JP2544326Y2 - Twister - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twister. More specifically, the present invention relates to a twister used for twist forming of a crankshaft for an engine.

[0002]

2. Description of the Related Art As for a twister, there are the following techniques. The prior art I is described in Japanese Patent Application Laid-Open No. Sho 57-166053, Japanese Utility Model Application Laid-Open No. 57-156249, Japanese Utility Model Application Laid-Open No. 57-156250, etc., and is a general type of twister.
This is, as shown in FIG. 9, a lower retainer for twist forming.
102 is mounted on a fixed type bolster 103, and the piston rod of a hydraulic cylinder 106 mounted on a press bed 105 is connected to a torsion beam 104 so that the torsion beam 104 is driven by a hydraulic cylinder 106 on the front of the bolster 103. I have. Also, the upper retainer 107 for torsion molding is used.
Is connected to a piston rod of a pneumatic cylinder 110 attached to the front and rear of the slide 108 by being held by an adapter plate 109 bolted to the lower surface of the slide 108 so that the pneumatic cylinder 110 can be pulled back. Have been.

As shown in FIGS. 10 and 11, the prior art II has a double structure in which a slide 200 is composed of an inner slide 201 and an outer slide 202, and an upper retainer for holding an upper die is attached to the inner slide 201. The slide 202 operates as a torsion plate and performs torsion forming. 203 is a hydraulic cylinder that raises the inner slide 201, and 204 is a hydraulic cylinder that raises the outer slide 202.

[0004]

By the way, in the conventional example I, the torsion beam 104 is located slightly in front of the bed 105, that is, slightly above the bolster 103, so that the accessibility to the press is poor and the loading and unloading of the work is not easy. There is a major drawback, and there is a problem that it takes time to disassemble and connect the bolt attaching the retainer and the torsion beam at the time of changing the mold. Further, since the rod of the returning pneumatic cylinder 110 is connected to the upper retainer 107, there is a problem that it takes time to disassemble and connect the upper retainer 107 and the cylinder rod at the time of changing the stage. In the conventional example II, there is a problem that the press height is high due to the double structure of the slide, and the maintenance is troublesome because the structure is complicated.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a twister which can easily carry in and out a work, can shorten a mold setup time, and facilitate maintenance and inspection.

[0006]

The twister of the present invention is:
A plurality of upper retainers each including a mold holding portion for holding an upper mold for torsion-molding the material to be formed, an arm extending radially outward from the mold holding portion, and a roller axially attached to the tip of the arm. A lower die for twisting and molding the material to be formed is held together with the upper die by rotatably holding the guides on the lower surface of the slide in a state in which the arms are alternately turned halfway along the torsion axis. A pair of torsion plates respectively disposed before and after or right and left of the slide, in a twister in which a lower retainer comprising a mold holding portion to be rotated is rotatably held by a guide on a bolster upper surface in correspondence with the upper retainer. A pair of torsion cylinders respectively attached to the slide for raising and lowering the torsion plate, and the slide for guiding the raising and lowering of the pair of torsion plates. A pair of gibs detachably attached by a tilt, a working position which is pivotally attached to the lower part of each torsion plate and engages with a roller which is pivotally attached to the arm of the upper retainer, and a retreat position which does not engage with the roller. Rocks between
A torsion return bar whose working position can be fixed by a locking means, an arc-shaped rack formed on the outer periphery of the lower retainer, and a pinion meshed with the rack and rotated by a hydraulic motor installed on a bolster. It is characterized by consisting of.

[0007]

According to the present invention, since the hydraulic motor can be compactly arranged outside the lower retainer, the die space on the upper surface of the bolster can be effectively used, and the loading and unloading of the molded article can be easily performed. In addition, the unscrewing bar moves from the working position to the retracted position by pulling out and rocking the lock pin, so that the engagement with the roller of the upper retainer can be easily released. Can be done. further,
Since the gib is detachable from the slide, the torsion plate can be disassembled simply by removing the gib without removing the slide from the press, and maintenance such as interval adjustment can be easily performed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a main part of a twister according to an embodiment of the present invention, FIG. 2 is a partially cutaway side view of the twister of FIG. 1, FIG. 3 is an enlarged view of the line III in FIG. 2, and FIG. FIG. 4 is an enlarged view of the IV line of FIG. 1 and 2, 1 is a bed, 2 is a crown, and 3 is four columns connecting the bed 1 and the crown 2.

