JPH0135794Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a device for holding a workpiece (workpiece) at a processing location, and in particular, a device for holding a workpiece to be processed from both ends in the axial direction. It is related to.

Prior Art For example, when manufacturing a workpiece 1 having the shape shown in FIG. 4, processing of center holes 2 and 3 on both end faces of the workpiece 1 has conventionally been carried out using a device having the configuration shown in FIG. Ta. That is, a shuttle slide 6 that is reciprocated by a shuttle hydraulic cylinder 5 in a direction parallel to the radial direction of the work 1 is arranged on the table 7 at the rear end side of the work 1 set on the reference surface 4. A hydraulic cylinder 9 for backup and positioning having a stopper 8 at its tip and a hole machining tool 10 are attached to the shuttle slide 6 in a direction parallel to the axial direction of the work 1. There is. Further, on the front end side of the workpiece 1, a drill 11 for drilling a pilot hole and another drilling tool 12 are arranged so as to be movable in parallel so as to be positioned on the same axis as the workpiece 1. The device shown in FIG. 5 advances the stopper 8 by the hydraulic cylinder 9, presses the workpiece 1 against the reference surface 4, and positions it in the axial direction, as shown in FIG. 13 grips the workpiece 1, the hydraulic cylinder 9 backs up the cutting load when drilling a pilot hole with the drill 11, and after completion of such pilot hole drilling, the pad 8 is retreated, The slide 6 is moved by a shuttle hydraulic cylinder 5, the hole machining tools 10 and 12 are positioned on the same axis as the workpiece 1, and center holes 2 and 3 at both ends are machined.

Problems to be Solved by the Invention However, in the conventional device described above, the cutting load F acting in the axial direction is counteracted by the hydraulic cylinder 9 disposed on the same axis on the rear end side of the workpiece 1. Therefore, as the cutting load increases, the size of the hydraulic cylinder has to be increased.For example, when a cutting load of about 1100 kg is generated,
A hydraulic cylinder with a piston diameter of approximately 70 mm was required for the hydraulic pressure of Kg/cm ² , which resulted in the problem of requiring a large jig space. Furthermore, in the conventional device, when drilling a hole from the side of the hydraulic cylinder 9 that resists the cutting load, it is necessary to temporarily retreat the hydraulic cylinder 9 to a position where it does not interfere with the drilling tool 10. It is necessary to provide control devices such as slide mechanisms, actuators, hydraulic pumps, hydraulic tanks, and even solenoid valves such as the table 7 or the shuttle hydraulic cylinder 5, resulting in the problem that the entire device becomes complicated and large. As described above, conventional devices require a large space and have the problem of increasing equipment costs.

In view of the above-mentioned circumstances, this invention aims to provide a workpiece holding device that can make the equipment more compact.

Means for Solving the Problems In order to achieve the above purpose, this invention applies a so-called back-up force to the workpiece to counter the cutting load simultaneously with the workpiece holding operation, and simultaneously with the workpiece release operation. The workpiece is retracted from the end face, and a link mechanism is used to generate a sufficiently large back-up force. More specifically, this invention involves inserting a swing arm that moves back and forth in the radial direction of a workpiece that is pressed against a reference surface in the axial direction into a guide holder, and A first inclined guide surface which is inclined with respect to the longitudinal movement direction of the swing arm is formed on one of the side surface and the corresponding inner surface of the guide holder, and the inclined guide surface is brought into sliding contact with the other side. A second protrusion is formed on the tip side of the inclined guide surface and the first protrusion, and on either the other side surface of the swing arm or the corresponding inner surface of the guide holder. The present invention is characterized in that a stopper is provided on one side of the tip of the swing arm to abut against the end surface of the workpiece in the axial direction.

