CN112060664B

CN112060664B - Dry bag type isostatic pressing machine

Info

Publication number: CN112060664B
Application number: CN202010914502.0A
Authority: CN
Inventors: 王宇
Original assignee: Shanxi Jin Kai Yuan Industrial Co ltd
Current assignee: Shanxi Jin Kai Yuan Industrial Co ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2022-04-05
Anticipated expiration: 2040-09-03
Also published as: CN112060664A

Abstract

The invention discloses a dry bag type isostatic pressing machine. According to the invention, when the cabin of the dry bag type isostatic pressing machine moves to the working position which is enough to enable the mandrel to extend into the dry bag accommodated in the high-pressure cavity of the cabin, powder can be loaded into the dry bag in the high-pressure cavity of the cabin in the loading period when the end cover is opened, and can be pressed and formed in the forming period of the end cover seal, the position compensation mechanism can respond to the axial deformation of the cabin to provide position compensation for the cabin, so that the axial relative position between the mandrel and the dry bag in the high-pressure cavity of the cabin can be restrained in a preset range in the forming period, and the quality of products obtained by pressing and forming the powder is improved.

Description

Dry bag type isostatic pressing machine

Technical Field

The present invention relates to a powder processing technology, and particularly to a dry bag type isostatic press suitable for processing thin-walled large-diameter bottomed cylindrical products such as crucibles, and a control method of the dry bag type isostatic press.

Background

In the case of a thin-walled, large-diameter, bottomed cylindrical product such as a crucible, it is possible to perform press molding by placing a mandrel in a dry bag, and if the relative position between the mandrel and the dry bag cannot be kept stable during the molding period of powder pressing, the powder tends to flow and be molded in an unintended manner, which may affect the quality of the press-molded product.

Therefore, how to improve the stability of the relative position between the dry bag and the mandrel becomes a technical problem to be solved urgently in the prior art.

Disclosure of Invention

Embodiments of the present invention provide a dry bag isostatic press, and a method of controlling a dry bag isostatic press, that help improve the stability of the relative position between the dry bag and the mandrel.

In one embodiment, there is provided a dry bag isostatic press, comprising:

a subrack having a first end frame, and a second end frame disposed opposite the first end frame in a first direction;

the mandrel is fixedly arranged on the second end frame and is arranged along the first direction;

a machine bay movably disposed between the first end frame and the second end frame, wherein the machine bay has a high pressure cavity containing a dry bag and wherein the mandrel extends into the dry bag when the machine bay is moved to an operating position toward the second end frame;

the end cover is movably sleeved on the mandrel, and when the end cover moves to a sealing position towards the first end frame, the high-pressure cavity of the machine cabin in the working position and the dry bag contained in the high-pressure cavity are sealed by the end cover;

the cabin limiting mechanism is used for forming cabin axial restraint for preventing the cabin from leaving the working position by being supported between the cabin and the first end frame;

an end cap limiting mechanism for forming an end cap axial restraint that prevents the end cap from leaving the sealed position by being supported between the end cap and the second end frame;

a position compensation mechanism for providing position compensation to the housing constrained with the end cap between the housing stop mechanism and the end cap stop mechanism to constrain the axial relative position between the dry bag and the mandrel within a predetermined range.

Optionally, the frame further has a support frame connected between the first end frame and the second end frame, wherein the support frame forms a rigid constraint between the first end frame and the second end frame sufficient to constrain the axial relative position between the dry bag and the mandrel within a predetermined range during charging.

Optionally, the position compensation mechanism is further for providing position compensation to the machine housing in the working position during charging to constrain the axial relative position between the dry bag and the mandrel within a predetermined range.

Optionally, the machine cabin limiting mechanism is arranged to be in dislocation linkage with the machine cabin along a second direction intersecting the first direction, wherein when the machine cabin is in the working position, the machine cabin limiting mechanism fills in a first axial space between the machine cabin and the first end frame through movement along the second direction to form support between the machine cabin and the first end frame, and the machine cabin axial restraint is released when the machine cabin limiting mechanism moves out from the first axial space along the second direction.

Optionally, the machine cabin limiting mechanism comprises at least one first sliding block and a first power assembly for driving the first sliding block to move along the second direction.

Optionally, further comprising: and the end cover limiting mechanism is used for forming end cover axial restraint for preventing the end cover from leaving the sealing position by being supported between the end cover and the second end frame.

Optionally, the end cap retention mechanism is arranged in offset linkage with the end cap in the second direction, wherein when the end cap is in the sealed position, the end cap retention mechanism fills in a second axial space between the end cap and the second end frame by movement in the second direction to form a support between the end cap and the second end frame, and the end cap axial restraint is released when the end cap retention mechanism is moved out of the second axial space in the second direction.

