Preparation method of grinding tool with multi-element structure

Abstract

The invention discloses a preparation method of a grinding tool with a multi-element structure, relates to the technical field of manufacturing of grinding tools with complex structures, and aims to optimize a hot-pressing process according to the number of knife structure layers of the grinding tool and gradually form the grinding tool through a multi-time hot-pressing process, the layer of knife structure with the highest required hot pressing process temperature is firstly subjected to hot pressing to form a first knife structure, then a mold is adjusted to be matched with the first knife structure formed at the previous time, and then the second layer of knife structure with the lower hot pressing temperature is subjected to hot pressing; the subsequent forming process of the third-layer cutter structure, the subsequent forming process of the fourth-layer cutter structure and the subsequent forming process of the second cutter structure are similar, a previous semi-finished product grinding tool needs to be used as a part of a mold for hot-pressing shaping fusion, and the hot-pressing temperature for forming of the cutter structures is lower. According to the method, the hot-pressing processes are sequenced according to the required hot-pressing temperature, and the knife structure with the higher hot-pressing temperature is firstly formed and then is used as one part of the mold to gradually hot-press the knife structure with the lower subsequent required hot-pressing temperature.

Description

Technical Field

[0001] The present application relates to the technical field of abrasive tool manufacturing, and in particular to a method for preparing abrasive tools with a multi-element structure. Background Art

[0002] Grinding wheels are a type of bonded abrasives that are bonded into a certain shape and have a certain strength through a binder. Conventionally, they can be divided into several types according to the type of binder: ceramic grinding wheels, resin grinding wheels and rubber grinding wheels. However, according to the needs of use, different formulas of grinding wheel bits or different types of grinding wheel bits are often required to be combined and compounded, so that the grinding wheels have the advantages of low cost, high convenience and high grinding efficiency. They are widely used in the process of removing and grinding the surfaces, corners, solder joints, burrs and rough edges of various materials.

[0003] At present, the preparation of grinding wheel products with multi-component structures usually adopts one-time feeding and one-time hot pressing. The more complex the multi-component structure is, the more unstable it is during hot pressing. Different units are mutually dissolved, and thermal expansion and contraction cause cracks, resulting in low qualification rate or even failure to form. Summary of the invention

[0004] The present application aims to solve one of the above technical problems in the prior art. To this end, the present application provides a method for preparing a grinding tool with a multi-structure.

[0005] According to an embodiment of the present application, a method for preparing a grinding tool with a multi-element structure is provided, wherein the grinding tool has at least two layers of decomposable knife structures, comprising the following steps:

[0006] Putting the raw material of the knife structure with the highest required hot pressing temperature into the first mold cavity of the mold, and hot pressing by a hot pressing head to form a first knife structure;

[0007] The structure of the mold is adjusted, and the semi-finished mold formed by the previous hot pressing is added as a part of the mold to form a second mold cavity, and the raw material of the knife structure with the highest hot pressing temperature among the remaining layers of the unformed knife structure is placed in the second mold cavity, and the raw material in the second mold cavity is hot pressed by a hot pressing head to form a second knife structure, and the first knife structure and the second knife structure are pressed together into one body;

[0008] If the blade structure of the mold has more than three layers, the forming process of the second blade structure is repeated.

[0009] The above-mentioned method for preparing a mold with a multi-structure has at least the following beneficial effects: the hot pressing process is optimized according to the number of knife structure layers of the mold, and the mold is gradually formed through multiple hot pressing processes, wherein the knife structure with the highest hot pressing temperature is first hot pressed to form the first knife structure, and then the mold is adjusted to match the first knife structure formed last time to hot press the second knife structure with a lower hot pressing temperature, and the subsequent forming process of the third knife structure, the fourth knife structure, etc. is similar to the forming process of the second knife structure, and all require the use of the previous semi-finished mold as part of the mold for hot pressing and shaping, and the hot pressing temperature of the subsequent knife structures is lower. The present application arranges the hot pressing processes according to the required hot pressing temperature, and the knife structure with a higher hot pressing temperature is formed first, and then is gradually hot pressed as part of the mold to form the knife structure with a lower hot pressing temperature. The preparation method of the mold of the present application can solve the problem of excessively large temperature difference during hot pressing of different layers of knife structures, and since the temperature of the knife structures further back is lower, it is not easy to affect the previously formed knife structures during hot pressing. The forming quality and qualified rate of the mold can be effectively improved through multiple hot pressing processes, and the forming difficulty of the mold can be reduced.

[0010] According to the method for preparing a multi-structured grinding tool described in an embodiment of the present application, the hot pressure head used for the second blade structure does not press against the first blade structure during the hot pressing process, and during the subsequent hot pressing process of multiple layers of the blade structure, the hot pressure head does not press against the previously formed semi-finished grinding tool during the hot pressing process.

[0011] According to the method for preparing a multi-structured abrasive tool described in an embodiment of the present application, the knife structure has a texture, and the texture is a herringbone pattern or a twill pattern.

[0012] According to the method for preparing a multi-structured mold described in an embodiment of the present application, the knife structure that requires secondary curing is baked after hot pressing, and the baking time is not less than 6 hours.

[0013] According to the method for preparing a multi-structured abrasive tool described in an embodiment of the present application, the abrasive tool has three layers of blade structures, the first blade structure is in the outermost layer, the second blade structure is in the middle layer, and the third blade structure is in the innermost layer.

[0014] According to the method for preparing a mold with a multi-structure described in an embodiment of the present application, the molding process of the third layer of the knife structure is: adjust the structure of the mold, add the first knife structure and the second knife structure pressed together as a part of the mold to form a third mold cavity, put the raw materials required for the third layer of the knife structure into the third mold cavity, hot press the raw materials in the third mold cavity by a hot pressing head to form a third knife structure, and the first knife structure, the second knife structure and the third knife structure are pressed together as one.

[0015] According to the method for preparing a multi-structured grinding tool described in an embodiment of the present application, the required hot pressing temperature gradually decreases from the outermost blade structure to the innermost blade structure.

[0016] According to the method for preparing a multi-structured grinding tool described in an embodiment of the present application, adjacent knife structures are made of different raw materials.

[0017] According to an embodiment of the present application, a method for preparing a grinding tool with a multi-element structure is provided, wherein the grinding tool comprises a blade structure and a coating layer, and comprises the following steps:

[0018] Putting the raw material of the knife structure into the first mold cavity of the mold, and hot pressing by a hot pressing head to form a first knife structure;

[0019] The first knife structure is subjected to baking treatment;

[0020] The structure of the mold is adjusted to form a second mold cavity, and after the first knife structure is placed in the second mold cavity, the coating layer is formed by casting.

[0021] According to the method for preparing a multi-structured grinding tool described in an embodiment of the present application, the baking time of the first knife structure is not less than 6 hours.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present application is further described below with reference to the accompanying drawings and embodiments;

[0024] Figure 1 is a schematic structural diagram of a dual-structured abrasive tool according to an embodiment of the present application;

[0025] Figure 2 The following is a schematic diagram of the preparation process of the dual-structured abrasive tool in the embodiment of the present application. Figure 1 ;

[0026] Figure 3 The following is a schematic diagram of the preparation process of the dual-structured abrasive tool in the embodiment of the present application. Figure 2 ;

[0027] Figure 4 The following is a schematic diagram of the preparation process of the dual-structured abrasive tool in the embodiment of the present application. Figure 3 ;

[0028] Figure 5 is a schematic structural diagram of a ternary structured abrasive tool in an embodiment of the present application;

[0029] Figure 6The following is a schematic diagram of the preparation process of the ternary structure abrasive tool in the embodiment of the present application. Figure 1 ;

[0030] Figure 7 The following is a schematic diagram of the preparation process of the ternary structure abrasive tool in the embodiment of the present application. Figure 2 ;

[0031] Figure 8 The following is a schematic diagram of the preparation process of the ternary structure abrasive tool in the embodiment of the present application. Figure 3

[0032] Fig. 9 The following is a schematic diagram of the preparation process of the ternary structure abrasive tool in the embodiment of the present application. Figure 4 ;

[0033] Fig.10 The following is a schematic diagram of the preparation process of the ternary structure abrasive tool in the embodiment of the present application. Figure 5 ;

[0034] Fig.11 is a schematic structural diagram of a coated abrasive tool in an embodiment of the present application;

[0035] Fig.12 The preparation process of the coated abrasive tool in the embodiment of the present application is shown in FIG. Figure 1 ;

[0036] Fig.13 The preparation process of the coated abrasive tool in the embodiment of the present application is shown in FIG. Figure 2 .

