JPH05248405A - Pressurizer of working machine - Google Patents

Abstract

PURPOSE:To surely hold the pressurizing state by locking a primary slide to the fixed side to enable mechanical reaction support. CONSTITUTION:A working machine is so constituted that a secondary slide 6 for pressurization is built in a primary slide 5 driven by oil hydraulics in such a manner as to be driven by the oil hydraulics and a mold 7 or the like is fitted to the secondary slide 6. In this working machine, the primary slide 5 is provided with a hydraulic cylinder 20 with a small diameter and capable of elevating rapidly, and the secondary slide 6 is provided with a hydraulic cylinder 25 with a large diameter, and can be pressurized with a small stroke. The primary slide 5 is mechanically locked on the fixed side of a platen 3 or the like by a hydraulically operated diameter enlarging and reducing clamper 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a forging press, a rolling mill,
The present invention relates to a pressure device such as mold clamping in a processing machine such as a die cast machine and an injection molding machine.

[0002]

2. Description of the Related Art Conventionally, as a pressurizing device of this type, a mold clamping device of a vertical aluminum casting machine shown in FIG. 9 has been known. In FIG. 9, 81 is a bed, 82 is four columns standing on the bed 81, 83 is a platen fixed to the upper end of the column 82, and 84 is a cylinder 85 formed in the platen 83.
A main ram that is fitted to the ram 84 in a vertically movable manner, 86 is a slide connected to the lower end of the ram 84, 87 is a cylinder for high-speed lowering concentrically provided in the ram 84, and 88 is inserted in the cylinder 87 and A ram whose upper end is fixed to the platen 83, and 89 is a bed
81 is an injection cylinder arranged below, 90 is an injection plunger,
91 and 92 are molds.

In this mold clamping device, the slide 86 is moved up and down at high speed by a cylinder 87 having a small cross-sectional area, and a mold 91 is used.
The main ram 84 having the same stroke is used to clamp and mold the pressurization and depressurization. Further, as another example of the mold clamping device of the vertical aluminum casting machine, a male screw part is provided on the upper part of the tie rod, and a large diameter cylinder and a half nut in two parts are externally fitted to the tie rod on the upper side of the upper slide. It is known that a base plate is fitted between a large-diameter cylinder and a half nut, the half nut is fixed to the base plate, and the half nut is vertically movable with respect to a tie rod and can be tightened. After fixing the half nut to the tie rod, the single-acting large-diameter cylinder is extended with respect to the base plate, and the upper mold attached to the upper slide is clamped to the lower mold.

Further, in the rolling mill, the upper housing is moved up and down by a small-diameter cylinder device provided on the side portions of the upper and lower housings, and pressurized and depressurized by a large-diameter cylinder device provided concentrically with the column on the upper housing. There is known a hydraulic pressure lowering device (see, for example, JP-A-3-1694).
No. 06 publication).

[0005]

By the way, in the above mold clamping device, since the main ram 84 performs the pressurization and depressurization, the pressurizing volume is large, and the pressurizing time and the depressurizing time by the compressibility of the hydraulic oil are large. In addition to being long, there is a problem that shock is likely to occur when switching the depressurization valve at the start of depressurization, and the flow rate of the hydraulic oil discharge / supply of the cylinder 85 in the main ram 84 at the time of high speed rise / fall is very large. However, there was a problem that the pipe diameter became large and it was necessary to install an oil tank near the main ram separately from the main tank to reduce pressure loss.

Further, in the mold clamping device provided with the fixing means by the half nut, the fixing position of the base plate cannot be arbitrarily selected because it can be adjusted only by the pitch of the screw and the tie rod is threaded, so that the strength of the tie rod is reduced. There is a problem of doing. Further, in the rolling reduction device of the rolling mill, since the fixing position of the collar with respect to the column is one place, all the roll gap adjustments depending on the type of rolling thickness and the like have to be performed by the cylinders for rolling reduction. Therefore, there is a problem that the stroke of the reduction cylinder becomes longer than the stroke required for reduction, the rigidity of the reduction cylinder decreases, and the responsiveness deteriorates.

The present invention has been made in view of the above situation, and an object thereof is to enable a reaction force receiver such as a primary slide to be fixed at an arbitrary position so that the reaction force can be supported reliably and firmly. Therefore, it is an object of the present invention to provide a pressurizing device for a processing machine capable of pressurizing and depressurizing in a short time by reducing the compression capacity of the pressurizing oil and capable of high response.

