CN112524117A - Special-shaped piston multi-punch oil cylinder device and design method thereof - Google Patents
Special-shaped piston multi-punch oil cylinder device and design method thereof Download PDFInfo
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- CN112524117A CN112524117A CN202011451670.7A CN202011451670A CN112524117A CN 112524117 A CN112524117 A CN 112524117A CN 202011451670 A CN202011451670 A CN 202011451670A CN 112524117 A CN112524117 A CN 112524117A
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1471—Guiding means other than in the end cap
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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
- F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
- F15B2215/30—Constructional details thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Actuator (AREA)
Abstract
The invention provides a special-shaped piston multi-punch oil cylinder device, which comprises: a cylinder body; the piston assembly is arranged inside the cylinder body and comprises a special-shaped piston and a piston rod, and a sealed space formed by the piston assembly and the cylinder body is used for bearing the action of oil pressure; the oil valve switching block is arranged at the bottom of the cylinder body and used for transferring an oil port from the bottom of the cylinder body to the side surface of the cylinder body; the sealing ring is arranged at the bottom of the special-shaped piston; wherein, the hydro-cylinder is used for punching a hole, and the hole is one or more dysmorphism hole. The special-shaped piston multi-punch oil cylinder device provided by the invention has the advantages that the punching quantity is large, the shapes of holes are various, the whole device is simple to install and operate, and the working efficiency is improved.
Description
Technical Field
The invention relates to the technical field of hydraulic forming in-mold punching oil cylinder devices, in particular to a special-shaped piston multi-punch oil cylinder device and a design method thereof.
Background
In the existing hydraulic punching technology, a common punching oil cylinder can only process one in-mold punching hole by a single oil cylinder mechanism, although some oil cylinders can also punch two holes simultaneously, the hole diameters and the shape differences of the holes cannot be too large, the number of the holes cannot exceed three at most, otherwise, poor results such as punching recess, easy breakage of punching needles and the like are easy to occur.
The conventional punching oil cylinder piston structure is circular, and only one piston rod is provided; this structure has the following disadvantages: firstly, the stress centers of the single-piston oil cylinder can only be distributed at the center of the piston rod, and for holes with more than three or more holes, once the hole diameters and the size differences of all the holes are obvious and the distances among the holes are irregular, in-mold punching cannot be realized, because the stress centers of all the punched holes cannot be concentric with the piston rod of the oil cylinder in the state, once the holes are machined, stress deviation occurs, the defects of punching recess, punching needle twist-off, punching insert damage and the like occur, and the piston rod of the oil cylinder can also be twisted and deformed in serious cases, so that the oil cylinder is directly scrapped; secondly, because conventional cylinder piston that punches, piston rod are circular, do not possess the function of preventing changeing, can inevitably appear after long-term action that whole piston assembly takes place to rotate, if dashing the dysmorphism hole, in case the piston rotates will dash the needle and directly twist off from the stiff end.
Moreover, the conventional drilling oil cylinder advance, the oil outlet crossing all is located the side of hydro-cylinder body, and such business turn over hydraulic fluid port processing is although convenient, when advancing the mould with whole drilling oil cylinder device installation, need hollowing out the mould, reserves sufficient space for the oil pipe installation, and the hollowing out on a large scale not only can increase the cost of mould preparation processing like this, also can influence the intensity of whole mould simultaneously, and the hydroforming mould has very high to the intensity requirement. Furthermore, because the oil cylinder is matched with the oil pipe and is sunk into the die, although the relevant position is hollowed, when the oil pipe is installed or replaced, a tool needs to be stretched into a narrow space by hands to remove the screwed joint, so that the operation is difficult, and the workload is larger.
In order to solve the problems, the invention provides a special-shaped piston multi-punch oil cylinder device and a design method thereof, which not only have a large number of punched holes and various shapes of the holes, but also have simple installation and operation of the whole device and improve the working efficiency.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a special-shaped piston multi-punch oil cylinder device and a design method thereof, which are used for solving the technical problems that in the prior art, the number of punched holes of an oil cylinder is single, and the installation operation is complex.
