JPH044091B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a clamping device in which one of the clamping members is movable, and also relates to a device that can be used for double cutter processing and relief in a lathe.

Conventional techniques and problems When turning two parallel surfaces or the inner and outer diameters of a workpiece, in order to maintain the accuracy of parallelism and concentricity of the machined surfaces, turning the two parallel surfaces or the inner and outer diameters are performed simultaneously. There is a machining method, in which a double cutter is used to cut both sides or the inner and outer diameters of the workpiece.

During the above-mentioned inserting process, if both sides and the inner and outer diameters are turned simultaneously using a fixed tool,
During the return stroke of the tool, contact of the tool with the workpiece occurs and a tool return mark is generated.

The occurrence of the tool return mark causes deterioration of the surface roughness of the machined surface that has been turned with high cutting angle accuracy, and if the turned surface is used as a sealing surface, seal breakage will occur, which will only impair the sealing effect. In addition, it can also be a factor that has an adverse effect on finishing processes such as polishing and plating in post-processing after turning, so treatments to prevent tool return marks from being applied to the workpiece have been considered.

In the case of turning with a single tool, it is relatively easy to move the tool or workpiece away from the tool during the tool return process, and then return it while maintaining accuracy just before the next turning process. In machining with a double cutter, movement of the workpiece side cannot be considered, and a cutter relief device is required to move both tools at each return process and turning process.In the case of a double cutter, installing each cutter relief device would result in a large size. It turns into

In order to reduce the size of cutter relief devices, various double cutter relief devices have been proposed.
For example, the double cylinder device shown in FIG.
There are a rack and pinion device shown in FIGS. 6 and 6, and a helical tooth rack device shown in FIG.

In the two-cylinder device shown in FIG.
31 are attached to the tool rests 32 and 3, respectively.
3 is attached to each of cylinder devices 36 and 37 which can move forward and backward in the directions of double arrows, which are perpendicular to the machining surfaces 34 and 35 of the workpiece 1. In this conventional example, the cylinder devices are 2
Because they are installed side by side, the overall shape of the double cut relief device becomes large, and the space required for installation is large, and the piping and wiring of the cylinder devices 36 and 37, solenoid valves for pressure oil switching, etc. Since two sets are required, the entire device is large and expensive, and because of its large size, it is suitable for inserting the workpiece 1 only from the outside. It was unsuitable for inserting.

In the rack and pinion device shown in FIGS. 5 and 6, blades 30 and 31 are respectively attached to both ends of a fork-shaped tool rest 38, and the said tool rest 38 is attached to the shaft end of a pinion 39, and The pinion 39 is rotatable left and right by moving forward and backward a rack 42 attached to a piston 41 of a cylinder device 40, and two sets of cylinder devices are provided for rotating the pinion 39. There are some.

In this conventional example, the cutter 3 for the workpiece 1
Since the configuration is such that the interval between the blades 30 and 31 is adjusted by rotating the tool post 38, the blades 30 and 3
The positioning adjustment for each workpiece 1 cannot be performed individually, and the distance between the two blades 30 and 31 is constant, so that the blades 30 and 31 escape from the workpiece 1.
Because the rotation of the tool post 38 is the only action, the tools 30, 3
It is unsuitable when the amount of movement of the workpiece 1 is small, and therefore the thickness of the workpiece 1 must be machined from time to time, and the thickness of the workpiece 1 changes greatly. There are various problems in that it is impossible to do so, requires gear cutting of the rack 42 and pinion 39, and the manufacturing cost of the device is high.

In the conventional example using the helical rack device shown in FIG. 7, a sleeve 47 in which a cylinder 46 is bored is installed in a body 45 so as to be movable in the axial direction. A rod 49 provided with a piston 48 that can move forward and backward.
is mounted so that it can move forward and backward in the axial direction, and tool rests 50 and 51 that can move forward and backward in the axial direction and diagonal direction are provided in parallel to each other, and the sleeve 47 and the tool rest 50 are engaged with each other by a helical rack 52. The rod 49 and the tool rest 51 are engaged with each other by a helical rack 51, and the tool rest 5 is connected by a single cylinder device 54 consisting of the cylinder 46 and the piston 48.
The position of the cutter 30 attached to the turret 0 and the cutter 31 attached to the turret 51 with respect to the workpiece 1 is adjusted, but since it uses Hasbarak, the mechanism is complicated and the shape of the parts is complicated. The gear cutting cost of Hasuba Raku is expensive, and the cutter is 30,3
1 cannot be adjusted individually, and the relief direction of the cutters 30 and 31 is diagonal to the machining surface of the workpiece 1. Therefore, depending on the shape of the workpiece 1, and the forward and backward directions of the cutters 30 and 31. There were various problems such as the device being unable to be used if there were interferences.

Means for Solving Problems The present invention is an invention of a clamping processing device that moves forward and backward by a piston built into a body, and the processing device is placed on a slider driven by an NC device,
By moving it forward and backward, it can be used as a double cutter relief device similar to the one described above.

