A water-jetting edge grinding wheel and its preparation method

Abstract

This invention discloses a water-grinding edge wheel and its preparation method. The preparation method includes the following steps: (1) Batching: Weigh and prepare the corresponding metal powder according to the metal cutter head formula of the water-grinding edge wheel; (2) Loading: Pour the metal powder into a pre-assembled graphite mold; wherein, by improving the structure of the graphite mold, the metal cutter head is radially pressed and formed in the mold hot pressing process; (3) Radial hot pressing of the cutter head: Radial hot pressing and sintering is performed according to the preset process parameters, so that the metal powder forms an alloy cutter head, and the longitudinal horizontal height of each alloy cutter head is consistent; (4) Welding: Disassemble the graphite mold, take out the cutter head, and weld the metal cutter head to the substrate to obtain the finished water-grinding edge wheel. This edge wheel preparation method ensures that each metal cutter head has the same horizontal height, reduces the consumption of grinding wheels in the grinding / sharpening process, greatly reduces costs, and at the same time, increases the service life of the edge wheel by more than 2 times.

Description

Technical Field

[0001] This invention relates to the field of edge grinding wheel manufacturing technology, and in particular to a water-based edge grinding wheel and its preparation method. Background Technology

[0002] A wet-grinding edge wheel is an abrasive tool that uses diamond as its main abrasive; it is also known as a diamond edge grinding wheel. It possesses extremely high hardness and wear resistance. Wet-grinding edge wheels are widely used in the precision machining and surface treatment of various materials, such as grinding ceramic products like tiles and porcelain, or polishing and grinding stone materials like marble and granite.

[0003] Existing water-based grinding wheels include a base B' and a metal grinding block A' that is directly and integrally formed on the base or formed first and then welded to the base, such as Figure 1 As shown. Most existing water grinding edge grinding wheels are made by hot pressing and sintering. The specific manufacturing process is as follows: (1) Material preparation: Prepare the corresponding metal powder according to the metal cutter head formula; (2) Material loading: Then pour the metal powder into the pre-assembled cutter head forming mold; (3) Hot pressing: Place the cutter head forming mold in the hot pressing equipment for hot pressing and sintering; (4) Grinding: Disassemble the cutter head forming mold and grind the metal cutter head obtained by hot pressing and sintering to meet the size requirements of production; (5) Welding: Finally, weld the metal cutter head that meets the size requirements onto the base body and use a high frequency welding machine to weld to obtain the finished water grinding edge grinding wheel.

[0004] However, in existing hot pressing processes, the cutting head forming mold is placed horizontally inside the hot pressing equipment, and the hot pressing force on the cutting head forming mold is in the vertical direction, that is, the metal cutting head is axially compressed and formed, such as... Figure 1 As shown in direction a, the axial compression forming method of the metal cutter head will result in a certain height difference in the axial (longitudinal) horizontal height of different batches of metal cutter heads. It is necessary to use a grinding wheel to repeatedly and multiple times in the subsequent grinding or sharpening process until the uniform size requirements are met. This process is complicated, the consumption of consumables such as grinding wheels is large, and the processing cost is high.

[0005] In addition, existing water-cooled grinding wheels generate a lot of heat during operation, and most of them need to rely on water cooling systems to cool them during grinding operations. Even so, the metal cutting heads of existing water-cooled grinding wheels wear out significantly, and the service life of the grinding wheels cannot meet the grinding needs of continuous processing in the industry.

[0006] Therefore, it is necessary to improve existing grinding wheels in order to obtain a grinding wheel manufacturing method with low production cost and / or long service life. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide a method for preparing a water-grinding edge wheel.

[0008] The second objective of this invention is to provide a water-grinding edge wheel made by the above-described preparation method.

[0009] One of the objectives of this invention is achieved by the following technical solution: a method for preparing a water-grinding edge grinding wheel, comprising the following steps:

[0010] (1) Ingredients: Weigh and prepare the corresponding metal powder according to the metal cutter head formula of the water grinding wheel;

[0011] (2) Loading: Then pour the metal powder into the pre-assembled graphite mold; wherein, by improving the structure of the graphite mold, the forming chamber of the metal cutter head inside the graphite mold is changed from the axial direction to the radial direction, so that the metal cutter head is radially pressed and formed in the hot pressing process of the mold;

[0012] (3) Radial hot pressing of the cutter head: The graphite mold is placed horizontally in the hot pressing equipment. The hot pressing equipment applies pressure in the radial direction of the metal cutter head. Radial hot pressing and sintering is carried out according to the preset process parameters so that the metal powder forms an alloy cutter head. The longitudinal horizontal height of each alloy cutter head is consistent.

[0013] (4) Welding: Disassemble the graphite mold, take out the cutter head, and weld the metal cutter head onto the substrate to obtain the finished water grinding edge wheel.

[0014] Optionally, in step (1), the metal cutting head of the water grinding wheel includes two layers of abrasive, namely an outer ring abrasive located in the outer ring layer and an inner ring abrasive located in the inner ring layer, wherein the outer ring layer is a fine grinding layer and the inner ring layer is a wear-resistant layer.

[0015] Optionally, the outer abrasive is prepared from the following components in parts by weight: 1.0 to 2.4 parts diamond, 30 to 34 parts copper, 3 to 8 parts nickel, 2.0 to 3.5 parts tin, 0.5 to 2.5 parts rare earth elements, and 0.3 to 1.15 parts paraffin wax;

[0016] The inner abrasive is prepared from the following components in parts by weight: 1.0-2.4 parts diamond, 30-34 parts copper, 32-42 parts iron, 3-8 parts nickel, 8-19 parts cobalt, 2.0-3.5 parts tin, 0.5-2.5 parts rare earth elements, and 0.3-1.15 parts paraffin wax.

[0017] Optionally, in step (2), the graphite mold includes multiple longitudinally and transversely arranged edge strips, which are spliced ​​together to form multiple forming cavities for radial force on the metal cutter head. Each forming cavity corresponds to the processing of one metal cutter head. Each forming cavity is provided with a set of forming pressure heads. Each set of forming pressure heads includes a concave pressure head and a convex pressure head. The concave curvature of the concave pressure head is adapted to the size of the outer circumferential curvature of the grinding wheel, and the convex pressure head and the outer convex curvature are adapted to the size of the inner circumferential curvature of the grinding wheel.

[0018] Specifically, first, the concave pressure head is placed at the bottom of the pre-assembled forming cavity, with the concave part of the pressure head facing upwards; the metal powder required for each metal cutter head is weighed and poured in; then, the convex pressure head is used to press the metal powder, with the convex part of the convex pressure head facing downwards; and so on, each forming cavity in the graphite mold is fitted with a forming pressure head and metal powder; an outer mold frame is fitted over the outside of the graphite mold, and the graphite mold is locked inside the outer mold frame to prevent the graphite mold from falling out, thus completing the loading process.

[0019] Optionally, in step (2), a plurality of forming protrusions for forming the drain groove on the water grinding wheel are provided on the concave part of the concave head;

[0020] The drainage groove on the water grinding wheel is integrally formed with the metal cutting head.

[0021] Optionally, in step (2), multiple positioning screws for locking the graphite mold are provided on the outer periphery of the outer mold frame; a heat insulation plate and an iron plate are added between the outer periphery of the graphite mold and the inner wall of the outer mold frame, and the positioning screws on the outer mold frame are tightened so that the graphite mold is tightly joined together.

[0022] Optionally, in step (2), the metal abrasive includes two different powders for forming a metal cutting head with a double-layer structure of an outer ring layer and an inner ring layer; wherein the outer ring layer is a sharp layer and the inner ring layer is a wear-resistant layer;

[0023] Specifically, weigh the outer and inner ring powder required for each double-layer metal cutter head; after installing the concave head, pour in the outer and inner ring powders in two separate batches, then install the convex head and press; the remaining steps remain unchanged.

[0024] Optionally, in step (3), the graphite mold is placed in the center of the hot press equipment workbench, and the graphite mold is adjusted so that the center of the upper and lower pressure surfaces of the mold and the center of the upper and lower pressure heads of the hot press equipment are on the same vertical straight line; the preset process parameters are as follows: temperature is 700-900℃, pressure is 0.1-0.5 tons, and heat preservation time is 10-20min.

[0025] Optionally, in step (4), before welding, the removed metal blade is placed on a grinder to grind the oxide layer on the welding surface of the metal blade clean and smooth, and remove the burrs from the edges and corners.

[0026] During welding, a high-frequency welding machine is used, with an anode voltage of 8-11KV, an anode current of 1.8-2.5A, and a gate voltage of 0.5-0.8A.

[0027] The second objective of this invention is achieved by the following technical solution: a water-grinding edge grinding wheel, which is prepared by the water-grinding edge grinding wheel preparation method described above.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] Compared with existing processing techniques, the grinding wheel preparation method of this invention changes the pressure direction of each metal cutter head, that is, the axial force is changed to the radial force. This grinding wheel preparation method ensures that each metal cutter head has the same horizontal height, reduces the consumption of grinding wheels in the grinding / sharpening process, greatly reduces costs, and at the same time, increases the service life of the grinding wheel by more than 2 times. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the force direction during the hot pressing of the metal cutting head of the grinding wheel in the prior art.

[0031] Figure 2 This is a schematic diagram of the structure of the water-grinding edge grinding wheel in the preferred embodiment 2 of the present invention;

[0032] Figure 3 This is a schematic diagram of the metal cutter head in the water grinding wheel of the preferred embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the graphite mold and outer mold frame according to a preferred embodiment of the present invention;

[0034] Figure 5 This is a partial structural diagram of a graphite mold according to a preferred embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the forming pressure head and metal cutting head in the graphite mold according to a preferred embodiment of the present invention;

[0036] in,

[0037] A', Metal cutting tip; B', Substrate;

[0038] A. Metal cutting tip; A1. Outer ring layer; A2. Inner ring layer; B. Substrate;

[0039] 1. Graphite mold; 11. Edge strip; 12. Molding cavity; 13. Molding head; 131. Concave head; 1311. Molding convex strip; 132. Convex head; 2. Outer mold frame; 21. Positioning screw; 3. Heat insulation plate; 4. Iron plate;

[0040] a) Axial compression forming direction of the metal cutter head; b) Radial compression forming direction of the metal cutter head. Detailed Implementation

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0042] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the art. Unless otherwise specified, the methods in the following embodiments are conventional methods in the art.

