JPH04101730A - Manufacture of motor shaft for toy - Google Patents

Abstract

PURPOSE:To improve the working efficiency and largely reduce the manufacturing cost by continuously forming anti-corrosion coating on the surface of a metallic linear body for continuous cutting, and performing finishing work by means of barrel polishing. CONSTITUTION:A metallic linear body 1 collected in the form of a coil bundle is delivered from a delivery machine 2, bending is removed by a correcting device 3, heat treatment is performed through a heat treatment furnace 4 to desired hardness. Then, pre-treatment, such as electrolytic pickling, alkali cleaning, washing, is carried out in a pre-treatment bath 5, a corrosion resistant coating film is formed in a plating bath 6, and the processed part is cut to a desired length by a cutting machine 7 to make a cut shaft 8. Besides, a finish polishing process is applied to the edge surface and the surface of the cut shaft 8 by a barrel polishing device 9 to obtain a motor shaft 10 for toy. It is thus possible to obviate transportation and work between the respective processes, and devices between the respective processes are obviated, and further the working efficiency is largely improved while the manufacturing cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a relatively inexpensive method of manufacturing a motor shaft for a toy, the shaft surface of which is coated with a rust-preventing coating.

[Conventional technology]

The outline of the general manufacturing method for motor shafts is as shown in Fig. 2, in which metal wires (1
) and the feeding machine (2), the straightening device (3) removes the bending of the filament body (1) and straightens it, and then the cutting machine (cutting machine) cuts it to the desired length to form a cutting shaft. (8)
becomes.

Next, this cutting shaft (8) is subjected to heat treatment in a heat treatment furnace (4) to impart desired hardness, and then the end face is polished by a barrel polisher (9), an end face grinder I, a centerless grinder @, etc. A motor shaft a3 was obtained by surface polishing.

In the method for manufacturing the motor shaft mentioned above, stainless steel was used for the metal filament (1) for the purpose of rust prevention, but in the case of motor shafts for toys, it is more important to make it cheaper than to improve accuracy. In response to this demand, in recent years, carbon steel has been subjected to straightening, cutting, heat treatment, and polishing processes, and then a rust-preventing coating of nickel, zinc, etc. is formed thereon.

[Problem to be solved by the invention]

However, in the above manufacturing method, the metal filament (1
) is cut to form the cutting shaft (8), and then an anti-rust coating is applied, so each process cannot be carried out in series, and transportation and work between each process requires manual or specialized labor. This required equipment, making it difficult to reduce product costs.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for manufacturing a motor shaft for a toy, which makes it possible to improve work efficiency and significantly reduce manufacturing costs.

[Means to solve the problem]

In order to achieve the above object, the method for manufacturing a toy motor shaft of the present invention provides a method for manufacturing a toy motor shaft according to the present invention.

A rust-preventive coating is formed continuously over the length of the metal wire on the surface of the metal wire that has been imparted with straightness and hardness, and then the wire is continuously cut along the length. After the cutting shaft is made into a cutting shaft, the cutting shaft is finished by barrel polishing.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a schematic process diagram showing the outline of the manufacturing method of the present invention. In the figure, a metal wire body (1) bundled into a coil bundle is fed out from a feeding machine (2), and a straightening device (3) is fed out from a feeding machine (2). ), the curvature of the striatum (1) is removed and straightness is imparted,
It is heat treated to a desired hardness through a heat treatment furnace (4) consisting of a heating furnace and a tempering furnace.

Thereafter, it is pretreated in a pretreatment tank (5) such as electrolytic acid cleaning, alkaline cleaning, and water washing, a rust-preventive coating is formed in a plating tank (6), and it is cut into a desired length by a cutting machine (7). It becomes a cutting shaft (8).

After the series of steps described above, the cutting shaft (8) was subjected to finishing polishing of the ground and surface using a barrel polishing device (9) to obtain a toy motor shaft a.

To explain the above embodiment in more detail, a wire body made of carbon steel and having a wire diameter zOran φ is straightened vertically and horizontally by a straightening device (3) consisting of rollers arranged in a staggered manner with the wire axis of the wire body in between. Straighten it to give it straightness. Next, this striatum was heat-treated to lv==450, and then subjected to plating pretreatment, and thiourea 10g/PH4 bath temperature 40
Cut continuously at "C current density 10-70 A/dm". After that, this large number of cut shafts (8
) was barrel-polished to remove burr when cutting, and a toy motor shaft was obtained.

Incidentally, although the above-mentioned toy motor shaft does not have an anti-rust coating applied to the cut surface, the growth of rust can be suppressed by the coating around Ii of the shaft, and there is no problem in use as this kind of toy layer motor shaft. There is no problem.

Electrogalvanizing in the above examples was carried out under the following conditions.

(Plating bath conditions) Zinc sulfate 350 g #' Ammonium sulfate 30 g/l Not limited to these, nickel and other metals may also be used.

In addition, in the examples, the desired hardness was imparted by heat treatment, but it is also possible to impart the desired hardness by making the diameter of the filament to be supplied larger than the diameter of the final product and drawing it. It is possible.

〔Effect of the invention〕

According to the method for manufacturing a toy motor shaft of the present invention, each process from imparting straightness, imparting hardness, anti-rust coating, and cutting can be performed continuously under a series of steps, and transportation between each process is possible. Since this method does not require additional work and does not require any work-in-progress between each process, work efficiency is significantly improved and product costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic process diagram showing one embodiment of the method for manufacturing a toy motor shaft of the present invention, and FIG. 2 is a schematic process diagram showing a conventional general method for manufacturing a motor shaft. (1)・・・Metal filament (2)・・・・・・
・Feeding machine (3)...Correcting device (4)・
...Heat treatment furnace (5) ...Pretreatment tank
(6)...Plating tank (η...Cutting machine (8)...Cutting shaft (9)...
... Barrel polishing device αQ ... Toy motor shaft wholesale ...
End face grinder @... Centerless grinder α...
...Motor shaft

Claims (1)

[Claims] A rust-preventive coating is continuously formed on the surface of a metal filament that has been given the required outer diameter, straightness, and hardness, and then this filament is continuously cut along its length to form a cutting shaft. After that, the cut shaft is finished by barrel polishing.