Press forming apparatus

Patent metadata

Field	Value
Publication number	US-12434292-B2
Application number	US-202217961344-A
Country	US
Kind code	B2
Filing date	Oct 6, 2022
Priority date	May 10, 2022
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

Disclosed is a press forming apparatus including a lower die assembly having a lower die, an upper die assembly having an upper die configured to be movable in a first direction relative to the lower die, a cam slider configured to be movable in a second direction relative to the lower die, and a conversion mechanism configured to convert a movement of the upper die assembly in the first direction into a movement of the cam slider in the second direction.

First claim

What is claimed is:

1. A press forming apparatus comprising:
a lower die assembly having a lower die;
an upper die assembly having an upper die configured to be movable in a first direction relative to the lower die;
a cam slider configured to be movable in a second direction relative to the lower die; and
a conversion mechanism configured to convert a movement of the upper die assembly in the first direction into a movement of the cam slider in the second direction,
wherein the conversion mechanism is configured to provide an external force for moving the cam slider toward the lower die when the upper die assembly and the lower die assembly are closed.

2. The press forming apparatus of claim 1 , further comprising:
a cam guide configured to guide the movement of the cam slider,
wherein the cam guide is disposed on at least one of the upper die assembly or the lower die assembly.

3. The press forming apparatus of claim 1 , wherein the conversion mechanism is disposed on at least one of the upper die assembly or the lower die assembly.

4. The press forming apparatus of claim 1 , wherein the conversion mechanism comprises:
a power cylinder including a power-side rod configured to be advanced or retracted in the first direction; and
a force-side rod hydraulically connected to the power cylinder and configured to be advanced or retracted in the second direction, and
wherein the force-side rod comprises a force cylinder directed toward the cam slider.

5. The press forming apparatus of claim 4 , wherein the power-side rod is configured to be retracted when the upper die assembly comes into contact with the lower die assembly, and
wherein a hydraulic fluid flows from the power cylinder to the force cylinder as the power-side rod is retracted, such that the force-side rod is advanced.

6. The press forming apparatus of claim 4 , wherein:
the power cylinder has a power-side hydraulic chamber configured to contain a hydraulic fluid,
the force cylinder has a force-side hydraulic chamber configured to contain the hydraulic fluid, and
the power-side hydraulic chamber hydraulically communicates with the force-side hydraulic chamber through a hydraulic conduit.

7. The press forming apparatus of claim 6 , wherein the force cylinder comprises:
a force-side piston; and
a force-side gas chamber separated from the force-side hydraulic chamber by the force- side piston,
wherein:
the force-side rod connected to the force-side piston,
the force-side gas chamber is filled with gas at a predetermined first pressure, and
the predetermined first pressure of the gas contained in the force-side gas chamber provides a biasing force that biases the force-side rod to a retracted position.

8. The press forming apparatus of claim 7 , wherein the conversion mechanism further comprises a force-side control block connected to the force-side gas chamber through a force-side gas conduit, and the force-side control block comprises a pressure gauge configured to check the predetermined first pressure.

9. The press forming apparatus of claim 6 , further comprising:
a coupling block connected to the force-side hydraulic chamber through a hydraulic fluid supply conduit,
wherein the coupling block is configured to remove air from the hydraulic fluid when the force-side hydraulic chamber is filled with the hydraulic fluid through the hydraulic fluid supply conduit.

10. The press forming apparatus of claim 6 , wherein the conversion mechanism further comprises a tank hydraulically connected to the power cylinder through a hydraulic passageway, and the tank comprises a tank-side hydraulic chamber configured to communicate with the power-side hydraulic chamber through the hydraulic passageway.

11. The press forming apparatus of claim 10 , wherein the tank further comprises:
a floating piston configured to be movable in the tank; and
a tank-side gas chamber separated from the tank-side hydraulic chamber by the floating piston,
wherein the tank-side gas chamber is filled with gas at a predetermined second pressure, and
wherein the predetermined second pressure of the gas contained in the tank-side gas chamber provides a biasing force that biases the power-side rod to an advanced position.

12. The press forming apparatus of claim 11 , wherein the conversion mechanism further comprises a tank-side control block connected to the tank-side gas chamber through a gas conduit, and the tank-side control block comprises a pressure gauge configured to check the predetermined second pressure.

13. The press forming apparatus of claim 4 , further comprising:
a push member provided to face the power-side rod of the power cylinder,
wherein the push member is aligned with a longitudinal axis of the power cylinder, and
wherein the power-side rod is retracted by being pushed by the push member when the upper die assembly comes into contact with the lower die assembly.

14. The press forming apparatus of claim 1 , wherein the lower die comprises:
a first forming surface directed toward the upper die;
a second forming surface directed toward the cam slider; and
a rounded corner formed between the first forming surface and the second forming surface, and
wherein the upper die comprises a first pressing surface complementary to the first forming surface, and the cam slider comprises a second pressing surface complementary to the second forming surface.

15. The press forming apparatus of claim 2 , wherein the upper die assembly comprises an upper die housing on which the upper die is mounted,
wherein the cam guide is mounted on the upper die housing, and
wherein the movement of the cam slider is guided by the upper die and the cam guide.

16. The press forming apparatus of claim 4 , wherein the cam slider comprises a pad aligned with the force-side rod of the force cylinder.

17. The press forming apparatus of claim 1 , wherein the cam slider is configured to move between an advanced position to which the cam slider is advanced to press a workpiece supported on the lower die and a retracted position to which the cam slider is retracted away from the lower die, and
wherein the press forming apparatus further comprises a biasing member that biases the cam slider to the retracted position.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Park Sang Wook
• Choi Yong Shin

Classifications

• B21D53/88

  other parts for vehicles, e.g. cowlings, mudguards · CPC title

• B21D43/06

  by positive or negative engaging parts co-operating with corresponding parts of the sheet or the like to be processed, e.g. carrier bolts or grooved section in the carriers · CPC title

• B30B15/062

  Press plates · CPC title

• B30B7/04

  wherein pressing is effected in different directions simultaneously or in turn · CPC title

• B21D22/02

  Stamping using rigid devices or tools · CPC title