JP3363483B2 - Shaping pressure control method for tire vulcanizer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a shaping pressure of a tire vulcanizer, and more particularly, to a method for controlling a shaping pressure of a tire vulcanizer.
The present invention relates to a method for controlling a shaping pressure of a tire vulcanizer in which a shaping pressure supplied to a bladder inserted into a green tire is steplessly controlled. 2. Description of the Related Art Conventionally, in a tire vulcanizer, a shaping gas of a predetermined pressure is supplied to a bladder inserted into a green tire from the start of press closing by an upper die to the full closing stroke of the press. That is being done. The shaping gas pressure may be the bladder durability, life and vulcanization failure (e.g., a buckle bladder (BWB) in which the grown bladder folds in the green tire because the shaping pressure is higher than the set pressure, and the bead width may not be uniform Pinched bead (PB), narrow bead (NB), shaping pressure is low, bladder does not expand uniformly,
It has a close causal relationship with light failure that causes air accumulation in the green tires and deteriorates the flow of rubber), and is an important management item at the vulcanization site, and there is a need to improve the shaping pressure setting method. Was. [0003] In a conventional vulcanizer, the shaping pressure is generally switched in two or three stages in accordance with the height of the press by the upper mold. That is, as shown in FIGS. 8 and 9, the bladder 2 is inserted into the green tire W set in the lower mold 1, and from when the press by the upper mold 3 is started to when the press is fully closed. Opening of a control valve 6 provided in a shaping gas supply path 5 connected to the bladder 2 via three switching valves # 1, # 2 and # 3 connected to a cam switch 4 linked to the upper mold 3. The shaping gas pressure was supplied into the bladder 2 by controlling the degree in two or three stages. [0004] However, if the setting of the shaping pressure is not changed delicately due to the aging of the bladder due to the number of uses of the bladder or the like, the above-described vulcanization failure may occur, and therefore, However, the control of the shaping pressure is difficult, which hinders the reduction of vulcanization failure. Further, when the shaping pressure is controlled in three stages as described above, the bladder has a problem in durability and vulcanization performance because a sudden fluctuation in shaping pressure repeatedly acts on the bladder. [0005] The present invention has been devised in view of such conventional problems, and takes into account the aging of the bladder and the like.
By controlling the shaping pressure steplessly, vulcanization failure can be reduced, and the bladder durability and
It is an object of the present invention to provide a method for controlling a shaping pressure of a tire vulcanizer capable of improving the vulcanization performance of a tire. In order to achieve the above object, according to the present invention, a bladder is inserted into a green tire set in a lower mold, and a press fully closing process is performed from the start of press closing by the upper mold. A shaping pressure control method for a tire vulcanizer in which the shaping gas pressure supplied to the bladder is steplessly controlled until the sequencer controlling the shaping gas pressure closes a press by an upper mold in advance. The control pattern of the shaping gas pressure during the period from the start to the press fully closing stroke is stored, and in this sequencer, the height position information of the upper mold, the tire size information, and the bladder use count information are input. The control pattern is calculated and corrected using the output signal from the sequencer. The gist is to control the opening degree of a control valve provided in a shaping gas supply path connected to the bladder so that the shaping gas pressure acts on the bladder in a stepless manner so as to form a rule pattern. Things. The present invention is configured as described above, and inputs the height position information of the upper mold, the tire size information, and the bladder use count information to the sequencer at the time of vulcanizing the tire. By correcting the control pattern of the shaping gas pressure previously input to the sequencer and calculating and controlling the opening of the control valve provided in the shaping gas supply path connected to the bladder by the output signal from this sequencer, the bladder The pressure of the shaping gas supplied to the is controlled steplessly. An embodiment of the present invention will be described below with reference to the accompanying drawings. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a schematic configuration diagram of a tire vulcanizer and a control device for implementing a shaping pressure control method of a tire vulcanizer. FIG. It is a graph explanatory view showing the relationship with. In FIG. 1, reference numeral 1 denotes a lower mold in which a green tire W is set, 2 denotes a bladder inserted into the green tire W, 3 denotes an upper mold, and a shaping gas supply path 5 connected to the bladder 2. Is provided with a control valve 6 for controlling the supply pressure of the shaping gas P. The control valve 6 has a sequencer 8 (PLC: programmable) through an electropneumatic converter 7.
Logic controller) is connected, and the sequencer 8 pre-stores a control pattern of the shaping gas pressure from the start of press closing by the upper mold 3 as shown in FIG. . The sequencer 8 includes a position detector 9 for detecting the height position of the upper mold 3 and outputting height position information, a host computer 10 for outputting tire size information for vulcanization, and a bladder. The bladder usage counter 11 for inputting the usage count information is connected, and the above-described information is input from the green tire W insertion process to the press fully closing process. In the case of the present invention, the vulcanization failure can be reduced by controlling the shaping pressure in a stepless manner, particularly in accordance with the number of times the bladder 2 is used. As shown in the figure, the elongation of the bladder 2 changes with the aging of the bladder 2, so that the bladder 2
