WO2021001929A1

WO2021001929A1 - Hydraulic clamping device and collar member

Info

Publication number: WO2021001929A1
Application number: PCT/JP2019/026316
Authority: WO
Inventors: 裕平伊藤; 山下　徹; 幸太郎湊
Original assignee: 黒田精工株式会社
Priority date: 2019-07-02
Filing date: 2019-07-02
Publication date: 2021-01-07
Also published as: CN113646129A; CN113646129B; JP7377868B2; JPWO2021001929A1

Abstract

[Problem] To clamp a member to be clamped by a hydraulic clamping device, with a high degree of coaxiality and straightness. [Solution] The present invention has a collar member 50 that is attached to the outer peripheral surface of a shell member 20 that defines a hydraulic chamber 22. The collar member 50 includes: a thick-walled cylindrical portion 52 having a predetermined wall thickness and having an outer peripheral surface 52A that holds a member W to be clamped; a pair of thin-walled cylindrical portions 54 extending outward in the axial direction from each axial end of the thick-walled cylindrical portion 52 and having a smaller wall thickness than the thick-walled cylindrical portion 52; and a plurality of slots 56 provided at a plurality of locations in the circumferential direction of the thick-walled cylindrical portion 52 and the pair of thin-walled cylindrical portions 54. Each of the slots 56 extends in a straight line in the axial direction of the collar member 50 from one thin-walled cylindrical portion 54 through the thick-walled cylindrical portion 52 to the other thin-walled cylindrical portion 54, leaving the outer end 58 of each of the thin-walled cylindrical portions 54. The outer end 58 of each of the thin-walled cylindrical portions 54 has a continuous annular shape over the entire circumference.

Description

Hydraulic clamp device and collar member

The present invention relates to a hydraulic clamp device and a collar member, and more particularly to a collar member used in the hydraulic clamp device and the hydraulic clamp device.

As a clamp device for holding a cylindrical member to be clamped, a cylindrical hydraulic chamber mounted on the outer circumference of the cylindrical clamp body and the clamp body and filled with a working liquid is defined. It has a cylindrical shell member (thin-walled cylindrical body) that elastically deforms in the radial direction due to the hydraulic pressure of the hydraulic chamber, and a pressurizing portion provided on the clamp body to pressurize the working liquid. A hydraulic type that clamps the clamped member fitted to the outer peripheral surface of the shell member or the outer peripheral surface of the slotted collar member mounted on the outer peripheral surface of the shell member by expanding the diameter of the shell member by the hydraulic pressure of the hydraulic chamber. Clamping devices are known (for example, Patent Documents 1 to 3).

Japanese Patent No. 4482501 Japanese Patent No. 6340493 US7142732 B2 publication

In the conventional hydraulic clamp device, when the working liquid in the hydraulic chamber is pressurized, almost the entire shell member and the collar member with a slot are deformed into a Japanese drum shape (crown shape), resulting in high coaxiality and straightness. It is difficult to clamp the member to be clamped.

An object to be solved by the present invention is to clamp a member to be clamped with a high degree of coaxiality and a high degree of straightness in clamping the member to be clamped by a hydraulic clamping device.

The hydraulic clamp device according to one embodiment of the present invention has a cylindrical hydraulic chamber mounted on the outer periphery of the cylindrical clamp main body and filled with a working liquid between the clamp main body. A cylindrical shell member that is defined and elastically deformed in the radial direction by the hydraulic pressure of the hydraulic chamber, a pressure portion provided on the clamp body to pressurize the working liquid, and an outer peripheral surface of the shell member. The collar member has a collar member to be mounted, and the collar member has a thick-walled cylindrical portion having a predetermined wall thickness and an outer peripheral surface for holding the clamped member, and an axis line from both shaft ends of the thick-walled cylindrical portion. A pair of thin-walled cylindrical portions extending outward in the direction and having a wall thickness smaller than that of the thick-walled cylindrical portion, and a plurality of slots provided at a plurality of locations in the circumferential direction of the thick-walled cylindrical portion and the pair of thin-walled cylindrical portions. Each slot comprises the axis of the collar member from one thin-walled cylindrical portion through the thick-walled cylindrical portion to the other thin-walled cylindrical portion, leaving the outer ends of each of the pair of thin-walled cylindrical portions. Each of the outer ends of the pair of thin-walled cylindrical portions extends linearly in the direction and has a ring shape that is continuous over the entire circumference.

