A helical tooth grinding wheel processing die and a processing method

Abstract

The application relates to a helical tooth grinding wheel processing die and a processing method, wherein the helical tooth grinding wheel processing die comprises a female die, a die sleeve and a helical tooth module, the helical tooth module is installed in a slot of the die sleeve, and the die sleeve with the helical tooth module is installed in the female die; the helical tooth module comprises a plug-in block and a forming block, the plug-in block is used for vertically plugging the helical tooth module in the slot, and the forming block is obliquely arranged relative to the plug-in block; the helical tooth grinding wheel comprises a grinding wheel base body and helical teeth, the helical teeth are formed by sintering of metal powder and are connected to the grinding wheel base body; the grinding wheel base body is installed at the inner side of the helical tooth module and is clamped and fixed through a core die assembly; during sintering, the metal powder is placed between the forming block and the grinding wheel base body and is formed and connected to the side wall of the grinding wheel base body through up-down extrusion of a pressing die assembly. The application can be used for directly forming the helical tooth grinding wheel through the pressing die process, greatly improves the production efficiency of the helical tooth grinding wheel and greatly reduces the production cost.

Description

Technical Field

[0001] This application relates to the field of grinding wheel processing technology, and more specifically, to a helical gear grinding wheel processing mold and processing method. Background Technology

[0002] In the grinding of hard and brittle materials, open-tooth diamond grinding wheels are significantly superior to continuous diamond grinding wheels in terms of sharpness, cooling and chip removal, and are therefore often used for rough grinding of hard and brittle materials.

[0003] While straight-tooth grinding wheels parallel to the mounting axis are easy to process using conventional molding methods, in practical applications, the straight teeth are perpendicular to the grinding direction, often resulting in significant edge chipping when grinding hard and brittle materials, thus limiting the application of straight-tooth grinding wheels. In contrast, using helical-tooth grinding wheels forming a 0-45° angle with the grinding direction can significantly reduce edge chipping under the same grinding conditions, achieving ideal grinding results in practical applications.

[0004] Due to the limitations of the tooth profile angle, conventional molding methods cannot solve the demolding problem for helical gear grinding wheels. Therefore, the commonly used processing technology is to separately hot-press diamond tooth racks, machine the steel substrate, and then weld the diamond tooth racks one by one onto the steel substrate. This is followed by conventional grinding wheel processing steps such as turning and grinding. For the structure of spur and helical gear grinding wheels, please refer to [link to relevant documentation]. Figures 1-2 .

[0005] Compared to the processing of conventional grinding wheels, the above process significantly increases the number of steps, resulting in extremely low production efficiency. Furthermore, because helical tooth grinding wheels come in many specifications and grit sizes, a single variety cannot achieve a certain batch size, making it impossible to use automated equipment for hot pressing and welding like diamond saw blades. Therefore, in actual production, the processing cycle is longer and the production cost is higher. Summary of the Invention

[0006] The purpose of this application is to provide a mold and method for processing helical gear grinding wheels, which can directly form helical gear grinding wheels using a compression molding process and allow for easy demolding. The number of processes and processing efficiency are close to those of conventional grinding wheels, greatly improving the production efficiency of helical gear grinding wheels and significantly reducing production costs.

[0007] To achieve the above objectives, in a first aspect, the present invention provides a helical gear grinding wheel processing mold, including a female mold, a mold sleeve, and a helical gear module, wherein the helical gear module is installed in a slot of the mold sleeve, and the mold sleeve, together with the helical gear module, is installed in the female mold;

[0008] The helical tooth module includes a plug-in block and a forming block. The plug-in block is used to vertically insert the helical tooth module into the slot, and the forming block is inclined relative to the plug-in block.

[0009] The helical tooth grinding wheel includes a grinding wheel base and helical teeth, wherein the helical teeth are formed by sintering metal powder and connected to the grinding wheel base;

[0010] The grinding wheel base is installed on the inner side of the helical tooth module and clamped and fixed by the core mold assembly. During sintering, the metal powder is placed between the molding block and the grinding wheel base and is formed and connected to the side wall of the grinding wheel base by the upper and lower extrusion of the pressing mold assembly.

