CN107052951B

CN107052951B - Grinding tool for cleaning welding pins and grinding tool system

Info

Publication number: CN107052951B
Application number: CN201710053831.9A
Authority: CN
Inventors: 孟强友; 周玉龙; 张明; 黄秋桦; 周鹏
Original assignee: Sinoev Hefei Technologies Co Ltd
Current assignee: Sinoev Hefei Technologies Co Ltd
Priority date: 2017-01-22
Filing date: 2017-01-22
Publication date: 2023-03-10
Anticipated expiration: 2037-01-22
Also published as: CN107052951A

Abstract

The invention provides a grinding tool for cleaning a welding pin and a grinding tool system, and relates to the technical field of welding. The grinding tool comprises a grinding head, a grinding sleeve and a fixing piece. The grinding head is accommodated in the grinding sleeve, and the grinding sleeve is connected with the fixing frame to clamp and fix the grinding head. The grinding tool rotates to enable the grinding head to rub the welding pin so as to grind the curling edge and residues on the welding pin. Compared with the prior art, grinding apparatus simple structure is practical, and the accessible is changed the bistrique reduces the cost of cleaing away turn-up and residue, the residue of welding needle bottom can be clear away to the bistrique, be provided with the mill hole on the bistrique, can promote the effect of cleaing away turn-up and residue on the welding needle side, and then improved cleaning efficiency.

Description

Grinding tool for cleaning welding pins and grinding tool system

Technical Field

The invention relates to the technical field of welding, in particular to a grinding tool and a grinding tool system for cleaning a welding pin.

Background

With the rapid development of the advantages of the new energy industry, the method becomes an important breakthrough for cultivating new economic growth points in countries in the world. In new forms of energy battery module trade field, the welding of battery module mainly divide into: ultrasonic welding, laser welding, resistance welding, and the like. At present, after resistance welding is carried out for a certain number of times, curled edges or residues are formed on welding pins, and the welding pins need to be polished to remove the residues and the curled edges left on the welding pins. The prior art cannot thoroughly remove the turned edge or the residues of the welding pin, and the contact resistance between the welding pin and a welded product is influenced, so that the quality of the welded product is influenced.

Therefore, a need has arisen in the art to provide a device capable of cleaning the edge curl and the residue of the welding pin and improving the cleaning efficiency.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a grinding tool and a grinding tool system for cleaning a welding pin, and aims to solve the problems that the welding pin is not thoroughly cleaned and the cleaning efficiency is low in the prior art.

The invention provides a grinding tool for cleaning welding pins, which is used for grinding and cleaning curled edges and residues on the welding pins, and the grinding tool comprises:

a grinding head for grinding the welding pin;

the grinding sleeve is matched with the grinding head;

with grind the cover and connect and block the mounting of solid bistrique, wherein:

the grinding head comprises a small end portion and a large end portion connected with the small end portion, a grinding hole matched with the welding pin is formed in the grinding head, the grinding sleeve is provided with a cavity capable of containing the grinding head and a fixing piece, a first through hole capable of exposing the small end portion is formed in the grinding sleeve, a stepped portion used for clamping and fixing the grinding head is arranged on one side, close to the first through hole, in the cavity, and the fixing piece is connected with the grinding sleeve and fixes the grinding head in the cavity through the stepped portion.

In a preferred embodiment of the present invention, at least one second through hole penetrating through the cavity is disposed on a side wall of the grinding sleeve, a third through hole penetrating through the large end portion is disposed at a bottom of the grinding hole, a blind hole communicating with the third through hole is disposed on one side of the fixing member close to the large end portion, and a fourth through hole penetrating through the blind hole is disposed on a side wall of the fixing member.

In a preferred embodiment of the present invention, a bottom wall of the fixing member is radially provided with a guide groove communicated with the fourth through hole.

In a preferred embodiment of the present invention, the grinding sleeve is provided with a first threaded portion, the fixing member is provided with a second threaded portion matching with the first threaded portion, and the grinding sleeve and the fixing member are threadedly connected to clamp and fix the grinding head in the cavity.

