JPH0561012B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a key manufacturing method and a key manufactured by the method, and particularly to a key for manufacturing a key formed by overlapping a plurality of thin plates in a predetermined order and integrally fixing them. The present invention relates to a manufacturing method and a key manufactured by the method.

[Conventional technology]

An example of a conventional key and a method for manufacturing the key will be described with reference to FIGS. 23 to 26. A conventional key consists of only one key-shaped flat plate 11 as shown in FIG. The key-shaped flat plate 11 is punched out of a plate material such as titanium or stainless steel. In general, the key-shaped flat plate 11 includes:
Joint window 11a for passing the ring part of the keychain
is provided. The 24th, 2nd
As can be seen from Fig. 5, the keyhole insertion portion 1 is
Cutting is performed on 1c. Further, by appropriately marking the head portion 11f of the flat plate 11, the flat plate 11 is finished into a desired key 10 as shown in FIG. 26. On the other hand, in addition to this method, similarly to this method, a single key-shaped flat plate 11 is punched out of a plate material, and then the flat plate 11 is pressed to form recesses 11d and 11e in the keyhole insertion portion 11c. death,
Furthermore, there is also a method of finishing the flat plate 11 into a desired key by attaching a mark 10a to the head 11f.

[Problem to be solved by the invention]

However, the former method for manufacturing the conventional key has the following problems. That is, since titanium and stainless steel have low thermal conductivity, the heat generated during cutting of the flat plate 11 is difficult to escape to the outside and tends to accumulate on the cut surface. For this reason, if the cutting speed is increased, the cut surface of the flat plate 11 will seize, so the cutting speed must be reduced, resulting in poor productivity. On the other hand, the latter method has the following problems. That is, great pressure is required to press the keyhole insertion portion 11c to form the recesses 11d and 11e. Furthermore, when the flat plate 11 is simply pressed, the flat plate 11 is compressed in a direction perpendicular to the direction in which the flat plate 11 is compressed.
1 can be extended uniformly, but the degree of extension cannot be adjusted in the compression direction, and it is impossible to form a slope in the compression direction. Therefore, the degree of freedom in the shape of the key itself is limited. becomes smaller. In addition, it is generally necessary to provide a joint window 11a for the key to pass through the ring part of the key holder, and if the width l of the joint window 11a is too small when designing the shape of the key, it will be necessary to Since the crosspiece 11b may bend, it cannot be made very small, and this also limits the degree of freedom in the shape of the key itself. The present invention has been devised in view of the above problems and to effectively solve them. Therefore, the purpose is to provide a key manufacturing method that has good productivity, does not require enormous pressure, and can manufacture keys with more free shapes, and a key manufactured by this method. It is about providing.

[Means to solve the problem]

A key manufacturing method according to the present invention and a key manufactured by the method are configured as follows in order to solve the problems of the prior art and to achieve the object thereof. That is, two methods are provided as the key manufacturing method according to the present invention, and the first method is to punch out a reference thin plate of a predetermined shape and a predetermined number of laminated thin plates of a predetermined shape from a material, and at the time of punching, a punching step of forming a notch in a part of the key insertion portion of a predetermined laminated thin plate among the predetermined number of laminated thin plates; and forming an engaging recess at a predetermined location on at least one surface of the reference thin plate; In the unevenness forming process, in which each laminated thin plate is stamped at a predetermined location to form an engaging protrusion on one surface and an engaging recess on the other surface, and between the thin plates that are stacked adjacent to each other, the above-mentioned Each of the engagement protrusions is irremovably engaged with each of the engagement recesses to fix both the thin plates together, and the notch of the key insertion portion of the predetermined laminated thin plate does not have the notch. The key insertion portion of the laminated thin plate and the fixing step of forming a step are sequentially performed. Further, the second method includes forming an engagement recess at a predetermined location on at least one surface of a reference thin plate punched portion for punching out a reference thin plate of the material, and at a predetermined location of a laminated thin plate punched portion for punching each laminated thin plate of the material. an unevenness forming step of forming the above-mentioned engagement protrusions on one side of each laminated thin plate punched portion of the material and forming the above-mentioned engagement recesses on the other surface, and the above-mentioned standards of the above-mentioned material. The thin plate punched portions are punched out to obtain the reference thin plate having a predetermined shape, and the punched portions of each of the laminated thin plates of the material are punched to obtain the laminated thin plates of a predetermined shape. A punching process in which a notch is formed in a part of the key insertion portion of a predetermined laminated thin plate, and each of the engaging protrusions is irremovably engaged with each of the engaging recesses between the thin plates stacked adjacent to each other. and fixing both thin plates together to form a step between the notch of the key insertion part of the predetermined laminated thin plate and the key insertion part of another laminated thin plate that does not have the notch. These should be done in order. In the first and second methods, the engagement recess of the reference thin plate may engage with the engagement protrusion of the laminated thin plate that is overlapped adjacent to the reference thin plate; It may be a bottom hole or a through hole. In the key according to the present invention, the predetermined number of laminated thin plates are stacked on the at least one surface of the reference thin plate in a predetermined order, and the reference thin plate and the predetermined number of laminated thin plates are adjacent to each other. Between the laminated thin plates, each of the above-mentioned engaging protrusions is irremovably engaged with each of the above-mentioned engaging recesses, so that both thin plates are integrally fixed, When a notch is formed in a part of the key insertion part and the laminated thin plates are overlapped and fixed, the key insertion part of the key insertion part of the predetermined laminated thin plate and the other laminated thin plate that does not have the cutout are formed. It is manufactured by either of the first and second methods described above, in which a step is formed by a portion.

