JPS606732B2 - Heading machine die pin damage detection device - Google Patents

Description

Detailed Description of the Invention The present invention is similar to headers and homers, in which a die pin is inserted into the back of the die forming hole so that it can move forward and backward, and the material loaded from the front of the forming hole is pressed with a punch to form a mold. The present invention relates to a device for detecting breakage of a die pin in a heading machine in which a shaped product is ejected to the front of the die by advancing the die spin.

First, the structure of the die part of the header will be explained based on FIG. A die 7 with a small-diameter forming hole 8 formed in the center is iron-fixed to the attachment hole 6 formed in the die block 4. The enlarged hook part 11 at the rear end of the die pin 10 inserted into the molding hole 8 from the rear side is tightly fitted into the large-diameter emotion guide hole 9, and the enlarged hook part 11 at the rear end of the die pin 10 inserted into the molding hole 8 from the rear side is tightly fitted. A cylindrical body 13 is iron-fitted into the stepped hole 12, and a first ejecting pin 16 with its tip facing the sliding guide hole 9 of the rear plate 5 is inserted into the center hole 14. The bulwarks 17 are tightly fitted together, and the elastic expansion force of the compression coil spring 18 installed between the enlarged diameter portion 17 and the rear plate 5 provides a rearward movement force. The center hole 2 of the sleeve 19 is screwed onto the female thread 15 formed at the rear of the center hole 14 and locked with a nut 23.
1 is filled with iron, and the tip of a protruding rod 22 is supported at the rear protruding end thereof, and furthermore, a punch 24 is attached to the tip of the ram 1 concentrically with the die 7, as shown by the solid line in the figure. As shown in , a material a of a certain size is loaded from the front side into the forming hole 8 of the die 7, and the punch 2 is pushed forward by the ram 1.
4, the die pin 10 and the first ejection pin 16 retreat one after another and stop at the position where they hit the sleeve 19, and the tip of the die pin 10 becomes the inner end of the forming hole 8, and the forging is completed. The total length of product b is determined, and as shown by the chain line in the figure, when the Ramu retreats, the ejector rod 22 moves forward, resisting the elasticity of the compression coil spring 18, and moves the first and second ejector pins. 1672, the die pin 10 moves forward until the enlarged diameter part turtle 1 touches the rear surface of the die 7, and repeats the operation of ejecting the product b to the front surface of the forming hole 8. The sliding guide hole 9 has a larger diameter than the forming hole 8 of the die 7 so as to fit closely with the enlarged diameter part 11 of the die pin Q, as shown by the solid line in the figure. If this happens, a considerable length of the material will enter the sliding guide hole 9 and become unrestrained, which may cause it to be damaged by the impact force of the punch 24.
In such a case, it is not only impossible to forge the finished product b, but also the punch 24 or die cannot be pressed by double punching. Therefore, it is necessary to detect damage to the die pin IQ and immediately stop the reciprocating movement of the ram groove.

For this reason, in conventional sho-zukuri machines, strain gauges are attached to parts that constitute the ejecting mechanism, such as the first ejecting pin 16, and the compressive force acting on the parts is measured, and damage to the die pin IQ is detected based on changes in the compressive force. Although this method was generally adopted, ``the compressive force that acts on the ejecting mechanism when pressing material a changes greatly due to slight differences in the diameter or length of material a, so it cannot be The indirect method has the drawback that damage to the die pin cannot be reliably detected.The purpose of the present invention is to eliminate this drawback and provide a device that directly detects damage to the die pin. It is something to do.

Hereinafter, one embodiment of the present invention will be described based on FIG. 2.

