Shaping die for spherical workpiece

Abstract

The shaping die comprises an upper stamping die assembly, a lower stamping die assembly, a lower stamping die assembly and a first driving part, the upper stamping die assembly comprises an upper stamping die base, an upper punch and a first driving part, and the upper punch is installed on the upper stamping die base and can move up and down; a first arc-shaped cavity section is arranged at the lower end of the upper punch; the lower punching die assembly comprises a lower punching die base and a lower punch, and the lower punch is installed on the lower punching die base and can move up and down; a forming cavity is formed in the upper end of the lower punch; the middle mold assembly comprises a middle mold base, the middle mold base is connected to the forming cavity in a penetrating mode and can move up and down, the middle mold base is provided with a second arc-shaped cavity section, and the second arc-shaped cavity section and the first arc-shaped cavity section are arranged correspondingly; the core rod assembly comprises a core rod and a second driving piece, and the core rod is connected to the forming cavity in a penetrating mode and can move up and down; the core rod is provided with a forming section, and the forming section is movably connected to the second arc-shaped cavity section in a penetrating mode. A guide face is arranged on the outer surface of the forming section. During shaping, a workpiece can be positioned and guided by the forming section, so that the condition that the workpiece is damaged when the upper punch is downwards shaped is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, in particular to a shaping mold for a spherical workpiece. Background Art

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

[0003] In the existing shaping mold, the core rod structure is connected to the upper punch mold. During shaping, the workpiece to be shaped is placed in the shaping cavity of the lower punch die seat, and the upper punch mold moves downward. The core rod needs to be extended into the hole of the workpiece. During this process, it is not easy for the core rod to align with the middle hole position of the workpiece when it descends. Therefore, it is easy to damage the workpiece during the descending process, resulting in a low workpiece yield rate. Summary of the Invention

[0004] In order to overcome at least one of the defects of the above-mentioned prior art, the present invention provides a shaping die for a spherical workpiece, wherein the workpiece can be positioned and guided by the forming section during shaping, thereby reducing the situation where the upper punch damages the workpiece when shaping downward.

[0005] The technical solution adopted by the present invention to solve the problem is: A shaping die for a spherical workpiece, comprising: The upper punch assembly includes an upper punch base, an upper punch, and a first driving member. The upper punch is mounted on the upper punch base and can move up and down. A first arc-shaped cavity section is provided at the lower end of the upper punch. The first driving member is used to drive the upper punch to move up and down. The lower punch assembly includes a lower punch base and a lower punch. The lower punch is mounted on the lower punch base and can move up and down. The upper end of the lower punch is provided with a forming cavity. A middle mold assembly includes a middle mold base, the middle mold base is connected to the molding cavity and can move up and down, the middle mold base is provided with a second arc-shaped cavity segment, and the second arc-shaped cavity segment is provided corresponding to the first arc-shaped cavity segment; The core rod assembly includes a core rod and a second driving member. The core rod is connected to the forming cavity and can move up and down. The core rod is provided with a forming section, and the forming section is movably connected to the second arc-shaped cavity section. The second driving member is used to drive the core rod to move up and down. The outer surface of the forming section is provided with a guide surface.

[0006] As an optional embodiment, the lower punch assembly further includes an adjusting seat, a supporting seat, a lower punch plate and a first elastic component, the adjusting seat being connected to the lower punch seat, the outer wall of the supporting seat being provided with a first threaded section, the adjusting seat being provided with a threaded connection piece and a through-hole, the supporting seat being movably connected to the through-hole and being threadedly connected to the threaded connection piece through the first threaded section; the lower punch plate is connected to the upper punch through an adjusting rod, the adjusting rod is connected to the lower punch plate and drives the lower punch plate to move upward; the upper end of the first elastic component abuts against the lower punch plate, and the lower end of the first elastic component abuts against the supporting seat; the lower punch is connected to the upper end of the lower punch plate; A first guide member is provided outside the support seat, and a second guide member is provided inside the through hole; the second guide member is slidably matched with the first guide member up and down.

