CN216705941U

CN216705941U - Powder metallurgy part press forming machine

Info

Publication number: CN216705941U
Application number: CN202220234292.5U
Authority: CN
Inventors: 项大清
Original assignee: Taizhou Sincere Diamond Machinery Co ltd
Current assignee: Taizhou Sincere Diamond Machinery Co ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-06-10
Anticipated expiration: 2032-01-26

Abstract

The utility model provides a powder metallurgy part press forming machine, and belongs to the technical field of powder metallurgy. It has solved the problem that the press forming machining efficiency of the powder metallurgy part of the existing multilayer structure is low. The powder metallurgy part press forming machine comprises a rack with a working table plate, an avoidance driving mechanism and a layered prepressing device positioned above the working table plate, wherein an upper pressure head assembly and a lower ejector rod assembly are arranged on the rack; the layering pre-compaction device comprises a pre-compaction base and a second pressure head, an avoiding driving mechanism is connected with the pre-compaction base and can enable the second pressure head to move between the pressing forming die and the upper pressure head assembly, a second driving assembly connected with the second pressure head is installed on the pre-compaction base and can drive the second pressure head to be embedded into a powder metallurgy part forming cavity of the pressing forming die from top to bottom. The powder is pre-pressed by the layered pre-pressing device, so that the moving stroke of the pressure head is reduced, the moving speed of the pressure head is increased, and the processing efficiency is improved.

Description

Powder metallurgy part press forming machine

Powder metallurgy part press forming machine.

Technical Field

The utility model belongs to the technical field of powder metallurgy, and relates to a powder metallurgy press forming machine, in particular to a powder metallurgy part press forming machine.

Background

The multilayer powder metallurgy part is more in variety, such as a multi-cylinder rotary compressor partition (application No. 201911063826.1), and a production method for orderly arranging diamond sintered bodies (application No. 202010934007.6).

At present, the multilayer powder metallurgy part is also pressed and formed by a traditional hydraulic press; namely, the forming die is fixed on the working table plate, the upper pressure head is fixed on the upper lifting platform, the lower mandril is fixed on the lower lifting platform, the prepressing backer is installed on the frame, after a layer of powder is filled in the die, the piston rod of the hydraulic cylinder needs to be controlled to descend, and the upper lifting platform moves on the prepressing backer, so that prepressing forming is realized. In the process of producing the diamond tool bit, the following defects exist: 1. the prepressing layer number of the cutter head is more than 5 layers generally, and the moving speed of the piston rod of the hydraulic cylinder is low, so that the problems of long processing time and low processing efficiency exist. 2. The difference of the loose powder filling ratio of the powder filled into the die and the existence of the tiny area is objective, so that the density of each layer of powder after prepressing is different, and the consistency of the quality of the cutter head is lower.

Disclosure of Invention

The utility model provides a powder metallurgy part press forming machine, and aims to solve the technical problem of how to provide the powder metallurgy part press forming machine which is particularly suitable for processing powder metallurgy parts with multilayer structures and can improve the processing efficiency.

The technical problem to be solved by the utility model can be realized by the following technical scheme: a powder metallurgy part compression molding machine comprises a machine frame with a working table plate, wherein a compression molding die is fixed on the working table plate, an upper pressure head assembly and a lower ejector rod assembly are arranged on the machine frame, and the upper pressure head assembly is positioned above the working table plate; the powder metallurgy part press forming machine further comprises an avoidance driving mechanism and a layered prepressing device located above the working table plate, the layered prepressing device comprises a prepressing base and a second pressing head, the avoidance driving mechanism is connected with the prepressing base, the avoidance driving mechanism can enable the second pressing head to move between the press forming die and the upper pressing head assembly and enable the second pressing head to move to one side of the press forming die, a second driving assembly connected with the second pressing head is installed on the prepressing base, and when the second pressing head is located between the press forming die and the upper pressing head assembly, the second driving assembly can drive the second pressing head to be embedded into a powder metallurgy part forming cavity of the press forming die from top to bottom.