According to this configuration, the member to be clamped can be clamped with high coaxiality and high straightness.

In the hydraulic clamp device, preferably, each of the pair of thin-walled cylindrical portions has a diameter-expanded portion having an inner diameter larger than the other region in the region including the outer end.

According to this configuration, the thin-walled cylindrical portion does not interfere with the shell member when each of the pair of thin-walled cylindrical portions is deformed.

In the hydraulic clamp device, preferably, the axial length of the thick cylindrical portion is equal to the axial length of the hydraulic chamber.

According to this configuration, the member to be clamped is clamped with even higher straightness.

In the hydraulic clamp device, the axial length of the thick-walled cylindrical portion may be shorter or longer than the axial length of the hydraulic chamber.

In the hydraulic clamp device, even if the axial length of the thick-walled cylindrical portion and the axial length of the hydraulic chamber are different, the outer ends of the pair of thin-walled cylindrical portions of the collar member are continuous over the entire circumference. Due to the annular shape, the unbalanced diameter expansion of the color member is restricted, and accurate straightness and coaxiality can be maintained.

In the hydraulic clamp device, preferably, the thick-walled cylindrical portion is at the same axial position as the position of 1/2 of the axial length of the hydraulic chamber is the same as the position of 1/2 of the axial length of the hydraulic chamber.

According to this configuration, the displacement in the diameter expansion direction of the thick-walled cylindrical portion due to the increase in the internal pressure of the hydraulic chamber is evenly performed when viewed in the axial direction, which contributes to the improvement of straightness.

The collar member according to one embodiment of the present invention is a collar member mounted on the outer peripheral surface of a hydraulic clamping device having an outer peripheral surface whose diameter is expanded by hydraulic pressure, has a predetermined wall thickness, and is clamped. A thick-walled cylindrical portion having an outer peripheral surface for holding a member, a pair of thin-walled cylindrical portions extending outward in the axial direction from both axial ends of the thick-walled cylindrical portion, and having a wall thickness smaller than that of the thick-walled cylindrical portion. It includes a thick-walled cylindrical portion and a plurality of slots provided at a plurality of locations in the circumferential direction of the pair of thin-walled cylindrical portions, and each slot is one of the thin-walled cylinder portions, leaving the outer ends of each of the pair of thin-walled cylindrical portions. It extends linearly in the axial direction from the cylindrical portion through the thick-walled cylindrical portion to the other thin-walled cylindrical portion, and the outer ends of each of the pair of thin-walled cylindrical portions extend over the entire circumference. It has a continuous ring shape.

According to this configuration, the member to be clamped can be clamped with high coaxiality and straightness.

According to the hydraulic clamping device and the collar member according to the present invention, the member to be clamped can be clamped with high coaxiality and high straightness.

Perspective view showing Embodiment 1 of a hydraulic clamp device and a collar member according to the present invention. A vertical sectional view showing an initial state of the hydraulic clamp device and the collar member of the first embodiment. A vertical sectional view showing a clamped state of the hydraulic clamping device and the collar member of the first embodiment. A vertical sectional view showing an initial state of the hydraulic clamp device and the collar member of the second embodiment. A vertical sectional view showing a clamped state of the hydraulic clamping device and the collar member of the second embodiment. A vertical sectional view showing an initial state of the hydraulic clamping device and the collar member of the third embodiment. A vertical sectional view showing a clamped state of the hydraulic clamping device and the collar member according to the third embodiment.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 3 show the first embodiment. The hydraulic clamp device 10 of the first embodiment has a metal columnar clamp body 12. The clamp body 12 is made of metal and has a flange portion 12A in the middle portion in the axial direction. The clamp body 12 is a shank portion 12B in which one side of the flange portion 12A is chucked by a rotating body (not shown) such as a machine tool, and the other side of the flange portion 12A is a mandrel for clamping the clamped member W. Part 12C. A ring-shaped work stopper 16 is fixed to the end surface of the flange portion 12A on the mandrel portion 12C side by bolts 14.

