JP2001150199A - Device and method for adjusting slide of forging press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide adjusting device for forging presses with which the slide is adjusted accurately and rapidly even when high-temperature operation is executed with a hot forging press, the amount of slide adjustment is made larger and the height of the press is lowered and an adjusting method therefor. SOLUTION: The slide adjusting device for forging presses is provided with an adjusting lever 6 the one end in the longitudinal direction of which is freely turnably brought into contact with the inside surface of a hole which penetrates both tip parts of the fork-shaped leg of a connecting rod 5 and also has a hole which is not co-axial from the center axis of this internally contact hole and the other end of which is freely oscillated in the direction orthogonal to the axial center of the eccentric hole in one end part and with a slide 4 which is hung through a wrist pin 8 inserted into the eccentric hole of the adjusting lever 6 and, by oscillating the other end of the adjusting lever 6, the one end is turned and the position of the slide is adjusted. In the above slide adjusting device, the oscillation of the adjusting lever 6 is driven with an electrically powered servomotor 20. By beforehand storing the optimum die height in accordance with a pattern of the presence or absence state of a formed product in plural dies and, when the actual forming is performed, a control command is calculated so as to obtain the optimum die height based on the detected pattern of the presence or absence state of the formed product in each die, the electrically powered servomotor 20 may be controlled by the calculated command.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide adjusting device for a forging press and a method for adjusting the same, and more particularly to a slide adjusting device for a forging press and a method for adjusting the same for performing a plurality of forging operations simultaneously.

[0002]

2. Description of the Related Art As a press machine for continuously performing automatic forging, a plurality of upper dies are arranged in a row on a lower surface of a slide which is suspended from a crankshaft via a connecting rod (hereinafter referred to as a "connecting rod"). And a forging part in which a lower die is mounted in a row at the position of the bolster upper surface facing the upper die, and a molding material is supplied, and is sequentially transported to the next die in each process, An apparatus having a conveying unit for taking out a molded product has been generalized.

[0003] Usually, in an automatic forging press machine,
The die height (the distance between the lower surface of the slide and the upper surface of the bolster at the lower dead point of the slide) is slid in a state where one molding material is always present in each of a plurality of sets of molds (a set of an upper mold and a lower mold). The machine is optimally set and operated by the adjusting device to continuously produce appropriate molded products.

[0004] At the start of operation and at the end of operation, a material or an intermediate product being formed only in a part of all dies,
Alternatively, since a state in which a molded product is placed occurs, a large press bias load is applied to molded products in a small number of dies, and defective products such as a decrease in the thickness of the molded product are produced. This is the same during the continuous operation. If a failure occurs in the apparatus for heating and supplying the material and the continuous supply is interrupted, a defective product may be generated for the same reason as described above. In addition, an idle station (hereinafter referred to as idle) that does not perform press molding may be provided depending on the structure, dimensions, and shape of the molds and the arrangement of the molds according to the required load for each of the plurality of molds. As described above, under the operating conditions specific to this automatic forging press, in which there is always a production stage where only some molds do not contain materials or molded products, overloads are applied to some molds and defective products Occur,
Alternatively, there is a problem that the mold and the press machine itself may be damaged.

Conventionally, various techniques for solving such a problem have been proposed. For example, Tokiko 6-7
No. 7878 discloses a load control device for an automatic mechanical forging press, and FIG. 13 is a configuration diagram described in the publication. As shown in the figure, the automatic mechanical forging press machine includes a plurality of upper dies 1 on a lower surface of a slide 4 which is supported on an eccentric shaft (crankshaft 2) via a connecting rod 5 so as to be vertically movable.
0a are mounted in a line, and a forging portion in which a lower mold 10b is juxtaposed on the upper surface of the bed facing the upper mold 10a and a molding material are supplied, and the molding W is sequentially transferred to the next mold in each single process. And a transfer unit (not shown) for feeding in and removing the molded product W. Also, a molded article detecting section 28 for detecting the presence or absence of a material or an intermediate molded article in each mold, an arithmetic control section 37 for outputting an execution command of an additional amount stored in advance based on the detection signal, and An actuating section 39 which moves an adjust lever 38 which is eccentrically fitted to the wrist pin 8 which is received and inserted below the connecting rod 5 by an oil pressure through the operating rod 36 by a desired angle to move the position of the bottom dead center. It has. Thus, the press load to be applied is determined depending on which of the multi-step molds has the material, the molded intermediate product, and the completed molded product (hereinafter, these are referred to as molded products). A load is applied to prevent a product defect from occurring, and a molded product having a uniform shape and dimensions can be produced.

[0006]

However, the technique disclosed in Japanese Patent Publication No. Hei 6-77878 has the following problems. 1) The operating rod 36 driven in the horizontal direction by the operating section 39
A connecting portion between the adjusting lever 38 and the adjusting lever 38 has the operating rod 36 slidably fitted in a notched bearing portion formed on the adjusting lever 38.
, Ie, the rotatable angle of the adjust lever 38 becomes narrow, and the slide adjustment amount cannot be increased. 2) The operating rod 36 that swings the adjusting lever 38 is orthogonal to the axis of the wrist pin that supports the adjusting lever 38 and is engaged with the upper part of the adjusting lever 38.
6 has a structure in which the slide is adjusted by controlling the hydraulic pressure of hydraulic cylinders mounted on both ends of the slide 6.
However, there is a problem that the internal structure of the forging press becomes very complicated and the height of the slide 4 becomes high, so that the height of the forging press machine itself becomes high. 3) The slide adjustment is performed using the hydraulic device as a drive source. Particularly, in hot forging for forming a heated material, the compressibility of the oil changes greatly with the change of the oil temperature. It is very difficult to adjust the slide. In addition, since the hydraulic control is used, there is a problem that the speed and the response in the high-speed control are low.

The present invention has been made in view of the above-mentioned problems, and it has been made possible to increase the amount of slide adjustment and to reduce the height of a press machine. Another object of the present invention is to provide a slide adjusting device for a forging press and a method for adjusting the same, which can perform slide adjustment at high speed.

