Molding press for pressing annular workpiece

Abstract

The utility model discloses a forming press for pressing circular workpieces, which comprises a frame, an upper guide plate, an upper punch, an upper electric cylinder, a die, a lower guide plate, a lower punch, a lower electric cylinder, a core rod and a core-pulling electric cylinder, the die is fixedly arranged in the middle of the frame, the upper electric cylinder is fixedly mounted at the top of the frame, and the lower electric cylinder is fixedly mounted at the bottom of the frame. The upper guide plate is arranged at the upper end of the die and can vertically move under the action of the upper electric cylinder, the upper punch is fixedly connected to the lower end of the upper guide plate, the lower electric cylinder is fixedly installed at the bottom of the rack, the lower guide plate is arranged at the lower end of the die and can vertically move under the action of the lower electric cylinder, and the lower punch is fixedly connected to the upper end of the lower guide plate. The core pulling electric cylinder is fixedly arranged at the bottom of the rack, the core rod can stretch out and draw back along the die cavity of the die under the action of the core pulling electric cylinder, and through the arrangement, the uniformity and compactness of pressing can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of forming presses, in particular to a forming press for pressing annular workpieces. Background Art

[0002] Powder metallurgy is a process technology that uses metal powder (or a mixture of metal powder and non-metallic powder) as powder, and after pressing and sintering, makes parts of various shapes. Its process flow generally includes three steps: mixing, pressing and sintering to obtain the finished product. The existing powder forming press is generally equipped with an upper die, a middle die and a lower die, wherein the die is fixed on the box body. The powder forming and demoulding of the powder forming press are completed by the lower die under the middle die plate and its driving device. In the actual production process, the existing forming press has a poor effect in pressing the raw material powder, so that the product qualification rate needs to be improved, and therefore the existing forming press needs to be improved. Summary of the Invention

[0003] The utility model aims to provide a forming press for pressing annular workpieces, which can make the pressing more compact and uniform.

[0004] The above-mentioned technical purpose of the present utility model is achieved through the following technical solutions: a forming press for pressing annular workpieces, comprising a frame, an upper guide plate, an upper punch, an upper electric cylinder, a mold, a lower guide plate, a lower punch, a lower electric cylinder, a core rod and a core-pulling electric cylinder, the mold is fixedly arranged in the middle of the frame, the upper electric cylinder is fixedly installed on the top of the frame, the upper guide plate is arranged at the upper end of the mold and can move vertically under the action of the upper electric cylinder, the upper punch is fixedly connected to the lower end of the upper guide plate, the lower electric cylinder is fixedly installed at the bottom of the frame, the lower guide plate is arranged at the lower end of the mold and can move vertically under the action of the lower electric cylinder, the lower punch is fixedly connected to the upper end of the lower guide plate, the core-pulling electric cylinder is fixedly arranged at the bottom of the frame, and the core rod can extend and retract along the mold cavity of the mold under the action of the core-pulling electric cylinder.

[0005] Furthermore, the core-pulling electric cylinder is arranged in the middle position of the bottom of the frame, and the lower electric cylinder is symmetrically provided in two groups and is separated on both sides of the core-pulling electric cylinder.

[0006] Furthermore, the lower die punch is provided with a communicating hole with an opening on the lower end surface, and the diameter of the communicating hole is adapted to the outer diameter of the core rod.

[0007] Furthermore, an escape channel is provided through the lower die punch, the aperture of the escape channel is adapted to the core rod, and the core rod can slide vertically along the escape channel.

[0008] Furthermore, the frame is provided with a guide column, and the upper guide plate and the lower guide plate are respectively sleeved on the frame and can slide vertically along the guide column.

[0009] Furthermore, the upper punch includes an upper connecting part, a necking part and a lower end head integrally formed from top to bottom, the outer diameter of the lower end head is adapted to the inner diameter of the mold cavity, the outer diameter of the upper connecting part is smaller than the outer diameter of the lower end head, the outer diameter of the necking part gradually increases from one end adjacent to the upper connecting part to one end adjacent to the lower end head, the outer diameter of the end of the necking part adjacent to the upper connecting part is consistent with the upper connecting part, and the outer diameter of the end of the necking part adjacent to the lower end head is consistent with the lower end head.