[0007] As an optional implementation, the first threaded section is externally threadedly connected to a first limiting member; the lower end of the first elastic component abuts against the first limiting member.

[0008] As an optional embodiment, a first limiting step and a second elastic component are provided in the forming cavity, and the middle die base is provided above the first limiting step; a second limiting step is provided at the lower end of the lower punch; the upper end of the second elastic component abuts against the lower end of the middle die base, and the lower end of the second elastic component abuts against the second limiting step.

[0009] As an optional embodiment, 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 limit member.

[0010] As an optional implementation, a second threaded section is provided at the lower end of the adjusting rod, and the second threaded section is externally threadedly connected to a second limiting member.

[0011] As an optional embodiment, a middle mold upper sleeve and a middle mold lower sleeve are provided in the molding cavity, and the middle mold upper sleeve and the middle mold lower sleeve are both connected and fixed in the molding cavity; the inner wall of the middle mold upper sleeve is provided with a lubrication groove, and the lubrication groove extends along the height direction of the middle mold upper sleeve; the first limiting step is provided on the inner wall of the middle mold lower sleeve.

[0012] As an optional embodiment, the first guide member includes a guide groove, which extends along the height direction of the support seat; the second guide member includes a guide column, which is slidably engaged with the guide groove.

[0013] As an optional embodiment, the mandrel assembly further includes a mandrel seat, the mandrel seat is connected to the lower punch seat via a connecting column, and the second driving member is installed on the mandrel seat; A limiting frame is provided on the core rod seat; a through hole is provided on the limiting frame; the bottom end of the core rod passes through the through hole and is connected to the driving end of the second driving member; a third limiting member and a fourth limiting member are provided at the bottom end of the core rod, and the third limiting member and the fourth limiting member are spaced apart in the height direction of the core rod, and are respectively located above and below the limiting frame.

[0014] As an optional embodiment, the second driving member includes a driving cylinder, a cylinder body of the driving cylinder is connected to the core rod seat, and a movable rod of the driving cylinder is connected to the lower end of the core rod.

[0015] In summary, the present invention has the following technical effects: 1. When the workpiece is placed, the forming section of the mandrel can be used as the positioning axis, and the forming section of the mandrel is inserted into the middle hole of the workpiece. Since the outer wall of the forming section is provided with a guide surface, during the process of the workpiece penetrating, the guide surface can guide the workpiece and the mandrel to maintain coaxial assembly, thereby reducing the situation where the workpiece is crushed during the shaping process.

[0016] / 2. During the downward pressing process of the upper punch, the lower punch can adaptively move downward, so that the workpiece can be pressed downward into the second arc-shaped cavity segment under the pressure of the upper punch, and the core rod can always be guided and centered in the middle hole position of the workpiece during the downward pressing process, reducing the damage caused by the deviation of the workpiece during the downward pressing process. After the first arc-shaped cavity segment of the upper punch and the second arc-shaped cavity segment of the middle die base are matched, the upper and lower ends of the workpiece can be shaped upward and downward by the arc surfaces of the first arc-shaped cavity segment and the second arc-shaped cavity segment respectively, thereby completing the shaping action of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a cross-sectional schematic diagram of the present invention; Figure 3 Schematic diagram of the assembly structure of the upper punch, lower punch and middle die base of the present invention; Figure 4 A cross-sectional view of the assembly structure of the upper punch, the lower punch, and the middle die base of the present invention; Figure 5 It is a structural schematic diagram of the upper punch of the present invention; Figure 6 It is a structural schematic diagram of the lower punch of the present invention; Figure 7 It is a structural schematic diagram of the middle mold base of the present invention; Figure 8 It is a structural schematic diagram of the middle mold upper sleeve of the present invention.

[0019] The meanings of the reference numerals are as follows: 10, upper punch seat; 11, upper punch; 111, first arc-shaped cavity segment; 12, upper punch bracket; 13, adjusting rod; 131, second threaded segment; 132, second limiting member; 20, lower punch seat; 201, forming cavity; 202, second elastic member; 203, middle die upper sleeve; 204, middle die lower sleeve; 205, first limiting step; 206, lubrication groove; 21, lower punch; 211, second Limiting step; 22, adjusting seat; 221, threaded connector; 23, supporting seat; 231, first threaded segment; 232, first guide member; 233, first limiting member; 30, core rod; 301, forming segment; 302, third limiting member; 303, fourth limiting member; 304, guide surface; 31, second driving member; 32, core rod seat; 321, connecting column; 322, limiting frame; 40, middle mold seat; 401, second arc-shaped cavity segment. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] In the present invention, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe the present invention and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0022] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0023] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0024] Furthermore, the terms "first," "second," and the like are primarily used to distinguish different devices, elements, or components (which may or may not be the same in type and configuration) and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0025] The technical solution of the present invention will be further described below in conjunction with embodiments and drawings.

[0026] See Figures 1-8 The present invention discloses a shaping die for a spherical workpiece, comprising an upper die assembly, a lower die assembly, a middle die assembly and a core rod assembly. The upper die assembly comprises an upper die base 10, an upper punch 11 and a first driving member. The upper punch 11 is installed on the upper die 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.

[0027] 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 connected to the forming cavity 201 and can move up and down within the forming cavity 201. The middle die base 40 is provided with a second arcuate cavity segment 401, which is arranged corresponding to the first arcuate cavity segment 111.

[0028] The specific core rod assembly includes a core rod 30 and a second driving member 31, and the core rod 30 is connected to the forming cavity 201. The core rod 30 can move up and down under the drive of the second driving member 31. The core rod 30 is provided with a forming section 301, and the forming section 301 is movably connected to the second arc-shaped cavity section 401.

[0029] On the basis of the above structure, when using the shaping die of the spherical workpiece of the present invention, In the initial state, the middle die base 40 can move upward, and the end face of the middle die base 40 can be flush with the end face of the lower punch die group. 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 die base 40, and the forming section 301 of the core rod 30, driven by the second driving member 31, moves upward until it passes through the lower punch 21 and extends upward.

[0030] In this way, when the workpiece is placed, the forming section 301 of the core rod 30 can be used as the positioning axis, and the forming section 301 of the core rod 30 can be inserted into the middle hole of the workpiece. Since the outer wall of the forming section 301 is provided with a guide surface 304, during the process of the workpiece penetrating, the guide surface 304 can guide the workpiece and the core rod 30 to maintain coaxial assembly, and the top surface of the lower punch 21 is supported to the lower end surface of the workpiece.

[0031] It should be noted that the guide surface 304 can be a bevel or arc surface as known in the art. When the inner wall of the workpiece's perforation contacts the bevel or arc surface, for example, the inner wall of the workpiece's perforation, after being deflected, aligns with the bevel. Since the workpiece needs to move downward, the workpiece can be guided in a straight line by adjusting the normal direction of the bevel. When the guide surface 304 is an arc surface, when the perforation of the workpiece deflects and contacts the arc surface, the change in the tangent direction of the arc is utilized to guide the object to rotate about the center or axis of the arc surface, correcting angular deviations and ultimately aligning the object's axis with the center of the arc surface, thereby also achieving axial guidance of the workpiece.