[0008]

In order to achieve the above object, according to a first aspect of the present invention, a crankshaft and an upper portion are externally fitted to an eccentric portion of the crankshaft, and are divided into two portions at a lower portion. A connecting rod having a leg, and one end in the longitudinal direction rotatably inscribed in a hole penetrating both ends of the bifurcated leg of the connecting rod, and has a hole eccentric from the center axis of the inscribed hole. An adjustment lever whose other end is swingable in a direction orthogonal to the axis of the eccentric hole at one end, a wrist pin inserted into the eccentric hole at one end of the adjustment lever, and a wrist pin. And a slide supported on the main body frame so as to be able to move up and down freely. The other end of the adjustment lever is pivoted to rotate one end about the central axis, and the rotation causes the wrist pin to rotate. Adjust the slide position through the forging press slide tone In the device, and the swing of the other end portion of the adjusting lever configured to be driven by an electric servo motor.

According to the first aspect of the invention, the other end of the adjustment lever, which suspends the slide via the wrist pin inserted in the eccentric hole formed at one end, is swung by the electric servomotor, whereby Adjusting the slide position. The swing control by the electric servomotor can control the slide position accurately and stably even at the time of high temperature work in hot forging, because the control characteristics of the control medium (oil, etc.) do not fluctuate as in the past. At the same time, high-speed control is possible because of good control response. In addition, since a hydraulic device is not used as a drive source for slide adjustment, there is no need for oil temperature management, periodic inspection and replacement work to prevent problems caused by oil shortage and oil deterioration, and measures to prevent oil leakage, etc. Is unnecessary, and maintenance work can be greatly reduced.

According to a second aspect of the present invention, in the slide adjusting device for a forging press according to the first aspect of the present invention, the adjusting lever is disposed perpendicularly to the slide elevating direction, and is provided at the other end of the adjusting lever. A nut having a substantially parallel screw hole, provided substantially parallel to the vertical direction of the slide,
One end is screwed into the screw hole of the nut, and the other end is provided with an adjusting screw shaft that is rotationally driven by an electric servomotor.

According to the second aspect of the present invention, since the adjusting lever is provided in the horizontal direction, the internal structure of the slide is simplified, and the height direction of the forging press is reduced by a length corresponding to the lever portion of the adjusting lever. The height of itself can be reduced. Also, since the adjusting screw shaft is provided substantially parallel to the vertical direction of the slide, the adjusting lever and the adjusting screw shaft are connected by screwing, and the adjusting screw shaft is rotated by the electric servomotor to swing the adjusting lever. It is possible to arbitrarily lengthen the screw length of the screw portion of the adjusting screw shaft, so that the slide adjustment amount of the adjusting lever can be increased. Further, since the adjustment lever is provided in the horizontal direction, it is possible to provide a connecting portion between the adjustment lever and the adjustment screw shaft, the adjustment screw shaft, the electric servomotor, and the like on the outside of the slide side. Maintenance becomes very easy.

According to a third aspect of the present invention, in the slide adjusting device for a forging press according to the first aspect of the present invention, the adjusting lever is disposed perpendicular to the vertical direction of the slide, and is provided in parallel with the vertical direction of the slide, and one end of the adjustable lever is provided. An adjustment screw shaft that is pin-connected to the other end of the adjustment screw shaft and has a screw portion at the other end, and a nut member screwed to the screw portion at the other end of the adjustment screw shaft and rotationally driven by the electric servomotor. Is provided.

According to the third aspect of the present invention, since the adjusting lever is provided in the horizontal direction, the internal structure of the slide is simplified, and the pressing height is reduced by the length corresponding to the lever portion of the adjusting lever. Can be lowered. The adjusting screw shaft is provided substantially parallel to the slide elevating direction, the adjusting lever and one end of the adjusting screw shaft are rotatably pin-connected, and the nut member screwed to the other end of the adjusting screw shaft is electrically driven. Since the adjustment lever is swung by rotating by the servo motor,
The slide adjustment amount of the adjustment lever can be increased by arbitrarily increasing the screw length of the screw portion of the adjustment screw shaft. Furthermore, because the adjustment lever is provided in the horizontal direction,
The connecting portion between the adjusting lever and the adjusting screw shaft, the adjusting screw shaft, the electric servomotor, and the like can be provided outside the slide side, so that maintenance of these parts and parts becomes very easy.

According to a fourth aspect of the present invention, in the slide adjusting device for a forging press according to the first, second or third aspect, a hole provided with an internal gear at an inner peripheral portion is formed at one end of the adjusting lever. It is driven to rotate via outer teeth meshing with the internal gear,
The eccentric ring has the eccentric hole in which the wrist pin is inserted.

According to the fourth aspect of the invention, the rotation of one end caused by the vertical swing of the other end of the adjusting lever is controlled by the gear coupling mechanism (the internal gear of the hole at one end and the outer peripheral teeth of the eccentric ring). It is transmitted mechanically to an eccentric ring inserted in the hole. With this, when the other end of the adjusting lever is controlled to swing vertically by the electric servomotor via the adjusting screw shaft, the slide position can be accurately adjusted via the eccentric ring and the wrist pin inserted in the eccentric ring. Can be controlled. In addition, since the connection between the adjustment lever and the wrist pin is performed via an eccentric ring that is separated from the adjustment lever body and meshed with the gear coupling mechanism,
The connecting and assembling work of the adjustment lever, the wrist pin and the slide becomes easy, and the assembling workability can be improved.

According to a fifth aspect of the present invention, there is provided a molded article detecting means for detecting the presence or absence of a molded article in a mold, and a die height is set to a target value based on a target value of the die height preset according to a detection result of the molded article detecting means. And a control command calculating means for calculating and outputting a control command so as to adjust the slide position. In a slide adjusting device of a forging press, a motor control means for driving an electric servomotor for adjusting the slide position is provided. The control command calculating means stores the optimum die height in advance in accordance with the presence / absence state pattern of the molded products of a plurality of molds, and stores the die presence / absence state pattern of each mold detected by the molded product detection means during actual molding. A control command is calculated so as to obtain the optimum die height based on the stored and output to the motor control means.

According to a seventh aspect of the present invention, there is provided a slide adjusting method of a forging press for detecting presence / absence of a molded product of a mold and adjusting a slide position based on a preset die height target value in accordance with the detection result. At the time of start-up, the apparatus is operated at a predetermined die height set in advance, and then, at each slide stroke, the molded article is sequentially conveyed onto a plurality of dies, and the presence or absence of the molded article for each mold is determined at each slide stroke. From the optimum die heights detected and stored in advance in accordance with the presence / absence state pattern of the molded product of each mold, the optimum die height is selected based on the detected presence / absence state pattern of the molded product for each mold, and the selected optimum die height is selected. The electric servomotor is controlled so that

According to the fifth or seventh aspect of the present invention, the presence / absence state of the molded article of each mold detected by the molded article detection means from the optimum die height stored in advance in accordance with the pattern of the existence state of the molded article of each mold. , The die height can be controlled so as not to be overloaded even if only a part of the plurality of dies has a molded product. Therefore, for example, when there is a molded product only in a part of a plurality of molds, such as at the start of operation and at the end of operation, or when the molded product is not missing in the mold in the middle process due to a transport error, However, since the press forming load can be changed according to the presence or absence of the molded product in each mold, a stable good molded product can be produced. In addition, since only a constant molding load is applied to the mold, the life of the mold can be extended, and abnormal wear and failure can be prevented by applying no excessive load to the press machine. Furthermore, since molding can be performed in correspondence with various molds, such as when molding is performed in a toothless state such as every other or every two moldings,
The versatility of the press machine can be improved.

According to a sixth aspect of the present invention, in the slide adjusting device for a forging press according to the fifth aspect of the present invention, a die height detecting means for detecting a die height is provided, and the control command calculating means compares the die height detected by the die height detecting means with the optimum die height. Then, a deviation value is calculated, and a control command is calculated so as to reduce the deviation value and output to the motor control means.

According to an eighth invention, in the slide adjusting method for a forging press according to the seventh invention, a die height is detected at the time of actual machining, and the detected die height is compared with the selected optimum die height to calculate a deviation value. The method is such that the electric servomotor is controlled so that the value becomes smaller.

According to the sixth or eighth aspect of the present invention, the deviation between the optimum die height according to the presence or absence of the molded product of each mold (including idle) and the die height detected by the die height detecting means is reduced. Because the slide position is adjusted, it is always possible to control the die height accurately and optimally. Therefore, in continuous automatic forging press forming, even if the presence or absence of a molded product in the mold changes at the start of operation, at the end of operation, or at the time of occurrence of a transport error, etc., the optimum die height can be accurately adjusted in a short time. Forging press forming can be performed at any time, so that good products can always be formed stably. Therefore, the press production speed can be increased to increase the productivity.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, a first embodiment will be described with reference to FIGS. FIG. 1 is a front sectional view of a main part of a mechanical forging press to which a slide adjusting device according to the present invention is applied, and FIG. 2 is a sectional view taken along line AA of FIG. A crankshaft 2 rotatably supported is provided on an upper part of the press machine 1, and a main body frame 3 is provided below the crankshaft 2.
A slide 4 is mounted on the slide 3 so as to be vertically movable. The slide 4 is connected to the crankshaft 2 via a connecting rod 5, an adjustment lever 6, an eccentric ring 7, and a wrist pin 8, which will be described later.

The upper part of the connecting rod 5 is fitted to the eccentric part 2a provided at the center of the crankshaft 2 by a cylindrical hole 5a, and the bifurcated legs 5b, 5b hang down the lower part of the connecting rod 5. are doing. A pair of left and right eccentric rings 7 and 7 are inserted into cylindrical holes 5c and 5c penetrating the two legs 5b and 5b in the left-right direction, and a wrist pin 8 is inserted into the eccentric holes of the eccentric rings 7 and 7. It is inserted parallel to the axis 2. A gear forming portion 6a of the adjustment lever 6 is rotatably fitted to the outer peripheral portion of the pair of left and right eccentric rings 7, 7 in the left-right direction via gears. This adjustment lever 6
Are arranged in a direction perpendicular to the vertical movement direction of the slide 4 (here, horizontally behind the press).

Both ends of the wrist pin 8 penetrating the eccentric holes of the pair of left and right eccentric rings 7, 7 pass through the upper part of the slide 4 on the left and right outer sides of the respective eccentric rings 7, 7, and form a pair of left and right fixing plates 9. , 9 attached to the slide 4. A predetermined number of upper dies 10a are mounted on the lower surface of the slide 4, and the same number of lower dies 10 as the upper dies 10a are mounted on the upper surface of the bolster 11 provided at the lower part of the main body frame 3.
b are mounted facing the upper mold 10a.
A pair of upper and lower molds 10a and 10b constitute a set of processing stations.

FIG. 3 is a perspective view of the adjusting lever 6, and as shown in FIG. 3, the adjusting lever 6 includes a gear forming portion 6a and a lever portion 6b. The gear forming portion 6a is formed with upper and lower semi-ring-shaped portions 6e separately from each other in the upper and lower portions. A pair of left and right lower half-ring portions 6f, 6f are formed on the lower left and right sides, that is, below both ends of the upper half ring-shaped portion 6e. A pair of left and right internal gears 6h, 6h is provided on the inner peripheral portion of the upper half ring-shaped portion 6e, and the inner gears 6 are provided on the inner peripheral portions of the pair of left and right lower half ring-shaped portions 6f, 6f, respectively.
c is provided. The pair of left and right internal gears 6h, 6h and the pair of left and right internal gears 6c, 6c have the same pitch circle diameter, and form a pair of left and right inner peripheral gears with each other. A hole 6d is provided in the lever portion 6b in the axial direction of the wrist pin 8, and a nut 19 is inserted in the hole 6d as shown in FIG. Further, a hole 6g orthogonal to the hole 6d is provided through the lever portion 6b.

FIG. 4 is a perspective view of the nut 19,
As shown in the figure, the nut 19 is substantially cylindrical, is rotatably inserted in the hole 6d, and forms two surfaces 19a, 19a parallel to each other on the cylindrical side surface.
Screw hole 1 that penetrates between and is perpendicular to the cylindrical axis
9b is provided. The nut 19 is inserted into the hole 6d such that the screw hole 19b is substantially parallel to the vertical direction of the slide 4.

