JP3139658U - Forging machine - Google Patents

Abstract

Punch folding can be inspected during the retraction operation of a punch after molding, and molding failure of a next molded product or damage to a mold due to folding of the punch is prevented.
A material having a predetermined shape is formed by forging a material with a die provided on a machine base and a punch provided opposite to the front of the die and moving forward and backward through a ram. In a forging machine for forming a molded product, a rocking sensor 11 detects the breakage of the punch 6 from the amount of rocking contact with the outer surface of the punch 6 that moves backward after the material is formed by the punch 6 at the front surface of the die 4. A punch breakage detector 10 equipped with
[Selection] Figure 2

Description

  The present invention forms a product of a predetermined shape by forging a material with a die provided on a machine base and a punch provided to face each other in front of the die and move forward and backward through a ram. The present invention relates to a pressure forming machine.

Technical background

  Conventionally, in this seed forging machine, as a means for detecting an abnormality due to punch breakage during forging with a die and a punch, for example, a forging load detector for detecting a forging load during forging is provided, It is known to provide a sensor system that detects a punch abnormality due to a fluctuation in a forging load by a detector and stops the operation upon detection.

  By the way, in the sensor system described above, when a molded product with a large volume or a small volume is molded, it works effectively when the forging load fluctuates due to a defective setup of the tool. If it breaks at, it will not work because there is no load fluctuation. For this reason, the next material was forged with a punch that was broken, and the machine was stopped by detecting fluctuations in the forging load caused by breakage of the punch. there were. In particular, in a multi-stage forging machine, when forming an intermediate molded product having a hole on the front side, if a part of the punch is folded into the hole of the molded intermediate molded product, The folded intermediate molded product is forged in the next process as it is, and the operation of the forging machine is stopped by detecting fluctuations in the forging load generated when the punch in the next process is broken. For this reason, there is a problem of inducing damage to the die and the chuck for transferring the material as well as the punch in the next process.

  Therefore, the present invention is a forging machine that can inspect the folding of the punch during molding during the retraction operation of the punch after molding, and can prevent the molding failure of the next molded product or damage to the mold due to the folding of the punch. Offering is an issue.

  In order to solve the above problem, the invention described in claim 1 of the present application includes a die provided on the machine base, a punch opposed to the front of the die and provided to advance and retreat via a ram. In a forging machine that forms a product of a predetermined shape by forging the material with a die, the punch breaks due to the rocking condition by contacting the outer surface of the retreating punch after forming the material with the punch at the front surface of the die A punch breakage detector provided with a swing sensor for detecting the above is provided.

  Further, the invention described in claim 2 of the present application is that, in the configuration of claim 1, the punch breakage detector is swingably supported by a pivot provided on the front surface of the die, and the outer surface of the punch by the biasing means. And a proximity switch that is provided on the die block and detects a punch breakage by detecting a change in the swing amount of the swing sensor during a certain time when the punch moves backward after molding. It is characterized by providing.

  With the above-described configuration, the present invention can inspect whether the punch is folded during molding during the retraction operation of the punch after molding, and can prevent molding failure of the next molded product or damage to the mold due to punch folding. In particular, when a part of the punch is folded into the hole of the molded intermediate molded product, the transfer of the intermediate molded product with the punch folded to the next process is stopped, and the punch or It is possible to prevent damage to the mold and the chuck for transferring the material.

  Moreover, the punch breakage detector is composed of a swing sensor and a proximity switch, and the swing sensor is provided on the front face of the die and the proximity switch is provided on the die block, so that the attachment and detachment of the die and punch can be prevented. It can be attached and detached smoothly. Further, the punch breakage detector can be easily attached to the front surface of a die and a die block in an existing forging machine, and can be easily and accurately set.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a schematic view of a multi-stage forging machine. A plurality of dies 4... 4 are arranged at regular intervals on a die block 3 mounted at a predetermined position of a machine base 2 in the forging machine 1. It is held side by side. The machine base 2 is provided with rams 5 that move forward and backward with respect to the dies 4... 4, and the same number of punches 6. 7 to 7 are arranged opposite to each other. In this case, the die 4... 4 and the punches 6. Further, a material transfer chuck 8 is provided at a position immediately before each of the dies 4... 4 for feeding a material as shown in FIG. And the forging performed between the dies 4... 4 and the punches 6... In association with the forward and backward movement of the punches 6... 6 with respect to the dies 4. By the molding, the supplied material is gradually molded into a cylindrical product. The material transfer chuck 8 has the same configuration as that of the existing transfer chuck, and a specific configuration and operation thereof will be omitted.

  As shown in FIGS. 2 and 3, after the material is formed by the punch 6 at the front surface of the die 4, the abutting against the outer surface of the retreating punch 6 and detecting the breakage of the punch 6 from its swinging condition. A punch breakage detector 10 provided with a motion sensor 11 is provided.

  The punch breakage detector 10 is supported by a pivot 12 provided on the front surface of the die 4 so as to be swingable. The swing sensor 11 is urged by a leaf spring 13 to contact the outer surface of the punch 6; Provided in the block 3 is a proximity switch 14 that detects a change in the swing amount of the swing sensor 11 and detects breakage of the punch 6 during a fixed time after the punch 6 moves backward after molding. The detection timing of the proximity switch 14 is, for example, that a camshaft (not shown) that rotates in conjunction with a drive system that moves the ram 5 back and forth is provided, and the punch 6 is moved backward by a cam provided on the camshaft. The proximity switch 14 is operated in accordance with the timing to detect a change in the swing amount of the swing sensor 11. Then, the swing sensor 11 swings from the contact position with the outer surface of the punch 6 to the center side of the punch 6 for a certain time during which the punch 6 moves backward by the punch breakage detector 10, and the punch 6 is damaged. Is detected, a breakage detection signal is appropriately output from a punch breakage detector 10 to control means (not shown), and the operation of the forging machine 1 is stopped by the control means.

