JPS60135378A - Control method of automatic crawler press-in device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of variations in press-in force, by installing a press-in detecting device in a press-in jig in having an eye to a fact that a spring-back value is proportional to the press-in force, while making it so as to press in a pin upon estimating the spring-back value from this press-in force detecting device. CONSTITUTION:First and second strain gauges 22 and 23 are attached to a bush press-in jig 10 at both side, while third and fourth stain gauges 24 and 25 are attached to a pin press-in jig 8 at both sides likewise. These first to fourth gauges 22, 23, 24 and 25 are connected with one another in a bridge type way. From each output of these third and fourth gauges 24 and 25, a press stop position estimating the sping-back value is calculated at operation parts 27 and 28, while this calculated value P is compared with an output value Q of a hole pitch sensor 11 by a comparator 30, and at that point that both values accord with each other, a press is stopped. In this connection, press-in operation at the bush side comes to an end with a confirmation that the bush press-in jig hits the bush end face.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of controlling an automatic Ji7 band press-in device.

As shown in FIGS. 1 and 2, the B band used in pull dozers, power shovels, etc. is composed of a link 1, a bin 2, a pusher 3, a seal 4, a shoe, etc. The inner link 1, pin 2, and pusher 3 are press-fitted together using a press-fitting device.

During the press-fit assembly process, it is necessary to set the ▲ dimension (hole pitch of the shoe mounting bolt holes) shown in Figure 1 and the H dimension (push protrusion amount) shown in Figure 2 within the standard dimensions. .

When press-fitting into the link LI pin 2 and push 3, as shown in FIG.
is moved forward, and the link 1 is press-fitted into the pin 2 and the pusher 5.3 using the bottle press-fitting jigs 7 and 8 provided on the left and right press-fitting heads 5.6 and the push-fitting jig 9.10. In this case, the hole pitch sensor 11 of the shoe mounting bolt hole constantly measures the hole pitch of the link 1 during press-fitting, and when the value reaches a reference value, a control box 14 is sent to the depressurized pulp 13 provided on the press ram 12. By sending an activation signal and removing the hydraulic pressure from the press ram 12, the repress was stopped and the press-fitting of the pipe was completed.

According to this method, is it possible to determine the hole pitch accuracy at the completion of press-fitting with high accuracy?When the press-fit is completed, the left and right press-fit heads 5 and 6 are moved back to release the press force, and the workpiece springs. There was a drawback that the hole pitch changed compared to the bypass yyrtc.

The workpiece has allowable dimensional errors, so the press-fitting allowance changes. Therefore, the pressing force differs for each workpiece,
Since the amount of springback is not constant, the hole pitch dimension A
This was due to variations in the number of parts, leading to deterioration in assembly accuracy.

The present invention has been developed in view of the above circumstances, and its purpose is to provide a press-fitting jig with a press-fitting force detecting means and to detect the press-fitting force by paying attention to the fact that the amount of springback is proportional to the press-fitting force. The purpose of the present invention is to predict the amount of springback from the press force applied by the means, completely determine the press fit completion position, complete the press fit, and absorb the spring back caused by variations in the press force to improve press fit accuracy.

Hereinafter, the present invention will be explained with reference to the drawings.

The bushing press-fitting jig 10 has 1% second strain gauges 2 on the left and right.
2.23 is glued, and third and fourth strain gauges 24s25 are glued on the left and right sides of the bottle press-fitting jig 8, and these first to fourth strain gauges 22, 23, 24, and 25 are glued to the bottle press-fitting jig 8. They are connected in a brittle style as shown in the figure.

Press-fitting control on the pin side is performed as shown in the block diagram shown in FIG.

That is, in FIG. 6, 26 is a press force detection section,
These are the third and fourth strain gauges 24.2 of the pin press-fitting jig 8.
This is the output from 5. 27 is an arithmetic unit which calculates the amount of springback. 28 is the 4th part of the entrainment,
This tl performs all settings of the large pitch reference value. 29 is a hole pitch detection section, 11 is the output of the hole pitch sensor, 030 is a comparison section, 31 is an output section, and fl is for issuing an activation signal to the pressure relief valve 13.

Therefore, the outputs from the third and fourth gauges 24, 25, that is, the press-in force measurement values in the press-fitting process are used in the calculation units 27, 2.
8 springback i-? Calculate the expected and appropriate press stop position, and use this calculated value P and the hole pitch sensor 11.
The output value Q is compared with the output value Q by the Hiei device 3o, and when they match, the output section 31 sends an operating signal to the pressure relief valve i3 at full speed to stop the press.

Further, press-fitting on the bushing side can be confirmed by checking that the bushing press-fitting jig 10 has hit the bushing end face, so check from the rate of change of the pressing force using the block diagram shown in FIG. 7.

That is, in FIG. 7, 32 is a press-fit detection section.
This is the output from the first and second strain gauges 22 and 23.

33 is a differential circuit section, and tl measures the rate of change. 3
4 is a reference voltage section, and n sets a reference voltage as a threshold value f. 35 is a comparison section 1, and 36 is an output section.

Then, the press force sensor a32 detects the entire press force force on the bushing side, and from this detected value, the differential circuit section 32 compares the output value P' and the reference voltage value Q' as a threshold value to determine the rate of change. 35, and when they match, a press-fitting completion signal is output from the output section 3o at the point π? Entering and exiting the press.

The present invention has been described in detail above, and during the press-fitting process, all appropriate press stop positions are calculated, taking into account the amount of springback, from the press-force measurement value of the press-in force measuring means provided on the press-fitting jig, and the shoe port is attached. All the output values from the hole pitch measuring means are compared, and when they match, a press stop signal is output to the press stop means, and the press stops. Since it is stopped, it is possible to absorb changes in the amount of springback caused by variations in pressing force, and improve press-fitting accuracy.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the formation of the abdominal belt, Figure 2 is a cross-sectional view of the same, Figure 3 is the 8Q diagram of the formation theory of the automatic crawler press-fitting press, Figure 4 is an explanatory diagram of the press-fitting jig, and Figure 5 is the distortion FIG. 6 is a block diagram for explaining a control method according to an embodiment of the present invention, and FIG. 7 is a block diagram for explaining a bush side press-fitting control method. 5 is the left press-in head, 6 is the right in/out head, 7°g is the bottle press-in jig, 9. IO is a bushing press fitting jig, 11 is a hole pitch sensor, 22, 23° 24.25 are 1st, 2nd, 3rd
, the fourth strain gauge. Applicant: Komatsu Ltd. Agent: i±Masaaki Yonehara Patent Attorney: Tadashi Hamamoto Figure 1 Figure 2 Figure 3 Figure 4 Figure 10 Figure 5

Claims (1)

[Claims] Pressure force measuring means rc installed on the press-fitting jig during the press-fitting process
Springback 1・i was estimated from the press-fit measurement value,
Did you calculate all the appropriate press stop positions, compare them with the specific force values measured by the hole pitch measuring means for the shoe bolt mounting holes, and output a press stop signal to the press stop means when they match? A method of controlling an automatic crawler press-fitting device with a % characteristic.