[0011] In an optional embodiment, the slot includes a vertical through groove disposed on the mold sleeve, the vertical through groove including an open slot located radially inward on the mold sleeve, during sintering, the outer side wall of the plug block fits against the slot wall, and the inner side wall is vertically flush with the open slot.

[0012] In an optional embodiment, the helical tooth module further includes a positioning block located between the insertion block and the forming block. The top and bottom end faces of the positioning block and the forming block are flush with each other and a gap is left between them and the top and bottom end faces of the insertion block. The positioning block and the forming block are located at the center of the insertion block in the height direction. The gap between the positioning block and the insertion block respectively forms an upper engineering step and a lower engineering step.

[0013] In an optional embodiment, the plug-in block, the positioning block, and the molding block are integrally formed. The positioning block is arranged parallel to the extension direction of the plug-in block. The molding block is vertically inclined and connected to the side wall of the positioning block. The helical tooth module is installed after the slot. The molding block and the positioning block protrude radially inward from the open slot of the slot.

[0014] In an optional embodiment, a placement groove is provided on the radially inner side of the female mold, the mold sleeve and the helical tooth module are installed in the placement groove, and an upwardly folded lower positioning ring is provided on the inner side of the placement groove, the lower positioning ring being engaged and fitted with the lower engineering step.

[0015] In an optional embodiment, the outer wall of the mold sleeve is attached to the groove surface of the placement slot, the height of the insertion block is greater than the height of the mold sleeve, and the heights of the forming block and the positioning block are the same as the height of the mold sleeve.

[0016] In an optional embodiment, a positioning mold is also included, which covers the upper part of the helical tooth module. The positioning mold has a downwardly protruding upper positioning ring on its radially inner side, and the upper positioning ring is engaged and fitted with the upper engineering step.

[0017] In an optional embodiment, the mold sleeve includes an annular structure with mold sleeve blocks evenly distributed circumferentially on its inner sidewall. Each mold sleeve block is installed along the axial direction of the mold sleeve, and its top and bottom end faces are flush with the end faces of the mold sleeve, respectively. The gap between adjacent mold sleeve blocks forms the slot.

[0018] In an optional embodiment, the core mold assembly includes an upper core mold and a lower core mold, which are disposed on the upper and lower sides of the grinding wheel base. The pressing mold assembly includes an upper pressing mold and a lower pressing mold, which move and hot-press the metal powder during sintering.

[0019] Secondly, the present invention provides a method for machining helical gear grinding wheels, comprising the following steps:

[0020] Install the helical tooth module in the corresponding slot of the mold sleeve, and install the mold sleeve together with the helical tooth module in the placement slot of the female mold;

[0021] The helical tooth module is positioned by the positioning mold, and the helical tooth module and the mold sleeve are snapped and fixed in the female mold;

[0022] The core mold assembly and the grinding wheel base are installed and combined to form a mold assembly for metal powder;

[0023] The metal powder is loaded into the furnace, the mold assembly is assembled, and the powder is then hot-pressed and sintered.

[0024] After sintering, the mold is removed, and the mold sleeve, the helical tooth module, and the sintered helical tooth grinding wheel are separated from the female mold as a whole. Then, the mold sleeve is removed in the vertical direction, and finally the helical tooth module is removed in the horizontal direction to obtain the helical tooth grinding wheel.

[0025] The helical tooth module of this invention, by setting a plug-in block and a molding block that is inclined relative to the plug-in block, can realize the molding process of the helical tooth grinding wheel and can realize the smooth demolding of the helical tooth grinding wheel.

[0026] The inclined molding blocks on the helical tooth module ensure the sintering and molding of the helical teeth, and the plug-in blocks enable the helical tooth module to move vertically relative to the mold sleeve, which facilitates the assembly and demolding of the helical tooth module and the mold sleeve.

[0027] The mold assembly, consisting of the mold sleeve and the helical tooth module, combined with the insertion block, enables the mold assembly to detach vertically from the female mold and the mold sleeve to separate from the helical tooth module. Finally, the helical tooth module detaches from the helical tooth grinding wheel radially from the inside to the outside, ensuring the integrity of the helical tooth grinding wheel.

[0028] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a spur gear grinding wheel;

[0031] Figure 2 This is a schematic diagram of the structure of a helical tooth grinding wheel;

[0032] Figure 3 This is a schematic diagram of the structure of the helical gear grinding wheel machining mold in this application;

[0033] Figure 4 This is a schematic diagram of the helical gear module in this application;

[0034] Figure 5 This is a schematic diagram of the structure of the mold in this application.

[0035] icon:

[0036] 1-Helical tooth grinding wheel; 11-Grinding wheel base; 12-Helical tooth;

[0037] 2-Female mold; 21-Placement groove; 22-Lower positioning ring;

[0038] 3-Mold sleeve; 31-Slot; 32-Mold sleeve block;

[0039] 4-Helical tooth module; 41-Plug-in block; 42-Forming block; 43-Positioning block; 44-Upper engineering step; 45-Lower engineering step;

[0040] 5-Metal powder;

[0041] 6-Positioning mold; 61-Upper positioning ring;

[0042] 7-Core mold assembly; 71-Upper core mold; 72-Lower core mold;

[0043] 8-Pressure mold assembly; 81-Upper pressure mold; 82-Lower pressure mold. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] See Figures 3-5 The helical tooth grinding wheel processing mold in this application is mainly used for the molding of helical tooth grinding wheel 1. Due to the limitations of the shape and structure of the helical teeth 12, the molding process for normal straight tooth grinding wheels cannot be applied to the processing of helical tooth grinding wheel 1. The core of this invention lies in setting up a helical tooth module 4 with a transition function structure, so that the helical tooth grinding wheel 1, which cannot be prepared by normal molding process, can be molded.

[0048] The helical gear grinding wheel processing mold in this application includes a female mold 2, a mold sleeve 3, and a helical gear module 4. The helical gear module 4 serves as a conversion structure, including the functions of forming helical gears 12 and vertically moving relative to the mold sleeve 3. It can obtain helical gears 12 by hot pressing and sintering metal powder 5 in the molding process, and at the same time, it can also make the helical gear module 4 easily demolded.

[0049] The helical tooth module 4 is installed in the slot 31 of the mold sleeve 3. During mold assembly, the mold sleeve 3, together with the helical tooth module 4, is installed in the female mold 2 to form the helical tooth 12 mold assembly of the helical tooth grinding wheel 1.

[0050] The helical tooth module 4 includes a plug-in block 41 and a forming block 42. The plug-in block 41 is used to vertically insert the helical tooth module 4 into the slot 31 of the mold sleeve 3. The forming block 42 is inclined relative to the plug-in block 41, which can form a sintering forming chamber with an inclined surface corresponding to the helical tooth 12, so that the metal powder 5 can be hot-pressed in the sintering forming chamber to obtain the helical tooth 12.

[0051] The helical gear grinding wheel 1 includes a grinding wheel base 11 and helical teeth 12. The helical teeth 12 are formed by sintering metal powder 5 and connected to the grinding wheel base 11. The grinding wheel base 11 includes a parallel wheel base. During processing, the parallel wheel base is horizontally installed on the radial inner side of the helical gear module 4 and is clamped and fixed by the core mold assembly 7. A gap is left between the horizontal wheel base and the forming block 42 of the helical gear module 4. Combined with the inclined arrangement of the forming block 42, a sintering forming chamber is formed.

[0052] During sintering, the metal powder 5 is placed in the sintering chamber between the molding block 42 and the grinding wheel base 11, and is formed by the upper and lower extrusion of the molding assembly 8. At the same time, during the hot pressing process, the metal powder 5 is connected to the side wall of the grinding wheel base 11 while being formed, thus completing the molding process of the helical tooth grinding wheel 1.

[0053] To facilitate the insertion and installation of the helical tooth module 4 into the slot 31 via the plug-in block 41, and to facilitate the separation and demolding of the helical tooth module 4 from the mold sleeve 3, the slot 31 includes a vertical through slot provided on the mold sleeve 3. Specifically, the vertical slot 31 is provided on the radial inner side of the mold sleeve 3, including an open slot located on the radial inner side of the mold sleeve 3 and opening inward. The open slot is designed so that the forming block 42 protrudes from the open slot towards the radial inner side of the mold sleeve 3, facilitating the filling of metal powder 5 between adjacent forming blocks 42.