Function: Therefore, in this invention, when holding a workpiece, the workpiece is set in a desired posture on the reference plane, and the swing arm is moved forward in that state. As the swing arm moves forward, the first protrusion comes into contact with the corresponding inclined guide surface, so that the base end of the swing arm receives a force in a direction perpendicular to the longitudinal direction. The second protrusion receives a reaction force from the opposite direction, and the swing arm rotates so that the stopper provided on one side of the tip of the swing arm faces the end surface of the workpiece set on the reference surface, and the swing arm is levered. Acts as. As a result, the workpiece is pressed and fixed to the reference surface. When cutting in the axial direction from the other end of the workpiece in this state, force is applied to the tip of the swing arm, which acts as a rotational moment on the swing arm. Since the protrusion serves as a fulcrum and the first protrusion on the proximal end side acts as a lever, the cutting load is supported by the guide holder via the swing arm. In that case, since the inclined guide surface is used, a force is generated that moves the swing arm backward, but this is because it acts as a component of the total load generated during cutting through the inclined guide surface. , becomes a small force. On the other hand, workpiece holding is released by retracting the swing arm. In other words, when the swing arm is moved backward, the force to rotate the swing arm is no longer generated by the respective protrusions and the inclined guide surface, so that the workpiece is released from being held by the force that presses it toward the reference surface, and at the same time The tip of the swing arm is retracted from the end surface of the workpiece in the radial direction, and the end surface of the workpiece can be machined.

Embodiments Hereinafter, embodiments of this invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a schematic cross-sectional view showing an embodiment of this invention, in which a reference surface 20 is configured to insert a workpiece 1 and position it in the axial direction, and the workpiece 1 set on the reference surface 20 is A swing arm 21 that moves back and forth in the radial direction of the workpiece 1 is inserted into a guide holder 22 and arranged on the rear end surface side. The swing arm 21 is a shaft-like member with a rectangular cross section, and a first inclined guide surface 23 is formed on one side of its base end (the right side of the lower end in FIG. 1), which is inclined diagonally upward to the left in the figure. , and on the other side (left side in Figure 1) on the tip side.
A second inclined guide surface 24 is formed which is inclined in the opposite direction to the inclined guide surface 23, and the workpiece 1 is further formed at the tip of the same side as the first inclined guide surface 23.
A stopper 25 that presses the workpiece 1 by coming into contact with the end face of the workpiece 1 is provided. On the other hand, the guide holder 22
A first protrusion 26 that makes sliding contact with the first inclined guide surface 23 is provided on the inner surface corresponding to the first inclined guide surface 23 at the lower end of the , protruding toward the swing arm 21;
Further, on the inner surface corresponding to the second inclined guide surface 24 on the distal end side, a second protrusion 27 is provided to protrude toward the swing arm 21 and bring the second inclined guide surface 24 into sliding contact. Further, a guide roller 28 is provided at the lower end of the guide holder 22 and guides the swing arm 21 by sandwiching it between the guide roller 28 and the first protrusion 26 .

A hydraulic cylinder 29 for moving the swing arm 21 back and forth is arranged behind the swing arm 21 (lower in the figure), and the rod 30 of the hydraulic cylinder 29 and the base end of the swing arm 21 are connected to the swing arm 21. The rod 30 is connected via a pin 31 and a horizontally elongated hole 32 in order to allow some movement in the left and right direction and to prevent bending loads from acting on the rod 30. .

In addition, the reference numeral 33 in FIG. 1 indicates the swing arm 21.
34 indicates a pin provided on the guide holder 22 to engage with the vertical groove 33, and 35 indicates a V bevel for gripping the workpiece 1.

Next, the operation of the apparatus configured as described above will be explained. When holding the workpiece 1 at a processing location, the workpiece 1 is inserted and set on the reference surface 20, and then the hydraulic cylinder 29 is operated to move the swing arm 21 forward. swing arm 21
is guided upward by the longitudinal groove 33 and pin 34, but when the first inclined guide surface 23 contacts the first protrusion 26, the base end is pushed to the left in FIG. When the second inclined guide surface 24 comes into contact with the second protrusion 27, that part becomes the first inclined guide surface 24.
The swing arm 21 is pushed to the right in the figure, and as a result, the swing arm 21 receives a clockwise rotational force while moving forward.
As a result, when the forward movement end is almost reached, the stopper 2
5 comes into contact with the rear end surface of the workpiece 1, and presses and holds the workpiece 1 against the reference surface 20. Next, after the workpiece 1 is clamped by the V bevel 35, a pilot hole is drilled on the tip surface of the workpiece 1 by the drill 36. In that case, a large cutting load F (approximately 1100 kg for a prepared hole of 35 mm in diameter) is applied to the workpiece 1 in the axial direction, and this is applied to the swing arm 2.
However, as shown in FIG. 2, the swing arm 21 is supported at two points, the first protrusion 26 and the second protrusion 27.
Acts as a lever with the second protrusion 27 as a fulcrum and the first protrusion 26 as a point of action,
Therefore, the cutting load F is
It is supported by the guide holder 22 via 6 and 27. In that case, since each of the inclined guide surfaces 23 and 24 is in contact with each of the protrusions 26 and 27, a force is applied in the longitudinal direction of the swing arm 21 based on the reaction force at each of the protrusions 26 and 27. However, the force becomes small depending on the angle of the inclined guide surfaces 23 and 24, and therefore, even if the hydraulic cylinder 29 is made small, it can be sufficiently counteracted.
In other words, the workpiece 1 can be sufficiently backed up by a small actuator such as the hydraulic cylinder 29.

