A multi-cavity powder molding equipment and control method

Abstract

This invention discloses a multi-cavity powder molding equipment and its control method. The multi-cavity powder molding equipment includes a mold frame, an upper mold assembly disposed above the mold frame, and a lower mold assembly disposed below the mold frame. The upper mold assembly includes an upper mold base and an upper mold component disposed on the upper mold base. The lower mold assembly includes a lower mold base and a lower mold component disposed on the lower mold base. The mold frame has multiple mold cavities and also includes a distribution assembly connected between the upper mold base and the upper mold component. The distribution assembly includes a connecting member. The upper mold base can transmit force to the connecting member, and the connecting member can distribute the force to the multiple upper mold components. The control method is used to control the multi-cavity powder molding equipment as described above. Using this invention, the total pressure can be finely distributed, allowing for flexible adjustment of the pressure in each mold cavity, thereby improving the molding quality.

Description

Technical Field

[0001] This invention relates to the field of molding equipment technology, and in particular to a multi-cavity powder molding equipment and control method. Background Technology

[0002] The drive structure of existing powder pressing equipment mainly includes an electrical control system, a hydraulic or pneumatic transmission system, and a mechanical actuator. The electrical control system can adjust the output of the hydraulic or pneumatic transmission system, which in turn applies pressing pressure to the powder inside the mold cavity via the mechanical actuator (such as the upper mold). While the electrical control system can precisely control the total output pressure of the hydraulic or pneumatic system, in multi-cavity systems, because there are multiple mold frames and corresponding upper molds, the electrical control system can usually only drive the upper mold base connecting multiple upper molds. It is difficult to refine the specific pressure distribution to each individual upper mold, which can easily lead to large deviations in pressure values ​​between different mold cavities. This is especially problematic in fields where the powder requires high pressure accuracy, or where the molding pressure is high and close to the limits of the mold material. Large pressure deviations can seriously affect the molding quality of the powder and may even damage the mold. Furthermore, it is not conducive to adaptive adjustments for different materials and process requirements. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a multi-cavity powder molding equipment that can finely distribute the total pressure and flexibly adjust the pressure of each cavity, thereby improving the molding quality.

[0004] To solve the above-mentioned technical problems, the present invention provides a multi-cavity powder forming device, including a mold frame, an upper mold assembly disposed above the mold frame, and a lower mold assembly disposed below the mold frame. The upper mold assembly includes an upper mold base and an upper mold component disposed on the upper mold base. The lower mold assembly includes a lower mold base and a lower mold component disposed on the lower mold base. The mold frame is provided with a plurality of mold cavities, and the position and number of the upper mold components correspond to the position and number of the mold cavities.

[0005] It also includes a distribution component connected between the upper mold base and the upper mold pieces. The distribution component includes a connector, the upper mold base is movably connected to the connector, and a plurality of the upper mold pieces are movably connected to the connector. The upper mold base can transmit force to the connector, and the connector can distribute force to the plurality of the upper mold pieces.

[0006] As an improvement to the above solution, the connecting component includes a hydraulic cylinder and a plunger rod corresponding to the hydraulic cylinder. The bottom of the upper mold base is provided with multiple hydraulic cylinders, each containing hydraulic oil. The plunger rod is vertically arranged, and the plunger rods corresponding to the multiple hydraulic cylinders are respectively connected to multiple upper mold components. The upper mold base can drive the upper mold components to move through the hydraulic cylinders and the plunger rods.

[0007] As an improvement to the above solution, the distribution component further includes a connecting pipe, through which the plurality of oil cylinders are interconnected to make the pressure in the plurality of oil cylinders equal.

[0008] As an improvement to the above solution, the inner diameters of the multiple hydraulic cylinders are equal, or the inner diameters of two adjacent hydraulic cylinders are set according to a preset ratio.

