JPS587341B2 - Manufacturing method of grain milling trochanter shaft - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a grain milling trochanter shaft.

Figure 1 shows a conventional grain milling trochanter shaft, which is made by cutting a round steel in half, drilling a hollow part 9 and a ventilation hole 2 in each half, and drilling the hollow part 9 and ventilation hole 2 in each part, and cutting the other part on the side of the shaft. 4, 5 and the shaft circumferential surface are cut and then the cut sections are welded, so
This method has disadvantages such as a large number of holes, which requires a long machining time, and a large amount of material is lost due to scraping.

The present invention focuses on these drawbacks and makes improvements.
The object of the present invention is to provide a method for manufacturing grain milling trochanter shafts that can be manufactured continuously and in large quantities, with little loss of material, and which is easy to process and takes a short time.

In order to achieve this purpose, the method for manufacturing a grain milling trochanter shaft of the present invention involves drilling a large number of holes in an iron plate to form a perforated iron plate, and then winding this perforated iron plate into a cylindrical shape to form a hollow shaft. On the other hand, two side shafts each having an annular projection formed by drilling a hole in one end surface are manufactured, and the end surfaces of the annular projection of the side shaft are friction welded to both end surfaces of the hollow shaft body. It is characterized by

This invention will be explained with reference to an embodiment. In FIG. 3, reference numeral 1 denotes a perforated iron plate in which ventilation holes 2 of a predetermined size are punched into the iron plate.

The perforated iron plate 1 is wound into a cylindrical shape as shown in FIG. 4 by press molding or the like, and the joint portion 3 is welded without any gap to form the hollow shaft body β.

Reference numeral 4 designates one side shaft, the circumferential surface of which is cut in a predetermined manner, and one end surface is bored to form an annular protrusion 5.

Reference numeral 6 denotes the other side shaft, which is provided with a predetermined cutting process and an annular protrusion 7 on one end surface.

The hollow shaft body 8 and both side shafts 4 and 6 are manufactured through this process, and the annular projections 5 and 7 of the side shafts are formed on both end surfaces of the shaft body 8.
The end faces of the grain milling trochanter shafts are joined, and the joints are welded and friction welded to create coaxial grain milling trochanter shafts.

The grain milling trochanter shaft produced by the above operations is shown in Fig. 2. Since the perforated iron plate 1 is made by punching a flat steel, it can be manufactured in large quantities continuously, and The press forming of the iron plate 1 into a cylindrical shape can be performed continuously, and at the same time, the welding of the joint portion 3 can be performed simply and continuously.

Furthermore, the loss of material removed in this process is extremely small, and the annular protrusions on both side shafts are also short and short, making processing easy.

As described above, the method for manufacturing the grain milling trochanter shaft of the present invention involves drilling a large number of holes in an iron plate to form a perforated iron plate, and then winding this perforated iron plate into a cylindrical shape to form a hollow shaft. On the other hand, two side shafts each having an annular projection formed by drilling a hole in one end surface are manufactured, and the end surfaces of the annular projection of the side shaft are friction welded to both end surfaces of the hollow shaft body. Because of this feature, the material for the hollow shaft body with ventilation holes can be obtained by a single process of punching and shearing flat steel, making it easy to process, continuous work is possible, and it can be made from round steel. The length of the shafts on both sides can be made as short as possible, and the hollow shaft body can be supported firmly by bearings.The shafts on both sides have a hole drilled on one end surface to form an annular projection, so that the annular projection can be When friction welding the end face and the end face of the hollow shaft body, both welded parts melt at the same time, ensuring reliable welding, and the materials are inexpensive, so it has practical effects such as realizing a significant cost reduction. It is.

It goes without saying that the present invention is not limited to the above embodiments, and can be modified as appropriate within the scope of the invention.

[Brief explanation of drawings]

FIG. 1 is a side view of a conventional grain milling trochanter shaft, FIG. 2 is a side view of a grain milling trochanter shaft obtained by the present invention, FIG. 3 is a side view of main parts of the material of the present invention, and FIG. The figure is a sectional view of the main part of FIG. 2. 1...Perforated iron plate, 2...Vent hole, 3.
...Continuation part, 4...Side axis, 5...
...Annular projection, 6... Lateral axis, 7...
Annular projection, 8...Hollow shaft body, 9...Hairy cylinder part.

Claims (1)

[Claims] 1 A perforated iron plate was formed by drilling a large number of holes in an iron plate, and then this perforated iron plate was wound into a cylindrical shape to form a hollow shaft body, and one end surface was bored to form an annular protrusion. A method for manufacturing a grain milling trochanter shaft, characterized in that two side shafts are manufactured, and the annular projection end surfaces of the side shafts are friction welded to both end surfaces of the hollow shaft body.