Cold heading method for manufacturing groove component

Abstract

The invention discloses a cold heading method for manufacturing a groove component. The cold heading method comprises the following steps that a blank is obtained; upsetting treatment, shaping correction, positioning treatment, primary punching, secondary punching and tertiary punching are sequentially carried out on the blank through a cold heading machine and a cold heading die assembly installed in the cold heading machine, and the blank is sequentially deformed into a first middle body, a second middle body, a third middle body, a fourth middle body, a fifth middle body, a sixth middle body and a groove component. An outer inclined transition bottom surface is firstly prepared and is used as a reference surface to ensure that a uniform positioning reference exists in a subsequent processing procedure. And positioning treatment is conducted, and the position precision of the target counter bore and the inner inclined bottom face located in the target counter bore is further ensured. And through three times of punching operation, the blank flows more uniformly in the deformation process, the stress concentration phenomenon and cracks are avoided, and then it is guaranteed that the preparation process is completed smoothly.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of cold heading machining. More specifically, the present invention relates to a cold heading method for manufacturing a groove component. Background Art

[0002] Cold heading machine is a stamping machine in mechanical manufacturing, which is mainly used in the process of utilizing metal plastic forming at room temperature. It performs forming operations such as upsetting and extrusion on metal blanks through dies. Compared with preparing flat end faces, inclined surfaces are more likely to cause the direction of the blank to change and the flow speed to slow down during the flow process. Based on this, in the prior art, especially when processing countersunk holes with inner inclined bottom surfaces inside the blank, the application of cold heading machines faces challenges. The main reasons are as follows:

[0003] In order to machine an inclined surface, a matching inclined surface needs to be set at the top pressure end of the front punch. However, during the cold heading process, the angle and shape of the inclined surface are constantly changing, which causes the blank to encounter different resistances when flowing. This difference in resistance will cause the flow speed of the blank at the inclined surface and other parts to be inconsistent, resulting in uneven pressure, which will lead to local stress concentration, cracks and other problems, hindering the smooth completion of the preparation process.

[0004] In view of this, how to use a cold heading machine to prepare a groove component has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] In order to solve one or more of the above-mentioned technical problems, the present invention provides a cold heading method for manufacturing a groove component.

[0006] The present application provides a cold heading method for manufacturing a groove component, which comprises the following steps:

[0007] obtaining a blank;

[0008] The blank is subjected to upsetting treatment, shaping correction, positioning treatment, primary punching, secondary punching and tertiary punching in sequence by a cold heading machine and a cold heading die assembly loaded therein, and the blank is transformed into a first intermediate, a second intermediate, a third intermediate, a fourth intermediate, a fifth intermediate, a sixth intermediate and the groove member in sequence;

[0009] in:

[0010] The third intermediate body includes the outer inclined transition bottom surface formed on the first end thereof;

[0011] The fourth intermediate body also includes the outer inclined transition bottom surface formed on the first end thereof;

[0012] The fifth intermediate body includes the outer inclined transition bottom surface formed on the first end thereof, and a first countersunk hole formed inside thereof and extending from the second end thereof to the outer inclined transition bottom surface, wherein the first countersunk hole has a flat inner bottom surface;

[0013] The sixth intermediate body includes the outer inclined transition bottom surface formed on the first end thereof, and a second counterbore formed inside thereof and deformed from the first counterbore, wherein the second counterbore has an inner inclined transition bottom surface deformed from the flat inner bottom surface;

[0014] The groove member includes an outer inclined bottom surface formed on its first end portion and deformed from the outer inclined transition bottom surface, and a target countersunk hole formed inside thereof and deformed from the second countersunk hole, the target countersunk hole having an inner inclined bottom surface deformed from the inner inclined transition bottom surface, wherein the slope of the inner inclined bottom surface is greater than the slope of the inner inclined transition bottom surface, the slope of the outer inclined bottom surface is greater than the slope of the outer inclined transition bottom surface, and the outer inclined bottom surface is parallel to the inner inclined bottom surface.

[0015] In one embodiment, the cold heading die assembly includes a third cold heading die, the third cold heading die includes a third front punch, a third die body, and a third rear punch embedded in the third die body, and a third die cavity formed between the third die body and the third rear punch, wherein the pressing end of the third front punch has a first inclined surface, the first inclined surface is used to form the outer inclined transition bottom surface of the third intermediate body, and the pressing end of the third rear punch has a first boss;

[0016] The shaping and correction step includes: transferring the second intermediate body to the third die cavity, and cold-pressing the second intermediate body in the third die cavity by using the third front punch under the operation of the cold heading machine to obtain the third intermediate body;

[0017] The third intermediate body is pushed out of the third die cavity by the third back punch, wherein the third intermediate body further includes a fourth outer chamfer formed on its second end and obtained by punching the third outer chamfer of the second intermediate body by the first boss.

[0018] In one embodiment, the cold heading die assembly further includes a fourth cold heading die, the fourth cold heading die including a fourth front punch, a fourth die body, a fourth rear punch embedded in the fourth die body, and a fourth die cavity formed between the fourth die body and the fourth rear punch, wherein the pressing end of the fourth front punch is provided with a second boss, and the pressing end of the fourth rear punch has a second inclined surface that abuts against and retains the outer inclined transition bottom surface of the third intermediate body;

[0019] The positioning treatment step includes: transferring the pushed-out third intermediate and placing it upside down in the fourth die cavity, and cold-pressing the third intermediate in the fourth die cavity by using the fourth front punch under the operation of the cold heading machine to obtain the fourth intermediate;

[0020] The fourth intermediate body is pushed out from the fourth mold cavity by the fourth back punch,

[0021] The fourth intermediate body further includes a first positioning groove formed by the second boss on the second end of the third intermediate body and causing the fourth outer chamfer to be reduced or eliminated.