[0009] As an improvement to the above solution, the connecting member includes a connecting rod and a crossbar. The upper part of the connecting rod is fixedly connected to the upper mold base, and the lower part of the connecting rod is hinged to the crossbar. The crossbar is horizontally arranged, and the upper part of the upper mold component is hinged to the crossbar. Two or more upper mold components are distributed at intervals along the crossbar.

[0010] As an improvement to the above solution, the connecting rod is hinged to the middle of the crossbar, and the upper mold is symmetrically arranged on both sides of the connecting rod.

[0011] As an improvement to the above solution, the position of the connecting rod is offset from the middle of the crossbar.

[0012] The present invention also provides a control method for controlling the multi-cavity powder forming equipment as described above, comprising the following steps: inputting the preset pressing pressure of each cavity;

[0013] When the pressing pressure of each mold cavity is equal, the inner diameter of the cylinder corresponding to each mold cavity is equal, or the upper mold parts on the crossbar are symmetrically arranged on both sides of the connecting rod, and then the upper mold base is driven to directly drive the upper mold parts to press down.

[0014] When the pressing pressure of each mold cavity is not equal, change the inner diameter specification of the corresponding cylinder in the connector or adjust the position of the connecting rod relative to the crossbar in the connector so that the pressing pressure of each upper mold part reaches the preset requirement.

[0015] As an improvement to the above solution, the step of changing the inner diameter specification of the corresponding hydraulic cylinder in the connecting component includes:

[0016] Set the standard pressing pressure F0 and the standard cylinder inner diameter d0;

[0017] With the preset pressing pressure of the current mold cavity as F1, the ratio of the preset pressing pressure to the standard pressing pressure, F1 / F0, is obtained. Then, the diameter of the hydraulic cylinder that needs to be replaced at the corresponding position in the current mold cavity satisfies d1. 2 =d0 2 *F1 / F0.

[0018] As an improvement to the above solution, the step of adjusting the position of the connecting rod relative to the crossbar in the connecting member includes:

[0019] The upper molds symmetrically arranged on both sides of the connecting rod are the first upper mold and the second upper mold, respectively. The distance between the first upper mold and the connecting rod is set to L1, and the distance between the second upper mold and the connecting rod is set to L2.

[0020] With the preset pressing pressure of the mold cavity corresponding to the first upper mold part as T1 and the preset pressing pressure of the mold cavity corresponding to the second upper mold part as T2, adjust the position of the connecting rod relative to the crossbar so that L2 = L1 * T1 / T2.

[0021] Implementing this invention has the following beneficial effects:

[0022] The multi-cavity powder molding equipment of the present invention includes a mold frame, an upper mold assembly, a lower mold assembly, and a distribution assembly. The mold frame has multiple mold cavities. The position and number of upper mold parts of the upper mold assembly correspond to the position and number of mold cavities, and are used for multi-cavity molding operations. The distribution assembly includes a connector. The upper mold base is movably connected to the connector. Multiple upper mold parts are movably connected to the connector. The upper mold base can transmit force to the connector, and the connector can distribute force to the multiple upper mold parts, thereby achieving fine pressure distribution and allowing the pressure of each mold cavity to be flexibly adjusted, thereby improving molding quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the multi-cavity powder forming equipment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the first embodiment of the distribution component of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the second embodiment of the distribution component of the present invention;

[0026] Figure 4 This is a flowchart illustrating the control method of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside, and outside used in this text are based solely on the accompanying drawings and are not intended to specifically limit the invention.

[0028] See Figure 1 and Figure 2 This invention discloses a multi-cavity powder forming device, including a mold frame 1, an upper mold assembly 2 disposed above the mold frame 1, and a lower mold assembly 3 disposed below the mold frame 1. The upper mold assembly 2 includes an upper mold base 21 and an upper mold member 22 disposed on the upper mold base 21. The upper mold base 21 can drive the upper mold member 22. The upper mold member 22 contacts the powder to press the powder. Traditional powder forming devices usually connect the upper mold base 21 to a driving device. The driving device can only control the overall force of the upper mold base 21 and cannot control the force of each upper mold member 22. The lower mold assembly 3 includes a lower mold base 31 and a lower mold member 32 disposed on the lower mold base 31. The mold frame 1 has multiple mold cavities 11. The position and number of the upper mold members 22 correspond to the position and number of the mold cavities 11, and can be used to form powder in multiple mold cavities 11.

