CN111014663A - Powder forming press and protection demoulding hydraulic control system thereof - Google Patents
Powder forming press and protection demoulding hydraulic control system thereof Download PDFInfo
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- CN111014663A CN111014663A CN201911267491.5A CN201911267491A CN111014663A CN 111014663 A CN111014663 A CN 111014663A CN 201911267491 A CN201911267491 A CN 201911267491A CN 111014663 A CN111014663 A CN 111014663A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Presses (AREA)
Abstract
The invention belongs to the field of powder forming. The invention provides a protective demoulding hydraulic control system of a powder forming press, which comprises a main oil pump, an upper oil cylinder, a lower oil cylinder, an oil tank, a demoulding hydraulic pump, a first reversing valve, a second reversing valve, a third reversing valve, a fourth reversing valve and an auxiliary demoulding oil path. Has the advantages that: according to the invention, the stroke of the upper punch and the lower punch is controlled by the demolding hydraulic pump, the third reversing valve, the fourth reversing valve and the auxiliary demolding oil way, and the increase process of the distance between the upper oil cylinder and the lower oil cylinder is accurately controlled by the demolding hydraulic pump, so that the occurrence of layering, cracking and corner falling of a pressed blank caused by unreasonable internal stress release in the pressing blank protection demolding process is reduced. The invention also discloses a powder forming press comprising the protective demolding hydraulic control system.
Description
Technical Field
The invention belongs to the field of powder forming, and relates to a protective demolding hydraulic control system of a powder forming press. In addition, the invention also relates to a powder forming press comprising the hydraulic control system for protecting the demoulding.
Background
The rare earth permanent magnetic powder forming process is to make the original apparent density 1.5-2.5 g/cm3Pressing to 3.0-5.0 g/cm3Since the formed pressed blank has internal stress, if there is no protection during the demolding processAnd (3) demolding, namely, the upper punch of the upper oil cylinder of the powder molding press is firstly lifted to the original point, and the lower punch of the lower oil cylinder of the powder molding press directly pushes against the pressed blank to demold, so that the direction of the non-pressed surface of the pressed blank expands to release pressure due to the internal stress in the pressed blank, and the pressed blank is layered and cracked.
Therefore, the powder forming press has a high requirement for controlling the protective stripping in the blank pressing process, and the protective stripping is to apply a certain pressure to the pressed blank in the height direction in the stripping process after the pressed blank is pressed, so as to prevent the pressed blank from cracking in the stripping process due to the too fast release of the internal stress of the formed pressed blank, and it is very important to control the surface pressure of the pressed blank and release the internal stress of the pressed blank.
The multi-purpose cylinder device of the demoulding protection device of the existing powder moulding press is pressed on the surface of a pressed blank, and demoulding protection is carried out by controlling the pressure of a cylinder, but the protection force of the device has the problem of relative instability, the protection demoulding force is large, vertical cracking or crushing after direct demoulding occurs during moulding, the protection demoulding force is small, and transverse cracking occurs. The problems of layering, cracking and corner falling of a pressed blank caused by unreasonable internal stress release of a powder forming press in the process of protecting and demolding often occur, so that the qualification rate of products is low, and the forming difficulty of the products is increased.
Disclosure of Invention
The invention aims to provide a protection demoulding hydraulic control system of a powder forming press, which can reduce the problems of layering, cracking and corner falling of a pressed blank caused by unreasonable internal stress release in the protection demoulding process of the pressed blank and improve the qualification rate of products. It is another object of the present invention to provide a powder forming press including the above-described protective stripping hydraulic control system.
In order to solve the technical problem, the invention provides a protective demolding hydraulic control system of a powder molding press, which comprises a main oil pump, an upper oil cylinder, a lower oil cylinder, an oil tank, a demolding hydraulic pump, a first reversing valve, a second reversing valve, a third reversing valve, a fourth reversing valve and an auxiliary demolding oil way.
An oil inlet P of the first reversing valve is communicated with an oil outlet of the main oil pump; a working oil port A of the first reversing valve is communicated with a rodless cavity of the upper oil cylinder; the working oil port A of the first reversing valve is communicated with the oil inlet P of the fourth reversing valve; the working oil port B of the first reversing valve is communicated with the oil return port T of the fourth reversing valve; and a working oil port B of the fourth reversing valve is communicated with a rod cavity of the upper oil cylinder.
