Multi-mold-cavity powder forming equipment and control method

Abstract

The invention discloses multi-die-cavity powder forming equipment and a control method.The multi-die-cavity powder forming equipment comprises a die frame, an upper die assembly arranged above the die frame and a lower die assembly arranged below the die frame, the upper die assembly comprises an upper die base and an upper die assembly arranged on the upper die base, and the lower die assembly comprises a lower die base and a lower die assembly arranged on the lower die base; the lower mold assembly comprises a lower mold base and a lower mold part arranged on the lower mold base, a plurality of mold cavities are formed in the mold frame, the distribution assembly is connected between the upper mold base and the upper mold part, the distribution assembly comprises a connecting piece, the upper mold base can transmit acting force into the connecting piece, and the upper mold base can transmit the acting force into the connecting piece. The connecting piece can distribute acting force into the multiple upper die pieces. The control method is used for controlling the multi-mold-cavity powder forming equipment. According to the invention, the total pressure can be finely distributed, so that the pressure of each die cavity can be flexibly adjusted, and the forming quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of molding equipment, and in particular to a multi-cavity powder molding equipment and a control method. Background Art

[0002] The driving structure of the 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, and then apply the pressing pressure to the mold cavity and the powder inside it through the mechanical actuator (such as the upper mold). Although the electrical control system can accurately control the total output pressure of the hydraulic or pneumatic system, in a multi-cavity system, since there are multiple mold frames in the mold frame, there are also multiple upper molds corresponding to the mold frames. The electrical control system can usually only drive the upper mold seat connected to multiple upper molds, and it is difficult to refine the specific pressure distribution of each individual upper mold, which easily leads to large deviations in the pressure values ​​of different mold cavities. Especially in the field where the powder has a relatively high requirement for the accuracy of the pressure value, or the field where the molding pressure is relatively high and close to the limit of the mold material, the pressure value with large deviation will seriously affect the molding quality of the powder, and may even damage the mold, and it is not conducive to adaptive adjustment according to different material 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 device that can finely distribute the total pressure so that the pressure of each cavity can be flexibly adjusted, thereby improving the molding quality.

[0004] In order to solve the above technical problems, the present invention provides a multi-cavity powder molding equipment, including a mold frame, an upper mold assembly arranged above the mold frame and a lower mold assembly arranged below the mold frame, the upper mold assembly includes an upper mold base and an upper mold piece arranged on the upper mold base, the lower mold assembly includes a lower mold base and a lower mold piece arranged on the lower mold base, and a plurality of mold cavities are arranged in the mold frame, and the position and number of the upper mold pieces correspond to the position and number of the mold cavities.

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

[0006] As an improvement of the above-mentioned scheme, the connecting part includes a cylinder and a plunger rod corresponding to the cylinder. A plurality of cylinders are arranged at the bottom of the upper mold base. Hydraulic oil is arranged in the cylinders. The plunger rods are vertically arranged. The plunger rods corresponding to the plurality of cylinders are respectively connected to the plurality of upper mold parts. The upper mold base can drive the upper mold part to move through the cylinders and the plunger rods.

[0007] As an improvement of the above solution, the distribution assembly further includes a connecting pipe, and the plurality of oil cylinders are interconnected through the connecting pipe so that the pressures in the plurality of oil cylinders are equal.

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

[0009] As an improvement of the above scheme, the connecting member includes a connecting rod and a cross bar, the upper part of the connecting rod is fixedly connected to the upper mold base, the lower part of the connecting rod is hinged to the cross bar, the cross bar is horizontally arranged, the upper part of the upper mold is hinged to the cross bar, and two or more upper molds are spaced apart along the cross bar.

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

[0011] As an improvement of the above solution, the position of the connecting rod is deviated from the middle of the cross bar.

[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 a preset pressing pressure of each cavity;

[0013] When the pressing pressures of the input cavities are equal, the inner diameters of the oil cylinders corresponding to the cavities are equal or the upper molds 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 to press down;

[0014] When the pressing pressures of the input mold cavities are not equal, the inner cavity diameter specifications of the corresponding oil cylinders in the connecting parts are replaced or the position of the connecting rods in the connecting parts relative to the cross bars is adjusted so that the pressing pressures of each upper mold meet the preset requirements.

[0015] As an improvement of the above solution, the step of replacing the inner cavity diameter specification of the connecting piece corresponding to the oil cylinder includes:

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

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

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

[0019] The upper molds symmetrically arranged on both sides of the connecting rod are respectively a first upper mold and a second upper mold. 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] The preset pressing pressure of the mold cavity corresponding to the first upper mold piece is input as T1, the preset pressing pressure of the mold cavity corresponding to the second upper mold piece is input as T2, and the position of the connecting rod relative to the cross rod is adjusted so that L2 = L1*T1 / T2.