Optionally, the end cover limiting mechanism includes at least one second slider and a second power assembly for driving the second slider to move along the second direction.

Optionally, further comprising: a cage drive mechanism for driving the cage to move in the first direction between the operating position and a demolding position closer to the first end frame than the operating position, wherein the mandrel is located outside the dry bag when the cage is in the demolding position; and the end cover driving mechanism is used for driving the end cover to move between the sealing position and a bin opening position which is closer to the second end frame than the sealing position along the first direction, wherein when the end cover is positioned at the bin opening position, a discharging space meeting a preset interval is formed between the end cover and the dry bag in the high-pressure cavity of the machine bin at the working position.

Optionally, the position compensation mechanism is located between the machine cabin driving mechanism and the machine cabin.

Optionally, the position compensation mechanism provides the position compensation by creating an axial tension, wherein the axial tension is used to dissipate an amount of deformation of the frame in the first direction and eliminate an axial clearance that allows the nacelle to shift in the first direction.

Optionally, further comprising: the deformation detection mechanism is used for detecting axial deformation displacement between the first end frame and the second end frame; and the control device is used for controlling the position compensation provided by the position compensation mechanism according to the axial deformation displacement.

Optionally, further comprising: a movement guide mechanism for inhibiting radial displacement of the nacelle from the first direction during movement of the nacelle in the first direction.

Optionally, the second direction is parallel to a radial direction of the mandrel.

In another embodiment, a control method of a dry bag isostatic press is provided, wherein the control method is used for controlling the dry bag isostatic press according to the previous embodiment, and the control method comprises:

in response to a first input state indicating the start of loading, generating a first drive command for moving the machine nacelle towards the second end frame to a working position sufficient to extend the mandrel into the dry bag housed in the high pressure chamber of the machine nacelle;

generating a second drive command for supporting the cabin spacing mechanism between the cabin and the first end frame to form a cabin axial restraint that prevents the cabin from leaving the operating position in response to a first response condition indicative of the cabin reaching the operating position;

generating a third drive command for moving the end cap toward the first end frame to a sealing position to seal the high pressure chamber of the machinery space and the dry bag contained therein in the working position in response to a second input condition indicative of completion of charging;

generating a first additional drive command to cause the end cap retention mechanism to be supported between the end cap and the second end frame to form an end cap axial constraint that prevents the end cap from leaving the sealed position in response to a second response condition indicating the end cap has reached the sealed position;

in response to a third input state indicative of the start of pressurization, generating a fourth drive command for causing the position compensation mechanism to provide position compensation to the machine nacelle to constrain the axial relative position between the dry bag and the mandrel within a predetermined range.

Optionally, before generating the third driving instruction, the method further includes: and generating a fifth driving command in response to a third response state that the machine cabin limiting mechanism is supported between the machine cabin and the first end frame, wherein the fifth driving command is used for enabling the position compensation mechanism of the dry bag type isostatic pressing machine to provide position compensation determined according to the axial deformation displacement for the machine cabin during charging so as to restrain the axial relative position between the dry bag and the mandrel.

Optionally, after generating the fourth driving instruction, the method further includes: generating a sixth driving instruction for causing the cabin limiting mechanism to release the cabin axial constraint in response to a fourth input state indicating unloading is complete; in response to a fourth response state indicating that the machine cabin axial restraint release is complete, generating a seventh drive command for moving the machine cabin toward the first end frame to a demolding position sufficient to position the mandrel outside the dry bag and out of the product demolding operation space.

Optionally, further comprising: generating a second additional driving instruction to enable the end cover limiting mechanism to release the axial restraint of the end cover in response to the fourth input state, the first input state or a sixth response state representing that demolding is completed; and generating an eighth driving instruction for enabling the end cover to move to an opening position towards the second end frame in response to a fifth response state indicating that the axial restraint release of the end cover is completed, wherein when the end cover is located at the opening position, a discharge space meeting a preset interval is formed between the end cover and the dry bag in the high-pressure cavity of the machine cabin in the working position.

In another embodiment, a control device for a dry bag isostatic press is provided, comprising a processor for performing the control method according to the previous embodiment.

In another embodiment, a non-transitory computer-readable storage medium is provided that stores instructions that, when executed by a processor, cause the processor to perform the control method of the preceding embodiment.

