JP5070096B2 - Work discharge device and machine tool equipped with work discharge device - Google Patents

Description

  The present invention relates to a workpiece discharge device and a machine tool including the workpiece discharge device.

2. Description of the Related Art Conventionally, a pressing rod that comes into contact with an end portion of a workpiece and a container that is slidably mounted on the pressing rod so as to accommodate the end portion of the workpiece are provided. A workpiece discharge device is known in which the workpiece is released from the main body, and is pushed out by the push rod from the container by the slide of the push rod against the container (see, for example, Patent Document 1). .
Since the workpiece discharge device accommodates the end portion of the workpiece in the container (work carrier), the pushing rod (work pushing sleeve) does not come off from the end portion of the workpiece and prevents the workpiece from being pushed out and discharged. be able to.
Japanese Utility Model Publication No. 61-102449

  However, since the workpiece discharging device is disposed outside the main shaft, a relatively large support mechanism for moving the push rod with respect to the container is required, and it is easy to store the work in the main shaft. Can not. For this reason, there has been a drawback that it is not easy to employ the workpiece discharge device as a workpiece discharge device that pushes and discharges the workpiece from the main shaft after machining.

  The work discharging apparatus of the present invention for solving the above-described problem is attached to the push rod 8 that contacts the end portion of the work W, and to the push rod 8 so as to be slidable so as to accommodate the end portion of the work W. In a workpiece discharge device that pushes and discharges the workpiece W from the housing 9 by the push rod 8 by moving the push rod 8 with respect to the storage body 9 in the main shaft 1 that grips the workpiece W. The push rod 8 and the housing body 9 are arranged, and the push rod 8 and the housing body 9 are directed toward the tip of the main shaft 1 in a state where the end portion in the main shaft 1 of the work W whose grip is released is housed in the housing body 9. So that the container 9 is elastically positioned on the front end side of the push rod 8, and the container 9 is moved in the middle of the integral movement of the push rod 8 and the container 9. Abut, restrict the movement of the container 9 and move the pusher 8 The regulating portion for contents provided in the spindle 1, the first feature to be discharged extruding the workpiece W to the outside of the spindle 1 by the movement of the housing body 9 and after contact with the restricting portion pressing rod 8.

  Secondly, the spindle 1 includes a collet chuck 2 for gripping the workpiece W, and the restricting portion includes an inner peripheral end face 2 a of the collet chuck 2.

  Thirdly, the push rod 8 is provided with a retaining portion 8 a that contacts the inside of the end surface of the container 9 and restricts the drop of the container 9 from the push rod 8, and the container is interposed between the push rod 8 and the container 9. An urging member 11 is provided to press and position 9 to the retaining portion 8a.

  Moreover, the machine tool provided with the workpiece discharge apparatus of this invention was equipped with the workpiece discharge apparatus described in any one of Claims 1-3.

According to the configuration of the present invention configured as described above, the end of the workpiece can be accommodated in the container within the main shaft, and the workpiece can be pushed out by the pushing rod. This is advantageous in that the work can be stably discharged even in the case of a small-diameter work.

  Further, the main shaft includes a collet chuck for gripping a workpiece, and the restriction portion is configured from the end surface on the inner peripheral side of the collet chuck, so that there is an advantage that it is not necessary to provide the restriction portion in the main shaft.

  The push rod is provided with a retaining portion that contacts the inner side of the end surface of the container and restricts the falling of the container from the push rod, and the container is positioned between the push rod and the container by pressing against the retaining portion. By interposing the urging member, the pressing rod moves against the urging force after the container and the restricting portion come into contact with each other, and the workpiece is discharged. With the return, the container can be automatically returned to the position so as to be pressed against the retaining portion by the urging force, and the pushing operation of the workpiece can be continued smoothly.

  As shown in FIG. 1, a collet chuck 2 that grips a workpiece W is provided at the tip of a spindle 1 of a machine tool. The collet chuck 2 is accommodated in a chuck sleeve 3 slidably provided in the main shaft 1. The collet chuck 2 is opened and closed by movement along the spindle axis C of the chuck sleeve 3.

  By closing the collet chuck 2 by the forward movement of the chuck sleeve 3, the workpiece W is gripped by the spindle 1. The gripping of the workpiece W is released by opening the collet chuck 2 by the backward movement of the chuck sleeve 3. The spindle 1 is driven to rotate while gripping the workpiece W. A portion of the workpiece W protruding from the spindle 1 is machined by a machining tool (not shown) by the rotational drive of the spindle 1.

  A workpiece discharge device 4 is provided on the rear side of the collet chuck 2. The workpiece discharging device 4 is attached to the pushing pin 8, a moving rod 6 that moves forward and backward in the direction of the spindle axis C, an extrusion pin 8 that is integrally provided at the tip of the moving rod 6 via a joint 7. The guide holder 9 is provided. The movable rod 6, the joint 7, the push pin 8, and the guide holder 9 are accommodated in the main shaft 1.

  The guide holder 9 has a cylindrical shape with an opening on the workpiece W side, and is slidably inserted into the push pin 8 through a hole formed in the center portion of the end surface. The distal end side of the extrusion pin 8 is formed to have a larger diameter than the insertion portion into the hole of the guide holder 9. The large-diameter portion of the push pin 8 is located in the guide holder 9 and constitutes a retaining portion 8a that regulates the drop of the guide holder 9 from the push pin 8.

  A compression spring 11 is interposed between the guide holder 9 and the joint 7 so as to be fitted around the push pin 8. The compression spring 11 biases the guide holder 9 toward the workpiece W, and is elastically positioned on the distal end side of the push pin 8 so that the end surface of the guide holder 9 is pressed against the retaining portion 8a. The guide holder 9 and the push pin 8 are moved together by the movement of the moving rod 6.

  The end of the workpiece W in the main shaft 1 is accommodated in the guide holder 9 by the movement of the movable rod 6 in the distal direction of the main shaft 1. The guide holder 9 is formed so that the tip surface of the guide holder 9 comes into contact with the inner peripheral end surface (inner end surface) 2a of the collet chuck 2 from which the gripping of the workpiece W is released by the movement of the main shaft 1 in the distal direction. ing. In addition, since the moving mechanism of the moving rod 6 is conventionally well-known, description is omitted.

  The workpiece discharge device 4 positions the moving rod 6 so that the guide holder 9 is separated from the end portion of the workpiece W in the main shaft 1 during the processing of the workpiece W. After the processing of the workpiece W is finished, as shown in FIG. 2A, the end of the workpiece W is accommodated in the guide holder 9 by the movement of the movable rod 6 in the workpiece W direction. And the retaining portion 8a of the push pin 8 come into contact with each other.

  Since the grip of the workpiece W by the collet chuck 2 is released, as shown in FIG. 2 (B), after the end portion of the workpiece W comes into contact with the push pin 8 (prevention portion 8a), the moving rod 6, the workpiece W moves toward the outside of the main shaft 1. During the movement of the workpiece W, as shown in FIG. 2C, the tip end surface of the guide holder 9 comes into contact with the inner end surface 2a of the collet chuck 2, and the movement of the guide holder 9 is restricted.

  However, since the push pin 8 is set to a size that passes through the collet chuck 2 from which the workpiece W is released, the movement is permitted even after the movement of the guide holder 9 is restricted as described above. Thereby, after the movement of the guide holder 9 is restricted, the push pin 8 moves so as to protrude from the guide holder 9 against the urging force of the compression spring 11 as shown in FIG. . Since the workpiece W is in contact with the extrusion pin 8, it moves integrally with the extrusion pin 8, is pushed out of the collet chuck 2 by the extrusion pin 8, and is discharged from the main shaft 1.

  When the moving rod 6 is moved rearward of the main shaft 1 after the discharge of the workpiece W, the push pin 8 moves backward integrally with the moving rod 6 until the retaining portion 8 a comes into contact with the guide holder 9. After the contact between the retaining portion 8a and the guide holder 9, the guide holder 9 is automatically positioned at the tip of the push pin 8 by the urging force of the compression spring 11, and the push pin 8 and the guide holder 9 are retracted integrally. Move and return to the initial position.

  When the workpiece discharge device 4 discharges the workpiece W from the main shaft 1 as described above, the end portion of the workpiece W can be accommodated in the guide holder 9 in the main shaft 1. The work W can be discharged from the main shaft 1 while preventing the end portion from coming off. As described above, since the disengagement between the push pin 8 and the end portion of the workpiece W is prevented, it is possible to prevent the workpiece W from being pushed out, and in particular, smoothly and stably discharging the small-diameter workpiece. Can do.

  In the present embodiment, the end surface 2a on the inner peripheral side of the collet chuck 2 abuts on the guide holder 9 during the integral movement of the guide holder 9 and the pushing pin 8, restricts the movement of the guide holder 9, and pushes out. A restricting portion in the main shaft 1 that allows the movement of the pin 8 is configured. As a result, the restriction portion does not need to be provided in the main shaft 1 and the end of the work W can be accommodated near the tip of the main shaft 1, so that the work W can be smoothly and stably moved to the vicinity of the tip of the main shaft 1. And can guide the movement.

  However, a member provided with a hole, a slit, or the like that is in contact with the end surface of the guide holder 9 and allows the movement of the workpiece W and the push pin 8 is inserted into the main shaft 1 as a restricting portion, or the guide holder in the main shaft 1 is provided. A stopper may be provided integrally or separately from the main shaft 1 at a position where only 9 is in contact with the main shaft 1 to be a restricting portion.

  In the present embodiment, since the end portion of the workpiece W in the main shaft 1 has a tapering shape, the end portion of the workpiece W is positioned at the end portion of the retaining portion 8a as shown in FIG. A tapered receiver 12 that can accommodate the portion is formed. As a result, the push pin 8 comes into contact with the work W so that at least a part of the end of the work W is received by the receiver 12, and the contact between the push pin 8 and the work W is stabilized.

  In the embodiment, the end portion of the workpiece W is not accommodated in the guide holder 9 during the processing of the workpiece W, but the end portion of the workpiece W is accommodated in the guide holder 9 as shown in FIG. In addition, the workpiece W can be processed by rotating the spindle 1. As a result, the workpiece 1 can be prevented from being shaken during machining of the workpiece W, and the workpiece W can be machined at high speed and with high accuracy.

  Since the workpiece W is in contact with the extrusion pin 8 so that at least a part of the tapered end portion is accommodated in the receiver 12, the workpiece W is stably supported by the extrusion pin 8, and between the extrusion pin 8. Rotation during machining is allowed smoothly without causing excessive frictional resistance. However, the guide holder 9 may be rotated integrally with the workpiece W, or the guide holder 9 may be a metal bearing for the workpiece W.

It is principal part side sectional drawing of the main axis | shaft of a machine tool. (A) is a main part side view showing a state in which the end portion of the work is accommodated in the guide holder, (B) is a main part side view showing a state in which the work is being discharged by the work discharge device, and (C) is The principal part side view which shows the state which the guide holder contact | abutted to the end surface of the collet chuck, (D) is a principal part side view which shows the discharge | emission state of the workpiece | work by a workpiece | work discharge apparatus. It is a principal part expanded side view which shows the contact part with the workpiece | work of an extrusion pin. It is principal part side sectional drawing of the main axis | shaft which shows the processing state in the state which accommodated the edge part of the workpiece | work in the guide holder.

Explanation of symbols

1 Spindle 2 Collet Chuck 2a Collet Chuck Inner End Face 9 Guide Holder (Container)
8 Extrusion pin
8a retaining part 11 compression spring (biasing member)
W Work

Claims (4)

A push rod (8) that contacts the end of the workpiece (W), and a container (9) that is slidably mounted on the push rod (8) so as to accommodate the end of the workpiece (W). With
In the workpiece discharge device that pushes and discharges the workpiece (W) from the container (9) by the push rod (8) by moving the push rod (8) relative to the container (9),
A push rod (8) and a container (9) are arranged in the main shaft (1) for gripping the workpiece (W),
With the end in the main shaft (1) of the workpiece (W) released from gripping being accommodated in the housing (9), the push rod (8) and the housing (9) are at the tip of the main shaft (1). The container (9) is elastically positioned on the distal end side of the push rod (8) so as to integrally slide toward
In the middle of the integral movement of the push bar (8) and the container (9), it comes into contact with the container (9), restricts the movement of the container (9), and moves the push bar (8). An allowable restriction portion is provided in the main shaft (1),
A workpiece discharging device that pushes and discharges the workpiece (W) to the outside of the main shaft (1) by the movement of the pressing rod (8) after the container (9) and the restricting portion come into contact with each other.   The work discharging apparatus according to claim 1, wherein the main shaft (1) includes a collet chuck (2) for gripping the work (W), and the restricting portion includes an end surface (2a) on the inner peripheral side of the collet chuck (2).   The push rod (8) is provided with a retaining portion (8a) that comes into contact with the inside of the end face of the container (9) and regulates the drop of the container (9) from the push rod (8). The work discharging apparatus according to claim 1 or 2, wherein an urging member (11) is provided between the body (9) and the container (9) for pressing and positioning the container (9) against the retaining portion (8a).   A machine tool comprising the workpiece discharge device according to any one of claims 1 to 3.

Images