Mould-frame-free magnet pressing device

Abstract

The utility model belongs to the technical field of forming presses, and particularly relates to a mold-frame-free magnet pressing device. A die-frame-free magnet pressing device comprises a lower punching core rod and a die arranged on the outer side of the lower punching core rod in the circumferential direction in a sleeving mode, the outer wall of the lower punching core rod in the circumferential direction is in contact fit with the inner wall of the die in the circumferential direction, and the upper end of the lower punching core rod and the upper end of the die are not in contact and define a discharging groove with an upward opening. The lower punch and the upper side of the die are provided with an upper punch which is movably matched, the upper punch is provided with an upper punch protrusion which extends downwards and extends into the discharging groove, the upper punch protrusion is in contact fit with the two radial side walls of the discharging groove, and a cavity used for pressing magnet powder is defined between the upper punch protrusion and the discharging groove. The utility model has the advantages that the upper punch, the die and the lower punch core rod are coaxially arranged through the direct positioning fit of the upper punch, the die and the lower punch core rod, are not required to be fixed with a die frame, are convenient to install and are not required to be positioned through the die frame.

Description

Technical Field

[0001] The utility model belongs to the technical field of molding presses, and in particular relates to a magnet pressing device without a mold frame. Background Art

[0002] At present, the molding press used for pressing magnets (such as NdFeB magnets) mainly includes a die frame and an upper punch, a die and a lower punch fixed on the die frame. For example, the Chinese patent application number 201610133937.5 discloses a NdFeB powder molding press, in which the upper punch, the die and the lower punch are arranged on the die frame (frame), and the upper punch, the die and the lower punch are installed and positioned by the die frame to ensure that the three are arranged coaxially; the die is fixed and located between the upper punch and the lower punch, and the upper punch of the upper punch and the lower punch of the lower punch will move toward the die and press the NdFeB powder filled in the die.

[0003] However, when the size of the product to be pressed is large, a larger upper punch, mold and lower punch are required for pressing, and the required press has a large tonnage, is rarely available on the market, and there is even no dedicated mold frame available. If a mold frame is customized without a reserved installation position, the guidance and installation cannot guarantee accuracy. For example, the larger upper punch, mold and lower punch are heavier, making it more troublesome to disassemble and assemble the upper punch, mold and lower punch with the mold frame, and the processing and assembly accuracy are difficult to control, resulting in difficulty in ensuring the coaxial setting between the upper punch, mold and lower punch after they are installed with the mold frame, resulting in the pressed product not meeting the requirements. Therefore, a structural design that can meet the rapid prototyping and production of large products on equipment without a mold frame is particularly important. Utility Model Content

[0004] The utility model aims to provide a magnet pressing device without a mold frame, in which an upper punch, a mold and a lower punch do not need to be fixed to a mold frame.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a mold-free magnet pressing device, comprising a fixed lower punch rod and a mold sleeved on the circumferential outer side of the lower punch rod, the circumferential outer wall of the lower punch rod contacts and cooperates with the circumferential inner wall of the mold so that the mold and the lower punch rod are coaxially arranged, the mold can move relative to the lower punch rod along the axial direction of the lower punch rod, the upper end of the lower punch rod does not contact the upper end of the mold and encloses to form an upwardly open discharge trough, the upper side of the lower punch and the mold is provided with a movably matched upper punch, the upper punch is provided with an upper punch protrusion extending downward and extending into the discharge trough, the upper punch protrusion contacts and cooperates with the radial side walls of the discharge trough, and the upper punch protrusion and the discharge trough are enclosed to form a cavity for pressing magnet powder.

[0006] When assembling this solution, first place the lower punch on the workbench, then put the mold on the outside of the lower punch so that the mold and the lower punch are coaxially arranged, then put the magnetic powder to be pressed into the discharge trough, and place the upper punch cover above the mold and the lower punch so that the upper punch protrusion extends into the discharge trough, start the upper press, and press the upper punch down to press the magnetic powder in the cavity. After the magnetic powder is pressed, the mold moves axially downward relative to the lower punch so that the molded magnetic powder product is higher than the upper end of the mold, and finally the upper punch is taken out and the molded magnetic powder product is taken out, and the mold moves axially upward to reset to press the next magnetic powder.