[0037] Reference numerals: first knife ring 110, first coating layer 120, third hot pressing platform 101, first molded part 102, second molded part 103, first pressed part 104, third molded part 105, fourth molded part 106, first knife ring 210, second knife ring 220, herringbone pattern 230, first hot pressing platform 201, first fixture 202, second fixture 203, first knife head 204, first herringbone pattern knife 2041, fourth fixture 205, third fixture 206 6, second blade head 207, second herringbone-shaped texture blade 2071, first blade layer 310, second blade layer 320, third blade layer 330, second hot pressing platform 301, first module 302, second module 303, first pressing head 3041, third herringbone-shaped texture blade 30411, fourth module 305, third module 306, second pressing head 3042, sixth module 307, fifth module 308, third pressing head 3043, fourth herringbone-shaped texture blade 30431. DETAILED DESCRIPTION

[0038] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0039] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0041] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0042] At present, when most grinding wheels are used for grinding, the workpiece is generally ground by contacting the cylindrical surface or end surface of the grinding wheel. The sand grains on the cylindrical surface or cross section of the grinding wheel rotate at high speed in a circle, and the sand grains pass through the surface of the workpiece, thereby grinding the workpiece. If the forming quality of the grinding wheel is not good, it is easy to accelerate the wear of the grinding wheel and reduce the service life of the grinding wheel.

[0043] The existing grinding wheels are mainly produced by mixing one or more abrasives and binders through a single pressing step during the production process. The strength of the prepared grinding wheels is relatively low. In addition, due to the different hot pressing temperatures required for different materials, various materials are fused and dissolved during hot pressing, and are prone to thermal expansion and contraction during subsequent forming, resulting in cracks. On the one hand, the product molding qualification rate is low. On the other hand, during use, the grinding wheel will be subjected to a large centrifugal force under the influence of the rotation speed. Under the action of the centrifugal force, the grinding wheel is prone to accelerated wear efficiency. At the same time, the high-speed rotating grinding wheel will be affected by the surface flatness of the workpiece and will have local fluctuations, resulting in poor grinding effect of the grinding wheel.

[0044] Reference Figures 1 to 10The present application provides a method for preparing a grinding tool with a multi-layer structure, wherein the grinding tool of the present application has at least two layers of knife structures. The method for preparing the grinding tool with a multi-layer structure comprises the following steps:

[0045] According to the required hot pressing temperature of different layers of knife structures, the processes are arranged to determine which layer of knife structure will be formed first and at which step the subsequent knife structures will be formed. Then, the required raw materials are prepared. After the process arrangement is completed, the hot pressing process of the mold can be carried out.

[0046] Among them, the required mold is first prepared, and the structure of the mold is adjusted according to the required situation of the mold, so that the mold has a first mold cavity suitable for the first layer of knife structure to be hot-pressed first, and then the raw material of the knife structure with the highest required hot-pressing temperature is placed in the first mold cavity of the mold, and the hot pressing head is heated to a preset temperature and then slowly pressed into the first mold cavity, and the raw material in the first mold cavity is hot-pressed to a certain thickness by the hot pressing head to form the first knife structure.

