JP2570236B2 - Die driving device in automatic press die changing system - Google Patents

Abstract

PURPOSE:To reduce the preparatory time of a die and to improve its positioning accuracy by providing a rack driving shaft having a guide rail under a common base and setting shock absorbers on both ends of the common base. CONSTITUTION:The common base 6 is provided to dies 1, 2 and the driving shaft 4 composed of a rack fitted with the guide rail 10 is arranged under the common base. The rack driving shaft 4 is driven by a motor 5 and a pinion 3 and the shock absorbers 7a, 7b are provided at both ends of the common base 6. Hereby, the driving shaft 4 moves the dies 1, 2 by the motor 5 at a high speed, the shock absorbers 7a, 7b absorb the energy in stopping the die and the stopping accuracy for the dies 1, 2 is improved drastically. Besides, the guide rail 10 reduces the frictional resistance of the driving shaft. Consequently, the set-up time of the die is reduced and the positioning accuracy is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a press die driving method for exchanging press dies and performing press working. Further, it is used as a method for driving a casting mold and a resin mold that require high-speed mold exchange.

(Prior Art) As a conventional technique according to the present invention, mold replacement is performed manually or by a pneumatic cylinder.

(Problems to be solved by the invention) However, the mold replacement with the conventional pneumatic cylinder is
About 40 minutes are required for replacement time. Also, the number of cylinders for driving the molds increases with the number of molds to be replaced, the cylinder structure and the mounting method become complicated, and the replacement time increases in proportion to the number of cylinders.

For this reason, it has not been possible to exchange multiple molds instantaneously in one press machine.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of driving a press die, which can perform high-speed and high-precision die exchange when performing press working for each process.

[Configuration of the invention]

(Means for Solving the Problems) The technical means taken to solve the above technical problems are as follows. That is, in an automatic press die changing system that moves a plurality of dies by providing a common base movably on a bolster of a press machine, a drive shaft composed of a rack is provided below the common base, and the drive shaft is To move the drive shaft and the lower side of the mold by means of the arranged motor and pinion, and to arrange a shock absorber having a positioning collar at both ends of the common base to reduce frictional resistance due to sliding of the mold and the common base. In addition, a guide rail is provided on the drive shaft, and a guide block is further provided on the common base.

(Operation) The drive shaft and the pinion, which consist of a rack provided on the lower side of the common base, can move the mold left and right at high speed by the rotation of the motor, and collide when the mold is stopped by the shock absorber provided on the common base. Absorb energy,
In addition, high-precision positioning can be performed by adjusting the positioning collar, the frictional resistance is greatly reduced by the guide rail of the drive shaft and the guide block of the common base, and the motor for moving the drive shaft can be downsized. .

(Embodiment) The embodiment of FIGS. 1 to 5 will be described below.

FIG. 1 is a plan view of this embodiment.
A press machine of 0 TON or more, and a press 21 for sending out a finished product 20 that has been subjected to press working to the press machine B is disposed.

Reference numerals 1 and 2 are molds, 3 is a pinion, 4 is a drive shaft composed of a rack, 5 is a motor, and 6 is a common base.

In FIG. 2, (a) is a plan view in which the mold 1 is located at the center of the press machine, and (b) is a side view thereof. (C) is a plan view in which the mold 2 has moved to the center of the press, and (d) is a side view thereof.

FIG. 3 shows a drive shaft 4 (rack) attached to the lower part of the dies 1 and 2, and reference numeral 3 denotes a pinion, which is moved by rotation of a motor.

Also, as shown in FIG. 2, the molds 1 and 2 on the common base 6 are moved by the drive shaft 4 and the connecting pin 19. Further, the molds 1 and 2 can be arbitrarily moved left and right by the forward and reverse rotation of the motor 5, and the high-speed mold exchange can be performed because of the motor driving by the rack and pinion method.

 Next, a method of stopping the mold will be described.

The mold is heavy, and interlocking energy is stored in the mold during high-speed movement of the mold. Therefore, when the mold is stopped, it is difficult to stop the mold without a considerable braking function.

For this purpose, as shown in FIG.
a, 7b are attached to both ends of the common base 6 of the molds 1 and 2.

Also, as shown in FIG. 5, a receiving block 8 for receiving the shock absorber is mounted on the press bolster, so that the kinetic energy of the mold can be absorbed and the stopping of the mold is facilitated.

 Next, a method of stopping the mold with high accuracy will be described.

As shown in FIG. 6, positioning collars 9 are attached to the distal ends of shock absorbers 7a and 7b provided at both ends of the common base.