FIG. 5 is a perspective view of the eccentric ring 7. The pair of left and right eccentric rings 7 and 7 has a configuration different from each other, and FIG. 1 shows the left eccentric ring 7 in FIG. The eccentric ring 7 is formed such that the central axis C1 of the outer peripheral cylinder and the central axis C2 of the inner peripheral cylinder are eccentric. The upper half of the eccentric ring 7 has a semi-ring-shaped part protruding inward (rightward in the figure) in the left-right direction of the press machine, and an external gear 7b is provided on the outer peripheral surface of the protruded half-ring-shaped part. I have.
An external gear 7a is provided on the outer peripheral surface of the lower part of the press machine in the left-right direction (lower half of the eccentric ring 7 in the figure) than the protruding semi-ring-shaped part. The external gear 7a of the eccentric ring 7 and the internal gear 6 of the lower half ring-shaped portion 6f of the adjustment lever 6
c, and the external gear 7b of the eccentric ring 7 and the internal gear 6h of the upper half ring-shaped portion 6e of the adjusting lever 6 mesh with each other to form a gear coupling mechanism. Thus, when the gear forming portion 6a of the adjustment lever 6 rotates around the central axis C1, the eccentric ring 7 also rotates around the central axis C1.

As shown in FIG. 2, a case 12 is attached to a lower rear surface of the slide 4, and an electric servomotor 20 is attached to an upper portion of the case 12. A sprocket 21 is attached to an output shaft of the electric servomotor 20, and a sprocket 16 is attached to a shaft end of a worm shaft 15 on an input side of a worm mechanism provided in the case 12, and a space between the two sprockets 21 and 16 is provided. They are connected by a roller chain 22. The worm mechanism in the case 12 has an adjustment screw shaft 17 having a screw portion on one end screwed into a screw hole 19b of a nut 19 inserted into the lever portion 6b of the adjustment lever 6.
Is rotatably incorporated at the other end.

FIG. 6 shows a worm mechanism formed inside the case 12, and FIG. 7 is a sectional view taken along the line BB of FIG. As shown in FIGS. 6 and 7, a worm wheel 13 that rotates in a horizontal plane is disposed inside the case 12, and a ring 14 is incorporated above the worm wheel 13 so that the worm wheel 13 does not move in the vertical direction. I have. Then, the worm shaft 1 is engaged with the teeth of the worm wheel 13.
5 are arranged in the horizontal direction. As shown in FIG. 7, the worm wheel 13 and the worm shaft 15 constitute a worm mechanism, and the rotation of the worm shaft 15 causes the worm wheel 13 to rotate in a horizontal plane. Electric servo motor 20
As a result, the worm shaft 15 is rotated via the roller chain 22 and the sprocket 16. A sprocket 23 is also attached to a shaft end of the worm shaft 15 opposite to the sprocket 16, and the sprocket 23 is connected to a die height detector described later via a roller chain 25, and constitutes a part of die height detecting means. are doing.

A cylindrical hole 13a is provided at the center of the rotation axis of the worm wheel 13, and a lower portion of the adjusting screw shaft 17 is inserted into the hole 13a. Grooves 13b are provided in the axial direction at positions equally divided into four on the inner surface of the hole 13a in the circumferential direction.
Are provided on the outer peripheral surface of the portion of the adjusting screw shaft 17 inserted into the hole 13a, at a position corresponding to the groove 13b.
Each is inserted into the inside so as to be movable up and down. Also, a screw portion 17a is machined on the upper part of the adjusting screw shaft 17,
The screw portion 17a is provided in the hole 6 of the lever portion 6b of the adjustment lever 6.
g, and is further screwed into the screw hole 19b of the nut 19 inserted into the hole 6d of the lever portion 6b. Thereby, the axis of the adjusting screw shaft 17 becomes substantially parallel to the vertical movement direction of the slide 4. Further, a piston 24 is incorporated into the lower end of the adjusting screw shaft 17, and a hydraulic chamber 12 a is formed by the lower outer wall of the case 12 and the piston 24. Pressure oil discharged from a hydraulic pump (not shown) is supplied to the hydraulic chamber 12a to pressurize the lower surface of the piston 24 and press the piston 24 against the lower portion of the adjusting screw shaft 17, whereby the adjusting screw shaft 17 does not move in the vertical direction. Like that.

Next, a control device and a control method of the slide adjusting device will be described with reference to FIGS. An automatic forging press that continuously produces a plurality of molds side by side, controls the operation of the slide 4, carries in the molding material, sequentially transports it to the next mold in each process, and moves the molded product to the outside of the press. Synchronous operation with the take-out transport control. In general, a transfer unit that drives a transfer device that is a target of the transfer control mechanically connects a crankshaft 2 of a press machine and a drive shaft of the transfer device by a universal joint or the like, and a cam or a gear. There is a mechanical transfer device that performs synchronous operation using the same or the like, and an electric servo transfer device that electrically controls the rotation angle of the crankshaft 2 and the positions of the servomotors of a plurality of drive shafts of the transfer device. . In the present invention, the driving means of the transfer device may be any of the above-mentioned mechanical type or electric servo type. In the present embodiment, a transfer device using an electric servo system will be described as an example.

FIG. 8 is a control function block diagram of the slide adjusting device according to the present invention. A crank angle detector 32 for detecting a crank angle is attached to the rotation shaft of the crank shaft 2, and the detected crank angle signal is input to a controller 33 described later. A plurality of upper dies 10a are mounted on the lower surface of the slide 4 that moves up and down, and lower dies 10b are juxtaposed at the bolster upper surface positions facing the respective upper dies 10a.