[0047] After the hot pressing of the first knife structure is completed, the structure of the mold is adjusted to form a second mold cavity in the mold. The second mold cavity can accommodate the semi-finished mold formed by the previous hot pressing. When hot pressing the second layer of the knife structure, the semi-finished mold formed by the previous hot pressing (if the previous hot pressing is the first hot pressing, the semi-finished mold is also the first knife structure) is added as a part of the mold to form a second mold cavity, and the raw material of the knife structure with the highest hot pressing temperature in the remaining layers of unformed knife structures is placed in the second mold cavity. After the hot pressing head is heated to a preset temperature, it is slowly pressed into the second mold cavity. The raw material in the second mold cavity is hot pressed by the hot pressing head to form a second knife structure, and the first knife structure and the second knife structure are pressed together.

[0048] Furthermore, if the knife structure of the mold has more than three layers, the forming process of the second knife structure can be repeated.

[0049] Compared with the one-time hot pressing forming in the prior art, the present application optimizes the hot pressing process according to the number of knife structure layers of the mold, and gradually forms the mold through multiple hot pressing processes, wherein the knife structure layer with the highest hot pressing process intensity is first hot pressed to form the first knife structure, and then the mold is adjusted to match the first knife structure formed last time to hot press the second knife structure with a lower hot pressing temperature. The subsequent forming processes of the third knife structure, the fourth knife structure, etc. are similar to the forming process of the second knife structure, and all require the previous semi-finished mold as part of the mold for hot pressing and shaping, and the hot pressing temperature of the subsequent knife structure is lower.

[0050] The present application arranges the hot pressing processes according to the required hot pressing temperature. The knife structure with a higher hot pressing temperature is formed first, and then the knife structure with a lower hot pressing temperature is gradually hot pressed as part of the mold.

[0051] The preparation method of the mold of the present application can solve the problem of excessively large temperature difference during hot pressing of different layers of knife structures, and since the temperature of the knife structures further back is lower, it is not easy to affect the previously formed knife structures during hot pressing. The forming quality and qualified rate of the mold can be effectively improved through multiple hot pressing processes, and the forming difficulty of the mold can be reduced.

[0052] Furthermore, the hot pressing head used for the second knife structure does not press against the first knife structure during the hot pressing process, and the hot pressing head does not press against the semi-finished mold formed by the previous hot pressing process during the subsequent hot pressing process of the multi-layer knife structure, so as to avoid damaging the semi-finished mold formed by the previous hot pressing process.

[0053] Furthermore, the knife structure has a texture, and the texture is a herringbone pattern 230 or a twill pattern.

[0054] In the embodiment shown in the present application, both the outermost blade structure of the mold and the innermost blade structure of the mold have fishbone patterns 230. When hot pressing using conventional hot pressing methods, after the powder is put into the mold cavity, a hot pressing head with fishbone patterns is used for pressing and molding. However, due to the large surface area of ​​the fishbone patterns, on the one hand, it is difficult to pull out the pressure ring during demolding, which can easily damage the blade head; on the other hand, the cooling of the mold after leaving the hot press machine and the shrinkage of the pressure ring can cause cracks in the product blade head and make it scrapped.

[0055] According to the preparation method of the present application, the outer ring is first hot pressed as shown in the knife structure, and then the inner ring is hot pressed again. Because the two hot pressing molds are designed to have different sizes, the hot pressing head of the last hot pressing does not contact the semi-finished mold formed for the first time, there is space for expansion and contraction during demolding, and there is no bidirectional extrusion force during demolding, so this method has a high pass rate.

[0056] Furthermore, the knife structure that needs secondary curing is baked after the hot pressing is completed, and the baking time is not less than 6 hours.

[0057] like Figure 1 As shown, in an embodiment of a mold shown in the present application, the mold has a two-layer knife structure and belongs to a binary structure mold. The binary structure mold includes a first knife ring 210 and a second knife ring 220. The first knife ring 210 is on the outside and the second knife ring 220 is on the inside. The hot pressing temperature of the first knife ring 210 is higher than the temperature of the second knife ring 220. Both the first knife ring 210 and the second knife ring 220 are provided with herringbone patterns 230.