Is new (bladder new), the shaping pressure is increased, and if the bladder 2 becomes old (blader old) due to the number of times the bladder 2 is used, the shaping pressure is reduced. . Next, a method of controlling the shaping pressure of the tire vulcanizer will be described with reference to FIG. 1 and FIGS. First, a control pattern of shaping gas pressure for each tire size is input to the sequencer 8 and stored, and information on the number of times the bladder 2 is used is input from the bladder usage counter 11 to the sequencer 8. Next, as shown in FIG. 3, the green tire W is set in the lower mold 1 by the green tire insertion device 12, and the bladder 2 is inserted into the green tire W. As shown in (1), a shaping gas is supplied into the bladder 2 to start shaping.
Next, the upper mold 3 is lowered to start the press closing stroke,
The position detector 9 detects the height position of the upper mold 3 between the start of the press closing stroke and the press fully closing stroke,
The height position information is sequentially output to the sequencer 8 and input. In the sequencer 8, based on the height position information of the upper mold 3, the tire size information, and the bladder usage count information, the control pattern of the shaping gas pressure previously input to the sequencer is calculated and corrected. The corrected value is output to the electropneumatic converter 7. According to the output signal from the sequencer 8, the electropneumatic converter 7 converts the electric signal into a pneumatic signal, controls the valve opening of the control valve 6 in proportion to the electric signal, and determines the shaping gas pressure P to be supplied to the bladder 2. The control is performed steplessly as shown in FIG. As described above, the shaping gas pressure P supplied to the bladder 2 is different between the new bladder 2 and the bladder 2 that has been used repeatedly because the material of the bladder 2 changes with time. The gas pressure P is also automatically controlled. While controlling the shaping pressure based on the press closing stroke of the upper mold 3, from the press closing stroke in FIG. 6 to the full closing stroke (press closing limit) in FIG. 7, the shaping pressure is steplessly adjusted. This is controlled and supplied. As described above, by controlling the shaping pressure P of the tire vulcanizer steplessly, it is possible to reduce the vulcanization failure and to omit the manual management, and to improve the vulcanization performance of the tire. And productivity can be improved. According to the present invention, the bladder is inserted into the green tire set in the lower mold as described above, and the green tire is inserted between the start of the press closing by the upper mold and the full closing stroke of the press. A shaping pressure control method for a tire vulcanizer in which a shaping gas pressure supplied to a bladder is steplessly controlled, wherein a sequencer for controlling the shaping gas pressure includes: The control pattern of the shaping gas pressure up to the stroke is stored, and the height pattern information of the upper mold, the tire size information, and the bladder use count information are input to the sequencer to calculate and correct the control pattern. Then, according to the output signal from the sequencer, the control pattern By controlling the opening of a control valve provided in a shaping gas supply path connected to the bladder to control the shaping gas pressure to act steplessly on the bladder, it is possible to reduce vulcanization failure. As well as improving the durability of the bladder and the vulcanization performance of the tires, it can also perform all operations automatically without manual intervention, so that management such as setting of shaping pressure can be simplified, This has the effect of improving workability and productivity.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a tire vulcanizer and a control device for implementing a method of controlling a shaping pressure of a tire vulcanizer. FIG. 2 is an explanatory graph showing a relationship between a shaping pressure and a pressing stroke of a green tire W from a fully inserting stroke to a full closing stroke. FIG. 3 is an explanatory diagram of a process of inserting a green tire into a vulcanizer. FIG. 4 is an explanatory diagram showing a shaping start state of a bladder inserted into a green tire. FIG. 5 is an explanatory diagram showing a press closing start process by an upper mold. FIG. 6 is an explanatory view showing a middle of a press closing stroke by an upper mold. FIG. 7 is an explanatory view showing a fully closing stroke (press closing limit) of an upper mold. FIG. 8 is a schematic configuration diagram of a tire vulcanizer and a control device for implementing a conventional shaping pressure control method for a tire vulcanizer. FIG. 9 is a graph explanatory diagram showing a relationship between a shaping pressure and a conventional fully-pressing stroke from the insertion stroke of the green tire W to the press. [Description of Signs] 1 Lower mold 2 Bladder 3 Upper mold 5 Shaping gas supply path 6 Control valve 7 Electropneumatic converter 8 Sequencer 9 Position detector 10 Host computer 11 Bladder usage counter W Green tire P Shaping pressure

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 33/02-33/08 B29C 35/02-35/14

Claims (1)

(57) [Claims] [Claim 1] A bladder is inserted into a green tire set in a lower mold, and the bladder is inserted into the bladder from the start of press closing by the upper mold to the full closing stroke of the press. A method for controlling a shaping pressure of a tire vulcanizer in which a shaping gas pressure to be supplied is steplessly controlled. The control pattern of the shaping gas pressure during is stored, and in this sequencer, the height pattern information of the upper mold, the tire size information, and the bladder use count information are input and the control pattern is calculated and corrected, According to the output signal from the sequencer, the bladder is controlled to be the control pattern. Controlling the opening of a control valve provided in a continuous shaping gas supply path so that the shaping gas pressure acts on the bladder in a stepless manner. .