DE102006036048A1 - Mold-part deep-drawing method for progression tool, involves attaching sheet metal to inner horizontal drawing punch and outer horizontal drawing case, where rest flange of hollow body runs through deformed zone of draw ring - Google Patents

Abstract

The method involves guiding an inner horizontal drawing punch (32) horizontally to an outer horizontal drawing case (31). The inner horizontal drawing punch is received in relation to the outer horizontal drawing case during the shaping of a variable relative stroke delta. A sheet metal is attached to the inner horizontal drawing punch and the outer horizontal drawing case. A rest flange of a hollow body runs through a deformed zone of a draw ring (21). A relative stroke delta is controllably steered after a sequencing program.

Description

The The invention relates to a method according to the preamble of Claim 1.

State of the art

An overall composite tool for deep-drawing sheet metal blanks is both in the patent specification DE 102 07 031 B4 both in the published patent application DE 10 2004 036 122 A1 known.

The There tools described contain two or more drawing punches which led into each other and two or more matrices. The drawing stamps are the respective ones Assigned to drawing dies and can Partially through them.

In Such Gesamtverbund- or Folgezugwerkzeugen can the Moldings in several successive drawing stages without further transport in another thermoforming tool to a cylindrical or partially unzylindrischen rotary hollow body transformed become. With such thermoforming tools can be comparatively size Limiting drawing ratios reach, so comparatively large deformations of the hollow parts in the direction of pulling.

One special attention in the production of e.g. Pressurized containers the resulting after the forming sheet thickness over the longitudinal section during it different ways gives the frame of the hollow body Targeted influence, so are the possibilities of a targeted Influencing the thickness of the sheet or the course of strength of the soil much lower.

Known options For example, to influence the thickness of the sheet in the floor area a special geometric design of the floor. Furthermore can be determined by a specific friction parameter of the surface of the Stamp on the sheet metal surface the sheet metal flow and thus the target variables are influenced.

Farther Methods are known in which in several operations in Follow-on composite of the target area of the bottom surface are first preformed.

task

It is therefore an object of the invention, by a targeted procedure while the deformation of the resulting sheet thickness distribution in the floor area respectively. to influence the resulting consolidation in the same area and the respective task according to exactly perform.

in this connection can different tasks occur. It is for example Stainless steel beer kegs necessary to achieve a high solidification in the soil area. This serves to protect the valve sleeve.

at pressure vessels such as fire extinguishers, Gas bottles, air tanks or refrigerant bottles Another task is the, the sheet thickness course is not below a minimum wall thickness respectively. At the same time, however, the gradient of the course of thickness should be in the bottom area be low in order not to unnecessarily use material in this area.

These Task is first solved by a method having the features of claim 1.

there is entered by the lead Delta H of the inner punch membranes clamping the sheet around the punch and / or around the outside punch sleeve reached. As a result, the sheet is stretched in the bottom area.

Becomes now the supply Delta H still during the Reshaping brought to zero spreads the accumulated in the soil Sheet metal in the wall of the hollow part. The process can now still during the forming be repeated as often as you like.

It has proved to be useful apply the relative stroke if and only if the resulting power play is the largest among the stamps.

Of the Process of stripping in the ground area can be achieved by a coordinated Support metal holder force.

embodiments

embodiments The invention are illustrated in the drawings and will be described in more detail below.

It demonstrate

1 : A complete composite tool with inserted board

2 : An overall composite tool during the forming with a relative stroke ( 36 ) Delta H = 0

3 : An overall composite tool during the forming with a relative stroke ( 36 ) Delta H = Max.

4 : A composite tool in the process

This in 1 shown overall composite tool ( 10 ) comprises a die ( 20 ) and a patrix ( 30 ). The male contains a first drawing punch ( 31 ) also pulling sleeve ( 31 ) and an inner stamp ( 32 ) also Endkonturstempel ( 32 ) because this contains the geometric information of the desired final geometry. The matrix ( 20 ) contains a first drawing die ( 21 ) for the first thermoforming and a second drawing die ( 22 ) for the finished train. The two matrices ( 21 ) 22 ) are rigid over the pulling chair ( 23 ) fixed to each other. To the pulling sleeve ( 31 ) is arranged surrounding the blank holder ( 33 ). Between sheet holder ( 33 ) and the first drawing die ( 21 ), the sheet metal plate is clamped.

In 2 is an intermediate stage of the transformation can be seen. Due to the uniform penetration of the punch ( 32 ) and the punch sleeve ( 31 ) by the uniform movements ( 34 ) 35 ), the sheet becomes a hollow body ( 42 ) transformed. This reduces the diameter ( 41 ) of the board ( 40 ) and the resulting hollow part ( 42 ) thus has a flange ( 44 ) on. Remains the Relativhub ( 36 ) Delta H = 0 so a flat bottom forms ( 43 ) out.

Will now be like in 3 can be seen through various movements ( 34 ) 35 ), the relative stroke ( 36 ) Delta H increases from this a membran clamping of the hollow body ( 42 ) where the resulting bottom partially on the stamp ( 32 ) and on the stamp sleeve ( 31 ) applies. This results in a ironing and additional solidification of the bottom of the hollow body ( 42 ). In further progress, the relative stroke ( 36 ) Delta H be led to zero, whereby the excess material in the bottom area in the wall of the hollow body ( 42 ).

In 4 you recognize the further process flow. The pulling sleeve ( 31 ) moves to the die ( 22 ) and re-tension the sheet. When driving through the final contour stamp ( 32 ) through the die ( 22 ) experiences the hollow part ( 42 ) the transformation to the final geometry.

Claims (7)

Method for deep-drawing a molded part with an overall composite tool ( 10 ) to a hollow body ( 42 ) with a die ( 20 ) which has a first drawing ring ( 21 ) and at least one other drawing ring ( 22 ) and with a patrix ( 30 ), which is a first pulling sleeve ( 31 ) and at least one further drawing punch ( 32 ) comprises the inside lying to the sleeve ( 31 ), characterized in that the inner drawing punch ( 32 ) relative to the outer pull sleeve ( 31 ) undergoes a variable relative displacement delta H during forming, whereby the metal sheet on the punch ( 32 ) and the pulling sleeve ( 31 ) while the residual flange ( 44 ) of the hollow body ( 42 ) nor the forming zone of the first drawing ring ( 21 ) goes through. Method according to claim 1, characterized in that the relative stroke ( 36 ) Delta H is applied controlled by a sequence program. Method according to claim 1, characterized in that the relative stroke ( 36 ) Delta H is applied regulated by a manipulated variable. A method according to claim 3, characterized in that the manipulated variable of the force curve below the punch ( 32 ) 31 ). A method according to claim 3, characterized in that the manipulated variable is a statistically recorded feature of the hollow part ( 42 ) is (statistical process control). Method according to one of the preceding claims, characterized in that the blank holder force as a function of the relative stroke ( 36 ) Delta H is applied controlled as a manipulated variable. Method according to one of the preceding claims, characterized in that the relative stroke ( 36 ) Delta H is returned to zero during deformation and then reapplied.