[0058] When preparing the dual structure mold, prepare the relevant molds. Figure 2As shown, the mold includes a first hot pressing platform 201, a first jig 202, a second jig 203 and a first cutter head 204. The first jig 202 is ring-shaped, and the second jig 203 is located in the middle of the first hot pressing platform 201. The first jig 202, the second jig 203 and the first hot pressing platform 201 form a first mold cavity for hot pressing the first knife ring 210. The shape of the first cutter head 204 is the same as the shape of the first mold cavity, that is, the shape of the first cutter head 204 is the same as the shape of the first cutter ring 210, so that the first cutter head 204 cooperates with the first mold cavity to form the first cutter ring 210. The first cutter head 204 is provided with a first herringbone-shaped pattern knife 2041 for forming a herringbone-shaped pattern 230.

[0059] like Figure 2 As shown, after the raw materials required for the first cutter ring 210 are placed in the first mold cavity, the first cutter head 204 is heated to a preset temperature, and the first cutter head 204 is pressed into the first mold cavity and hot pressed for 1 hour to form the first cutter ring 210. After the hot pressing of the first cutter ring 210 is completed, it is baked, the baking temperature is lower than the hot pressing temperature, and the baking time is not less than 6 hours. Figure 3 It is a schematic structural diagram of the first cutting ring 210 after forming.

[0060] Adjust the structure of the mold and replace the second jig 203 with the third jig 206, so that the first mold cavity is expanded into the second mold cavity. First, place the first cutter ring 210 into the second mold cavity, and then add the fourth jig 205. The shape of the fourth jig 205 is the same as that of the first cutter ring 210, and the fourth jig 205 is placed on the first cutter ring 210, so that the third jig 206, the first cutter ring 210, the fourth jig 205 and the first hot pressing platform 201 form a groove for forming the second cutter ring 220. Replace the second cutter head 207 required for the second cutter ring 220. The second cutter head 207 is provided with a second herringbone pattern knife 2071 for forming the herringbone pattern 230.

[0061] After the raw materials required for the second cutter ring 220 are placed, the second cutter head 207 is heated to a preset temperature, and the second cutter head 207 is pressed into the groove and hot pressed for 1 hour to form the second cutter ring 220. During the hot pressing process, the second cutter head 207 does not press against the fourth fixture 205 or the first cutter ring 210, which can effectively avoid damage to the first cutter ring 210. After the hot pressing of the second cutter ring 220 is completed, it is baked, and the baking temperature is lower than the hot pressing temperature, and the baking time is not less than 6 hours. At this point, the hot pressing molding of the binary structure mold has been completed.

[0062] In some embodiments, the mold has a three-layer blade structure, the first blade structure is in the outermost layer, the second blade structure is in the middle layer, and the third blade structure is in the innermost layer. The required hot pressing temperatures are arranged from high to low as follows: the first blade structure, the second blade structure, and the third blade structure, so the hot pressing order is the first blade structure, the second blade structure, and the third blade structure.

[0063] During hot pressing, the raw materials required for hot pressing of the first knife structure are placed in the first cavity of the mold, and hot pressing is performed by a hot pressing head to form the first knife structure. The first knife structure is baked after hot pressing.

[0064] The structure of the mold is adjusted, and the first knife structure is added as a part of the mold to form a second mold cavity, the raw material of the knife structure with the highest hot pressing temperature required in the remaining layer of unformed knife structures is placed in the second mold cavity, the raw material in the second mold cavity is hot-pressed by a hot pressing head to form a second knife structure, the first knife structure and the second knife structure are pressed together, and the first knife structure and the second knife structure are baked after being pressed together.

[0065] In some embodiments, the materials used to make the adjacent blade structures are different. Of course, in some embodiments, the materials used to make the adjacent blade structures can be the same.

[0066] The forming process of the third-layer knife structure is as follows: adjust the structure of the mold, add the first knife structure and the second knife structure that are pressed together as a part of the mold to form a third mold cavity, put the raw materials required for the third-layer knife structure into the third mold cavity, hot-press the raw materials in the third mold cavity by a hot pressing head to form a third knife structure, press the first knife structure, the second knife structure and the third knife structure together, and then bake them after pressing them together.

