JPH077000Y2 - Forging load detection device for forging machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a forging load detection device of a forging machine, which is designed to forge parts such as bolts and nuts from a metal material.

[Prior Art] Generally, in this type of forging machine, a plurality of dies are installed in parallel on a machine base, and a ram that moves forward and backward relative to the dies in front of the dies of the machine base faces each die. When the ram moves forward, the punch drives the material into the die, and when the ram moves backward, the material is extruded from the die and transferred to the front side of the next die. By repeating the process from the die to the final die and gradually forging the material from coarse to fine, a forged product having a predetermined shape is obtained.

In the case of such a press molding machine, there are flaws, distortions and dimensional errors in the supplied material, there is a problem with hardness, there is a problem in transferring the material to the next die, and there is cracking in the die and punch. If it occurs, not only will the forging fail, and a highly accurate forged product will not be obtained, but also the drive system of the machine may be damaged.

Therefore, in the above forging machine, the punching load of the punch on the die is measured by the sensor on the punch side, and the change in the measured value is monitored so that the machine operation is stopped immediately when an abnormality occurs. Is being carried out.

Conventionally, as a forging load detection device such as this,
No. 2 publication is known, and as shown in FIG. 4, two spacer rods 3 and 4 are coaxially arranged in the front and rear at a rear portion of a punch 2 mounted on a ram 1 which moves back and forth. At the same time, the rear end of the rear side spacer rod 4 is in contact with the flat surface portion 5a of the adjusting rod 5 for obliquely adjusting the punch protrusion amount, which is obliquely mounted on the ram 1, and the spacer rod 4 is provided. The strain sensor 6 was adhered to the ram 4, and the lead wire (not shown) of the strain sensor 6 was configured to be led out of the ram 1 through a guide hole 7 that is vertically provided in the ram 1. 8 is a die mounted on the machine body 9.

With such a configuration, when the ram 1 advances and the punch 2 drives the material A into the die 8, the driving reaction force acts on the punch 2 and the front and rear spacer rods 3, 4. . Therefore, the punch 2 and the front and rear spacer rods 3 and 4 are distorted by the compressive force thereof, and the strain amount generated in the rear spacer rod 4 is detected by the strain sensor 6, and the detected value is detected by the lead wire. After that, it is input and displayed on an external display panel (not shown).

[Problems to be solved by the invention] By the way, in such a forging load detection device, since the striking force is applied to the strain sensor or the like each time the punch is driven, a strain sensor failure or a lead wire disconnection may occur. It is easy to occur, so frequently check the strain sensor etc.,
It is necessary to repair and replace it. In recent years, in order to detect more subtle changes in forging force, the strain sensor mounting block (in the case of the above-mentioned conventional device, depending on the shape and size of the parts to be forged, that is, according to the size of the forging load, The rear spacer rod 4) is replaced with a material made of an optimum material for strain generation and forging is performed.

In that case, in the above-mentioned conventional device, after removing the punch 2 from the front surface of the ram 1 each time, the front and rear spacer rods 3 and 4 must be pulled out, and the lead wire of the strain sensor 6 must be pulled out from the guide hole 7. Since it is necessary to perform the reverse operation to the above when assembling, it is very troublesome to inspect, repair and replace the strain sensor and the spacer rod (block) 4. Not only that, the work for removing the punch 2 and the work for extracting the spacer rods 3, 4 have to be performed in a narrow space between the ram 1 and the die 8, so that the work cannot be performed quickly.

[Means for Solving Problems] The present invention has been made in order to solve such a conventional drawback, and the purpose thereof is to attach and detach a block having a strain gauge attached thereto from an upper portion of a ram. It is an object of the present invention to provide a forging load detecting device for a forging machine, which is configured so that inspection, repair, replacement of a strain gauge or the like, or replacement of a block can be performed easily and quickly.

That is, according to this invention, in order to achieve the above-mentioned object, a machine is equipped with a die, and a ram that moves forward and backward with respect to the die is provided in front of the die, and a punch is mounted on the ram. At the same time, a block to which a strain gauge is attached is arranged at the back of the punch, and a load receiving plate for receiving the force received by the punch through the block when the material is driven into the die is provided at the rear of the block. In a press forming machine configured to detect a strain amount of the block by a strain gauge when the material is punched into the die by punching the material into the die, the block is a top surface of the ram. The punch and the load receiving plate are arranged between the punch and the load receiving plate by being inserted into the space vertically provided in the ram from the upper opening thereof. Leads of said strain gauge is obtained so as to be led to the outside from the upper opening of the space is attached to the block.

