JPS6050537B2 - Manufacturing method for hollow products with flanges - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a flanged hollow product in which a hollow product having a flange at one end is continuously formed from a plate material.

Many flanged hollow products or similar products can be seen, such as the plug body (blind hole) shown in Figure 1A, and the gear blank (through hole) shown in the mouth.

The most rational method of manufacturing these flanged hollow products is shown in Figures 2A and 3.

The punch a has an outer diameter equal to the outer diameter of the product flange part g, and a through hole e having an inner diameter equal to the outer diameter of the product hollow part.

A restraint ring b is slidably fitted around the outer periphery of the punch a, and a pressure plate c is placed at the bottom. A mandrel d having an outer diameter equal to the inner diameter of the product inner hole i is slidably held at the center of the pressure plate c.
Then, in a sealed cavity j having an inner diameter equal to the outer diameter of the product flange part g formed between the punch a, the pressure plate c, and the restraining ring, a workpiece f having an outer diameter approximately equal to or slightly smaller than this is housed. (Figure 2 A). In this way, punch a and pressure plate c
The mandrel d is inserted into the cavity j while holding the workpiece f with
Push it out inside.

The outer periphery of the workpiece f is compression-molded to the thickness of the product flange g, and the material extruded inward forms a depression in the center of the lower surface and rises and flows into the through hole e of the puncher a. By protruding d, the indentation is shaped while assisting the flow, forming the inner hole i of the 5 products, making the wall thickness of the hollow part of the product uniform, and adjusting the external shape, so that the flange is formed all at once. A hollow product is formed (Fig. 4). By attaching a die hole k corresponding to the mandrel d to the tail end of the through hole e of the punch a and punching out the top of the cap-shaped protrusion, the product inner hole 1 can be made into a through hole ( Figure 3)
.

In the case of the above manufacturing method, the workpiece must be preformed into a shape close to the external shape of the product flange.

It is necessary to set this one by one, which poses a difficulty in automating this method, especially when the flange shape is complex. The present invention solves the above-mentioned difficulties and provides an improved method for manufacturing flanged hollow products in which the products are continuously obtained from plate materials.

The method of the present invention will be explained in detail below, with reference to FIG. 4 and subsequent figures, using an example of manufacturing a cylindrical plug.

The punch fitting 1 has an outer diameter equal to the outer diameter of the product flange portion 7,
A mandrel 2 with an outer diameter equal to the outer diameter of the product inner hole 9 is placed at the shaft center.
is slidably held.

The die fitting 3 has a bottomed die hole 4 with an inner diameter equal to the outer diameter of the product flange portion 7, and a through hole 6 with an inner diameter equal to the outer diameter of the product hollow portion 8 is provided in the bottom surface 5 of the die hole 4. Both metal fittings 1
, 3 face each other so that they can be pressurized, and a plate holder 1 is attached to the outer periphery of the punch fitting 1.
0 is slidably fitted, and the spring 11 is applied to lower the pressure.

Further, an ejector 12 is provided in the die fitting 3 and the through hole 6. A plate material 13 such as a band iron is set between the metal fittings 1 and 3 (Fig. 4). The working process is to first bring both metal fittings 1 and 3 closer together. to clamp the plate material 13 (Fig. 5). Next, the punch fitting 1 is pressed down, and the plate material 13 is punched out between the die hole 4 and the workpiece 14 having the outer diameter dimension of the product flange portion 7.

The workpiece 14 is accommodated in the die hole 4 (FIG. 6).
Subsequently, the punch fitting 1 is pressed down to compress the workpiece 14 between it and the die hole bottom surface 5, and at the same time, the mandrel 2 is pushed downward.

The outer peripheral part of the workpiece 14 is compressed into the product flange part 7, and a depression is created in the center of the upper surface of the material pushed inward and flows into the through hole 64, and the ejecting action of the mandrel 2 assists the flow. While shaping the depression, the inner hole 9 of the product is formed, the thickness of the hollow part 8 of the product is made uniform, and the outer shape is adjusted.
The plug body is formed all at once (Fig. 7). Next, both metal fittings 1, 3 and mandrel 2 are returned, and ejector 12
Push up to pull out the plug from the through hole 6 and die hole 4 (FIG. 8). In this way, one plug is manufactured, and the plate material 1
3 is laterally moved to return to the state shown in FIG. 4, and the above steps are repeated to continuously manufacture plugs one after another from the plate material 13.

It is also possible to provide a die hole corresponding to the tip of the mandrel 2 in the upper end surface of the ejector 12 so that the inner hole 9 is a through hole.

Incidentally, the punch metal fitting 1 in the present invention corresponds to the pressure plate c shown in FIGS. 2 and 3, and the die metal fitting 3 corresponds to the punch a and the restraining ring b integrally formed i. .

As a modification, the restraint ring b may be integrated with the pressure plate c side and the plate material may be punched between it and the punch a. However, in the latter case, the pressure receiving area of the punch a is smaller than that of the punch fitting 1 in the former case, so the former is more reasonable in terms of tool life. The method for manufacturing a flanged hollow product of the present invention is carried out using the above-mentioned tools and the above-described steps, and as in the conventional method, the workpiece is pre-processed into a predetermined shape and then supplied. Because it can be directly formed from plate material without any process, it is unique in that it can efficiently manufacture flanged hollow products of all shapes, such as plugs, gear blanks, and gears with bosses, as well as similar products. be.

[Brief explanation of drawings]

Figure 1 shows an example of a hollow product with flanges, A is a vertical cross-sectional view of the plug body and gear blank, and Figure 2 shows an apparatus for explaining the principle of the manufacturing method for hollow products with flanges, A is before processing. ,
Fig. 3 is a longitudinal cross-sectional view showing the state at the final stage of processing, Fig. 3 is a longitudinal cross-sectional view of an apparatus illustrating the principle of the method for manufacturing flanged hollow products with through holes, and Fig. 4 is a longitudinal cross-sectional view showing an embodiment of the method of the present invention. A longitudinal cross-sectional view of the illustrative apparatus, and FIGS. 5 to 7 are in the middle of the same processing,
FIG. 8 is a longitudinal sectional view showing the state at the final stage of processing. 1... Punch fitting, 2... Mandrel, 3... Die fitting, 4... Die hole, 5...
...Bottom, 6...Through hole, 7...
Product flange part, 8...Product hollow part, 9...
... Product inner hole, 12 ... Ejector, 13.
...Plate material, 14...Work material.

Claims (1)

[Claims] 1. A punch fitting for punching the outer contour of the product flange part and a die fitting having a bottomed die hole are provided facing each other so as to be pressurizable, and the axial center of one of the fittings is provided with a punch fitting for punching the outer contour of the product flange. A mandrel having an outer contour equal to the inner contour is slidably held, a through hole with an inner contour equal to the outer contour of the hollow part of the product is provided at the axial center of the other metal fitting, and a plate material is inserted between both metal fittings. By clamping and applying pressure, the plate material is first punched into the die hole using the tip of the punch metal fitting and the die hole as the work material of the outer shape of the product flange, and then the punched work material is inserted between the bottom of the die hole and the punch. By protruding the mandrel while applying pressure, the outer periphery of the workpiece is formed to the thickness of the product flange, and at that time, a part of the material rises and flows into the through hole of the die fitting, and the protruding mandrel Form a cap-shaped hollow part of the product by the action of A method for manufacturing a flanged hollow product, characterized in that the steps are repeated.