JP4024111B2 - Method of controlling the winding of a belt-shaped rubber material from an injection molding machine and a tire molding system equipped with an injection molding machine - Google Patents

Description

[0001]
BACKGROUND 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 equipped with an injection molding machine. More specifically, the present invention relates to rubber or the like by means of controlling the rotational speed of a tire molding drum. Method for controlling the winding of a belt-shaped rubber material from an injection molding machine and a tire molding system equipped with an injection molding machine capable of stably winding while suppressing the width fluctuation at the time of winding the belt-shaped rubber material of an elastic material About.
[0002]
[Prior art]
In tire production, an unvulcanized belt-shaped rubber material (strip rubber) is continuously supplied by extrusion from an injection molding machine (injection), and the belt-shaped rubber material is wound around a tire molding drum, based on the laminated structure. In addition, tire components such as cap treads, under treads, side treads, and rim cushion rubbers are directly molded to increase tire manufacturing efficiency, save space, and reduce manufacturing costs.
[0003]
In these tire molding methods, in order to accurately manufacture the weight and shape of the tire component, the surface speed of the tire molding drum is matched with the injection speed of the strip rubber material extruded by the injection molding machine during winding. Thus, the synchronous control is performed and winding is performed with a 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 this injection molding machine is wound around the tire molding drum, the ejection speed of the belt-shaped rubber material and the rotational speed of the tire molding drum are not proportional to each other, and the extruded belt-shaped rubber material May pulsate and the width of the rubber band material may vary.
[0006]
This variation in width is particularly the same between the plunger speed and the discharge speed of the rubber band material until the plunger (piston) speed of the injection molding machine reaches the top speed by repeating acceleration, constant speed, and acceleration. This is remarkably because it will not be performed, and also during acceleration / deceleration, the width fluctuation is avoided by PID control, so it is remarkable at a constant speed.
[0007]
The magnitude of this width variation and the presence or absence of occurrence vary depending on the size and composition (compound) of the rubber band material, so it is difficult to grasp the characteristics in advance and make a winding setting that does not cause this width variation. In the prior art, in the control at the time of winding on the tire forming drum, priority has been given not to cut the belt-like rubber material, and thus some variation in width has been allowed.
[0008]
However, if fluctuation occurs in the width of the belt-shaped rubber material, tire performance, particularly uniformity, deteriorates, and thus it is necessary to control to suppress the width fluctuation of the belt-shaped rubber material.
[0009]
The object of the present invention is to measure the width of the belt-shaped rubber material when winding it on the tire molding drum, and control the rotation of the tire molding drum in accordance with this width, thereby suppressing the fluctuation of the width of the belt-shaped rubber material. A belt rubber material winding control method from an injection molding machine and a tire molding system equipped with an injection molding machine capable of stably winding the belt rubber material, uniforming the shape and weight and winding it around a tire molding drum with high accuracy. It is to provide.
[0010]
[Means for Solving the Problems]
The belt-shaped rubber material winding control method from the injection molding machine for achieving the above object is the belt-shaped rubber material winding control method in which the belt-shaped rubber material continuously extruded from the injection molding machine is wound around a tire molding drum. The width sensor disposed between the discharge port of the injection molding machine and the tire molding drum measures the width of the belt-shaped rubber material extruded from the injection molding machine, and the drum according to the change in the measured width. Control is performed to adjust the winding speed.
[0011]
By this method, the belt rubber is adjusted while adjusting the drum winding speed, that is, the rotation speed of the tire molding drum, in a direction to suppress the width variation corresponding to the width variation of the belt rubber material extruded from the injection molding machine. Since the material can be wound around the tire molding drum, regardless of the size, type, physical properties and injection capacity of the strip rubber material, the fluctuation of the width of the strip rubber material is suppressed, and the tire molding drum is stable in shape and weight. Can be uniformly wound. Accordingly, the profile shape of the tire can be kept constant, which helps to improve uniformity.
[0012]
In the present invention, the drum winding speed is reduced when the measured width of the belt-like rubber material becomes narrower than a predetermined width, and the drum winding speed is set to a predetermined set speed when the width returns to the predetermined width. Control to return to.
[0013]
As this control, when the detection width of the width sensor becomes equal to or less than a predetermined width different from the predetermined width , the rotation speed of the tire forming drum is set to a predetermined rotation speed only for a predetermined time. When this control is performed, the number of times of control to decelerate to the predetermined rotational speed is calculated only during the predetermined time, and the winding time is set to the time corresponding to the number of times of deceleration. It is preferable to perform the control to extend.
