JP2001270723A - Index table driving mechanism of glass press molding machine, and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an index table driving mechanism of a glass press molding machine capable of making an improvement in quality compatible with an improvement in productivity and a method for controlling the same. SOLUTION: This index table driving mechanism is composed of connecting a servo motor of positional control through a speed reducing mechanism or a speed reducer to a rotating shaft of an indexing table 7 so that indexing operations can be realized by control for changing the positional command every moment and the speed pattern and dividing number can be changed in the index table driving mechanism of the glass press molding machine having a constitution provided with plural metal molds 5 on the indexing table 7 and capable of charging a gob 3 into the metal molds 5 while making the indexing table 7 perform the indexing operations, press molding the gob 3 with a pressing cylinder 4 and taking out the molded product with a takeout 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an index table driving mechanism of a glass press forming machine used for producing glass products and a control method thereof.

[0002]

2. Description of the Related Art In general, glass dishes (tumblers, dishes,
BACKGROUND ART A glass press forming machine used for production of various kinds of glass products such as a pot, an ashtray, a vase, a glass meter cover, and a glass plate is known. In this type, a rotatable index table is provided, and a plurality of dies for forming glass products are mounted on the same circumference of the index table at substantially equal intervals.

In this type of index table, the output of an index table driving motor (an inverter motor or a servo motor) is transmitted to a mechanical index mechanism such as a Geneva mechanism via a speed reduction mechanism or a speed reducer.
Generally, rotation drive control is performed via this mechanical index mechanism. When using an inverter motor,
For example, the stop position of the index table is determined using an angle sensor, and when a servomotor is used, the stop data of the index table is calculated by calling the position data of the built-in encoder.

[0004] Either continuous mode control or quick mode control is used to control each drive motor.

In the continuous mode control, as shown in FIG. 7A, for example, while the driving motor is continuously driven at a constant speed, the rotation speed of the index table is controlled as shown in FIG. 7B. However, in this continuous mode control, 1
Since the ratio of the feed time of the index table to the cycle time (the time required to mold one product calculated from the production speed) is determined by the mechanical index mechanism, it cannot be changed. There is. The production speed is represented by the number of products formed in a unit time. In glass press molding machines, it is customarily expressed as the number of products molded in one minute. In the continuous mode control, it is impossible to increase the time for forming a product by the press cylinder (that is, the time for stopping the index table) without changing the production speed.

To solve this problem, a quick mode control as shown in FIGS. 8A and 8B is proposed. In this quick mode control, the drive motor is operated intermittently at a constant cycle calculated from the production speed, and based on angle information from the angle sensor or the built-in encoder, the drive motor is stopped when the index is completed. In this quick mode control, the rotation speed of the drive motor can be changed regardless of the production speed, so that the ratio of the index feed time to one cycle time can be changed.

[0007]

However, the conventional configuration has the following problems.

In the above continuous mode control, when the production speed is changed, these do not collide with the index table without changing the cylinder timing setting associated with the index table such as anvil and kick-up. The ratio of the index sending time to one cycle time cannot be changed.

On the other hand, in the above-mentioned quick mode control, the ratio of the index feed time to one cycle time can be changed. However, when the production speed is changed, the timing setting such as anvil and kick-up attached to the index table is changed. Otherwise, they will collide with the index table. Each control mode has advantages and disadvantages, and is difficult to set and operate.

[0010] Some products have large parts such as a mold and a holder accompanying the mold, and the number of molds on the index table may be reduced from the standard number to produce. In this case, it is not necessary to stop the section where the mold is not mounted under the shear or the press cylinder. However, since the index number cannot be changed by the conventional mechanical index mechanism, useless stopping occurs when the mold is sent to the next process, and the productivity is reduced.

In the index when the gob, which is a lump of molten glass, is present in the mold, if the impact force or the centrifugal force due to acceleration / deceleration is large, the gob deforms or moves in the mold, thereby causing the press. Molding by cylinder does not work well.

However, when molding is performed with a smaller number of molds than the standard, there are cases where indexing is performed in a state where only molded products are present in the mold. In this case, even if a slight impact force or centrifugal force is applied, the quality is not affected.

In the conventional mechanical index mechanism, since the speed pattern is constant and cannot be changed, a speed pattern that minimizes the impact force and the centrifugal force due to acceleration / deceleration is adopted. Even if there is no gob inside, it is difficult to improve productivity because it can only be operated at this speed pattern.