Note that parts having the same configuration as those in FIG. 1 are given the same symbols and explanations are omitted. 3 In this embodiment, a device hole 30 is provided in the rear plate 5 and is perpendicular to the sliding guide hole 9.
is formed, and a holder 33 equipped with a first reflective optical fiber sensor 32 pointing inside the sliding guide hole 9 is inserted into the device hole 30.
It is screwed into a female thread 31 formed thereon and locked with a nut 34, and the front end of the center hole 14 of the cylinder body 13 is a small diameter hole 39 having the same diameter as the sliding guide hole 9. A compression coil spring 18 is installed between the rear surface of the small diameter hole 39 and the widened part 17 of the first ejector pin 16, and is formed to reach the small diameter hole 39 from the outer periphery of the front end of the cylindrical turtle 3. A device hole 35 aligned with the through hole 38 is formed on the upper surface of the frame, and a second reflective optical fiber sensor 37, which is oriented toward the center of the female thread 36 and the through hole 38 formed in the tumor hole 35, detects flies. These first and second reflective optical fiber sensors 32, 37' are connected to a control device Kamegawa equipped with a light emitting element and a photoelectric conversion element, and this control device 4
0'koha~ An encoder 41 is connected to detect the phase of a crankshaft (not shown) that drives the ram shaft. To explain the operation of this embodiment, during normal operation, when the material a loaded into the forming hole of the die is pushed in by the advance of the punch 24, the die spins Q', as shown by the solid line in the figure. , in the retracted position, there is a central part in the length direction directly under the first reflective optical fiber sensor 32 and a widened part 7 directly under the second reflective optical fiber sensor 37. , the detection light emitted from each sensor 32?37 is reflected on the surface of the die pin 10 and is detected by each sensor 32, 3.
7, and the received light signal is converted into an electrical signal by the control device 48', thereby confirming that normal operation continues.

In addition, immediately after ejecting the product b after forging, the first and second
The ejector pins 16 and 2 move back due to the elastic expansion force of the compression coil spring 18, while the die pin Tsuru is made of the following material a.
is in the forward position until it is pushed in by the advance of the punch 2 turtle, and there is no die pin IQ directly under each sensor 32, 37, so each sensor 32, 37 does not receive reflected light temporarily. In terms of timing,
The detection operation is stopped by the signal from the encoder turtle 1.Next, if the die pin 10 is damaged due to excessive impact force or fatigue, it may break or bend, causing at least one of the sensors 32 , 37 or are facing diagonally, the amount of reflected light received by each sensor 32, 37 is significantly reduced compared to during normal operation, and this is detected by the control device 40. A signal is now being issued to suddenly stop Ram 1, the material supply layer, etc.

As specifically explained in the above embodiment, the die spin breakage detection device for a heading machine of the present invention inserts the die spin freely back and forth from the rear surface of the forming hole of the die, and inserts the material loaded from the front surface of the forming hole into the die spinner. Heading is performed by pressing with a punch attached to a ram facing the die, and the molded product is moved forward by pushing the die pin with an ejector pin that reciprocates in conjunction with a crankshaft that reciprocates the ram. In a heading machine in which the die protrudes from the front surface, a device hole is formed in the sliding guide portion of the die spin provided on the rear surface of the die, and is substantially orthogonal to the sliding guide hole, and the die pin is inserted into the device hole. A reflective optical fiber sensor is mounted in iron, and the optical fiber sensor and an encoder for detecting the rotation angle of the crankshaft are connected to a control device, and after the ejection pin retreats, the die pin is pushed by the material. The gist of the present invention is to detect the die spin with the optical fiber sensor except for the time until the die spin moves forward and the ejector pin moves back to the front of the optical fiber sensor. Since the detection operation is not performed during the time when no reflective object is present, damage to the die pin can be reliably detected and safe operation of the heading machine can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, and FIG. 2 is a sectional view of an embodiment of the present invention. 1... Ram, 2... Frame, 4... Dice flock,
5...' Rear plate, 7...Dice, 8...
...Forming hole, 9...Sliding guide hole, 10...Die pin, 11...Mineral section, 16, 21...
Ejection pin, 32, 37... Reflective optical fiber sensor 30, 35... Device hole, 40... Control device, 41... Encoder. Fig. 1 Fig. 2

Claims (1)

[Claims] 1. A die pin is freely inserted into the rear side of the forming hole of the die, and the material loaded from the front side of the forming hole is pressed with a punch attached to a ram facing the die to perform heading forming, and the ram is moved back and forth. In a heading machine, the molded product is ejected to the front surface of the die by pushing and advancing the die pin with an ejector pin that reciprocates in conjunction with a driven crankshaft. A device hole that is substantially orthogonal to the slide guide hole is formed in the sliding guide member, and a reflective optical fiber sensor that directs the die pin is fitted into the device hole, and the rotation angle of the optical fiber sensor and the crankshaft is adjusted. and an encoder for detecting is connected to a control device, and the optical fiber sensor is configured to detect the die spin after the ejection pin retreats, except for the time until the die spin is pushed by the material and retreats. Features a die spin breakage detection device for heading machines.