JPH0120034B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an automatic multi-work processing line that is equipped with a plurality of processing stations and processes a plurality of types of workpieces that are carried in in random order. This invention relates to an automatic processing line for various types of workpieces equipped with a discrimination device.

[Prior art]

In an automatic processing line for various types of workpieces, if a discrimination device is installed only at the first processing station, which is the loading position of the workpiece, to detect and discriminate the dimensions of the workpiece, the If the processing line is stopped for some reason and the workpiece is replaced, if processing is restarted, the workpiece will be erroneously processed, resulting in defective products. On the other hand, there is a method that solves this problem by providing a workpiece discrimination device in each processing station. However, since the crankshaft, for example, is determined based on length, pin stroke, number of counterweights, etc., a complicated discrimination device is required, and if such a discrimination device is installed at each processing station, the processing line becomes complicated and Costs were getting high.

[Problem that the invention seeks to solve]

The present invention aims to solve the above-mentioned problems by simplifying a workpiece discrimination device provided at a station other than the first processing station.

[Means for solving problems]

For this purpose, the present invention, as shown in the embodiments of FIGS. 1 to 7, measures the dimensions of the workpiece W carried into the first processing station S1 in this type of automatic processing line for a variety of different types of workpieces. A work discrimination device 10 for discriminating the type of workpiece W and a discrimination hole machining device 40 for forming a discrimination hole Wf of a size corresponding to the discrimination result in the workpiece W are provided. A discriminating hole measuring device 60 is provided which measures the dimensions of the hole Wf and determines the type of workpiece W.

[Effect]

The workpiece W carried into the first processing station S1 is first measured by the workpiece discrimination device 10 to determine the type of the workpiece W, and then the discrimination hole processing device 40 discriminates the dimensions corresponding to the discrimination result. A hole Wf is machined in the workpiece W, and the workpiece W is sequentially transferred to each processing station S2, S3, . . . for the next process. At each processing station S2, S3..., the workpiece W has a discrimination hole detected by a discrimination hole inspection device 60.
The dimensions of Wf are measured, the type of workpiece W is determined, and processing corresponding to the determined type is performed.

〔Effect of the invention〕

The present invention requires a complicated workpiece discrimination device 10 that measures the dimensions of each part and discriminates the type of workpiece W at the first processing station S1 where the workpiece W is carried into the processing line. In the subsequent processing stations S2, S3, . . ., the work W is discriminated only by measuring the discrimination hole Wf, so the discrimination hole inspection device 60, which has a simple structure, is sufficient.
Therefore, processing stations S2 and S3 after the next process
The structure of ... becomes simple, and the equipment cost of the processing line can be reduced. Moreover, even if the workpiece W is replaced in the middle of the processing line, there is no risk of the same processing occurring.

〔Example〕

Fig. 1 shows the entire automatic processing line for various types of workpieces, in which workpieces W (crankshafts in this embodiment) of multiple types of sizes are sent in random order by a workpiece transport line T, and are first carried to the first processing station S1. After the discrimination hole is machined, the work piece is sent to the next processing station S2 by the workpiece conveyance line T and processed, and then sequentially sent to processing stations S3, S4, etc. for processing in the same manner.

The first processing station S1 is provided with a workpiece discrimination device 10 shown in FIG. 2 and a discrimination hole processing device 40 shown in FIGS. 3 and 4. The workpiece discrimination device 10 approaches the workpiece W carried in and measures the dimensions of each part to determine the type of the workpiece W. The discrimination hole processing device 40 detects the type of workpiece W after the workpiece discrimination device 10 has retreated. Approach the workpiece W and drill a discrimination hole Wf with dimensions corresponding to this discrimination result.
It is processed into In this embodiment, the workpiece W is a crankshaft, which is positioned in the axial direction with the center journal Wc as a reference by a support device (not shown), is positioned at a constant angular position, and is supported by the processing station S1. shall be

