JPH0451005Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention forms a forging space inside a frame, fixes a lower mold in this forging space, and performs the above-mentioned forging with an upper mold opposite to the lower mold. This invention relates to a link type stamp hammer that is attached to a ram that is guided and driven up and down in a space and performs die forging by lowering the ram.

[Conventional technology]

In a die-forging forging machine, compressed air is introduced to the bottom of the piston of an air cylinder to raise the ram, the piston rod is gripped by a catch, and then the catch is loosened with a pedal operation to allow the free fall of the ram to form the die. In addition to blow stamp hammers that perform stamping, there are air stamp hammers that send compressed air under the piston to raise the ram, then direct the compressed air to the top of the piston, and use the accelerated kinetic energy to stamp. 1986-999) or a screw press in which the ram is suspended from a screw shaft threaded through the frame, the screw shaft is rotated by an air motor, and the ram is lowered to perform stamping.
16240), but all of these basically have a ram suspended on a rod or screw shaft, and this rod or screw shaft is driven by an air cylinder or an air motor. The ram is moved up and down, and forging is performed using an upper die provided on the ram and a lower die fixed below it.

[Problem that the invention attempts to solve]

Therefore, when looking at the forging capacity (the striking force of the ram), for any of these types of die-forging machines, the die-cutting speed of the ram, that is, the descending speed of the ram, determines the forging capacity. However, in the case of the blow stamp hammer mentioned above, the ram descends in free fall, and the upper part of the piston is not pressurized with compressed air, so even if it is economical in terms of power, there is a natural limit to the descending speed of the ram. It was hot. Also, in the case of an air stamp hammer, the upper part of the piston is pressurized when the ram descends, so the ram's descending speed can be higher than that of a blow stamp hammer.
In order to make this pressurization and the descending speed of the ram effective, it is necessary to increase the capacity of the air compressor and to increase the supply speed of compressed air to the air cylinder, which increases the equipment cost and structure. However, there were issues that required mechanical precision, such as the adoption of a sophisticated seal structure.

Furthermore, in the case of the screw press, it is difficult to expect the ram to descend at a high speed due to a defect in the movement mechanism itself that converts the rotation of the screw shaft into the raising and lowering of the ram, and in order to compensate for this, it is essential to employ a large-capacity air motor. It was hot.

This idea uses a hydraulic cylinder to raise and lower the ram, and by increasing the driving force of this hydraulic cylinder with a double speed mechanism to speed up the raising and lowering of the ram, it has a simple mechanism and low manufacturing cost. The purpose is to provide a link type stamp hammer that exhibits high forging performance.

[Means for solving problems]

This idea includes mounting a hydraulic cylinder on the top of the frame, and attaching a gate-shaped drive rod that straddles the hydraulic cylinder to the upper end of a piston rod that protrudes upward from the hydraulic cylinder and moves back and forth. , a pin below the pivot point of the pantograph mechanism is equipped at the lower end of both legs of the drive rod so as to extend and contract in the vertical direction by pivoting the upper end into the forging space on the upper bracket of the frame type frame. The pantograph mechanism is connected to each other, and further features a link type stamp hammer in which the ram is suspended from the lower end of the pantograph mechanism.

[Effect]

According to this invention, the vertical speed of the drive rod driven up and down by a hydraulic cylinder is input to the ram through a double speed mechanism called a pantograph mechanism.
The vertical stroke of the ram doubles the stroke of the drive rod, and the downward speed of the ram is also much higher than the operating speed of the hydraulic cylinder, increasing the striking force of the ram.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

In Figures 1 and 2, frame type frame 1
A vertically elongated forging space 2 is formed inside, a saw block 3 is fitted into the lower part of this forging space 2, and a lower die 4 of the forging die is attached to the upper surface of the saw block 3.
In addition, guide rails 5 are provided on both sides of the upper part of the forging space 2.
A ram 6 is fitted onto the guide rail 5 so as to be movable up and down, and an upper mold 7 that pairs with the lower mold 4 is attached to the lower surface of the ram 6.

A hydraulic cylinder 8 is mounted on the top of the frame type frame 1, and a piston rod 9 projects upward from the hydraulic cylinder 8, and a gate-shaped drive is fitted at the projecting tip to straddle the hydraulic cylinder 8. The upper central portion of the rod 10 is integrally joined, and the drive rod 10 is moved up and down by selectively supplying hydraulic pressure to the hydraulic cylinder 8 through pipes 11 and 12.

