PRESS FORMING METHOD AND TOOL FOR PRESS FORMING

• US 20190321873A1
• Filed: 06/28/2019
• Published: 10/24/2019
• Est. Priority Date: 05/19/2014
• Status: Active Grant

• Current Assignee: Nippon Steel Corporation
• Original Assignee: Nippon Steel Corporation
• Inventors: WADA, Yasuhiro, YAMAMOTO, Shuji, YAMAGATA, Mitsuharu
• Granted Patent: US 11,407,019 B2
• Time in Patent Office: Days
• CPC Class Codes: B21D 22/06 having relatively-movable die parts
• CPC Class Codes: B21D 22/20 Deep-drawing special deep-drawing arrangements in, or in connection with, presses B21D24/00
• CPC Class Codes: B21D 24/00 Special deep-drawing arrangements in, or in connection with, presses
• CPC Class Codes: B30B 15/0094 Press load monitoring means B30B15/281 takes precedence

Abstract

A press forming method includes a first process of obtaining a pressing force applied to each portion of a tool by an workpiece material during press forming while independently driving the respective each portion of the tool divided into multiple portions and press forming the workpiece material, and a second process of adjusting at least one of an applied driving force, an applied driving speed, and an applied driving timing for each portion of the tool to cause a processing portion of the workpiece material in which the state approaching an overload state is detected based on the pressing force to flow to other processing portions of the workpiece material.

Claims

1. A tool for press forming comprising:

a tool including a punch, a die and an outer circumferential punch in which each of the punch and the outer circumferential punch individually receives a driving force and press forms an workpiece material,

wherein a sensor which measures a deformation amount of the die for obtaining a pressing force which is applied to the die from the workpiece material during press forming and detecting that the tool is in a state approaching an overload state based on the pressing force applied to the die, and

wherein at least one of the punch and the outer circumferential punch is controlled by at least one of a driving force, a driving speed, and a driving timing, the control being adjusted based on a detection that the tool is in the state approaching the overload state based on the pressing force applied to the die.

2. The tool for press forming according to claim 1,

wherein the tool for press forming is used for drawing so that the workpiece material is formed into a cylindrical member having an axis line, and

wherein the sensor is provided at multiple locations along a circumferential direction of which the center is the axis line.

3. The tool for press forming according to claim 1,

wherein the tool for press forming is used for drawing so that the workpiece material is formed into a cylindrical member having an axis line, and

wherein the sensor is provided at multiple locations along an extension direction of the axis line.

4. The tool for press forming according to claim 3,

wherein the sensors are further provided at multiple locations along a circumferential direction of which the center is the axis line.

5. The tool for press forming according to claim 1,

wherein the sensor is a strain sensor.

6. The tool for press forming according to claim 5,

wherein a detection unit of the strain sensor is provided at a position at a depth of 5 mm to 50 mm from a forming surface of the die on which the strain sensor is provided.