JPS6284956A - Chuck slip detecting device in shaft-like article working system - Google Patents

Abstract

PURPOSE:To aim at preventing defective parts in working from being delivered to the next process station, by rotating a pair of rotary arms clamping therebetween an accentric section of a shaft-like part in synchronization with each other, and by comparing the rotating angle thereof with that upon abutting to detect a chuck slip. CONSTITUTION:A shaft-like workpiece W is pressed against a pressing pin 5 by means of an operating mechanism 4, being supported on beds 2, 3, and is clamped in its eccentric section (w) by a pair of rotary arms 20 which is rotated in its normal direction, so that it is positioned in its rotating direction. the data of rotating angle of the rotary arms 20 are stored in a memory in a control device 19. Thereafter, the workpiece is secured by a chuck 6, and the rotary arms 20 are reversed to retract from the working space. Accordingly, the drilling of a hole H is performed. Further, after completion of the drilling, the rotary arms 20 are again normally rotated, and therefore, abuts against the eccentric section (w). The rotating arms of the rotary arms 20 is detected by a detector 18, and is transmitted to the control device 19 in which it is compared with the previous stored rotating angle data. If it is out of a tolerance, a failure in working due to a chuck slip is indicated. Thus, it is possible to enhance the working efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a chuck slip detection device for a shaft component machining system that performs drilling, machining, etc. on a shaft component such as a crankshaft.

(Conventional technology) Recently, machining of shaft parts such as crankshafts is
There are many cases where this is done on medium-sized, medium-weight lines. It should be noted that this medium-size, medium-weight line is a processing line that is solely responsible for processing workpieces of various sizes.

By the way, drilling holes such as oil holes in the journal part and bottle part of the crankshaft on this medium-sized and medium-weight line is performed by automatic machine tools such as Roponto and NC-only machines, so this crankshaft The machining process is performed while being held in a fixed position relative to the machine tool by a clamp jig to ensure machining accuracy.

This clamp jig includes a holding member that holds the crankshaft from both ends to fix the position of the crankshaft in the axial direction, and a holding member that holds at least one end of the crankshaft and holds each part of the crankshaft in the rotational direction. A configuration including a chuck for fixing the position of the is used.

(Problem to be Solved by the Invention) However, since the gripping force of the crankshaft by the chuck is required not to cause scratches on the crankshaft, the gripping force must be weakened accordingly. Due to the thrust of There is a problem in that the deteriorated material flows to the subsequent process and causes damage to machine tools in the subsequent process.

The present invention has been made in view of the above circumstances, and its purpose is to provide a chuck slip detection device for a shaft component machining system that prevents defective products from flowing into subsequent processes. be.

(Means for solving problems) Therefore, the present invention has the following configuration.

That is, in a shaft component machining system equipped with three clamp jigs that grip a part of a shaft component, which is a workpiece, with a chuck during machining and fix the rotational direction position of each part of the shaft component, the eccentricity of the shaft component is fixed. an arm mechanism including at least a pair of rotating arms that can make contact with a part and sandwich the eccentric part when making contact; and an arm drive mechanism that rotates the pair of arms in synchronization. .

a rotation angle detector that detects a rotation angle of at least one of the plurality of rotation arms; and the arm drive mechanism for bringing the plurality of arms into contact with the eccentric portion before and after processing the shaft component. A chuck slip detection device for a shaft parts processing system, comprising: a means for controlling the angle of rotation and acquiring data from the rotation angle detector at each time of contact; and a comparison means for comparing the data at each of the rotation angles. It is.

(Operation of the Invention) In this configuration, first, the eccentric portion of the shaft component moves around the axis of the shaft component by rotation of the shaft component.

The rotation angle of the rotation arm changes depending on the position of the eccentric portion. Therefore, if chuck slip has not occurred, there will be no change in the position of the eccentric part, and therefore the data from the rotation angle detector will also remain unchanged.On the other hand, if chuck slip has occurred, there will be no change in the position of the eccentric part. Because of this, there are also changes in the data from the one-turn angle detector, so it is possible to detect chuck slip by comparing the data before and after machining.

In addition, since the eccentric part of the shaft part is sandwiched between a pair of rotating arms that rotate synchronously before processing, the shaft part can be rotated by the power from the rotating arms. It can be used to position each part of a shaft component in the rotational direction, and the center position between the pair of rotating arms remains constant regardless of the rotation angle, so it can accommodate shaft components of various sizes. This means that you can do it.

(Embodiment) An embodiment in which the present invention is applied to a processing system for drilling oil holes in a crankshaft will be described below with reference to the drawings.

In FIGS. 1 and 2, l is a base, and on this base 1"2, there is a pedestal 2.3, an operating mechanism 4, a pressing pin 5.5 and a chamfer constituting the clamping jig. , and 6 are installed.

The work W can be placed on the receiver 2.3, and the receiver 2 is placed and fixed on the step 8 of the upright wall 7 erected on the base 1. , the support stand 3 is erected on the base 1 in the form of a column.

The actuating mechanism 4 consists of a fixed part 9 and a movable part 10. The fixed part 9 is mounted on a base l with a convex step, and the movable part 10 is mounted on the fixed part 9. It reciprocates in the axial direction and rotates in forward and reverse directions around the axis.

Further, the actuation mechanism 4 has a built-in position indexing mechanism, and can control the movement stroke of the movable part 10 in the axial direction and the rotation angle in the direction around the axis to a predetermined amount. The movable part 10 is arranged to face the upright wall 7 with a space therebetween, and the support stand 2.3 is located between the facing surface 12 of the upright wall 7 and the facing surface 13 of the movable part 1O. It is like that.

For pressing, the bottles 5.5 are pressed against each end of the workpiece W, and serve to fix the position of the workpiece W in the axial direction. The pin 5 is fixed to the facing surface 13 of the movable part 10, and the pin 5 is fixed to the opposing surface 13 of the movable part 10, and the pin 5 is fixed to the opposing surface 13 of the movable part 10, and the pin 5 is fixed to the opposing surface 13 of the movable part 10. : The bottle 5.5 faces the other end of the workpiece W, and by operating the actuating mechanism 4 and moving the movable part 10 toward the upright wall 7 side, the bin 5.5 can be pushed against the other end of the workpiece W. It is pressed against each end.

The chuck 6 is attached to the opposing surface 13 of the movable part IO,
The other end of the workpiece W is grasped to fix the rotational position of each part of the workpiece W.

14 is the main body of this chuck 6, and the chuck 14 has three chuck claws 15 that move synchronously on this main body 14.
．． 15.15 is of an interlocking three-jaw chuck configuration that holds the parts at equal intervals in the circumferential direction.

16 is an arm mechanism, 17 is an arm drive mechanism, 18 is a rotation angle detector, 19 is a control device, and these elements 16
19 constitute the chuck slip detection device according to the present invention.

The arm mechanism 16, as also shown in FIGS. 3 and 4,
A pair of rotation arms 20.20 and a pair of rotation support shafts 21.2
The zero rotation arms 20 and 20, which are roughly constructed from 1 and 2, are each fixed to each rotation support shaft 21,
Each rotation support shaft 21.21 is rotatably supported by a bearing 22.22 on the upright wall 7 of the base 1, thereby allowing each arm 20 to rotate. The rotation of each arm 20 allows the free end portion to come into contact with an eccentric portion W of the workpiece W (here, a crank bin).

The arm drive mechanism 17 includes a pair of binion gears 23 and 23.
, a rack 24 and a cylinder device 25. Each of the pinion gears 23 is fixed to each rotating support shaft 21, and has seven teeth facing each other with an interval. The rack 24 has these pinion gears 2
3.23, and a rack portion 26 is formed on the side facing each of the binion gears 23, and one rack portion 26 is located between one of the binions IIM! if 23, and the other rack portion 26 meshes with the other pinion gear 23.
When the rack 24 reciprocates, the pair of rotating arms 20 and 20 rotate in synchronization. As a result, both rotating arms 20.2
The center position between 0 and 0 does not shift.