[Operation] Since the ram is moved forward as described above, the punch drives the material into the die, and the reaction force (compressive force) acts on the block via the punch and the load receiving plate. Received pressure at. Then, when the driving reaction force acts on the block, a strain corresponding to the reaction force is generated in the block, and the strain amount is detected as an electric signal by the strain gauge and is output through the lead wire. Therefore, from this output value, the forging load by the punch can be known.

Then, due to a strain gauge failure or broken lead wire, it becomes necessary to inspect, repair, or replace it with a new one, or replace it with a block made of a material suitable for the shape and dimensions of the part to be forged. If so, take out the block together with the lead wire from the upper opening of the space for inspection, repair, or replacement. After completing inspections, insert the block together with the lead wire into the space from the opening on the top of the ram and return it to the original position.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
In FIG. 3 to FIG. 3, 11 is the machine base of the press forming machine, 12 is a die block installed horizontally on this machine base 11, and 13 is this die block.
A plurality of dies fitted in 12 are arranged at predetermined intervals in the lateral direction. 14 is a kick-out pin (KO pin), and each tip is inserted into the die 13. 15 is a main pin arranged at the rear of the kick-out pin 14, which is pushed when the ram 16 described later moves backward, and the kick-out pin 14 is moved forward with this pushing movement, The material B that has been driven into the die 13 is pushed out toward the front of the die 13. The material B extruded to the front of the die is transferred to the front surface of the next die 13 by a chuck (not shown) that moves left and right.

A ram 16 is arranged on the machine base 11 so as to move back and forth with respect to the die 13 in front of the die 13, and a punch 17 (17a) facing each die 13 is provided on the front surface of the ram 13.
Punch case fixed to the front of the ram 16 via the
It is attached by being inserted into 19. 26 is a block placed on the back of each punch 17, which is usually a spacer
The punch 17 is in contact with the rear end of the punch 17 via 17b (two in the figure). Reference numeral 22 is a load receiving plate 22 arranged at the rear of the block 26.

That is, each block 26 is punched from the top surface of the ram 16
(A spacer 17b in the figure) and a load receiving plate 22 are provided in a space 25 vertically provided in each of the rams 16 so as to have an upper opening portion thereof.
It is arranged by being inserted from 25a. 28, 28
Is a strain gauge attached to the block 26 by being stuck inside the recessed portions 27, 27 formed on both side surfaces of the block 26. The lead wires 29, 29 of the strain gauges 28, 28 are wired above the space 25 along the recessed grooves 30, 30 provided in the block 26 and are led out to the outside from the upper surface opening 25a. The strain gauges 28, 28 and their lead wires 29, 29 are prevented from being caught in the opening 25a and the like when the block 26 is taken in and out of the space 25. 31 is a lead wire 29, 29
It is a connector attached to. The strain gauges 28 are mounted on both sides of the block 26 in the above case,
You may make it attach only to one of the side surfaces. 32
Is an eyebolt planted on the top of the block 26.
The 26 can be used as a hook when putting it in and out.

In addition, each load receiving plate 22 has a rear end surface formed in an inclined shape so that the thickness in the front-rear direction (the left-right direction in the drawing) becomes thicker toward the lower portion, and vertical holes 23 are provided vertically in the ram 16 respectively.
It is disposed by being slidably housed in the vertical direction. Reference numeral 24 is an adjusting bolt that is threadedly threaded through the upper portion of the load receiving plate 22, the tip of which is in contact with the upper surface of the ram 16, and the bolt 24 is rotated to move the load receiving plate 22 up and down. Since the end face is inclined, the front end face is moved back and forth by a minute distance, and the position of the punch 17 is adjusted back and forth through the block 26 and the spacer 17b by this back and forth movement. .

Reference numeral 20 is a set bolt for fixing the punch 17 to the punch case 19, and 21 is a bolt for fixing the punch case 19 to the plate 18.

In the figure, the kickout pin (KO pin) 34 is also on the punch side.
The kickout pin 34 is shown.
Is inserted into the punch 17 by penetrating between the two forks at the lower part of the block 26, and the main pin 35 is provided at the rear part, and when the ram 16 retreats, the main pin 35 is moved by the swing lever 36. By being pushed, the kickout pin 34 is moved forward and the punch 17
The material B therein is extruded in front of the punch 17.

