WO2003037556A1

WO2003037556A1 - Face clamp chuck and face clamp method

Info

Publication number: WO2003037556A1
Application number: PCT/JP2002/011437
Authority: WO
Inventors: Hiroshi Hachiro
Original assignee: Ohfuna Netsuren Co., Ltd.
Priority date: 2001-11-02
Filing date: 2002-10-31
Publication date: 2003-05-08
Also published as: JP2005177866A

Abstract

A face clamp method, comprising the steps of towing a draw bolt (24) to press-fit a collet pulling arrow (23) onto a tapered surface (21a) formed in a collet body (21) so as to increase the diameters of collet pieces in order to center the inner diameter part of a ring-shaped work (W), applying a hydraulic pressure to the right side chambers of pistons (32) in surface pressing cylinders (31) to swing retaining claws (36) to a clamp position to hold the work (W) in the clearance thereof from work patch parts (40) for face clamping, solely moving back the collet body (21) to an escape position by a draw pipe (22), invading a cutting tool from the front surface side of a face clamp chuck into the inner diameter surface of the work (W), and cutting the work (W) while moving the cutting tool to a bottom side, whereby, by using the collet chuck for the centering operation of the ring-shaped work, a centering can be efficiently and easily performed based on the inner diameter surface of the ring-shaped work.

Description

TECHNICAL FIELD Face clamp chuck and face clamp method

The present invention relates to a face clamp chuck attached to a main shaft of a lathe, and more particularly, to a face clamp chuck for centering the inner diameter of a ring-shaped work with a collet chuck and performing face clamp with a holding claw in the centered state, and Consider the face clamp method. Background art

Conventionally, a face clamp chuck used to cut the inner diameter of a ring-shaped work using a lathe, etc., is a ring on the circumference of a chuck mounting base attached to the main shaft of a lathe or the like. In addition to providing a work abutment that supports the workpiece, a plurality of swinging and rotating holding claws are provided at equal intervals on the outer circumference of the work abutment, and at the center of the chuck mounting base. There has been known a face clamp chuck which is provided with a centering mechanism using a taper surface or the like to facilitate the work centering work (for example, see Japanese Patent Application Laid-Open No. 9-66410).

In the case of a face clamp chuck that performs centering using a face clamp chuck equipped with a centering mechanism using a tapered surface, the inner diameter surface of the ring-shaped work is tapered at the center of the chuck mounting base. Since the workpiece is clamped and face-clamped using a plurality of holding claws in that state, the centered ring-shaped work moves when it is clamped by the holding claws, There was a risk of displacement, and as it was, it was not possible to accurately center the inner surface of the work, resulting in poor work efficiency.

The present invention has been made in view of the above circumstances, and in a face clamp chuck, by using a collet chuck as a ring-shaped centering means, centering based on the inner diameter surface of a ring-shaped work. The purpose is to perform the task efficiently and easily. Further, the face clamp chuck includes a centering mechanism composed of a collect chuck, a plurality of surface press cylinders arranged at equal intervals on an outer circumference of the collect chuck, and a plurality of press claws driven by the surface press cylinder. The purpose is to make the whole structure compact by the clamp mechanism.

In addition, a plurality of pressing claws provided at equal intervals on the circumference of the chuck mounting base are hydraulically driven by surface pressing cylinders, respectively, so as to eliminate variations in the pressing force among the plurality of pressing claws. I do.

Another object of the present invention is to facilitate the inner diameter machining and surface machining of a ring-shaped workpiece by centering the inner diameter of the ring-shaped workpiece using a collet chuck, clamping the outer peripheral surface, and then retracting the collet chuck. I do. Disclosure of the invention

In order to solve the above problems, the invention according to claim 1 is characterized in that a collet main body and a collet pulling arrow that are movable in the axial direction are provided at the center of the chuck mounting base, and the outer periphery of the collet main body is provided. It is characterized by a face clamp chuck provided with a plurality of surface holding cylinders and a plurality of pressing claws driven by the surface pressing cylinders. The work can be centered on the basis of the reference, and the work is clamped and face-clamped by a plurality of holding claws and a work clamp operated by fluid pressure, so there is no difference in the pressing force between the plurality of holding claws. In addition, the work is not partially deformed.

A second aspect of the present invention is the face clamp chuck according to the first aspect, wherein a work abutment is provided between the collet main body and the face holding cylinder. The work can be clamped between the gold and the plurality of presser claws and fixed firmly.

