JPH0216167B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of controlling an automatic shake measuring and correcting machine.

[Conventional technology]

When a shaft-shaped member such as a power steering pinion is formed by forging, rolling, etc., runout (distortion) may occur in the shaft-shaped member. In order to correct the runout of such a shaft-shaped member, the correction has conventionally been carried out by pressing and bending the runout portion of the shaft-shaped member in a direction opposite to the runout direction using a press to cause plastic deformation. At this time, the amount by which the shaft-shaped member must be pushed and bent in the direction opposite to the deflection to eliminate the deflection in the released state is determined by calculation. Therefore, when actually correcting the runout of a shaft-shaped member, press while measuring how far the shaft-shaped member is bent in the opposite direction, stop applying pressure when it matches the calculated value, and raise the ram. ing.

[Problem that the invention seeks to solve]

By the way, in the above conventional method, when there are foreign substances such as burrs on the surface of a pinion for power steering, for example, due to worm gear rolling,
This may result in defective corrections. In other words, when the ram of the press touches the shaft-shaped member, the shaft-shaped member moves slightly and the contact condition of the burr etc. at the part where the amount of bending is measured changes, even though the shaft-shaped member has not yet been bent. , a change of about 0.1 mm to 0.2 mm may occur in the measured value.

In the case of a power steering pinion, this amount of change is approximately the same as the correction stroke, and directly becomes an error in the ram stroke, causing excessive bending or defective bending of the shaft-shaped member. As a result, problems such as poor correction and breakage of the shaft-shaped member may occur.

[Means for solving the problem]

The above problem can be solved by eliminating the influence of foreign substances such as burrs.
This problem is solved by the following method for controlling an automatic shake measuring and correcting machine of the present invention.

That is, in the control method of the automatic runout measurement and correction machine of the present invention, the portion of the shaft-shaped member with large runout is placed below the ram of the automatic runout measurement and correction machine, and is supported at both ends thereof so as to face the ram. A control method for an automatic runout measurement and correction machine that corrects runout by plastically deforming it by pressing a large part of The standard load and the correction load to correct the runout of the shaft-shaped member are set in two stages. First, the standard load is applied, and in this state, the deflection amount measurement value with the deflection amount measuring element is set to zero, and then the correction load is applied. The method is characterized in that the shaft-shaped member is pressed and plastically deformed until it reaches a predetermined deflection amount measurement value for each shaft-shaped member.

[Effect]

According to the control method of the automatic runout measuring and correcting machine of the present invention, the ram load is set in two stages: a standard load that does not cause plastic deformation of the shaft-shaped member, and a correction load that actually performs correction, and the ram load is first set at the standard load. Press the shaped member. At this time, if a foreign object such as a burr is attached to the portion where the amount of bending is to be measured, the degree of contact between the member for measuring the amount of bending and the shaft-shaped member changes when the shaft-shaped member moves slightly. However, in order to zero-set the deflection amount measurement value so that this changed and stable posture becomes the origin of the correction stroke,
Changes in the contact between the bending amount measuring member and the shaft-shaped member due to foreign objects such as burrs will not affect the correction stroke.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the control method for an automatic runout measuring and correcting machine of the present invention is applied to correcting the runout of a power steering pinion.

Here, FIG. 1 is a schematic configuration diagram showing a state in which shake is corrected by a control method for an automatic shake measuring and correcting machine according to an embodiment of the present invention.

First, the structure of the automatic shake measurement and correction machine will be explained.
In FIG. 1, reference numeral 1 denotes a base, and four pillars 2 are erected on this base 1. A holder 3 is provided at the upper end of this column 2, and a hydraulic cylinder 4 is attached to this holder 3 so as to face downward. A ram 6 is attached to the tip of the piston rod 5 of the hydraulic cylinder 4, and the ram 6 is guided by a guide portion 7 and is movable up and down along the column 2 by hydraulic drive.

Further, a support stand 8 is attached to the base 1, and on this support stand 8, below the ram 6,
Power steering pinion 9, which is a shaft-shaped member
A pair of pedestals 10 are erected for receiving. A rotation/index device 11 is provided near the cradle 10 to rotate the power steering pinion 9 and index the runout portion.
Further, a deflection measuring element 12 is attached below the ram 6 on the support base 8 so as to face the power steering pinion 9. In addition, a runout measuring element 1 for measuring the runout of the power steering pinion 9
3 is provided on the back side of the power steering pinion 9 in FIG.

Next, the operation will be explained.

