JPH038879B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a mold positioning device in a press machine or the like.

BACKGROUND ART Conventionally, various types of mold positioning devices for press machines and the like have been known and are actually used.

FIG. 4 of the accompanying drawings schematically shows a die drive system using a hydraulic cylinder in a forging press, as an example of this type of known die positioning device. As shown in the figure, two mutually connected molds 3A and 3B are arranged on the upper surface of the bed 2 of the forging press 1.
These molds 3A and 3B are used to bring either mold A or mold 3B to the center position of bed 2.
One of them, for example, is connected to the mold 3B,
A mold moving carriage 4, which is disposed so as to be movable horizontally with respect to the bed 2, is connected to the free end of a piston rod 6 of a hydraulic cylinder 5, which has a longitudinal axis in the direction of movement. The movable trolley 4 is stopped at a predetermined position, and this stopping position is achieved by placing limit switches 7A and 7B fixedly arranged at predetermined positions, and actuating these by an actuator 8 attached to the mold moving trolley 4. The limit switch 7A or 7B returns the hydraulic switching valve 9, which controls the supply of pressure oil to the hydraulic cylinder 5, to a neutral position, thereby stopping the mold moving carriage 4 at a predetermined position.

As another example, as shown in FIG. 5, a vertical groove having a V-shaped cross section is formed approximately at the center of each longitudinal side surface of the press 1 of the mutually connected molds 3A or 3B. 15A or 15B are provided facing each other at a certain depth, and in these grooves 15A, 15B,
Positioning is performed by inserting dowel pins 21 each having a V-shaped protrusion in cross section corresponding to its tip, which are actuated by hydraulic cylinders 20 fixedly provided on both sides of the press 1. There is also.

Problems to be Solved by the Invention However, in the former positioning method, the weights of the molds 3A, 3B and the movable cart 4 are large, and the scale powder generated from the forging is Since the shearing resistance caused by entering the relative movement surface between the mold 3A and the mold 2 is also large, the stopping accuracy of the movable cart 4 is poor, and in order to accurately position the mold 3A or 3B relative to the center of the bed 2 , a so-called inching operation is required, which takes more or less time.

Therefore, in order to quickly and precisely stop the mold 3A or 3B at a predetermined position, a complicated position detection device and delicate speed control are required, but in a hot forging press, Due to scale powder, thermal effects, etc., it is extremely difficult to maintain the accuracy of the position detection device over a long period of time, even if delicate speed control is performed.

Furthermore, in the example shown in FIG. 4, the head side and piston rod side of the hydraulic cylinder 5 are closed off by relief valves 10 and 11 arranged in the hydraulic circuit thereto. The molds 3A and 3B are always held by a constant force. However, if the forging is eccentric from the center of the mold, for example, the forging cannot be processed. When pressed, an excessive horizontal load may act on the mold 3A, and as a result, a phenomenon may occur in which the mold 3A moves in the moving direction. Moreover, this phenomenon occurs quite frequently, and each time it occurs, the mold 3A must be returned to the center of the press, and accordingly, an inching operation is required frequently. Also, in the case of the example shown in FIG. 5, oil leakage at the relative moving part may occur due to scale powder or the like entering the gap between the relative moving part between the hydraulic cylinder 20 and the knock pin 21, or due to thermal effects. For this reason, it is difficult to use this positioning device accurately and stably over a long period of time.
The problem is that it is extremely difficult.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a new and improved device of this type that solves various drawbacks and problems in conventional mold positioning devices for press machines and the like.

Means for Solving the Problems In order to achieve this object, the present invention provides two metal presses connected to each other on a bed 20 of a press 10, etc., as shown in FIG. 1 of the accompanying drawings. Type 31
A, 31B are arranged, and these molds 31A, 31
In a device for selectively positioning one of B at the center position on the bed surface of a press machine, a mold moving cart 32 is placed on the bed ₂₀₁ horizontally in the direction of mold movement. Placed so that it can be moved freely,
A hydraulic moving cylinder 33 is fixed to the bed so that the mold moving carriage 32 can be freely connected to the mold, and has a longitudinal axis in the moving direction.
A hydraulic positioning sub-cylinder 3 is connected to the piston rod 34 ₁ of the hydraulic moving cylinder 33 and has a stroke smaller than the piston stroke but a larger output than its pulling force.
6 are fixed coaxially, and the piston rod 37 ₁ can pass through the head of the hydraulic moving cylinder 33 and come into contact with the head side of the piston 34 , and the piston rod 34 ₁ side of the hydraulic moving cylinder 33 In this case, a hydraulic positioning cylinder 50 is fixedly arranged on the bed of the press machine on the opposite side of the mold moving carriage 32 so that its longitudinal axis is in the direction of movement, and its piston stroke is made smaller than the stroke of the hydraulic moving cylinder 33. is also small, but its output is larger than the pushing force of the hydraulic moving cylinder 33, and the piston rod 51 ₁ of this hydraulic positioning cylinder 50 is
The end portion is characterized by a mold positioning device in a press machine or the like, which is capable of freely coming into contact with the mold moving carriage 32.

