A forming die for spherical workpieces

Abstract

This utility model discloses a forming mold for spherical workpieces, including an upper punch assembly, comprising an upper punch base, an upper punch head, and a first driving component. The upper punch head is mounted on the upper punch base and can move up and down; the lower end of the upper punch head is provided with a first arc-shaped cavity segment. A lower punch assembly includes a lower punch base and a lower punch head, the lower punch head being mounted on the lower punch base and capable of moving up and down; the upper end of the lower punch head is provided with a forming cavity. A middle die assembly includes a middle die base, which passes through the forming cavity and can move up and down; the middle die base is provided with a second arc-shaped cavity segment, the second arc-shaped cavity segment corresponding to the first arc-shaped cavity segment. A mandrel assembly includes a mandrel and a second driving component; the mandrel passes through the forming cavity and can move up and down; the mandrel is provided with a forming section, which movably passes through the second arc-shaped cavity segment; the outer surface of the forming section is provided with a guide surface. During forming, the workpiece can be positioned and guided by the forming section, reducing the possibility of the upper punch head damaging the workpiece during downward forming.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a shaping mold for spherical workpieces. Background Technology

[0002] In powder metallurgy products, when processing workpieces with spherical or arc-shaped surfaces, such as spherical bearings, the workpiece is usually machined into an inclined structure during the production process, and then placed in a forming mold for spherical or arc-shaped forming.

[0003] In existing forming dies, the mandrel structure is connected to the upper punch. During forming, the workpiece to be formed is placed in the forming cavity of the lower punch. The upper punch moves downward, and the mandrel needs to be inserted into the hole of the workpiece. However, during this process, it is not easy for the mandrel to be aligned with the middle hole of the workpiece as it descends. Therefore, it is easy to damage the workpiece during the descent, resulting in a low workpiece yield. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides a forming mold for spherical workpieces, wherein the workpiece can be positioned and guided by the forming section during forming, thereby reducing the possibility of the upper punch damaging the workpiece when forming downwards.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] A forming mold for a spherical workpiece, comprising,

[0007] The upper punch assembly includes an upper punch base, an upper punch head, and a first driving member. The upper punch head is mounted on the upper punch base and can move up and down. The lower end of the upper punch head is provided with a first arc-shaped cavity. The first driving member is used to drive the upper punch head to move up and down.

[0008] The lower punch assembly includes a lower punch base and a lower punch head. The lower punch head is mounted on the lower punch base and can move up and down. A forming cavity is provided at the upper end of the lower punch head.

[0009] The middle mold assembly includes a middle mold base, which passes through the molding cavity and can move up and down. The middle mold base is provided with a second arc-shaped cavity segment, which is correspondingly provided with the first arc-shaped cavity segment.

[0010] The mandrel assembly includes a mandrel and a second driving member. The mandrel passes through the molding cavity and can move up and down. The mandrel is provided with a molding section, which is movably connected to the second arc-shaped cavity section. The second driving member is used to drive the mandrel to move up and down. The outer surface of the molding section is provided with a guide surface.

[0011] As an optional implementation, the lower punch assembly further includes an adjusting seat, a supporting seat, a lower punch pad, and a first elastic component. The adjusting seat is connected to the lower punch base. The outer wall of the supporting seat is provided with a first threaded section. The adjusting seat is provided with a threaded connector and a through hole. The supporting seat is movably connected to the through hole and threadedly connected to the threaded connector through the first threaded section. The lower punch pad is connected to the upper punch head through an adjusting rod. The adjusting rod is connected to the lower punch pad and drives the lower punch pad to move upward. The upper end of the first elastic component abuts against the lower punch pad, and the lower end of the first elastic component abuts against the supporting seat. The lower punch head is connected to the upper end of the lower punch pad.

[0012] A first guide is provided outside the support base, and a second guide is provided inside the through hole; the second guide slides up and down with the first guide.

[0013] As an optional implementation, the first threaded segment is externally threaded and connected to a first limiting member; the lower end of the first elastic member abuts against the first limiting member.

[0014] As an optional implementation, the molding cavity is provided with a first limiting step and a second elastic component, the middle mold base is located above the first limiting step; the lower end of the lower punch is provided with a second limiting step; the upper end of the second elastic component abuts against the lower end of the middle mold base, and the lower end of the second elastic component abuts against the second limiting step.