In a preferred embodiment of the present invention, the first thread portion is an internal thread provided in the cavity, and the second thread portion is an external thread provided on the fixing member.

In a preferred embodiment of the present invention, the side of the grinding sleeve away from the fixing member is provided with at least two mounting and dismounting holes for mounting or dismounting the grinding sleeve.

In a preferred embodiment of the present invention, the grinding hole is a conical hole, and the end of the conical hole with a larger opening is far away from the large end.

In a preferred embodiment of the present invention, the grinding head is provided with grinding lines at an end thereof away from the large end portion, and the grinding holes are provided with the grinding lines therein.

In a preferred embodiment of the present invention, the fixing member is provided with a connecting portion for connecting with the motor.

The grinding tool system comprises a grinding head motor and the grinding tool, wherein the grinding head motor is connected with the grinding tool to drive the grinding tool to rotate.

The invention provides a grinding tool for cleaning a welding pin and a grinding tool system. The grinding tool comprises a grinding head, a grinding sleeve and a fixing piece. The grinding head is accommodated in the grinding sleeve, and the grinding sleeve is connected with the fixing piece to clamp and fix the grinding head. The grinding tool rotates to enable the grinding head to rub the welding pin so as to grind the curling edge and residues on the welding pin. Compared with the prior art, grinding apparatus simple structure is practical, the residue of welding pin bottom can be clear away to the bistrique, be provided with the mill hole on the bistrique, can promote the effect of cleaing away turn-up and residue on the welding pin side, and then improved cleaning efficiency.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is to be understood that the following drawings illustrate only certain embodiments of this invention and are therefore not to be considered limiting of its scope, for those skilled in the art to which it pertains without inventive faculty, and that other related drawings may be derived therefrom.

Fig. 1 is an exploded view of a grinding tool for cleaning welding pins according to a preferred embodiment of the present invention.

Fig. 2 is another exploded view of the abrasive tool for cleaning welding pins according to the preferred embodiment of the present invention.

Fig. 3 is a schematic top view of a grinding head of the grinding tool for cleaning welding pins according to the preferred embodiment of the invention.

Fig. 4 is a sectional view taken along line I-I in fig. 3.

FIG. 5 is a schematic top view of a grinding sleeve for use in a grinding tool for cleaning a welding pin according to a preferred embodiment of the present invention.

Fig. 6 is a sectional view of the section II-II in fig. 5.

Fig. 7 is a schematic top view of a fixing member of an abrasive tool for cleaning welding pins according to a preferred embodiment of the present invention.

Fig. 8 is a sectional view taken along line III-III in fig. 7.

Fig. 9 is a schematic structural diagram of a grinding tool for cleaning welding pins according to a preferred embodiment of the present invention.

Icon: 100-grinding tool; 110-a grinding head; 111-small end; 112-big end; 113-grinding a hole; 114-a third via; 120-grinding the sleeve; 121 — a first via; 122-a cavity; 123-step portion; 124-a second via; 125-disassembly and assembly holes; 130-a fixing member; 131-blind holes; 132-a fourth via; 133-a guide groove; 134-connecting part.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "third," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should be noted that the terms "disposed," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

Fig. 1 is an exploded view of a grinding tool 100 for cleaning a welding pin according to a preferred embodiment of the present invention. The present embodiment provides a grinder 100 for cleaning a welding pin, the grinder 100 including a grinding head 110, a grinding sleeve 120, and a fixing member 130. The grinding head 110 comprises a large end part 112 and a small end part 111, the large end part 112 is fixedly connected with the small end part 111, and a grinding hole 113 matched with a welding pin is formed in the grinding head 110. The grinding sleeve 120 has a cavity 122 for accommodating the grinding head 110, and the grinding sleeve 120 is provided with a first through hole 121 for exposing the small end 111. The first through hole 121 is used to expose the grinding hole 113 in the small end portion 111, so that the welding pin to be removed can grind the edge curl and/or residues on the welding pin through the grinding hole 113.

