A wet pressing mold cavity precision adjusting device

Abstract

This invention relates to the field of mold structure technology, specifically to a mold cavity precision adjustment device for a wet pressing mold, comprising: a punch; a bearing, wherein the punch is disposed on the bearing and extends into the mold cavity, and the lower mold is slidably connected to the bearing; and an adjustment mechanism, wherein the adjustment mechanism is disposed on the bearing and can adjust the axial position of the punch. By setting the adjustment mechanism, the axial position of several punches can be adjusted simultaneously and centrally, achieving a rapid adjustment effect and maintaining a stable position after adjustment. This differs from conventional adjustment methods that add shims or use adjusting screws, making the adjustment more efficient and preventing deformation or damage to components such as screw threads due to overpressure.

Description

Technical Field

[0001] This invention relates to the field of mold structure technology, and more specifically to a device for adjusting the cavity precision of a wet pressing mold. Background Technology

[0002] Currently, the tile-shaped permanent magnets in motors, i.e. magnetic tiles, are usually produced by pressing with a wet pressing mold. That is, the wet material of the magnetic tile is put into the mold cavity of the lower mold 2, and with the help of the punch 3 and the upper mold 1, the upper mold 1 and the lower mold 2 move down relative to the punch 3, so that the water in the wet material is gradually discharged from the insert 11 of the upper mold (through the water filter membrane) and pressed into shape.

[0003] However, as the production process progresses, the punch is prone to changes in axial travel due to surface wear and deformation. Changes in axial travel can easily lead to overpressure, causing the pressed magnetic tile to get stuck in the cavity (too short axial travel) or underpressure, resulting in insufficient pressing density of the magnetic tile (too long axial travel). Therefore, to address this issue, the punch needs to be maintained and adjusted regularly. The axial position of the punch can be adjusted by adding or removing shims or by adjusting screws. However, adding or removing shims requires adjusting each punch individually, and the thickness of the shims is sometimes difficult to meet the specific adjustment requirements. On the other hand, using adjusting screws can lead to deformation or jamming of the screw's thread structure in the working environment of the punch. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a cavity precision adjustment device for wet pressing molds, thereby solving the technical problem of inconvenient axial adjustment of the punch in existing technologies.

[0005] The technical solution adopted in this invention is a cavity precision adjustment device for a wet pressing mold, comprising: Punch head; The punch is located on the support and extends into the cavity of the mold, and the lower mold is slidably connected to the support. The device includes an adjustment mechanism located on the bearing seat and capable of adjusting the axial position of the punch.

[0006] This structure allows for convenient and quick adjustment of the punch position via an adjustment mechanism, achieving the desired processing effect.

[0007] The adjustment mechanism includes a drive device, a pumping device, and a synchronizer. There are several adjustment mechanisms, and each adjustment mechanism corresponds to and matches a row of punches. The drive device is mounted on a support, the pumping device is slidably mounted on the support and is connected to the drive device in a transmission manner, and the number of synchronizers is the same as the number of punches in a single row and they are connected one-to-one.

[0008] The driving device is a hydraulic cylinder.

[0009] This structure, driven by the drive unit and in conjunction with the extractor and synchronizer, can simultaneously adjust the position of multiple punches, better meeting the needs of punch position adjustment in different production batch environments, or satisfying the punch position compensation adjustment in different production cycles.

[0010] The pump includes a back plate, a long rod, and a first plug. The bearing has an oil cavity corresponding to the position of the punch. The long rod is slidably sealed to the bearing and coaxially passes through several oil cavities in the same row. The first plugs are disposed on the long rod and the number is the same as the number of oil cavities in the same row. Several first plugs are slidably sealed in the oil cavities one by one. One end of the long rod is connected to the back plate, and the back plate is drivenly connected to the drive device.

[0011] This structure, through the connection between the back plate and the drive unit, combined with the movement of the long rod and the first plug, can quickly extract hydraulic oil from the oil chamber or input it into the synchronizer, thereby achieving rapid adjustment and maintaining a stable state in the hydraulic environment, which is beneficial to the needs of stable production.

[0012] The synchronizer includes: a slide rod and a second plug body. The bearing has a movable cavity. The second plug body is slidably sealed in the movable cavity. The slide rod is concentrically connected to the second plug body and extends out of the movable cavity to connect with the punch. The first plug body divides the oil cavity to form two chambers. The chamber on the side of the oil cavity away from the drive device is connected to the adjacent movable cavity on the corresponding side and is completely filled with hydraulic oil.

[0013] This structure, through the extraction and adjustment of hydraulic oil in the movable chamber by the extractor, can quickly and effectively drive the slide bar as a whole through positive and negative pressure to achieve the effect of adjusting the position of the punch.

[0014] The oil circuit connecting the movable chamber and the oil chamber is equipped with a regulating valve, which can actively pump out the hydraulic oil in the corresponding oil chamber.

[0015] This structure allows for targeted adjustments to punches in different states after centralized adjustment, thereby improving adjustment accuracy. Since each punch has its own independent hydraulic path, the secondary adjustment can avoid affecting other punches while keeping the rod in place.

[0016] The slide bar is equipped with a safety valve assembly, which can limit the pressure that the punch can withstand.

[0017] The safety valve assembly includes: a two-way relief valve, a floating head, and an elastic reset member. A storage cavity is formed between the slide rod and the punch. The floating head is slidably sealed in the storage cavity. The elastic reset member is located in the storage cavity and can push the floating head to keep it downward. The two-way relief valve is located between the storage cavity and the movable cavity and forms a hydraulic circuit with the hydraulic oil in the movable cavity.

[0018] This structure can provide pressure protection for the punch, preventing the punch from deforming or the magnetic tile from getting stuck in the mold cavity due to excessive pressure during the stamping process after the upper mold closes.

[0019] Air vents are provided in the chamber on the other side of the oil cavity, the inner wall of the active cavity, and the upper side wall of the storage cavity.

[0020] This structure ensures stable air pressure within the corresponding chamber, guaranteeing the normal operation of the components.

[0021] As can be seen from the above technical solution, the beneficial technical effects of the present invention are as follows: 1. By adjusting the mechanism, the axial position of several punches can be adjusted synchronously and centrally to achieve a rapid adjustment effect and maintain a stable position after adjustment. This is different from the conventional adjustment method of adding shims or using adjusting screws. The adjustment is more efficient and can avoid deformation or damage to components such as screw threads due to overpressure.

[0022] 2. The regulating valve allows for a secondary adjustment of the axial position of individual punches based on their different states after the initial adjustment, thereby improving the adjustment accuracy.

[0023] 3. The safety valve assembly can further provide overpressure protection for the punch, preventing damage to the punch or the magnetic tile from being stuck in the cavity due to excessive pressure. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1 This is a schematic diagram of the overall structure of a mold cavity precision adjustment device for a wet pressing mold according to the present invention; Figure 2 This is an exploded view of the structure of a mold cavity precision adjustment device for a wet pressing mold according to the present invention; Figure 3 This is a structural cross-sectional view of a mold cavity precision adjustment device for a wet pressing mold according to the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the extractor of a mold cavity precision adjustment device for a wet pressing mold according to the present invention; Figure 6 This is a structural cross-sectional view of a mold cavity precision adjustment device for a wet pressing mold according to the present invention, specifically the adjustment mechanism part in the bearing.

[0026] Figure label: Upper mold 1, insert 11; Lower mold 2, cavity 21; Punch 3; Support 4; Adjustment mechanism 5, drive device 51, pump 52, back plate 521, long rod 522, first plug 523, oil chamber 524, synchronizer 53, slide rod 531, second plug 532, movable chamber 533; Control valve 6; Safety valve assembly 7, bidirectional relief valve 71, floating head 72, elastic reset element 73, storage chamber 74. Detailed Implementation

[0027] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0028] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0029] Example 1: like Figure 1-6 As shown, this embodiment provides a cavity precision adjustment device for a wet pressing mold, including: Punch 3; The bearing 4 and the punch 3 are located on the bearing 4 and extend into the cavity 21 of the mold. The lower mold 2 is slidably connected to the bearing 4. The adjustment mechanism 5 is located on the bearing 4 and can adjust the axial position of the punch 3.

[0030] The working principle of Example 1 is explained in detail below: In a static state, the punch 3 is mounted on the bearing 4 and extends into the cavity 21 of the lower mold 2 during die closing and stamping. It works with the insert 11 of the upper mold 1 to stamp the magnetic powder in the cavity 21. The number of punches 3 can be one or more. When it is necessary to adjust the axial position of the punches 3, such as to adapt to the production of magnetic tiles of different thicknesses, to adjust the punches 3 after wear, or to uniformly reset and adjust, the axial position of several punches 3 can be adjusted centrally and uniformly through the adjustment mechanism 5. The adjusted punches 3 will change their initial height in the cavity 21 to match the height dimension of the cavity 21 after the upper mold 1 and the lower mold 2 are closed, thereby achieving the effect of quickly adjusting the axial position of the punches 3.

[0031] The adjustment mechanism 5 includes a drive device 51, a pump 52, and a synchronizer 53. There are several adjustment mechanisms 5. Each adjustment mechanism 5 corresponds to and matches several punches 3 arranged in a row. The drive device 51 is located on the support 4. The pump 52 is slidably located on the support 4 and is connected to the drive device 51 in a transmission manner. The number of synchronizers 53 is the same as the number of punches 3 in a single row and they are connected one by one.

[0032] The drive unit 51 is a hydraulic cylinder.

[0033] In some achievable embodiments, the drive device 51 can control the puller 52 to move telescopically within the bearing 4 via the telescopic shaft. That is, the puller 52 drives several synchronizers 53 in the same row to achieve the effect of uniformly adjusting the axial height position of several punches 3, thereby improving the convenience of adjustment. In this embodiment, the drive device 51 is a hydraulic cylinder, which has good load-bearing capacity and static stability. In other embodiments, any device or structure with telescopic pushing capability, such as an electrically controlled telescopic rod, can also be used.

[0034] The extractor 52 includes a back plate 521, a long rod 522, and a first plug 523. The bearing 4 has an oil cavity 524 corresponding to the position of the punch 3. The long rod 522 is slidably and sealed to the bearing 4 and coaxially passes through several oil cavities 524 in the same row. The first plugs 523 are provided on the long rod 522 and the number is the same as the number of oil cavities 524 in the same row. Several first plugs 523 are slidably and sealed in the oil cavities 524 one by one. One end of the long rod 522 is connected to the back plate 521, and the back plate 521 is connected to the drive device 51.

[0035] Synchronizer 53 includes: slide rod 531 and second plug 532. The bearing 4 has a movable cavity 533. The second plug 532 is slidably sealed in the movable cavity 533. The slide rod 531 and the second plug 532 are concentrically connected and slidably sealed out of the movable cavity 533 and connected to the punch 3. The first plug 523 divides the oil cavity 524 to form two chambers. The chamber on the side of the oil cavity 524 away from the drive device 51 is connected to the adjacent movable cavity 533 on the corresponding side and is completely filled with hydraulic oil.

[0036] In some achievable embodiments, the back plate 521 can cooperate with the drive device 51 to connect multiple long rods 522 simultaneously, thereby simultaneously adjusting the positions of multiple rows of punches 3. When the long rod 522 is displaced by the traction of the drive device 51, it will generate positive and negative pressure in the oil chamber 524 through the first plug 523 according to the direction of movement, thereby driving the second plug 532 in the movable chamber 533. This achieves the effect of controlling the slide rod 531 to move up and down in the movable chamber 533 and adjusting the height position of the upper punch 3.

[0037] The movement of the first plug 523 is mainly controlled by the long rod 522, which in turn is mainly driven by the drive device 51. Therefore, under the limitation of the drive device 51 in a static state and the near incompressibility of the hydraulic oil itself, the stability of the position of the punch 3 after adjustment can be guaranteed, thus meeting production needs.

[0038] This adjustment method is more efficient than adding shims directly to the underside of the punch 3. It allows for head adjustment of several punches 3 in the same batch, meeting the needs of efficient production and maintenance. Compared to adjustment methods using screws or adjusting bolts, the hydraulic adjustment system can better avoid the large pressure environment of the punch 3 during operation, reducing the inconvenience of adjustment caused by component damage due to pressure or subsequent structural deformation.

[0039] Example 2: like Figure 2-3 As shown, the only difference in technical features compared to Embodiment 1 is that a regulating valve 6 is provided in the oil circuit connecting the movable cavity 533 and the oil cavity 524. The regulating valve 6 can actively pump out the hydraulic oil in the corresponding oil cavity 524.

[0040] Apart from that, all other structures are identical.

[0041] The working principle of Example 2 is explained in detail below: Furthermore, due to the different actual states of the punches 3 in different positions and processing environments, as well as the varying degrees of wear, the actual adjustment height of a small number of punches 3 may be slightly higher or lower than the overall axial height of the punches 3. Therefore, after the initial batch adjustment of the punches 3, hydraulic oil can be actively pumped into the oil chamber 524 through the regulating valve 6 according to the specific state of the punches 3, thereby achieving fine adjustment of the axial height position of the corresponding punches 3. The regulating valve 6 is a hydraulic high-pressure quick connector, which is a common type of connector in high-pressure hydraulic circuit systems. It can be connected to external hydraulic pipelines and pump out a certain amount of hydraulic oil through a hydraulic pump to achieve rapid adjustment and hydraulic circuit protection in the silent or working state to prevent leakage, while also meeting the needs of fine adjustment. In other embodiments, other structures can also be set to perform targeted fine adjustment of the hydraulic oil in the oil chamber 524, such as high-pressure valves.

[0042] Example 3: like Figure 3-4 As shown, the only technical feature that differs from Embodiment 1 is that the slide bar 531 is provided with a safety valve assembly 7, which can limit the pressure borne by the punch 3.

[0043] The safety valve assembly 7 includes: a two-way relief valve 71, a float head 72, and an elastic reset member 73. A storage cavity 74 is opened between the slide rod 531 and the punch 3. The float head 72 is slidably sealed in the storage cavity 74. The elastic reset member 73 is located in the storage cavity 74 and can push the float head 72 to keep it downward. The two-way relief valve 71 is located between the storage cavity 74 and the movable cavity 533 and forms a hydraulic circuit with the hydraulic oil in the movable cavity 533.