Note that the pair of binion gears 23 and 23 are meshed with each other,
Either one of the racks 24 may be configured to match 11a, 27 is the cylinder of the cylinder device 25, 28
is the same piston rod, and the rack 24 constitutes a part of this piston rod 2B, and is reciprocated by the power of this cylinder device 25. Moving arm 20.20
When the workpiece W is not gripped by the chuck 6, the workpiece W can be rotated through the eccentric portion W, and conversely, when the workpiece W is gripped by the chuck 6, the workpiece W cannot be rotated. It rotates until it hits the eccentric part W and then stops. That is, here, the rotation of the pair of rotation arms 20 in the direction approaching the eccentric portion W (arrow C direction in the figure) is normal rotation, and the rotation in the opposite direction (
If rotation in the direction indicated by the arrow in the figure) is defined as reversal, the pair of rotation arms 20, 20 will be rotated before the workpiece W is gripped by the chuck 6 and before the workpiece W is processed, as will be described later.
After processing, the chuck B rotates forward twice before the gripping operation by the chuck B is released.

First, during the first normal rotation, the re-rotating arms 20, 2
0 rotates until it abuts on the eccentric part W. In other words, if one rotating arm 20 abuts on the eccentric part W earlier than the other rotating arm 20, it pushes the workpiece W.
As shown in FIG. The rotation of the re-rotation arms 20.20 is stopped when the re-rotation arms 20.20 touch each other, and each part of the workpiece W is positioned in the rotational direction, and the center position between the re-rotation arms 20.20 is determined according to its rotation angle. Since the position does not change depending on the direction of rotation, it is possible to perform positioning in the rotational direction corresponding to workpieces of various sizes.
The re-rotating arm 20.20 rotates until at least one of the rotating arms 20 comes into contact with the eccentric portion W. In other words, when one of the rotating arms 20 comes into contact with the eccentric portion W and stops, the other rotating arm 20. The movable arm 20 also stops even if it does not come into contact with the eccentric portion W. In this case, as shown in FIG. 4, it is possible to find a difference between the rotation angle during the first normal rotation and the rotation angle during the second rotation, as indicated by the symbol M. A spacer 33, which is softer than the work W, is fixed to the free end of each rotating arm 20 that comes into contact with the eccentric portion W, and the spacer 33 prevents the work W from being damaged.

The rotation angle detector 18 consists of a rotary encoder, and has two rotary encoders.
9 is its body, and 30 is a rotation input shaft. body 28
is fixed to the opposite surface of the upright wall 7 to the opposite surface 13 through a bracket 31. The rotation input shaft 30 is connected to one rotation support shaft 21 via a connector 32, and is adapted to detect the rotation angle of one rotation arm 20. The output signal of this rotation angle detector 18 is
19.

The control device 19 controls the arm drive mechanism 17 to rotate the pair of rotating arms 20 and 20 twice in the normal direction, and obtains rotation angle data from the output signal of the rotation angle detector 18 during each normal rotation. It has the function of taking in the rotation angle data at each forward rotation and comparing the rotation angle data with each other, and the control flow shown in FIG.

Next, the cycle in the previous system will be explained with reference to FIG. 5.

The workpiece W is first placed on the stand 2.3, then the actuation mechanism 4 is activated, and the pins 5.5 are pressed against each end to position the workpiece W in the axial direction. Fixed. Subsequently, the pair of rotating arms 20 and 20 rotate in the normal direction, and the rotational direction position of each part of the workpiece W is determined, and the rotation angle data X of the rotating arms 20 during this normal rotation is taken in. Once stored in memory.

When the storage in the memory is completed, the chuck 6 is activated to grip the end of the workpiece W, fixing the rotational position of each part, and then the rotating arms 20 and 20 are reversed and the workpiece W is moved into the working space of the machine tool. is removed from the machine tool, and one half of the holes H, H1... is machined, and then rotated 180 degrees by the actuating mechanism 4, the other half is machined and penetrated, and the holes H, The drilling of H1... is completed.

When the drilling of holes H, H1... is completed, the rotating arm 20
．． 20 is rotated normally again, the rotation angle data Y at that time is taken in, and the rotation angle data X is called.

First, it is determined whether the rotation angle data X and Y have the same value. Here, if it is determined that they are the same, the clamp jig performs an unclamp operation, and the workpiece W is sent to the next process, completing one cycle. On the other hand, if it is determined that they are different, Its rotation angle data X, Y
It is determined whether the difference is within an allowable value. Here, if it is determined that it is within the allowable range, the clamp jig performs an unclamping operation, and the workpiece W is sent to the next process and l The cycle ends. If it is determined that it is not within the allowable range, it is displayed as a machining defect using an abnormality indicator lamp attached to a control panel, etc., the cycle is interrupted, and the workpiece W is not sent to the next process.

