JP3833002B2 - Manufacturing method of exhaust vane blade for supercharger for automobile and vane blade - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust vane blade manufacturing method and a vane blade which are parts constituting a supercharger for an automobile.
[0002]
[Prior art]
Automotive superchargers are automotive parts that use the energy of exhaust gas to improve engine output performance. By installing this, it is overwhelming from the middle speed range to the high speed range compared to when it is not installed. A feeling of acceleration can be obtained. The turbocharger for automobiles has a function of driving a compressor coupled coaxially with the rotation shaft of the turbine wheel by rotating the turbine wheel at a high speed of 100,000 rpm or more by the energy of exhaust gas sent to the supercharger. It is. The vane blade is one of the components constituting the supercharger, and adjusts the output by opening and closing according to the rotational speed, and in particular, the output is improved in the low rotational speed region.
[0003]
Since vane blades open and close while being exposed to high-temperature exhaust gas, it is indispensable that the material that forms them has excellent heat resistance, and stainless steel or heat-resistant steel materials are used. . In addition, a large number of vane blades are attached to the outer peripheral portion of the turbine wheel, and since they open and close simultaneously, the coaxiality with the shaft portion and the accuracy of the blade shape are important functions.
[0004]
Therefore, the conventional manufacturing method has been manufactured by the lost wax precision casting method and the powder injection molding method (MIM method) due to its heat resistance, dimensions and shape accuracy, and finished by machining and polishing the shaft portion. It was.
Further, for a supercharger vane blade part used at a relatively low temperature, a method of forging and manufacturing an aluminum alloy is used. For example, Japanese Patent Application Laid-Open No. 61-27787 suggests that a vane holder and a vane are integrally forged from a wrought aluminum alloy material to improve the strength of both members and facilitate their manufacture. ing. This proposal is excellent in that there is no joint, but there is a problem that the problem of heat resistance cannot be solved.
[0005]
[Problems to be solved by the invention]
The above-described lost wax precision casting method and MIM manufacturing method are advantageous in creating the shape of the vane blade surface. However, in the case of integral molding with the shaft portion, casting is performed due to thermal deformation in the casting or sintering process. In the as-sintered state, the concentricity and shaft diameter between the vane blade surface and the shaft center do not satisfy the required accuracy, so that the shaft must be machined or polished, resulting in high costs. It was.
[0006]
Further, the lost wax precision casting method has a problem in that since there are defects on the product surface and inside at the time of casting, an extra sorting cost is required to guarantee the quality.
In addition, in the MIM method, since the manufacturing method sinters the powder molded product, the material strength is lower than that of general steel materials and casting materials, and in particular, the strength of the boundary portion between the blade portion and the shaft portion is insufficient. There was also a point.
The object of the present invention is to omit or simplify the finishing process of the shaft part in the stable production of exhaust vane blades in large quantities, and to solve problems such as casting defects and insufficient material strength. There is no manufacturing method and exhaust vane blade.
[0007]
[Means for Solving the Problems]
The inventors have studied the problem of material strength and mass productivity, and by adopting a method of punching out a heat-resistant metal material and then forming the exhaust vane blade part and the shaft part simultaneously by cold forging. The present inventors have found that the product cost can be greatly improved and have reached the present invention. Furthermore, the present inventors have found that accuracy can be secured by simple finishing by adding trimming press processing in the finishing process.
[0008]
That is, the present invention relates to a method of manufacturing an exhaust vane blade having a shaft portion connected to a flat blade portion, punching a metal material of stainless steel or heat-resistant steel into a T shape, and simultaneously pressing the blade portion and the shaft portion simultaneously. A method for producing an exhaust vane blade for a supercharger for an automobile, characterized by forming by cold forging with a mold. Preferably, the metal material is a plate material that is punched into a T-shape and used as a forging material. Moreover, it can also manufacture from a bar, a square, a drawing material, etc. instead of a board | plate material. Preferably, the entire press die adopts a progressive die to ensure mass productivity. A method of manufacturing an exhaust vane blade for a supercharger for an automobile, wherein after completion of cold forging by an overall press die, the edge portion of the exhaust vane blade is barrel- polished after removing burrs by trimming press processing. It is. An exhaust vane blade according to the manufacturing method described above, which is made of a metal material of stainless steel or heat-resistant steel, has a blade portion and a shaft portion that are cold- forged by an entire press die, and an edge portion of the exhaust vane blade is An exhaust vane blade for a supercharger for an automobile, which is barrel- polished.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
