JP2021049544A - Molding device - Google Patents

Abstract

To accurately detect an inclination between molds.SOLUTION: A molding device includes: a pair of molds 3 and 4; a first die holder 28 that holds one of the pair of molds; a second die holder 24 that holds the other of the pair of molds; a drive mechanism 20 that relatively moves the first die holder and the second die holder so as to contact with or separate from each other; a guide mechanism 50 that is provided between the first die holder and the second die holder to guide the contacting/separating movement; and a detection device 60 that detects a distance between the first die holder and the second die holder. The guide mechanism has an inserting portion 51 and an inserted portion 52, and the detecting device is partially or completely disposed in the inside of the guide mechanism.SELECTED DRAWING: Figure 2

Description

The present invention relates to a molding apparatus using a mold.

In a conventional molding apparatus, for example, a forging press, a shut height detector is provided in the vicinity of the upper die to detect the distance from the upper die to the bed surface (see, for example, Patent Document 1).

JP-A-2002-239799

In a molding apparatus using a mold, if there is an inclination between the molds, there arises a problem that the processing accuracy is lowered.
In the conventional forging press, the frame is stretched due to the press load during molding, elastic deformation of each part, thermal expansion of each part when preheating the die, and the sliding part between the slide supporting the upper die and the frame. Tilt between the molds can occur due to various causes such as tilt of the slide due to the provided gap and change in the oil film thickness of the lubricating oil.
However, with the above-mentioned conventional forging press, although it is possible to obtain the shut height, which is the distance from the lower surface of the slide to the upper surface of the bed, it is not possible to detect the inclination between the dies.

An object of the present invention is to detect the inclination between molds more accurately.

The molding apparatus according to the present invention includes a pair of dies, a first die holder that holds one of the pair of dies, a second die holder that holds the other of the pair of dies, the first die holder, and the above. A drive mechanism for relatively moving the second die holder in contact with each other, a guide mechanism provided between the first die holder and the second die holder to guide the movement in contact with the second die holder, and the first die holder and the first die holder. The guide mechanism includes a detection device for detecting the distance between the two die holders, the guide mechanism has an insertion portion and an insertion portion, and the detection device is partially or wholly arranged inside the guide mechanism. The configuration is as follows.

According to the present invention, it is possible to more accurately detect the inclination between the molds.

It is a block diagram which shows the forging press apparatus which concerns on embodiment of an invention. It is a cross-sectional view which enlarged and showed the structure around the upper mold and the lower mold with the upper mold raised. It is a cross-sectional view which enlarged and showed the structure around the upper mold and the lower mold with the upper mold lowered. It is a top view of the lower die holder. It is the cross-sectional view which showed the structure around the upper mold and the lower mold provided with a water cooling device in an enlarged manner.

[Outline configuration of forging press]
The forging press device 10 as a molding device according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a configuration diagram showing a forging press device 10.

The forging press device 10 includes a bed 23, a plurality of uprights 22, a crown 21, an upper die holder 28 as a first die holder, a lower die holder 24 as a second die holder, a slide 18, an upper die 3 as a pair of dies, and the like. It includes a lower mold 4, a drive mechanism 20, and a control device 90.

The bed 23, the plurality of uprights 22, and the crown 21 form a frame portion of the forging press device 10. The bed 23, the plurality of uprights 22, and the crown 21 are fastened to each other by passing the tie rod 25a inside and tightening the tie rod nut 25b. Four guides 19 (partially not shown) are provided for each of the two uprights 22 arranged on the left and right. The slide 18 can be moved up and down by four guides 19. The moving direction of the slide 18 does not have to be the vertical direction.

A hard plate 27 is mounted on the lower portion of the slide 18, and an upper die holder 28 is further mounted on the lower portion thereof. Then, the upper mold 3 which is one of the pair of dies is fixed to the lower surface of the upper die holder 28. The forging press device 10 includes a plurality of pairs of dies, and the plurality of upper dies 3 are arranged in a row along the longitudinal direction of the eccentric shaft 16 described later. Further, although FIG. 1 shows three upper molds 3, the number of individuals can be increased or decreased.