A cylindrical shell member 20 made of a thin cylindrical body is mounted on the outer circumference of the mandrel portion 12C. The shell member 20 has an inner peripheral surface 20A fitted to the outer peripheral surface 12D of the mandrel portion 12C and an outer peripheral surface 20B to which the inner peripheral surface 50A of the collar member 50 described later fits, and is locked to the outer peripheral surface of the mandrel portion 12C. It is sandwiched between the snap ring 18 and the end surface of the flange portion 12A, and movement in the axial direction is restricted.

A wide circumferential groove-shaped annular recess 12E is formed on the outer circumference of the mandrel portion 12C, more specifically, on the outer circumference of the portion where the shell member 20 is fitted. The mandrel portion 12C has a cylindrical shape, in other words, a cross-sectional shape (a cross section extending in a direction orthogonal to the central axis of the mandrel portion 12C) in cooperation with the shell member 20 in the portion of the annular recess 12E. The hydraulic chamber 22 of the above is defined. O-rings 24 for ensuring the liquidtightness of the hydraulic chamber 22 are attached to the outer peripheral surfaces 12D of the mandrel portion 12C on both sides of the hydraulic chamber 22 sandwiching the hydraulic chamber 22 in the axial direction. ing. The shell member 20 is elastically deformed in the diameter-expanding direction due to the hydraulic pressure (internal pressure) of the hydraulic chamber 22.

The mandrel portion 12C is formed with a piston chamber 26 extending in the axial direction on the central axis. A rod-shaped piston member 28 forming a pressurizing portion is fitted in the piston chamber 26 so as to be movable in the axial direction. The piston chamber 26 communicates with the hydraulic chamber 22 by

passages

30, 31 and 32 formed in the mandrel portion 12C. The hydraulic chamber 22, the piston chamber 26, the

passages

30, 31 and 32 are filled with the working liquid. That is, the hydraulic chamber 22 is filled with the working liquid.

The mandrel portion 12C is formed with a center pin hole 68 and a screw hole 34 extending along the central axis in the axial direction and opening toward the outer end of the mandrel portion 12C. A set screw member 36 is screw-engaged in the screw hole 34. The set screw member 36 screwes the screw hole 34 toward the piston chamber 26 by screwing, and the screwing causes the piston member 28 to move in the axial direction via the steel ball 38. By the movement of the piston member 28, the working liquid in the piston chamber 26, the

passages

30, 31 and 32 is pressurized, and the pressure of the working liquid rises. In this way, the piston member 28, the screw hole 34, and the set screw member 36 form a pressurizing portion that pressurizes the working liquid in the hydraulic chamber 22.

A center pin hole 70 is formed on the central axis of the outer end of the shank portion 12B. The center pin holes 68 and 70 are on the same axis.

The center runout measurement of the hydraulic clamp device 10 is performed in a state where the center pin C is engaged with each of the center pin holes 68 and 70 and both center pins C are held (supported by both centers).

A metal collar member 50 is mounted on the outer peripheral surface 20B of the shell member 20. The collar member 50 has a thick cylindrical portion 52 having a predetermined wall thickness and having an outer peripheral surface 52A holding a cylindrical member to be clamped W, and the thick cylindrical portion 52 outward from both axial ends in the axial direction. Includes a pair of thin-walled cylindrical portions 54 that are extended and have a smaller wall thickness than the thick-walled cylindrical portion 52. The thick-walled cylindrical portion 52 and the pair of thin-walled cylindrical portions 54 are on the same axis, and the inner peripheral surfaces of the

cylindrical portions

52 and 54 form the inner peripheral surface 50A of the collar member 50 having the same inner diameter. The inner peripheral surface 50A of the collar member 50 is fitted to the outer peripheral surface 20B of the shell member 20.

