JP2011025292A - Closed forging die device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a closed forging die device capable of forming a forged article with high precision by a press of low pressure. <P>SOLUTION: An upper die set is lowered, a workpiece W is closed by an upper die 10 and a lower die 110, and the upper die set is further lowered and a wedge 4 enters the abutting part of a fixed block left side 105 and a fixed cam left side 107. The fixed cam left side 107 is moved to the right to hold the upper die 10 and the lower die 110. At the same time, the fixed block left side 105 and a cam holding plate 103 are moved to the left in the figure, a fixed cam right side 106 fixed to the cam holding plate 103 is also moved to the left to hold the upper die 10 and the lower die 110 (Figs. 1, 2). When the upper die set is further lowered, the workpiece pressed by a pressure pin 8 is filled in the cavity part of the upper and lower dies to complete the forming (Fig. 2). This closed forging device is capable of executing the pressing at the lower pressure of the press than that of the conventional closed forging die device. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention mainly relates to a closed forging die apparatus used when performing hot closed forging.

The conventional closed forging die apparatus uses the pressurizing pressure for both the mold clamping pressure and the molding pressure. For example, a device described in JP-A-2002-346678 is a known device.
The closed forging die device completes closed forging by lowering the upper die and pressurizing the upper and lower dies via a spring and then performing a pressure operation with a delay of the punches fixed to the upper and lower dies.

Since the closed forging die apparatus uses the pressing force for both the clamping pressure and the molding pressure, a press with a large pressing force is required. Furthermore, it becomes a complicated device such as a spring and a cam for pressurization.

In order to solve the problem, the closed forging die device according to claim 1 includes an upper die 10 for closing a work, a wedge 4 for moving down and moving a fixed cam of a lower die, a cam fixing block 5 and a pressure pin 8. Is a closed forging die device composed of a lower die set composed of an upper die set composed of a lower die 110 that closes a workpiece, and fixed cams 106 and 107 that move and sandwich an upper and lower die. .

In this apparatus, it is not necessary to pressurize the upper and lower dies 10 and 110, and they are fixedly held by the fixed cams 106 and 107. The only pressing force required at that time is the force with which the wedge 4 enters between the fixed cam left side 107 and the fixed block left side 105. That is, the force compresses the springs s1 and s2. The force is determined by the wedge tip angle α. The springs s1 and s2 need only have a force that pulls the fixed cams 106 and 107 back to open the upper and lower dies after molding, and is much smaller than the press clamping pressure. After entering the wedge 4, the fixed cams 106 and 107 for fixing the upper and lower dies 10 and 110 are fixed by the wedge 4 and the cam fixing block 5. After a short delay, the pressure pin 8 descends to complete the molding.

As described above, the present invention is a device that presses and forms a workpiece closed by an upper die with a pressure pin installed on an upper die set. The upper die is a fixed cam that slides with a wedge. By comprising a cam fixing block on the back surface of the fixed cam and a mechanism fixed by a wedge, closed forging can be performed with a low pressure press.

It is sectional drawing of the front of the closed forging die apparatus before shaping | molding. It is sectional drawing of the front of the closure forging die apparatus after completion of shaping | molding.

  An embodiment of closed forging according to the present invention will be described with reference to the drawings shown in FIGS.

The die unit is fixed to the ram (not shown) at the top of the press via the upper base plate 1 and moved up and down, and the lower die set is fixed to the bolster (not shown) via the lower base plate 101. It is comprised by.

In the upper die set, an upper die intermediate holding plate 3 is fixed to the upper base plate 1 via an upper die spacer 2. A wedge 4 and a cam fixing block 5 are fixed to the upper intermediate holding plate. The upper die 10 is held by the upper die intermediate holding plate 3 together with the upper die holding plate 9 at the center. The upper die 10 is held by the upper die holding plate (omitted) with a spring (omitted), and the upper die holding plate 9 is held by the upper die intermediate holding plate 3 by positioning pins (omitted). The spring s3 is held by the upper die holding plate 9 so that the spring holding pins 7 (actually four) are held inside, penetrate the upper die intermediate holding plate 3, and reach the lower end surface of the upper base plate 1. For positioning of the upper die 10, upper die guide pins 6 (actually four) penetrate the upper die intermediate holding plate 3 and are fixed to the upper die 10. The pressure pin 8 is fixed to the upper base plate 1.

In the lower die set, a lower die 110 is fixed to the lower die base plate 101 via a lower die holding block 102 at the center. The cam holding plate 103 is installed on the lower mold base plate 101 so as to slide in the left-right direction of the press. A fixed cam right side 106 and a fixed block left side 105 are fixed to the cam holding plate 103. A slidable fixed cam left side 107 is installed on a cam holding plate 103.

With the press stopped at the top dead center, the press is operated after the workpiece W is placed in the cavity of the lower die 110. The upper die set is lowered, and the upper die 10 first contacts the lower die 110. The upper die set is further lowered, and the wedge 4 enters the contact portion between the fixed block left side 105 and the fixed cam left side 107. The fixed block left side 105 and the cam holding plate 103 move to the left and the fixed cam right side 106 fixed to the cam holding plate 103 also moves to the left to hold the upper die 10 and the lower die 110. At the same time, the fixed cam left 107 moves to the right and holds the upper die 10 and the lower die 110 sandwiched therebetween.

After the upper and lower dies are firmly held by the fixed cam, the upper die set is further lowered, and the pressure pin 8 pressurizes the workpiece W to complete the molding.

As the upper die set rises after completion of molding, the fixed cam right side 106 is pulled back to the original position by the spring s2 via the return pin rp2, and the fixed cam left side 107 is pulled back to the original position by the spring s1 via the return pin rp1. It is.

1 Upper mold base 101 Lower mold base plate s1 2 springs
2 Upper mold spacer 102 Lower mold holding block s2 2 springs
3 Upper mold intermediate holding plate 103 Cam holding plate s3 4 springs
4 Wedge 104 Fixed block right side W Workpiece
5 Cam fixed block 105 Fixed block left
6 Upper guide pin 106 Fixed cam right
7 Spring retaining pin 107 Left of fixed cam
8 Pressure pin 110 Lower die
9 Upper die holding plate rp1 2 return pins
10 Upper die
rp2 2 return pins

JP 2002-346678

Claims (1)

Upper die that closes the workpiece, wedge that moves down and moves the fixed cam of the lower die, cam fixing block that fixes the fixed cam, upper die set consisting of pressure pins, and lower die that closes the workpiece It consists of a lower die set that consists of a fixed cam that moves and sandwiches the upper and lower dies. After the workpiece is closed with the upper and lower dies, the upper and lower dies are fixed with a fixed cam and closed forging with a pressure pin that descends late. Closed forging die device characterized by