JP2011025293A - 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 air cylinder is advanced to press a fixed die 111 and a movable die 112 against each other. After charging a workpiece W in a cavity part, a press is operated. An upper die set is 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 in the figure to hold the fixed die 111 and the movable die 112. At the same time, the fixed block left side 105 and a cam holding plate 103 are moved to the left, and a fixed cam right side 106 fixed to the cam holding plate 103 is also moved to the left to hold the fixed die 111 and the movable die 112. When the upper die set is further lowered, the workpiece pressed by a pressure pin 8 is filled in the cavity part of the dies to complete the forming. <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 is an upper die comprising a wedge 4 that moves down and moves a fixed cam of a lower die set, a cam fixing block 5, and a pressure pin 6. A closed forging die consisting of a set, a movable die 112 that moves by a fixed die 111 and an air cylinder 115 to restrain the workpiece W, and a lower die set that moves and sandwiches the die and fixed cams 106 and 107 Device.

In this apparatus, it is not necessary to pressurize the fixed die 111 and the movable die 112, and the fixed die 111 and the movable die 112 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 and opens the movable die 112 after the molding is completed. After entering the wedge 4, the fixed cams 106 and 107 for fixing the fixed die 111 and the movable die 112 are fixed by the wedge 4 and the cam fixing block 5, and the pressurizing pin 6 is lowered a little later to complete the molding.

As described above, the present invention is an apparatus that presses and forms the workpiece W closed by the dies 111 and 112 with the pressure pins 6 installed in the upper die set. It is fixed by sliding fixed cams 106 and 107. The fixed cam 107 is made of wedge 4 and the fixed cam 106 is fixed by the cam fixing block 5 so that it can be closed forged with a low pressure press. It will be.

It is sectional drawing of the front of the closed forging die apparatus before shaping | molding. It is sectional drawing of the plane of the closed forging die apparatus before shaping | molding. It is sectional drawing of the front of the closed forging die apparatus after shaping | molding. It is sectional drawing of the plane of the closed forging die apparatus of a molding word.

  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 pressure pin 6 passes through the upper mold intermediate holding plate 3 and is fixed to the upper base plate 1.

In the lower die set, a fixed die 111 is fixed to the lower die base plate 101 via a lower die holding block 102 at the center. The movable die 112 is composed of a movable die holding plate 113 and a rod.
It is held by the air cylinder 115 via 114 and installed so that it can slide on the lower die holding block 102.
The cam holding plate 103 is installed on the lower mold base plate 101 so as to slide in the horizontal direction of the press, and the fixed cam right side 106 and the fixed block left side 105 are fixed. 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 air cylinder 115 is moved forward, the fixed die 111 and the movable die 112 are pressed against each other, and then the workpiece W is placed in the cavity portion by a loading / unloading mechanism (not shown) and the press is operated. To do. The upper die set is 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 105 and the cam holding plate 103 move to the left and the fixed cam right 106 fixed to the cam holding plate 103 also moves to the left to hold the fixed die 111 and the movable die 112 therebetween. At the same time, the fixed cam left 107 moves to the right and holds the fixed die 111 and the movable die 112 therebetween.

After the dies 111 and 112 are firmly held by the fixed cam, the upper die set is further lowered, and the pressure pin 6 pressurizes the workpiece W to complete the molding.

After the molding is completed, as the upper die set is raised, the workpiece is pushed upward by the knock pins A and B and taken out by the carry-in / out mechanism (not shown). Further, the upper die set is raised, and 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.

1 Upper mold base plate 104 Fixed block right 114 Rod
2 Upper spacer 105 Left of fixed block 115 Air cylinder
3 Upper mold intermediate holding plate 106 Fixed cam right rp1 2 return pins
4 Wedge 107 Fixed cam left rp2 2 return pins
5 Cam fixing block 108 Dowel pin A s1 2 springs
6Pressure pin 109 Dowel pin B s2 2 springs
101 Lower mold base plate 111 Fixed die W Workpiece
102 die block 112 movable die
103 Cam holding plate 113 Movable die holding plate

JP 2002-346678

Claims (1)

An upper die set composed of wedges, cam fixing blocks and pressure pins that move down and move the fixed cam of the lower die set, and a movable die that moves by a fixed die and an air cylinder to restrain the workpiece. Closed forging die, which consists of a lower die set consisting of a fixed cam that sandwiches the die and that closes the workpiece with a fixed die and a movable die and then performs closed forging with a pressure pin that descends late apparatus.