A blank drawing stretch die structure

Abstract

The utility model relates to the technical field of cage processing mould discloses a blanking stretch die structure, the lower mould includes the support cylinder, its top connects blanking concave mould, and the blanking concave mould center is equipped with the round opening, and the support cylinder inside is equipped with the stretch male die, and the stretch male die top end extends to the round opening position department, and the stretch male die top end position is equipped with the punching positioning concave mould, the upper mould includes the mouth concave mould, and the mouth concave mould bottom opening and present the cylinder structure, and the mouth concave mould inside is equipped with the punch, and the mouth concave mould drops and passes through the pass between the stretch male die and blanking concave mould and enters the support cylinder, realizes the blanking punch of material band, and the punch punch material band realizes the punching step, and the punching that forms is used for the positioning when subsequent process processing, can guarantee the processing quality and processing accuracy of small -size bearing cage, reduces the rate of defective products.

Description

Technical Field

[0001] This utility model relates to the field of cage processing mold technology, and in particular to a blanking and stretching mold structure. Background Technology

[0002] The bearing cage is an important component of a bearing. Its main function is to isolate the rolling elements, maintain their even distribution, and prevent them from rubbing against each other, colliding, or moving erratically, thereby ensuring the normal operation and performance of the bearing. During bearing operation, the cage is subjected to complex stresses, including centrifugal force, inertial force, impact force from the rolling elements, and frictional force with the rolling elements and raceways.

[0003] The common processing route for bearing cages is as follows: blanking—stretching—undercutting—punching—edge turning—beveling—surface treatment—cleaning—rust prevention—packaging. Some molds integrate the stretching and undercutting functions of bearing cages into a single mold. The circular plate-shaped cage is fed into the mold, and the punch and die process the circular plate structure, achieving the undercutting step simultaneously with the first stretching step after blanking. Then, a punching die is used to punch holes in the workpiece. However, this processing method is more suitable for large-sized bearing cages. For small-sized bearing cages, if undercutting is done directly during stretching, the workpiece's overall structural strength is insufficient due to the undercutting, and the lack of a positioning structure makes the workpiece prone to deformation in subsequent processes, resulting in a high defect rate. Therefore, existing stretching and undercutting dies are not suitable for processing small-sized bearing cages. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a blanking and stretching die structure that can ensure the processing quality and accuracy of small-sized bearing cages and reduce the defect rate.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A blanking and stretching die structure, comprising:

[0007] The lower die includes a support cylinder, the top of which is connected to the blanking die. The blanking die has a circular opening at its center. The support cylinder has a stretching punch inside, the top of which extends to the circular opening. The top of the stretching punch has a punching positioning die.

[0008] The upper die includes a closing die, which has an open bottom and a cylindrical structure. A punch is provided on the inner side of the closing die. The closing die descends and enters the support cylinder through the channel between the stretching punch and the blanking die, so that the material strip is blanked and stamped at the same time. The punch stamps the material strip to achieve the punching step. The punched holes are used for positioning during subsequent processing.

[0009] As a further implementation, the upper mold includes an upper mold base, an upper template, an upper backing plate, a punch fixing plate, and a closing die, which are fixedly connected from top to bottom. The upper mold base can drive the closing die to rise and fall.

[0010] As a further implementation, the lower mold includes a lower mold base, a lower template, a support cylinder, and a blanking die, which are fixedly connected from bottom to top.

[0011] As a further implementation, the inner side shape of the closing die near the bottom end is adapted to the outer side shape of the retainer, and the outer diameter of the bottom end of the closing die is adapted to the inner diameter of the circular opening of the blanking die, so as to punch the workpiece off the strip.

[0012] As a further implementation, the punch fixing plate is provided with a vertically arranged punch, the top of the punch being connected to the punch fixing plate; an upper pressure sleeve is provided between the periphery of the punch and the closing die, and the upper pressure sleeve can slide relative to the closing die.