[0043] This invention provides a method for preparing a water-grinding edge wheel, comprising the following steps:

[0044] (1) Ingredients: Weigh and prepare the corresponding metal powder according to the metal cutter head formula of the water grinding wheel;

[0045] (2) Loading: Then pour the metal powder into the pre-assembled graphite mold; wherein, by improving the structure of the graphite mold, the forming chamber of the metal cutter head inside the graphite mold is changed from the axial direction to the radial direction, so that the metal cutter head is radially pressed and formed in the hot pressing process of the mold;

[0046] (3) Radial hot pressing of the cutter head: The graphite mold is placed horizontally in the hot pressing equipment. The hot pressing equipment applies pressure in the radial direction of the metal cutter head. Radial hot pressing and sintering is carried out according to the preset process parameters so that the metal powder forms an alloy cutter head. The longitudinal horizontal height of each alloy cutter head is consistent.

[0047] (4) Welding: Disassemble the graphite mold, take out the cutting head, and weld the metal cutting head onto the substrate to obtain the finished water grinding edge wheel, as shown in Figure 2-3.

[0048] As a further implementation, in step (1), the metal cutting head of the water grinding wheel includes two layers of abrasive, namely the outer ring abrasive in the outer ring layer and the inner ring abrasive in the inner ring layer, wherein the outer ring layer is a fine grinding layer and the inner ring layer is a wear-resistant layer.

[0049] As a further embodiment, the outer ring abrasive is prepared from the following components in parts by weight: 1.0-2.4 parts diamond, 30-34 parts copper, 3-8 parts nickel, 2.0-3.5 parts tin, 0.5-2.5 parts rare earth elements, and 0.3-1.15 parts paraffin wax.

[0050] The inner abrasive is prepared from the following components in parts by weight: 1.0-2.4 parts diamond, 30-34 parts copper, 32-42 parts iron, 3-8 parts nickel, 8-19 parts cobalt, 2.0-3.5 parts tin, 0.5-2.5 parts rare earth elements, and 0.3-1.15 parts paraffin wax.

[0051] As a further implementation, in step (2), such as Figure 4-6As shown, the graphite mold 1 includes multiple longitudinally and transversely arranged edge strips 11. The multiple edge strips are spliced ​​together to form multiple forming cavities 12 for radial force on the metal cutter head. Each forming cavity corresponds to the processing of one metal cutter head. Each forming cavity is provided with a set of forming pressure heads 13. Each set of forming pressure heads includes a concave pressure head 131 and a convex pressure head 132. The concave curvature of the concave pressure head is adapted to the size of the outer circumference curvature of the grinding wheel, and is used to form the outer circumference shape of the metal cutter head A. The convex pressure head and the convex curvature of the convex pressure head are adapted to the size of the inner circumference curvature of the grinding wheel, and are used to form the inner circumference shape of the metal cutter head A.

[0052] Specifically, first, the concave pressure head is placed at the bottom of the pre-assembled forming cavity, with the concave part of the pressure head facing upwards; the metal powder required for each metal cutter head is weighed and poured in; then, the convex pressure head is used to press the metal powder against the convex part, with the convex part of the convex pressure head facing downwards, as shown below. Figure 6 As shown; and so on, each molding cavity in the graphite mold is fitted with a molding head and metal powder; an outer mold frame 2 is fitted over the outside of the graphite mold to lock the graphite mold inside the outer mold frame so that the graphite mold will not fall out, thus completing the loading.

[0053] In this embodiment, the outer diameter of the substrate is 150-700mm, the cross-sectional width of the outer ring layer is 5-15mm, the cross-sectional width of the inner ring layer is 10-20mm, the height of the grinding wheels of the outer and inner ring layers is 2-20mm, and the metal cutting heads are arranged in a continuous or intermittent ring shape. When they are arranged in an intermittent pattern, the interval range is 1-10mm.

[0054] As a further embodiment, in step (2), a plurality of shaped protrusions are provided on the concave part of the concave pressure head to form the drainage grooves on the water grinding edge wheel; the drainage grooves on the water grinding edge wheel are integrally formed with the metal cutting head. This application designs shaped protrusions on the concave pressure head to form multiple drainage grooves arranged at equal intervals, so that when the grinding edge wheel is working, cooling water can be quickly introduced directly into the outer circumference and inner diameter of the working grinding surface, thereby effectively reducing the temperature of the diamond cutting head, effectively improving the wear resistance of the diamond cutting head and the grinding edge wheel, increasing the service life of the grinding edge wheel, and meeting the grinding needs of long-term continuous processing. Compared with conventional grinding edge wheels without drainage groove structure, its grinding time will increase by more than 40%.