  The swing sensor 11 has an inverted L shape, and a central portion thereof is supported by the pivot 12 so as to be swingable. A roller 15 is provided at one end of the contact side with the punch 6 and the other end is a die. 4, the sensor 11, that is, the roller 15 is controlled to swing toward the center of the die. The stopper shaft 16 is provided with a leaf spring 13 that biases the roller 15 of the swing sensor 11 toward the center of the die 4.

  Here, the swing sensor 11 is normally urged toward the center of the die 4 by the leaf spring 13, but when the material, the intermediate molded product or the punch 6 passes over the roller 15, it resists the leaf spring 13. Thus, the sensor 11 swings outward in the radial direction of the die 4. That is, when the roller 15 rides on the outer surface of the material, intermediate molded product or punch 6, the sensor 11 and the material, intermediate molded product or punch 6 do not interfere with each other to cause a problem in the movement. It has a structure.

  3 and 5, reference numeral 17 denotes a knockout pin that pushes the intermediate molded product A forward of the die 4 after the punch 6 has been retracted.

  Next, the operation of the forging machine configured as described above will be described.

  When the punch 6 is driven into the die 4 to form the intermediate molded product A and the punch 6 moves backward from the die 4, the punch breakage detector 10 changes the swing amount of the swing sensor 11 relative to the proximity switch 14 for a certain time. inspect.

  As shown in FIGS. 2 and 3, when the punch 6 is not damaged, the roller 15 of the swing sensor 11 remains in contact with the outer surface of the punch 6, so that the other end of the swing sensor 11 is The state where the fixed distance is maintained with respect to the proximity switch 14 is maintained until a certain time for the punch 6 to retreat elapses. In this case, the punch breakage detector 10 determines that the punch 6 is not broken and is normal, and a breakage detection signal is not output from the punch breakage detector 10 to the control means as appropriate, and normal operation continues. Done.

  On the other hand, as shown in FIGS. 4 and 5, when the punch 6 is broken and a part 6 a of the punch 6 remains in the hole a of the intermediate molded product A, the swing sensor 11 has the roller 15 at the center of the die 4. The other end of the swing sensor 11 is further away from a reference position that is a fixed distance away from the proximity switch 14 while the fixed time for which the punch 6 moves backward (for example, 0). About 5 mm). In this case, the punch breakage detector 10 determines that the punch 6 is broken, outputs a breakage detection signal from the punch breakage detector 10 to the control means as appropriate, and stops the forging machine 1 operation. .

  As described above, the folding of the punch 6 at the time of molding can be inspected by the punch breakage detector 10 provided on the front side of the die 4 during the backward movement of the punch 6 after molding. It is possible to prevent molding defects and damage to molds. In particular, when a part 6a of the punch 6 is folded in the hole a of the molded intermediate molded product A, the transfer of the folded intermediate molded product A to the next process is immediately stopped. It is possible to prevent breakage of the die 4, punch 6, and material transfer chuck 8.

  In addition, since the swing sensor 11 of the punch breakage detector 10 is provided on the front surface of the die 4 and the proximity switch 14 is provided on the die block 3, the attachment and detachment of the die 4 and the punch 6 can be performed without hindering. It can be done smoothly. Further, the punch breakage detector 10 can be easily attached to the front surface of the die 4 and the die block 3 in an existing forging machine, and can be easily and accurately set.

  In the embodiment shown in the figure, in the multi-stage forging machine, when the cylindrical intermediate molded product A having a hole in the center is formed on the front side, the molded intermediate molded product A Although the case where a part 6a of the punch 6 is folded into the hole a has been described, it is not limited to a die and a punch for forming a molded product having such a special shape. Breakage of the punch 6 may be detected by using a normal die and punch for forming an intermediate intermediate product, or all or some of the forging stations in a multistage forging machine. Of course.

  Further, in the embodiment shown in the figure, the swing sensor 11 having the roller 15 at one end is used, but the swing sensor itself is integrally formed by a leaf spring, and the pin that does not require the roller 15 is used. A structure formed by a spring may be used.

  1 is a schematic plan view of a forging machine according to the present invention.   It is a front view of the principal part.   It is a partially cutaway side view when the punch is normal.   It is a front view at the time of the same punch fracture.   It is a partially cutaway side view at the time of the punch fracture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Forging machine 2 Machine stand 4 Die 5 Ram 6 Punch 10 Punch break detector 11 Swing sensor

Claims (2)

  In a forging machine that forms a product of a predetermined shape by forging a material with a die provided on a machine base and a punch provided to face each other in front of the die and move forward and backward through a ram The punch breakage detector is provided at the front surface of the die with a swing sensor that detects the breakage of the punch from the swinging state by contacting the outer surface of the retreating punch after forming the material with the punch. Forging molding machine.   The punch breakage detector is swingably supported on a pivot provided on the front surface of the die, and is provided on a die block and a swing sensor that is biased to abut against the outer surface of the punch by a biasing means, 2. The forging machine according to claim 1, further comprising a proximity switch that detects a change in the swing amount of the swing sensor and detects breakage of the punch during a predetermined time during which the punch moves backward after molding.

Images