[0013] As a further implementation, the upper die is provided with a pressing mechanism, which includes an upper ejector rod that passes through the upper pad and the punch fixing plate and contacts the upper pressing sleeve. The upper ejector rod pushes the upper pressing sleeve downward relative to the closing die to achieve pressing. The top of the upper ejector rod is connected to a vertical pushing unit that can extend and retract within the upper die.

[0014] As a further implementation, the top of the stretching punch is provided with a groove, and a shim and a punching positioning die are installed in the groove from bottom to top. The overall outer diameter of the top of the stretching punch and the punching positioning die is adapted to the inner shape of the cage. The shim and the punching positioning die are provided with through holes at the corresponding punch positions to form a blanking channel.

[0015] As a further implementation, blanking channels are provided on the inner side of the stretching punch and the inner side of the lower die holder and lower template respectively.

[0016] As a further implementation, the stretching punch is provided with a lower ejector sleeve on its periphery, and a liftable lower ejector rod is provided in the lower die base. The top end of the lower ejector rod extends into the support cylinder and abuts against the lower ejector sleeve. The lower ejector rod pushes the lower ejector sleeve to rise, ejecting the stretched workpiece to the top surface of the unloading die.

[0017] As a further implementation, the upper end of the lower ejector sleeve is annular and can pass through the space between the stretching punch and the blanking die.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. The mold of this utility model can be applied to the stretching of circular sheet raw materials, as well as the blanking and stretching of strip materials. The closing die descends and enters between the blanking die and the stretching punch, cutting off a set of circular sheet materials from the strip. This achieves the stretching step of the material while the strip is being cut. At the same time, the punch is used to punch a positioning hole at the bottom of the cage, which is convenient for subsequent processing steps to use for positioning. This structure is particularly suitable for the processing of small-sized bearing cages. The bottom cutting work can be placed in a later step. In the process before bottom cutting, the positioning function of the positioning hole can be used to complete the punching, beveling, and other processes of the cage, which can ensure the processing quality and accuracy of small-sized bearing cages and reduce the defect rate.

[0020] 2. The upper pressure sleeve of this utility model can prevent the workpiece from getting stuck in the closing die when the upper die is withdrawn, and the lower ejector sleeve can eject the stretched workpiece. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0022] Figure 1 This is a cross-sectional view of the blanking and stretching die structure in an embodiment of this utility model;

[0023] Figure 2 This is an isometric view of the material feeding and stretching die structure in an embodiment of this utility model.

[0024] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0025] The components are: 11. Upper die base, 12. Upper template, 13. Upper backing plate, 14. Punch fixing plate, 15. Gathering die, 16. Punch, 161. First blanking channel, 211. Second blanking channel; 21. Lower die base, 22. Lower template, 23. Support cylinder, 24. Blanking die, 25. Drawing punch, 26. Shim, 27. Punching positioning die; 31. Ejector pin, 32. Upper ejector plate, 33. Upper ejector rod, 34. Upper pressure sleeve; 41. Screw, 42. Lower ejector plate, 43. Lower ejector rod, 44. Lower ejector sleeve. Detailed Implementation

[0026] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0027] Example 1

[0028] In a typical embodiment of this utility model, refer to Figures 1-2 As shown, a blanking and stretching die structure includes an upper die and a lower die. The upper die structure includes an upper die base 11, an upper template 12, an upper backing plate 13, a punch fixing plate 14, a closing die 15, and a punch 16. The lower die structure includes a lower die base 21, a lower template 22, a support cylinder 23, a blanking die 24, a stretching punch 25, a shim 26, and a punching positioning die 27.

[0029] like Figure 1 and Figure 2 As shown, the lower mold includes a lower mold base 21, a lower template 22, a support cylinder 23, and a blanking die 24, which are fixedly connected from bottom to top.

[0030] The lower mold base 21 is a support structure, and its top is fixed to the lower template 22 by fixing bolts. The lower template 22 is a circular plate structure. The support cylinder 23 is a cylindrical structure, with its bottom end fixed to the lower template 22 and its top end fixed with the blanking die 24.