[0022] In one embodiment, the cold heading die assembly further includes a fifth cold heading die, the fifth cold heading die includes a fifth front punch, a fifth die body, a fifth rear punch embedded in the fifth die body, and a fifth die cavity formed between the fifth die body and the fifth rear punch, wherein the fifth front punch includes a first rod portion for punching the first positioning groove of the fourth intermediate body into a first countersunk hole of the fifth intermediate body, and the pressing end portion of the fifth rear punch has a third inclined surface for abutting against the outer inclined transition bottom surface of the fourth intermediate body and retaining it on the fifth intermediate body;

[0023] The step of punching once comprises: transferring the pushed-out fourth intermediate to the fifth die cavity, and cold-pressing the fourth intermediate in the fifth die cavity by using the fifth front punch under the operation of the cold heading machine to obtain the fifth intermediate;

[0024] The fifth intermediate body is pushed out from the fifth mold cavity by the fifth back punch.

[0025] In one embodiment, the cold heading die assembly further includes a sixth cold heading die, the sixth cold heading die including a sixth front punch, a sixth die body, a sixth rear punch embedded in the sixth die body, and a sixth die cavity formed between the sixth die body and the sixth rear punch, wherein the pressing end of the sixth front punch is provided with a fourth inclined surface, the fourth inclined surface is used to form the flat inner surface of the first counterbore of the fifth intermediate body into the inner inclined transition bottom surface of the second counterbore of the sixth intermediate body, the pressing end of the sixth rear punch is provided with a fifth inclined surface, the fifth inclined surface is used to abut against the outer inclined transition bottom surface of the sixth intermediate body and retain it on the sixth intermediate body;

[0026] The secondary punching step includes: transferring the pushed out fifth intermediate to the sixth die cavity, and cold pressing the fifth intermediate in the sixth die cavity by using the sixth front punch under the operation of the cold heading machine to obtain a sixth intermediate;

[0027] The sixth intermediate body is pushed out from the sixth mold cavity by the sixth back punch.

[0028] In one embodiment, the cold heading die assembly further includes a seventh cold heading die, the seventh cold heading die including a seventh front punch, a seventh die body, a seventh rear punch embedded in the seventh die body, and a seventh die cavity formed between the seventh die body and the seventh rear punch, wherein the pressing end of the seventh front punch is provided with a sixth inclined surface, the sixth inclined surface is used to form the inner inclined transition bottom surface of the second counterbore of the sixth intermediate body into the inner inclined bottom surface of the target counterbore of the groove component, the pressing end of the seventh rear punch is provided with a seventh inclined surface, the seventh inclined surface is used to form the outer inclined transition bottom surface of the sixth intermediate body into the outer inclined bottom surface of the groove component;

[0029] The three-punching step includes: transferring the ejected sixth intermediate to the seventh die cavity, cold-pressing the sixth intermediate in the seventh die cavity using the seventh front punch under the operation of the cold heading machine to obtain the groove component;

[0030] The groove member is pushed out from the seventh mold cavity by the seventh back punch.

[0031] In one embodiment, the upsetting step includes a primary upsetting and a secondary upsetting, wherein the primary upsetting obtains the first intermediate and the secondary upsetting obtains the second intermediate.

[0032] In one embodiment, the cold heading die assembly further comprises a first cold heading die, the first cold heading die comprising a first front punch, a first die body, a first rear punch embedded in the first die body, and a first die cavity formed between the first die body and the first rear punch, wherein the bottom of the cavity wall of the first die cavity has a first conical surface, and the top pressing end of the first front punch is provided with a first plane;

[0033] The steps of the primary upsetting treatment include:

[0034] The blank is transferred into the first die cavity, and the blank in the first die cavity is cold pressed by the first front punch under the operation of the cold heading machine to obtain a first intermediate;

[0035] The first intermediate body is pushed out of the first mold cavity by the first back punch, wherein the first intermediate body includes a first outer chamfer formed on its first end and formed by the first conical surface, and a first flat end surface formed on its second end and formed by the first plane.

[0036] In one embodiment, the cold heading die assembly further includes a second cold heading die, the second cold heading die including a second front punch, a second die body, a second rear punch embedded in the second die body, and a second die cavity formed between the second die body and the second rear punch, wherein the bottom of the cavity wall of the second die cavity has a second conical surface, and the top pressing end of the second front punch is provided with a second plane;

[0037] The steps of the secondary upsetting treatment include:

[0038] The first intermediate is transferred and inverted in the second die cavity, and the blank in the second die cavity is first cold pressed by the second front punch under the operation of the cold heading machine to obtain a second intermediate;

[0039] using the second back punch to push the second intermediate body out of the second mold cavity,

[0040] In which, the second intermediate body includes a second outer chamfer formed on its first end and obtained by stamping the first outer chamfer by the second plane, and a third outer chamfer formed on its second end and obtained by stamping the outer periphery of the first end plane by the second plane, the depth of the second outer chamfer is shallower than the depth of the first outer chamfer, and the slope of the second outer chamfer is greater than the slope of the first outer chamfer.

[0041] In one embodiment, the groove member further comprises the first positioning groove disposed at the second end portion thereof and surrounding the target counterbore, and the first positioning groove is coaxially disposed with the target counterbore.

