Ejecting structure of lower die of press machine

Abstract

The utility model relates to a press machine lower die material ejecting structure which comprises a base plate and a material ejecting rod capable of penetrating through the middle of the base plate, a material ejecting through hole for the material ejecting rod to penetrate through is formed in the middle of the base plate, and the material ejecting through hole comprises an upper-section through hole, a middle-section through hole and a lower-section through hole which are sequentially formed from top to bottom. The upper-section through hole and the middle-section through hole are trumpet-shaped through holes of which the upper-end diameters are greater than the lower-end diameters; the ejector rod comprises a rod part and an ejector part fixed to the upper end of the rod part, and the ejector part is of an inverted-circular-truncated-cone-shaped structure with the upper end diameter larger than the lower end diameter. According to the utility model, the problem that the ejection rod is prevented from moving upwards due to deformation of the ejection through hole can be avoided, and the structural strength of the middle part of the base plate cannot be influenced.

Description

Technical Field

[0001] This utility model relates to the field of forging production technology, and in particular to a material ejection structure for the lower die of a press. Background Technology

[0002] A press is a sophisticated and versatile machine with wide applications and high production efficiency. It can be widely used in processes such as cutting, punching, blanking, bending, riveting, and forming. The press has a backing plate installed on its worktable, and the lower die is mounted on the backing plate. An ejector pin has a through-hole on the backing plate for the ejector rod to pass through. The ejector pin moves upward through the through-hole and contacts the lower die core, pushing it upward and pushing the workpiece out of the forming cavity. During operation, the lower die is subjected to impact force, which is transmitted to the backing plate. After a period of use, the middle part of the backing plate will deform and dent due to the impact force. The existing ejector pin is a vertical through-hole; this deformation and denting of the middle part of the backing plate will deform the ejector pin, causing the upper diameter of the ejector pin to decrease. This will hinder the upward movement of the ejector pin and affect the normal demolding of the workpiece.

[0003] Based on the above problems, the inventors proposed a lower die ejector structure for a press, which changes the original structure of the ejector through hole, thus avoiding the problem of obstruction when the ejector rod moves upward, without affecting the structural strength of the middle part of the pad. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a material ejection structure for the lower die of a press.

[0005] This utility model is achieved through the following technical solution: a material ejector structure for a lower die of a press is provided, including a pad and an ejector rod that can penetrate the middle of the pad. An ejector through hole is provided in the middle of the pad for the ejector rod to pass through. The ejector through hole includes an upper through hole, a middle through hole and a lower through hole arranged sequentially from top to bottom. The upper through hole and the middle through hole are both funnel-shaped through holes with an upper diameter greater than a lower diameter. The ejector rod includes a rod part and an ejector part fixed to the upper end of the rod part. The ejector part is an inverted frustum-shaped structure with an upper diameter greater than a lower diameter.

[0006] Preferably, the ejector part of the ejector rod is adapted to the middle section through hole. After the ejector rod is inserted into the ejector through hole, its ejector part is located in the middle section through hole. Its rod part passes through the lower section through hole and extends to the bottom of the pad and is connected to the drive mechanism. The drive mechanism drives the ejector rod to move up and down. The ejector rod moves up and down, and the ejector part moves out of the ejector through hole, pushing the lower mold core to move up. The lower mold core moves up and pushes the workpiece out of the forming groove to achieve workpiece demolding.

[0007] Preferably, the angle α between the slope of the upper through hole and the vertical direction is 5-7°.

[0008] Preferably, the angle β between the slope of the middle section of the through hole and the vertical direction is 30-35°.

[0009] The design of the upper and middle through holes effectively prevents the ejector pin from being obstructed by deformation of the ejector pin due to deformation and sinking of the backing plate caused by repeated forging. This ensures stable upward movement of the ejector pin and normal workpiece demolding. The segmented design of the upper and middle through holes, along with the controlled angle between their slopes and the vertical direction, not only avoids the ejector pin being obstructed by deformation of the ejector pin but also ensures the structural strength of the middle section of the backing plate.

[0010] Preferably, the lower through hole is a vertical straight hole.

[0011] Preferably, the pad includes an inner core and a sleeve fitted over the outer side of the core, with the top through hole located in the middle of the core. By configuring the pad as a separate inner and outer structure, only the core needs to be replaced when the core deforms, eliminating the need to replace the entire pad.

[0012] Preferably, an installation hole is provided inside the plate sleeve, a limiting protrusion is provided at the bottom of the side wall of the installation hole, and a limiting pressure plate is provided on the outer periphery of the plate core. The plate core is embedded in the installation hole, and the limiting pressure plate presses on the limiting protrusion.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. This utility model can avoid the problem of the top material rod being hindered from moving upward due to the deformation of the top material through hole, and will not affect the structural strength of the middle part of the pad.

[0015] 2. The structure of the upper and middle through holes of this utility model can effectively avoid the problem of deformation of the ejector through hole and obstruction of the ejector rod due to the deformation and sinking of the backing plate caused by multiple forgings. This can ensure the stable upward movement of the ejector rod and ensure normal demolding of the workpiece. Attached Figure Description

[0016] Figure 1 This is a longitudinal sectional view of the present invention.

[0017] Figure 2 This is a longitudinal sectional view of the pad of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the top material rod of this utility model;

[0019] Figure 4 This is a longitudinal sectional view of the core of the present invention.