[0008]

In order to achieve the above object, the present invention takes the following technical means. That is, according to the present invention, in a processing machine in which a pressurizing secondary slide is incorporated into a hydraulically driven primary slide so as to be hydraulically driven, the primary slide has a hydraulic cylinder diameter reduced. The secondary slide can be pressurized with a small stroke by increasing the hydraulic cylinder diameter of the secondary slide, and the reaction force receiver of the primary slide or the like can be moved to a platen, column, etc. by a hydraulically driven diameter expansion / contraction clamper. The feature is that it is locked to the fixed side by frictional force.

[0009]

According to the present invention, when the primary and secondary slides are moved forward from the retracted position to perform presetting and pressurization, the working liquid in the diameter expansion / contraction clamper is first discharged to release the lock, and the primary slide is moved. After rapidly moving forward and stopping at an arbitrary position to set it in a preset state, the working liquid is supplied into the clamper to operate the clamper and lock the slide to the fixed side by frictional force, fixing the position of the primary slide. Then, after the preset state, the working liquid is supplied into the hydraulic cylinder of the secondary slide, and the secondary slide is advanced to the pressurized state. At this time, the reaction force due to the pressurization is supported by the clamper, and the pressed state of the secondary slide is reliably maintained.

In depressurizing and releasing the preset, after depressurizing the pressurizing cylinder or the depressurizing cylinder, the working liquid in the clamper is discharged to unlock the lock of the primary slide and operate in the cylinder of the slide. The liquid can be supplied or discharged to move both slides backward to reach the retracted position in a short time, and the working liquid can be supplied to the clamper again to lock the primary slide on the fixed side.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment in which the present invention is applied to a vertical aluminum casting machine, 1 is a bed, 2 is four columns erected on the bed 1, 3 is a platen, and 4 is Column 2 Frame fixed to the upper end, 5 is a primary slide, 6 is a secondary slide, 7 is a secondary slide 6 an upper mold removably mounted on the lower surface, 8 is a lower mold removably mounted on bed 1, 9 is the piston for the primary slide,
Reference numeral 10 is a piston rod, 11 is a diameter expansion / contraction clamper, 12 and 13 are hydraulic oil supply / discharge pipes, 14 is a pilot check valve, 15 is an electromagnetic hydraulic switching valve, 16 is a check valve, and 17 is an oil tank.

The platen 3 is attached to an upper portion of each column 2, and a primary slide fitting hole 18 penetrating in the vertical direction is provided in the center thereof, and the diameter expansion / contraction clamper 11 is fitted to the upper portion of the hole 18. The elastic sleeve of the clamper 11
A rod-shaped primary slide 5 is vertically slidably fitted in the inner surface of the 11A and in the primary slide fitting hole 18, and hydraulic oil is supplied from the oil passage 19 into the clamper 11 so that the elastic sleeve 11A is The primary slide 5 is fixed to the platen 3 via the clamper 11 by shrinking in the direction and pressing on the outer peripheral surface of the primary slide 5.

The primary slide 5 has a small-diameter, long-stroke hydraulic cylinder 20 for rapid ascent and descent formed in the upper center, and a large-diameter pressurizing piston 21 provided at the lower end. The piston 9 is fitted so that it can slide up and down. The piston rod 10 connected to the piston 9 penetrates the upper end of the primary slide 5,
Its upper end is attached to the frame 4 via a horizontal pin 22. Further, 23 is a hydraulic oil supply oil passage for the primary slide rapid rise, and 24 is a hydraulic oil supply oil passage for the primary slide rapid fall.

The secondary slide 6 is provided with a large-diameter hydraulic cylinder 25 in the center, and the primary slide is provided in the cylinder 25.
5 and the pressurizing piston 21 are fitted so as to be vertically movable with respect to the primary slide 5, and the pressurizing hydraulic oil supply / discharge passage 26
And a depressurizing hydraulic oil supply / discharge passage 27 are provided, and the supply / discharge pipes 12, 1 are provided.
3 is connected. In addition, below the bed 1,
Although not shown, an injection cylinder, an injection plunger, etc. are provided as in the conventional example, and molten aluminum is injected between the upper and lower molds 7 and 8.

In the first embodiment, when the upper mold 7 is lowered from the slide rising position shown in FIG. 1 to be closed with the lower mold 8, first, the primary slide 5 is mechanically attached to the platen 3 by the clamper 11. Since it is locked and in a fixed state, the hydraulic oil in the clamper 11 is discharged to be in the unlocked state, and then the hydraulic oil is supplied to the piston side oil chamber in the hydraulic cylinder 20 with a small diameter, so that the primary slide 5
And the secondary slide 6 both rapidly descends to the preset state.

Therefore, hydraulic oil is supplied into the clamper 11, and the primary slide 5 is moved to the platen by the clamper 11.
After locking to 3, hydraulic oil is supplied to the piston-side oil chamber of the large-diameter hydraulic cylinder 25 to lower the secondary slide 6, and the upper mold 7 is clamped to the lower mold 8 to bring it into a pressurized state. While maintaining the state, the aluminum melt is injected and injected into both molds 7 and 8.

At this time, the pressure reaction force is supported by the platen 3 from the primary slide 5 through the clamper 11,
The pressurized state is reliably maintained. After the aluminum in both molds 7 and 8 has solidified, the hydraulic oil in the piston side oil chamber of the large diameter cylinder 25 is discharged from the supply / discharge passage 26 and is supplied to the piston rod side oil chamber from the supply / discharge passage 27 to remove it. After pressurizing, the hydraulic oil in the clamper 11 is discharged to release the lock of the primary slide 5, and the hydraulic oil is supplied to the piston rod side oil chambers in both hydraulic cylinders 20 and 25, so that both slides 5 and 6 are released. Is rapidly raised, the upper mold 7 is positioned at the upper limit, and the molded product is taken out from the mold. Then, when casting is subsequently performed, the above-mentioned work may be repeated.

Further, since the primary slide 5 is locked when the mold is replaced, the work can be performed safely. In the first embodiment, the secondary slide
When a positioning accuracy of 6 is required, the electromagnetic proportional switching valve 15 shown in FIG. 2 should be used instead of the electromagnetic hydraulic switching valve 15 shown in FIG.
A is preferably provided, and a counter balance valve 28 and a check valve 29 are preferably provided between the pilot check valve 14 and the switching valve 15A.

FIGS. 3 and 4 show a second embodiment in which the present invention is applied to a vertical aluminum casting machine. The difference from the first embodiment is that the primary slide 5 is vertically moved by being guided by the column 2. , A radial expansion / contraction clamper 11 is fitted between the primary slide 5 and the column 2, and the primary slide 5 is supported and lifted via a hydraulic cylinder 20 for rapid lifting and a piston rod 10 which are erected on the side of the bed 1. That is the point.

A hydraulic cylinder 25 for the secondary slide 6 is formed on the primary slide 5 from the center of the lower side upward, and a depressurizing hydraulic oil supply / discharge passage 27 is formed at the center of the hydraulic cylinder 25 for pressurizing hydraulic oil supply. A discharge passage 26 is provided, and the secondary slide 6 is provided in the hydraulic cylinder 25 and the piston 30 formed at the upper end thereof.
Is slidably fitted. The operation of the primary and secondary slides 5 and 6 and the diameter expansion / contraction clamper 11 in the second embodiment is as follows.
Since this is the same as the first embodiment, the same reference numerals as in FIG.

5 and 6 show a third embodiment in which the present invention is applied to a rolling mill, 31 is a stand, 32 is an upper housing, 33 is a lower housing, 34 and 35 are rolls, 36 is a primary slide, 37 is a secondary slide, 38 is a primary piston, 39 is a piston rod, 40 is a diameter expansion / contraction clamper, 41 is a hydraulic circuit, 10
0 is a hydraulic unit. Although not shown in FIG. 5, there are two sets of step-up / down devices including a primary slide, a secondary slide, a primary piston, a piston rod, a diameter expansion / contraction clamp, and a hydraulic circuit in the longitudinal direction of the rolls 34 and 35. It is driven by the hydraulic unit 100 of.

Sliding holes 42, 43 for the primary and secondary slides 36, 37 are provided at the lower part of the stand 31 at upper and lower positions, and the outer end (lower end) of the piston rod 39 is provided at the lower end part. The primary slide sliding hole 42 is connected by a horizontal pin 44, and a diameter expansion / contraction clamper 40 is fitted in the primary slide sliding hole 42, and an oil passage 45 for supplying / discharging hydraulic oil is formed in the clamper 40.

The primary slide 36 has a cylindrical shape, and a small diameter hydraulic cylinder 46 for rapid ascent and descent is formed at the center of the lower end portion thereof, and a hydraulic fluid supply / discharging passage 48 for ascending and a hydraulic fluid supplying / discharging passage for descending hydraulic oil are provided.
47 is provided to move up and down in the clamper 40 and to be mechanically locked to the stand 31 by the clamper 40. The secondary slide 37 is fitted in the sliding hole 43 of the stand 31 so as to be vertically slidable, and supports the lower housing 33. A thick reduction hydraulic cylinder 49 is formed, an upper end portion of a primary slide 36 is fitted in the hydraulic cylinder 49 so as to be vertically slidable, and a reduction hydraulic oil supply / discharge oil passage 50 is provided at an upper portion.