[0014]
In addition to the above control, the drum winding speed can be controlled using feedback control in which the width of the belt-shaped rubber material is a control amount, the predetermined width of the belt-shaped rubber material is a target value, and the drum winding speed is an operation amount. In this feedback control, any one or combination of PID (proportional-integral-derivative) control can be used, and the amount of deviation of the drum winding speed from a predetermined set speed other than the feedback control is Control for adjusting to be proportional to the deviation between the measured width of the belt-shaped rubber material and the predetermined width, and control for adjusting the drum winding speed to be proportional to the measured width of the belt-shaped rubber material Etc.
[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 at the end of winding of the belt-shaped rubber material is set to a predetermined length. Configured to perform control.
[0016]
And by these controls, it is possible to form a tire with a uniform shape and weight on the circumference.
[0017]
A tire molding system including an injection molding machine for carrying out the method for controlling the winding of a belt-shaped rubber material from the injection molding machine includes an injection molding machine for continuously extruding a belt-shaped rubber material, and the injection molding machine. A tire molding system comprising: a tire molding drum around which the belt-shaped rubber material extruded from the vehicle is wound; a control device that controls the injection molding machine and the tire molding drum; and the control device includes the injection molding machine When a detection value of a width sensor that detects the width of the belt-shaped rubber material provided between the tire molding drums is input and the detection value becomes smaller than a predetermined first determination value, the drum winding speed a control dropping, and the drum winding speed when the detected value is returned to the first judgment value as characterized by performing the control of returning to a predetermined set speed.
[0018]
In the tire molding system equipped with this injection molding machine, the width of the belt-shaped rubber material is measured by a width sensor, and the rotation of the tire molding drum is controlled using the detected width. Accordingly, the drum winding speed can be adjusted in a direction that suppresses fluctuations in the width, so that the shape and weight of the belt-shaped rubber material can be made uniform and the tire molding drum accurately regardless of the size, type, physical properties and injection capacity of the belt-shaped rubber material. Can be wound.
[0019]
DETAILED DESCRIPTION OF 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 equipped with an injection molding machine for carrying out the method for controlling the winding of a strip rubber material from the injection molding machine injects a tire molding drum 1 and a strip rubber material W. An injection molding machine 3 and a control device (servo controller) 4 having a control circuit are provided.
[0021]
Further, a slack sensor 5 formed by a non-contact type displacement detection sensor for detecting a slack amount of the belt-like rubber material W is disposed at the head portion of the injection molding machine 3, and the discharge port 3a of the injection molding machine 3 and the tire molding. A slack amount Dm between the drum 1 and the drum 1 is detected and output to the control device 4.
[0022]
In this control device 4, when the injection speed Vp for molding operation is set and inputted, the plunger speed V of the injection molding machine 3 is controlled so as to become this 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 control device 4 receives this detection signal Vm and feeds back the plunger speed V to the injection speed Vp. Control.
[0023]
In the present invention, a width sensor 6 is further disposed between the discharge port 3 a of the injection molding machine 3 and the tire molding drum 1, and the belt-like 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 of extrusion to the end of extrusion, and control is performed to adjust the drum winding speed VR in accordance with the change in the measured width Bm. That is, the control device 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 drum rotation speed Rp signal is input to a servo drive motor 2 that drives the tire molding drum 1 to rotate the tire molding 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) by the signal of the drum rotation speed Rp, so that the injection molding machine 3 is made to have a width of the tire molding drum 1. And reciprocating in the direction at a speed synchronized with the drum rotation speed Rp.
[0026]
In other words, the plunger speed V of the injection molding machine 3 is controlled based on the set injection speed Vp, and the tire molding drum 1 has a slack amount Dm detected by the slack sensor 5, an injection speed Vp, and a 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 molding drum 1 in synchronization with the drum rotation speed Rp.
[0027]
By these controls, the belt-like rubber material W extruded from the injection molding machine 3 is sandwiched between the sub-roller 1a, the pressing roller 1b, and the tire molding drum 1 and then wound around the tire molding 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 injected from the injection molding machine 3 in the tire molding system 10, a case study of the injection conditions and the injection state for each type, physical property, and injection volume of the belt-shaped rubber material W is conducted in advance through experiments. The optimal acceleration time tp1 related to the injection speed Vp of the plunger and the optimal acceleration time td1 related to the rotation speed Rp of the tire molding drum 1 are set with respect to the type, physical properties and injection capacity of the belt-like rubber material W. The amount of slack D1 is stored as a database.
[0030]
Then, at the stage where the type, physical properties and injection capacity of the belt-like 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 molding drum 1 and its Set the acceleration target curve (master curve).
[0031]
The injection speed Vp of the plunger is accelerated according to the acceleration target curve, reaches the injection speed Vpp which is a constant speed portion in the acceleration region, and is further accelerated when the constant speed portion ends, and reaches the final top speed Vpm. To do. In the present invention, since the main point of the invention is the rotation control of the tire molding drum 1, detailed description of the control of the plunger of the injection molding machine 3 is 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 × Rp, r: winding radius).
[0033]
Then, the tire molding drum 1 starts rotating when the slack amount Dm detected by the slack sensor 5 reaches the predetermined slack amount Ds, and starts winding the belt-shaped rubber material W. The drum winding speed VR (or tire forming drum rotation speed R) is accelerated according to the acceleration target curve, and is controlled to be a predetermined set drum winding speed VRp (Rp) which is a constant speed portion in the acceleration range. After reaching a predetermined drum winding speed VRp (Rp), basically, it is controlled in synchronization with the injection speed Vpp of the plunger that has become a constant speed, and after entering the acceleration range, The plunger is controlled in synchronism with the top speed Vpm of the plunger which has become a constant speed.
[0034]
However, the belt-like rubber material W pulsates and the width B varies depending on the type of compound, such as a large amount of silica, especially during constant speed operation, and therefore the measured width Bm of the belt-like rubber material W varies. When the width becomes narrower than the predetermined width (target width) Bs, the drum winding speed VR (R) is decelerated. When the width becomes larger than the predetermined width Bs, the drum winding speed VR (R) is increased. When the width returns to the predetermined width Bs, control is performed to return the drum winding speed VR (R) to a predetermined set drum winding speed VRp (Rp).
[0035]
The drum winding speed VR, that is, the rotation speed R of the tire forming drum 1 is controlled when the detection width Bm of the width sensor 6 is equal to or smaller than a predetermined width B1, that is, as shown in FIG. When the output voltage value E of 6 becomes equal to or higher than the predetermined voltage value E1, control is performed to decelerate to a predetermined drum winding speed VR1 (R1) for a predetermined time tb1. That is, the decelerated rotation is performed for a certain time tb1 and a certain amount ΔVR1. The values of the predetermined width Bs, the constant time tb1, and the constant amount ΔVR1 are obtained and set in advance through experiments or calculations, and are input to the control device 4.
[0036]
The traverse drive motor (not shown) is driven in synchronism with the rotational speed R of the tire molding drum 1 to reciprocate the injection molding machine 3 in the width direction of the tire molding drum 1.
[0037]
Also, the number of times of deceleration for a certain time and a certain amount is calculated, and the time corresponding to the number of times of deceleration, that is, the time obtained by multiplying the number of times of deceleration (calculated in advance) by the number of deceleration Only when the winding time is extended, the time when the start end and the end end are in the same position in the circumferential direction is calculated, and when this time elapses, the strip rubber material W is cut with a wire of a cutting device (not shown) to finish the process. To do.
[0038]
At the time of this termination process, for example, the sub roller 1a is separated from the tire molding drum 1 to form a gap, and a cutting device (not shown) is rotated along the outer peripheral portion of the sub roller 1a, and the belt-like rubber material W is formed by the wire of the cutting device Disconnect. In order to prevent the cut end of the belt-like rubber material W from being disturbed, the cut end of the belt-like rubber material W is pressed against the tire molding drum 1 with a press roller (not shown), and a series of winding operations are 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, fluctuations in the width B can be suppressed. 1 can be wound.
[0040]
The drum winding speed VR, that is, the rotation speed R of the tire forming drum 1 can be controlled by the following control in addition to the above control.
[0041]
One control is that the deviation amount (ΔRb = R−Rp) of the rotational speed R of the tire molding drum 1 from the predetermined set rotational 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 is adjusted to be proportional to the amount of deviation (ΔB = Bm−Bs), that is, feedback control with R = C1 × (Bm−Bs) + Rp.
[0042]
Another control is a control for adjusting the rotational speed R of the tire molding drum 1 to be proportional to the measured width Bm of the belt-shaped rubber material, that is, a control of R = C2 × Bm.
