CN112475345A - Double-tensioning centering fixture - Google Patents
Double-tensioning centering fixture Download PDFInfo
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- CN112475345A CN112475345A CN202011305952.6A CN202011305952A CN112475345A CN 112475345 A CN112475345 A CN 112475345A CN 202011305952 A CN202011305952 A CN 202011305952A CN 112475345 A CN112475345 A CN 112475345A
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- expansion sleeve
- rubber expansion
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- 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
- B23B31/404—Gripping the work or tool by jaws moving radially controlled by conical surfaces
- B23B31/4053—Gripping the work or tool by jaws moving radially controlled by conical surfaces using fluid-pressure means to actuate the gripping means
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Abstract
The invention discloses a double-tensioning centering fixture, which comprises: the device comprises a fixing component, a first rubber expansion sleeve driving component and a second rubber expansion sleeve driving component; the fixing assembly includes: the flange plate and the taper body; the first rubber expansion sleeve driving component comprises: the rubber expansion sleeve is connected with the pull shaft body through a first thread; the second rubber expansion sleeve driving component comprises: the upper rubber expansion sleeve is sleeved on the top of the taper body, the pull rod is clamped with the upper rubber expansion sleeve, and the second threaded pull sleeve is connected with the lower end of the pull rod; the second thread pulling sleeve penetrates through the taper body, the pulling shaft body and the first thread pulling sleeve. Under the action of external force, the first threaded pull sleeve drives the lower rubber expansion sleeve to move downwards through the pull shaft body and the coupling ring and tightly tensions the lower inner diameter surface of the workpiece, and the second threaded pull sleeve drives the upper rubber expansion sleeve to move downwards through the pull rod and tightly tensions the upper inner diameter surface of the workpiece, so that the workpiece is integrally positioned. The fixture is stable in workpiece clamping and accurate in positioning.
Description
Technical Field
The invention relates to the technical field of processing of step hole thin-wall workpieces, in particular to a double-tensioning centering fixture for fixing step hole thin-wall workpieces.
Background
In the machining industry, various types of fixtures are available for positioning and machining different types of workpieces. However, the number of special fixtures designed for the stepped-hole thin-wall workpiece is small, the type is single, and the machining precision of the stepped-hole thin-wall workpiece is affected.
At present, when an excircle of a stepped-hole thin-wall workpiece is machined, the stepped-hole thin-wall workpiece is mainly positioned by the following two methods: the first method is to directly fix an inner hole at one end of a step hole workpiece by adopting a three-jaw chuck. After the three-jaw chuck is used for clamping, on one hand, calibration is carried out according to the jumping amplitude of the inner hole and the end face at the other end of the stepped hole workpiece, the process is time-consuming, the positioning efficiency is low, and the machining efficiency of the workpiece is reduced; on the other hand, because the wall of the step hole thin-wall workpiece is thin, when the three-jaw chuck is adopted to support the inner hole, the workpiece is easy to deform, the processing quality of the workpiece is influenced, and the rejection rate of workpiece processing is high.
The second conventional method is to process a stepped mandrel, to make the stepped mandrel and the stepped hole of the thin-wall sleeve type workpiece with stepped hole perform clearance fit, and to press-fit the other end of the thin-wall sleeve type workpiece with a nut. In the clamping mode, because a gap exists between the mandrel and the stepped hole of the thin-wall sleeve type workpiece with the stepped hole, the coaxiality between the excircle of the workpiece and the stepped hole is influenced, and the end face of the workpiece extruded by the nut is easy to deform due to the thin wall, so that the processing quality of the workpiece is influenced.
Therefore, the existing step hole thin-wall workpiece clamp is yet to be further developed.
Disclosure of Invention
The invention provides a double-tensioning centering fixture aiming at the structural characteristics of stepped thin-wall workpieces, and aims to solve the problems that the conventional fixture is difficult to accurately position and fix the stepped thin-wall workpieces and is easy to cause workpiece deformation.