An oil inlet P of the second reversing valve is communicated with an oil outlet of the main oil pump; a working oil port A of the second reversing valve is communicated with a rod cavity of the lower oil cylinder; and a working oil port B of the second reversing valve is communicated with a rodless cavity of the lower oil cylinder.
An oil inlet P of the third reversing valve is communicated with an oil outlet of the main oil pump; and a working oil port B of the third reversing valve is communicated with a rodless cavity of the lower oil cylinder.
An oil outlet of the demolding hydraulic pump is connected with an auxiliary demolding oil path, and a rod cavity of the lower oil cylinder is connected with an oil return port T of the fourth reversing valve through the auxiliary demolding oil path.
And oil return ports T of the first reversing valve, the second reversing valve and the third reversing valve are communicated with an oil tank.
Preferably, the first reversing valve is a three-position four-way electromagnetic valve, when the first reversing valve is located at a first station, an oil inlet P of the first reversing valve is communicated with a working oil port a, a working oil port B is communicated with an oil return port T, and hydraulic oil can enter a rodless cavity of the upper oil cylinder; when the first reversing valve is positioned at the second station, the oil inlet P of the first reversing valve is communicated with the working oil port B, and the working oil port A of the first reversing valve is communicated with the oil return port T; when the first reversing valve is positioned at the third station, the working oil port A of the first reversing valve is communicated with the oil return port T, the oil inlet P is stopped, and the working oil port B is stopped.
Preferably, the second reversing valve is a three-position four-way electromagnetic valve, when the second reversing valve is positioned at the first station, an oil inlet P of the second reversing valve is communicated with a working oil port B, and hydraulic oil can enter a rodless cavity of the lower oil cylinder; when the second reversing valve is positioned at a second station, an oil inlet P of the second reversing valve is communicated with the working oil port A, and hydraulic oil can enter a rod cavity of the lower oil cylinder; and when the second reversing valve is in the third station, the second reversing valve is in a stop state.
Preferably, the third reversing valve is a two-position four-way electromagnetic valve, and when the third reversing valve is in the first station, the third reversing valve is in a stop state; when the third reversing valve is positioned at the second station, the oil inlet P of the third reversing valve is communicated with the working oil port B, hydraulic oil can enter the rodless cavity of the lower oil cylinder, and the working oil port A of the third reversing valve is in a cut-off state.
Preferably, the fourth reversing valve is a two-position four-way electromagnetic valve, and when the fourth reversing valve is positioned at the first station, an oil inlet P of the fourth reversing valve is communicated with the working oil port B; and when the fourth reversing valve is positioned at the second station, an oil return port T of the fourth reversing valve is communicated with the working oil port B.
Preferably, a one-way valve and an overflow valve are arranged between the main oil pump and the first reversing valve, the second reversing valve and the third reversing valve.
Preferably, an adjusting valve is arranged on an oil path between the third reversing valve and the lower oil cylinder.
Preferably, the demolding hydraulic pump is a micro pump and is driven by a motor. The motor can be a direct current speed regulating motor, a servo motor or a variable frequency motor. The flow rate of the micro pump is 1-500 ml/min.
The invention provides a powder forming press, which comprises a protective demolding hydraulic control system, wherein the protective demolding hydraulic control system is specifically any one of the protective demolding hydraulic control systems.
Has the advantages that:
according to the invention, the stroke of the upper punch and the lower punch is controlled by a demolding hydraulic pump, a third reversing valve, a fourth reversing valve and an auxiliary demolding oil circuit, the process of increasing the distance between the upper cylinder and the lower cylinder is accurately controlled by a micro pump, and the optimal demolding protection effect is achieved by adjusting the flow of the micro pump and the starting and ending time of the action of the micro pump according to different performances of the pressed blank, so that the layering, cracking and corner falling of the pressed blank caused by unreasonable internal stress release in the process of protecting and demolding the pressed blank are reduced. The invention has the advantages of convenient control, high precision and good demoulding effect.
Drawings
FIG. 1 is a hydraulic schematic diagram of one embodiment of a protective stripping hydraulic control system provided by the present invention;
in the figure: 1-main oil pump, 2-upper oil cylinder, 3-lower oil cylinder, 4-demoulding hydraulic pump, 5-first reversing valve, 6-second reversing valve, 7-third reversing valve, 8-fourth reversing valve, 9-auxiliary demoulding oil circuit, 10-one-way valve, 11-overflow valve, 12-regulating valve, 13-motor and 14-oil tank.