A pair of feed bars 31, 31 are disposed on the left and right sides (ie, before and after the press machine) with respect to the conveying direction of the molded product (normally, the left and right direction of the press machine). A gripper 34 for transporting the molded product is attached. The pair of left and right feed bars 31, 31 move in the transport direction (advance axis),
The first and third units 31 and 31 are movable in three directions, that is, movement in a contact / separation direction (clamp axis) and movement in a vertical direction (lift axis), and are each driven by an electric servomotor (not shown). . The electric servomotor of each axis is driven by a control command from the controller 33, and is controlled in synchronization with the crank angle based on a predetermined feeder motion. Thus, the molded product is supplied to the lower die 10b by the gripper 34 by the motion of the feed bar 31, and the molded product is sequentially conveyed to the next die every one stroke (one cycle of vertical movement) of the slide 4.

The molded article detecting means 41 has an error detecting sensor 35 attached to each gripper 34. The molded article detecting means 41 determines that there is a molded article in the mold based on the detection signal of each error detection sensor 35 when the molded article fixed to each lower mold 10b is normally gripped by the respective gripping tool 34. When there is no molded product at the time of gripping, or when the molded product is misaligned and cannot be normally gripped, it is determined that there is no molded product in the mold based on the detection signal of each error detection sensor 35. It is also determined that there is no molded article when the molded article falls off the gripper 34 during the conveyance. The molded article detection means 41
A detection signal indicating the presence / absence of a molded article corresponding to each mold is output to the control command calculation means 42.

The die height detecting means 48 constantly detects the die height, and detects the current die height based on, for example, the slide position after the slide adjustment is completed. In the present embodiment, the current die height is detected by obtaining the slide position from the rotation angle of the worm shaft 15. Specifically, for example, the rotation of the sprocket 23 attached to the end of the worm shaft 15 provided in the case 12 described above is transmitted to the gear 49 via the roller chain 25,
The rotation angle of the worm shaft 15 is detected by a die height detector (here, a resolver) 50 connected to the rotation shaft of the gear 49. The rotation angle signal detected by the resolver 50 is converted into a digital signal by the signal converter 43 and input to the control command calculation means 42.

The control command calculating means 42 is provided with an arithmetic processing unit (hereinafter referred to as a microcomputer or a numerical processor).
In this embodiment, a programmable controller (CPU and I / O) is used.
It comprises a (input / output) board or the like, hereinafter referred to as PLC) 44 and a signal converter 43. The control command calculation means 42 has a predetermined memory, and in this memory, a relation table (hereinafter referred to as a die height table) of an optimum die height according to the presence or absence of a molded product of each lower mold.
Remember. Further, the detection signal of the die height detection means 48 is converted into a digital signal by the signal converter 43 and taken in. The control command calculating means 42 inputs the detection signal of presence / absence of a molded article for each lower mold 10b from the molded article detecting means 41, and based on the die height table, the respective lower molds 10b
The optimum die height is determined according to the presence / absence state of each molded product. Next, the present die height is calculated based on the detection signal from the die height detecting means 48, the optimum die height value is compared with the present die height, and the deviation value is calculated. A control command is output to the motor control device 45 for each stroke.

The motor control device 45 outputs a drive command for controlling the rotation position and the rotation speed of the electric servomotor 20 based on the control command. Slide adjustment driving means 47
Controls the rotation position and rotation speed of the electric servomotor 20 according to a drive command from the motor control device 45, and drives the rotation of the adjusting screw shaft 17 via the worm mechanism in the case 12 by this rotation. The rotation of the adjustment screw shaft 17 causes the adjustment lever 6 to swing up and down in the figure to change the vertical position of the slide 4 via the eccentric rings 7, 7 and the wrist pin 8, thereby changing the die height. .

The die height setting means 46 has a display for displaying the current value of the die height and the setting data, and a setting device for inputting each setting data of the die height table. For example, it is provided with a setting device such as a numerical key and a write switch, and a graphic display such as a liquid crystal display and an indicator such as an LED indicator. The setting signal from the setting device and the display signal to the display are read by the PLC
44.

The crank angle detector 32 detects the rotation angle of the crankshaft 2 and outputs it to the controller 33 as a crank angle signal.
Output to The controller 33 is mainly composed of an arithmetic processing device mainly composed of a microcomputer, for example. The controller 33 receives the crank angle signal at the time of actual machining, and sets the feed bar 31 to a two-dimensional (previously set by driving only two of the three drive axes of the transfer device) or three-dimensional (drive of the transfer device). The driving three axes of the transport device are controlled so that the feed bar 31 moves along a motion curve of (driving by three driving axes). That is, a target position of each drive shaft of the feed bar 31 corresponding to the crank angle signal is calculated based on a predetermined motion curve, and a current position signal from a position detector (not shown) of each drive shaft is calculated. A control command for each drive shaft motor (not shown) is calculated based on the deviation value from the target position and output to a drive amplifier (not shown) for each drive shaft motor. In addition, a detection signal from the molded article detection means 41 is taken in, and when a conveyance error such as a case where the molded article falls off from the gripper 34 during conveyance is detected, a sudden stop command of the slide 4 is output to the control command calculation means 42. I do.

Next, the operation of the slide adjusting device based on the above configuration will be described. The electric servomotor 20 adjusts the die height by controlling the vertical position of the slide 4 with respect to the connecting rod 5, and the rotation is controlled so as to be able to move forward and backward freely. The electric servomotor 20 rotates the worm shaft 15 via the roller chain 22, and rotates the worm wheel 13 by the worm mechanism. When the worm wheel 13 rotates, the groove 13 of the worm wheel 13
The adjusting screw shaft 17 is also rotated simultaneously by the pin 18 fitted to b. At this time, the adjusting screw shaft 17 is
The nut 19 of the screw portion 17a of the adjustment screw shaft 17 moves in the up-down direction by being rotated by pressing in a state where the position in the up-down direction is fixed.

When the nut 19 moves up and down, the lever portion 6b of the adjustment lever 6 swings around the central axis C1 substantially parallel to the vertical movement direction of the slide 4, and the rotation of the gear forming portion 6a of the adjustment lever 6 rotates. The eccentric ring 7 rotates around the central axis C1 by the movement via the gear coupling mechanism. Here, it is assumed that the center axis C2 of the wrist pin 8 is initially set so as to be substantially horizontal with respect to the center axis C1 of the eccentric ring 7. When the eccentric ring 7 rotates, the center axis C2 of the axis of the wrist pin 8 is eccentric with respect to the center axis C1, and thus moves in the vertical movement direction of the slide 4, whereby the slide 4 fixed to the wrist pin 8 is moved. Also move up and down at the same time. Therefore, the die height changes, and the die height can be adjusted by controlling the position of the electric servomotor 20.

Referring to FIG. 9, the position of the slide 4 and the operating position of each axis of the feed bar 31 according to the rotation angle (crank angle) of the crankshaft 2 during automatic operation will be described. FIG.
Shows an example of a motion curve representing the relationship between the position of the slide 4 corresponding to the crank angle and the operating position of each axis of the feed bar 31. According to the figure, when the slide 4 descends and the crank angle becomes close to 45 degrees, the advance of the feed bar 31 in the molded article conveying direction (feeding direction) ends. Subsequently, the feed bar 31 goes down (down),
When the gripper 34 is gripping a molded product, the gripper 34 is unclamped (opened) so that the molded product is placed at a predetermined position of the lower mold 10b. Also at this time, the slide 4 descends, and the feed bar 31 starts returning when the crank angle is around 120 degrees. Then, forging is performed near the position where the slide 4 reaches the bottom dead center (the crank angle is around 180 degrees), and the slide 4 rises past the bottom dead center. When the crank angle approaches 240 degrees, the feed bar 31 ends the return. Subsequently, the pair of feed bars 31, 31 advance in a direction approaching each other toward the lower mold 10b, and when the crank angle is around 270 degrees, the gripper 3 is moved.
The molded product is clamped (gripped) by 4. After that, the feed bar 31 is lifted (elevated) and the crank angle becomes 30 degrees.
The lift ends at around 0 degrees, and the advance starts.

In the continuous automatic forging press molding in which the slide 4 and the feed bar 31 operate synchronously based on the motion curve as described above, a molded product is supplied and conveyed as follows. At the start of operation, the molded product must be
Step), and after completion of pressure molding, the molded product is gripped by the gripper 34 of the feed bar 31, released from the mold, and conveyed to the next (second step) lower mold 10b. .
At this time, the next molded product is simultaneously placed in the lower mold 10b of the first step.
Transported to In this way, the conveyance and the molding progress one after another, and during the normal continuous operation, all the lower dies 10b, for example, in the case of a molded product in which the forged product is completed in the fourth step, all of the four lower dies 10b Then, the molded product is conveyed and simultaneously subjected to pressure molding. At the end of the operation, the supply of molded articles is sequentially eliminated from the first step. Pressure is applied to the lower mold 10b from the second step to the fourth step while the molded article is present, without transporting the molded article to the lower mold 10b in the first step. Finally, the lower mold 10 in the fourth step
b), and press-molds only the molded product in b.
To release from the mold, and then to the outside of the press machine to complete the operation.

Next, a die height adjusting method according to the present invention will be described with reference to FIG. FIG. 10 is a table showing the relationship between the molded article presence / absence pattern and the set die height value when the molding die station has four steps (W1 to W4). Normally, in a mold that performs pressure molding by simultaneously proceeding a plurality of steps, the generated press load differs depending on the presence or absence pattern of a molded product in each mold. On the other hand, the press load is usually proportional to the amount of run-in. Therefore, in the present invention, focusing on the fact that the amount of run-in can be controlled by the amount of change in die height due to slide adjustment, the slide adjustment control for each molded article presence / absence pattern is controlled by the electric servo of the slide adjustment drive means 47 by the control command calculation means 42. The die height is adjusted at high speed by driving the motor 20 instantaneously.

The die height set for each molded article presence / absence pattern differs depending on the product. The optimum driving amount in each pattern can be obtained by confirming the molding result of a non-defective product by trial hitting for each process before starting actual processing production, and if the optimum die height setting value is determined based on the driving amount, Good. Then, the optimum die height setting value for each pattern as shown in FIG. 10 is stored in a predetermined memory of the PLC 44 in advance. The state of distribution of such molded products (raw materials, intermediate products, and products) in each lower mold is all detected by the error detection sensor 35 of the molded product detection means 41 every moment, and is input to the PLC 44.

Next, a method of controlling slide adjustment according to the present invention will be described with reference to FIG. FIG. 11 shows an example of this control flowchart, where each processing step number is represented by adding S. The slide 4 in the continuous automatic forging press molding starts to rise after the completion of the molding process. At this time, in S1, the presence or absence of a molded product for each mold is detected by each error detection sensor 35. At this time, the slide 4 is rising, and the crank angle is around 270 degrees. Next, in S2, a detection signal of presence / absence of a molded product for each mold is input to the PLC 44 of the control command calculating means 42, and a presence / absence pattern of the molded product is determined based on the detection signal. The optimum die height corresponding to the matching pattern is selected by comparison.

Next, in S3, the optimum die height is compared with the current die height to calculate a deviation value between the two die heights, and a control command is calculated based on the obtained deviation value and output to the motor control device 45. I do. In S4, the electric servomotor 20 is rotationally driven by the drive command of the motor control device 45, and the die height is controlled toward the optimum die height value. Note that the crank angle at the time of these arithmetic processing and at the end of the die height adjustment by the rotation of the electric servomotor 20 is around 30 degrees, and the slide 4 is at the position where the slide 4 has started to descend.

Thereafter, in S5, the die height value detected by the die height detecting means 48 is compared with the target optimum die height value.
Returning to S3, the above processing is repeated until the two coincide with each other. If they coincide, the processing returns to S1 to complete the molding, and the above processing is repeated for the next molded article.

According to the above configuration, the following effects can be obtained. The adjustment lever 6 is provided in a direction perpendicular to the vertical movement direction of the slide 4, the adjustment screw shaft 17 of the adjustment lever 6 is provided in parallel with the vertical movement direction of the slide 4, and the adjustment screw shaft 17 is rotated by an electric servomotor 20. It has a simple structure in which the die height is adjusted as controllable. As a result, the control mechanism such as the lever portion 6b of the adjustment lever 6, the adjustment screw shaft 17, and the electric servomotor 20 is disposed outside the side of the slide 4, thereby facilitating operations such as die height adjustment, maintenance, and inspection. At the same time, it is less susceptible to the effects of fine powder and heat generated by press-molding a heated material, and the number of failures due to this can be reduced. Further, since the adjusting screw shaft 17 is provided substantially parallel to the vertical movement direction of the slide 4, the strength (rigidity) of the adjusting screw shaft 17 against the vertical vibration of the slide generated by forging is increased, and the durability can be improved. , Weight and size can be reduced.

