JPS59196150A - Work positioning device - Google Patents

Abstract

PURPOSE:To expedite the positioning operation of a work as well as to improve productivity in metalworking, by providing both fixed and movable knock pins, which are engaged or disengaged to or from a pair of knock holes for positioning reference use to be installed in a square blockish work, and a transfer device or the like. CONSTITUTION:A pair of knock holes are formed in a work W to be mounted on a seat pat 2 of a positioning device body 1, while a fixed main knock pin 3 and a movable auxiliary knock pin 4 are set up at one side of the device body 1 corresponding to each knock hole. Also, a pilot bar 6 is installed at the side of the device body 1 along a transfer direction TR, and a movable block 5 to be transferred through a screwing of a feed screw and a nut rotated by a servo motor 7 is slidably installed in the pilot bar 6, while the knock pin 4 is retractably installed in the said block 5. In addition, a transfer device inclusive of a transfer bar 35 doing reciprocating motion in the transfer direction TR by means of a cylinder 36 and a turning arm 44 rotated by a cylinder 42 and going up and down along the said var 35 is provided for this positioning device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a positioning device for a box-shaped workpiece such as an engine block for an automobile.

(Prior art) There are many types of cylinder blocks for Mekinsha engines, depending on the engine model, and the position and pitch of the pair of dowel holes, which serve as positioning standards during machining, also depend on the dogness and shape of the cylinder block. It is not constant because it varies. For this reason, when machining several types of cylinder blocks on a common machining line, it is necessary to manually change the position of the knock pin that positions each workpiece.
It is necessary to replace the knock bottle 7, which has an impact on productivity improvement.

In addition, there is a known device in which both the main and sub-knock bottles are moved manually by a feed screw shaft, but in this case, there are many guide parts below the workpiece, making it difficult to remove chips. In addition, since all knock bottles including the main knock bottle moved, the reliability of positioning viscosity was at stake.

(Object of the Invention) In view of the above-mentioned conventional problems, the present invention automatically changes the position of the knock bin in response to various workpieces, and moves only the sub-knock bin to efficiently and accurately position the workpiece. This is what I decided to do.

(Structure of the Invention) The present invention provides a fixed main dowel bin that engages and disengages from one of a pair of dowel holes that serve as positioning references provided in a rectangular block-shaped workpiece, and a movable dowel bin that engages and disengages from the other dowel hole. A side dowel bin should be provided, and this side sub knock bin Z should be made to correspond to the other dowel hole position based on the type of workpiece (it should be movable by a moving device, and the transfer device for transporting the workpiece should be set according to the type of workpiece). It is equipped with a transfer device that can change the position of the robot and transport it to a different location.

Furthermore, in addition to the above configuration, the present invention includes a workpiece shift device that pushes the workpiece in a direction perpendicular to the direction of the transfer car;
A stopper was installed to restrict the pushed workpiece to a fixed position.

(Example) Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, 1 is a positioning device main body (hereinafter referred to as the device main body). Further, the arrow mark indicates the transfer direction of a rectangular block-shaped workpiece W that is transported by a transfer device that will be described later.

The workpiece WK is provided with a pair of dowel holes that serve as positioning references. Reference numeral 2 denotes nuts protruding from four locations on the upper surface of the apparatus main body 1, on which the workpiece W is placed.

A car is arranged in the -I11 direction of the transfer direction TR of the device main body 1, with a fixed raw knock bottle 3 that engages and disengages from one of the pair of dowel holes, and a movable knock bin 4 that engages and disengages from the other dowel hole. ing. This movable dowel bin 4 can be shifted by a moving device to correspond to different dowel hole positions depending on the type of workpieces W1 and W2.The moving device is shown in FIG. As shown in FIG. 4, a shaft with an axis parallel to the transfer direction 1 m is provided on the side of the device main body 1, and the movable block 5 is slidably guided thereto.

