JPS62234632A - Method of molding and manufacturing hollow body from solid semi-finished product - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for molding and manufacturing hollow bodies from solid semi-finished products that can be used to manufacture bottle-shaped products with various internal shapes and bottom shapes. . This method is used in the metal processing industry, especially in its small and medium production.

(Prior Art) Fluid press and rocking plate press methods are mainly used to mold and manufacture hollow bodies from solid materials at room temperature.

Both of these methods have poor flexibility due to the large amount of mold storage and the expensive molds due to the high loads that must be withstood, and are therefore only beneficial for high-volume production.

Combination with the cutting method in the machining process and production of internally threaded parts cannot be achieved with any of the above-mentioned methods. Furthermore, when fluid pressing steel, a pretreatment step is also necessary. The degree of shaping that can be achieved with rocker plate presses when producing pot-shaped products is significantly limited by the conical ram geometry and process conditions required for this process.

The method of manufacturing pot-shaped products using wedge-shaped rolling rolls proposed in German Democratic Republic WP Patent No. 99521 requires a line contact between the tool and the workpiece because a tool for shaping the outside cannot be used universally. This method requires a large rolling force, and has the disadvantage that it cannot be combined with cutting. In German Democratic Republic WP Patents No. 64024 and No. 89819 it is proposed to produce pot-shaped products by radial rolling with discs and deflection of the material to the edges. In the case of this method, the manufacture and base material (sheet metal) has to start from a disc, which is more expensive than the bar stock, and it is necessary to divert the material flow to the edge by means of a shoulder on the roll. , the thickness of the base metal sheet and the resulting deformation rate are significantly limited. Furthermore, due to the purely axial flow of material to the edges and the manner of turning of the material, internally circular products cannot be produced. Rolls cannot be universally adopted based on shoulder position.

(Problems to be Solved by the Invention) An object of the present invention is to create a solid body that can be manufactured in a particularly rotationally symmetrical hollow body having various main and auxiliary shapes in a rational manner while saving materials and processing costs. An object of the present invention is to provide a method for molding and manufacturing a hollow body from a semi-finished product.

The object of the invention is to produce solid materials which can be obtained with simple tools, simple tool movements and relatively small deformation forces, in which a large variety of geometries can be obtained, and in which the cutting process, in particular turning, can be combined with other deformations. The objective is to develop a method for molding and manufacturing hollow bodies from semi-finished products.

According to the invention, this object is achieved by producing hollow bodies from solid semi-finished products using forming rams, counter rams, chucks, one or more rolls and/or balls. In a forming manufacturing method, a solid, rotationally symmetrical, preferably room temperature semi-finished product is rotated between a forming ram and an opposing ram or in a chuck, and an axial force is applied by the forming ram. and the base material is brought to a predetermined stress state in which an axially progressive diameter reduction is initiated, preferably by rolls or balls, which is achieved by the penetration of the forming ram into the material. .

The material then undergoes plastic deformation, resulting in a superposition of the axial stresses generated by the forming ram and the axial and radial stresses generated by the rolls or balls. In this special deformation region, the displaced material flows radially and is then moved axially by rolls or balls or converted into an axial flow. The wall thickness of the hollow body thus produced, which is open on one side, corresponds to the gap between the forming ram and the roll or ball. The mold element on the end side that goes down to the bottom of the hollow body is
It is generated by corresponding negative dip molds in the forming ram and counter-ram. The forming process ends when the rolls or balls disengage or their feed motion stops.

(Example) An example of making a pot-shaped product from material A1 99.5 F7 will be described below.

FIG. 1 basically shows an embodiment, and FIGS. 2 and 3 show different embodiments.

The rotationally symmetrical semifinished product 4 to be formed is axially clamped between a forming ram 1 and a counterram 2 with a predetermined compressive force 5 . After the semifinished product 4 a3 and the counter-ram 2 have been rotated via the forming ram 1, the roll 6 begins its axial feeding movement. This roll 6 is placed in such a way that it gives the hollow body 8 the desired outer diameter. The material flowing from the core of the semi-finished product 4, together with the material from the edge region stretched by the rolls 6, is fed into the forming ram 1 in the axial direction in this process.
, forming the walls of the hollow body 8 .

The forming process ends when the roll 6 is no longer in contact with the hollow body 8. The completed hollow body 8 is removed by returning the opposing ram 2 and removing it from the forming ram 1 by means of a stripper (not shown).

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of the molding device and the product in the starting and ending positions, and FIGS. 2 and 3 are side views of the molding device and the product in the starting and ending positions of different embodiments, respectively. FIG. 3 is a partially sectional side view. DESCRIPTION OF SYMBOLS 1... Forming ram, 2... Opposing ram, 3... Jack, 4... Semi-finished product, 5... Axial force, 6... Roll, 7... Roll movement direction, 8... ...Hollow body.

Claims (1)

[Claims] In a method for molding and producing a hollow body from a solid semi-finished product using a forming ram, an opposing ram, a chuck, one or more rolls and balls, between the forming ram (1) and the opposing ram (2) , or the pressing of the forming ram (1) to bring the rotating solid semi-finished product (4) clamped in the chuck (3) into a predetermined state of stress, at the same time preferably in the axial direction by means of rolls or balls (6). carried out by a reduction in the diameter of the advancing semi-finished product (4), in which case the displaced material is transferred onto the forming ram (1);
A method for molding and producing a hollow body from a solid semi-finished product, characterized by flowing in the opposite direction to the direction of roll movement (7).