Although the embodiments have been described in detail above, the present invention also includes the following concepts.

(1) Applicable machining systems for shaft parts include:
In addition to processing systems for crankshafts, there are also systems for machining key grooves on shaft parts, and processing systems for manufacturing shaft parts with eccentric parts.

(2) Rotating arms may be provided specifically for determining the rotational direction and position of the shaft component and for detecting chuck slip.

(3) As the rotation angle detector, in addition to a rotary encoder, a rotation angle detector, a near scale, etc. can be used. Note that when using a linear scale, the portion of the arm drive mechanism 17 that moves linearly, that is, the rank 24
Or the piston loft 28 in the cylinder device 25
The amount of linear movement will be detected.

(Effects of the Invention) As described above, according to the present invention, chuck slips can be detected, so if this detection is performed before sending shaft parts to the subsequent process, defective products can be detected. This has the effect of being able to prevent leakage to subsequent processes.

In addition, conventionally, the positioning of shaft parts in the rotational direction was
A reference block is provided in which a reference plane is formed at the eccentric portion, and the reference block is placed in such a way that this reference plane can be brought into contact with the rotation of the shaft component, and the position of this reference block is adjusted in advance to suit the rAt15. Previously, this was done by setting the dimensions and applying the base surface to the reference block, but since shaft parts of various sizes are flown randomly on the medium-sized and medium-weight line, it is necessary to set the standard every time the dimensions differ. There were problems with work efficiency, such as having to change the position of the block and readjusting the trial cutting shed, and also having to remove the reference block from the working space of the machine tool every time machining was performed. However, according to the present invention, since the eccentric portion of the shaft component is sandwiched between a pair of rotating arms that rotate synchronously before processing, the shaft component is rotated by the power from the rotating arms. Since it can be folded down, it can be used for positioning each part of the shaft component in the rotational direction, and the center position m between the pair of rotating arms is constant regardless of the rotation angle. Since it is possible to handle shaft parts of various sizes, conventional positioning work can be eliminated, which leads to improved work efficiency and helps complete automation of the process.

[Brief explanation of drawings]

Figure 1 is a front view of the main parts of the shaft parts processing system according to the present invention, and Figure 2 is the left side of the center line! A sectional view taken along the line A-A for h and the right half taken along the line B-B. FIG. 3 is an explanatory diagram showing the operating state of the rotating arm when no chuck slip occurs, FIG. 4 is an explanatory diagram showing the operating state of the rotating arm when chuck slip occurs, and FIG. The figure is a flowchart of the control contents of the control device shown in FIG. 1. It is. 5...Press pin Clamp jig 6...Chuck 16...Arm mechanism 17...Arm drive mechanism Chuck slip 18.
...Rotation angle detector detection device 19...
Control device 20...Rotating arm patent applicant Toyota Motor Corporation (and 1 others)
given name)!ゝ- Fang 3, Fang 4, Fang 5

Claims (1)

[Claims] (1) In a shaft component machining system equipped with a clamp jig that grips a part of a shaft component, which is a workpiece, with a chuck during machining and fixes the rotational direction position of each part of the shaft component, an eccentric portion of the shaft component. an arm mechanism including at least a pair of rotating arms that can make contact with the eccentric portion and sandwich the eccentric portion when making contact; and an arm drive mechanism that rotates the pair of rotating arms in synchronization. and a rotation angle detector that detects the rotation angle of at least one of the plurality of rotation arms, and a rotation angle detector that detects the rotation angle of at least one of the plurality of rotation arms, and a rotation angle detector that detects the rotation angle of at least one of the plurality of rotation arms, and a rotation angle detector that detects the rotation angle of at least one of the plurality of rotation arms, and a rotation angle detector that detects the rotation angle of at least one of the plurality of rotation arms, and a rotation angle detector that detects the rotation angle of at least one of the plurality of rotation arms, and a rotation angle detector that detects the rotation angle of at least one of the plurality of rotation arms. A chuck for a shaft component machining system, comprising: means for controlling a drive mechanism and acquiring data from the rotation angle detector at each time of contact; and comparison means for comparing data at each time of contact. Slip detection device.