A cold heading method for manufacturing a recess member

Abstract

The application discloses a cold upsetting method for manufacturing a recess component, comprising the following steps: obtaining a blank; sequentially performing upsetting treatment, shaping correction, positioning treatment, first punching, second punching and third punching on the blank through a cold upsetting machine and a cold upsetting die assembly loaded in the cold upsetting machine, and sequentially transforming the blank into a first intermediate body, a second intermediate body, a third intermediate body, a fourth intermediate body, a fifth intermediate body, a sixth intermediate body and the recess component. An outer inclined transition bottom surface is prepared first, and the surface is used as a reference surface to ensure a unified positioning reference in subsequent processing procedures. The positioning treatment further ensures the position precision of a target counterbore and an inner inclined bottom surface located in the counterbore. The third punching operation makes the flow of the blank more uniform during the deformation process, avoids stress concentration and crack generation, and further ensures the smooth completion of the preparation process.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of cold heading machining technology. More specifically, the present invention relates to a cold heading method for manufacturing grooved components. Background Technology

[0002] Cold heading machines are stamping machines used in mechanical manufacturing, primarily for forming metals at room temperature using plastic deformation. They perform upsetting and extrusion operations on metal blanks using dies. Compared to preparing flat end faces, inclined surfaces are more likely to cause changes in the direction of the blank during flow and a reduction in flow velocity. Therefore, in existing technologies, especially when machining countersunk holes with inwardly inclined bottom surfaces within the blank, the application of cold heading machines faces challenges, mainly for the following reasons:

[0003] To produce an inclined surface, a matching inclined surface needs to be set at the top pressing end of the front punch. However, during the cold heading process, the constantly changing angle and shape of the inclined surface cause the billet to experience different resistances as it flows. This difference in resistance leads to inconsistent flow rates of the billet at the inclined surface and other parts, resulting in uneven pressure. This can cause problems such as localized stress concentration and cracks, hindering the smooth completion of the manufacturing process.

[0004] In view of this, how to use a cold heading machine to prepare grooved components has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address one or more of the technical problems mentioned above, the present invention provides a cold heading method for manufacturing grooved components.

[0006] This application provides a cold heading method for manufacturing grooved components, which includes the following steps: Obtain the billet; The blank is subjected to upsetting, shaping and correction, positioning, first punching, second punching and third punching in sequence by a cold heading machine and the cold heading mold assembly installed therein, and the blank is transformed in sequence into a first intermediate body, a second intermediate body, a third intermediate body, a fourth intermediate body, a fifth intermediate body, a sixth intermediate body and the grooved component. in: The third intermediate includes the outwardly inclined transition bottom surface formed on its first end; The fourth intermediate also includes the outwardly inclined transition bottom surface formed on its first end; The fifth intermediate includes the outwardly inclined transition bottom surface formed on its first end, and a first countersunk hole formed therein and extending from its second end toward the outwardly inclined transition bottom surface, the first countersunk hole having a flat inner bottom surface; The sixth intermediate body includes the outwardly inclined transition bottom surface formed on its first end, and a second countersunk hole formed therein and obtained by deformation of the first countersunk hole, the second countersunk hole having an inwardly inclined transition bottom surface obtained by deformation of the flat inner bottom surface; The groove member includes an outer inclined bottom surface formed on its first end and deformed from the outer inclined transition bottom surface, and a target countersunk hole formed therein and deformed from the second countersunk hole. The target countersunk hole has 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.

[0007] In one embodiment, the cold heading die assembly includes a third cold heading die, the third cold heading die including 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 being used to form the outwardly inclined transition bottom surface of the third intermediate body, and the pressing end of the third rear punch has a first boss; The shaping and correction steps include: transferring the second intermediate into the third mold cavity, and using the third front punch to cold press the second intermediate in the third mold cavity under the operation of the cold heading machine to obtain the third intermediate; The third intermediate body is pushed out of the third mold cavity using the third rear punch, wherein the third intermediate body further includes a fourth outer chamfer formed on its second end and obtained by the first boss punching the third outer chamfer of the second intermediate body.

[0008] 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 outwardly inclined transition bottom surface of the third intermediate body; The positioning process includes: transferring the ejected third intermediate and inverting it into the fourth mold cavity; and using the fourth front punch to cold press the third intermediate in the fourth mold cavity under the operation of the cold heading machine to obtain the fourth intermediate. The fourth intermediate body is pushed out of the fourth mold cavity using the fourth rear 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, which causes the fourth outer chamfer to shrink or disappear.