The invention provides the following technical scheme:
a kind of double tight centring clamp that rises, it includes: the device comprises a fixing component fixedly connected with a machine tool, a first rubber expansion sleeve driving component used for positioning the upper inner diameter surface of the stepped hole thin-wall workpiece, and a second rubber expansion sleeve driving component used for positioning the lower inner diameter surface of the stepped hole thin-wall workpiece;
wherein, fixed subassembly includes: the taper body extends upwards from the center of the top surface of the taper body, and is provided with a through mounting through hole along a central axis;
the first rubber expansion sleeve driving component comprises: the lower part of the pulling shaft body is positioned in the inner cavity of the taper body, the top of the pulling shaft body penetrates through the cavity wall of the bottom of the taper body, the lower rubber expansion sleeve sleeved on the taper body, a coupling ring for connecting the top of the pulling shaft body with the lower end of the lower rubber expansion sleeve, and a first threaded pulling sleeve which is connected with the lower end of the pulling shaft body and penetrates through the flange plate; under the action of external force, the first threaded pull sleeve drives the lower rubber expansion sleeve to downwards extrude the taper body through the connected pull shaft body and the coupling ring, and the lower rubber expansion sleeve radially expands to expand the lower inner diameter surface of the step hole thin-wall workpiece;
the second rubber expansion sleeve driving component comprises: the upper rubber expansion sleeve is sleeved on the top of the taper body, the pull rod is clamped between the head of the upper rubber expansion sleeve and the lower rod of the pull rod in the mounting through hole, and the second threaded pull sleeve is connected with the lower end of the pull rod; the second thread pulling sleeve penetrates through the taper body, the pulling shaft body and the first thread pulling sleeve; under the action of external force, the second threaded pull sleeve drives the upper rubber expansion sleeve to downwards extrude the taper body through the connected pull rod, and the upper rubber expansion sleeve radially expands to expand the upper inner diameter surface of the step hole thin-wall workpiece.
Preferably, the fixed subassembly of two tight centering anchor clamps that rise still includes the supporting disk of connecting the cavity setting at tapering body seat top surface, sets up columniform that is linked together in the supporting disk and goes up cavity and cavity down, draws shaft body top, the coupling ring is located cavity down, lower rubber expansion cover is located cavity and the top exposes outside the supporting disk, goes up the cavity diameter and slightly is greater than the external diameter that rubber expansion was overlapped down, cavity down is greater than the thickness of coupling ring along the axial degree of depth of supporting disk, there is the stroke space between the bottom surface of coupling ring and top surface and cavity down cavity inner wall.
Preferably, the coupling ring comprises two semi-rings, the two semi-rings are clamped and/or screwed, first clamping grooves are formed in the inner side surfaces of the semi-rings along the circumferential direction and used for simultaneously clamping the top of the pulling shaft body and the bottom of the lower rubber expansion sleeve, and gaps exist among the inner walls of the first clamping grooves, the pulling shaft body and the lower rubber expansion sleeve in the radial direction.
Preferably, the pull shaft body consists of a disc-shaped main body positioned at the lower part and at least two connecting feet extending upwards along the top surface of the main body, the bottom of the disc-shaped main body is provided with a connecting part in threaded connection with the first threaded pull sleeve, and the middle part of the disc-shaped main body is provided with a through hole for the second threaded pull sleeve to freely penetrate through; the connecting pin is columnar, and the top end of the connecting pin is provided with a clamping pin which is used for being clamped with the first clamping groove of the coupling ring.
Preferably, the lower rubber expansion sleeve is formed by at least two metal clamping blocks which are distributed in the circumferential direction and an elastic rubber block which is bonded with the adjacent clamping blocks in a surrounding mode, a tapered through hole is formed in the middle of the anti-expansion chuck, the taper of the tapered through hole is consistent with the taper of the side wall of the tapered body, the edge of the bottom face of the lower rubber expansion sleeve is recessed along the radial direction to form an annular clamping groove, and the annular clamping groove is in clamping fit with the coupling ring.
Preferably, the upper rubber expansion sleeve is formed by at least two metal clamping blocks which are distributed circumferentially and an elastic rubber block which is bonded with the adjacent clamping blocks in a surrounding mode, a tapered hole penetrates through the middle of the upper rubber expansion sleeve, the taper of the tapered hole is consistent with the taper of the side wall of the tapered body, and a clamping portion which is clamped with the head portion of the pull rod extends inwards horizontally from the top surface of the upper rubber expansion sleeve.
Preferably, the pull rod comprises the positioning disk as the head and a rod part which is arranged at the lower part and is coaxially arranged with the positioning disk, the diameter of the top of the positioning disk is larger than the inner diameter of the top of the tapered hole of the upper rubber expansion sleeve, the bottom surface of the positioning disk extends downwards to form an annular connecting part, and the side surface of the annular connecting part is circumferentially provided with a clamping groove matched with the clamping part.