Compared with the prior art, the powder metallurgy part press forming machine is provided with the avoidance driving mechanism and the layering pre-pressing device, the layering pre-pressing device is driven to move through the avoidance driving mechanism to be in the position of pre-pressing powder, or the layering pre-pressing device is in the avoidance state, and the upper pressing head assembly can press and form powder.

Each layer of powder is pre-pressed and laid by adopting a layered pre-pressing device, the pressure required by pre-pressing the powder is obviously less than the pressure required by pressing and forming a finished product, and the second driving component can be an air cylinder, a small-sized oil cylinder or a motor. The powder is pre-pressed by the layered pre-pressing device, so that the moving stroke of the pressure head is reduced, the moving speed of the pressure head is increased, and the processing efficiency is improved. According to the actual processing condition, the control can be carried out according to the output pressure of the second pressure head and the moving stroke of the second pressure head. Because the output acting force of the second driving component is small, the output pressure precision of the second pressure head is obviously improved, and the density consistency of each layer of powder after prepressing is further improved.

The avoidance driving mechanism can adopt any one of the following schemes: first, in the powder metallurgy part press-forming machine described above, the avoidance driving mechanism connects the pre-pressing base to the work table of the machine frame. The avoidance driving mechanism comprises a linear guide rail assembly and a third motor lead screw nut assembly, the prepressing base is connected with the working table plate through the linear guide rail assembly, a motor of the third motor lead screw nut assembly is fixed on the working table plate, and a nut is connected with the prepressing base.

Secondly, in the powder metallurgy part press forming machine, the avoidance driving mechanism enables the pre-pressing base to be connected with the upper pressure head assembly. Go up the pressure head subassembly include with the frame between be connected through first guide structure the last deflector, dodge actuating mechanism and include linear guide subassembly and third motor lead screw nut subassembly, be connected through the linear guide subassembly between pre-compaction base and the last deflector, the motor of third motor lead screw nut subassembly is fixed on last deflector, the screw is connected with the pre-compaction base.

In the powder metallurgy part press forming machine, the number of the powder metallurgy part forming cavities in the press forming die is multiple, the number of the second pressing heads is the same as that of the powder metallurgy part forming cavities, and the second pressing heads can be arranged in one-to-one correspondence with the powder metallurgy part forming cavities.

At foretell powder metallurgy spare press forming machine, the pre-compaction base is connected with the pressure head mount pad through third guide structure, and the pressure head mount pad can the lift removal, and the upper end of second pressure head is fixed on the pressure head mount pad.

In the powder metallurgy part press forming machine, the second driving assembly is a second motor screw rod and nut assembly; the motor of the second motor screw rod and nut assembly is installed on the pre-pressing base, and the nut is connected with the pressure head installation seat. The moving stroke precision of the second pressure head can be obviously improved through the driving of the motor, and further the prepressing efficiency, the density consistency of each layer of powder after prepressing and the powder laying thickness consistency are improved.

The precision of the moving stroke of the second pressure head is further improved through the following scheme: in the powder metallurgy part press forming machine, the layering pre-pressing device further comprises a distance measuring sensor used for detecting the moving stroke of the second pressure head, the distance measuring sensor and the second driving assembly are electrically connected with the control circuit, and the control circuit can control whether the second driving assembly continuously drives the second pressure head to move downwards or not according to the measuring value of the distance measuring sensor.

Secondly, in foretell powder metallurgy spare press forming machine, the layering pre-compaction device still includes the pressure sensor that is used for detecting the pressure value that the second pressure head bore, and pressure sensor and second drive assembly all are connected with control circuit electricity, and control circuit can be according to pressure sensor's measurement numerical control second drive assembly whether continue to drive the second pressure head and move down.

In the powder metallurgy part press forming machine, the lower ejector rod assembly comprises a first driving assembly and a lower ejector rod embedded into a powder metallurgy part forming cavity of the press forming die, and the first driving assembly can drive the lower ejector rod to move up and down; the number of the lower ejector rods is the same as that of the powder metallurgy part forming cavities, and the lower ejector rods and the powder metallurgy part forming cavities are arranged in a one-to-one correspondence mode.

In the powder metallurgy part press forming machine, the lower ejector rod assembly further comprises a lower guide plate, the lower guide plate is connected with the rack through a second guide structure, and the lower ejector rod is fixedly connected with the lower guide plate; the first driving assembly is a first motor screw rod and nut assembly, and a nut of the first motor screw rod and nut assembly is connected with the lower guide plate.

Drawings

Fig. 1 is a schematic perspective view of a layered pre-pressing device in a state between a press forming die and a first press head.

Fig. 2 is a front view schematically showing the state of fig. 1.

Fig. 3 is a cross-sectional partial structural view of a-a in fig. 2.

Fig. 4 is a schematic perspective view of the layered prepressing apparatus in a state of being positioned at one side of the press forming die.

Fig. 5 is a schematic cross-sectional structural view of a second embodiment of the laminating apparatus.

In the figure, 1, a frame; 1a, a workbench plate; 2. an upper ram assembly; 2a, a hydraulic cylinder; 2b, an upper guide plate; 2c, a first pressure head; 2d, a first guide structure; 3. a lower ejector rod assembly; 3a, a first motor screw rod and nut assembly; 3b, a lower guide plate; 3c, a lower ejector rod; 3d, a second guide structure; 4. an avoidance driving mechanism; 4a, a linear guide rail assembly; 4b, a third motor screw rod and nut assembly; 5. a layered pre-pressing device; 5a, prepressing the base; 5b, a second motor screw rod and nut assembly; 5c, a pressure head mounting base; 5d, a second pressure head; 5e, a third guide structure; 5f, a distance measuring sensor; 6. pressing a forming die; 7. a pressure sensor.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

The first embodiment is as follows: as shown in fig. 1 to 4, a powder metallurgy part press forming machine comprises a frame 1, an upper pressure head assembly 2, a lower ejector rod assembly 3, an avoiding driving mechanism 4 and a layered pre-pressing device 5.

The machine frame 1 comprises a horizontally arranged working table plate 1a, the press forming die 6 is provided with a powder metallurgy part forming cavity which is communicated up and down, and the press forming die 6 is fixed on the working table plate 1 a. The figure of the specification shows that the number of the powder metallurgy part forming cavities is four; the number of powder metallurgy forming cavities can be increased or decreased adaptively according to actual conditions.

The upper pressure head assembly 2 is positioned above the workbench plate 1a, and the upper pressure head assembly 2 comprises a hydraulic cylinder 2a, an upper guide plate 2b and a first pressure head 2 c. The cylinder body of the hydraulic cylinder 2a is fixed on the frame 1, the upper guide plate 2b is positioned between the hydraulic cylinder 2a and the working table plate 1a, the upper guide plate 2b is connected with the frame 1 through the first guide structure 2d, the piston rod of the hydraulic cylinder 2a is connected with the upper guide plate 2b, and the first pressure head 2c is fixed on the bottom surface of the upper guide plate 2b, so that the hydraulic cylinder 2a can drive the first pressure head 2c to be embedded into the powder metallurgy part forming cavity of the press forming die 6 from top to bottom. The number of the first pressing heads 2c is the same as that of the powder metallurgy part forming cavities, and the first pressing heads 2c are arranged in one-to-one correspondence with the powder metallurgy part forming cavities. This structure makes first pressure head 2c have the big and even advantage of atress of conveying effort, improves a plurality of multilayer powder metallurgy spare pressurized effort uniformity promptly, realizes improving multilayer powder metallurgy spare quality uniformity.