[0042] By a cold heading method for manufacturing groove components as provided above, through three consecutive punching operations, a flat inner bottom surface, an inner inclined transition bottom surface and an inner inclined bottom surface are formed at the bottom of the countersunk holes arranged inside the fourth intermediate, the fifth intermediate and the sixth intermediate respectively, and the outer inclined transition bottom surface of the first end of the sixth intermediate is deformed into an outer inclined bottom surface during the three punching operations. Such a transition bottom surface design makes the flow of the blank more uniform during the deformation process, avoids stress concentration and the generation of cracks, and thus ensures the smooth completion of the preparation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0044] Figure 1 A schematic diagram of a cold heading method provided by an embodiment of the present invention;

[0045] Figure 2 A schematic flow chart of a cold heading method provided by an embodiment of the present invention;

[0046] Figure 3a is a cross-sectional view of a first intermediate of an embodiment of the present invention;

[0047] Figure 3b For preparation Figure 3a A cross-sectional view of a first cold heading die of a first intermediate body shown;

[0048] Figure 4a is a cross-sectional view of a second intermediate of an embodiment of the present invention;

[0049] Figure 4b For preparation Figure 4a A cross-sectional view of a second cold heading die of the second intermediate body shown;

[0050] Figure 5a is a cross-sectional view of a third intermediate of an embodiment of the present invention;

[0051] Figure 5b For preparation Figure 5a A cross-sectional view of a third cold heading die of the third intermediate shown;

[0052] Figure 6a is a cross-sectional view of a fourth intermediate of an embodiment of the present invention;

[0053] Figure 6b For preparation Figure 6a A cross-sectional view of a fourth cold heading die of a fourth intermediate body shown;

[0054] Figure 7a is a cross-sectional view of a fifth intermediate of an embodiment of the present invention;

[0055] Figure 7b For preparation Figure 7a A cross-sectional view of a fifth cold heading die of the fifth intermediate body shown;

[0056] Figure 8a is a cross-sectional view of a sixth intermediate of an embodiment of the present invention;

[0057] Figure 8b For preparation Figure 8a A cross-sectional view of a sixth cold heading die of the sixth intermediate shown;

[0058] Figure 9a is a cross-sectional view of a groove member according to an embodiment of the present invention;

[0059] Figure 9b For preparation Figure 9a A cross-sectional view of a seventh cold heading die of the groove member shown;

[0060] Explanation of reference numerals: 100, blank; 110, first intermediate; 111, first outer chamfer; 112, first flat end surface; 120, second intermediate; 121, second outer chamfer; 122, third outer chamfer; 130, third intermediate; 131, outer inclined transition bottom surface; 132, fourth outer chamfer; 140, fourth intermediate; 141, first positioning groove; 150, fifth intermediate; 151, first countersunk hole; 1511, flat inner bottom surface; 160, sixth intermediate; 161, second countersunk hole; 1611, inner inclined transition bottom surface 170, groove member; 171, outer inclined bottom surface; 172, target countersunk hole; 1721, inner inclined bottom surface; 200, cold heading die assembly; 210, first cold heading die; 211, first front punch; 2111, first plane; 212, first die body; 213, first rear punch; 214, first die cavity; 2141, first conical surface; 220, second cold heading die; 221, second front punch; 2211, second plane; 222, second die body; 223, second rear punch; 224, second die cavity; 22 41, second cone; 230, third cold heading die; 231, third front punch; 2311, first inclined surface; 232, third die body; 233, third rear punch; 2331, first boss; 234, third die cavity; 240, fourth cold heading die; 241, fourth front punch; 2411, second boss; 242, fourth die body; 243, fourth rear punch; 2431, second inclined surface; 244, fourth die cavity; 250, fifth cold heading die; 251, fifth front punch; 2511, first rod; 252, fifth die body; 253, the fifth rear punch; 2531, the third inclined surface; 254, the fifth cavity; 260, the sixth cold heading die; 261, the sixth front punch; 2611, the first rod portion; 262, the sixth die body; 263, the sixth rear punch; 2631, the third inclined surface; 264, the sixth cavity; 270, the seventh cold heading die; 271, the seventh front punch; 2711, the sixth inclined surface; 272, the seventh die body; 273, the seventh rear punch; 2731, the seventh inclined surface; 274, the seventh cavity; D1, the first end portion; D2, the second end portion. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0062] First, it should be noted that the groove member 170 to be prepared in the embodiment of the present application is as follows: Figure 9aAs shown, its outer bottom surface (i.e., the first end D1) is an outer inclined bottom surface 171, and a target countersunk hole 172 with an opening facing upward (i.e., toward the second end D2) is provided inside, and the bottom of the target countersunk hole 172 is an inner inclined bottom surface 1721, and the inner inclined bottom surface 1721 is arranged parallel to the outer inclined bottom surface 171. In particular, during the preparation of the inner inclined bottom surface 1721, due to the continuous changes in the angle and shape of the inclined surface, the blank will be subject to different resistances during flow, and the difference in resistance will cause the flow speed of the blank at the inclined surface and other parts to be inconsistent, thereby generating uneven pressure, which will lead to local stress concentration, cracks and other problems, hindering the smooth completion of the preparation process.

[0063] In order to solve the technical problems existing in preparing the aforementioned groove member 170, as Figure 1 and Figure 2 As shown, the embodiment of the present application provides a cold upsetting method for manufacturing a groove component, firstly, a blank 100 needs to be obtained, and then S100 is executed to perform an upsetting process on the blank 100 to sequentially obtain a first intermediate 110 and a second intermediate 120. For the specific upsetting method of the obtained first intermediate 110 and the second intermediate 120, those skilled in the art can design it with reference to the prior art, and it is not limited here.