The wall thickness (outer diameter) of the thin-walled cylindrical portion 54 is set so as to have an appropriate elasticity that expands and deforms due to the expansion of the diameter of the shell member 20. The wall thickness (outer diameter) of the thick-walled cylindrical portion 52 is thicker than the wall thickness of the thin-walled cylindrical portion 54, and is set according to the inner diameter of the member W to be clamped. The position of 1/2 of the axial length of the thick-walled cylindrical portion 52 is the same as the position of 1/2 of the axial length of the hydraulic chamber 22, and the axial length A of the thick-walled cylindrical portion 52 is It is equal to the axial length B of the hydraulic chamber 22. As a result, the thick-walled cylindrical portion 52 is in a position where it overlaps the hydraulic chamber 22 in the radial direction over the entire axial direction.

Slots (splits) 56 are formed in each of the thick-walled cylindrical portion 52 and the pair of thin-walled cylindrical portions 54 at six locations separated at equal intervals in the circumferential direction. In each slot 56, the axial direction (generatrix direction) of the collar member 50 is reached from one thin-walled cylindrical portion 54 through the thick-walled cylindrical portion 52 to the other thin-walled cylindrical portion 54, leaving the outer end 58 of the thin-walled cylindrical portion 54. It extends linearly. All slots 56 are formed leaving the outer end 58 of each thin-walled cylindrical portion 54. That is, all the slots 56 are not opened outward from the outer ends 58 of the pair of thin-walled cylindrical portions 54 at both ends. Therefore, the outer end 58 of each thin-walled cylindrical portion 54 has a circular ring shape that is continuous over the entire circumference.

Both ends of each slot 56 have an expanded circular opening 56A in order to avoid stress concentration during elastic deformation of the thin-walled cylindrical portion 54. One of the circular openings 56A is fitted with a tip portion 62A of a set screw 62 screw-engaged with the screw hole 60 of the work stopper 16. As a result, the collar member 50 is prevented from rotating with respect to the shell member 20.

Further, each thin-walled cylindrical portion 54 has a diameter-expanded portion 64 having an inner diameter larger than that of the other regions in the region including the outer end 58.

Next, the clamping operation of the clamped member W by the hydraulic clamping device 10 using the collar member 50 will be described.

FIG. 2 shows an initial state in which the internal pressure (pressure of the working liquid) of the hydraulic chamber 22 is substantially atmospheric pressure, the shell member 20 has a cylindrical shape, and the collar member 50 is not elastically deformed. In this initial state, the member W to be clamped is set on the outer circumference of the thick cylindrical portion 52.

After setting the clamped member W, when the internal pressure of the hydraulic chamber 22 rises due to the movement of the piston member 28 due to the screwing of the set screw member 36, the shell member 20 is expanded and deformed as shown in FIG.

In response to the enlarged diameter deformation of the shell member 20, the thin-walled cylindrical portion 54 is elastically deformed into a substantially truncated conical shape with the connection portion with the thick-walled cylindrical portion 52 as a large diameter, and the width of each slot 56 is expanded. , The thick-walled cylindrical portion 52 is displaced outward in the radial direction so that the outer diameter of the thick-walled cylindrical portion 52 becomes large. As a result, the member W to be clamped is brought into close contact with the outer peripheral surface 52A of the thick cylindrical portion 52, and the member W to be clamped is fixed (clamped) to the outer periphery of the mandrel portion 12C via the collar member 50.

The thick-walled cylindrical portion 52 that holds the member to be clamped W is thicker than each thin-walled cylindrical portion 54, and has higher bending rigidity than each thin-walled cylindrical portion 54. As a result, the deformation of the collar member 50 according to the enlarged diameter deformation of the shell member 20 occurs exclusively in each thin-walled cylindrical portion 54, and the thick-walled cylindrical portion 52 can be deformed into a Japanese drum shape at the center of the clamp body 12. The diameter is evenly expanded and displaced in the radial direction without being inclined with respect to the axis. As a result, the clamped member W is clamped with high straightness and high accuracy.

