JP2003039125A - Caulking mounting method of cutting blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently manufacture at a single process a member for forming a caulking pawl as a cutting blade made of a metallic thin plate and to efficiently fix the cutting blade having the caulking pawl to a paper made carton. SOLUTION: In the caulking mounting method by which the cutting blade is mounted on the material p to be processed such as the carton or the like, the die is composed of a pin A for forming the caulking pawl having a sharp tip end and an aperture C for forming a round caulking pawl against the member s for forming the caulking pawl as the cutting blade made of the metallic thin plate and, simultaneously when the aperture is opened on the member s for forming the caulking pawl by the pin A for forming the caulking pawl, the burring process is performed and a curling section K2 to slightly curl the tip end outside is shaped and a perpendicular startup section K1 is formed in series to bend and shape the caulking pawl K. Then, a press hammers the member s for forming the caulking pawl that has formed the caulking pawl K against the material p to be processed and the cutting blade that becomes the member s for forming the caulking pawl is fixed to the material P to be processed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of efficiently producing a caulking nail forming member as a cutting blade made of a thin metal plate in one step, and by extension, cutting blades with caulking nails in a paper carton. The present invention relates to a caulking attachment method for a cutting blade that can be efficiently attached.

[0002]

2. Description of the Related Art Conventionally, a caulking claw attachment method has been used to attach a cutting blade made of a thin metal plate to a paper carton for containing a wrap film or the like. This is adopted from the standpoints of installation cost and ease of manufacturing, since no glue or fasteners are used. However, the conventional caulking claw attachment method has a drawback that the manufacturing efficiency is poor.

Japanese Patent No. 3170371 exists as a conventionally known technique using the crimped nail. In this specification, page 3, column 6, lines 37 to 46, "A convenient method for making a crimped nail is to use a die for forming a crimped nail having a special shape. That is, a specific example of the die shape. as,
The tip of the mold that makes a cut for crimping nails on a thin plate is
The mold guiding portion, which has an obtuse angle of about 50 degrees (the tilt opening angle is about 100 degrees) with respect to the center line of the mold and pushes out the above-mentioned continuous cuts to erect the crimping claw, is This is to use a die having a so-called two-stage inclined portion, which has an acute angle of inclination of, for example, about 20 degrees (the inclination opening angle is about 40 degrees). It is described as ".

That is, the following contents are described in the specification of Japanese Patent No. 3170371. In the drawing assumed from that specification (see FIG. 14), in the first stage,
As shown in FIG. 14 (A), a caulking claw forming pressing pin a having an inclined opening angle of about 100 degrees is formed with a concave receiving mold so as to make a cut and curl, and then, In two steps, as shown in FIG. 14 (B), a caulking claw forming press pin a having an inclined opening angle of about 40 degrees is used for the lower mold so that the lower mold receives the burring piece at the angle of 40 degrees. It is a receiving mold and is pressed by a caulking nail forming pressing pin a of about 40 degrees to thereby form a caulking nail, which requires two steps.

[0005]

With such a two-step process, the manufacturing efficiency for forming the crimped nail becomes poor, and thus the member for forming the crimped nail after molding the crimped nail is formed in the carton. There was an inconvenience that the caulking attachment with a press was inefficient. Therefore, it has been desired to form the crimped nail in one step.

[0006]

Therefore, as a result of the inventors' earnest studies and researches to solve the above problems, the present invention has found that a caulking method for attaching a cutting blade to a workpiece such as a carton by caulking is used. In the above-mentioned, for a caulking claw forming member as a cutting blade made of a thin metal plate, a metal mold having a crimping claw forming pin having a sharp tip and a circular caulking claw forming hole is provided, and the caulking claw forming pin is provided. At the same time as making a hole in the caulking nail forming member with burring, a curl portion that slightly curls the tip to the outside is formed, and a vertical rising portion is continuously formed to bend the caulking nail. ,
After that, a caulking claw attaching method of a cutting blade for attaching a cutting blade serving as a caulking claw forming member to the workpiece by hitting a caulking claw forming member obtained by molding the caulking claw with respect to a workpiece as a carton with a press As a result, the crimped nail can be formed in one step, the productivity can be remarkably improved, and the above-mentioned problem is solved.

Further, in the present invention, the caulking of the cutting blade is formed by forming a column portion having a substantially square or circular cross section with respect to the caulking nail forming pin, and forming a quadrangular pyramid tip portion at the tip of the column portion. By using the mounting method, it is possible to form a stronger crimping nail, and in the present invention, a square columnar portion having a substantially rectangular cross section is formed with respect to the crimping nail forming pin, and the rectangular shape By adopting the caulking attachment method of the cutting blade in which the long side is the front and the V-shaped tip is formed at the tip of the rectangular column, a simple caulking nail can be formed and caulking can be easily performed. Further, the inclined opening angle of the pointed portion of the crimping nail forming pin is about 50.
By setting the angle to about 90 degrees, the curl portion can be made better, and the problems described above can be solved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A manufacturing method of a first embodiment of the present invention will be described below with reference to the drawings (see FIGS. 1 to 8), which is a type of burring claws formed as four claws. Reference numeral 1 denotes a four-claw pin of the caulking claw forming pin A, which is provided in the first mold B, and C is a caulking claw forming hole corresponding to the four-claw forming pin 1. 2 It is provided in the die D. In the drawing, the first mold B is upward,
Although the second mold D is located on the lower side, it may be installed in reverse. Further, the caulking claw forming pins A provided on the first mold B are configured to operate independently of each other, and the first mold B descends to move the second mold D. After being pressed, the crimping nail forming pin A is configured to descend after a short delay time.

As shown in FIGS. 6 and 7, the four-claw pin 1 has a quadrangular cross section (including a square) on the tip side of a cylindrical base 1a (including a circular cross section and a true cross section) (see FIG. 6
(Refer to FIG. 7) or circular section (including perfect circle) (see FIG. 7)
A pointed portion is formed at the tip of b as a pyramidal tip portion 1c. The caulking nail forming hole C has a cylindrical shape (including a perfect circle) and is a portion corresponding to the column portion 1b. That is, as shown in FIG. 2, when the post portion 1b of the four-claw pin 1 is completely inserted into the caulking claw forming hole C,
The crimping nail formation is completed. In FIGS. 6 (A) and 6 (B), the column portion 1b and the quadrangular pyramidal tip portion 1c have a shape in which the cylindrical portion and the conical portion are ground into square and quadrangular pyramids, and an arc surface or a conical surface is slightly left. It is what In FIGS. 7A and 7B, in the column portion 1b and the quadrangular pyramidal tip portion 1c, only the column portion has a quadrangular pyramid.

S is a member for forming a crimped nail, which is made of metal (for example, zinc iron plate or steel) and is a thin plate (for example,
The cutting blade is made of about 0.1 mm to 0.8 mm). Further, p is a workpiece such as one side of a paper carton that stores a wrap or the like in which the crimping nail K is fixedly crimped.

Next, the forming of the caulking claw K will be described. As shown in FIGS. 1 and 2, first, the caulking claw forming member s is placed between the first mold B and the second mold D. The pin 1 for the four-claw of the caulking claw forming pin A descends in a state of being clamped at a predetermined pressure by the above, and comes into close contact with the caulking claw forming member s on the second die D [ See FIG. 1A]. Further, when the four-claw pin 1 is lowered, the four-claw pin is moved from the upper side to the approximate center of the caulking claw forming member s whose both ends are fixed by the first mold B and the second mold D. 1 is pressed by the tip of the quadrangular pyramid-shaped tip 1c to deform the caulking claw forming member s into a V shape [see FIG. 1 (B)]. When the four-claw pin 1 is further lowered, a cut is made at the tip of the quadrangular pyramidal tip 1c beyond the limit of the malleability of the metal member of the caulking claw forming member s, and the curl is slightly curled outward. The curled portion K ₂ is formed [see FIGS. 1 (C) and 1 (D)].

[0012] Further, the four pawl pin 1 is slightly lowered, formed a caulking pawl K by four burring with rising portion K ₁ which in the quadrangular pyramid-shaped tip portion 1c contiguous to the curled portion K ₂ [See FIGS. 1 (E) and 1 (F)]. Actually, the rising portion K ₁ is further lowered by the pin 1 for the four claws, and this time, the column part 1b is pushed out to form the four caulking claws K vertically [Fig. 2 (A) and (B)]. In practice, this series of steps is instantaneously molded in one step. Also, in FIG.
The crimp claw K formed by the pin 1 for nails and the crimp claw K formed by the pin 1 for four nails of FIG. 7 are formed in almost the same shape.

Here, depending on the material and plate thickness of the caulking claw forming member s, the inclined opening angle θ of the quadrangular pyramidal tip portion 1c of the four claw pin 1 is about 50 degrees to about 90 degrees. Is preferred. For caulking the caulking claw forming member s with the caulking claw K as described above into a workpiece p such as a carton, for the caulking claw forming member s as a cutting blade made of a metal thin plate, The work piece p is pressed by a press.
A cutting blade, which is a caulking claw forming member s, is attached to [see FIGS. 3 (A) and 3 (B)].

