Powder forming machine and assembly method and testing method thereof

Abstract

The present invention provides a powder forming machine and its assembly method and testing method, which relate to the field of powder metallurgy. The powder forming machine includes an upper bed, a column, a lower bed and a locking assembly, each locking assembly includes a long pull rod, the top end of the long pull rod is connected to a first locking nut, the bottom end is connected to a second locking nut, and a first hydraulic cylinder capable of changing the distance between the second locking nut and the corresponding lower bed is also provided between the second locking nut and the lower bed, and an oil filling port is provided on the first hydraulic cylinder, and the oil filling ports corresponding to more than four locking assemblies are connected in series through pipelines. The locking method in the present application can prevent the nuts of the powder forming machine from loosening during long-term use after debugging, which is beneficial to improving the reliability of the locking method; at the same time, the oil filling ports are connected in series so that the locking force of each long pull rod after debugging is consistent, which is beneficial to reducing the difference in deformation generated during the pressing process in the later stage, and further beneficial to improving the accuracy of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy, and in particular to a powder forming machine and an assembling method and a testing method thereof. Background Art

[0002] In order to facilitate processing and improve the processing accuracy of the bed, existing large-scale powder forming machines or high-precision powder forming machines often split the bed into three parts: the upper bed, the column and the lower bed, and then combine the three parts during the assembly process. The process of combining the three parts of the bed is very critical and will affect the applicable accuracy and life of the whole machine. The main existing connection method is to connect and tighten with relatively large screws. With this connection method, the screws are easy to loosen or break due to vibration and impact during the operation of the equipment, affecting the continuity of production.

[0003] In view of this, a powder forming machine that can reliably connect the upper bed, the column and the lower bed is particularly necessary. Summary of the invention

[0004] The purpose of the present invention includes providing a powder forming machine and an assembly method and a testing method thereof, which can keep the connection between the upper bed, the column and the lower bed relatively stable while ensuring that the equipment has high precision.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a powder forming machine, comprising an upper bed, a column, a lower bed and a locking assembly, wherein the upper bed is fixed to the upper end of the column, the lower bed is fixed to the lower end of the column, and there are more than four locking assemblies, which are arranged around the powder forming machine;

[0007] Each of the locking assemblies comprises a long pull rod which is coaxial with the column and passes through the column, the top end of the long pull rod passes through the upper bed and is connected to a first locking nut, the bottom end of the long pull rod passes through the lower bed and is connected to a second locking nut, a first hydraulic cylinder which is capable of changing the distance between the second locking nut and the corresponding lower bed is also provided between the second locking nut and the lower bed, an oil filling port is provided on the first hydraulic cylinder, and the oil filling ports corresponding to more than four of the locking assemblies are connected in series through pipelines.

[0008] In an optional embodiment, the first hydraulic cylinder includes an oil cylinder and a piston rod, the top surface of the oil cylinder abuts against the lower bed, the piston rod abuts against the upper surface of the second locking nut, and a limiting ring is provided between the oil cylinder and the second locking nut.

[0009] In an optional embodiment, a first positioning ring is provided at the connection between the column and the upper bed, the first positioning ring is sleeved on the long pull rod, a first upper step adapted to the upper end of the first positioning ring is provided on the top of the column, and a first lower step adapted to the lower end of the first positioning ring is provided on the upper bed;

[0010] A first upper connecting piece is arranged on the top of the column, a first lower connecting piece is arranged at the connection between the upper bed and the column, and the first upper connecting piece and the first lower connecting piece are fixed by a locking screw.

[0011] In an optional embodiment, a second positioning ring is provided at the connection between the column and the lower bed, the second positioning ring is sleeved on the long pull rod, a second upper step adapted to the upper end of the second positioning ring is provided at the bottom of the column, and a second lower step adapted to the lower end of the second positioning ring is provided on the lower bed;

[0012] A second upper connecting piece is arranged at the bottom of the column, and a second lower connecting piece is arranged at the connection between the lower bed and the column. The second upper connecting piece and the second lower connecting piece are fixed by locking screws.

[0013] In an optional embodiment, two or more level adjustment pads are provided under the lower bed.

[0014] In an optional embodiment, a detection component is further included, and the detection component includes a pressure test component and a reading component;

[0015] The reading assembly includes: a detection table fixed to the upper bed and a detection rod fixed to the lower bed, the top surface of the detection rod abuts against the head of the detection table and compresses the table rod on which the head is installed; the reading assembly corresponds to the locking assembly one by one, and the detection rod is arranged on one side of the corresponding locking assembly;

[0016] The pressure test assembly comprises: a pressure test base fixed to the lower bed and a pressure test block fixed to the upper bed, and a second hydraulic cylinder capable of adjusting the pressure between the pressure test base and the pressure test block is arranged between the pressure test base and the pressure test block.

[0017] In an optional embodiment, a through hole is provided on the upper bed body, a composite bearing is provided in the through hole, an outer ring of the composite bearing is fixed to the inner wall of the through hole, the top end of the detection rod extends into the inner ring of the composite bearing, and the inner diameter of the composite bearing is adapted to the outer diameter of the top of the detection rod.

[0018] In a second aspect, the present invention provides an assembly method of the powder forming machine described in the aforementioned embodiment, comprising:

[0019] Step 1, assembling the upper bed, the column, the lower bed and the locking assembly to obtain the powder forming machine to be debugged;

[0020] Step two, injecting liquid of a first preset pressure into the oil filling port through a pipeline, so that a gap is generated between the oil cylinder in each locking assembly and the second locking nut, and inserting the limit ring into the gap. The thickness of the limit ring is equal to the height of the gap corresponding to it, so as to obtain the powder forming machine.

[0021] In an optional embodiment, the tension borne by each long pull rod in the powder forming machine is 45-55% of the maximum force of the equipment;

[0022] And / or, the long pull rod is in a linear elastic deformation state.

[0023] In a third aspect, the present invention provides a method for testing a powder forming machine according to any one of the aforementioned embodiments, comprising: injecting liquids of different pressures into a second hydraulic cylinder of the powder forming machine after assembling the detection assembly, and reading the reading of the detection meter; if the linear correlation coefficient between the reading of the detection meter corresponding to each locking assembly and the pressure of the liquid injected into the second hydraulic cylinder is greater than a first preset value, the product is qualified;

[0024] And / or, after injecting liquid into the second hydraulic cylinder of the powder forming machine after assembling the detection component, read the readings of the detection table corresponding to each locking component. If the maximum deviation of the readings of each monitoring table is less than the second preset value, it is a qualified product.

[0025] The beneficial effects of the powder forming machine, the assembly method of the powder forming machine, the method and the testing method of the powder forming machine provided by the present invention include:

[0026] The locking method in the present application can prevent the nut from loosening during long-term use of the powder forming machine after debugging, and can also prevent the nut from loosening due to misoperation by mechanics, which is beneficial to improving the reliability of the locking method; at the same time, the oil filling port is connected in series so that the locking force of each long pull rod is consistent after debugging, which is beneficial to reducing the difference in deformation caused by the pressing process in the later stage, and then it is beneficial to improve the accuracy of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of the powder forming machine provided in this application;

[0029] Figure 2 A schematic diagram of the installation of the second hydraulic cylinder provided in this application;

[0030] Figure 3 for Figure 1 Enlarged view of part A in the middle;

[0031] Figure 4 The deformation and force relationship diagram of the long pull rod provided in this application.

[0032] Icons: 1-first locking nut; 2-upper bed; 3-long tie rod; 4-first positioning ring; 5-column; 7-second positioning ring; 8-lower bed; 9-cylinder seal; 10-cylinder; 11-piston; 12-piston seal; 13-limiting ring; 14-second locking nut; 15-horizontal adjustment pad; 21-process stopper; 22-pressure test base; 23-pressure test column; 24-pressure test stopper; 25-second hydraulic cylinder; 31-detection rod A; 32-detection rod B; 33-meter seat; 34-detection meter; 35-composite bearing. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0038] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0039] In the related art, the bed of the powder forming machine is divided into three parts: an upper bed 2, a column 5 and a lower bed 8, which are then combined during the assembly process. The three are combined by connecting and fastening with relatively large screws. With this connection method, the screws are easily loosened or broken due to vibration and impact during the operation of the equipment, affecting the continuity of production.

