JP2594977B2 - Universal mold and hot forming method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a universal mold and a hot forming method, and more particularly, to a universal mold used for molding a blade having a three-dimensional curved surface, And a hot forming method.

[Conventional technology]

Conventionally, a mold for forming a three-dimensional curved surface is disclosed in
No., Japanese Unexamined Patent Publication No. Sho 62-77128, in order to obtain a predetermined curved surface, plates arranged in a grid pattern are combined vertically and horizontally, and the combined plate is processed into a predetermined curved surface. There are molds in which the space between the vertical and horizontal sides is filled with a filler, or a core (block) processed to have a predetermined curved surface is joined with a spacer instead of a plate. One mold must be manufactured for a curved surface, and there is no flexibility for the other curved surface of the mold.

Also, there are JP-A-59-153527 and JP-A-61-245924 as those aiming at a certain degree of flexibility, but the method of simultaneously adjusting several by motor drive has a space limitation, It is difficult to adjust one punch at a time, and there is also a limitation on the strength of the punch. Furthermore, we make groove in punch (post)
There is a case in which a plate is inserted into this groove and the plate is combined with an azist to achieve flexibility. However, it takes time to assemble, and it is difficult to form a large wall when considering the problem of strength.

As described above, the conventional method has a problem that it is difficult to form a large-sized and thick-walled flexible mold, and the one-curved surface integral type requires a huge mold cost.

[Problems to be solved by the invention]

According to the above-mentioned conventional technology, in a mold mainly used for hot forming of a runner vane such as a pump-turbine having a three-dimensional curved surface having a complicated shape, when there are various curved surfaces, a mold capable of quickly responding to the curved surface is used. The mold is almost impossible, the cost of the mold is enormous, and there is a problem in the strength of the mold during hot working of thick steel plates.

An object of the present invention is to provide a universal forming die and a hot forming method capable of forming a runner vane having a curved surface shape, such as a pump turbine, in a short time and with high accuracy.

[Means for solving the problem]

The above-mentioned object is to use a universal molding die used for producing a blade having a three-dimensional shape by hot molding, an upper die,
And the lower mold frame, the upper mold, and a plurality of upper molds and lower mold punches housed inside the lower mold frame, the upper mold, and the lower and upper molds of each of the lower mold punches, and The upper die and the lower die are provided between the lower die frame, and the upper die and the lower die have different heights to cover the adjustment amount of the lower die.The lower die has a spacer for the punch. A T-shaped protrusion is formed on the upper frame side, and the T-shaped protrusion is inserted into a T-shaped groove formed in a block fixed to the upper frame, and both are fitted and supported. And the upper mold,
The lower punch and the lower punch are configured such that each punch ball head is fixed to a slide cylinder and that the position of the lower punch can be adjusted in the vertical direction by a square screw fixed to a guide cylinder that guides the slide cylinder. When hot-forming a blade having a three-dimensional shape using a universal mold, the forming of the three-dimensional curved surface,
Adjust the upper die and the lower die punch by aligning a plurality of upper dies and lower die punches arranged in a row of points inside the upper die and the lower die frame with the coordinates of each point row corresponding to the three-dimensional curved surface. After forming a curved surface, at the time of the first forming, sandwich a dummy plate in the form of sandwiching a thick steel plate to be bent to an arbitrary surface up and down, heat bending to an arbitrary curved surface, and then cool Later, this dummy plate was replaced with the upper mold,
And the second and subsequent times are achieved by a hot forming method in which a steel plate to be bent is sandwiched and formed between the dummy plates formed on the arbitrary curved surface. Is done.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to FIGS. 1 to 6. FIG. 1 is a cross-sectional view of a universal forming die of the present invention, in which a thick steel plate to be formed into a three-dimensional curved surface is formed by sandwiching a dummy plate in the middle. Fig. 2 shows the universal type II-I of Fig. 1.
FIG. 2 is a plan view as viewed in the direction of the arrow I, and is a part of a plan view in which punches arranged in a point array are indicated by black circles. FIG. 3 shows a part of a side view of the universal mold shown in FIG. 1 as viewed from the direction of arrow II. FIG. 4 shows a state in which a dummy plate is fixed to a universal mold and a thick steel plate is set inside the universal mold, and shows a state before the three-dimensional curved surface forming of the thick steel sheet is started. FIG. 5 shows an overall view of a vane having a three-dimensional curved surface which is a contrast of the present invention, mainly a pump turbine and the like, and FIG. 6 shows a runner vane of the pump turbine and the like.

In the universal type configuration, an upper die 3 and a lower punch 4 for forming a three-dimensional curved surface are housed inside the upper die frame 1 and the lower die frame 2. In the lower part of the lower punch 4 and the upper punch 3, an upper punch spacer 5 and a lower punch spacer 6 for covering the amount of adjustment of the punch are fixed to the punch in several different shapes with different heights. And fixed to the upper frame 1 and the lower frame 2 respectively. In order to prevent the upper punch spacer 5 from dropping due to its own weight, the T-shaped protrusion of the upper punch spacer 5 is inserted into a T-shaped groove in a block 7 fixed to the upper frame 1 and pulled. It is hooked so that it does not fall. The upper frame 1 and the lower frame 2
An upper guide plate 8 and a lower guide plate 9 having three-dimensionally curved cutouts are fixed in four directions, respectively.

A description will be given of a method and an operation of the universal type used for forming the three-dimensionally curved blades, mainly the runner vanes 11 of the pump turbine 10, by using the universal type configured as described above. First, the upper punch 3 and the lower punch 4 arranged in each point sequence are combined by the numerical value of each point sequence coordinate. The upper punch spacer 5 and the lower punch spacer 6 are selected and fixed to the upper punch 3 and the lower punch 4, respectively. The set upper punch 3 and lower punch 4 are arranged and arranged in the upper frame 1 and the lower frame 2 respectively. Only the upper punch 3 is inserted into the T-shaped groove of the block 7 by the upper punch spacer 5. Insert the T-shaped protrusion of 90 °
Rotate so that it does not fall, but the lower punch 4
It is inserted and installed in the lower frame 2 as it is. The upper punch 3 and the lower punch 4 are punch heads according to the numerical values of the point sequence coordinates.
Although the bearing 12 is agitated by a predetermined coordinate value, the punch ball head 12 is fixed to the slide cylinder 13.
The slide cylinder 13 is a guide cylinder 14 for guiding the slide cylinder 13.
The coordinate position can be finely fixed by means of a square screw 15 fixedly mounted on the base. By turning the handle 16 provided on the punch ball head 12, the square screw 15 can set the coordinate position of the ball head 12 together with the slide cylinder 13. After the coordinate positions of the punches arranged in a row are determined in this manner, the runner vanes 11 sandwiched by the dummy plates 17 are set on a hydraulic press, and molding is performed by applying molding force as indicated by arrows. After the second molding process, the dummy plate 17 is fixed to the upper guide plate 8 and the lower guide plate 9 by welding or the like.
As shown in the figure, a thick steel plate 18 to be the second or later run vane is inserted between the three-dimensionally curved dummy plates 17 and formed by a predetermined forming pressure.

In order to enable various three-dimensional curved surface forming, the punches 3 and 4 are adjusted by appropriate coordinate setting, and the dummy plate 17 and the thick steel plate 18 are bent together at the first forming, and thereafter, Then, the dummy plate 17 is fixedly welded to the guide plates 8 and 9 of the press frame to form a universal type for processing a three-dimensionally curved blade.

FIGS. 5 and 6 show the runner vanes 11 of the pump turbine 10 and the like formed in this manner. Here, since the runner vane is large, it is divided into three parts as shown in FIG. 6 and welded after forming.

 According to this embodiment, the following effects can be obtained.

(1) vanes having various three-dimensional shapes with various curved surface shapes,
Mainly, in a runner vane processing of a pump turbine, etc., one mold can cope with various curved surface shapes without forming molding molds having different curved surface shapes.

(2) By using a square screw screw to adjust the punch head, it is possible to perform highly accurate machining with a simple mechanism.

(3) Since the processing steps can be shortened and the material cost can be reduced to a steel plate from the integral casting, the cost can be significantly reduced, which can contribute to a total cost reduction.

〔The invention's effect〕

According to the universal molding die and hot forming method of the present invention described above, a runner vane such as a pump turbine having a curved surface shape can be formed in a short time and with high accuracy.

[Brief description of the drawings]

1 is a cross-sectional view of a universal molding die according to one embodiment of the present invention, FIG. 2 is a plan view taken along the line II-II of FIG. 1, FIG. FIG. 4 is a view showing a state in which a thick steel plate formed by a universal die is set, FIG. 5 is an overall view of a pump turbine as a control of one embodiment of the present invention, and FIG. It is a perspective view of a runner vane. 1 ... upper frame, 2 ... lower frame, 3 ... upper punch, 4 ... lower punch.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masakazu Midorikawa 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Hitachi, Ltd. Hitachi Plant (72) Inventor Satoshi Furuzawa 3-1-1, Sachimachi, Hitachi-shi, Ibaraki No. 1 Inside Hitachi, Ltd. Hitachi Works (56) References JP-A-54-103771 (JP, A) JP-A-60-191621 (JP, A)

Claims (2)

(57) [Claims] 1. A universal molding die used for producing a blade having a three-dimensional shape by hot molding, wherein the universal molding die includes an upper mold and a lower mold frame, and the upper mold and the lower mold. A plurality of upper dies and lower punches housed inside the frame, and the upper and lower punches are respectively installed between the lower and upper dies, and the lower dies frame, and the upper dies, And an upper die and a lower punch spacer having different heights to cover the adjustment amount of the lower die punch. The upper die spacer has a T-shaped projection formed on the upper die frame side. , The T
The U-shaped protrusion is inserted into a T-shaped groove formed in a block fixed to the upper mold frame so that both are fitted and supported, and the upper mold and the lower mold punch are A universal molding die, wherein a punch ball head is fixed to a slide cylinder and the position is vertically adjustable by a square screw fixed to a guide cylinder for guiding the slide cylinder. . 2. When a blade having a three-dimensional shape is subjected to hot forming using a universal forming die, the forming of the three-dimensional curved surface is performed by a plurality of spots arranged in a row inside an upper die frame and a lower die frame. The upper mold and the lower mold punch are adjusted to the coordinates of each point sequence corresponding to the three-dimensional curved surface, and the upper mold and the lower mold punch are adjusted to form a curved surface. Insert a dummy plate in the form of sandwiching the thick steel plate to be bent up and down, heat and bend it to an arbitrary curved surface, and then, after cooling, weld this dummy plate to the upper mold and lower mold frames And a second and subsequent steps, wherein a steel plate to be bent is sandwiched and formed between the dummy plates formed on the arbitrary curved surface to perform a forming process.