[0032] Afterwards, the upper punch 11 is driven downward by the first driving member. When the upper punch 11 moves downward, the first arc-shaped cavity section 111 of the upper punch 11 can be inserted into the upper end of the workpiece, and the first driving member drives the upper punch 11 to continuously press downward, and the inner wall of the first arc-shaped cavity section 111 of the upper punch 11 can perform arc surface shaping on the outer wall of the upper end of the workpiece. And during the downward pressing process of the upper punch 11, the lower punch 21 can adaptively move downward, so that the workpiece can be pressed downward into the second arc-shaped cavity segment 401 under the pressure of the upper punch 11, and during the downward movement of the workpiece, the core rod 30 can always be guided and centered in the middle hole position of the workpiece, reducing the damage caused by the deviation of the workpiece during the downward pressing process. After the first arc-shaped cavity segment 111 of the upper punch 11 is matched with the second arc-shaped cavity segment 401 of the middle die base 40, the upper and lower ends of the workpiece can be shaped upward and downward by the arc surfaces of the first arc-shaped cavity segment 111 and the second arc-shaped cavity segment 401 respectively, completing the shaping action of the workpiece.

[0033] Of course, after the workpiece is shaped, it is necessary to remove the shaped workpiece. The lower punch 21 can move upward to push the workpiece in the second arc-shaped cavity section 401 upward, and at the same time, the core rod 30 can move downward to withdraw the workpiece, thereby achieving smooth demolding of the workpiece.

[0034] As an optional embodiment, the above-mentioned lower punch assembly also includes an adjusting seat 22, a support seat 23, a lower punch pad and a first elastic component, and the adjusting seat 22 is connected to the lower punch seat. A first threaded section 231 is provided on the outer wall of the support seat 23, and the adjusting seat 22 is provided with a threaded connector 221 and a through-hole. The above-mentioned 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.

[0035] The lower punch pad is connected to the upper punch 11 via an adjustment rod 13, and the adjustment rod 13 and the lower punch pad can be slidably assembled up and down. 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 seat 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 seat 23, and a second guide is provided in the through hole. The second guide slidably cooperates with the first guide 232 up and down.

[0036] On the basis of this structure, in the initial state, the support seat 23 is connected to the lower punch seat through the adjustment seat 22, that is, when the adjustment 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 component, the first elastic component is abutted against the lower punch pad, and the lower punch pad and the adjustment rod 13 have a sliding tendency. Therefore, under the action of the first elastic component, the lower punch pad has a tendency to move upward, that is, the lower punch 21 on the lower punch pad can maintain an upward state under the action of the first elastic component.

[0037] Then in the initial state, the first elastic component is clamped between the lower punch plate and the support seat 23, thereby providing elastic force to keep the lower punch 21 in an upward state. When the upper punch 11 moves downward, since the lower punch 21 is supported by the elastic stress provided by the first elastic component, when the upper punch 11 moves downward, the lower punch 21 will adaptively move downward, that is, the pressure exerted by the upper punch 11 on the workpiece will be applied to the lower punch 21, and the first elastic component will be matched. Since the workpiece is generally pressed and formed by powder metallurgy, if the upper punch 11 directly applies pressure to the workpiece and the lower punch 21 is in 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 must be larger, and the pressure is from top to bottom, so the force on the bottom of the workpiece is relatively small. Therefore, after the shaping of the workpiece is completed, the compaction density of the upper and lower parts is inconsistent.

[0038] In this embodiment, the lower punch 21 is supported by the elastic stress provided by the first elastic component. Compared with directly applying a hard force to the lower punch 21, the first elastic component can apply a reaction force to match the upper force after the upper punch 11 applies force to the upper end of the workpiece. In this way, the forces on the upper and lower ends of the workpiece are relatively balanced, and the density of the workpiece compacted up and down during the shaping process can be relatively consistent, so the quality of the workpiece shaping is higher.

[0039] In addition, due to the different sizes and types of workpieces, the force applied to the workpiece and the downward stroke of the upper punch 11 when it descends are also different. The corresponding position of the lower punch 21 extending into the second arc-shaped cavity section 401 and the retraction stroke will also be different. In this way, the support seat 23 can be rotated. Since the support seat 23 is threadedly assembled with the threaded part of the adjustment seat 22 through the first threaded section 231, and has a first guide member 232 and a second guide member that slide up and down, then during the rotation of the support seat 23, the support seat 23 can move up and down, so that the compression amount of the first elastic component arranged between the upper end of the support seat 23 and the lower punch pad can be adjusted. Since the compression amount 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, and it can be adjusted for workpieces of different types and sizes.