[0067] In some embodiments, the hot pressing temperature of the first knife structure is controlled at 700°C to 800°C, the hot pressing temperature of the second knife structure is controlled at 250°C to 300°C, and the hot pressing temperature of the third knife structure is controlled at 150°C to 200°C.

[0068] like Figure 5 As shown, in an embodiment of a mold shown in the present application, the mold has a three-layer blade structure, which belongs to a ternary structure mold. The ternary structure mold includes a first blade layer 310, a second blade layer 320 and a third blade layer 330. The first blade layer 310 is on the outside, the second blade layer 320 is in the middle, and the third blade layer 330 is on the inside. The hot pressing temperature of the first blade layer 310 is higher than the temperature of the second blade layer 320, and the temperature of the second blade layer 320 is higher than the temperature of the third blade layer 330. Both the first blade layer 310 and the third blade layer 330 are provided with herringbone patterns 230.

[0069] When preparing the ternary structure mold, prepare the relevant molds. Figure 6As shown, the mold includes a second hot pressing platform 301, a first mold 302, a second mold 303 and a first pressing head 3041. The first mold 302 is ring-shaped, and the second mold 303 is located in the middle of the second hot pressing platform 301. The first mold 302, the second mold 303 and the second hot pressing platform 301 form a first mold cavity for hot pressing the first knife layer 310. The shape of the first pressing head 3041 is the same as the shape of the first mold cavity, that is, the shape of the first pressing head 3041 is the same as the shape of the first knife layer 310, so that the first pressing head 3041 cooperates with the first mold cavity to form the first knife layer 310. A third herringbone pattern knife 30411 is provided on the first pressing head 3041 for forming the herringbone pattern 230.

[0070] like Figure 6 As shown, after the raw materials required for the first blade layer 310 are placed in the first mold cavity, the first pressing head 3041 is heated to a preset temperature, which is 750°C. After the first pressing head 3041 is pressed into the first mold cavity, it is hot-pressed for 1 hour to form the first blade layer 310. After the first blade layer 310 is hot-pressed, it is baked. The baking temperature is lower than the hot-pressing temperature, and the baking time is not less than 6 hours. Figure 7 It is a schematic structural diagram of the first blade layer 310 after being formed.

[0071] like Figure 8 As shown, the structure of the mold is adjusted, and the second mold 303 is replaced by the third mold 306, so that the first mold cavity is expanded into the second mold cavity, and the first blade layer 310 is first placed in the second mold cavity, and then the fourth mold 305 is added. The shape of the fourth mold 305 is the same as the shape of the first blade layer 310, and the fourth mold 305 is placed on the first blade layer 310, so that the third mold 306, the first blade layer 310, the fourth mold 305 and the second hot pressing platform 301 form a channel for forming the second blade layer 320, and the second pressing head 3042 required for the second blade layer 320 is replaced.

[0072] After the raw materials required for the second blade layer 320 are placed, the second pressing head 3042 is heated to a preset temperature, which is 280°C. After the second pressing head 3042 is pressed into the groove, it is hot pressed for 1 hour to form the second blade layer 320. During the hot pressing process, the second pressing head 3042 does not press against the fourth module 305 or the first blade layer 310, which can effectively avoid damage to the first blade layer 310. After the hot pressing of the second blade layer 320 is completed, it is baked. The baking temperature is lower than the hot pressing temperature, which is 270°C, and the baking time is not less than 6 hours. Fig. 9 The first blade layer 310 and the second blade layer 320 are integrated into one.

[0073] like Fig.10As shown, the structure of the mold is adjusted, and the third mold 306 is replaced by the fifth mold 308, so that the second mold cavity is expanded into the third mold cavity, and the first blade layer 310 and the second blade layer 320 that are combined into one are first placed in the third mold cavity, and then the sixth mold 307 is added. The shape of the sixth mold 307 is the same as the shape of the first blade layer 310 and the second blade layer 320 that are combined into one, and the sixth mold 307 covers the first blade layer 310 and the second blade layer 320, so that the fifth mold 308, the first blade layer 310, the second blade layer 320, the sixth mold 307 and the second hot pressing platform 301 form a channel for forming the third blade layer 330, and the third pressing head 3043 required for the third blade layer 330 is replaced. The third pressing head 3043 is provided with a fourth herringbone pattern knife 30431 for forming the herringbone pattern 230.

[0074] After the raw materials required for the third blade layer 330 are placed, the third press head 3043 is heated to a preset temperature of 180°C. After the third press head 3043 is pressed into the groove, it is hot pressed for 1 hour to form the third blade layer 330. During the hot pressing process, the third press head 3043 does not press against the sixth module 307, the first blade layer 310 or the second blade layer 320, which can effectively avoid damage to the first blade layer 310 or the second blade layer 320. After the hot pressing of the third blade layer 330 is completed, it is baked. The baking temperature is lower than the hot pressing temperature, the baking temperature is 175°C, and the baking time is not less than 6 hours.

[0075] Conventional methods cannot simultaneously press and form a ternary structure mold due to the huge temperature difference in the hot pressing process. However, using the preparation method of the present application, the first blade layer 310 is first pressed at 720°C, and then the mold required for the second blade layer 320 is assembled after demolding to press the second blade layer 320. After the second blade layer 320 is pressed and demolded, it is put into an oven for curing, and then the mold required for the third blade layer 330 is assembled, and the third blade layer 330 is finally pressed, and then the oven process is performed. Because the hot pressing and baking temperatures of the second blade layer 320 are higher than those of the third blade layer 330, the preparation process of the third blade layer 330 has almost no effect on the first blade layer 310 and the first blade layer 310. In this process, the production qualification rate is high and the production is stable.

[0076] The present application also provides a method for preparing a multi-structured abrasive tool, the abrasive tool comprising a knife structure and a coating layer, wherein the coating layer covers the inner side and the outer side of the knife structure, comprising the following steps:

[0077] The raw material of the knife structure is placed in the first cavity of the mold, and hot-pressed by a hot pressing head to form a first knife structure; the first knife structure is baked; the structure of the mold is adjusted to form a second cavity, and after the first knife structure is placed in the second cavity, a coating layer is formed by casting.

[0078] In a specific embodiment, Fig.11As shown, the structure of the coated abrasive tool includes a first knife ring 110 and a first coating layer 120. The first coating layer 120 covers the first knife ring 110. The hot pressing temperature of the first knife ring 110 is higher than that of the first coating layer 120.

[0079] When preparing the coated abrasive tool, prepare the relevant mold. Fig.12 As shown, the mold includes a third hot pressing platform 101, a first mold part 102, a second mold part 103 and a first pressing part 104. The first mold part 102 is ring-shaped, and the second mold part 103 is located in the middle of the first hot pressing platform 201. The first mold part 102, the second mold part 103 and the first hot pressing platform 201 form a first mold cavity for hot pressing the first knife ring 110. The shape of the first pressing part 104 is the same as the shape of the first mold cavity, that is, the shape of the first pressing part 104 is the same as the shape of the first knife ring 110, so that the first pressing part 104 cooperates with the first mold cavity to form the first knife ring 110.

[0080] like Fig.12 As shown, after the raw materials required for the first knife ring 110 are placed in the first mold cavity, the first pressing part 104 is heated to a preset temperature, and the first pressing part 104 is pressed into the first mold cavity and hot pressed for 1 hour to form the first knife ring 110. After the hot pressing of the first knife ring 110 is completed, it is baked, the baking temperature is lower than the hot pressing temperature, and the baking time is not less than 6 hours.

[0081] Adjust the structure of the mold, replace the first mold part 102 with the third mold part 105, and replace the second mold part 103 with the fourth mold part 106, so that the first mold cavity is expanded into the second mold cavity, first place the first knife ring 110 into the second mold cavity, so that the third mold part 105, the first knife ring 110, the fourth mold part 106 and the first hot pressing platform 201 form a channel for forming the first coating layer 120, and replace the second pressing part required for the first coating layer 120.

[0082] After the raw materials required for the first coating layer 120 are heated to a molten state and poured into the channel, the second press-molded part is pressed into the channel for at least 1 hour to form the first coating layer 120. At this point, the molding of the dual-structure mold is completed.

[0083] Conventional hot pressing methods are basically unable to form the above-mentioned coated abrasive tools. Conventional hot pressing methods use inner ring hot pressing processes, which will cause the coating layer to crack due to excessively high temperatures; using the coating process will cause the inner ring cutter head to be unable to form due to low temperatures. Moreover, when feeding materials at the same time, the powder materials are not isolated directly, and it is impossible to avoid the powder materials from penetrating each other; if isolation is done, the coating layer cannot fit the cutter head tightly after hot pressing.

[0084] This application first prepares the mold for pressing, puts in the cutter head powder, the inner ring cutter head, uses 230℃, hot pressing for 60 minutes, and oven curing after demolding. Then take out the semi-finished product, put it into the corresponding mold, put in the coating layer powder for secondary hot pressing, and demolding. This method can produce products with a high pass rate.

[0085] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A method for preparing a multi-structured abrasive tool, wherein the abrasive tool has at least two layers of decomposable blade structures, characterized in that: The steps include: Putting the raw material of the knife structure with the highest required hot pressing temperature into the first mold cavity of the mold, and hot pressing by a hot pressing head to form a first knife structure; The structure of the mold is adjusted, and the semi-finished mold formed by the previous hot pressing is added as a part of the mold to form a second mold cavity, and the raw material of the knife structure with the highest hot pressing temperature among the remaining layers of the unformed knife structure is placed in the second mold cavity, and the raw material in the second mold cavity is hot pressed by a hot pressing head to form a second knife structure, and the first knife structure and the second knife structure are pressed together into one body; If the blade structure of the mold has more than three layers, the forming process of the second blade structure is repeated.

2. The method for preparing a multi-structured abrasive tool according to claim 1, characterized in that: The hot pressing head used for the second blade structure does not press against the first blade structure during hot pressing, and during subsequent hot pressing of multiple layers of the blade structure, the hot pressing head does not press against the previously formed semi-finished mold during hot pressing.

3. The method for preparing a multi-structured abrasive tool according to claim 1, characterized in that: The knife structure has a texture, and the texture is a herringbone pattern or a diagonal pattern.

4. The method for preparing a multi-structured grinding tool according to any one of claims 1 to 3, characterized in that: The knife structure that needs secondary curing is baked after hot pressing, and the baking time is not less than 6 hours.

5. The method for preparing a multi-structured abrasive tool according to claim 4, characterized in that: The abrasive tool has three layers of blade structures, wherein the first blade structure is located at the outermost layer, the second blade structure is located at the middle layer, and the third blade structure is located at the innermost layer.

6. The method for preparing a multi-structured abrasive tool according to claim 5, characterized in that: The molding process of the knife structure of the third layer is: adjust the structure of the mold, add the first knife structure and the second knife structure pressed together as part of the mold to form a third mold cavity, put the raw materials required for the knife structure of the third layer into the third mold cavity, and use a hot pressing head to hot press the raw materials in the third mold cavity to form a third knife structure. The first knife structure, the second knife structure and the third knife structure are pressed together.

7. The method for preparing a multi-structured abrasive tool according to claim 4, characterized in that: The required hot pressing temperature gradually decreases from the outermost blade structure to the innermost blade structure.

8. The method for preparing a multi-structured abrasive tool according to claim 4, characterized in that: The adjacent knife structures are made of different raw materials.

9. A method for preparing a multi-structured abrasive tool, the abrasive tool comprising a blade structure and a coating layer, the coating layer covering the inner side and the outer side of the blade structure, characterized in that: The steps include: Putting the raw material of the knife structure into the first mold cavity of the mold, and hot pressing by a hot pressing head to form a first knife structure; The first knife structure is subjected to baking treatment; The structure of the mold is adjusted to form a second mold cavity, and after the first knife structure is placed in the second mold cavity, the coating layer is formed by casting.

10. The method for preparing a multi-structured abrasive tool according to claim 9, characterized in that: The baking time of the first knife structure is not less than 6 hours.

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