JPS5896101A - Manufacturing method of turbine wheel - Google Patents

Abstract

PURPOSE:To improve a turbine wheel in its weight and others by using a hollow body previously provided with a thick part on its outer end in the process of its production. CONSTITUTION:A turbine wheel 1 made of titanium alloy or other heat-resisting alloys is shaped into a hollow body with a thick part 1a and a hollow part 1b extended inward in previous preparation for the processing of a center hole 3. This turbine wheel is combined with an operation shaft 2, and the center hole 3 is processed by machinery. Then, the thick part 1a is removed, and the hollow part 1b is opened to the outside. This method permits to manufacture the turbine wheel at a light weight.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a turbine wheel in a supercharger for an engine.

Conventionally, as this breeding stock method, for example, 1st v! As shown in i, a turbine wheel a is formed by casting a titanium alloy or other heat-resistant alloy, and then it is attached to the end of the operating shaft by friction welding or other means, and then the wheel is machined to be machined. A type of wheel 1 in which a center hole 0 is machined at the outer end of the wheel 1 is known, but in this case, the wheel 1 not only does not have a hollow part inside as shown in the figure, but also has a hole in the center hole 0 in preparation for machining the center hole 0. The outer end has a longitudinally extending thick wall part d, which is relatively heavy as a whole, and this overhangs the intermediate bearing that supports the operating shaft. This situation is accompanied by the disadvantage that its operation is likely to impose a relatively large load on the bearing.

SUMMARY OF THE INVENTION The object of the present invention is to provide a method for obtaining a wheel free of such disadvantages, in which the turbine wheel is formed by casting a titanium alloy or other heat-resistant alloy and then attached to the end of the operating shaft. In the case of a type in which the wheel is joined by friction welding or other means, and then a center hole is machined in the outer end of the wheel in preparation for grinding or other machining, the wheel is attached in advance to the outer end in preparation for machining the center hole. Formed into a hollow body having a thick part and a hollow part extending in the length direction inside the thick part,
After the machining, the thick portion is removed to open the hollow portion.

An example of implementing the present invention will be explained with reference to the attached drawings.

Figures 2 and 3 show one example, and (1) shows a turbine wheel, which is made by casting titanium alloy or other heat-resistant alloy. (2) is attached to the end by friction welding, and then a center hole (3) is machined at the outer end to prepare for grinding or other machining, and this point is not particularly different from the conventional one. However, according to the present invention, the wheel (li) is
As shown in the figure, in preparation for machining the center hole (3), there is a wall thickness of 1% (1 m) at the outer end and a hollow part (
1b), and this is formed into a hollow body having the actuating shaft (1b).
21 and machined the center hole (3) at its outer end, then the thick part (1a
) is removed by cutting or other means to open the hollow part (1b) to the outside. This state is as shown in the second figure, in which (4) indicates the compressor wheel at the other end of the operating shaft (2), and (5) indicates the bearing at the middle thereof. The entire supercharger that uses this is as shown in FIG. (11
The wheel (4) is inserted into the exhaust passage (7) of the engine, and the wheel (4) is inserted into the intake passage (8).

As described above, according to the present invention, the turbine wheel is made into a hollow body having a thick walled portion at the outer end in advance, and after machining a center hole in the thick walled portion, the thick walled portion is removed. The internal hollow part is opened, so there is no problem with machining, and the wheel is extremely lightweight as a product, which does not put a large load on the bearings and allows for smooth operation. In addition, it has the effect of ensuring reliability.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the conventional example, and the 2nd FI! Figures J and 5 are explanatory diagrams of an example of the method of the present invention, and Figure 4 is a cut side view of an example of a supercharger using the product. (1)...Turbine wheel (21...Operating shaft (3)...Center hole (1a)...Thick wall part (1b)...Hollow 2 outsiders Figure 4

Claims (1)

[Claims] A turbine wheel is formed by casting a titanium alloy or other heat-resistant alloy, and then attached to the end of the operating shaft by friction welding or other means, and then a center hole is machined in the outer end of the wheel and then ground or otherwise In a type that is prepared for machining, the wheel is formed in advance into a hollow body having a thick wall portion at the outer end and a hollow portion extending in the length direction inside the wheel in preparation for machining the center hole. A method for manufacturing a turbine wheel comprising removing the thick part of a processed bale and opening the hollow part.