[Actions and effects of the invention]

According to the first key manufacturing method according to the present invention, the reference thin plate and the predetermined number of laminated thin plates are respectively punched out of the material, the reference thin plate has the engagement recess, and each of the laminated thin plates has the engaging recess. The unevenness forming step of forming the engagement recesses and the engagement protrusions, and the step of irremovably engaging the engagement protrusions into the engagement recesses between two adjacent thin plates overlapped. By sequentially performing the fixing step of fixing the predetermined number of laminated thin plates to the reference thin plate, it is possible to easily manufacture one laminated key. is no longer necessary, and productivity can be improved. That is, for example, when forming a desired recess in the keyhole insertion portion of the key, if a step is created between adjacent thin plates, there is no need to perform cutting as in the conventional case. Further, according to the first key manufacturing method, as described above, for example, when forming a dent in the keyhole insertion portion of the key, the dent can be formed by a step created between mutually adjacent thin plates. can be easily formed. That is, compared to the conventional press working in which a large pressure is applied to the keyhole insertion portion of the key to form a recess, no large pressure is required at all. More specifically, for example, when providing a joint window for connecting to a key holder, if the width of the crosspiece is less than a predetermined value, the crosspiece itself will deform if it is formed using a large pressure as in the past. There were certain restrictions on dimensions. However, according to the above method, the joint window can be easily formed in the punching process, and in this case, even if the punching work is performed by press working, a small pressure is sufficient, so the width of the crosspiece is There are no restrictions on dimensions as mentioned above,
You can design more freely. Further, according to the first key manufacturing method, for example, when forming an inclined surface around the joint window of the key, a step-like inclined surface can be easily formed by creating a step between each adjacent thin plate. This allows greater freedom in the shape of the key at the time of design. In other words, in the conventional key manufacturing method, such an inclined surface cannot be formed by pressing, but can only be formed by cutting, and the productivity of trying to form the inclined surface by cutting is poor. Then a problem arose. According to the first key manufacturing method, a key having such an inclined surface can be manufactured efficiently and with a small pressure. In addition, in the first key manufacturing method, when fixing the thin plates, the engagement protrusions are engaged with the engagement recesses, thereby eliminating the need for adhesive or the like. It is possible to perform fixation work. Further, when forming the engaging convex portions and the engaging concave portions of each of the laminated thin plates, they are simultaneously formed by punching, so that productivity can be further improved. In the first key manufacturing method of the present invention, when the laminated thin plates are fixed by welding or the like, there is a possibility that unevenness may be inadvertently created in the welded part, or that the heat during welding may inadvertently cause thermal deformation. However, in the present invention, when stacking the laminated thin plates, the engaging concave portion is simply engaged with the engaging convex portion, so such work is not necessary. No flattening operations are required. Furthermore, when forming a step between a laminated thin plate with a notch and a laminated thin plate without a notch, accurate positioning is required between the laminated thin plates. By engaging them, the above positioning work can be performed easily and reliably. Furthermore, according to the second key manufacturing method, an unevenness forming step of forming the engagement recess in the reference thin plate punched portion, and the engagement recess and the engagement protrusion in the laminated thin plate punched portion of each material. and a punching step of punching out the reference thin plate and the laminated thin plate from each of the above materials, and a step of punching out each of the engaging convex portions into the respective engaging concave portions between the two adjacently stacked thin plates. By sequentially performing the fixing step of fixing the laminated thin plate to the reference thin plate by engaging with the reference thin plate, it is possible to easily manufacture one laminated key.
The same effects as the first key manufacturing method described above can be achieved. Further, both the keys manufactured by the first key manufacturing method and the keys manufactured by the second key manufacturing method have good productivity, do not require great pressure during manufacturing, and It can be manufactured into more flexible shapes. That is, in the key of the present invention, when fixing the thin plates, each of the engagement protrusions is engaged with each of the engagement recesses, thereby eliminating the need for an adhesive or the like, so that the thin plates can be easily fixed. be able to. In addition, when bonding laminated thin plates by welding, etc., there is a possibility that unevenness may be created inadvertently at the welded part, or that the heat during welding may cause inadvertent thermal deformation, so it is necessary to flatten it. However, in the present invention, when stacking the laminated thin plates, the engaging concave portion is simply engaged with the engaging convex portion, so such flattening work is not necessary. do not have.
In particular, when forming a step between a laminated thin plate with a notch and a laminated thin plate without a notch, accurate positioning is required between the laminated thin plates.
By thus engaging the engagement recess and the engagement protrusion, the above positioning work can be performed easily and reliably. Further, when a notch is formed in a part of the key insertion part of a predetermined laminated thin plate among the laminated thin plates, and the laminated thin plates are overlapped and fixed, the cutout of the key insertion part of the predetermined laminated thin plate is formed. Since a step is formed between the key insertion portion of another laminated thin plate that does not have the notch, a recess can be easily formed in the keyhole insertion portion of the key. That is,
Compared to conventional press working in which a large pressure is applied to the keyhole insertion portion of the key to form a dent, no large pressure is required at all.