[0040] Of course, when the workpiece is demolded, since the lower punch pad 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 is demolded and separated from the upper end of the workpiece, and the upper punch 11 is connected to the lower punch pad through the adjusting rod 13. The adjusting rod 13 can drive the lower punch pad to move upward after the upper punch 11 moves upward, and push out the lower end of the workpiece to complete the demolding. In this way, the demolding of the upper end and the lower end of the workpiece can be completed by the first driving member driving the upper punch 11 upward, saving power resources.

[0041] As an optional embodiment, a first limiting member 233 can be externally threadedly connected to the first threaded section 231; the lower end of the first elastic member abuts against the first limiting member 233, and the first limiting member 233 can be a nut or a threaded sleeve structure. When adjusting the elastic compression amount of the first elastic member, the first threaded section 231 of the support seat 23 can be rotated as a whole relative to the adjustment seat 22 to realize the upward and downward movement of the support seat 23 relative to the adjustment seat 22, so as to adjust the position of the support seat 23 in a large range to achieve a large-scale adjustment of the compression amount of the first elastic member. After the position of the support seat 23 is adjusted to the right, the first limiting member 233 can be further rotated to adjust the height position of the first limiting member 233 on the support seat 23 by rotating the first limiting member 233 relative to the first threaded section 231, so as to adjust the compression amount of the first elastic member in a small range. In this way, the compression amount adjustment accuracy of the first elastic member is higher, which is suitable for adjusting the supporting force after a small change in the size of the workpiece.

[0042] As an optional embodiment, a first limiting step 205 and a second elastic component 202 may be provided in the molding cavity 201, and the middle die holder 40 is provided above the first limiting step 205. In addition, a second limiting step 211 is provided at the lower end of the lower punch 21, and the upper end of the second elastic component 202 abuts against the lower end of the middle die holder 40, while the lower end of the second elastic component 202 abuts against the second limiting step 211.

[0043] In this way, when the upper punch 11 moves downward, the first driving member continues to act on the upper punch 11 downward, and the second elastic member 202 keeps being gradually compressed and retracted under this action until it abuts against the first limit step 205, and the middle die base 40 no longer moves downward. In this process, the elastic stress provided by the second elastic member 202 can also rebound and react to apply force to the circumference of the lower end 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 circumferential forces on the upper and lower ends of the workpiece are relatively balanced, and the density of the workpiece compacted up and down during the shaping process can be relatively consistent, so the quality of the workpiece shaping is higher.

[0044] As an optional embodiment, an upper punch bracket 12 is provided on the upper punch 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 limit member 132 is provided at the lower end of the adjusting rod 13. 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.

[0045] After the workpiece shaping action is completed, the first driving member drives the upper punch bracket 12 to move upward, and at the same time drives the upper punch 11 connected to the upper punch bracket 12 to move upward, and the upper punch 11 can complete the demoulding action from above and the upper end of the workpiece. During this process of the upper punch bracket 12 moving upward, the adjusting rod 13 connected to the upper punch bracket 12 can slide upward relative to the lower punch pad. When it slides upward to the second limit member 132 and abuts against the lower end of the lower punch pad, the adjusting rod 13 can drive the lower punch pad upward together, and then drive the lower punch 21 on the lower punch pad to move upward, ejecting the workpiece in the second arc-shaped cavity section 401, and completing the demoulding of the workpiece.

[0046] Since the second limit member 132 maintains a certain distance between the upper punch 11 and the lower punch pad when the upper punch 11 just starts to move upward, that is to say, after the upper punch 11 moves upward to completely disengage from the upper end of the workpiece, the second limit member 132 of the adjusting rod 13 abuts against the lower punch pad, thereby driving the lower punch 21 upward to start the demolding action of the lower end of the workpiece, thereby preventing the workpiece from being damaged due to the lower punch 21 pushing up when the upper punch 11 is not completely disengaged from the upper end of the workpiece.