Based on the above embodiment, when the cabin of the dry bag type isostatic pressing machine moves to the working position which is enough to enable the mandrel to extend into the dry bag accommodated in the high-pressure cavity of the cabin, powder can be loaded into the dry bag in the high-pressure cavity of the cabin in the loading period when the end cover is opened, and can be pressed and formed in the forming period when the end cover is sealed, the position compensation mechanism can respond to the axial deformation of the cabin to provide position compensation for the cabin, so that the axial relative position between the mandrel and the dry bag in the high-pressure cavity of the cabin can be restrained in a preset range in the forming period, and the stability of the relative position between the dry bag and the mandrel in the pressing forming period can be improved, and the quality of products obtained by pressing and forming the powder can be improved.

Moreover, during the molding of the end cap in the sealing position, in combination with the axial restraint of the end cap by the end cap restraining mechanism, which prevents the end cap from leaving the sealing position, the position compensation provided by the position compensation mechanism can also make the axial relative position between the dry bag and the end cap synchronously restrained within a predetermined range, thereby further contributing to the stability of the relative position between the dry bag and the end cap during the press molding.

In addition, if the frame further has a support frame connected between the first and second end frames and forming a sufficiently rigid constraint between the first and second end frames, it may also contribute to the stability of the relative position between the dry bag and the mandrel during the filling; alternatively, the use of a position compensation mechanism to further provide position compensation during filling may also help to improve the stability of the relative position between the dry bag and the mandrel during filling.

Drawings

FIG. 1 is a schematic diagram of a dry bag isostatic press according to an embodiment of the invention in a charged state;

FIG. 2 is a schematic view of the dry bag isostatic press of the embodiment of FIG. 1 in a pressurized state;

FIGS. 3a and 3b are schematic views of the dry bag isostatic press of the embodiment of FIG. 1 in a demolded condition;

FIGS. 4a and 4b are schematic views of a first compensation mechanism of the position compensation mechanism of the dry bag isostatic press in the embodiment shown in FIG. 1;

FIGS. 5a and 5b are schematic diagrams of a second compensation mechanism of the position compensation mechanism of the dry bag isostatic press in the embodiment shown in FIG. 1;

FIGS. 6a and 6b are schematic diagrams of a third compensation mechanism of the position compensation mechanism of the dry bag isostatic press in the embodiment shown in FIG. 1;

FIG. 7 is a schematic flow chart illustrating a method of controlling a dry bag isostatic press according to another embodiment of the present invention;

fig. 8 is an expanded flow diagram of the control method shown in fig. 7 introduced into the demolding process.

Description of the reference numerals

10 machine frame

11 first end frame

12 second end frame

13 support frame

20 mandrel

200 bottomed tubular product

30 machine storehouse

300 machine storehouse actuating mechanism

31 high pressure chamber

32 dry bag

40 cabin stop gear

41 first slider

42 first power assembly 62

50 end cap

500 end cap driving mechanism

60 end cover limiting mechanism

61 second slide

62 second power assembly

80 position compensation mechanism

800. 800' oil pressure source

810 oil way valve

820 pressure control valve

90 control device

91 processor

92 non-transitory computer readable storage medium

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples.

FIG. 1 is a schematic diagram of a dry bag isostatic press according to one embodiment of the present invention in a charged state. Fig. 2 is a schematic view of the dry bag isostatic press of the embodiment of fig. 1 in a pressurized state. Fig. 3a and 3b are schematic structural views of the dry bag type isostatic press in a demolding state as in the embodiment of fig. 1. Referring to fig. 1 and 2, in conjunction with fig. 3a and 3b, in this embodiment, the dry bag isostatic press may include a machine frame 10, a mandrel 20, a machine bin 30, a bin stop mechanism 40, an end cap 50, an end cap stop mechanism 60, and a position compensation mechanism 80.

Subrack 10 may have a first end frame 11, and a second end frame 12 disposed opposite first end frame 11 in a first direction. In fig. 1 and 2 and fig. 3a and 3b, the first direction is taken as an example for illustration, and the first end frame 11 is located below in the vertical direction, and the second end frame 12 is located above in the vertical direction.

The mandrel 20 may be fixedly mounted (e.g., hoisted) to the second end frame 12, and the mandrel 20 is arranged in the first direction.

The machine housing 30 is movably arranged between the first end frame 11 and the second end frame 12, wherein the machine housing 30 has a high pressure chamber 31, the high pressure chamber 31 accommodates a dry bag 32 therein, and the mandrel 20 extends into the dry bag 32 when the machine housing 30 is moved towards the second end frame 12 to the working position (the position of the machine housing 30 in fig. 1 and 2).

In this embodiment, the dry bag isostatic press may further comprise a machine house drive mechanism 300 (e.g. a hydraulic mechanism), the machine house drive mechanism 300 being configured to drive the machine house 30 to move in the first direction between a working position and a demolding position (a position where the machine house 30 is located in fig. 3a and 3 b) closer to the first end frame 11 than the working position, wherein, as shown in fig. 3a and 3b, when the machine house 30 is located in the demolding position, the mandrel 20 is located outside the dry bag 32 to facilitate demolding of the bottomed cylindrical product 200 press-formed between the mandrel 20 and the dry bag 32.

The end cap 50 is movably sleeved on the mandrel 20, wherein when the end cap 50 is moved to the sealing position (the position of the end cap 50 is shown in fig. 2 and 3 a) towards the first end frame 11, as shown in fig. 2, the high pressure chamber 31 of the machine cabin 30 and the accommodated dry bag 32 in the working position are sealed by the end cap 50.

In this embodiment, the dry bag isostatic press may further comprise an end cap drive mechanism 60, the end cap drive mechanism 60 being configured to drive the end cap 50 to move in the first direction between the sealing position and an open position (the position of the end cap 50 in fig. 1 and 3 b) closer to the second end frame 12 than the sealing position, wherein, when the end cap 50 is in the open position, as shown in fig. 1, a discharge space satisfying a predetermined interval is formed between the end cap 50 and the dry bag 32 in the high pressure chamber 31 of the cabin 30 in the working position.

The nacelle-limiting mechanism 40 is configured to form a nacelle axial restraint that prevents the nacelle 30 from leaving the operating position by being supported between the nacelle 30 and the first end frame 11.

In this embodiment, the magazine stopping mechanism 40 may be arranged to be interlocked with the magazine 30 in a second direction intersecting the first direction in a dislocated manner. Here, fig. 1 and 2 and fig. 3a and 3b are each schematically expressed by taking the second direction as the horizontal direction as an example, and the horizontal direction here may be a direction parallel to the radial direction of the mandrel 20.

When the nacelle 30 is in the working position, the nacelle stopping mechanism 40 may fill in the first axial space between the nacelle 30 and the first end frame 11 by moving in the second direction to form a support between the nacelle 30 and the first end frame 11, and the nacelle axial restraint is released when the nacelle stopping mechanism 40 moves out of the first axial space in the second direction. For example, the cabin limiting mechanism 40 may include at least one first slider 41 (only two first sliders 41 are illustrated in fig. 1 and 2 and fig. 3a and 3 b), and the first slider 41 may reciprocate in the second direction under the driving of the first power assembly 42.

Because the moving direction of the machine cabin limiting mechanism 40 is a second direction intersecting with the first direction, the dry bag type isostatic pressing machine cannot generate unidirectional size increase in the first direction due to the introduction of the machine cabin limiting mechanism 40.

The end cap retention mechanism 60 is adapted to form an end cap axial restraint that prevents the end cap 50 from moving away from the sealed position by being supported between the end cap 50 and the second end frame 12. Wherein the end cap axial restraint enables the end cap 50 and the mandrel 20 to be similarly referenced to the second end bell 12.

In this embodiment, the end cap retention mechanism 60 may be arranged in a misaligned linkage with the end cap 50 in the aforementioned second direction, wherein when the end cap 50 is in the sealed position, the end cap retention mechanism 60 may fill in the second axial space between the end cap 50 and the second end frame 12 by movement in the second direction to form a support between the end cap 50 and the second end frame 12, and the end cap axial restraint may be released when the end cap retention mechanism 60 is moved out of the second axial space in the second direction. For example, the end cap limiting mechanism 60 may include at least one second slider 61 (only two second sliders 61 are illustrated in fig. 1 and 2 and fig. 3a and 3 b), and the second slider 61 may be driven by the second power assembly 62 to reciprocate in the second direction.

Like the cabin limiting mechanism 40, since the moving direction of the end cover limiting mechanism 60 is the second direction intersecting the first direction, the dry bag type isostatic press does not generate unidirectional size increase in the first direction due to the introduction of the end cover limiting mechanism 60.

The position compensation mechanism 80 is used to provide position compensation to the cartridge 30 (in the operating position) that is constrained with the end cap 50 (in the sealing position) between the cartridge stop mechanism 40 and the end cap stop mechanism 60 to constrain the axial relative position between the dry bag 32 and the mandrel 20 within a predetermined range.

For example, the position compensation mechanism 80 may be located between the cabin driving mechanism 300 and the cabin 30, and the position compensation mechanism 80 may include a controllable high-pressure cylinder or a retractable electrically-controlled support mechanism.

Thus, when the cabin 30 of the dry bag type isostatic press is moved to an operating position sufficient for the mandrel 20 to extend into the dry bag 32 contained in the high pressure chamber 31 of the cabin 30, powder can be loaded into the dry bag 32 in the high pressure chamber 31 of the cabin 30 during the loading period when the end cover 50 is open and can be pressure molded during the molding period when the end cover 50 is sealed, and the position compensation mechanism 80 can provide position compensation to the cabin in response to axial deformation of the machine frame 10, so that the axial relative position between the mandrel 20 and the dry bag 32 in the high pressure chamber 31 of the cabin 30 can be constrained within a predetermined range during the molding period, thereby contributing to improving the stability of the relative position between the dry bag 32 and the mandrel 20 during the pressure molding period and contributing to improving the quality of the product obtained by pressure molding of the powder.

Moreover, during molding when the housing 30 is in the working position and the end cap 50 is in the sealing position sealing the high pressure chamber 31 and the dry bag 32, the position compensation provided by the position compensation mechanism 80 can also synchronously constrain the axial relative position between the dry bag 32 and the end cap 50 within a predetermined range by further combining with the end cap axial constraint formed by the end cap limiting mechanism 60 to prevent the end cap from leaving the sealing position, thereby further contributing to improving the stability of the relative axial position between the dry bag 32 and the end cap 50 during press molding.

Additionally, the frame 10 may also have a support frame 13 coupled between the first end frame 11 and the second end frame 12, wherein the support frame 13 forms a rigid constraint between the first end frame 11 and the second end frame 12 sufficient to constrain the axial relative position between the dry bag 32 and the mandrel 20 within a predetermined range during charging.

When the cabin 30 of the dry bag type isostatic press is moved to a working position sufficient for the mandrel 20 to extend into the dry bag 32 contained in the high pressure chamber 31 of the cabin 30, the stability of the relative axial position of the cabin 30 with respect to the mandrel 20 during loading can be improved by the cabin axial restraint created by the cabin stop mechanism 40 that prevents the cabin 30 from leaving the working position.

Thus, in combination with the magazine limit mechanism 40 and the support frame 13, may also contribute to improving the stability of the relative position between the dry bag 32 and the mandrel 20 during the filling period; alternatively, the use of a position compensation mechanism to further provide position compensation during filling may also help to improve the stability of the relative position between the dry bag and the mandrel during compression molding during filling.

Alternatively, the position compensation mechanism 80 may be further used to provide position compensation to the magazine 30 in the working position during charging to constrain the axial relative position between the dry bag 32 and the mandrel 20 within a predetermined range.

Thus, the position compensation provided during filling by the position compensation mechanism 80 may also help to improve the stability of the relative position between the dry bag 32 and the mandrel 20 during filling.

Fig. 4a and 4b are schematic views of a first compensation mechanism of the position compensation mechanism of the dry bag isostatic press in the embodiment shown in fig. 1. Referring to fig. 4a and 4b, position compensation mechanism 80 may provide position compensation by creating an axial tension during high pressure forming, wherein the axial tension is used to consume the amount of deformation of frame 10 in the first direction and eliminate the axial clearance that allows for deflection of cartridge 30 in the first direction.

In fig. 4a and 4b, taking the example that the position compensation mechanism 80 includes the controllable high-pressure cylinder, the position compensation mechanism 80 (the controllable high-pressure cylinder) shares the same oil pressure source 800 with the high-pressure chamber 31 of the engine room 30, and the sectional area S1 of the position compensation mechanism 80 (the controllable high-pressure cylinder) is larger than the sectional area S2 of the high-pressure chamber 31 (for example, S1 is 10% -20% larger than S2), at this time, the axial force generated by the position compensation mechanism 80 (the controllable high-pressure cylinder) is larger than the engine room 30 based on the liquid supply pressure generated by the oil pressure source 800, so that the aforementioned axial tension can be formed during the molding of the engine room 30 in the working position (the end cover 50 is in the sealing position) to restrain the axial relative position between the dry bag 32 and the mandrel 20 within a predetermined range.

Fig. 4a and 4b also show a control device 90, the processor 91 of which control device 90 triggers the automatic position compensation of the position compensation mechanism 80 (controllable high-pressure cylinder) on the nacelle 30 by controlling the pressure supply of the hydraulic source 800. The processor 91 of the control device 90 may be further configured to generate various driving instructions to control the machine cabin driving mechanism 300, the machine cabin limiting mechanism 40, the end cover driving mechanism 500, the end cover limiting mechanism 60, and the position compensating mechanism 80 to complete the pressing of the bottomed tubular product 200 according to a predetermined process flow. To this end, a control method for the processor 91 to execute is provided in the following embodiments.