A main cylinder 4 is fixed to the crown 2, and a slide 5 is fixed to a rod of the main cylinder 4. As shown in FIG. 3, the slide 5 has a pair of front and rear slide shoes 5a on each side, a total of four slide shoes 5a.
And slides on the wall surfaces of the four columns 3 and moves up and down by the expansion and contraction operation of the main cylinder 4. Before and after the slide 5, as shown in FIGS.
Torsion plates 6 and 7 are arranged, respectively, and torsion cylinders 8 and 9 connected to the torsion plates 6 and 7 are mounted on the upper surface of the slide 5. 1 and 3
As shown in the figure, the front give 11 is bolted to the front of the slide 5.
A rear gib 13 is attached to the rear surface of the slide 5 by bolts 14 so as to be detachable. The front and rear torsion plates 6, 7 are guided by the front and rear gibbs 11, 13 and move up and down by the expansion and contraction of the torsion cylinders 8, 9.

[0010] As shown in FIGS.
At the lower part of 7, the untwisting bars 16, 17 are swingably mounted. 5 (A) is an enlarged side view around the untwist bar 16, and FIG. 5 (B) is an enlarged front view. Connecting portion 16 rising from both ends of torsion return bar 16
a is pivotally mounted on brackets 6a at both lower ends of the torsion plate 6 with fulcrum pins 21. The connecting portion 16a and the bracket 6a
Are provided with pin holes 23, 24 for inserting lock pins 22, respectively. 5A, when the lock pin 22 is inserted into the pin holes 23 and 24 with the torsion bar 16 directed downward, the torsion bar 16 is set to the working position, and the arm 32 of the upper retainer 30 is moved to the working position. This is the position where the leading end roller 33 is engaged. Then, when the lock pin 22 is removed and the untwist bar 16 is swung to the retracted position shown by the solid line, the roller 33
Can be disengaged. This structure is the same for the rear torsion bar 17. The lock pin 22 and the pin holes 23 and 24 correspond to the lock means in the claims of the utility model registration. However, besides the above, the torsion bars 16 and 17 can be arbitrarily fixed between the working position and the retracted position. -Any mechanism may be used as long as it can be released.

As shown in FIG. 2, a guide 25 is attached to the lower surface of the slide 5, and an upper retainer is attached to the guide 25.
30 is rotatably held. The upper retainer 30 is a known mechanism, and includes a mold holding portion 31 for holding an upper mold for torsion-molding a material to be molded, an arm 32 extending radially outward from the mold holding portion 31, and a tip of the arm 32. And a roller 33 axially mounted on the roller. This upper retainer 30 is shown in FIG.
As shown in FIG. 2, a plurality of arms (the number is determined by the type of the crankshaft to be molded) are arranged along the torsional axis, and the arms 32 are alternately oriented in opposite directions.

As shown in FIGS. 1 and 2, a bolster 10 is installed on the upper surface of the bed 1, and a guide 26 is mounted on the upper surface, and a lower retainer 40 is rotatably held on the guide 26. As shown in FIG. 6, the lower retainer 40 is provided with a mold holding portion 41, which holds a lower mold for twist-molding a molding material together with the upper mold. An arc-shaped rack 42 is attached to the arc-shaped outer peripheral surface of the lower retainer 40. The rack 42 is engaged with a pinion 43. As shown in FIGS. 1 and 4, two hydraulic motors 45 are installed on the upper surface of the bolster 10, and two rotating shafts 46 that are rotated by each hydraulic motor 45.
Are respectively supported by brackets 47, and the pinion 43 is attached to the rotating shaft 46. Accordingly, by rotating the hydraulic motor 45, the lower retainer 40 can be rotated in the directions of arrows a and b as shown in FIG.

Next, the twist forming operation of the above twister will be described with reference to FIGS. FIG. 7A shows a step of carrying in the material X to be molded, in which the slider 5 and the front and rear torsion plates 6 and 7 are raised.
Therefore, the upper retainer 30 is also separated upward from the lower retainer 40. In this embodiment, when the material to be formed is carried in, in this embodiment, since there is no large component such as the untwist cylinder around the bolster 10, the workability is good and the work is easy. FIG. 7B shows a state in which the main cylinder 4 is extended and the slide 5 is moved.
Is lowered, the upper retainer 30 and the lower retainer 40 are combined, and the blank X is clamped. FIG. 7C shows a process in which the torsion cylinders 8, 9 are extended, the torsion plates 6, 7 are pushed down, and the upper and lower retainers 30, 40 are rotated to perform torsion forming.

FIG. 8D shows a state in which the main cylinder 4 is contracted, the slide 5 is raised, and the upper retainer 30 is raised. FIG. 8E shows a state in which the torsion cylinders 8 and 9 are further contracted to raise the torsion plates 6 and 7. At this time,
Rollers 33 of all upper retainers 30 are front and rear untwist bars.
The upper retainer 30 is untwisted because it is engaged with 16, 17. FIG. 8F shows a state in which the pinion 43 is rotated by the hydraulic motor 45 and the lower retainer 40 is untwisted. Here, the molded product is taken out. Thus, a series of molding operations is completed.

The present embodiment is configured as described above, and has the following advantages. Since the hydraulic motor 45 can be compactly arranged outside the lower retainer 40, the die space on the upper surface of the bolster 10 can be effectively used, and the loading and unloading of the molded object can be easily performed. The torsion return bars 16 and 17 move from the working position to the retracted position by pulling out and rocking the lock pin 22.
The engagement of the roller 30 with the roller 33 can be easily released, and the time and labor are not required, so that the mold setup can be easily changed. The front gib 11 and the rear gib 13 are detachably attached to the slide 5 with bolts 12 and 14, so that the slide 5
The torsion plates 6 and 7 can be dismantled simply by removing the front and rear gibs 11 and 13 without removing the
Maintenance such as gap adjustment can be easily performed.

Next, another embodiment of the present invention will be described. In the above embodiment, the pair of torsion plates 6 and 7 slide 5
Although this is an example in which the slide 5 is arranged before and after, it may be arranged on the left and right of the slide 5. Although the lock pin 22 in the above embodiment fixes the working position of the torsion return bars 16 and 17, the retracted position can also be fixed with the same lock pin 22 with another pin hole or retracted with an appropriate stopper. The position may be temporarily fixed. In the above-described embodiment, two hydraulic motors 45 are used. However, one hydraulic motor may be used to drive two rotating shafts 46, and a small hydraulic motor may be individually provided for all the pinions 43. You may make it connect directly.

[0017]

According to the present invention, it is possible to provide a twister in which the time required for changing the mold setup can be shortened and maintenance and inspection can be facilitated.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a twister according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view of the twister of FIG.

FIG. 3 is an enlarged view taken on line III of FIG. 1;

FIG. 4 is an enlarged view taken along the line IV in FIG. 1 in a state where the upper retainer 30 is placed on the lower retainer 40;

FIG. 5 is an enlarged side view (A) and an enlarged front view (B) of the area around the torsion bar 16;

FIG. 6 is an enlarged front view around the lower retainer 40.

FIG. 7 is a process chart (A), (B), (C) according to the present embodiment.

FIG. 8 is process diagrams (D), (E), and (F) according to the present embodiment.

FIG. 9 is a front view of a twister of Conventional Example I.

FIG. 10 is a front view of a main part of a twister of Conventional Example II.

FIG. 11 is a sectional view taken along line XI of FIG. 10;

[Explanation of symbols]

4 Main cylinder 5 Slide 6
Torsion plate 7 Torsion plate 8 Torsion cylinder 9
Torsion cylinder 10 Bolster 11 Front give 12
Bolt 13 Giving after 14 Bolt 16
Untwist bar 17 Untwist bar 22 Lock pin 30
Upper retainer 31 Mold holder 32 Arm 33
Roller 40 Lower retainer 41 Mold holding part 42
Rack 43 Pinion 45 Hydraulic motor 46
Axis of rotation

Claims (1)

(57) [Scope of request for utility model registration] 1. A mold holding portion for holding an upper mold for torsion-molding a material to be formed, an arm extending radially outward from the mold holding portion, and a roller axially attached to a tip of the arm. A plurality of upper retainers are rotatably held by guides on the lower surface of the slide with a plurality of upper retainers along the torsion axis, and the arms are alternately turned in opposite directions. In a twister in which a lower retainer comprising a mold holding portion for holding a mold is rotatably held by a guide on a bolster upper surface in correspondence with the upper retainer, a pair of torsion plates respectively arranged before and after the slide or right and left of the slide A pair of torsion cylinders respectively attached to the slide for raising and lowering the pair of torsion plates; and a guide for raising and lowering the pair of torsion plates. A pair of gibs detachably attached to the slide with bolts, and a working position which is pivotally attached to the lower part of each torsion plate and engages with a roller which is pivotally attached to the arm of the upper retainer, and does not engage with the roller. A torsion bar that swings between the retracted position and the working position can be fixed by a locking means, an arc-shaped rack formed on the outer periphery of the lower retainer, meshed with the rack, and installed on a bolster. And a pinion rotated by a hydraulic motor.