JP2756539B2 - Closed forging equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forming apparatus for closed forging, and more particularly to a vertically divided side useful for forming a complex-shaped product having a plurality of concave portions or the like on a side portion. The present invention relates to a forming device for closed forging having a square forming die and upper and lower forming punches and attached to a general forging press.

(Prior art) Closed forging of parts with complicated shapes such as parts with undercuts at multiple locations on the side and hollow parts with double flanges is performed in addition to the upper and lower forming dies (upper and lower forming punches). Means for pressurizing or regulating the side are required. Conventionally,
A plurality of hydraulic rams are provided on the side of the molded product as a means for laterally pressing and regulating the molded product, and the plurality of horizontal pressure rams are used to form the molded product together with the upper and lower forming punches. In order to make it possible to take out the molded product, a plurality of vertically divided molds 2 are arranged on the side of the molded product 1 as shown in FIG. Each split mold is held by a horizontal movable holder 3 having a tapered surface on the outer periphery, and the split mold 2 is clamped by wedge action under the pressure of an upper ram 4 which engages with the tapered surface of the holder 3, and the upper and lower moldings are performed. A structure in which the molding is performed by the punches 5 and 6 (for example, JP-A-58-41643), or a tapered recess in the split mold holder 7 as shown in FIGS. 6 (a) and 6 (b). 7 'is formed and a split mold 8 also having a tapered outer portion is placed in the recess 7' of the holder 7. There is known a structure in which the workpiece 1 is housed, the molded article 1 is molded by pressing down an upper die, and after molding, the split mold 8 is pushed upward by an ejector pin 9 and expanded as shown in FIG. .

(Problems to be Solved by the Invention) In the above-described conventional closed forging apparatus using a horizontal pressure ram, it is necessary to design and manufacture the entire press, and the apparatus is effective, and the cost of the product is increased. Come. The above-mentioned Japanese Patent Application Laid-Open No. 58-41643 requires a reciprocating press for operating an upper forming punch and a tapered upper ram. In addition, the structure for accommodating the split mold in the split mold holder shown in FIGS. 6 (a) and 6 (b) requires a device for supporting the split mold when the split mold 8 is pushed up after completion of molding, and the entire apparatus is complicated. And the scale and the like at the time of molding fall into the concave portion 10 of the split mold 8 and the holder 7.
It is necessary to take measures to remove it, and there is also a problem in durability.

(Means for Solving the Problems) Therefore, the present invention can be easily attached to an ordinary forging press and used, and the mold clamping and releasing operations of the split mold can be performed by a sliding operation of the press via a toggle link mechanism. It is possible to provide a closed forging forming apparatus capable of arbitrarily setting the mold closing operation timing of each split mold, and specifically, an upper forming punch connected to the press slide side of the forging press, A lower forming punch held on the press bed side, a plurality of vertical split dies arranged horizontally movably beside the lower forming punch, and a toggle link mechanism connected to the side of the vertical split die And a toggle provided between the upper part of the toggle link mechanism and the press slide via a cylinder device to extend the toggle link in accordance with the pressing-down operation of the press slide. And a glue link operation piston.

(Examples) Next, the present invention will be described with reference to the drawings with respect to examples.

FIG. 1 is a longitudinal sectional view of a forming apparatus for closed forging according to an embodiment of the present invention, and FIG. 2 is a plan sectional view of a lower die holder of the embodiment of the present invention, specifically, A- in FIG. It is sectional drawing along the A line. FIG. 1 is a cross-sectional view taken along a diagonal line passing through the center of the molding apparatus, specifically, BB of FIG.
It is a vertical cross-sectional view on a vertical plane along the line, the left half is a state where the press slide has descended to approximately the bottom dead center and the upper forming punch has entered a split mold described later, the right half is a press This shows a state in which the upper forming punch comes out of the split mold upward due to the rise of the slide. Press slide of forging press machine
An upper die holder 12 is mounted on 10, and a lower die holder 13 is mounted on the press head 11 correspondingly. Reference numeral 14 denotes guide posts provided at three end portions of the lower die holder 13 for guiding the vertical movement of the upper die holder 12.