In this embodiment, the first through hole 121 communicates with the cavity 122, the grinding head 110 is accommodated in the cavity 122 of the grinding sleeve 120, and the small end portion 111 is exposed from the first through hole 121. A step 123 is disposed in the cavity 122 on a side close to the first through hole 121, and the step 123 can cooperate with the fixing member 130 to clamp the grinding head 110, so as to prevent the grinding head 110 from being separated from the grinding sleeve 120 from the first through hole 121. Preferably, the step portion 123 is annularly disposed in the cavity 122.

In this embodiment, the grinding stones 110 may be bodies of revolution. The large end 112 has a larger diameter than the small end 111 than the large end 112 is to the small end 111. Preferably, the small end 111 is a cylinder, the large end 112 is a cylinder with a diameter larger than that of the small end 111, and the axial lines of the large end 112 and the small end 111 coincide. The thickness of the large end 112 may be smaller than the depth of the cavity 122, and the cavity 122 may reserve a space for accommodating the fixing member 130 after accommodating the large end 112.

In this embodiment, one end of the fixing member 130 may be connected to the grinding sleeve 120. One end of the fixing member 130 connected to the grinding sleeve 120 is located in the cavity 122 to clamp and fix the grinding head 110 located in the cavity 122. When the grinding tool 100 rotates, the grinding head 110 is clamped in the cavity 122, so that the grinding head 110 can be prevented from rotating relative to the grinding sleeve 120 or the fixing member 130 to influence the normal operation of the grinding tool 100.

In this embodiment, the grinding holes 113 are provided on the small end portion 111. Preferably, the axial line of the grinding hole 113 coincides with the axial line of the grinding tool 100 during rotation, so as to ensure that the grinding hole 113 can normally grind and clean the welding pin.

The grinding head 110 is worn in the process of grinding the welding pin for a long time, and when the cleaning effect on the welding pin is influenced, the grinding head 110 can be replaced. After the grinding head 110 is replaced, the grinding tool 100 can continue to work normally.

In this embodiment, the grinding head 110 may be composed of a large end 112 and a small end 111, and the grinding head 110 has a simple structure and a small volume, and the grinding head 110 requires less raw materials to manufacture, the process for manufacturing the grinding head 110 is simple, and the cost for manufacturing the grinding head 110 is low. In the process of continuously replacing the grinding head 110, the cost for cleaning the welding pins is reduced.

When the welding needle is ground, the grinding tool 100 can be driven to rotate by a motor matched with the grinding tool 100, the needle head of the welding needle is inserted into the grinding hole 113, and the rotating grinding head 110 can grind the needle head, so that the curled edge on the needle head and the residues at the bottom of the needle head are removed. The small end portion 111 can be used for polishing and cleaning welding pins except for the polishing hole 113, and the outer surface of the small end portion 111 can also be used for polishing and cleaning welding pins. The ground hole 113 can be used for cleaning the curling and/or the residue on the side edge of the welding pin, and the outer surface of the small end part 111 can be used for cleaning the curling and/or the residue on the bottom surface of the welding pin.

A portion of the removed curls and/or debris may remain in the grinding hole 113, and the curls and/or debris in the grinding hole 113 may be separated from the grinding hole 113 by centrifugal force due to the rotation of the grinder 100. When cleaning the welding pin, the grinding hole 113 may not be cleaned separately, and the grinder 100 may continuously and normally clean the curled edge and/or the residue of the welding pin.

Fig. 2 is another exploded view of the grinding tool 100 for cleaning welding pins according to the preferred embodiment of the present invention. The grinding tool 100 shown in fig. 2 is different from that shown in fig. 1 in that the grinding sleeve 120 shown in fig. 2 is provided with a second through hole 124, the grinding head 110 shown is provided with a third through hole 114 (refer to fig. 3 or fig. 4), and the fixing member 130 shown is provided with a blind hole 131 and a fourth through hole 132. The grinding hole 113, the third through hole 114, the blind hole 131, the fourth through hole 132 and the second through hole 124 form a cleaning channel for discharging the curled edges and/or the residues. The cleaning channel accelerates the removal speed of the residual curling and/or residues in the grinding hole 113, reduces the residual curling and/or residues in the grinding hole 113, and further ensures the normal operation of the grinding tool 100.