[0015] As an optional implementation, the upper punch is provided with an upper punch bracket, the upper end of the adjusting rod is connected to the upper punch bracket, the lower end of the adjusting rod is movably connected to the lower punch pad, and the lower end of the adjusting rod is provided with a second limiting member.

[0016] As an optional implementation, the lower end of the adjusting rod is provided with a second threaded section, and the second threaded section is externally threaded to a second limiting member.

[0017] As an optional implementation, the molding cavity is provided with an upper middle mold sleeve and a lower middle mold sleeve, both of which are inserted into and fixedly disposed within the molding cavity; the inner wall of the upper middle mold sleeve is provided with a lubrication groove, which extends along the height direction of the upper middle mold sleeve; the first limiting step is disposed on the inner wall of the lower middle mold sleeve.

[0018] As an optional implementation, the first guide includes a guide groove that extends along the height direction of the support; the second guide includes a guide post that slides in conjunction with the guide groove.

[0019] As an optional implementation, the mandrel assembly further includes a mandrel seat, which is connected to the lower punch holder via a connecting post, and the second drive member is mounted on the mandrel seat;

[0020] The mandrel base is provided with a limiting frame; the limiting frame is provided with a through hole; the bottom end of the mandrel passes through the through hole and is connected to the driving end of the second driving member; the bottom end of the mandrel is provided with a third limiting member and a fourth limiting member, the third limiting member and the fourth limiting member are spaced apart in the height direction of the mandrel, and are respectively located above and below the limiting frame.

[0021] As an optional implementation, the second driving component includes a driving cylinder, the cylinder body of which is connected to the mandrel seat, and the movable rod of which is connected to the lower end of the mandrel.

[0022] In summary, this utility model has the following technical effects:

[0023] 1. When the workpiece is placed, the forming section of the mandrel can be used as the positioning axis. The forming section of the mandrel passes through the middle hole of the workpiece. Since the outer wall of the forming section is provided with a guide face, the guide face can guide the workpiece and the mandrel to maintain coaxial assembly during the process of workpiece insertion, reducing the possibility of the workpiece being crushed during the forming process.

[0024] / 2. During the downward pressing process of the upper punch, the lower punch can adaptably move downwards, so that the workpiece can be pressed downwards into the second arc-shaped cavity section under the pressure of the upper punch. During the downward movement of the workpiece, the mandrel can always guide and center it at the middle hole of the workpiece, reducing the damage caused by workpiece swaying during the pressing process. After the first arc-shaped cavity section of the upper punch and the second arc-shaped cavity section of the middle die base are engaged, the upper and lower ends of the workpiece can be arc-shaped by the arc surfaces of the first and second arc-shaped cavities respectively, completing the workpiece shaping action. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a cross-sectional view of the present invention;

[0028] Figure 3This is a schematic diagram of the assembly structure of the upper punch, lower punch, and middle die base of this utility model;

[0029] Figure 4 This is a cross-sectional view of the assembly structure of the upper punch, lower punch, and middle die base of this utility model;

[0030] Figure 5 This is a schematic diagram of the upper punch of this utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the lower punch of this utility model;

[0032] Figure 7 This is a schematic diagram of the structure of the middle mold base of this utility model;

[0033] Figure 8 This is a schematic diagram of the upper sleeve of the middle mold of this utility model.

[0034] The meanings of the reference numerals in the attached drawings are as follows: 10, upper punch base; 11, upper punch head; 111, first arc-shaped cavity segment; 12, upper punch support; 13, adjusting rod; 131, second threaded segment; 132, second limiting component; 20, lower punch base; 201, forming cavity; 202, second elastic component; 203, upper sleeve of middle die; 204, lower sleeve of middle die; 205, first limiting step; 206, lubrication groove; 21, lower punch head; 211, second... 22. Limiting step; 221. Adjusting seat; 221. Threaded connector; 23. Support seat; 231. First threaded section; 232. First guide; 233. First limiting component; 30. Mandrel; 301. Forming section; 302. Third limiting component; 303. Fourth limiting component; 304. Guide front; 31. Second driving component; 32. Mandrel seat; 321. Connecting column; 322. Limiting frame; 40. Middle mold base; 401. Second arc-shaped cavity section. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0037] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0038] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0039] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0040] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0041] See Figures 1-8 This utility model discloses a forming mold for a spherical workpiece, including an upper punch assembly, a lower punch assembly, a middle die assembly, and a mandrel assembly. The upper punch assembly includes an upper punch base 10, an upper punch 11, and a first driving member. The upper punch 11 is installed on the upper punch base 10, and the upper punch 11 can move up and down under the drive of the first driving member. A first arc-shaped cavity section 111 is provided at the lower end of the upper punch 11.