[0009] In one embodiment, the cold heading die assembly further includes a fifth cold heading die, the fifth cold heading die including a fifth front punch, a fifth die body and 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 into a first countersunk hole of the fifth intermediate, and the pressing end of the fifth rear punch has a third inclined surface for abutting against the outwardly inclined transition bottom surface of the fourth intermediate and retaining it on the fifth intermediate; The step of punching includes: transferring the fourth intermediate to be ejected to the fifth mold cavity, and using the fifth front punch to cold press the fourth intermediate in the fifth mold cavity under the operation of the cold heading machine to obtain the fifth intermediate; The fifth intermediate is pushed out of the fifth mold cavity using the fifth rear punch.

[0010] 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 being used to form the flat inner surface of the first countersunk hole of the fifth intermediate into the inner inclined transition bottom surface of the second countersunk hole of the sixth intermediate; the pressing end of the sixth rear punch is provided with a fifth inclined surface, the fifth inclined surface being used to abut against the outer inclined transition bottom surface of the sixth intermediate and retain it on the sixth intermediate; The secondary punching step includes: transferring the ejected fifth intermediate to the sixth mold cavity, and using the sixth front punch to cold press the fifth intermediate in the sixth mold cavity under the operation of the cold heading machine to obtain the sixth intermediate; The sixth intermediate is pushed out of the sixth mold cavity using the sixth rear punch.

[0011] In one embodiment, the cold heading die assembly further includes a seventh cold heading die, which 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. The top pressing end of the seventh front punch is provided with a sixth inclined surface, which is used to form the inner inclined transition bottom surface of the second countersunk hole of the sixth intermediate body into the inner inclined bottom surface of the target countersunk hole of the groove member. The top pressing end of the seventh rear punch is provided with a seventh inclined surface, which is used to form the outer inclined transition bottom surface of the sixth intermediate body into the outer inclined bottom surface of the groove member. The three-stage punching process includes: transferring the ejected sixth intermediate to the seventh mold cavity, and using the seventh front punch to cold-press the sixth intermediate in the seventh mold cavity under the operation of the cold heading machine to obtain the groove component; The grooved component is pushed out of the seventh mold cavity using the seventh rear punch.

[0012] In one embodiment, the upsetting process includes a primary upsetting process and a secondary upsetting process, wherein the primary upsetting process yields the first intermediate and the secondary upsetting process yields the second intermediate.

[0013] In one embodiment, the cold heading die assembly further includes a first cold heading die, the first cold heading die including a first front punch, a first die body and 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 pressing end of the first front punch is provided with a first flat surface; The steps of the first upsetting process include: The blank is transferred into the first mold cavity, and under the operation of the cold heading machine, the blank in the first mold cavity is first cold-pressed and formed by the first front punch to obtain the first intermediate body; The first intermediate body is pushed out of the first mold cavity using the first rear punch, wherein the first intermediate body includes a first outer chamfer formed on its first end and shaped by the first conical surface, and a first flat end face formed on its second end and shaped by the first plane.

[0014] 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 forming 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 pressing end of the second front punch is provided with a second flat surface; The steps of the secondary upsetting process include: The first intermediate is transferred and inverted into the second mold cavity. Under the operation of the cold heading machine, the blank in the second mold cavity is first cold-pressed and formed by the second front punch to obtain the second intermediate. The second intermediate body is ejected from the second mold cavity using the second rear punch. The second intermediate body includes a second outer chamfer formed on its first end and obtained by stamping the first outer chamfer with the second plane, and a third outer chamfer formed on its second end and obtained by stamping the outer periphery of the first flat end face with 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.

[0015] In one embodiment, the groove member further includes a first positioning groove disposed at its second end and surrounding the target countersunk hole, which is coaxially disposed with the target countersunk hole.

