Grinding tool

Abstract

The invention relates to a grinding tool (1) comprising an elongate tool body (2) comprising a first end (20) comprising a grinding head (3) with an abrasive coating (4) and a second end (21), an axial channel (5) extending from the second end (21) through the tool body (2) over a given length of the body, and at least one fluid transfer channel (6) extending through the tool body (2). The invention relates to a grinding head (3) comprising a fluid transfer channel (4) arranged in cooperation with an axial channel (5) in order to allow a fluid introduced into the axial channel (5) at a second end (21) to be ejected through the grinding head (3), the grinding head (3) having an outer end face (30) delimited by an outer circumferential surface (31), the outer end face having at least one groove (6a to 6f) extending radially from the axial channel (5) to the outer circumferential surface (31), said groove being closed along its length by an abrasive coating (4), to form the at least one fluid transfer channel. The invention also relates to a method for manufacturing the electroplated grinding tool.

Description

(19) State Intellectual Property Office (12) Invention Patent Application (10) Application Publication Number (43) Application Publication Date (21) Application Number 202511874167.5 (22) Application Date 2025.12.12 (30) Priority Data 24222394.9 2024.12.20 EP (71) Applicant Comaudou S.A. Address Switzerland (72) Inventor P. Faustino P. Willy (74) Patent Agency Beijing Zhongzi Law Firm 11247 Patent Attorney Gao Meiyan Wan Liujun (51) Int.Cl. B24B 41 / 04 (2006.01) B24D 18 / 00 (2006.01) (54) Title of Invention: Grinding Tool (57) Abstract: This invention relates to a grinding tool (1) comprising an elongated tool body (2), an axial channel (5), and at least one fluid delivery channel. The tool body includes a first end (20) and a second end (21). The first end includes a grinding head (3) with an abrasive coating (4). The axial channel extends from the second end (21) through the tool body (2) over a given length of the body. The fluid delivery channel is arranged to mate with the axial channel (5) to allow fluid introduced into the axial channel (5) at the second end (21) to be ejected through the grinding head (3). The grinding head (3) has an outer end face (30) defined by an outer peripheral surface (31). The outer end face has at least one groove (6a to 6f) extending radially from the axial channel (5) to the outer peripheral surface (31). The groove is closed along its length by the abrasive coating (4) to form the at least one fluid delivery channel. The invention also relates to a method of manufacturing an electroplated grinding tool. Claims (1 page), Description (4 pages), Drawings (2 pages), CN 122253083 A, 2026.06.23, CN 1 22 25 30 83 A 1. A grinding tool (1) comprising an elongated tool body (2) including a first end (20) referred to as a grinding end and a second end (21) opposite to the first end (20), the first end (20) including a grinding head (3) having a circular cross-section, the outer surface of the grinding head (3) being covered with an abrasive coating (4), characterized in that the grinding tool includes a channel structure including an axial channel (5) and at least one fluid delivery channel (6), the axial channel (5) extending from the second end (21) through the tool body (2) over a given length of the tool body, the fluid delivery channel (6) being arranged to mate with the axial channel (5) to allow cooling and / or lubricating fluid introduced at the second end (21) into the axial channel (5) to be ejected through the grinding head (3), the grinding head (3) having a peripheral surface(31) A defined outer end face (30) having at least one groove (6a to 6f) extending radially from the axial channel (5) to the outer peripheral surface (31), the at least one groove being closed along its length by the abrasive coating (4) to form the at least one fluid delivery channel (6). 2. The grinding tool (1) according to claim 1, characterized in that the grinding head (3) comprises a plurality of radially distributed grooves (6a to 6f) uniformly distributed on the outer end face (30). 3. The grinding tool (1) according to claim 1 or 2, characterized in that the grinding head (3) comprises a central hole (32) communicating with the axial channel (5), the central hole (32) being closed by an element (7) forming a plug. 4. The grinding tool (1) according to any of the preceding claims, characterized in that the abrasive coating (4) comprises diamond particles. 5. The grinding tool (1) according to any of the preceding claims, characterized in that the grinding head (3) is in the form of a disc-shaped plate. 6. The grinding tool (1) according to any one of the preceding claims, characterized in that the tool body (2) and the grinding head (3) are integrally formed. 7. The grinding tool (1) according to any one of the preceding claims, characterized in that the grinding tool is T-shaped. 8. The grinding tool (1) according to any one of the preceding claims, characterized in that the grinding tool (1) is an electroplated tool. 9. A method for manufacturing a grinding tool (1) according to claim 8, characterized in that the method comprises the following steps: - machining a metal blank to form a tool body (2) and a grinding head (3) of desired shape and size; - machining at least one radial groove (6a to 6f) on the outer end face (30) of the grinding head (3) by wire electrical discharge machining, the groove extending from the axial channel (5) formed during machining of the metal blank to the outer peripheral surface (31) of the grinding head (3); - forming an abrasive coating (4) on the grinding head (3) by immersion in an electroplating bath; - sealing the at least one groove (6a to 6f) by covering the outer end face (30) with the abrasive coating formed during the electroplating bath immersion operation, thereby forming the at least one fluid delivery channel (6). Claims 1 / 1 page 2 CN 122253083 A Grinding Tool Technical Field