[0042] The lower die assembly includes a lower die base and a lower punch 21. The lower punch 21 is mounted on the lower die base and can move up and down. A forming cavity 201 is provided at the upper end of the lower punch 21. The middle die assembly includes a middle die base 40, which is inserted into the forming cavity 201. The middle die base 40 can move up and down within the forming cavity 201. The middle die base 40 is provided with a second arc-shaped cavity segment 401, which corresponds to the first arc-shaped cavity segment 111.

[0043] The specific mandrel assembly includes a mandrel 30 and a second driving member 31. The mandrel 30 passes through the molding cavity 201 and can move up and down under the drive of the second driving member 31. The mandrel 30 is provided with a molding section 301, which is movably connected to the second arc-shaped cavity section 401.

[0044] Based on the above structure, when using the spherical workpiece forming mold of this utility model,

[0045] In the initial state, the middle mold base 40 can move upward, and the end face of the middle mold base 40 can be flush with the end face of the lower punch assembly. At the same time, the lower punch 21 can also move upward to the second arc-shaped cavity section 401, and the lower punch 21 moves until its end face is flush with the end face of the middle mold base 40. The forming section 301 of the mandrel 30 moves upward under the drive of the second drive member 31 until it passes through the lower punch 21 and extends upward.

[0046] When the workpiece is inserted, the forming section 301 of the mandrel 30 can be used as the positioning axis. The forming section 301 of the mandrel 30 passes through the middle hole of the workpiece. Since the outer wall of the forming section 301 is provided with a guide face 304, the guide face 304 can guide the workpiece and the mandrel 30 to maintain coaxial assembly during the insertion process. The top surface of the lower punch 21 supports the lower end surface of the workpiece.

[0047] It should be noted that the guide surface 304 can be selected as an inclined surface or an arc surface as in the prior art. When the inner wall of the workpiece's perforation contacts the inclined surface or the arc surface, taking the inclined surface as an example, after the inner wall of the workpiece's perforation is deflected, it fits against the inclined surface. Since the workpiece needs to move downwards, it can be adjusted along the normal direction of the inclined surface to achieve straight-line guidance. When the guide surface 304 is an arc surface, when the workpiece's perforation is deflected and contacts the arc surface, the change in the tangent direction of the arc guides the object to rotate around the center or axis of the arc surface, correcting the angular deviation, and finally aligning the object's axis with the center of the arc surface, thus achieving axial guidance of the workpiece.

[0048] Subsequently, the upper punch 11 is driven to move downward by the first driving member. When the upper punch 11 moves downward, the upper end of the workpiece can be inserted into the first arc-shaped cavity section 111 of the upper punch 11. The first driving member drives the upper punch 11 to press down continuously, and the inner wall of the first arc-shaped cavity section 111 of the upper punch 11 can perform arc-shaped shaping on the upper outer wall of the workpiece. Furthermore, during the downward pressing process of the upper punch 11, the lower punch 21 can adaptably move downwards, so that the workpiece can be pressed downwards into the second arc-shaped cavity section 401 under the pressure of the upper punch 11. During the downward movement of the workpiece, the mandrel 30 can always guide and center the workpiece at the middle hole position, reducing the damage caused by workpiece swaying during the pressing process. After the first arc-shaped cavity section 111 of the upper punch 11 and the second arc-shaped cavity section 401 of the middle die base 40 are engaged, the upper and lower ends of the workpiece can be arc-shaped by the arc surfaces of the first arc-shaped cavity section 111 and the second arc-shaped cavity section 401 respectively, completing the workpiece shaping action.

[0049] Of course, after the workpiece is shaped, it is necessary to remove the shaped workpiece. This can be achieved by moving the lower punch 21 upward to push the workpiece in the second arc-shaped cavity 401 upward, while the mandrel 30 can move downward to remove the workpiece, thus achieving smooth demolding of the workpiece.