[0029] In this embodiment of the invention, in order to precisely distribute the pressure to each upper mold part 22, the multi-cavity powder molding equipment further includes a distribution component 4. The distribution component 4 is connected between the upper mold base 21 and the upper mold part 22, and can transmit the force of the upper mold base 21 to the upper mold part 22. The distribution component 4 includes a connector 41, the upper mold base 21 is movably connected to the connector 41, and multiple upper mold parts 22 are movably connected to the connector 41. The upper mold base 21 can transmit the force to the connector 41, and the connector 41 can distribute the force to multiple upper mold parts 22. The connector 41 can distribute the force to each upper mold part 22, thereby achieving precise distribution. Moreover, by adjustment, the pressure of each mold cavity 11 can be different to adapt to different material and process requirements, and the pressing pressure can be flexibly adjusted to improve the molding quality.

[0030] The beneficial effects of the embodiments of the present invention are as follows:

[0031] The multi-cavity powder molding equipment of this invention includes a mold frame 1, an upper mold assembly 2, a lower mold assembly 3, and a distribution assembly 4. The mold frame 1 has multiple mold cavities 11. The position and number of upper mold parts 22 of the upper mold assembly 2 correspond to the position and number of mold cavities 11, and are used for the molding operation of the multi-cavity 11. The distribution assembly 4 includes a connector 41. The upper mold base 21 is movably connected to the connector 41. Multiple upper mold parts 22 are movably connected to the connector 41. The upper mold base 21 can transmit the force to the connector 41, and the connector 41 can distribute the force to the multiple upper mold parts 22, thereby achieving fine pressure distribution and allowing the pressure of each mold cavity 11 to be flexibly adjusted, thereby improving the molding quality.

[0032] See Figure 2 In the first embodiment, a hydraulic cylinder 411 is used to control the pressure distribution of the upper mold member 22. Specifically, the connecting member 41 includes a hydraulic cylinder 411 and a plunger rod 412 corresponding to the hydraulic cylinder 411. The hydraulic cylinder 411 contains hydraulic oil, which controls the force of the plunger rod 412, thereby controlling the force of the upper mold member 22. The bottom of the upper mold base 21 is provided with multiple hydraulic cylinders 411, and the plunger rods 412 are vertically arranged. The plunger rods 412 corresponding to the multiple hydraulic cylinders 411 are respectively connected to multiple upper mold members 22. Each upper mold member 22 corresponds to a different hydraulic cylinder 411. The upper mold base 21 can drive the upper mold member 22 to move through the hydraulic cylinders 411 and the plunger rods 412. Therefore, each hydraulic cylinder 411 can control the pressing pressure of each upper mold member 22, thereby achieving precise force distribution.

[0033] Furthermore, in the first embodiment, the distribution component 4 further includes a connecting pipe 42, through which the plurality of oil cylinders 411 are interconnected. Utilizing the principle of communicating vessels, different oil cylinders 411 are connected through the connecting pipe 42, thereby making the pressure in the plurality of oil cylinders 411 equal.

[0034] Traditional powder forming equipment uses a single upper mold base 21 to distribute pressure to multiple upper mold parts 22. The upper mold base 21 and the upper mold parts 22 are rigidly connected. The force transmission method of the upper mold base 21 is "rigid" transmission. This rigid transmission has obvious disadvantages. When there are factors such as assembly errors, material differences, wear differences of upper mold parts 22, and temperature differences, the force transmitted by the upper mold base 21 cannot be evenly transmitted to each upper mold part 22. Therefore, when differentiated transmission is required, it is not possible to accurately adjust the force difference in each upper mold part 22, resulting in the pressed finished product quality not matching the expected quality. In the first embodiment, the hydraulic oil in the cylinder 411 is used to balance the pressure in each of the upper mold parts 22, which can achieve the effect of "flexible" transmission. This flexible transmission can ensure that the difference in force between each upper mold part 22 can be quickly and "flexibly" adjusted, and it is self-adjusting, fast and accurate. When differentiated transmission is required, the force of different upper mold parts 22 can also be made different by adjusting the specifications of the cylinder 411, and this adjustment effect is also fast and accurate.

