JP2004090301A - Method for controlling taking-up of strip-like rubber material from injection molding machine and tire molding system equipped with injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling the taking-up of a strip-like rubber material from an injection molding machine, capable of suppressing the fluctuations of the width of the strip-like material when the strip-like material is taken up by a tire molding drum to stably wind the strip-like material around the tire molding drum while uniformizing the shape and weight of the strip-like material. <P>SOLUTION: In the method for controlling the taking-up of the strip-like material W, which is extruded from the injection molding machine 3 continuously and winded around the tire molding drum 1, or the tire molding system equipped with the injection molding machine, the width B of the strip-like rubber material W extruded from the injection molding machine 3 is measured by the width sensor 6 arranged between the discharge port of the injection molding machine 3 and the tire molding drum 1 and a drum winding speed Vp is controlled so as to be adjusted corresponding to a change in the measured width Bm. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for controlling the winding of a belt-shaped rubber material from an injection molding machine and a tire molding system provided with the injection molding machine. For controlling winding of a band-shaped rubber material from an injection molding machine and a tire molding system capable of stably winding the band-shaped rubber material made of an elastic material while suppressing width fluctuation at the time of winding the band-shaped rubber material About.
[0002]
[Prior art]
In the manufacture of tires, an unvulcanized band-shaped rubber material (strip rubber) is continuously extruded and supplied from an injection molding machine (injection), and the band-shaped rubber material is wound around a tire forming drum. The tire components such as cap tread, under tread, side tread, and rim cushion rubber are directly molded to increase tire production efficiency, save space, and reduce production cost.
[0003]
In these tire forming methods, in order to manufacture the weight and shape of the tire constituent member with high accuracy, the surface speed of the tire forming drum is made to coincide with the injection speed of the belt-shaped rubber material extruded by the injection molding machine at the time of winding. In this way, synchronous control is performed, and winding is performed with uniform tension (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP 2001-72335 A (page 2)
[0005]
[Problems to be solved by the invention]
However, when the belt-shaped rubber material discharged from the injection molding machine is wound around a tire building drum, the discharge speed of the band-shaped rubber material and the rotation speed of the tire building drum are not proportional to each other, and the extruded band-shaped rubber material is May pulsate, and the width of the belt-shaped rubber material may fluctuate.
[0006]
This fluctuation in the width is particularly caused by the fact that the plunger speed and the discharge speed of the belt-like rubber material are not equal until the plunger (piston) speed of the injection molding machine reaches the top speed by repeating acceleration, constant speed, and acceleration. This is remarkable because during acceleration / deceleration, the width fluctuation is avoided by PID control, so that it is remarkable at a constant speed.
[0007]
Since the magnitude of this width fluctuation and the presence / absence of occurrence vary depending on the size and composition (compound) of the belt-shaped rubber material, it is difficult to grasp the characteristics in advance and set the winding so as not to cause this width fluctuation. However, in the prior art, in controlling the winding on the tire forming drum, priority has been given to not cutting the belt-shaped rubber material, so that a slight width variation has been allowed.
[0008]
However, if the width of the band-shaped rubber material fluctuates, the tire performance, particularly the uniformity, deteriorates. Therefore, control for suppressing the width fluctuation of the band-shaped rubber material has been required.
[0009]
An object of the present invention is to suppress the fluctuation of the width of the band-shaped rubber material by measuring the width of the band-shaped rubber material when winding the belt-shaped rubber material on the tire-forming drum and controlling the rotation of the tire forming drum in accordance with the width. Then, a method for controlling the winding of the band-shaped rubber material from the injection molding machine, which can stably stabilize the band-shaped rubber material, uniformize the shape and weight, and accurately wind the belt-shaped rubber material around the tire forming drum, and a tire molding system including the injection molding machine. To provide.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a method for controlling the winding of a band-shaped rubber material from an injection molding machine is a method for controlling the winding of a band-shaped rubber material that is continuously extruded from an injection molding machine around a tire forming drum. The width of the rubber band extruded from the injection molding machine is measured by a width sensor disposed between the discharge port of the injection molding machine and the tire molding drum, and the width of the drum is changed according to the change in the measured width. It is characterized by performing control for adjusting the winding speed.