Inside the forging space 2, a pantograph mechanism 14 whose upper end is pivotally supported by a bracket 13 of the frame type frame 1 and whose lower end suspends the ram 6 is installed. This pantograph mechanism 14 is a well-known double speed mechanism in which large and small sets of equal length links 15 and 16 are pivotally connected with pins 17 and 18, respectively, and expands and contracts in the vertical direction, thereby causing the ram 6 to move. It is moved up and down according to the guide rail 5. And the drive rod 1
Both legs 10a of 0 are hung down toward the forging space 2, and a connecting pin 19 is installed across both legs.
A pantograph mechanism 14 is connected to the pantograph mechanism 14. Incidentally, the connection point between the pantograph mechanism 14 and both legs 10a of the drive rod 10 by the connection pin 19 is naturally the point A where the upper end of the pantograph mechanism 14 is connected to the bracket 13 of the frame type frame 1 (see Fig. 2). (indicated by an arrow) so that the pantograph mechanism 14 can be reliably expanded and contracted by raising and lowering the drive rod 10. In addition, when connecting the pantograph mechanism 14 and the ram 6, a rod 21 is passed through the pantograph mechanism 14 to the plate 20 on the upper surface of the ram, and the rod 21 is fitted with nuts 22 at the top and bottom of the plate 20, respectively. The stopped springs 23 are fitted in a mantle, and the impact at the time of stamping is absorbed by these springs 23.
I try to absorb it.

During the forging process, the drive rod 10 is raised by the piston rod 9 of the hydraulic cylinder 8 to pull up the pantograph mechanism 14 and the ram 6. Due to this pulling up, the pantograph mechanism 14 is in a contracted state. Therefore, a workpiece material (not shown) is placed on the lower mold 4, and then the direction of hydraulic pressure supply to the hydraulic cylinder 8 is changed (that is, hydraulic pressure is applied to the upper part of the piston), and the drive rod 10 is lowered, so that the pantograph mechanism 14 is extended downward at once from the upper end pivotally connected to the bracket 13, and the ram 6 is lowered to perform stamping. During this stamping, even if the movement stroke of the piston rod 9 in the hydraulic cylinder 8, that is, the downward stroke of the drive rod 10, is small, these movements are transmitted to the ram by the extension of the pantograph mechanism 14, which is a speed-doubling mechanism, so that the above-mentioned stroke is converted into a large stroke by the pantograph mechanism 14, and the ram 6 descends at a speed twice the movement of the hydraulic cylinder 8. For example, piston rod 9 is 0.1sec
If the pantograph mechanism 14 has a stroke amplification force of 10 times, the ram 6 will descend 1 m in the same 0.1 sec, so the descending speed of the ram 6 will also be the same as the piston rod. Therefore, even if the operating speed of the hydraulic cylinder 8 is relatively low, the ram 6 exerts a powerful striking force.

〔effect〕

As detailed above, according to this invention, the movement and stroke of the hydraulic cylinder is increased by the pantograph mechanism, and the ram is lowered at twice the speed of the hydraulic cylinder to obtain a high striking force. This has the advantage of providing a link-type stamp hammer with an extremely simple structure and high forging capacity at low cost.

In particular, according to the present invention, the hydraulic cylinder is mounted on a frame, and a gate-shaped drive rod, into which the hydraulic cylinder is fitted astride, is attached to the upper end of the piston rod that projects upward, and both legs of the drive rod are attached. Since the pin near the upper end of the pantograph mechanism is connected to the lower end, it is possible to equip a long pantograph mechanism with excellent amplification function in a limited forging space. Therefore, there is no need to use a hydraulic cylinder that operates at high speeds and high strokes, and the hydraulic unit only needs to be one that switches the hydraulic pressure supply to the hydraulic cylinder. Since there is no need for a high-performance hydraulic unit that provides high performance, it is possible to provide a more economical link type stamp hammer.

In addition, by replacing the pantograph mechanism, it is easy to change the striking speed of the ram and adjust the downward stroke, which is practical.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG. 1 is a front view of a link type stamp hammer, and FIG. 2 is a partially cutaway side view of the same link type stamp hammer. 1... Frame type frame, 2... Forging space, 4...
Lower die, 6... Ram, 7... Upper die, 8... Hydraulic cylinder, 9... Piston rod, 10... Drive rod,
14...Pantograph mechanism.

Claims (1)

[Scope of utility model registration request] A lower mold 4 is fixed in a forging space 2 formed inside the frame 1, and an upper mold 7 facing the lower mold is attached to a ram 6 that is guided and driven up and down in the forging space, and the ram is lowered. This is a stamp hammer for performing stamping and forging by a method, in which a hydraulic cylinder 8 is mounted on the top of the frame 1, and a piston rod 9 that protrudes upward from the hydraulic cylinder and moves back and forth is fitted over the upper end of the hydraulic cylinder. A gate-shaped drive rod 10 is attached, and both legs 10 of the drive rod are attached.
At the lower end of the pantograph mechanism 14, a pin 19 is attached at the lower part of the pivot point of the pantograph mechanism 14, which is equipped so that it can extend and contract in the vertical direction by pivoting the upper end into the forging space 2 on the upper bracket 13 of the frame type frame 1. A link type stamp hammer characterized in that the ram 6 is connected to the pantograph mechanism and the ram 6 is suspended from the lower end of the pantograph mechanism.