[0055] As a further implementation, in step (2), multiple positioning screws 21 for locking the graphite mold are provided on the outer periphery of the outer mold frame; a heat insulation plate 3 and an iron plate 4 are added between the outer periphery of the graphite mold and the inner wall of the outer mold frame, and the positioning screws on the outer mold frame are tightened so that the graphite mold is tightly joined together.

[0056] As a further embodiment, in step (2), the metal abrasive includes two different powders for forming a metal cutting head with a double-layer structure of an outer ring layer and an inner ring layer; wherein the outer ring layer is a sharp layer and the inner ring layer is a wear-resistant layer;

[0057] As a further implementation, weigh the outer ring powder and inner ring powder required for each double-layer metal cutter head; after installing the concave pressure head, pour in the outer ring powder and inner ring powder in two separate batches, then install the convex pressure head and press, with the remaining steps unchanged.

[0058] As a further implementation, in step (3), the graphite mold is placed in the center of the hot press equipment workbench, and the graphite mold is adjusted so that the center of the upper and lower pressure surfaces of the mold and the center of the upper and lower pressure heads of the hot press equipment are on the same vertical straight line; the preset process parameters are as follows: temperature is 700-900℃, pressure is 0.1-0.5 tons, and heat preservation time is 10-20min.

[0059] As a further implementation, in step (4), before welding, the removed metal blade is placed on a grinder to grind the oxide layer on the welding surface of the metal blade clean and smooth, and remove the burrs from the edges and corners.

[0060] During welding, a high-frequency welding machine is used, with an anode voltage of 8-11KV, an anode current of 1.8-2.5A, and a gate voltage of 0.5-0.8A.

[0061] The present invention also provides a water-grinding edge grinding wheel, which is prepared by the water-grinding edge grinding wheel preparation method described above.

[0062] The following are specific embodiments of the present invention. Unless otherwise specified, the raw materials, equipment and other materials used in the following embodiments can be obtained by purchasing.

[0063] Example 1

[0064] A water-cooled edge-grinding wheel includes a base and metal cutting heads welded to the base. In this embodiment, the outer diameter of the base is 3000 mm, and each metal cutting head has a cross-sectional width of 15 mm and a height of 20 mm. The metal cutting heads are arranged in a continuous or spaced-apart ring, with a spacing of 1 mm when they are spaced out. The edge-grinding wheel is prepared by the following steps:

[0065] (1) Ingredients: Weigh and prepare the corresponding metal powder according to the metal cutter head formula of the water grinding wheel;

[0066] In step (1), the metal cutting head of the water grinding wheel is prepared from the following components in parts by weight: 2 parts diamond, 33 parts copper, 5 parts nickel, 2.5 parts tin, 1.5 parts rare earth elements, and 1 part paraffin wax.

[0067] (2) Loading: Then pour the metal powder into the pre-assembled molding cavity of the graphite mold; the specific assembly process is as follows: first, place the concave head at the bottom of the pre-assembled molding cavity, with the concave part of the concave head facing upward; weigh the metal powder required for each metal cutter head and pour the metal powder into the molding cavity; then press the metal powder with the convex head, with the convex part of the convex head facing downward; and so on, install the molding head and pour the metal powder into each molding cavity of the graphite mold; put an outer mold frame on the outside of the graphite mold and lock the graphite mold in the outer mold frame. The outer periphery of the outer mold frame is provided with multiple positioning screws for locking the graphite mold; add a heat insulation plate and an iron plate between the outer periphery of the graphite mold and the inner wall of the outer mold frame, and tighten the positioning screws on the outer mold frame so that the graphite mold and the outer mold frame are tightly combined and the graphite mold will not fall out, thus completing the loading.

[0068] In this embodiment, the graphite mold used is as follows: Figure 4-6 As shown, it specifically includes multiple longitudinally and transversely arranged edge strips, which are spliced ​​together to form multiple forming cavities for radial force application to the metal cutting head. Each forming cavity corresponds to the processing of one metal cutting head. Each forming cavity is equipped with a set of forming pressure heads. Each set of forming pressure heads includes a concave pressure head and a convex pressure head. The concave curvature of the concave pressure head matches the outer circumference curvature of the grinding wheel, and the convex pressure head matches the inner circumference curvature of the grinding wheel. Three forming protrusions 1311 are provided on the concave part of the concave pressure head to form the drainage groove on the water grinding wheel; the drainage groove on the water grinding wheel is integrally formed with the metal cutting head.

[0069] (3) Radial hot pressing of the cutter head: The graphite mold is placed horizontally in the hot pressing equipment. The hot pressing equipment applies pressure in the radial direction of the metal cutter head. Radial hot pressing and sintering is carried out according to the preset process parameters so that the metal powder forms an alloy cutter head. The longitudinal horizontal height of each alloy cutter head is consistent.

[0070] In step (3), the graphite mold is placed in the center of the hot press equipment workbench, and the graphite mold is adjusted so that the center of the upper and lower pressure surfaces of the mold is on the same vertical straight line as the center of the upper and lower pressure heads of the hot press equipment; the preset process parameters are as follows: temperature is 700℃, pressure is 0.1 tons, and heat preservation time is 10min.

