JP2003053449A - Press die for connecting metallic laminated board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fully prevent a metallic board from falling off or being disengaged. SOLUTION: An engaging projection 10 is provided that has a center projected face 12 protruding on the engaging surface 11 of a male die 1 and a pair of slopes 13a inclining from the projected face 12 toward the engaging surface 11. With an edge formed on the outside line in the width direction of the slopes 13a and on the outside line of the projected face 12 for connecting them, two main cut lines are prepared in the engaging projection 10. In addition, for the purpose of performing tension cutting, the interval of the main cut lines on the projected face 12 of the male die 1 is formed smaller by a prescribed dimension that the interval of the main cut lines of the corresponding female die 2. Further, a pressing projection 25 for pressing to open the cut end of the laminated metallic board is formed in a position along the main cut lines in the engaging recess 20 of the female die 2 that receives the projected face 12, and a clearance groove 50 is provided for the laminated metallic board nearly in the center of the pressing projection 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press metal used for joining laminated metal plates such as metal gaskets formed by laminating a plurality of substrates or substrates and sub-plates. Regarding the type.

[0002]

2. Description of the Related Art Conventionally, a metal gasket formed by stacking a plurality of metal plates has a tongue-like joint portion formed on the outer peripheral edge of the engine block and the cylinder head, which is separated from the joint surface. By forming a through hole in the part to form an eyelet or welding this part,
A plurality of metal plates are joined in the stacking direction.

However, the fitting method not only increases the number of parts, but also the joining work is troublesome, and the welding method reduces the work effort, but not only the facility cost but also between the metal plates at the time of welding. Since there is a problem such as deviation, a method for facilitating the joining work is required. In order to meet such a demand, Japanese Patent Laid-Open No. 6-281011 discloses a method of connecting metal gaskets by press working. In this method, a plurality of independent cutting lines are formed on the stacked metal plates, and at the same time, the metal plate portion between the cutting lines is projected in the stacking direction with a step greater than the thickness of the stacked plate to form a protruding portion, Further, a part of the cutting line has a burr at the cutting end as a breaking line due to stretching.

In this method, due to the contact between the end faces of the side to be cut and the end faces of the projecting portion at both ends of the cutting line between the laminated metal plates, the deviation in the plate surface in the direction intersecting the direction in which the cutting line extends. It is said that the displacement is prevented and the spring back of the burr prevents the metal plates from coming off in the stacking direction. However, in the coupling structure described in Japanese Patent Laid-Open No. 6-281011, the tips of the burrs overlap with each other when viewed from the stacking direction due to the spring back of the burrs, and this overlapping part prevents the burrs from coming off. The spring-back overlap was not enough to prevent the slip-out. Further, in order to prevent the displacement of the laminated metal plate in the plate surface in all directions, it is necessary to form three or more cutting lines as shown in FIGS. 23 and 24, and such a joint structure is formed. The mold used to do this has a rather complicated structure and is fragile and costly.

Therefore, in order to solve such a problem, the applicants of the present invention have proposed a method for laminating laminated metal plates described in JP-A-9-141351. In this joining method, two independent cutting lines are formed on the stacked metal plates, and the metal plate portion between the cutting lines is projected in the stacking direction with a step larger than the thickness of the stacked plates to form a protruding portion. do it,
A method of joining stacked metal plates together, wherein after forming the protrusion, the cut end of the metal plate is crushed and spread to form a cut end of the protrusion and a cut end of the metal plate. Are stacked in the stacking direction to prevent the metal plates from coming off in the stacking direction.

[0006]

However, in the one disclosed in Japanese Patent Application Laid-Open No. 9-141351, depending on the difference in steel type between the laminated metal plates or the steel type of all the metal plates to be laminated, The formation of the protruding portion at the cutting position is small, and due to the reason that the overlapping of the protruding portions in the stacking direction is not sufficiently formed, the metal plate may come off, or the metal plate removal prevention function may become insufficient. It is possible.