As shown in FIG. 2, the workpiece discrimination device 10 includes a pin stroke measuring device 20 and a length measuring device 30.
Both 20 and 30 are supported by a support plate 11 provided on the frame of the first processing station S1. The main parts of the pin stroke measuring device 20 are first and second guide pipes 21 supported by a support plate 11 so as to be able to move axially.
21a, a second rod 23a supported in a axially movable manner by the second guide pipe 21a, and both 21
a, 23a and both 21a, 23a
a first stroke detector 28 that detects the relative displacement of
and first and second engaging members 25 fixed to the first guide pipe 21 and the second rod 23a, respectively.
25a, and a first cylinder 26 that operates these components. The first and second guide pipes 21 and 21a are integrally connected at their distal ends by a connecting member 22, and have two guide tubes 13 fixed to the support plate 11,
13, it is supported so as to be axially movable toward the workpiece W from the right angle direction. The second rod 23a, which is axially supported by the second guide pipe 21a, is urged toward the workpiece W by a spring 27a interposed between the two rods 21a and 23a. The tip of the piston rod 26a of the first cylinder 26 slidably passes through the connecting member 22, and the tip is connected to the first guide pipe 26 through the connecting piece 24.
The connecting member 22 is coupled to the distal end of the first rod 23 which is pivotally supported by the piston rod 26.
It is urged toward the workpiece W by a spring 27 interposed between the flange 26b of a and the connecting member 22.

The first cylinder 26 is in an inoperative state (the first and second engaging members 25, 25a are connected to the crank pin Wa,
When the spring 2 is not in contact with Wb), the spring 2
7, 27a, the connecting member 22 is brought into contact with the connecting piece 24, and the flange 23b of the second rod 23a is brought into contact with the second rod 23a.
It is in contact with the inner end surface 21b of the guide pipe 21a. When the first cylinder 26 operates, the guide pipes 21, 21a, the connecting member 22, the second rod 23, and the engaging members 25, 25a move toward the workpiece W, and the V-shaped notch at the tip of the second engaging member 25a ( When the second engaging member 25a and the second rod 23a come into contact with the crank pin Wb of the workpiece W (not shown), the second engaging member 25a and the second rod 23a stop, and the other members (the guide pipes 21, 21a, the connecting member 22, the first engaging member 25 etc.) continue to move. In this state, the spring 27a is bent and the second guide pipe 21a and the second rod 23a are displaced relative to each other, and the displacement is measured by the first stroke detector 28. When the first cylinder 26 is further operated and the V-shaped notch (not shown) at the tip of the first engaging member 25 comes into contact with the crank pin Wa of the workpiece W which is 180 degrees out of phase with the crank pin Wb, the first cylinder 26 is activated.
The engaging member 25, the guide pipes 21, 21a, and the connecting member 22 are stopped, and then the spring 27 is bent and the first cylinder 26 stops operating in the state shown in FIG. In this state, the pin stroke s of the workpiece W is detected by the first stroke detector 28.
is measured. Note that the first stroke detector 28
For this purpose, a moving distance detector such as a linear scale or magne scale is used.

The main part of the length measuring device 30 is the support plate 11
the slider 31 supported by the slider 31, and both 11, 3
A second stroke detector 36 is provided between the two stroke detectors 11 and 31 to detect relative displacement between the two, a swing arm 33, and a second cylinder 35 that operates these components. The slider 31 has two guide rods 32,
The swing arm 33 is slidably supported by the support bracket 12 fixed to the support plate 11 via the support bracket 12 in a direction parallel to the workpiece W.
The slider 31 is pivotally supported by the support plate 12, and a long hole 33a at one end thereof is engaged with a pin 31a of the slider 31.

When the second cylinder 35 is inactive, the swing arm 33 is in the state shown by the two-dot chain line in FIG. As shown by the solid line in FIG. 2, the swing arm 33 is swung clockwise through the center journal Wc, and the tip of the swing arm 33 is placed on the reference plane Wd of the workpiece W which is axially positioned and supported with the center journal Wc as a reference. come into contact with In this state, the second stroke detector 36 measures the reference length l of the workpiece W. The workpiece discrimination device 10 of this embodiment discriminates the type of workpiece W based on the pin stroke S and reference length l of the workpiece W.