A third aspect of the present invention is the face clamp chuck according to the first or second aspect, wherein the collet body is fixed to the draw pipe, and the collet drawer is connected to the draw pipe. It is characterized in that it is fixed to the passed drawer port, so that the centering mechanism can be compactly arranged on the chuck mounting base, and the external shape of the face clamp chuck can be made smaller. A fourth aspect of the present invention is the face clamp check according to the third aspect, wherein the draw pipe and the draw port are driven by cylinders, respectively. Can be accurately driven with a sufficient driving force.

The invention according to claim 5 is characterized in that the inner diameter of the ring-shaped work is centered by the collet body and the collet drawer, and the outer peripheral surface of the ring-shaped work is provided on the outer periphery of the collet body. It is characterized in that it is a face clamping method of clamping with a claw and then retracting the collet main body and the collet pulling arrow, so that even if the workpiece has an irregular outer shape, the workpiece is centered using the inner diameter and clamped. Further, the inner peripheral surface and the surface of the ring-shaped work can be easily processed by retracting the collet after the clamp and the collet drawer to the rear. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an overall assembly view showing a state in which a preferred face clamp chuck of the present invention is attached to a main shaft of a lathe, and FIG. 2 is a longitudinal sectional view of the face clamp chuck shown in FIG. FIG. 3 is a front view of a chuck mounting base used in the face clamp check shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 shows a preferred face clamp chuck A according to the present invention

FIG. 2B is an overall assembly drawing showing a state in which the double-cylinder device C and the double-cylinder device C are attached to the main spindle of the lathe in a partial cross section.

The face clamp chuck A of the present invention includes a chuck mounting base 10, a centering mechanism 20, a clamp mechanism 30, a work abutment 40, etc., and the center of the chuck mounting base 10. The centering mechanism 20 is arranged on the shaft, and the work contact part 40 is located on the same circumference outside the centering mechanism 20 and the clamp mechanism is located on the same circumference. 30 is provided. The lubricating device B is composed of a rotary valve and supplies pressure oil from an external hydraulic source to the clamp mechanism 30.The double cylinder device C has concentric double cylinders and And a rotation valve for supplying the pressure, and controls the centering mechanism 20.

FIG. 2 is a longitudinal sectional view of the face clamp chuck of the present invention, and FIG. 3 is a front view of a chuck mounting base used in the face clamp chuck shown in FIG.

The chuck mounting base 10 is mounted on a spindle protruding from the headstock L of the lathe, and has a pipe fitting 11 on an inner diameter portion. The chuck mounting base 10 is formed with four chuck opening oil guide holes 13 as well as four chuck opening oil guide holes 13 radially from the inner diameter part. An opening 14 communicating with 13 is provided. The four chuck closing oil guide holes 12 and the four chuck opening oil guide holes 13 are used to connect the two oil guide holes in the pipe fitting 11 so that each of them is integrated into one. The two oil guide pipes for opening 15 and two oil guide pipes for closing 16 are connected via the headstock L and guided to the oil supply device B.

The centering mechanism 20 for centering the work W is composed of a collet body 21, a draw pipe 22, a collet drawer 23, a draw bolt 24, and the like.

The collet body 21 has a substantially cup shape as a whole, has, for example, six axial slits on the side wall, and has a tapered surface 21a formed on the inner surface at the upper end of the side wall. It is fixed to the draw pipe 22 via a ported pipe fixing bracket 25 by screwing and a nut. The draw pipe 22 penetrates the piping fitting 11 of the chuck mounting base 10 and is guided to the double cylinder device C, and the collet body 21 is axially moved by the chuck drive cylinder built in the outer peripheral side. It can be driven.

A chuck jaw 21 is removably attached to the outer surface of the upper end of the side wall of the collet body 21 by a port, and the chuck jaw 21b is provided with an appropriate configuration. By exchanging, the size and shape of the work W can be handled.

Facing the taper surface 21 a formed on the collet body 21, a tape is A collet drawer 23 having a par surface 23a is arranged, and the collet drawer 23 is fixed to a tip of the draw bolt 24 by a nut. The draw port 24 is passed through the draw pipe 22, penetrates the spindle of the lathe and the headstock L, is guided to the double cylinder device C, and has a chuck built in the inner peripheral side of the double cylinder device C. The open / close cylinder allows the collet drawer 23 to be pushed into the tapered surface 21 a of the collet body 21, or to be pushed out from the tapered surface 21 a of the collet body 21.