Therefore, by further improving the above-mentioned invention, the present inventor not only depends on the difference in steel type but also when metal plates of the same steel type of high hardness with poor elongation are laminated, the metal plates can The present invention has been made for the purpose of sufficiently preventing the slippage or disengagement. The present invention has been made to solve such inconvenience, and an object of the present invention is to provide a pressing die used for joining laminated metal plates capable of sufficiently preventing the metal plates from coming off or coming off. To do.

[0008]

In order to achieve the above-mentioned object, the invention according to claim 1 forms two mutually independent main cutting lines on a laminated metal plate, and between the main cutting lines. A metal mold part for pressing is formed by projecting a metal plate part in the stacking direction at a step larger than the thickness of the stacked plate to form a projecting part, which is a die for press used to bond the stacked metal plates together. An engaging projection having a central protruding surface protruding in a dimension larger than the laminated thickness of the metal plate and a pair of inclined surfaces inclined from the protruding surface toward the engaging surface. And a blade is formed on the widthwise outline of the slope and the outline of the projecting surface connecting them to provide two main cut lines on the engaging protrusion, and a male cut line is formed to perform pull cutting. Between the main cut lines on the central protruding surface of the mold Is formed smaller by a predetermined dimension than the corresponding female main cut line interval, and further, the cut end of the laminated metal plate is placed at a position along the main cut line in the female engagement recess that receives the protruding surface. It is characterized in that a pressing convex portion that spreads out is formed and an escape groove of the laminated metal plate is formed substantially in the center of the pressing convex portion.

According to a second aspect of the present invention, in the first aspect, the male sloped surface is provided so as to incline by extending the hem from the protruding surface toward the engagement surface.
According to a third aspect of the present invention, in the first or second aspect, a lower surface lower than the slope is inserted into the male-type slope continuously with the engaging surface, and the outline of the slope on the side of the lower surface is formed. And a sub-cut line is provided on the engaging convex portion.

According to a fourth aspect of the present invention, in the third aspect, the lower surface of the male die has the same height as the engaging surface of the male die.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory perspective view for explaining a male die and a female die of a press die used for joining laminated metal plates, which is an example of an embodiment of the present invention, and FIG. 2 is a die face of the male die. A plan view, FIG. 3 is a view seen from the direction of arrow A in FIG.
4 is a view as seen from the direction of arrow B in FIG. 2, FIG. 5 is a plan view of the female mold surface, FIG. 6 is a sectional view taken along line CC of FIG. 5, and FIG. 7 is a sectional view taken along line DD of FIG. FIG. 8 is an explanatory cross-sectional view for explaining the engagement state of the male mold and the female mold in the JJ line cross section of FIG. 5,
9 is an enlarged view of an E portion of FIG. 8, FIG. 10 is an explanatory cross-sectional view for explaining an engagement state between the male mold and the female mold in a cross section taken along line DD of FIG. 5, and FIG. 11 is F of FIG. 12 is an enlarged view of FIG.
1 is a view seen from the direction of arrow G, and FIG. 13 is a plan view showing a combined structure of laminated metal plates.

In FIG. 1, reference numeral 1 is a male type and 2 is a female type. In this figure, both molds 1 and 2 are shown in a perspective view,
For convenience of description, the perspective directions of the molds 1 and 2 are different so that the engaging surfaces 11 and 21 of the molds 1 and 2 can be seen. First, the male mold 1 will be described with reference to FIGS. 1 to 4.
In this male mold 1, an engaging protrusion 10 having a substantially trapezoidal longitudinal section is formed in the center of an engaging face 11 which is an end face of a cylinder. From the center of T
It has a small circular projecting surface 12 projecting from and a pair of slopes 13a inclined from the projecting surface 12 toward the engaging surface 11. The size T is larger than the thickness of the laminated plates to be joined.

The slope 13a extends from the small arc 12a of the protruding surface 12 toward the large arc 11b on the engaging surface 11.
Inclined to the side 180 ° apart while widening the hem. However, as will be described later, since the male mold 1 and the female mold 2 are provided with sub-cut lines R1 and R2 in addition to main cut lines P1 and P2, both slopes 13a are not in a 180 ° angular relationship, It may be at another angle.

Further, each of the slopes 13a has a lower portion 13c having the same height as the engaging surface 11 from the side of the large arc 11b, and as a result, each slope 13a is sandwiched between the lower portions 13c and left and right. It is bifurcated. Further, the widthwise outline of the slope 13a is the engagement surface 11 in plan view.
A radial portion 14a extending radially at intervals of 90 ° around the center 11a of the circle forming the circle and an arc portion 1 connecting the radial portion 14a and each end point of the small arc 12a of the projecting surface 12.
4b and. A protrusion line K (radial portion 14a, which is formed by the radial portion 14a and the circular arc portion 14b and the circular arc 12b where the slope 13a of the protruding surface 12 is not continuous).
A main cut line P1 is formed along the arc portion 14b, the arc portion 12b, the arc portion 14b, and the radial portion 14a in this order.

Further, each large arc 11 is formed on each slope 13a.
The lower portion 13c, which is inserted so as to enter the center 11a of the circle from b, has the same height as the engaging surface 11 as described above, and the engaging surface 11 extends from the edge of the slope 13a. Up to a vertical angle, so that along the edge of the slope 13a on the lower portion 13c side,
A sub cut line R1 is formed. In this embodiment, the sub-cut line R1 has a U-shape that follows the contour of the lower portion 13c, but it may have another shape such as a square concave depending on the planar shape of the lower portion 13c. May be.

As shown in FIGS. 5 to 7, the female die 2 has an end face of a cylinder as an engaging surface 21, and the engaging surface 21 is engaged with the engaging convex portion 10 of the male die 1 described above. It has a recess 20. The engaging concave portion 20 is formed as a hole that has a cross-sectional shape perpendicular to the axial direction of the cylinder that is equal to the planar shape of the engaging convex portion 10 and that is continuous in the axial direction. Then, a line H (radial portion 24a, arc portion 24b) on the engaging surface 21 corresponding to the projecting line K of the male die 1 (same as the main cut line P1),
Arc 22b, arc portion 24b, and radial portion 24a
A main cut line P2 is formed along the above.

Further, in accordance with the planar shape of the lower portion 13c of the male die 1 described above, the female die 2 has a protrusion 21c which is inserted into the engaging recess 20 toward the center 21a of the engaging recess 20. And the upper surface is higher than the engaging surface 21. A female-side sub-cut line R2 is formed at the edge of the protruding portion 21c on the engagement recess 20 side.

The radial portion 24a of the line H is the male mold 1
It is formed so that a gap does not occur between the radial portion 14a of the projecting line K (there is a normal gap necessary for shearing) at the time of engagement with, and the sub-cut line R1 of the male die 1 and the female die. A gap is not formed between the two sub-cut lines R2 when the two molds 1 and 2 are engaged, but the circular arc portion 24b and the circular arc 22b are the same as those of the male mold 1.
When engaging with the circular arc portion 14b of the protruding line K and the circular arc 1
2b, the diameter A (shown in FIG. 7) of the circle containing the arc 22b is adjusted so that a predetermined gap (a gap for tensile cutting, not shearing) is generated. It is made larger than the diameter a (shown in FIG. 3) by a predetermined dimension.

Further, the female die 2 has an engaging recess 2 in a plan view.
An arc portion 24b of 0 is an inner peripheral line 25a, an arc having the same center 21a as the engaging surface 21 and slightly inside the end of the radial portion 24a is an outer peripheral line 25b, and the projecting surface is parallel to the engaging surface 21. It has the pressing convex part 25. That is, the pressing protrusions 25 are formed on both sides of the arc 22b (one at each of four positions) along both main cut lines P2 of the engaging recesses 20 of the female die 2. Thereby, the clearance groove 5 of the laminated metal plate S is provided between the pressing protrusions 25 adjacent to each other.
0 is formed.

The protrusion height t (see FIG. 7) of the protrusion 25 from the engagement surface 21 is set sufficiently smaller than the height T (see FIG. 3) of the engagement protrusion 10 of the male die 1. However, these heights t and T and the thickness L of the laminated metal plates to be combined are set to satisfy the relationship of the following formula (1). (T-t)> L (1) The laminated metal plate S is sandwiched between the engaging surface 11 of the male die 1 and the engaging surface 21 of the female die 2 as shown in FIGS. As shown in FIG. 13, by inserting the male mold 1 into the female mold 2 facing the male mold 1, the two main mold lines P1, P1, P2, P2 independent from each other as shown in FIG. Cutting line 3a, sub-cutting line 3c along the sub-cut lines R1, R1, R2, R2, and these cutting lines 3a, 3a, 3c, 3
A coupling structure 3 is formed which includes a metal plate portion between c and a protruding portion 3b protruding in the laminating direction with a step larger than the laminated plate thickness.

The projecting portion 3b has a central portion 32 corresponding to the highest projecting surface of the male die 1 and the slope 1 of the male die 1 which is inclined from the central portion 32 toward the lower side with its skirt widening.
3a and a pair of inclined surface portions 33. Further, as shown in FIG. 13, in each main cutting line 3a, the slope forming line 34a forming the slope portion 33 radially extends at 90 ° intervals from the center point 32A of the central portion 32 in a plan view, and thus the laminated metal plate. Depending on the contact between the end surface of the side to be cut and the end surface of the inclined surface portion 33 at both ends of the main cutting line 3a,
Misalignment between the metal plates in all directions of the plate surface of the laminated metal plate S is prevented.

Further, the laminated metal is also hit by the contact between the end face to be cut and the slope portion 33 along the auxiliary cutting line 3c formed by the edges of the lower portion 13c of the male die 1 and the protruding portion 21c of the female die 2. Misalignment between the metal plates in all directions on the plate surface of the plate S is prevented. In the illustrated embodiment, both of the sub-cutting lines 3c face each other and are U-shaped, so that the deviation directions to be prevented are the respective directions on the surface of the laminated metal plate.

That is, as shown in FIG. 13 (b), each slope forming line 34a and each sub-cutting line 3c can prevent all deviations in the eight directions indicated by the arrows. Further, referring to FIG. 8 to FIG. 12, the main cut line P1 interval (dimension a) at the protruding surface 12 of the engaging projection 10 of the male die 1 is
Since it is smaller than the interval (dimension A) of the main cut line P2 of the engaging concave portion 20 of the female die 2 corresponding thereto, both ends of the central portion 32 of the projecting portion are inserted into the engaging convex portion 10 and the male die 1 and the female die 1 are engaged. It is stretched in the stacking direction and tensilely cut (broken) in the gap M caused by the dimensional difference (Aa) between the main cut lines P1 and P2 with the mold 2.

Thereby, the cut end 32 of the central portion 32
“A” has a jagged (burr) cross section that has a large resistance in the pulling direction. In addition to this, after the engagement surface 11 of the male die 1 reaches the upper surface of the laminated metal plate S, lamination is performed between the upper surface of the pressing convex portion 25 of the female die 2 and the engagement surface 11 of the male die 1. When the metal plate S is pressed, the cut end portion 36 of the laminated metal plate S from which the central portion 32 is separated is crushed and spreads in the gap M, so that the cut end portion 32a and the cut end portion 36 are separated from each other. The catching margin due to burrs becomes large, and particularly at the position where the escape groove 50 of the female die 2 shown in FIGS. 10 to 12 is formed, the escape groove 50 makes it difficult for the laminated metal plate S to break during the breaking step. Since the metal plate S is forcibly ruptured while being pulled in, the metal plate S dragged into the escape groove 50 after the rupture elastically restores and spreads both ends of the fracture surface, and the cut end 32a and the cut end 32a The catching margin due to burrs with the cutting end 36 is further increased. Thereby, leakage of the stacking direction can be reliably prevented.

In the method of the present embodiment, the pair of slope portions 33 form the connecting structure 3 in which the skirt is widened and inclined from the circular central portion 32, but the connecting structure 3 to be formed has a different planar shape. It may be one.

[0026]

As is apparent from the above description, according to the first aspect of the present invention, the pushed cut-out end of the metal plate is enlarged to sufficiently overlap the cut end of the protrusion. This can be ensured, and the metal plates can be reliably prevented from coming off in the stacking direction. According to the invention of claim 2, in addition to claim 1, shifts between the metal plates in all directions in the plane of the laminated plate are prevented by the two main cutting lines 1.

According to the invention of claim 3, in addition to claim 1 or 2, the deviation can be prevented also in the sub-cutting line.
The function of preventing the deviation is increased. According to the invention of claim 4,
In addition to the third aspect, the lower surface and the engaging surface can be flush with each other, which facilitates molding of the mold.

[Brief description of drawings]

FIG. 1 is an explanatory perspective view for explaining a male die and a female die of a pressing die used for joining laminated metal plates, which is an example of an embodiment of the present invention.

FIG. 2 is a plan view of a male mold surface.

FIG. 3 is a view as seen from the direction of arrow A in FIG.

FIG. 4 is a view as seen from the direction of arrow B in FIG.

FIG. 5 is a plan view of a die surface of a female die.

6 is a cross-sectional view taken along the line CC of FIG.

7 is a cross-sectional view taken along the line DD of FIG.

8 is an explanatory cross-sectional view for explaining an engaged state of a male die and a female die in a cross section taken along line JJ of FIG.

9 is an enlarged view of part E in FIG.

10 is an explanatory cross-sectional view for explaining an engaged state of the male die and the female die in a cross section taken along line DD of FIG.

11 is an enlarged view of an F portion of FIG.

FIG. 12 is a diagram viewed from the direction of arrow G in FIG.

FIG. 13 is a plan view showing a combined structure of laminated metal plates,
(A) is explanatory drawing of each structure of this coupling structure, (b) is explanatory drawing which shows each effect | action of the slope formation line of a main cutting line, and a sub-cutting line.

[Explanation of symbols]

1 ... Male 2 ... Female 3 ... Bond structure 3a ... Main cutting line 3b ... projection 3c ... Sub cutting line 10 ... Engaging projection 11 ... engagement surface with female mold 12 ... Projecting surface 13a ... slope 13c ... Lower part 20 ... Engagement recess 21 ... Engagement surface with male type 21c ... projection 25 ... Pressing convex portion 32 ... central part 32a ... Cut end of protrusion 33 ... Slope part 34a ... Slope forming line 36 ... End to be cut S ... Laminated metal plate a ... Main cut line spacing on male protruding surface A: Main cut line spacing on the protruding surface of the female die P1 ... Male main cut line P2… Female main cut line R1 ... Male subcut line R2 ... Female subcut line

Claims (4)

[Claims] 1. Forming two mutually independent main cutting lines on a laminated metal plate, and projecting a metal plate portion between the main cutting lines in the laminating direction with a step larger than the laminated plate thickness. Is a press die used to join laminated metal plates together by forming a protrusion on the engagement surface of the male die with the female die with a dimension larger than the laminated thickness of the metal sheets. An engaging protrusion having a central protruding surface and a pair of inclined surfaces inclined from the protruding surface toward the engaging surface is provided, and a width direction outline of the inclined surface and an outer shape of the protruding surface that connects them. A line is formed with a blade to provide two main cut lines on the engaging convex portion, and the main cut line interval on the central protruding surface of the male mold for pull cutting is set to the corresponding female mold. Specified size from the main cut line interval of And a pressing convex portion that spreads the cut end portion of the laminated metal plate at a position along the main cut line in the female engaging concave portion that receives the protruding surface, and the pressing convex portion is substantially formed. A press die used for joining laminated metal plates, characterized in that an escape groove for the laminated metal plates is formed in the central portion. 2. The press used for joining the laminated metal plates according to claim 1, wherein the male type inclined surface is provided so as to incline with a skirt widening from the projecting surface toward the engaging surface. Mold for. 3. A lower surface lower than the slope is inserted into the male slope continuously with the engagement surface, and a blade is formed on an outline of the slope on the lower surface side to form the engagement protrusion. A die for press used for joining the laminated metal plates according to claim 1 or 2, wherein a sub-cut line is provided in the portion. 4. The pressing die used for joining the laminated metal plates according to claim 3, wherein the lower surface of the male die has the same height as the engaging surface of the male die.