After drilling a pilot hole on the tip end face of the workpiece 1 and prior to drilling holes on both end faces, the holding of the workpiece 1 by the swing arm 21 is released. This can be done by simply pulling the swing arm 21 back to the position shown in FIG. 3 using the hydraulic cylinder 29. In this way, the swing arm 21 is The rotational force is no longer applied to the workpiece 1, and the swing arm 21 is guided by the vertical groove 33, the pin 34, and the guide roller 28 and moves away from the workpiece 1 in the radial direction. That is, the swing arm 21 releases the pressing fixation of the work 1 to the reference surface 20 and at the same time retreats from the rear end surface of the work 1 to be drilled. Therefore, in the above device, the drill 3
6 and replace it with another hole machining tool 37,
At the same time, by placing another tool 38 on the rear end surface side of the workpiece 1, the workpiece 1 can be set as before and hole machining can be performed.

In the above embodiment, the first and second inclined guide surfaces 23 and 24 were provided, but since it is sufficient to generate rotational force along with linear motion with this invention, at least the inclined guide surface on the base end side is provided. Any structure provided with a surface may be used. Also, in this invention, instead of forming an inclined guide surface on the swing arm and a protrusion on the guide holder, a structure is adopted in which an inclined guide surface is formed on the guide holder and a corresponding protrusion is formed on the swing arm. Good too.

Effects of the invention As is clear from the above explanation, according to the device of this invention, by moving the swing arm forward, the swing arm acts as a lever, converting linear force into rotational force and pressing the workpiece against the reference surface. Since the structure is fixed and backs up against the cutting load, most of the cutting load is applied to the guide holder that uses the swing arm as a lever, so the actuator that moves the swing arm back and forth must be small. be able to. In addition, by retracting the swing arm to release the hold on the workpiece, the swing arm can be retracted from the end face of the workpiece to be drilled in the radial direction of the workpiece. As a result, the actuator can be made smaller and the equipment can be made more compact.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view showing one embodiment of this invention, Fig. 2 is an explanatory drawing explaining that the swing arm acts as a lever, Fig. 3 is an overall layout diagram with the swing arm in a retracted state, FIG. 4 is a cross-sectional view of a workpiece, FIG. 5 is a schematic illustration of a conventional device, and FIG. 6 is a partial view of the conventional device machining a pilot hole. 1... Workpiece, 2, 3... Center hole, 20...
... Reference plane, 21 ... Swing arm, 22 ... Guide holder, 23 ... First inclined guide surface, 24
...Second inclined guide surface, 25...Batch, 26...
...first protrusion, 27...second protrusion.

Claims (1)

[Scope of utility model registration request] The swing arm moves back and forth in the radial direction of the workpiece that is pressed against the reference surface in the axial direction.
The guide holder is inserted through the guide holder, and an inclined guide surface that is inclined with respect to the longitudinal movement direction of the swing arm is formed on one side of the proximal end of the swing arm and the corresponding inner surface of the guide holder. At the same time, a first protrusion is formed on the other side to which the inclined guide surface slides, and a first protrusion is formed on the tip side of the inclined guide surface and the first protrusion and corresponds to the other side surface of the swing arm. A second protrusion is formed on one side of the inner surface of the guide holder, and a stopper is provided on one side of the tip of the swing arm to abut against the end surface of the workpiece in the axial direction. A work holding device characterized by: