Method of producing hollow articles by deep drawing

• US 4,470,287 A
• Filed: 09/02/1982
• Issued: 09/11/1984
• Est. Priority Date: 12/21/1978
• Status: Expired due to Term

• Current Assignee: Anatoly S. Matveev, Anatoly V. Razhev, Boris N. Leonov, Evgeny A. Antonov, Nikolai I. Nikonov, Vyacheslav I. Prokofiev
• Original Assignee: Anatoly S. Matveev, Anatoly V. Razhev, Boris N. Leonov, Evgeny A. Antonov, Nikolai I. Nikonov, Vyacheslav I. Prokofiev
• Inventors: Matveev, Anatoly S., Nikonov, Nikolai I., Antonov, Evgeny A., Leonov, Boris N., Prokofiev, Vyacheslav I., Razhev, Anatoly V.
• Primary Examiner(s): Gilden, Leon
• Application Number:
  US06/414,354
• Time in Patent Office: 740 Days
• Field of Search: 72/347, 72/348, 72/349, 72/350, 72/57, 72/453.02
• US Class Current: 72/347
• CPC Class Codes: B21D 22/205 Hydro-mechanical deep-drawing
• CPC Class Codes: B21D 24/04 Blank holders; Mounting means therefor

Abstract

A press for manufacturing hollow articles by deep drawing comprising a high pressure vessel (1) accommodating a die (3) with a punch (4). A blank (14) is accommodated in an annular high pressure chamber (16) communicating with a high pressure chamber (19) of an intensifier (20). The press also comprises a device (27) for regulating pressure in the annular chamber to control pressure acting upon the peripheral portion of a blank in accordance with a preset law, an appliance (39) for setting pressure in the annular chamber is made in the form of a tracer whose profile is equidistant with the curve characterizing the alteration of pressure in the annular chamber (16).

Claims

1. A method of producing hollow articles by deep drawing, wherein the central portion of a blank positioned on a die is sealingly separated from the blank peripheral portion, said method comprising:

(a) providing a rigid punch to act against one face of the blank central portion;

(b) pressurizing the other face of the blank central portion with a first high pressure fluid from a first high pressure fluid source;

(c) pressurizing the peripheral portion of the blank with a second high pressure fluid from a second high pressure fluid source;

(d) providing pressure intensifying means to selectively intensify the second high pressure fluid acting on the peripheral portion of the blank;

(e) providing a linearly movable cam having a predetermined cam profile for regulating the pressure intensifying means;

(f) regulating the pressure intensifying means so that the second high pressure fluid acts on the blank peripheral portion at a predetermined pressure level in cooperation with the operation of the punch;

(g) sensing the linear position of the cam to regulate the fluid pressure q acting on the blank peripheral portion in accordance with the following law;

##EQU4## where β

is the coefficient accounting for the influence of an average main stress of the blank material;

σ

_s is the yield stress of the blank material;

R_i is the blank running radius;

R_o is the punch radius;

t is the wall-thickness of a finished product;

σ

₁ is the stress on the inner edge of the peripheral portion of a blank.