Detailed Description
The invention is further described below with reference to the figures and examples.
Examples
The invention provides a protective demoulding hydraulic control system of a powder forming press, which comprises a main oil pump 1, an upper oil cylinder 2, a lower oil cylinder 3, an oil tank 14, a demoulding hydraulic pump 4, a first reversing valve 5, a second reversing valve 6, a third reversing valve 7, a fourth reversing valve 8 and an auxiliary demoulding oil path 9, as shown in figure 1. And oil inlets P of the first reversing valve 5, the second reversing valve 6, the third reversing valve 7 and the fourth reversing valve 8 are communicated with an oil outlet of the main oil pump 1. Wherein the main oil pump 1 and the demoulding hydraulic pump 4 are driven by a motor 13. The motor 13 may be a dc speed-regulating motor, a servo motor, or a variable frequency motor.
A working oil port A of the first reversing valve 5 is communicated with a rodless cavity of the upper oil cylinder 2; a working oil port A of the first reversing valve 5 is communicated with an oil inlet P of a fourth reversing valve 8; a working oil port B of the first reversing valve 5 is communicated with an oil return port T of the fourth reversing valve 8; and a working oil port B of the fourth reversing valve 8 is communicated with a rod cavity of the upper oil cylinder 2.
A working oil port A of the second reversing valve 6 is communicated with a rod cavity of the lower oil cylinder 3; a working oil port B of the second reversing valve 6 is communicated with a rodless cavity of the lower oil cylinder 3;
a working oil port B of the third reversing valve 7 is communicated with a rodless cavity of the lower oil cylinder 3;
the oil outlet of the demolding hydraulic pump 4 is connected with an auxiliary demolding oil path 9, and the rod cavity of the lower oil cylinder 3 is connected with the oil return port T of the fourth reversing valve 8 through the auxiliary demolding oil path 9.
And oil return ports T of the first reversing valve 5, the second reversing valve 6 and the third reversing valve 7 are communicated with an oil tank 14.
In order to adjust the demoulding speed, an adjusting valve 12 is arranged on an oil path between the third reversing valve 7 and the lower oil cylinder 3.
Specifically, the first reversing valve 5 is a three-position four-way electromagnetic valve, when the first reversing valve 5 is positioned at a first station, the 2DT is electrified, an oil inlet P of the first reversing valve is communicated with a working oil port A, a working oil port B is communicated with an oil return port T, and hydraulic oil can enter a rodless cavity of the upper oil cylinder 2; when the first reversing valve 5 is positioned at the second station, the 1DT is electrified, the oil inlet P of the first reversing valve is communicated with the working oil port B, the working oil port A of the first reversing valve is communicated with the oil return port T, hydraulic oil can enter the rod cavity of the upper oil cylinder 2, and hydraulic oil in the rodless cavity of the upper oil cylinder 2 flows back to the oil tank 14; when the first reversing valve 5 is positioned at the third station, the 1DT and the 2DT are powered off, the working oil port A is communicated with the oil return port T, the oil inlet P is closed, the working oil port B is closed, at the moment, the demoulding protection state is realized, and the hydraulic oil in the rodless cavity of the upper oil cylinder 2 flows back to the oil tank 14.
Specifically, the second reversing valve 6 is a three-position four-way electromagnetic valve, the 3DT is powered when the second reversing valve 6 is positioned at the first station, an oil inlet P of the second reversing valve is communicated with a working oil port B, and hydraulic oil can enter a rodless cavity of the lower oil cylinder 3; when the second reversing valve 6 is positioned at the second station, the 4DT is electrified, the oil inlet P of the second reversing valve is communicated with the working oil port A, and hydraulic oil can enter the rod cavity of the lower oil cylinder 3; when the second reversing valve 6 is positioned at the third station, the 3DT and the 4DT are powered off, the three-position four-way electromagnetic valve is in a stop state, and hydraulic oil cannot pass through the three-position four-way electromagnetic valve.