Further, since the position of 1/2 of the axial length of the thick cylindrical portion 52 is the same as the position of 1/2 of the axial length of the hydraulic chamber 22, the thickness of the thick cylindrical portion 52 due to the increase in the internal pressure of the hydraulic chamber 22. The displacement of the meat cylinder portion 52 in the expansion direction is performed even more evenly when viewed in the axial direction. As a result, the clamped member W is clamped with higher accuracy and higher accuracy.

Further, since the outer end 58 of each thin-walled cylindrical portion 54 has a circular ring shape that is continuous over the entire circumference, the slit (slot) extends to the outer end 58 of the thin-walled cylindrical portion 54, and the thin-walled cylindrical portion 54. The coaxiality of the collar member 50 with respect to the clamp body 12 is higher than that in the case where the outer end 58 of the 54 is divided in the circumferential direction by grinding. As a result, the clamp member W is clamped with high coaxiality and with high accuracy.

Since each thin-walled cylindrical portion 54 has a diameter-expanded portion 64 having an inner diameter larger than the other region in the region including the outer end 58, even if the thin-walled cylindrical portion 54 is inclined and deformed with respect to the central axis of the clamp body 12. The enlarged diameter portion 64 acts as a relief portion, and the thin-walled cylindrical portion 54 does not interfere with the outer peripheral surface 20B of the shell member 20. As a result, the durability of the shell member 20 is improved.

Next, the hydraulic clamp device 10 of the second embodiment will be described with reference to FIGS. 4 and 5. In FIGS. 4 and 5, the parts corresponding to FIGS. 2 and 3 are designated by the same reference numerals as those given in FIGS. 2 and 3, and the description thereof will be omitted.

In the second embodiment, the position of 1/2 of the axial length of the thick-walled cylindrical portion 52 is the same axial position as the position of 1/2 of the axial length of the hydraulic chamber 22, but the thick-walled cylindrical portion 52 The axial length A is shorter than the axial length B of the hydraulic chamber 22.

As described above, even if the axial length of the thick-walled cylindrical portion 52 and the axial length of the hydraulic chamber 22 are different, the outer ends 58 of the pair of thin-walled cylindrical portions 54 of the collar member 50 cover the entire circumference. The continuous annular shape limits the unbalanced diameter expansion of the collar member 50, and maintains accurate straightness and coaxiality.

Next, the hydraulic clamp device 10 of the third embodiment will be described with reference to FIGS. 6 and 7. In FIGS. 6 and 7, the parts corresponding to FIGS. 2 and 3 are designated by the same reference numerals as those given in FIGS. 2 and 3, and the description thereof will be omitted.

In the third embodiment, the position of 1/2 of the axial length of the thick-walled cylindrical portion 52 is the same axial position as the position of 1/2 of the axial length of the hydraulic chamber 22, but the thick-walled cylindrical portion 52 The axial length A is longer than the axial length B of the hydraulic chamber 22.

The present invention has been described above with respect to preferred embodiments thereof, but as can be easily understood by those skilled in the art, the present invention is not limited to such embodiments and deviates from the gist of the present invention. It can be changed as appropriate as long as it does not.

For example, the position of 1/2 of the axial length of the thick-walled cylindrical portion 52 does not necessarily have to be at the same axial position as the position of 1/2 of the axial length of the hydraulic chamber 22, and they are mutually axial. It may be in a biased position. Then, a part of the axial length of the thick cylindrical portion 52 may be arranged so as to overlap a part of the axial length of the hydraulic chamber 22.

The number of slots 56 is not limited to 6, and may be a plurality of slots 56 other than 6, such as 3, 4, 8, etc., and it is preferable that the slots 56 are provided at equal intervals in the circumferential direction of the color member 50. .. The pressurizing portion is not limited to a manual type having a piston member 28, a screw hole 34, a set screw member 36, or the like, and may be an electric type or an electromagnetic type.