The lower die holder 24 is fixed to the bed 23 via the hard plate 26. The lower die holder 24 is a component to which the lower die 4 which is the other side of the pair of dies is fixed. The plurality of lower dies 4 are arranged in a row on the lower die holder 24 along the length of the eccentric shaft 16 described later. Further, although FIG. 1 shows three lower molds 4, the number of individuals can be increased or decreased.

The upper die holder 28 and the lower die holder 24 can be relatively moved in contact with each other by the drive mechanism 20. Specifically, the upper die holder 28 moves in contact with the lower die holder 24 by moving the slide 18 up and down.
The upper molds 3 held by the upper die holder 28 and the lower molds 4 held by the lower die holder 24 are individually arranged to face each other, and are close to each other when the slide 18 is lowered. When the molding material is put between the upper mold 3 and the lower mold 4 facing each other, the molding material is pressurized in the mold space of the upper mold 3 and the lower mold 4 by lowering the slide 18. And the molding material is forged.
It is sufficient that the upper die holder 28 and the lower die holder 24 can move relative to each other so as to be close to each other and separated from each other, and the lower die holder 24 may be configured to move in contact with and separate from the upper die holder 28. Both the 28 and the lower die holder 24 may be configured to move in contact with each other.

The forging press device 10 includes a servomotor 11, a transmission shaft 14, a speed reducer 15, an eccentric shaft 16, and a connecting rod 17 as a configuration for raising and lowering the slide 18, and these constitute a drive mechanism 20.

The servomotor 11 is fixed to the side surface of the frame portion such as the crown 21 or the upright 22. The servomotor 11 can be controlled to arbitrarily change the rotation speed during one rotation or to stop at an arbitrary rotation angle. Therefore, it is possible to change the moving speed of the up and down movement of the slide 18 in one stroke, or to stop the slide 18 at an arbitrary position.

The servomotor 11 is arranged on one end side of the transmission shaft 14 in the axial direction. The output shaft of the servomotor 11 is directly connected to one end of the transmission shaft 14.
The speed reducer 15 is arranged near the other end of the transmission shaft 14 in the axial direction, that is, near the opposite end of the servomotor 11. The servomotor 11 and the speed reducer 15 are arranged coaxially with the eccentric shaft 16.

The main shaft portion 16a of the eccentric shaft 16 is rotatably supported by a frame portion such as a crown 21 or an upright 22 via a bearing 41.
The eccentric shaft 16 has a hollow portion penetrating along the rotation center axis. The transmission shaft 14 is arranged in the hollow portion so as to be relatively rotatable and coaxial with the eccentric shaft 16. The transmission shaft 14 transmits the rotational force of the servomotor 11 to the speed reducer 15. The speed reducer 15 decelerates the rotational movement of the transmission shaft 14 and transmits it to the eccentric shaft 16.

The eccentric shaft 16 has an eccentric portion 16b that is eccentric with respect to the spindle portion 16a, and the eccentric portion 16b is connected to the connecting rod 17. The connecting rod 17 connects the eccentric shaft 16 and the slide 18, converts the rotational motion of the eccentric shaft 16 into a linear motion, and transmits the linear motion to the slide 18.

As described above, the eccentric shaft 16 is subjected to rotational force from the servomotor 11 via the speed reducer 15. Since the eccentric shaft 16 is configured to rotate once in one cycle of the forging press device 10, the slide 18 moves up and down in the vertical direction at a low speed with respect to the rotation speed of the servomotor 11.
The drive source of the drive mechanism 20 is not limited to the servomotor 11 capable of arbitrarily controlling the rotation speed and the shaft angle, and may be a general motor. In that case, it is preferable to provide a flywheel, a clutch brake mechanism, or the like between the motor and the eccentric shaft.

