Water mill edge grinding wheel and preparation method thereof

Abstract

The invention discloses a water mill edge grinding wheel and a preparation method thereof. The preparation method comprises the following steps: (1) burdening: weighing and preparing corresponding metal powder according to a formula of a metal tool bit of the water mill edge grinding wheel; (2) loading: pouring metal powder into a pre-assembled graphite mold; wherein the structure of the graphite die is improved, so that a metal tool bit is radially pressed and formed in the hot pressing process of the die; (3) tool bit radial hot pressing is conducted, specifically, radial hot pressing sintering forming is conducted according to preset technological parameters, so that the metal powder forms alloy tool bits, and the longitudinal horizontal heights of all the alloy tool bits are consistent; and (4) welding: disassembling the graphite mold, taking out the tool bit, and welding the metal tool bit on the base body to obtain a finished product of the water mill edge grinding wheel. According to the edge grinding wheel manufacturing method, it is guaranteed that all the metal tool bits have the same horizontal height, grinding wheel consumption in the grinding / edging procedure is reduced, cost is greatly reduced, and meanwhile the service life of the edge grinding wheel is prolonged by more than two times.

Description

Technical Field

[0001] The invention relates to the technical field of edge grinding wheel manufacturing and processing, and in particular to a water-mill edge grinding wheel and a manufacturing method thereof. Background Art

[0002] Water grinding wheel is a kind of grinding tool which uses diamond as the main abrasive, also known as diamond grinding wheel, which has extremely high hardness and wear resistance. Water grinding wheel is widely used in precision processing and surface treatment of various materials, such as grinding of ceramic products such as tiles and porcelain, or polishing and grinding of stone materials such as marble and granite.

[0003] The existing water-grinding edge grinding wheel comprises a base body B', a metal grinding block A' which is directly integrally formed on the base body or first formed and then welded on the base body, such as Figure 1 As shown. Most of the existing water-grinding edge grinding wheels are made by hot pressing and sintering. The specific production process is as follows: (1) Ingredients: Prepare the corresponding metal powder according to the metal cutter head formula; (2) 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 a size that meets the production requirements; (5) Welding: Finally, weld the metal cutter head that meets the size requirements to the substrate, and use a high-frequency welding machine for welding to obtain a finished water-grinding edge grinding wheel.

[0004] However, in the existing hot pressing process, the cutter head forming mold is placed horizontally in the hot pressing equipment, and the hot pressing force direction of the cutter head forming mold is in the up and down direction, that is, the metal cutter head is axially pressed and formed. Figure 1 In the direction a shown in the figure, the axial pressure forming method of the metal cutter head will cause a certain height difference in the axial (longitudinal) horizontal height of the metal cutter heads in different batches, and it is necessary to use a grinding wheel for repeated and multiple reduction in the subsequent grinding or sharpening process until the uniform size requirements are met. This makes the processing process complicated, the loss of consumables such as grinding wheels is large, and the processing cost is high.

[0005] In addition, existing water-based grinding wheels generate a lot of heat during operation, and most of them need to rely on a water cooling system for cooling during grinding operations. Despite this, the metal cutter head of the existing water-based grinding wheel is generally worn out, and the service life of the grinding wheel cannot meet the industry's continuous processing and grinding needs.

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

[0007] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a method for preparing a water-mill edging wheel.

[0008] The second object of the present invention is to provide a water-mill edging wheel made by the above preparation method.

[0009] One of the purposes of the present invention is achieved by adopting the following technical solution: A method for preparing a water-mill edge grinding wheel comprises the following steps:

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

[0011] (2) Loading: The metal powder is then poured into a pre-assembled graphite mold; wherein, by improving the structure of the graphite mold, the molding chamber of the metal cutter head in the graphite mold is transformed from an axial direction to a radial direction, so that the metal cutter head is radially pressed and molded during the mold hot pressing process;

[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. The radial hot pressing and sintering are 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;

[0013] (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 grinding wheel.

[0014] Optionally, in step (1), the metal cutter head of the water-grinding edging wheel comprises two layers of abrasives, namely an outer ring abrasive located in an outer ring layer and an inner ring abrasive located in an 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 ring abrasive is prepared from the following components in parts by weight: 1.0-2.4 parts of diamond, 30-34 parts of copper, 3-8 parts of nickel, 2.0-3.5 parts of tin, 0.5-2.5 parts of rare earth elements, and 0.3-1.15 parts of paraffin wax;

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

[0017] Optionally, in step (2), the graphite mold includes a plurality of edge strips arranged vertically and horizontally, and the plurality of edge strips are spliced ​​to form a plurality of forming cavities for radially applying force to the metal cutter head, one forming cavity corresponds to one metal cutter head, and each forming cavity is provided with a group of forming pressure heads, each group of forming pressure heads includes a concave pressure head and a convex pressure head, the inner concave curvature of the concave pressure head is adapted to the curvature of the outer periphery of the edging wheel, and the outer convex curvature of the convex pressure head is adapted to the curvature of the inner periphery of the edging wheel;

[0018] Specifically, first place the concave pressure head at the bottom of the pre-assembled forming cavity, with the inner concave part of the concave pressure head facing upward; weigh the metal powder required for each metal cutter head and pour the metal powder; then press the metal powder with the convex pressure head, with the outer convex part of the convex pressure head facing downward; and so on, install the forming pressure head and metal powder in each forming cavity in the graphite mold; put an outer mold frame on the outside of the graphite mold, lock the graphite mold in the outer mold frame so that the graphite mold will not fall out, and complete the loading.

[0019] Optionally, in step (2), a plurality of shaped convex strips are convexly provided on the inner concave position of the concave pressure head for forming a water discharge groove on the water mill edging wheel;

[0020] The drain groove on the water-mill edge grinding wheel is integrally formed with the metal cutter head.

[0021] Optionally, in step (2), a plurality of positioning screws for locking the graphite mold are provided on the periphery of the outer mold frame; a heat insulation plate and an iron plate are added between the 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 tightly combine the graphite mold.

[0022] Optionally, in step (2), the metal abrasive comprises two different powders, which are used to form a metal tool head having a double-layer structure of an outer layer and an inner layer; wherein the outer layer is a sharp layer, and the inner layer is a wear-resistant layer;

[0023] Specifically, weigh the outer ring powder and inner ring powder required for each double-layer metal cutter head respectively; after installing the concave pressure head, pour the outer ring powder and inner ring powder in two times in turn, and then install the convex pressure head to press, and the other steps remain unchanged.

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

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

[0026] During welding, a high-frequency welding machine is used for welding, the anode voltage is 8-11KV, the anode current is 1.8-2.5A, and the grid voltage is 0.5-0.8A.

[0027] The second object of the present invention is achieved by adopting the following technical solution: a water-mill edging wheel is prepared by the water-mill edging wheel preparation method as described above.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] Compared with the existing processing technology, the edge grinding wheel preparation method of the present invention changes the pressure direction of each metal cutter head, that is, the axial force is changed into radial force. The edge grinding wheel preparation method ensures that each metal cutter head has the same horizontal height, reduces the grinding wheel consumption in the grinding / sharpening process, greatly reduces the cost, and at the same time, the service life of the edge grinding wheel is increased by more than 2 times. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the force direction of the hot pressing forming of the metal blade of the edging wheel in the prior art

[0031] Figure 2 This is a schematic structural diagram of a water-mill edging wheel according to a preferred embodiment 2 of the present invention;

[0032] Figure 3 This is a schematic structural diagram of a metal cutter head in a water-mill edging wheel according to a preferred embodiment 2 of the present invention;

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

[0034] Figure 5 It is a schematic diagram of the partial structure of a graphite mold of a preferred embodiment of the present invention;

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

[0036] in,

[0037] A', metal cutter head; B', base body;

[0038] A, metal cutter head; A1, outer layer; A2, inner layer; B, base body;

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

[0040] a. Axial pressure forming direction of the metal cutter head; b. Radial pressure forming direction of the metal cutter head. DETAILED DESCRIPTION

[0041] The present invention is 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 a new embodiment.

[0042] In the present invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following embodiments are all conventional methods in the art unless otherwise specified.