Preferably, the top surface of the lower rubber expansion sleeve extends upwards symmetrically to form a protrusion for acting on an inner cavity of a workpiece, the protrusion is recessed downwards from the ground to form a stepped groove, the bottom wall of the stepped groove is in clearance fit with the bottom surface of the upper rubber expansion sleeve, and the diameter of a cavity formed by the stepped groove is not smaller than the outer diameter of the bottom of the upper rubber expansion sleeve.
Preferably, the middle of the top surface of the flange plate is provided with a positioning groove, an axial limiting flange is installed in the positioning groove, a hole for the first threaded pull sleeve to penetrate through is formed in the middle of the axial limiting flange, the axial limiting flange is fixedly connected with the flange plate or the taper body, the cavity wall of the inner cavity of the taper body and the top surface of the axial limiting flange form a movable cavity, and an axial gap exists between the movable cavity and a disc-shaped main body of the pull shaft body located inside the movable cavity.
Preferably, the side surface of the taper body is provided with at least one pin hole for installing an anti-rotation pin, the side wall of the rod part of the pull rod is provided with a limit hole corresponding to the pin hole, and the difference between the longitudinal width of the limit hole and the diameter of the pin hole is not less than the displacement range of the pull rod in the longitudinal direction.
The double-tensioning centering fixture provided by the invention has the following beneficial effects:
1. the double-tensioning centering fixture is specially designed aiming at the structural characteristics of step-type thin-wall workpieces, the upper rubber expansion sleeves connected with the double-tensioning centering fixture are respectively driven by the two sets of rubber expansion sleeve driving assemblies, the lower rubber expansion sleeves fix different inner diameter surfaces of the workpieces, the workpieces are accurately positioned and stably clamped, the mounting and positioning efficiency is high, the processing zero degree of the workpieces is favorably improved, and the workpieces are not easily damaged. In addition, the clamp is convenient to install and maintain and easy to understand.
2. In the clamp, the second rubber expansion sleeve driving component is skillfully arranged in the first rubber expansion sleeve driving component, so that the two components are avoided in structure, mutual work is not influenced, and the overall structure is more compact.
3. The working principle is as follows: firstly, a first oil cylinder pulls a second threaded pull sleeve to move downwards to drive a pull rod and an upper rubber expansion sleeve to tension the upper inner diameter surface of the thin-walled workpiece of the stepped hole, and the workpiece is preliminarily positioned; and then, the second oil cylinder pulls the first thread pull sleeve to move downwards to drive the pull shaft body, and the pull shaft body pulls and props the lower rubber expansion sleeve through the coupling ring to support and tension the lower inner diameter surface of the workpiece. Therefore, different inner diameter surfaces of the step hole thin-wall workpiece are simultaneously tensioned under the combined action of the upper rubber expansion sleeve and the lower rubber expansion sleeve, the force is uniformly applied to the contact surface of the workpiece, the workpiece is accurately positioned, the workpiece is deformed, and the machining precision of the workpiece is improved.
Drawings
FIG. 1 is a schematic top view of a dual tensioning centering fixture of the present invention;
FIG. 2 is a plan sectional view taken in the direction A-A of FIG. 1;
FIG. 3 is a perspective cross-sectional view of a dual tensioning centering fixture;
fig. 4 is a schematic perspective view of the dual tensioning centering fixture of fig. 3 without the support plate;
FIG. 5 is an enlarged view of the structure of portion A in FIG. 2;
FIG. 6 is a schematic perspective view of the lower rubber expansion sleeve;
FIG. 7 is a schematic perspective view of the upper rubber expansion sleeve;
FIG. 8 is a schematic perspective view of a pull rod body;
FIG. 9 is a schematic longitudinal sectional view of the tapered body;
FIG. 10 is a configuration of a stepped bore thin wall workpiece;
wherein the reference numbers are as follows:
the device comprises a pull rod 1, a positioning disc 1a, a rod part 1b, a clamping groove 1c, a limiting hole 1d, an upper rubber expansion sleeve 2, a tapered hole 21, a clamping part 22, a stepped hole thin-wall workpiece 3, a lower rubber expansion sleeve 4, a tapered through hole 41, an annular clamping groove 42, a protrusion part 43, a supporting disc 5, a coupling ring 6, a half ring 61, a first clamping groove 62, a taper body 7, an inner cavity 71, a taper body 72, an installation through hole 73, a pull shaft body 8, a connecting pin 81, a disc-shaped main body 82, a clamping pin 83, an axial limiting flange 9, a flange plate 10, a first threaded pull sleeve 11, a second threaded pull sleeve 12 and an anti-rotation pin 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. As used in this specification, the terms "vertical," "horizontal," "left," "right," "up," "down," "inner," "outer," "bottom," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
As shown in fig. 1 to 5, a dual tensioning centering fixture includes: the device comprises a fixing component fixedly connected with a machine tool, a first rubber expansion sleeve driving component used for positioning the upper inner diameter surface of the stepped hole thin-wall workpiece 3, and a second rubber expansion sleeve driving component used for positioning the lower inner diameter surface of the stepped hole thin-wall workpiece 3. The first rubber expansion sleeve driving assembly and the second rubber expansion sleeve driving assembly respectively drive different inner side surfaces of corresponding rubber expansion sleeve expansion workpieces through the lifting motion of the relative fixing assembly, and accurate positioning of the stepped hole thin-wall workpiece is achieved.
In the present embodiment, fig. 10 shows a specific structure of a stepped-hole thin-walled workpiece 3 having a stepped hole in the middle, and the inner wall of the stepped hole is formed by an upper inner diameter surface 31 and a lower inner diameter surface 32 having different inner diameters.
Specifically, as shown in fig. 2 to 4, the fixing assembly sequentially includes, from bottom to top: the machine tool comprises a flange plate 10 connected with a main shaft of the machine tool and a taper body 7 connected above the flange plate. As shown in fig. 9, an inner cavity 71 opened downward is provided at the disc-shaped bottom of the taper body 7, a taper body 72 extends upward from the center of the top surface of the taper body, and a through mounting through hole 73 is provided along the central axis of the taper body 7. The flange 10 and the taper body 7 can be fixedly connected by fasteners such as screws, pins and the like.
The first rubber expansion sleeve driving component comprises: the lower part is located the interior chamber of tapering body and the top runs through the shaft body 8 that draws of tapering body bottom chamber wall, the lower rubber cover 4 that rises that the suit is on tapering body 72, the coupling ring 6 that goes on connecting draw shaft body top and lower rubber cover lower extreme that rises, connect and draw the shaft body lower extreme and pass through the first screw thread of flange 10 and draw the cover 11. Under the action of external force, the first threaded pull sleeve 11 drives the lower rubber expansion sleeve 4 to downwards extrude the taper body 72 through the connected pull shaft body 8 and the coupling ring, and the lower rubber expansion sleeve 4 radially expands to tension the lower inner diameter surface 32 of the stepped-hole thin-wall workpiece 3. When in use, the first thread pulling sleeve 11 can be connected with an external driving mechanism, such as an oil cylinder.
The second rubber expansion sleeve driving component comprises: the upper rubber expansion sleeve 2 is sleeved on the top of the taper body 72, the pull rod 1 is clamped with the upper rubber expansion sleeve at the head part and the lower rod part is positioned in the mounting through hole 73, and the second threaded pull sleeve 12 is connected with the lower end of the pull rod. The second thread pulling sleeve 12 penetrates through the taper body, the pulling shaft body and the first thread pulling sleeve. Under the action of external force, the second threaded pull sleeve 12 drives the upper rubber expansion sleeve 2 to downwards extrude the taper body 72 through the connected pull rod 1, and the upper rubber expansion sleeve 2 radially expands to expand the upper inner diameter surface 31 of the stepped hole thin-wall workpiece 3. When in use, the first thread pulling sleeve 11 can be connected with an external driving mechanism, such as another oil cylinder.
When the device works, the first oil cylinder pulls the second thread pull sleeve to move downwards to drive the pull rod and the upper rubber expansion sleeve to expand the upper inner diameter surface of the thin-walled workpiece with the stepped hole, and the workpiece is preliminarily positioned; and then, the second oil cylinder pulls the first thread pull sleeve to move downwards to drive the pull shaft body, and the pull shaft body pulls and props the lower rubber expansion sleeve through the coupling ring to support and tension the lower inner diameter surface of the workpiece. Therefore, different inner diameter surfaces of the stepped hole thin-wall workpiece are simultaneously tensioned under the combined action of the upper rubber expansion sleeve and the lower rubber expansion sleeve, force is uniformly applied to a workpiece contact surface, the workpiece is accurately positioned and is not easy to deform, and the processing precision of the workpiece is improved.
In the clamp, the second rubber expansion sleeve driving assembly is arranged in the first rubber expansion sleeve driving assembly, so that the two assemblies are avoided in structure, mutual work is not influenced, and the overall structure of the clamp is more compact.
Therefore, the fixture of the invention is suitable for step type workpieces, especially for step type thin-wall and long-bore parts, and the structure of the step type workpieces is not limited to the structure of fig. 10.
In this embodiment, the fixing component of the double-tensioning centering fixture further includes a supporting disk 5 screwed in the hollow arrangement of the top surface of the taper body seat 22, a cylindrical upper cavity and a cylindrical lower cavity which are communicated with each other are arranged in the supporting disk 5, the top of the pull shaft body and the coupling ring are located in the lower cavity, the lower rubber expansion sleeve 4 is located in the upper cavity, the top of the lower rubber expansion sleeve is exposed outside the supporting disk 5, the diameter of the upper cavity is slightly larger than the outer diameter of the lower rubber expansion sleeve 4, the axial depth of the lower cavity along the supporting disk 5 is larger than the thickness of the coupling ring 6, and a stroke gap exists between the bottom surface and the top surface of the coupling ring 6. The stroke gap enables the lower rubber expansion sleeve 4 and the coupling ring 6 to longitudinally displace relative to the taper body in a working range under the action of the tension of the pull shaft body 4, so that the lower rubber expansion sleeve 4 is ensured to generate proper radial deformation to tension the inner hole of a workpiece, and the lower rubber expansion sleeve 4 is prevented from being damaged due to transition expansion.
In this embodiment, the coupling ring 6 is provided to connect the pull shaft body and the lower rubber expansion sleeve into a whole. In order to facilitate the coupling ring to be connected with the pulling shaft body and the lower rubber expansion sleeve in a detachable manner, the following setting is carried out: as shown in fig. 4, the coupling ring 6 is composed of two half rings 61, the two half rings 61 are clamped and/or screwed, and the inner side surfaces of the half rings are circumferentially provided with first clamping grooves 62 for simultaneously clamping the top of the pull shaft body 8 and the bottom of the lower rubber expansion sleeve 4; gaps exist among the inner wall of the first clamping groove 62, the tension shaft body and the lower rubber expansion sleeve 4 in the radial direction, and the gaps allow the lower rubber expansion sleeve 4 to expand in the radial direction within a preset range, so that the normal work of the lower rubber expansion sleeve is ensured. In this embodiment, two semi-rings are in the same place through a fixture block spiro union, and both ends set up the spread groove respectively about the semi-ring, and the fixture block is through the spread groove of two semi-rings of joint respectively to link together the semi-ring, further, the fixture block both ends respectively with 2 semi-ring spiro unions.
As shown in fig. 8, the pull shaft body 8 is composed of a disk-shaped main body 82 located at the lower portion and at least two connection legs 81 (in this embodiment, three connection glues 81 are provided) extending upward symmetrically along the top surface of the main body, a connection portion screwed with the first threaded pull sleeve 11 is provided at the bottom of the disk-shaped main body 82, and a through hole for freely penetrating the second threaded pull sleeve 12 is provided at the middle portion of the pull shaft body 8.
The connecting pin 81 is columnar, and the top end of the connecting pin 81 is provided with a clamping pin 83 for clamping with the first clamping groove of the coupling ring. In order to avoid the abrasion of the contact surface caused by the deflection of the pulling shaft body relative to the lower rubber expansion sleeve 4 in the work, the following settings are carried out: the top of the connecting pin 81 is provided with a pin 84, the edge of the bottom surface of the lower rubber expansion sleeve 4 is recessed along the radial direction to form a plurality of second clamping grooves 45, the second clamping grooves 45 are matched with the connecting pin 84 in a clamping manner, and the number of the second clamping grooves is not less than that of the pins.