【Example】

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a key manufacturing method and a key manufactured by the method according to the present invention will be described below with reference to FIGS. 1 to 22. First Embodiment A key manufacturing method according to a first embodiment of the present invention and a key manufactured by the method will be described below with reference to FIGS. 1 to 12. The key 1 manufactured by the key manufacturing method according to the first embodiment has a generally rectangular head 2c,
3c, 4c, 5c, 6c, and keyhole insertion portions 2d, 3d, 4d, 5d, 6d extending downward in the first, fourth and sixth figures of the head, which are inserted into the keyhole. key-shaped thin plates, that is, the first, third, and fourth thin plates 2, 3, 4, and 5 as the laminated thin plates.
and the fifth thin plate 6 as the reference thin plate are superimposed in this order and fixed integrally. In this embodiment, the key 1 is manufactured by sequentially performing the following four steps. (1) Punching process The above five thin plates 2, 3, 4, 5, and 6 are each punched out from a stainless steel plate as a raw material using a press. In the first embodiment, the third thin plate 4 has an axial center line 1 as shown in FIGS. 4 and 5.
It has a symmetrical shape with respect to 3. On the other hand, the first thin plate 2 and the second thin plate 3 have the same shape, and as shown in FIGS. 1, 2, and 3,
The shape is such that approximately the left half of the keyhole insertion portion 4d of the third thin plate 4 is cut out with respect to the center line 13 in the axial direction. On the other hand, the fourth thin plate 5 and the fifth thin plate 6 have the same shape, and as shown in FIGS. 6, 7, and 8, the fourth thin plate 5 and the fifth thin plate 6 have approximately It looks like the right half has been cut away. As can be seen from FIG. 2, the first thin plate 2 and the second thin plate 3 are both flat plates with a constant thickness, and the upper ends of each head 2c, 3c have approximately rectangular shapes penetrating in the thickness direction. It has openings 2e and 3e for forming joint holes. Further, the third thin plate 4, the fourth thin plate 5 and the fifth thin plate
At the locations of the thin plate 6 corresponding to the locations where the openings 2e and 3e of the first thin plate 2 and the second thin plate 3 are provided, there are openings 4e, 5e for forming joint holes having exactly the same shape as the openings 2e, 3e. 6e are provided respectively. Further, the third thin plate 4, the fourth
The thin plate 5 and the fifth thin plate 6 are flat plates having a constant thickness like the first thin plate 2 and the second thin plate 3, and therefore the third thin plate 4, the fourth thin plate 5 and the fifth thin plate 6 are
The longitudinal section of the above-mentioned first
It is approximately the same as the longitudinal cross section of the thin plate 2 and the second thin plate 3. (2) Concavo-convex forming process Punching is performed at a total of eight locations, including four corners of the head 6c of the fifth thin plate 6 and four locations spaced apart by a predetermined distance on the axial center line 14 of the fifth thin plate 6. As can be seen from FIGS. 6 and 8, circular through holes 6b, . . . , 6b are formed through the thickness direction. Each through hole 6b functions as each engagement recess 6a of the fifth thin plate 6. Meanwhile, the remaining 4
Regarding the thin plates 2, 3, 4, and 5, from the front 2f, 3f, 4f, and 5f sides of eight locations corresponding to the eight locations of the fifth thin plate 6, respectively, to the back 2g, 3
As can be seen from Figures 1, 3, 4, 5, 6, and 7, the front faces 2f, 3 of each of the eight locations are stamped on the g, 4g, and 5g sides.
On the f, 4f, and 5f sides, there are circular engagement recesses 2b,
..., 2b, 3b, ..., 3b, 4b, ..., 4b,
5b,..., 5b, the back side 2 of each of the eight locations
Engagement protrusions 2a on the g, 3g, 4g, and 5g sides,
..., 2a, 3a, ...3a, 4a, ..., 4a, 5
a,..., 5a are formed. In the first embodiment, the inner diameter of the through hole 6b of the fifth thin plate 6, the inner diameter of each of the engaging recesses of the first to fourth thin plates 2, 3, 4, and 5, and the engaging protrusions The outer diameters of all the outer diameters are approximately equal. (3) Fixing step Each engaging convex portion 5a of the fourth thin plate 5 is press-fitted into each through hole 6a of the fifth thin plate 6 from the front 6f side of the thin plate 6, so that each engaging convex portion 5a is It is caulked so that it cannot come out from each through hole 6a. Further, each of the engagement protrusions 4a of the third thin plate 4 is press-fitted into each of the engagement recesses 5b of the fourth thin plate 5, so that each of the engagement protrusions 4a cannot come out from each of the engagement recesses 5b. Caulk it like this. Similarly, the second thin plate 3 is inserted into each engagement recess 4b of the third thin plate 4.