[0043] The present invention provides a method for preparing a water-mill edging wheel, comprising the following steps:

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

[0045] (2) Loading: The metal powder is then poured into a pre-assembled graphite mold; wherein, by improving the structure of the graphite mold, the molding chamber of the metal cutter head in the graphite mold is transformed from an axial direction to a radial direction, so that the metal cutter head is radially pressed and molded during the mold hot pressing process;

[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. The radial hot pressing and sintering are 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;

[0047] (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 grinding wheel, as shown in Figure 2-3.

[0048] As a further embodiment, in step (1), the metal cutter head of the water-grinding edging wheel includes two layers of abrasives, 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.

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

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

[0051] As a further embodiment, in step (2), if Figure 4-6As shown, the graphite mold 1 includes a plurality of edge strips 11 arranged vertically and horizontally, and the plurality of edge strips are spliced ​​to form a plurality of forming cavities 12 for radially stressing the metal cutter head, and one forming cavity is corresponding to processing one metal cutter head, and a group of forming press heads 13 are arranged on each forming cavity, and each group of forming press heads includes a concave press head 131 and a convex press head 132, and the inner concave curvature of the concave press head is matched with the curvature of the outer periphery of the edging wheel, and is used to form the outer peripheral shape of the metal cutter head A, and the curvature of the convex press head and the outer convex curvature are matched with the curvature of the inner periphery of the edging wheel, and are used to form the inner peripheral shape of the metal cutter head A;

[0052] Specifically, the concave pressure head is first placed at the bottom of the pre-assembled forming cavity, with the inner concave part of the concave pressure head facing upward; the metal powder required for each metal cutter head is weighed and poured into the metal powder; then the convex pressure head is used to press the metal powder, with the outer convex part of the convex pressure head facing downward, as shown in FIG. Figure 6 As shown; and so on, each molding cavity in the graphite mold is equipped with a molding pressure head and metal powder; an outer mold frame 2 is put on the outside of the graphite mold, and the graphite mold is locked in the outer mold frame so that the graphite mold will not fall out, and the loading is completed.

[0053] In this embodiment, the outer diameter of the base is 150-700 mm, the cross-sectional width of the outer ring layer is 5-15 mm, the cross-sectional width of the inner ring layer is 10-20 mm, the height of the outer ring layer and the inner ring layer grinding wheel is 2-20 mm, and the metal cutter heads are distributed in a ring shape continuously or at intervals. When they are arranged at intervals, the interval range is 1-10 mm.

[0054] As a further implementation, in step (2), a plurality of shaped convex strips are convexly provided on the inner concave position of the concave pressure head to form a drainage groove on the water-grinding edge grinding wheel; the drainage groove on the water-grinding edge grinding wheel is integrally formed with the metal cutter head. The present application designs shaped convex strips on the concave pressure head to form a plurality of drainage grooves arranged at equal intervals, so that when the edge grinding wheel is in operation, cooling water can be quickly introduced directly to the outer periphery of the operating grinding surface and the inner diameter position, thereby greatly reducing the temperature of the diamond cutter head, effectively improving the wear resistance of the diamond cutter head and the edge grinding wheel, and increasing the service life of the edge grinding wheel, meeting the grinding needs of long-term continuous processing. Compared with conventional edge grinding wheels lacking a drainage groove structure, the grinding time is increased by more than 40%.

[0055] As a further implementation, in step (2), a plurality of positioning screws 21 for locking the graphite mold are provided on the periphery of the outer mold frame; a heat insulation plate 3 and an iron plate 4 are added between the 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 tightly combine the graphite mold.

[0056] As a further embodiment, in step (2), the metal abrasive includes two different powders, which are used to form a metal tool head having a double-layer structure of an outer layer and an inner layer; wherein the outer layer is a sharp layer, and the inner layer is a wear-resistant layer;

[0057] As a further implementation method, weigh the outer ring powder and inner ring powder required for each double-layer metal cutter head separately; after installing the concave pressure head, pour the outer ring powder and inner ring powder in two times in turn, and then install the convex pressure head, and the other steps remain unchanged.

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

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

[0060] During welding, a high-frequency welding machine is used for welding, the anode voltage is 8-11KV, the anode current is 1.8-2.5A, and the grid voltage is 0.5-0.8A.