Embodiments Hereinafter, the present invention will be described in detail based on FIGS. 1, 2 and 3 of the accompanying drawings showing embodiments thereof.

First, FIGS. 1 and 2 show one embodiment of the present invention, and as shown in FIGS.
On the surface of the bed 20, molds 31A and 31B are interlocked and connected to each other via hooks at the lower portions of their opposing side walls so that the center distance is L1, and one Mold 31
B is a mold moving trolley that is disposed at the lower end of the other side wall on the bed ₂₀₁ frame lower than the bed 20 of the press machine 10 so as to be movable horizontally in the moving direction of the molds 31A and 31B. 32
A hook 32A provided at the opposite end of the
The molds 31A, 31 are interlocked and connected.
B is movable in the left and right directions on the bed 20 of the press 10 via the mold moving cart 32 as seen in the figure.

Similarly, this mold moving cart 32 is connected to the bed 20.
The piston rod 34 of a hydraulic moving cylinder 33 is fixed horizontally on the _top of the mold moving carriage 32 horizontally and coaxially with the moving direction of the mold moving carriage ₃₂ , and the end of the piston rod 34 is connected by a nut 35. It is made possible to move freely on the bed ₂₀₁ by the operation of the type moving cylinder 33.

Further, on the piston head side of this hydraulic moving cylinder 33, there is provided a piston with a total stroke L3 shorter than the total stroke L2 of the piston 34 of this hydraulic cylinder 33.
A hydraulic positioning sub-cylinder 36 is connected thereto, and its piston rod ₃₇₁ passes through the head cover of the hydraulic moving cylinder 33 and pushes the piston 34 to the left as seen in the figure. It is made possible to do so.

In this case, the pressure receiving area on the head pushing side of the piston 37 of the hydraulic positioning sub-cylinder 36 should be approximately 1.5 times larger than the pressure receiving area on the head pulling side of the piston 34 of the hydraulic moving cylinder 33.
Alternatively, the set pressure of the relief valve 40 installed in the hydraulic circuit for the hydraulic positioning sub-cylinder 36 is compared with the set pressure of the relief valve 41 installed in the hydraulic circuit for the hydraulic moving cylinder 33, Place it about 1.5 times higher. That is,
The piston 37 is stronger than the pulling force of the piston 33.
The pushing force shall be increased by approximately 1.5 times.

Furthermore, as shown in FIGS. 1 and 3, the bed 20
₁ has a bed 20 and a mold moving cart 32.
The hydraulic positioning cylinder 50 is sandwiched between the
is fixed coaxially with the hydraulic moving cylinder 33 and the hydraulic positioning sub-cylinder 36, but the total stroke L4 of the piston 51 is shorter than the total stroke L2 of the piston 34 of the hydraulic moving cylinder 33, Piston rod 51 ₁ of the piston 51
The free end of the mold moving carriage 32 is connected to the press 10.
so that the hydraulic positioning cylinder 50 can contact the end face facing toward the center of the piston 51, as shown in FIG.
When the entire stroke L4 is operated to the forward limit, the mold moving carriage 32 can be pushed rightward as seen in FIG. 3. In this case, the pressure receiving area on the head pushing side of the piston 51 of the hydraulic positioning cylinder 50 should be approximately 1.5 times larger than the pressure receiving area on the head pushing side of the hydraulic moving cylinder 33, or the hydraulic The set pressure of the relief valve 52 installed in the hydraulic circuit for the positioning cylinder 50 is set by the relief valve 42 installed in the hydraulic circuit for the hydraulic moving cylinder 33.
The pressure shall be approximately 1.5 times higher than the set pressure. In other words, the pushing force of the piston 51 of the hydraulic positioning cylinder 50 is approximately greater than the pushing force of the piston 34 of the hydraulic moving cylinder 33.
It shall be enlarged by 1.5 times.

Here, the total stroke L2, L of each piston 34, 37, 51 of each hydraulic cylinder 33, 36, 50
3. L4 and the center distance L between the molds 31A and 31B
The relationship between 1 and 1 is as follows. That is, it is assumed that the dimensions of each part are selected in advance so that the relationship L1=L2-L3-L4 holds between them.

In this way, the piston 37 of the hydraulic positioning sub-cylinder 36 is placed in a state where it is advanced through its entire stroke L3 to the forward limit through the operation of the switching valve 43 installed in the hydraulic circuit,
When the mold moving cart 32 is moved to the right as seen in FIG. 1 by actuation of a switching valve 44 installed in its hydraulic circuit, the piston 34
collides with the free end of the piston rod 37 ₁ of the hydraulic positioning sub-cylinder 36 and the mold moving carriage 32
is stopped at this position, and in this state, the mold 31A is placed on the bed 20 of the press 10 so as to be positioned at the center position XX.

Further, as shown in FIG. 3, the piston 51 of the hydraulic positioning cylinder 50 is advanced through its entire stroke L4 to its forward limit through the operation of the switching valve 53 installed in the hydraulic circuit. When the mold moving trolley 32 is moved to the left as seen in _FIG . collides with the free end,
The mold moving cart 32 is stopped at this position, and in this state, the mold 31B is moved to the press 1.
0 on the bed 20 so as to be positioned at the center position XX.

The positioning of the molds 31A or 31B in both of these cases is such that the pistons 37 or 51 of the hydraulic positioning sub-cylinder cylinder 36 or the hydraulic positioning cylinder 50 are in the forward movement range relative to the hydraulic cylinders 36 or 50. It is mechanically stopped by hydraulic cylinders 36 and 50. Therefore, the stop position of the mold moving carriage 32 through the piston 34 or by direct collision with these elements can be extremely accurately determined.

In this way, the press 10 of the molds 31A and 31B
The movement to the center position above the bed 20 is performed by each piston 37 or 51 of the hydraulic positioning sub-cylinder 36 or the hydraulic positioning cylinder 50.
This can be done accurately by simply moving the hydraulic cylinders 33 to the right or left by advancing them to their respective advancement limits and switching the switching valve 44.

Further, although a horizontal load may act on the mold 31A or 31B during forging work, the hydraulic positioning sub-cylinder 36 or the hydraulic positioning cylinder 5 must be operated up to a certain level of load.
Due to the action of relief valves 40 and 41 or 52 and 42 that close each port of
A or 31B is held stationary.

Further, for example, when the mold 31A is at the center position above the bed 20 of the press 10, a horizontal load acts to the right in the figure, and the relief valve 40
When the relief pressure exceeds , the mold moving cart 32
tends to be moved to the right, but in this case, the switching valves 44 and 43 that control the supply of hydraulic pressure to the mold movement cylinder 33 or the hydraulic positioning sub-cylinder 36 are switched to the hydraulic movement cylinder 3.
By switching the piston 34 of No. 3 and the piston 37 of the hydraulic positioning sub-cylinder 36 so that they press against each other, the moment the horizontal load in the right direction acting on the mold 31A is removed, The mold moving cart 32 is pushed back to the left through its entire stroke L3 to the forward limit by the action of the piston 37 of the hydraulic positioning sub-cylinder 36. That is, the mold 31A returns to the center position XX above the bed 20 of the press 10.

Conversely, when the mold 31A is pushed leftward and the relief pressure exceeds the relief valve 41 of the mold moving hydraulic cylinder 33, the piston 34 of the hydraulic mold moving cylinder 33 is pulled toward the mold 31A. The piston 34 is taut and similarly moves to the left, but at the moment the load is removed from the mold 31A, its piston 34 is pushed in and collides with the free end of the piston 37 ₁ of the piston 37 of the hydraulic positioning sub-cylinder 36 and stop. That is, the mold 31A returns to the central position above the bed 20 of the press 10.