The lower ram assembly 3 includes a first drive assembly, a lower guide plate 3b, and a lower ram 3 c. The first driving assembly is a first motor screw rod and nut assembly 3 a; of course, according to actual conditions, the first motor screw rod and nut assembly 3a is replaced by an oil cylinder. The lower guide plate 3b is positioned below the working table plate 1a, the lower guide plate 3b is connected with the machine frame 1 through a second guide structure 3d, and a nut of the first motor screw rod nut assembly 3a is connected with the lower guide plate 3 b. The number of the lower ejector rods 3c is the same as that of the powder metallurgy part forming cavities, and the lower ejector rods 3c are arranged in one-to-one correspondence with the powder metallurgy part forming cavities; the upper end part of the lower ejector rod 3c is embedded in the powder metallurgy part forming cavity, and the lower end part of the lower ejector rod 3c is fixedly connected with the lower guide plate 3 b. The limiting backer used for limiting the downward movement stroke of the lower guide plate 3b is fixedly connected to the rack 1, so that the powder loading volume consistency of a forming cavity of the powder metallurgy part is improved, and the damage to the first motor screw rod and nut assembly 3a when the powder is extruded by the upper pressure head assembly 2 is avoided. The first motor screw rod and nut assembly 3a is adopted to drive the lower ejector rod 3c to move up and down, the advantage of high control precision of the lifting stroke is achieved, the powder loading volume consistency of each layer in the powder metallurgy part forming cavity is improved, and the density consistency of each layer of powder after prepressing is improved.

The layered pre-pressing device 5 comprises a pre-pressing base 5a, a second driving assembly, a pressure head mounting seat 5c and a second pressure head 5 d. The number of the second pressing heads 5d is the same as that of the powder metallurgy part forming cavities, and the second pressing heads 5d are arranged in one-to-one correspondence with the powder metallurgy part forming cavities; the upper end portion of the second ram 5d is fixed to the ram mount 5 c. Prepressing base 5a is connected with pressure head mount pad 5c through third guide structure 5e, and pressure head mount pad 5c can the lift removal, improves second pressure head 5d motion stability like this, and the atress is even to and improve the interior powder pre-compaction pressure uniformity of a plurality of powder metallurgy spare forming cavities, realize improving multilayer powder metallurgy spare quality uniformity. The second driving assembly is a second motor screw rod and nut assembly 5 b; and a nut of the second motor screw rod nut component 5b is connected with the pressure head mounting seat 5 c. Of course, according to actual conditions, the second motor screw rod and nut assembly 5b is replaced by an oil cylinder or an air cylinder. The second driving assembly can drive the second ram 5d to be inserted into the powder metallurgy part forming cavity of the press forming die 6 from top to bottom when the second ram 5d is positioned between the press forming die 6 and the first ram 2 c.

And a distance measuring sensor 5f is installed on the pressure head installation seat 5c, the distance measuring sensor 5f and the second driving assembly are electrically connected with a control circuit, and the control circuit can control whether the second driving assembly continuously drives the second pressure head 5d to move downwards or not according to the measuring value of the distance measuring sensor 5 f.

The avoidance driving mechanism 4 connects the prepressing base 5a with the working table plate 1a of the frame 1, and the avoidance driving mechanism 4 can move the second pressing head 5d between the press forming die 6 and the first pressing head 2c and can move the second pressing head 5d to one side of the press forming die 6. The avoidance driving mechanism 4 comprises a linear guide rail assembly 4a and a third motor screw nut assembly 4b, the prepressing base 5a is connected with the working table plate 1a through the linear guide rail assembly 4a, a motor of the third motor screw nut assembly 4b is fixed on the working table plate 1a, and a nut is connected with the prepressing base 5 a.