[0040] To this end, the present invention provides a powder forming machine, such as Figure 1-3 As shown, it includes an upper bed 2, a column 5, a lower bed 8 and a locking assembly, wherein the upper bed 2 is fixed to the upper end of the column 5, the lower bed 8 is fixed to the lower end of the column 5, and there are more than four locking assemblies, which are arranged around the powder molding machine;

[0041] Each of the locking assemblies comprises a long pull rod 3 which is coaxial with the column 5 and passes through the column 5, the top end of the long pull rod 3 passes through the upper bed 2 and is connected to a first locking nut 1, the bottom end of the long pull rod 3 passes through the lower bed 8 and is connected to a second locking nut 14, a first hydraulic cylinder which is capable of changing the distance between the second locking nut 14 and the corresponding lower bed 8 is also provided between the second locking nut 14 and the lower bed 8, an oil filling port is provided on the first hydraulic cylinder, and the oil filling ports corresponding to more than four of the locking assemblies are connected in series through pipelines.

[0042] In the present application, the upper bed 2, the vertical rod and the lower bed 8 are connected by a long pull rod 3, and a first hydraulic cylinder is arranged on the long pull rod 3. The oil filling ports of the first hydraulic cylinders corresponding to the multiple locking devices are connected in series with each other, which can be helpful for adjusting the locking force of the locking device before the powder molding machine is used, and adjusting the locking force of each locking device to the same level, thereby ensuring that the deformation of the long pull rods 3 corresponding to different locking devices is relatively small during the later re-pressing process.

[0043] The locking method in the implementation mode of the present application can prevent the nut from loosening during the long-term use of the powder forming machine after debugging, and can also prevent the nut from loosening due to misoperation by mechanics, which is beneficial to improving the reliability of the locking method; at the same time, the oil filling port is connected in series so that the locking force exerted on each long pull rod 3 after debugging is consistent, which is beneficial to reducing the difference in deformation generated during the pressing process in the later stage, and further beneficial to improving the accuracy of the equipment.

[0044] It should be noted that the locking devices in the present application are usually provided at each of the four corners of the powder forming machine, with a total of four. In some special cases, more locking devices may be provided, such as 5, 6, etc.

[0045] In an optional embodiment, the first hydraulic cylinder includes an oil cylinder 10 and a piston rod 11, the top surface of the oil cylinder 10 abuts against the lower bed 8, the piston rod 11 abuts against the upper surface of the second locking nut 14, and a limiting ring 13 is arranged between the oil cylinder 10 and the second locking nut 14.

[0046] Specifically, the cylinder 10 and the piston 11 are respectively against the lower bed 8 and the second locking nut 14. By adjusting the thickness of the limit ring 13, the locking force of each locking device can be adjusted to the same level, which is beneficial to the consistent deformation of each long pull rod 3 during the later pressing process, and further beneficial to improving the equipment accuracy; a piston seal 12 can be arranged between the cylinder 10 and the piston 11, and a cylinder seal ring 9 is installed on the cylinder 10.

[0047] In an optional embodiment, a first positioning ring 4 is provided at the connection between the column 5 and the upper bed 2, the first positioning ring 4 is sleeved on the long pull rod 3, a first upper step adapted to the upper end of the first positioning ring 4 is provided on the top of the column 5, and a first lower step adapted to the lower end of the first positioning ring 4 is provided on the upper bed 2;

[0048] A first upper connecting member is disposed on the top of the column 5 , and a first lower connecting member is disposed at the connection between the upper bed 2 and the column 5 . The first upper connecting member and the first lower connecting member are fixed by locking screws.

[0049] Specifically, in the embodiment of the present application, the column 5 and the upper bed 2 are radially limited by the first positioning ring 4 and axially limited by the locking screw, so that the column 5 and the upper bed 2 can be stably connected.