Next, as shown in FIG. 3, the mold 31B is
When the press 10 is at the center position X-X above the bed 20, the horizontal load is applied during forging, as seen in FIG.
If the relief pressure exceeds the relief pressure of the relief valve 42 of the mold moving cylinder 33, the mold moving truck 32 tends to be moved to the right, but the mold moving hydraulic cylinder 33 or The switching valve 44 or 53 of the hydraulic positioning cylinder 50, the piston 34 of the mold moving hydraulic cylinder 33 and the piston 51 of the hydraulic positioning cylinder 50, the mold moving cart 32, the free end of the piston rod 511 of the piston ₅₁ . At the moment when the horizontal load is removed, the mold moving carriage wheel 32 is moved as shown in _FIG . Move the mold moving cart 32 to the left.
is pushed back until it collides with the free end of the piston rod 511 of the piston ₅₁ of the hydraulic positioning cylinder 50, and the mold 31B is pushed back into the bed 20 of the press 10.
It will return to the center position above.

Conversely, when the mold 31B is pushed to the left as seen in FIG. Re,
Although it moves to the left, the moment the load is removed, the piston 51 is pushed through its entire stroke L4 to its forward limit, and as a result, the mold moving carriage 32 is returned to its original position, and the mold 31B is The press 10 returns to the center position of the bed 20.

Effects of the Invention Since the present invention has the above-described configuration and operation, it is possible to perform inching operations without requiring a position detection device such as a limit switch or delicate speed control as in the conventional case. The mold of a forging press or the like can be quickly and accurately moved to the center position on the top surface of the press bed without the need for a hydraulic moving cylinder. However, since the stop position of the die is slightly inward from the stroke end of the hydraulic moving cylinder, excessive horizontal loads may be applied to the die during forging work. Even if the hydraulic moving cylinder escapes and the mold or equipment such as the moving cylinder is By switching the hydraulic switching valve, the mold will automatically return to the center position on the top of the press bed the moment the horizontal load is removed, and other excellent effects can be achieved. It is something.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, and FIG. 3 is a press machine shown in FIGS. 1 and 2. A schematic vertical sectional view showing the mold in another position, No. 4
The figure is a perspective view showing one example of a conventionally known positioning device such as a press machine, and FIG. 5 is a plan view of the main parts of another example. 10...Press machine, 20...Bed, 31...
Mold, 32... Mold moving trolley, 33... Hydraulic moving cylinder, 34... Hydraulic positioning sub-cylinder, 40, 41, 42, 52... Relief valve, 4
3, 44, 53...Switching valve, 50...Hydraulic positioning cylinder.

Claims (1)

[Claims] 1. Two molds connected to each other are arranged on the bed of a press, etc., and one of these molds is placed on the surface of the bed of the press, etc. In a device for selectively positioning a mold at a central position, a mold moving trolley is disposed on a bed so as to be horizontally movable in the moving direction of the mold, and this mold moving trolley can be freely connected to the mold. is connected to the piston rod of a hydraulic moving cylinder fixedly arranged on the bed so as to have a longitudinal axis in the direction of movement, and the head side of the hydraulic moving cylinder has a stroke smaller than the piston stroke, A hydraulic positioning sub-cylinder having an output greater than the pulling force is coaxially fixed, and its piston rod is capable of penetrating the head of the hydraulic moving cylinder and contacting the head side of the piston, and On the piston rod side of the cylinder, a hydraulic positioning cylinder is fixed to the bed of the press machine on the side opposite to the mold moving carriage, with its longitudinal axis in the direction of movement. It shall be smaller than the stroke, but its output shall be greater than the pushing force of the hydraulic moving cylinder,
A mold positioning device for a press machine or the like, characterized in that the end of the piston rod of the hydraulic positioning cylinder can freely come into contact with a mold moving carriage. 2 When the distance between the centers of two mutually connected molds is L1, the stroke of the hydraulic moving cylinder is L2, the stroke of the hydraulic positioning sub-cylinder is L3, and the stroke of the hydraulic positioning cylinder is L4, The positioning device according to claim 1, wherein the dimensions of each member are selected so that the relationship L1=L2-L4-L3 holds between these values. 3. A patent claim in which a switching valve is arranged in each hydraulic circuit to a hydraulic moving cylinder, a hydraulic positioning sub-cylinder, and a hydraulic positioning cylinder, and a relief valve is arranged in each hydraulic circuit. The positioning device according to range 1 or 2. 4 The relief pressure of each relief valve installed in the hydraulic circuit for the hydraulic positioning sub-cylinder and the hydraulic positioning cylinder is the relief pressure set for the relief valve installed in the hydraulic circuit for the hydraulic moving cylinder. 4. The positioning device according to claim 3, wherein each of the positions is set to be larger than the above.