[0016] The cold heading method for manufacturing grooved components described above forms a flat inner bottom surface, an inwardly inclined transition bottom surface, and an inwardly inclined bottom surface at the bottom of the countersunk holes located inside the fourth, fifth, and sixth intermediate bodies through three consecutive punching operations. During the three punching operations, the outwardly inclined transition bottom surface at the first end of the sixth intermediate body is transformed into an outwardly inclined bottom surface. This transition bottom surface design makes the flow of the billet more uniform during the deformation process, avoids stress concentration and crack generation, and thus ensures the smooth completion of the manufacturing process. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 This is a schematic diagram of a cold heading method provided in an embodiment of the present invention; Figure 2 This is a schematic flowchart of a cold heading method provided in an embodiment of the present invention; Figure 3a This is a cross-sectional view of the first intermediate in an embodiment of the present invention; Figure 3b For preparation Figure 3a A cross-sectional view of the first cold heading die for the first intermediate shown; Figure 4a This is a cross-sectional view of the second intermediate in an embodiment of the present invention; Figure 4b For preparation Figure 4a A cross-sectional view of the second cold heading die for the second intermediate body shown; Figure 5a This is a cross-sectional view of the third intermediate in an embodiment of the present invention; Figure 5b For preparation Figure 5a A cross-sectional view of the third cold heading die for the third intermediate shown; Figure 6a This is a cross-sectional view of the fourth intermediate in an embodiment of the present invention; Figure 6b For preparation Figure 6a A cross-sectional view of the fourth cold heading die for the fourth intermediate shown; Figure 7a This is a cross-sectional view of the fifth intermediate in an embodiment of the present invention; Figure 7b For preparation Figure 7a A cross-sectional view of the fifth cold heading die for the fifth intermediate shown; Figure 8a This is a cross-sectional view of the sixth intermediate in an embodiment of the present invention; Figure 8b For preparation Figure 8a A cross-sectional view of the sixth cold heading die for the sixth intermediate shown; Figure 9a This is a cross-sectional view of the grooved component according to an embodiment of the present invention; Figure 9b For preparation Figure 9a A cross-sectional view of the seventh cold heading die for the grooved component shown; Explanation of reference numerals in the attached drawings: 100, billet; 110, first intermediate body; 111, first outer chamfer; 112, first flat end face; 120, second intermediate body; 121, second outer chamfer; 122, third outer chamfer; 130, third intermediate body; 131, outer inclined transition bottom surface; 132, fourth outer chamfer; 140, fourth intermediate body; 141, first positioning groove; 150, fifth intermediate body; 151, first countersunk hole; 1511, flat inner bottom surface; 160, sixth intermediate body; 161, second countersunk hole; 1611, inner inclined transition... 170. Groove component; 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 conical surface; 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 part; 252. Fifth die 253, Fifth rear punch; 2531, Third inclined surface; 254, Fifth mold cavity; 260, Sixth cold heading mold; 261, Sixth front punch; 2611, First rod part; 262, Sixth mold body; 263, Sixth rear punch; 2631, Third inclined surface; 264, Sixth mold cavity; 270, Seventh cold heading mold; 271, Seventh front punch; 2711, Sixth inclined surface; 272, Seventh mold body; 273, Seventh rear punch; 2731, Seventh inclined surface; 274, Seventh mold cavity; D1, First end; D2, Second end. Detailed Implementation

[0018] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0019] First, it should be noted that the grooved component 170 to be prepared in the embodiments of this application is as follows: Figure 9aAs shown, its outer bottom surface (i.e., the first end D1) is an outwardly inclined bottom surface 171, and an upward-facing (i.e., towards the second end D2) target counterbore 172 is provided inside. The bottom of the target counterbore 172 is an inwardly inclined bottom surface 1721, and the inwardly inclined bottom surface 1721 and the outwardly inclined bottom surface 171 are arranged parallel to each other. In particular, during the preparation of the inwardly inclined bottom surface 1721, due to the continuous changes in the angle and shape of the slope, the billet will be subject to different resistances during flow. This difference in resistance will cause the flow velocity of the billet at the slope to be inconsistent with that of other parts, resulting in uneven pressure. This will lead to problems such as local stress concentration and cracks, hindering the smooth completion of the preparation process.

[0020] To solve the technical problems existing in the preparation of the aforementioned grooved component 170, such as Figure 1 and Figure 2 As shown, this application provides a cold upsetting method for manufacturing grooved components. First, a blank 100 is obtained. Then, step S100 is executed to upset the blank 100, sequentially obtaining a first intermediate body 110 and a second intermediate body 120. For the specific upsetting methods of the obtained first intermediate body 110 and second intermediate body 120, those skilled in the art can design them with reference to existing technologies, and no limitations are made here.

[0021] Then, S200 is executed: the second intermediate 120 is reshaped and corrected to obtain the third intermediate 130. (See reference...) Figure 5a As shown, the third intermediate 130 includes an outwardly inclined transition bottom surface 131 formed on its first end D1.

[0022] After executing S200, execute S300: perform positioning processing on the third intermediate 130 to obtain the fourth intermediate 140. (See reference...) Figure 6a As shown, the fourth intermediate 140 also includes an outwardly inclined transition bottom surface 131 formed on its first end D1.

[0023] After executing S300, execute S400: punch a hole in the fourth intermediate 140 to obtain the fifth intermediate 150. (Refer to...) Figure 7a As shown, the fifth intermediate body 150 includes an outwardly inclined transition bottom surface 131 formed on its first end, and a first countersunk hole 151 formed therein and extending outwardly from its second end D2 to the outwardly inclined transition bottom surface 131, the first countersunk hole 151 having a flat inner bottom surface 1511.

[0024] After executing S400, execute S500: perform a second punching on the fifth intermediate 150 to obtain the sixth intermediate 160. (See reference...) Figure 7a and Figure 8aAs shown, the sixth intermediate body 160 includes an outwardly inclined transition bottom surface 131 formed on its first end, and a second countersunk hole 161 formed therein and obtained by deformation of the first countersunk hole 151, the second countersunk hole 161 having an inwardly inclined transition bottom surface 1611 obtained by deformation of the flat inner bottom surface 1511.

[0025] After executing S500, execute S600: punch the sixth intermediate body 160 three times to obtain the grooved component 170. For example... Figure 8a and Figure 9a As shown, the groove member 170 includes an outer inclined bottom surface 171 formed on its first end and obtained by deformation of the outer inclined transition bottom surface 131, and a target countersunk hole 172 formed inside it and obtained by deformation of the second countersunk hole 161. The target countersunk hole 172 has an inner inclined bottom surface 1721 obtained by deformation of 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.

[0026] In summary, to prepare the grooved component 170, the blank 100 needs to undergo upsetting, shaping and straightening, positioning, primary punching, secondary punching, and tertiary punching in sequence, transforming the blank 100 into a first intermediate body 110, a second intermediate body 120, a third intermediate body 130, a fourth intermediate body 140, a fifth intermediate body 150, and a sixth intermediate body 160, ultimately forming the aforementioned grooved component 170. The tertiary punching operation sequentially 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 holes located inside the fourth intermediate body 140, the fifth intermediate body 150, and the sixth intermediate body 160. During the tertiary punching, the outer inclined transition bottom surface 131 at the first end of the sixth intermediate body 160 is transformed into an outer inclined bottom surface 171. This transition bottom surface design ensures more uniform flow of the blank during deformation, avoiding stress concentration and crack formation, thus guaranteeing the smooth completion of the preparation process.

[0027] Based on the foregoing embodiments, the cold heading die components involved in each step are described below.

[0028] In some embodiments, the aforementioned S100 upsetting process includes a primary upsetting process and a secondary upsetting process.

[0029] Specifically, in combination Figure 3a as well as Figure 4a The first upsetting process is used to prepare the first intermediate 110, and the second upsetting process is used to prepare the second intermediate 120.

[0030] In the preparation of the first intermediate 110 through a single upsetting process, a first cold upsetting die 210 is required. For example... Figure 3b As shown, the first cold heading die 210 includes a first front punch 211, a first die body 212 and a first rear 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 rear punch 213.

[0031] Furthermore, the bottom of the cavity wall of the first mold cavity 214 has a first conical surface 2141, and the pressing end of the first front punch 211 is provided with a first flat surface 2111. In a single upsetting process, firstly, the cold upsetting machine transfers the blank 100 into the first mold cavity 214, and uses the first front punch 211 to cold press the blank 100 in the first mold cavity 214 to obtain the first intermediate body 110; the first rear punch 213 pushes the first intermediate body 110 out of the first mold cavity 214, wherein the first intermediate body 110 includes a first outer chamfer 111 formed on its first end D1 and shaped by the first conical surface 2141, and a first flat end face 112 formed on its second end D2 and shaped by the first flat surface 2111. Specifically, in conjunction with Figure 3a and Figure 3b As shown, the first end D1 of the blank 100 is first placed downwards into the first mold cavity 214. Then, the first front punch 211 is driven downwards, and the first flat surface 2111 at the bottom of the first front punch 211 presses the second end D2 of the blank 100. At the same time, the first conical surface 2141 presses the first end D1 of the blank 100, so that the blank 100 in the first mold cavity 214 is deformed by compression, forming the aforementioned first intermediate body 110. Finally, the first rear punch 213 is driven upwards to push the aforementioned first intermediate body 110 out of the first mold cavity 214. A second cold heading die 220 is required when preparing the second intermediate body 120 through secondary upsetting. Figure 4b As shown, the second cold heading die 220 includes a second front punch 221, a second die body 222 and 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. 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 flat surface 2211.

[0032] The secondary upsetting process includes: transferring and inverting the first intermediate body 110 into the second mold cavity 224; cold pressing the blank 100 in the second mold cavity 224 under the operation of a cold upsetting machine using the second front punch 221 to obtain the second intermediate body 120; and pushing the second intermediate body 120 out of the second mold cavity 224 using the second rear punch 223. The second intermediate body 120 includes a second outer chamfer 121 formed on its first end D1 by stamping a first outer chamfer 111 with a second plane 2211, and a third outer chamfer 122 formed on its second end D2 by stamping the outer periphery of the first flat end face 112 with a 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, the second end D2 of the first intermediate body 110 is first placed downwards into the second mold cavity 224. Then, the second front punch 221 is driven to move downwards, and the second plane 2211 at the bottom of the second front punch 221 presses 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 transformed into a shallower second outer chamfer 121. At the same time, the second conical surface 2241 presses the first flat end face 112 located at the second end D2 of the first intermediate body 110, so that the first flat end face 112 is transformed into a third outer chamfer 122. The first intermediate body 110 is deformed by compression within the second mold cavity 224, thereby forming the aforementioned second intermediate body 120. Finally, the second rear punch 223 is driven to move upwards, pushing the aforementioned second intermediate body 120 out of the second mold cavity 224.

[0033] By performing the upsetting process on the billet 100 as described above, a third intermediate body 130 with an outwardly inclined transition bottom surface 131 is obtained. This inclined transition bottom surface 131 is used as a reference surface to ensure a unified positioning reference in subsequent processing steps, avoiding the cumulative errors caused by frequent changes in the reference surface between different processes. In addition, the two upsetting processes can remove burrs from both ends of the billet 100, improving the flatness of the billet.

[0034] In some embodiments, the shaping and correction in S200 described above requires the use of a third cold heading die 230. For example... 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, as well as a third die cavity 234 formed between the third die body 232 and the third rear punch 233. The pressing end of the third front punch 231 has a first inclined surface 2311, which is used to form the outwardly inclined transition bottom surface 131 of the third intermediate body 130. The pressing end of the third rear punch 233 has a first boss 2331.

[0035] The shaping and correction steps include: transferring the second intermediate body 120 into the third mold cavity 234; cold-pressing the second intermediate body 120 within the third mold cavity 234 using the third front punch 231 under the operation of a cold heading machine to obtain the third intermediate body 130; and pushing the third intermediate body 130 out of the third mold cavity 234 using the third rear punch 232. The third intermediate body 130 also includes a fourth outer chamfer 132 formed on its second end D2 and obtained by the first boss 2331 stamping the third outer chamfer 122 of the second intermediate body 120. Specifically, combined with... Figure 4a and Figure 5b As shown, the second end D2 of the second intermediate body 120 is first placed downwards into the third mold cavity 234. Then, the third front punch 231 is driven downwards, and the first inclined surface 2311 at the bottom of the third front punch 231 presses 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 shaped into an outwardly inclined transition bottom surface 131. At the same time, the first boss 2331 presses 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 shaped into a fourth outer chamfer 132. The second intermediate body 120 is deformed by compression within the third mold cavity 234, thereby forming the aforementioned third intermediate body 130. Finally, the third rear punch 232 is driven upwards to push the aforementioned formed third intermediate body 130 out of the third mold cavity 234. In some embodiments, the positioning process in the aforementioned S300 requires the use of a fourth cold heading die 240. Figure 6b As shown, the fourth cold heading die 240 includes a fourth front punch 241, a fourth die body 242 and 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. 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 outwardly inclined transition bottom surface 131 of the third intermediate body 130.

[0036] The positioning process includes: transferring and inverting the ejected third intermediate 130 into the fourth mold cavity 244; cold-pressing the third intermediate 130 in the fourth mold cavity 244 using the fourth front punch 241 under the operation of a cold heading machine to obtain the fourth intermediate 140; and ejecting the fourth intermediate 140 from the fourth mold cavity 244 using the fourth rear punch 243. The fourth intermediate 140 also includes a first positioning groove 141 formed by the second boss 2411 on the second end D2 of the third intermediate 130, which causes the fourth outer chamfer 132 to shrink or disappear. Specifically, in conjunction with... Figure 5a and Figure 6bAs shown, the first end D1 of the third intermediate body 130 is first placed downwards into the fourth mold cavity 244. Then, the fourth front punch 241 is driven to move downwards, and the second boss 2411 at the bottom of the fourth front punch 241 presses against 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 form the first positioning groove 141. At the same time, the second inclined surface 2431 located at the top of the fourth rear punch 243 abuts 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 deformed by compression in the fourth mold cavity 244, thereby forming the aforementioned fourth intermediate body 140. Finally, the fourth rear punch 243 is driven to move upwards, pushing the aforementioned fourth intermediate body 140 out of the fourth mold cavity 244.

[0037] The first positioning groove 141 formed by the positioning process of S300 will always exist. It has a positioning and guiding function, enabling the front punch to be quickly positioned at the end of the blank for stamping, which helps to improve processing efficiency. Figure 9a As shown, the finally obtained groove component 170 includes a first positioning groove 141 disposed at its second end D2 and surrounding the target counterbore 172. It is coaxially disposed with the target counterbore 172. This positioning process will further ensure the positional accuracy of the target counterbore 172 formed inside the groove component 170 and the inner inclined bottom surface 1721 located inside the target counterbore 172. At the same time, it can also ensure that the subsequent three punchings are performed at the same reference position, making the processing process smoother.

[0038] In some embodiments, the punching operation in S400 described above requires the use of a fifth cold heading die 250. For example... Figure 7b As shown, the fifth cold heading die 250 includes a fifth front punch 251, a fifth die body 252 and 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. 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 the first countersunk hole 151 of the fifth intermediate body 150. The pressing end of the fifth rear punch 253 has a third inclined surface 2531 for abutting against the outwardly inclined transition bottom surface 131 of the fourth intermediate body 140 and retaining it on the fifth intermediate body 150. The punching process includes: transferring the ejected fourth intermediate 140 to the fifth mold cavity 254; cold pressing the fourth intermediate 140 within the fifth mold cavity 254 using the fifth front punch 251 under the operation of a cold heading machine to obtain the fifth intermediate 150; and ejecting the fifth intermediate 150 from the fifth mold cavity 254 using the fifth rear punch 253. Specifically, combined with... Figure 6a and Figure 7bAs shown, the first end D1 of the fourth intermediate body 140 is first placed downwards into the fifth mold cavity 254. Then, the fifth front punch 251 is driven to move downwards, and the first rod portion 2511 at the bottom of the fifth front punch 251 presses against the first positioning groove 141 located at the second end D2 of the fourth intermediate body 140. As the first rod portion 2511 moves downwards, a first countersunk hole 151 with a flat inner surface 1511 is formed. At the same time, the top of the fifth rear punch 253 abuts against the outwardly inclined transition bottom surface 131 located at the first end D1 of the fourth intermediate body 140. The fourth intermediate body 140 is deformed by compression within the fifth mold cavity 254, thereby forming the aforementioned fifth intermediate body 150. Finally, the fifth rear punch 253 is driven to move upwards, pushing the aforementioned fifth intermediate body 150 out of the fifth mold cavity 254.

[0039] In some embodiments, the secondary punching in S500 requires the use of a sixth cold heading die 260. For example... Figure 8b As shown, the sixth cold heading die 260 includes a sixth front punch 261, a sixth die body 262, and a sixth rear punch 263 embedded in the sixth die body 262, as well as a sixth die cavity 264 formed between the sixth die body 262 and the sixth rear punch 263. The top pressing end of the sixth front punch 261 is provided with a fourth inclined surface 2611, which is used to form 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. The top pressing end of the sixth rear punch 263 is provided with a fifth inclined surface 2631, which 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.

[0040] The secondary punching process includes: transferring the ejected fifth intermediate 150 to the sixth mold cavity 264; cold pressing the fifth intermediate 150 within the sixth mold cavity 264 using the sixth front punch 261 under the operation of a cold heading machine to obtain the sixth intermediate 160; and ejecting the sixth intermediate 160 from the sixth mold cavity 264 using the sixth rear punch 263. Specifically, combined with... Figure 7a and Figure 8bAs shown, the first end D1 of the fifth intermediate body 150 is first placed downwards into the sixth mold cavity 264. Then, the sixth front punch 261 is driven to move downwards, and the fourth inclined surface 2611 at the bottom of the sixth front punch 261 presses against the flat inner surface 1511 located within the fifth intermediate body 150, so that the flat inner surface 1511 is formed into an inwardly inclined transition bottom surface 1611. At the same time, the top of the sixth rear punch 263 abuts against the outwardly inclined transition bottom surface 131 located at the first end D1 of the fifth intermediate body 150. The fifth intermediate body 150 is deformed by compression within the sixth mold cavity 264, thereby forming the aforementioned sixth intermediate body 160. Finally, the sixth rear punch 263 is driven to move upwards, removing the aforementioned formed sixth intermediate body 160 from the sixth mold cavity 264.

[0041] In some embodiments, the third punching in S600 requires the use of a seventh cold heading die 270. For example... Figure 9b As shown, the seventh cold heading die 270 includes a seventh front punch 271, a seventh die body 272, and a seventh rear punch 273 embedded in the seventh die body 272, as well as a seventh die cavity 274 formed between the seventh die body 272 and the seventh rear punch 273. The top pressing end of the seventh front punch 271 is provided with a sixth inclined surface 2711, which is used to form the inner inclined transition bottom surface 1611 of the second countersunk hole 161 of the sixth intermediate body 160 into the inner inclined bottom surface 1721 of the target countersunk hole 172 of the groove member 170. The top pressing end of the seventh rear punch 273 is provided with a seventh inclined surface 2731, which 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 member 170.

[0042] The three-stage punching process includes: transferring the ejected sixth intermediate 160 into the seventh mold cavity 274; cold-pressing the sixth intermediate 160 within the seventh mold cavity 274 using the seventh front punch 271 under the operation of a cold heading machine to obtain the grooved component 170; and ejecting the grooved component 170 from the seventh mold cavity 274 using the seventh rear punch 273. Specifically, combined with... Figure 8a and Figure 9bAs shown, the first end D1 of the sixth intermediate 160 is first placed downwards into the seventh mold cavity 274. Then, the seventh front punch 271 is driven downwards, and the sixth inclined surface 2711 at the bottom of the seventh front punch 271 presses the inner inclined transition bottom surface 1611 inside the sixth intermediate 160, so that the inner inclined transition bottom surface 1611 is shaped into an inner inclined bottom surface 1721. At the same time, the seventh inclined surface 2731 at the top of the seventh rear punch 273 presses the outer inclined transition bottom surface 131, so that the outer inclined transition bottom surface 131 is shaped into an outer inclined bottom surface 171. The sixth intermediate 160 is deformed by compression within the seventh mold cavity 274, thereby forming the aforementioned groove member 170. Finally, the seventh rear punch 273 is driven upwards to push the groove member 170 out of the seventh mold cavity 274, completing the fabrication process.

[0043] In the foregoing description of this application, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "linked" should be interpreted broadly. For example, the term "linked" can refer to a fixed connection, a detachable connection, or an integral connection; 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 refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this application, those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] Based on the above description of this application, those skilled in the art will also understand that the terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are based on the orientation or positional relationship shown in the accompanying drawings of this application. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as a limitation on the present invention.

[0045] Furthermore, the terms "first" or "second," etc., used in this application to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as explicitly or implicitly indicating relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0046] While numerous embodiments of the 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. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of the invention. The appended claims are intended to define the scope of protection of the invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A cold heading method for manufacturing grooved components, characterized in that, It includes the following steps: Obtain the billet; The blank is subjected to upsetting, shaping and correction, positioning, first punching, second punching and third punching in sequence by a cold heading machine and the cold heading mold assembly installed therein, and the blank is transformed in sequence into a first intermediate body, a second intermediate body, a third intermediate body, a fourth intermediate body, a fifth intermediate body, a sixth intermediate body and the grooved component. in: The third intermediate includes an outwardly inclined transition bottom surface formed on its first end; The fourth intermediate also includes the outwardly inclined transition bottom surface formed on its first end; The fifth intermediate includes the outwardly inclined transition bottom surface formed on its first end, and a first countersunk hole formed therein and extending from its second end toward the outwardly inclined transition bottom surface, the first countersunk hole having a flat inner bottom surface; The sixth intermediate body includes the outwardly inclined transition bottom surface formed on its first end, and a second countersunk hole formed therein and obtained by deformation of the first countersunk hole, the second countersunk hole having an inwardly inclined transition bottom surface obtained by deformation of the flat inner bottom surface; The groove member includes an outer inclined bottom surface formed on its first end and deformed from the outer inclined transition bottom surface, and a target countersunk hole formed therein and deformed from the second countersunk hole. The target countersunk hole has 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 includes a third cold heading die, which includes 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. The pressing end of the third front punch has a first inclined surface, which is used to form the outwardly inclined transition bottom surface of the third intermediate body. The pressing end of the third rear punch has a first boss. The steps of the plastic surgery correction include: The second intermediate is transferred into the third mold cavity, and under the operation of the cold heading machine, the second intermediate in the third mold cavity is cold-pressed using the third front punch to obtain the third intermediate; The third intermediate body is pushed out of the third mold cavity using the third rear punch. The third intermediate also includes a fourth outer chamfer formed on its second end and obtained by the first boss stamping the third outer chamfer of the second intermediate.

3. The cold heading method according to claim 2, characterized in that, The cold heading die assembly further includes a fourth cold heading die, which 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. 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 outwardly inclined transition bottom surface of the third intermediate body. The positioning process includes: transferring the ejected third intermediate and inverting it into the fourth mold cavity; and using the fourth front punch to cold press the third intermediate in the fourth mold cavity under the operation of the cold heading machine to obtain the fourth intermediate. The fourth intermediate body is pushed out of the fourth mold cavity using the fourth rear 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, which causes the fourth outer chamfer to shrink or disappear.

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

5. The cold heading method according to claim 4, characterized in that, The cold heading die assembly further includes a sixth cold heading die, which 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. The top pressing end of the sixth front punch is provided with a fourth inclined surface, which is used to form the flat inner surface of the first countersunk hole of the fifth intermediate into the inner inclined transition bottom surface of the second countersunk hole of the sixth intermediate. The top pressing end of the sixth rear punch is provided with a fifth inclined surface, which is used to abut against the outer inclined transition bottom surface of the sixth intermediate and retain it on the sixth intermediate. The secondary punching step includes: transferring the ejected fifth intermediate to the sixth mold cavity, and using the sixth front punch to cold press the fifth intermediate in the sixth mold cavity under the operation of the cold heading machine to obtain the sixth intermediate; The sixth intermediate is pushed out of the sixth mold cavity using the sixth rear punch.

6. The cold heading method according to claim 5, characterized in that, The cold heading die assembly further includes a seventh cold heading die, which 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. The top pressing end of the seventh front punch is provided with a sixth inclined surface, which is used to form the inner inclined transition bottom surface of the second countersunk hole of the sixth intermediate body into the inner inclined bottom surface of the target countersunk hole of the groove member. The top pressing end of the seventh rear punch is provided with a seventh inclined surface, which is used to form the outer inclined transition bottom surface of the sixth intermediate body into the outer inclined bottom surface of the groove member. The three-stage punching process includes: transferring the ejected sixth intermediate to the seventh mold cavity, and using the seventh front punch to cold-press the sixth intermediate in the seventh mold cavity under the operation of the cold heading machine to obtain the groove component; The grooved component is pushed out of the seventh mold cavity using the seventh rear punch.

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

8. The cold heading method according to claim 7, characterized in that, The cold heading die assembly further includes a first cold heading die, the first cold heading die including a first front punch, a first die body and 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 pressing end of the first front punch is provided with a first flat surface; The steps of the first upsetting process include: The blank is transferred into the first mold cavity, and under the operation of the cold heading machine, the blank in the first mold cavity is cold-pressed and formed by the first front punch to obtain the first intermediate. The first intermediate body is pushed out of the first mold cavity using the first rear punch, wherein the first intermediate body includes a first outer chamfer formed on its first end and shaped by the first conical surface, and a first flat end face formed on its second end and shaped 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 forming 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 flat surface; The steps of the secondary upsetting process include: The first intermediate is transferred and inverted into the second mold cavity. Under the operation of the cold heading machine, the blank in the second mold cavity is first cold-pressed and formed by the second front punch to obtain the second intermediate. The second intermediate body is ejected from the second mold cavity using the second rear punch. The second intermediate body includes a second outer chamfer formed on its first end and obtained by stamping the first outer chamfer with the second plane, and a third outer chamfer formed on its second end and obtained by stamping the outer periphery of the first flat end face with 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 component further includes a first positioning groove disposed at its second end and surrounding the target countersunk hole, which is coaxially disposed with the target countersunk hole.

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