At this time, in the caulking attachment method of the cutting blade, the curl degree is an important factor because the curl degree of the curl portion K ₂ of the crimp claw K influences the degree to which the workpiece p is pierced. . The smaller the inclined opening angle θ of the quadrangular pyramidal tip 1c of the four-claw pin 1 of the caulking claw forming pin A, the smaller the degree of curl of the curl part K ₂ of the caulking claw K is as shown in FIG. 11 (A). However, since the curl degree is too large, the workpiece p is omitted as a model as shown in FIG. 11B, but the workpiece p is crushed without being pierced. In some cases, the pyramidal tip 1c
It is necessary that the tilted opening angle θ is about 50 degrees or more.

Further, the larger the inclined opening angle θ of the quadrangular pyramidal tip 1c of the four-claw pin 1 of the crimping claw forming pin A, the greater the
The degree of curling of the curled portion K ₂ of the swaged nail K becomes small [see FIG. 12 (A)], and the raised portion K ₁ becomes almost vertical, and the swaged nail K is crushed by buckling during press working. Therefore, it is preferable that the inclined opening angle θ of the quadrangular pyramidal tip portion 1c approaches approximately 90 degrees [see FIG. 12 (B)].

Further, the gap δ between the column portion 1b of the four-claw pin 1 and the caulking claw forming hole C of the second die D is also an important factor for molding the curl portion K ₂ . Although the material and the plate thickness of the caulking nail forming member s are also affected, if the gap δ is too small, the caulking nail K will be formed as shown in FIG. 13 (A).
Becomes vertical and the curl portion K ₂ does not exist. If the gap δ is too wide, as shown in FIG. 13 (B), the curl portion K ₂ of the crimped nail K has an excessively large curl degree, so that the workpiece p is not stuck. Therefore, for example, about 0.5 mm to about 1.7 mm
A certain interval δ is required. Preferably, in the case of a zinc iron plate having a caulking nail forming member s of about 0.5 mm, the gap δ is
Is preferably about 1.2 mm. Further, in order to always finish the crimping nail K with an orderly cut, it is also necessary to hold the tip of the quadrangular pyramidal tip 1c sharp.

Further, in the case of the caulking claw forming member s having the caulking claws K in the case where the angle of the curl portion K ₂ is preferably formed, depending on the paper quality and the thickness of the workpiece p, 8
As shown in (A), the curled portion K ₂ of the crimped nail K pierces the workpiece p, and then the curled portion K _{2 of the} crimped nail K.
Penetrates through the workpiece p [see FIG. 8 (B)], and the curl portion K ₂ is hidden by being pushed into the inside by a pressure F of a ton by pressing [FIG. 3].
(B), FIG. 4 (A), and FIG. 8 (C)]. As a result, even if the caulking claw forming member s is touched, the curl portion K ₂ is not touched and the safety can be ensured. In this case, a force is required when the caulking nail forming member s is peeled from the workpiece p.

In addition, when the angle of the curl portion K ₂ is appropriately increased, and in consideration of the paper quality and the thickness of the workpiece p, it is a condition that the caulking nail K pierces the workpiece p. the FIG. 5 (a), the the curled portion K ₂ of the caulking pawl K is formed bent at an intermediate position of the workpiece p, wherein at a pressure F that tons by pressing the curled portion K ₂ Will be pierced at the intermediate position of the work piece p and will be hidden [see FIG. 5 (A)]. To form the curled portion K ₂ of the crimped nail K in this case,
The inclined opening angle θ of the quadrangular pyramidal tip 1c is about 50 degrees to about 65 degrees.
It is preferable to set it to about the degree. As a result, the caulking nail K can be made completely invisible when viewed from below, and the safety can be ensured. In this case, when the caulking nail forming member s is peeled from the work piece p, it can be peeled off with a slight force. Note that when FIG. 5A is viewed from above, it is the same as FIG. 4B.

Next, FIG. 9 shows the second embodiment of the present invention.
Further, referring to FIG. 10, the crimping nail forming pin A is a two-claw pin 2, and the crimping nail K is formed using the two-claw pin 2. In the two-claw pin 2, a quadrangular column portion 2b having a substantially rectangular cross-section is formed on a tip side of a cylindrical base portion 2a (including a perfect circle), and the quadrangular column portion 2b has a long side of the rectangle as a front surface. A pointed portion is formed as a V-shaped tip 2c at the tip of the. Also in the case of the two-claw pin 2, when the square pillar portion 2b of the two-claw pin 2 is inserted into the caulking claw forming hole C, as in the case of the four-claw pin 1. Then, the crimping nail forming is completed. In addition, the inclined opening angle θ of the two-claw pin 2 and the two-claw pin 2 and the caulking claw forming hole C
The gap between and is similar to that in the first embodiment. Further, the caulking nail forming hole C, the first mold B, the second mold D, and the like are the same as in the case of the first embodiment.

The shapes of the two-claw pins 2 shown in FIGS. 9A and 10A are similar, but there is one difference. That is, FIG. 9A shows that the short side of the rectangular section 2b of the quadrangular column 2b is formed in an arc, and FIG. 10A shows that the short side is formed as a straight line.
Further, the manufacturing work of the crimped nail K is the same as in the case of the first embodiment. In particular, when the pin 2 for two claws is formed as the crimped claw K, FIG. 9 (C) and FIG.
As shown in (C), it is formed as a caulking nail K having a substantially rectangular shape instead of a V shape, and in this case also, it has a curl portion K ₂ and a rising portion K ₁ . Other caulking steps are the same as those in the first embodiment. Further, the rising portion K ₁ and the curl portion K ₂ formed by the two-jaw pin 2 of FIG. 9A are formed in a slightly arcuate cross section, and the two-jaw pin 2 of FIG. The rising portion K ₁ and the curl portion K ₂ formed in 1) are formed to have straight sections.

[0021]

According to the invention of claim 1, in the caulking attachment method for attaching the cutting blade to the workpiece p such as a carton by caulking, the caulking claw forming member s as a cutting blade made of a thin metal plate is used. And a caulking nail forming pin A having a sharp tip and a circular caulking nail forming hole C are formed, and at the same time the caulking nail forming member s is opened with the caulking nail forming pin A. A burring process is performed to form a curl portion K ₂ that curls the tip slightly outward, and a vertical rising portion K ₁ is continuously formed to bend and form a crimp claw K, and then a carton work piece. By using the caulking attachment method of the cutting blade, the caulking nail forming member s formed by forming the caulking nail K with respect to p is pressed by a press to attach the cutting blade that is the caulking nail forming member s to the workpiece p. , Caulking nails The molding of K can be efficiently manufactured in only one step, and the cutting blade with the crimping nail can be efficiently attached to the paper carton. The caulking claw K forming by this one step can be made significantly more efficient than the conventional two-step forming.

According to the second aspect of the present invention, in the first aspect, a column portion 1b having a substantially square or circular cross section is formed on the caulking nail forming pin A, and a square pyramid is formed at the tip of the column portion 1b. By adopting the caulking attachment method of the cutting blade formed by forming the tip portion 1c, the caulking nail K having four claws can be efficiently manufactured in only one step. Further, by using four claws, the attachment strength to the workpiece p can be made excellent.

Further, in the invention of claim 3, in claim 1, a quadrangular column portion 2b having a substantially rectangular cross section is formed with respect to the crimping claw forming pin A, and a long side of the rectangle is a front surface. Since the V-shaped tip 2c is formed at the tip of the quadrangular pillar 2b, the caulking attachment method of the cutting blade is used, so that the caulking nail K having two claws can be formed in only one step. Also, by using two claws, the attachment strength to the workpiece p can be weakened, and the cutting blade can be easily removed after the wrap or the like in the carton is used up.

Further, in the invention of claim 4, in claim 2 or 3, the inclined open angle of the quadrangular pyramidal tip 1c or the V-shaped tip 2c is set to about 50 to about 90 degrees. By adopting the caulking attachment method of the cutting blade, there is an advantage that the two-claw and four-claw caulking claws K can be finished orderly and neatly.

[Brief description of drawings]

1A and 1B are state diagrams of a crimping nail forming process of a first embodiment of the present invention, and FIG. 1C is a curling portion formed in the crimping nail forming process of a first embodiment of the present invention. The state diagram (D) is a partial perspective view of the caulking claw forming member of (C), and the state diagram (E) is a state diagram (F) in which the rising portion is formed in the caulking claw forming step of the first embodiment of the present invention. ) Is a partial perspective view of the caulking nail forming member of (E)

FIG. 2A is a final state diagram of a caulking nail forming step of the first embodiment of the present invention, and FIG. 2B is a partial perspective view of the caulking nail forming member of FIG.

FIG. 3A is a state diagram in which the caulking claw forming member with a caulking claw according to the first embodiment of the present invention is pressed onto a work piece such as a carton to be a caulking fixed fastener; The state diagram in which the caulking claw forming member with the caulking claw of the first embodiment is pressed and fixed to a workpiece such as a carton by caulking.