With the above configuration, punching is performed when the ram 16 moves forward.
The material B is driven into the die 13 by the 17 (state shown in the figure), and when the ram 16 retreats, the material B is pushed out to move to the next die 13
By repeating the operation of transferring to the front of the
A given forging is obtained from 13. In this case, every time the punch 17 drives the material B into the die 13, the driving reaction force (compressive force) acts on the block 26 via the punch 17 and the spacer 17b, and is received by the load receiving plate 22. Then, the driving reaction force acts on the block 26, so that the block 26
A strain corresponding to the reaction force is generated at the strain resistance, and the strain amount is detected as an electric signal by the strain gauges 28, 28, and is output via the lead wires 29, 29. Therefore, by inputting this output value to a display panel (not shown) installed outside the machine or the like, the forging load by the punch 17 for each molding can be known.

Then, due to failure of the strain gauges 28, 28 or disconnection of the lead wires 29, 29, check or repair, replace with a new one, or replace with a block made of a material suitable for the shape and dimensions of the part to be forged. If you need to or block
26 is taken out from the upper opening 25a of the space 25 together with the lead wires 29, 29 for inspection, repair, or replacement. After inspection, etc., connect block 26 to lead wire 2
9 and 29 are inserted into the space 25 through the opening 25a on the upper surface of the ram 16 and returned to the original position.

In the above embodiment, the strain gauges 28, 28 detect the detection values detected by the lead wires 29, 29 so as to be output to the outside, but the block 26 itself is provided with a transmitter such as a digital type. The detection value may be transmitted to the display panel or the like by the transmitter, and in this case, the lead wire and the transmission code from the lead wire to the display panel can be omitted.

[Effects of the Invention] As described above, the present invention provides a block having a strain gauge attached thereto, in a space vertically provided on the ram so as to extend from the upper surface of the ram to a space between the punch and the load receiving plate. And the lead wire of the strain gauge is attached to the block and led out to the outside from the upper opening of the space. Therefore, if it becomes necessary to take out the block to which the strain gauge is attached to the outside, it can be taken out directly from the top opening of the space, and by taking out this block, the lead wire of the strain gauge attached to it can also be taken out. You can take it out. Therefore, due to failure of the strain gauge or disconnection of the lead wire, it is necessary to inspect, repair, replace with a new one, or replace with a block made of a material suitable for the shape and size of the part to be forged. In this case, the work can be done easily and quickly.

Moreover, when this invention is carried out, it can be carried out by vertically installing a space extending from the upper surface of the ram to the space between the punch and the load receiving plate, so that it is not necessary to significantly change the design of the forging machine. Therefore, it can be implemented at low cost.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a main portion of a forging machine equipped with the forging load detection device of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a strain gauge. FIG. 4 is an enlarged perspective view of the attached block, and FIG. 4 is a sectional view of a main part of a forging machine equipped with a conventional forging load detection device. 11 ... Machine stand, 13 ... Die, 16 ... Ram, 17 ... Punch, 17b ... Spacer, 22 ... Packing plate, 25 ... Space, 25a
…… Aperture, 26 …… Block, 28 …… Strain gauge, 29 ……
Lead wire, B ... Material.

Claims (1)

[Scope of utility model registration request] 1. A machine base 11 is equipped with a die 13, and a ram which moves forward and backward with respect to the die 13 in front of the die 13.
16 is provided, and a punch 17 is mounted on the ram 16, and a block 26 having a strain gauge 28 attached to the back of the punch 17 is placed in the die 13 at the rear of the block 26. When the material is driven, the load receiving plate 22 for receiving the force received by the punch 17 through the block 26 is provided, and when the material is driven into the die 13 by the punch 17 and is press-formed, the block 26 In the forging machine configured to detect the strain amount of the strain gauge 28, the block 26 is vertically installed on the ram 16 from the upper surface of the ram 16 to the space between the punch 17 and the load receiving plate 22. It is arranged to be arranged between the punch 17 and the load receiving plate 22 by being inserted into the open space 25 from the upper surface opening 25a, and the lead wire 29 of the strain gauge 28 is attached to the block 26. And is led out from the upper surface opening 25a of the space 25 to the outside. Forging load detection apparatus for forging molding machine as.