[0031] Both the blanking die 24 and the support cylinder 23 have circular cross-sections and the same outer diameter. The blanking die 24 is a ring-shaped plate structure with a circular opening at its center. Its inner radius is smaller than the inner diameter of the support cylinder 23.

[0032] like Figure 1 As shown, the support cylinder is provided with a stretching punch 25. The stretching punch 25 is a cylindrical structure, and its bottom end is flush with the bottom end of the support cylinder 23. The stretching punch 25 is fixed on the lower template 22 and is coaxially arranged with the support cylinder 23.

[0033] The top center of the stretching punch 24 has a circular groove. A shim and a punching positioning die are installed in the groove from bottom to top. The top surface of the punching positioning die 27 after installation is flush with the top surface of the stretching punch 25. The top surface of the punching positioning die 27 is used to support the loading part, i.e., the strip or round sheet raw material.

[0034] like Figure 1 As shown, the overall outer diameter of the top of the stretching punch and the punching positioning die is adapted to the inner shape of the cage. The top of the stretching punch 25 is set to a frustum shape to adapt to the inner shape of the cage, so as to facilitate the stamping of a cage of the corresponding shape.

[0035] The shim 26 and the punching positioning die 27 are provided with circular through holes at corresponding positions, which serve as blanking channels.

[0036] like Figure 1 and Figure 2 As shown, blanking channels are also provided at corresponding positions inside the stretching punch 25, the lower die holder 21, and the lower template 22. The blanking channel inside the stretching punch 25 is the first blanking channel, and the blanking channel on the lower die holder 21 is the second blanking channel 211.

[0037] With the setting of the blanking channel, when the punch on the upper die presses the strip downward, it can punch out the positioning hole on the bottom surface of the stretched cage (which has a bottom surface when the bottom is not cut). The punch can pass through the raw material and enter the through hole of the punching positioning die 27. The round scrap material that is punched down falls from the blanking channel through the shim 26, the stretching punch 25, the lower die plate 22, and the lower die base 21 into the scrap collection box placed under the lower die base 21. The scrap collection box is existing technology.

[0038] The outer diameter of the top of the drawing punch 25 is smaller than the inner radius of the blanking die 24. The top of the drawing punch extends to the circular opening position, forming an annular space between them. This allows the upper die's closing die 15 to pass through this annular space and enter the support cylinder 23 when it punches downwards. Figure 1 As shown.

[0039] like Figure 1 As shown, the lower ejector sleeve 44 is slidably sleeved in the stretching punch 25 and located inside the support cylinder 23, and it is installed on the lower template.

[0040] The lower ejector sleeve 44 includes two continuous annular structures, the outer diameter of the upper annular structure is smaller than the inner diameter of the circular opening of the blanking die, and the thickness is the same as the thickness of the blanking die. The outer diameter of the lower annular structure is matched with the inner diameter of the support cylinder.

[0041] When the lower ejector sleeve 44 rises to its highest position, the top of the upper annular structure is flush with the top of the blanking die, so as to eject the stretched workpiece to the top surface of the blanking die, and the top surface of the lower annular structure abuts against the bottom surface of the blanking die 24.

[0042] The lower mold base 21 is provided with a liftable lower ejector rod 43. The top end of the lower ejector rod 43 passes through the lower mold plate 22 and extends into the support cylinder 23 to abut against the lower ejector sleeve 44. The lower ejector rod 43 pushes the lower ejector sleeve 44 to rise, ejecting the stretched workpiece to the top surface of the unloading die.

[0043] like Figure 1 As shown, the lower end of the ejector rod 43 is located below the lower mold base 21 and is connected to the ejector plate 42. The ejector plate 42 is also threadedly connected to the screw 41. The top end of the screw 41 is rotatably connected to the lower mold base 21 through a bearing, and the lower end of the screw 41 is connected to the drive motor.