[0044] The working principle of Example 3 is explained in detail below: To protect the punch 3 and prevent excessive pressure from the upper die 1 during operation, which could cause deformation or scratches on the inner wall of the cavity 21, the hydraulic oil in the movable cavity 533 breaks through the static pressure of the two-way relief valve 71 and the elastic reset member 73 when the pressure is too high. At this time, the hydraulic oil will rush into the storage cavity 74. It is worth noting that to ensure that there is no air in the hydraulic system, the space between the float 72 and the two-way relief valve 71 in the storage cavity 74 is also completely filled with hydraulic oil. This can play a certain protective role when excessive pressure occurs, so that the punch 3 and the slide bar 531 move down the upper and lower dies 2 together synchronously. After the punch 3 loses downward pressure, the elastic reset member 73 pushes the float 72 to reset, so that the hydraulic oil temporarily stored in the storage cavity 74 is pumped back into the movable cavity 533, thereby restoring the position of the punch 3 and preventing its position from shifting and affecting production.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A device for adjusting the cavity precision of a wet-pressing mold, characterized in that, include: Punch (3); The punch (3) is located on the bearing (4) and extends into the cavity (21) of the lower mold (2). The lower mold (2) is slidably connected to the bearing (4). and adjustment mechanism (5), which is located on the bearing (4) and can adjust the axial position of the punch (3).

2. The mold cavity precision adjustment device for a wet pressing mold according to claim 1, characterized in that, The adjustment mechanism (5) includes a drive device (51), a pump (52) and a synchronizer (53). There are several adjustment mechanisms (5). Each adjustment mechanism (5) corresponds to and matches several punches (3) arranged in a row. The drive device (51) is located on the support (4). The pump (52) is slidably located on the support (4) and is connected to the drive device (51) in a transmission. The number of synchronizers (53) is the same as the number of punches (3) in a single row and they are connected one by one.

3. The mold cavity precision adjustment device for a wet pressing mold according to claim 2, characterized in that, The drive device (51) is a hydraulic cylinder.

4. The mold cavity precision adjustment device for a wet pressing mold according to claim 2, characterized in that, The pump (52) includes a back plate (521), a long rod (522) and a first plug (523). The bearing (4) has an oil cavity (524) corresponding to the position of the punch (3). The long rod (522) is slidably sealed to the bearing (4) and coaxially passes through several oil cavities (524) in the same row. The first plug (523) is provided on the long rod (522) and the number is the same as the number of oil cavities (524) in the same row. Several first plugs (523) are slidably sealed in the oil cavities (524) one by one. One end of the long rod (522) is connected to the back plate (521). The back plate (521) is connected to the drive device (51) in a transmission connection.

5. The mold cavity precision adjustment device for a wet pressing mold according to claim 4, characterized in that, The synchronizer (53) includes: a slide rod (531) and a second plug (532). The bearing (4) has a movable cavity (533). The second plug (532) is slidably sealed in the movable cavity (533). The slide rod (531) and the second plug (532) are concentrically connected and slidably sealed out of the movable cavity (533) and connected to the punch (3). The first plug (523) divides the oil cavity (524) to form two chambers. The chamber on the side of the oil cavity (524) away from the drive device (51) is connected to the adjacent movable cavity (533) on the corresponding side and is completely filled with hydraulic oil.

6. The mold cavity precision adjustment device for a wet pressing mold according to claim 5, characterized in that, The oil circuit connecting the active chamber (533) and the oil chamber (524) is equipped with a regulating valve (6), which can actively pump out the hydraulic oil in the corresponding oil chamber (524).

7. The mold cavity precision adjustment device for a wet pressing mold according to claim 5, characterized in that, The slide bar (531) is equipped with a safety valve assembly (7), which can limit the pressure borne by the punch (3).

8. The mold cavity precision adjustment device for a wet pressing mold according to claim 7, characterized in that, The safety valve assembly (7) includes: a two-way relief valve (71), a float (72) and an elastic reset member (73). A storage cavity (74) is opened between the slide rod (531) and the punch (3). The float (72) is slidably sealed in the storage cavity (74). The elastic reset member (73) is located in the storage cavity (74) and can push the float (72) to keep it downward. The two-way relief valve (71) is located between the storage cavity (74) and the movable cavity (533) and forms a hydraulic circuit with the hydraulic oil in the movable cavity (533).

9. The mold cavity precision adjustment device for a wet pressing mold according to claim 8, characterized in that, Air holes are provided on the inner wall of the chamber on the other side of the oil cavity (524), the upper wall of the active cavity (533), and the upper wall of the storage cavity (74).

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