JPH0360815A - Manufacture of twisted shape - Google Patents

Abstract

PURPOSE:To manufacture efficiently a twisted aluminum shapes of high dimensional accuracy by pushing a twisted aluminum material, lead length the of which varies and fluctuates in a shape die with prescribed twisted inside grooves in state where the material can be universally revolved in the circumferential direction. CONSTITUTION:A twisted aluminum material with variously fluctuating lead lengths, i.e., twisted shape 2 on which rugged spiral lines 1 are continuously formed is worked. In that work, after surface lubrication treatment is applied to the twisted shape 2 as necessary, the material is pushed in the shape die 4 with the prescribed twisted inside groove 3 in state where the material can be universally revolved in the circumferential direction. By this way, the twisted shapes can be supplied for requested use at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for efficiently manufacturing an aluminum-based twisted profile with excellent dimensional accuracy.

(Prior Art) Lightweight and highly accurate twisted aluminum-based (AI or ^! alloy) members are useful for members such as the rotor of a screw combiner.

Conventionally, this type of member has been manufactured by cutting a round bar material, but the material yield is poor and the work itself is inefficient. It is possible to create a twisted profile by adjusting the angle of the die bearing, the volume of the metal flow, etc. using the conventional extrusion method, but the twist pitch formed in this case is 1 to 2 revolutions per turn. m is the limit.

For this reason, a method is also known in which a shape is first extruded in a straight line and then twisted in the extrusion process or in a subsequent process to give a lead. However, even with this method, the lead length (the axial distance that one fin makes one rotation,
The accuracy of the following items has not been sufficiently improved, and is far from the level of accuracy required for screw compressor components. Therefore, in order to obtain high-precision products, it was necessary to finally perform machining such as cutting and grinding.

In order to solve these problems, the applicant inserted an aluminum profile into a die with a twisted hole,
We have developed and previously proposed a method for manufacturing a torsion shaped material, which involves rotating and moving the shape die, the aluminum shaped material, or both (Tokukou No. 1-48099).

(Problem to be Solved by the Invention) The prior art described above can perform highly detailed twisting processing through the cooperative twisting action of rotation and movement, but the processing target is linear extrusion without preliminary processing. Because it is a raw material, seizure may occur during punching, and if the rotation speed and punching speed are not precisely adjusted to force rotation, the desired lead length may not be achieved. There are some drawbacks such as not being able to obtain it.

The purpose of the present invention is to eliminate the drawbacks of the prior art and provide a method for smoothly processing and forming aluminum torsion sections with high dimensional accuracy. In addition to parts, the project aims to meet the recent demand for bridge handrail lattice materials for preventing wind resonance, which are in high demand as torsion shaped materials.

[Means for Solving the Problems] A method for manufacturing a torsion shaped material according to the present invention to achieve the above object includes freely rotating an aluminum-based torsion material whose lead length fluctuates in the circumferential direction. The structural feature is that it is pressed into a shape die having a predetermined twisted inner groove in the state.

The aluminum-based torsion shaped material to be manufactured in the present invention is, for example, a torsion shaped material 2 in which uneven spiral strips 1 are continuously formed as shown in FIG.

The aluminum-based material to be processed is an aluminum-based twisted material that has been rough-processed in advance and has a variable lead length, and the variation is obtained by twisting an extruded shape or hot extrusion using a twisted die. This applies to certain materials.

When the lead length is fluctuating, the lead length is 24.
It is preferable that it is in the range of 0 to 270 mm, and if it is out of this variation range, there is a risk that a seizure phenomenon will occur during processing.

Aluminum-based torsion materials with such variations in lead length are treated with surface lubrication as necessary, and then rotated freely in the circumferential direction to form a predetermined torsion inner groove as shown in Figure 2. It is pushed into figure die 4 which has 3. As a means to freely rotate an aluminum-based twisted material in the circumferential direction, an effective method of improving the device is to divide the receiving part of the pushing jig or shape die into two at right angles to the axial direction and construct a joint with a ball hair ring. It is true.

Die processing can be cold or cold depending on the degree of twisted lead to be formed.
This is done by selecting conditions such as cold lubrication or hot lubrication.

[Function] According to the present invention, the aluminum torsion material that has been rough-processed in advance is used as the processing object, so that the indentation proceeds smoothly.

Furthermore, since the aluminum-based twisted material rotates freely in response to the transmission of rotational force when pushed into the shape die, the resistance load during pushing is further reduced, and there is no problem even with materials with large variations in lead length. Continuous processing becomes possible.

Due to this effect, the lead length is 240 to 27
Even twisted materials that fluctuate between zero can be processed with excellent dimensional accuracy.

〔Example〕

A linear extruded material made of aluminum alloy (AA 6063) with an inner diameter of 20 nuw and an outer diameter of 201 II 11 in height and 6 fins protruding radially through a circular groove was used as the material, and the target value of lead length was 255 mm. It was set up and processed using the following process steps.

First, both ends of the extruded material were fixed and twisted to form a roughly processed twisted material with lead length variation in the axial direction. Next, the surface of the twisted material was lubricated with sodium stearate (manufactured by Nippon Parker Aji), and then it was pressed into a die having an inner groove formed with a lead length of 2551 mm for die processing. At this time, as shown in FIG. 3, the pushing-in side jig for the torsion material is constructed by integrating the pushing plate part 5 and the center part 7 of the torsion material 6 via a ball bearing 8, so that the torsion material 6 is pushed into a circular shape. It is designed to be pushed into the shape die 4 while freely rotating in the circumferential direction.

Table 1 shows the change in lead length of the torsion-shaped material die-processed in this way, in comparison with the torsion-shaped material before processing.

Table 1 From the results in Table 1, it can be seen that rough processed twisted materials with different lead lengths can be processed to the desired lead length 2 by performing the processing of the present invention.
It turns out that it has been corrected to a value close to 55wa+. However, the lead lengths are 237.881 and 278
A material with a large twist during variation of 9011I11 was unable to be processed due to seizure with the die.

Table 2 shows changes in fin cross-sectional dimensions in the treated material as measured values for the extruded material (raw material), before die processing (roughly processed twisted material), and after die processing (after processing of the present invention).

Table 2 The results in Table 2 show that once the extruded material is twisted, its dimensions change greatly, but when it is processed according to the present invention, it returns to its normal dimensions.

(Effects of the Invention) As described above, according to the present invention, an aluminium-based torsion shaped member with high dimensional accuracy can be efficiently manufactured without adding complicated mechanical processing.

Therefore, it can be supplied at low cost to all applications that require aluminum-based torsion-shaped members, such as screw compressors, screw conveyors, etc., and bridge handrail lattice materials.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a twisted profile to be manufactured by the present invention, Fig. 2 is a sectional view illustrating a shape die used in the present invention, and Fig. 3 is a twisted profile used in an embodiment of the present invention. FIG. 2 is a sectional view showing a jig.

Claims (1)

[Claims] 1. A method for manufacturing a torsion shaped material, which comprises pushing an aluminum-based torsion material whose lead length varies freely into a shape die having a predetermined torsion inner groove while freely rotating in the circumferential direction.