Further, each of the engagement projections 2a of the first thin plate 2 is press-fitted into each of the engagement recesses 3b of the second thin plate 3, and each of the engagement projections 3a is press-fitted into each of the engagement recesses 3b of the second thin plate 3. In addition, the respective engaging convex portions 2a are arranged so that they cannot be pulled out of the engaging concave portions 4b.
Tighten it so that it is impossible to escape from b. As a result, the first to fifth thin plates 2, 3, 4,
5, 6 heads 2c, 3c, 4c, 5c, 6c
are overlapped to form the head 1a of the key 1, and the five thin plates 2, 3, 4, 5, 6
Each keyhole insertion part 2d, 3d, 4d, 5d, 6d
are overlapped to form the keyhole insertion part 1b of the key 1, and the five thin plates 2, 3, 4, 5, and 6 are integrated in a layered manner, so that the key 1 according to this embodiment is substantially different from the conventional one. As in the case, it is formed as a single flat plate. As can be seen from FIGS. 9 and 12, the openings 2e, 3e, 4e, 5e, and 6e of the five thin plates 2, 3, 4, 5, and 6 coincide with each other to form the joint window of the key 1. 1c is formed. (4) Marking process If necessary, mark 1f as shown in FIG. Finish it as a product. According to the key manufacturing method according to the first embodiment,
The above five thin plates 2 from the above stainless steel plate,
3, 4, 5, and 6 respectively, and the engaging recesses 2b, 3b, 4b, 5b, each of the rear surfaces 2g, 3g, 4g, and 5g has the above-mentioned engagement protrusion 2
a, 3a, 4a, and 5a, while forming an unevenness forming step in which the through holes 6b are formed in the fifth thin plate 6 of the ruler, and each through hole 6b of the fifth thin plate 6 is formed in each engagement of the fourth thin plate 5. While press-fitting the mating convex portions 5a, for the first to fourth thin plates 2, 3, 4, and 5, the respective engaging convex portions of one of the two thin plates stacked adjacent to each other are pressed into the other. A fixing process in which the other four thin plates 2, 3, 4, and 5 are press-fitted into the engagement recesses of the thin plate 6, and a marking process in which a mark 1f is attached to the front face 1d of the head 1a. By sequentially performing the above steps, it is possible to easily manufacture one stacked key 1, thereby eliminating the need for a cutting process as in the conventional case, and improving productivity. In addition, in the key manufacturing method according to the first embodiment, the width of the keyhole insertion portions 2d and 3d of the first and second thin plates 2 and 3 is determined by the fixing step. The keyhole insertion portion 2 of the first and second thin plates 2 and 3 is narrower than the width of the portion 4d.
In order to fix the first and second thin plates 2, 3 to the third thin plate 4 by aligning the right side edges of d and 3d in FIG. 1 with the right side edges of the third thin plate 4 in FIG. As can be seen from FIGS. 9 and 11, there is a step 1 on the front surface 1d of the keyhole insertion portion 1b of the key 1.
5 occurs. On the other hand, the fourth and fifth thin plates 5,
The width of the keyhole insertion portions 5d and 6d of the fourth and fifth thin plates 5 and 6 is narrower than the width of the keyhole insertion portion 4d of the third thin plate 4.
The left edge of the third thin plate 4 in FIG. 4 is aligned with the left edge of the third thin plate 4 in FIG.
In order to fix it to the thin plate 4, the ninth and first
As can be seen from FIG. 1, a step 16 is formed on the back surface 1e of the keyhole insertion portion 1b of the key 1. Therefore, in press working as in the past, the key 1
Compared to the method in which a step is formed by applying a large pressure to the keyhole insertion part 1b, no large pressure is required at all. By the way, the above five thin plates 2, 3, 4, 5,
6 and a conventional single key, the five thin plates 2, 3, 4, 5, and 6 can be considered to be the conventional single key divided into five parts in the thickness direction. , the five thin plates 2, 3, 4,
The thicknesses of keys 5 and 6 are thinner than the thickness of one conventional key. Therefore, in the punching process, the five thin plates 2, 3, 4,
Openings 2e and 3 for forming joint windows in 5 and 6, respectively.
e, 4e, 5e, 6e, it is sufficient to apply less pressure than when forming a seam in a conventional key, so that each thin plate 2, 3, 4, 5, 6 respective openings 2e, 3
There is no restriction that the crosspiece width dimensions of e, 4e, 5e, and 6e must be greater than a predetermined value. Therefore, as shown in FIGS. 9 and 12, the crosspiece width dimension L of the joint window 1c of the key 1 formed by matching each of the openings 2e, 3e, 4e, 5e, and 6e is limited. Therefore, the crosspiece width dimension L can be designed more freely than in the conventional case. Further, in the key manufacturing method according to the first embodiment, when fixing the fourth thin plate 5 and the fifth thin plate 6, each of the engaging convex portions 5a of the fourth thin plate 5 is Each of the through holes 6 of the fifth thin plate 6
By press-fitting into b, the above-mentioned first to
When fixing the fourth thin plates 2, 3, 4, and 5, each of the engaging convex portions of one of the two thin plates stacked adjacent to each other is connected to the engaging convex portion of the other thin plate. By engaging with each of the above-mentioned engagement recesses, adhesive or the like is not required, so that the fixing work can be easily performed. Further, when forming the respective engaging convex portions and the respective engaging concave portions of the first to fourth thin plates 2, 3, 4, and 5, these are simultaneously formed by punching, Since the engagement recess 6a is formed by punching the fifth thin plate 6, productivity can be further improved. As can be seen from the above description, the key 1 according to the first embodiment has good productivity, does not require great pressure during manufacturing, and can be manufactured into a more flexible shape than conventional keys. It is something. In the key manufacturing method according to the first embodiment, the unevenness forming step is performed after the punching step, but the order of these two steps may be reversed. That is, the first to fourth thin plates 2, 3, 4, and 5 of the stainless steel plate are punched out at predetermined locations in the punched portions thereof to form the engagement protrusions and the engagement recesses, and , After punching a predetermined portion of the stainless steel plate where the fifth thin plate 6 is punched out to form the through hole, punch out the five thin plates 2, 3, 4, 5, and 6 from the stainless steel plate. You can do it like this. Second Embodiment Hereinafter, the key manufacturing method according to the second embodiment of the present invention and the key manufactured by the method will be described.
This will be explained with reference to FIGS. 3 to 22. As shown in FIG. 22, the key manufacturing method according to the second embodiment uses two keys 7 having the same external shape as the key 1 manufactured by the key manufacturing method according to the first embodiment. It is manufactured by overlapping and integrally fixing key-shaped thin plates, that is, the first thin plate 8 as the laminated thin plate and the second thin plate 9 as the reference thin plate. As shown in FIGS. 13 and 16, the thin plates 8 and 9 have approximately rectangular heads 8c and 9c, and 13th and 1st parts of the heads 8c and 9c, which are inserted into the keyhole.
It consists of keyhole insertion parts 8d and 9d extending downward in FIG. The keyhole insertion portion 8d of the first thin plate 8 is
The thin plate 8 is divided into a long and symmetrical first part 8f along the center line 17 in the axial direction, and a second part 8g located on the right side of the first part 8f in FIG. It will be done. On the other hand, the keyhole insertion portion 9d of the second thin plate 9 includes a first portion 9f that is symmetrical with respect to the axial center line 18 of the second thin plate 9 and extends along the center line 18; 9f and a second portion 9g located on the left side in FIG. (1) Punching process The above two thin plates 8 and 9 are each punched out from a titanium steel plate using a press. In the second embodiment, the first thin plate 8
As shown in FIG. 13, has the same outer shape as the first and second thin plates 2 and 3 in the first embodiment. On the other hand, the second thin plate 9
As shown in the figure, the fourth
and has the same outer shape as that of the fifth thin plates 5 and 6. Further, the two thin plates 8 and 9 used in the second embodiment have a thickness at the upper end of each head 8c and 9c, similar to the five thin plates used in the first embodiment. Openings 8e and 9e for forming approximately rectangular joint holes passing through in the horizontal direction
have. (2) Bending process Connect the keyhole insertion portion 8d of the first thin plate 8 to the head 8c.
The front side 8h of the head 8c and the front side 8h of the keyhole insertion part 8d are parallel to each other, and the back side 8i of the head 8c and the back side 8i of the keyhole insertion part 8d are bent toward the front side 8h. A slight constriction is created at the boundary between the head 8c and the keyhole insertion portion 8d so that the two are parallel to each other. As a result, a slight step is created between the front surface 8h of the head 8c of the first thin plate 8 and the front surface 8h of the keyhole insertion portion 8d, and a difference in level is created between the front surface 8h of the head 8c of the first thin plate 8 and the front surface 8h of the keyhole insertion portion 8d. A slight step 8j as shown in FIG. 14 also occurs between the back surface 8i and the rear surface 8i. On the other hand, by bending the keyhole insertion portion 9d of the second thin plate 9 toward the back surface 9i with respect to the head 9c, the head 9
The first thin plate 8 is placed between the keyhole insertion portion 9d and the keyhole insertion portion 9d.
