JPH04319033A - Inner groove key and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve the workability of an inner groove key having a key mountain in the middle part of a key way. CONSTITUTION:The key is composed of a base plate 1 and laminated board 2 laminated on both its sides and an inner groove 4a composing each key mountain 4 is formed by piercing the laminated board 2 through pressing or laser beam machining and the laminated boards 2 are joined to both sides of the base plate 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner groove key having a key thread in the center of the keyway, and a method for manufacturing the same.

0002

[Prior Art] Conventionally, for example, car keys have key threads on both sides of the keyway (outer thread keys).
A keyway is provided in which bottomed grooves are formed in the center of both sides and the side walls of the grooves are used as key ridges (inner groove keys). Inner groove keys have advantages over outer groove keys in that they give a more luxurious feel and are easier to insert into the key cylinder, but they also have the problem that it takes time to form the key ridge and is expensive. Because of this, it is not used much.

[0003] This problem is caused by the following difference in manufacturing method between the two. First, for Toyama Key, after forming a plate material of about 3 mm into a key shape, a mold 60 having a slope 60a at the tip as shown in FIG. 1(a) is used, and the position of this mold 60 is ) is sequentially changed as shown by the imaginary line, and the key way 61 is punched out using a press, thereby efficiently forming a key mountain of a desired shape. On the other hand, with internal groove keys, it is impossible to completely cut out the central part of the keyway using such a mold, so it is generally not possible to completely remove the central part of the keyway after forming the plate material into the shape of the key. A groove is formed in the center of both sides of the keyway using a tool such as an end mill, thereby cutting out the key thread. Since a relatively hard material is used for the plate material to ensure the strength of the key, this method requires a considerable amount of time to cut. The frequency of replacement increases and the cost increases.

0004

Problems to be Solved by the Invention As described above, since the workability of the inner groove key is not very good, there has been a desire for a method of forming the key thread with the same efficiency as that of the outer groove key. therefore,
A technical problem to be solved by the present invention is to improve the workability of an internal groove key.

[0005]

[Means for Solving the Problems, Actions and Effects] In order to solve the above-mentioned technical problems, the inner groove key according to the present invention is constructed as follows. That is, it is composed of a key-shaped substrate and a laminated plate that is bonded to both sides of the substrate and has an inner groove that forms a key thread passing through the center of the keyway. The manufacturing of this key consists of a first step of forming a key-shaped substrate, a second step of forming a laminate of a shape corresponding to this substrate and an inner groove passing through the keyway of the laminate, and a second step of forming a laminate with a keyway. The third step is to laminate the plates on both sides of the substrate.

[0006] In this configuration, since the key has a three-layer structure, the inner groove penetrating the laminate can be formed by press processing or laser processing to form the key peak, so the key peak can be formed by cutting. The processing efficiency is improved compared to the conventional one. Furthermore, since the inner groove passes through the laminate, the strength of the laminate itself is reduced, but by joining the laminate to the substrate in the third step, sufficient strength as a key can be obtained. Further, since the key has a three-layer structure, design effects can be obtained by changing the color tone of each material.

In the above configuration, a plurality of substrates are continuously formed in the first step, and a plurality of laminates are continuously formed in the second step, and different key peaks to be formed for each laminate are formed. A plurality of punching units equipped with punches and dies corresponding to the shapes are sent to predetermined positions according to each laminate and pressed to continuously form inner grooves of different shapes, and in the third step, these Preferably, the key is formed continuously by bonding the substrate and the laminate.

[0008] With this structure, the substrate and the laminate plates each having a different key ridge shape are successively formed, and the substrate and the laminate plates are successively joined to form a key. Therefore, keys can be manufactured very efficiently.

[0009]

[Example] Below, the first embodiment of the present invention shown in FIGS. 2 to 4 will be explained.
A method of manufacturing an inner groove key according to an embodiment will be described in detail.

In the method of this embodiment, as shown in FIG.
A key is formed by bonding laminated plates 2 having a shape corresponding to the substrate 1 to both sides of the substrate 1. The substrate 1 and the laminated plates 2 are each formed by laser processing a stainless steel plate, and the inner groove 4a forming the key thread 4 is formed to pass through each laminated plate 2. . In order to bond the substrate 1 and the laminate 2 to each other, a bonding layer containing solder is formed on the surface of the laminate 2 on the substrate side 1.
This is done by superposing the laminate plate 2 on both sides of the plate and heating it. FIG. 3 shows a state in which the substrate 1 and the laminate 2 are joined. As shown in FIG. 4, a knob 5 is formed on the head of the substrate 1 and the laminated plate 2 joined together by resin molding, and the manufacture of the key is completed.

