenient for.

Preferably, the bottom end of the inner shaft 3 is provided with a disc part 31, and the diameter of the disc part 31 is larger than that of the inner shaft 3. A limiting ring 13 is arranged in the accommodating cavity 11, and the inner side wall of the limiting ring 13 is used for positioning the inner shaft 3. Through setting up spacing ring 13, can prevent that interior axle 3 from taking place to heel at flexible in-process, influencing the axiality of interior axle 3 and sleeve 1, influence the homogeneity of polishing.

The grinding is carried out by a CNC machine tool, the grinding feeding of the CNC machine tool can be accurately controlled by the machine tool, but the state of the grinding member 5 can be changed along with the surface of a ground workpiece in the grinding process, in order to provide uniform and constant supporting force for the grinding member 5 in the grinding process, the chassis 4 comprises a force transmission layer 41, a buffer layer 42 and a force application layer 43 which are sequentially arranged, the force transmission layer 41 is a rigid layer, the buffer layer 42 has elasticity, and the force application layer 43 is used for being connected with the grinding member 5. The force transmission layer 41 is a rigid layer, is made of a hard material, and is used for diffusing the pressure of the disc part 31 and uniformly transmitting the pressure downwards; the cushion layer 42 may be made of a material having elasticity such as sponge, and is used to provide the possibility of inclination and deformation to the abrasive article 5 when the surface of the workpiece is not flat; the force application layer 43 may be made of silicone rubber, and is used to cover the lower surface of the buffer layer 42 to form a surface with high tensile strength, so as to prevent the abrasive member 5 from being torn when the protruding portion of the workpiece is abraded, and prolong the service life of the abrasive member 5. The abrasive article 5 may be sandpaper.

As shown in fig. 4, preferably, the surface of the force application layer 43 connected to the polishing member 5 has a concave-convex structure. Preferably, the surface of the force application layer 43 connected with the grinding member 5 is provided with a wavy concave-convex structure 431, the wavy concave-convex structure 431 can uniformly and point-type support the grinding member 5, and compared with a planar support, the supporting point of the point-type support is compressed when being subjected to grinding pressure during grinding, so as to form an elastic compensation structure, when the grinding material part on the surface of the grinding member 5 is absent after grinding for a period of time, the supporting point can independently extend out, the absence of the grinding material is compensated, and the uniformity and the reliability of CNC grinding are further ensured.

Because the CNC machine tool does not have a buffer mechanism, the design adds a buffer structure, which is mainly composed of a spring 2 sleeved on the inner shaft 3, one end of the spring 2 is abutted against the bottom of the limit ring 13, and the other end is abutted against the upper surface of the disc part 31. When the sleeve 1 fixedly connected with a rotating shaft of a machine tool drives the inner shaft 3 to descend and the grinding piece 5 abuts against a ground workpiece, the descending stroke of the inner shaft 3 is blocked, the sleeve 1 continues to descend relative to the inner shaft 3, and the pressure applied to the ground workpiece by the inner shaft 3 is provided by the spring 2.

Preferably, the inner shaft 3 is provided with an inner shaft hole 32, and the limiting member 6 comprises a limiting main body 61 located in the inner shaft hole 32 and extending out of the limiting hole 12, and limiting end portions 62 located at two ends of the limiting main body 61.

In order to facilitate the quick replacement of the chassis 4, a mounting hole 311 is formed in the bottom of the disc portion 31, a connector 44 is formed in the top of the chassis 4, and the connector 44 can extend into the mounting hole 311 to fixedly connect the chassis 4 and the inner shaft 3. Preferably, the mounting hole 311 is a threaded hole, the connecting head 44 is a stud, and the stud is screwed into the threaded hole to fixedly connect the disc portion 31 with the chassis 4.

The working principle of the grinding cutter is as follows:

1. the sleeve 1 of the grinding tool is fixed on a rotating shaft of a CNC (computer numerical control) machine tool, the rotating shaft is controlled to move to the position above a workpiece to be ground, and the rotating shaft descends until a grinding part 5 is in contact with the surface of the workpiece.

2. The rotating shaft is further lowered, so that relative displacement is generated between the sleeve 1 and the inner shaft 3, the limiting element is lifted in the limiting hole 12 along with the inner shaft 3, and the spring 2 is compressed to form grinding pressure.

3. The pivot is rotatory, drives the axle sleeve rotatory, and interior axle 3 is in the synchronous revolution of axle sleeve under the drive of locating part 6, grinds workpiece surface with grinding 5. In the grinding process, the spring 2 is used for providing overall pressure preset by the process, the pressure is transmitted to the buffer layer 42 through the force transmission layer 41, and when the surface of a workpiece is an uneven surface, the buffer layer 42 provides a local deformation space for the grinding piece 5, so that the uneven part of the surface of the workpiece can be ground; meanwhile, the force transmission layer 41 is used for protecting the lower surface of the buffer layer 42 and serves as a reinforcing structure of the grinding piece 5, a reinforcing function of a base material can be provided when the grinding piece 5 rotates and moves on the three-dimensional surface of a workpiece, the grinding piece 5 can be reasonably deformed to be attached to the surface of the workpiece, the grinding piece 5 can be prevented from being torn when passing through a concave-convex surface in the high-speed rotating process, and the structure is matched with each other to finish automatic grinding work of a planar or non-planar CNC machine tool.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

1. The special grinding tool for the CNC machine tool is characterized by comprising a sleeve, a spring, an inner shaft, a chassis and a grinding piece, wherein the sleeve is used for being connected with the CNC machine tool;

a containing cavity is arranged in the sleeve, and the sleeve is provided with a limiting hole which is arranged in the radial direction;

the inner shaft extends into the cavity, a limiting piece is fixedly arranged on the inner shaft, and the limiting piece is positioned 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 used for generating acting force on the inner shaft in the direction away from the container;

the bottom of the chassis is provided with a grinding piece, and the grinding piece is used for grinding a workpiece.

2. The CNC-machine-dedicated grinding tool according to claim 1, wherein the bottom end of the inner shaft is provided with a disc portion having a diameter larger than that of the inner shaft.

3. The CNC machine special grinding cutter according to the claim 2, characterized in that, a spacing ring is provided in the chamber, the inner side wall of the spacing ring is used for positioning the inner shaft.

4. The CNC machine tool special grinding tool of claim 1, wherein the chassis comprises 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 has elasticity, and the force application layer is used for being connected with the grinding piece.

5. The CNC machine specific abrasive tool according to claim 4, wherein a face of the force application layer to which the abrasive member is attached has a concavo-convex structure.

6. A CNC machine special grinding tool according to claim 3, wherein the spring has one end abutting on the bottom of the position limiting ring and the other end abutting on the upper surface of the disk portion.

7. The grinding tool special for CNC machine tools of any one of claims 1-6, wherein the inner shaft is provided with an inner shaft hole, the limiting member comprises 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.

8. The CNC machine specific grinding tool of any one of claims 1-6 wherein the grinding member is sandpaper.

9. The grinding tool special for CNC machine tool as claimed in claim 2, wherein the bottom of the disk part is provided with a mounting hole, the top of the base plate is provided with a connector, the connector can extend into the mounting hole to fixedly connect the base plate with the inner shaft.