[0035] When balanced force is required, the inner diameters of the multiple hydraulic cylinders 411 are equal. Since the pressure inside each hydraulic cylinder 411 is equal, when the inner diameters of the hydraulic cylinders 411 are equal, the force driving the plunger rod 412 is equal, thereby making the pressing pressure of each upper mold 22 equal, achieving the effect of uniform pressure distribution.

[0036] When it is necessary to differentiate the pressing pressure of different upper mold parts 22, the inner diameters of two adjacent cylinders 411 can be set according to a preset ratio to obtain upper mold parts 22 with different pressing pressures. For example, in two adjacent cylinders 411, the diameter of the first cylinder 411 is 4r and the diameter of the second cylinder 411 is 2r. Thus, the cross-sectional area of ​​the inner cavity of the first cylinder 411 is 4πr*r, and the cross-sectional area of ​​the inner cavity of the second cylinder 411 is πr*r. The cross-sectional area of ​​the inner cavity of the first cylinder 411 is 4 times that of the inner cavity of the second cylinder 411. Since the pressure in the inner cavities of the first cylinder 411 and the second cylinder 411 is equal, when transmitting power, the pressing pressure obtained by the upper mold part 22 corresponding to the first cylinder 411 is 4 times that of the upper mold part 22 corresponding to the second cylinder 411. By changing the specifications of different hydraulic cylinders 411, the pressing pressure of the upper mold part 22 corresponding to different hydraulic cylinders 411 can be adjusted, thereby achieving a fine adjustment effect.

[0037] See Figure 3In the second embodiment, a linkage control method is used to distribute pressure to the upper mold member 22. Specifically, the connecting member 41 includes a connecting rod 413 and a crossbar 414. The upper part of the connecting rod 413 is fixedly connected to the upper mold base 21, and the force of the upper mold base 21 can be directly transmitted to the connecting rod 413. The lower part of the connecting rod 413 is hinged to the crossbar 414. The crossbar 414 is horizontally arranged, and the upper part of the upper mold member 22 is hinged to the crossbar 414. Two or more upper mold members 22 are distributed at intervals along the crossbar 414.

[0038] In use, the upper mold base 21 transmits the force to the connecting rod 413, which then distributes the force to each of the upper mold components 22 via the crossbar 414. Since the crossbar 414 and the connecting rod 413 are hinged, the force transmission between them is also "flexible." In this flexible transmission, if the force on one of the upper mold components 22 located on one side of the connecting rod 413 is greater, its reaction force is also greater, driving the upper mold component 22 on the other side of the connecting rod 413 to move towards further pressing the powder, thereby increasing the force on that upper mold component 22. This balances the forces on both sides of the connecting rod 413, resulting in a fine distribution of pressure. Multiple crossbars 414 can be present, all hinged to the connecting rod 413.

[0039] When force balance is required, the connecting rod 413 is hinged to the middle of the crossbar 414, and the upper mold members 22 are symmetrically arranged on both sides of the connecting rod 413. At this time, the distance between the upper mold members 22 on both sides of the connecting rod 413 and the connecting rod 413 is equal. Since the torques generated by the two upper mold members 22 on the crossbar 414 are opposite in direction but equal in magnitude, the forces generated by the two upper mold members 22 are equal.