[0047] As an optional embodiment, a second threaded section 131 can be provided at the lower end of the adjusting rod 13, and the second threaded section 131 is externally threadedly connected to the above-mentioned second limit member 132. Since the second limit member 132 and the second threaded section 131 are assembled by threads, the position of the second limit member 132 on the adjusting rod 13 can be adjusted, that is, the stroke at which the lower punch 21 starts to demold can be adjusted, and the specific adaptive adjustment can be made according to the size and type of the product.

[0048] As an optional embodiment, a middle mold upper sleeve 203 and a middle mold lower sleeve 204 can be provided in the molding cavity 201. The above-mentioned middle mold upper sleeve 203 and middle mold lower sleeve 204 are both connected and fixed in the molding cavity 201. On the basis of this structure, the above-mentioned middle mold base 40 is provided in the molding space formed after the middle mold upper sleeve 203 and the middle mold lower sleeve 204 are assembled. Specifically, a lubrication groove 206 can be provided on the inner wall of the middle mold upper sleeve 203. The lubrication groove 206 extends along the height direction of the middle mold upper sleeve 203. Since the middle mold base 40 needs to adapt to the downward pressure of the upper punch 11 to slide downward during the molding process, when the middle mold base 40 slides with the middle mold upper sleeve 203, it can be lubricated with the lubricating oil added to the lubrication groove 206 to reduce the friction resistance between the middle mold base 40 and the middle mold upper sleeve 203 when it moves downward, so that the rebound force of the second elastic component 202 is adapted to the upper punch pressure, so that the upper and lower compaction densities are more easily kept consistent.

[0049] In addition, the above-mentioned first limiting step 205 is arranged on the inner wall of the middle mold lower sleeve 204, so that the first limiting step 205 can limit the downward position of the middle mold base 40. After the middle mold base 40 maintains contact with the first limiting step 205, it will no longer move downward and can maintain the compaction action at this position.

[0050] Of course, since the lubrication groove 206 and the first limiting step 205 are both based on the middle die upper sleeve 203 and the middle die lower sleeve 204, the middle die upper sleeve 203 and the middle die lower sleeve 204 can be processed separately and then assembled into the forming cavity 201 of the lower punch seat. Compared with directly processing the lubrication groove 206 and the first limiting step 205 in the forming cavity 201, the process is simpler.

[0051] As an optional embodiment, in this embodiment, the first guide member 232 includes a guide groove extending along the height direction of the support base 23; and the second guide member includes a guide post that slides in engagement with the guide groove. When adjusting the position of the support base 23, the first threaded segment 231 of the support base 23 can be rotated relative to the threaded member of the adjustment base 22. This allows the guide post to restrict the rotational movement of the support base 23 within the guide groove, thereby allowing the support base 23 to move up and down during the rotation process, thereby achieving position adjustment of the support base 23 and adjusting the compression of the first elastic component over a wide range.

[0052] As an optional embodiment, the mandrel assembly further includes a mandrel seat 32 , the mandrel seat 32 is connected to the lower punch seat 20 via a connecting column 321 , and the second driving member 31 is installed on the mandrel seat 32 ; Specifically, a limiting frame 322 is provided on the core rod seat 32, and a through hole is provided on the limiting frame 322. The bottom end of the above-mentioned core rod 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 core rod 30, and the third limiting member 302 and the fourth limiting member 303 are spaced apart in the height direction of the core rod 30, and are respectively located above and below the limiting frame 322.