[0050] In an optional embodiment, a second positioning ring 7 is provided at the connection between the column 5 and the lower bed 8, the second positioning ring 7 is sleeved on the long pull rod 3, a second upper step adapted to the upper end of the second positioning ring 7 is provided at the bottom of the column 5, and a second lower step adapted to the lower end of the second positioning ring 7 is provided on the lower bed 8;

[0051] A second upper connecting piece is disposed at the bottom of the column 5 , and a second lower connecting piece is disposed at the connection between the lower bed 8 and the column 5 . The second upper connecting piece and the second lower connecting piece are fixed by locking screws.

[0052] Specifically, in the embodiment of the present application, the column 5 and the lower bed 8 are radially limited by the second positioning ring 7 and axially limited by the locking screw, so that the column 5 and the lower bed 8 can be stably connected.

[0053] In an optional embodiment, two or more level adjustment pads 15 are provided under the lower bed 8 to facilitate adjustment of the powder forming machine to a horizontal state.

[0054] In an optional embodiment, a detection component is further included, and the detection component includes a pressure test component and a reading component;

[0055] The reading assembly includes: a detection gauge 34 fixed to the upper bed 2 and a detection rod fixed to the lower bed 8, the top surface of the detection rod abuts against the gauge head of the detection gauge 34, and compresses the gauge rod on which the gauge head is installed; the reading assembly corresponds to the locking assembly one by one, and the detection rod is arranged on one side of the corresponding locking assembly;

[0056] The pressure test assembly includes: a pressure test base 22 fixed to the lower bed 8 and a pressure test block 24 fixed to the upper bed 2, and a second hydraulic cylinder 25 capable of adjusting the pressure between the pressure test base 22 and the pressure test block 24 is arranged between the pressure test base 22 and the pressure test block 24.

[0057] The detection assembly can be used to test whether there is a linear relationship between the deformation of the long tie rod 3 and the pressure applied between the upper bed 2 and the lower bed 8, and to determine the deviation of the deformation of different long tie rods 3 under the same pressure, so as to facilitate the screening of qualified products with higher equipment precision, or to further improve the accuracy of the equipment according to the test results. Specifically, the greater the liquid pressure applied in the second hydraulic cylinder 25, the greater the deformability of the long tie rod 3, and the greater the reading of the detection gauge 34.

[0058] It should be noted that a gauge base 33 may be provided on the upper bed 2 in the present application, and the detection gauge 34 is installed on the gauge base 33, so that the detection gauge 34 can measure the deformation of the elongated stem; in some embodiments, a pressure test column 23 may also be provided between the second hydraulic cylinder 25 and the lower bed 8, and the pressure test component can be adapted to various models of powder forming machines by adjusting the height of the pressure test column 23.

[0059] In an optional embodiment, a through hole is provided on the upper bed 2, a composite bearing 35 is provided in the through hole, an outer ring of the composite bearing 35 is fixed to the inner wall of the through hole, the top end of the detection rod extends into the inner ring of the composite bearing 35, and the inner diameter of the composite bearing 35 is adapted to the outer diameter of the top of the detection rod.

[0060] Since the detection rod is relatively long, it is easy to shake when subjected to external forces such as vibration, thereby affecting the accuracy of the readings of the detection gauge 34. Therefore, a composite bearing 35 is provided in the present application. On the one hand, it guides the top end of the detection rod so that the detection gauge 34 can eliminate interference caused by factors such as vibration; on the other hand, the inner ring of the composite bearing 35 and the detection rod have good lubricity, which can prevent the detection rod from being stuck, thereby further improving the accuracy of the readings of the detection gauge 34.

[0061] It should be noted that since the deformation of the long pull rod 3 is relatively small, the detection gauge 34 in the implementation mode of the present application can select a μ gauge, that is, one grid represents a deformation of the long pull rod 3 of 1μ. Under such precision, the shaking or jamming of the long pull rod 3 has a very large impact on the reading of the detection gauge 34, so the provision of the composite bearing 35 is very necessary.