The function and advantages of the various components of the powder metallurgy press forming machine will be further explained by illustrating the process of manufacturing the diamond segments using the powder metallurgy press forming machine. Firstly, prepressing and forming a first layer of powder; firstly, operating a first driving component of a lower ejector rod component 3 to ensure that the distance between the top surface of a lower ejector rod 3c and the top surface of a press forming die 6 is the thickness of a layer of powder; then, sequentially performing powder paving and orderly arranging diamond particles; then operating the avoidance driving mechanism 4 to enable the layered prepressing device 5 to move until the second pressing head 5d is positioned right above the powder metallurgy part forming cavity, then operating the second driving assembly to enable the second pressing head 5d to be embedded into the powder metallurgy part forming cavity from top to bottom, prepressing and forming powder positioned in the powder metallurgy part forming cavity in the process, detecting a numerical value through a distance measuring sensor 5f to control the downward moving stroke of the second pressing head 5d, or controlling the rotating angle of a motor rotating shaft in a second motor screw rod nut assembly 5b to control the downward moving stroke of the second pressing head 5 d; finally, the first driving component of the lower ejector rod component 3 is controlled to enable the lower ejector rod 3c to move downwards, the second driving component is controlled to enable a layer of powder to be pre-pressed and formed to move downwards along with the lower ejector rod 3c, and the distance between the top surface of the powder and the top surface of the pressing forming die 6 is equal to the thickness of one layer of powder; after the powder filling cavity is formed, the second driving assembly is controlled to reset the second pressure head 5d and the avoiding driving mechanism 4 is operated to reset the layered pre-pressing device 5.

Secondly, completing the pre-pressing forming of the powder with the required layer number; and repeating the processes from the first step to the last step in sequence until the lower guide plate 3b abuts against the limiting backer.

Thirdly, extruding and forming to obtain a finished product; control the pneumatic cylinder 2a of going up pressure head subassembly 2, first pressure head 2c moves down, and first pressure head 2c imbeds the powder metallurgy spare from top to bottom and takes shape the intracavity, and the powder that the powder metallurgy spare takes shape the intracavity is extrudeed once more, and this time extrusion pressure is far greater than the extrusion pressure of second pressure head 5d to the powder.

Example two: as shown in fig. 5, the structure and principle of the present embodiment are substantially the same as those of the first embodiment, and the substantially same points are not described redundantly, but only different points are described, where: the pressure head mounting seat 5c is not provided with the distance measuring sensor 5f, but the upper end part of the second pressure head 5d penetrates through the pressure head mounting seat 5c, the pressure sensor 7 is arranged on the pressure head mounting seat 5c, the pressure sensor 7 and the second driving component are electrically connected with the control circuit, and the control circuit can control whether the second driving component continuously drives the second pressure head 5d to move downwards according to the measuring numerical value of the pressure sensor 7. In the next step, as the stroke of the second pressing head 5d embedded into the powder metallurgy part forming cavity is gradually increased, the pressure of the second pressing head 5d on the powder is also gradually increased, the pressure is monitored by the pressure sensor 7 in real time, and when the pressure reaches a set threshold value, the control circuit controls the second driving assembly to stop driving the second pressing head 5d to move downwards. The consistency of the density of each layer of powder is improved by controlling the consistency of the pressure of the powder.

Example three: the structure and principle of the present embodiment are substantially the same as those of the first embodiment, and the substantially same parts are not described redundantly, but only different parts are described, and the different parts are: the avoidance driving mechanism 4 connects the pre-pressing base 5a and the upper guide plate 2 b.

Claims

1. A powder metallurgy part compression forming machine comprises a machine frame (1) with a working table plate (1 a), a compression forming die (6) is fixed on the working table plate (1 a), an upper pressure head assembly (2) and a lower ejector rod assembly (3) are installed on the machine frame (1), and the upper pressure head assembly (2) is located above the working table plate (1 a); the powder metallurgy part pressing forming machine is characterized by further comprising an avoidance driving mechanism (4) and a layered pre-pressing device (5) positioned above the working platen (1 a), wherein the layered pre-pressing device (5) comprises a pre-pressing base (5 a) and a second pressing head (5 d), the avoidance driving mechanism (4) is connected with the pre-pressing base (5 a), the avoidance driving mechanism (4) can enable the second pressing head (5 d) to move to a position between the pressing forming die (6) and the upper pressing head component (2) and enable the second pressing head (5 d) to move to one side of the pressing forming die (6), the pre-pressing base (5 a) is provided with a second driving component connected with the second pressing head (5 d), when the second pressure head (5 d) is positioned between the press forming die (6) and the upper pressure head assembly (2), the second driving assembly can drive the second pressure head (5 d) to be embedded into the powder metallurgy part forming cavity of the press forming die (6) from top to bottom.

2. The powder metallurgy press-forming machine according to claim 1, wherein the avoiding driving mechanism (4) connects the pre-pressing base (5 a) with a work table (1 a) of the frame (1), or the avoiding driving mechanism (4) connects the pre-pressing base (5 a) with the upper ram assembly (2).

3. The powder metallurgy part press forming machine according to claim 2, wherein the avoiding driving mechanism (4) comprises a linear guide rail assembly (4 a) and a third motor screw nut assembly (4 b), the pre-pressing base (5 a) is connected with the workbench plate (1 a) through the linear guide rail assembly (4 a), a motor of the third motor screw nut assembly (4 b) is fixed on the workbench plate (1 a), and a nut is connected with the pre-pressing base (5 a);

or go up pressure head subassembly (2) including with frame (1) between be connected through first guide structure (2 d) last deflector (2 b), dodge actuating mechanism (4) including linear guide subassembly (4 a) and third motor lead screw nut subassembly (4 b), be connected through linear guide subassembly (4 a) between pre-compaction base (5 a) and last deflector (2 b), the motor of third motor lead screw nut subassembly (4 b) is fixed on last deflector (2 b), the screw is connected with pre-compaction base (5 a).

4. The powder metallurgy press-forming machine according to claim 1, wherein the press-forming die (6) has a plurality of powder metallurgy forming cavities, the number of the second rams (5 d) is the same as the number of the powder metallurgy forming cavities, and the second rams (5 d) can be arranged in one-to-one correspondence with the powder metallurgy forming cavities.

5. The powder metallurgy part press forming machine according to claim 1, 2, 3 or 4, wherein the prepressing base (5 a) is connected with a ram mounting seat (5 c) through a third guiding structure (5 e), the ram mounting seat (5 c) can move up and down, and the upper end part of the second ram (5 d) is fixed on the ram mounting seat (5 c).

6. The powder metallurgy press-forming machine according to claim 5, wherein the second driving assembly is a second motor screw nut assembly (5 b); the motor of the second motor screw rod and nut assembly (5 b) is installed on the prepressing base (5 a), and the nut is connected with the pressure head installation seat (5 c).

7. The powder metallurgy part press forming machine according to claim 5, wherein the layered pre-pressing device (5) further comprises a distance measuring sensor (5 f) for detecting the moving stroke of the second pressing head (5 d), the distance measuring sensor (5 f) and the second driving assembly are electrically connected with the control circuit, and the control circuit can control whether the second driving assembly continues to drive the second pressing head (5 d) to move downwards or not according to the measured value of the distance measuring sensor (5 f).

8. The powder metallurgy press forming machine according to claim 5, wherein the layered pre-pressing device (5) further comprises a pressure sensor (7) for detecting a pressure value applied to the second pressing head (5 d), the pressure sensor (7) and the second driving assembly are electrically connected with a control circuit, and the control circuit can control whether the second driving assembly continues to drive the second pressing head (5 d) to move downwards or not according to a measured value of the pressure sensor (7).

9. The powder metallurgy press forming machine according to claim 1 or 2 or 3 or 4, wherein the lower ejector rod assembly (3) comprises a first driving assembly and a lower ejector rod (3 c) embedded in a powder metallurgy forming cavity of the press forming die (6), and the first driving assembly can drive the lower ejector rod (3 c) to move up and down; the number of the lower ejector rods (3 c) is the same as that of the powder metallurgy part forming cavities, and the lower ejector rods (3 c) are arranged in one-to-one correspondence with the powder metallurgy part forming cavities.

10. The powder metallurgy part press forming machine according to claim 9, wherein the lower ejector rod assembly (3) further comprises a lower guide plate (3 b), the lower guide plate (3 b) is connected with the machine frame (1) through a second guide structure (3 d), and the lower ejector rod (3 c) is fixedly connected with the lower guide plate (3 b); the first driving assembly is a first motor screw and nut assembly (3 a), and a nut of the first motor screw and nut assembly (3 a) is connected with the lower guide plate (3 b).