The movable block 5 is configured to be fed and moved by a feed screw 8 that is rotated forward and backward by a servo motor, and a nut member 9 that is screwed into the σ-shaped feed screw 8 and fixed to the movable block 5. Such a movable block 5
In this case, the self-movable knock pin 811 is provided so that it can be retracted and engaged with the knock hole of another force. The mechanism for moving the knock bottle 4 on the movable side to move in and out is a shaft 4 that is slidably held.
Install rack 13 on α, mesh with binion 12Y,
It has a structure in which the shaft 4cz7 moves forward and backward by forward and reverse rotation of the pinion 12. Note that the mechanism for moving the fixed main knock bin 3 in and out is the same as that described above, and in this embodiment, a pinion 12 is provided on the interlocking shaft 11 that rotates forward and backward by one actuator 10, and the fixed main knock bin 3 and the movable knock bin 4 are connected to each other. The appearance and appearance operation 7 will be performed in synchronization with
Ru.

Further, the present invention includes a transfer device whose position can be changed to transport the workpiece W carried in by the transfer device to a fixed position in the transfer direction 'M(/) according to different workpieces W1 and W2.

Its configuration will be explained with reference to FIG. 5 and part of FIG. 2.

Transfer cylinder direction T
RK reciprocating transformer 7 aver, this transformer fan <-35Y, the rotating arm 44 to move up and down, the rotating arm 44 to be connected to the cylinder 42 and this cylinder 42, and the rotating arm 44 The connecting rod 43 is pivotally connected at one end. 45
is a support roller provided at the upper end of the rotating arm 44, which abuts and supports the lower surface of the transfer bar. Support blocks 37 for the workpiece W are provided on the upper surface of the transfer bar 35 at regular intervals. This support block 37 has a flang arm 40 and a flang arm 4 that clamp the workpiece W'' between the guide block north of the workpiece W, the fixed block 39, and the fixed block 39.
A cylinder 417a for a clamp that operates automatically is provided.

Further, the transfer cylinder 36 is connected to a movable base 50.
is installed on top. A nut member 51 is fixed to the lower surface of the movable table 5o, and a nut member 51 is fixed to the lower surface of the movable table 5o, and a nut member 51 is fixed to the lower surface of the movable table 5o.
A feed screw 53 on the R axis is screwed together. Feed screw 53
One end is connected to a servo motor 52 that rotates in forward and reverse directions. Therefore, by controlling the servo motor 52, the movable base 50 is moved forward and backward, thereby moving the transfer cylinder 3.
6, the position of the workpiece W on the transfer bar 35 that moves forward and backward is changed in the transfer direction TR to be transferred onto the apparatus main body 1.

The present invention is provided with a workpiece shift device U that pushes the workpiece in a direction perpendicular to the workpiece transfer direction TR, and a stopper 232, (3) that restricts the main product being pushed in a fixed position.

As shown in FIGS. 1 and 2, the workpiece shift device row is installed at a substantially intermediate location between the stationary knock bin 3 and the movable knock bin 4 of the device main body 1. Its structure is such that the device main body IK bevel crank-shaped rotating lever 25 is rotatably supported around the heat transfer direction TR1v axis, one end of which can come into contact with the side surface of the workpiece W, and the other end connected to the cylinder. This is what I did.

As shown in FIG. 1, the stoppers 28a and 28b are installed in the apparatus main body 1 facing the workpiece shift apparatus row. The structure will be explained with reference to Figure 2, using the stopper nose as a representative. A stopper shaft 29 is provided on a mounting block 32 fixed to the apparatus main body IK so as to be movable forward and backward in a horizontal axis direction perpendicular to the transfer direction TR, and a movable shaft 30 is provided movable in a vertical axis direction intersecting the stopper shafts.

The stopper axial force and the movable axes are brought into contact with each other by the inclined cam 31 at the intersection thereof, and a vertical axis movement between the movable axes is converted into a horizontal axis movement and transmitted to the missing stopper axis 4. A feed screw M, which is rotated forward and backward by a servo motor 33Vc, is screwed onto the movable shaft 30, so that the movable shaft 30 is moved forward and backward in the vertical axis direction. Therefore, servo motor 3
3, the position of the stopper shaft 29 is changed.