As shown in FIGS. 3 and 4, the discrimination hole machining device 40 includes a machining unit 41 equipped with a drill 42 and a drive motor 43, and a slide base 17 and a machining unit 41 are installed on the bed (not shown) of the first machining station S1. It is supported via a cross table 18 so as to be movable in the X direction and the Y direction. Discrimination hole Wf
The machining is performed in a state in which the machining unit 41 is shifted from the state shown in FIG. 3 by a distance x toward the front side in the X direction using a cylinder (not shown), and the drill 42 is made coaxial with the workpiece W. The discrimination result of the workpiece discrimination device 10 controls the discrimination hole processing device 40.
The NC control device drives a servo motor (none of which is shown) that moves the slide base 17 in the Y direction via a feed screw to move the workpiece W as shown in FIG. A discrimination hole Wf of depth A corresponding to the type is machined coaxially with the work W. Note that the end surface of the workpiece W is subjected to core kneading in advance using a centering tool 46, which will be described later.

As shown in FIGS. 3 and 4, in this embodiment, the discrimination hole processing device 40 includes a discrimination hole confirmation device 5.
0 is set. The discrimination hole confirmation device 50 includes a swinging arm 51 that is pivotally supported by a processing unit 41.
, a measuring head 53 at its tip, and a cylinder 54 that raises and lowers these between the measuring position (see the solid line in Figure 4) and the retreat position (see the two-dot chain line). In this position, the measuring axis 53a of the measuring head 53 is coaxial with the center 46. Discrimination hole
After completing the machining of Wf, the machining unit 41 is shifted in the X direction by a distance x using a cylinder (not shown),
Center hole We with the centering tool 46 described later.
After machining, the discrimination hole confirmation device 50 is lowered to the measurement position, the inspection axis 53a is set coaxially with the workpiece W as shown in FIG. Move to a predetermined position in the Y direction according to the type of
The tip of 3a is brought into contact with the tip of the discrimination hole Wf to displace the measuring shaft 53a in the axial direction, and the displacement is detected by the encoder 53b to confirm that there is no error in the depth A of the discrimination hole Wf.

A centering tool 46 is also pivotally supported in the discrimination machining hole device 40 at a position parallel to the drill 42 and separated by a distance x in the X direction. Prior to machining the discrimination hole Wf, the centering tool 46 is driven to rotate with the discrimination hole confirmation device 50 retracted upward, and is rotated by the aforementioned servo motor (not shown) together with the machining unit 41 according to the type of work Wf.
It is driven forward to a predetermined position in the direction and performs centering for machining the discrimination hole Wf on the end face of the workpiece W, and
After machining the discrimination hole Wf and prior to its confirmation, the center hole We is similarly machined.

Processing stations S2, S3, S after the next process
4... are each provided with a discrimination hole inspection device 60 having a center that supports the workpiece W. 6th
As shown in FIG. 7 and FIG.
1, a ram 62 with a center 64 at its tip, and a measuring rod 65 supported by the ram 62 so as to be able to pivot.
and a third stroke detector 68 provided between the two 62 and 65 to detect relative displacement between the two. An inspection stand 61 fixed on a support stand 19 supports a ram 62 through guide tubes 63, 63a so that it can only be axially moved in the Z direction parallel to the drill 42, and a center 64 is provided at the tip of the ram 62 with a tapered center. are fitted and fixed. Inspection rod 65 is ram 6
2 and the center 64 so as to be coaxially movable,
The spring 69 urges the ram 62 toward its tip, causing the tip of the measuring rod 65 to protrude beyond the center 64. A cylinder 63 is installed inside the guide tube 63.
b is formed and a piston 62b formed at the center of the outer periphery of the ram 62 is fitted into the cylinder 63b,
By alternately applying working fluid to both cylinder chambers, the ram 62 is moved forward and backward in the Z direction together with the measuring rod 65. As shown in FIG. 6, at the rear of the ram 62 and the measuring rod 65 that protrude rearward, there are first and second brackets 6 that protrude laterally, respectively.
6, 67 are fixed, and both brackets 66, 6
7 is slidably engaged with a guide bar 67a. A measuring head 68a and a scale 6 are fixed to the first and second brackets 66 and 67, respectively.
8b constitutes a third stroke detector 68 that detects the relative displacement between the ram 62 and the measuring rod 65.