[0010] Furthermore, the lower guide plate is provided with a through hole for the core rod to pass through.

[0011] In summary, the present invention has the following beneficial effects:

[0012] In the utility model, a structure of full voltage pressing of raw material powder is adopted in which an upper electric cylinder cooperates with an upper punch, a lower electric cylinder cooperates with a lower punch, and a core-pulling electric cylinder cooperates with a core rod, which can effectively improve the uniformity and density of the pressing. In addition, a connecting hole adapted to the core rod is provided on the lower end face of the upper punch, which can effectively improve the stability of the pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model from the first perspective.

[0014] Figure 2 This utility model Figure 2 Enlarged view of point A.

[0015] Figure 3 This utility model Figure 2 Enlarged view of point B.

[0016] Figure 4 It is a schematic diagram of the overall structure of the utility model from a second viewing angle.

[0017] Figure 5 It is a longitudinal sectional view of the magnetizing component of the present utility model.

[0018] Figure 6 It is a transverse cross-sectional view of the magnetizing component of the present utility model.

[0019] Figure 7 It is a schematic diagram of the installation structure of the upper electromagnetic coil and the lower electromagnetic coil of the utility model.

[0020] Figure 8 This utility model Figure 7 Enlarged view of point C.

[0021] In the figure: 10, frame; 11, guide column; 20, upper guide plate; 21, upper punch; 211, upper connecting part; 212, necking part; 213, lower end; 214, connecting hole; 30, upper cylinder; 40, mold; 50, lower guide plate; 51, lower punch; 511, avoidance channel; 52, through hole; 60, lower cylinder; 70, core rod; 80, core-pulling cylinder; 90, filling Magnetic assembly; 901, yoke body; 902, coil winding; 903, winding part; 904, outer magnetic ring; 100, cover plate; 110, mounting plate; 120, upper electromagnet assembly; 1201, upper pole; 1202, upper electromagnetic coil; 1203, upper pole head; 130, lower electromagnet assembly; 1301, lower pole; 1302, lower electromagnetic coil; 1303, lower pole head. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] like Figures 1-8 As shown, a forming press for pressing annular workpieces includes a frame 10, an upper guide plate 20, an upper die punch 21, an upper electric cylinder 30, a mold 40, a lower guide plate 50, a lower die punch 51, a lower electric cylinder 60, a core rod 70 and a core-pulling electric cylinder 80. The mold 40 is fixedly arranged in the middle of the frame 10. Specifically, a mounting plate 110 is fixedly arranged in the middle of the frame 10, and the mold 40 is fixedly mounted on the mounting plate 110. The upper electric cylinder 30 is fixedly mounted on the top of the frame 10. Plate 20 is mounted on the upper end of mold 40 and is capable of vertical movement under the action of upper electric cylinder 30. Upper punch 21 is fixedly connected to the lower end of upper guide plate 20. Lower electric cylinder 60 is fixedly mounted on the bottom of frame 10. Lower guide plate 50 is mounted on the lower end of mold 40 and is capable of vertical movement under the action of lower electric cylinder 60. Lower punch 51 is fixedly connected to the upper end of lower guide plate 50. Core-pulling electric cylinder 80 is fixedly mounted on the bottom of frame 10. Core rod 70 is capable of extending and retracting along the mold cavity of mold 40 under the action of core-pulling electric cylinder 80. Lower punch 51 extends into the mold cavity of mold 40. Lower punch 51, core rod 70, and mold 40 form an annular cavity for filling with raw material powder.

[0024] The core-pulling electric cylinder 80 is arranged in the middle position of the bottom of the frame 10, and the lower electric cylinder 60 is symmetrically provided in two groups and separated on both sides of the core-pulling electric cylinder 80. By setting two groups of lower electric cylinders 60, the stability of driving the lower guide plate 50 to move can be improved, and the force during pressing can be increased.

[0025] The lower punch 51 is provided with a connecting hole 214 with an opening on the lower end face. The aperture of the connecting hole 214 is adapted to the outer diameter of the core rod 70. The utility model provides a connecting hole 214 on the lower end face of the upper punch 21. During pressing, the upper punch 21 partially extends into the die cavity and the core rod 70 extends into the connecting hole 214, thereby playing a positioning role. When pressing the raw material powder, the upper punch 21 and the core rod 70 can move downward smoothly and synchronously, thereby improving the stability during pressing.

[0026] The lower punch 51 is provided with an escape channel 511 extending therethrough. The diameter of the escape channel 511 is adapted to the core rod 70, allowing the core rod 70 to slide vertically along the escape channel 511. The escape channel 511 of the lower punch 51 is adapted to the core rod 70, allowing the core rod 70 and the lower punch 51 to slide smoothly and smoothly relative to each other. Furthermore, the lower guide plate 50 is provided with a through hole 52 for the core rod 70 to pass through.

[0027] The frame 10 is provided with a guide column 11, and the upper guide plate 20 and the lower guide plate 50 are respectively mounted on the frame 10 and can slide vertically along the guide column 11. There are four guide columns 11 and they are separated around the frame 10. The upper guide plate 20 and the lower guide plate 50 can slide more smoothly along the guide column 11.

[0028] The upper punch 21 includes an upper connecting portion 211, a necking portion 212 and a lower end head 213 integrally formed from top to bottom. The outer diameter of the lower end head 213 is adapted to the inner diameter of the mold cavity of the mold 40. The outer diameter of the upper connecting portion 211 is smaller than the outer diameter of the lower end head 213. The outer diameter of the necking portion 212 gradually increases from the end adjacent to the upper connecting portion 211 to the end adjacent to the lower end head 213. The outer diameter of the end of the necking portion 212 adjacent to the upper connecting portion 211 is consistent with the upper connecting portion 211, and the outer diameter of the end of the necking portion 212 adjacent to the lower end head 213 is consistent with the lower end head 213. By designing the upper punch 21, the friction between the upper punch 21 and the mold 40 can be effectively reduced.

[0029] In summary, the present invention has the following beneficial effects:

[0030] In the present invention, a structure of full voltage forming raw material powder using an upper electric cylinder 30 in conjunction with an upper punch 21, a lower electric cylinder 60 in conjunction with a lower punch 51, and a core-pulling electric cylinder 80 in conjunction with a core rod 70 can effectively improve the uniformity and density of the pressing. In addition, a connecting hole 214 is provided on the lower end face of the upper punch 21 to match the core rod 70, which can effectively improve the stability of the pressing.

[0031] In some embodiments, in order to suppress the multipole magnetic ring, a magnetizing assembly 90 can be added to the outer periphery of the mold 40, the magnetizing assembly 90 comprising a magnetic yoke body 901 and a plurality of coil windings 902, the magnetic yoke body 901 comprising a plurality of winding portions 903 arranged uniformly in the circumferential direction on the outer periphery of the mold 40, the coil winding 902 being wound on each winding portion 903, the winding directions of the coil windings 902 on adjacent winding portions 903 being opposite, further, the outer periphery of the plurality of magnetic yoke bodies 901 being connected with or formed with an outer magnetic conducting ring 904, the winding portions 903 being uniformly distributed in the circumferential direction on the inner ring of the outer magnetic conducting ring 904, the top of the magnetic yoke body 901 being connected with a cover plate 100, the cover plate 100 playing a protective role and at the same time avoiding that the raw material powder enters the position where the coil winding 902 is located.