The specific working principle of the grinding tool 100 may be as follows: the grinder 100 may be connected to a motor, and the motor may be driven to rotate the grinder 100. If the welding pin is inserted into the grinding hole 113, the rotary grinding hole 113 can grind off the curled edge and/or the residues on the side edge of the welding pin; if the bottom surface of the pin is placed against the side of the grinding tip 110 remote from the large end 112, the rotating grinding tip 110 will remove the curling and/or residue from the bottom surface of the pin. During the rotation of the grinder 100, a portion of the removed curled edges and/or residues directly drops off the grinder 100, and another portion of the curled edges and/or residues is discharged from the grinder 100 through the cleaning channel.

In this embodiment, the grinding sleeve 120 may be provided with a second through hole 124. Preferably, the second through hole 124 is provided on a sidewall of the grinding sleeve 120 corresponding to the holder 130 to prevent the second through hole 124 from being blocked by the grinding head 110.

Referring to fig. 3 and 4, fig. 3 is a schematic top view of a grinding head 110 of the grinding tool 100 for cleaning welding pins according to the preferred embodiment of the present invention, and fig. 4 is a sectional view taken along line I-I of fig. 3. The bottom of the grinding bore 113 may be provided with a third through-hole 114 penetrating the grinding head 110, and the beads and/or residues may be discharged into the blind hole 131 of the fixing member 130 through the third through-hole 114.

Referring to fig. 4, in the present embodiment, the grinding hole 113 may be configured as a conical hole, and an end of the conical hole with a larger opening is far away from the large end 112. The size of the conical hole can be designed according to specific conditions, for example, the size of the conical hole is matched with the size of the needle head of the welding needle to be cleaned. Preferably, the diameter of the end of the conical hole with the larger opening is larger than that of the welding needle.

The turned edge on the welding needle is mainly positioned at the side edge of the needle head of the welding needle, and the residue is mainly positioned at the bottom surface of the needle head. When the curled edge and/or the residues of the welding pin are cleaned, the curled edge of the welding pin can be effectively removed through the conical hole, and the residues on the bottom surface of the needle head can be effectively removed through the outer surface of the small end part 111. In addition, welding pins with different diameters can be cleaned through the conical hole.

Referring to fig. 5 and fig. 6, fig. 5 is a schematic top view of a grinding sleeve 120 of the grinding tool 100 for cleaning a welding pin according to the preferred embodiment of the present invention, and fig. 6 is a sectional view of fig. 5 taken along the line II-II. In this embodiment, at least one second through hole 124 is disposed on the sidewall of the grinding sleeve 120, and the second through hole 124 is communicated with the cavity 122.

Referring to fig. 7 and 8, fig. 7 is a schematic top view of a fixing member 130 of an abrasive tool 100 for cleaning a welding pin according to a preferred embodiment of the present invention, and fig. 8 is a sectional view of III-III in fig. 7. In this embodiment, a blind hole 131 communicating with the third through hole 114 is disposed on a side of the fixing member 130 close to the large end 112, and a fourth through hole 132 communicating with the blind hole 131 is disposed on a side wall of the fixing member 130. Preferably, the second through holes 124 correspond to the fourth through holes 132 one by one. The number of the fourth through holes 132 and the number of the second through holes 124 may be designed according to specific situations, for example, the number of the fourth through holes 132 and the number of the second through holes 124 are four.

The shape and size of the second through hole 124 and the fourth through hole 132 can be designed according to specific situations. For example, the second through hole 124 may be an elongated through hole, and the fourth through hole 132 may be a circular through hole, and preferably, the diameter of the circular through hole is smaller than the width of the elongated through hole, so as to avoid the phenomenon that the cleaning channel is blocked due to the edge curl and/or residue remaining in the first through hole 121 and the second through hole 124.