Since the speed pattern is constant in the mechanical index mechanism, the maximum operation speed of the index table is determined by this speed pattern and the top speed of the driving motor. Regardless of continuous mode control or quick mode control, the index time when the drive motor is operated at the top speed is the shortest.To further shorten the index time, the mechanical index mechanism or the drive motor must be replaced. Must.

An object of the present invention is to provide an index table drive mechanism of a glass press molding machine and a control method therefor, which can solve the above-mentioned problems of the prior art and can achieve both improvement in quality and improvement in productivity. It is in.

[0016]

According to the first aspect of the present invention,
A plurality of dies are provided on an index table, and while the index table is operated as an index, a gob is put into the mold, the gob is press-formed, and an index table of a glass press forming machine having a configuration for take-out is provided. In the drive mechanism, a position control servomotor is connected to the rotation axis of the index table via a speed reduction mechanism or a speed reducer, and the index operation is realized by control for changing the position command instantaneously, so that the speed pattern and the speed The number of appearances is changeable.

According to a second aspect of the present invention, in the first aspect, the feed time of the index table can be changed in an arbitrary speed pattern in conjunction with the production speed.

The third aspect of the present invention is the first or second aspect.
In the above description, the speed pattern of the index table in the index operation can be changed depending on whether or not there is a gob in the mold on the index table.

According to a fourth aspect of the present invention, when the production speed is increased and the index time is shortened, the top speed of the servomotor is increased. When the servo motor reaches the maximum speed, the speed pattern is changed, and the index time is further shortened to increase the production speed.

According to a fifth aspect of the present invention, a plurality of dies are provided on an index table, and while the index table is operated as an index, a gob is put into the die, and the gob is press-formed and taken out. In the method for controlling an index table drive mechanism of a glass press molding machine having a configuration, a position control servomotor is connected to a rotation shaft of the index table via a speed reduction mechanism or a speed reducer, and the position command is changed every moment. The index operation is realized by controlling the speed pattern,
It is characterized in that the index number is changed.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a glass press forming machine. FIG.
In the figure, reference numeral 7 denotes an index table, and on the upper surface of the index table 7, 12 dies can be mounted on the same circumference at substantially equal intervals. Here, three molds 5 are mounted. As shown in FIG. 2, a speed reduction mechanism or a speed reducer 13 is connected to the rotating shaft 7A of the index table 7, and the speed reduction mechanism or the speed reducer 1 is used.
A servo motor (drive motor) 14 for position control is connected to 3.

An instantaneous current position command is sent from the control device 15 to the servo motor 14 for this position control, and an index operation is realized.

A glass melting furnace 1 (FIG. 1) is provided above the index table 7, and the molten glass flowing out of the glass melting furnace 1 is subjected to a shear (glass cutting device) 2
And a gob 3 (molten glass lump) is formed. The gob 3 falls and enters the mold 5. When the gob 3 enters the mold 5, the index table 7 is driven, and the mold 5 containing the gob 3 is moved below the press cylinder 4.

When the mold 5 containing the gob 3 moves below the press cylinder 4, the press cylinder 4 descends, the gob 3 is pressed, and the glass product 6 is formed. When the press cylinder 4 forms the product 6, the anvil 10 disposed immediately below the press cylinder 4 moves from the state of FIG.
As a result, the anvil 10 is raised and the index table 7 is supported from below.

At the same time that the gob 3 is formed into a glass product 6, the glass product 6
The glassware 6 is conveyed toward the takeout 8 by the rotation of the glassware 6, while the glassware 6 is cooled. When the glassware 6 in the mold 5 reaches the takeout 8, the glassware 6 is pushed up by the kickup 9, taken out by the takeout 8, and transported to the next process.

Glass press molding machines are used for the production of a wide variety of products such as glass tableware (tumblers, plates, bowls, etc.), ashtrays, vases, glass meter covers, glass plates and the like. The production speed and the number of molds to be used are also various, and it is possible to improve both quality and productivity based on these conditions.

In this embodiment, the index table 7
In the glass press forming machine having the above, the indexing number and the speed pattern of the index table 7 are controlled by software to achieve both improvement in quality and improvement in productivity.

As described above, the controller 15 sends the instantaneous current position command to the servomotor 14 to implement the index operation. Hereinafter, an algorithm for implementing the index operation by the software of the control device 15 will be described.

FIG. 3 is an explanatory diagram of this algorithm.

First, the dimensionless time is calculated (S
1). Assuming that the time of the index start timing is t0, the time of the index end is t1, and the current time is t, the dimensionless time T is defined as follows. Here, the dimensionless time T is a unitless number that is 0 at the start of the index and 1 at the end of the index.

[0032]

(Equation 1)

T0 and t1 are elapsed times from the reference timing, and are given as index schedule settings. By changing this, the ratio of the index time to one cycle time can be freely changed.

Next, a dimensionless displacement S is obtained using a dimensionless time-dimensionless displacement table (S2). The dimensionless displacement S is defined as follows, where τ0 is the index table position at the start of the index, τ1 is the index table position at the end of the index, and τ is the current position of the index table.

[0035]

(Equation 2)

The dimensionless displacement S is a unitless number that is 0 at the index start position and 1 at the index end position. τ0 and τ1 are given as index index number settings, and by changing these, the index numbers can be freely changed.

The dimensionless time-dimension displacement table is data of dimensionless displacement corresponding to dimensionless time, and gives a velocity pattern.

FIG. 4 is a conceptual diagram of a dimensionless time-dimensionless displacement table. By changing the dimensionless time-dimensionless displacement table, the speed pattern can be changed freely. By the software of the control device 15, for example, the process is switched according to the process (S3), and the dimensionless time
The dimensionless displacement S for an arbitrary dimensionless time is obtained by performing a polygonal line approximation with reference to the dimensionless displacement table 21.

In FIG. 4, it is assumed that Xn and Xn + 1 are dimensionless time data on the dimensionless time-dimensionless displacement table 21, and that Xn ≦ T ≦ Xn + 1 holds. The dimensionless displacement data corresponding to Xn and Xn + 1 is represented by Yn and Yn.
Let n + 1.

[0040]

(Equation 3)

In this manner, the dimensionless displacement S can be obtained by the polygonal line approximation with reference to the dimensionless time-dimensionless displacement table 21.

Next, the target position τ is obtained using the dimensionless displacement S (S4). The target position τ is obtained by transforming equation (2).

Τ = (τl−τo) S + τo (4) The target position τ is obtained by substituting Equation 3 into Equation 4.

The obtained target position τ is sent to the servo motor 14 (S5), and the position control of the servo motor 14 is executed.

By using this algorithm,
The index schedule number, index index setting, or switching of the dimensionless time-dimension displacement table 21 by the software of the control device 15 can freely change the index index number and the speed pattern.

In the present embodiment, first, a configuration is adopted in which the conventional mechanical index mechanism is eliminated and the index table 7 is directly driven by the position control servomotor 14 via the speed reduction mechanism or the speed reducer 12. You.

Then, an instantaneous current position command is sent from the control device 15 to the servomotor 14 to implement an index operation.

According to this, the conventional problem can be solved by making the index time and one cycle time proportional.

That is, in this control, even if the one cycle time (production speed) is changed, the ratio of the index time to the one cycle time is constant, so that the index table 7 such as the ampil 10 and the kick-up 9 is attached. Even if the timing setting of the cylinder to be changed is not performed, these will not collide with the index table 7. Further, unlike the conventional continuous mode control, the ratio of the index time to one cycle time can be freely changed.

As described above, the advantages of the continuous mode control and the quick mode control can be obtained, and the above-mentioned problem is solved.

Secondly, in the present embodiment, by selecting the optimum index number and speed pattern in each step of the glass press molding machine, the production can be performed even when the number of molds 5 is reduced. Thus, both improvement in quality and quality can be achieved, and the above problem can be solved.

FIG. 5 shows an example in which a total of three dies 5 are placed on the index table 7 at intervals of three.

In FIG. 5A, the molten glass flowing out of the glass melting furnace 1 is cut out by a shear 2 and the gob 3
Is formed, and the gob 3 falls and enters the mold 5. In this case, the index table 7 is stopped.

When the gob 3 enters the mold 5, the index table 7 performs a 300 index operation (= indexing number 12) as shown in FIG. Move down.

In this case, the gob 3 is a molten glass lump in a high-temperature state, and if the speed pattern of the index operation is inappropriate, the gob 3 is deformed or moved by centrifugal force or impact force, which causes quality deterioration. . Therefore, the speed pattern at this time is a speed pattern that gives priority to the reduction of the centrifugal force and the impact force (for example, the pattern a of the dimensionless time-dimension displacement table 21 in FIG. 3).
Etc. according to the modified sine curve M. ).

The mold 5 containing the gob 3 is a press cylinder 4
5c, the press cylinder 4 pushes down the gob 3 to form the glass product 6, as shown in FIG. 5c.
In this case, the index table 7 is stopped.

When the molding of the glass product 6 is completed, FIG.
As shown in (2), the index table 7 performs a 900 index operation (= indexing number 4), and the empty mold 5 is moved directly below the shear 2.

At this time, since the mold 5 contains a molded product or is empty, even if a slight centrifugal force or impact force is applied, the quality does not deteriorate. Therefore, the speed pattern at this time adopts a speed pattern of speed priority (for example, a curve N according to the pattern b of the dimensionless time-dimensionless displacement table 21 in FIG. 3), and speeds up the rotation to improve the productivity. Aim.

As described above, by changing the index number and the speed pattern during one cycle, it is possible to achieve both improvement in productivity and improvement in quality.

Further, in the present embodiment, thirdly, in order to solve the problem, the speed pattern is changed according to the index time.

Referring to FIG. 6, FIG. 6A shows a case where the index time is sufficiently long and the maximum speed at the time of index does not exceed the top speed of the servomotor 14. FIG. 6B illustrates a case where the maximum speed at the time of indexing reaches the top speed of the servomotor 14 because the indexing time is short.

In the conventional control, since the speed pattern cannot be changed, the index time cannot be further reduced.

FIG. 6C shows the case where the speed pattern is changed to the speed pattern with the speed priority and the index time is further shortened. In the present embodiment, by changing the speed pattern in accordance with the index time, the index time can be made shorter than in the conventional control.

As described above, the present invention has been described based on one embodiment, but it is apparent that the present invention is not limited to this.

In the present invention, mechanical energy loss can be reduced by eliminating the mechanical index mechanism, so that a higher-speed index can be obtained when the mechanical index mechanism is used.

[0066]

As described above, according to the present invention, it is possible to achieve both improvement in quality and improvement in productivity of a glass press molding machine.

[Brief description of the drawings]

FIG. 1A is an overall configuration diagram of a glass press molding machine, FIG. 1B is a perspective view showing a state after an anvil operation, and FIG. 1C is a perspective view showing a state before an anvil operation.

FIG. 2 is an explanatory diagram of an index table driving mechanism of the present invention.

FIG. 3 is an explanatory diagram of an algorithm for calculating a target position of an index table.

FIG. 4 is a conceptual diagram of a dimensionless time-dimensionless displacement table.

FIG. 5 is a diagram showing a production process by a glass press molding machine on which three dies are placed.

FIG. 6 is an explanatory diagram of control for switching a speed pattern according to an index time.

FIG. 7 is a diagram showing the relationship between the rotation speed of an index table and the rotation speed of a drive motor in conventional control.

FIG. 8 is a diagram showing the relationship between the rotation speed of an index table and the rotation speed of a driving motor in conventional control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass melting furnace 2 Shear 3 Gob (molten glass lump) 4 Press cylinder 5 Die 6 Glassware 7 Index table 8 Takeout 9 Kickup 10 Anvil 14 Servomotor 15 Control device

Claims (5)

[Claims] 1. A glass press having a configuration in which a plurality of dies are provided on an index table, a gob is put into the dies while the index table is operated as an index, and the gob is press-formed and taken out. In the index table drive mechanism of the molding machine, a position control servomotor is connected to the rotating shaft of the index table via a speed reduction mechanism or a speed reducer, and the index operation is realized by control for changing the position command every moment. An index table driving mechanism for a glass press molding machine, wherein the index pattern, the speed pattern, and the number of indexes can be changed. 2. The index table drive mechanism of a glass press molding machine according to claim 1, wherein the feed time of the index table can be changed in an arbitrary speed pattern in conjunction with the production speed. 3. The index pattern according to claim 1, wherein a speed pattern of the index table in the index operation can be changed depending on whether or not there is a gob in the mold on the index table. Index table drive mechanism of glass press molding machine. 4. When the production speed increases and the index time decreases, the top speed of the servomotor is increased, and when the servomotor reaches the maximum speed,
The index table drive mechanism of a glass press molding machine according to any one of claims 1 to 3, wherein a speed pattern is changed, and an index time is further shortened to increase a production speed. 5. A glass press having a configuration in which a plurality of dies are provided on an index table, a gob is put into the dies while the index table is operated for indexing, and the gob is press-formed and taken out. In a control method of an index table drive mechanism of a molding machine, a servomotor for position control is connected to a rotation shaft of the index table via a speed reduction mechanism or a speed reducer, and an index operation is performed by control to change its position command every moment. A method for controlling an index table drive mechanism of a glass press forming machine, wherein the method is implemented to change a speed pattern and the number of indexes.