[0050] As an optional implementation, the lower punch assembly further includes an adjusting seat 22, a support seat 23, a lower punch pad, and a first elastic component. The adjusting seat 22 is connected to the lower punch base. A first threaded section 231 is provided on the outer wall of the support seat 23. The adjusting seat 22 is provided with a threaded connector 221 and a through hole. The support seat 23 is movably connected to the through hole. After the support seat 23 is connected to the through hole, it can be threadedly connected to the threaded connector 221 through the first threaded section 231.

[0051] The aforementioned lower punch pad is connected to the upper punch 11 via an adjusting rod 13, and the adjusting rod 13 and the lower punch pad are slidably assembled vertically. The upper end of the first elastic component abuts against the lower punch pad, and the lower end of the first elastic component abuts against the support base 23. The lower punch 21 is connected to the upper end of the lower punch pad. A first guide 232 is provided outside the support base 23, and a second guide is provided inside the through hole. The second guide and the first guide 232 slide vertically together.

[0052] Based on this structure, in the initial state, the support seat 23 is connected to the lower punch seat through the adjusting seat 22. That is, when the adjusting seat 22 is stationary, the support seat 23 and the lower punch seat maintain a relatively fixed relationship. Since the upper end of the support seat 23 is provided with a first elastic member, which abuts against the lower punch pad, the lower punch pad and the adjusting rod 13 have a sliding tendency. Therefore, under the action of the first elastic member, the lower punch pad has an upward tendency, that is, the lower punch head 21 on the lower punch pad can maintain an upward state under the action of the first elastic member.

[0053] In the initial state, the first elastic component is clamped between the lower punch pad and the support base 23, thus providing elastic force to keep the lower punch 21 in an upward position. When the upper punch 11 moves downward, since the lower punch 21 is supported by the elastic stress provided by the first elastic component, the lower punch 21 will adapt to the downward movement of the upper punch 11. That is, the pressure exerted by the upper punch 11 on the workpiece will be applied to the lower punch 21, matching the action of the first elastic component.

[0054] Since the workpiece is generally formed by pressing with powder metallurgy, if the upper punch 11 directly applies pressure to the workpiece and the lower punch 21 makes hard contact with the lower end of the workpiece, then the pressure applied by the upper punch 11 to the upper end of the workpiece will inevitably be large, and the pressure is from top to bottom, so the force on the lower part of the workpiece is relatively small. Therefore, after the workpiece is shaped, the compaction density of the upper and lower parts is inconsistent.

[0055] In this embodiment, the lower punch 21 is supported by the elastic stress provided by the first elastic component. Compared with the direct application of a hard force to the lower punch 21, the first elastic component can apply a reaction force to match the force applied above after the upper punch 11 applies force to the upper end of the workpiece. In this way, the upper and lower ends of the workpiece are subjected to relatively balanced forces, and the density of the upper and lower parts of the workpiece can be relatively consistent during the forming process, so the quality of the workpiece forming is higher.

[0056] Furthermore, due to differences in workpiece size and type, the force applied to the workpiece and the downward stroke of the upper punch 11 during its downward movement also vary. Consequently, the position of the lower punch 21 extending into the second arc-shaped cavity section 401 and its retraction stroke will also differ. Thus, the rotatable support 23, which is threadedly assembled with the threaded part of the adjusting seat 22 via the first threaded section 231 and has the first guide 232 and the second guide slidingly engaged, can move up and down during the rotation of the support 23. This allows adjustment of the compression of the first elastic component located between the upper end of the support 23 and the lower punch pad. Since the compression of the first elastic component can be adjusted, the support force of the first elastic component on the lower punch pad can be adjusted accordingly, allowing for adjustments to be made for different types and sizes of workpieces.

[0057] Of course, when the workpiece is demolded, since the lower punch plate is connected to the upper punch 11 through the adjusting rod 13, after the upper punch 11 moves upward under the drive of the first driving member, the upper punch 11 demolds and separates from the upper end of the workpiece. The upper punch 11 is connected to the lower punch plate through the adjusting rod 13. After the upper punch 11 moves upward, the adjusting rod 13 can drive the lower punch plate to move upward together, pushing out the lower end of the workpiece and completing the demolding. In this way, the demolding of the upper end and the demolding of the lower end of the workpiece can both be completed by the first driving member driving the upper punch 11 to move upward, saving power resources.