[0062] It should also be noted that the detection rod in the present application can be one or two detection rods such as detection rod A31 and detection rod B32. The detection rod should be set on one side of the corresponding long pull rod 3. In order to be able to more accurately measure the deformation of the long pull rod 3, the distance between the detection rod and its corresponding long pull rod 3 should not be too far, so that the reading of the detection table 34 can more accurately represent the deformation of the long pull rod 3. In some cases, the distance between the detection rod and the long pull rod 3 can be 10 cm, 5 cm or even larger or smaller, which is related to the size of the micro-powder forming machine.

[0063] The present invention also provides a method for assembling the powder forming machine described in the above embodiment, comprising:

[0064] Step 1, assembling the upper bed 2, the column 5, the lower bed 8 and the locking assembly to obtain the powder forming machine to be debugged;

[0065] Step two, injecting liquid of a first preset pressure into the oil filling port through a pipeline, so that a gap is generated between the oil cylinder 10 and the second locking nut 14 in each locking assembly, and inserting the limit ring 13 into the gap. The thickness of the limit ring 13 is equal to the height of the gap corresponding to it, so as to obtain the powder forming machine.

[0066] In the implementation mode of the present application, the powder forming machine is first assembled and then debugged to improve the accuracy of the equipment. The specific debugging method is to inject a liquid of a first preset pressure into the oil filling port through a pipeline. Under the action of the first hydraulic cylinder and the liquid, each long pull rod 3 will be subjected to the same pulling force. At this time, the gap between the oil cylinder 10 and the second locking nut 14 will be different. Therefore, limit rings 13 of different thicknesses are used to fill the gap, so that the initial tension of each long pull rod 3 is the same, which is beneficial to reduce the difference in deformation of each long pull rod 3 when subjected to tension subsequently.

[0067] It should be noted that when assembling the long pull rod 3 in the present application, a process stopper 21 can be introduced first to prevent the process stopper 21 from being on the lower bed 8 to support the long pull rod 3 so that the top end of the long pull rod 3 passes through the upper bed 2, and the first locking nut 1 is fixed to the top end of the long pull rod 3. Then, the process stopper 21 is removed, and the first hydraulic cylinder and the second locking nut 14 are installed.

[0068] In an optional embodiment, the tension borne by each long pull rod in the powder forming machine is 45-55% of the maximum force of the equipment;

[0069] And / or, the long pull rod 3 is in a linear elastic deformation state.

[0070] When the long pull rod 3 is in a linear elastic deformation state, such as Figure 4 As shown, during the pressing process of the equipment, the difference in the deformation of the four long tie rods 3 is small, which is more conducive to ensuring the accuracy of the pressed product.

[0071] By pre-stretching the long pull rod 3 in step 2 and setting a limiting ring 13 that matches the gap, the problem of excessive difference in elastic deformation of each long pull rod 3 in the initial stage can be avoided. At the same time, the powder forming machine is far away from the yield point of the long pull rod 3 when it is under the maximum pressing force, and is always in the optimal elastic deformation range.

[0072] The embodiment of the present invention further provides a method for testing the powder forming machine described in any one of the aforementioned embodiments, comprising: after injecting liquids of different pressures into the second hydraulic cylinder 25 of the powder forming machine after the detection component is assembled, reading the reading of the detection gauge 34; if the linear correlation coefficient between the reading of the detection gauge 34 corresponding to each locking component and the pressure of the liquid injected into the second hydraulic cylinder 25 is greater than a first preset value, it is a qualified product;

[0073] And / or, after injecting liquid into the second hydraulic cylinder 25 of the powder forming machine after assembling the detection component, read the readings of the detection meter 34 corresponding to each locking component. If the maximum deviation of the readings of each monitoring meter is less than the second preset value, it is a qualified product.

[0074] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A powder forming machine, characterized in that: It includes an upper bed, a column, a lower bed and a locking assembly, wherein the upper bed is fixed to the upper end of the column, the lower bed is fixed to the lower end of the column, and there are more than four locking assemblies which are arranged around the powder forming machine; Each of the locking assemblies comprises a long pull rod which is coaxial with the column and passes through the column, the top end of the long pull rod passes through the upper bed and is connected to a first locking nut, the bottom end of the long pull rod passes through the lower bed and is connected to a second locking nut, a first hydraulic cylinder which is capable of changing the distance between the second locking nut and the corresponding lower bed is also arranged between the second locking nut and the lower bed, an oil filling port is arranged on the first hydraulic cylinder, and the oil filling ports corresponding to more than four of the locking assemblies are connected in series through pipelines.