FIG. 4A is a cross-sectional view in which the caulking claw forming member with a caulking claw according to the first embodiment of the present invention is pressed onto a workpiece such as a carton and fixed by caulking, and FIG. 4B is X ₁ -X _1; partial plan view of the arrow (C) some rear view of the X ₂ -X ₂ arrow

[5] (A) is a cross-sectional view of a first embodiment of a modification by press caulking fixing the workpiece carton such a caulking claw caulking pawl forming member (B) of the present invention X ₃ some rear view of -X ₃ taken along line

FIG. 6A is a partial perspective view of a pin for four claws. (B) is a bottom view of (A) seen from the lower surface side

FIG. 7 (A) is a partial perspective view of a modified example of a four-claw pin. (B) is a bottom view of (A) seen from the lower surface side

8 (A) and 8 (B) are enlarged state views in the middle of pressing and fixing the member for forming a crimped nail with a crimped nail according to the first embodiment of the present invention onto a workpiece such as a carton. C) is an enlarged state view in which the caulking claw forming member with a caulking claw according to the first embodiment of the present invention is pressed and fixed to a workpiece such as a carton by caulking.

9A is a partial perspective view of a two-claw pin, FIG. 9B is a bottom view of FIG. 9A viewed from the lower side, and FIG. 9C is a caulking claw with the two-claw pin of FIG. Formed perspective view

FIG. 10 (A) is a partial perspective view of a modified example of a two-jaw pin, (B) is a bottom view of (A) seen from the lower side, and (C) is the two-jaw pin of (A). Partial perspective view with swaged claws formed

FIG. 11A is a cross-sectional view when the degree of curl of the crimping nail is large, and FIG. 11B is a cross-sectional view showing the state of the crimping nail with the crimping fixing of FIG. 11A.

FIG. 12 (A) is a cross-sectional view when the curl degree of the crimping nail has almost no curl degree, and FIG. 12 (B) is a cross-sectional view showing the state of the crimping nail with the (A) crimped and fixed.

FIG. 13A is a cross-sectional view when the gap between the crimping nail forming pin and the crimping nail forming hole is small, and FIG. 13B is a cross-sectional view when the gap between the crimping nail forming pin and the crimping nail forming hole is large.

FIG. 14 (A) is a state diagram in which a first stage curl portion in Japanese Patent No. 3170371 is formed, and FIG. 14 (B) shows a second stage caulking claw rising portion in Patent No. 3170371. State diagram

[Explanation of symbols]

A ... caulking pawl forming pin C ... caulking pawl forming holes K ... caulking pawl K ₁ ... rising portion K ₂ ... curl portion p ... workpiece s ... caulking pawl forming member 1 ... 4 nails pins 1b ... Column part 1c ... Square pyramidal tip part 2 ... Two-claw pin 2b ... Square column part 2c ... V-shaped tip part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Eijiro Takeuchi             21 a, 6-9 Fukuda, Yamato City, Kanagawa Prefecture             -Stan Giken Co., Ltd. (72) Inventor Masaaki Meguro             21 a, 6-9 Fukuda, Yamato City, Kanagawa Prefecture             -Stan Giken Co., Ltd. F-term (reference) 3E060 AB01 DA17 DA25 EA08 EA14                 3E075 AA05 BA01 CA01 DE21 GA05

Claims (4)

[Claims] 1. A caulking nail forming method in which a cutting blade is attached to a workpiece such as a carton by caulking, in which a caulking nail forming member having a sharp tip is formed with respect to a caulking nail forming member made of a thin metal plate. A curling part for forming a die comprising a pin for forming a caulking nail and a hole for forming a caulking nail in a circular shape, piercing the member for forming a caulking nail with the caulking nail forming pin and performing burring at the same time, and slightly curling the tip to the outside. To form a vertical rising portion to bend and form the crimping claw, and then press the crimping claw forming member formed by molding the crimping claw onto the workpiece to be carton with a press. A caulking attachment method for a cutting blade, characterized in that a cutting blade serving as a caulking nail forming member is attached to the workpiece. 2. The pillar according to claim 1, wherein the caulking nail forming pin is formed with a pillar portion having a substantially square or circular cross section, and a quadrangular pyramidal tip portion is formed at a tip end of the pillar portion. The caulking installation method for the cutting blade. 3. A quadrangular column portion having a substantially rectangular cross section is formed with respect to the crimp claw forming pin according to claim 1, and a V-shape is formed at a tip of the quadrangular column portion with a long side of the rectangle as a front surface. A caulking attachment method for a cutting blade, which is characterized in that a tip end is formed. 4. The caulking of a cutting blade according to claim 2, wherein the quadrangular pyramidal tip portion or the V-shaped tip portion has an inclined opening angle of about 50 degrees to about 90 degrees. Mounting method.