[0058] As an optional implementation, a first limiting member 233 can be externally threaded onto the first threaded segment 231; the lower end of the first elastic member abuts against the first limiting member 233. The first limiting member 233 can be a nut or a threaded sleeve structure. When adjusting the elastic compression of the first elastic member, the first threaded segment 231 of the support seat 23 can be rotated relative to the adjusting seat 22 to move the support seat 23 up and down relative to the adjusting seat 22, thereby adjusting the position of the support seat 23 over a wide range to achieve a wide range of adjustment of the compression of the first elastic member. After the position of the support seat 23 is adjusted to the correct position, the first limiting member 233 can be further rotated to adjust the height of the first limiting member 233 on the support seat 23 by rotating the first threaded segment 231 relative to the thread, thereby making a small range of adjustment of the compression of the first elastic member. In this way, the compression adjustment accuracy of the first elastic member is higher, which is suitable for adjusting the support force after a small change in the size of the workpiece.

[0059] As an optional implementation, a first limiting step 205 and a second elastic member 202 may be provided in the molding cavity 201, and the middle mold base 40 may be located above the first limiting step 205. In addition, a second limiting step 211 may be provided at the lower end of the lower punch 21, the upper end of the second elastic member 202 abuts against the lower end of the middle mold base 40, and the lower end of the second elastic member 202 abuts against the second limiting step 211.

[0060] Thus, as the upper punch 11 moves downward, the first driving component continuously acts on the upper punch 11 downward, and the second elastic component 202 gradually compresses and retracts under this action until it abuts against the first limit step 205, at which point the middle die holder 40 stops moving downward. During this process, the elastic stress provided by the second elastic component 202 can also rebound and apply force to the lower circumferential direction of the workpiece located in the second arc-shaped cavity section 401 after the upper end of the workpiece is subjected to axial force. In this way, the upper and lower circumferential forces of the workpiece are relatively balanced, and the density of the upper and lower compaction of the workpiece during the forming process can be relatively consistent, so the quality of workpiece forming is higher.

[0061] As an optional implementation, an upper punch bracket 12 is provided on the upper punch head 11, the upper end of the adjusting rod 13 is connected to the upper punch bracket 12, and the lower end of the adjusting rod 13 is movably connected to the lower punch pad, and a second limiting member 132 is provided on the lower end of the adjusting rod 13.

[0062] In this way, when the upper punch 11 moves downward, the first driving member can drive the upper punch bracket 12 to move downward, and at the same time drive the upper punch 11 connected to the upper punch bracket 12 to move downward. During this process, the adjusting rod 13 connected to the upper punch bracket 12 can slide downward relative to the lower punch pad until the workpiece shaping action is completed.

[0063] After the workpiece shaping action is completed, the first driving component drives the upper punch bracket 12 to move upward, and at the same time drives the upper punch head 11 connected to the upper punch bracket 12 to move upward. The upper punch head 11 can then complete the demolding action from above and the upper end of the workpiece. During the upward movement of the upper punch bracket 12, the adjusting rod 13 connected to the upper punch bracket 12 can slide upward relative to the lower punch pad. When it slides upward until the second limiting component 132 abuts against the lower end of the lower punch pad, the adjusting rod 13 can drive the lower punch pad to move upward together, thereby driving the lower punch head 21 on the lower punch pad to move upward, pushing the workpiece out of the second arc-shaped cavity 401 and completing the demolding of the workpiece.

[0064] Since the second limiting member 132 maintains a certain distance from the lower punch plate when the upper punch 11 just begins to move upward, that is to say, the second limiting member 132 of the adjusting rod 13 only comes into contact with the lower punch plate after the upper punch 11 has moved upward to completely separate from the upper end of the workpiece, thereby driving the lower punch 21 to start demolding the lower end of the workpiece, preventing the workpiece from being damaged due to the lower punch 21 pushing upward when the upper punch 11 has not completely separated from the upper end of the workpiece.

[0065] As an optional implementation, a second threaded section 131 can be provided at the lower end of the adjusting rod 13. The second threaded section 131 is externally threaded to the aforementioned second limiting member 132. Since the second limiting member 132 and the second threaded section 131 are threadedly assembled, the position of the second limiting member 132 on the adjusting rod 13 can be adjusted, that is, the stroke of the lower punch 21 to begin demolding can be adjusted. The specific adjustment can be made according to the size and type of the product.