1 and 2, when the collet drawer 23 is pulled to the left together with the draw port 24, the tapered surface 23a formed on the collet drawer 23 is formed on the collet body 21. The pieces of the collet body 21 are expanded in diameter and engaged with the inner diameter of the ring-shaped workpiece W to perform chucking and centering. Further, the collet body 21 can move forward and backward independently of the collet body 21 by the draw pipe 22 and can retreat from the state shown in FIG. 1 to the retracted position.

At this time, a collet guide 26 is provided on the back surface of the collet drawer 23, and a collet guide 27 is provided on the collet body 21. The drawbars 23 can move smoothly in the axial direction.

The upper half of FIG. 1 shows a state in which the draw pipe 22 is pushed out, the draw port 24 is pulled in, and the collect body 21 is centering the work W. The lower half of the figure shows a state in which the centering of the workpiece W has been completed and the face clamp has been performed by the holding claws 36.

The work support part 40 is substantially ring-shaped and includes a support base 41 and a work support 42. The support base 41 is bolted to the chuck mounting base 10 and the support base 4 1 In contrast, by replacing the work allowance 42 with an appropriate size and shape, a work W of an appropriate size and shape can be accommodated. The inner surface of the ring-shaped base 41 also functions as a guide when the collet body 21 moves in the axial direction.

The clamp mechanism 30 is centered on the work piece 42 of the work piece part 40, and the clamp body 21 is used to face-clamp the work W installed in a temporarily fixed state. · Pressing pawl 3 6 that swings up and down by the piston mechanism Have.

Four face holding cylinders 31 are attached to the chuck mounting base 10 with bolts, and the connecting rod 34 swings on the piston rod 33 of the piston 32 that slides inside the face holding cylinder 31. It is freely pivoted. A presser pawl support 35 is ported to the surface presser cylinder 31, and a presser pawl 36 is pivotally mounted on the tip of the cylinder 31 so as to swing upward and downward. The distal end and the distal end of the connecting rod 34 are pivotally attached to each other. The presser claw 36 is composed of a presser claw base 36a and a work clamp claw 36b. By replacing the work presser claw 36b, it is possible to cope with a work W of an appropriate size. it can.

In addition, an example is shown in which four surface holding cylinders 31, holding claw columns 35, holding claws 36, etc. forming the clamp mechanism 30 are provided at equal intervals on the same circumference. Is an example, and any number such as 3, 4, 5, 6, etc. can be used depending on the work.

The face holding cylinder 31 has an oil guide hole 37 communicating with the right side chamber of the piston 32, and the chuck mounting base 10 has a chuck closing oil guide hole 12 through an oil guide hole 3. By applying hydraulic pressure to the piston 32 via the, the presser pawl 36 is swung to the clamp position (closed state) via the piston rod 33 and the connecting rod 34 to move the workpiece W to the workpiece. It can be clamped by being sandwiched between the metal part 40. At this time, the left side chamber of the piston 32 communicates with the chuck opening oil guide hole 13 of the chuck mounting base 10 through the opening 14 provided in the chuck mounting base 10.

Also, in a closed state where the presser pawl 36 is face-clamping the work W, the presser pawl 36 is moved to the open position (open state) by supplying hydraulic pressure to the chuck opening oil guide hole 13. be able to.

The face clamp chuck A according to the embodiment has the above-described configuration. However, for the face clamp chuck A, an oil supply device B that supplies oil pressure to the four face holding cylinders 31 and a draw pipe 22 are provided. The outline of the chuck, drive cylinder, and chuck opening / closing cylinder of the double cylinder device C that drives the draw port 24 by pushing and pulling will be described.

The lubricator B that supplies hydraulic pressure to the four face holding cylinders 3 1 is located on the back side of the headstock L. The hydraulic pressure supplied from a hydraulic pump (not shown) via a switching valve is connected to the pipe fitting 11 of the face clamp chuck A via a rotary valve shaft built in the lubricator B. Distributed to the rotating side of the two oil guide pipes 15 (connected to the oil guide holes 12 for closing the chuck) and the two oil guide pipes 16 (connected to the oil guide holes 13 for opening the chuck) It is.

Double cylinder device C has a built-in rotary valve, chuck driving cylinder, and chuck opening / closing cylinder, and has a configuration in which the chuck driving cylinder is coaxially compactly arranged around the periphery of the chuck opening / closing cylinder.

The chuck drive cylinder slides the draw pipe 22 to move the collet body 21 forward and backward, and the chuck opening / closing cylinder slides the draw bolt 24 to move the collet body 21 in the forward position. Open and close each collet piece. The hydraulic pressure supplied to the chuck driving cylinder and the chuck opening / closing cylinder is supplied from a hydraulic pump (not shown) via a switching valve via a rotary valve built in the double cylinder device C.