[0064] Then, S200 is executed: the second intermediate body 120 is shaped and corrected to obtain the third intermediate body 130. Figure 5a As shown, the third intermediate body 130 includes an outer inclined transition bottom surface 131 formed on the first end portion D1 thereof.

[0065] After executing S200, executing S300: performing positioning processing on the third intermediate 130 to obtain the fourth intermediate 140. Figure 6a As shown, the fourth intermediate body 140 also includes an outer inclined transition bottom surface 131 formed on the first end portion D1 thereof.

[0066] After executing S300, executing S400: punching the fourth intermediate 140 once to obtain the fifth intermediate 150. Figure 7a As shown, the fifth intermediate body 150 includes an outer inclined transition bottom surface 131 formed on a first end thereof, and a first counterbore 151 formed inside thereof and extending from a second end D2 to the outer inclined transition bottom surface 131 , wherein the first counterbore 151 has a flat inner bottom surface 1511 .

[0067] After executing S400, executing S500: performing secondary punching on the fifth intermediate 150 to obtain the sixth intermediate 160. Figure 7a and Figure 8aAs shown, the sixth intermediate body 160 includes an outer inclined transition bottom surface 131 formed on a first end thereof, and a second counterbore 161 formed therein and deformed from the first counterbore 151 , the second counterbore 161 having an inner inclined transition bottom surface 1611 deformed from the flat inner bottom surface 1511 .

[0068] After executing S500, executing S600: punching the sixth intermediate 160 three times to obtain the groove member 170. Figure 8a and Figure 9a As shown, the groove member 170 includes an outer inclined bottom surface 171 formed on the first end thereof and deformed from the outer inclined transition bottom surface 131, and a target countersunk hole 172 formed inside thereof and deformed from the second countersunk hole 161, the target countersunk hole 172 has an inner inclined bottom surface 1721 deformed from the inner inclined transition bottom surface 1611, wherein the slope of the inner inclined bottom surface 1721 is greater than the slope of the inner inclined transition bottom surface 1611, the slope of the outer inclined bottom surface 171 is greater than the slope of the outer inclined transition bottom surface 131, and the outer inclined bottom surface 171 is parallel to the inner inclined bottom surface 1721.

[0069] In summary, in order to prepare the groove component 170, the blank 100 needs to be subjected to upsetting treatment, shaping correction, positioning treatment, primary punching, secondary punching and tertiary punching in sequence, and the blank 100 is transformed into the first intermediate 110, the second intermediate 120, the third intermediate 130, the fourth intermediate 140, the fifth intermediate 150 and the sixth intermediate 160 in sequence, and finally the aforementioned groove component 170 is formed. The three-punching operation forms a flat inner bottom surface 1511, an inner inclined transition bottom surface 1611 and an inner inclined bottom surface 1721 at the bottom of the countersunk hole located inside the fourth intermediate 140, the fifth intermediate 150 and the sixth intermediate 160 in sequence, and the outer inclined transition bottom surface 131 of the first end of the sixth intermediate 160 is deformed into an outer inclined bottom surface 171 during the three-punching operation. Such a transition bottom surface design makes the flow of the blank more uniform during the deformation process, avoids stress concentration and the generation of cracks, and thus ensures the smooth completion of the preparation process.

[0070] Based on the above-mentioned embodiments, the cold heading die assembly involved in each step is described below.

[0071] In some embodiments, the aforementioned S100 upsetting process includes a primary upsetting process and a secondary upsetting process.

[0072] Specific, combined Figure 3a as well as Figure 4a The first upsetting treatment is used to prepare the first intermediate 110, and the second upsetting treatment is used to prepare the second intermediate 120.

[0073] When the first intermediate 110 is prepared by a first upsetting process, a first cold upsetting die 210 is required. Figure 3b As shown, the first cold heading die 210 includes a first front punch 211 , a first die body 212 , a first back punch 213 embedded in the first die body 212 , and a first die cavity 214 formed between the first die body 212 and the first back punch 213 .

[0074] Furthermore, the bottom of the cavity wall of the first cavity 214 has a first conical surface 2141, and the pressing end of the first front punch 211 is provided with a first plane 2111. In an upsetting process, first, the cold heading machine transfers the blank 100 to the first cavity 214, and uses the first front punch 211 to cold press the blank 100 in the first cavity 214 to obtain a first intermediate body 110; the first rear punch 213 is used to push the first intermediate body 110 out of the first cavity 214, wherein the first intermediate body 110 includes a first outer chamfer 111 formed on its first end D1 and formed by the first conical surface 2141, and a first flat end surface 112 formed on its second end D2 and formed by the first plane 2111. Specifically, in combination with Figure 2 a and Figure 3b As shown, the first end D1 of the blank 100 is first placed downward into the first die cavity 214, and then the first front punch 211 is driven to move downward, and the first plane 2111 arranged at the bottom of the first front punch 211 punches the second end D2 of the blank 100, and at the same time, the first conical surface 2141 punches the first end D1 of the blank 100, so that the blank 100 located in the first die cavity 214 is squeezed and deformed, forming the aforementioned first intermediate 110. Finally, the first rear punch 213 is driven to move upward to push the aforementioned first intermediate 110 out of the first die cavity 214. When preparing the second intermediate 120 through the secondary upsetting treatment, a second cold upsetting die 220 is required. As shown Figure 4b As shown, the second cold heading die 220 includes a second front punch 221, a second die body 222, a second rear punch 223 embedded in the second die body 222, and a second die cavity 224 formed between the second die body 222 and the second rear punch 223, wherein the bottom of the cavity wall of the second die cavity 224 has a second conical surface 2241, and the top pressing end of the second front punch 221 is provided with a second plane 2211.

