Powder pressing device

Abstract

The utility model provides a powder pressing device which comprises an upper die base, an upper die pressing plate and an upper punch, an upper die telescopic rod is arranged in the upper die base, the upper die pressing plate is connected to the lower surface of the upper die base through the upper die telescopic rod, and the upper punch is arranged on the lower surface of the upper die pressing plate. A lower die base is arranged under the upper die base, a lower die is arranged in the lower die base, a forming cavity is formed in the position, corresponding to the upper punch, in the lower die, and an ejector rod is arranged at the bottom of the forming cavity. According to the powder pressing device, the defect that a blank falls off or is layered during demolding after powder is pressed and formed can be overcome, and the stress condition of the blank during demolding is improved.

Description

Technical Field

[0001] The utility model relates to the field of molds, and specifically, to a powder pressing device. Background Art

[0002] In the powder pressing and forming process, a four-column hydraulic press is usually used for pressing. For the blank powder with low initial strength during pressing, due to excessive frictional force during the demolding process, the blank after demolding will have chipping or delamination. At present, the industry can only adopt the rework method for disposal, which seriously affects the first-pass qualification rate and results in high production costs.

[0003] In order to improve the powder pressing effect and qualification rate, the utility model patent with the authorization announcement number CN219988562U discloses a two-station forming device for a perforated crystal bed sheet, including a press upper slider backing plate, a press die holder upper backing plate, a press die holder large base, and a press die holder lower backing plate. At the bottom of the press die holder upper backing plate, a pre-pressing punch unit and a final-pressing punch unit are arranged side by side. At the top of the press die holder lower backing plate, a pre-pressing die cavity unit and a final-pressing die cavity unit are arranged side by side. Ejector rods are respectively arranged on the pre-pressing die cavity unit and the final-pressing die cavity unit. The pre-pressing punch unit cooperates with the pre-pressing die cavity unit to press and form a pre-pressed blank. At the bottom of the final-pressing punch unit, a number of base protrusions for pressing out blind holes are provided. The final-pressing punch unit cooperates with the final-pressing die cavity unit to press blind holes on the pre-pressed blank to form a final-pressed blank. This two-station forming device for a perforated crystal bed sheet can disperse the deformation amount, reduce the deformation amount during the pressing process of the crystal bed sheet, thereby reducing the force on the mold and prolonging the service life of the mold. However, this two-station forming device for a perforated crystal bed sheet still uses the direct top layer mode for demolding after pressing, and there are still defects such as chipping or delamination of the blank after demolding. Summary of the Utility Model

[0004] In order to avoid the defects of chipping or delamination of the blank during the demolding of the powder after pressing and improve the stress condition of the blank during demolding, the technical solution adopted by the utility model is: a powder pressing device, including an upper die base, an upper die pressing plate, and an upper punch. An upper die telescopic rod is arranged inside the upper die base. The upper die pressing plate is connected to the lower surface of the upper die base through the upper die telescopic rod. The upper punch is arranged on the lower surface of the upper die pressing plate.

[0005] A lower die base is arranged directly below the upper die base. A lower die is arranged inside the lower die base. A forming cavity is opened in the lower die corresponding to the upper punch. A knockout rod is arranged at the bottom of the forming cavity.

[0006] Based on the above, in order to ensure that the pressed blank is always subjected to pressure from the upper and lower ends when ejected, the upper mold telescopic rod is linked with the hydraulic rod of the oil hydraulic press to drive the upper mold platen to be stationary relative to the lower mold through its own extension when the hydraulic rod retracts.

[0007] Based on the above, the upper mold telescopic rod cooperates with the ejector rod so that when the ejector rod is ejected, the upper mold pressing plate is driven to retreat to the side of the upper mold base at the same speed as the ejector rod is ejected through its own contraction.

[0008] Based on the above, displacement sensors are respectively arranged on the upper die telescopic rod, the ejector rod and the hydraulic rod of the oil press.

[0009] Based on the above, the upper mold telescopic rod is a gas telescopic rod, an electric telescopic rod or a hydraulic telescopic rod.

[0010] Based on the above, in order to improve the pressing efficiency, it includes multiple upper punches and multiple forming cavities, the multiple upper punches are arranged at equal intervals, and the multiple forming cavities are arranged at equal intervals.

[0011] Based on the above, in order to achieve smooth pressing, a guide column is further provided on the upper die base, and a guide sleeve used in conjunction with the guide column is further provided on the lower die base.

[0012] The utility model has substantial characteristics and progress compared with the prior art. Specifically, the powder pressing device provided by the utility model can achieve that after the powder is pressed, the upper punch does not retreat with the upper die seat under the action of the upper die telescopic rod, but continues to apply the upper punch's own gravity to the blank in the molding cavity of the lower die, so that the blank is always subjected to pressure from the upper and lower ends during the ejection process, which can ensure that the blank with poor strength can be ejected as a whole and has good integrity during the ejection process.

[0013] Therefore, the powder pressing device can effectively avoid the defects of blank falling off or delamination when the powder is demolded after pressing and molding, improve the stress condition of the blank during demolding, and improve the qualified rate of powder pressing in one time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic structural diagram of a powder pressing device provided by the utility model installed on a press machine.

[0015] Figure 2 It is a schematic diagram of the powder pressing device provided by the utility model during powder pressing and molding.

[0016] Figure 3 It is a schematic diagram of the retention state of the upper punch of the powder pressing device provided by the utility model after the powder is pressed and formed.

[0017] Figure 4 and Figure 5 It is a schematic diagram of the state in which the ejector rod of the powder pressing device provided by the utility model is ejected and the upper punch is retracted after the powder is pressed and formed.

[0018] In the figure: 1. lower die base; 2. hydraulic press base; 3. upper punch; 4. upper die base; 5. ejector rod; 6. lower die; 7. forming cavity; 8. hydraulic rod; 9. upper die telescopic rod; 10. hydraulic press column; 11. hydraulic press pressure plate; 12. upper die pressure plate; 13. blank. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further described in detail below through specific implementation methods.

[0020] Example 1

[0021] This embodiment provides a powder pressing device, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, it includes an upper die base 4, an upper die pressing plate 12 and an upper punch 3. An upper die telescopic rod 9 is arranged in the upper die base 4, and the upper die pressing plate 12 is connected to the lower surface of the upper die base 4 through the upper die telescopic rod 9. The upper punch 3 is arranged on the lower surface of the upper die pressing plate 12.

[0022] A lower die base 1 is arranged directly below the upper die base 4 , a lower die 6 is arranged inside the lower die base 1 , a forming cavity 7 is opened in the lower die 6 corresponding to the upper punch 3 , and a ejector rod 5 is arranged at the bottom of the forming cavity 7 .

[0023] In this embodiment, in order to ensure that the pressed blank is always subjected to pressure from the upper and lower ends when ejected, the upper mold telescopic rod cooperates with the hydraulic rod 8 of the oil hydraulic press to drive the upper mold platen to be stationary relative to the lower mold through its own extension when the hydraulic rod retracts.

[0024] The upper mold telescopic rod cooperates with the ejector rod to drive the upper mold platen to retreat to the upper mold base at the same speed as the ejector rod when the ejector rod ejects the blank 13. In this embodiment, the upper mold telescopic rod can be a gas telescopic rod.

[0025] Specifically, when the powder pressing device is installed, the upper die seat is installed on the hydraulic press plate of the hydraulic press, a hydraulic rod 8 is arranged on the top of the hydraulic press plate, and the top of the hydraulic rod is fixed on the hydraulic press top seat. The lower die seat 1 is installed on the hydraulic press base 2 of the hydraulic press, a hydraulic press column 10 is arranged between the hydraulic press base and the hydraulic press top seat, and the hydraulic rod drives the hydraulic press plate 11 to slide on the hydraulic press column.