Next, the operation of the present invention will be explained. The workpiece carried onto the device main body 1 is at the center position P during transportation and processing.
1, and the workpiece W2, whose center position during transportation is P2 and whose center position during machining is P2'.
In the case of a seed, the servo moke 52 is set to change the position of the transfer cylinder so that the workpiece W1 is transferred onto the apparatus main body 1 at the center position P1 and the workpiece W2 is transferred onto the apparatus main body 1 at the center position P2. Further, the position of the movable dowel bin 4 is also shifted to correspond to the dowel hole pitch of the workpieces W1 and W2, and the transfer device is moved forward.

When the workpiece to be transported is Wl, the center position for both transport and processing is Pl, and the transported workpiece W is positioned at the center position P1. Therefore, after the transfer device 'l is lowered, the fixed king knock pin 3 and the movable side knock pin 4 are immediately engaged with the knock holes of the workpiece W1, the jig is tightened, and the machining cycle begins.

In the case of the workpiece W2, shift the position of the movable dowel pin 4 to correspond to the pitch of the dowel holes of the workpiece W2. Further, the stopper shaft 29 of the stopper nose 28h is positioned at a predetermined position so that the workpiece stem is located at the center position P2' during machining. Then, the workpiece W2Y transported by the transfer device at the center position P2, the workpiece shift device U
The rotation of the workpiece W2 is pushed by the rotation lever 5 and regulated by the stopper nose 28h, and the center position P2 when machining the workpiece W2.
'. Thereafter, as described above, the fixed main knock pin 3 and the movable knock pin 4 are engaged with the knock holes, the jig is tightened, and the machining cycle begins. After the machining is completed, the workpiece W2 is returned to the transport center by the stopper base α, 28b, and then the workpiece W2 is transported.

(Effects) As described above, according to the device of the present invention, the transfer device changes the fixed position of the workpiece in the direction of the transfer car to be transferred onto the device main body according to the type of the workpiece. A stopper that defines the center position during machining and a device that shifts the workpiece in a direction perpendicular to the transfer direction are used to position the workpiece. Even if different workpieces are brought in at random, the workpieces can be positioned quickly and productivity is improved, and the knockbins can be shifted only between the main and sub knockbins. It has the advantage of high reliability because it is curved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the present invention, FIG. 2 is an enlarged sectional view taken along the line ■-■ in FIG. 1, FIG. 3 is an enlarged sectional view taken along the line T'' in FIG. A line sectional view, FIG. 5 is a side view of the transfer device, and FIG. 6 is an explanatory diagram of the workpiece positioning sequence by the device of the present invention. 1... Positioning device body, 3... Fixed main knock bin, 4... Movable knock bin, 5/10 rotating lever, 2
8a, 2Bbm a m stopper, ah. ...Transfer bar, 36...Transfer cylinder, Seki...Movable base, 51...Nut, 53.11
@Feed screw, 52/fog/servo motor.

Claims (3)

[Claims] (1) A device for positioning a rectangular block-shaped workpiece, in which one force θ) of a pair of dowel holes provided in the workpiece serves as a positioning reference; a stator dowel pin that engages and disengages from the dowel hole; a movable dowel pin that engages and disengages from the dowel hole, and a sub-knock bin moving device that positions the movable dowel pin in correspondence with the other dowel hole; and a transport position that transports the workpiece to different positions depending on the workpiece. Workpiece positioning device 0 characterized by being equipped with a changeable transfer device (2) A device for positioning a rectangular block-shaped workpiece, comprising: a fixed main dowel pin that is provided on the workpiece and engages and disengages from a pair of dowel holes that serve as positioning references; A sub-knock-bin moving device is provided with a movable dowel pin that engages and disengages from the other dowel hole, and the movable knock-bin is positioned correspondingly to the other dowel hole; and a transfer device that conveys the workpiece to different positions depending on the workpiece. A workpiece positioning device comprising: a workpiece shift device that pushes the workpiece in a direction perpendicular to the workpiece transfer direction; and a stopper that restricts the pushed workpiece to a fixed position. . (3) The workpiece positioning device according to claim 2, wherein the stopper is movable forward and backward depending on the type of workpiece.