US-20260124662-A1 - PRESS-MOLDING DEVICE

Abstract

A press-molding device works on a workpiece and includes a punch, a die provided with a hollow portion into which the punch is inserted, a material presser disposed on an outer periphery of the punch and facing the die, a pad disposed in a hollow portion of the die, a pressing unit configured to press the pad toward the punch, and a load sensor disposed between the pad and the pressing unit.

Inventors

• Hideaki Hamada
• Hiroyuki NAOE
• Masato Omori

Assignees

• PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Dates

Publication Date

20260507

Application Date

20251105

Priority Date

20230522

Claims (8)

1. 1 . A press-molding device that works on a workpiece, the press-molding device comprising: a punch; a die provided with a hollow portion into which the punch is inserted; a material presser disposed on an outer periphery of the punch and facing the die; a pad disposed in a hollow portion of the die; a pressing unit configured to press the pad toward the punch; and a load sensor disposed between the pad and the pressing unit.
2. 2 . The press-molding device according to claim 1 , further comprising a position sensor configured to acquire information for detecting a position of the punch.
3. 3 . The press-molding device according to claim 1 , further comprising: a driver configured to drive the punch, and a control unit configured to control the driver, the pressing unit, and the load sensor.
4. 4 . The press-molding device according to claim 3 , wherein the control unit calculates a molding load for molding the workpiece based on a load detected by the load sensor and a reaction force of the punch, and controls the driver based on the molding load.
5. 5 . The press-molding device according to claim 1 , further comprising: a die plate configured to hold the die, and a gap sensor configured to detect an amount of a gap between the material presser and the die plate.
6. 6 . The press-molding device according to claim 1 , wherein the pressing unit includes a cylinder having a piston movable in a moving direction of the punch.
7. 7 . The press-molding device according to claim 6 , wherein the cylinder is an air cylinder, and the press-molding device further includes a regulator configured to control an internal pressure of the air cylinder to a constant pressure.
8. 8 . The press-molding device according to claim 1 , wherein a height of the pad is larger than a depth of the hollow portion of the die.

Description

TECHNICAL FIELD The present disclosure relates to a press-molding device. BACKGROUND ART It is generally known to perform manufacturing while measuring a working load when performing punching, bending, drawing, and the like on a plate-shaped workpiece by press working. For example, PTL 1 discloses a punching machine including a punch, a die, a holder, and a counter, in which a metal material to be worked is sandwiched and held between the die and the holder, and the punch is moved to shear the metal material to be worked with the punch and the die. In the punching machine described in PTL 1, the metal material to be worked is sandwiched between the punch and the counter, an electric current is applied between an electrode disposed in the holder and an electrode disposed in the counter, and a current is applied to a portion of the metal material to be sheared to melt and rupture the portion. The time point (time) at which an electric current is started to be applied between the electrodes is determined by detecting a shear load by a sensor. PTL 2 discloses a punching device that punches a flat material to be worked with a punch. The punching device described in PTL 2 includes a measuring instrument for obtaining translational forces generated in directions of two orthogonal axes in a plane orthogonal to an axis along a punching direction by the punch, among forces generated when the material to be worked is punched. CITATION LIST Patent Literature PTL 1: Unexamined Japanese Patent Publication No. 2005-46873PTL 2: Unexamined Japanese Patent Publication No. 2020-138210 SUMMARY OF THE INVENTION However, in the devices described in PTL 1 and PTL 2, there is room for improvement in accurately detecting a load applied to a workpiece. The present disclosure provides a press-molding device capable of accurately detecting a load applied to a workpiece. A press-molding device according to an aspect of the present disclosure works on a workpiece and includes a punch,a die provided with a hollow portion into which the punch is inserted,a material presser disposed on an outer periphery of the punch and facing the die,a pad disposed in a hollow portion of the die,a pressing unit configured to press the pad toward the punch, anda load sensor disposed between the pad and the pressing unit. The present disclosure can provide a press-molding device capable of accurately detecting a load applied to a workpiece. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating an example of a press-molding working device according to a first exemplary embodiment of the present disclosure. FIG. 2 is an overview illustrating a process of performing molding work on a workpiece with a press-molding device. FIG. 3 is a flowchart illustrating an example of processing of the press-molding device according to the first exemplary embodiment of the present disclosure. FIG. 4 is a graph illustrating an example of a relationship between a load applied to a load sensor and a position of a punch in a case where a workpiece is mold-processed by the press-molding device. BACKGROUND TO PRESENT DISCLOSURE Press working is generally used in a wide variety of fields such as home appliances, precision machines, and automobile parts. For example, in punching, bending, drawing, and the like in which press working is performed on a plate-shaped workpiece, a workpiece loaded on a die is pressed by a material presser, and a part of the workpiece is pushed into a hollow portion of the die by a punch to be punched or molded. Thus, the workpiece is worked into a predetermined shape. In a press-molding device that performs press working, there is known a device that controls a working state while monitoring a load (working resistance) during the work applied to a tool by a load sensor attached to a die tool such as a punch. The present inventors have newly found that there is a problem that a load applied to a workpiece cannot be accurately detected when a load sensor is attached to a punch. For example, in a case where pressure of a material presser or the like cannot be sufficiently secured, sliding resistance between the material presser and the punch may increase due to external influences or the like in which a force of the material presser is applied in a direction of a side surface of the punch. When the load sensor is attached to the punch, a working reaction force (working resistance) transmitted to the load sensor via the punch increases due to an increase in sliding resistance. Therefore, the load detected by the load sensor is measured at a value larger than a molding load for actually molding the workpiece. The present inventors have studied a press-molding device capable of stably performing load sensing on a workpiece so that a load applied to the workpiece can be accurately detected in press-molding working, and have reached the present disclosure. One exemplary embodiment of the present disclosure will now be described with refer