[0007] This solution realizes the positioning between the inner wall of the mold and the outer wall of the lower punch core rod by contacting the two to ensure the coaxial setting between the two, and realizes the positioning between the upper punch, the mold and the lower punch core rod by contacting the upper punch protrusion with the radial side walls of the discharge groove (the inner wall of the upper end of the mold and the outer wall of the upper end of the lower punch core rod). And the mold can be moved up and down in the axial direction to complete the reset and demoulding of the product. Compared with the conventional mold with a mold frame, this device is simpler to assemble and convenient for processing and manufacturing, and can avoid the problem of poor positioning effect of the upper punch, mold and lower punch core rod after being fixed to the mold frame.

[0008] Preferably, at least three drivers are provided at the lower end of the mold, which are arranged in a circular shape with the center of the punch rod as the center and are evenly spaced apart. The mold moves in the axial direction under the action of the drivers.

[0009] The mold is reset and the product is demoulded through the driver.

[0010] Preferably, the driver is a cylinder.

[0011] The cylinder is not rigidly retractable, so it can better withstand the load of the press above and can be used for a long time.

[0012] Preferably, the lower end of the mold is provided with a plurality of positioning holes which are open downward and are arranged in a circular shape with the center of the lower punch rod as the center and are evenly spaced apart, and the output end of the driver extends into the positioning holes.

[0013] The output end of the driver can be positioned through the positioning holes to ensure that the mold is evenly stressed and avoid tilting of the mold.

[0014] Preferably, a radially outwardly extending annular protrusion is provided in the middle portion of the lower punch rod, and the upper end surface of the annular protrusion is the bottom surface of the discharge groove; when the mold is located circumferentially outside the lower punch rod, the circumferential outer wall of the annular protrusion contacts the circumferential inner wall of the mold, and the circumferential outer wall of the lower end of the lower punch rod does not contact the circumferential inner wall of the lower end of the mold.

[0015] The contact between the annular protrusion and the mold realizes the positioning and cooperation between the mold and the lower punch rod; at the same time, due to processing problems, in order to avoid processing deviations and inaccurate positioning, the circumferential outer wall of the lower end of the lower punch rod does not contact the circumferential inner wall of the lower end of the mold.

[0016] Preferably, the lower punch rod is supported on a plurality of stacked pads, and the height of the pads determines the depth of the discharge groove along the axial direction.

[0017] The lower punch rod is supported on the pads. When the number of pads is small, the position of the lower punch rod relative to the mold is lower, so that the depth of the discharge trough becomes larger; when the number of pads is large, the position of the lower punch rod relative to the mold is higher, so that the depth of the discharge trough becomes smaller; thus, it can be suitable for pressing products with different magnetic powder contents.

[0018] Preferably, the upper punch is provided with a support portion extending radially outward; when the magnet powder is pressed, the lower end of the support portion is not in contact with the upper end of the mold.

[0019] By providing the support part, the contact area between the upper punch and the press can be increased during pressing, thereby increasing the service life of the upper punch and facilitating the placement and removal of the upper punch and observation of the pressing condition.

[0020] The utility model has the advantages of realizing coaxial arrangement of the upper punch, the die and the lower punch core rod through direct positioning cooperation among the upper punch, the die and the lower punch core rod, and does not need to be fixed to the die frame, thereby solving the problem of installation difficulties and difficulty in ensuring accuracy after the die frame is installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Figure 2 It is a schematic diagram of the structure of the utility model after removing the upper punch.

[0023] Figure 3 for Figure 1 sectional view of .

[0024] Figure 4 It is a cross-sectional view of the utility model during demoulding.

[0025] Figure numbers: 1, upper punch; 11, supporting part; 12, upper punch protrusion; 2, mold; 21, positioning hole; 3, lower punch core rod; 31, annular protrusion; 4, cylinder; 5, cushion block; 6, discharge trough; 61, cavity. DETAILED DESCRIPTION

[0026] The utility model is further described below based on the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 3 As shown, this embodiment discloses a mold-free magnet pressing device, including a lower punch rod 3 supported and fixed on a cushion block 5, and the cushion block 5 is stacked; the mold 2 is provided with a through hole that penetrates axially and is arranged with equal diameters, and the mold 2 is sleeved on the circumferential outer side of the lower punch rod 3. The middle end of the lower punch rod 3 is provided with an annular protrusion 31 that extends radially outward and is annular, and the circumferential outer wall of the annular protrusion 31 contacts and cooperates with the circumferential inner wall of the mold 2. The upper circumferential outer wall of the lower punch rod 3 does not contact the circumferential inner wall of the upper end of the mold 2, and the annular protrusion 31, the lower punch rod 3 and the mold 2 are enclosed to form a material discharge groove 6 that opens upward. An upper punch 1 that is movably connected is provided on the upper side of the mold 2 and the lower punch rod 3, and the upper punch 1 includes a support portion 11 that extends radially outward and an annular upper punch protrusion 12 that extends axially downward and is used to extend into the material discharge groove 6, and the upper punch protrusion 12 contacts and cooperates with the radial side walls of the material discharge groove 6. The upper punch protrusion 12 and the discharge groove 6 enclose a cavity 61 for pressing the magnet powder. The circumferential outer wall of the lower end of the lower punch core rod 3 is not in contact with the circumferential inner wall of the lower end of the mold 2.