As described above, the key of this embodiment has a three-layer structure in which the laminate plates 2 are bonded to both sides of the substrate 1. Since the inner groove 4a passes through the keyway of the laminate 2,
Although the strength of the laminate 2 alone is reduced, after the laminate 1 is bonded to the substrate 1, a key with sufficient strength can be obtained. Furthermore, in this method, productivity is improved by applying laser processing, and complex key ridge shapes can be easily handled. Furthermore, since it has a three-layer structure, you can create a design effect by changing the color tone in each layer.

Next, a second embodiment shown in FIGS. 5 to 11 will be explained. FIG. 5 is a diagram showing the process of forming the substrate. In this embodiment, the substrate is formed by subjecting the steel strip 10, which is fed along the longitudinal direction at a predetermined pitch, to each of the processes shown in the drawings in order from the left side. First, two circular portions indicated by diagonal lines in the center of the steel strip 10 are punched out as pilot holes 11 . Next, the steel strip 10 is sent to the right side, and openings 12 and 13 are formed by punching out the hatched portions on both sides of the steel strip 10 using the pilot hole 11 as a reference. Then, the steel strip 10 is further fed, a groove for forming the keyway portion of the board is formed by trimming the diagonal line portion 14, and then a through hole 15 is formed in each hole to be used for positioning when joining the laminated plates. Two locations are formed at the lower side of the figure with respect to the openings 12 and 13. Furthermore, pilot hole 11
The diagonally shaded portion 16 including 1 is punched out as a cutting portion for cutting the substrate 17 one by one.

FIG. 6 shows a process for forming a laminate plate to be laminated on both sides of the substrate 17 formed as described above. The laminated plate is formed by subjecting the steel strip 20, which is fed along the longitudinal direction like the substrate 17, to the illustrated processing in order from the left. First, the hatched circular parts at two locations in the center of the steel strip 20 are punched out as pilot holes 21, and then the hatched parts on both sides and the center of the steel strip 20 are punched out to form openings 22, 23, and 24. . Then, the diagonally lined portion between the openings 23 and 24 is punched out to form an inner groove 25a that forms the key thread 25. Further, as a pre-processing for forming the keyway 31, the part 26 where the thickness is the thinnest between the inner groove 25a and the inner groove 25a is first punched out, and then the groove 27 corresponding to the keyway part is punched out. Next, the protrusions 28 are formed by punching out two locations on the lower side of the figure relative to the openings 22 and 24 on both sides, and the pilot holes 21
The laminate board 30 is cut out one by one by punching out the diagonally shaded part 29 including the cut part. Note that the laminate 30 is the same as the substrate 1.
Since it is joined to both sides of 7, the same key mountain shape is 2
Formed one by one. In addition, the substrate 17 in the laminate 30
An adhesive layer containing solder is formed on the side surface as in the first embodiment.

Since the key threads 25 of the laminate board 30 are to be formed into various shapes, the same die is always used for punching them, such as the pilot hole 21 and the openings 22, 23, 24, etc. I can't afford it. Therefore, in this embodiment, the punching of the inner groove 25a is performed by a system as shown in FIGS. 7 and 8. FIG. 7 is a plan view showing the punching state, and FIG. 8 is a sectional view showing the structure of the punching die. This mold has punch 5 as shown in the figure.
0, a die 51, a stripper 52, and a holder 53. The die 51 and the stripper 52 are held in the holder 53, which has a groove 53a through which the steel strip 20 can be inserted and removed, and the punch 50 slides within the stripper 52. This is possible. 54 is a plate that transmits force from a press mechanism (not shown) to the punch 50, and 55 is a spacer that is inserted into the outer surface of the punch 51 only when not pressing, in order to keep the punch 50 away from the die 51 when not pressing. It is. A holder 53 is equipped with one type of punch 50, one die 51, and one type of stripper 52 each having a shape corresponding to a different key mountain shape. As shown in FIG. 7, this holder 53 is sequentially fed in the direction A, and at a predetermined position, sent out in the direction B toward the steel strip 20, punched out the key thread, and then pulled back in the direction C to return to the original position. , further send in the A direction. By repeating this movement, key peaks of various shapes can be continuously and efficiently formed.