It causes a constriction similar to that of . As a result, a step 9j as shown in FIG. 17 is created between the front surface 9h of the second thin plate 9 with respect to the head 9c and the front surface 9h of the keyhole insertion portion 9d, and the back surface 9i of the head 9c is A step is also formed between the keyhole inserting portion 9d and the back surface 9i of the keyhole insertion portion 9d. (3) Crushing process A crushing process is performed on the front 8h side of the first portion 8f of the keyhole insertion portion 8d of the first thin plate 8, and the 14th
As can be seen from FIG. 15, the first portion 8
The step difference between the front 8h of the head 8h and the front 8h of the head 8c is eliminated. As a result, the second portion 8g remains on the front surface 8h of the first thin plate 8 in a state where it is more raised than the other portions. On the other hand, the back surface 9i of the first portion 9f of the keyhole insertion portion 9d of the second thin plate 9
As can be seen from FIGS. 17 and 18, the back surface 9i of the first portion 9f is
The step difference between the head 9c and the back surface 9i of the head 9c is eliminated. As a result, the second portion 9g remains on the back surface 9i of the second thin plate 9 in a state where it is more raised than the other portions. (4) Concavo-convex forming step At seven locations in total, including the four corners of the head 8c of the first thin plate 8 and three locations spaced apart by a predetermined distance on the center line 17 of the keyhole insertion portion 8d, from the back surface 8i side to the front surface 8h. Embossed on the side,
As can be seen from FIGS. 13 and 15, on the front side 8h of the seven locations, circular engagement protrusions 8a,...,
8a, circular engagement recesses 8b, . . . , 8b are formed at the seven locations on the rear surface 8i side. On the other hand, the second
7 of the thin plate 9 corresponding to the seven locations of the first thin plate 8
By stamping the parts, the 16th and 1st
As can be seen from Fig. 8, circular through holes 9b, . . . , 9b are formed through the thickness direction. Each through hole 9b functions as each engagement recess 9a of the second thin plate 9. The inner diameter of each through hole 9b is the 18th
As can be seen from the figure, the back surface 9 of the second thin plate 9
The dimension from i to approximately 1/3 of the thickness of the second thin plate 9 is approximately the same as the outer diameter of each engaging convex portion 8a of the first thin plate 8, and the remaining dimension is approximately 2/3. The width is made to gradually increase from the back side 8i to the front side 8h. (5) Fixing step Each engaging convex portion 8a of the first thin plate 8 is press-fitted into each through hole 9b of the second thin plate 9 from the back surface 9i side of the thin plate 9, so that each engaging convex portion 8a is It is caulked so that it cannot come out from each through hole 9b. As a result, as shown in FIGS. 19 and 22, each head 8 of the first and second thin plates 8, 9
The head part 7a of the key 7 is formed by overlapping the parts c and 9c, while the keyhole insertion part 7b of the key 7 is formed by the overlap of the keyhole insertion parts 8d and 9d of the first and second thin plates 8 and 9. is formed, and the two thin plates 8 and 9 are integrated in a layered manner, so that the key 7 according to the second embodiment can function as a single flat plate substantially similar to the conventional case. As can be seen from FIGS. 19 and 22, the openings 8e and 9e of the first and second thin plates 8 and 9 are aligned with each other, and the key 7
A seam window 7c is formed. Further, since the inner surface of each through hole 9b of the second thin plate 9 is tapered approximately 2/3 of the dimension from the front face 9h side of the second thin plate 9,
When the first thin plate 8 is caulked against the second thin plate 9, as can be seen from FIG. The outer diameter of the tip portion is larger than the inner diameter of the opening of each through hole 9b on the side into which each engaging convex portion 8a is press-fitted. Therefore, each engagement convex portion 8a
Even if a force is applied to pull out the engaging protrusions 8a from the through holes 8b, the engaging protrusions 8a will not come out of the through holes 8b. (6) Marking process If necessary, a mark 7d as shown in FIG. 22 is attached to the front face 7e of the key 7, that is, the front face 9h of the head 9c of the second thin plate 9, to finish the key 7 as a product. According to the key manufacturing method according to the first embodiment,
the first and second thin plates 8, made of the titanium steel plate;
A punching process of punching out each of the 9 pieces, and the above-mentioned first
a bending step of bending the keyhole insertion portion 8d of the thin plate 8 toward the front side 8h with respect to the head 8c, and bending the keyhole insertion portion 9d of the second thin plate 9 toward the rear side 9i with respect to the head 9c; The first portion 8f of the keyhole insertion portion 8d of the thin plate 8 is crushed to eliminate the level difference between the front surface 8h of the first portion 8f and the front surface 8h of the head portion 8c of the first thin plate 8. A crushing step in which the first portion 9f of the keyhole insertion portion 9d of the second thin plate 9 is crushed to eliminate the level difference between the back surface 9i of the first portion 9f and the back surface 9i of the head 9c of the second thin plate 9; , forming an unevenness forming step in which the engagement protrusion 8a is formed on the front surface 8h of the first thin plate 8, the engagement recess 8b is formed on the back surface 8i, and the through hole 9b is formed on the second thin plate 9; , a fixing step of fixing the first thin plate 8 to the second thin plate 9 by press-fitting each engagement convex portion 8a of the first thin plate 8 into each through hole 9b of the second thin plate 9;
By sequentially performing the marking process of attaching the mark 1f on the d side, it is possible to easily manufacture one stacked key 7, eliminating the need for the conventional cutting process and increasing productivity. can be improved. Further, in the key manufacturing method according to the second embodiment, the first thin plate 8
The second portion 8g of the keyhole insertion portion 8d of the second thin plate 9 can be raised slightly more than the other portions on the front side 8h, and the second portion 9g of the keyhole insertion portion 9d of the second thin plate 9 can be placed on the back side 9i. It can be raised slightly more than the part above. For this reason, the second thin plate 8 of the keyhole insertion portion 8d
The left edge of the portion 8g in FIG. 13 is aligned with the right edge of the first portion 9f of the keyhole insertion portion 9d of the second thin plate 9 in FIG. The right edge of the second portion 9g in FIG. 16 is connected to the first portion 8f of the keyhole insertion portion 8d of the first thin plate 8.
By matching the left side edge in Figure 13 of
The second thin plate 9 can be easily positioned with respect to the first thin plate 8 so that the axial center lines 17 and 18 of the first and second thin plates 8 and 9 coincide with each other. The second thin plate 9 is connected to the first thin plate 9.
By positioning the thin plates 8 in this manner and fixing both the thin plates 8 and 9 to each other in the fixing step, the first portions 8f of the keyhole insertion portions 8d and 9d of the first and second thin plates 8 and 9 are fixed. ，
9f overlap each other, while the second portion 8g of the keyhole insertion portion 8d of the first thin plate 8 overlaps the second thin plate 9.
The second part 9g of the keyhole insertion part 9d of the second thin plate 9 does not overlap with any part of the throat, and the second part 9g of the keyhole insertion part 9d of the second thin plate 9
It does not overlap with any part of the thin plate 8. Therefore, as can be seen from FIGS. 19 and 21, a step 20 is formed on the front surface 7e of the keyhole insertion portion 7b of the key 7, while a step 20 is formed on the back surface 7e of the keyhole insertion portion 7b.
A step 21 occurs at f. Therefore, the keyhole insertion portion 7 of the key 7 is
Compared to the method in which a step is formed by applying a large pressure to b, a large pressure is not required at all. By the way, when comparing each of the first thin plate 8 and the second thin plate 9 with a conventional single key, the first thin plate 8 and the second thin plate 9 have the same thickness as the conventional single key. It can be considered that the first thin plate 8 and the second thin plate 9 are divided into two parts.
The thickness of each is thinner than the thickness of a single conventional key. Therefore, when forming the openings 8e and 9e for forming a joint window in the first and second thin plates 8 and 9, respectively, by press working in the punching process, the joint window is formed in the single conventional key. Since it is sufficient to apply a smaller pressure than to form the thin plates 8 and 9, there is no restriction that the crosspiece width dimensions of the openings 8e and 9e of the respective thin plates 8 and 9 must be greater than a predetermined value. Therefore, the crosspiece width dimension L' of the joint window 7c of the key 7 formed by matching each of the openings 8e and 9e is not limited, and the crosspiece width dimension is smaller than that in the conventional case. L′ can be designed more freely. Further, in the key manufacturing method according to the second embodiment, when fixing the first thin plate 8 and the second thin plate 9, each of the engaging convex portions 8a of the first thin plate 8 is Each of the through holes 9b of the second thin plate 9
By press-fitting, adhesive or the like is not required, so the fixing work can be easily performed.
Further, when forming each of the engagement protrusions 8a and each of the engagement recesses 8b of the first thin plate 8, these are simultaneously formed by stamping, while the second thin plate 8
Since the engaging recess 9a is formed by punching, productivity can be further improved. As can be seen from the above description, the key 7 according to the second embodiment has good productivity, does not require great pressure during manufacturing, and can be manufactured into a more flexible shape than conventional keys. It is something. In addition, the bending process also allows the first and second
Since the thin plates 8 and 9 have constrictions formed at the boundaries between the respective heads 8c and 9c and the keyhole insertion portions 8d and 9d, the first and second thin plates 8 and 9 are formed in the above fixing process. are fixed to each other, the 20th
As can be seen from the figure, the keyhole insertion part 7 of the key 7
b is thinner than the head 7a, which allows the key 7 itself to have an attractive design. The present invention is not limited to the above-described embodiments, but can be implemented in various other ways. For example, in the two embodiments described above, the openings of the respective thin plates are perfectly aligned to form the joint windows 1c and 7c of the keys 1 and 7, but the edges of the corresponding openings of the thin plates are When each of the laminated thin plates is positioned relative to the reference thin plate so that the parts of the laminated thin plates are shifted little by little, the edge of the reference thin plate becomes continuous, and the edge of each laminated thin plate becomes continuous in the thickness direction. A stepped slope is formed. Such a stepped slope cannot be formed using conventional key manufacturing methods. Furthermore, in the above-described embodiment, the materials of each of the thin plates are the same, but the materials of each of the thin plates may be different. However, it is preferable to use a material that does not require plating for each of the thin plates. In this case, the colors of each of the thin plates may also be made different. For example, a golden colored thin plate and a silver colored thin plate are used, and the golden colored thin plate and the silver colored thin plate are overlapped alternately, and the joint window 1
By forming the stepped slopes on the inner surfaces of c and 7c, the color appearing on the stepped slopes can have fashionability.

[Brief explanation of drawings]

FIG. 1 is a front view of the first and second thin plates after the unevenness forming step in the first embodiment of the key manufacturing method according to the present invention, FIG. 2 is a sectional view taken along the line H-H in FIG. 1, and FIG. 1 is an enlarged sectional view of the main part taken along the line A-A in FIG. 1, FIG. 4 is a front view of the third thin plate after the unevenness forming process of the first embodiment, and FIG. Enlarged sectional view,
FIG. 6 shows the fourth embodiment after the unevenness forming process in the first embodiment.
and a front view of the fifth thin plate, FIG. 7 is C-C in FIG.
An enlarged sectional view of the main part of the fourth thin plate along the line, No. 8
The figure also shows the above-mentioned 5th line taken along line C-C in Figure 6.