[0043]
Alternatively, the rotational speed Rm of the tire forming drum 1 with respect to the measurement width Bm set stepwise is determined and input in advance, and the rotational speed Rm is selected or calculated from the actually measured width Bm to rotate the rotational speed R. The control may be as follows.
[0044]
In the case of this control, the rotational speed R (measured value Rm or command value Rp) of the tire forming drum 1 is cumulatively calculated to obtain a predetermined rotation amount LRs, that is, a predetermined rotation from one rotation to several rotations. When the rotation ends by several LRs and the starting end and the terminal end are in the same position, the band-shaped rubber material W is cut with a wire of a cutting device (not shown) and the finishing 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 end of winding of the belt-shaped rubber material W is determined in advance. The length Ls (= r × LRs) is controlled.
[0046]
【The invention's effect】
As described above, according to the method for controlling the winding of the strip rubber material from the injection molding machine and the tire molding system including the injection molding machine according to the present invention, between the discharge port of the injection molding machine and the tire molding drum. The width of the extruded rubber material is measured by the arranged width sensor, and the drum winding speed is adjusted in accordance with the change in the measured width, so that the rubber band material extruded from the injection molding machine is used. The belt-shaped rubber material can be wound around the tire molding drum while adjusting the drum winding speed, that is, the rotation speed of the tire molding drum, in a direction to suppress the width variation in response to the variation in the width of the tire.
[0047]
Therefore, regardless of the size, type, physical properties, and injection capacity of the belt-shaped rubber material, the variation in the width of the belt-shaped rubber material can be suppressed, and the shape and weight can be uniformly wound and accurately wound around the tire molding drum. . Accordingly, the profile shape of the tire can be kept constant, which helps to improve 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 showing an example of a time series of drum winding speeds based on a control method according to an embodiment of the present invention.
FIG. 3 is a view showing an appearance of a width detection 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 view showing an initial winding state in a tire molding system including a conventional injection molding machine.
6 is a view showing a winding state in a tire molding system including the injection molding machine of FIG.
FIG. 7 is a diagram showing a variation state of the width of a belt-shaped rubber material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tire molding drum 2 Servo drive motor 3 Injection molding machine 4 Control apparatus (servo controller)
5 Slack sensor 6 Width sensor 10 Tire molding system B equipped with an injection molding machine Width Bm of band-shaped rubber material Measured width Bs Predetermined width (target width)
Dm Slack displacement R, Rp Tire molding drum rotation speed VR, VRp Drum winding speed W Band-shaped rubber material

Claims (5)

  A width sensor disposed between a discharge port of the injection molding machine and the tire molding drum in a belt rubber material winding control method for winding a belt rubber material continuously extruded from an injection molding machine around a tire molding drum Thus, a method for controlling the winding of the belt-shaped rubber material from the injection molding machine, in which the width of the belt-shaped rubber material extruded from the injection molding machine is measured and the drum winding speed is adjusted in accordance with the change in the measured width. Measured width of the strip rubber material, when it becomes narrower than the predetermined width dropped drum winding speed, performs control to return the drum winding speed to a predetermined set speed in the case of returning to the predetermined width A method for controlling the winding of a belt-shaped rubber material from an injection molding machine according to claim 1. Control that reduces the rotational speed of the tire forming drum to a predetermined rotational speed only for a predetermined time when the detection width of the width sensor becomes equal to or smaller than a predetermined width different from the predetermined width. A method for controlling the winding of a belt-shaped rubber material from an injection molding machine according to claim 2. 4. From the injection molding machine according to claim 3, wherein the number of times of control for decelerating to the predetermined rotation speed is calculated only during the predetermined time, and the winding time is controlled to be extended for a time corresponding to the number of times of deceleration. Belt rubber material winding control method. An injection molding machine that continuously extrudes a band-shaped rubber material, a tire molding drum that winds the band-shaped rubber material extruded from the injection molding machine, and a control device that controls the injection molding machine and the tire molding drum In the tire molding system, the control device inputs a detection value of a width sensor provided between the injection molding machine and the tire molding drum for detecting the width of the belt-shaped rubber material, and the detection value but a control for lowering the drum winding speed if it becomes smaller than the predetermined first determination value, the control of returning the drum winding speed to a predetermined set speed in the case where the detected value is returned to the first determination value tire forming system comprising an injection molding machine to carry out.

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