With the positioning collar 9 and the receiving block 8 shown in FIG. 5, the stopping accuracy of the mold is greatly increased. Further, since the positioning collar 9 is a screw-in type, fine adjustment is possible and the stopping accuracy is ± 0.2. mm became possible.

Next, a method for reducing the drive motor capacity will be described.

As shown in FIG. 2, the dies 1 and 2 are moved by the movement of the drive shaft 4, and the sliding resistance of the drive shaft 4 affects the motor capacity. A guide rail 10 was mounted around the entire length of 4 as shown in FIG.

Further, a guide book 11 for supporting the guide rail 10 is provided on the press bolster 12, so that resistance due to friction of the drive shaft 4 can be suppressed.

As an example, the friction resistance before mounting the rail block is
18 kg x 0.2 = 3.6 kg (drive shaft 4 = 18 kg), with rail block (guide rail 10 = 14 kg) 32 kg x 0.002 =
It becomes 0.006kg and the driving force is reduced by about 3.5kg. Therefore, the motor can be downsized.

Also, regarding the miniaturization of the motor, the common base 6 shown in FIG.
As shown in FIG. 8, guide blocks 13 are attached to the four corners of the common base 6 to reduce the frictional resistance of the common base 6.
Guide rail 14 on the bolster in parallel with the sliding direction of
12 to reduce the frictional resistance of the common base.
For example, 300kg / without rail block
Type 2 x 2.0 = 300 kg with rail block attached
× 0.002 = 0.6 kg, which reduces the drive by almost 59 kg and reduces the size of the motor.

Next, prevention of the cylinder operation of the air hydraulic pressure of the motor when the mold is stopped will be described.

As shown in FIG. 9, the driving motor 5 is subject to the force to rotate despite the fact that the position of the mold has been determined by the positioning block 8 stopped by the shock absorber 7a as shown in FIG. A limit switch (LS) tapping block 15 is attached to both ends of the common base 6 and an LS 16 is further installed on the bolster 12. The rattling is used to turn off the motor and stop the rotation, thereby preventing the motor from running idle and prolonging the life of the motor.

In FIG. 9 (a), the mold 1 stops at the center of the press, the block 15 on the upper right of the common base 6 stops striking the right LS16, and the rotation stops at the center of the press (b). Block 15 shows the state where the motor rotation is stopped by hitting the left LS16.

The case where the mold is moved by two molds is described above, and the movement when the mold is four or more molds is shown in FIG.

(1) Pressing by the second die is finished (2) Receiving block 17 goes down (3) And dies 1 and 2 and 3 and 4 are simultaneously moved to the left (in this case, only the left positioning block goes up)
(4) The right positioning block 18 is also raised, and moves from the third die to the fourth die. Therefore, regardless of the number of dies, all the movements are possible according to the present driving method.

〔The invention's effect〕

 The present invention has the following effects.

The mold change time varies greatly depending on the conventional mechanism, and the latest one requires only about 1 minute from 40 minutes, but in this embodiment, it takes about 1.5 seconds. It is possible to arrange multiple molds on the machine, reduce the number of press machines, and maintain the positioning accuracy of the mold at ± 0.2 mm, which is about 3 mm in the past.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the entire mold movement according to the present embodiment, FIGS. 2A to 2D are explanatory views showing the mold moving process, and FIG. 3 is an explanatory view showing the relationship between the rack and the pinion. Fig. 4, Fig. 4 is a mounting diagram of the shock absorber, Figs. 5 (A) and 5 (B) are explanatory diagrams showing the die movement and mounting of the receiving block when the shock absorber is mounted, Fig. 6 is a mounting diagram of the positioning collar, (A) and (b) of FIG. 7 are drive rail mounting diagrams, and (a) and (b) of FIG. 8 are explanatory diagrams in which rails are mounted on a common base.
(A) and (b) of FIG. 9 show a limit switch mounting diagram, and FIG.
Fig. 10 is an explanatory view of mold replacement for 4 or more dies. 1,2 ... Mold, 3 ... Pinion, 4 ... Drive shaft consisting of rack, 5 ... Motor, 6 ... Common base, 7 ... Shock absorber, 8 ... Shock absorber receiving block, 9 ...
Positioning collar, 10… Guide rail for drive shaft, 12… Bolster, 19 …… Coupling pin.

Claims (1)

(57) [Claims] 1. A die driving device in an automatic press die changing system for movably providing a common base on a bolster of a press machine and moving a plurality of dies, comprising a rack below the common base. The drive shaft, the pinion and the motor are arranged, the lower mold of the mold is moved, and a shock absorber having a positioning collar is attached to both ends of the common base,
A die driving device in an automatic press die changing system, wherein a guide rail is mounted on the drive shaft and a guide rail is mounted on the common base.