JPH01154801A - Method for rolling and forming replaceable blade stock - Google Patents

Abstract

PURPOSE:To prevent generation of burrs at cutting and to obtain a stock for replaceable blades capable of being easily ground by passing through a coil stock between upper and lower forming rolls whose peripheral surface has the proper number of projected ribs and rolling and forming separation boundary parts and a profile of the blade edge. CONSTITUTION:A coil stock is passed through a couple of upper and lower forming rolls 1, 2 whose peripheral surface has the proper number of projected ribs 3 before replaceable blade stocks are separated and worked from the coil stock of a cold rolling formed steel sheet and the proper number of recessed rib parts 7 in the width direction are continuously reducibly formed in the length direction of the surface of the coil stock. The parts 7 have a very thin part of a separation boundary part of a stock K for replaceable blades and are also formed so that the sectional shape is a profile of a blade edge where a thickness gradually increases toward both sides of the boundary. Hence, the blade stock K is easily cut without generation of burrs from the very thin parts and grinding work of a blade edge is facilitated. Further, a physical property of the blade edge is improved by the above reducibly working.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) This invention is directed to the processing of dividing a coil of cold-rolled steel sheet obtained from a strip mill into strips for use in disposable blades or other materials. In addition to being free from the risk of easy paring, the profile of the tip of each replacement blade can be formed on the width side edge at the same time, and the physical properties of the blade can be improved. The present invention relates to a method of rolling and forming a steel strip for use as a replacement blade for a safety razor.

(Prior technology) Conventionally, materials for replaceable blades are made by dividing (slitting) coil material of cold-rolled steel obtained from a strip mill and cutting it continuously into an appropriate number of rows in the width direction to a predetermined width using a gang slitter or the like to form the material. A method has been taken to do so. For example, in the case of safety razor blade materials, in order to finish the blade to a thickness of about 0.1 to 0.2 millimeters, hot-rolled thin sheets are annealed and then cold-rolled using forming rolls, and then slitter-formed. Cut into a very long tape to the required blade width. At this time, the cut surface is approximately 90 mm away from the surface in contact with the aforementioned rolled cut surface.
intersect each other. The thus manufactured steel strips for replacement blades of safety razors are punched one by one into arbitrary shapes using a press machine (pressing process), and are heat treated to give them the hardness and toughness necessary for safety razors (heat treatment process). Next, the cutting edge is ground using an appropriately placed grinding wheel to form a sharp cutting edge of the replacement blade (blade-setting process).

Fig. 5 shows that the cutting edge S of the spare blade material is set on the cutting edge E side and is removed by grinding when the width side edge W is ground by the grinding wheel G as shown in Fig. 6 in order to form the profile P of the cutting edge of the spare blade. The volume V to be processed is large, and the grinding wheel G is severely consumed. Furthermore, as shown in FIG. 7, the cutting edge S by the slitter is cut by the upper and lower cutters TI, T! Further grinding work is performed because it is impossible to avoid the occurrence of paris B in the circle shown by the imaginary line due to the wear of the cutters T + and T 2 on the end face of the cutting edge S that is sheared between the cutting edge e of the blade. It had become inevitable. Incidentally, when grinding a curved cutting edge, productivity is hindered even more than when grinding a straight cutting edge, and the grinding wheel wears out more rapidly, making the problem more serious.

Furthermore, no rolling forming method has been developed in which a means for eliminating the waste of these grinding operations is added in the cold rolling process.

(Problems to be Solved by the Invention) This invention is directed to the removal of the burr that occurs on the width edges of the above-mentioned materials for disposable blades, and the grinding work to form the profile of the tip of each blade on the width side edges. In view of the fact that the problem of a large amount of processing time and unavoidable wear of the polishing wheel remains, we have solved this problem in the rolling forming process of disposable blade materials, and we have developed a physical The purpose of this study is to develop a rolling forming method for disposable blade materials that can further improve the mechanical properties.