[0054] Furthermore, during sintering, the outer wall of the plug block 41 fits against the groove wall of the slot 31, and the inner wall is vertically flush with the open slot, which allows the formed part of the helical tooth module 4 to fully protrude from the slot 31 and facilitates the fixing of the helical tooth module 4 in the mold sleeve 3.

[0055] Since the helical gear module 4 and the mold sleeve 3 are connected by a movable plug-in joint, during the assembly of the mold, it is necessary to consider positioning and fixing the helical gear module 4 through a positioning structure. Preferably, the helical gear module 4 also includes a positioning block 43 located between the plug-in block 41 and the forming block 42, which mainly realizes the positioning and snapping between the helical gear module 4 and other molds.

[0056] Specifically, the top and bottom faces of the positioning block 43 and the forming block 42 are flush with each other, that is, the top faces of the positioning block 43 and the forming block 42 are flush, and the bottom faces of the positioning block 43 and the forming block 42 are flush. Furthermore, gaps are left between the top and bottom flush faces and the top and bottom faces of the insertion block 41, respectively. These gaps form the positioning gap of the helical tooth module 4 and also provide a hot-pressing gap for the molding assembly 8. Specifically, the positioning gap is opposite to the position of the positioning block 43, and the hot-pressing gap is opposite to the position of the forming block 42.

[0057] During the mold assembly and hot pressing process, the positioning structure is engaged in the positioning gap. At the end of the hot pressing process, when the mold assembly 8 moves vertically to the top and bottom end faces of the forming block 42, the hot pressing of the metal powder 5 in the sintering forming chamber is completed.

[0058] Through the above-described structure of positioning block 43, forming block 42 and insertion block 41, the vertical hot pressing stroke required for molding can be provided for the sintering of metal powder 5, thereby meeting the structural requirements that the helical tooth grinding wheel 1 can be manufactured by molding process.

[0059] To facilitate positioning and hot pressing and ensure processing accuracy, the positioning block 43 and the forming block 42 are positioned at the center of the height direction of the insertion block 41, so that the positioning block 43 and the forming block 42, especially the forming block 42, are positioned relative to the grinding wheel base 11 in the horizontal direction.

[0060] The gaps between the positioning block 43 and the insertion block 41 respectively form the upper engineering step 44 and the lower engineering step 45 of the helical tooth module 4. Furthermore, based on the hot pressing gap and positioning gap mentioned above, the concave end face of each engineering step can be divided into the above-mentioned different regions, so that the positioning structure and the molding assembly 8 can cooperate with the helical tooth grinding wheel 1 to ensure the normal operation of the helical tooth grinding wheel 1 in the molding process.

[0061] Preferably, in one specific embodiment, in order to facilitate the processing of the helical tooth module 4 and at the same time ensure the accuracy of the shaped helical tooth 12 determined by the helical tooth module 4, the insertion block 41, the positioning block 43 and the forming block 42 are integrally formed.

[0062] From the specific structural relationship of the helical tooth module 4, the positioning block 43 and the insertion block 41 are arranged parallel to each other in the extension direction, and the forming block 42 is vertically inclined to be connected to the side wall of the positioning block 43. This allows the helical tooth module 4 to be installed in the slot 31, and the forming block 42 and the positioning block 43 to protrude radially inward from the open slot of the slot 31, so as to reliably perform positioning and hot pressing operations.

[0063] Specifically, based on the structural setup described above, the helical tooth module 4 can be processed by cutting to obtain a relatively flat engineering step surface and a beveled surface of the forming block 42 by flat cutting and bevel cutting.

[0064] The mold sleeve 3 and the helical tooth module 4 are specifically composed of the helical tooth 12 mold assembly. In order to facilitate the installation of the mold assembly, the radial inner side of the female mold 2 is provided with a placement groove 21, which is mainly used to receive and install the mold assembly.

[0065] The mold sleeve 3 and the helical tooth module 4 are installed in the placement groove 21. Specifically, the inner side of the placement groove 21 is provided with an upwardly folded lower positioning ring 22. From the angle of positioning and fixing the helical tooth module 4, the lower positioning ring 22 on the placement groove 21 is engaged and fitted with the lower engineering step 45 on the helical tooth module 4 mentioned above, which can realize the snap-fit ​​installation of the helical tooth 12 mold assembly on the female mold 2.

[0066] The outer wall of the mold sleeve 3 fits against the groove surface of the placement groove 21, enabling the mold sleeve 3 to be installed on the female mold 2. Furthermore, the height of the insertion block 41 is greater than the height of the mold sleeve 3, and the heights of the forming block 42 and the positioning block 43 are the same as the height of the mold sleeve 3. The positioning block 43 and the forming block 42 are located at the center of the insertion block 41 in the height direction, which can form annular gaps on the upper and lower sides of the mold sleeve 3. Furthermore, the annular gaps are located on the radial outer side of the insertion block 41, which facilitates the positioning and insertion of the demolding fixture into the annular gaps, making demolding operations convenient.

[0067] From the angle of the snap-fit ​​fixing of the upper part of the gear mold assembly, the helical gear grinding wheel processing mold also includes a positioning mold 6 that covers the upper part of the helical gear module 4. The radial inner side of the positioning mold 6 is provided with a downward protruding upper positioning ring 61. The upper positioning ring 61 snaps and fits with the upper engineering step 44, which can snap and fix the helical gear module 4 through the positioning mold 6.

[0068] By using the positioning mold 6 and the female mold 2 to fix the gear mold assembly by interlocking the upper and lower parts, the mold sleeve 3 can be sideways against the groove surface of the placement groove 21, thus achieving passive fixation of the mold sleeve 3.

[0069] The mold sleeve 3 in this invention includes a ring-shaped structure, with mold sleeve blocks 32 evenly distributed circumferentially on its inner sidewall. Each mold sleeve block 32 is installed along the axial direction of the mold sleeve 3, forming a vertical connection of the mold sleeve blocks 32 on the inner sidewall of the mold sleeve 3. The height of the mold sleeve blocks 32 is the same as the height of the mold sleeve 3, so that the end faces on the top and bottom sides of the mold sleeve blocks 32 are flush with the end faces of the mold sleeve 3, respectively. The gap between adjacent mold sleeve blocks 32 forms a slot 31 on the mold sleeve 3.

[0070] The slot 31 formed by the gap between adjacent mold sleeve blocks 32 can facilitate the formation of vertical through slots and open slots in the slot 31, which makes it convenient for the installation and demolding of the helical tooth module 4 on the mold sleeve 3, and makes it more convenient to process the helical tooth module 4 by molding.

[0071] At the angle of clamping and fixing the grinding wheel base 11, the core mold assembly 7 includes an upper core mold 71 and a lower core mold 72. The upper core mold 71 and the lower core mold 72 are arranged on the upper and lower sides of the grinding wheel base 11 to ensure that the grinding wheel base 11 is positioned relative to the sintering and forming chamber.

[0072] The hot pressing of the helical teeth 12 is specifically carried out through the molding assembly 8, which includes an upper molding die 81 and a lower molding die 82. Specifically, the upper molding die 81 and the lower molding die 82 are respectively positioned vertically opposite to the sintering molding chamber. During sintering, they move and hot press the metal powder 5. As the molding process proceeds, the metal powder 5, which initially has a larger thickness, gradually shrinks under hot pressing. When the bottom end face of the upper molding die 81 abuts against the concave end face of the upper engineering step 44, and the top of the lower molding die 82 abuts against the concave end face of the lower engineering step 45, the hot pressing operation is completed, which transforms the metal powder 5 into a dense sintered helical tooth 12 and connects the helical tooth 12 to the grinding wheel base 11. Figure 3 The left half of the diagram shows the metal powder 5 in its initial state, and the right half shows the metal powder 5 after molding, sintering and compression.

[0073] Whether conventional molding processes can be used to process the helical teeth 12 on the helical gear grinding wheel 1 and successfully demold them is a key and challenging aspect of this technical field. Due to the characteristics of powder metallurgy pressing, the upper and lower parts of the forming area must allow space for the movement of the metal powder 5 along the pressing direction; that is, a relatively large initial powder space must be reserved. This space must be vertically aligned to ensure pressure transmission and powder flow. However, since the forming part of the helical gear grinding wheel 1 consists of the helical teeth 12, the corresponding mold cannot move vertically. Therefore, in conventional pressure pressing and demolding methods, it is impossible to achieve pressure transmission and demolding through vertical linear movement of the mold.

