CN1522846A - Method for forming blow-molded product of exhaust elbow - Google Patents

Abstract

The present invention provides a method for forming an exhaust elbow blow-molded product. The method mainly involves that during the blow-molding process, when the end of the blank vertically enters the bend in the mold, a special tool made of iron wire (strip) is inserted into the mold to pull the end of the blank and guide the end of the blank to the outside of the mold port. The process can be produced by ordinary machines, avoiding the danger of manual pulling, and the manufacturing cost is lower than that of using a vacuum machine, and the economic benefit is very high.

Description

Forming method of exhaust elbow blow molded products

technical field

The invention relates to a method for forming blow-molded products, in particular to a method for forming blow-molded products of an exhaust elbow.

Background technique

Conventionally, the exhaust elbow 10 made by blow molding has grooves 20 and 22 near the two ports, as shown in FIG. 1 . The current general method is to feed the hollow blank (heated plastic) into the mold from the top of the left and right semi-closed molds in a vertical manner. Pull the blank end in the other port of the mold, guide the blank end to protrude out of the mold, and then close the gate of the second port of the mold. Inject compressed air into the hollow billet in the mold, the compressed air will cause the billet to expand and deform in the limited mold cavity, so that the deformed billet will melt on the inner wall of the mold cavity to form the desired product, and it can be fully formed after demoulding. As mentioned above, in the current general method, during the blow molding process, the billet is bent and guided to the port of the mold by hand, and then the gate of the port of the mold is closed. This action is quite dangerous. In addition, the action of pulling the billet by hand cannot be consistent every time, making the blow molded product unstable, with edge scraps, and a high defect rate. Although, in Japan's related manufacturing industry, there is a method of using a vacuum machine to extract blanks, but the cost of mechanical equipment is too high, and only a very small number of manufacturers use it.

Contents of the invention

In view of the above-mentioned danger of pulling the billet by hand, the quality of the finished product is not good, and the high cost of the vacuum machine is low, the inventor has accumulated many years of manufacturing experience in related industries, and has gone through countless tests and attempts , and finally invented a method for forming exhaust elbow blow molded products of the present invention.

The main purpose of the present invention is to provide a method for forming blow molded products of an exhaust elbow. The main reason is that during the blow molding process, when the end of the blank enters the bending part of the mold vertically, a special tool made of iron wire (strip) is inserted into the mold to pull the end of the blank and guide the end of the blank to the outside of the mold port. Production avoids the danger of manual pulling, and the manufacturing cost is lower than using a vacuum machine, and the economic benefits are high.

Description of drawings

Figure 1: Schematic diagram of the appearance of the exhaust elbow blow molded product.

Figure 2: Schematic diagram of the manufacturing process of the present invention.

Figure 3: Cutaway side view of the mold.

Figure 4: Top view of the mold.

A brief description of the component numbers in the figure:

10. Exhaust elbow 12 Left half mold 14 Right half mold

16 gates 18 gates 20 grooves

22 grooves

Detailed ways

In order to achieve the above object, the technology, means and effects obtained by the present invention are described in detail as follows with reference to a preferred embodiment and accompanying drawings. It is hoped that the purpose and characteristics of the present invention can be further understood.

Please refer to Fig. 2, which is a flow chart of a method for forming exhaust elbow blow molded products according to the present invention. Inflation → expansion → product forming → demoulding, and please refer to Figure 3 and Figure 4; the detailed process is as follows:

First heat the billet to make it nearly hot-melt and have a hollow shape, then half-close the left half mold 12 and the right half mold 14 with a hydraulic cylinder or pneumatic cylinder, and then heat the billet in a vertical manner from left to right half-close the mold The top ends of 12 and 14 are fed into the molds 12 and 14. When the blank end enters the bending part of the mold 12 and 14 vertically, a special tool made of iron wire (strip) is inserted into the other port of the mold 12 and 14 to pull the blank end. , Guide the blank end to the outside of the mold 12,14, and the rear oil pressure cylinder or pneumatic cylinder completely closes the two port gates 16,18 of the mold 12,14. Then, inject compressed air into the hollow billet in the mold 12, 14, the compressed air will cause the billet to expand and deform in the limited mold cavity, and make the deformed billet expand, and form the desired product on the inner wall of the mold cavity. Fully formable. This method of the present invention can avoid the danger of manual pulling by hand, and make the action of pulling the end of the blank consistent. There is no edge material in the forming of the exhaust elbow, the product is stable, the quality is improved, and the manufacturing cost is lower than that of using a vacuum. The machine is cheap, the erection of the mold is simpler, and it has practical value in industry.

Although, in the above description, a preferred specific embodiment of the present invention has been given and described in conjunction with the accompanying drawings, obviously, those familiar with relevant skills can make modifications to this embodiment without violating the principle of the present invention, and the scope of the present invention Defined by the following claims.

Claims (1)

1. A method for forming blow-molded products of an exhaust elbow. A hollow plastic blank is sent into the mold vertically through the top ends of the left and right semi-closed molds. The feature is that: when the blank end enters the mold vertically When bending, a special tool made of iron wire or iron bar is inserted into the other port of the mold to pull the end of the blank and guide the end of the blank to the outside of the mold.

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