[0020] Figure 5 This is a longitudinal sectional view of the plate sleeve of this utility model;

[0021] As shown in the figure:

[0022] 1. Pad, 11. Core plate, 12. Plate sleeve, 111. Limiting pressure table, 121. Limiting protrusion;

[0023] 2. Top material rod, 21. Rod part, 22. Top material part;

[0024] 3. Top material through hole; 31. Upper section through hole; 32. Middle section through hole; 33. Lower section through hole. Detailed Implementation

[0025] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0026] like Figure 1-3 As shown, this utility model includes a pad 1 and a top material rod 2 that can penetrate the middle of the pad 1. A top material through hole 3 is provided in the middle of the pad 1 for the top material rod 2 to pass through. The top material through hole 3 includes an upper through hole 31, a middle through hole 32 and a lower through hole 33 arranged sequentially from top to bottom. The upper through hole 31 and the middle through hole 32 are both funnel-shaped through holes with an upper diameter larger than a lower diameter, and the lower through hole 33 is a vertical straight hole.

[0027] The ejector rod 2 includes a rod portion 21 and an ejector portion 22 fixed to the upper end of the rod portion 21. The ejector portion 22 is an inverted frustum-shaped structure with an upper diameter larger than the lower diameter. The structure of the ejector portion 22 increases the ejector area at the top of the ejector rod 2, improving the stability of the ejector. The ejector portion 22 of the ejector rod 2 is adapted to the middle section through hole 32. After the ejector rod 2 is inserted into the ejector through hole 32, its ejector portion 22 is located inside the middle section through hole 32. Its rod portion 21 passes through the lower section through hole 33 and extends to the bottom of the pad plate 1 and connects to the drive mechanism. The drive mechanism drives the ejector rod 2 to move up and down. When the ejector rod 2 moves up, the ejector portion 22 moves out of the ejector through hole 3, pushing the lower mold core to move up. The lower mold core moves up and pushes the workpiece out of the forming groove, realizing the demolding of the workpiece. The drive mechanism adopts an existing structure, which will not be described in detail here.

[0028] In this embodiment, the angle α between the slope of the upper through hole 31 and the vertical direction is 5-7°. The angle β between the slope of the middle through hole 32 and the vertical direction is 30-35°. The structural arrangement of the upper through hole 31 and the middle through hole 32 can effectively avoid the problem of deformation of the ejector through hole 3 hindering the upward movement of the ejector rod 2 due to the deformation and sinking of the backing plate 1 caused by repeated forging. This ensures the stable upward movement of the ejector rod 2 and guarantees normal workpiece demolding. The upper through hole 31 and the middle through hole 32 are set in sections, and the angle between the slope of the upper through hole 31 and the middle through hole 32 and the vertical direction is reasonably controlled. This can both avoid the problem of the ejector through hole 3 hindering the upward movement of the ejector rod 2 and ensure the structural strength of the middle part of the backing plate 1.

[0029] The pad 1 includes an inner core 11 and a sleeve 12 fitted over the outer side of the core 11. The pad 1 is designed as a separate inner and outer structure, so that when the core 11 deforms, only the core 11 needs to be replaced, without replacing the entire pad 1. Figure 4-5 As shown, a mounting hole is provided inside the plate sleeve 12, and a limiting protrusion 121 is provided at the bottom of the side wall of the mounting hole. A limiting pressure plate 111 is provided around the outer periphery of the plate core 11. The plate core 11 is embedded in the mounting hole, and the limiting pressure plate 111 presses on the limiting protrusion 121. The top material through hole 3 is located in the middle of the plate core 11. In this embodiment, the plate core 11 is made of 5CrNiMo steel with high hardness.

[0030] In practical use, after the workpiece is formed, the ejector rod 2 is controlled to move upward. After the ejector part 22 of the ejector rod 2 moves out of the ejector through hole 3, it pushes the lower end of the lower mold core, causing the lower mold core and the workpiece to move upward, thus realizing the demolding of the workpiece. This utility model can avoid the problem of the ejector rod 2 being hindered from moving upward due to the deformation of the ejector through hole 3, and will not affect the structural strength of the middle part of the pad 1.

[0031] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A press lower die knock out structure characterized by: The device comprises a base plate and a top material rod capable of penetrating the middle part of the base plate, a top material through hole is arranged in the middle part of the base plate for the top material rod to penetrate, the top material through hole comprises an upper section through hole, a middle section through hole and a lower section through hole arranged in sequence from top to bottom, the upper section through hole and the middle section through hole are both trumpet-shaped through holes with the upper end diameter larger than the lower end diameter; the top material rod comprises a rod part and a top material part fixed to the upper end of the rod part, the top material part is a rounded table structure with the upper end diameter larger than the lower end diameter.

2. The ejector structure of claim 1, wherein: After the top material rod is inserted into the top material through hole, the top material part is located in the middle section through hole, and the rod part penetrates through the lower section through hole and extends to the lower part of the base plate and is connected with a driving mechanism.

3. The ejector structure of claim 1 wherein: The included angle between the slope surface of the upper section through hole and the vertical direction is 5-7°.

4. The ejector structure of claim 1 wherein: The included angle between the slope surface of the middle section through hole and the vertical direction is 30-35°.

5. The ejector structure of claim 1 wherein: The lower section through hole is a vertical straight hole.

6. The ejector structure of claim 1 wherein: The base plate comprises an internal plate core and a plate sleeve sleeved outside the plate core, and the top material through hole is arranged in the middle part of the plate core.

7. The ejector structure of claim 6 wherein: A mounting hole is arranged in the plate sleeve, a limiting protrusion is arranged on the bottom of the side wall of the mounting hole, a limiting pressing table is arranged on the outer periphery of the plate core, the plate core is embedded in the mounting hole, and the limiting pressing table is pressed on the limiting protrusion.

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