[0040] When it is necessary to differentiate the pressing pressure of different upper mold parts 22, the position of the connecting rod 413 is offset from the middle of the crossbar 414. At this time, the distance between the upper mold parts 22 on both sides of the connecting rod 413 and the connecting rod 413 is not equal. In order to achieve force balance, the torques generated by the two upper mold parts 22 on the crossbar 414 are opposite in direction but equal in magnitude. Therefore, the forces generated by each upper mold part 22 are not equal, thus generating differentiated adjustment. The accuracy of the adjustment depends on the accuracy of the position adjustment of the connecting rod 413.

[0041] See Figure 4 The present invention also discloses a control method for controlling the multi-cavity powder forming equipment as described above, comprising the following steps:

[0042] S01, Input the preset pressing pressure for each mold cavity 11;

[0043] S02, when the pressing pressure of each mold cavity 11 is equal, the inner diameter of the cylinder 411 corresponding to each mold cavity 11 is equal or the upper mold part 22 located on the crossbar 414 is symmetrically arranged on both sides of the connecting rod 413, and then the upper mold base 21 is driven to directly drive the upper mold part 22 to press down.

[0044] S02` When the pressing pressure of each mold cavity 11 is not equal, change the inner diameter specification of the corresponding oil cylinder 411 in the connector 41 or adjust the position of the connecting rod 413 in the connector 41 relative to the crossbar 414 so that the pressing pressure of each upper mold part 22 reaches the preset requirement.

[0045] Initially, based on the powder material and process conditions that each mold cavity 11 needs to press, the preset pressing pressure of each mold cavity 11 is input so as to facilitate fine adjustment of the pressure of each mold cavity 11.

[0046] In the first embodiment, the initial state of the multi-cavity powder forming equipment of the present invention is that the inner diameter of the cylinder 411 corresponding to each cavity 11 is equal. Since each cylinder 411 is connected by a connecting pipe 42, the pressure in each cylinder 411 is equal. When the inner diameter of each cylinder 411 is equal, the force generated by the plunger rod 412 acting on the cylinder 411 will be equal, that is, the force of each upper mold 22 is equal.

[0047] When the pressing pressure of each mold cavity 11 is equal, there is no need to change the specifications of the oil cylinder 411. The upper mold base 21 is driven in the initial state to directly drive the upper mold part 22 to press down, so that multiple upper mold parts 22 can obtain equal pressing pressure.

[0048] When the pressing pressure of each mold cavity 11 is not equal, it is necessary to adjust the pressing pressure of different upper mold parts 22 differently. At this time, the inner diameter of the cylinder 411 corresponding to the upper mold part 22 that needs to be pressed with different pressures is changed in the connecting piece 41. Since the pressure in each cylinder 411 is equal, when the inner diameter of the cylinder 411 is different, the driving force of the hydraulic oil in the cylinder 411 on the upper mold part 22 is different, thereby generating different pressing pressures.

[0049] In the second embodiment, the initial state of the multi-cavity powder forming equipment of the present invention is that the upper mold members 22 on the crossbar 414 are symmetrically arranged on both sides of the connecting rod 413. The upper mold members 22 symmetrically arranged on both sides of the connecting rod 413 are the first upper mold member 221 and the second upper mold member 222, respectively. The distance from the first upper mold member 221 to the connecting rod 413 and the distance from the second upper mold member 222 to the connecting rod 413 are equal. At this time, the pressing pressure of the first upper mold member 221 and the second upper mold member 222 is equal. There can be multiple crossbars 414, and multiple crossbars 414 are simultaneously hinged to the connecting rod 413. The multiple crossbars 414 can be located on the same horizontal plane or on different horizontal planes. Each crossbar 414 has an upper mold member 22 at both ends, and two upper mold members 22 are respectively arranged on both sides of the connecting rod 413.

[0050] When the pressing pressure of each mold cavity 11 is equal, there is no need to adjust the distance between the upper mold 22 and the connecting rod 413. That is, the connecting rod 413 is kept in the initial position, and the upper mold base 21 is driven in the initial state to directly drive the upper mold 22 to press down, so that multiple upper molds 22 can obtain equal pressing pressure.