For the example shown in fig. 4a and 4b, the stability of the relative position between the dry bag 32 and the mandrel 20 during the filling process can be ensured by the magazine limit mechanism 40 and the support frame 13.

Fig. 5a and 5b are schematic diagrams of a second compensation mechanism of the position compensation mechanism of the dry bag isostatic press in the embodiment shown in fig. 1. Referring to fig. 5a and 5b, the position compensation mechanism 80 can still provide position compensation by creating axial tension, but unlike the first compensation mechanism shown in fig. 4a and 4b, in the second compensation mechanism shown in fig. 5a and 5b, the position compensation mechanism 80 can provide position compensation not only during high pressure forming, but also during charging:

first, the processor 91 of the control device 90 may control the hydraulic source 800 to provide a flow supply of a preset pressure to the position compensating mechanism 80 (controllable high-pressure cylinder) during the charging period (for example, the flow supply may be determined according to a change in the distance between the first end frame 11 and the second end frame 12) to adjust the axial position of the cabin 30 during the charging period (the end cover 50 does not reach the sealing position) in the working position. The oil pressure source 800 may autonomously stop the flow supply from returning to maintain the adjusted axial position of the nacelle 30, or may stop the flow supply from returning to maintain the adjusted axial position by the pressure control valve 820. Also, whether the back flow prevention of the flow supply is controlled automatically by the oil pressure source 800 or by the pressure control valve 820, the supply may be stepwise in steps of a relatively small preset flow unit to gradually bring the axial position of the nacelle 30 to a desired position.

During the charging period, the oil valve 810 between the oil pressure source 800 and the engine room 30 is closed.

Then, the processor 91 of the control device 90 may control the oil valve 810 to open, so that the oil pressure source 800 simultaneously provides pressure supply to the high pressure chamber 31 of the machine cabin 30 and the position compensation mechanism 80 (controllable high pressure cylinder), and since the sectional area S1 of the position compensation mechanism 80 (controllable high pressure cylinder) is larger than the sectional area S2 of the high pressure chamber 31, the axial tension generated by the position compensation mechanism 80 (controllable high pressure cylinder) is larger than that of the machine cabin 30, so that the axial tension may be continuously formed during the molding of the machine cabin 30 in the working position (the end cover 50 is in the sealing position) to restrain the axial relative position between the dry bag 32 and the mandrel 20 within a predetermined range.

Fig. 6a and 6b are schematic diagrams of a third compensation mechanism of the position compensation mechanism of the dry bag isostatic press in the embodiment shown in fig. 1. Referring to fig. 6a and 6b, the position compensation mechanism 80 can still provide position compensation by generating axial tension, but unlike the second compensation mechanism shown in fig. 5a and 5b, in the third compensation mechanism shown in fig. 6a and 6b, different oil pressure sources 800 and 800 'can be used for the position compensation mechanism 80 and the machine cabin 30, respectively, and at this time, the sectional area of the position compensation mechanism 80 (controllable high pressure cylinder) can not be required to be set larger than that of the high pressure chamber 31, and the axial force generated by the position compensation mechanism 80 (controllable high pressure cylinder) can be larger than that of the machine cabin 30 by controlling the different oil pressure sources 800 and 800', respectively. Also, in fig. 6a and 6b, the control oil valve 810 may also be omitted, and the pressure control valve 820 may alternatively be provided for the oil pressure source 800' for providing the flow supply to the position compensation mechanism 80.

In addition, the dry bag isostatic press may further comprise a deformation detection mechanism for detecting an axial deformation displacement between the first end frame 11 and the second end frame 12. For example, the deformation detecting mechanism 70 may include a sensing element such as a strain gauge, a grating displacement sensor, or the like, and may determine the axial deformation displacement between the first end frame 11 and the second end frame 12 by detecting the change in the length of the support frame 13 and the degree of bending of the first end frame 11 and the second end frame 12.

Also shown in figures 4a and 4b and 5a and 5b and 6a and 6b is a control device 90, the processor 91 of the control device 90 may be in the molding period when the magazine 30 is in the working position (the end cover 50 is in the sealing position), or in the charging period when the magazine 30 is in the working position (the end cover 50 does not reach the sealing position) and in the molding period (the end cover 50 is in the sealing position), the position compensation provided to the housing 30 by the displacement compensation mechanism 80 is controlled in accordance with the axial deformation displacement detected by the deformation detecting mechanism 70, and, the processor 91 of the control device 90 may also be configured to generate various driving instructions to control the machine cabin driving mechanism 300, the machine cabin limiting mechanism 40, the end cover driving mechanism 500, the end cover limiting mechanism 60, and the position compensating mechanism 80 to complete the pressing of the bottomed tubular product 200 according to a predetermined process flow. To this end, a control method for the processor 91 to execute is provided in the following embodiments.