[0001] The present invention relates to a grinding tool, and more specifically to a grinding tool comprising an elongated tool body, the tool body comprising a first end referred to as a grinding end and a second end opposite to the first end, the first end comprising a grinding head having a circular cross-section, the outer surface of the grinding head being covered with an abrasive coating.

[0002] The grinding tools according to the invention are specifically designed for, but not limited to, creating grooves, recesses, or slots on workpieces, for precision grinding, and for grinding hard materials such as ceramics, hardened steel, or hardened areas. Background Art

[0003] Grinding tools for creating grooves, recesses, or slots on workpieces made of hard materials, for precision grinding, and for grinding particularly hard materials or hardened areas are typically T-shaped diamond-coated grinding tools.

[0004] Diamond-coated grinding tools include an abrasive section, which is typically manufactured by mixing diamond particles with a binder, and then bonding this mixture of diamond particles and binder to the relevant surface of the grinding tool by adhesive bonding, brazing, or soldering to form a diamond-coated ring. A problem with grinding tools manufactured in this way is that if the grinding tool overheats during use, there is a risk that the diamond-coated ring may separate from the tool body. In fact, diamond-coated grinding tools are sometimes used in hardened areas, thus making it impossible to ensure adequate lubrication of the grinding tool and the area being ground.

[0005] Another commonly used diamond-coated grinding tool manufacturing technology is abrasive electrolytic deposition. This technology involves depositing diamond particles onto the tool surface and immersing the tool in an electrolytic cell (typically a nickel electrolytic cell). Upon energization, nickel is deposited around the diamond particles and on the tool surface, thereby fixing the diamond particles encapsulated in the mold to the tool surface. While this method improves the bonding between the diamond particles and the tool and minimizes the diamond ring separation problem that occurs in the aforementioned diamond-coated grinding tools, it does not help solve the problem of overheating during use, which affects the tool's lifespan and the surface condition of the workpiece.

[0006] The present invention aims to solve the aforementioned problems related to grinding tools by providing a grinding tool that prevents or at least limits the risk of overheating during use, regardless of the accessibility of the grinding tool's operating area, while simultaneously extending the grinding tool's lifespan.

[0007] A further object of the present invention is to provide a grinding tool capable of precise, high-quality grinding while preserving the surface condition of both the workpiece and the grinding tool itself.

[0008] Accordingly, according to a first aspect, the present invention relates to a grinding tool comprising an elongated tool body including a first end referred to as a grinding end and a second end opposite to the first end, the first end including, for example, a grinding head having a circular cross-section, the outer surface of which is covered with an abrasive coating.

[0009] A significant feature of the grinding tool is that it includes a channel structure comprising an axial channel and at least one fluid delivery channel, the axial channel extending from the second end through the tool body in the feed direction of the tool body.Extending a certain length, the fluid delivery channel is arranged to mate with the axial channel to allow cooling and / or lubricating fluid introduced into the axial channel at the second end to be ejected through the grinding head. The grinding head has an outer end face defined by an outer peripheral surface (page 1 / 4 of specification 3 CN 122253083 A), the outer end face having at least one groove extending radially from the axial channel to the outer peripheral surface, the at least one groove being closed along its length by the abrasive coating to form the at least one fluid delivery channel.

[0010] This channel structure ensures lubrication of the interface between the grinding tool and the workpiece, thereby reducing the risk of overheating of the grinding head. This not only extends the service life of the grinding tool but also improves grinding conditions by limiting the risk of deterioration of the surface condition of the workpiece. The radial channel formed near the outer end face allows grinding heads of any size to be equipped with fluid delivery channels, especially grinding heads in the form of disc-shaped plates. Furthermore, the radial direction of the fluid delivery channel allows for targeted spraying of the grinding head, thereby better control of the grinding operation.

