JPH042775Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is an automatic correction device that automatically corrects the grinding process of the grinding wheel by following the degree of wear of the grinding wheel when grinding a workpiece with a reciprocating grinding wheel. Regarding.

(Prior Art) In a conventional automatic correction device, as shown in FIG. 4, a plurality of first dots d1 to d1 are arranged opposite to first limit switches s1 to s1 in a feed unit U to which a grinding wheel t is attached. A plurality of second dots d2 to d2 are attached to the inspection arm k, facing the second limit switches s2 to s2, and arranged in the same way as the first dots d1. Attach the second dot plates p2 arranged in
is detected, and the feed unit U is switched from the fast feed state to the slow feed state when the first dot d1 corresponding to the second dot d2 comes into contact with the first limit switch S1 facing the first dot d1.

(Problem to be solved by the invention) In the case of the above mechanism, the distance between the tip of the grinding wheel t and the workpiece w (air cut amount) when the feed unit U moves to the shift position where the feed unit U is switched from the fast feed state to the slow feed state. changes in stages as the grinding wheel t wears out, and even though the grinding wheel t wears out in a stepless manner, the slow feed distance of the grinding wheel t gradually increases in response to the difference in level of each first dot d1. The grinding wheel t
Not only does the slow feed time increase and the cycle time of the grinding process increase, but also when the grinding wheel t is worn out and the time required to move the grinding wheel t in the cycle time exceeds the set limit, the degree of wear that can continue to be used will decrease. It was necessary to dispose of the whetstone t.

An object of the present invention is to provide an automatic correction device that solves the above problems.

(Means for Solving the Problems) The present invention provides a shift position for changing the forward speed of a grinding wheel rotatably supported by a reciprocating feed unit from a fast feed speed to a slow feed speed, and a shift position for changing the moving direction of the grinding wheel. A movable dog bar installed to be movable in the axial direction along the moving direction in order to set the direction change position respectively, and the amount of wear of the grinding wheel when the feed unit is stopped are measured and the measurement results are obtained. a measuring member installed so as to be movable back and forth in the moving direction in order to transmit the information to the movable dock rod;
The measuring member includes a detecting portion which is placed opposite to the grindstone in order to come into contact with the grindstone during the forward movement of the measuring member to define the forward end of the measuring member, and a detecting portion which is placed opposite to the grindstone in order to define the forward end of the measuring member while the measuring member is moving forward. a pushing part opposite to the movable dowel rod for correcting the rapid feed stroke of the grindstone based on the amount of wear of the grindstone by pushing the movable dowel stick by the displacement of the forward end of the measuring member; The gist is an automatic correction device for the grinding process that is also equipped with the following.

(Function) The device of the present invention detects the amount of wear on the grindstone by bringing the detection part of the measurement member into contact with the grindstone during the forward movement of the measurement member, and at the same time detects the amount of wear on the grindstone. The movable dot rod for setting the direction change position where the moving direction of the grinding wheel is changed is pushed in the moving direction of the grinding wheel by the pushing part of the inspection member by the amount of increase in the amount of wear of the grinding wheel. It is configured to automatically correct the rapid feed stroke in accordance with the wear and tear of the grindstone.

(Example) Next, an example of the present invention will be described with reference to the drawings.

A feed unit 1 has a disk-shaped grindstone 2 rotatably supported on one side for grinding a workpiece W (in this example, a torsion bar serving as an automobile part is illustrated).
is supported so as to be slidable in the horizontal direction on slide bars 4, 4 which are horizontally suspended in parallel via a pair of front and rear support members 3, 3. It is connected to the piston shaft 5a of the installed first cylinder 5 and reciprocates with the piston shaft 5a, and is set to move forward by changing the speed from a fast traverse speed to a slow traverse speed on the outward journey, and to move backward at a fast traverse speed on the return journey. There is. and,
Near the rear end of one side of the feed unit 1, there is a first cylinder 5 that comes into contact with a detection member 6 attached to the rear support member 3 when the feed unit 1 moves to the rearward end.
The first
A limit switch 7, and a second limit switch 8 for switching the piston shaft 5a from an accelerating movement state to a decelerating movement state and converting the forward speed of the feed unit 1 and the grinding wheel 2 from a fast feed speed to a slow feed speed for grinding. , and a third limit switch 9 for defining the forward end of the piston shaft 5a, which moves forward in a decelerated state, and for changing the moving direction of the feed unit 1, are installed in order from the rear.