[0011]
According to this method, the drum winding speed, that is, the rotational speed of the tire forming drum, is adjusted in a direction to suppress the fluctuation of the width in response to the fluctuation of the width of the rubber band extruded from the injection molding machine, and Because the material can be wound around the tire building drum, regardless of the size, type, physical properties and injection capacity of the band-shaped rubber material, the width variation of the band-shaped rubber material is suppressed, and the shape and weight are stabilized on the tire building drum. And can be wound accurately. Therefore, the profile of the tire can be kept constant, which helps to improve the uniformity.
[0012]
In the present invention, when the measured width of the belt-shaped rubber material becomes narrower than a predetermined width, the drum winding speed is reduced, and when the measured width of the belt-shaped rubber material returns to the predetermined width, the drum winding speed is set to a predetermined value. Control for returning to the speed is performed.
[0013]
As this control, when the detection width of the width sensor becomes equal to or smaller than a predetermined width, there is a control for decelerating to a predetermined rotation speed for a predetermined time, and when this control is performed, It is preferable that the number of times of control for decelerating to the predetermined rotational speed be calculated only during the predetermined time, and the control for extending the winding time be performed for a time corresponding to the number of times of deceleration.
[0014]
As the control of the drum winding speed, besides the above-described control, a feedback control for controlling the width of the belt-shaped rubber material as a control amount, a predetermined width of the belt-shaped rubber material as a target value, and the drum winding speed as an operation amount can be used. In this feedback control, any one or a combination of PID (proportional-integral-derivative) controls can be used, and the deviation amount of the drum winding speed from a predetermined set speed other than the feedback control is: Control for adjusting the width of the rubber band material so as to be proportional to the deviation between the measured width and the predetermined width, and control for adjusting the drum winding speed so as to be proportional to the measured width of the rubber band material. And so on.
[0015]
In these controls, the winding length is cumulatively calculated based on the measured value of the drum winding speed or the command value of the drum winding speed, and the length of the belt-shaped rubber material at the end of winding is set to a predetermined length. It is configured to perform control.
[0016]
By these controls, a tire having a uniform shape and weight on the periphery can be formed.
[0017]
A tire molding system including an injection molding machine for performing the method for controlling the winding of the belt-shaped rubber material from the injection molding machine described above includes an injection molding machine that continuously extrudes the belt-shaped rubber material, A tire forming system comprising: a tire forming drum on which the extruded material to be extruded is wound; and a control device for controlling the injection molding machine and the tire forming drum, wherein the control device includes the injection molding machine and the tire forming device. A detection value of a width sensor provided between the drums is input, and when the detection value is smaller than a first predetermined determination value, control is performed to reduce the drum winding speed; When the value returns to the predetermined value, control is performed to return the drum winding speed to a predetermined set speed, and when the detected value is larger than the first determination value, control is performed to increase the drum winding speed. It is configured as characterized.
[0018]
In the tire molding system equipped with this injection molding machine, the width of the band-shaped rubber material is measured by the width sensor, and the rotation of the tire molding drum is controlled using the detected width. Since the drum winding speed can be adjusted in the direction to suppress the fluctuation of the width according to the size, regardless of the size, type, physical properties and injection capacity of the band-shaped rubber material, the shape and weight of the band-shaped rubber material are made uniform and the tire forming drum can be accurately formed. Can be wound.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0020]
As shown in FIG. 1, a tire molding system 10 including an injection molding machine for implementing a method for controlling the winding of a band-shaped rubber material from the injection molding machine injects a tire molding drum 1 and a band-shaped rubber material W. It comprises an injection molding machine 3 and a control device (servo controller) 4 having a control circuit.
[0021]
Further, a slackness sensor 5 formed of a non-contact type displacement detection sensor for detecting a slackness amount of the belt-shaped rubber material W is disposed in a head portion of the injection molding machine 3, and a discharge port 3a of the injection molding machine 3 and a tire molding. The slack amount Dm between the drum and the drum 1 is detected and output to the control device 4.
[0022]
When the injection speed Vp for the molding operation is set and input, the control device 4 controls the plunger speed V of the injection molding machine 3 to be the injection speed Vp. That is, the plunger speed V is detected by a plunger speed measuring device (not shown) formed by an encoder or the like, and the detection signal Vm is received by the control device 4 so that the plunger speed V is fed back to the injection speed Vp. Control.
[0023]
Further, in the present invention, a width sensor 6 is further provided between the discharge port 3a of the injection molding machine 3 and the tire building drum 1, and the band-shaped rubber extruded from the injection molding machine 3 by the width sensor 6. The width B of the material W is measured from the start to the end of extrusion, and control is performed to adjust the drum winding speed VR according to the change in the measured width Bm. That is, the controller 4 calculates the target value Rp of the drum rotation speed R from the injection speed Vp obtained from the slack amount Dm and the measured width Bm.
[0024]
The signal of the drum rotation speed Rp is input to the servo drive motor 2 for driving the tire building drum 1, and rotates the tire building drum 1 at the drum rotation speed Rp.
[0025]
Further, a traverse device (not shown) in which the injection molding machine 3 is installed is driven by a traverse drive motor (not shown) based on the signal of the drum rotation speed Rp, and the injection molding machine 3 is moved to the width of the tire molding drum 1. Reciprocally at a speed synchronized with the drum rotation speed Rp.
[0026]
That is, based on the set injection speed Vp, the plunger speed V of the injection molding machine 3 is controlled, and the tire forming drum 1 adjusts the slack amount Dm detected by the slack sensor 5, the injection speed Vp, and the detection width. The rotation is controlled at a drum rotation speed Rp calculated from Bm. At the same time, the injection molding machine 3 is controlled to reciprocate in the width direction of the tire building drum 1 in synchronization with the drum rotation speed Rp.
[0027]
By these controls, the belt-shaped rubber material W extruded from the injection molding machine 3 is wound around the tire forming drum 1 after being sandwiched between the sub-roller 1a, the pressing roller 1b, and the tire forming drum 1.
[0028]
Next, a method for controlling the winding of the belt-shaped rubber material from the injection molding machine in the tire molding system 10 will be described with reference to a time series diagram shown in FIG.
[0029]
With respect to the belt-shaped rubber material W to be injected from the injection molding machine 3 in the tire molding system 10, the injection conditions and the injection state are previously studied by experiments and the like for each type, physical property and injection volume of the belt-shaped rubber material W. The optimum acceleration time tp1 for the injection speed Vp of the plunger and the optimum acceleration time td1 for the rotation speed Rp of the tire forming drum 1 are set for the type, physical properties and injection capacity of the belt-shaped rubber material W. The slack amount D1 is stored as a database.
[0030]
Then, when the type, physical properties and injection capacity of the belt-shaped rubber material W are determined, the injection speed Vp of the plunger, its acceleration target curve (master curve), the rotation speed Rp of the tire building drum 1 and its speed are determined from the stored database. Set the acceleration target curve (master curve).
[0031]
The injection speed Vp of the plunger is accelerated in accordance with the acceleration target curve, reaches an injection speed Vpp which is a constant speed portion in an acceleration region, and when the constant speed portion ends, is further accelerated to reach a final top speed Vpm. I do. In the present invention, the main focus of the present invention is on the rotation control of the tire building drum 1, and therefore detailed description of the control of the plunger of the injection molding machine 3 will be omitted.
[0032]
On the other hand, in the present invention, the drum winding speed VR is controlled based on the slack amount Dm detected by the slack sensor 5, but in this embodiment, the drum winding speed VR (R) is controlled by controlling the rotation speed Rp of the tire forming drum 1. = R x Rp, r: winding radius).
[0033]
Then, when the slack amount Dm detected by the slack sensor 5 reaches a predetermined slack amount Ds, the tire forming drum 1 starts rotating and starts winding the belt-shaped rubber material W. The drum winding speed VR (or the tire forming drum rotation speed R) is controlled so as to be accelerated according to the acceleration target curve and to be a predetermined set drum winding speed VRp (Rp) which is a constant speed portion in the acceleration region. After the drum winding speed VRp (Rp) reaches a predetermined value, the speed is basically controlled in synchronization with the injection speed Vpp of the plunger, which has become a constant speed. Is controlled in synchronism with the top speed Vpm of the plunger which has become constant.
