JPH0448911Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is suitable for cutting workpieces, etc.
The present invention relates to a reference plane switching device that changes its fixing position depending on the type of workpiece.

(Prior Art) For example, as shown in FIG. 7, No. 5 to 6 are used as devices for cutting both end surfaces of a differential case housing a differential gear for an automobile.
There is something like the one shown in the figure. FIG. 5 is a side view showing the processing device, and FIG. 6 is a plan view. In addition, the differential case W shown in FIG.
The shape of the differential case differs slightly depending on the vehicle specifications, and in the case of the first differential case, L and T1 are constant dimensions, while the second differential case In the differential case, L and T2 are constant dimensions. Furthermore, in the processing process of the differential case, the positioning reference plane in the main cutting process is
This is part 5 shown in the figure.

The processing apparatus shown in FIG. 5 is composed of a positioning device 11 that positions the workpiece W, and two drive heads 12 and 13 that cut the workpiece W from both sides of the positioning device 11. The positioning device includes a slide unit 20 provided on a base 14 so as to be movable forward and backward by a hydraulic cylinder (not shown), a base 21 fixed on the slide unit 20, and this base 2.
The chuck 22 formed in 1 and the chuck 2
2, and an arm 23 that presses and positions the workpiece set at 2. Further, this arm 23 is moved by a hydraulic cylinder 24 to the workpiece W.
It can be rotated between a position where it is pressed and fixed, and a position where it is separated from the workpiece and released.

The drive head 12 is mounted on a base 14, and a slide unit 16 moves forward and backward with respect to the base 14 by a hydraulic cylinder 15.
, the drive head main body 17 fixed on the slide unit 16, and the drive head 1
A motor 19 that drives a tool 18 attached to 7.
It is composed of. Other drive head 1
Reference numeral 3 denotes a slide unit 25 mounted on the slide unit 20 of the positioning device 11 and moved forward and backward with respect to the slide unit 20 by a hydraulic cylinder (not shown), and a dry head main body 26 fixed on the slide unit 25.
and a motor 28 for driving a tool 27 attached to the drive head body 26.

Then, the slide unit 20 of the positioning device 11 moves forward with respect to the work W carried into the device by a transport device (not shown) (only the center position 29 of the transport device is shown), and the work W is transferred to the chuck of the positioning device 11. 22, the arm 23 of the positioning device 11 rotates to position the work W. Thereafter, the two drive heads 12 and 13 move forward from both sides of the workpiece W and are attached to their tips, and the workpiece W is driven by the tools 18 and 27 which are rotationally driven by the motors 19 and 28.
The cutting process is performed.

When the cutting process is finished, both drive heads 12 and 13 first retreat from the workpiece W, and after the arm 23 rotates to release the workpiece W, the slide unit 20 of the positioning device 11 retreats from the workpiece W. Furthermore, this work W is transported to the next process by a transport device.

(Problem to be solved by the invention) In such a conventional processing device, when there are many types of workpieces and the positioning reference surface of the workpieces by the positioning device is different, the drive head It is controlled to change the forward position. For example, in the case of the differential case shown in FIG. 7, there are two types of parts, and the dimensions from the positioning reference plane to each machined surface are different. In other words, when the differential case is set in the chuck, in the case of the first differential case, the distance between the reference plane and the machined surface on the right side in the figure is m1, whereas In the case of the second differential case, the distance is m2, and the distance between the reference plane and the machined surface on the left side in the figure is n1 in the first differential case, and n1 in the second differential case. The differential case is N2. Therefore,
If the type of workpiece is different, T1-
The processing position will be shifted by T2.

In such a case, the work W carried in by the transport device is moved to the chuck 22 of the positioning device 11.
The forward positions of the two drive heads 12 and 13 in the state set in the drive head are changed by a position detection means such as a limit switch, and the machining surface thereof is cut.

However, with such processing equipment, 2
Since position detecting means for each of the two drive heads is required, the control thereof becomes complicated, and there is a risk that equipment failure may occur. Another disadvantage is that it takes a lot of time to modify the equipment when a part model needs to be changed.

The present invention has been made in view of the problems and shortcomings of the prior art described above, and it is an object of the present invention to provide a reference plane switching device that simplifies the device, improves operational reliability, and allows for easy equipment modification. With the goal.

(Means for Solving the Problems) The present invention for achieving the above object is based on both ends of an eccentric shaft in which an eccentric part formed in the center is eccentric by a predetermined distance with respect to supporting parts formed at both ends. An arm is rotatably attached to the eccentric part of the eccentric shaft, and has a reference surface abutting part at its tip that contacts the reference surface of the workpiece to position the workpiece. The base is provided with a rotating means that rotates by a predetermined angle to change the position of the abutting part with respect to the machined surface of the workpiece, and the base is provided with a rotating means that rotates by a predetermined angle to change the position of the abutting part with respect to the machining surface of the workpiece. The reference plane switching device includes an arm pivoting means attached to the base for pivoting the arm to a position away from the reference plane.

(Function) In the present invention configured as described above, when the eccentric shaft is rotated by a predetermined angle by the rotation means,
The eccentric portion is eccentric by a predetermined distance with respect to the base that supports the eccentric shaft. As a result, when the arm attached to the eccentric portion is rotated by the arm rotation means, the reference surface abutting portion at the tip of the arm is displaced by a predetermined distance. Therefore, even when processing workpieces with different positioning reference planes, the positioning reference plane of the workpiece can be easily switched by detecting the type of the workpiece and operating the rotation means. .

(Example) Hereinafter, a description will be given based on an example of the present invention shown in the drawings.

FIG. 1 is a side view showing an example in which a reference plane switching device according to an embodiment of the present invention is applied to a cutting device, FIG. 2 is a plan view of FIG. 1, and FIG. FIG. 4 is a partially sectional side view showing a reference plane switching device according to an embodiment, and FIG. 4 is a front view of FIG. 3.

1 and 2 show an overall view of a reference plane switching device 30 according to an embodiment of the present invention.

As shown in FIGS. 3 and 4, the reference plane switching device 30 mainly includes a base 4 fixed to a slide unit 31, an arm 7 that presses the workpiece W, and an eccentric shaft 3 that connects the arm 7 and the base 4. It has become a major component. The eccentric shaft 3 is formed with support parts 2, 2 at both ends thereof and an eccentric part 1 in the center thereof, and the eccentric shaft 3 is rotated by 180 degrees with respect to the support parts 2, 2. It is sometimes formed to be eccentric by 1 mm. The support parts 2, 2 at both ends are bearings 32, 3
It is rotatably supported on the base 4 via the cylinder 2, and one end thereof is connected to the rotation shaft 9a of the first rotation cylinder 9.
is fixed to the key 33 by a key 33. Also, the first
A proximity switch 34 is provided at the other end of the rotation shaft 9a of the rotation cylinder 9, and the first rotation cylinder 9
The rotational position of the sensor can be detected. Furthermore, a lubricating oil supply path 35 is bored in the eccentric shaft 3 so that lubricating oil can be supplied to the bearings 32 and 36.

An arm 7 is connected to the eccentric portion 1 via a bearing 36.
is rotatably attached, and the tip of the arm 7 is formed in a shape corresponding to the external shape of the differential case, which is the workpiece W of this embodiment, and has three reference surfaces in contact with each other. A section 6 is provided. The reference surface abutting portion 6 is constructed by fixing a pin 38 having a flat tip to the arm 7, as shown in FIG.
A connecting shaft 38 is fitted into the base end of the arm 7, and is connected via a bearing 39 to an actuating portion 10a of a hydraulic cylinder 10 (see FIG. 1), which is arm turning means. Further, the hydraulic cylinder 10 is fixed to the base 4.

As a result, the operating portion 10 of the hydraulic cylinder 10
When a extends and contracts, the arm 7 rotates around the eccentric portion 1 of the eccentric shaft 3, and the reference surface abutting portion 6 at the tip of the arm 7 moves to a position close to the workpiece W as shown in FIG. , and a position away from the workpiece W. Two limit switches 40, 41 are attached to the base 4 to detect both positions, and brackets 42, 43 fixed to the base end of the arm 7 actuate the two limit switches 40, 41. Then,
The position detection is performed.

Eccentric part 1, which is the center of rotation of arm 7, and arm 7
A second rotation cylinder 44 is attached between the tip of the rotation cylinder 44 and the rotation shaft 44a thereof has a rotation stop surface 46a formed with a step that changes the stop position of the auxiliary contact portion 45, which will be described later. At the same time, a stop position member 46 rotatably supported by the arm 7 via a bearing 47 is fixed, and the second rotation cylinder 44 is actuated depending on the type of work W, and the rotation stop surface is 46a can be rotated. A proximity switch 48 is also provided at the other end of the rotation shaft 44a of the second rotation cylinder 44, so that the rotation position of the rotation shaft 44a can be detected.

Reference plane switching device 3 of this embodiment shown in FIGS. 3 and 4
0 can be applied to the cutting apparatus shown in FIGS. 1 and 2, for example.

The cutting apparatus shown in FIGS. 1 and 2 consists of a reference plane switching device 30, which is a positioning device, and two drive heads 49, 50, and a workpiece conveyance device 51 is provided in the center thereof. There is. The drive head 50 on the left side of the figure includes a slide unit 54 mounted on a base 52 so as to be movable forward and backward by a hydraulic cylinder 53, and a drive head main body 55 fixed on the slide unit 54.
A motor 57 that rotates a tool 56 attached to the tip of a rotating shaft (not shown) of the drive head body 55
On the other hand, the drive head 49 on the right side of the figure is a slide unit 59 mounted on a slide unit 31 of a reference plane switching device 30 to be described later so as to be movable forward and backward by a hydraulic cylinder 58.
, a drive head main body 60 fixed on the slide unit 59, and a drive head main body 6
Tool 6 attached to the tip of the rotating shaft (not shown) of 0
The two drive heads 49 and 50 are configured to move forward and backward relative to the workpiece W located at the center, as described above.

A slide unit 31 is attached to the base 52 so as to be movable forward and backward by a hydraulic cylinder 63.
In addition to the drive head 49 described above, a base base member 64 to which the base 4 of the reference plane switching device 30 is attached is fixed on the top. Further, the base member 64 is formed with the auxiliary contact portion 45 and is adapted to hold the workpiece W between it and the reference surface contact portion 6 of the arm 7.

The auxiliary contact portion 45 is formed such that a portion 45a that contacts the workpiece W and a portion 45b that contacts the stop position member 46 of the arm 7 move forward and backward together, and are supported by an elastic member (not shown) or the like. Spring biased towards the workpiece side. As a result, when the stop position member 46 is rotated by the second rotation cylinder 44, the auxiliary contact portion 45b is moved to the rotation stop surface 4.
The stop position changes due to the step of the arm 6a, and even if the position of the reference surface abutting portion 6 of the arm 7 changes, the workpiece W can always be held with the same elastic force.

Next, the operation of the cutting device to which the reference plane switching device 30 shown in FIGS. 1 and 2 is applied will be explained.

As shown in FIG. 1, the slide unit 31,
54 and 59 are all retracted, the differential case, which is the workpiece W, is carried into the apparatus by the conveying apparatus 51. After a vehicle type signal indicating the type of workpiece W is transmitted to a control unit (not shown) of the cutting device together with this carry-in signal, the slide unit 31 of the reference plane switching device 30 moves forward relative to the workpiece W. At this time, the second rotation cylinder 44 rotates to a rotation position predetermined depending on the type of workpiece W, and the base member 6
The auxiliary contact portion 45 formed at 4 contacts the stop position member 46 and presses one surface of the workpiece W. If the carried-in workpiece W is, for example, the first differential case (shown by a solid line in FIG. 7), the first rotation cylinder 9 serving as the rotation means rotates the eccentric shaft 3 is rotated 180°, and the base 4 supports the eccentric part 1 and the eccentric shaft 3.
It is eccentric to the left side of Figure 3 by 1 mm. Thereafter, when the arm 7 to which the eccentric part 1 is attached is rotated by the hydraulic cylinder 10 which is the arm rotation means, the reference surface contact part 6 at the tip of the arm 7 is moved by 1 mm to the left side in FIG. It will shift.

When the positioning of the workpiece W is completed in this way, the slide units 54 and 59 of both the left and right drive heads 49 and 50 move forward with respect to the workpiece W and start cutting. When the cutting process is completed, the slide units 54 and 59 of the drive heads 49 and 50 move backward, and the reference plane switching device 3
After the arm 7 of No. 0 also releases the positioning of the work W, the slide unit 31 of the device 30 moves backward, and the work W is transported to the next process by the transport device 51. Here, if the workpiece W carried in is of the same type as the previous workpiece W, the first and second rotation cylinders 9, 44 do not rotate and start positioning. The current rotational position of the rotation cylinders 9, 44 is determined by the proximity switch 3 attached to the rotation shafts 9a, 44a.
4 and 48 to a control section (not shown).

In this way, even when processing workpieces W with different reference planes 5 for positioning, the workpieces W
By detecting the type of the workpiece W and operating the first rotation cylinder 9, the positioning reference surface 5 of the workpiece W can be easily switched.

(Effects of the invention) As described above, in the present invention, the positioning device itself has an eccentric function to change the pressing position of the reference surface, so that the workpiece can be moved without changing the operating position of peripheral devices. The positioning reference plane can be easily changed. As a result, the apparatus itself can be simplified, equipment can be modified in a short time, and the reliability of equipment operation can be improved, which is a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of the reference plane switching device of the present invention applied to a cutting device, FIG. 2 is a plan view of the same, and FIG. 3 is a side view showing an example of the reference plane switching device of the present invention. 4 is a front view, FIGS. 5 and 6 are a side view and a plan view of a conventional cutting device, and FIG. 7 is a differential for an automobile, which is a workpiece for cutting. FIG. 3 is a half side view showing the case. 1... Eccentric part, 2... Support part, 3... Eccentric shaft,
4... Base, 5... Reference surface, 6... Reference surface contact portion, 7... Arm, 8a, 8b... Machining surface, 9...
...First rotation cylinder (rotation means), 10... Hydraulic cylinder (arm rotation means).

Claims (1)

[Scope of utility model registration request] A reference for positioning the workpiece by attaching the eccentric part formed in the center to the reference surface of the workpiece by rotatably attaching both ends of the eccentric shaft to the base by a predetermined distance with respect to the supporting parts formed at both ends thereof. An arm having a surface abutting portion at its tip is rotatably attached to the eccentric portion of the eccentric shaft, and the eccentric shaft is rotated by a predetermined angle to determine the position of the abutting portion with respect to the machined surface of the workpiece. arm rotating means for rotating the arm so that the reference surface contact portion is operated between a position where it contacts a reference surface of the workpiece and a position where it is separated from the reference surface; A reference plane switching device comprising: attached to the base.