[0074] The helical tooth grinding wheel processing mold of the present invention can realize the molding processing of the helical tooth grinding wheel 1 through the cooperation of the helical tooth module 4 and the mold sleeve 3. Through the ordinary molding process, the metal powder 5 is compressed and sintered in the sintering chamber by the vertical movement of the mold assembly 8, directly forming the helical tooth grinding wheel 1 and making it easy to demold. The number of processes and processing efficiency are similar to those of conventional grinding wheels, which greatly improves the production efficiency of the helical tooth grinding wheel 1 and reduces the production cost.

[0075] The starting point of the helical tooth grinding wheel processing mold in this invention is that the forming block 42 of the helical tooth module 4 has an inclined angle to ensure that the grinding wheel forms helical teeth 12. During mold assembly and demolding, the insertion block 41 corresponding to the forming block 42 can move vertically in the mold sleeve 3, which facilitates the separation of the mold sleeve 3 from the helical tooth module 4. The mold sleeve 3, which cooperates with the helical tooth module 4, forms a structure for assembly and demolding.

[0076] The helical tooth module 4 must also be able to be detached individually. After the entire grinding wheel with the helical tooth module 4 is demolded from the mold, the helical tooth module 4 can be detached from the grinding wheel radially from the inside to the outside, retaining the helical tooth grinding wheel 1 obtained by molding.

[0077] The radially detachable helical gear module 4 and the axially movable mold sleeve 3 with a stroke margin together form a helical gear 12 mold assembly with conversion function, creating conditions for the processing of the helical gear grinding wheel 1.

[0078] It should be noted that the separate conversion structure, which simultaneously possesses both radial separation and axial movement functions, can also be used as part of the grinding wheel pressing mold, allowing the helical gear grinding wheel 1 to be processed using conventional molding processes. Furthermore, the specifications of the helical gear module 4 can be adjusted according to different sizes of helical gears 12, including adjustments to the external dimensions of the helical gear module 4 and the tilt angle of the forming block 42, which will not be elaborated upon here.

[0079] The present invention also provides a method for machining helical gear grinding wheels, comprising the following steps:

[0080] Install the helical tooth module 4 in the corresponding slot 31 of the mold sleeve 3, and install the mold sleeve 3 together with the helical tooth module 4 in the placement slot 21 of the female mold 2 to complete the assembly of the helical tooth 12 mold assembly and its installation in the female mold 2.

[0081] The oblique tooth module 4 is positioned by snapping on the positioning mold 6, and the oblique tooth module 4 and the mold sleeve 3 are snapped and fixed in the female mold 2, thus completing the snapping and positioning of the oblique tooth 12 mold assembly between the positioning mold 6 and the female mold 2.

[0082] Install the core mold assembly 7 and the grinding wheel base 11 so that the grinding wheel base 11 corresponds to the horizontal position of the sintering and forming chamber, thus forming a mold assembly for the metal powder 5.

[0083] Metal powder 5 is loaded into the sintering chamber, the die assembly 8 is assembled, and the powder is hot-pressed and sintered in the furnace. The die assembly 8 is used to mold the metal powder 5.

[0084] After sintering, the helical tooth grinding wheel 1 is demolded. The mold sleeve 3, the helical tooth module 4, and the sintered helical tooth grinding wheel 1 are removed from the female mold 2 as a whole. Then, the mold sleeve 3 is removed in the vertical direction. Finally, the helical tooth module 4 is removed from the inside to the outside in the horizontal direction, that is, in the radial direction of the helical tooth grinding wheel 1, to obtain the helical tooth grinding wheel 1 after processing.

[0085] The helical tooth grinding wheel processing method in this invention greatly reduces the number of processes. It replaces the powder loading, hot pressing sintering and welding of each helical tooth with a one-time loading and hot pressing forming, which significantly improves production efficiency. The effect is even more obvious for large-size parallel wheels with a large number of teeth.

