JP2763391B2 - Crankshaft torsion forming press - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press for torsion-forming a forged crankshaft material by a press-down torsion method.

[Conventional technology] Conventionally, when a forged crankshaft material is torsion-formed, a twist-only press (twister) and a coining-only press are used. First, the crankshaft material is twisted and then conveyed to a coining-only press. The coining process (correction process) was performed.

[Problems to be Solved by the Invention] Twist forming of a crankshaft requires two independently arranged presses. Therefore, a dedicated work transfer equipment and a work of a dedicated coining press are provided between the two presses. The loading unit also needs a device for adjusting the posture of the work using various detection devices. Therefore, the equipment becomes complicated and large, and there are problems in terms of operability and maintainability, equipment space, and equipment cost. In addition, there is an inconvenience that automation and quality control by a transfer feeder for improving productivity are difficult.

[Object of the Invention] The present invention has been made to solve the above problems,
An object of the present invention is to enable torsion molding and coining molding in the same press.

[Means for Solving the Problems] molding press torsional crankshaft of the invention, as illustrated, the upper bolster 12 and attached to the slide 10 of the vertically movable in the main cylinder is provided over the press frame ₁
Formed by attaching each upper mold of the twisting die 13 and the coining die apparatus 23, the lower die bed 2 for twisting the lower bolster 12 ₂ which is mounted on the die 13 and the coining die apparatus 23 to In the press for torsion forming of crankshaft,
The two main cylinders are arranged side by side, and the slide 10 is connected to the tip of the ram of the main cylinders 7 and 8, and the main cylinders 7 and 8 are twisted between the slide 10 and the bed 2 around the respective axes of the main cylinders 7 and 8. The twisting die device 13 and the coining die device 23 are arranged so that the center P and the coining center Q are located, and the split surface of the twisting die device 13 and the split surface of the coining die device 23 are at the same height. The above object is achieved by such a configuration.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

The press frame includes a crown 1, a bed 2, and a column 3. Then, the crown 1 and the bed 2 are vertically opposed to each other with the four columns 3 interposed therebetween.
The nuts 5 are fastened to each other via tie rods 4 penetrating through the column 3. The press frame is installed with the bed 2 fixed on a machine foundation 6.

The crown 1 has two main cylinders 7 and 8 arranged side by side in the work transfer direction (the left-right direction in FIG. 1) so as to substantially coincide with an interval between two sets of dies (described later). 3 is provided with a lifting cylinder 9 respectively. The slide 10 is vertically guided by the column 3 via the guide 11, and is connected to the tip of the ram of the main cylinders 7 and 8 and the tip of the piston of the lifting cylinder 9, so that the slide 10 can be moved up and down along the column 3. .

An upper bolster 12a is mounted on the lower surface of the slide 10, and a lower bolster 12b is mounted on the upper surface of the bed 2.

The torsion die 13 is disposed on the work carry-in side between the bed 2 and the slide 10 so that the torsion center P (rotation center) is located on the center axis of the main cylinder 7. Then, the upper bolster 12a and the lower bolster 12b are provided on the work loading side with the upper retainer rotary support device 14a, the lower retainer rotary support device 14b, the upper die fixed support device 15a, the lower die fixed support device 15b, and the upper retainer 16a and the lower retainer, respectively. 16b are provided facing up and down.

That is, the upper fixed die supporting device 1 is attached to the upper bolster 12a.
5a ₁ and 15a ₂ are fixed, and the upper fixed die supporting device 1
5a _1, directly on one side or upper bolster 12a of 15a ₂ upper retainer rotating support device 14a ₁ to 14A ₃ are mounted.

Then, the upper retainer rotary support device 14a ₁ to 14A ₃ upper retainer 16a ₁ ~16a ₃ is rotatably supported.

On the other hand, the lower bolster 12b, the lower retainer rotary support device 14b ₁ ~14b ₃ and the lower fixed die supporting device 15b _1, 15b ₂ are mounted alternately along the direction orthogonal to the workpiece transfer direction. Then, the respective lower retainer 16b ₁ ~16b ₃ is rotatably supported to the lower retainer rotary support device 14b ₁ ~14b _3.