Preferably, as shown in fig. 6, the lower rubber expansion sleeve 4 is formed by at least two metal clamping blocks distributed circumferentially and an elastic rubber block bonded to the adjacent clamping blocks in a surrounding manner, a tapered through hole 41 is formed in the middle of the lower rubber expansion sleeve 4, the taper of the tapered through hole 41 is consistent with the taper of the side wall of the tapered body, the edge of the bottom surface of the lower rubber expansion sleeve 4 is recessed along the radial direction to form an annular clamping groove 42, and the annular clamping groove 42 is in clamping fit with the annular protrusion inside the coupling ring.
Preferably, the top surface of the lower rubber expansion sleeve 4 extends upwards symmetrically to form a plurality of protrusions 43 for acting on the inner cavity of the workpiece, the protrusions 43 are recessed downwards from the ground to form a stepped groove 44, the bottom wall of the stepped groove 44 is in clearance fit with the bottom surface of the upper rubber expansion sleeve 2, and the diameter of a cavity formed by the stepped groove 44 is not smaller than the outer diameter of the bottom of the upper rubber expansion sleeve 2. The arrangement of the stepped groove 44 avoids the structures of the two rubber expansion sleeves in space, so that the two rubber expansion sleeves can work normally, and the bottom wall of the stepped groove is in clearance fit with the bottom surface of the upper rubber expansion sleeve 2, so that the longitudinal displacement of the upper rubber expansion sleeve 2 is reasonably limited, and the influence on the service life of the upper rubber expansion sleeve due to transition expansion is avoided.
In this embodiment, the protrusion 43 of the lower rubber expansion sleeve 4 is 3 symmetrically arranged protrusions, which can save the manufacturing cost of the lower rubber expansion sleeve 4 to the maximum extent. In other embodiments, the protrusion 43 may be a protruding ring to reduce the difficulty of processing.
As shown in fig. 7 and 5, the upper rubber expansion sleeve 2 is formed by at least two metal clamping blocks which are circumferentially distributed and an elastic rubber block which is bonded with the adjacent clamping blocks in a surrounding manner, a tapered hole 21 penetrates through the middle part of the upper rubber expansion sleeve 2, the taper of the tapered hole 21 is consistent with the taper of the side wall of the tapered body, and a clamping part 22 which is clamped with the head of the pull rod extends inwards horizontally from the top surface of the upper rubber expansion sleeve 2.
As shown in fig. 4, 5 and 2, in order to better cooperate with the upper rubber expansion sleeve 2, the pull rod 1 is composed of a positioning disk 1a as a head and a rod part 1b which is positioned at the lower part and coaxially arranged with the positioning disk, the top diameter of the positioning disk 1a is larger than the top inner diameter of the tapered hole of the upper rubber expansion sleeve 2, an annular connecting part extends downwards from the bottom surface of the positioning disk, and a clamping groove 1c which is matched with the clamping part 22 is arranged on the side surface of the annular connecting part along the circumferential direction. When the rubber expansion sleeve works, the positioning plate supports the upper rubber expansion sleeve 2 from the upper part to the lower part, so that the upper rubber expansion sleeve moves downwards.
In order to better facilitate the installation and positioning of internal parts, the middle part of the top surface of the flange plate 10 is provided with a positioning groove, an axial limiting flange 9 is installed in the positioning groove, the middle part of the axial limiting flange 9 is provided with a hole for a first thread pull sleeve to penetrate through, the axial limiting flange 9 is fixedly connected with the flange plate or the taper body, the cavity wall of the inner cavity 71 of the taper body and the top surface of the axial limiting flange 9 enclose a movable cavity, an axial gap exists between the movable cavity and the disc-shaped main body 82 of the pull shaft body positioned inside the movable cavity, and the pull shaft body is allowed to move up and down to a certain degree in.
On the basis, in order to avoid that the pull rod 1 and the connected second thread are pulled to overlap and are rotated in the working process, and cause internal wear, the following settings are carried out:
as shown in fig. 5, at least one pin hole for installing the anti-rotation pin 13 is formed in the side surface of the taper body 72, and a limit hole 1d is formed in the side wall of the rod portion 1b of the pull rod corresponding to the pin hole, on one hand, the transverse width of the limit hole 1d is consistent with the outer diameter of the anti-rotation pin 13, so that the anti-rotation pin 13 axially positions the pull rod to prevent the pull rod from rotating. On the other hand, the difference between the longitudinal width of the limiting hole 1d and the diameter of the pin hole is not smaller than the displacement range of the pull rod 1 in the longitudinal direction, and the limiting hole 1d arranged in the way also ensures that the normal work (the up-down movement in a certain range) of the pull rod is not influenced by the anti-rotation pin.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
It should be understood that the technical solutions and concepts of the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.