[0026] Example 2

[0027] This embodiment provides a powder pressing device. The main difference from Embodiment 1 is that in this embodiment: displacement sensors are respectively arranged on the upper die telescopic rod, the ejector rod, and the hydraulic rod of the hydraulic press.

[0028] Example 3

[0029] This embodiment provides a powder pressing device. The main difference from Embodiment 1 is that in this embodiment: to improve the pressing efficiency, it includes a plurality of upper punches and a plurality of forming cavities. The plurality of upper punches are arranged at equal intervals, and the plurality of forming cavities are arranged at equal intervals. To ensure stable pressing, guide columns are further arranged on the upper die base, and guide sleeves for cooperating with the guide columns are further arranged on the lower die base.

[0030] Specifically, when using the powder pressing device provided by the present utility model for powder pressing and forming, the specific operation steps are as follows:

[0031] First, fill the powder into the forming cavity in the lower die, and then operate the hydraulic rod of the hydraulic press to extend, driving the hydraulic press platen to move downward, and then driving the upper die base, the upper die platen, the upper punch, and the upper die telescopic rod to move downward as a whole, so that the upper punch enters the forming cavity to press the powder to form a blank.

[0032] After pressure holding, operate the hydraulic rod of the hydraulic press to contract upward, and at the same time operate the upper die telescopic rod to extend downward, so that when the upper die base moves upward, the upper die platen remains stationary relative to the lower die, ensuring that the upper punch always presses on the blank by its own gravity.

[0033] When the hydraulic rod of the hydraulic press retracts in place, the ejector rod starts to eject. At this time, operate the ejector rod to move upward, and at the same time, synchronously operate the upper die telescopic rod to contract upward, so that the upper die platen retracts toward the upper die base side at the same speed as the ejector rod ejects.

[0034] After ejecting in place, the upper die telescopic rod continues to contract upward, causing the upper die platen to fit with the upper die base.

[0035] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present utility model or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present utility model, they should all be covered within the scope of the technical solutions claimed by the present utility model.

Claims

1. A powder pressing device, characterized in that: It includes an upper die base, an upper die pressing plate and an upper punch, wherein an upper die telescopic rod is arranged in the upper die base, the upper die pressing plate is connected to the lower surface of the upper die base through the upper die telescopic rod, and the upper punch is arranged on the lower surface of the upper die pressing plate; A lower die seat is arranged directly below the upper die seat, a lower die is arranged inside the lower die seat, a forming cavity is opened in the lower die corresponding to the upper punch, and a ejector rod is arranged at the bottom of the forming cavity.

2. The powder pressing device according to claim 1, wherein: The upper die telescopic rod cooperates with the hydraulic rod of the oil press, and is used to drive the upper die pressing plate to be stationary relative to the lower die through its own extension when the hydraulic rod retreats.

3. The powder pressing device according to claim 2, wherein: The upper die telescopic rod cooperates with the ejector rod in a linkage manner so as to drive the upper die pressing plate to retreat toward the upper die seat at the same speed as the ejector rod when the ejector rod is ejected.

4. The powder pressing device according to claim 1 or 2 or 3, characterized in that: Displacement sensors are respectively arranged on the upper die telescopic rod, the ejector rod and the hydraulic rod of the oil press.

5. The powder pressing device according to claim 4, wherein: The upper mold telescopic rod is a gas telescopic rod, an electric telescopic rod or a hydraulic telescopic rod.

6. The powder pressing device according to claim 1, characterized in that: It comprises a plurality of upper punches and a plurality of forming cavities, wherein the plurality of upper punches are arranged at equal intervals, and the plurality of forming cavities are arranged at equal intervals.

7. The powder pressing device according to claim 1 or 2 or 3 or 6, characterized in that: The upper die base is also provided with a guide post, and the lower die base is also provided with a guide sleeve used in conjunction with the guide post.

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