An upper die 17a is mounted on the upper retainer 16a, and a lower die 17b is mounted on the lower retainer 16b. A roller 19 is provided on the side of the upper retainer 16a via an arm 18 which projects alternately obliquely upward. The roller 19 has a hole 20 provided below a plate-like pressing ram 20 arranged in a direction perpendicular to the workpiece transfer direction.
Inserted in a. Further, the press-down ram 20 is connected to a press-down cylinder 2 through a rod 21 that penetrates the upper bolster 12a.
Connected to 2. Then, the upper and lower dies 17a, 17b
Is the rotation center (torsion center P) determined by the upper retainer rotation support device 14a and the lower retainer rotation support device 14b.
Are arranged on the center axis of the main cylinder 7.

The coining die 23 is disposed between the bed 2 and the slide 10 and adjacent to the torsion die 13 on the work discharge side so that the coining center Q is located on the center axis of the main cylinder 8. That is, the upper die fixing device 24a and the lower die fixing device 24b are respectively disposed on the work discharge side of the upper bolster 12a and the lower bolster 12b, and the upper die 25a is attached to the upper bolster 12a by the upper die fixing device 24a.
The lower die 25b is mounted on the lower bolster 12b by the lower die fixing device 24b.

The upper and lower dies 25a, 25b are arranged such that their centers (coining centers Q) are located on the central axis of the main cylinder 8.

As shown in FIG. 5, the split die surfaces of the torsion die device 13 and the coining die device 23 have the same height so that the work can be conveyed by a clamp-type truss feeder.

Next, a control circuit of the crankshaft twist forming press according to the present invention will be described with reference to FIG.

A check valve 28 is provided on the discharge side pipe 27 of the variable discharge hydraulic pump 26, and the discharge side pipe 27 is provided with a check valve 28.
At the subsequent stage, the pipe is branched into four pipes 29 to 31.

Then, the first pipe 29 of the four branched pipes
Is connected to the main cylinder 7 via a 2-port 2-position electromagnetic switching valve 33 and a check valve 34. The second conduit 30 is also connected to the main cylinder 8 via a 2-port 2-position electromagnetic switching valve 35 and a check valve 36.

Further, the third conduit 31 is connected to the rod side of the pull-up cylinder 9 via a 2-port position electromagnetic switching valve 37 with a variable throttle. Furthermore, a 4-port position electromagnetic switching valve 40 is provided in the fourth conduit 32, and one outlet port of the electromagnetic switching valve 40 is connected to the conduit 42 via a check valve 41 with a variable throttle. The other outlet port is connected to the rod side of the press-down cylinder 22 via a pipe line 44 via a check valve 43 with a variable throttle.

The fourth line 32 is branched before the 4-port 3-position electromagnetic switching valve 40 in accordance with the operation of the press-down cylinder 22, and the 4-port 3-position electromagnetic switching valve 40 and the variable throttle are respectively connected to the branch circuits. Check valves 41 and 43 are provided.
The pressure oil supplied to and discharged from the press-down cylinder 22 may be controlled by adjusting the pressures 1 and 43.

An external pilot type relief valve 45 is connected to the discharge side line 27 of the hydraulic pump 26 at a stage subsequent to the check valve 28, and the external pilot line 46 of the relief valve 45 has a two-port two-position electromagnetic switching. A valve 47 and a low-pressure relief valve 48 are provided in series, and a high-pressure relief valve 49 is provided in parallel with them.The relief pressure of the external pilot relief valve 45 is switched between high pressure and low pressure by selectively switching the electromagnetic switching valve 47. It is possible.

The first pipe 29 and the second pipe 30 are connected to a check valve 34.
And 36, are connected via check valves 50a, 50b that allow outflow from the pipes 29 and 30 side, and the pipe 51 branched from between these check valves 50a, 50b is variably restricted. Tank via valve 52 and 2-port 2-position electromagnetic switching valve 53
Open to 54. Further, the main cylinders 7 and 8 are connected to the tank 54 by lines 57 and 58 via pilot check valves 55 and 56.

The pilot ports of the pilot check valves 55 and 56 are connected to a pilot pressure source (not shown). The opposite side of the pulling cylinder 9 from the rod is connected to a tank 54 by a conduit 59.

Further, the third conduit 31 has a two-port 2 port with a variable throttle.
A line 61 provided with a two-port two-position solenoid-operated switching valve 60 with a variable throttle branching from the latter stage of the position solenoid-operated switching valve 37, and a pipeline 64 provided with a two-port-position solenoid-operated switching valve 62 and a relief valve 63 in series
And a line 66 provided with a safety relief valve 65 are provided in parallel with each other, and the respective lines 61, 64, 66 are open to the tank 54.

Next, the operation procedure of the crankshaft torsion forming press of the present invention will be described.