[0086] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0087] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A die for machining helical gear grinding wheels, characterized in that, It includes a female mold, a mold sleeve, and a helical tooth module, wherein the helical tooth module is installed in a slot of the mold sleeve, and the mold sleeve, together with the helical tooth module, is installed in the female mold; The helical tooth module includes a plug-in block and a forming block. The plug-in block is used to vertically insert the helical tooth module into the slot, and the forming block is inclined relative to the plug-in block. The helical tooth grinding wheel includes a grinding wheel base and helical teeth, wherein the helical teeth are formed by sintering metal powder and connected to the grinding wheel base; The grinding wheel base is installed on the inner side of the helical tooth module and clamped and fixed by the core mold assembly. During sintering, the metal powder is placed between the forming block and the grinding wheel base and formed and connected to the side wall of the grinding wheel base by the upper and lower extrusion of the pressing mold assembly. The helical tooth module also includes a positioning block located between the insertion block and the forming block. The top and bottom end faces of the positioning block and the forming block are flush with each other and there is a gap between them and the top and bottom end faces of the insertion block. The positioning block and the forming block are located at the center of the insertion block in the height direction. The gap between the positioning block and the insertion block respectively forms the upper engineering step and the lower engineering step. The plug-in block, the positioning block, and the molding block are integrally formed. The positioning block is arranged parallel to the extension direction of the plug-in block. The molding block is vertically inclined and connected to the side wall of the positioning block. The helical tooth module is installed after the slot. The molding block and the positioning block protrude radially inward from the open slot of the slot. The inner radial side of the female mold is provided with a placement groove, the mold sleeve and the helical tooth module are installed in the placement groove, and the inner side of the placement groove is provided with an upwardly folded lower positioning ring, which is engaged and fitted with the lower engineering step. It also includes a positioning mold that covers the upper part of the helical tooth module. The positioning mold has a downwardly protruding upper positioning ring on its radially inner side, and the upper positioning ring is engaged and fitted with the upper engineering step.

2. The helical gear grinding wheel processing mold according to claim 1, characterized in that, The slot includes a vertical through groove on the mold sleeve, the vertical through groove including an open slot located radially inward on the mold sleeve. During sintering, the outer wall of the plug block fits against the slot wall, and the inner wall is vertically flush with the open slot.

3. The helical gear grinding wheel processing mold according to claim 1, characterized in that, The outer wall of the mold sleeve is attached to the groove surface of the placement slot. The height of the insertion block is greater than the height of the mold sleeve. The height of the forming block and the height of the positioning block are the same as the height of the mold sleeve.

4. The helical gear grinding wheel machining mold according to any one of claims 1-3, characterized in that, The mold sleeve includes a circular structure with mold sleeve blocks evenly distributed circumferentially on its inner sidewall. Each mold sleeve block is installed along the axial direction of the mold sleeve, and its top and bottom end faces are flush with the end face of the mold sleeve, respectively. The gap between adjacent mold sleeve blocks forms the slot.

5. The helical gear grinding wheel machining mold according to any one of claims 1-3, characterized in that, The core mold assembly includes an upper core mold and a lower core mold, which are disposed on the upper and lower sides of the grinding wheel base. The pressing mold assembly includes an upper pressing mold and a lower pressing mold, which move and hot press the metal powder during sintering.

6. A method for machining helical gear grinding wheels, using the helical gear grinding wheel machining mold as described in any one of claims 1-5, characterized in that, Includes the following steps: Install the helical tooth module in the corresponding slot of the mold sleeve, and install the mold sleeve together with the helical tooth module in the placement slot of the female mold; The helical tooth module is positioned by the positioning mold, and the helical tooth module and the mold sleeve are snapped and fixed in the female mold; The core mold assembly and the grinding wheel base are installed and combined to form a mold assembly for metal powder; The metal powder is loaded into the furnace, the mold assembly is assembled, and the powder is then hot-pressed and sintered. After sintering, the mold is removed, and the mold sleeve, the helical tooth module, and the sintered helical tooth grinding wheel are separated from the female mold as a whole. Then, the mold sleeve is removed in the vertical direction, and finally the helical tooth module is removed in the horizontal direction to obtain the helical tooth grinding wheel.

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