In order to achieve the above and other objects, the present invention provides a multi-punch cylinder device with a special-shaped piston, comprising:
a cylinder body;
the piston assembly is arranged in the cylinder body and comprises a special-shaped piston and a piston rod, and a sealed space formed by the piston assembly and the cylinder body is used for bearing the action of oil pressure;
the oil valve switching block is arranged at the bottom of the cylinder body and used for transferring the oil valve port from the bottom of the cylinder body to the side face of the cylinder body;
the sealing ring is arranged at the bottom of the special-shaped piston;
wherein, the hydro-cylinder is used for punching a hole, and the hole is one or more dysmorphism holes.
In an embodiment of the present invention, the number of the piston rods is determined according to the number of force moment centers of the shaped holes in different areas.
In an embodiment of the present invention, the position of the force moment center of the shaped hole is determined according to the punching force corresponding to the shaped hole and the distance between different shaped holes.
In an embodiment of the present invention, the size and the shape of the special-shaped piston are determined according to a minimum area required by the special-shaped piston and the number of the special-shaped holes in the same area, and the shape of the special-shaped piston includes a circle, an ellipse, a rectangle, a waist and a flower.
In an embodiment of the present invention, the special-shaped piston is connected to the piston rod through a connecting member.
In an embodiment of the present invention, an O-ring is further disposed between the oil valve transition block and the cylinder body to ensure good sealing performance.
In an embodiment of the present invention, the profiled piston multi-punch cylinder device further includes:
the guide sleeve is arranged on the piston rod and plays a role in guiding and supporting the piston rod;
the dustproof ring is arranged on the outer side of the guide sleeve;
and the locking flange is arranged on the outer side of the dust ring.
The invention also provides a design method of the special-shaped piston multi-punch oil cylinder, which comprises the following steps:
calculating the corresponding punching force according to the sizes of different special-shaped holes;
determining stress moment centers corresponding to a plurality of special-shaped holes with similar distances according to the punching force and the distances between different special-shaped holes;
and calculating the size of the related parts of the oil cylinder according to the stress moment center and the punching force of different special-shaped holes so as to determine the number, size and shape of the related parts of the oil cylinder.
In an embodiment of the present invention, the step of calculating the size of the related parts of the cylinder according to the force moment center and the punching force of the different shaped holes to determine the number, size and shape of the related parts of the cylinder includes:
determining the number of the piston rods according to the number of the stress moment centers;
calculating to obtain the minimum area required by the special-shaped piston according to the punching force of different special-shaped holes;
and determining the size and the shape of the special-shaped piston according to the number of the special-shaped holes in the same area based on the minimum area required by the special-shaped piston.
In an embodiment of the present invention, calculating the dimensions of the components related to the oil cylinder further includes: and calculating the length of the oil cylinder to determine the specification size of the sealing ring.
As described above, the multi-punch cylinder device with the special-shaped piston and the design method thereof provided by the invention have the following effects: the punching quantity is more, the multi-hole processing is more stable, and the efficiency is higher; the shape and size of all holes need not be uniform and can be any shape; the oil cylinder has an anti-rotation function, an anti-rotation mechanism does not need to be additionally arranged, and the structure is simple; and the device is simple to install and operate, and the die holder does not need to be hollowed out in a large range for piping.
Drawings
Fig. 1 shows a schematic structural diagram of a multi-punch cylinder device with a special-shaped piston according to the present invention.
FIG. 2 is a schematic diagram illustrating the processing of a punch hole in a hydraulic film according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an oil feeding and discharging passage according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a piston assembly according to an embodiment of the present invention.
FIG. 5 is a schematic view showing the location of the moment center of the inner hole in different areas according to an embodiment of the present invention.
Fig. 6-9 show schematic structural diagrams of the profiled piston in the embodiment of the invention.