[0011] Another advantage of this channel structure is that it enables a robust and rigid tool design, thus providing significant resistance to mechanical stress.

[0012] Advantageously, the grinding head includes a plurality of radially distributed grooves evenly distributed on the outer end face. This groove arrangement provides a fluid delivery channel that ensures uniform spraying at the outlet on the outer circumferential surface of the grinding head.

[0013] Advantageously, the grinding head includes a central hole communicating with the axial channel, the central hole being closed by an element forming a plug.

[0014] Advantageously, the abrasive coating comprises diamond particles.

[0015] Advantageously, the grinding head is in the form of a disc-shaped plate.

[0016] Advantageously, the tool body is integrally formed with the grinding head.

[0017] Advantageously, the grinding tool is T-shaped. This profile allows for precise grinding operations. Furthermore, this profile allows for machining in areas where workpiece contact is limited. Because the fluid delivery channel is arranged at the outer end face of the grinding head, grinding control is improved, and the grinding tool is less prone to overheating.

[0018] Advantageously, the grinding tool is an electroplated tool. The manufacture of the grinding tool, more specifically, by applying an abrasive coating to the grinding head through electroplating, enables the rapid production of sharp and very durable grinding tools.

[0019] The invention also relates to a method of manufacturing the above-described grinding tool, the method comprising the steps of:

[0020] - machining a metal blank to form a tool body and a grinding head of desired shape and size,

[0021] - machining at least one radial groove on the outer end face of the grinding head by wire electrical discharge machining, the groove extending from the axial channel formed during machining of the metal blank to the outer peripheral surface of the grinding head,

[0022] -By immersing in an electroplating bath, an abrasive coating is formed on the grinding head.

[0023] - The at least one groove is sealed by covering the outer end face with the abrasive coating formed during the electroplating bath immersion operation, thereby forming the at least one fluid delivery channel. Brief Description of the Drawings

[0024] Other features and advantages of the invention can be clearly seen from the detailed description of the invention provided by way of example with reference to the accompanying drawings, in which:

[0025] FIG1 shows a perspective view of a grinding tool according to an exemplary embodiment of the invention.

[0026] FIG2 shows a perspective view of the grinding tool in FIG1 before the electroplating operation.

[0027] FIG3 shows a cross-sectional view of the electroplated grinding tool along axis III-III.

[0028] FIG4 shows a schematic partial side view of the grinding head on the grinding tool in FIG3. Specification 2 / 4 pages 4 CN 122253083 A Detailed Description

[0029] FIG1 shows a perspective view of a grinding tool 1 according to an exemplary embodiment of the invention.

[0030] In the exemplary embodiment shown, the grinding tool 1 has an overall "T" shape. The grinding tool 1 includes an elongated, generally cylindrical tool body 2. The tool body 2 includes a first end 20, referred to as the grinding end, and a second end 21 opposite to the first end 20. The first end 20 includes a grinding head 3 having a circular cross-section, the outer surface of which is covered with an abrasive coating 4. More specifically, the grinding head 3 has an outer end face 30, which is preferably flat and surrounded by an outer peripheral face 31, both of which are coated with abrasive particles. The abrasive coating 4 advantageously contains diamond abrasive particles. According to a variant embodiment, it is contemplated that the abrasive coating contains cubic boron nitride particles or a mixture of diamond particles and cubic boron nitride particles. Needless to say, the hardness of the abrasive particles is higher than the hardness of the workpiece being processed.

[0031] In the illustrated example, the grinding head 3 is in the form of a disc-shaped plate. The illustrated grinding head 3 can be used to process materials, especially to form grooves, notches, recesses, or slots on workpieces. Of course, this is only one example embodiment; the grinding head 3 can have different sizes and shapes to suit the intended use of the grinding tool. Preferably, the grinding head 3 is integrally formed with the tool body 2. Thus, the grinding head 3 and the tool body 2 constitute a single component.

[0032] The grinding tool 1 includes a channel structure that allows cooling and / or lubricating fluid to be sprayed at the outlet of the grinding head 3. The primary purpose of fluid spraying is to limit the risk of overheating of the grinding head 3 during workpiece grinding. This channel structure can also be used as an auxiliary method for removing chips or other materials during workpiece grinding.