[0021] The implementation of the present invention has the following beneficial effects:

[0022] The multi-cavity powder molding equipment of the present invention is provided with a mold frame, an upper mold assembly, a lower mold assembly and a distribution assembly, wherein the mold frame is provided with a plurality of mold cavities, the position and number of the upper mold members of the upper mold assembly correspond to the position and number of the mold cavities, and is used for multi-cavity molding operations, and the distribution assembly includes a connecting piece, the upper mold base is movably connected to the connecting piece, a plurality of the upper mold members are movably connected to the connecting piece, the upper mold base can transmit the force to the connecting piece, and the connecting piece can distribute the force to the plurality of upper mold members, thereby realizing fine distribution of pressure, so that the pressure of each mold cavity can be flexibly adjusted, thereby improving the molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 is a schematic structural diagram of a first embodiment of a distribution assembly of the present invention;

[0025] Figure 3 is a schematic structural diagram of a second embodiment of a distribution assembly of the present invention;

[0026] Figure 4 It is a flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0028] See also Figure 1 and Figure 2 The embodiment of the present invention discloses a multi-cavity powder molding device, comprising a mold frame 1, an upper mold assembly 2 arranged above the mold frame 1, and a lower mold assembly 3 arranged below the mold frame 1. The upper mold assembly 2 comprises an upper mold base 21 and an upper mold member 22 arranged 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 material for pressing the powder material. Conventional powder molding devices usually connect the upper mold base 21 with a driving device. The driving device can only control the overall force of the upper mold base 21, but cannot control the force of each upper mold member 22. The lower mold assembly 3 comprises a lower mold base 31 and a lower mold member 32 arranged on the lower mold base 31. A plurality of mold cavities 11 are arranged in the mold frame 1. The position and number of the upper mold member 22 correspond to the position and number of the mold cavities 11, and can be used to perform powder molding on the plurality of mold cavities 11.

[0029] In an embodiment of the present invention, in order to be able to finely distribute pressure to each upper mold part 22, the multi-cavity powder molding equipment also includes a distribution component 4, which 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, wherein the distribution component 4 includes a connecting member 41, the upper mold base 21 is movably connected to the connecting member 41, and a plurality of the upper mold parts 22 are movably connected to the connecting member 41, and the upper mold base 21 can transmit the force to the connecting member 41, and the connecting member 41 can distribute the force to the plurality of upper mold parts 22, and the connecting member 41 can distribute the force to each of the upper mold parts 22, thereby achieving fine distribution, and through 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 the embodiment of the present invention is provided with a mold frame 1, an upper mold assembly 2, a lower mold assembly 3 and a distribution assembly 4, wherein the mold frame 1 is provided with a plurality of mold cavities 11, the position and number of the upper mold members 22 of the upper mold assembly 2 correspond to the position and number of the mold cavities 11, and is used for the molding operation of the multiple mold cavities 11, and the distribution assembly 4 includes a connecting member 41, the upper mold base 21 is movably connected to the connecting member 41, and a plurality of the upper mold members 22 are movably connected to the connecting member 41, the upper mold base 21 can transmit the force to the connecting member 41, and the connecting member 41 can distribute the force to the plurality of upper mold members 22, thereby realizing the fine distribution of pressure, so that the pressure of each mold cavity 11 can be flexibly adjusted, thereby improving the molding quality.

[0032] See also Figure 2 In the first embodiment, the pressure distribution of the upper mold 22 is carried out by the method of controlling the oil cylinder 411. Specifically, the connecting member 41 includes an oil cylinder 411 and a plunger rod 412 corresponding to the oil cylinder 411. The oil cylinder 411 is provided with hydraulic oil, and the hydraulic oil controls the force of the plunger rod 412, thereby controlling the force of the upper mold 22. A plurality of oil cylinders 411 are provided at the bottom of the upper mold base 21, and the plunger rod 412 is vertically arranged. The plunger rods 412 corresponding to the plurality of oil cylinders 411 are respectively connected to the plurality of upper molds 22, and each upper mold 22 corresponds to a different oil cylinder 411. The upper mold base 21 can drive the upper mold 22 to move through the oil cylinder 411 and the plunger rod 412, so each oil cylinder 411 can control the pressing pressure of each upper mold 22, thereby realizing accurate distribution of the force.