The substrate 17 and the laminate 30 formed as described above are bonded so that the adhesive layer is in contact with the substrate 17, as shown in FIG. 9 and FIG. The protrusions 28 of the laminated plate 30 are fitted into the through holes 15 of the substrate 17 to position the laminated plate 30, and then the laminated plate 30 is bonded by heating. Thereafter, the unnecessary portion of the lower part of the keyway 31 is removed as shown in FIG. 11, and a knob is formed on the head part by resin molding in the same manner as in the first embodiment, thereby completing the manufacture of the key.

As explained above, according to the key manufacturing method according to this embodiment, the substrate 17 and the laminate 30 are each formed continuously, so manufacturing efficiency is improved and manufacturing time is shortened. can. In addition, since positioning is performed using the through hole 15 of the substrate 17 and the protrusion 28 of the laminate 30, it is possible to ensure that the position of the key 25 does not shift with respect to the substrate 17 during bonding, resulting in a defective product. It can be prevented. Further, the key thread 25 of the laminate 30 is formed by punching out by press working, but since it is bonded to the substrate 17 made of stainless steel, which is a relatively strong material, the key itself has sufficient strength. is obtained.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented in various other ways. For example, in each of the above embodiments, an adhesive layer containing solder is provided on one side of the laminates 2, 30 in order to heat bond the substrates 1, 17 and the laminates 2, 30, but instead , 17 may be provided with an adhesive layer on both sides, or may be joined by seam welding, spot welding, etc. without providing an adhesive layer. In addition, as a bonding method, the substrates 1, 17
Several through holes are formed in the same way as in each of the above embodiments,
With the laminated plates 2 and 30 stacked on the substrates 1 and 17, parts of the laminated plates 2 and 30 corresponding to the through holes are punched out and bonded to further improve the reliability of the bonded parts. Therefore, spot welding or the like may be performed at that location.

[Brief explanation of drawings]

FIG. 1(a) is a plan view of a mold used for forming a key peak of a conventional outside key, and FIG. 1(b) is a diagram showing its use.

FIG. 2 is a perspective view showing a key according to an embodiment of the present invention in a state before the laminate is bonded.

FIG. 3 is a perspective view showing a state in which a substrate and a laminate are joined.

FIG. 4 is a perspective view showing a state in which a knob is formed on the head.

FIG. 5 is a plan view showing the process of forming the substrate.

FIG. 6 is a plan view showing the process of forming a laminate.

FIG. 7 is a plan view showing the punched state of the key.

FIG. 8 is a sectional view showing a punching die for the key mountain.

FIG. 9 is a plan view showing a state in which the substrate and the laminate are stacked.

10 is an enlarged sectional view taken along the line XX in FIG. 9. FIG.

FIG. 11 is a plan view showing a state where unnecessary parts of the substrate and the laminate are trimmed.

[Explanation of symbols]

Claims (3)

[Claims] Claim 1: A substrate (1, 17) formed into a key shape.
), and an inner groove (4a, 25a) that is bonded to both sides of the substrate (1, 17) and constitutes a key thread (4, 25) is formed passing through the central part of the keyway (3, 31). An inner groove key characterized in that it is composed of a laminated plate (2, 30). 2. A method for manufacturing an inner groove key having an inner groove (4a, 25a) constituting a key mountain (4, 25) in the central part of a keyway (3, 31), comprising: a key-shaped substrate (
1, 17) and the substrate (1, 17).
a second step of forming a laminated plate (2, 30) having a shape corresponding to the shape of the laminated plate (2, 30) and forming the inner groove (4a, 25a) passing through the keyway (3, 31) of the laminated plate (2, 30); , a third step of laminating the laminated plates (2, 30) on both sides of the substrate (1, 17). 3. The first step includes a plurality of substrates (17).
The second step is a step of continuously forming a plurality of laminates (30), and a punch corresponding to a different key shape to be formed for each laminate (30). (50) and a die (51) are sent out to a predetermined position according to each laminate (30) and pressed, thereby continuously forming the inner groove (25a). and the third step is a step of continuously forming the key by bonding the substrate (17) and the laminate (30). Method of manufacturing groove keys.