JPS58188531A - Manufacture of hollow stabilizer - Google Patents

Abstract

PURPOSE:To heat-treat a large quantity of material by a small equipment and to increase the efficiency of work, by hardening and tempering a straight tubular stabilizer material made of steel and then bending it to a desired shape. CONSTITUTION:A low-carbon steel pipe is mainly used for a stabilizer blank material and is hardened by quick heating and cooling such as high-frequency hardening or electrical heating hardening. By this way, sufficient hardened hardness is obtained, and at the same time, decarburization, surface roughening, adhesion of scales and coarsening of crystal grains are prevented. In a tempering stage 2, the hardened stabilizer material pipe is tempered in a straight tubular state to increase its tenacity. In a forming stage 3 it is bent to a desired shape of a stabilizer, and piercing and other mechanical workings are performed. Further, if necessary, a shot peening stage 4 is performed to improve its fatigue resisting property but this stage is sometimes omitted. Next, in a painting stage 5, it is painted and subjected to an anticorrosive treatment to obtain a product.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a stabilizer rope using arm iso material.

In the past, stabilizers used in wheel suspension mechanisms generally used solid materials, but in recent years, stabilizers using hollow materials have been developed in order to reduce the weight of vehicle bodies. To manufacture a hollow stabilizer, for example, as shown in Fig. 1, a straight tube-shaped material before heat treatment is bent in a forming process A, and then a quenching process B and a tempering process C are performed. There is. After the deformation caused by the heat treatment is corrected in a straightening step DK, a sheet beaning treatment E is performed as necessary, and a product is obtained after passing through a mounting step F1.

In the conventional manufacturing method described above, a heating furnace such as an X oil furnace, which is generally used for heat treatment of springs, is used to add phosphorus and perform G8 return treatment. It is necessary to put it in a heating furnace, which is bulky and requires large equipment, which is an obstacle to resource and energy conservation. In addition, the conventional quenching process tends to cause decarburization, surface roughness, scale formation, coarsening of crystal grains, etc., and the quality of the product may vary. Moreover, in the conventional method described above, since the heat treatment is performed after the bending process, an extra treatment called the straightening process D is required, and the manufacturing process is time-consuming.

In addition, as an alternative to the above-mentioned quenching method, as shown in FIG.
Electrode C9et connected to the power source is attached and energized to generate heat and harden. There is also a method of quenching using electrical current heating. However, since the hollow material is bent and formed, As shown, the temperature on the inside &1 (thick wall 1 it) of the bend is 11 on the outside depending on the meat *i inside and outside the bend.
150°~ compared to the temperature of Ilam (thin wall 14tl)
There is a tendency for the temperature to rise by about 200°C, and there is a problem in that the temperature becomes locally high on the inside of the bend, causing roughness of the surface skin and coarsening of the grains.

The present invention was made based on the above circumstances, and its purpose is to make it possible to open up the facilities required for heat treatment, and to be able to uniformly and high-quality heat treat the entire stabilizeripe wood, which was not required in the past. It is an object of the present invention to provide a method for manufacturing a medium-sized stabilizer tape, which eliminates the cost of a straightening process after heat treatment.

That is, the present invention is a method for manufacturing a hollow stabilizer in which a straight tube-shaped stabilizeripe material is hardened and tempered, and then the stabilizeripe material is bent into a desired shape.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. FIG. 4 shows an embodiment of the uninvented method in the order of steps. In this embodiment, first, in the quenching step 1, a tubular stabilizeripe material S made of 111I is rapidly heated and quenched. This quenching process is carried out by - For example, as shown in FIG.
Alternatively, a direct current heating hardening method may be used in which electricity is passed between the electrodes 11 and 11 to rapidly heat and then rapidly cool the wood surface. It is also possible to perform quenching. The above-mentioned stabilizer ribbon material S is mainly a low carbon flat ribbon, for example STKM 13' (C=0
．． 25% or less) or tit STKM15' (C=
0.25 to 0.35%), etc., and even when such low carbon steel is used, rapid heating/cooling quenching treatment such as induction quenching or electric heating quenching as described above must be performed. This makes it possible to obtain a quenching hardness that is suitable for practical use as stabilizer tape.

In addition, since the above-mentioned quenching method uses rapid heating, it eliminates decarburization, roughening of the surface, adhesion of scale, coarsening of crystal grains, etc. that were often problems with conventional methods9, and high quality products can be obtained. There is an advantage.

Then, a tempering step 2 is performed. In this tempering process, the IL tube-shaped stabilizer strip material s that has been hardened as described above is
1 is tempered as a straight pipe to increase the toughness t. Then, in topography process 3, the curve is formed into the stabilizeripe shape of I9r\ji, and drilling and other mechanical processing are performed.

If necessary, a shot peening step 4 is performed to improve fatigue resistance, but this step can be omitted or removed for Stabilipe citrons. Next, painting process 5
The product is then subjected to m-packing and anti-corrosion treatment.

When a fatigue life test was conducted on the stabilizer rope manufactured by the above method, the results shown by the black circles in FIG. 6 were obtained. This prototype was made of STKM15 No. 9 iso material, which was subjected to the above-mentioned direct current heating and quenching, H, C = 3.
It is made of gold with a hardness of 6 to 38.

In this Fig. 6, the area P where fp+1i1il is applied
shows the fatigue strength level of the stabilizer manufactured using the conventional method (the curve is molded and then energized and quenched). Since we decided to harden the pipe as it is and then process the curve, it became important to make the quality of the S part uniform as it is used as a stabilizer and is subjected to stress-friendly conditions, so we decided to use the conventional method. It can be seen that a high quality stabilizer line with less flaking can be obtained.

As mentioned above, the method of the present invention is suitable for straight pipe-shaped wood! In addition, since heat treatment is applied, the heat treatment equipment can be simplified compared to the conventional case where the product after bending is put in a furnace for heat treatment, and even with small equipment, a large amount of wood can be processed. heat treatment can be performed at once, greatly improving work efficiency.

In addition, since the bamboo is quenched as is, the entire wood can be quenched homogeneously, and especially when electric heat quenching is applied, there is no variation in quenching quality in the curved parts, as in the case of ferried rice. This is particularly effective since there is no risk of this occurring.

In addition, according to the present invention, since the curve is processed after heat treatment, there is no need for a straightening process after heat treatment, which is required in the conventional case where heat treatment is performed after machining kCB, and the process can be simplified. It has a big effect.

[Brief explanation of the drawing]

Figure 1 shows the conventional manufacturing method step by step! rock diagram, w
Figure J2 is a schematic diagram showing a conventional energization heating method, and Figure 3 is a sectional view of the curved part of the stabilizer rope. . Fig. 4 is a schematic diagram showing an original example of the method of the present invention in the order of steps, Fig. 5 is a schematic diagram showing the electric heating quenching used in the present invention, and Fig. 6 is a diagram showing the fatigue life of the stabilizer. be. S,... Stabilizer wood 0

Claims (2)

[Claims] (1) [A method for producing a hollow stabilizer pipe, which comprises subjecting a tubular steel stabilizer pipe material to quenching and tempering treatment, and then bending the stabilizer pipe material to form it into a desired shape. (2) The above-mentioned quenching treatment is carried out by a high-sensitivity wave quenching method - A method for manufacturing a hollow stabilizer pipe described in Patent No. 11 (3) The above-mentioned quenching treatment is carried out by a direct current heating quenching method. A method for manufacturing a hollow stabilizer rope according to claim 12, characterized by: