JPS6238050B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a hydraulic casting device for forming ring-shaped protrusions, other marks, characters, figures, etc. on chemical cosmetics tools, light electrical equipment, tone-related parts, etc. It is.

Conventionally, in this type of shaping, for example, when shaping a convex part in a pipe-like shape to a pipe-like container, an upper part is inserted into the pipe-like container 8 inserted into the recess of a mold 7, as shown in FIG. A jig 9 having a conical part is inserted, and an elastic body 10 such as rubber is placed on the conical surface, and a value having a conical surface opposite to the conical surface is placed above the jig 9. By placing the jigs 11 facing each other and applying pressure to the jigs 11 from above, a rough portion is formed based on deformation and pressure of the rubber, etc., and furthermore, in order to accurately correct this protrusion, Rolls or other jigs were used, and the protrusions were also separated and corrected on each side. In such cases, the number of steps involved is multi-step, productivity is extremely low, and defects such as breakage of the shaft of the jig often occur during straightening.

In addition, a hollow workpiece is inserted into a press mold, the workpiece is filled with liquid and then closed, a processing needle is pushed into the mold, and as a result, the pressurized liquid presses the workpiece. A bulge processing device for bulging and press working is disclosed in Japanese Patent Application Laid-Open No. 1983-45546, but the technique for operating this bulge processing device accurately and efficiently has not been disclosed at all. It has not been.

Therefore, in view of these conventional deficiencies, the present invention was proposed in an attempt to solve the problems.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. Reference numeral 1 denotes a mold, which is divided into a lower mold and an upper mold, the upper and lower molds forming a pair, and is provided with a recess 3 into which the workpiece 2 can be tightly fitted and inserted. Reference numeral 4 denotes a recess provided in the recess 3 of the mold 1, and this recess 4 corresponds to a convex portion or graphic character mark formed on the side surface of the workpiece. Then, the processed product 2 is inserted into the recess 3 of the mold 1 and tightly fitted, and the liquid 5 is inserted. The liquid 5 is oil or hydrogen, but is not limited thereto. Furthermore,
Seal plunger 1 via Danki rubber 12
Place the center part 14 of 3 on the upper surface of the workpiece 2,
By pressurizing the liquid in the workpiece 2,
Convex portions and the like corresponding to the concave portions 4 formed in the mold 1 are formed on the workpiece. This is the so-called bulge device. Accordingly, in the embodiment of the present invention, in such a bulge device, a shaft 17 is provided on the upper surface of the end of the seal plunger 13 that closes the upper surface opening of the mold 1.
17... is provided protrudingly, and these shafts 17, 17...
The upper part of the press ram 15 is loosely inserted into shaft insertion holes 15a, 15a, . . . formed in the press ram 15 located in the upper part. The shaft has springs 18, 18...
When the press ram 15 descends after winding the
The seal plunger 13 closes the upper surface of the mold 1,
The press ram 15 and the seal plunger 1 are pressed until the center portion 14 is placed on the upper surface of the workpiece 2.
3 are lowered at the same speed. A machining needle 6 is loosely fitted into the center of the seal plunger 13, and the upper part of the machining needle 6 projects above the seal plunger 13, and the head is formed on the flange 6a, and furthermore, the flange 6a and the seal plunger 1 are connected to each other.
An elastic spring 18 is wound between 3 and 3. Furthermore, a punch 16 is provided protruding from the center of the lower surface of the press ram 15, and the flange 6a of the processing needle 6 can be pressed by the punch 16.

Since this embodiment relates to the device described above, it is possible that a convex portion or the like is formed on the workpiece 2 in a portion corresponding to the recess 4 formed in the mold 1 due to an increase in the hydraulic pressure within the workpiece 2. is the same as a conventional bulge processing device, but when performing this part processing, it is natural that the workpiece 2 inserted into the mold 1 is filled with liquid 5, but first the press ram is 15 is coming down. At this time, the seal plunger 13
The press ram 1 is moved by springs 18, 18... wound around shafts 17, 17... protruding from the upper surface.
5, the seal plunger 13 similarly descends and comes into contact with the upper surface of the mold 1, and the center portion 14 of the seal plunger 13 is placed on the upper surface of the workpiece 2, and the liquid 5 It is sealed.
After that, the press ram 15 descends and strikes the upper surface of the flange 6a of the head of the processing needle 6. In such a case, the lower part of the processing needle 6 pushes into the liquid 5 against the elastic spring 18. At this time, the liquid 5 rapidly becomes high in pressure and rapidly pressurizes the inner wall surface of the workpiece 2. Therefore, the wall surface of the workpiece 2 escapes into the recess 4 formed in the recess 3 of the mold 1 and other carved parts, which have the least resistance. This allows bulge processing to be carried out effectively and reliably. Once pressed by the hammer action, it is restored by the spring action of the springs 18, 18, . . . . Furthermore, it is natural that the portion that cannot withstand the hydraulic pressure escapes to the outside from the rubber seal 12, which is the sealing surface.

As will be explained in detail in the embodiments described, this invention allows forging to be performed instantaneously by hammer action, and the processing is extremely accurate, requiring no correction, and bulge processing can be performed reliably and quickly. It is possible to eliminate all the deficiencies of the conventional method.

[Brief explanation of the drawing]

Figure 1 is an explanatory longitudinal sectional view showing the conventional device, Figure 2
4 through 4 are longitudinal cross-sectional views of this device, and show the processing order thereof. Code explanation, 1, 7...mold, 2...workpiece,
3, 4... Concavity, 5... Liquid, 6... Processing needle, 8... Pipe container, 6a... Flange, 9, 1
DESCRIPTION OF SYMBOLS 1... Jig, 10... Elastic body, 12... Danki rubber, 13... Seal plunger, 14... Center part of seal plunger, 14a... Hole, 15
...Press ram, 15a...Shaft insertion hole, 16...
Punch, 17... shaft, 18... spring.

Claims (1)

[Claims] 1 A hollow workpiece 2 fitted into a recess 3 of a mold 1 having an open end is filled with liquid 5 to close the open end, and a processing needle 6 is pushed into the recess to increase the pressure of the above-mentioned In a hydraulic processing device configured to perform plastic working by expanding a workpiece 2 with a liquid 5, shafts 17, 17, . is provided protrudingly, and its upper part is loosely inserted into the shaft insertion holes 15a, 15a opened in the press ram 15, and the shaft 1
7, 17... are wound with springs 18, 18..., respectively, and an opening 14a is formed in the center 14 of the seal plunger 13, into which the processing needle 6 is loosely fitted. A flange 6a is provided on the head of the press ram 6, and an elastic spring 18 is wound between the lower surface of the flange 6a and the seal plunger 13. A hydraulic forging device characterized in that the flange portion 6a of the processing needle 6 is formed so as to be able to be pressed and hammered.