FIG. 10 is a schematic diagram of a multi-hole in-mold punch assembly according to an embodiment of the present invention.
Fig. 11 is a schematic structural diagram of the profiled piston multi-punch oil cylinder device in a die.
Fig. 12 shows a schematic flow chart of a method for designing a multi-punch cylinder with a special-shaped piston according to the present invention.
Fig. 13 is a flowchart illustrating step S3 according to an embodiment of the present invention.
Description of the symbols
1 cylinder body 7a guide sleeve 1
2 piston assembly 7b guide sleeve II
21 special-shaped piston 8 dustproof ring
22 piston rod 9 circular sealing ring
3 the fuel tap changes over the locking flange of 10 of the block
4 sealing ring 11 a-11 f punching needle group
5a area one 12 punching needle fixing component
5b area two 13 punching needle switching block
Three 14 oil cylinders in 5c area
6O-shaped sealing ring 15 oil pipe assembly
7 guide sleeve and 16 oil pipe assembly II
S1-S3 Steps S31-S33S 3 steps
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
As shown in fig. 1-2, a profiled piston multi-punch cylinder device includes: the oil valve comprises a cylinder body 1, a piston assembly 2, an oil valve transfer block 3 and a sealing ring 4; the piston assembly 2 is arranged inside the oil cylinder body 1, a sealing space formed by the piston assembly 2 and the cylinder body 1 is used for bearing the oil pressure, the oil valve transfer block 3 is arranged at the bottom of the cylinder body 1, the oil valve transfer block 3 is used for transferring an oil port from the bottom of the cylinder body 1 to the side face of the cylinder body 1, and the sealing ring 4 is arranged at the bottom of the piston assembly 2 and used for ensuring the sealing performance of the oil cylinder device. In an embodiment of the invention, the inner punching of the hydraulic film adopts an outer-to-inner punching mode, when the punching operation is carried out, hydraulic oil enters from an oil inlet, when the hydraulic oil is gradually filled on one side of the cylinder body 1, the piston assembly 2 is pushed upwards by the oil pressure, so that the punching needle is pushed upwards to realize the punching, when the hydraulic oil is gradually withdrawn from an oil outlet, the piston assembly 2 is pushed downwards by the oil pressure, so that the punching needle is withdrawn from the punching, and the piston assembly 2 repeatedly carries out the reciprocating motion according to the process to realize the punching operation.
As shown in fig. 3, in an embodiment of the present invention, an oil inlet and an oil outlet of an oil cylinder are arranged at the bottom of a cylinder body 1 of the oil cylinder, and an oil valve adapter block 3 is arranged at the bottom of the cylinder body 1 for transferring an oil passage port to the side surface of the cylinder body 1; because the related position needs to be hollowed when the whole oil cylinder device is installed in the die, the purpose is to reserve enough space for installing the oil pipe, but such large-scale hollowing not only increases the manufacturing cost of the die, but also affects the strength of the whole die, in addition, because the oil cylinder is matched with the oil pipe and is sunk into the bottom of the die, although the related position is hollowed, when the oil pipe is installed or replaced, a tool needs to be stretched into a narrow space, and then the joint of the oil pipe is dismantled, so the operation difficulty and the workload are large, in the embodiment, the oil way port is arranged at the bottom of the cylinder body 1, and the oil valve switching block 3 is arranged to transfer the oil way port to the side surface of the cylinder body 1, so that when the whole oil cylinder device is installed in the die, the die does not need to be hollowed any more, the strength of the die is ensured, and the manufacturing cost of the die is saved, the operation is also more convenient when later stage is changed the hydro-cylinder. In an embodiment of the present invention, an O-ring 6 is further disposed between the oil valve transition block 3 and the cylinder 1 to ensure good sealing performance.
As shown in fig. 4, further, the piston assembly 2 further includes: a special-shaped piston 21 and a piston rod 22; wherein, the piston rod 22 is arranged in the cylinder 1, the special-shaped piston 21 is arranged at one end of the piston rod 22, and the other end of the piston rod 22 can enter and exit the cylinder 1 along with the pushing of the special-shaped piston 21. In an embodiment of the present invention, a sealing ring 4 is further provided on the shaped piston 21 to ensure the sealing performance of the device, for example, a rectangular sealing ring is selected. The shaped piston 21 is connected to the piston rod 22 by means of a connecting element, such as a screw. The range of motion of the profiled piston 21 is limited by the length of the cylinder 1, and the sealing ring 4 on the profiled piston 21 divides the cylinder 1 into two chambers: the special-shaped piston 21 is pushed under the action of oil pressure when the rodless cavity is filled with hydraulic oil, so that the piston rod 22 is driven to extend out of the cylinder body 1, and the special-shaped piston 21 is pushed back when the rodless cavity is filled with the hydraulic oil, so that the piston rod 22 is driven to retract.
As shown in fig. 5, in an embodiment of the present invention, the cylinder device can perform multi-punch punching, that is, a plurality of piston rods 22 can be disposed in the cylinder, and the number of the piston rods 22 is determined according to the number of force moment centers of the shaped holes in different areas, and the position of the force moment center of the shaped hole is determined according to the punching force corresponding to the shaped hole and the distance between the shaped holes. When two holes are arranged in areas with similar distances, firstly measuring the distances between the two holes, and then dividing the distances equally according to the punching force of the two holes in proportion to obtain the stress moment centers of the two holes; when three holes are arranged in areas with similar distances, dividing the three holes into three groups in pairs, sequentially obtaining three moment centers according to the method for taking the centers of the two holes, and fitting the three moment centers into a circle, wherein the circle center of the circle is the moment center of the three holes; when four holes are arranged in the areas with similar distances, taking three holes, obtaining a moment center by adopting the three-hole centering method, enabling the moment center to be equivalent to one hole, and obtaining the moment center by using a two-hole proportion method with the rest one hole, wherein the moment center is the moment center of the four holes. By analogy, no matter how many holes are in the adjacent region, the moment centers of the holes in the region can be obtained by comprehensively using the two-hole and three-hole methods, and the number of the piston rods 22 can be determined according to the number of the stressed moment centers in different regions. For example, if there are three force moment centers in the first region 5a, three piston rods 22 may be provided, if there is one force moment center in the second region 5b, one piston rod 22 may be provided, and if there are two force moment centers in the third region 5c, two piston rods 22 may be provided.
As shown in fig. 6 to 9, in an embodiment of the present invention, the size and shape of the shaped piston 21 are determined according to the minimum area required by the shaped piston 21 and the number of shaped holes in the same area. First, the minimum area required for the profiled piston 21 is calculated: calculating to obtain the minimum area required by the special-shaped piston 21 according to the cross section area of the piston rod 22, the force required during punching and the pressure provided by the oil pressure during punching; when the minimum area required by the special-shaped piston 21 is obtained, the size of the special-shaped piston 21 cannot be smaller than the minimum area, so that the special-shaped piston 21 can cover the moment center. Secondly, on the premise of not being smaller than the minimum area, the shape of the special-shaped piston 21 is determined according to the number of the special-shaped holes in the same area, for example, if the number of the special-shaped holes in the same area is two, the oval-shaped special-shaped piston 21 can be selected, and if the number of the special-shaped holes in the same area is five, the flower-shaped special-shaped piston 21 can be selected. The piston is designed to be special-shaped, the defect of dispersed punching force of the traditional round single piston is well overcome, and then the special-shaped piston 21 structure has an anti-rotation effect and does not need to be additionally provided with an anti-rotation mechanism.
As shown in fig. 1, the multi-punch cylinder device with the special-shaped piston further comprises: the device comprises a guide sleeve 7, a dustproof ring 8, a circular sealing ring 9 and a locking flange 10; the guide sleeve 7 is arranged on the piston rod 22, the guide sleeve 7 plays a role in guiding and supporting the piston rod 22, the dust ring 8 is arranged on the outer side of the guide sleeve 7, the circular sealing ring 9 is arranged on the outer side of the dust ring 8, and the locking flange 10 is arranged on the outer side of the circular sealing ring 9 and used for fixing the oil cylinder device.
As shown in fig. 10, in an embodiment of the present invention, the oil cylinder device and the punching pin including six different punching holes are assembled together through a switching assembly, and the assembled structure mainly includes: the oil valve switching block 3, the punching needle group 11, the punching needle fixing component 12, the punching needle switching block 13 and the oil cylinder 14; the oil valve transfer block 3 is arranged at the bottom of the oil cylinder 14, an oil inlet and outlet port is formed in the oil valve transfer block 3, the oil valve transfer block 3 is used for transferring an oil way port to the side face of the oil cylinder 14, the punching needle transfer block 13 is arranged on the oil cylinder 14, the punching needle group 11 is arranged on the punching needle transfer block 13, and the punching needle group is fixed on the punching needle transfer block 13 through the punching needle fixing assembly 12. When needing to punch a hole, the hydro-cylinder begins the operation, hydraulic oil gets into from hydro-cylinder 14 bottom, oil valve switching piece 3 shifts the hydraulic oil that gets into to hydro-cylinder 14 side, when hydraulic oil is full of hydro-cylinder 14 cylinder body 1 one side gradually, the piston assembly 2 of oil pressure in with cylinder body 1 upwards promotes, thereby it realizes punching a hole to promote drift group 11 upward movement, when hydraulic oil withdraws from the oil circuit mouth gradually, the oil pressure promotes piston assembly 2 downwards again, thereby make drift group 11 withdraw from punching a hole, do reciprocating motion many times with this process is relapse, realize punching a plurality of holes simultaneously, just the hole is the dysmorphism hole.
As shown in fig. 11, in an embodiment of the present invention, the profiled piston multi-punch cylinder device is installed in a die, and the assembled structure mainly includes: the oil valve switching block 3, the punching needle group 11, the punching needle switching block 13, the oil cylinder 14, the first oil pipe assembly 15 and the second oil pipe assembly 16; the oil valve switching block 3 is arranged at the bottom of the oil cylinder 14 and used for transferring an oil way port to the side face of the oil cylinder 14, the oil pipe assembly I15 is arranged on a lower template of the die, the oil pipe assembly II 16 is arranged on one side of a lower die of the die, the punching needle switching block 13 is arranged on the oil cylinder 14, and the punching needle group 11 is arranged on the punching needle switching block 13 and used for realizing punching. When punching a hole in the mould, install hydro-cylinder 14 in the mould, because be equipped with the oil valve switching piece 3 on the hydro-cylinder 14, so when installing the device, need not to undercut the mould bottom in order to install oil pipe subassembly one 15 and oil pipe subassembly two 16, later rethread punch a hole simultaneously through punch needle group 11 realization a plurality of dysmorphism holes, both guaranteed the intensity of mould like this, also be convenient for later stage maintenance change the hydro-cylinder 14, improved work efficiency.
As shown in fig. 12, the invention further provides a method for designing the special-shaped piston multi-punch oil cylinder, which comprises the following steps:
s1, calculating the corresponding punching force according to the sizes of different special-shaped holes;
s2, determining stress moment centers of the irregular holes with similar distances according to the punching force and the distances among the different irregular holes;
and S3, calculating the sizes of the related parts of the oil cylinder according to the stress moment center and the punching force of different special-shaped holes so as to determine the number, size and shape of the related parts of the oil cylinder.
In an embodiment of the present invention, for step S1, the punching force corresponding to the special-shaped hole is calculated according to formula (1):
F＝ηCtk+p1S (1)
wherein F is punching force; eta is coefficient, generally 0.65-0.8; t is the thickness of the tube wall in mm; k is the shear strength of the material, and the unit is MPa; p is a radical of1Forming pressure, in MPa; c is the perimeter of the special-shaped hole; and S is the area of the special-shaped hole. For example, when the hole is circular and has a diameter d1At the time, the punching force of the circular hole is
When the special-shaped hole is hexagonal and the side length is a, the punching force corresponding to the hexagonal hole is
In one embodiment of the present invention, for step S2, when there are two holes in the areas with similar distances, the distance between the two holes is first measured, and then the distance is proportionally divided according to formula (2) to obtain the moment center:
wherein, F1A punching force for the first hole; f2A punching force for the second hole; l is the distance between the two wells; l1The distance between the stress moment centers of the two holes and the length of the first hole is determined.
When three holes are arranged in areas with similar distances, the three holes are divided into three groups in pairs, three moment centers are obtained according to the two-hole proportion method, and then the three moment centers are fitted into a circle, so that the circle center of the circle is the moment center of the three holes; when four holes are arranged in the areas with similar distances, taking three holes, obtaining a moment center by adopting the three-hole centering method, enabling the moment center to be equivalent to one hole, and obtaining the moment center by using a two-hole proportion method with the rest one hole, wherein the center is the moment center of the four holes. By analogy, no matter how many holes are in the adjacent region, the moment centers of the holes in the region can be obtained by comprehensively using the two-hole and three-hole methods.
As shown in fig. 13, further, step S3 includes:
s31, determining the number of the piston rods according to the number of the stress moment centers;
s32, calculating the minimum area required by the special-shaped piston according to the punching force of different special-shaped holes;
and S33, determining the size and the shape of the special-shaped piston according to the number of the special-shaped holes in the same area based on the minimum area required by the special-shaped piston.
In an embodiment of the present invention, for step S31, the force moment centers of the multiple holes in different regions are obtained from step S2, and the number of the piston rods is determined according to the number of the force moment centers, for example, if there are three force moment centers in region one, three piston rods may be correspondingly disposed, if there is one force moment center in region two, one piston rod may be correspondingly disposed, and if there are two force moment centers in region three, two piston rods may be correspondingly disposed.
In one embodiment of the present invention, for step S32, the minimum area required for the shaped piston is calculated according to equation (3):
wherein F is punching force; s is the cross-sectional area of the piston rod; p is a radical of2The pressure is provided for oil pressure during punching; and A is the minimum area required by the special-shaped piston. For example, when the piston rod is circular in cross-section and has a diameter d2The minimum area required by the special-shaped piston is
When the cross section of the piston rod is rectangular, and the length of the piston rod is a and the width of the piston rod is b, the minimum area required by the special-shaped piston is
In an embodiment of the invention, for step S33, after the minimum area required by the shaped piston is obtained through step S32, the size of the shaped piston cannot be smaller than the minimum area, so as to ensure that the shaped piston can cover the moment center; secondly, on the premise of not being smaller than the minimum area, the shape of the special-shaped piston is determined according to the number of the special-shaped holes in the same area, for example, if the number of the special-shaped holes in the same area is two, the oval-shaped special-shaped piston can be selected, and if the number of the special-shaped holes in the same area is five, the flower-shaped special-shaped piston can be selected.
In an embodiment of the invention, the specification and size of the sealing ring can be determined according to the length of the oil cylinder. Further, the length of the oil cylinder can be calculated according to the formula (4):
L＝S+h1+h2+h3+l2+l3
wherein S is the stroke of the piston; h is1Is the width of the piston; h is2The width of the sealing section at the upper end of the piston rod; h is3The thickness of the bottom end of the oil cylinder; l2The maximum length of the piston rod guided in the oil cylinder; l3The length of the locking flange at the upper end of the oil cylinder is adopted.
In conclusion, the invention provides the special-shaped piston multi-punch oil cylinder device and the design method thereof, the punching quantity is large, the multi-hole processing is more stable, and the efficiency is higher; the shape and size of all holes need not be uniform and can be any shape; the oil cylinder has an anti-rotation function, an anti-rotation mechanism does not need to be additionally arranged, and the structure is simple; and the device is simple to install and operate, and the die holder does not need to be hollowed out in a large range for piping. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above description is only a preferred embodiment of the present application and a description of the applied technical principle, and it should be understood by those skilled in the art that the scope of the present invention related to the present application is not limited to the technical solution of the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept, for example, the technical solutions formed by mutually replacing the above features with (but not limited to) technical features having similar functions disclosed in the present application.
Other technical features than those described in the specification are known to those skilled in the art, and are not described herein in detail in order to highlight the innovative features of the present invention.
Claims (10)
1. The utility model provides a many drifts of dysmorphism piston hydro-cylinder device which characterized in that includes:
a cylinder body;
the piston assembly is arranged inside the cylinder body and comprises a special-shaped piston and a piston rod, and a sealed space formed by the piston assembly and the cylinder body is used for bearing the action of oil pressure;
the oil valve switching block is arranged at the bottom of the cylinder body and used for transferring an oil port from the bottom of the cylinder body to the side surface of the cylinder body;
the sealing ring is arranged at the bottom of the special-shaped piston;
wherein, the hydro-cylinder is used for punching a hole, and the hole is one or more dysmorphism hole.
2. The multi-punch cylinder device with the special-shaped piston as claimed in claim 1, wherein: the number of the piston rods is determined according to the number of force moment centers of the special-shaped holes in different areas.
3. The multi-punch cylinder device with the special-shaped piston as claimed in claim 2, wherein: the position of the stress moment center of the special-shaped hole is determined according to the punching force corresponding to the special-shaped hole and the distance between different special-shaped holes.
4. The multi-punch cylinder device with the special-shaped piston as claimed in claim 1, wherein: the size and the shape of the special-shaped piston are determined according to the minimum area required by the special-shaped piston and the number of the special-shaped holes in the same area, and the shape of the special-shaped piston comprises a circle, an ellipse, a rectangle, a waist and a flower.
5. The multi-punch cylinder device with the special-shaped piston as claimed in claim 1, wherein: the special-shaped piston is connected with the piston rod through a connecting piece.
6. The multi-punch cylinder device with the special-shaped piston as claimed in claim 1, wherein: an O-shaped sealing ring is further arranged between the oil valve adapter block and the cylinder body to ensure good sealing performance.
7. The profiled piston multi-ram cylinder apparatus of claim 1, further comprising:
the guide sleeve is arranged on the piston rod and plays a role in guiding and supporting the piston rod;
the dustproof ring is arranged on the outer side of the guide sleeve;
and the locking flange is arranged on the outer side of the dust ring.
8. A method for designing a special-shaped piston multi-punch oil cylinder is characterized by comprising the following steps:
calculating the corresponding punching force according to the sizes of different special-shaped holes;
determining stress moment centers corresponding to a plurality of the special-shaped holes with similar distances according to the punching force and the distances among different special-shaped holes;
and calculating the size of the related parts of the oil cylinder according to the stress moment center and the punching force of different special-shaped holes so as to determine the number, size and shape of the related parts of the oil cylinder.
9. The method for designing the multi-punch oil cylinder with the special-shaped piston as claimed in claim 8, wherein the step of calculating the size of the relevant parts of the oil cylinder according to the stress moment center and the punching force of different special-shaped holes to determine the number, size and shape of the relevant parts of the oil cylinder comprises the following steps:
determining the number of the piston rods according to the number of the stress moment centers;
calculating to obtain the minimum area required by the special-shaped piston according to the punching force of different special-shaped holes;
and determining the size and the shape of the special-shaped piston according to the number of the special-shaped holes in the same area based on the minimum area required by the special-shaped piston.
10. The method of claim 8, wherein calculating the dimensions of the associated components of the cylinder further comprises: and calculating the length of the oil cylinder to determine the specification size of the sealing ring.
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| CN112524117B (en) | 2023-08-08 |
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