[0071] (4) Welding: Disassemble the graphite mold and remove the cutting head; before welding, place the removed metal cutting head on a grinder to grind the oxide layer on the welding surface of the metal cutting head clean and smooth, and remove the burrs from the edges. Weld the metal cutting head onto the substrate, specifically using a high-frequency welding machine, with an anode voltage of 8KV, an anode current of 1.8A, and a grid voltage of 0.5A, to obtain the finished water grinding edge wheel.

[0072] Example 2

[0073] A water-cooled grinding wheel with dual-layer abrasives includes a base B and a metal cutting head A welded to the base B. The metal cutting head comprises an outer ring A1 and an inner ring A2, composed of two types of abrasives, such as... Figure 2-3 As shown, in this embodiment, the outer diameter of the substrate B is 300 mm, the cross-sectional width of the outer ring layer A1 of each metal cutting head is 5 mm, the cross-sectional width of the inner ring layer A2 is 10 mm, and the height of the grinding wheels for the outer ring layer A1 and the inner ring layer A2 is 20 mm. The metal cutting heads are arranged in a continuous or intermittent ring pattern, with an interval of 1 mm when they are intermittently arranged. The grinding wheel is prepared by the following steps:

[0074] (1) Ingredients: Weigh and prepare the corresponding metal powder according to the metal cutter head formula of the water grinding wheel;

[0075] In step (1), the metal cutting head of the water grinding wheel includes two layers of abrasive, namely an outer ring abrasive in the outer ring layer and an inner ring abrasive in the inner ring layer. The outer ring abrasive is prepared from the following components in parts by weight: 2.4 parts diamond, 32 parts copper, 6 parts nickel, 2.5 parts tin, 1.5 parts rare earth elements, and 0.85 parts paraffin wax.

[0076] The inner abrasive is prepared from the following components in parts by weight: 2.2 parts diamond, 30 parts copper, 35 parts iron, 6 parts nickel, 13 parts cobalt, 2.5 parts tin, 2.5 parts rare earth elements, and 0.8 parts paraffin.

[0077] (2) Loading: The metal abrasive includes two different powders for forming a metal cutter head with an outer ring layer and an inner ring layer double structure; weigh the outer ring powder and inner ring powder required for each double-layer metal cutter head respectively;

[0078] The specific assembly process is as follows: First, place the concave pressure head at the bottom of the pre-assembled molding cavity, with the concave part of the pressure head facing upwards; after installing the concave pressure head, pour the outer ring powder and inner ring powder in two separate pours, then press the metal powder with the convex pressure head, with the convex part of the convex pressure head facing downwards; repeat this process to install the molding pressure head and pour metal powder into each molding cavity in the graphite mold; fit an outer mold frame around the outside of the graphite mold and lock the graphite mold inside the outer mold frame; multiple positioning screws are provided on the outer periphery of the outer mold frame for locking the graphite mold; add a heat insulation plate and an iron plate between the outer periphery of the graphite mold and the inner wall of the outer mold frame, and tighten the positioning screws on the outer mold frame to ensure that the graphite mold and the outer mold frame are tightly joined together, preventing the graphite mold from falling out, thus completing the loading process.

[0079] In this embodiment, the graphite mold used is as follows: Figure 4-6As shown, the specific design includes multiple longitudinally and transversely arranged edge strips, which are spliced ​​together to form multiple forming cavities for radial force application to the metal cutting head. Each forming cavity corresponds to the processing of one metal cutting head. Each forming cavity is equipped with a set of forming pressure heads. Each set of forming pressure heads includes a concave pressure head and a convex pressure head. The concave curvature of the concave pressure head matches the outer circumferential curvature of the grinding wheel, and the convex pressure head matches the inner circumferential curvature of the grinding wheel. Three forming protrusions 1311 are provided on the concave part of the concave pressure head to form the drainage groove on the water-grinding grinding wheel; the drainage groove on the water-grinding grinding wheel is integrally formed with the metal cutting head. This graphite mold structure transforms the forming cavity of the metal cutting head within the graphite mold from an axial direction to a radial direction, so that the metal cutting head is radially pressure-formed during the hot pressing process of the mold. Figure 6 / Figure 1 As shown in the direction of b.

[0080] (3) Radial hot pressing of the cutter head: The graphite mold is placed horizontally in the hot pressing equipment. The hot pressing equipment applies pressure in the radial direction of the metal cutter head. Radial hot pressing and sintering is carried out according to the preset process parameters so that the metal powder forms an alloy cutter head. The longitudinal horizontal height of each alloy cutter head is consistent.

[0081] In step (3), the graphite mold is placed in the center of the hot press equipment workbench, and the graphite mold is adjusted so that the center of the upper and lower pressure surfaces of the mold is on the same vertical straight line as the center of the upper and lower pressure heads of the hot press equipment; the preset process parameters are as follows: temperature is 800℃, pressure is 0.3 tons, and heat preservation time is 15min.

[0082] (4) Welding: Disassemble the graphite mold and remove the cutting head; before welding, place the removed metal cutting head on a grinder to grind the oxide layer on the welding surface of the metal cutting head clean and smooth, and remove the burrs from the edges. Weld the metal cutting head onto the substrate, specifically using a high-frequency welding machine, with an anode voltage of 10KV, an anode current of 2.2A, and a grid voltage of 0.75A, to obtain the finished water grinding edge wheel.

[0083] Example 3

[0084] A water-cooled grinding wheel with dual-layer abrasives includes a base B and a metal cutting head A welded to the base B. The metal cutting head comprises an outer ring A1 and an inner ring A2, both composed of two types of abrasives, such as... Figure 2-3 As shown, in this embodiment, the outer diameter of the substrate B is 300 mm, the cross-sectional width of the outer ring layer A1 of each metal cutting head is 5 mm, the cross-sectional width of the inner ring layer A2 is 10 mm, and the height of the grinding wheels for the outer ring layer A1 and the inner ring layer A2 is 20 mm. The metal cutting heads are arranged in a continuous or intermittent ring pattern, with an interval of 1 mm when they are intermittently arranged. The grinding wheel is prepared by the following steps:

[0085] (1) Ingredients: Weigh and prepare the corresponding metal powder according to the metal cutter head formula of the water grinding wheel;

[0086] In step (1), the metal cutting head of the water grinding wheel includes two layers of abrasive, namely an outer ring abrasive in the outer ring layer and an inner ring abrasive in the inner ring layer. The outer ring abrasive is prepared from the following components in parts by weight: 1.0 part diamond, 30 parts copper, 3 parts nickel, 2.0 parts tin, 0.5 parts rare earth elements, and 0.3 parts paraffin.

[0087] The inner abrasive is prepared from the following components in parts by weight: 2.4 parts diamond, 34 parts copper, 42 parts iron, 8 parts nickel, 19 parts cobalt, 3.5 parts tin, 2.5 parts rare earth elements, and 1.15 parts paraffin.

[0088] (2) Loading: The metal abrasive includes two different powders for forming a metal cutter head with an outer ring layer and an inner ring layer double structure; weigh the outer ring powder and inner ring powder required for each double-layer metal cutter head respectively;

[0089] The specific assembly process is as follows: First, place the concave pressure head at the bottom of the pre-assembled molding cavity, with the concave part of the pressure head facing upwards; after installing the concave pressure head, pour the outer ring powder and inner ring powder in two separate pours, then press the metal powder with the convex pressure head, with the convex part of the convex pressure head facing downwards; repeat this process to install the molding pressure head and pour metal powder into each molding cavity in the graphite mold; fit an outer mold frame around the outside of the graphite mold and lock the graphite mold inside the outer mold frame; multiple positioning screws are provided on the outer periphery of the outer mold frame for locking the graphite mold; add a heat insulation plate and an iron plate between the outer periphery of the graphite mold and the inner wall of the outer mold frame, and tighten the positioning screws on the outer mold frame to ensure that the graphite mold and the outer mold frame are tightly joined together, preventing the graphite mold from falling out, thus completing the loading process.

[0090] In this embodiment, the graphite mold used is as follows: Figure 4-6 As shown, the system specifically includes multiple longitudinally and transversely arranged edge strips, which are spliced ​​together to form multiple forming cavities for radial force application to the metal cutting head. Each forming cavity corresponds to the processing of one metal cutting head. Each forming cavity is equipped with a set of forming pressure heads. Each set of forming pressure heads includes a concave pressure head and a convex pressure head. The concave curvature of the concave pressure head matches the outer circumferential curvature of the grinding wheel, and the convex pressure head matches the inner circumferential curvature of the grinding wheel. Three forming protrusions 1311 are provided on the concave part of the concave pressure head to form the drainage groove on the water-grinding grinding wheel. The drainage groove on the water-grinding grinding wheel is integrally formed with the metal cutting head. This graphite mold structure transforms the forming cavity of the metal cutting head within the graphite mold from an axial direction to a radial direction, so that the metal cutting head is radially pressure-formed during the hot pressing process of the mold.

[0091] (3) Radial hot pressing of the cutter head: The graphite mold is placed horizontally in the hot pressing equipment. The hot pressing equipment applies pressure in the radial direction of the metal cutter head. Radial hot pressing and sintering is carried out according to the preset process parameters so that the metal powder forms an alloy cutter head. The longitudinal horizontal height of each alloy cutter head is consistent.

[0092] In step (3), the graphite mold is placed in the center of the hot press equipment workbench, and the graphite mold is adjusted so that the center of the upper and lower pressure surfaces of the mold is on the same vertical straight line as the center of the upper and lower pressure heads of the hot press equipment; the preset process parameters are as follows: temperature is 900℃, pressure is 0.5 tons, and heat preservation time is 20min.

[0093] (4) Welding: Disassemble the graphite mold and remove the cutting head; before welding, place the removed metal cutting head on a grinder to grind the oxide layer on the welding surface of the metal cutting head clean and smooth, and remove the burrs from the edges. Weld the metal cutting head onto the substrate, specifically using a high-frequency welding machine, with an anode voltage of 11KV, an anode current of 2.5A, and a grid voltage of 0.8A, to obtain the finished water grinding edge wheel.

[0094] Comparative Example 1

[0095] A water-based edge-grinding wheel includes a base B and metal cutter heads A welded to the base. The metal cutter heads are composed of an abrasive. In this embodiment, the outer diameter of the base is 300 mm, and each metal cutter head has a cross-sectional width of 15 mm and a height of 20 mm. The metal cutter heads are arranged in a continuous or spaced-apart ring. When arranged at intervals, the interval range is 1 mm. This edge-grinding wheel is prepared by the following steps:

[0096] It is manufactured using a hot-pressing and sintering method. The specific manufacturing process is as follows:

[0097] (1) Ingredients: Prepare the corresponding metal powder according to the metal cutter head formula, and use the metal powder of the outer ring layer in Example 2;

[0098] (2) Loading: Then pour the metal powder into the pre-assembled cutter head forming mold;

[0099] (3) Axial hot pressing: The existing cutter head forming mold is placed in a hot pressing equipment for hot pressing sintering. The metal cutter head is formed by axial hot pressing, using the hot pressing conditions of Example 2.

[0100] (4) Grinding: Disassemble the cutting head forming mold and repeatedly grind the metal cutting head obtained by hot pressing and sintering until it meets the size required for production.

[0101] (5) Welding: Finally, the metal blade that meets the size requirements is welded onto the base body. The welding is carried out using a high-frequency welding machine and the welding conditions of Example 2 are used to obtain the finished water grinding edge wheel.

[0102] Comparative Example 2

[0103] A double-layer abrasive water-based grinding wheel, compared to Example 2, differs in that, in step (3) of the preparation method, during the radial hot pressing of the cutting head, the preset process parameters are as follows: temperature 600℃, pressure 0.05 tons, and holding time 5 minutes. The remaining formula and process parameters are the same as in Example 2.

[0104] Comparative Example 3

[0105] A double-layer abrasive water grinding wheel, compared with Example 2, differs in Comparative Example 3 in that, in step (3) of the preparation method, the preset process parameters in the radial hot pressing of the cutter head are as follows: temperature is 900℃, pressure is 0.6 tons, and holding time is 25 min. The remaining formula and process parameters are the same as in Example 2.

[0106] Comparative Example 4

[0107] A double-layer abrasive water grinding edge wheel, compared with Example 2, the difference of Comparative Example 4 is that in the welding step (4) of the preparation method, the welding conditions of the high-frequency welding machine are: the anode voltage is 5KV, the anode current is 1.5A, the gate voltage is 0.45A, and the other formulas and process parameters are the same as those of Example 2.

[0108] Comparative Example 5

[0109] A double-layer abrasive water grinding edge wheel, compared with Example 2, the difference of Comparative Example 5 is that in the welding of step (4) of the preparation method, the welding conditions of the high-frequency welding machine are: the anode voltage is 12KV, the anode current is 3A, the gate voltage is 0.85A, and the other formulas and process parameters are the same as those of Example 2.

[0110] Effect evaluation and performance testing

[0111] The performance and processing cost of the grinding wheels for each example were measured. Specific items and results are shown in Table 1.

[0112] 1. Grinding wheel consumption refers to the amount of grinding wheel consumption required to remove or grind away the oxide layer and dimensions of the metal cutting head obtained after hot pressing. Using grinding wheels of the same manufacturer and specification (φ250), and under the same conditions, the grinding wheels of each example are ground, and the number of grinding wheels that can be ground by one grinding wheel is counted. The more grinding wheels that are ground, the more inconsistent the initial dimensions of the products, and the less consumable material is needed.

[0113] 2. Processing cost per grinding wheel refers to the average comprehensive cost of processing each grinding wheel according to the specific processing method of this invention or existing processing methods, specifically including the sum of costs for raw materials, electricity, consumables, etc.

[0114] 3. The service life of a grinding wheel refers to the total grinding time taken for the grinding wheel to become unusable after grinding ceramic tiles of the same specifications from the same batch from the same manufacturer. This service life is calculated in hours.

[0115] Table 1 shows the performance test data of the grinding wheels for each example.

[0116]

[0117] Compared with existing processing techniques, the grinding wheel preparation method of this invention changes the pressure direction of each metal cutter head, that is, the axial force is changed to the radial force. This grinding wheel preparation method ensures that each metal cutter head has the same horizontal height, reduces the consumption of grinding wheels in the grinding / sharpening process, greatly reduces costs, and at the same time, increases the service life of the grinding wheel by more than 2 times.

[0118] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A method for preparing a water-jetting edge grinding wheel, characterized in that, Includes the following steps: (1) Ingredients: Weigh and prepare the corresponding metal powder according to the metal cutter head formula of the water grinding wheel; (2) Loading: Then pour the metal powder into the pre-assembled graphite mold; wherein, by improving the structure of the graphite mold, the forming chamber of the metal cutter head inside the graphite mold is changed from the axial direction to the radial direction, so that the metal cutter head is radially pressed and formed in the hot pressing process of the mold. The graphite mold includes multiple longitudinally and transversely arranged edge strips, which are spliced ​​together to form multiple forming cavities for radial force on the metal cutting head. Each forming cavity corresponds to the processing of one metal cutting head. Each forming cavity is provided with a set of forming pressure heads. Each set of forming pressure heads includes a concave pressure head and a convex pressure head. The inner concave arc of the concave pressure head is adapted to the size of the outer circumferential arc of the grinding wheel, and the outer convex arc of the convex pressure head is adapted to the size of the inner circumferential arc of the grinding wheel. (3) Radial hot pressing of the cutter head: The graphite mold is placed horizontally in the hot pressing equipment. The hot pressing equipment applies pressure in the radial direction of the metal cutter head. Radial hot pressing and sintering is carried out according to the preset process parameters so that the metal powder forms an alloy cutter head. The longitudinal horizontal height of each alloy cutter head is consistent. (4) Welding: Disassemble the graphite mold, take out the cutting head, and weld the metal cutting head onto the substrate to obtain the finished water grinding edge wheel.

2. The method for preparing the water-grinding edge wheel as described in claim 1, characterized in that, In step (1), the metal cutting head of the water grinding wheel includes two layers of abrasive, namely the outer ring abrasive in the outer ring layer and the inner ring abrasive in the inner ring layer, wherein the outer ring layer is a fine grinding layer and the inner ring layer is a wear-resistant layer.

3. The method for preparing the water-grinding edge wheel as described in claim 2, characterized in that, The outer abrasive is prepared from the following components in parts by weight: 1.0-2.4 parts diamond, 30-34 parts copper, 3-8 parts nickel, 2.0-3.5 parts tin, 0.5-2.5 parts rare earth elements, and 0.3-1.15 parts paraffin wax; The inner abrasive is prepared from the following components in parts by weight: 1.0-2.4 parts diamond, 30-34 parts copper, 32-42 parts iron, 3-8 parts nickel, 8-19 parts cobalt, 2.0-3.5 parts tin, 0.5-2.5 parts rare earth elements, and 0.3-1.15 parts paraffin wax.

4. The method for preparing the water-grinding edge wheel as described in claim 1, characterized in that, In step (2), the concave pressure head is first placed at the bottom of the pre-assembled forming cavity with the concave part of the pressure head facing upward; the metal powder required for each metal cutter head is weighed and poured in; then the convex pressure head is pressed against the metal powder with the convex part of the pressure head facing downward; and so on, each forming cavity in the graphite mold is fitted with a forming pressure head and metal powder; an outer mold frame is fitted on the outside of the graphite mold to lock the graphite mold in the outer mold frame so that the graphite mold will not fall out, thus completing the loading.

5. The method for preparing the water-grinding edge wheel as described in claim 4, characterized in that, In step (2), the concave part of the concave head is provided with a plurality of forming protrusions for forming the drain groove on the water grinding wheel; The drainage groove on the water grinding wheel is integrally formed with the metal cutting head.

6. The method for preparing the water-grinding edge wheel as described in claim 4, characterized in that, In step (2), multiple positioning screws for locking the graphite mold are provided on the outer periphery of the outer mold frame; a heat insulation plate and an iron plate are added between the outer periphery of the graphite mold and the inner wall of the outer mold frame, and the positioning screws on the outer mold frame are tightened to make the graphite mold tightly joined together.

7. The method for preparing the water-grinding edge wheel as described in claim 4, characterized in that, In step (2), the metal powder includes two different powders for forming a metal cutting head with a double-layer structure of an outer ring layer and an inner ring layer; wherein the outer ring layer is a sharp layer and the inner ring layer is a wear-resistant layer; Specifically, weigh the outer and inner ring powder required for each double-layer metal cutter head; after installing the concave head, pour in the outer and inner ring powder in two separate batches, then install the convex head, and keep the other steps unchanged.

8. The method for preparing the water-grinding edge wheel as described in claim 1, characterized in that, In step (3), the graphite mold is placed in the center of the hot press equipment workbench, and the graphite mold is adjusted so that the center of the upper and lower pressure surfaces of the mold and the center of the upper and lower pressure heads of the hot press equipment are on the same vertical straight line; the preset process parameters are as follows: temperature is 700-900℃, pressure is 0.1-0.5 tons, and heat preservation time is 10-20min.

9. The method for preparing the water-grinding edge wheel as described in claim 1, characterized in that, In step (4), before welding, the removed metal blade is placed on a grinder to grind the oxide layer on the welding surface of the metal blade clean and smooth, and remove the burrs from the edges and corners. During welding, a high-frequency welding machine is used, with an anode voltage of 8-11KV, an anode current of 1.8-2.5A, and a gate voltage of 0.5-0.8A.

10. A water-powered edge-grinding wheel, characterized in that, It is prepared by the water grinding edge grinding wheel preparation method according to any one of claims 1-9.

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