In this embodiment, the bottom wall of the fixing member 130 is radially provided with a guide groove 133 communicating with the fourth through hole 132. During rotation of the grinder 100, the guide grooves 133 may guide the curling edges and/or the residues, so that the curling edges and/or the residues are discharged from the grinder 100 through the fourth through hole 132 and the second through hole 124 in sequence.

In this embodiment, the end of the grinding head 110 away from the fixing member 130 may be provided with grinding lines, and the grinding holes 113 may also be provided with grinding lines. Preferably, the grinding hole 113 is a conical hole, and grinding lines are arranged in the conical hole. The abrasive grain may be distributed over the surface of the small end 111. The grinding lines can be linear concave-convex texture structures and can also be point-shaped concave-convex texture structures.

In this embodiment, in order to connect the grinding sleeve 120, the grinding head 110 and the fixing member 130, a first threaded portion may be provided on the grinding sleeve 120, and a second threaded portion that is engaged with the first threaded portion may be provided on the fixing member 130. The grinding sleeve 120 and the fixing member 130 are threadedly coupled by first and second threaded portions and fixedly clamped to the grinding head 110 in the cavity 122.

In this embodiment, the first thread part may be an internal thread provided in the cavity 122, and the second thread part may be an external thread provided on the fixing member 130. The fixing member 130 is connected with the external thread of the grinding sleeve 120 through the internal thread, a part of the fixing member 130 is located in the cavity 122, and the fixing member 130 is engaged with the stepped portion 123 to clamp and fix the grinding head 110 in the cavity 122.

In this embodiment, the side of the grinding sleeve 120 away from the fixing member 130 is provided with at least two mounting and dismounting holes 125 for mounting or dismounting the grinding sleeve 120. Preferably, two identical mounting and dismounting holes 125 are symmetrically arranged on the grinding sleeve 120. The disassembling and assembling hole 125 is matched with a disassembling and assembling tool, a positioning column matched with the disassembling and assembling hole 125 is arranged on the disassembling and assembling tool, and the diameter of the positioning column is slightly smaller than that of the disassembling and assembling hole 125.

Specifically, when the grinding sleeve 120 is mounted or dismounted, the positioning column on the dismounting tool is inserted into the dismounting hole 125, the grinding tool 100 can be fixed on a motor or other fixing tool which does not affect dismounting, and the grinding sleeve 120 is rotated relative to the fixing member 130 by twisting the dismounting tool so as to screw or unscrew the grinding sleeve 120, so that the grinding sleeve 120 is mounted or dismounted.

In this embodiment, an end of the fixing member 130 away from the grinding sleeve 120 may be provided with a connecting portion 134 for connecting a motor. The connecting portion 134 may have a cylindrical structure, and preferably, the axis of the connecting portion 134 coincides with the axis of the fixing member 130.

Referring to fig. 2 and 9, fig. 9 is a schematic structural diagram of a grinding tool 100 for cleaning welding pins according to a preferred embodiment of the present invention. In this embodiment, the grinding head 110, the grinding sleeve 120 and the fixing member 130 in a scattered state are assembled to form the grinding tool 100. The assembled abrasive article 100 is shown in figure 9.

The step of assembling the abrasive tool 100 may be: first, the grinding head 110 is placed in the cavity 122 so that the small end portion 111 is exposed from the first through hole 121 and the large end portion 112 is received in the cavity 122; then, one end of the fixing member 130 provided with the second thread portion is screwed into the cavity 122 of the grinding sleeve 120, the grinding head 110 is clamped and fixed in the grinding sleeve 120 by the fixing member 130, and after the fixing member 130 is screwed down, the fourth through hole 132 is communicated with the second through hole 124 to form the through cleaning channel.