Further, not all of the components shown in the above-described embodiment are indispensable, and they can be appropriately selected as long as they do not deviate from the gist of the present invention.

10: Hydraulic clamping device 12: Clamp body 12A: Flange portion 12B: Shank member 12C: Mandrel portion 12D: Outer peripheral surface 12E: Circular recess 14: Bolt 16: Work stopper 18: Snap ring 20: Shell member 20A: Inner circumference Surface 20B: Outer peripheral surface 22: Hydraulic chamber 24: O-ring 26: Piston chamber 28: Piston member 30: Passage 31: Passage 32: Passage 34: Screw hole 36: Push screw member 38: Steel ball 50: Collar member 50A: Inner peripheral surface 52: Thick-walled cylindrical portion 52A: Outer peripheral surface 54: Thin-walled cylindrical portion 56: Slot 56A: Circular opening 58: Outer end 60: Screw hole 62: Set screw 62A: Tip portion 64: Expanded diameter portion 68: Center pin hole 70: Center pin hole A: Axial length B: Axial length C: Center pin W: Clamped member

Claims

Cylindrical clamp body and
A cylindrical shell member mounted on the outer periphery of the clamp body and defining a cylindrical hydraulic chamber filled with a working liquid between the clamp body and the clamp body.
A pressurizing portion provided on the clamp body and pressurizing the working liquid,
It has a collar member mounted on the outer peripheral surface of the shell member, and has.
The color member is
A thick cylindrical portion having a predetermined wall thickness and having an outer peripheral surface for holding the member to be clamped,
A pair of thin-walled cylindrical portions extending outward in the axial direction from both shaft ends of the thick-walled cylindrical portion and having a smaller wall thickness than the thick-walled cylindrical portion.
The thick-walled cylindrical portion and a plurality of slots provided at a plurality of locations in the circumferential direction of the pair of thin-walled cylindrical portions include.
Each slot is linear in the axial direction of the collar member from one thin-walled cylindrical portion through the thick-walled cylindrical portion to the other thin-walled cylindrical portion, leaving the outer ends of each of the pair of thin-walled cylindrical portions. It extends like a cylinder and
A hydraulic clamp device in which the outer ends of each of the pair of thin-walled cylindrical portions have a circular ring shape that is continuous over the entire circumference.
The hydraulic clamp device according to claim 1, wherein each of the pair of thin-walled cylindrical portions has an enlarged diameter portion having an inner diameter larger than that of the other region in a region including the outer end.
The hydraulic clamp device according to claim 1 or 2, wherein the thick cylindrical portion has an axial length equal to the axial length of the hydraulic chamber.
The hydraulic clamp device according to claim 1 or 2, wherein the thick cylindrical portion has an axial length shorter than the axial length of the hydraulic chamber.
The hydraulic clamp device according to claim 1 or 2, wherein the thick cylindrical portion has an axial length longer than the axial length of the hydraulic chamber.
The thick-walled cylindrical portion according to any one of claims 1 to 5, wherein the position of 1/2 of the axial length is the same as the position of 1/2 of the axial length of the hydraulic chamber. Hydraulic clamp device.
A collar member mounted on the outer peripheral surface of a hydraulic clamp device having an outer peripheral surface whose diameter is expanded by hydraulic pressure.
A thick cylindrical portion having a predetermined wall thickness and having an outer peripheral surface for holding the member to be clamped,
A pair of thin-walled cylindrical portions extending outward in the axial direction from both shaft ends of the thick-walled cylindrical portion and having a smaller wall thickness than the thick-walled cylindrical portion.
The thick-walled cylindrical portion and a plurality of slots provided at a plurality of locations in the circumferential direction of the pair of thin-walled cylindrical portions include.
Each slot extends linearly in the axial direction from one thin-walled cylindrical portion through the thick-walled cylindrical portion to the other thin-walled cylindrical portion, leaving the outer ends of each of the pair of thin-walled cylindrical portions. And
The outer end of each of the pair of thin-walled cylindrical portions is a collar member having a continuous ring shape over the entire circumference.