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1. US20090025444 - Die cushion control device

Office United States of America
Application Number 11908485
Application Date 13.03.2006
Publication Number 20090025444
Publication Date 29.01.2009
Grant Number 07918120
Grant Date 05.04.2011
Publication Kind B2
IPC
B21J 9/18
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
9Forging presses
10Drives for forging presses
18operated by making use of gearing mechanisms, e.g. levers, spindles, crankshafts, eccentrics, toggle-levers, rack bars
B21D 22/00
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
22Shaping without cutting, by stamping, spinning, or deep-drawing
B21C 51/00
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
51Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B-B21F195
B21D 24/14
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
24Special deep-drawing arrangements in, or in connection with, presses
10Devices controlling or operating blank holders independently, or in conjunction with dies
14pneumatically or hydraulically
Applicants Komatsu Ltd.
Komatsu Industries Corp.
Inventors Suzuki Yuichi
Agents Holtz, Holtz, Goodman & Chick, PC
Priority Data 2005-075336 16.03.2005 JP
Title
(EN) Die cushion control device
Abstract
(EN)

A die cushion controller controls an ascending/descending speed of a die cushion pad based on a preset pressure pattern and positional pattern. A position/pressure control switching unit constantly monitors and compares a first speed command signal υpc corresponding to a pressure deviation signal ep and a second speed command signal υhc corresponding to a position deviation signal eh, and selects a smaller one of the speed command signals to be sent to a speed control unit.