In the state shown in FIG.
Is held at the raised position, and the main cylinders 7, 8 and the push-down cylinder 22 are also retracted.

a) Lowering operation of the slide From the state shown in FIG. 7, the two-port two-position electromagnetic switching valve 60 with a variable throttle connected to the third conduit 31 is excited, and when the valve 60 is opened, the weight of the slide 10 is reduced. The oil on the rod side of the lifting cylinder 9 flows out to the tank 54 while being throttled by the switching valve 60. At this time, the negative pressure is applied to the opposite side of the pulling cylinder 9 from the rod, so that the oil in the tank 54 is supplied through the pipe 59.

Therefore, the slide 10 slowly descends at a speed corresponding to the throttle amount of the switching valve 60.

b) Mold clamping and coining operation When the slide 10 is lowered to a predetermined position, the switching valve 60 is demagnetized, the valve 60 is closed, the 2-port 2-position electromagnetic switching valve 62 is excited, and the valve 62 is opened. First and second pipeline 2
The two-port two-position solenoid-operated directional control valves 33, 35 provided on the 9, 30 are excited to open the valves 33, 35.

At this time, no pilot pressure is applied to the pilot relief valves 55 and 56. As a result, the variable discharge hydraulic pump 26
Is supplied to the main cylinders 7 and 8, and the oil in the lifting cylinder 9 flows out to the tank 54, and the slide 10 further descends.

At this time, since the outflow of oil in the lifting cylinder 9 is controlled by the relief valve 63 via the two-port two-position electromagnetic switching valve 62, the slide 10 is gently moved in response to the outflow of oil from the lifting cylinder 9. Descend.

Then, the slide 10 descends to a predetermined position,
As shown in the figure, the torsion dies 17a and 17b close the mold, clamp the work W (pressing if necessary), and the coining dies 25a and 25b close the mold to form the work W under pressure ( Coining).

c) Twisting operation After the pressurization and mold clamping, the electromagnetic switching valves 33 and 35 and the electromagnetic switching valve 62 are both demagnetized, and these valves 33, 35 and 62 are closed. Therefore, the main cylinders 7 and 8 are hydraulically locked, and the slide 10 is held in the above state. At this time, if the holding pressure of the main cylinders 7 and 8 is not sufficient due to the leak of the pressure oil, a means (not shown) for replenishing the leak oil may be additionally provided.

In this state, when the solenoid a of the 4-port 3-position electromagnetic switching valve 40 provided in the fourth conduit 32 is excited, the hydraulic pump
The pressure oil from 26 is passed through a check valve 41 with a variable throttle to a line 42
The oil on the rod side is supplied to the side opposite to the rod of the press-down cylinder 22, and conversely, the oil on the rod side is throttled by a check valve 43 with a variable throttle through a pipe 44, and while controlling the outflow amount, the electromagnetic switching valve 40 Through the tank 54.

At this time, if the torsion force is smaller than the pressurization and mold clamping force, the hydraulic pressure supplied to the press-down cylinder 22 may be low, so the electromagnetic switching valve connected to the external pilot type relief valve 45 When the valve 47 is excited, the valve 47 is opened and the low pressure relief valve 48 is operated to switch the discharge pressure of the hydraulic pump 26 to a low pressure.

Therefore, the rod protruding operation of the pressing cylinder 22 is performed, and the pressing ram 20 is lowered. Therefore, a roller 19 attached to the tip of the protruding arm 18 is engaged with and held by the press-down ram 20, and the upper retainer is held by the press-down ram 20.
The rotation of the workpiece W in the torsion die 13 is performed by rotating the work 16a by a predetermined angle while being supported by the upper retainer rotation support device 14a and the lower retainer rotation support device 14b integrally with the lower retainer 16b.

d) Lifting operation of the slide After the twisting process, the pilot check valves 55 and 56 are opened by a pilot pressure from a pilot pressure source (not shown), and the solenoid a of the 4-port 3-position electromagnetic switching valve 40 is demagnetized (closed). As a result, the main cylinders 7, 8
The slide 10 is opened to the oil tank 54 via the conduits 57 and 58, so that the slide 10 is released from being pressed by the main cylinders 7 and 8. Further, the lowering of the press-down cylinder 22 also stops.

In this state, when the two-port two-position electromagnetic switching valve 37 is excited and the valve 37 is opened, the pressure oil from the hydraulic pump 26 flows into the rod side of the lifting cylinder 9 via the pipe 31. At this time, the oil on the reaction rod side flows out to the oil tank 54 because the opposite rod side is always open to the tank 54. For this reason, the rod retraction operation of the lifting cylinder 9 is performed, and the slide 10 is raised.

e) Twist return operation After the slide 10 has moved up to a predetermined position, the 2-port 2-position electromagnetic switching valve 37 is demagnetized to close the valve 37, and the solenoid b of the 4-port 3-position electromagnetic switching valve 40 To excite. For this reason, the pressure oil from the hydraulic pump 26 flows into the rod side of the push-down cylinder 22 via the pipe line 44 via the check valve 43 with a variable throttle, and conversely, the pressure oil on the opposite rod side
The oil flows out to the oil tank 54 via a pipe 42 while the flow rate is controlled by a variable throttle provided in the check valve 41 with a variable throttle. Therefore, the rod retracting operation of the pressing cylinder 22 is performed, and the pressing ram 20 is raised. Accordingly, a roller 19 attached to the tip of the protruding arm 18 is engaged with and held by the pressing ram 20, and the upper retainer 16a is supported by the upper retainer rotation support device 14a by raising the pressing ram 20. While rotating to the original position. At this time, the lower retainer 16b is also rotated to the original position by the lower retainer rotation returning device (not shown).

This untwisting may be performed simultaneously with the operation of raising the slide 10.

In addition, the above operation has been described for the case where both torsion and coining are performed at the same time.However, when performing only the twisting step or only the coining step, the switching valves required for each of the above may be individually operated. . At this time, the torsion dies 13 are positioned on the central axes of the main cylinders 7 and 8, respectively.
Is provided so that the torsional center P and the coining center Q of the coining die 23 are positioned, so that the slide 10 can be operated lightly for a long time without an eccentric load.

Further, after the torsion step and the coining step are performed in parallel by the torsion die 13 and the coining die 23 in the same press, the work W in the torsion die 13 is removed by the clamp-type transfer feeder. twenty three
It may be transported inside.

[Effects of the Invention] As described above, according to the present invention, a twisting die and a coining die are provided in the same press, and the twisting process and the coining process are independent from each other by two main cylinders whose centers are located on the axis. As a result, the slide does not generate an eccentric load. In addition, since the work is transferred from the twisting process to the coining process in the same press, the work can be performed at a high speed in conjunction with the press, and the work posture can be easily controlled, and the hydraulic supply source provided for the press can be shared. .

Therefore, it is possible to shorten the cycle time and the changeover time, and also to enable automation, thereby improving productivity and quality safety, improving operability and maintainability, reducing equipment space, and reducing equipment costs. Reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a front sectional view taken along the line A-A of FIG. 2 showing an embodiment of the present invention without a bolster attached, FIG.
The right half is a cross-sectional view taken along the line B-C and the line C-line in FIG. 1, and the left half is D in FIG.
4 is a right side view showing a cross section along the line E-, FIG.
FIG. 5 is an enlarged front view of a main part showing a state of simultaneous execution of a twisting step and a coining step in the same press, FIG. 6 is a perspective view of a retainer part, FIG. The figure is a control circuit diagram of the cylinder. DESCRIPTION OF SYMBOLS 1 ... Crown 2 ... Bed 7 ... Torsion main cylinder 8 ... Coining main cylinder 9 ... Pulling cylinder 10 ... Slide 12a ... Upper bolster 12b ... Lower bolster 13 ... Torsion die 14a ... Upper retainer rotation support device 14b ... Lower retainer rotation Supporting device 15a… Upper fixed die supporting device 15b… Lower fixed die supporting device 16a… Upper retainer 16b… Lower retainer 17a… Upper die 17b… Lower die 18… Protruding arm 19… Roller 20… Press down ram 22… Press down cylinder 23 ... Coining die 24a ... Upper die fixing device 24b ... Lower die fixing device 25a ... Upper die 25b ... Lower die

Claims (1)

(57) [Claims] An upper bolster attached to a vertically movable slide by a main cylinder provided on an upper part of a press frame, and an upper die of a torsion die device and a coining die device are attached to a lower bolster attached to a bed. In a crankshaft torsion forming press in which a lower die of a torsion die device and a lower die of a coining die device are attached, two main cylinders are juxtaposed, and the slide is connected to a ram tip of these main cylinders. Between the slide and the bed, a torsion die device and a coining die device are disposed such that a torsion center and a coining center are located on respective axes of the main cylinder, and a split surface of the torsion die device. A press for torsion forming of a crankshaft, characterized in that a splitting surface of a coining die device has the same height.