[0044] The drive motor and the unloading top plate 42 are arranged inside the machine tool worktable. The lower die base 21 is set on the worktable. The drive motor drives the screw to rotate, so that the unloading top plate 42 drives the lower ejector rod 43 to rise. The lower ejector rod 43 pushes the lower ejector sleeve 44 to rise, and ejects the stretched workpiece to the top surface of the unloading die 24.

[0045] like Figure 1As shown, the upper mold includes an upper mold base 11, with an upper template 12 fixed below it. An upper pad 13 is fixed to the bottom of the upper template 12, a punch fixing plate 14 is fixed to the bottom of the upper pad 13, and a closing die 15 is fixed to the bottom of the punch fixing plate 14.

[0046] The concave die has an open bottom and a cylindrical structure. The tops of the two sets of punches are fixed on the punch fixing plate 14. The main body is inside the concave die. When the upper die is pressed down, the bottom of the punch 16 is lower than the top surface of the blanking die, so as to punch out a round hole in the raw material on the top surface of the blanking die, which serves as a positioning hole to facilitate positioning in subsequent processes and improve processing accuracy.

[0047] The inner side shape of the closing die 15 near the bottom end is adapted to the outer side shape of the cage, and the outer diameter of the bottom end of the closing die is adapted to the inner diameter of the circular opening of the blanking die, so as to punch the workpiece off the strip.

[0048] like Figure 1 and Figure 2 As shown, an upper pressure sleeve 34 is provided between the periphery of the punch 16 and the closing die 15, and the upper pressure sleeve 34 can slide relative to the closing die 15.

[0049] The upper pressure sleeve 34 has a ring-shaped structure, and its outer diameter is adapted to the inner diameter of the corresponding position of the closing die 15. It has an annular protrusion at its top, and correspondingly, there is an annular step at the top of the inner side of the closing die 15. The annular protrusion of the upper pressure sleeve 34 can slide between the annular step and the top of the closing die.

[0050] like Figure 1 As shown, the upper die is pressed into place. At this time, the top of the upper pressure sleeve 34 slides to the bottom of the punch fixing plate, and the bottom of the upper pressure sleeve 34 presses the material strip tightly.

[0051] In this embodiment, the closing die descends and enters the support cylinder through the channel between the stretching punch and the blanking die, realizing the blanking and stamping of the strip while the punch punches the strip to achieve the punching step. The formed punch is used for positioning during subsequent processing.

[0052] like Figure 1 As shown, the upper mold is equipped with a pressing mechanism, which includes a push rod 31. The upper end of the push rod is higher than the upper mold base 11, and the lower end passes through the upper mold base 11. The upper mold plate 12 has an annular cavity at its center, and the lower end of the push rod 31 can move vertically within the annular cavity. An upper ejector plate 32 is provided in the annular cavity, and the lower end of the push rod 31 is connected to the upper ejector plate 32. The outer diameter of the upper ejector plate 32 is larger than the outer diameter of the push rod 31, allowing the upper ejector plate 32 to slide up and down within the annular cavity of the upper mold plate 12.

[0053] The lower end face of the upper ejector plate 32 is connected to the upper ejector rod, and the upper ejector rod 33 extends through the upper pad plate 13 and the punch fixing plate 14 to the end of the die 15 and contacts the upper pressure sleeve 34.

[0054] When the upper die moves upward after stamping, the top of the ejector rod 31 is connected to a telescopic mechanism, such as a cylinder. The cylinder is located inside the machine tool's worktable. It pushes the upper pressure sleeve 34 downward relative to the closing die 15 through the ejector rod 31, the upper ejector plate 32, and the upper ejector rod 33 until the annular protrusion abuts against the step on the inner side of the closing die 15. The upper ejector rod then pushes the upper pressure sleeve downward relative to the closing die to achieve material pressing. This process ensures that when the upper die moves upward, the stretched workpiece will not accidentally get stuck inside the closing die 15, so that after the upper die leaves, the stretched workpiece remains at the top of the stretching punch 25. The subsequent process is that the lower ejector sleeve 44 ejects the stretched workpiece.