[0033] Furthermore, in the first embodiment, the distribution component 4 also includes a connecting pipe 42, and the multiple cylinders 411 are interconnected through the connecting pipe 42. Using the communicating vessel principle, different cylinders 411 are connected through the connecting pipe 42, so that the pressures in the multiple cylinders 411 are equal.

[0034] Traditional powder molding equipment uses a single upper mold base 21 to distribute pressure to multiple upper mold parts 22, wherein the upper mold base 21 and the upper mold parts 22 are rigidly connected, and the force transmission method of the upper mold base 21 is "rigid" transmission. The disadvantages of this rigid transmission are relatively obvious. When there are assembly errors, material differences, wear differences of the upper mold parts 22, temperature differences and other factors, the force transmitted by the upper mold base 21 cannot be evenly transmitted to each of the upper mold parts 22. Therefore, when differentiated transmission is required, it is impossible to accurately adjust the force difference in each of the upper mold parts 22, so that the quality of the pressed product does not match the expected quality. In the first embodiment, the hydraulic oil in the cylinder 411 is used to balance the pressure in each upper mold part 22, which can achieve the effect of "flexible" transmission. This flexible transmission can ensure that the force difference between each upper mold part 22 can be quickly "flexibly" adjusted, and it is spontaneously adjusted, fast and accurate. When differentiated transmission is required, the force of different upper mold parts 22 can be different by adjusting the specification parameters 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 oil cylinders 411 are equal. Since the pressure in each oil cylinder 411 is equal, when the inner diameters of the oil cylinders 411 are equal, the force driving the plunger rod 412 is equal, so that the pressing pressure of each upper mold 22 is equal, achieving the effect of uniform distribution of the pressing pressure.

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

[0037] See also Figure 3The second embodiment adopts a connecting rod control method to distribute the pressure of the upper mold 22. Specifically, the connecting member 41 includes a connecting rod 413 and a cross bar 414. The upper part of the connecting rod 413 is fixedly connected to the upper mold base 21. The force of the upper mold base 21 can be directly transmitted to the connecting rod 413, and the lower part of the connecting rod 413 is hinged to the cross bar 414. The cross bar 414 is horizontally arranged, and the upper part of the upper mold 22 is hinged to the cross bar 414. Two or more upper molds 22 are spaced apart along the cross bar 414.

[0038] When in use, the upper mold base 21 transmits the force to the connecting rod 413, and the connecting rod 413 disperses the force to each upper mold 22 through the cross bar 414. Since the cross bar 414 is connected to the connecting rod 413 in a hinged manner, the force transmission between the connecting rod 413 and the cross bar 414 also adopts a "flexible" transmission method. In the flexible transmission, if the force of one of the upper molds 22 located on one side of the connecting rod 413 is large, its reaction force is also large, which will drive the upper mold 22 located on the other side of the connecting rod 413 to move in the direction of further pressing the powder, thereby increasing the force of the upper mold 22, so that the forces of the upper molds 22 on both sides of the connecting rod 413 are balanced, thereby forming a fine distribution of pressure. The cross bar 414 can be multiple, all of which are hinged to the connecting rod 413.

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

[0040] When it is necessary to perform differential adjustment on the pressing pressure of different upper mold pieces 22, the position of the connecting rod 413 deviates from the middle of the cross bar 414. At this time, the distances between the upper mold pieces 22 on both sides of the connecting rod 413 and the connecting rod 413 are not equal. In order to achieve force balance, the torques generated by the two upper mold pieces 22 on the cross bar 414 are opposite in direction but equal in magnitude. Therefore, the forces generated by each upper mold piece 22 are not equal, resulting in differentiated adjustment. The accuracy of the adjustment depends on the accuracy of the position adjustment of the connecting rod 413.

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

[0042] S01, inputting a preset pressing pressure of each mold cavity 11;

[0043] S02, when the pressing pressures input to the mold cavities 11 are equal, the inner diameters of the oil cylinders 411 corresponding to the mold cavities 11 are equal or the upper mold pieces 22 on the cross bar 414 are 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 piece 22 to press downward;

[0044] S02`, when the pressing pressures of the input mold cavities 11 are not equal, replace the inner cavity diameter specification of the corresponding oil cylinder 411 in the connecting member 41 or adjust the position of the connecting rod 413 in the connecting member 41 relative to the cross bar 414 so that the pressing pressure of each upper mold 22 reaches the preset requirement.

[0045] Initially, the preset pressing pressure of each mold cavity 11 is input according to the powder material and process conditions to be pressed in each mold cavity 11 , so as to finely adjust the pressure of each mold cavity 11 .