[0066] As an optional implementation, an upper middle mold sleeve 203 and a lower middle mold sleeve 204 can be provided in the molding cavity 201. The upper middle mold sleeve 203 and the lower middle mold sleeve 204 are both inserted and fixedly installed in the molding cavity 201. Based on this structure, the middle mold base 40 is set in the molding space formed after the upper middle mold sleeve 203 and the lower middle mold sleeve 204 are assembled. Specifically, a lubrication groove 206 can be provided on the inner wall of the upper middle mold sleeve 203. The lubrication groove 206 extends along the height direction of the upper middle mold sleeve 203. Since the middle mold base 40 needs to slide down to adapt to the downward pressure of the upper punch 11 during the molding process, when the middle mold base 40 slides with the upper middle mold sleeve 203, it can be lubricated by the lubricating oil added in the lubrication groove 206 to reduce the frictional resistance between the middle mold base 40 and the upper middle mold sleeve 203 when the middle mold base 40 slides down. Therefore, the rebound force of the second elastic component 202 is adapted to the upper punch pressure, so that the compaction density of the upper and lower parts is more likely to be consistent.

[0067] In addition, the first limiting step 205 is provided on the inner wall of the lower sleeve of the middle mold 204. In this way, the first limiting step 205 can restrict the downward position of the middle mold base 40. After the middle mold base 40 is in contact with the first limiting step 205, it will no longer move downward and can maintain the compaction action at this position.

[0068] Of course, since the lubrication groove 206 and the first limiting step 205 are both based on the upper sleeve 203 and the lower sleeve 204 of the middle mold, the upper sleeve 203 and the lower sleeve 204 of the middle mold can be processed separately and then assembled into the forming cavity 201 of the lower punch base. Compared with processing the lubrication groove 206 and the first limiting step 205 directly in the forming cavity 201, the process is simpler.

[0069] As an optional implementation, in this embodiment, the first guide 232 includes a guide groove that extends along the height direction of the support 23; and the second guide includes a guide post that slides in conjunction with the guide groove. When adjusting the position of the support 23, the first threaded section 231 of the support 23 can be rotated relative to the threaded part of the adjusting seat 22. This allows the guide post within the guide groove to restrict the rotational movement of the support 23, enabling the support 23 to move up and down during rotation, thereby adjusting the position of the support 23 and consequently, adjusting the compression of the first elastic component over a wide range.

[0070] As an optional implementation, the above-mentioned mandrel assembly also includes a mandrel seat 32, which is connected to the lower punch seat 20 via a connecting post 321, and the second drive member 31 is mounted on the mandrel seat 32.

[0071] Specifically, a limiting frame 322 is provided on the mandrel holder 32, and a through hole is provided on the limiting frame 322. The bottom end of the mandrel 30 passes through the through hole and is connected to the driving end of the second driving member 31. A third limiting member 302 and a fourth limiting member 303 are provided at the bottom end of the mandrel 30. The third limiting member 302 and the fourth limiting member 303 are spaced apart in the height direction of the mandrel 30 and are located above and below the limiting frame 322, respectively.

[0072] In this way, the second drive component 31 can be assembled based on the mandrel seat 32, and the limiting frame 322 on the mandrel seat 32 can abut against the third limiting member 302 and the fourth limiting member 303 of the mandrel 30 respectively. When the mandrel 30 moves upward to a certain position, the fourth limiting member 303 can abut against the lower part of the limiting frame 322. When the mandrel 30 moves downward to a certain position, the third limiting member 302 can abut against the upper part of the limiting member. In this way, the third limiting member 302 and the fourth limiting member 303 control the movement stroke of the mandrel 30, preventing the mandrel 30 from moving upward too much and damaging the workpiece, and also preventing the mandrel 30 from moving downward too much and disengaging from the lower punch 21.

[0073] It should be noted that the second limiting member 132, the third limiting member 302, the fourth limiting member 303, and the threaded member mentioned above can all be selected as nut structures or threaded sleeve structures in related technologies.

[0074] As an optional implementation, the second driving component 31 includes a driving cylinder. The cylinder body of the driving cylinder is connected to the mandrel seat 32, and the movable rod of the driving cylinder is connected to the lower end of the mandrel 30. In this way, the piston rod of the driving cylinder can drive the mandrel 30 to move up and down. Since the piston rod of the driving cylinder is driven by gas, the driving force is relatively gentle and it is not easy to damage the workpiece.

[0075] Of course, both the first driving component and the second driving component 31 can be other driving structures in the prior art, such as linear motion output structures such as driving hydraulic cylinders or electric cylinders.