A sectional view of the main parts of the thin plates, FIG. 9 shows the first and second thin plates shown in FIG. 1, the third thin plate shown in FIG. 4,
FIG. 6 is a front view of the key obtained by fixing the fourth and fifth thin plates to each other, FIG. 10 is an enlarged left side view of the key shown in FIG. 9, and FIG. 11 is the key shown in FIG. 9. FIG. 12 is a front view of the key shown in FIG. 9 after marking has been applied to the key, and FIG. 13 is a second implementation of the key manufacturing method according to the present invention. A front view of the first thin plate after the unevenness forming step of the example,
14 is a sectional view taken along the line I-I in FIG. 13, FIG. 15 is an enlarged sectional view taken along the line E-E in FIG. 13, and FIG.
The figure is a front view of the second thin plate after the unevenness forming process of the second embodiment, FIG. 17 is a cross-sectional view taken along line J-J in FIG. 16, and FIG. 18 is an enlarged view of the main part taken along line F-F in FIG. The cross-sectional view, Fig. 19, shows the first thin plate and the first thin plate shown in Fig. 13.
A front view of the key obtained by fixing the second thin plate shown in FIG. 6, FIG. 20 is a sectional view taken along the line K-K in FIG. 19, and FIG. An enlarged sectional view, FIG. 22 is a front view of the key shown in FIG. 19 after marking has been applied, FIG. 23 is a front view of the thin plate after the punching process of the conventional key manufacturing method by cutting, Figure 24 is a front view of the key obtained by cutting the thin plate shown in Figure 23;
5 is a sectional view taken along the line MM in FIG. 24, and FIG. 26 is a front view of the key after the markings shown in FIG. 24 have been applied. 1... Key, 2... Laminated thin plate (first thin plate), 3
...Laminated thin plate (second thin plate), 4... Laminated thin plate (third thin plate), 5... Laminated thin plate (fourth thin plate), 6... Reference thin plate (fifth thin plate), 2a, 3a, 4a, 5a …
...Engagement convex portions of laminated thin plates, 2b, 3b, 4b, 5b
... Engagement recess of laminated thin plate, 6a... Engagement recess of reference thin plate, 7... Key, 8... Laminated thin plate (first thin plate), 9... Reference thin plate (second thin plate), 8a... Lamination Engagement convex portion of thin plate, 8b... Engagement recess of laminated layer, 9a
...Engagement recess of reference thin plate.

Claims (1)

[Scope of Claims] 1. A standard thin plate 6; 9 of a predetermined shape and a predetermined number of laminated thin plates 2, 3, 4, 5; A punching step of forming a notch in a part of the key insertion portion of a predetermined laminated thin plate, and forming an engaging recess 6a; 9a at a predetermined location on at least one surface of the reference thin plate 6; The laminated thin plates 2, 3, 4, 5; 8 are punched out at predetermined locations to form engagement protrusions 2 on one side.
a, 3a, 4a, 5a; 8a and forming engagement recesses 2b, 3b, 4b, 5b; 8b on the other surface; The mating convex portions are irremovably engaged with the respective mating concave portions to secure the two thin plates together,
A key manufacturing method characterized in that a fixing step of forming steps 15 and 16 by the notch of the key insertion portion of the predetermined laminated thin plate and the key insertion portion of another laminated thin plate that does not have the notch is performed in sequence. . 2. An engagement recess 6a; 9a is formed at a predetermined location on at least one surface of the reference thin plate punched portion of the reference thin plate 6; 9 of the material, and each laminated thin plate 2, 3, 4, 5; 8 of the material is A stamping process is performed on a predetermined portion of the punched portion of the thin laminated sheet to be punched to form the above-mentioned engaging convex portions 2a, 3a, 4a, 5a; Each engagement recess 2b, 3b, 4
b, 5b; 8b; punching out the reference thin plate punched portion of the material to obtain the reference thin plate 6; 9 of a predetermined shape; Each of the above-mentioned laminated thin plates 2, 3, 4,
5; 8, and a punching step of forming a notch in a part of the key insertion part of a predetermined number of laminated thin plates among the predetermined number of laminated thin plates during punching; and between the thin plates stacked adjacent to each other, Each of the engaging convex portions is irremovably engaged with each of the above-mentioned engaging concave portions to integrally fix both thin plates,
A key manufacturing method characterized in that a fixing step of forming steps 15 and 16 by the notch of the upper key insertion portion of the predetermined laminated thin plate and the key insertion portion of another laminated thin plate that does not have the cutout is performed in sequence. . 3 the predetermined number of laminated thin plates 2, 3, 4, 5 on at least one surface of the reference thin plate 6; 9;
8 are superimposed in a predetermined order to form the reference thin plates 6; 9.
and the predetermined number of laminated thin plates 2, 3, 4, 5; 8
However, between the thin plates stacked adjacent to each other, each of the above-mentioned engaging protrusions is irremovably engaged with each of the above-mentioned engaging recesses, so that both thin plates are integrally fixed, and the above-mentioned laminated thin plates are fixed together. When a notch is formed in a part of the key insertion portion of a predetermined laminated thin plate and the laminated thin plates are overlapped and fixed, the key insertion portion of the predetermined laminated thin plate does not have the cutout and the key insertion portion of the predetermined laminated thin plate is formed. There is a step 15 due to the key insertion part of the laminated thin plate.
3. A key manufactured by the key manufacturing method according to claim 1 or 2, wherein the key is formed by the key manufacturing method according to claim 1 or 2.