[0033] More specifically, the channel structure includes an axial channel 5 that extends from the second end 21 through the tool body 2 for a given length of the tool body.

[0034] In the example described, the axial channel 5 extends axially from the second end 21 through the tool body 2 to the first end 20, and the axial channel 5 opens at both ends of the tool body 2, as shown in Figures 2 and 3. The axial channel opening formed at the second end 21 of the tool body 2 constitutes an inlet 51 through which cooling and / or lubricating fluid is injected.

[0035] The channel structure also includes a plurality of fluid delivery channels 6 arranged at the grinding head 3. These fluid delivery channels 6 are arranged to cooperate with the axial channel 5 so as to allow fluid introduced into the axial channel 5 to be sprayed onto the outer peripheral surface 31.

[0036] According to the invention, the fluid delivery channel 6 includes grooves 6a to 6f formed on the outer end face 30 of the grinding head 3, the respective longitudinal openings of these grooves on the outer end face 30 being closed by an abrasive coating 4.

[0037] More specifically, each groove 6a to 6f extends radially from the axial channel 5 so as to open on the outer peripheral surface 31 of the grinding head 3. In the illustrated example, the six grooves 6a to 6f are advantageously evenly distributed on the outer end face 30. Of course, this is an example configuration, as the outer end face 30 can be provided with a different number of uniformly or non-uniformly distributed grooves. The grooves 6a to 6f are closed along their entire length by an abrasive coating 4 covering the outer end face 30. When closed in this way, the grooves 6a to 6f, together with the portion of the abrasive coating that closes the longitudinal opening of the corresponding groove at the height of the outer end face, form radial channels leading to the outer peripheral surface, which form fluid delivery channels 6.

[0038] As shown in FIG2, the grinding head 3 includes a central hole 32 communicating with the axial channel 5. In the illustrated example, the central hole 32 is closed by an element 7 forming a plug.

[0039] In the illustrated example, the grinding tool 1 is T-shaped. Of course, this is only an exemplary embodiment; any other shape may be used without departing from the scope of the invention.

[0040] The manufacturing process of the grinding tool 1 is as follows. First, the grinding head 3 and the tool body 2 are manufactured by machining a blank, preferably made of metal. This can be a workpiece made of heavy metal, hard metal, or high-speed steel. The machining operation is performed according to the required opening shape and size of the grinding tool 1. In this example, in the described example, the workpiece is T-shaped, with one part forming the generally cylindrical tool body 2 and the other part forming the grinding head 3. Furthermore, a coaxial channel is manufactured through the workpiece on pages 3 / 4 of the specification (CN 122253083 A). This channel forms the axial channel 5 of the grinding tool 1.

[0041] Then, the outer end face 30 of the grinding head 3 is machined to form radial grooves 6a to 6f. The grooves 6a to 6f extend from the axial channel 5 formed during the machining of the blank to the outer peripheral surface 31 of the grinding head 3. The grooves 6a to 6f are formed by wire electrical discharge machining. Alternatively, the grooves 6a to 6f can also be formed by any suitable method, such as by laser machining.

[0042] Then, the abrasive particles are bonded to the grinding head 3 by immersion in the electroplating tank. During this immersion process, the abrasive particles bond to the grinding head 3, at least covering the outer end face 30 and the outer peripheral face 31, while sealing the “surface” grooves 6a to 6f. “Surface” refers to the area where the material does not enter the grooves 6a to 6f themselves to fill them. Figure 4 shows the “surface” sealing of the groove (groove 6d) by the abrasive coating 4. As shown, the groove is sealed by the deposit of abrasive particles, and the diffusion of abrasive particles is limited to the channel due to the narrow opening created when the wire passes through to form the groove. In other words, a bushing composed of particles is formed where the wire passes through during the electroplating growth process. The present invention advantageously utilizes the tip effect phenomenon, which allows abrasive particles to accumulate at the acute angle of the grinding head 3 or at angles with a small radius of curvature.

[0043] The grinding tool 1 is then removed from the electroplating tank. After rinsing and cooling, if necessary, the outer peripheral surface 31 of the grinding head 3 is machined to remove any abrasive particle deposits that may clog the grooves 6a to 6f formed during the electroplating process.

[0044] Temporary covers or bushings may also be installed at the end openings of each groove 6a to 6f to prevent the ends from being clogged by abrasive particles. These bushings can be removed after the grinding tool 1 is removed from the electroplating tank.

