JPH0825068B2 - Press equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable bolster transfer mechanism and a clamping pressure generating mechanism in a press machine.

[0002]

2. Description of the Related Art As a known press device having a conventional mold clamping pressure generating mechanism and a movable bolster transfer mechanism, for example, in a hydraulic press device, hydraulic oil is used. There are problems such as environmental pollution, troubles due to contamination, and circuit mechanism due to complicated control valves. In the mechanical press device, for example, a mechanism using a ball screw or a trapezoidal screw for a movable bolster transfer and a mold clamping pressure increasing mechanism is known. However, two power transmissions for a movable bolster transfer and a mold clamping pressure increasing mechanism are known. Since it is necessary to install the systems in series, the structure is complicated, and in order to obtain a high pressing pressure, the same press load is applied to the two power transmission systems. There is a problem that the shaft and the structural material that receives the reaction force of the press must be thick and large, and the size must be increased.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a press device which is small in size, has a simple structure, is easy to maintain and has little work environment pollution. And

[0004]

[Means for Solving the Problems] For the above purpose,
In the present invention, "a movable bolster transfer mechanism that transfers a movable bolster by screw feed" and "a form-locking mechanism using a finite lead pressure generating mechanism by combining a bell cam shape on the upper part of the generator and a bell cam shape on the lower part of the receiver"
And the reaction force of the movable bolster transfer and the reaction force of the mold clamping generated when the two mechanisms operate respectively act in parallel on the housing 5 that receives these reaction forces. Is used.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic configuration diagram of a pressing apparatus according to the present invention. The movable bolster 4 is vertically movably mounted on a plurality of columns 3, 3 ... which are supported and fitted between the press table 1 and the fixed bolster 2, and are fixed to the lower surface of the press table 1 to perform transfer and pressure increase. It is fastened to a transfer rod 6 protruding from a housing 5 of the unit, and is configured to perform high-speed vertical movement by a transfer electric motor 7 and perform mold clamping and pressure increase by a pressure increasing electric motor 8. A press die 9 is mounted between the fixed bolster 2 and the movable bolster 4. The press table 1 is supported and fixed on the machine frame 10.

The details of the transfer and pressure boosting mechanism, which is the main component of the present invention, will be described below. 2 shows the housing 5
FIG. 3 is a partial sectional view of the housing 5, and FIG. 3 is a complete sectional view of the housing 5 and its internal mechanism. 2 and 3, the fastening elements and electric motors of the respective constituent elements are omitted.

A screw 13, which is arranged below the housing 5 so as to be rotatable by an angular ball bearing 12 and to support a load in the thrust direction, transmits a rotational power of a transfer electric motor 7 by a gear 14 to rotate the transfer rod 6. The transfer rod 6 is moved up and down at a high speed by the female screw cut into two. The lower outer surface of the transfer rod 6 is a spline shaft, and is vertically movably fitted to a spline receiver provided on the inner surface of the receiver 16 (see FIG. 5), and the upper portion is fastened to the movable bolster 4.

The generator 15 is rotatably fitted to the housing 5 by a plurality of balls 17 and bearings 18, and has an upper portion in a bell cam-like ball race shape having a finite fixed lead. Also the generator 15
The lower part is integrally fastened with the ring gear 20, and is rotated by the rotational power of the pressure boosting electric motor 8 via the gears 19 ...

The receiver 16 has a bell cam-shaped ball race-shaped portion having a finite fixed lead in the lower part thereof, and is combined with the bell cam-shaped ball race-shaped portion provided on the above-mentioned generator 15 via the ball 11. To be done.

Therefore, when the pressure boosting electric motor 8 is started, the generator 15 is rotated, and the receiver 16 is raised by the combination of the bell cams respectively provided between the generator 15 and the receiver 16, or is lowered by the reverse rotation. .

Further, the receiver 16 includes a housing 5, a ball 17, a generator 15, a ball, a spring receiver 22 and a plurality of springs 23, which are rotatably fitted to the press table 1 via a bearing 21. Preload is applied so that no gap is generated between each of 11 ...

Next, the operation of the pressing device according to the present invention will be described with reference to the drawings. As an initial state, the spline of the receiver 16 is stopped at a position where the spline of the transfer rod 6 can move up and down. First, the transfer electric motor 7
The screw 13 is rotated by the start of, and the movable bolster 4 and the press die 9 together with the transfer rod 6 are raised to the die clamping pressure increasing start position and stopped. (See FIG. 4) In this state, the male spline of the transfer rod 6 is located above the female spline of the receiver 16.

Next, the receiver rotating electric motor 24 is started,
The receiver 16 is rotated and stopped at a position where the upper surface of the spline of the receiver 16 comes into surface contact with the lower surface of the spline of the transfer rod 6. (See FIG. 6) Next, when the pressure boosting electric motor 8 is started and the generator 15 is rotated, the receiver 1 is rotated by the bell cam-shaped finite lead provided between the receiver 16 and the receiver 16.
6 is a thrust force to raise the receiver 6 and the transfer rod 6 together, and a desired clamping pressure is obtained.

When the pressure is increased and the form is clamped as described above, the press pressure is viewed from the press table 1 as a reference.
→ ball 17 → generator 15 → ball 11 → receiver 16 → transfer rod 6 → movable bolster 4 will be connected. At this time, a force to rotate the screw 13 works as the transfer rod 6 rises, but this is because the transfer electric motor 7 is already in a free state with the power supply stopped, and is only dragged to rotate a little.

Therefore, the screw 13 and the angular ball bearing 12 are strong enough to withstand the reaction force when the total weight of the transfer rod 6, the movable bolster 4, and the mold on the movable bolster is raised (transferred). It suffices to compare this with a screw shaft of a power transmission system for moving a movable bolster in a conventional mechanical pressing device using a ball screw or a trapezoidal screw, and a screw shaft which is thin and small in strength is sufficient in time.

[0015]

The effects obtained by the present invention will be briefly described as follows. It has a "movable bolster transfer mechanism for transferring a movable bolster by screw feed" and a "form clamping mechanism using a finite lead pressure generating mechanism by combining a bell cam shape above the generator 15 and a bell cam shape below the receiver 16", and The reaction force of the movable bolster transfer and the reaction force of the mold clamping, which are generated when the two mechanisms operate respectively, are configured to act in parallel on the housing 5 receiving the reaction forces. By using the press device, the problems of the conventional hydraulic press device, such as working environment pollution due to hydraulic oil leak, troubles due to contamination, and circuit mechanism due to complicated control valve, were completely eliminated. . In addition, the same press load is applied to the two power transmission system systems, one for moving the movable bolster and the other for boosting the mold clamping, which has been a problem in the conventional mechanical pressing device using a ball screw or a trapezoidal screw. All the problems that the power transmission system had to thicken each screw shaft and inevitably made it larger were solved. Summarizing the above effects, it is possible to obtain a press device that has a small work environment, is free from troubles due to contamination of hydraulic oil, has a small and simple structure, and is easy to maintain.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the embodiment, and its constituent elements do not deviate from the gist of the invention. It goes without saying that various changes can be made within the range. For example, in the above embodiment, gears are used for power transmission of the transfer motor 7, the pressure increasing motor 8, and the receiver rotating motor 24, but these may be changed to belts or chains, or each motor may be changed. Can be changed to an actuator such as an air cylinder, or the contact surfaces of the ball pressure-receiving portions of the housing 5, the generator 15 and the receiver 16 and the receiver 16 and the transfer rod 6 can be divided into the respective bodies and the same effect can be obtained. Can be obtained. The same applies when the balls 17 ..., 11 ... Are replaced with rollers.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a press device which is a utilization division of the present invention.

FIG. 2 is a sectional view of a housing of a transfer unit, which is a main component of the present invention.

FIG. 3 is a full sectional view of a transfer unit.

FIG. 4 is a full sectional view of a transfer unit.

FIG. 5 Explanatory diagram of spline

FIG. 6 Explanatory diagram of spline

[Description of sign]

 1, press stand 2, fixed bolster 3, column 4, movable bolster 5, housing 6, transfer rod 7, transfer electric motor 8, pressure boosting electric motor 9, press die 10, machine frame 11, ball 12, angular ball bearing 13 , Screw 14, gear 15, generator 16, receiver 17, ball 18, bearing 19, gear 20, ring gear 21, bearing 22, spring receiver 23, spring 24, receiver rotation electric motor 25, gear 26, ring gear

Claims (1)

[Claims] 1. A form clamping mechanism using a finite lead pressure generating mechanism by combining a "movable bolster transfer mechanism for transferring a movable bolster by screw feed" and a "bell cam shape above the generator 15 and a bell cam shape below the receiver 16". And the reaction force of the movable bolster transfer and the reaction force of the mold clamping, which are generated when the two mechanisms operate, act in parallel on the housing 5 that receives these reaction forces. A press device characterized by the above.