[0028] like Figure 3 and Figure 4 As shown, four positioning holes 21 are arranged at the lower end of the mold 2 with the center of the lower punch rod 3 as the center of the circle and are evenly spaced in an annular manner, and the positioning holes 21 open downward. A driver is provided at the lower end of the mold 2 to drive the mold 2 to move axially relative to the lower punch rod 3. The driver is a cylinder 4, and the output end of the cylinder 4 extends into the positioning hole 21.

[0029] When the magnet powder is pressed, the cushion block 5 is first placed on the workbench of the press (not shown in the figure), then the lower punch core rod 3 is placed on the cushion block 5, the four cylinders 4 are placed at the set position and extended upward, and then the mold 2 is supported on the output end of the cylinder 4 so that the output end of the cylinder 4 extends into the positioning hole 21. Then the weighed magnet powder is poured into the discharge trough 6, and the upper punch 1 is covered on the mold 2 so that the upper punch protrusion 12 extends into the discharge trough 6, and then the press is started so that the press presses down the upper punch 1. After the pressing is completed, the press rises, and the annular iron block (not shown in the figure) is sleeved on the circumferential outer side of the upper punch 1 and supported on the upper end surface of the mold 2, and then the press is started again to press down, and at the same time the cylinder 4 is deflated, so that the mold 2 descends, so that the magnet powder after pressing is higher than the upper end of the mold 2. Then the press is reset, and the operator takes out the upper punch 1 and the pressed magnet powder. Finally, the cylinder 4 is inflated and the mold 2 is reset to press the next magnet powder.

Claims

1. A moldless magnet pressing device, characterized in that: It includes a fixed lower punch rod and a mold sleeved on the circumferential outer side of the lower punch rod, the circumferential outer wall of the lower punch rod contacts and cooperates with the circumferential inner wall of the mold so that the mold and the lower punch rod are coaxially arranged, and the mold can move relative to the lower punch rod along the axial direction of the lower punch rod, the upper end of the lower punch rod and the upper end of the mold do not contact and enclose a discharge groove opening upward, the upper side of the lower punch and the mold is provided with a movably matched upper punch, the upper punch is provided with an upper punch protrusion extending downward and extending into the discharge groove, the upper punch protrusion contacts and cooperates with the radial side walls of the discharge groove, and the upper punch protrusion and the discharge groove enclose a cavity for pressing magnet powder.

2. The moldless magnet pressing device according to claim 1, characterized in that: The lower end of the mold is provided with at least three drivers which are arranged in a circular shape with the center of the punch rod as the center and are evenly spaced. The mold moves in the axial direction under the action of the drivers.

3. The moldless magnet pressing device according to claim 2, characterized in that: The driver is a cylinder.

4. The moldless magnet pressing device according to claim 2, characterized in that: The lower end of the mold is provided with a plurality of positioning holes which are open downwards and are arranged in a circular shape with the center of the lower punch rod as the center and are evenly spaced. The output end of the driver extends into the positioning hole.

5. The moldless magnet pressing device according to any one of claims 1 to 4, characterized in that: A radially outwardly extending annular protrusion is provided in the middle portion of the lower punch rod, and the upper end surface of the annular protrusion is the bottom surface of the material discharge groove; when the mold is located circumferentially outside the lower punch rod, the circumferential outer wall of the annular protrusion contacts the circumferential inner wall of the mold, and the circumferential outer wall of the lower end of the lower punch rod does not contact the circumferential inner wall of the lower end of the mold.

6. The moldless magnet pressing device according to any one of claims 1 to 4, characterized in that: The lower punch rod is supported on a plurality of stacked cushion blocks, and the height of the cushion blocks determines the depth of the discharge groove along the axial direction.

7. The moldless magnet pressing device according to any one of claims 1 to 4, characterized in that: The upper punch is provided with a support portion extending radially outward; when the magnet powder is pressed, the lower end of the support portion is not in contact with the upper end of the mold.

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