[0075] The steps of the secondary upsetting treatment include: transferring the first intermediate 110 and inverting it in the second die cavity 224, using the second front punch 221 to cold-press the blank 100 in the second die cavity 224 under the operation of the cold heading machine to obtain the second intermediate 120, and using the second rear punch 223 to push the second intermediate 120 out of the second die cavity 224, wherein the second intermediate 120 includes a second outer chamfer 121 formed on its first end D1 and obtained by punching the first outer chamfer 111 by the second plane 2211, and a third outer chamfer 122 formed on its second end D2 and obtained by punching the outer periphery of the first end plane 112 by the second plane 2211, the depth of the second outer chamfer 121 is shallower than the depth of the first outer chamfer 111, and the slope of the second outer chamfer 121 is greater than the slope of the first outer chamfer 111. Specifically, combined with Figure 3a and Figure 4b As shown, first, the second end D2 of the first intermediate body 110 is placed downward into the second die cavity 224, and then the second front punch 221 is driven to move downward, and the second plane 2211 set at the bottom of the second front punch 221 punches the first outer chamfer 111 located at the first end D1 of the first intermediate body 110, so that the first outer chamfer 111 is deformed into a second outer chamfer 121 with a shallower depth, and at the same time, the second conical surface 2241 punches the first end plane 112 located at the second end D2 of the first intermediate body 110, so that the first end plane 112 is deformed into a third outer chamfer 122. The first intermediate body 110 is squeezed and deformed in the second die cavity 224, thereby forming the aforementioned second intermediate body 120. Finally, the second rear punch 223 is driven to move upward to push the aforementioned second intermediate body 120 out of the second die cavity 224.

[0076] By performing the above-mentioned upsetting treatment on the blank 100, a third intermediate 130 having an outer inclined transition bottom surface 131 is obtained, and the inclined transition bottom surface 131 is used as a reference surface to ensure a unified positioning reference in subsequent processing steps, thereby avoiding cumulative errors caused by frequent replacement of reference surfaces between different processes. In addition, the two upsetting treatments can remove burrs at both ends of the blank 100 and improve the flatness of the blank.

[0077] In some embodiments, the shaping correction in the aforementioned S200 requires the use of a third cold heading die 230. Figure 5b As shown, the third cold heading die 230 includes a third front punch 231, a third die body 232 and a third rear punch 233 embedded in the third die body 232, and a third die cavity 234 formed between the third die body 232 and the third rear punch 233, wherein the pressing end of the third front punch 231 has a first inclined surface 2311, and the first inclined surface 2311 is used to form the outer inclined transition bottom surface 131 of the third intermediate body 130, and the pressing end of the third rear punch 233 has a first boss 2331.

[0078] The shaping and correction steps include: transferring the second intermediate body 120 into the third die cavity 234, cold-pressing the second intermediate body 120 in the third die cavity 234 using the third front punch 231 under the operation of the cold heading machine to obtain the third intermediate body 130, and pushing the third intermediate body 130 out of the third die cavity 234 using the third rear punch 232, wherein the third intermediate body 130 also includes a fourth outer chamfer 132 formed on the second end D2 thereof and obtained by punching the third outer chamfer 122 of the second intermediate body 120 by the first boss 2331. Specifically, in combination with Figure 4a and Figure 5b As shown, first, the second end D2 of the second intermediate body 120 is placed downward into the third die cavity 234, and then the third front punch 231 is driven to move downward, and the first inclined surface 2311 arranged at the bottom of the third front punch 231 punches the second outer chamfer 121 located at the first end D1 of the second intermediate body 120, so that the second outer chamfer 121 is deformed into an outer inclined transition bottom surface 131, and at the same time, the first boss 2331 punches the third outer chamfer 122 located at the second end D2 of the second intermediate body 120, so that the third outer chamfer 122 is deformed into a fourth outer chamfer 132. The second intermediate body 120 is squeezed and deformed in the third die cavity 234, thereby forming the aforementioned third intermediate body 130. Finally, the third rear punch 232 is driven to move upward to push the aforementioned third intermediate body 130 out of the third die cavity 234. In some embodiments, the positioning process in the aforementioned S300 requires the use of the fourth cold heading die 240. As shown Figure 6b As shown, the fourth cold heading die 240 includes a fourth front punch 241, a fourth die body 242, a fourth rear punch 243 embedded in the fourth die body 242, and a fourth die cavity 244 formed between the fourth die body 242 and the fourth rear punch 243, wherein the pressing end of the fourth front punch 241 is provided with a second boss 2411, and the pressing end of the fourth rear punch 243 has a second inclined surface 2431 that abuts against and retains the outer inclined transition bottom surface 131 of the third intermediate body 130.

[0079] The steps of positioning treatment include: transferring and inverting the pushed-out third intermediate 130 into the fourth die cavity 244, cold-pressing the third intermediate 130 in the fourth die cavity 244 using the fourth front punch 241 under the operation of the cold heading machine to obtain the fourth intermediate 140, and pushing the fourth intermediate 140 out of the fourth die cavity 244 using the fourth rear punch 243, wherein the fourth intermediate 140 further includes a first positioning groove 141 formed by the second boss 2411 on the second end D2 of the third intermediate 130 and causing the fourth outer chamfer 132 to be reduced or eliminated. Specifically, in combination with Figure 5a and Figure 6bAs shown, first, the first end D1 of the third intermediate body 130 is placed downward into the fourth die cavity 244, and then the fourth front punch 241 is driven to move downward, and the second boss 2411 arranged at the bottom of the fourth front punch 241 punches the fourth outer chamfer 132 located at the second end D2 of the third intermediate body 130, so as to cause the fourth outer chamfer 132 to be deformed into the first positioning groove 141, and at the same time, the second inclined surface 2431 arranged at the top of the fourth rear punch 243 is pressed against the outer inclined transition bottom surface 131 located at the first end D1 of the third intermediate body 130, so as to retain the outer inclined transition bottom surface 131. The third intermediate body 130 is squeezed and deformed in the fourth die cavity 244, thereby forming the aforementioned fourth intermediate body 140. Finally, the fourth rear punch 243 is driven to move upward, and the aforementioned fourth intermediate body 140 is pushed out of the fourth die cavity 244.