Claims (10)
1. The utility model provides a two tight centering anchor clamps that rise which characterized in that includes: the device comprises a fixing component fixedly connected with a machine tool, a first rubber expansion sleeve driving component used for positioning the upper inner diameter surface of a stepped hole thin-wall workpiece (3), and a second rubber expansion sleeve driving component used for positioning the lower inner diameter surface of the stepped hole thin-wall workpiece (3);
wherein, fixed subassembly includes: the taper body (72) extends upwards from the center of the top surface of the taper body, and the taper body (7) is provided with a through mounting through hole (73) along the central axis;
the first rubber expansion sleeve driving component comprises: the lower part of the pulling shaft body is positioned in the inner cavity of the taper body, the top of the pulling shaft body penetrates through the cavity wall of the bottom of the taper body, the lower rubber expansion sleeve (4) sleeved on the taper body (72), a coupling ring (6) for connecting the top of the pulling shaft body with the lower end of the lower rubber expansion sleeve, and a first threaded pulling sleeve (11) which is connected with the lower end of the pulling shaft body and penetrates through the flange plate; the first threaded pull sleeve (11) drives the lower rubber expansion sleeve (4) to downwards extrude the taper body (72) through the connected pull shaft body (8) and the coupling ring under the action of an external force, and the lower rubber expansion sleeve (4) radially expands to expand the lower inner diameter surface of the stepped hole thin-wall workpiece (3);
the second rubber expansion sleeve driving component comprises: an upper rubber expansion sleeve (2) sleeved on the top of the taper body (72), a pull rod (1) with the head part clamped with the upper rubber expansion sleeve and the lower rod part positioned in the mounting through hole (73), and a second threaded pull sleeve (12) connected with the lower end of the pull rod; the second thread pulling sleeve (12) penetrates through the taper body, the pulling shaft body and the first thread pulling sleeve; the second threaded pull sleeve (12) drives the upper rubber expansion sleeve (2) to downwards extrude the taper body (72) through the connected pull rod (1) under the action of external force, and the upper rubber expansion sleeve (2) radially expands to expand the upper inner diameter surface of the stepped hole thin-wall workpiece (3).
2. The double-tensioning centering fixture as claimed in claim 1, wherein the fixing assembly further comprises a hollow supporting disk (5) connected to the top surface of the taper body seat (22), a cylindrical upper cavity and a cylindrical lower cavity which are communicated with each other are arranged in the supporting disk (5), the top of the pull shaft body and the coupling ring are located in the lower cavity, the lower rubber expansion sleeve (4) is located in the upper cavity, the top of the lower rubber expansion sleeve is exposed out of the supporting disk (5), the diameter of the upper cavity is slightly larger than the outer diameter of the lower rubber expansion sleeve (4), the axial depth of the lower cavity along the supporting disk (5) is larger than the thickness of the coupling ring (6), and a stroke gap exists between the bottom surface and the top surface of the coupling ring (6) and the inner wall of the lower cavity.
3. The double-tensioning centering fixture as claimed in claim 1, wherein the coupling ring (6) is composed of two half rings (61), the two half rings (61) are clamped and/or screwed, first clamping grooves (62) for simultaneously clamping the top of the pulling shaft body (8) and the bottom of the lower rubber expansion sleeve (4) are formed in the inner side surfaces of the half rings along the circumferential direction, and a gap exists between the inner walls of the first clamping grooves (62) and the pulling shaft body and the lower rubber expansion sleeve (4) in the radial direction.
4. The double-tensioning centering fixture as claimed in claim 3, wherein the pull shaft body (8) is composed of a disc-shaped main body (82) at the lower part and at least two connecting feet (81) extending upwards along the top surface of the main body, the bottom of the disc-shaped main body (82) is provided with a connecting part screwed with the first threaded pull sleeve, and the middle part of the disc-shaped main body is provided with a through hole for the second threaded pull sleeve to freely penetrate through; the connecting pin (81) is columnar, and a clamping pin (83) used for being clamped with the first clamping groove of the coupling ring is arranged at the top end of the connecting pin (81).