2. The powder forming machine according to claim 1, characterized in that: The first hydraulic cylinder includes an oil cylinder and a piston rod, the top surface of the oil cylinder abuts against the lower bed, the piston rod abuts against the upper surface of the second locking nut, and a limiting ring is arranged between the oil cylinder and the second locking nut.

3. The powder forming machine according to claim 1, characterized in that: A first positioning ring is provided at the connection between the column and the upper bed, the first positioning ring is sleeved on the long pull rod, a first upper step adapted to the upper end of the first positioning ring is provided on the top of the column, and a first lower step adapted to the lower end of the first positioning ring is provided on the upper bed; A first upper connecting piece is arranged on the top of the column, a first lower connecting piece is arranged at the connection between the upper bed and the column, and the first upper connecting piece and the first lower connecting piece are fixed by a locking screw.

4. The powder forming machine according to claim 1, characterized in that: A second positioning ring is provided at the connection between the column and the lower bed, the second positioning ring is sleeved on the long pull rod, a second upper step adapted to the upper end of the second positioning ring is provided at the bottom of the column, and a second lower step adapted to the lower end of the second positioning ring is provided on the lower bed; A second upper connecting piece is arranged at the bottom of the column, and a second lower connecting piece is arranged at the connection between the lower bed and the column. The second upper connecting piece and the second lower connecting piece are fixed by locking screws.

5. The powder forming machine according to claim 1, characterized in that: More than two level adjustment pads are arranged under the lower bed.

6. The powder forming machine according to claim 1, characterized in that: Also included is a detection component, which includes a pressure test component and a reading component; The reading assembly includes: a detection table fixed to the upper bed and a detection rod fixed to the lower bed, the top surface of the detection rod abuts against the head of the detection table and compresses the table rod on which the head is installed; the reading assembly corresponds to the locking assembly one by one, and the detection rod is arranged on one side of the corresponding locking assembly; The pressure test assembly comprises: a pressure test base fixed to the lower bed and a pressure test block fixed to the upper bed, and a second hydraulic cylinder capable of adjusting the pressure between the pressure test base and the pressure test block is arranged between the pressure test base and the pressure test block.

7. The powder forming machine according to claim 6, characterized in that: A through hole is provided on the upper bed body, a composite bearing is provided in the through hole, an outer ring of the composite bearing is fixed to the inner wall of the through hole, the top end of the detection rod extends into the inner ring of the composite bearing, and the inner diameter of the composite bearing is adapted to the outer diameter of the top of the detection rod.

8. An assembly method of a powder forming machine according to any one of claims 1 to 7, characterized in that: include: Step 1, assembling the upper bed, the column, the lower bed and the locking assembly to obtain the powder forming machine to be debugged; Step two, injecting liquid of a first preset pressure into the oil filling port through a pipeline, so that a gap is generated between the oil cylinder in each locking assembly and the second locking nut, and inserting a limit ring into the gap, wherein the thickness of the limit ring is equal to the height of the gap corresponding to it, thereby obtaining the powder forming machine.

9. The method for assembling a powder forming machine according to claim 8, characterized in that: The pulling force borne by each long pull rod in the powder forming machine is 45-55% of the maximum force of the equipment; And / or, the long pull rod is in a linear elastic deformation state.

10. A method for testing a powder forming machine according to any one of claims 1 to 7, characterized in that: include: After injecting liquids of different pressures into the second hydraulic cylinder of the powder forming machine after assembling the detection component, read the readings of the detection meter; if the linear correlation coefficients between the readings of the detection meter corresponding to each locking component and the pressure of the liquid injected into the second hydraulic cylinder are greater than the first preset value, it is a qualified product; And / or, after injecting liquid into the second hydraulic cylinder of the powder forming machine after assembling the detection component, read the readings of the detection table corresponding to each locking component. If the maximum deviation of the readings of each monitoring table is less than the second preset value, it is a qualified product.

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