JPS6167536A - Manufacture of rotor shaft of general purpose generator - Google Patents

Abstract

PURPOSE:To manufacture in good material yield a rotor shaft consisting of parts of each different outside diameter, and having a hollow part by inserting a core bar into an inner hole of a metallic pipe, executing a forming working by heading working and upsetting pressing, and thereafter, executing serration working. CONSTITUTION:A metallic base material A of an outside diameter (a) and an inside diameter (b) is cut to prescribed length, a core bar fitted to the inside diameter (b) is inserted, an extruding pin fixed to the core bar is pushed into a die from one end of the base material A, a head part 2, a drum part 3, a middle part 4 and a fitting shaft 5 are shrunk and formed, and thereafter, both end parts are finished to a plate and a base material B is formed. The base material A is brought to heading and upsetting from the head part 2 side, therefore, in case when the material has been elongated to the fitting shaft side, it is cut at the fitting shaft 4 end. Subsequently, streaks 10 of the longitudinal direction are formed by executing serration working to the drum part 3 and the middle drum part 4, and a shaft of a general-purpose generator is manufactured in good material yield.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for manufacturing a shaft for a general-purpose generator that has recently been used for home use and for loading into automobiles.

[Conventional technology]

A conventional rotor shaft 1 has a head 2, a body 3, and a middle body 4.
Furthermore, the fitting shaft 5 part, which is made thinner than the middle body part 4 and into which a bearing is fitted like a bearing ring (not shown), is machined by cutting. In processing the /yaft 1, the body part 5
- Each of the middle body part 4 and the mating shaft 5? When cutting, it requires at least the outer diameter of the head 2 in terms of thickness, so the yield rate of H class is very low, and the price increases because processing time is wasted, and the product quality due to cutting is very low. There were drawbacks such as the inability to achieve uniformity of the On the other hand, if the head 2 is obtained from a material having the thickness of the body 3 by heading processing, it is necessary to finish cutting the thinnest fitting shaft 5 and the middle body 4. In addition, the shaft 1 is provided with a hole 6 passing through from the head 2 to the fitting shaft 5. A hole 7 and a tapered hole 8 are provided at one end of the hole 6 to fit a drive shaft (not shown).
A female thread 9 is provided on the other end of the mating shaft 5 side, and the female thread 9 is used when fitting a bearing onto the mating shaft 5, when fitting a perfectly fitted drive shaft, or when disassembling it. Although it is sometimes used, it is important for quality that the hole 6 is located in the middle of the gift 1. In other words, since a winding rotor (not shown) is fixed to the shaft 1 as a rotor shaft and rotates, if there is no hole in the center, center runout will occur, causing uneven wear on the bearing. This may cause early rattling, and the vibration also causes noise. However, its length is long compared to the diameter of the hole 6 in /Gift 1, and if the length of the hole 6 is increased by five layers, the drill will always bend to one side or the other, causing the hole to penetrate unevenly. In addition, cutting oil does not reach the drill sufficiently during hole drilling, which often causes seizure and reduces processing efficiency. In addition, in order to attach a rotor for power generation to the /Gift 1, the rotor and the /Gift 1 are fixed to each other with an insulator sandwiched between them. Knurling is provided to increase the frictional resistance, but since the rotor is formed by winding and has a comparatively small internal shape, the frictional resistance with the insulator gradually deteriorates when there are relatively shallow irregularities such as knurling. Co-circulation may occur, and co-circulation makes it impossible to use it as a generator. On the other hand, in order to fix the slide ring that contacts the slide plastic in the middle body part 4, o-lets are carved by knurling process as described above, and the slide ring is fitted and fixed. The related a-ternoyaft 1 not only serves as a shaft but also has an important mission in terms of power generation.

[Summary of the invention]

As described above, the present invention makes it possible to easily fix the insulator sandwiched between the rotor shaft and the rotor used as a general-purpose generator, and also fix the slide ring. The shaft can be manufactured at low cost by cutting a pipe material with a predetermined outer diameter and inner diameter into a certain length, inserting a core metal that fits into the inner diameter of the material, and upsetting it with heading processing. The head, body, middle body, and other end are integrally formed with a fitting shaft with a small diameter, and the hole in the head is finished by cutting into a fitting hole and a tapered hole, and at least one part of the body is finished. Manufacture of rotor shafts for general-purpose generators, in which serrations are applied in the longitudinal direction of the shaft by roll rolling on the upper and middle parts of the shaft, and the other end of the shaft that fits through the hole is machined with a female thread. The purpose is to provide a method.

[Embodiments of the invention]

The present invention will be described in detail with reference to FIGS. 1 to 5. A material A is obtained by cutting a pipe material having a constant outer diameter a and a constant inner diameter into a constant length. A core metal that fits into the inner diameter of the material A is inserted, and the extrusion pin fixed to the core metal is pushed into the die from one end of the steel material A (the extrusion pin and die are not shown in the mold), and the die is shaped. The head part 2, body part 5, middle body part 4, and low joint shaft 5 are formed so as to contract,
In particular, the head 2 is formed to be thicker than the original material.

The hole 6 is formed as a uniform hole 6 so as to fit a certain fitted core metal. One end of the head is pressed with an extrusion pin, and the other end is received within the die by a d-nok output pin, so each end becomes a flat finished material B. Now, this material A is headed from the head 2 side and upset processed, so if the material elongates on the fitting shaft 5 side and the length becomes uneven, cut it again at the fitting shaft 5 end. After fitting into the II hole 6, push it in from the +iii section 4 and insert it into the body part 3, middle body part 4, and fitting shaft 5 part t/
An extrusion bit that is upset like a goku and comes into contact with the head 2/
and the horned out pin that abuts the end of the fitting 1ull 5 to press it and correct it to a constant τj method in a plane. At this processing pressure, if there is a large difference in the outer diameter of each part, hot working is performed, and if there is not a very large difference, cold working is performed using the Bo/Plite processing method. For example, in an automobile, a shallow fitting hole 7 is formed in the head 2 of the material B, and a tapered hole 8 is formed following the hole 7 by cutting, in order to transmit the rotation of the crankshaft. It is possible to provide holes 7 and 8 at the same time during upsetting, but the accuracy of each hole 7 and 8 is stricter than that of hole 6, and if the core metal digs into the tapered hole 8 and becomes difficult to remove. In this case, the work is interrupted during the process and the core metal may break, so it is finished by cutting. Further, a female thread 9 is carved into the fitting shaft 5 at the other end. Furthermore, as shown in FIG. 5, the trunk 5 and the middle trunk 4 are provided with gear-shaped grooves that are long in the longitudinal direction of the shaft 1 so that the outer circumferential direction of the trunk 5 and the middle trunk 4 are aligned with each other. The product is completed by forming the striations 10 by performing serrations so as to bite into and protrude from the trunk 3 and middle trunk 4.

〔Effect of the invention〕

After going through the above steps, a finished product is created. The structure and fiber pattern are formed in the longitudinal direction of the yarn, which accelerates the hardening of the shaft, making the dimensions of each part uniform, and eliminating holes. It penetrates the shaft in the middle and above, and the external surface is smooth by pressing and upsetting without causing uneven thickness, and the finishing process is to form a mating hole and a tapered hole. - Since only female thread machining is required, production costs can be significantly reduced by improving material yield and shortening machining time. The striations still protrude in the longitudinal direction of the shaft and are formed in the shape of a concave groove, so even if covered with a synthetic resin like FRP, the striations will rotate/parallel to the shaft in the direction perpendicular to the shaft. Therefore, the frictional resistance is high, and the rotor and slide rig can be firmly integrated with the synthetic resin used as the insulating lamp. Then, by upsetting, the head, body, middle body, and the fitting shaft are integrally formed, and each part is successively made smaller in diameter than the head. By attaching an appropriate radius to the die, it is possible to avoid stress concentration at the step part along with the knob on the outer diameter, and this has the effect of improving the performance of the rotor 7° shaft and making it possible to manufacture it at a low cost.

[Brief explanation of the drawing]

Fig. 1 is an external side view of a rotor shaft according to the present invention, Fig. 2 is a sectional view of the same, Fig. 3 is an external side view of material A obtained by cutting it from a pipe material, and Fig. 4 is an external side view of the rotor shaft obtained from material A. The external side view before completion, tiIIS diagram, is XX in Figure 1.
FIG. 1. (Rotor) Yaft 2. Head 3. Body 4. Middle body 5. Fitting shaft 6. Hole 7.
(for mating) hole

Claims (2)

[Claims] (1) Cut a pipe material with a predetermined outer diameter and inner diameter to a certain length, insert a core metal that fits into the inner diameter of the material, and form the head, body, and middle body by upsetting and heading along with the heading process. The part and the other end are integrally formed with a fitting shaft part with a small diameter, and the hole in the head part is finished by cutting into a fitting hole and a tapered hole, and at least a part of the body part and an intermediate part are formed with a fitting shaft part with a small diameter. A method for manufacturing a rotor shaft for a general-purpose generator, characterized in that serrations are applied in the longitudinal direction of the shaft by roll rolling, and the other end of the through-hole is fitted with a female thread. (2) A pipe material with a predetermined outer diameter and inner diameter is pre-cut to a certain length, a core metal that fits into the inner diameter of the material is inserted, and the head and middle body are formed by upsetting and heading along with the heading process. and a fitting shaft part with a small diameter at the other end are integrally formed, and after adjusting and cutting the length from the head part to the fitting shaft part, the core metal is inserted into the inner diameter and the head part is inserted from the head part. Both ends are finished flat by pressing from the other end fitting shaft part which has been upholstered, and the hole in the head is finished by cutting into a fitting hole and a tapered hole, and at least a part of the body part and the middle part are finished. Manufacture of a rotor shaft for a general-purpose generator, characterized in that the body part is serrated with streaks in the longitudinal direction of the shaft by coal rolling, and the shaft part that fits at the other end of the through hole is machined with a female thread. Method.