5. The double-tensioning centering fixture as claimed in claim 4, wherein the lower rubber expansion sleeve (4) is formed by at least two circumferentially distributed metal clamping blocks and an elastic rubber block bonded with the adjacent clamping blocks in a surrounding manner, a tapered through hole (41) is formed in the middle of the anti-expansion chuck (3), the taper of the tapered through hole (41) is consistent with the taper of the side wall of the tapered body, the edge of the bottom surface of the lower rubber expansion sleeve (4) is radially recessed to form an annular clamping groove (42), and the annular clamping groove (42) is in clamping fit with the coupling ring.
6. The double-tensioning centering fixture as claimed in claim 1 or 5, wherein the upper rubber expansion sleeve (2) is formed by enclosing at least two circumferentially distributed metal clamping blocks and an elastic rubber block for bonding the adjacent clamping blocks, a tapered hole (21) is formed in the middle of the upper rubber expansion sleeve (2) in a penetrating manner, the taper of the tapered hole (21) is consistent with the taper of the side wall of the tapered body, and a clamping portion (22) clamped with the head of the pull rod extends inwards from the top surface of the upper rubber expansion sleeve (2).
7. The double-tensioning centering fixture as claimed in claim 1, wherein the pull rod (1) is composed of a positioning disk (1a) as a head and a rod part (1b) which is positioned at the lower part and is coaxially arranged with the positioning disk, the top diameter of the positioning disk (1a) is larger than the top inner diameter of the tapered hole of the upper rubber expansion sleeve (2), an annular connecting part extends downwards from the bottom surface of the positioning disk, and a clamping groove (1c) matched with the clamping part (22) is circumferentially arranged on the side surface of the annular connecting part.
8. The double-tensioning centering fixture as claimed in claim 5, wherein the top surface of the lower rubber expansion sleeve (4) extends upwards symmetrically to form a protrusion (43) for acting on the inner cavity of the workpiece, the protrusion (43) is recessed downwards from the ground to form a stepped groove (44), the bottom wall of the stepped groove (44) is in clearance fit with the bottom surface of the upper rubber expansion sleeve (2), and the diameter of a cavity formed by the stepped groove (44) is not less than the outer diameter of the bottom of the upper rubber expansion sleeve (2).
9. The double-tensioning centering fixture as claimed in claim 1, wherein a positioning groove is formed in the middle of the top surface of the flange plate (10), an axial limiting flange (9) is mounted in the positioning groove, a hole for the first threaded pull sleeve to penetrate through is formed in the middle of the axial limiting flange (9), the axial limiting flange (9) is fixedly connected with the flange plate or the taper body, a movable cavity is formed by the cavity wall of an inner cavity (71) of the taper body and the top surface of the axial limiting flange (9) in a surrounding mode, and an axial gap exists between the movable cavity and a disc-shaped main body (82) of the pull shaft body located inside the movable cavity.
10. The double-tensioning centering fixture as claimed in claim 1, wherein the side surface of the taper body (72) is provided with at least one pin hole for installing the rotation prevention pin (13), the side wall of the rod part (1b) of the pull rod is provided with a limiting hole (1d) corresponding to the pin hole, and the difference between the longitudinal width of the limiting hole and the diameter of the pin hole is not less than the displacement range of the pull rod (1) in the longitudinal direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011305952.6A CN112475345B (en) | 2020-11-19 | 2020-11-19 | Double-tensioning centering fixture |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011305952.6A CN112475345B (en) | 2020-11-19 | 2020-11-19 | Double-tensioning centering fixture |
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| CN112475345A true CN112475345A (en) | 2021-03-12 |
| CN112475345B CN112475345B (en) | 2022-02-11 |
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| CN114310718A (en) * | 2022-01-12 | 2022-04-12 | 中国第一汽车股份有限公司 | Rapid positioning and fixing device and fixing method for hole-series part |
| CN114354094A (en) * | 2021-12-31 | 2022-04-15 | 泰州优麦精密机械有限公司 | Rear-pull type internal-expansion zero-displacement airtight detection clamp for numerical control machine tool |
| CN118372012A (en) * | 2024-06-24 | 2024-07-23 | 常州市德威盛汽车部件有限公司 | Spring press-fitting mechanism for shock absorber production and press-fitting method thereof |
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| CN112475345B (en) | 2022-02-11 |
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