An operation of cutting or grinding the inner diameter of the ring-shaped work W using the face clamp chuck according to the embodiment of the present invention will be described.

(1) With the main shaft stopped and the presser pawl 36 open, the collet body 21 is driven to the forward position together with the collet puller 23 by the chuck driving cylinder built in the double cylinder device C. The workpiece W is supported by the collect body 21 and the work allowance 42.

(2) Next, the collet drawer 23 is driven to the chuck mounting base 10 side by the chuck driving cylinder built in the double cylinder device C, and the taper surface 23a of the collet drawer 23 is collected. The collet body 21 is pressed into the taper surface 21 a of the main body 21, and the collet body 21 is temporarily engaged with the inner peripheral surface of the enlarged diameter ring-shaped workpiece W.

(3) Next, hydraulic pressure is applied from the oil supply device B to the right chamber of the face holding cylinder 31 via the oil guide pipe 15 for opening and the oil guide hole 12 for closing the chuck, and the holding claw 36 is rocked. And press the outer peripheral surface of the ring-shaped work W onto the work abutment 42 to clamp it.

(4) Thereafter, the pressing of the collet puller 23 against the collet body 21 is released, and the engagement between the ring-shaped workpiece W and the collet body 21 is released. Drive 1 and the collet pulling arrow 2 3 to the chuck mounting base 10 side.

(5) As a result, the collet body 21 and the collet drawer 23 recede to a position separated from the ring-shaped work W, and a space is formed behind the inner diameter portion of the ring-shaped work W.

(6) Next, a cutting tool, a grinding tool, etc. are inserted from the inner diameter of the ring-shaped work W and processing is performed. Also, the surface of the ring-shaped workpiece W is processed.

(7) When the specified processing is completed, open the presser pawl 36, remove the processed ring-shaped work W, and return the face clamp chuck to the initial state.

In the embodiment described above, the four face pushing cylinders 31 of the face clamp chuck A and the chuck driving cylinder and the chuck opening / closing cylinder incorporated in the double cylinder device C are hydraulic cylinders, respectively. Not only a hydraulic cylinder but also a pneumatic cylinder using compressed air can be used.

As apparent from the above description, the present invention has the following effects. According to the present invention, a collet main body and a collet drawer which are movable in the axial direction are provided at the center of the chuck mounting base, and the collet chuck can center the inner diameter surface of the work, and the work is even machined. If this is the case, it is possible to perform highly accurate inner diameter and surface processing even if the outer shape and the end face are irregular.

Also, since the work is clamped and clamped between the work abutment and the presser claws by a plurality of presser claws operated by fluid pressure, there is no difference in the pressing force between the plurality of presser claws. It is possible to perform highly accurate machining of the inner diameter surface and surface without causing irregular deformation of the workpiece.

The collet body is fixed to the end of the draw pipe, and the collet drawhead is fixed to the end of the draw bolt passed through the draw pipe, so the centering mechanism is compacted at the center of the chuck mounting base. And the outer shape of the face clamp chuck can be reduced.

Further, since the draw pipe and the draw bolt are respectively driven by the centering cylinder mechanism, the draw pipe and the draw bolt can be accurately driven with a sufficient driving force.

Further, the present invention provides a method for centering using the inner diameter of a ring-shaped work, and clamping the outer peripheral surface. By retracting the collet after the clamp and the collet drawer, a space is created near the inner diameter, and the inner peripheral surface and the surface can be easily processed.

Claims

The scope of the claims

1. A collet main body and a collet drawer are provided at the center of the chuck mounting base so as to be movable in the axial direction, and a plurality of surface pressing cylinders and a plurality of surface driving cylinders driven by the surface pressing cylinder are provided on the outer periphery of the collet body. Face clamp chuck characterized by having a holding claw.

2. In the face clamp check according to claim 1,

A face clamp chuck, wherein a work abutment is provided between the collet body and the surface holding cylinder.

3. The face clamp chuck according to claim 1 or 2, wherein the collet body is fixed to a draw pipe, and the collet drawhead is fixed to a draw bolt passed through the draw pipe. Featuring a scrunch petitack.

4. In the face clamp check according to claim 3,

A face clamp chuck, wherein the draw pipe and the draw port are each driven by a cylinder.

5. Center the inner diameter of the ring-shaped work with the collet main body and the collet pulling arrow, clamp the outer peripheral surface of the ring-shaped work with the presser claw provided on the outer periphery of the collet body, and then use the collet. A face clamping method comprising retreating a main body and a collet drawer.