[0046] In the first embodiment, the initial state of the multi-cavity powder molding equipment of the present invention is that the inner cavity diameters of the cylinders 411 corresponding to each cavity 11 are equal. Since each cylinder 411 is connected using a connecting pipe 42, the pressure in each cylinder 411 is equal. When the inner cavity diameters of each cylinder 411 are 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 part 22 will be equal.

[0047] When the pressing pressures input into each mold cavity 11 are equal, there is no need to change the specifications of the oil cylinder 411. By driving the upper mold base 21 in the initial state to directly drive the upper mold member 22 to be pressed down, multiple upper mold members 22 can obtain equal pressing pressures.

[0048] When the pressing pressures of the input mold cavities 11 are not equal, it is necessary to adjust the pressing pressures of different upper mold parts 22 differently. At this time, the inner diameter specifications of the cylinder 411 corresponding to the upper mold parts 22 that need to apply different pressing pressures in the connecting part 41 are replaced. Since the pressure in each cylinder 411 is equal, when the inner diameter specifications of the cylinder 411 are different, the driving force of the hydraulic oil in the cylinder 411 on the upper mold part 22 can be 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 pieces 22 on the cross bar 414 are symmetrically arranged on both sides of the connecting rod 413, and the upper mold pieces 22 symmetrically arranged on both sides of the connecting rod 413 are respectively the first upper mold piece 221 and the second upper mold piece 222, and the distance from the first upper mold piece 221 to the connecting rod 413 is equal to the distance from the second upper mold piece 222 to the connecting rod 413, and at this time, the pressing pressures of the first upper mold piece 221 and the second upper mold piece 222 are equal. The number of the cross bars 414 can be multiple, and the multiple cross bars 414 are hinged to the connecting rod 413 at the same time, wherein the multiple cross bars 414 can be located on the same horizontal plane or on different horizontal planes, and the upper mold pieces 22 are arranged at both ends of each cross bar 414, and the two upper mold pieces 22 are respectively arranged on both sides of the connecting rod 413.

[0050] When the pressing pressures input into each mold cavity 11 are equal, there is no need to adjust the distance between the upper mold member 22 and the connecting rod 413, that is, the connecting rod 413 remains in the initial position, and the upper mold base 21 is driven in the initial state to directly drive the upper mold member 22 to be pressed downward, so that the multiple upper mold members 22 can obtain equal pressing pressures.

[0051] When the pressing pressures input to each mold cavity 11 are not equal, the position of the connecting rod 413 in the connecting member 41 is adjusted relative to the cross bar 414, 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 to 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 replacing the inner diameter specification of the connecting member 41 corresponding to the inner diameter specification of the oil cylinder 411 includes:

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

[0054] The preset pressing pressure of the current mold cavity 11 is input as F1, and the ratio of the preset pressing pressure of the current mold cavity 11 to the standard pressing pressure is obtained as F1 / F0. Then, the diameter of the oil 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 oil cylinder 411 are preset values. When the specifications of the oil cylinder 411 need to be replaced, the standard pressing pressure F0 and the inner diameter d0 of the standard oil cylinder 411 are used as comparison standards. When the ratio between the pressing force F1 to be adjusted and the standard pressing force F0 is F1 / F0, since the pressure in the standard oil cylinder 411 is equal to the pressure in the oil cylinder 411 to be replaced, according to the formula that the applied force is equal to the product of the pressure and the contact cross-sectional area, F1 / F0=S1 / S0, where S1=π*(d1 / 2) 2 , S0=π*(d0 / 2) 2 Therefore, the diameter of the oil 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 time, by replacing the oil cylinder 411 with an inner diameter specification of d1, the corresponding upper mold 22 can obtain a pressing pressure of F1.

[0056] The step of adjusting the position of the connecting rod 413 in the connecting member 41 relative to the cross bar 414 comprises:

[0057] The upper molds 22 symmetrically arranged on both sides of the connecting rod 413 are respectively a first upper mold 221 and a second upper mold 222. 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] The preset pressing pressure of the mold cavity 11 corresponding to the first upper mold 221 is input as T1, the preset pressing pressure of the mold cavity 11 corresponding to the second upper mold 222 is input as T2, and the position of the connecting rod 413 relative to the cross bar 414 is adjusted 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 at the same time. The adjustment position of the connecting rod 413 is determined according to the pressure that needs to be adjusted. According to the principle that the torque generated by the first upper mold 221 and the second upper mold 222 is equal, T1*L1=T2*L2, so the adjusted position needs to satisfy L2=L1*T1 / T2. At the same time, since the total length of the cross bar 414 remains unchanged, assuming that the total length of the cross bar 414 is L0, L1 and L2 should also satisfy L1+L2=L0. According to the above binary equation, the specific values ​​of L1 and L2 can be obtained, thereby obtaining the position of the connecting rod 413 that needs to be adjusted. In actual use, manual adjustment can be used, and automatic adjustment can also be used by a driving component, which is more accurate.