A nozzle 40 for spraying a lubricant on the upper mold 3 and the lower mold 4 is provided between the upper mold 3 and the lower mold 4.
Further, in the vicinity of the upper die 3 and the lower die 4, a transfer feeder (not shown) is provided as a material supply device for supplying the molding material to the press-processed portion. When the upper mold 3 and the lower mold 4 are separated from each other, the transfer feeder supplies new molding materials to the lower mold 4 and the upper mold 3 on the most upstream side, or a plurality of transfer feeders arranged in a row. The workpieces are sequentially conveyed to the lower mold 4 and the upper mold 3.

[Guide mechanism]
2 and 3 are an enlarged cross-sectional view showing the peripheral configurations of the upper mold 3 and the lower mold 4, and FIG. 4 is a plan view of the lower die holder 24 as viewed from above. Note that in FIGS. 2 and 3, some configurations such as the hard plates 26 and 27 are not shown.
As shown in FIGS. 2 and 4, the lower die holder 24 has a rectangular shape in a plan view, and although not shown, the upper die holder 28 also has the same shape in a plan view.
Four guide mechanisms 50 are individually provided between the lower die holder 24 and the upper die holder 28 at the four corners of the lower die holder 24 and the upper die holder 28 in a plan view.

Each guide mechanism 50 includes a cylindrical guide post 51 as an insertion portion erected vertically upward from the upper surface of the lower die holder 24, and an inserted portion hung vertically downward from the lower surface of the upper die holder 28. It is provided with a cylindrical guide post holder 52 as a.
The guide post 51 is fixedly mounted on the upper surface of the lower die holder 24 via the mounting sleeve 53 in a state of being erected vertically above.

The guide post holder 52 is fixedly equipped with its upper end inserted into a bottomed hole provided on the lower surface of the upper die holder 28.
The lower end of the guide post holder 52 is equipped with a packing 54 for maintaining airtightness with the guide post 51. The packing 54 has a valve structure that suppresses the intrusion of outside air, dust, and other foreign substances into the guide post holder 52, and facilitates the discharge of gas from the inside of the guide post holder 52.

The guide post 51 is inserted inward from the lower end of the guide post holder 52 and can move up and down along the guide post holder 52.
That is, each guide mechanism 50 can guide the vertical movement of the upper die holder 28 with respect to the lower die holder 24 at each position of the four corners of the lower die holder 24 and the upper die holder 28.

Further, the upper die holder 28 is formed with an air supply port 282 as an air supply unit facing the opening at the upper end of each guide post holder 52. The air supply port 282 is connected to a high-pressure air supply source (pump or the like) (not shown), and air of a predetermined pressure is supplied to the internal space of the guide post holder 52.
As a result, air flows out from the gap between the guide post 51 and the guide post holder 52, that is, from the packing 54. In particular, as shown in FIG. 3, even when the upper die holder 28 is lowered, excess air flows out from the packing 54 to the outside, and dust and other foreign substances are suppressed from entering the guide post holder 52. be able to.

[Detector]
The forging press device 10 includes four detection devices 60 that detect the distance between the upper die holder 28 and the lower die holder 24.
Each detection device 60 is provided between the upper die holder 28 and the lower die holder 24 at the four corners of the upper die holder 28 and the lower die holder 24, and a part of the configuration of each detection device 60 is arranged inside the guide mechanism 50. ing.
Each detection device 60 is a so-called magnetostrictive displacement sensor, and includes a probe 61, a permanent magnet 62, and a main body 63.

The probe 61 is a round bar-shaped tubular body that stores the magnetostrictive wire.
The permanent magnet 62 has a ring shape and is used with the probe 61 loosely inserted. The permanent magnet 62 is not limited to the ring shape, and may be arranged in the vicinity of the probe 61.
The main body 63 is provided at one end of the probe 61, and houses a pulse generating circuit for passing a pulse current through the magnetostrictive wire and a strain sensor for detecting the torsional strain of the magnetostrictive wire.

Within the probe 61, the magnetostrictive wires are stored and arranged parallel to the longitudinal direction of the probe 61. Then, when a pulse current is passed through the magnetostrictive wire with the probe 61 loosely inserted into the permanent magnet 62, the magnetostrictive wire momentarily undergoes torsional distortion in the vicinity of the permanent magnet 62 due to the Wiedemann effect. Then, the time from the pulse energization until the strain sensor detects the torsional strain at one end of the probe 61 is measured, and the distance (displacement) from the main body 63 to the permanent magnet 62 is calculated by multiplying the strain propagation speed. It can be detected.

The main body 63 of each detection device 60 is mounted in recesses 281 formed at the four corners of the upper surface of the upper die holder 28.
The probe 61 penetrates the upper die holder 28 and extends vertically in the vertical direction.
The guide post 51 of each guide mechanism 50 is formed with an insertion hole 511 into which the probe 61 is inserted at the center position of the upper end portion thereof. A permanent magnet 62 is attached to the upper end of the guide post 51 so as to surround the insertion hole 511.
Therefore, by inserting the probe 61 into the insertion hole 511 of the guide post 51, the probe 61 is loosely inserted inside the permanent magnet 62.
As a result, almost all of the probe 61 and the permanent magnet 62 constituting the detector body of the detection device 60 are arranged inside the guide mechanism 50.

When the upper die holder 28 moves up and down with respect to the lower die holder 24, the relative vertical positions of the permanent magnet 62 and the probe 61 change, so that the distance from the main body 63 to the permanent magnet 62 is detected. Thereby, the distance between the upper die holder 28 and the lower die holder 24 in the vertical direction can be detected.
Further, since the detection devices 60 are provided at the four corners of the upper die holder 28 and the lower die holder 24, each detection device 60 individually detects the mutual distance between the upper die holder 28 and the lower die holder 24 in the vertical direction. , It is possible to obtain the inclination between the upper mold 3 and the lower mold 4.

[Control device]
The control device 90 is an information processing device such as a microcomputer that performs a process of obtaining an inclination between the upper mold 3 and the lower mold 4 according to a program.
As described above, the control device 90 is connected to the pulse generation circuit and the strain sensor in the main body 63 of each detection device 60, and is located between the upper die holder 28 and the lower die holder 24 at the four corners of each detection device 60 in the vertical direction. Get the distance.
Then, the control device 90 determines whether or not the variation in the vertical distance between the four corners of the upper die holder 28 and the lower die holder 24 is within an allowable range. As a result, when the allowable range is exceeded, the display device 91 connected to the control device 90 is displayed with a notification screen indicating that the inclination between the upper mold 3 and the lower mold 4 exceeds the allowable range. Execute the notification process.
Further, when the inclination between the upper die 3 and the lower die 4 exceeds the permissible range, control may be performed to prohibit the subsequent forging press work.

Further, the control device 90 calculates how much the upper die holder 28 and the lower die holder 24 are tilted from the vertical distances of the four corners in the vertical direction, and displays them on the display device 91. As a result, the operator can correct the inclination by reassembling, adjusting, or the like of the upper mold 3 and the lower mold 4, or the upper die holder 28 and the lower die holder 24.

[Operation control of forging press]
The forging press operation of the forging press device 10 will be described.
The slide 18 has an operation pattern in which the rotation drive for one rotation of the eccentric shaft 16 by the servomotor 11 is set as one stroke, the top dead center, which is the retracted position, passes through the bottom dead center where press molding is performed, and the slide 18 returns to the top dead center. Reciprocate in the vertical direction.
As a result, the upper die holder 28 moves up and down while being guided by the four guide mechanisms 50, and at the bottom dead center, the molding material is pressed by the upper die 3 and the lower die 4 to perform a forging press.
On the other hand, during the forging press operation, the control device 90 calculates the vertical distances between the four corners of the upper die holder 28 and the lower die holder 24 from each detection device 60 in a short cycle, and the upper die 3 and the lower die The permissible determination of the inclination between the four and the calculation of the inclination direction and the inclination angle are executed.
Then, if the inclination between the upper mold 3 and the lower mold 4 is out of the permissible range, the notification process is executed. Further, regardless of the determination result, the inclination direction and the inclination angle between the upper mold 3 and the lower mold 4 are displayed on the display device 91.

