JPS59125230A - Production of twist formed product of blade for fan or the like - Google Patents

Abstract

PURPOSE:To produce a satisfactory twist-formed product in twist-forming a fan plate, etc. by adding a twist rotation at a prescribed angle to one clamp in the stage of clamping both ends of a hollow or solid blank material for extrusion and subjecting the same to stretching. CONSTITUTION:A fan plate 1 is grasped at both ends with clampers 2 and while the one clamper 2 is stretched, the clamper is rotated at a prescribed angle. Said clamper is rotated about two times as much in the case of two-pieces production. The rotation may be performed before or after the stretching, not simultaneously with the stretching. An ordinary temp. is preferred in the case of aluminum. The operation is simpler, productivity is better and the cost is lower as compared to a conventional pressing method, casting method, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing screw-molded products mainly made of extrusion-molded material made of aluminum, such as blades of fans for blowing air in cooling towers, etc., and handrails for other balconies.

In the case of products such as the blades of ventilation fans,
Functionally, it is required to have a certain angle of twist in the length direction. For this reason, such blades have conventionally been manufactured by press working a plate material or integrally formed by casting. However, all of them generally have the disadvantage of poor production efficiency and high prices, and press-formed products have the disadvantage that it is difficult to obtain high-strength products and are prone to wobbling during use.On the other hand, cast products However, there were drawbacks such as the KM leaf being heavier than necessary, and having voids formed inside, resulting in a partial loss of strength.

The present invention aims to provide a highly efficient method for manufacturing and hanging metal twist-molded products such as fan blades, which solves the above-mentioned problems all at once.

That is, the present invention uses an extruded molded material by extrusion molding and folds it to produce the desired product. 4j, by synchronously carrying out the torsion process, which is a problem here, in combination with the stretching process in which current is applied to the extruded mold material, it is possible to create a uniform uniformity over the entire mold material. It was discovered that torsion could be easily imparted, and it was completed based on this knowledge.

The method for manufacturing twist-molded products such as fan blades according to the present invention uses an extrusion-molded material extruded into a predetermined cross-sectional shape, and performs a required stretch process on the extrusion-molded material (2 steps). The clamping process is performed synchronously with the stretching process by rotating at least one of the clampers of the tension forming machine, whose both ends are clamped, at a predetermined angle around the entire center of the material. be.

Embodiments in which the present invention is applied to the manufacture of fan blades will be described below with reference to the drawings.

In FIG. 1, (1) is an extrusion molded material for a blade made of aluminum, which is extruded into a flat hollow shape with arched bulges on both sides and appropriate reinforcing ribs provided inside. After extrusion, such an extruded material 11) is subjected to a stretching process using a forming machine to correct meandering deformed portions, etc. . This stretching process is performed using the tension forming machine's clamp 7 as shown in Figure 1 and Figure 2.
Bar j2) (21 presses both ends of material (1) with pressure I'
J't and grasp the top 1 and 12 pieces.
In this invention, the material +11 is subjected to a required twisting process at the same time as the stretching process.

RIJ, this twisting process is performed by holding the material (1) with the clamper (2) (2+) for stretching process, as shown by the arrow (1') in Figure 2. By rotating one clamper (2) by a predetermined angle, the material (I) K 1t4b
This gives a twist in the f9 direction. At this time, Cura 7
It goes without saying that the rotation angle of the bar (2) is set depending on the twist angle required for the twist-molded product. For example, if a fan blade is 1300 mm long and has a twist angle of 15 degrees, the clapper
(2) is rotated by 1004 degrees around the axis of the material (1).

The above-mentioned twisting process may be performed at the same time as the stretching process, that is, by rotating the crutch bar (2) and moving it in the pulling direction, or it may be performed either before or after the predetermined stretching process. It may also be twisted. Furthermore, each processing step is divided into a plurality of steps, for example, an operation is performed in which a twisting process is performed in advance at a 1/4 angle of the total twisting angle, and then a stretching process is applied to approximately 1/4 of the total stretch length. By repeating the process four times, a predetermined amount of twisting, straining, and renotching may be finally performed. Therefore, "synchronous" as used in this specification includes any of the above-mentioned process sequences.

As a result of the above process, the stretched and twisted material (1) has its surplus parts (1aXIa) cut off at both ends, and its effective length <e> is usually cut along the cutting line (C
) is divided into a plurality of pieces to make a twist-molded product (3) such as a fan blade of a required length as shown in FIG.

In addition, when performing the above-mentioned twisting process, it is difficult to impart the desired twist to the aluminum material (1) unless it is cooled to a temperature of 40° C. or lower. Therefore, it is preferable to process at room temperature. In addition, if the length of the material (+1 σ) is longer than 15 m, it may not be possible to give the desired twist to the central part of the length, so use a material with a length of 15 m or less. It is preferable to use a tension molding machine.

In addition to manufacturing fan blades as shown in the illustrated embodiment, this invention improves the decorative appearance of the fan blades by, for example, giving a polygonal hollow pipe or a strip plate a twist in the longitudinal direction. The present invention can be similarly applied to the production of various metal sheet molded products.

As described above, this invention uses an extruded material extruded into a predetermined cross-sectional shape and twists it to obtain a desired twist-molded product. Compared to the conventional pressing method, casting method, etc., the manufacturing process is simpler and more productive, and it is possible to reduce the cost of the product. Since a shaped product can be easily produced, it is possible to obtain a lightweight, strong, and functionally superior product. In particular, since the twisting process is performed using the tension forming machine itself in synchronization with the stretching process that is essential for shaping the extruded material, the series of forming processes including the twisting process is simplified and It is possible to improve productivity and save labor.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to the manufacture of fan blades. Fig. 1 is a perspective view of an extruded material, and Fig. 2 shows the state when it is processed by a tension molding machine. A schematic side view, and FIG. 3 is a perspective view of the product. (1)... Extrusion molding material, (2)... Clamper of tension molding machine, (3)... Product. that's all

Claims (2)

[Claims] (1) Using an extrusion-molded material that has been extruded into a predetermined cross-sectional shape, when performing the required stretching process on the extrusion-molded material, at least one of the clampers of the tension molding machine gripping both ends of the material is A method for manufacturing a torsion-molded product, such as a fan blade, characterized in that a twisting process is performed synchronously with a stretching process by rotating the blade at a predetermined angle at the center. (2) Claim 1 in which the extruded material is hollow
A method for manufacturing a twist-molded product such as a fan blade as described in 2.