[0076] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A forming mold for a spherical workpiece, characterized in that, include, The upper punch assembly includes an upper punch base, an upper punch head, and a first driving member. The upper punch head is mounted on the upper punch base and can move up and down. The lower end of the upper punch head is provided with a first arc-shaped cavity. The first driving member is used to drive the upper punch head to move up and down. The lower punch assembly includes a lower punch base and a lower punch head. The lower punch head is mounted on the lower punch base and can move up and down. A forming cavity is provided at the upper end of the lower punch head. The middle mold assembly includes a middle mold base, which passes through the molding cavity and can move up and down. The middle mold base is provided with a second arc-shaped cavity segment, which is correspondingly provided with the first arc-shaped cavity segment. The mandrel assembly includes a mandrel and a second driving member. The mandrel passes through the molding cavity and can move up and down. The mandrel is provided with a molding section, which is movably connected to the second arc-shaped cavity section. The second driving member is used to drive the mandrel to move up and down. The outer surface of the molding section is provided with a guide surface.

2. The forming mold for a spherical workpiece according to claim 1, characterized in that, The lower punch assembly further includes an adjusting seat, a supporting seat, a lower punch pad, and a first elastic component. The adjusting seat is connected to the lower punch base. The outer wall of the supporting seat is provided with a first threaded section. The adjusting seat is provided with a threaded connector and a through hole. The supporting seat is movably connected to the through hole and threadedly connected to the threaded connector through the first threaded section. The lower punch pad is connected to the upper punch head through an adjusting rod. The adjusting rod is connected to the lower punch pad and drives the lower punch pad to move upward. The upper end of the first elastic component abuts against the lower punch pad, and the lower end of the first elastic component abuts against the supporting seat. The lower punch head is connected to the upper end of the lower punch pad. A first guide is provided outside the support base, and a second guide is provided inside the through hole; the second guide slides up and down with the first guide.

3. The forming mold for a spherical workpiece according to claim 2, characterized in that, The first threaded segment is externally threaded and connected to a first limiting member; the lower end of the first elastic member abuts against the first limiting member.

4. The forming mold for a spherical workpiece according to claim 2, characterized in that, The molding cavity is provided with a first limiting step and a second elastic component. The middle mold base is located above the first limiting step. The lower end of the lower punch is provided with a second limiting step. The upper end of the second elastic component abuts against the lower end of the middle mold base, and the lower end of the second elastic component abuts against the second limiting step.

5. The forming mold for a spherical workpiece according to claim 4, characterized in that, The upper punch is provided with an upper punch bracket, the upper end of the adjusting rod is connected to the upper punch bracket, the lower end of the adjusting rod is movably connected to the lower punch pad, and the lower end of the adjusting rod is provided with a second limiting member.

6. The forming mold for a spherical workpiece according to claim 5, characterized in that, The lower end of the adjusting rod is provided with a second threaded section, and the second threaded section is externally threaded to the second limiting member.

7. The forming mold for a spherical workpiece according to claim 4, characterized in that, The molding cavity is provided with an upper middle mold sleeve and a lower middle mold sleeve, both of which are inserted into and fixedly disposed within the molding cavity; the inner wall of the upper middle mold sleeve is provided with a lubrication groove, which extends along the height direction of the upper middle mold sleeve; the first limiting step is disposed on the inner wall of the lower middle mold sleeve.

8. The forming mold for a spherical workpiece according to claim 2, characterized in that, The first guide includes a guide groove that extends along the height direction of the support; the second guide includes a guide post that slides in conjunction with the guide groove.

9. The forming mold for a spherical workpiece according to any one of claims 1-8, characterized in that, The mandrel assembly further includes a mandrel seat, which is connected to the lower punch holder via a connecting post, and the second drive member is mounted on the mandrel seat; The mandrel base is provided with a limiting frame; the limiting frame is provided with a through hole; the bottom end of the mandrel passes through the through hole and is connected to the driving end of the second driving member; the bottom end of the mandrel is provided with a third limiting member and a fourth limiting member, the third limiting member and the fourth limiting member are spaced apart in the height direction of the mandrel, and are respectively located above and below the limiting frame.

10. The forming mold for a spherical workpiece according to claim 9, characterized in that, The second driving component includes a driving cylinder, the cylinder body of which is connected to the mandrel seat, and the movable rod of which is connected to the lower end of the mandrel.

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