[0080] The first positioning groove 141 formed by the positioning process in S300 will always exist, and it has the function of positioning and guiding, and can enable the front punch to quickly position the front punch to the end of the blank for punching operation, which helps to improve the processing efficiency. Figure 9a As shown, the finally obtained groove component 170 includes a first positioning groove 141 arranged at its second end D2 and surrounding the target countersunk hole 172, which is coaxially arranged with the target countersunk hole 172. Such positioning treatment will further ensure the position accuracy of the target countersunk hole 172 formed inside the groove component 170 and the inner inclined bottom surface 1721 located inside the target countersunk hole 172, and at the same time can also ensure that the subsequent three punchings are performed at the same reference position, making the processing process smoother.

[0081] In some embodiments, the punching in S400 requires the use of the fifth cold heading die 250. Figure 7b As shown, the fifth cold heading die 250 includes a fifth front punch 251, a fifth die body 252, a fifth rear punch 253 embedded in the fifth die body 252, and a fifth die cavity 254 formed between the fifth die body 252 and the fifth rear punch 253, wherein the fifth front punch 251 includes a first rod portion 2511 for punching the first positioning groove 141 of the fourth intermediate body 140 into a first counterbore 151 of the fifth intermediate body 150, and the top pressing end of the fifth rear punch 253 has a third inclined surface 2531 for abutting against the outer inclined transition bottom surface 131 of the fourth intermediate body 140 and retaining it on the fifth intermediate body 150;

[0082] The first punching step includes: transferring the pushed-out fourth intermediate 140 to the fifth die cavity 254, cold-pressing the fourth intermediate 140 in the fifth die cavity 254 using the fifth front punch 251 under the operation of the cold heading machine to obtain the fifth intermediate 150, and pushing the fifth intermediate 150 out of the fifth die cavity 254 using the fifth rear punch 253. Figure 6a and Figure 7b As shown, first, the first end D1 of the fourth intermediate body 140 is placed downward into the fifth die cavity 254, and then the fifth front punch 251 is driven to move downward, and the first rod portion 2511 arranged at the bottom of the fifth front punch 251 punches the first positioning groove 141 located at the second end D2 of the fourth intermediate body 140. As the first rod portion 2511 continues to move downward, a first countersunk hole 151 with a flat inner surface 1511 is formed, and at the same time, the top of the fifth rear punch 253 is pressed against the outer inclined transition bottom surface 131 located at the first end D1 of the fourth intermediate body 140. The fourth intermediate body 140 is squeezed and deformed in the fifth die cavity 254, thereby forming the aforementioned fifth intermediate body 150. Finally, the fifth rear punch 253 is driven to move upward to push the aforementioned fifth intermediate body 150 out of the fifth die cavity 254.

[0083] In some embodiments, the secondary punching in S500 requires the use of the sixth cold heading die 260. Figure 8b As shown, the sixth cold heading die 260 includes a sixth front punch 261, a sixth die body 262, a sixth rear punch 263 embedded in the sixth die body 262, and a sixth die cavity 264 formed between the sixth die body 262 and the sixth rear punch 263, wherein the pressing end of the sixth front punch 261 is provided with a fourth inclined surface 2611, and the fourth inclined surface 2611 is used to shape the flat inner surface 1511 of the first countersunk hole 151 of the fifth intermediate body 150 into the inner inclined transition bottom surface 1611 of the second countersunk hole 161 of the sixth intermediate body 160, and the pressing end of the sixth rear punch 263 is provided with a fifth inclined surface 2631, and the fifth inclined surface 2631 is used to abut against the outer inclined transition bottom surface 131 of the sixth intermediate body 160 and retain it on the sixth intermediate body 160.

[0084] The secondary punching step includes: transferring the pushed out fifth intermediate 150 to the sixth die cavity 264, cold pressing the fifth intermediate 150 in the sixth die cavity 264 with the sixth front punch 261 under the operation of the cold heading machine to obtain the sixth intermediate 160, and pushing the sixth intermediate 160 out of the sixth die cavity 264 with the sixth rear punch 263. Figure 7a and Figure 8bAs shown, first, the first end D1 of the fifth intermediate body 150 is placed downward into the sixth die cavity 264, and then the sixth front punch 261 is driven to move downward, and the fourth inclined surface 2611 set at the bottom of the sixth front punch 261 punches the flat inner surface 1511 located in the fifth intermediate body 150, so that the flat inner surface 1511 is deformed into an inner inclined transition bottom surface 1611, and at the same time, the top of the sixth rear punch 263 is pressed against the outer inclined transition bottom surface 131 located at the first end D1 of the fifth intermediate body 150. The fifth intermediate body 150 is squeezed and deformed in the sixth die cavity 264, and then the aforementioned sixth intermediate body 160 is formed. Finally, the sixth rear punch 263 is driven to move upward to remove the aforementioned formed sixth intermediate body 160 from the sixth die cavity 264.