In the present invention, a piston having a piston shaft passing through the cylinder is built into a cylinder of a body, and the piston shaft can slide back and forth between piston bushes attached to both ends of the cylinder without rotating. A piston-side clamping tool rest is attached to one end of the piston shaft, a body-side clamping tool rest is mounted to the body facing the piston-side clamping tool rest, and the piston shaft and other parts are mounted on the piston shaft. A rotary stopper is attached to the end so as to be rotatable around the axis, and a plurality of stopper pins of different lengths are arranged on the same radius from the axis on one of the opposing surfaces of the body and the rotary stopper in the axial direction. A stopper pin is provided on the other side of the opposing surface to protrude from the stopper pin and can face either of the stopper pins, and the stroke of the piston is regulated at a position where it abuts both the piston bushes, and the piston side clamping The forward position of the processing tool rest can be regulated by the contact position of the stopper pins on the opposing body side and piston side, and the rotation stop position of the rotary stopper can be detected by a proximity switch. To obtain a relatively small device capable of controlling the forward and backward stroke of one side of a clamping tool post, enabling simultaneous turning on both sides of workpieces of different thicknesses at a predetermined thickness, and preventing the occurrence of return marks. I was able to do that.

Effect By having the above-described configuration, the present invention makes it possible to control the advance and retreat strokes of one side of the clamping tool post in multiple stages, and to quickly maintain the clamping time at a predetermined interval, and to clamp workpieces with different clamping intervals. This makes it possible to deal with problems quickly.

As a result, it is possible to simultaneously machine two parallel surfaces and the inner and outer diameters of the clamped workpiece.In the return process, the piston cutter generates tool return marks due to the retreat of the piston, and the body cutter generates tool return marks due to the movement of the slider to which the body is attached. It can be used as a double cutter relief device without any damage.

Embodiments Hereinafter, the configuration of the present invention will be described with reference to embodiments shown in FIGS. 1 to 3.

A piston 2 having piston shafts 13, 13a passing through the cylinder 12 is built into the cylinder 12 of the body 1, and the piston shafts 13, 13a have piston bushes 3, 3a mounted on both ends of the cylinder 12, respectively. The piston 2 is installed as a guide so that it can slide back and forth without rotating in the axial direction, and the piston 2 can slide back and forth between the piston bushes 3 and 3a. A piston-side clamping tool rest 4 is attached to the tip of the piston shaft 13 on the left side in FIG. 1, and a body-side clamping tool rest 6 is attached to the body 1, facing the piston-side clamping tool rest 4. It is being A piston cutter 14 is mounted on the piston-side clamping tool rest 4, and a body cutter 15 is mounted on the body-side clamping tool rest 6, so that they can grip and process a workpiece 16.

One end of a guide bar 5 parallel to the piston shafts 13, 13a is screwed onto the piston-side clamping tool rest 4 with a nut 17, and the guide bar 5 is inserted into a guide bush 18 mounted on the body 1. The piston 2 is capable of sliding forward and backward, so the piston 2 does not rotate when moving forward and backward in the axial direction.

A rotary stopper 7 is mounted on the left end of the piston shaft 13a in the drawing so as to be rotatable around the axis with respect to the piston shaft 13a, and a rotary stopper 7 is mounted on the opposing surface of the body 1 and the rotary stopper 7 in the illustrated example. Rotary stopper pins 8, 8 of a fixed length are provided on the stopper 7 side, and a plurality of body stopper pins 9, 9 of different lengths are provided on the same radius from the axis on the body 1 side, projecting in the axial direction. Either the rotation stopper pin 8 or the body stopper pin 9 may face each other depending on the rotational position of the rotation stopper 7. In FIG. 3, four sets of body stop pins 9, 9 having different lengths 9a, 9b, 9c, and 9d are protruded from positions symmetrical to the axis, respectively. A set of rotary stopper pins 8, 8 that can directly face the body stopper pins 9, 9 is also provided protrudingly as shown in FIG.

The stroke of the piston 2 is regulated at the position where it abuts against both the piston bushes 3, 3a, and the forward position of the piston-side clamping tool rest 4 is controlled at the position where the body stop pin 9 and the rotary stop pin 8 abut against each other. The distance between the piston cutter 14 and the body cutter 15 can be selected by rotating the rotary stopper 7 in the same manner and directly facing the rotary stopper pin 8 to the body stopper pin 9 of the required length. becomes possible.

The stopper pins having different lengths may be provided on the rotary stopper 7 side, unlike the illustrated example.

The piston 2 moves forward and backward by alternately applying liquid pressure to oil passages 19 and 20 formed in the piston shaft 13a.

The rotational position of the rotary stopper 7 may be determined by installing a click stop device directly on the rotary stopper 7, but in the illustrated example, the rotational position of the rotary stopper 7 is determined by
installed in the example. A stopper side gear 21 is formed on the outer periphery of the rotation stopper 7, and the guide bar 5
A rotary dock 10 is attached to the end of the rotary stopper 7 side so as to be rotatable around the guide bar 5, and a dock side gear 22 is attached to the tip of the rotary dock 10, which is connected to the stopper side gear 21. It is meshed with the dock side gear 22.

