Reverse-forming sulfuration method for sealed type tooth-shaped edge V tape of rubber lagging

Abstract

It relates to the glue sleeve seal teeth shape reversed V shape forming sulfuration. It makes belt blank at the inner mold, installs the round cylinder glue sleeve with teeth on the surface inside and smooth surface inside both ends on the glue sleeve base and fastened with shrouding rings, putting them into sulfur can, hanging belt blank into glue sleeve, covering the top cap and the cap of the sulfur can, sequentially opening the outside pressure and inner pressure steam for sulfuration, stripping the belt blank round cylinder with vertical rack outside and the cutting belt blank round cylinder, getting many teeth shape cutting V belt. It solves the sealing issue at both ends of the glue sleeve, eliminating the bubbling stratification defect of the product, increasing effective cutting 2-4 lines, reducing material consumption and cost.

Description

technical field [0001] The invention discloses a reverse molding vulcanization method of a rubber-sleeve-sealed tooth-shaped edge-cut V-belt, relating to a manufacturing process of a tooth-shaped edge-cut V-belt. Specifically, using the reverse forming process, first paste cloth, glue, rope core, paste compressed rubber and base cloth on the smooth cylindrical inner mold to make the strip blank, and then press the strip blank with a rubber sleeve with internal teeth and enter the vulcanization cylinder Vulcanized, and finally demolded and cut into product V-belts. Background technique [0002] The toothed cut edge V-belt is a kind of transmission belt. As an important component in the field of mechanical transmission, this toothed edge-cut V-belt has been widely used in automobiles, motorcycles, etc. There are two methods of making V-belts with toothed edges: positive forming and reverse forming. The positive forming process is to first use a cylindrical steel mold with t...

AI Technical Summary

Problems solved by technology

The method of positive forming has the following problems: first, because the surface of the inner mold surrounding the rubber sheet has a tooth shape and is uneven during molding, the rubber sheet and the tooth groove cannot be tightly fitted, and the rubber sheet and the inner mold There are gaps between the tooth grooves. During vulcanization, the pressure difference between the inside and outside of the steam, that is, under the action of external force, the rubber is extruded to make the rubber flow and fill the tooth grooves to form a tooth shape. As the rubber material flows inward, the original winding A good core rope will loosen or even bend, causing the overall strength of the V-belt to decrease and the elongation to increase.

Sometimes, due to the poor fluidity of the rubber, there will be a lack of rubber at the bottom of the tooth, or there are gaps inside, or even delamination, etc., which will reduce the reliability and authenticity rate of the product.

In addition, when this method is vulcanized, the core ropes at both ends of the billet will loosen and deform greatly, because the rubber material is a viscous fluid at high temperature. On the one hand, because the two ends of the mold cannot be completely sealed, part of the glue will flow out of the mold to both ends. At this time, the core ropes at both ends will be severely loosened and deformed, and the cut V-belts at both ends will bend. Generally, both ends need to be cut 20-25 mm unusable parts are lost, causing a lot of waste

There is also an instant sealing problem: at the moment of opening the external pressure, sometimes due to impurities on the surface of the rubber sleeve or deformation of the lip (because the upper cover and the bottom plate are corroded and have holes and deformation due to long-term use at high temperature), it is easy to cause steam leakage. Into the rubber sleeve, resulting in defects such as delamination of the product, decrease in the bonding strength between the core rope and the glue, delamination of the fabric and the glue, and the occurrence rate is 5-10%.

Although the mold production is saved, there are two insurmountable shortcomings: 1. Due to the thin rubber sleeve with teeth on the inner surface made by the positive forming process, the tooth profile of the obtained reverse forming product becomes smaller when it is reversed and used , so that the contact surface between the V-belt and the rotating shaft becomes smaller, resulting in a reduction in the transmission efficiency generated by friction transmission, which is inconsistent with the original design requirements

Second, the rubber sleeve does not consider the sealing problem at both ends, and there are still problems such as product quality caused by unreliable sealing as in positive forming.

Evacuate the air between the steel cylinder and the rubber sleeve to make the rubber sleeve close to the wall of the steel cylinder. After the gap is released, the minimum inner diameter of the rubber sleeve can be increased to the extent that the strip blank can be inserted into it. The main problem is that the rubber sleeve is under tension for a while, and it is under pressure for a while. After the vulcanization, the rubber sleeve and the steel cylinder must be evacuated again to remove the strip blank and the inner mold from the rubber sleeve. The complexity of the process and equipment has caused Increased investment and production costs

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