[0085] In some embodiments, the three punching operations in S600 require the seventh cold heading die 270. Figure 9b As shown, the seventh cold heading die 270 includes a seventh front punch 271, a seventh mold body 272, a seventh rear punch 273 embedded in the seventh mold body 272, and a seventh mold cavity 274 formed between the seventh mold body 272 and the seventh rear punch 273, wherein the pressing end of the seventh front punch 271 is provided with a sixth inclined surface 2711, and the sixth inclined surface 2711 is used to form the inner inclined transition bottom surface 1611 of the second counterbore 161 of the sixth intermediate body 160 into the inner inclined bottom surface 1721 of the target counterbore 172 of the groove component 170, and the pressing end of the seventh rear punch 273 is provided with a seventh inclined surface 2731, and the seventh inclined surface 2731 is used to form the outer inclined transition bottom surface 131 of the sixth intermediate body 160 into the outer inclined bottom surface 171 of the groove component 170.

[0086] The three-punching steps include: transferring the ejected sixth intermediate 160 into the seventh die cavity 274, cold-pressing the sixth intermediate 160 in the seventh die cavity 274 using the seventh front punch 271 under the operation of the cold heading machine to obtain the groove component 170, and ejecting the groove component 170 from the seventh die cavity 274 using the seventh rear punch 273. Figure 8a and Figure 9bAs shown, first, the first end D1 of the sixth intermediate 160 is placed downward into the seventh mold cavity 274, and then the seventh front punch 271 is driven to move downward, and the sixth inclined surface 2711 located at the bottom of the seventh front punch 271 punches the inner inclined transition bottom surface 1611 located inside the sixth intermediate 160, so that the inner inclined transition bottom surface 1611 is deformed into the inner inclined bottom surface 1721, and at the same time, the seventh inclined surface 2731 located at the top of the seventh rear punch 273 punches the outer inclined transition bottom surface 131, so that the outer inclined transition bottom surface 131 is deformed into the outer inclined bottom surface 171. The sixth intermediate 160 is squeezed and deformed in the seventh mold cavity 274, and then the aforementioned groove component 170 is formed. Finally, the seventh rear punch 273 is driven to move upward, and the groove component 170 is pushed out of the seventh mold cavity 274 to complete the preparation.

[0087] In the above description of the present application, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" and the like should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in the present application, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0088] According to the above description of the present application, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate orientation or position relationship, are based on the orientation or position relationship shown in the drawings of the present application, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0089] In addition, the terms "first" or "second" used in this application to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0090] Although multiple embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may conceive of many changes, modifications, and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The appended claims are intended to define the scope of protection of the present invention, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A cold heading method for manufacturing a grooved component, characterized in that: It includes the following steps: obtaining a blank; The blank is subjected to upsetting treatment, shaping correction, positioning treatment, primary punching, secondary punching and tertiary punching in sequence by a cold heading machine and a cold heading die assembly loaded therein, and the blank is transformed into a first intermediate, a second intermediate, a third intermediate, a fourth intermediate, a fifth intermediate, a sixth intermediate and the groove member in sequence; in: The third intermediate body includes an outer inclined transition bottom surface formed on a first end thereof; The fourth intermediate body also includes the outer inclined transition bottom surface formed on the first end thereof; The fifth intermediate body includes the outer inclined transition bottom surface formed on the first end thereof, and a first countersunk hole formed inside thereof and extending from the second end thereof to the outer inclined transition bottom surface, wherein the first countersunk hole has a flat inner bottom surface; The sixth intermediate body includes the outer inclined transition bottom surface formed on the first end thereof, and a second counterbore formed inside thereof and deformed from the first counterbore, wherein the second counterbore has an inner inclined transition bottom surface deformed from the flat inner bottom surface; The groove member includes an outer inclined bottom surface formed on its first end portion and deformed from the outer inclined transition bottom surface, and a target countersunk hole formed inside thereof and deformed from the second countersunk hole, the target countersunk hole having an inner inclined bottom surface deformed from the inner inclined transition bottom surface, wherein the slope of the inner inclined bottom surface is greater than the slope of the inner inclined transition bottom surface, the slope of the outer inclined bottom surface is greater than the slope of the outer inclined transition bottom surface, and the outer inclined bottom surface is parallel to the inner inclined bottom surface.

2. The cold heading method according to claim 1, characterized in that: The cold heading die assembly comprises a third cold heading die, the third cold heading die comprises a third front punch, a third die body, a third rear punch embedded in the third die body, and a third die cavity formed between the third die body and the third rear punch, wherein the pressing end of the third front punch has a first inclined surface, the first inclined surface is used to form the outer inclined transition bottom surface of the third intermediate body, and the pressing end of the third rear punch has a first boss; The steps of plastic surgery correction include: The second intermediate is transferred into the third die cavity, and the second intermediate in the third die cavity is cold pressed by the third front punch under the operation of the cold heading machine to obtain the third intermediate; Using the third back punch to push the third intermediate out of the third mold cavity; The third intermediate body further includes a fourth outer chamfer formed on the second end portion thereof and obtained by punching the third outer chamfer of the second intermediate body by the first boss.

3. The cold heading method according to claim 2, characterized in that: The cold heading die assembly also includes a fourth cold heading die, the fourth cold heading die includes a fourth front punch, a fourth die body, a fourth rear punch embedded in the fourth die body, and a fourth die cavity formed between the fourth die body and the fourth rear punch, wherein the pressing end of the fourth front punch is provided with a second boss, and the pressing end of the fourth rear punch has a second inclined surface that abuts against and retains the outer inclined transition bottom surface of the third intermediate body; The positioning treatment step includes: transferring the pushed-out third intermediate and placing it upside down in the fourth die cavity, and cold-pressing the third intermediate in the fourth die cavity by using the fourth front punch under the operation of the cold heading machine to obtain the fourth intermediate; The fourth intermediate body is pushed out from the fourth mold cavity by the fourth back punch, The fourth intermediate body further includes a first positioning groove formed by the second boss on the second end of the third intermediate body and causing the fourth outer chamfer to be reduced or eliminated.