(Means for Solving the Problems) The present invention provides, as a means for solving the above-mentioned problems, protrusions formed in a wavy curved shape on a forming roll at intervals of the required blade width in the longitudinal direction of the forming roll. When the hot-rolled thin plate is cold-rolled with a forming roll after annealing, the thin plate is drawn by the above-mentioned convex stripes, and then the concave strips are drawn. A very elongated tape-shaped replaceable blade material can be obtained by cutting the dividing boundary part that forms the deepest part of the part using a gang slitter. When this rolling method is used, the protrusions provided around the roll surface can be easily formed not only in a wavy curved shape but also in a straight line, so that it is possible to obtain a replaceable blade material having an arbitrary cutting edge.

(Function) The functions and effects of the rolling forming method for disposable blade materials of the present invention are as follows: First, a forming roll process for drawing and forming the disposable blade material is added to the rolling process of a cold rolled steel plate using a cold strip mill. An extremely thin wall is formed at the dividing boundary, and there is little risk of fracturing when cutting with a slitter.In addition, the profile of each replacement blade is drawn at the same time on the width side edge, and at that time, the profile is drawn at the same time by work hardening due to cold rolling. The physical properties of the tip of each blade are improved.

The cutting edge of the disposable blade material drawn and formed by the above-mentioned forming roll has an extremely small volume of the part to be ground by the grinding wheel, which saves a lot of processing time and also reduces the wear and tear of the grinding wheel. The effect is great. In particular, when grinding a cutting edge with a curved cutting edge, the effect of improving productivity and eliminating wear on the grinding wheel is greater than when grinding a straight cutting edge.

(Example) Embodiments of this invention will be described below based on the drawings.

FIG. 1 shows Example 1 of a pair of upper and lower forming rolls 1 and 2 used in the method of rolling and forming disposable blade materials of the present invention, in FIGS. (A) and (B). Both are provided with an appropriate number of rows of protrusions 3 on the roll surface in the longitudinal direction, and the intervals between the protrusions 3 are formed so as to obtain a predetermined width required for the replaceable blade material K. For example, as shown in FIG. b) As shown in the figure, from the center line XX of the convex strip 3 perpendicular to the axial direction of the forming rolls 1 and 2, move the flat part 4 of the blade edge E and the profile P of the blade edge to the width side to the radius length necessary for the blade width. Slanted portions 5 that can be formed on the edge W are formed on both sides facing the center line XX. At this time, the forming center line YY (dividing boundary line of the curved grooved part) which meanders in a wavy curve shape on both left and right sides in the axial direction with respect to the center line XX of the convex part is set on the roll surface of the forming rolls 1 and 2. The rolling contact points are provided so as to coincide with each other, and wavy curved grooves are formed on both opposing sides by rolling. (b) The figure shows upper roll 1
The lower rolls 2 corresponding to the lower rolls 2 are provided so that they can be installed in parallel on a rolling machine with a required roll interval d. The protruding stripes 3 of the lower roll 2 are formed at positions corresponding to the protruding stripes 3 of the upper roll 1, and the parts are divided into replaceable blade materials that are rolled and formed at predetermined positions of the drawing rolls 1 and 2 between the two. The cross-sectional shape of the concave strip 3 drawn at the boundary portion 6 is gradually increased in material thickness from the parallel portion 4 to both sides facing each other with respect to the dividing boundary line XX (the center line of the convex strip of the forming roll). This figure shows a cross-sectional shape in which the profile P of the cutting edge is formed on the width side edge W thereof. An extremely thin portion is formed at the division boundary line XX within the circle C shown by the imaginary line, and can be easily cut with a slitter, thereby minimizing the occurrence of paris. FIG. 3 shows the step of forming the dividing boundary line portion 6 in the replaceable blade material by rolling the above-mentioned upper and lower forming rolls 1.2 and continuously drawing the concave portions 7 in appropriate number rows in the width direction of the coil material. This shows that. Convex strips 3 provided around the surface of the forming roll 1.2
The wavy curved concave portion 7 explained in FIG. 2 is formed by rolling.