[0051] When the pressing pressure of each mold cavity 11 is not equal, the position of the connecting rod 413 in the connecting member 41 relative to the crossbar 414 is adjusted, thereby changing the distance from the first upper mold member 221 to the connecting rod 413 and the distance from the second upper mold member 222 to the connecting rod 413, so that the distance from the first upper mold member 221 to the connecting rod 413 is not equal to the distance from the second upper mold member 222 to the connecting rod 413. According to the principle of equal torque, the forces applied in the first upper mold member 221 and the second upper mold member 222 are not equal, thereby obtaining different pressing pressures.

[0052] The step of changing the inner diameter specification of the corresponding hydraulic cylinder 411 in the connecting piece 41 includes:

[0053] Set the standard pressing pressure F0 and the standard hydraulic cylinder 411 inner diameter d0;

[0054] With the preset pressing pressure of the current mold cavity 11 as F1, the ratio of the preset pressing pressure to the standard pressing pressure, F1 / F0, is obtained. Then, the diameter of the hydraulic cylinder 411 that needs to be replaced at the corresponding position of the current mold cavity 11 satisfies d1. 2 =d0 2 *F1 / F0.

[0055] The standard pressing pressure F0 and the inner diameter d0 of the standard hydraulic cylinder 411 are preset values. When the specifications of the hydraulic cylinder 411 need to be changed, the standard pressing pressure F0 and the inner diameter d0 of the standard hydraulic cylinder 411 are used as comparison standards. Specifically, when the ratio between the pressing force F1 to be adjusted and the standard pressing force F0 is F1 / F0, since the pressure inside the standard hydraulic cylinder 411 is equal to the pressure of the hydraulic cylinder 411 to be replaced, and according to the formula that force equals the product of pressure and contact cross-sectional area, F1 / F0 = S1 / S0, where S1 = π*(d1 / 2). 2 S0 = π*(d0 / 2) 2 Therefore, the diameter of the hydraulic cylinder 411 that needs to be replaced at the corresponding position of the current mold cavity 11 satisfies d1. 2 =d0 2 *F1 / F0, that is, d1=(d0) 2 *F1 / F0) 1 / 2 At this point, replacing the cylinder 411 with an inner diameter of d1 will allow the corresponding upper mold part 22 to obtain the pressing pressure of F1.

[0056] The step of adjusting the position of the connecting rod 413 relative to the crossbar 414 in the connecting member 41 includes:

[0057] The upper molds 22 symmetrically arranged on both sides of the connecting rod 413 are the first upper mold 221 and the second upper mold 222, respectively. The distance between the first upper mold 221 and the connecting rod 413 is set to L1, and the distance between the second upper mold 222 and the connecting rod 413 is set to L2.

[0058] With the preset pressing pressure of the mold cavity 11 corresponding to the first upper mold 221 as T1 and the preset pressing pressure of the mold cavity 11 corresponding to the second upper mold 222 as T2, adjust the position of the connecting rod 413 relative to the crossbar 414 so that L2=L1*T1 / T2.

[0059] After adjusting the position of the connecting rod 413, the distance L1 between the first upper mold 221 and the connecting rod 413 and the distance L2 between the second upper mold 222 and the connecting rod 413 will change simultaneously. The adjustment position of the connecting rod 413 is determined by the magnitude of the pressure to be adjusted. According to the principle that the torques generated by the first upper mold 221 and the second upper mold 222 are equal, T1*L1=T2*L2. Therefore, the adjusted position needs to satisfy L2=L1*T1 / T2. At the same time, since the total length of the crossbar 414 remains unchanged, let the total length of the crossbar 414 be L0. Therefore, L1 and L2 should also satisfy L1+L2=L0. Based on the above binary equation, the specific values ​​of L1 and L2 can be obtained, thereby obtaining the position that the connecting rod 413 needs to be adjusted to. In actual use, manual adjustment or automatic adjustment using a drive component can be used, resulting in higher precision.

[0060] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A multi-cavity powder forming equipment, characterized in that, The assembly includes a mold frame, an upper mold assembly disposed above the mold frame, and a lower mold assembly disposed below the mold frame. The upper mold assembly includes an upper mold base and an upper mold member disposed on the upper mold base. The lower mold assembly includes a lower mold base and a lower mold member disposed on the lower mold base. The mold frame is provided with a plurality of mold cavities. The position and number of the upper mold members correspond to the position and number of the mold cavities. It also includes a distribution component, which is connected between the upper mold base and the upper mold pieces. The distribution component includes a connector, which is movably connected to the upper mold base and the connector. A plurality of the upper mold pieces are movably connected to the connector. The upper mold base can transmit force to the connector, and the connector can distribute force to the plurality of the upper mold pieces. The connecting component includes a hydraulic cylinder and a plunger rod corresponding to the hydraulic cylinder. The bottom of the upper mold base is provided with multiple hydraulic cylinders, which are filled with hydraulic oil. The plunger rod is vertically arranged, and the plunger rods corresponding to the multiple hydraulic cylinders are respectively connected to the multiple upper mold components. The upper mold base can drive the upper mold components to move through the hydraulic cylinders and the plunger rods. The distribution component also includes a connecting pipe through which the plurality of hydraulic cylinders are interconnected to ensure that the pressure in the plurality of hydraulic cylinders is equal. The inner diameters of two adjacent hydraulic cylinders are set according to a preset ratio; The connecting member includes a connecting rod and a crossbar. The upper part of the connecting rod is fixedly connected to the upper mold base, and the lower part of the connecting rod is hinged to the crossbar. The crossbar is horizontally arranged, and the upper part of the upper mold component is hinged to the crossbar. Two or more upper mold components are distributed at intervals along the crossbar.

2. The multi-cavity powder forming equipment according to claim 1, characterized in that, The connecting rod is hinged to the middle of the crossbar, and the upper module is symmetrically arranged on both sides of the connecting rod.

3. The multi-cavity powder forming equipment according to claim 1, characterized in that, The position of the connecting rod is offset from the middle of the crossbar.

4. A control method, characterized in that, For controlling the multi-cavity powder forming equipment as described in any one of claims 1-3, the following steps are included: Input the preset pressing pressure for each mold cavity; When the pressing pressure of each mold cavity is equal, the inner diameter of the cylinder corresponding to each mold cavity is equal, or the upper mold parts on the crossbar are symmetrically arranged on both sides of the connecting rod, and then the upper mold base is driven to directly drive the upper mold parts to press down. When the pressing pressure of each mold cavity is not equal, change the inner diameter specification of the corresponding oil cylinder in the connector or adjust the position of the connecting rod relative to the crossbar in the connector so that the pressing pressure of each upper mold part reaches the preset requirement. The steps for changing the inner diameter of the corresponding hydraulic cylinder in the connecting component include: Set the standard pressing pressure F0 and the standard cylinder inner diameter d0; With the preset pressing pressure of the current mold cavity as F1, the ratio of the preset pressing pressure to the standard pressing pressure, F1 / F0, is obtained. Then, the diameter of the hydraulic cylinder that needs to be replaced at the corresponding position in the current mold cavity satisfies d1. 2 = d0 2 * F1 / F0; The steps for adjusting the position of the connecting rod relative to the crossbar in the connecting component include: The upper molds symmetrically arranged on both sides of the connecting rod are the first upper mold and the second upper mold, respectively. The distance between the first upper mold and the connecting rod is set to L1, and the distance between the second upper mold and the connecting rod is set to L2. With the preset pressing pressure of the mold cavity corresponding to the first upper mold part as T1 and the preset pressing pressure of the mold cavity corresponding to the second upper mold part as T2, adjust the position of the connecting rod relative to the crossbar so that L2 = L1*T1 / T2.

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