4. The cold heading method according to claim 3, characterized in that: The cold heading die assembly also includes a fifth cold heading die, the fifth cold heading die includes a fifth front punch, a fifth die body, a fifth rear punch embedded in the fifth die body, and a fifth die cavity formed between the fifth die body and the fifth rear punch, wherein the fifth front punch includes a first rod portion for punching the first positioning groove of the fourth intermediate body into a first countersunk hole of the fifth intermediate body, and the pressing end of the fifth rear punch has a third inclined surface for abutting against the outer inclined transition bottom surface of the fourth intermediate body and retaining it on the fifth intermediate body; The step of punching once comprises: transferring the pushed-out fourth intermediate to the fifth die cavity, and cold-pressing the fourth intermediate in the fifth die cavity by using the fifth front punch under the operation of the cold heading machine to obtain the fifth intermediate; The fifth intermediate body is pushed out from the fifth mold cavity by the fifth back punch.

5. The cold heading method according to claim 4, characterized in that: The cold heading die assembly also includes a sixth cold heading die, the sixth cold heading die includes a sixth front punch, a sixth die body, a sixth rear punch embedded in the sixth die body, and a sixth die cavity formed between the sixth die body and the sixth rear punch, wherein the pressing end of the sixth front punch is provided with a fourth inclined surface, the fourth inclined surface is used to form the flat inner surface of the first counterbore of the fifth intermediate body into the inner inclined transition bottom surface of the second counterbore of the sixth intermediate body, the pressing end of the sixth rear punch is provided with a fifth inclined surface, the fifth inclined surface is used to abut against the outer inclined transition bottom surface of the sixth intermediate body and retain it on the sixth intermediate body; The secondary punching step includes: transferring the pushed out fifth intermediate to the sixth die cavity, and cold pressing the fifth intermediate in the sixth die cavity by using the sixth front punch under the operation of the cold heading machine to obtain a sixth intermediate; The sixth intermediate body is pushed out from the sixth mold cavity by the sixth back punch.

6. The cold heading method according to claim 5, characterized in that: The cold heading die assembly also includes a seventh cold heading die, the seventh cold heading die includes a seventh front punch, a seventh die body, a seventh rear punch embedded in the seventh die body, and a seventh die cavity formed between the seventh die body and the seventh rear punch, wherein the pressing end of the seventh front punch is provided with a sixth inclined surface, the sixth inclined surface is used to form the inner inclined transition bottom surface of the second counterbore of the sixth intermediate body into the inner inclined bottom surface of the target counterbore of the groove component, and the pressing end of the seventh rear punch is provided with a seventh inclined surface, the seventh inclined surface is used to form the outer inclined transition bottom surface of the sixth intermediate body into the outer inclined bottom surface of the groove component; The three-punching step includes: transferring the ejected sixth intermediate to the seventh die cavity, cold-pressing the sixth intermediate in the seventh die cavity using the seventh front punch under the operation of the cold heading machine to obtain the groove component; The groove member is pushed out from the seventh mold cavity by the seventh back punch.

7. The cold heading method according to any one of claims 1 to 6, characterized in that: The upsetting step includes a primary upsetting and a secondary upsetting, wherein the primary upsetting obtains the first intermediate and the secondary upsetting obtains the second intermediate.

8. The cold heading method according to claim 7, characterized in that: The cold heading die assembly further comprises a first cold heading die, the first cold heading die comprising a first front punch, a first die body, a first rear punch embedded in the first die body, and a first die cavity formed between the first die body and the first rear punch, wherein the bottom of the cavity wall of the first die cavity has a first conical surface, and the top pressing end of the first front punch is provided with a first plane; The steps of the primary upsetting treatment include: The blank is transferred into the first die cavity, and the blank in the first die cavity is cold pressed by the first front punch under the operation of the cold heading machine to obtain a first intermediate; The first intermediate body is pushed out of the first mold cavity by the first back punch, wherein the first intermediate body includes a first outer chamfer formed on its first end and formed by the first conical surface, and a first flat end surface formed on its second end and formed by the first plane.

9. The cold heading method according to claim 8, characterized in that: The cold heading die assembly further includes a second cold heading die, the second cold heading die including a second front punch, a second die body, a second rear punch embedded in the second die body, and a second die cavity formed between the second die body and the second rear punch, wherein the bottom of the cavity wall of the second die cavity has a second conical surface, and the top pressing end of the second front punch is provided with a second plane; The steps of the secondary upsetting treatment include: The first intermediate is transferred and inverted in the second die cavity, and the blank in the second die cavity is first cold pressed by the second front punch under the operation of the cold heading machine to obtain a second intermediate; using the second back punch to push the second intermediate body out of the second mold cavity, In which, the second intermediate body includes a second outer chamfer formed on its first end and obtained by stamping the first outer chamfer by the second plane, and a third outer chamfer formed on its second end and obtained by stamping the outer periphery of the first end plane by the second plane, the depth of the second outer chamfer is shallower than the depth of the first outer chamfer, and the slope of the second outer chamfer is greater than the slope of the first outer chamfer.

10. The cold heading method according to claim 3, characterized in that: The groove member further includes the first positioning groove disposed at the second end portion thereof and surrounding the target counterbore, and the first positioning groove is coaxially disposed with the target counterbore.

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