[0032] In some embodiments, in order to suppress the full-radiation magnetic ring, an upper electromagnet assembly 120 can be arranged at the lower end of the upper guide plate 20, the upper electromagnet assembly 120 comprising an upper pole column 1201 fixedly installed in the middle of the upper guide plate 20, an upper electromagnet coil 1202 arranged on the outer periphery of the upper pole column 1201, an upper pole head 1203 arranged on the lower part of the upper pole column 1201, the upper mold punch 21 being fixed at the lower end of the upper pole head 1203, and similarly, a lower electromagnet assembly 130 can be arranged at the upper end of the lower guide plate 50, the lower electromagnet assembly 130 comprising a lower pole column 1301 fixedly installed in the middle of the lower guide plate 50, a lower electromagnet coil 1302 arranged on the outer periphery of the lower pole column 1301, a lower pole head 1303 arranged on the upper part of the lower pole column 1301, and the lower mold punch 51 being fixed at the upper end of the lower pole head 1303, in this embodiment, the mold 40 and the mounting plate 110 can be arranged in an integral molding structure, the upper end of the mold 40 protruding from the mounting plate 110, the lower end of the mold 40 protruding from the mounting plate 110, and the integral molding structure of the mold 40 and the mounting plate 110 being made of a magnetic conducting material.

[0033] The above description is only a preferred embodiment of the present application, and any equivalent changes or modifications made to the structure, features and principles described in the patent application range of the present application are included in the patent application range of the present application.

Claims

1. A forming press for pressing annular workpieces, characterized in that: The machine comprises a frame (10), an upper guide plate (20), an upper die punch (21), an upper electric cylinder (30), a mold (40), a lower guide plate (50), a lower die punch (51), a lower electric cylinder (60), a core rod (70) and a core-pulling electric cylinder (80), wherein the mold (40) is fixedly arranged in the middle of the frame (10), the upper electric cylinder (30) is fixedly installed on the top of the frame (10), the upper guide plate (20) is arranged on the upper end of the mold (40) and can move vertically under the action of the upper electric cylinder (30). The upper die punch (21) is fixedly connected to the lower end of the upper guide plate (20), the lower electric cylinder (60) is fixedly installed at the bottom of the frame (10), the lower guide plate (50) is arranged at the lower end of the mold (40) and can move vertically under the action of the lower electric cylinder (60), the lower die punch (51) is fixedly connected to the upper end of the lower guide plate (50), the core pulling electric cylinder (80) is fixedly arranged at the bottom of the frame (10), and the core rod (70) can be extended and retracted along the mold cavity of the mold (40) under the action of the core pulling electric cylinder (80).

2. A forming press for pressing annular workpieces according to claim 1, characterized in that: The core-pulling electric cylinder (80) is arranged at the middle position of the bottom of the frame (10), and the lower electric cylinder (60) is symmetrically provided with two groups and is separated on both sides of the core-pulling electric cylinder (80).

3. A forming press for pressing annular workpieces according to claim 1, characterized in that: The lower die punch (51) is provided with a communicating hole (214) with an opening at the lower end surface, and the diameter of the communicating hole (214) is adapted to the outer diameter of the core rod (70).

4. A forming press for pressing annular workpieces according to claim 1, characterized in that: An escape channel (511) is provided through the lower die punch (51), the aperture of the escape channel (511) is adapted to the core rod (70), and the core rod (70) can slide vertically along the escape channel (511).

5. A forming press for pressing annular workpieces according to claim 1, characterized in that: The frame (10) is provided with a guide column (11), and the upper guide plate (20) and the lower guide plate (50) are respectively sleeved on the frame (10) and can slide vertically along the guide column (11).

6. A forming press for pressing an annular workpiece according to any one of claims 1 to 5, characterized in that: The upper die punch (21) comprises an upper connecting portion (211), a necking portion (212) and a lower end head (213) integrally formed from top to bottom. The outer diameter of the lower end head (213) is adapted to the inner diameter of the die cavity of the mold (40). The outer diameter of the upper connecting portion (211) is smaller than the outer diameter of the lower end head (213). The outer diameter of the necking portion (212) gradually increases from one end adjacent to the upper connecting portion (211) to one end adjacent to the lower end head (213). The outer diameter of the end of the necking portion (212) adjacent to the upper connecting portion (211) is consistent with that of the upper connecting portion (211), and the outer diameter of the end of the necking portion (212) adjacent to the lower end head (213) is consistent with that of the lower end head (213).

7. A forming press for pressing annular workpieces according to claim 4, characterized in that: The lower guide plate (50) is provided with a through hole (52) for the core rod (70) to pass through.

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