Fig. 7 is a schematic flow diagram illustrating a method of controlling a dry bag isostatic press according to another embodiment of the invention. Referring to fig. 7, the control method of the dry bag type isostatic pressing machine in this embodiment may include:

s710: in response to a first input condition indicative of the start of loading, a first drive command is generated for moving a machine house of the dry bag isostatic press towards a second end frame to a working position sufficient to extend the mandrel into a dry bag housed in a high pressure chamber of the machine house.

S730: and generating a second driving command in response to a first response state indicating that the machine cabin reaches the working position, wherein the second driving command is used for enabling a machine cabin limiting mechanism of the dry bag type isostatic pressing machine to be supported between the machine cabin and the first end frame so as to form axial restraint of the machine cabin, and the axial restraint of the machine cabin prevents the machine cabin from leaving the working position.

The driving effects of the first driving instruction and the second driving instruction generated in the above steps S710 and S730 in sequence can be seen in fig. 1. Wherein, under the state as shown in figure 1, the end cover is at the position of opening the storehouse, at this moment, the end cover and the dry bag in the high-pressure chamber of the machine storehouse in the working position form the blow space meeting the preset interval, in order to fill the powder in the dry bag.

S750: in response to a second input condition indicative of completion of the charging, a third drive command is generated for moving an end cap of the dry bag isostatic press toward the first end frame to a sealing position to seal the high pressure chamber of the cabinet and the dry bag contained therein in the working position.

The driving effect of the third driving command generated in step S750 can be seen in fig. 2. At this point, the chamber pressure within the high pressure chamber may begin to rise to a specified pressure rise.

And, after S750, may also generate a first additional drive command to cause an end cap retention mechanism of the dry bag isostatic press to be supported between the end cap and the second end frame to form an end cap axial restraint that prevents the end cap from leaving the sealing position in response to a second response condition indicating the end cap reaches the sealing position.

S770: and generating a fourth driving command in response to a third input state indicating the start of pressurization, wherein the fourth driving command is used for enabling the position compensation mechanism of the dry bag type isostatic pressing machine to provide position compensation determined according to the axial deformation displacement for the machine cabin so as to restrain the axial relative position between the dry bag and the mandrel within a preset range.

Wherein for a first compensation mechanism as shown in fig. 4a and 4b, and a second compensation mechanism as shown in fig. 5a and 5b, a fourth drive command for triggering position compensation during molding may trigger pressurization of the high pressure chamber and activation of the position compensation mechanism simultaneously; for the third compensation scheme as shown in fig. 6a and 6b, a fourth drive command for triggering position compensation during forming may trigger the processor on the axial deformation displacement detected by the deformation detection mechanism and subsequent control logic.

The driving effect of the fourth driving command generated at the above step S770 can be seen as indicated by the double-headed dashed arrow in the longitudinal direction in fig. 2.

Based on the above process, when the cabin of the dry bag type isostatic pressing machine moves to the working position which is enough to enable the mandrel to extend into the dry bag accommodated in the high-pressure cavity of the cabin, powder can be loaded into the dry bag in the high-pressure cavity of the cabin in the loading period when the end cover is opened, and can be pressed and formed in the forming period when the end cover is sealed, and the position compensation mechanism can respond to the axial deformation of the cabin to provide position compensation for the cabin, so that the axial relative position between the mandrel and the dry bag in the high-pressure cavity of the cabin can be restrained in a preset range in the forming period, thereby improving the stability of the relative position between the dry bag and the mandrel in the pressing forming period and improving the quality of products obtained by pressing and forming the powder.

And, for the second compensation mechanism as shown in fig. 5a and 5b, and the third compensation mechanism as shown in fig. 6a and 6b, before S750, in response to the third response state that the machine cabin limiting mechanism is supported between the machine cabin and the first end frame, generating a fifth driving command for causing the position compensation mechanism of the dry bag type isostatic press to provide position compensation determined according to the axial deformation displacement to the machine cabin during charging so as to restrain the axial relative position between the dry bag and the mandrel within a predetermined range.

Fig. 8 is an expanded flow diagram of the control method shown in fig. 7 introduced into the demolding process. Referring to fig. 8, the control method shown in fig. 7 may be extended to include S810, S830, S850, and S870, which are substantially the same as S710, S730, S750, and S770, respectively, and the control method may further include the following steps after S870:

s891: and generating a sixth driving command for enabling the cabin limiting mechanism to release the cabin axial constraint in response to a fourth input state indicating unloading is completed.