As mentioned above, since the guide bar 5 is movable forward and backward together with the piston 2, the dock side gear 22 is also advanced and retracted together with the stopper side gear 21. Therefore, both gears 21 and 22 are always meshed, and as shown in FIGS. 3
As shown in the figure, when the rotation stopper 7 is rotated in the direction of arrow A, the rotation dock 10 is rotated in the direction of arrow B. Rotation of the rotating dock 10 is stopped at a predetermined angle using the click stopper 23 and click holes 24 (24a, 24b, 24c, 24d) shown in FIGS. 1 and 3.
The rotation stopper pin 8 is stopped at a matching position with one of the body stopper pins 9, and in this stop position, the rotation stopper pin 8 directly faces one of the body stopper pins 9. The detection of this facing position is carried out by the proximity switch 1 supported by the proximity pin 25 protruding from the rotary dock 10 and the support plate 26.
1 (11a, 11b, 11c, 11d) can be confirmed by the detection signal of the proximity switch 11.

By selecting the proximity position between the proximity pin 25 and a predetermined proximity switch 11, the clamping interval between the piston cutter 14 and the body cutter 15 can be selected.

FIG. 1 shows the retracted position of the piston 2, with fluid pressure being applied to the cylinder 12 through the oil passage 19. If the interval between the stopper pins 8 and 9 is determined in advance by rotating and indexing the rotary stopper 7 to an arbitrary rotational position at this position, the piston-side clamping tool rest 4 and the body can be fixed at the forward position of the piston 2. In the illustrated example, the distance from the side clamping processing tool rest 6 can be selected in four stages.

Blades 14 and 15 are mounted on the double turrets 4 and 6, respectively.
The slider 27 attached to the body 1 is simultaneously moved backward and forward according to the amount of movement of the piston 2 forward and backward, thereby simultaneously turning both sides of the workpiece 16 using the cutters 14 and 15 and returning the tool after turning is completed. This makes it possible to prevent the occurrence of marks.

Effects of the Invention As specified in the claims, the present invention incorporates a piston in a cylinder of a body, attaches one side of a clamping tool rest to the piston, allows it to move forward and backward, and rotates by rotating a rotation stopper. By selecting the combination of the stopper pin and the body stopper pin, it is possible to select the clamping interval between the clamping processing tool rests at the forward position of the piston, and only one cylinder is required, making the mechanism compact and reducing the overall size. The clamping device of the present invention is attached to a slider that advances and retreats under NC control.
By attaching a cutter to each turret and utilizing the forward and backward movement of the piston as well as the backward and forward movement of the slider, it can be used for simultaneous turning on both sides and the inner and outer diameters of workpieces that do not generate tool return marks. Moreover, even when the interval between the machined surfaces of the workpiece is changed, various effects can be achieved such that the number of stages can be changed quickly and accurately in accordance with the change in the clamping interval.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the cylinder axis of the embodiment, Fig. 2 is a side view of the rotary stopper side of the above, and Fig. 3 is a cross-sectional view of the cylinder axis of the embodiment.
4 is a side view showing a partial cross section of a conventional example using a two-cylinder device, FIG. 5 is an elevational sectional view of a conventional example using a rack and pinion device, and FIG. 6 is a sectional view from the upper side of the same. FIG. 7 is a partially sectional side view of a conventional example of a Hasbarak device. 1: Body, 2: Piston, 3, 3a: Piston bush, 4: Piston side clamping tool rest, 6: Body side clamping tool rest, 7: Rotating stopper, 8: Rotating stopper pin, 9: Body stopper pin, 11
(11a, 11b, 11c, 11d): proximity switch, 12: cylinder, 13, 13a: piston shaft.

Claims (1)

[Claims] 1 A piston having a piston shaft passing through the cylinder is built into the cylinder of the body, and the piston shaft is installed so as to be able to slide back and forth without rotation between piston bushes installed at both ends of the cylinder, A piston-side clamping tool rest is attached to one end of the piston shaft, a body-side clamping tool rest is mounted to the body so as to face the piston-side clamping tool rest, and the other end of the piston shaft includes a clamping tool rest. A rotary stopper is mounted so as to be rotatable around an axis, and a plurality of stopper pins of different lengths are provided on one of the facing surfaces of the body and the rotary stopper on the same radius from the axis and protrude in the axial direction. A stopper pin that can face either of the stopper pins is protrudingly provided on the other of the opposing surfaces, the stroke of the piston is regulated at a position where it abuts both the piston bushes, and the piston-side clamping tool rest is provided. The forward position of the rotary stopper can be regulated by a contact position of the stopper pins on the body side and the piston side that face each other, and the rotation stop position of the rotary stopper can be detected by a proximity switch. Device.