[0034]
However, particularly during constant speed operation, depending on the type of compound, such as a large amount of silica, the band-shaped rubber material W pulsates and the width B fluctuates, so that the measured width Bm of the band-shaped rubber material W is reduced. When the width becomes smaller than a predetermined width (target width) Bs, the drum winding speed VR (R) is reduced, and when the width becomes larger than the predetermined width Bs, the drum winding speed VR (R) is increased. When the width has returned to the predetermined width Bs, control is performed to return the drum winding speed VR (R) to the predetermined drum winding speed VRp (Rp).
[0035]
The control of the drum winding speed VR, that is, the rotation speed R of the tire forming drum 1, is performed when the detection width Bm of the width sensor 6 becomes equal to or smaller than a predetermined width B1, that is, as shown in FIG. When the output voltage value E of No. 6 becomes equal to or more than the predetermined voltage value E1, control is performed to reduce the drum winding speed VR1 (R1) to a predetermined drum winding speed VR1 for a predetermined time tb1. That is, deceleration rotation is performed for a fixed time tb1 and a fixed amount ΔVR1. The values of the predetermined width Bs, the fixed time tb1, and the fixed amount ΔVR1 are obtained and set in advance by experiments, calculations, and the like, and input to the control device 4.
[0036]
The traverse drive motor (not shown) is driven in synchronization with the rotation speed R of the tire forming drum 1 to reciprocate the injection molding machine 3 in the width direction of the tire forming drum 1.
[0037]
Further, the number of times of deceleration for this fixed time and the fixed amount is calculated, and only the time corresponding to the number of times of deceleration, that is, the time obtained by multiplying the extended time for one deceleration (calculated in advance) by the number of times of deceleration. However, the winding time is extended only to calculate the time when the start end and the end become the same position in the circumferential direction, and when this time elapses, the band-shaped rubber material W is cut by a wire of a cutting device (not shown) to complete the processing. I do.
[0038]
At the time of this termination processing, for example, a gap is formed by separating the sub-roller 1a from the tire building drum 1, and a cutting device (not shown) is rotated along the outer peripheral portion of the sub-roller 1a, and the band-shaped rubber material W is cut by the wire of the cutting device. Disconnect. In addition, in order to prevent the cut end of the band-shaped rubber material W from being disturbed, the cut end of the band-shaped rubber material W is pressed against the tire forming drum 1 by a press roller (not shown), and a series of winding operations is stopped.
[0039]
By adjusting and controlling the drum winding speed VR and the rotation speed R according to the change in the measured width Bm, the fluctuation in the width B can be suppressed. One can be wound.
[0040]
The control of the drum winding speed VR, that is, the rotation speed R of the tire building drum 1 can be performed by the following control in addition to the above control.
[0041]
One such control is that the deviation amount (ΔRb = R−Rp) of the rotation speed R of the tire building drum 1 from the predetermined set rotation speed Rp is determined by the measured width Bm and the predetermined width Bs of the belt-shaped rubber material W. Is a control that adjusts in proportion to the deviation amount (ΔB = Bm−Bs), that is, a feedback control in which R = C1 × (Bm−Bs) + Rp.
[0042]
Another control is a control for adjusting the rotational speed R of the tire building drum 1 so as to be proportional to the measured width Bm of the belt-shaped rubber material, that is, a control for setting R = C2 × Bm.
[0043]
Alternatively, the rotation speed Rm of the tire forming drum 1 with respect to the measurement width Bm set in a stepwise manner is determined and input in advance, and the rotation speed Rm is selected or calculated from the actually measured width Bm. May be controlled.
[0044]
In the case of this control, the rotational speed R (measured value Rm or command value Rp) of the tire building drum 1 is cumulatively calculated to obtain a predetermined rotation amount LRs, that is, a predetermined rotation of one to several rotations. When the belt is rotated by several LRs and the start end and the end are at the same position, the band-shaped rubber material W is cut by a wire of a cutting device (not shown) and the end process is performed.