The invention also provides a grinding tool system for grinding and removing the curling edges and the residues on the welding pins. The grinder system includes the grinder motor and the grinder 100 of the above embodiment. The grinder 100 may be provided with a connection part 134 connected with a grinder motor, and the grinder motor and the grinder 100 are connected through the connection part 134. When the grinding head motor rotates, the grinding tool 100 is driven to rotate by transmitting torque through the connecting portion 134.

Specifically, a connection mechanism connected to the grinding tool 100 may be provided on the rotation shaft of the grinding head motor, and the connection mechanism may also be directly connected to the connection portion 134. Preferably, the axis of the grinding head 110 coincides with the axis of the grinding head motor, and the axis of the grinding hole 113 also coincides with the axis of the grinding head motor.

In summary, the present invention provides a grinding tool and a grinding tool system for cleaning a welding pin. The grinding tool comprises a grinding head, a grinding sleeve and a fixing piece. The grinding tool can be driven to rotate by the motor, when the grinding tool is used, the welding pin is inserted into the grinding hole, or the bottom surface of the welding pin is attached to one side of the grinding head far away from the large end part, and the small end part is matched with the grinding hole so as to grind and remove curled edges and residues on the side edge of the welding pin and the bottom surface of the welding pin. Compared with the prior art, grinding apparatus simple structure is practical, and the accessible is changed the bistrique reduces the cost of cleaing away turn-up and residue, the residue of welding pin bottom can be clear away to the bistrique, the mill hole that sets up on the bistrique can promote the effect of cleaing away turn-up and residue on the welding pin side, be provided with the clearance passageway on the grinding apparatus, turn-up and residue can be discharged from the grinding apparatus via this clearance passageway, and then improved cleaning efficiency.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An abrasive tool for cleaning welding pins for sanding to remove beads and residue from the welding pins, the abrasive tool comprising:

a grinding head for grinding the welding pin;

the grinding sleeve is matched with the grinding head;

the grinding head comprises a small end part and a large end part connected with the small end part, a grinding hole matched with the welding pin is formed in the grinding head, the grinding sleeve is provided with a cavity capable of accommodating the grinding head and a fixing part, a first through hole capable of exposing the small end part is formed in the grinding sleeve, a stepped part used for clamping and fixing the grinding head is arranged on one side, close to the first through hole, in the cavity, and the fixing part is connected with the grinding sleeve and fixes the grinding head in the cavity through the stepped part;

the side wall of the grinding sleeve is provided with at least one second through hole communicated with the cavity, the bottom of the grinding hole is provided with a third through hole communicated with the large end part, one side of the fixing piece close to the large end part is provided with a blind hole communicated with the third through hole, and the side wall of the fixing piece is provided with a fourth through hole communicated with the blind hole; the second through holes are communicated with the fourth through holes in a one-to-one correspondence manner;

a guide groove communicated with the fourth through hole is radially arranged on the bottom wall of the fixing piece;

the grinding hole is a conical hole, and the larger end of the conical hole is far away from the large end part;

one end of the grinding head, which is far away from the large end part, is provided with grinding grains, and the grinding hole is internally provided with the grinding grains;

the fixing piece is provided with a connecting part connected with the motor.

2. The grinding tool of claim 1 wherein said grinding sleeve has a first threaded portion thereon and said mounting has a second threaded portion thereon for mating with said first threaded portion, said grinding sleeve and said mounting being threadably engaged to capture said grinding head within said cavity.

3. The grinding tool of claim 2 wherein said first threaded portion is an internal thread disposed in said cavity and said second threaded portion is an external thread disposed on said fixed member.

4. The grinding tool of claim 2 wherein the side of the grinding sleeve remote from the fixed member is provided with at least two mounting and dismounting holes for mounting or dismounting the grinding sleeve.

5. An abrasive tool system for removing curl and residue from a welding pin, the abrasive tool system comprising a grinder motor and the abrasive tool of any one of claims 1-4, wherein the grinder motor is coupled to the abrasive tool to rotate the abrasive tool.