[0060] The above are preferred embodiments of the present invention. It should be noted that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A multi-cavity powder molding equipment, characterized in that: The mold frame comprises a mold frame, an upper mold assembly arranged above the mold frame, and a lower mold assembly arranged below the mold frame, wherein the upper mold assembly comprises an upper mold base and an upper mold piece arranged on the upper mold base, and the lower mold assembly comprises a lower mold base and a lower mold piece arranged on the lower mold base, and a plurality of mold cavities are arranged in the mold frame, and the position and number of the upper mold pieces 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 part. The distribution component includes a connecting part. The upper mold base is movably connected to the connecting part. A plurality of upper mold parts are movably connected to the connecting part. The upper mold base can transmit the force to the connecting part, and the connecting part can distribute the force to the plurality of upper mold parts.

2. The multi-cavity powder forming equipment according to claim 1, characterized in that: The connecting part includes a cylinder and a plunger rod corresponding to the cylinder. A plurality of cylinders are arranged at the bottom of the upper mold base. Hydraulic oil is arranged in the cylinders. The plunger rods are vertically arranged. The plunger rods corresponding to the plurality of cylinders are respectively connected to the plurality of upper mold parts. The upper mold base can drive the upper mold part to move through the cylinders and the plunger rods.

3. The multi-cavity powder forming equipment according to claim 2, characterized in that: The distribution assembly further includes a connecting pipe, through which the plurality of oil cylinders are connected to each other so that the pressures in the plurality of oil cylinders are equal.

4. The multi-cavity powder forming equipment according to claim 3, characterized in that: The inner diameters of the plurality of oil cylinders are equal, or the inner diameters of two adjacent oil cylinders are set according to a preset ratio.

5. The multi-cavity powder forming equipment according to claim 1, characterized in that: The connecting member includes a connecting rod and a cross bar, the upper part of the connecting rod is fixedly connected to the upper mold base, the lower part of the connecting rod is hinged to the cross bar, the cross bar is horizontally arranged, the upper part of the upper mold is hinged to the cross bar, and two or more upper molds are spaced apart along the cross bar.

6. The multi-cavity powder forming equipment according to claim 5, characterized in that: The connecting rod is hinged to the middle part of the cross rod, and the upper mold parts are symmetrically arranged on both sides of the connecting rod.

7. The multi-cavity powder forming equipment according to claim 5, characterized in that: The position of the connecting rod is offset from the middle of the cross rod.

8. A control method, characterized in that: Used to control the multi-cavity powder forming equipment according to any one of claims 1 to 7, comprising the following steps: Enter the preset pressing pressure for each cavity; When the pressing pressures of the input cavities are equal, the inner diameters of the oil cylinders corresponding to the cavities are equal or the upper molds 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 to press down; When the pressing pressures of the input mold cavities are not equal, the inner cavity diameter specifications of the corresponding oil cylinders in the connecting parts are replaced or the position of the connecting rods in the connecting parts relative to the cross bars is adjusted so that the pressing pressures of each upper mold meet the preset requirements.

9. The control method according to claim 8, characterized in that: The step of replacing the inner cavity diameter specification of the connecting piece corresponding to the oil cylinder comprises: Set the standard pressing pressure F0 and the standard cylinder inner diameter d0; Input the preset pressing pressure of the current mold cavity as F1, and obtain the ratio of the preset pressing pressure of the current mold cavity to the standard pressing pressure F1 / F0. Then the diameter of the oil cylinder that needs to be replaced at the corresponding position of the current mold cavity satisfies d1. 2 =d0 2 *F1 / F0.

10. The control method according to claim 8, characterized in that: The step of adjusting the position of the connecting rod in the connecting member relative to the cross rod comprises: The upper molds symmetrically arranged on both sides of the connecting rod are respectively a first upper mold and a second upper mold. 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. The preset pressing pressure of the mold cavity corresponding to the first upper mold piece is input as T1, the preset pressing pressure of the mold cavity corresponding to the second upper mold piece is input as T2, and the position of the connecting rod relative to the cross rod is adjusted so that L2 = L1*T1 / T2.

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