[0045]
That is, the winding length L (= r × LR) is cumulatively calculated based on the measured value VRm of the drum winding speed or the command value VRp of the drum winding speed, and the length L at the time when the winding of the belt-shaped rubber material W is completed is determined. Is controlled to have the length Ls (= r × LRs).
[0046]
【The invention's effect】
As described above, according to the method of controlling winding of the belt-shaped rubber material from the injection molding machine of the present invention and the tire molding system including the injection molding machine, the gap between the discharge port of the injection molding machine and the tire molding drum is provided. The width sensor provided measures the width of the extruded band rubber material and controls the drum winding speed in accordance with the change in the measured width. Therefore, the band rubber material extruded from the injection molding machine is controlled. The belt-shaped rubber material can be wound around the tire building drum while adjusting the drum winding speed, that is, the rotation speed of the tire building drum, in a direction in which the width fluctuation is suppressed in response to the width fluctuation.
[0047]
Therefore, irrespective of the size, type, physical properties and injection capacity of the belt-shaped rubber material, fluctuations in the width of the belt-shaped rubber material can be suppressed, and the shape and weight can be stably and uniformly formed on the tire forming drum, and can be accurately wound. . Therefore, the profile of the tire can be kept constant, which helps to improve the uniformity.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a tire molding system including an injection molding machine according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example of a time series of a drum winding speed based on a control method according to the embodiment of the present invention.
FIG. 3 is a view showing the appearance of a width detecting device for a belt-shaped rubber material.
FIG. 4 is a diagram showing the relationship between the width of a belt-shaped rubber material and the output of a width detection device.
FIG. 5 is a diagram showing an initial winding state in a tire molding system including a conventional injection molding machine.
FIG. 6 is a diagram illustrating a winding state in a tire molding system including the injection molding machine of FIG. 5;
FIG. 7 is a diagram showing a state of fluctuation of the width of the belt-shaped rubber material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tire forming drum 2 Servo drive motor 3 Injection molding machine 4 Control device (servo controller)
Reference Signs List 5 Looseness sensor 6 Width sensor 10 Tire molding system B equipped with injection molding machine Width of belt-shaped rubber material Bm Measured width Bs Predetermined width (target width)
Dm Slack displacement R, Rp Number of rotations of tire forming drum VR, VRp Drum winding speed W Strip rubber material

Claims (5)

In a band-shaped rubber material winding control method in which a band-shaped rubber material continuously extruded from an injection molding machine is wound around a tire forming drum, a width sensor disposed between a discharge port of the injection molding machine and the tire forming drum. A method for controlling the winding of the band-shaped rubber material from the injection molding machine, wherein the width of the band-shaped rubber material extruded from the injection molding machine is measured and the drum winding speed is adjusted according to the change in the measured width. When the measured width of the belt-shaped rubber material is narrower than a predetermined width, the drum winding speed is reduced, and when the measured width returns to the predetermined width, control is performed to return the drum winding speed to a predetermined set speed. A method for controlling winding of a belt-shaped rubber material from an injection molding machine according to claim 1. 3. The winding of the belt-shaped rubber material from the injection molding machine according to claim 2, wherein when the detection width of the width sensor becomes equal to or less than a predetermined width, control is performed to reduce the rotation speed to a predetermined rotation speed for a predetermined time. Control method. 4. A belt-shaped injection molding machine according to claim 3, wherein the number of times of control for decelerating to a predetermined rotational speed is calculated only during the predetermined time, and the control for extending the winding time is performed for a time corresponding to the number of times of deceleration. Rubber material winding control method. A tire comprising: an injection molding machine for continuously extruding a belt-shaped rubber material; a tire molding drum for winding the product extruded from the injection molding machine; and a control device for controlling the injection molding machine and the tire molding drum. In the molding system, the control device inputs a detection value of a width sensor provided between the injection molding machine and the tire molding drum, and the detection value is smaller than a predetermined first determination value. Control to reduce the drum winding speed, control to return the drum winding speed to a predetermined set speed when the detection value returns to the first determination value, and the detection value to be larger than the first determination value. A tire molding system equipped with an injection molding machine that performs control to increase the drum winding speed in the event that this occurs.

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