FIG. 4 shows a second embodiment in which the shape of the protruding strip 3a provided around the roll surface is linear with an arcuate cross section. The cross-sectional shape is the division boundary line XX of the coil material or the forming center line Y
The protruding portion 3 may have any shape in which the wall thickness is the minimum at Y.

In addition, since the above-mentioned convex stripes 3 are all formed in a wavy curved shape perpendicular to the axial direction of the forming roll 1.2, the blade edge of the replaceable blade is formed into a curved blade edge E. The convex portions 3 of the forming rolls 1 and 2 are circumferentially arranged in a straight line with respect to the center line XX of the forming rolls 1 and 2, and a straight cutting edge is formed in the replaceable blade material K as shown in FIG. 8 of Example 3. is even more easily possible. Further, in rolling forming a material for a replaceable blade for a single-edged knife, the protruding strip 3 may be provided only on either the upper or lower side of the pair of upper and lower forming rolls 1 and 2. (Drawings omitted) [Effects of the Invention] Since the present invention has the above-described configuration, it has the following advantages.

(1) The profile of the blade tip of the replaceable blade is drawn on the width side edge of the replaceable blade material by the protruding strips provided around the forming roll, and the ultra-thin part formed at the deepest part can be divided using a slitter. When grinding the cutting edge to the cutting edge,
In addition to preventing the occurrence of burr as much as possible, it also saves a lot of processing time and wear and tear on the grinding wheel during grinding work to form the profile of the cutting edge, contributing to improved workability and cost reduction. Particularly, when grinding a replaceable blade having an irregularly shaped curved blade used in a medical scalpel or the like, the effect is great, and in the case of a straight blade, grinding becomes even easier.

(2) In addition, the physical properties of the cutting edge can be further improved by work hardening through drawing through rolling.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the external shape of the forming roll of Example 1 used in the rolling forming method of disposable blade materials of the present invention, (a) is a plan view of the upper roll, (b) is a plan view of the lower roll, and (b) is a plan view of the lower roll. The figure is a sectional view illustrating the forming part of the disposable blade material that is drawn by the convex stripes of the forming roll, Figure 3 is a perspective view illustrating rolling forming by the forming roll, and Figure 4 is the installation of a pair of upper and lower forming rolls in Example 2. An explanatory plan view, Fig. 5 is a partial sectional view illustrating the formation of a cutting edge on the width side edge of a conventional disposable blade material, Fig. 6 is a front view illustrating a method for polishing the cutting edge of a conventional disposable blade material, and Fig. 7 is a conventional disposable blade. FIG. 8 is an explanatory cross-sectional view of the cut surface of the material, and FIG. 8 is an explanatory plan view of the outer shape of a pair of upper and lower forming rolls for a straight blade according to the third embodiment. (Explanation of symbols of main parts) 1... Forming roll (upper side) 2... Forming roll (lower side) 3... Convex strip portion 6... Division boundary portion 7...
Recessed part K...Replaceable blade material XX...Division boundary line (straight) YY...Division boundary line (curved) P...Blade edge profile Figure 1 Figure 8 Procedure amendment (method) % formula %) 1. Indication of the case 1988 Special '/aR No. 31+2782, No. 2, Title of the invention Rolling forming method for disposable blade material 3, Person making the amendment Relationship with the case Patent applicant 4, Agent Address: 3-5-6 Kano Asahi-cho, Gifu City, 500 Japan Number of inventions to be increased by amendment

Claims (1)

[Claims] Before dividing the roll-formed cold-rolled steel sheet coil material into spare blade material, a suitable number of rows of grooves are continuously drawn in the longitudinal direction of the plane of the coil material in the width direction of the coil to form the replaceable blade material. At the same time, the cross-sectional shape of the concave groove is gradually increased in material thickness to both sides facing each other with respect to the dividing boundary line, and the profile of the blade tip of the replaceable blade is simultaneously formed on the width side edge of the replaceable blade material. 1. A method of rolling forming a material for a replaceable blade, comprising rolling through a pair of upper and lower forming rolls having an appropriate number of rows of strips circumferentially arranged on the roll surface.