Method of processing rod

Details Method of processing rod Method of processing rod

1992-10-15

1994-04-26

Lusignan, Michael

Coating processes

Nonuniform coating

Applying superposed diverse coatings or coating a coated base

205122, 205210, 205222, 427270, 427271, 427304, 427307, 4274431, B05D 132, B05D 136, B05D 500

Patent

active

053065255

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a method of processing the surface of a metallic rod and is particularly effectively adapted for making grooves on the surface of the metallic rod so as to form patterns thereon (circular grooves, straight grooves, and other various shaped grooves) which are used for a marking and a scale representing the position of the metallic rod of industrial machines and a decoration thereof.
The present invention also relates to a method of plating and polishing grooves after the making of the grooves on the surface of the metallic rod and is adapted for processing patterns which are used for a mark, a scale etc. of industrial machines, industrial vehicles, construction machines, etc.


BACKGROUND TECHNOLOGY

Machining (lathe turning or milling) has been conventionally employed as a method of patterning or making grooves on the surface of a metallic rod.
However, the metallic rod usually has a curved portion which is enlarged when the curved portion is subjected to a heat treatment etc.
Furthermore, since the rod is not always perfectly circular in its cross section but it may be elliptical or eccentric, machining such rods, heavy rods and long rods, uniforming the depth of the grooves and processing the rod with high accuracy are difficult, which involves high cost.
The present invention has improved the drawback of the conventional processing method and is to provide a method of processing the rod capable of forming patterns of very shallow grooves on the surface of the rod etc. with ease and high accuracy.


DISCLOSURE OF THE INVENTION

The present invention has been made to solve the problems set forth above and comprises the steps of forming coating films having necessary shapes on the surface of the rod and then removing the coating films on the necessary portion where the patterns are formed in the necessary shape or on the portions other than the necessary portion so as to print the patterns, by a photoresist method, a tape masking method or a screen printing method.
Furthermore, it is possible to make the patterns of shallow grooves on the surface of the rod by subjecting the surface of the rod having no coating films thereon to a chemical polishing or etching for dissolving and processing the same.
The photoresist is a material for forming a chemical-resistant coating film, and particularly an insoluble hard coating film which is formed of gelatin or polyvinyl alcohol including dichromate, diazo compound.
The tape masking method is to wind a tape on the surface of the rod. The tape is formed of a material which is not removed by the etching.
The screen printing method is to print a screen, which is for use in photoengraving, on the surface of the rod.
Still furthermore, according to the present invention, the circular or the straight grooves or the grooves having various shapes are formed respectively on the surface of the rod by applying the films onto the portion other than the necessary shape where the grooves are to be formed on the surface of the rod by the photoresist method, the tape masking method or the screen printing method. Thereafter, the surface of the rod is plated in a state of being coated by photoresist films or screens whereby the grooves or the recessed portions are plated. Thereafter, the coating films are removed by buffing and the like and the plated surface is finished, thus the number of steps of processes are reduced and the plating quality is improved.
Since the grooves and the recessed portions are double plated by plating the surface of the rod, the rust preventive effect can be improved, particularly, when a hard chromium plating is made on the surface of the rod.


BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1(a) and 1(b); FIGS. 2(a) and 2(b); FIGS. 3(a) and 3(b); FIGS. 4(a) and 4(b) show respectively a method of processing a rod by a photoresist method, FIGS. 5(a) and 5(b); FIGS. 6(a) and 6(b); FIGS. 7(a) and 7(b) show respectively a method of processing a rod by a tape masking method and FIGS. 8(a) and (b) and FIGS. 9(a) and (b

REFERENCES:
patent: 2847370 (1958-08-01), Howard et al.
patent: 5141623 (1992-08-01), Cohen et al.
patent: 5199487 (1993-04-01), DiFrancesco et al.

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