A movable dock rod 10 suspended horizontally along the side edge of the feed unit 1 is supported so as to be forcibly movable in the axial direction with respect to the front and rear support members 11, 11, and is screwed into the rear support member 11. A braking spring (not shown) is interposed between the screw 12 and the movable dock rod 10, and is pressed in the cross-sectional direction to restrict movement in the axial direction. And movable dock stick 1
The operating piece 8a of the second limit switch 8 is connected to the cam 10a fitted on the front part of the feed unit 1.
near the end of the forward stroke of the feed unit 1 to switch the contact point of the second limit switch 8.
The first cam surface 13 for setting the shift position H1 where the speed is changed from the fast feed speed to the slow feed speed, and the operating piece 9a of the third limit switch 9 are pushed up at the forward end of the feed unit 1 to switch the third limit switch 9. A second cam surface 14 connected in front of the first cam surface 13 is formed to set a direction change position H2 at which the feed unit 1 and the grinding wheel 2 change direction from the forward state to the backward state. As the movable dowel rod 10 moves in the axial direction, both cam surfaces 13 and 14, which set the speed change position H1 and the direction change position H2 of the feed unit 1 and the grindstone 2, are displaced.

Before each reciprocating movement of the feed unit 1 with the feed unit 1 stopped at the backward end, the grinding wheel 2 is
Measure the amount of wear S and send the measurement results to the movable dock rod 1
The measuring member 15, which is disposed horizontally along the width direction of the feed unit 1 and opposite to the feed unit 1, is connected to the piston axis of the second cylinder 16, which is arranged above the first cylinder 5. 16a,
Each time the feed unit 1 stops, it is reciprocated together with the piston shaft 16a. A grinding wheel is provided at both ends of the measuring member 15 in order to define the forward end of the measuring member 15 in accordance with the wear amount S of the grinding wheel, which is in contact with the stopped grindstone 2 during the forward movement of the measuring member 15. 2 and is biased forward by a spring.
A pushing part 1 is disposed opposite to the movable dock bar 10 in order to push the movable dock bar 10 forward by the displacement of the forward end of the testing member 15 each time the testing member 15 moves forward.
8 are installed together, and when the measuring member 15 is stopped at the retreat end, the distance A between the detection section 17 and the rear end surface of the grinding wheel 2 and the distance between the rear end surface of the movable dog bar 10 and the pushing section 18 are Always of equal length. Further, as the grinding wheel 2 is worn out and the diameter of the grinding wheel 2 decreases, the forward end of the inspection arm 15 is gradually displaced forward, and the movable dog bar 10 is repeatedly pushed forward, and the first cam surface 13
And the second cam surface 14 is gradually displaced forward.

Then, the reference rapid traverse stroke in which the non-consumable grinding wheel 2 advances at a rapid traverse speed from the start position H0 to the shift position H1 is set as D0, and the grindstone 2 moves to the shift position H1.
Assuming that the slow feed stroke (air cut amount) that advances at a slow feed speed from to the direction change position H2 is D2 (in this example, D2 is set to 4 mm), during the forward movement of the grinding wheel 2, the worn out grinding wheel 2 is fast fed. Stroke D1 is D0
+S and gradually increases following the increase in the amount of wear S of the grindstone 2, but the slow feed stroke D1 for grinding the workpiece W remains constant.

The consumption amount S of grindstone 2 is the preset limit consumption amount.
In order to push the movable dock bar 10 back to its original position when reaching Sn, a third cylinder 19 placed opposite the movable dock bar 10 is fixed to a bracket 20 attached to one side of the front end of the feed unit 1. Whetstone 2
When the wear amount S reaches the limit wear amount Sn and the grinding wheel 2 moves forward to the shift position H1 with the rapid feed stroke D1 of the grinding wheel 2 becoming D ₀ +Sn, the bracket 20
The contact portion 20a formed at the tip of the bracket 20
4th limit switch 2 installed in front of the passage
By switching the contact No. 1, a lamp (not shown) for predicting grindstone replacement is lit. Then, when the operator confirms that this lamp is lit and presses a push button switch (not shown), the piston shaft 19a of the third cylinder 19 moves forward, and the movable dock rod 10 is pushed rearward to its original position. At the same time, the front contact piece 22 of the interlocking member 22 attached to the piston shaft 19a
At step a, the contact point of the fifth limit switch 23 is switched and the piston shaft 19b moves back from the forward end, and at the backward end, the rear contact piece 22b switches the sixth limit switch 2.
4 is switched, the lamp is turned off, and the measuring member 15 and the feeding unit 1 are held in a stopped state, and the grindstone 2 can be replaced in this state.

Next, the operation and effects of the embodiment having the above configuration will be explained.

First, prior to the reciprocating movement of the feeding unit 1, the second cylinder 16 is driven to reciprocate the measuring member 15. When the measuring member 15 moves forward, the detecting part 1
7 is in contact with the grindstone 2 to define the forward end of the measuring member 15, and the pushing part 18 is in contact with the movable dog bar 1.
0 by the displacement of the forward end of the measuring member 15, the first cam surface 13 and the second cam surface 14 of the movable dowel rod 10 are displaced forward by the amount of increase in the wear amount S of the grindstone 2.

Next, after the measuring member 15 has retreated, the first cylinder is driven to reciprocate the feed unit 1, and the grindstone 2 moves from the starting position H0 to the speed change position where the second limit switch 8 abuts the first cam surface 13. It moves forward at a rapid traverse speed to H1, then moves forward at a slow traverse speed from shift position H1 to position H2, where the third limit switch 9 contacts the second cam surface 14, changes direction, and moves to the start position H at a rapid traverse speed.
Back up to 0.

Then, when the reciprocating movement of the measuring member 15 and the reciprocating movement of the feeding unit 1 are repeated alternately, as the grinding wheel 2 wears out, the rapid feeding stroke D of the grinding wheel 2 increases.
1 increases steplessly by the increase in the amount of wear S of the grindstone 2, and the slow feed stroke D2 is always kept constant.

Therefore, the measurement result of the wear amount S of the grinding wheel 2 can be directly transmitted to the movable dock rod 10 to accurately set the grinding stroke of the grinding wheel 2, and during the grinding stroke of the grinding wheel 2,
It is possible to eliminate the problem of increasing the required round trip time of the grinding wheel 2 due to an increase in the slow feed stroke or gradual changes.
The grinding wheel 2 can be efficiently reciprocated to improve the efficiency of the grinding process, substantially shortening the cycle time of the grinding work, and further extending the wear limit of the grinding wheel 2, thereby making it possible to grind a workpiece with one grinding wheel 2. This has the effect of increasing the number of pieces and the number of times of effective use, and ultimately reducing the cost required for grinding.

In addition, in the past, the direction change position of the feed unit was controlled based on changes in the grinding load current, which caused a problem of large variations and lack of reliability, but in this example, the third limit switch 9 controls the direction change position of the feed unit. In order to change the direction of the grinding wheel 1 and to set the direction change position, the second cam surface 14 is displaced based on the measurement result of the amount of wear of the grinding wheel 2.
can be set accurately to eliminate variations and increase the reliability of the grinding stroke setting mechanism.

(Effect of the invention) In other words, the present invention provides a speed change position for changing the forward speed of a grindstone rotatably supported by a reciprocating feed unit from a fast feed speed to a slow feed speed, and a direction change for changing the moving direction of the grindstone. A movable dowel rod is installed so as to be movable in the axial direction along the moving direction to set the respective positions; A measuring member installed so as to be able to reciprocate in the moving direction in order to transmit the information to the dog bar is installed oppositely, and the measuring member is provided with a measuring member that contacts the grinding wheel during the forward movement of the measuring member, and a detection unit placed opposite to the grindstone to define the forward end of the inspection member;
The movable dot is moved in order to correct the rapid feed stroke of the grindstone based on the amount of wear of the grindstone by pushing the movable dot rod by the displacement of the forward end of the test member each time the inspection member moves back and forth. By installing a pushing part opposite to the rod, the grinding process can be made more efficient and the cycle time of the grinding work can be shortened, and the wear limit of the grindstone can be extended to reduce the cost required for the grinding process. It has a moisturizing effect.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention; Figure 1 is a plan view, Figure 2 is a perspective view, Figure 3 is an explanatory diagram of the grinding process, and Figure 4 is a conventional automatic FIG. 3 is a schematic plan view showing the correction device. DESCRIPTION OF SYMBOLS 1... Feeding unit, 2... Grinding wheel, 10... Movable dock bar, 15... Inspection member, 17... Detection part, 18... Pushing part, H1... Shift position, H2...
...turning position.

Claims (1)

[Scope of utility model registration request] The above-mentioned movement is performed in order to respectively set a shift position where the forward speed of the grinding wheel rotatably supported by a reciprocating feed unit is changed from a fast feed speed to a slow feed speed, and a direction change position where the moving direction of the grindstone is changed. a movable dot rod installed so as to be movable in the axial direction along the direction; A measuring member installed so as to be movable back and forth is provided oppositely to the measuring member, and the measuring member is provided with a measuring member for defining the forward end of the measuring member by coming into contact with the grindstone during the forward movement of the measuring member. A detection unit placed opposite to the grindstone moves the movable dog bar by the amount of displacement of the forward end of the measurement member every time the measurement member moves back and forth, thereby reducing the wear and tear of the grindstone during the rapid forwarding stroke of the grindstone. 1. An automatic correction device for a grinding process, characterized in that a pushing part placed opposite to the movable dowel rod is provided for correction based on the amount.