[0055] The mold in this embodiment is applicable to the stretching of circular sheet raw materials, as well as the blanking and stretching of strip materials. The closing die descends and enters between the blanking die and the stretching punch, cutting off a set of circular sheet materials from the strip. This achieves the stretching step of the material while the strip is being cut. At the same time, the punch is used to punch a positioning hole at the bottom of the cage, which is convenient for subsequent processing steps to use for positioning. This structure is particularly suitable for processing small-sized bearing cages. The bottom cutting work can be placed in a later step. In the process before bottom cutting, the positioning function of the positioning hole can be used to complete the punching, beveling, and other processes of the cage, which can ensure the processing quality and accuracy of small-sized bearing cages and reduce the defect rate.

[0056] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A blanking and stretching die structure, characterized in that, include: The lower die includes a support cylinder, the top of which is connected to the blanking die. The blanking die has a circular opening at its center. The support cylinder has a stretching punch inside, the top of which extends to the circular opening. The top of the stretching punch has a punching positioning die. The upper die includes a closing die, which has an open bottom and a cylindrical structure. A punch is provided on the inner side of the closing die. The closing die descends and enters the support cylinder through the channel between the stretching punch and the blanking die, so that the material strip is blanked and stamped at the same time. The punch stamps the material strip to achieve the punching step. The punched holes are used for positioning during subsequent processing.

2. The blanking and stretching die structure according to claim 1, characterized in that, The upper mold includes an upper mold base, an upper template, an upper backing plate, a punch fixing plate, and a closing die, which are fixedly connected from top to bottom. The upper mold base can drive the closing die to rise and fall.

3. The blanking and stretching die structure according to claim 1, characterized in that, The lower mold includes a lower mold base, a lower mold plate, a support cylinder, and a blanking die, which are fixedly connected from bottom to top.

4. The blanking and stretching die structure according to claim 2, characterized in that, The inner side shape of the closing die near the bottom end is adapted to the outer side shape of the cage, and the outer diameter of the bottom end of the closing die is adapted to the inner diameter of the circular opening of the blanking die, so as to punch the workpiece off the strip.

5. The blanking and stretching die structure according to claim 2, characterized in that, The punch fixing plate is provided with vertically arranged punches, the top of which is connected to the punch fixing plate; an upper pressure sleeve is provided between the punch periphery and the closing die, and the upper pressure sleeve can slide relative to the closing die.

6. The blanking and stretching die structure according to claim 5, characterized in that, The upper mold is equipped with a pressing mechanism, which includes an upper ejector rod that passes through the upper pad and the punch fixing plate and contacts the upper pressing sleeve. The upper ejector rod pushes the upper pressing sleeve downward relative to the closing die to achieve pressing. The top of the upper ejector rod is connected to a vertical pushing unit that can extend and retract within the upper mold.

7. The blanking and stretching die structure according to claim 3, characterized in that, The top of the stretching punch is provided with a groove, and a shim and a punching positioning die are installed in the groove from bottom to top. The overall outer diameter of the top of the stretching punch and the punching positioning die is adapted to the inner shape of the cage. The shim and the punching positioning die are provided with through holes at the corresponding punch positions to form a material discharge channel.

8. The blanking and stretching die structure according to claim 7, characterized in that, The inner side of the stretching punch and the inner side of the lower die base and lower template are respectively provided with blanking channels.

9. The blanking and stretching die structure according to claim 8, characterized in that, The stretching punch is provided with a lower ejector sleeve on its periphery, and a liftable lower ejector rod is provided in the lower die base. The top of the lower ejector rod extends into the support cylinder and abuts against the lower ejector sleeve. The lower ejector rod pushes the lower ejector sleeve to rise, ejecting the stretched workpiece to the top surface of the unloading die.

10. The blanking and stretching die structure according to claim 9, characterized in that, The upper end of the lower ejector sleeve is circular and can pass through the space between the stretching punch and the blanking die.

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