As described above, an important feature of the present invention is that the construction of cold forging and trimming press processing using stainless steel or heat-resistant steel material is adopted in the manufacture of the exhaust vane blade. Furthermore, it is also an important feature that the blade portion and the shaft portion of the exhaust vane blade are simultaneously cold forged by the entire press die .
[0010]
The use of cold forging improved the quality stability compared to the conventional lost wax precision casting method and MIM method. That is, it is possible to increase the stability of the manufacturing method without casting defects or powder molding defects. In addition, the molding material itself has strength, and is a stable manufacturing method without any damage caused by the defects.
[0011]
Stainless steel or heat-resistant material is a stainless steel plate specified in JIS G 4304, or a heat-resistant steel plate specified in JIS G 4312. It may be in terms of workability. Further, productivity is improved by performing a number of punching operations simultaneously using the steel plate. Cold forging further improves productivity by adopting a progressive die.
[0012]
By performing trimming press processing after completion of cold forging by the entire press die , burrs at the time of cold forging can be removed and dimensional accuracy of the vane blade tip can be ensured. In addition, fine burrs can be removed by adding barrel polishing to the finish.
[0013]
【Example】
Next, the present invention will be described in detail based on examples and drawings. In the present invention, the term “press” is used to clarify the work process, but it is a part of the cold forging process.
FIG. 1 is a process diagram showing a manufacturing method by punching the exhaust vane blade 1 and cold forging.
The product shape of the exhaust vane blade 1 includes a blade portion 1a having a blade surface of 20 mm × 7.5 mm and a maximum wall thickness of 2.5 mm, and a shaft portion 1b having an outer diameter of 4.5 mm and a length of 13 mm. As the plate material, a stainless steel plate 2 made of SUS310S as defined in JIS G 4304 was used.
[0014]
Then, it demonstrates according to process drawing.
First, a stainless steel plate 2 for supplying a cold forging material was prepared. Next, the cold forging material was manufactured by punching a T-shaped material 3 along the shape of the exhaust vane blade. In this case, although there are three example process diagrams, it is desirable to punch a plurality of them simultaneously in consideration of the entire production capacity in order to automate.
[0015]
Next, a cold forging die (not shown) is manufactured, and cold forging is sequentially performed. The implemented method prepared 4 molds and made it 4 steps. First, the wing portion-based rough press is performed (wing portion-based press product 4), and then the shaft portion-based rough press is performed (shaft portion-based press product 5). Furthermore, it was set as the process of forging to the final shape with the metal mold | die of the whole press. Also, in each process, the difference in diameter (taper) occurs in the shaft due to the large thickness difference between the wing and shaft, so the mold is made to have a reverse taper alternately to correct the taper. did. In order to further simplify the process, that is, to reduce the number of forging processes, it is an effective means to provide a thickness difference between the blade part and the shaft part in advance in the forging material. In the process diagram, burrs generated by the blade main press product 4 and the shaft main press product 5 are omitted.
[0016]
Next, the product (intermediate product) 6 in which the cold forging is completed and the burrs are generated is removed by trimming press processing. Further, the exhaust vane blade 1 was obtained by removing small burrs from the edge portions such as the blade end surface and the shaft end surface by a barrel polishing process.
[0017]
By the exhaust vane blade manufacturing method of the present invention, it is recognized that an exhaust vane blade can be manufactured that has sufficient material strength without surface and internal defects, and that can omit a finishing process such as machining or polishing of the shaft portion. It was.
[0018]
【The invention's effect】
In the production of an exhaust vane blade for a supercharger for an automobile, the production method according to the present invention is easy to automate, has a stable quality, and can omit the finishing process. The manufacturing cost can be drastically improved, and this technology is indispensable for the practical application of mass production of exhaust vane blades.
[Brief description of the drawings]
FIG. 1 is a process diagram showing an embodiment of the present invention.
[Explanation of symbols]
1: Exhaust vane blade 1a: Blade portion 1b: Shaft portion 2: Stainless steel plate (Material: SUS310S)
3: T-shaped material 4: Wing-part main pressed product 5: Shaft-main pressed product 6: Intermediate product

Claims (3)

In an exhaust vane blade manufacturing method having a shaft portion connected to a flat blade portion, a metal material of stainless steel or heat-resistant steel is punched into a T-shape, and the blade portion and the shaft portion are simultaneously cold-worked by an entire press die. The manufacturing method of the exhaust vane blade | wing for superchargers for motor vehicles characterized by shape | molding by forging. 2. The exhaust vane for a supercharger for an automobile according to claim 1, wherein after the completion of cold forging by the entire press die, the edge portion of the exhaust vane blade is barrel- polished after removing burrs by trimming press processing. A method of manufacturing a wing. An exhaust vane blade made of a metal material of stainless steel or heat-resistant steel, having a blade portion and a shaft portion that are cold- forged by an entire press die, and an edge portion of the exhaust vane blade is barrel- polished An exhaust vane blade for a supercharger for an automobile.

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