Grinding tool

Abstract

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

Description

Technical Field

[0001] The present invention relates to a grinding tool, and more particularly 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 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 hard-to-reach areas. Background Technology

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

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

[0005] Another commonly used technology for manufacturing diamond-coated grinding tools is abrasive electrolytic deposition. This technique involves depositing diamond particles onto the tool surface and immersing the tool in an electrolytic bath (usually a nickel electrolytic bath). When electricity is applied, nickel is deposited around the diamond particles and on the tool surface, thus fixing the diamond particles, encapsulated in a 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 diamond-coated grinding tools, it does not solve the problem of overheating during use, which affects tool life and the surface condition of the workpiece.

[0006] The present invention aims to solve the above-mentioned problems related to grinding tools by providing a grinding tool that can prevent or at least limit the risk of overheating during use, regardless of the accessibility of the operating area of ​​the grinding tool, while giving the grinding tool a longer service life.

[0007] Another objective of this invention is to provide a grinding tool that can perform precise, high-quality grinding while preserving the surface condition of both the workpiece and the grinding tool itself. Summary of the Invention

[0008] Therefore, 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 this grinding tool is that it includes a channel structure comprising an axial channel and at least one fluid delivery channel. The axial channel extends from the second end through the tool body over a given length of the tool body. The fluid delivery channel is arranged to mate with the axial channel to allow cooling and / or lubricating fluid introduced at the second end into the axial channel to be ejected through the grinding head. The grinding head has an outer end face defined by an outer peripheral surface having at least one groove extending radially from the axial channel to the outer peripheral surface. The at least one groove is closed along its length by the abrasive coating to form the at least one fluid delivery channel.

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

[0011] Another advantage of this channel structure is that it enables robust and rigid tool designs, 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 contains diamond particles.

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

[0016] Advantageously, the tool body and the grinding head are made as a single unit.

[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 channels are located 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 tools are electroplated tools. The manufacture of grinding tools, more specifically, involves applying an abrasive coating to the grinding head through electroplating, which enables the rapid production of sharp and highly durable grinding tools.

[0019] The present invention also relates to a method for manufacturing the above-mentioned grinding tool, the method comprising the following steps:

[0020] - Machining metal blanks to form tool bodies and grinding heads of the required shape and size.

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

[0022] - An abrasive coating is formed on the grinding head by immersion in an electroplating bath.

[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. Attached Figure Description

[0024] Other features and advantages of the invention will become apparent from the detailed description of the invention provided by way of example with reference to the accompanying drawings, in which:

[0025] Figure 1 A perspective view of a grinding tool according to an exemplary embodiment of the present invention is shown.

[0026] Figure 2 Show Figure 1 A perspective view of the grinding tools before the electroplating operation.

[0027] Figure 3 A cross-sectional view of the electroplated grinding tool along axis III-III is shown.

[0028] Figure 4 Show Figure 3 A schematic partial side view of the grinding head on a grinding tool. Detailed Implementation

[0029] Figure 1 A perspective view of a grinding tool 1 according to an exemplary embodiment of the present invention is shown.

[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 with 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, preferably flat, surrounded by an outer peripheral face 31, both of which are coated with abrasive particles. The abrasive coating 4 advantageously comprises diamond abrasive particles. According to a variant embodiment, it is contemplated that the abrasive coating comprises 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 just an 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. Therefore, 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 over 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 below. Figure 2 and Figure 3 As shown. An 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 multiple fluid delivery channels 6 arranged at the grinding head 3. These fluid delivery channels 6 are arranged in conjunction 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 the abrasive coating 4.

[0037] More specifically, each groove 6a to 6f extends radially from the axial channel 5 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 openings of the corresponding grooves at the height of the outer end face, form radial channels leading to the outer peripheral surface, which form fluid delivery channels 6.

[0038] like Figure 2 As shown, 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 one 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 workpiece can be 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. In addition, a coaxial channel is manufactured through the workpiece. This channel constitutes the axial channel 5 of the grinding tool 1.

[0041] Next, 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 blank machining 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 laser machining.

[0042] Then, the abrasive particles are bonded to the grinding head 3 by immersion in an electroplating bath. 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 simultaneously sealing the "surface" grooves 6a to 6f. "Surface" refers to the area where material does not enter the grooves 6a to 6f themselves to fill them. Figure 4The abrasive coating 4 is shown to "surface" seal the trench (trench 6d). As shown, the trench is sealed by a 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 trench. 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 acute angles or angles with small radii of curvature of the grinding head 3.

[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 can also be installed at the end openings of each groove 6a to 6f to prevent the ends from being blocked 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 present invention is provided by way of example only. Those skilled in the art will understand that various modifications can be made to the present invention without departing from its scope.

[0046] the term

[0047] 1 Grinding tools

[0048] 2. Main body of the tool

[0049] 3 Grinding head

[0050] 4 Abrasive coating

[0051] 5 Axial Channels

[0052] 6. Fluid delivery channel

[0053] 7. Elements forming the plug

[0054] 6a to 6f trenches

[0055] 20 First End

[0056] 21 Second End

[0057] 30 Outer end face

[0058] 31 Outer Peripheral Surface

[0059] 32 center hole

[0060] 51. Entrance.

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).

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