The oil passages 45, 47, 48 and 50 are respectively provided with hydraulic circuits.
41 oil pipes 51, 52, 53, 54 are connected. The hydraulic circuit
41 is an electromagnetic switching valve 55, an electromagnetic proportional valve 56, a servo valve 57, a booster 58, pilot check valves 59, 60, 61, check valves 62, 63,
64, a relief valve 67, a pressure reducing valve 68, electromagnetic switching valves 69, 70, an accumulator 71, filters 72, 73, 74, a cooler 75, a hydraulic pump 76, a motor 77, and an oil tank 78.

In the hydraulic circuit 41, when it is desired to rapidly supply the hydraulic oil to the diameter expansion / contraction clamper 40, an accumulator 79 is provided between the electromagnetic switching valve 55 and the check valve 64 as shown in FIG. Can be connected. In the third embodiment, FIG. 5 shows the state where the lower housing 33 is located at the upper limit, the radial expansion / contraction clamper 40 is in the lock holding state, and the primary and secondary slides 36 and 37 are also located near the upper limit. is doing. When lowering the lower housing 33 from this state, the switching valve 55 is switched to discharge the hydraulic oil in the clamper 40, the lock of the primary slide 36 is released, and the servo valve 57 and the solenoid proportional valve 56 are switched. Primary and secondary slides
By rapidly lowering 36 and 37, they can be positioned at the lower limit. Then, if necessary, the primary slide 36 is locked to the stand 31 by the diameter expansion / contraction clamper 40.

Therefore, when raising the lower housing 33, first, the hydraulic oil in the clamper 40 is discharged to the unlocked state, and the solenoid proportional valve 56 is switched to switch the hydraulic cylinder.
Supply hydraulic oil to 46 and slide primary slide 36 to secondary slide
Raise it together with 37 to enter the roll gap preset state. Next, hydraulic oil is supplied to the inside of the clamper 40 to lock the primary slide 36, and then the servo valve 57 is operated to apply pressure corresponding to the rolled material to control the roll gap, that is, the plate thickness. The rolling reaction force acting on the lower housing 33 is transmitted to the stand 31 via the clamper 40 by mutual pressing frictional force. Further, although a large flow rate of hydraulic oil is instantaneously required for roll gap control, it can be handled at high speed by the accumulator 71 of the supply oil pipe 54A, and it is not necessary to increase the pump capacity.

In the third embodiment, since the rolling reaction force can be transmitted to the stand 31 by the clamper 40 and is mechanically held by the frictional force, the roll gap can be maintained reliably. The plate thickness rolling hydraulic cylinder 49 has a large diameter and a very short stroke, so that it has high rigidity, and therefore the responsiveness of the plate thickness control becomes high, and the plate thickness accuracy and quality can be improved.

FIG. 7 shows a fourth embodiment of the present invention. The difference from the second embodiment adopted in the vertical aluminum casting machine is that a reaction force receiving member is provided in the upper portion of the column 2 between the frame 4 and the primary slide 5. A base plate 101 as a body is arranged to be movable up and down, a secondary slide 102 is arranged concentrically with the column 2 between the base plate 101 and the primary slide 5, and a diameter expansion / contraction clamper 103 is arranged on the upper surface of the base plate 101. It is fixed concentrically with the column 2 and the upper mold 7 is attached to the lower surface of the primary slide 5.

The secondary slide 102 includes a large diameter hydraulic cylinder 104 having a donut shape and a piston 10 having a ring shape.
5 and the cylinder cover 106, the upper end of the piston 105 projects upward from between the cylinder 104 and the cylinder cover 106, and the upper end abuts the lower surface of the base plate 101.
With the 101 fixed to the column 2, the primary slide 5 is pressed downward to clamp the upper and lower molds 7 and 8.

As shown in FIG. 8, the diameter expansion / contraction clamper 103 is provided with a pressure resistant cylinder 107 that is fitted onto the column 2 so as to be slidable in the vertical direction, and is fitted into the cylinder 107 and is attached to the column 2. Slidable elastic sleeve 108
And a cylinder cover 109, and the clamper 103 is clamped or unclamped on the column 2 by pouring / discharging the hydraulic oil from the oil supply / discharge port 110 into the cylinder 107. Incidentally, 111 is a sealing material, and 112 is a base plate sliding guide.

In the fourth embodiment, when lowering the upper mold 7 by lowering the upper mold 7 from the primary slide rising position, first, the base plate 101 and the like are mechanically locked and fixed to the column 3 by the clamper 103. Since the hydraulic oil in the clamper 103 is discharged and the lock is released, the hydraulic oil is supplied to the oil chamber on the piston rod 10 side in the small diameter hydraulic cylinder 20 so that the primary slide 5 and the base plate 101 And the secondary slide 102 rapidly descends to the preset state.

Therefore, after supplying the working oil into the clamper 103 and locking the base plate 101 to the column 2 by the clamper 103, the working oil is supplied to the piston lower oil chamber in the hydraulic cylinder 104 of the secondary slide 102. Lower the primary slide 5 together with the hydraulic cylinder 104,
To the lower mold 8 and keep both molds 7 and
8 Inject the aluminum melt into the inside. At this time, the pressure reaction force is changed from the primary slide 5 to the secondary slide 102.
, The column 2 through the clamper 103 and the base plate 101.

After the aluminum in both the molds 7 and 8 is solidified, the hydraulic oil in the large diameter hydraulic cylinder 104 is discharged to depressurize it, and then the hydraulic oil in the clamper 103 is discharged to discharge the hydraulic oil in the base plate 101. The lock is released, hydraulic oil is supplied to the piston side oil chamber in the hydraulic cylinder 20, the slides 5, 102 and the base plate 101 are rapidly raised, the upper mold 7 is positioned at the upper limit, and the molded product is released from within the mold. Take out. When casting is subsequently performed, the above-mentioned work is repeated.

Also in the fourth embodiment, the rapid opening and closing of the mold and the pressurization of the mold can be rapidly performed, and the primary slide, that is, the upper mold is preset at an arbitrary position according to the size of the mold. be able to. The present invention is not limited to the above-described embodiment, can be modified in design as appropriate, and can also be used as a mold clamping processing device for upper and lower molds of a hydraulic forging press.

[0035]

As described above, the present invention provides a processing machine in which a pressurizing secondary slide is incorporated into a hydraulically driven primary slide so that the pressurizing secondary slide is hydraulically driven. The hydraulic cylinder diameter is reduced to enable rapid movement, the secondary slide is increased in hydraulic cylinder diameter to enable pressurization in a small stroke, and the reaction force receiver of the primary slide or the like is hydraulically driven. Since the expansion and contraction clamper locks the fixed side of the platen, column, etc. by frictional force, the primary slide can be moved rapidly and the secondary slide can be compressed by its hydraulic oil. The capacity can be reduced, pressurization and decompression can be performed in a short time, and high response is possible, and the reaction force can be reliably fixed by mechanically locking the reaction force receiver such as the primary slide at any position. Can be transmitted absorbed, the preset state can be reliably held, the mold replacement, roll exchange can be improved workability and machining precision machining such as of course.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram showing a modified example of the hydraulic circuit in FIG.

FIG. 3 is a partially cutaway front view showing a second embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a pressurizing hydraulic cylinder and the like in FIG.

FIG. 5 is a partially cutaway front view showing a third embodiment of the present invention.

FIG. 6 is a hydraulic circuit diagram showing a modified example of the hydraulic circuit for the diameter expansion / contraction clamper in FIG.

FIG. 7 is a partially cutaway front view showing a fourth embodiment of the present invention.

FIG. 8 is an enlarged detailed view of a portion A in FIG.

FIG. 9 is a partially cutaway front view showing a conventional example.

[Explanation of symbols]

 2 Column 3 Platen 5 Primary slide 6 Secondary slide 11 Diameter expansion / contraction damper 20 Small diameter hydraulic cylinder 25 Large diameter hydraulic cylinder 31 Stand 36 Primary slide 37 Secondary slide 40 Diameter expansion / contraction clamp 46 Small diameter hydraulic cylinder 49 Large diameter hydraulic cylinder 101 Base plate Force receiver) 102 Secondary slide 103 Diameter expansion / contraction clamper 104 Large diameter hydraulic cylinder

Claims (1)

[Claims] 1. A primary slide driven by hydraulic pressure,
In a processing machine in which a secondary slide for pressurization is driven by hydraulic pressure, the primary slide has a small hydraulic cylinder diameter to enable rapid movement, and the secondary slide has a hydraulic cylinder diameter. It is characterized in that it can be pressurized by a large stroke and the reaction force receiver such as the primary slide is locked by frictional force to the fixed side of the platen, column, etc. by a hydraulically driven diameter expansion / contraction clamper. Pressurizing device for processing machines.