S893: in response to a fourth response state indicating that the machine compartment axial restraint release is complete, a seventh drive command is generated for moving the machine compartment toward the first end frame to a stripping position sufficient to position the mandrel outside the dry bag and clear the product stripping operating space.

The driving effect of the sixth driving command and the seventh driving command generated in sequence in steps S891 and S893 can be seen in any one of fig. 3a and fig. 3 b.

In fig. 3a, the end cap still remains in the sealing position, so that when the next processing is performed in the flow shown in fig. 4 or fig. 5, the control method may further:

responding to the first input state, generating a second additional driving instruction, and enabling the end cover limiting mechanism to release the axial restraint of the end cover;

in response to a fifth response condition indicating the end cap axial restraint release is complete, generating an eighth drive command for moving the end cap toward the second end frame to an open position.

In fig. 3b, the end cap is driven to the open position, i.e. the above-mentioned second additional drive command may also be generated in response to a sixth response state after the seventh drive command indicating that demoulding is complete.

As another alternative, the second additional drive command may also be generated in response to a fourth input state indicating that unloading is complete.

Additionally, as can also be seen in fig. 4a and 4b, fig. 5a and 5b, and fig. 6a and 6b, the control device 90 may further include a non-transitory computer-readable storage medium 92, the non-transitory computer-readable storage medium 92 may store instructions, at least a portion of which, when executed by the processor 91, may cause the processor 91 to perform the control method as described in the previous embodiments.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A dry bag isostatic press, comprising:

a position compensation mechanism for providing position compensation to the magazine confined with the end cap between the magazine spacing mechanism and the end cap spacing mechanism during forming to constrain the axial relative position between the dry bag and the mandrel within a predetermined range.

2. The dry bag isostatic press according to claim 1, wherein said machine frame further has a support frame connected between said first end frame and said second end frame, wherein said support frame forms a rigid constraint between said first end frame and said second end frame, said rigid constraint being sufficient to constrain the axial relative position between said dry bag and said mandrel within a predetermined range during charging.

3. The dry bag isostatic press according to claim 1, wherein said position compensation mechanism is further adapted to provide position compensation to said machine housing in said working position during charging to constrain the axial relative position between said dry bag and said mandrel within a predetermined range.

4. The dry bag isostatic press according to claim 1,

the machine cabin limiting mechanism is arranged to be in dislocation linkage with the machine cabin along a second direction intersecting with the first direction, wherein when the machine cabin is in the working position, the machine cabin limiting mechanism is filled in a first axial space between the machine cabin and the first end frame through movement along the second direction so as to form support between the machine cabin and the first end frame, and the machine cabin axial constraint is released when the machine cabin limiting mechanism moves out of the first axial space along the second direction;

the end cap retention mechanism is arranged in offset linkage with the end cap in the second direction, wherein when the end cap is in the sealed position, the end cap retention mechanism fills in a second axial space between the end cap and the second end frame by movement in the second direction to form a support between the end cap and the second end frame, and wherein the end cap axial restraint is released when the end cap retention mechanism is moved out of the second axial space in the second direction.

5. The dry bag isostatic press according to claim 1, further comprising:

a cage drive mechanism for driving the cage to move in the first direction between the operating position and a demolding position closer to the first end frame than the operating position, wherein the mandrel is located outside the dry bag when the cage is in the demolding position;

and the end cover driving mechanism is used for driving the end cover to move between the sealing position and a bin opening position which is closer to the second end frame than the sealing position along the first direction, wherein when the end cover is positioned at the bin opening position, a discharging space meeting a preset interval is formed between the end cover and the dry bag in the high-pressure cavity of the machine bin at the working position.

6. The dry bag isostatic press according to claim 5, wherein said position compensation mechanism is located between said cabin drive mechanism and said cabin.

7. The dry bag isostatic press according to claim 1, wherein said position compensation mechanism provides said position compensation by creating an axial tension, wherein said axial tension is used to consume the amount of deformation of said machine frame in said first direction and eliminate the axial clearance allowing the machine bin to shift in said first direction.

8. The dry bag isostatic press according to claim 1, further comprising:

the deformation detection mechanism is used for detecting axial deformation displacement between the first end frame and the second end frame;

and the control device is used for controlling the position compensation provided by the position compensation mechanism according to the axial deformation displacement.

9. The dry bag isostatic press according to claim 1, further comprising:

a movement guide mechanism for inhibiting radial displacement of the nacelle from the first direction during movement of the nacelle in the first direction.

10. A control method for a dry bag isostatic press, wherein the control method is used for controlling a dry bag isostatic press according to claim 1, and wherein the control method comprises: