CN117102907B - High-precision flexible composite liquid expansion tool clamp for thin-wall workpiece - Google Patents
High-precision flexible composite liquid expansion tool clamp for thin-wall workpiece Download PDFInfo
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- CN117102907B CN117102907B CN202311377173.0A CN202311377173A CN117102907B CN 117102907 B CN117102907 B CN 117102907B CN 202311377173 A CN202311377173 A CN 202311377173A CN 117102907 B CN117102907 B CN 117102907B
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- 239000007788 liquid Substances 0.000 title claims abstract description 54
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 238000013461 design Methods 0.000 claims description 26
- 238000007789 sealing Methods 0.000 claims description 11
- 238000011166 aliquoting Methods 0.000 claims description 10
- 230000007704 transition Effects 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000003825 pressing Methods 0.000 abstract description 7
- 238000004458 analytical method Methods 0.000 description 9
- 239000002184 metal Substances 0.000 description 8
- 238000009434 installation Methods 0.000 description 5
- 239000010720 hydraulic oil Substances 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/40—Expansion mandrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
- B23Q3/065—Work-clamping means adapted for holding workpieces having a special form or being made from a special material for holding workpieces being specially deformable, e.g. made from thin-walled or elastic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/08—Work-clamping means other than mechanically-actuated
- B23Q3/082—Work-clamping means other than mechanically-actuated hydraulically actuated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
Abstract
The invention discloses a high-precision flexible composite liquid expansion fixture for a thin-wall workpiece, and belongs to the technical field of precision fixtures. The tool clamp comprises a liquid expansion body arranged on a base, wherein the liquid expansion body comprises an upper mounting part, a tool part and a lower mounting part, a first hydraulic channel is formed in the center of the top of the liquid expansion body downwards, a hydraulic driving device is arranged on the center of the top of the liquid expansion body, a first annular hydraulic cavity is formed in the inner circumference of the outer wall of the tool part and communicated with the first hydraulic channel, a workpiece clamping part is arranged on the outer circumference of part of the tool part, a plurality of equally-divided helical teeth are circumferentially arranged on the workpiece clamping part, a clamping part is circumferentially arranged at the bottom end of the workpiece inwards, a tooth-shaped contact surface of the equally-divided helical teeth is in contact with the inner wall of the workpiece, and the tooth-shaped contact surface of the equally-divided helical teeth is axially overlapped on the extending end of the clamping part. The force of the tooling pressing part is unloaded and converted by arranging the equal-dividing helical teeth, and the converted force is reduced so as to meet the requirement that the thin-wall part can effectively resist the pressing load when being precisely fixed, thereby not causing deformation.
Description
Technical Field
The invention relates to the technical field of precision clamps, in particular to a high-precision flexible composite liquid expansion fixture for a thin-wall workpiece.
Background
In the current mechanical engineering process, the connection in the current mechanical transmission is generally to transmit motion through key connection, and the key connection mode is adopted, so that the key groove is required to be processed on the shaft and the hub, the strength of a workpiece is reduced, and the bearing capacity is limited by the shearing and extrusion strength of the key. Because of the axial positioning difference of the key connection, the shaft hole fit is often an interference fit, heating is needed during installation, a professional puller is needed during disassembly, and even destructive disassembly is needed. Mechanical expansion sleeve connection has occurred earlier, the mechanical expansion sleeve is keyless connection, although the defect of the keyed connection can be overcome, the mechanical expansion sleeve has a plurality of defects: the mechanical expansion sleeve is composed of at least two parts, and some parts are even five parts, so that the machining and the manufacturing are very complex; the installation of the mechanical expansion sleeve requires tightening a plurality of high-strength bolts, and the installation is time-consuming and labor-consuming; when the mechanical expansion sleeve is installed, relative movement exists between conical surfaces of the expansion sleeve, between the expansion sleeve and the shaft and between the expansion sleeve and the hub, if the mechanical expansion sleeve is not cleaned up during installation, grinding damage can be generated between contact surfaces, so that the mechanical expansion sleeve is very difficult to disassemble, and the mechanical expansion sleeve cannot be disassembled when serious; the wall thickness of the mechanical expansion sleeve is uneven, and after the bolt is screwed, stress concentration can be generated at the edge of the thinner end, so that the shaft can be cracked or even broken; when the expansion sleeve is installed, rust-proof oil needs to be smeared, otherwise, the expansion sleeve cannot be disassembled after being rusted. Therefore, a hydraulic expansion sleeve is generated, and the hydraulic expansion sleeve mainly comprises an expansion sleeve main body, a pressure regulating screw, a piston, a sealing ball, a sealing screw and a hydraulic medium. The expansion sleeve main body has a complex structure and is composed of a flange end and an inner cylinder and an outer cylinder, the two cylinders enclose a hydraulic cavity for storing hydraulic medium and are communicated with a piston cavity in the flange end, and pressure regulating screws and pistons are arranged in the flange to play a role in changing and maintaining the hydrostatic pressure in the annular interlayer.
When the thin-wall workpiece is fixed, the existing tool can have an acting force to press the contact surface of the part, and the thin-wall part can follow deformation under the pressing load, so that the high-precision requirement is affected. When the metal expansion wall of the hydraulic expansion tool is subjected to the pressure of hydraulic oil, the metal expansion wall can be expanded outwards to be in contact with the part, and a certain contact pressure is generated. When the pressure of the hydraulic oil is constant, the metal expansion wall of the hydraulic expansion tool becomes large, and the diameter of the contact surface becomes constant. When the aperture of the installed part is smaller, the contact pressure of the contact surface becomes larger, and the thin-wall workpiece is caused to follow deformation. If the corresponding hydraulic oil pressure is adjusted according to the actual size of the aperture of the part, the diameter of the contact surface is increased to correspondingly change along with the aperture of the part, the mode causes more complex conditions of considered factors, and the efficiency of workpiece installation is affected.
Disclosure of Invention
The invention aims to provide a high-precision flexible composite liquid expansion tool clamp for a thin-wall workpiece, which is characterized in that the force of pressing a part by a tool is unloaded and converted through flexible design, and the converted force is reduced so as to meet the requirement that the thin-wall part can effectively resist the pressing load during precision fixing, so that deformation is not caused.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the high-precision flexible composite liquid expansion fixture for the thin-wall workpiece comprises a liquid expansion body arranged on a base, wherein the liquid expansion body comprises an upper mounting part, a fixture part and a lower mounting part, a first hydraulic channel is formed in the middle of the top of the liquid expansion body downwards and is provided with a hydraulic driving device, a first annular hydraulic cavity is formed in the outer wall of the fixture part in the inner circumferential direction, the first annular hydraulic cavity is communicated with the first hydraulic channel, a workpiece clamping part is formed in the outer circumference of a part of the fixture part, a plurality of equally-divided helical teeth are circumferentially arranged on the workpiece clamping part, a clamping part is circumferentially arranged in the bottom end of the workpiece, tooth-shaped contact surfaces of the equally-divided helical teeth are in contact with the inner wall of the workpiece, the tooth-shaped contact surfaces are axially lapped on the extending end of the clamping part, and the lower mounting part of the liquid expansion body is in matched connection with the inner wall of the base;
the aliquoting helical gear is provided with a gear end and a gear root, the shrinkage of the bent gear end of the gear root of the single aliquoting helical gear occurs after the design pressure is received, the design pressure is set as P, and the shrinkage of the gear end is set asThe relationship between the inclination angle theta of the equal-dividing helical teeth and the tooth end shrinkage and the tooth length of each tooth is determined to satisfy the following formula:
wherein W is set as the thickness of each tooth root of each aliquoting tooth, and the unit is mm; n is the number of teeth divided equally,the tooth end shrinkage is in mm; l (L) 1 Is a single sheetThe tooth length of each tooth is in mm; />、/>、/>、/>Are all constant and take the values of-204.6, -6.489, 1583.461 and 2.066 respectively.
As the preferable technical scheme of the invention, the hydraulic driving device comprises a spanner, a fastener, a piston and a sealing element which are sequentially connected, wherein the fastener is in threaded fit with the inner wall of the liquid expansion body at the first hydraulic channel, the piston and the sealing element are positioned in the first hydraulic channel and are in sliding fit with the first hydraulic channel, and the first hydraulic channel is communicated with the first annular hydraulic cavity.
As the preferable technical scheme of the invention, the bottom of the lower mounting part of the liquid expansion body is provided with a second hydraulic channel upwards, a sealing piece is arranged in the second hydraulic channel, the outer wall of the lower mounting part is provided with a second annular hydraulic cavity inwards and circumferentially, the second annular hydraulic cavity is communicated with the second hydraulic channel, and the second hydraulic channel is communicated with the first hydraulic channel.
Further preferably, the width of the second annular hydraulic chamber is smaller than the width of the first annular hydraulic chamber.
Further preferably, the diameter of the second hydraulic passage is smaller than the diameter of the first hydraulic passage.
As the preferable technical scheme of the invention, the hydraulic expansion body further comprises a lifting lug, wherein the periphery of the upper mounting part of the hydraulic expansion body is provided with a symmetrical tangential plane, the tangential plane and the top surface of the tool part form a mounting position of the lifting lug, and the lifting lug is in threaded fit with the tool part through an external thread piece.
Further preferably, the position of the lifting lug facing the upper mounting part of the liquid expansion body is provided with a bevel, the upper part of the upper mounting part of the liquid expansion body is conical, and the bevel forms a V shape relative to the conical shape.
As the preferable technical scheme of the invention, the base is of a bowl-shaped structure with an upward opening, the inside of the base comprises an inclined transition surface and a vertical through hole, the bottom surface of the tool part of the liquid expansion body is lapped on the inclined transition surface, and the lower part of the liquid expansion body stretches into the vertical through hole to be connected in a matching way.
Further preferably, a boss is inwardly arranged on the opening end face of the base, the side face of the boss is in contact with the extending end of the clamping portion, the top face of the boss is in contact with the workpiece clamping portion, and the bottom face of the clamping portion of the workpiece is in contact with the top face of the opening end of the base and is stopped at the boss.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) A part of entity is reserved on the outer circle of the original tooling, namely, part of the outer circle of the tooling part of the liquid expansion body is circumferentially designed into a shape characteristic of helical teeth with equal quantity, after the helical tooth length, the equal tooth number and the tooth root thickness are locked, the inclination angle of the equal helical tooth and the tooth end shrinkage are correlated, a given formula is given, and when the outer circle surface is set to be subjected to design pressure, the synchronous shrinkage of all helical teeth can be ensured to be in the range of design requirements;
(2) When the pressure of hydraulic oil is constant, the diameter of the tooth-shaped contact surface is also constant; however, when the aperture of the installed part is smaller, the contact pressure of the contact surface is increased, so that the circle of equally-divided helical teeth designed by the invention plays a role in flexible buffering on the workpiece, and when the workpiece with small aperture is installed, the tooth root end of the tooth can be bent and retracted because the stress reaches the threshold value required by the design, so that the invention is applicable no matter the aperture of the workpiece is large or small, and no other adjustment is needed.
(3) Before the invention is developed, the thin-wall workpiece is deformed after being subjected to certain internal supporting force according to calculation and analysis, the inclination of the inclined teeth on the surface after deformation is changed, so that the measured inclination angle value is not an accurate true value, because the liquid expansion is the rigid expansion of the metal thin-wall and requires quite large pressure to expand by a certain amount, the principle is that the liquid expansion is high in precision, in order to accommodate the tolerance range of the workpiece, the force causing the expansion is required to be set at the upper tolerance of the aperture of the workpiece, when the workpiece with equal lower tolerance is installed, redundant pressure is conducted to the workpiece, the workpiece starts to elastically deform due to the fact that the thin-wall workpiece is difficult to resist.
Drawings
FIG. 1 is a cross-sectional view of a hydraulic expansion tooling fixture of the present invention;
FIG. 2 is a cross-sectional view B-B of FIG. 1;
FIG. 3 is an enlarged view of part of A of FIG. 1;
FIG. 4 is an exploded perspective view of one embodiment of the present invention;
FIG. 5 is a simulated analysis of deformation of a workpiece helical tooth as the workpiece is pressed;
FIG. 6 is a graph of a simulated analysis of an aliquoting helical tooth when subjected to hydraulic expansion alone;
FIG. 7 is a graph of a simulated analysis of the outer circumference of a tooth equally dividing helical teeth when compressed;
FIG. 8 is a schematic view of a liquid expansion body with equally dividing helical teeth;
in the figure, 1-workpiece, 2-base, 20-boss, 21-inclined transition surface, 3-closure, 4-liquid expansion body, 40-metal expansion wall, 41-first annular hydraulic cavity, 42-second annular hydraulic cavity, 5-workpiece clamping part, 50-tooth end, 51-tooth root, 6-lifting lug, 60-inclined surface, 7-hydraulic driving device, 70-first hydraulic channel, 71-spanner, 72-fastener, 73-piston, 74-sealing piece and 8-second hydraulic channel.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As can be seen from fig. 1-3, the high-precision flexible composite hydraulic expansion fixture for the thin-wall workpiece 1 comprises a hydraulic expansion body 4 arranged on a base 2, wherein the hydraulic expansion body 4 comprises an upper mounting part, a fixture part and a lower mounting part, a first hydraulic channel 70 is arranged in the middle of the top of the hydraulic expansion body 4 downwards and is provided with a hydraulic driving device 7, a first annular hydraulic cavity 41 is arranged on the outer wall of the fixture part inwards and circumferentially, the first annular hydraulic cavity 41 is communicated with the first hydraulic channel 70, a workpiece clamping part 5 is arranged on the outer circumference of part of the fixture part, a plurality of equally-divided helical teeth are circumferentially arranged on the workpiece clamping part 5, the bottom end of the workpiece 1 is internally and circumferentially provided with a clamping part, the tooth end 50 contact surface of the equally-divided helical teeth is contacted with the inner wall of the workpiece 1, the tooth end is axially lapped on the extending end of the clamping part, and the lower mounting part of the hydraulic expansion body 4 is in matched connection with the inner wall of the base 2;
referring to fig. 8, the aliquoting helical tooth has a tooth tip 50 and a tooth root 51, and the shrinkage of the curved tooth tip 50 of the tooth root 51 of the single aliquoting helical tooth occurs after receiving the design pressure, the design pressure is set to be P, and the shrinkage of the tooth tip is set to beThe relationship between the inclination angle theta of the equal-dividing helical teeth and the tooth end shrinkage and the tooth length of each tooth is determined to satisfy the following formula:
wherein W is set as the thickness of each tooth root of each aliquoting tooth, and the unit is mm; n is the number of teeth divided equally,the tooth end shrinkage is in mm; l (L) 1 Tooth length is the unit of mm for a single tooth; />、/>、/>、/>Are all constant and take the values of-204.6, -6.489, 1583.461 and 2.066 respectively.
Referring to fig. 5, finite element analysis is performed on a thin-walled workpiece 1 in the drawing, in which a simulation analysis diagram of deformation of the helical teeth of the workpiece 1 is designed without halving helical teeth, and for this problem, the application introduces halving helical teeth flexible design, and referring to fig. 6 and 7, all tooth synchronous shrinkage design requirements of halving helical teeth in the embodiment are obtained according to simulation analysis results of the workpiece 1: when the equally divided helical teeth receive a contact area pressure of 1.5 MPa, the deformation of the workpiece 1 is within 0.001mm, and the workpiece belongs to the allowable range, namely the design requirement, and when the tolerance range of the aperture of the workpiece 1 is 0.1mm, the design pressure received by the tooth shape of the equally divided helical teeth is 1.2MPa, and the tooth end is contracted by 0.05mm.
Combining the current workpiece processing level and experience, and for a thin-wall workpiece with common diameter specification of 90-100 mm, equally dividing the value of the tooth number N to be 32; for the helical teeth with common tooth length specification of 15-25mm, the tooth root thickness W is 2.94mm, the design pressure P is set to be 1.0-1.2 MPa in combination with the design requirement, and the related data are obtained after finite element analysis is carried out on the thin-wall workpiece 1, wherein the data are shown in the following table:
fitting according to the table values to obtain a formulaWherein the constant->、/>、/>、/>The values are respectively-204.6, -6.489, 1583.461 and 2.066. It can be seen that for the thin-wall workpiece with the specification of 90-100 mm, when the inclination angle of the equally divided helical teeth is 50 degrees, the shrinkage of the tooth end is 0.047, so that the design requirement that the design pressure P is 0.05mm after 1.2MPa, and the design requirements are also met by 45 degrees and 40 degrees. Therefore, the inclination angle design of the equally-divided helical teeth is related to the tooth end shrinkage, the tooth root thickness and the tooth length, the design pressure is set for thin-wall workpieces with different specifications, the design requirement of the tooth end shrinkage under the design pressure is met, the data of the tooth end shrinkage, the tooth root thickness and the tooth length can be obtained, the flexible helical tooth design with the inclination angle is introduced, when the workpiece with small aperture is installed, the tooth end of the tooth root can be bent and retracted because the stress reaches the threshold value of the design requirement, and the method is applicable no matter whether the aperture of the workpiece is large or small, and does not need any other adjustment. The force of the tooling for pressing the part is unloaded and converted, and the converted force is reduced so as to meet the requirement that the thin-wall part can effectively resist the pressing load when being precisely fixed, thereby not causing deformation.
Referring to fig. 1, the hydraulic driving device 7 includes a wrench 71, a fastener 72, a piston 73 and a sealing member 74 connected in sequence, the fastener 72 is in threaded engagement with the inner wall of the liquid expansion body 4 at the first hydraulic passage 70, the piston 73 is located in the first hydraulic passage 70 and is in sliding engagement with the first hydraulic passage 70, and the first hydraulic passage 70 is in communication with the first annular hydraulic chamber 41.
Referring to fig. 1, a second hydraulic channel 8 is upwardly opened at the bottom of the lower part of the liquid expansion body 4, a sealing piece 3 is arranged in the second hydraulic channel 8, a second annular hydraulic cavity 42 is circumferentially arranged at the inner periphery of the outer wall of the lower part, the second annular hydraulic cavity 42 is communicated with the second hydraulic channel 8, and the second hydraulic channel 8 is communicated with a first hydraulic channel 70.
Specifically, the width of the second annular hydraulic chamber 42 is smaller than the width of the first annular hydraulic chamber 41. When pushing hydraulic pressure, the two annular hydraulic cavities of the liquid expansion body are not expanded simultaneously, but are expanded to the base first, and then the thin-wall workpiece 1 is further expanded, so that the logic sequence is realized through the fit clearance between the two liquid expansion parts, and the logic sequence can be realized through expanding the wall thickness of the thin-wall metal part.
Specifically, the diameter of the second hydraulic passage 8 is smaller than the diameter of the first hydraulic passage 70. When guaranteeing that hydraulic medium passes through when holding work piece 1 in the twinkling of an eye, lower dress portion inner wall inflation and the vertical through-hole close fit of base 2 form stable base structure, for liquid expanding the frock portion partition helical tooth of body 4 and work piece 1 inner wall centre gripping work provide stable condition, guarantee the precision of whole frock centre gripping process.
The corresponding large and small arrangement of the width of the hydraulic channel and the annular hydraulic cavity has the advantages of compact and light overall structure, meanwhile, the liquid expansion body 4 and the base 2 are expanded to form a whole, then the end face of the workpiece 1 is positioned on the base face, and the workpiece 1 is radially expanded as a fixture part with equally-divided inclined teeth, so that the axial positioning requirement of the workpiece 1 based on the end face is realized.
Referring to fig. 1 and 4, the liquid expansion fixture further comprises a lifting lug 6, the periphery of the upper mounting part of the liquid expansion body 4 is provided with a symmetrical tangential plane, the tangential plane and the top surface of the fixture part form a mounting position of the lifting lug 6, and the lifting lug 6 is in threaded fit with the fixture part through an external thread piece.
Specifically, the lifting lug 6 is provided with a chamfer 60 at a position facing the upper mounting part of the liquid expansion body 4, the upper part of the upper mounting part of the liquid expansion body 4 is conical, and the chamfer 60 forms a V shape relative to the conical shape. The purpose of the lifting lug 6 is to prevent the workpiece 1 from being blocked, the liquid expansion body 4 is conveniently pulled out, and the bevel 60 and the conical surface form a V shape, so that the operation is more convenient.
Specifically, in order to provide stable work platform for liquid body 4 that expands, base 2 is the ascending bowl form structure of opening, and the inside of base 2 includes slope transition surface 21 and vertical through-hole, and the frock portion bottom surface overlap joint of liquid body 4 that expands is at slope transition surface 21, and the lower dress portion of liquid body 4 that expands stretches into vertical through-hole mating connection.
Specifically, a boss 20 is inwardly arranged on the opening end surface of the base 2, the side surface of the boss 20 is contacted with the extending end of the clamping part, the top surface of the boss 20 is contacted with the workpiece clamping part 5, and the bottom surface of the clamping part of the workpiece 1 is contacted with the top surface of the opening end of the base 2 and is stopped at the boss 20. The extending end of work piece 1 bottom surface joint portion forms the neck position, and in the past frock design is just at its neck position and work piece 1 inner wall place an elasticity spacer, and the precision is low, and the clamping is inconvenient, and the precision is difficult to keep, and the setting of boss 20 on the base 2 open end provides the platform of placing the partition skewed tooth, and itself partition skewed tooth and the frock portion of liquid expanding body 4 are as an organic whole, and the metal inner wall inflation makes the partition skewed tooth synchronous conduction power under the liquid expanding action to the precision of this liquid expanding frock clamp has been guaranteed.
According to calculation and analysis, the thin-wall workpiece 1 is deformed after being subjected to certain internal supporting force, the inclination of the inclined teeth on the surface after deformation is changed, the measured inclination angle value is not an accurate true value, because the liquid expansion is the rigid expansion of the metal thin wall and requires quite large pressure to expand a certain amount, the principle is that the liquid expansion is high in precision, in order to accommodate the tolerance range of the workpiece 1, the force causing the expansion can be set on the upper tolerance of the aperture of the workpiece 1, when the workpiece 1 with the lower tolerance is installed, redundant pressure is conducted to the workpiece 1, the thin-wall workpiece 1 is difficult to resist, the workpiece 1 starts to elastically deform.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (9)
1. A high-accuracy flexible compound liquid expands frock clamp for thin wall work piece, including installing the liquid body that expands on the base, its characterized in that: the hydraulic expansion body comprises an upper mounting part, a tooling part and a lower mounting part, a first hydraulic channel is formed downwards in the middle of the top of the hydraulic expansion body, a hydraulic driving device is arranged on the outer wall of the tooling part, a first annular hydraulic cavity is formed in the inner circumference of the outer wall of the tooling part and communicated with the first hydraulic channel, a workpiece clamping part is arranged on the periphery of the outer circle of part of the tooling part, a plurality of equal-dividing helical teeth are circumferentially arranged on the workpiece clamping part, a clamping part is circumferentially arranged in the inner circumference of the bottom end of the workpiece, tooth-shaped contact surfaces of the equal-dividing helical teeth are in contact with the inner wall of the workpiece, the tooth-shaped contact surfaces of the equal-dividing helical teeth are axially overlapped on the extending end of the clamping part, and the lower mounting part of the hydraulic expansion body is in matched connection with the inner wall of the base;
the aliquoting helical gear is provided with a gear end and a gear root, the shrinkage of the bent gear end of the gear root of the single aliquoting helical gear occurs after the design pressure is received, the design pressure is set as P, and the shrinkage of the gear end is set asThe relationship between the inclination angle theta of the equal-dividing helical teeth and the tooth end shrinkage and the tooth length of each tooth is determined to satisfy the following formula:
wherein W is set as the thickness of each tooth root of each aliquoting tooth, and the unit is mm; n is equal number of teeth>The tooth end shrinkage is in mm; l (L) 1 As a single pieceTooth length of the teeth is in mm; />、/>、/>、/>Are all constant and take the values of-204.6, -6.489, 1583.461 and 2.066 respectively.
2. The high-precision flexible composite hydraulic expansion fixture for thin-walled workpieces of claim 1, wherein: the hydraulic driving device comprises a spanner, a fastener, a piston and a sealing element which are sequentially connected, the fastener is in threaded fit with the inner wall of the liquid expansion body at the position of the first hydraulic channel, the piston and the sealing element are positioned in the first hydraulic channel and are in sliding fit with the first hydraulic channel, and the first hydraulic channel is communicated with the first annular hydraulic cavity.
3. The high-precision flexible composite hydraulic expansion fixture for thin-walled workpieces of claim 1, wherein: the bottom of the lower mounting part of the liquid expansion body is provided with a second hydraulic channel upwards, a sealing piece is arranged in the second hydraulic channel, the outer wall of the lower mounting part is provided with a second annular hydraulic cavity inwards in the circumferential direction, the second annular hydraulic cavity is communicated with the second hydraulic channel, and the second hydraulic channel is communicated with the first hydraulic channel.
4. A high-precision flexible composite hydraulic expansion tooling fixture for thin-walled workpieces as defined in claim 3, wherein: the width of the second annular hydraulic chamber is smaller than that of the first annular hydraulic chamber.
5. A high-precision flexible composite hydraulic expansion tooling fixture for thin-walled workpieces as defined in claim 3, wherein: the diameter of the second hydraulic passage is smaller than the diameter of the first hydraulic passage.
6. The high-precision flexible composite hydraulic expansion fixture for thin-walled workpieces of claim 1, wherein: the liquid expansion body is characterized by further comprising a lifting lug, wherein a symmetrical tangential plane is arranged on the periphery of the upper mounting part of the liquid expansion body, the tangential plane and the top surface of the tool part form a mounting position of the lifting lug, and the lifting lug is in threaded fit with the tool part through an external threaded piece.
7. The high-precision flexible composite hydraulic expansion fixture for thin-walled workpieces as claimed in claim 6, wherein: the lifting lug is provided with an inclined tangent plane at the position facing the upper mounting part of the liquid expansion body, the upper part of the upper mounting part of the liquid expansion body is conical, and the inclined tangent plane forms a V shape relative to the conical shape.
8. The high-precision flexible composite hydraulic expansion fixture for thin-walled workpieces of claim 1, wherein: the base is of an upward bowl-shaped structure, the inside of the base comprises an inclined transition surface and a vertical through hole, the bottom surface of the tooling part of the liquid expansion body is lapped on the inclined transition surface, and the lower part of the liquid expansion body stretches into the vertical through hole to be connected in a matched mode.
9. The high-precision flexible composite hydraulic expansion fixture for thin-walled workpieces of claim 8, wherein: the opening end face of the base is internally provided with a boss, the side face of the boss is contacted with the extending end of the clamping part, the top face of the boss is contacted with the workpiece clamping part, and the bottom face of the clamping part of the workpiece is contacted with the top face of the opening end of the base and is stopped at the boss.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311377173.0A CN117102907B (en) | 2023-10-24 | 2023-10-24 | High-precision flexible composite liquid expansion tool clamp for thin-wall workpiece |
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| CN202311377173.0A CN117102907B (en) | 2023-10-24 | 2023-10-24 | High-precision flexible composite liquid expansion tool clamp for thin-wall workpiece |
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| CN117102907B true CN117102907B (en) | 2024-01-16 |
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| CN115070475A (en) * | 2022-08-03 | 2022-09-20 | 广州德马威工业装备制造有限公司 | Precision liquid expansion clamp |
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| JPH06609U (en) * | 1992-06-04 | 1994-01-11 | トーヨーエイテック株式会社 | Work holding device |
| US6179530B1 (en) * | 1996-08-23 | 2001-01-30 | Schunk GmbH & Co. KG Fabrik f{umlaut over (u)}r Spann - und Greifwerkzeuge | Expansion clamping chuck |
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|---|---|
| CN117102907A (en) | 2023-11-24 |
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