When the working fluid is applied to the left side of the piston 62a of the cylinder 63b and the ram 62 is retracted, the tip of the measuring rod 65 is connected to the spring 69.
most prominent. After temporarily supporting the workpiece W in this state, if working fluid is applied to the right side of the piston 62a of the cylinder 63b, the ram 62
The inspection rod 65 moves forward, and first, the tip of the inspection rod 65 comes into contact with the tip of the discrimination hole Wf and stops.
Thereafter, the spring 69 is bent and only the ram 62 moves forward, and the center 64 at the tip engages with the center hole We to support the workpiece W. In this state, the third
The stroke detection device 68 detects the relative displacement between the ram 62 and the inspection rod 65, and the depth A of the discrimination hole Wf is measured to determine the type of workpiece W. Next, this machining station operates to perform a predetermined machining process on the workpiece W.

To summarize the entire operation of this embodiment, the workpiece discrimination device 10 approaches the workpiece W carried by the workpiece transport line T to the first processing station S1 and is supported, and the pinstroke measuring device 20 and the workpiece After determining the type of workpiece W using the depth measuring device 30, the depth A corresponding to the determination result is determined.
The discrimination hole Wf is machined by the discrimination hole processing device 40, and then the center hole is machined by the centering tool 46.
After processing We, the depth A of the discrimination hole Wf is confirmed by the discrimination hole confirmation device 50. Thus,
When the machining at the machining station S1 is completed, the workpiece W is transported to the next machining station S2 by the workpiece transport line T, and is supported by a discrimination hole inspection device 60 equipped with a center 64 to measure the depth of the discrimination hole Wf. The workpiece W is measured, the type of the workpiece W is determined, and processing corresponding to the determined type of the workpiece W is performed. In the same manner, processing stations S
Processing is performed in 3, S4...

Note that the diameter of the discrimination hole Wf may be changed instead of changing the depth depending on the type of workpiece W as in the above embodiment. Further, in the above embodiment, the discrimination hole inspection device 60 is incorporated into the center support device that supports the workpiece, but the discrimination hole inspection device 60 may be incorporated into the chuck and the main shaft so that the workpiece is supported by the chuck, or the discrimination hole inspection device 60 may be incorporated into the chuck and the main shaft. A discrimination hole inspection device may be provided independently of the W support device.

[Brief explanation of drawings]

1 to 7 show one embodiment of the present invention, FIG. 1 is an overall layout diagram, FIG. 2 is a structural diagram of a workpiece discrimination device, FIG. 3 is a plan view of a discrimination hole processing device, and FIG. 4
The figure is a side view seen from the direction of Figure 3, Figure 5 is a diagram showing the processing state of the discrimination hole, Figure 6 is a plan view of the discrimination hole inspection device, and Figure 7 is a cross-sectional view of Figure 6. It is. Explanation of symbols, 10... Workpiece discrimination device, 40...
...Discrimination hole processing device, 60...Discrimination hole inspection device, W
... Workpiece, Wf ... Discrimination hole, S1 ... First machining station, S2, S3, S4 ... Machining stations after the next process.

Claims (1)

[Claims] 1 In an automatic multi-work processing line that is equipped with multiple processing stations and processes multiple types of workpieces that are brought in in random order, the first processing station measures the dimensions of the workpieces that are brought in to determine the type of the workpiece. A discrimination hole machining device is provided to drill a discrimination hole in the same workpiece with a size corresponding to the discrimination result, and a processing station after the next process measures the size of the discrimination hole and determines the type of the same workpiece. This is an automatic processing line for a wide variety of workpieces, which is characterized by being equipped with a discrimination hole inspection device that discriminates.