Specifically, the third reversing valve 7 is a two-position four-way electromagnetic valve, and when the third reversing valve 7 is in the first station, the third reversing valve is in a stop state, and hydraulic oil cannot pass through the third reversing valve; when the third reversing valve 7 is positioned at the second station, the 5DT is electrified, the oil inlet P of the third reversing valve is communicated with the working oil port B, the working oil port A of the third reversing valve is stopped, and hydraulic oil can enter the rodless cavity of the lower oil cylinder 3 and is in a protective demoulding state.
Specifically, the fourth reversing valve 8 is a two-position four-way electromagnetic valve, the 6DT is electrified when the fourth reversing valve 8 is positioned at the first station, and an oil inlet P of the fourth reversing valve is communicated with the working oil port B; when the fourth reversing valve 8 is positioned at the second station, the oil return port T is communicated with the working oil port B, and the working oil port A is cut off.
For safety, a check valve 10 and a relief valve 11 may be provided between the first direction valve 5, the second direction valve 6, the third direction valve 7, and the main oil pump 1.
The demolding hydraulic pump 4 is a micro pump. The flow of the micro pump can be 1-500ml/min, and the specific value can be adjusted dynamically and properly according to the performance requirement of the pressed blank by the motor 13 of the demoulding hydraulic pump 4.
The working process is as follows:
when the upper oil cylinder 2 of the powder molding press needs to rapidly move downwards, the main oil pump 1 is started, and the demolding hydraulic pump 4 is not started; the third reversing valve 7 is positioned at the first station, and hydraulic oil cannot pass through the third reversing valve 7; the first reversing valve 5 is located at the first station, namely 2DT gets electricity, its oil inlet P communicates with the working oil port A, hydraulic oil in the main oil pump 1 enters the rodless cavity of the upper oil cylinder 2, and the fourth reversing valve 8 is located at the first station 6DT and gets electricity simultaneously, the oil inlet P of the fourth reversing valve 8 communicates with the working oil port B, hydraulic oil that the hydraulic oil that has the pole cavity to come out from the upper oil cylinder 2 superposes the main oil pump 1 and supplies flows into the rodless cavity of the upper oil cylinder 2, make the upper oil cylinder 2 move down fast, save the time that moves down.
When the powder molding press needs a counter-pressure state, the main oil pump 1 is started, and the demolding hydraulic pump 4 is not started; the third reversing valve 7 is positioned at the first station, and hydraulic oil cannot pass through the third reversing valve 7; the first reversing valve 5 is positioned at the first station 2DT and is electrified, the oil inlet P is communicated with the working oil port A, the working oil port B is communicated with the oil return port T, the fourth reversing valve 8 is positioned at the second station 6DT and is electrified, and the hydraulic oil in the rod cavity of the upper oil cylinder 2 flows back to the oil tank 14; meanwhile, when the second reversing valve 6 is positioned at the first station, the 3DT is electrified, the oil inlet P of the second reversing valve is communicated with the working oil port B, the working oil port A is communicated with the oil return port T, hydraulic oil can enter the rodless cavity of the lower oil cylinder 3, and the hydraulic oil flowing out of the rod cavity of the lower oil cylinder 3 flows back to the oil tank 14.
After the counter-pressing of the upper punch and the lower punch is finished, the distance between the upper punch and the lower punch is the pressing height of the pressed blank, and when the pressed blank needs to be moved out of the die cavity, the powder forming press performs a protective demoulding process to enable the pressed blank to release certain internal stress. At the moment, the main oil pump 1 is started, and the demoulding hydraulic pump 4 is started; the third reversing valve 7 is positioned at the second station 5DT and is electrified, the first reversing valve 5 is positioned at the third station 1DT and 2DT and is electrified, the second reversing valve 6 is positioned at the third station 3DT and 4DT and is electrified, and the fourth reversing valve 8 is positioned at the second station 6DT and is electrified. Hydraulic oil from the main oil pump 1 enters a rodless cavity of the lower oil cylinder 3 through the fourth reversing valve 8, and the lower oil cylinder 3 moves upwards; hydraulic oil from the rod cavity of the lower oil cylinder 3 enters the rod cavity of the upper oil cylinder 2 through the auxiliary demoulding oil path 9 and the fourth reversing valve 8, and the upper oil cylinder 2 moves upwards; the hydraulic oil from the rodless cavity of the upper oil cylinder 2 passes through the first reversing valve 5, the first reversing valve 5 is at the third station at the moment, and the working oil port A is communicated with the oil return port T and flows back to the oil tank 14; because the demoulding hydraulic pump 4 is started, the hydraulic oil from the demoulding hydraulic pump 4 also enters the auxiliary demoulding oil circuit 9, the flow of the hydraulic oil entering the rod cavity of the upper oil cylinder 2 and the flow of the hydraulic oil from the rod cavity of the lower oil cylinder 3 are superposed, the oil supply flow of the hydraulic oil from the rod cavity of the lower oil cylinder 3 is larger than the flow of the hydraulic oil flowing into the rodless cavity of the lower oil cylinder 3, the moving speed of the upper oil cylinder 2 is slightly higher than the moving speed of the lower oil cylinder 3, the gap between the upper punch of the upper oil cylinder 2 and the lower punch of the lower oil cylinder is slowly increased, but because the formed pressed blank has internal stress, the gap between the upper punch and the lower punch of the lower oil cylinder is increased, the height (between the upper punch and the lower punch) direction of the pressed blank can be increased, when the upper punch of the upper oil cylinder 2 leaves the pressed surface, the internal stress is released, the pressed blank after being formed can be instantly expanded, and, therefore, the internal stress of the formed pressed blank is gradually released in the demoulding process, and when the formed pressed blank is moved out of the die cavity, the internal stress of the pressed blank is fully released. At this time, the upper punch of the upper oil cylinder 2 can leave the surface of the pressed blank, and demoulding is finished. The lower oil cylinder 3 moves downwards and returns to the initial position.
According to the invention, the demoulding hydraulic pump 4 is a micropump, the distance increasing process of the upper punch and the lower punch of the upper oil cylinder and the lower oil cylinder is accurately controlled by the micropump, and the speed of releasing the internal stress of the pressed blank in the demoulding process is more gentle by adjusting the flow of the micropump and the starting and ending time of the action of the micropump according to different performances of the pressed blank, so that the optimal demoulding protection effect is achieved, the phenomena of layering, cracking and corner falling of the pressed blank caused by unreasonable release of the internal stress in the demoulding process of the pressed blank protection can be greatly reduced, the qualification rate of products is higher, and the difficulty of forming the products is also reduced. The hydraulic control system for protecting demoulding has the advantages of simple control process, high precision and good effect of protecting demoulding.
The demoulding hydraulic pump can be replaced by a small oil cylinder driven by a servo motor or a variable frequency motor, and the small oil cylinder is used for quantitatively and controllably supplementing oil to a rod cavity of the upper oil cylinder in the process of protecting demoulding, so that the effect equivalent to that of a micro pump is achieved.
In addition to the above-mentioned hydraulic control system for protecting demolding, the specific embodiment of the present invention further provides a powder molding press including the above-mentioned hydraulic control system for protecting demolding, and the structure of other parts of the powder molding press is referred to the prior art and is not described herein again.
The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention.
Claims (10)
1. A protection demoulding hydraulic control system of a powder forming press comprises a main oil pump (1), an upper oil cylinder (2), a lower oil cylinder (3) and an oil tank (14), and is characterized by further comprising a demoulding hydraulic pump (4), a first reversing valve (5), a second reversing valve (6), a third reversing valve (7), a fourth reversing valve (8) and an auxiliary demoulding oil path (9);
an oil inlet P of the first reversing valve (5) is communicated with an oil outlet of the main oil pump (1); a working oil port A of the first reversing valve (5) is communicated with a rodless cavity of the upper oil cylinder (2); a working oil port A of the first reversing valve (5) is communicated with an oil inlet P of a fourth reversing valve (8); a working oil port B of the first reversing valve (5) is communicated with an oil return port T of the fourth reversing valve (8); a working oil port B of the fourth reversing valve (8) is communicated with a rod cavity of the upper oil cylinder (2);
an oil inlet P of the second reversing valve (6) is communicated with an oil outlet of the main oil pump (1); a working oil port A of the second reversing valve (6) is communicated with a rod cavity of the lower oil cylinder (3); a working oil port B of the second reversing valve (6) is communicated with a rodless cavity of the lower oil cylinder (3);
an oil inlet P of the third reversing valve (7) is communicated with an oil outlet of the main oil pump (1); a working oil port B of the third reversing valve (7) is communicated with a rodless cavity of the lower oil cylinder (3);
an oil outlet of the demolding hydraulic pump (4) is connected with an auxiliary demolding oil way (9), and a rod cavity of the lower oil cylinder (3) is connected with an oil return port T of the fourth reversing valve (8) through the auxiliary demolding oil way (9);
and oil return ports T of the first reversing valve (5), the second reversing valve (6) and the third reversing valve (7) are communicated with an oil tank (14).
2. The hydraulic control system for protecting demolding according to claim 1, wherein the first reversing valve (5) is specifically a three-position four-way electromagnetic valve, when the first reversing valve (5) is in a first station, an oil inlet P of the first reversing valve (5) is communicated with a working oil port A, a working oil port B is communicated with an oil return port T, and hydraulic oil can enter a rodless cavity of the upper oil cylinder (2); when the first reversing valve (5) is positioned at a second station, an oil inlet P of the first reversing valve (5) is communicated with a working oil port B, and the working oil port A is communicated with an oil return port T; when the first reversing valve (5) is located at the third station, the working oil port A of the first reversing valve (5) is communicated with the oil return port T, the oil inlet P is cut off, and the working oil port B is cut off.
3. The hydraulic control system for protecting demolding according to claim 1, wherein the second reversing valve (6) is specifically a three-position four-way electromagnetic valve, when the second reversing valve (6) is located at the first station, an oil inlet P of the second reversing valve (6) is communicated with a working oil port B, and hydraulic oil can enter a rodless cavity of the lower oil cylinder (3); when the second reversing valve (6) is positioned at a second station, an oil inlet P of the second reversing valve (6) is communicated with the working oil port A, and hydraulic oil can enter a rod cavity of the lower oil cylinder (3); and when the second reversing valve (6) is in the third station, the second reversing valve (6) is in a stop state.
4. The hydraulic control system for protecting demoulding according to claim 1, wherein the third reversing valve (7) is a two-position four-way solenoid valve, and when the third reversing valve (7) is in the first station, the third reversing valve (7) is in a cut-off state; when the third reversing valve (7) is located at the second station, an oil inlet P of the third reversing valve (7) is communicated with a working oil port B, hydraulic oil can enter a rodless cavity of the lower oil cylinder (3), and a working oil port A of the third reversing valve (7) is in a cut-off state.
5. The hydraulic control system for protecting demolding according to claim 1, wherein the fourth reversing valve (8) is specifically a two-position four-way solenoid valve, and when the fourth reversing valve (8) is located at the first station, an oil inlet P of the fourth reversing valve (8) is communicated with the working oil port B; and when the fourth reversing valve (8) is positioned at the second station, an oil return port T of the fourth reversing valve (8) is communicated with the working oil port B.
6. The hydraulic control system for protecting demoulding according to claim 1, wherein a one-way valve (10) and an overflow valve (11) are arranged between the main oil pump (1) and the first direction-changing valve (5), the second direction-changing valve (6) and the third direction-changing valve (7).
7. Hydraulic control system for protection demoulding according to claim 1, characterized in that the oil circuit between the third change valve (7) and the lower cylinder (3) is provided with a regulating valve (12).
8. The hydraulic control system for protecting stripping according to claim 1, characterized in that the stripping hydraulic pump (4) is a micro pump, and the stripping hydraulic pump (4) is driven by an electric motor (13).
9. The hydraulic control system for protecting mold release according to claim 8, wherein the flow rate of the micro pump is 1-500 ml/min.
10. Powder forming press comprising a protective stripping hydraulic control system, characterized in that the protective stripping hydraulic control system is in particular a protective stripping hydraulic control system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911267491.5A CN111014663B (en) | 2019-12-11 | 2019-12-11 | Powder forming press and protection demoulding hydraulic control system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911267491.5A CN111014663B (en) | 2019-12-11 | 2019-12-11 | Powder forming press and protection demoulding hydraulic control system thereof |
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| CN111014663B (en) | 2022-05-13 |
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Address after: 341000 No. 7, Jinlong Road, Ganzhou economic and Technological Development Zone, Ganzhou City, Jiangxi Province Applicant after: JIANGXI KAIYUAN AUTOMATION EQUIPMENT Co.,Ltd. Address before: 341000 No.7, Jinlong Road, development zone, Zhanggong District, Ganzhou City, Jiangxi Province Applicant before: JIANGXI KAIYUAN AUTOMATION EQUIPMENT Co.,Ltd. |
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