First, position the ram 6 at the top dead center, and
Place the power steering pinion 9 on top.
Next, rotate the power steering pinion 9.
It is rotatably supported by an indexing device 11, and a runout measuring element 13 is brought into contact with the power steering pinion 9. Then, the power steering pinion 9 is rotated by the rotation/indexing device 11, the position with the largest runout is determined by the runout measuring element 13, and the power steering pinion 9 is installed with its convex side facing the ram 6. . Subsequently, low-pressure oil for the reference load is sent to the hydraulic cylinder 4 by a pressure regulator from a hydraulic source (not shown). As a result, the ram 6 descends while being guided by the support column 2 by the hydraulic cylinder 4, contacts the power steering pinion 9, presses the power steering pinion 9, and stabilizes the posture. Next, the input of the deflection amount measuring element 12 is set to zero, and the oil pressure is switched to the correction load. Then, the ram 6 further descends, pushing the power steering pinion 9 downward and bending it. At this time, the deflection measuring element 12 pressed against the power steering pinion 9 is also pushed down. When the amount of deflection measured by the deflection amount measuring element 12 reaches a predetermined value determined in advance according to the amount of deflection, the oil pressure is switched and the ram 6 is raised. With the above operations, one step of the correction work is completed.

Next, in order to confirm the correction result, the power steering pinion 9 is rotatably supported by the rotary indexing device 11, and the runout measuring element 13 is brought into contact with the power steering pinion 9. In addition, rotation
The power steering pinion 9 is rotated by the indexing device 11, and the amount of runout is measured by the amount of runout measuring element 13. If the measurement result is within the product tolerance, the process is finished; if it is outside the tolerance, the power steering pinion 9 is automatically installed with the convex side at the position where the amount of runout is the largest facing the ram 6. The subsequent correction work will be a repetition of the first correction work, so the following will be omitted.

By the above method, the power steering pinion
The fluctuation was corrected for 100 pieces. As a result,
In the conventional method, the correction rate was 20% to 30% and the breakage rate was 5% or more, but in this example, the correction rate was 98%.
The breakage rate was 0%.

From the above, it was confirmed that this example has excellent effects of significantly improving the correction rate and reducing the breakage rate. This is considered to be based on the fact that the measurement error of the amount of runout was significantly reduced.

Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, but includes various embodiments within the scope of the claims.

〔Effect of the invention〕

From the above, according to the control method of the automatic runout measurement and correction machine of the present invention, since the reference load is first applied and then zero set, even if foreign matter such as burrs exists at the measurement location, it will not be affected by it. do not have. Further, according to the control method of the automatic runout measuring and correcting machine of the present invention, the reference load is first applied and then zero-set, and thereafter, the deflection amount measurement head is used to measure the deflection amount until a predetermined deflection amount measurement value is reached. Since the correction load is applied and the shaft-shaped member is pressed and plastically deformed, when the standard load is applied, the shaft-shaped member moves due to the contact between the ram and the shaft-shaped member, and the amount of deflection is thereby reduced. Even if the measured value changes, the reference load is applied and the shaft-shaped member is zero-set in a state where it does not move easily, so the influence of the movement of the shaft-shaped member on the deflection amount measurement value is eliminated.
The amount of bending of the shaft-shaped member is accurately controlled by the deflection measuring element, and the amount of bending is not affected by burrs or the like. Therefore, there is no over-bending or unbending, and the correction rate for the run-out of the shaft-shaped member is greatly improved, and there is no breakage, etc., which provides excellent effects such as prevention of quality deterioration and cost reduction.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a state in which shake is being corrected by a control method for an automatic shake measuring and correcting machine according to an embodiment of the present invention. 1... Base, 2... Support, 3... Holder, 4
... Hydraulic cylinder, 5 ... Piston rod, 6 ...
...Ram, 7...Guide section, 8...Support stand, 9...
Power steering pinion (shaft shaped member), 1
0... cradle, 11... rotating/indexing device, 12
... Deflection amount measuring element, 13... Runout amount measuring element.

Claims (1)

[Scope of Claims] 1. Below the ram of the automatic runout measurement and correction machine, the part of the shaft-shaped member with large runout is supported at both ends facing the ram, and the part with large runout is pushed to the opposite side by the ram. A control method for an automatic runout measuring and correcting machine that corrects runout by plastically deforming the machine, the ram load of the automatic runout measuring and correcting machine being set to a reference load that does not bend the shaft-shaped member, and a reference load that does not bend the shaft-shaped member. Set two stages of correction loads to correct runout, first add a standard load, zero-set the deflection amount measurement value with the deflection amount measuring device in this state, then switch to the correction load and apply it to each shaft-shaped member. A control method for an automatic runout measurement and correction machine, characterized in that a shaft-shaped member is pressed and plastically deformed until a predetermined deflection amount measurement value is reached.