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Principles and methods of blow mold temperature control

    The mold temperature has a great influence on the molding quality of the colloid and the molding efficiency. In a mold having a higher temperature, the fluidity of the molten compound is good, which is advantageous for the rubber to close the cavity, acquiring the appearance surface of high quality collaps, but will make the rubber curing time be long, easy to get out Deformation : For the crystalline rubber, more conducive to the crystallization process, avoiding the change in the size of the colloidal parts in use; in a lower mold in the warm house, the molten rubber is difficult to close the cavity, resulting in an increase in internal stress, There is no shiny surface, producing a silver pattern, welding, and other defects.

Different compounds have different processing process, and the surface requirements and structures of various collapsies are different. In order to produce collaps in line with quality requirements in the most effective time, this requires the mold to maintain a certain temperature, mold temperature. The more stable, the product produced by the collapse of the product is in terms of the requirements of the size, the appearance of the collaps. Therefore, in addition to the factors in mold manufacturing, the mold temperature is an important factor in controlling the quality of the colloidal product, and the mold temperature should be considering the mold temperature.

Principles of mold temperature control In order to ensure the production of high appearance quality requirements, the size of the size, the dimension, and small-dimensioned rubber parts should be clearly understood, and the basic principles of mold temperature control should be clearly understood.

(1) Different compounds require different mold temperatures.

(2) Different surface quality, molds of different structures require different mold temperatures, which requires targeted when designing temperature control systems.

(3) The temperature of the precofer is higher than the temperature of the rear mold, and the temperature difference is about 20 to 30 degrees.

(4) The precoferous temperature of the fire pattern is higher than the preconduous temperature of the general surface requirements. When the current model is hot or hot oil, the general temperature difference is about 40 degrees.

(5) When the actual mold temperature cannot reach the required mold temperature, the mold should be warmed. Therefore, when the mold is designed, it should be fully considered to meet the heat of the mold to meet the mold temperature requirements.

(6) The heat brought into the mold is removed by thermal radiation and thermal conductivity, and most of the heat is required to be joined by the heat transfer medi

Mold temperature control method

The mold temperature is generally controlled by adjusting the temperature of the heat transfer medium, the method of the heat insulating plate, heating the rod. The heat transfer medium is used in water, oil, etc., which is often referred to as a cooling waterway. Reduce the mold temperature, generally use the front mode “machine” (about 20 degrees), then The inventive “frozen water” (4 degrees left) is achieved. When the passage of the heat transfer medium is unable to pass the heat transfer efficiency, heat transfer is used to heat transfer medium, or the heat pipe is transmitted to the heat transfer medium, or a “heat pipe” is used. Cooling. Rising the mold temperature, generally adopted in the cooling waterway into hot water, hot oil (heating). When the mold temperature is high, in order to prevent heat transfer from heat transfer, the thermal insulation can be increased. Cooling system design principle

(1) The distance between the hole wall of the cooling waterway to the cavity surface should be equal as possible, generally 15 to 25 mm

(2) The number of cooling waterways as much as possible, and to make it easy for processing, the two parallel waterways are 40 ~ 60mm

(3) All molding parts are required to pass cooling waterways, unless no position, and the amount of heat aggregation strengthens cooling.

(4) Reduce the temperature difference of the inlet and the water port. In-water, the water temperature difference affects the uniformity of the mold cooling, so it should be indicated when designing the water, the direction of water, and the mold is required to be indicated on the billet. The transportation process should not be too long, preventing the temperature difference caused by excessive water.

(5) Try to minimize the existence of “dead water” (not involved in flowing) in the cooling waterway.

(6) The cooling waterway should avoid being provided at the predictable colloidal weld.

(7) Officiency of the minimum margins of the cooling waterway (i.e., the thickness of the peripheral of the aperture), requires the side pitch greater than 3 mm when the water channel length is less than 150 mm; when the water channel length is greater than 150 mm, the side pitch is greater than 5 mm.

(8) When the cooling waterway is connected, it should be sealed from the “O” glue, and the sealing should be reliable without leakage.

(9) There should be other coolant, such as beryllium copper, heat pipe, etc.

(10) Reasonably determine the position of the cooling water joint to avoid affecting the mold installation, fixation. um of the circulation. The heat in the ferrous heat such as beryllium copper is no exception.

(7) The mold temperature should be balanced, and there is no local overheating, too cold.

 

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