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Mould on Tires The processing technology

Oct 17, 2017

Tire molds are used for moulding all kinds of tire molds. Tire mould classification 1: adjustable mold, made of pattern ring, mould sleeve, upper and lower side board. 2: two and a half molds are composed of top die and bottom die.

Tire mould processing technology

Meridian tire cord arrangement of different body next round of seiko mechanical radial tyre, arrange the cord is not cross each other, but parallel to the outer tube section close to, like the earth meridian, cord Angle is small, generally to 0 °, tire cord not sustain the intersection point between body, when the tyres in the process of driving, crown ambient stress increase, will cause the circumferential stretching, tire body into radial fissure. Therefore meridian tire buffer layer to deal with close to a week to arrange cord layer, and tire cord Angle 90 ° intersection, generally is 70 ° to 78 °, form a rigid ring belt can hardly done, fixed the whole tire, limit the tire circumferential deformation, the buffer layer under the internal stress of the tire from 60% to 70%, become the main force of radial tire components, called radial tyre with beam layer. The main force components of the oblique tyres are not in the buffer layer, and 80% to 90% of the internal stress is borne by the curtain layer of the fetus. Thus, radial tyre with beam layer design is very important, must have good rigidity, can use multilayer large Angle, high strength and not easy to stretch fiber material, such as steel wire or fiber glass, etc

Take the active mold as an example

1: according to the tire mould drawing of the Ming wheel, it is cast or forged blank, and then rough and heat treatment. The tire mould is completely annealed, the internal stress should be eliminated, and the annealing should be laid flat to avoid the deformation too much.

2: according to the drawing, the outer diameter and height of the pattern ring are put in place according to the drawing of the semi-precision car, and the inner cavity of the semi - precision car is used to make the inner cavity of the car.

3: use the finished tire pattern electrode to make the decorative pattern of the decorative pattern in the pattern ring, with the sample test.

4: divide the decorative pattern into several parts according to the requirements of the manufacturer, draw the line of marking separately, and put in the back of the work load and tap the back of the back hole and tap the silk.

5. Cut the equal parts in accordance with the process.

6. The cut pattern block is arranged in the pattern to light, clear Angle, clear root and air vent.

7: evenly spray sand on the inside of the pattern cavity, and require color consistency.

8. Assemble the pattern ring, mould sleeve and upper and lower side panels to complete the tire mould.

Maintenance method of tire mould

Mold is an important tool used in tire vulcanization process, mould in use process inevitably affected by rubber, chelating agent and the release agent used in the process of sulfide deposition pollution comprehensive (main pollutant is sulfide, inorganic oxide, and silicon oil, carbon black, etc.), repeated use will cause some pattern pollution dead zone. So, must be regularly clean mold to ensure the cleanliness of the surface, to ensure the quality of the tire and the service life of mould, for this reason, the development of the tire mold cleaning technology is the industry attention.

There are two types of traditional cleaning methods for tire mould:

1.1 mechanical cleaning

The manual abrasive cloth or steel wire is used to grind and dry sand, and different combinations can be used according to the requirements. Mechanical cleaning is a mature technology which is widely used in tire industry. The method is simple and easy to use, and has no high advantages for equipment and tools, but there is also an insurmountable flaw: it can cause mechanical damage to the mould and shorten the die life. Sandblasting can easily clog the air hole of the mould, and the discharge of air vent after sandblasting is very heavy. Must remove the mold, cause the labor intensity high, the cleaning cycle long.

1.2 chemical cleaning

Chemical cleaning methods mainly include: organic solvent method, melting method, pickling method and alkaline washing method. These methods are easy to use and low in cost. But long-term use of the above methods can cause corrosion of the mold, thus directly affecting the appearance and quality of the products; At the same time, these agents pollute the environment and harm the health of the operators. They must have complete labor protection methods and pollutant treatment equipment. At present, the law is mainly used in small rubber enterprises.

With the development of science and technology, some new technologies are being developed and applied. The cleaning technology will bring a "revolution" to the much-anticipated cleaning industry. But whether these higher-investment technologies can be accepted by the market will also have to be tested. The following article will focus on the new technologies that have been applied to industrialization.

2. New cleaning techniques

2.1 laser cleaning technology

Laser cleaning technology is a new kind of cleaning technology which has been developing rapidly in the past 10 years. It has gradually replaced the traditional cleaning process in many fields with its many advantages

Laser cleaning technology refers to the use of high energy laser beam irradiation surface, the surface dirt and rusty spot or coating momentarily evaporation or splitting, high-speed effectively remove attachments to or surface coatings, clean the surface of the object so as to achieve a clean process. It is based on the effects of the interaction between laser and material, a new technology with the traditional mechanical cleaning, chemical cleaning and ultrasonic cleaning method (wet cleaning process) is different, it does not need to use any destruction of the ozone layer of CR him organic solvent, no pollution, no noise, harmless to the human body and environment, is a kind of "green" cleaning technology.

The mechanism of laser cleaning is used for molds cleaning, is to use clean substrate (also known as the mother) and surface attachments (dirt) on a particular wavelength laser energy, with large differences between the absorption coefficient. Radiation to the surface of the laser energy, most is absorbed by surface attachments to make heat evaporation evaporation or instantaneous expansion, and the surface of steam flow, from the surface, to do cleaning.

Cleaning used in tire mold, mold absorb certain wavelengths of laser, energy, will not cause damage, mold surface contamination (sulfide, inorganic oxide, and silicon oil, carbon black, etc.) to absorb a lot of energy, was instantly expansion, evaporation evaporation, out of the mold surface, thus to achieve the cleaning effect.

Laser cleaning methods mainly include:

1) laser dry cleaning method, which USES pulse laser direct radiation to decontamination;

2) laser + liquid film method, namely, firstly, deposit a layer of liquid film on the surface of the substrate and then decontamination with laser radiation;

3) the method of laser + inert gas, which is to blow the surface of the substrate with inert gas while the laser radiation is applied. When the dirt is removed from the surface, it will be blown off the surface immediately to avoid surface contamination