A main piston 15 is fitted in the center of the upper die holder 12, and an upper forming punch 16 is fixed to a lower end thereof. A main piston cylinder chamber 18 is formed between the upper end of the main piston 15, a cylinder end plate 17 fixed to the lower surface of the press slide 10, and the upper formed punch insertion hole of the upper die holder 12, and is not shown in the cylinder chamber 18. Pressure oil is supplied from a punch load control accumulator. Toggle link actuating pistons 19 are inserted into the upper die holder 12 at the same distance from the center of the main piston 15 and at three predetermined positions on a line divided into three parts in plan view. A cylinder end plate fixed to the upper end of the toggle link operating piston 19 and the lower surface of the press slide
A piston cylinder chamber 21 for toggle link operation is formed between the piston fitting hole 20 and the upper die holder 12, and pressure oil is supplied to the cylinder chamber 21 from a buffer accumulator (not shown).

Next, a lower forming punch 22 is held at the center of the lower die holder 13, a known ejector pin 23 is inserted into the center of the lower forming punch 22, and the ejector pin 23 is driven by a driving device (not shown) through a knockout pin 24. Protrudes into the molding cavity above the lower molding punch, and discharges the molded article 1. In the illustrated embodiment, the molded product 1 has a triangular cross-sectional shape as a whole, and the shapes of the upper and lower forming punches 16 and 22 have a triangular cross-sectional shape correspondingly.
On the side of the lower forming punch 22, as shown most clearly in FIG.
It is fixed to the split type holder 26 on the upper part 13. Split type holder
A pair of guides 26 has a slide key 27 attached to the lower surface thereof, and this key portion is fixed to the lower die holder 13, as shown in FIG. Each split mold holder 26 is guided by the plate 28 and moves horizontally in the direction facing the lower die holder 13. As shown in FIG. 2, each split mold 25 has an adjacent split face 25a.
Are clamped at the positions where they contact each other, and the molded product 1 is taken out by moving away from this state to the side. This operation will be further described later.

A side link that can move up and down and is slightly movable in the diagonal direction of the lower die holder 13 is located further outside of each split mold holder 26 and below the toggle link operating piston 19.
30 are located. As shown in FIGS. 4 (a) and 4 (b), a center pin 31 of a toggle link mechanism is pivotally supported on the side link 30, and a pair of side pins 32 are disposed diagonally across the center pin 31. , 33 are pivotally supported by the split die holder 26 and the lower die holder 13, respectively. As shown in FIG. 1, arc-shaped concave portions each having an arc angle exceeding 180 ° are formed in the outer portion of the split mold holder 26 and the stepped wall portion of the lower die holder 13, and the side pins 32, 33 is inserted horizontally from its axial direction, which allows each side pin 3
2,33 are pivotally supported in the radial direction so that they cannot be separated. The center pin 31 and the side pins 32, 33 are connected by toggle links 34, 35. When a force is applied to the side link 30 in the vertical direction, the center pin 31 of the side link 30 is centered on one side pin 33 pivotally supported by the lower die holder 13 together with the side link via the toggle link 34, 35. Accordingly, the side pin 32 which is pivotally supported by the split mold 25 via the other (inner) toggle link 34 in the range of the sliding amount S in FIG. To move horizontally, whereby the split mold 25 is opened and closed. Specifically, mold clamping by the split mold 25 is performed when the side link 30 descends and the two toggle links 34, 35 become substantially horizontal,
By raising the side link 30 from this position, the split mold 25 is opened. Split type below the side link 30
A drive mechanism for opening 25, that is, a mold opening device 37 is provided. This mold release device 37 is used for the side link 30
, And a known ejector pin 38 inserted into the lower die holder 13 below, and an ejector pin push-up pin located below the ejector pin 38 and inserted into the press bed 11. To open the split mold 25, use a drive device (not shown) to push up the ejector pin.
39 is raised, and the ejector pin 38 is raised via the push-up pin 39. When the ejector pins 38 rise, the side links 30 are pushed up to open the split mold 25.

In the above-described configuration, if the closed forging operation is described in the order of operation, first, the press slide 10 of the press machine descends. Thereby, before the operation, the tip of the toggle link operating piston 19 at the lowermost position is brought into contact with the upper end of the side link 30 by the buffer accumulator. When it is desired to make the start and completion timings of the mold clamping different for the three split molds, the lengths of the three toggle link actuating pistons 19 are changed, and the pistons are changed.
The contact timing between 19 and the side link 30 is shifted. Next, the toggle link operating piston 19 presses the side link 30 downward while projecting until the pressure of the buffer accumulator is reached. The split mold holder 26 advances toward the center by the above-described toggle link mechanism, and starts mold clamping. At this time, it is also possible to form the molded product 1 from the lateral direction by the split mold 25. The forward movement of the split mold holder 26 stops depending on whether the lower end of the side link 30 contacts the stopper fitting 41 or whether the split surfaces 25a of the split mold 25 contact each other. Thereafter, the press slide 10 further descends, but since the toggle link actuating piston 19 is stopped immediately, the pressure oil in the toggle link actuating piston cylinder chamber 21 is sent to the buffer accumulator. After the mold clamping is completed in this way, the upper forming punch 16 is inserted into the split mold 25, and the molded product 11 is compressed from above and below, and the slide 10 of the press machine reaches the bottom dead center to complete the closing molding. I do. In this case, if the punch load is higher than the set value before the press slide 10 reaches the bottom dead center, the pressure oil in the main piston cylinder chamber 18 is sent to the punch load control accumulator, thereby keeping the punch load constant. Dripping. Thereafter, as the press slide 10 is raised, the upper forming punch 16
Rises, and after the oil in the buffer accumulator is sent to the piston cylinder chamber 21 for toggle link operation, the piston 19 for toggle link operation also rises. The ejector pin 38 of the mold opening device 37 is raised by a drive device (not shown) to open the split mold 25.

(Effects of the Invention) As described above, according to the present invention, a normal forging press is provided by providing a toggle link mechanism in the lower die holder corresponding to each of the split dies and providing the upper die holder with a toggle link operating piston. A vertical split mold clamping can be performed while being mounted on a press and utilizing the pressing force of the press as it is. The pushing of the upper forming punch can be performed after the mold clamping is completely completed, and the operation timing of the toggle link mechanism, that is, the start and completion timing of the mold clamping can be arbitrarily and easily selected for each split mold. There is.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a forming apparatus for closed forging according to an embodiment of the present invention, FIG. 2 is a plan sectional view of a lower die holder in the embodiment of FIG. 1, and FIG. 3 is CC in FIG. FIG. 4 (a) is a cross-sectional view taken along the line DD of FIG. 1, FIG. 4 (b) is a front view as viewed from an arrow F in FIG. 4 (a), and FIG. Fig. 6 (a) is a longitudinal sectional view of a conventional closed forging device.
(B) is a longitudinal sectional view of the split mold clamping mechanism. 10 ... press slide, 11 ... press bed, 12 ... upper die holder, 13 ... lower die holder, 16 ... upper forming punch, 19 ... ... toggle link actuating piston, 21 ... ... toggle link actuating piston cylinder chamber , 22… Lower forming punch, 25… Split mold, 26… Split mold holder, 30… Side link, 34, 35… Toggle link, 37… Leaving the mold open, 38… Ejector pin.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Ryoji Soga 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Inside Honda Engineering Co., Ltd. (72) Inventor Hisayuki Sakurai 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture (56) References JP-A-1-233035 (JP, A) JP-A-1-104436 (JP, A) JP-A-62-84847 (JP, A)

Claims (1)

(57) [Claims] An upper forming punch connected to a press slide side of a forging press, a lower forming punch held on a press bed side, and a plurality of horizontally arranged movable sideways of the lower forming punch. A vertical split type, a toggle link mechanism connected to the side of the vertical split type, and a pressing device provided between the upper part of the toggle link mechanism and the press slide via a cylinder device to reduce the press slide operation. And a toggle link operating piston for causing the toggle link to extend in response thereto.