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

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

[0063] Example 1

[0064] A water-grinding edge grinding wheel comprises a base body and a metal cutter head welded on the base body. In this embodiment, the outer diameter of the base body is 3000 mm, the cross-sectional width of each metal cutter head is 15 mm, and the height is 20 mm. The metal cutter heads are continuously or spaced in a ring shape. When they are spaced, the spacing range is 1 mm. The edge grinding wheel is prepared by the following steps:

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

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

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

[0068] Among them, the graphite mold used in this embodiment is as follows Figure 4-6 As shown, it specifically includes multiple pieces of vertically and horizontally arranged edge strips, and multiple edge strips are spliced ​​to form multiple forming cavities for radial force of metal cutter heads. One forming cavity corresponds to one metal cutter head. Each forming cavity is provided with a group of forming pressure heads, and each group of forming pressure heads includes a concave pressure head and a convex pressure head. The inner concave curvature of the concave pressure head is adapted to the curvature of the outer periphery of the edging wheel, and the curvature of the convex pressure head and the outer convex position is adapted to the curvature of the inner periphery of the edging wheel. Three forming convex strips 1311 are convexly arranged on the inner concave position of the concave pressure head for forming the drainage groove on the water mill edging wheel; the drainage groove on the water mill edging wheel is integrally formed with the metal cutter 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. The radial hot pressing and sintering are 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;

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

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

[0072] Example 2

[0073] A double-layer abrasive water-grinding edge grinding wheel comprises a base body B, a metal cutter head A welded to the base body, the metal cutter head comprising an outer ring layer A1 and an inner ring layer A2, and composed of two abrasives, such as Figure 2-3 As shown, in this embodiment, the outer diameter of the substrate B is 300mm, the cross-sectional width of the outer ring layer A1 of each metal cutter head is 5mm, the cross-sectional width of the inner ring layer A2 is 10mm, the height of the outer ring layer A1 and the inner ring layer A2 edge grinding wheel is 20mm, and the metal cutter heads are continuously or spaced in a ring shape. When they are spaced and distributed, the interval range is 1mm. The edge grinding wheel is prepared by the following steps:

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

[0075] In step (1), the metal blade of the water-grinding edging wheel comprises two layers of abrasives, namely, an outer ring abrasive located in an outer ring layer and an inner ring abrasive located in an inner ring layer, wherein the outer ring abrasive is prepared from the following components in parts by weight: 2.4 parts of diamond, 32 parts of copper, 6 parts of nickel, 2.5 parts of tin, 1.5 parts of rare earth elements, and 0.85 parts of paraffin wax;

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

[0077] (2) Charging: The metal abrasive includes two different powders for forming a metal cutter head having a double-layer structure of an outer ring layer and an inner ring layer; the outer ring powder and the inner ring powder required for each double-layer metal cutter head are weighed separately;

[0078] The specific assembly process is as follows: first, place the concave pressure head on the bottom of the pre-assembled molding cavity, with the inner concave part of the concave pressure head facing upward; after installing the concave pressure head, pour the outer circle powder and the inner circle powder in two times in turn, and then use the convex pressure head to press the metal powder, with the outer convex part of the convex pressure head facing downward; and so on, install the molding pressure head and pour the metal powder into each molding cavity in the graphite mold; put an outer mold frame on the outside of the graphite mold, lock the graphite mold in the outer mold frame, and set a plurality of positioning screws for locking the graphite mold on the outer periphery of the outer mold frame; add a heat insulation board and an iron plate between the outer periphery of the graphite mold and the inner wall of the outer mold frame, tighten the positioning screws on the outer mold frame, so that the graphite mold and the outer mold frame are tightly combined together, and the graphite mold will not fall out, and the loading is completed.

[0079] Among them, the graphite mold used in this embodiment is as follows Figure 4-6As shown, it specifically includes a plurality of edge strips arranged vertically and horizontally, and the plurality of edge strips are spliced ​​to form a plurality of forming cavities for radially stressing the metal cutter head. One forming cavity corresponds to one metal cutter head, and each forming cavity is provided with a group of forming pressure heads, and each group of forming pressure heads includes a concave pressure head and a convex pressure head. The curvature of the inner concave position of the concave pressure head is matched with the curvature of the outer periphery of the edging wheel, and the curvature of the outer convex position of the convex pressure head is matched with the curvature of the inner periphery of the edging wheel. Three forming convex strips 1311 for forming the drainage grooves on the water-mill edging wheel are convexly provided on the inner concave position of the concave pressure head; the drainage grooves on the water-mill edging wheel are integrally formed with the metal cutter head. The present graphite mold structure enables the molding chamber of the metal cutter head in the graphite mold to be transformed from the axial direction to the radial direction, so that the metal cutter head is radially pressurized and formed during the hot pressing process of the mold, such as Figure 6 / Figure 1 As shown in the direction 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. The radial hot pressing and sintering are 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;

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

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

[0083] Example 3

[0084] A double-layer abrasive water-grinding edge grinding wheel comprises a base B, a metal cutter head A welded on the base B, the metal cutter head comprises an outer ring layer A1 and an inner ring layer A2, and is composed of two abrasives, such as Figure 2-3 As shown, in this embodiment, the outer diameter of the substrate B is 300mm, the cross-sectional width of the outer ring layer A1 of each metal cutter head is 5mm, the cross-sectional width of the inner ring layer A2 is 10mm, the height of the outer ring layer A1 and the inner ring layer A2 edge grinding wheel is 20mm, and the metal cutter heads are continuously or spaced in a ring shape. When they are spaced and distributed, the interval range is 1mm. The edge grinding wheel is prepared by the following steps:

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

[0086] In step (1), the metal blade of the water-grinding edging wheel comprises two layers of abrasives, namely, an outer ring abrasive located in an outer ring layer and an inner ring abrasive located in an inner ring layer, wherein the outer ring abrasive is prepared from the following components in parts by weight: 1.0 part of diamond, 30 parts of copper, 3 parts of nickel, 2.0 parts of tin, 0.5 parts of rare earth elements, and 0.3 parts of paraffin wax;

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

[0088] (2) Charging: The metal abrasive includes two different powders for forming a metal cutter head having a double-layer structure of an outer ring layer and an inner ring layer; the outer ring powder and the inner ring powder required for each double-layer metal cutter head are weighed separately;

[0089] The specific assembly process is as follows: first, place the concave pressure head on the bottom of the pre-assembled molding cavity, with the inner concave part of the concave pressure head facing upward; after installing the concave pressure head, pour the outer circle powder and the inner circle powder in two times in turn, and then use the convex pressure head to press the metal powder, with the outer convex part of the convex pressure head facing downward; and so on, install the molding pressure head and pour the metal powder into each molding cavity in the graphite mold; put an outer mold frame on the outside of the graphite mold, lock the graphite mold in the outer mold frame, and set a plurality of positioning screws for locking the graphite mold on the outer periphery of the outer mold frame; add a heat insulation board and an iron plate between the outer periphery of the graphite mold and the inner wall of the outer mold frame, tighten the positioning screws on the outer mold frame, so that the graphite mold and the outer mold frame are tightly combined together, and the graphite mold will not fall out, and the loading is completed.

[0090] Among them, the graphite mold used in this embodiment is as follows Figure 4-6 As shown, it specifically includes multiple pieces of edge strips arranged vertically and horizontally, and multiple edge strips are spliced ​​to form multiple forming cavities for radial force of metal cutter heads. One forming cavity corresponds to the processing of one metal cutter head. A group of forming pressure heads are arranged on each forming cavity, and each group of forming pressure heads includes a concave pressure head and a convex pressure head. The curvature of the inner concave position of the concave pressure head is adapted to the curvature of the outer periphery of the edging wheel, and the curvature of the outer convex position of the convex pressure head is adapted to the curvature of the inner periphery of the edging wheel. Three forming convex strips 1311 for forming the drainage groove on the water-mill edging wheel are convexly arranged on the inner concave position of the concave pressure head; the drainage groove on the water-mill edging wheel is integrally formed with the metal cutter head. The graphite mold structure enables the forming chamber of the metal cutter head in the graphite mold to be transformed from the axial direction to the radial direction, so that the metal cutter head is radially pressed and formed in the mold hot pressing process.

[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. The radial hot pressing and sintering are 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;

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

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

[0094] Comparative Example 1

[0095] A water-grinding edge grinding wheel comprises a base body B and a metal cutter head A welded on the base body, wherein the metal cutter head is composed of an abrasive. In this embodiment, the outer diameter of the base body is 300 mm, the cross-sectional width of each metal cutter head is 15 mm, and the height is 20 mm. The metal cutter heads are continuously or spaced in a ring shape. When they are spaced, the spacing range is 1 mm. The edge grinding wheel is prepared by the following steps:

[0096] It is made by hot pressing and sintering method. The specific production process is as follows:

[0097] (1) Ingredients: Prepare 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: The metal powder is then poured into the pre-assembled cutter head forming mold;

[0099] (3) Axial hot pressing: placing the existing cutter head forming mold in a hot pressing device for hot pressing and sintering, the metal cutter head is axially hot pressed, and the hot pressing conditions of Example 2 are adopted;

[0100] (4) Grinding: Disassemble the cutter head forming mold and repeatedly grind the metal cutter head obtained by hot pressing and sintering to a size that meets production requirements;

[0101] (5) Welding: Finally, the metal cutter head that meets the size requirements is welded to the substrate by a high-frequency welding machine and the welding conditions of Example 2 are adopted to obtain a finished water-grinding edging wheel.

[0102] Comparative Example 2

[0103] A double-layer abrasive water-grinding edge grinding wheel, compared with Example 2, the difference of Comparative Example 2 is that in the step (3) of the preparation method, in the radial hot pressing of the cutter head, the preset process parameters are as follows: temperature is 600° C., pressure is 0.05 tons, and holding time is 5 minutes. The remaining formula and process parameters are the same as those of Example 2.

[0104] Comparative Example 3

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

[0106] Comparative Example 4

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

[0108] Comparative Example 5

[0109] A double-layer abrasive water-grinding edge grinding wheel. Compared with Example 2, the difference of Example 5 is that in the step (4) of the preparation method, the conditions for welding using a high-frequency welding machine are: the anode voltage is 12KV, the anode current is 3A, the grid voltage is 0.85A, and the remaining 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 each example grinding wheel were measured. The specific items and results are shown in Table 1.

[0112] 1. Grinding wheel consumption refers to the size and surface oxide layer of the metal cutter head obtained after hot pressing. The grinding wheel of the same manufacturer and specification of φ250 is used under the same conditions to grind each example of edge grinding wheel, and the number of edge grinding wheels that can be grinded by one grinding wheel is counted. Among them, the more the number of edge grinding wheels is, the more uneven the size of the initial products is, and the less consumables are needed.

[0113] 2. Processing cost / each edging wheel refers to the average comprehensive cost of each edging wheel processed according to the specific processing method of the present invention or the existing processing method, specifically including the sum of the costs of raw materials, electricity, consumables, etc.

[0114] 3. The service life of the edging wheel refers to the total grinding time used by the edging wheel to work until it can no longer work. The service life is calculated in hours.

[0115] Table 1 shows the performance test data of each example grinding wheel

[0116]

[0117] Compared with the existing processing technology, the edge grinding wheel preparation method of the present invention changes the pressure direction of each metal cutter head, that is, the axial force is changed into radial force. The edge grinding wheel preparation method ensures that each metal cutter head has the same horizontal height, reduces the grinding wheel consumption in the grinding / sharpening process, greatly reduces the cost, and at the same time, the service life of the edge grinding wheel is increased by more than 2 times.

[0118] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A method for preparing a water-mill edging wheel, characterized in that: The steps include: (1) Ingredients: Weigh and prepare the corresponding metal powder according to the metal blade formula of the water-grinding edging wheel; (2) Loading: The metal powder is then poured into a pre-assembled graphite mold; wherein, by improving the structure of the graphite mold, the molding chamber of the metal cutter head in the graphite mold is transformed from an axial direction to a radial direction, so that the metal cutter head is radially pressed and molded during the mold hot pressing process; (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. The radial hot pressing and sintering are 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 grinding wheel.

2. The method for preparing a water-mill edging wheel according to claim 1, characterized in that: In step (1), the metal cutter head of the water-grinding edging wheel includes two layers of abrasives, namely an outer ring abrasive located in an outer ring layer and an inner ring abrasive located in an 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 a water-mill edging wheel according to claim 2, characterized in that: The outer ring abrasive is prepared from the following components in parts by weight: 1.0-2.4 parts of diamond, 30-34 parts of copper, 3-8 parts of nickel, 2.0-3.5 parts of tin, 0.5-2.5 parts of rare earth elements, and 0.3-1.15 parts of paraffin wax; The inner ring abrasive is prepared from the following components in parts by weight: 1.0-2.4 parts of diamond, 30-34 parts of copper, 32-42 parts of iron, 3-8 parts of nickel, 8-19 parts of cobalt, 2.0-3.5 parts of tin, 0.5-2.5 parts of rare earth elements, and 0.3-1.15 parts of paraffin.

4. The method for preparing a water-mill edging wheel according to claim 1, characterized in that: In step (2), the graphite mold includes a plurality of edge strips arranged vertically and horizontally, and the plurality of edge strips are spliced ​​to form a plurality of forming cavities for radially applying force to the metal cutter head, one forming cavity corresponds to one metal cutter head, and each forming cavity is provided with a group of forming pressure heads, each group of forming pressure heads includes a concave pressure head and a convex pressure head, the inner concave curvature of the concave pressure head is adapted to the curvature of the outer periphery of the edging wheel, and the outer convex curvature of the convex pressure head is adapted to the curvature of the inner periphery of the edging wheel; Specifically, first place the concave pressure head at the bottom of the pre-assembled forming cavity, with the inner concave part of the concave pressure head facing upward; weigh the metal powder required for each metal cutter head and pour the metal powder; then press the metal powder with the convex pressure head, with the outer convex part of the convex pressure head facing downward; and so on, install the forming pressure head and metal powder in each forming cavity in the graphite mold; put an outer mold frame on the outside of the graphite mold, lock the graphite mold in the outer mold frame so that the graphite mold will not fall out, and complete the loading.

5. The method for preparing a water-mill edging wheel according to claim 4, characterized in that: In step (2), a plurality of shaped convex strips are convexly provided on the inner concave position of the concave pressure head for forming a water discharge groove on the water mill edge grinding wheel; The drain groove on the water-mill edge grinding wheel is integrally formed with the metal cutter head.

6. The method for preparing a water-mill edging wheel according to claim 4, characterized in that: In step (2), a plurality of positioning screws for locking the graphite mold are arranged on the periphery of the outer mold frame; a heat insulation plate and an iron plate are added between the 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 tightly combine the graphite mold.

7. The method for preparing a water-mill edging wheel according to claim 4, characterized in that: In step (2), the metal abrasive includes two different powders, which are used to form a metal tool head having a double-layer structure of an outer layer and an inner layer; wherein the outer layer is a sharp layer, and the inner layer is a wear-resistant layer; Specifically, weigh the outer ring powder and inner ring powder required for each double-layer metal cutter head respectively; after installing the concave pressure head, pour the outer ring powder and inner ring powder in two times in turn, and then install the convex pressure head to press, and the other steps remain unchanged.

8. The method for preparing a water-mill edging wheel according to claim 1, characterized in that: In step (3), the graphite mold is placed in the center of the workbench of the hot pressing equipment, and the graphite mold is adjusted so that the centers of the upper and lower pressure surfaces of the mold and the centers of the upper and lower pressure heads of the hot pressing equipment are on the same vertical line; the preset process parameters are as follows: temperature is 700-900°C, pressure is 0.1-0.5 tons, and insulation time is 10-20 minutes.

9. The method for preparing a water-mill edging wheel according to claim 1, characterized in that: In step (4), before welding, the removed metal cutter head is placed on a grinder to grind the oxide layer on the welding surface of the metal cutter head clean and smooth, and remove burrs on the edges and corners. During welding, a high-frequency welding machine is used for welding, the anode voltage is 8-11KV, the anode current is 1.8-2.5A, and the grid voltage is 0.5-0.8A.

10. A water-mill edging wheel, characterized in that: The water-mill edging wheel is prepared by the preparation method of the water-mill edging wheel as described in any one of claims 1 to 9.

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