[0045] The above description of the invention is provided by way of example only. Those skilled in the art will understand that various modifications can be made to the invention without departing from its scope.

[0046] Terminology

[0047] 1 Grinding tool

[0048] 2 Tool body

[0049] 3 Grinding head

[0050] 4 Abrasive coating

[0051] 5 Axial channel

[0052] 6 Fluid delivery channel

[0053] 7 Element forming plug

[0054] 6a to 6f Groove

[0055] 20 First end

[0056] 21 Second end

[0057] 30 Outer end face

[0058] 31 Outer peripheral surface

[0059] 32 Center hole

[0060] 51 Inlet. Instruction manual 4 / 4 pages 6 CN 122253083 A Figure 1 Figure 2 Instruction manual drawings 1 / 2 pages 7 CN 122253083 A Figure 3 Figure 4 Instruction manual drawings 2 / 2 pages 8 CN 122253083 A Abstract The present invention relates to a grinding tool (1) comprising an elongated tool body (2), an axial channel (5), and at least one fluid delivery channel, the toolbody comprising a first end (20) and a second end (21), the first end comprising a grinding head (3) with an abrasive coating (4), the axial channel extending from the second end (21) through the tool body (2) over a given length of the body, the fluid delivery channel being arranged in conjunction with the axial channel (5) to allow fluid introduced into the axial channel (5) at the second end (21) to be ejected through the grinding head (3), the grinding head (3) having an outer end face (30) defined by an outer peripheral surface (31), the outer end face having at least one groove (6a to 6f) extending radially from the axial channel (5) to the outer peripheral surface (31), the groove being closed along its length by the abrasive coating (4) to form the at least one fluid delivery channel. The present invention also relates to a method for manufacturing electroplated grinding tools.

Claims

1. A grinding tool (1) comprising an elongated tool body (2) including a first end (20) referred to as a grinding end and a second end (21) opposite to the first end (20), the first end (20) including a grinding head (3) having a circular cross-section, the outer surface of the grinding head (3) being covered with an abrasive coating (4), characterized in that, The grinding tool includes a channel structure comprising an axial channel (5) and at least one fluid delivery channel (6), the axial channel (5) extending from the second end (21) through the tool body (2) over a given length of the tool body, the fluid delivery channel (6) being arranged to cooperate with the axial channel (5) to allow cooling and / or lubricating fluid introduced at the second end (21) into the axial channel (5) to be ejected through the grinding head (3), the grinding head (3) having an outer end face (30) defined by an outer peripheral surface (31), the outer end face (30) having at least one groove (6a to 6f) extending radially from the axial channel (5) to the outer peripheral surface (31), the at least one groove being closed along its length by the abrasive coating (4) to form the at least one fluid delivery channel (6).

2. The grinding tool (1) according to claim 1, characterized in that, The grinding head (3) includes a plurality of radially distributed grooves (6a to 6f) on the outer end face (30).

3. The grinding tool (1) according to claim 1 or 2, characterized in that, The grinding head (3) includes a central hole (32) communicating with the axial channel (5), the central hole (32) being closed by an element (7) forming a plug.

4. The grinding tool (1) according to any one of the preceding claims, characterized in that, The abrasive coating (4) contains diamond particles.

5. The grinding tool (1) according to any one of the preceding claims, characterized in that, The grinding head (3) is in the form of a disc-shaped plate.

6. The grinding tool (1) according to any one of the preceding claims, characterized in that, The tool body (2) and the grinding head (3) are integrally formed.

7. The grinding tool (1) according to any one of the preceding claims, characterized in that, The grinding tool is T-shaped.

8. The grinding tool (1) according to any one of the preceding claims, characterized in that, The grinding tool (1) is an electroplated tool.

9. A method for manufacturing the grinding tool (1) according to claim 8, characterized in that, The method includes the following steps: - Process metal blanks to form tool bodies (2) and grinding heads (3) of the required shape and size. - At least one radial groove (6a to 6f) is machined on the outer end face (30) of the grinding head (3) by wire electrical discharge machining, the groove extending from the axial channel (5) formed during the machining of the metal blank to the outer peripheral surface (31) of the grinding head (3). - An abrasive coating (4) is formed on the grinding head (3) by immersion in an electroplating bath. - The at least one groove (6a to 6f) is sealed by covering the outer end face (30) with the abrasive coating formed during the electroplating bath immersion operation, thereby forming the at least one fluid delivery channel (6).

Images