JPH076999Y2 - Forging load detection device for forging machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an apparatus for mainly detecting cold forging load of a forging machine for bolts, nuts and various other parts.

[Conventional technology]

A molding machine for forging a metal material such as a bolt has a predetermined size from the side by punching a punch on the front of the ram, which is normally in front of the die, against a forging die equipped on the front of the machine base. The material supplied as above is pressed into the required shape with the die and the punch.However, in order to perform such forming step by step from the raw to the fine, the above-mentioned die and punch are installed in parallel and the ram is retracted. It sometimes employs a multi-stage mechanism that pushes the material in the die forward and transfers it to the front of the next die while the ram moves forward.

By the way, if the above-mentioned feed material has defects such as flaws, distortions and other dimensional errors, hardness, or the material transfer is inconvenient, or the die or punch is cracked, forging failure occurs and high precision is achieved. Not only is it impossible to forge various parts, but it also damages the drive system of the machine. Therefore, conventionally, the punching load of the punch on the die is measured, and the machine is stopped when an abnormality occurs by catching the change in the punching load. A pressure sensor that converts a value into an electric signal and outputs the electric signal is used.

[Problems to be solved by the invention]

By the way, the pressure sensor used in the conventional pressure molding machine is provided with a punch in which the impact is momentarily strong and dynamically applied in the molding machine.
However, the position is also accommodated in the ram at the rear part of the axial center of the punch.

However, if the pressure sensor is provided in the ram, the punch case and other holders as well as the front punch must be individually attached and detached each time the sensor is assembled, inspected, repaired or replaced. Since the work must be done from the front of the ram, the work is very troublesome, and there is a drawback that the wiring cords vibrate violently as the ram moves back and forth, which can easily cause problems such as disconnection and connection failure. I am doing it.

The present invention addresses such a situation, and a pressure sensor is provided on the die wall, and a strain gauge block of the pressure sensor is provided in a space provided by opening an upper portion at a rear portion of the die block and a die case back portion is provided. By accommodating the strain gauge block together with the spacer to the upper part outside the machine by storing it in the front hollow part of the receiving spacer, it is easy to attach and detach the components and improve the durability of each part. The purpose is to measure.

[Means for solving problems]

The forging load detecting device of the forging and molding machine according to the present invention comprises a die block in the width direction of the back part, into the space provided by opening the upper part between the block and the load receiving plate at the rear part, and the die at the front part. A circular cutout portion having a large-diameter portion into which the rear portion of the case is fitted is formed, and a slime portion is formed on one side of the arc portion of the cutout portion and further opened to the outside above the slime portion. Spacers for each die case provided with respective clearances are accommodated so as to be detachable from the openings, and a strain gauge block is fitted in the hollow portion of each spacer. It is formed in a disk shape that can be tightly fitted from the front side of the die and cuts both sides, and the thickness is set within the front and rear width of the large diameter part so that the front side receives the rear side of the die case. Inside the hollowed out part The strain gauge block is fixed, and strain gauges are attached to both sides of the cut portion of the strain gauge block so that each lead wire can be taken out of the machine through the clearance portion, the clearance and the space. To do.

[Action]

The device according to the invention devises a fixed size material fed from the side of the machine to the front part of the die for each forward and backward movement of the ram into the opposing die by the punch of the forward ram, and when the ram moves backward, A desired molded product can be obtained from the final die by extruding the material and sequentially transferring it to the front of the next die. However, the punching load of the punch for the above material is detected by the strain gauge provided in the strain gauge block in the spacer accommodated from the upper part in the space between each die case and the rear load receiving plate, and the strain change is detected. It is converted into an electric signal and confirmed on the display panel outside the machine by the lead wire.
Appropriate measures can be taken when an abnormal load occurs.

〔Example〕

Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings.
In FIG. 3, reference numeral 1 is a machine base of the forging die of the forging machine A, and several die cases 4 in which the required dies 3 are fitted are provided at predetermined intervals in the die block 2 provided in the front part. Are stored in parallel and are fixed by set bolts 5, respectively. Reference numeral 6 denotes a ram which is in front of the die block 2 and moves back and forth with respect to the machine base 1. Through a punch holder 8 which is concentric with the dies 3 and fixed by several bolts 7, respectively. Punches 9 for pressing are individually held, and each time the ram 6 advances, the material supplied from the side is driven into the opposing die 3 to perform the required pressing, and the ram is further retracted. At this time, the KO pin 10 in the die 3 advances and pushes the forging material to the front part of the die. However, the material extruded to the front part of the die 3 is sequentially transferred to the front part of the next die by a chuck (not shown) which moves left and right every time the ram 6 moves back and forth. It is the same as the molding machine.

Reference numeral 11 is an appropriate depth between the rear portion of the entire width of the die block 2 supporting the die case 4 and the load receiving plate 1 ', and the upper portion is opened so that the space 12 can be attached and detached from above. It is a spacer that has a square shape (in the figure, shows a quadrangle with a diagonally cut corner) in the front view and has a through hole 11 'in the center. The spacer is as shown in FIGS. A large-diameter portion 11 into which the front portion of the die case 4 is fitted at the front inlet portion.
A circular hollow portion 11b defined as a and a slim portion 11c that communicates with one side of the arc portion of the hollow portion to the outside of the alligator are formed. Reference numeral 11d denotes a gap for opening the slime portion 11c upward, and 13 denotes a cover plate provided on the upper portion of the space 12. 14
Is a strain gauge block that constitutes a load cell in a pressure sensor provided for each unit of the individual die case 4, and the strain gauge block can be tightly fitted from the front of the hollow portion 11b of the spacer as shown in FIG. Both side surfaces of the disk body are cut in parallel 14a, and the thickness of the disk body is set so that the spacer 11 has a front surface portion for receiving the rear surface of the die case 4 when fitted to the hollow portion 11b. The thickness is set within the front-rear width of the large diameter portion 11a. Therefore, the strain gauge block 1 in the large diameter portion 11a is
A slight void B is formed on the outer circumference of the front portion of the No. 4 (Fig. 1). 14b is a through hole provided in the center of the strain gauge block, 14c is a lead wire insertion hole formed so as to communicate between the cut surfaces 14a, and 14d is a strain gauge block 14 fixed to the spacer 11. It is a screwing hole for the bolt. Reference numerals 15a and 15b are strain gauges attached to both side cut portions 14a of the strain gauge block 14 to detect a forging load applied to the die case 4. Lead wires 16a and 16b in each strain gauge are either lead wires. Through the hole 14c, the slack 11c provided on one side of the spacer 11 is taken out into the upper space 12 through the passage 11d that is converged by the loop, and the display panel or alarm device (not shown) provided outside the machine. ) Is connected to the strain gauges 15a and 15b to change the strain change due to the forging load of the die case 4 into a desired amount of electricity, and the output provides a digital display on the above display panel to detect an abnormal load. When it does, it activates an alarm or shuts down the machine.

In the case of the above configuration, the forging load applied to each die case 4 for each forward and backward movement of the ram 6 causes the strain gauge blocks 14
Is detected by the strain gauges 15a, 15b in, and the strain change is converted into an electric signal and individually displayed digitally on the display panel outside the machine by each lead wire 16a, 16b, and when an abnormal load is detected. Can activate an alarm or shut down the machine.

[Effect of device]

According to the present invention, the strain gauge block of the pressure sensor for detecting the forging load is housed in the hollow portion of the spacer provided so that it can be taken in and out from the upper part in the space between the die case and the rear load receiving plate. One of the lead wires taken out from the strain gauges on both sides of the gauge block is focused through a hole and a slot provided in the block, and this is taken out from the gap of the gauge block to the upper space. Can be quickly and easily attached and detached, and the lead wires for electrically connecting the strain gauge and the display panel outside the machine can be easily bundled and wired, and the vibration received by the lead wires is small The pressure sensor can be satisfactorily repaired and inspected without adverse effects, and the durability of each part can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a forging machine equipped with the device of the present invention by breaking it, FIG. 2 shows a strain gauge block (A) is a front view, (B) is a side view, and FIG. FIG. 4A is a front view of the strain gauge block, FIG. 4B is a side view thereof, and FIG. 4 is an assembled front view of the spacer and the strain gauge block. 1 is a machine base, 1'is a load receiving plate, 2 is a die block, 3 is a die, 4 is a die case, 6 is a ram, 9 is a punch, 11 is a spacer, 11a is a large diameter portion, 11b is a hollow portion, 11c. Is Numi, 11d
Is a space, 12 is a space, 14 is a strain gauge block, 14a is a cut portion, 14c is a hole, 15a and 15b are strain gauges, and 16a and 16b are lead wires.

Claims (1)

[Scope of utility model registration request] 1. A plurality of dies are provided in a die block at the front of the machine base, and a ram that moves back and forth in front of the block is provided with the same number of punches respectively facing each other. In the forging machine in which the forging material in the die is extruded to the front side of the ram and sequentially transferred to the front part of the next die, in the back width direction of the die block, the block and the back plate of the rear part In the space formed by opening the upper part between them, a circular hollow portion is formed in which a large diameter portion into which the rear portion of the die case is fitted is formed in the front surface portion, and an arc of the hollow portion is formed. A spacer is provided on one side of the die unit, and a spacer for each die case, which is provided with a clearance for opening to the outside above the clearance, is detachably accommodated in the opening. Fit a strain gauge block in the section In both cases, the strain gauge block is formed in a disk shape that can be tightly fitted from the front surface of the spacer, has both side surfaces cut, and has a thickness positioned within the front-rear width of the large diameter portion, and its front surface. Then, the rear surface of the die case is received in the state of being fixed, and the die gauge is fixed in the hollow portion.Strain gauges are attached to both side surfaces of the strain gauge block, which are the cut portions. A forging load detection device for a forging machine, which is adapted to be taken out of the machine through a gap and a space.