[Technical Effects of Embodiments of the Invention]
In the forging press device 10, a part of each detection device 60 is individually arranged inside each guide mechanism 50. Since each guide mechanism 50 guides the vertical movement of the upper die holder 28, if the configuration of each detection device 60 is arranged inside each guide mechanism 50, the displacement along the vertical movement of the upper die holder 28 is detected more accurately. It becomes possible to do. Therefore, the inclination between the upper mold 3 and the lower mold 4 can be detected more accurately.

Further, conventionally, various configurations such as a transfer feeder for handling a workpiece and a lubricating oil supply device are provided around the upper mold and the lower mold, and a space for providing a sensor for detecting an inclination between the molds is provided. It was practically difficult to secure.
However, by arranging a part of the detection device 60 inside the guide mechanism 50, it is possible to easily secure the mounting space for the detection device 60.
Further, even when the shapes of the upper mold 3 and the lower mold 4 are changed to various complicated shapes, a part of the detection device 60 is arranged inside the guide mechanism 50, so that the upper mold 3 is used. And the lower mold 4 are less likely to be affected, and proper detection can be performed stably.
Further, when the upper mold 3 and the lower mold 4 are heated or the forming material is heated, the oxide scale generated by the heating of the molding material and the vaporized lubricant are likely to adhere. Although the surrounding environment also becomes hot, the detection device 60 can be protected inside the guide mechanism 50 even when the surroundings of the upper mold 3 and the lower mold 4 are in such a harsh environment, and the surroundings can be protected. It is possible to reduce the influence of the environment and perform detection. As a result, it is possible to suppress the failure of the detection device 60 and realize a long life.

Further, since the guide mechanism 50 and the detection device 60 are provided with at least three or more, specifically four, the upper mold 3 and the lower mold 4 are relatively tilted in any direction by the four-point detection. It becomes possible to detect in detail whether or not the above occurs.

Further, since the upper die holder 28 is provided with an air supply port 282 for supplying air into the guide post holder 52 of each guide mechanism 50, it is assumed that air is discharged from the gap between the guide post holder 52 and the guide post 51. Therefore, it is possible to suppress the intrusion of foreign matter such as moisture and dust from the gap, suppress the influence of the foreign matter on the internal detection device 60, and perform good detection.

[Other]
Each embodiment of the present invention has been described above. However, the present invention is not limited to each of the above embodiments. The details shown in each embodiment can be appropriately changed without departing from the spirit of the invention.
For example, the case where four guide mechanisms 50 and four detection devices 60 are provided is illustrated, but the number of these can be increased or decreased. Further, the numbers of the guide mechanism 50 and the detection device 60 do not necessarily have to match, and the number of the guide mechanism 50 may be larger than that of the detection device 60. However, when determining the direction of mutual inclination between the upper mold 3 and the lower mold 4, it is preferable to provide three or more detection devices 60.

Further, the configuration in which the probe 61 and the permanent magnet 62 of the detection device 60 are arranged inside the guide mechanism 50 and the main body 63 is arranged outside the guide mechanism 50 has been illustrated, but the present invention is not limited thereto. For example, the main body 63 may also be arranged inside the guide post holder 52 of the guide mechanism 50, and the entire detection device 60 may be arranged inside the guide mechanism 50.

Further, as shown in FIG. 5, a water cooling device may be provided on the guide post 51 of each guide mechanism 50. The water cooling device includes a cooling water flow path 55 formed over the entire length of the guide post 51. The flow path 55 extends from the lower end surface of the guide post 51 to the vicinity of the upper end portion, and is formed so as to be folded back near the upper end portion and exit to the lower end surface of the guide post 51.
Further, the lower die holder 24 is formed with a cooling water supply port 241 communicating with one end of the flow path 55 and a cooling water discharge port 242 communicating with the other end of the flow path 55. 241 is connected to a source of cooling water.
In this way, when the water cooling device is provided in each guide mechanism 50, even when the surrounding temperature rises, the temperature rise of the detection device 60 is suppressed, the influence of the temperature is suppressed, and good tilt detection is performed with high accuracy. It becomes possible.
The water cooling device is not limited to the guide post 51, and may be provided on the guide post holder 52 side. In that case, similarly to the guide post 51, the cooling water flow path may be formed in the guide post holder 52, or the water cooling device may be configured by a tubular water jacket attached to the outer circumference of the guide post holder 52. good.

Further, the air supply port 282 for supplying air to the guide post holder 52 of each guide mechanism 50 may be connected to the oil supply source and modified so that the oil can be supplied into the guide post holder 52. In this case, instead of the packing 54 of the valve structure, it is preferable to have a seal structure in which the oil pressure from the inside does not leak.
As a result, when it is detected that an inclination is generated between the lower mold 4 and the upper mold 3, the inclination is alleviated by adjusting the hydraulic pressure on one of the guide post holders 52. Is possible.
The hydraulic pressure supply path to each guide post holder 52 is provided with an accumulator for each hydraulic pressure supply path, and the hydraulic oil moves to the accumulator when the upper die holder 28 is lowered by the forging press. It is possible to alleviate the inclination between the lower mold 4 and the upper mold 3 while sufficiently reducing the influence on the work.

Further, in the above embodiment, the forging press device is exemplified as the molding device, but the above-described configuration of the guide mechanism 50 and the detection device 60 can be applied to any molding device using a die.
For example, a tubular molding material is heated and softened, then sandwiched between an upper mold and a lower mold, and high-pressure air is supplied from both ends of the molding material to the inside to expand and expand molding into a target shape. The guide mechanism 50 and the detection device 60 may also be provided in the molding apparatus or the like. In this case as well, it is possible to satisfactorily detect the inclination between the upper mold and the lower mold.

3 Upper die 4 Lower die 10 Forging press device (molding device)
11 Servo motor 14 Transmission shaft 15 Reducer 16 Eccentric shaft 17 Connecting rod 18 Slide 19 Guide 20 Drive mechanism 24 Lower die holder (second die holder)
26, 27 Hard plate 28 Upper die holder (first die holder)
40 Nozzle 50 Guide mechanism 51 Guide post (insertion part)
52 Guide post holder (inserted part)
55 Channel (water cooling device)
60 Detection device 61 Probe 62 Permanent magnet 63 Main body 90 Control device 91 Display device 241 Supply port 242 Discharge port 282 Air supply port (air supply unit)

Claims (4)

A pair of molds and
A first die holder that holds one of the pair of molds,
A second die holder that holds the other of the pair of molds,
A drive mechanism for relatively moving the first die holder and the second die holder in contact with each other,
A guide mechanism provided between the first die holder and the second die holder to guide the contact / separation movement, and
A detection device for detecting the distance between the first die holder and the second die holder is provided.
The guide mechanism has an insertion portion and an insertion portion, and has an insertion portion and an insertion portion.
The detection device is a molding device in which a part or all of the detection device is arranged inside the guide mechanism. The molding apparatus according to claim 1, further comprising at least three or more of the guide mechanism and the detection apparatus. The molding apparatus according to claim 1 or 2, further comprising an air supply unit that supplies air into the inserted portion of the guide mechanism. The molding apparatus according to any one of claims 1 to 3, wherein the insertion portion of the guide mechanism or the insertion portion is provided with a water cooling device.

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