Further, since the adjusting lever 6 is disposed in the horizontal direction, the connecting rod 5 can be shortened by the length of the lever portion 6b, so that the height of the entire press machine can be reduced and the size of the press machine can be reduced. Further, since the adjusting screw shaft 17 is disposed substantially vertically outside the side of the slide 4, the length of the screw portion of the adjusting screw shaft 17 can be increased without affecting the height of the press machine. And the die height adjustment amount can be increased.

Further, by mechanically transmitting the rotation of the adjustment lever 6 to the eccentric ring 7 by the gear coupling mechanism, the position of the wrist pin 8 can be accurately and reliably adjusted by the rotation of the adjustment lever 6. The eccentric hole of the adjusting lever 6 into which the wrist pin 8 for suspending the slide 4 is inserted has a central axis C2 eccentric with respect to the central axis C1 in a hole having the central axis C1 which is not eccentric. It is constituted by inserting eccentric rings 7, 7 having holes formed therein. As a result, it is not necessary to form a protrusion on the outer peripheral portion around the eccentric hole of the adjustment lever 6, so that one end of the adjustment lever 6 is inserted into a hole passing through the forked lower end of the connecting rod 5. It becomes easy to insert it rotatably. In addition, since the eccentric ring 7 is provided separately from the adjusting lever 6, the eccentric ring 7 is rotated to an arbitrary position in accordance with the positional relationship between the slide 4, the wrist pin 8, and the hole of the adjusting lever 6, and Since it can be inserted into the hole, the assembling work becomes easy.

Further, since the rotation angle of the adjusting screw shaft 17 is controlled by the electric servomotor 20, control responsiveness is better than in the conventional hydraulic control, and the position of the slide 4 can be controlled at high speed and with high accuracy. . Therefore, when actual machining is performed with a large number of strokes, the die height can be adjusted at high speed during one stroke, so that the production speed of press working can be increased and productivity can be improved. In addition, since the hydraulic device is not used as a drive source for slide adjustment, there is no need for operations such as oil temperature management, oil amount management, periodic inspections and periodic replacements to prevent problems such as oil leaks and oil deterioration. Maintenance work can be greatly reduced, and initial costs and maintenance costs can be reduced.

Further, by controlling the slide adjusting device so as to obtain an optimum die height in accordance with the pattern of the presence or absence of a molded product in each mold, the molded product may be partially removed, such as at the start of operation or at the end of operation. Even when supplied only in the mold,
It is possible to apply an optimal press forming load that does not cause defective products to the molded product, so that a stable good molded product can be obtained and the generation of defective products can be reduced. In addition, since it is possible to cope with a work that is formed without a molded product in the middle mold, such as placing one or two in multiple dies, the work target that can be formed is expanded and versatility is improved. it can. Furthermore, since only a constant molding load is applied to the mold, the life of the mold can be prolonged, and an excessive load is not applied to the press machine, so that abnormal wear and failure of each part of the machine can be prevented.

Also, during continuous operation, a failure or the like occurs in a device for heating and supplying a molded product, and continuous supply of the molded product is interrupted. In some cases, pressurization may occur in the “missing tooth state”. Also at this time, it is possible to detect the tooth missing state and adjust the slide position to the optimum die height according to this state. As described above, even if the tooth missing position suddenly occurs during continuous operation and the tooth missing position moves sequentially, the optimum die height is adjusted according to the change in this state, so that defective products due to uneven load can be significantly reduced. .

In the above embodiment, the nut 19 is mounted on the lever portion 6b of the adjustment lever 6, and the adjustment screw shaft 17 is rotated to move the nut 19 up and down to swing the adjustment lever 6. However, the present invention is not limited to this. For example, FIG. 12 shows another embodiment of the connection between the adjustment lever 6, the adjustment screw shaft, and the electric servomotor 20.
One end of adjustment screw shaft 17a and lever 6 of adjustment lever 6
b and the worm wheel 1
The screw hole 28 is machined into the screw hole 3, and the screw portion 27 formed at the other end of the adjustment screw shaft 17 a is screwed into the screw hole 28, and the adjustment screw shaft 17 a is moved in the vertical direction by the rotation of the worm wheel 13, and the adjustment is performed. The lever 6 may be configured to swing. The worm wheel 13 having the screw hole 28 is not limited to this, and may be any nut member that is rotationally driven by the electric servomotor 20.

As described above, in an automatic forging press in which a plurality of dies successively advance in multiple steps continuously, based on the presence or absence of a molded product in each die, the optimum die height is always set. High-speed, high-precision adjustment is possible with an electric servomotor. Connecting the adjustment lever provided substantially perpendicular to the vertical direction of the slide and the adjustment screw shaft provided substantially parallel to the vertical direction of the slide,
A simple configuration in which the adjustment screw shaft is rotated by an electric servomotor to swing the adjustment lever. Therefore, non-defective products can be automatically produced continuously from the start to the end of the operation, the occurrence of failures can be reduced, the overall height of the press machine can be reduced, and the maintenance workability and productivity of the press operator can be greatly improved. . In particular, even in a severe working environment of vibration, heat, and dust generated by forging, such as in hot forging, the above-described effect is remarkably exhibited.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a main part of a mechanical forging press to which a slide adjusting device according to the present invention is applied.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of an adjustment lever.

FIG. 4 is a perspective view of a nut.

FIG. 5 is a perspective view of an eccentric ring.

FIG. 6 is a structural diagram of a worm mechanism.

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

FIG. 8 is a control function block diagram of the slide adjustment device according to the present invention.

FIG. 9 is an example of a motion curve representing a relationship between a slide position corresponding to a crank angle and an operation position of each axis of a feed bar.

FIG. 10 is a diagram showing a relationship between a molded article presence / absence pattern and a set die height value when four molding die stations are provided.

FIG. 11 is a flowchart example of slide adjustment control according to the present invention.

FIG. 12 shows another embodiment of the connection between the adjustment lever, the adjustment screw shaft, and the electric servomotor.

FIG. 13 is a configuration diagram of a slide adjustment device according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Press machine, 2 ... Crankshaft, 2a ... Eccentric part, 3 ...
Body frame, 4 ... slide, 5 ... connecting rod, 5a,
5c: cylindrical hole, 5b: leg, 6: adjusting lever, 6a: gear forming portion, 6b: lever portion, 6c: internal gear, 6d: hole, 6
e: Upper half ring-shaped part, 6f ... Lower half ring-shaped part, 6g ...
Holes, 6h: internal gear, 7: eccentric ring, 7a, 7b: external gear, 8: wrist pin, 9: fixing plate, 10a: upper die, 1
0b: Lower mold, 11: Bolster, 12: Case, 12a
... hydraulic chamber, 13 ... worm wheel, 13a ... hole, 13
b: groove, 15: worm shaft, 16, 21, 23: sprocket, 17, 17a: adjusting screw shaft, 17a: screw part,
18 pin, 19 nut, 19b screw hole, 20 electric servomotor, 22, 25 roller chain, 24
Piston, 27 screw part, 28 screw hole, 31 feed bar, 32 crank angle detector, 33 controller, 3
4 ... gripping tool, 35 ... mistake detection sensor, 41 ... molded article detection means, 42 ... control command calculation means, 43 ... signal converter, 4
4 PLC, 45 motor control device, 46 die height setting means, 47 slide adjustment drive means, 48 die height detection means, 50 resolver (die height detector).

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B30B 15/14 B30B 15/14 A

Claims (8)

[Claims] Crankshaft (2) and upper part of crankshaft (2)
A connecting rod (5) which is fitted to the eccentric part of
(5) The rotatable leg is rotatably inscribed in a hole penetrating both ends of the bifurcated leg, and has a hole eccentric from the center axis of the inscribed hole, and the other end is eccentric at one end. An adjusting lever (6) swingable in a direction orthogonal to the axis of the hole; a wrist pin (8) inserted into the eccentric hole at one end of the adjusting lever (6); and a wrist pin (8). ), And a slide (4) supported on the body frame so as to be able to move up and down freely, and swing the other end of the adjustment lever (6) to rotate one end around the central axis. Then, in the slide adjusting device of the forging press for adjusting the slide position via the wrist pin (8) by this rotation, the swing of the other end of the adjusting lever (6) is controlled by the electric servomotor (20).
A slide adjusting device for a forging press, characterized by being driven by a forging press. 2. The slide adjusting device for a forging press according to claim 1, wherein the adjusting lever (6) is arranged perpendicular to the direction of raising and lowering the slide (4) and provided at the other end of the adjusting lever (6). A nut (19) having a screw hole (19b) substantially parallel to the vertical direction of the slide (4), and a nut (19) provided substantially parallel to the vertical direction of the slide (4). A slide adjusting device for a forging press, comprising: an adjusting screw shaft (17) screwed into (19b) and the other end rotated and driven by an electric servomotor (20). 3. The slide adjusting device for a forging press according to claim 1, wherein the adjusting lever (6) is arranged perpendicularly to the vertical direction of the slide (4) and is provided parallel to the vertical direction of the slide (4). An adjustment screw shaft (17a) having one end pin-connected to the other end of the adjustment lever (6) and having a screw portion at the other end portion; and a screw portion at the other end of the adjustment screw shaft (17a). Nut member screwed into 27) and rotationally driven by the electric servomotor (20)
(13) A slide adjusting device for a forging press, comprising: 4. A slide adjusting device for a forging press according to claim 1, 2 or 3, wherein a hole provided with an internal gear at an inner peripheral portion is formed at one end of said adjusting lever (6), and is formed in said hole. A forging press comprising an eccentric ring (7), which is rotatably driven through outer peripheral teeth meshing with the internal gear, and in which the eccentric hole for inserting the wrist pin (8) is formed. Slide adjustment device. 5. A molded article detecting means for detecting the presence or absence of a molded article in a mold, and a die height being set to a target value based on a target value of a die height preset according to a detection result of the molded article detecting means. In a slide adjusting device for a forging press, comprising a control command calculating means for calculating and outputting a control command to the slide position, a motor control means (45) for driving an electric servomotor (20) for adjusting the slide position. The control command calculating means (42) stores the optimum die height in advance in accordance with the presence / absence state pattern of a plurality of molds, and detects each die detected by the molded article detection means (41) during actual molding. The motor control means (4
5) A slide adjusting device for a forging press characterized by outputting to (5). 6. A slide adjusting device for a forging press according to claim 5, further comprising a die height detecting means (48) for detecting a die height, wherein the control command calculating means (42) detects the die height by the die height detecting means (48). A slide adjusting device for a forging press, comprising: calculating a deviation value by comparing the deviation value with the optimum die height; calculating a control command so as to reduce the deviation value; and outputting the control command to a motor control means (45). 7. A slide adjusting method of a forging press for detecting presence or absence of a molded product of a mold and adjusting a slide position based on a target value of a die height set in advance according to a result of the detection. The apparatus is operated at a predetermined die height set in advance, and then the molded product is sequentially conveyed onto a plurality of dies at each slide stroke, and the presence or absence of a molded product for each mold is detected at each slide stroke. , From the optimal die height stored in advance according to the presence / absence state pattern of the molded product of each mold,
Selecting the optimum die height based on the detected presence / absence state pattern of the molded product for each mold, and controlling the electric servomotor (20) to achieve the selected optimum die height, slide adjustment of the forging press, Method. 8. The slide adjusting method for a forging press according to claim 7, wherein a die height is detected during actual machining, a deviation value is calculated by comparing the detected die height with the selected optimum die height, and the deviation value is calculated. Electric servo motor (2
0) A slide adjusting method for a forging press, characterized by controlling (0).