[0053] In this way, the second driving member 31 can be assembled based on the core rod seat 32, and the limit frame 322 on the core rod seat 32 can respectively abut against the third limit member 302 and the fourth limit member 303 of the core rod 30. Then, when the core rod 30 moves upward to a certain position, the fourth limit member 303 can abut against the bottom of the limit frame 322, and when the core rod 30 moves downward to a certain position, the third limit member 302 can abut against the top of the limit member. In this way, the third limit member 302 and the fourth limit member 303 control the movement stroke of the core rod 30 to prevent the core rod 30 from moving upward too much and damaging the workpiece, and also to prevent the core rod 30 from moving downward too much and separating from the lower punch 21.

[0054] It should be noted that the second limiting member 132 , the third limiting member 302 , the fourth limiting member 303 and the threaded member can all be selected to be a nut structure or a threaded sleeve structure in the related art.

[0055] As an optional embodiment, the second driving member 31 includes a driving cylinder, the cylinder body of the driving cylinder is connected to the core rod seat 32, and the movable rod of the driving cylinder is connected to the lower end of the core rod 30. In this way, the core rod 30 can be driven up and down by the piston rod of the driving cylinder. Since the piston rod of the driving cylinder is driven by gas, the driving force is relatively smooth and it is not easy to damage the workpiece.

[0056] Of course, the first driving member and the second driving member 31 can both use other driving structures in the prior art, such as a linear motion output structure such as a driving cylinder or an electric cylinder.

[0057] The technical means disclosed in the solutions of the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

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

2. The shaping die for a spherical workpiece according to claim 1, wherein: The cam is connected to the upper punch seat by a first threaded section, and the cam is connected to the lower punch seat by a first threaded section. The cam is connected to the lower punch seat by a first threaded section. The cam is connected to the lower punch seat by a first threaded section. A first guide member is provided outside the support seat, and a second guide member is provided inside the through hole; the second guide member is slidably matched with the first guide member up and down.

3. The shaping die for a spherical workpiece according to claim 2, wherein: The first thread segment is externally threadedly connected to a first limiting member; the lower end of the first elastic member abuts against the first limiting member.

4. The shaping die for a spherical workpiece according to claim 2, wherein: A first limiting step and a second elastic component are provided in the forming cavity, and the middle die seat is provided above the first limiting step; a second limiting step is provided at the lower end of the lower punch; the upper end of the second elastic component abuts against the lower end of the middle die seat, and the lower end of the second elastic component abuts against the second limiting step.

5. The shaping die 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 limiter.

6. The shaping die for a spherical workpiece according to claim 5, characterized in that: A second threaded section is provided at the lower end of the adjusting rod, and the second threaded section is externally threadedly connected to the second limiting member.

7. The shaping die for a spherical workpiece according to claim 4, characterized in that: A middle mold upper sleeve and a middle mold lower sleeve are provided in the molding cavity, and the middle mold upper sleeve and the middle mold lower sleeve are both connected and fixed in the molding cavity; a lubrication groove is provided on the inner wall of the middle mold upper sleeve, and the lubrication groove extends along the height direction of the middle mold upper sleeve; the first limiting step is provided on the inner wall of the middle mold lower sleeve.

8. The shaping die for a spherical workpiece according to claim 2, wherein: The first guide member includes a guide groove, which extends along the height direction of the support seat; the second guide member includes a guide column, which is slidably matched with the guide groove.

9. The shaping die for a spherical workpiece according to any one of claims 1 to 8, characterized in that: The mandrel assembly further includes a mandrel seat, the mandrel seat being connected to the lower punch seat via a connecting column, and the second driving member being mounted on the mandrel seat; A limiting frame is provided on the core rod seat; a through hole is provided on the limiting frame; the bottom end of the core rod passes through the through hole and is connected to the driving end of the second driving member; a third limiting member and a fourth limiting member are provided at the bottom end of the core rod, and the third limiting member and the fourth limiting member are spaced apart in the height direction of the core rod, and are respectively located above and below the limiting frame.

10. The shaping die for a spherical workpiece according to claim 9, characterized in that: The second driving member includes a driving cylinder, a cylinder body of the driving cylinder is connected to the core rod seat, and a movable rod of the driving cylinder is connected to the lower end of the core rod.

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