JP5494449B2 - Method and apparatus for punching metal plate and method for manufacturing rotary electric iron core - Google Patents

Description

  The present invention relates to a metal plate made of iron, aluminum, titanium, magnesium and alloys thereof used for automobiles, home appliances, building structures, ships, bridges, construction machines, various plants, hydraulic iron pipes (penstock), etc. The present invention relates to a punching method and a punching apparatus.

  Moreover, this invention relates to the manufacturing method of a rotary electric machine core which uses a magnetic plate punching method of this invention and punches an electromagnetic steel plate into a rotary electric machine core.

  Metal plates used for automobiles, home appliances, buildings, ships, bridges, construction machinery, various plants, hydraulic iron pipes (penstock), etc. are often punched with a punch and die.

  The rotating electrical iron core is manufactured by punching a magnetic metal plate, particularly an electromagnetic steel plate.

  Increasing the number of punched metal plates per unit time is effective in reducing the manufacturing cost of punched products. Therefore, various attempts have been made to simultaneously punch a plurality of metal plates to increase the number of punches per unit time.

  Patent Documents 1 and 2 disclose a method and apparatus for performing punching by arranging a plurality of punches and dies in a punching apparatus.

  Patent Document 3 discloses a method of stacking a plurality of metal plates and punching the stacked metal plates at a time.

JP 2002-160196 A JP 2002-28737 A JP-A-8-300061

  However, although the punching method and apparatus disclosed in Patent Documents 1 and 2 are simple methods, the number of molds that can be installed is determined depending on the size of the mold including the punch and the die. Accordingly, the number of punched products obtained by a single punching process is limited.

  When the projected area in the direction perpendicular to the plate thickness direction of the punched product is large, the projected area in the direction perpendicular to the punching direction of the die composed of the punch and the die becomes large. Therefore, the number of molds attached to the punching device is particularly limited, and the number of punched products is very small out of the number obtained by one punching.

  The punching method disclosed in Patent Document 3 is effective when punching a brittle material, but when punching a ductile material, large sagging and burrs are generated in the punched product.

  In general, a punched portion when a metal plate is punched takes a form as shown in FIG. FIG. 1 is a longitudinal sectional view in the plate thickness direction showing a part of a punched portion when a metal plate is punched.

  As shown in FIG. 1, the punched surface has a sag 2, a shear surface 3, a fracture surface 4, and a burr 5. The sagging 2 is formed by pressing the metal plate 1 entirely with a punch. The shear surface 3 is formed by the metal plate 1 being drawn into the gap (clearance) between the punch and the die and locally stretched. The fracture surface 4 is formed by breaking the metal plate 1 drawn into the gap (clearance) between the punch and the die. The burr 5 is generated on the surface of the metal plate 1 opposite to the punch entry side.

  The sag 2 and the burr 5 are larger when the metal plates 1 are stacked and punched than when the metal plates 1 are punched one by one. In order to reduce the sagging 2 and the burr 5, it is proposed in Patent Document 3 to make a pilot hole (a hole having a smaller diameter than the hole to be punched) in advance in the metal plate 1 to be punched.

  FIG. 2 is an explanatory view showing the form of the metal plate in a cross section in the plate thickness direction when the metal plates are simply laminated and punched. 2A shows a case where there is no pilot hole, and FIG. 2B shows a case where there is a pilot hole.

  However, as shown in FIG. 2 (b), even if the metal plates 1a to 1c provided with the pilot holes 6a to 6c are simply laminated and punched with the punch 11 and the die 12, the punching scraps are not removed. By escaping into the holes 6a to 6c, the size of the sagging 2 and the burr 5 was only slightly reduced.

  Therefore, the punching method disclosed in Patent Document 3 has a problem that although the number of punched products obtained by one punching process is large, the quality of the punched product is inferior.

  In order to solve the above-described problems, the present invention provides a metal plate that has a sagging and burr size that is equivalent to that obtained when the metal plates are punched one by one even when the metal plates are stacked and punched. An object of the present invention is to provide a punching method and apparatus.

  The present inventors diligently studied a method and apparatus for stacking and punching metal plates. First, the reason why the sagging and burrs become large when a conventional metal plate is simply laminated and punched at once was verified by numerical analysis.

  FIG. 3 is an explanatory view showing a result of a numerical analysis of the state of the metal plate when the metal plates are simply laminated and punched at once with a punch and a die, in a plate thickness direction cross section. As apparent from FIG. 3, when the five metal plates 1a to 1e are simply laminated and punched at once, the punch and die are not in contact with the metal plates 1a to 1e. The burr was found to be large.

  Therefore, the inventors attached one end of the punch to a punch plate extending in a direction perpendicular to the punching direction, the surface of the die facing the punching direction, and the punching direction of the punch plate The surface opposite to the surface and the surface on the opposite side were separated by a supporting means, and the punch plate and the die were used as a pair of punching tools.

  Then, the inventors tried to punch a metal plate by stacking n pairs of the punching tools in a pair in the punching direction. At this time, the n pairs of punching tools stacked were defined as the first pair from the punching start side, and the pair farthest from the punching start side was defined as the nth pair.

  As a result, the punch plate of the first pair of punching tools is moved in the punching direction, and the other end of the punch attached to the first pair of punch plates and the die of the first pair of punching tools are used. It has been found that the first pair of metal plates can be punched alone.

  Further, the punch plate included in the first pair of punching tools is provided with means for pushing out the punch plate included in the second pair of punching tools in the punching direction, so that the first pair of punching tools is installed. It has been found that the metal plate installed in the second pair of punching tools can also be punched alone, a little behind the metal plate.

  The punch plate included in the i-th (i = 1 to n) punching tool is also provided with means for pushing out the punch plate included in the (i + 1) -th punching tool, so that the first to n-th punching tools are provided. It was also found that the metal plates installed in the punching tools up to the pair can be sequentially punched independently.

  Furthermore, it has been found that when punched in this way, the punch and die of each pair of punching tools and the metal plate are directly contacted and punched.

  Moreover, all the metal plates punched in this way were also found to have the same size of sagging and burrs as when the metal plates were punched one by one.

The present invention has been made based on the above findings, and the gist thereof is as follows.
(1) In a punching method of a metal plate in which a metal plate is punched with a punch and a die,
One end of the punch is attached to a punch plate extending in a direction perpendicular to the punching direction, the surface of the die facing the punching direction, and the opposite side of the surface of the punch plate facing the punching direction A punching tool assembling step in which the punching plate and the die are paired with a punching tool, and the surface is separated by a supporting means.
The pair of punching tools are stacked in n pairs in the punching direction, and from the punching start side, a punching tool stacking step as a first to n-th punching tool,
A metal plate installation step of installing the metal plate in the spaced space of each of the first to n-th punching tools;
The punch plate of the i-th pair (i = 1 to n) punching tool is moved in the punching direction, the other end of the punch attached to the punch plate of the i-th pair of punching tool, and the first The die plate of the i pair of punching tools punches the metal plate installed in the spaced space of the i-th pair of punching tools, and the punch plate included in the i-th pair of punching tools Extruding means attached to the metal plate extrude punch plates included in the (i + 1) th pair of punching tools and move the punch plates included in the (i + 1) th pair of punching tools in the punching direction. Process,
The metal plate punching process is started by the movement of the punch plate of the first pair of punching tools in the punching direction, and the separated space of the first pair of punching tools The metal plate punching method is characterized by sequentially punching from the metal plate installed on the metal plate to the metal plate installed in the separated space of the n-th pair of punching tools.

(2) The metal plate punching method is further provided with a metal plate for biasing the metal plate to the die by a metal plate biasing means disposed at an outer edge portion of the metal plate installed in the metal plate installation step. The metal plate stamping method according to (1) above, further comprising:

(3) In the metal plate punching method, the punching product obtained by punching the other end of the punch attached to the punch plate of the i-th punching tool in the metal plate punching step is further provided. (I + 1) A punched product that is captured by unloading means installed on a surface facing the punching direction of a punch plate included in a pair of punching tools and carries the punched product out of a space in which the punching tools are stacked. The metal plate stamping method according to (1) or (2) above, further comprising a carry-out step.

(4) The metal plate punching method further includes a metal scrap removing step of removing metal scrap punched by the i-th pair of punches in the metal plate punching step by blowing compressed air. The metal plate punching method according to (1) or (2) above.

(5) The punching tool assembling step includes a support unit having an elastic body, the surface of the die facing the punching direction and the surface of the punch plate opposite to the surface facing the punching direction. The metal plate punching method according to any one of the above (1) to (4), characterized in that the metal plate is separated at a distance.

(6) Any of the above (1) to (5), wherein in the metal plate installation step, the metal plate is installed by fitting an outer edge portion of the metal plate into a notch provided in the die. The metal plate punching method as described in 2.

(7) In the punching process of the i-th punching tool, the metal plate punching step has one end of the extrusion means inserted into a through hole provided in a die of the i-th punching tool. The metal plate punching process according to any one of (1) to (6), wherein the punch plate included in the (i + 1) th pair of punching tools is pushed out at the other end of the pushing means. Method.

(8) The above-mentioned metal plate punching step, wherein the metal plate after punching is allowed to escape on a divergent surface along the punching direction provided in a die of the i-th pair of punching tools. The metal plate stamping method according to any one of 1) to (7).

(9) The metal plate urging step urges the metal plate to the die by metal plate urging means having an elastic body installed at an outer edge portion of the metal plate installed in the metal plate installation step. The metal plate stamping method according to any one of the above (2) to (8).

(10) The metal plate stamping method according to any one of (1) to (9), wherein the metal plate is supplied in a progressive manner.

(11) The manufacturing method of a rotating electrical machine core, wherein the metal plate is an electromagnetic steel plate, and the rotating electrical machine core is formed by using the metal plate punching method according to any one of (1) to (10). .

(12) A metal plate punching apparatus for punching a metal plate with a punch and a die,
A punch plate extending in a direction perpendicular to the punching direction and having one end of the punch attached thereto;
A space between a surface of the die facing the punching direction and a surface of the punch plate opposite to the surface facing the punching direction is spaced apart, and the punch plate and the die are paired with a punching tool. A supporting means, and
The pair of punching tools are stacked in n pairs in the punching direction to form first to n-th punching tools from the punching start side, and the i-th (i = 1 to n) punching tools. When the other end of the punch attached to the punch plate possessed by punches the metal plate, the punch plate possessed by the (i + 1) pair of punching tools is pushed out, and the punching tool of the (i + 1) pair is punched. Pushing means to move in the direction,
A metal plate stamping apparatus characterized by comprising:

(13) The metal plate punching apparatus further includes metal plate urging means for urging the outer edge of the metal plate installed in the separated space to the die. The metal plate stamping processing apparatus described in 1.

(14) The punch plate possessed by the i-th punching tool on the surface opposed to the punching direction of the punch plate possessed by the (i + 1) -th punching tool is further provided by the metal plate punching device. The above-mentioned (12) or (13), characterized by comprising unloading means for capturing a punched product punched at the other end of the punch attached to the punch and transporting the punched product out of a space where the punching tools are stacked. The metal plate punching processing apparatus described in).

(15) The metal plate punching apparatus further includes compressed air blowing means for removing metal scrap punched by a punch attached to a punch plate included in the i-th punching tool. (12) or the metal plate stamping apparatus as described in (13).

(16) The metal plate punching apparatus further includes a sub guide rod inserted into a through hole provided in the die and having one end attached to the punch plate. The metal plate punching apparatus according to any one of the above.

(17) The metal plate stamping apparatus according to any one of (12) to (16), wherein the support means includes an elastic body.

(18) The pushing means is inserted into a through hole provided in a die of the i-th punching tool, and one end of the pushing means is fixed to a punch plate of the i-th punching tool, The above (12) to (12), wherein when the metal plate installed in the spaced space of the i-th pair of punching tools is punched, the other end of the pushing means protrudes from the through hole. 17) The metal plate stamping apparatus according to any one of 17).

(19) The metal plate stamping apparatus according to any one of (12) to (18), wherein the die has a cutout portion into which an outer edge portion of the metal plate is fitted.

(20) The metal plate stamping apparatus according to any one of (12) to (19), wherein a die of the i-th pair of punching tools has a divergent surface along the punching direction. .

(21) Any one of the above (12) to (20), wherein a thickness of the die in the i-th pair of punching tools has a punching direction thickness of 20 times or more a plate thickness of the metal plate. A metal plate punching device according to claim 1.

(22) The metal plate punching apparatus according to any one of (13) to (21), wherein the metal plate urging means includes an elastic body.

  According to the present invention, each of the laminated metal plates is punched while being in direct contact with the punch and die, so that the size of the sagging and burrs is the same as when punching the metal plates one by one. The number of punched products obtained by a single punching process can be increased while maintaining.

  As a result, according to the present invention, the manufacturing cost of the punched product can be reduced without impairing the quality of the punched product.

It is a plate | board thickness direction longitudinal cross-sectional view which shows a part of punching process part when a metal plate is punched. It is explanatory drawing which shows the form of the metal plate in the case of simply laminating | stacking and punching a metal plate in the plate | board thickness direction cross section of a metal plate. 2A shows a case where there is no pilot hole, and FIG. 2B shows a case where there is a pilot hole. It is explanatory drawing which shows the result of having carried out the numerical analysis about the state of the metal plate when a metal plate is simply laminated | stacked and punched with a punch and die | dye at once in the plate | board thickness direction cross section. It is a plate | board thickness direction sectional drawing of a metal plate which shows a state when a metal plate is installed in the metal plate stamping apparatus used for 1st Embodiment of the metal plate punching method of this invention. It is a sheet thickness direction sectional view of a metal plate which shows the state where the 1st pair of metal plates were punched in the metal plate stamping process. It is a board thickness direction sectional view of a metal plate which shows the state where the 2nd pair of metal plates were pierced in the metal plate stamping process. It is a plate | board thickness direction sectional drawing of a metal plate which shows a state when a metal plate is installed in the metal plate stamping apparatus used for 2nd Embodiment of the metal plate stamping method of this invention. It is plate | board thickness direction sectional drawing of a metal plate which shows a state when a metal plate is installed in the metal plate stamping apparatus used for 3rd Embodiment of the metal plate punching method of this invention.

  The present invention will be described with reference to the drawings. FIG. 4 is a sectional view in the plate thickness direction of the metal plate, showing a state when the metal plate is installed in the metal plate punching apparatus used in the first embodiment of the metal plate punching method of the present invention. In FIG. 4, the code | symbol 10 shows a metal plate stamping apparatus. In FIG. 4, the description on the right side of the alternate long and short dash line is omitted, but the right side of the alternate long and short dashed line has the same structure as that on the left side of the alternate long and short dashed line with the alternate long and short dash line as the axis of line symmetry. The same applies to the descriptions in FIGS.

  The metal plate punching apparatus 10 includes punches 11a to 11c, dies 13a to 13c, punch plates 14a to 14c, and extrusion means 15a to 15c. The punch plates 14a to 14c may be attached to the support column 80 so as to be movable up and down.

  Each of the punches 11a to 11c is attached to the punch plates 14a to 14c at one end 16a to 16c thereof.

  Each of the punch plates 14a to 14c extends in a direction perpendicular to the punching direction (from the top to the bottom in FIG. 4). Each of the punch plates 14a to 14c has pushing means 15a to 15c.

  Of the punch plates 14a to 14c, the uppermost punch plate 14a is pushed out in the punching direction by an upper platen (not shown) such as a press.

  The surface 84a opposite to the surface facing the punching direction of the punch plate 14a and the surface 81a facing the punching direction of the die 13a are spaced apart by the support means 21a to 22a. A space 40a is provided. Here, although two support means 21a-22a were illustrated, it is not restricted to this.

  For example, three or more support means may be installed between the punch plate 14a and the die 13a in the cross section of FIG. Further, the support means may be installed on the cross section on the near side or the back side in FIG.

  Thus, the metal plate 1a can be installed on the die 13a by providing the spaced space 40a without the punch plate 14a and the die 13a contacting each other.

  Similarly, a spaced space 40b is provided between the punch plate 14b and the die 13b. Similarly, a spaced space 40c is provided between the punch plate 14c and the die 13c.

  In this way, each of the dies 13a to 13c forms a pair with the punch plates 14a to 14c and constitutes a punching tool while providing the spaced spaces 40a to 40c. Then, three pairs of this punching tool are stacked in the punching direction.

  The punching direction is a direction (from top to bottom in FIG. 4) from the punch 11a toward the die 13a. The punching start side is the side where the punch plate 14a is located.

  Here, the punch plate 14a and the die 13a are a first pair, the punch plate 14b and the die 13b are a second pair, and the punch plate 14c and the die 13c are a third pair. The lowermost die 13c is placed on a lower platen (not shown) such as a press.

  In the first pair of spaced spaces 40a, the metal plate 1a is installed on a surface 81a facing the punching direction of the die 13a. The same applies to the second pair and the third pair.

  The metal plate 1a is punched by the other end 17a of the punch 11a and the die 13a by moving the punch plate 14a of the first pair of punching tools from the punch 11a toward the die 13a.

  FIG. 5A and FIG. 5B are sectional views in the plate thickness direction of the metal plates 1a to 1c showing the state of the metal plate punching apparatus 10 and the metal plates 1a to 1c in the metal plate punching process. FIG. 5A shows a state in which the first pair of metal plates 1a has been punched, and FIG. 5B shows a state in which the second pair of metal plates 1b has been punched.

  The pushing means 15a inserted through the through hole 50a provided in the die 13 has one end 18a fixed to the punch plate.

  As the punch plate 14a moves, the pushing means 15a attached to the punch plate 14a also moves. When the first pair of metal plates 1a is punched, the other end 19a of the pushing means 15a reaches the end of the through hole 50a in the punching direction, as shown in FIG.

  That is, the length in the punching direction of the extruding means 15a is opposite to the surface of the die 13a facing the punching direction when the metal plate 1a is punched, as shown in FIG. The length reaches the side surface 82a.

  By setting the punching length of the extruding means 15a in this way, the other end 19a protrudes from the through hole 50a as shown in FIG. 5B when the punch plate 14a is further moved in the punching direction. To do.

  The protruding other end 19a pushes the punch plate 14b in the punching direction, and the metal plate 1b installed in the second pair of punching tools is similarly punched. Then, the other end 19b of the pushing means 15b having one end 18b fixed to the punch plate 14b pushes the punch plate 14c in the punching direction.

  In this way, all the metal plates 1a to 1c installed in the first to third pairs of punching tools are sequentially punched in the order of 1a, 1b and 1c. In the present invention, the fact that all the metal plates installed in the first to nth pairs of punching tools are sequentially punched is referred to as one punching.

  In the first embodiment, a form in which three pairs of punch plates and dies each having a punch attached thereto are stacked is shown, but the present invention is not limited to this. The laminated logarithm may be determined according to the stroke of a press machine or the like to be used, but a large number of laminated logs is preferable because productivity is improved.

  In the first embodiment, as shown in FIG. 4, the pushing means 15c is also attached to the punch plate 14c of the third pair of punching tools, but the fourth pair of punching tools is not stacked. The pushing means 15c may be omitted. That is, when n pairs of punch plates and dies are stacked, the extrusion means attached to the punch plates of the n-th pair of punching tools may be omitted.

  Moreover, although 1st Embodiment showed the form which penetrates the extrusion means 15a-15c to the through-holes 50a-50c provided in die | dye 13a-13c, it is not restricted to this.

  For example, the punch plates 14a to 14c may be made larger than the dies 13a to 13c in the direction perpendicular to the punching direction, and the ends 18a to 18c of the pushing means 15a to 15c may be attached to the enlarged portions.

  By doing in this way, extrusion means 15a-15c can be operated on the outside of dies 13a-13c.

  As shown in FIG. 4, the support means 21a and 22a may be any means that can provide a space 40a separated when the metal plate 1a is installed. Further, as shown in FIGS. 5A and 5B, the support means 21a and 21b can reduce the length in the punching direction when the punch plate 14a is moved in the punching direction. I just need it.

  Such support means 21a, 22a is typically an elastic body, but is not limited thereto. When the support means is made of an elastic body, the support means 21a and 22a may recover their original shape when the punch plate 14a is returned to the original position after the metal plates 1a to 1c are punched out. .

  The type of the elastic body is not particularly limited as long as it has the above recovery function, and a helical spring, a disc spring, rubber, or the like can be used.

  When the support means 21a and 22a are not elastic bodies, the support means 21a and 22a may be replaced with new ones after the first punching process.

  The support means 21a and 22a do not need to be elastic bodies as a whole, and may be constituted by an elastic body 31a and a pedestal 32a as shown in FIG. The pedestal 32a can be provided on the die 13a side, the punch plate 14a side, or either one.

  Here, the support means 21a and 22a included in the first pair of punching tools have been described, but the same applies to the support means 21b to 21c and 22b to 22c included in the second and third pairs of punching tools.

  Next, a difference between the second embodiment of the present invention and the first embodiment will be described. FIG. 6 is a cross-sectional view in the plate thickness direction of the metal plate showing a state when the metal plate is installed in the metal plate punching apparatus used in the second embodiment of the metal plate punching method of the present invention. In FIG. 6, the code | symbol 10 shows a metal plate stamping apparatus.

  In the second embodiment, after the metal plate 1a is installed in the spaced space 40a, the metal plate urging means 23a is installed between the punch plate 14a and the outer edge portion 70a of the metal plate 1a.

  As shown in FIG. 6, the metal plate urging means 23a may be any member that can urge the metal plate 1a to the die 13a even before the punch plate 14a is moved in the punching direction. Then, when the punch plate 14a is moved in the punching direction, it is only necessary that the length in the punching direction can be reduced while the metal plate 1a is biased to the die 13a in the same manner as the support means 21a and 22a.

  Such metal plate urging means 23a can be the same as the supporting means 21a and 22a.

  The metal plate urging means 23a prevents the metal plate 1a from being displaced in a direction perpendicular to the punching direction when the metal plate 1a is punched.

  Therefore, not only the dimensional accuracy in the direction perpendicular to the punching direction of the punched product is improved, but also the deformation of the punched surface is prevented, and the height of the burr 5 is reduced.

  Here, the metal plate urging means 23a provided in the first pair of punching tools has been described, but the same applies to the metal plate urging means 23b and 23c provided in the second and third pairs of punching tools.

  Next, differences of the third embodiment of the present invention from the first embodiment and the second embodiment will be described. FIG. 7 is a cross-sectional view in the plate thickness direction of the metal plate, showing a state when the metal plate is installed in the metal plate punching apparatus used in the third embodiment of the metal plate punching method of the present invention. In FIG. 7, the code | symbol 10 shows a metal plate stamping apparatus.

  In 3rd Embodiment, the notch part 60a is provided in die | dye 13a, the outer edge part 70a of the metal plate 1a is inserted in this notch part 60a, and the metal plate 1a is installed.

  By doing in this way, the notch part 60a becomes a target (guide) at the time of installing the metal plate 1a, and the dimensional accuracy in the direction perpendicular to the punching direction of the punched product can be improved.

  Further, after fitting the metal plate 1a into the notch 60a, as shown in FIG. 7, the metal plate urging means 23a is installed, and the same effect as the metal plate urging means 23a of the second embodiment can be obtained. it can.

  Here, the notch portion 60a provided in the die 13a included in the first pair of punching tools has been described. However, the notch portions 60b and 60c provided in the dies 13b and 13c included in the second and third pairs of punching tools. The same applies to.

  In the third embodiment, the die 13a is provided with a diverging surface 75a along the punching direction. The end spread surface 75a faces the space through which the punched metal plate 1a passes, and exists between the surface 81a of the die 13a facing the punching direction and the surface 82a opposite to the surface facing the punching direction. To do.

  The punched metal plate 1a moves in the punching direction. However, if the punching resistance is non-uniform, the surface of the punched metal plate 1a does not always move while maintaining the perpendicular to the punching direction. That is, the punched metal plate 1a does not always move straight in the punching direction.

  For example, when the metal plate 1a is punched from top to bottom as shown in FIG. 7, the punched metal plate 1a does not always fall straight.

  There is no end spreading surface 75a, and the surface 81a of the die 13a facing the punching direction and the surface 82a opposite to the surface facing the punching direction are connected by a surface indicated by a broken line in FIG. In this case, if the punched metal plate 1a does not move straight in the punching direction, the outer periphery of the punched metal plate 1a is easily caught on the surface indicated by the broken line.

  If the end spread surface 75a is provided, the punched metal plate 1a can escape to the end spread surface 75a, that is, the left side of the broken line in FIG. As a result, not only can the punched metal plate 1a be carried out smoothly, but it is also possible to prevent the metal plate punching apparatus 10 from being obstructed.

  The punched metal plate 1a includes both a case where it is used as a punched product and a case where it is discarded as metal scrap. In addition, the case where it becomes metal scrap is a case where a punching process is further performed on a product that has already been punched to punch a small decorative hole or the like.

  When the punched metal plate 1a becomes scrap metal, the scrap is likely to occur because the scrap metal is often deformed, such as curling.

  Further, the metal plate 1a is punched by the punch 11a and the die 13a. However, metal scrap generated when the metal plate 1a is punched by the punch 11a is in the gap (clearance) between the punch 11a and the die 13a. It may be caught. Such catching of metal scraps or pinching of metal scraps into the gaps hinders the operation of the metal plate punching apparatus 10.

  Therefore, when the punched metal scrap 1a is discarded as metal scrap, it is particularly effective to provide the diverging surface 75a from the viewpoint of smooth operation of the metal plate punching apparatus 10.

  Here, the divergent surface 75a provided on the die 13a of the first pair of punching tools has been described. However, the divergent surfaces 75b and 75c provided on the dies 13b and 13c of the second and third pairs of punching tools are also described. It is the same.

  Furthermore, in the third embodiment, the metal plate punching apparatus 10 has a carry-out means 76b on the surface 83b facing the punching direction of the punch plate 14b.

  When the punched metal plate 1a is used as a punched product, as shown in FIG. 7, unloading means 76b for capturing the punched product is provided on a surface 83b of the punch plate 14b facing the punching direction. It is preferable to install.

  The unloading means 76b captures the punched product, and the punched product is out of the space where the punching tools are stacked (from the front to the back or from the back to the front in FIG. 7). Is to be carried out.

  With the carrying-out means 76b, the punched product can be taken out without being scratched. As the carry-out means 76b, for example, a cloth belt or a rubber belt is preferable.

  Similarly, the unloading means 76c can be installed in the punch plate portion 14c. The uppermost punch plate 14a does not need to capture a punched product, so that no carry-out means is necessary.

  When the punched metal plates 1a and 1b are metal scraps, they may be removed by blowing compressed air onto the metal scraps captured by the carry-out means 76b and 76c. This is because the metal scraps are discarded, and need not be taken out carefully by the carrying-out means 76b and 76c.

  In addition, when removing metal waste by blowing compressed air, the carry-out means 76b and 76c are not installed, and metal waste is captured (dropped) directly on the surface facing the punching direction of the punch plates 14b and 14c. Alternatively, it may be removed by blowing compressed air.

  Further, sub guide rods 77a to 77c may be provided. The sub guide rods 77a to 77c are inserted into through holes 51a to 51c provided in the dies 13a to 13c, respectively. One end of the sub guide rod is fixed to the punch plates 14a to 14c.

  The clearance (clearance) between the outer periphery of each of the sub guide rods 77a to 77c and the inner periphery of each of the through holes 51a to 51c is when the punch plates 14a to 14c are moved in the punching direction or in the direction opposite to the punching direction. In addition, it is preferable that the punch plates 14a to 14c have a degree that does not cause a shift in a direction perpendicular to the punching direction.

  Thereby, not only the dimensional accuracy in the direction perpendicular to the punching direction of the punched product is improved, but also the deformation of the punched surface is prevented, and the height of the burr 5 can be reduced.

  The sub guide rods 77a to 77c are arranged in a direction perpendicular to the punching direction of the punch plates 14a to 14c when the pushing means 15a to 15c are not inserted into the through holes 50a to 50c provided in the dies 13a to 13c. This is particularly effective for reducing the deviation.

  This is because when the push-out means 15a to 15c are inserted through the through holes 50a to 50c, the push-out means 15a to 15c also serve as a guide when moving the punch plates 14a to 14c.

  Further, the length of the sub guide rod 77a is made shorter than the length of the pushing means 15a. When the metal plate 1a is punched and the punch plate 14a is further moved in the punching direction, the protruding amount of the pushing means 15a from the die 13a is made longer than the protruding amount of the sub guide rod 77a. This is because the pushing means 15a pushes the punch plate 14b. Further, the sub guide rod 77a may not protrude from the die 13a. The same applies to the lengths of the sub guide rods 77b and 77c.

  Next, the relationship between the punching direction thickness of the dies 13a to 13c and the plate thickness of the metal plates 1a to 1c will be described. This relationship applies to all of the first to third embodiments described above.

  The thickness in the punching direction of the dies 13a to 13c is preferably 20 times or more the plate thickness of the metal plates 1a to 1c.

  If the die-cutting direction thickness of the dies 13a to 13c is less than 20 times the plate thickness of the metal plates 1a to 1c, the rigidity of the dies 13a to 13c is insufficient. Thereby, when the metal plates 1a to 1c are punched, the deformation of the dies 13a to 13c is increased, and the effect of reducing the size of sagging and burrs is reduced.

  On the other hand, if the thickness in the punching direction of the dies 13a to 13d exceeds 100 times the thickness of the metal plates 1a to 1c, the material cost of the dies 13a to 13d is increased, and the size of sagging and burrs is reduced. The effect remains the same.

  Therefore, it is preferable that the thickness in the punching direction of the dies 13a to 13c is not more than 100 times the thickness of the metal plates 1a to 1c.

  Next, the case where the punching process of a different shape is given to one metal plate with the metal plate punching method and apparatus of this invention is demonstrated.

  In any case of the first to third embodiments described so far, it is preferable that a plurality of metal plate punching apparatuses 10 for performing different punching processes are arranged in the feeding direction of the metal plate coil to adopt a progressive feeding method. .

  This is because the number of man-hours for transferring the metal plates between the plurality of metal plate punching apparatuses 10 before the final punching shape is obtained can be significantly reduced.

  Moreover, this invention is applicable not only to the metal plate of a steel-type material but to the metal plate of a nonferrous metal material. Examples of the steel material include mild steel plates and electromagnetic steel plates. Examples of non-ferrous metal materials include aluminum plates and copper plates. Among these, when the present invention is applied to an electromagnetic steel sheet and a rotating electrical iron core is manufactured, the size of sagging and burrs can be suppressed as compared to when the electromagnetic steel sheet is simply laminated and punched, Particularly preferred.

  Next, the present invention will be further described with reference to examples. Conditions in the examples are one example of conditions adopted to confirm the feasibility and effects of the present invention, and the present invention is examples of these one condition. It is not limited to. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

  A plate thickness: 2.0 mm mild steel plate, a plate thickness: 2.5 mm aluminum plate, a plate thickness: 0.2 mm electromagnetic steel plate were prepared, and the metal plate stamping apparatus 10 of the first embodiment shown in FIG. Using, three metal plates were punched out.

  Regarding the electromagnetic steel plates, five electromagnetic steel plates were punched by the metal plate punching apparatus 10 of the first embodiment shown in FIG.

  As for the electromagnetic steel sheets, three electromagnetic steel sheets were punched by the metal plate punching apparatus 10 of the second and third embodiments shown in FIGS. 6 and 7.

  The burr height h (mm) was measured for each punched metal plate. As shown in FIG. 1, the burr height h (mm) is the distance from the tip of the burr 5 to the surface opposite to the surface facing the punching direction of the metal plate.

  As a comparative example, a burr when a sheet thickness: 2.0 mm mild steel sheet, a sheet thickness: 2.5 mm aluminum sheet, and a sheet thickness: 0.2 mm electromagnetic steel sheet are simply laminated and punched three by three. Height h (mm) was measured.

  As a conventional example, burr height h (mm) when punching each one of a mild steel plate with a thickness of 2.0 mm, an aluminum plate with a thickness of 2.5 mm, and an electromagnetic steel plate with a thickness of 0.2 mm. ) Was measured.

  The results are shown in Table 1.

  As is clear from Table 1, in the present invention example, it was confirmed that all metal plates could be punched with a burr height h (mm) equivalent to that when punching one by one (conventional example). did it.

  On the other hand, in any of the comparative examples, it was confirmed that the burr height h (mm) was larger than that of the example of the present invention.

  And among the examples of the present invention, the electromagnetic steel plates (metal plates) 1a to 1c are urged to the dies 13a to 13c by the metal plate urging means 23a to 23c for the electromagnetic steel plates punched by the metal plate punching apparatus 10 of FIG. Therefore, it was confirmed that the burr height h (mm) of the punched electromagnetic steel plates (metal plates) 1a to 1c was further reduced.

  Moreover, among the examples of the invention, when the electromagnetic steel plates (metal plates) 1a to 1c are punched by the metal plate punching apparatus 10 of FIG. 7, the electromagnetic steel plates (metal plates) 1a are punched by the metal plate punching apparatus 10 of FIG. It was confirmed that a burr height h (mm) equivalent to that obtained by punching ˜1c was obtained.

  When the electromagnetic steel plates (metal plates) 1a to 1c are punched by the metal plate punching device 10 of FIG. 7, the electromagnetic steel plates (metal plates) 1a to 1c are not punched by the punching device having no diverging surfaces 75a to 75c. Compared to the case of punching out, it was also confirmed that the punched electrical steel sheet was caught and metal scraps were caught in the gap (clearance), and there were fewer operational problems.

  In addition, the place mentioned above is only what illustrated embodiment of this invention, and this invention can add a various change in a claim.

  For example, in the first to third embodiments, the form in which the metal plates 1a to 1c are punched from the top to the bottom has been shown. However, the present invention is not limited to this. For example, the metal plates 1a to 1c may be punched from the bottom to the top. .

  In this case, a punched product gripping robot or the like may be installed to take measures such as taking out the punched product.

  Alternatively, if the metal plates 1b and 1c are magnetic materials, the carry-out means 76b and 76c are used as magnetic net belts, and the metal plates 1b and 1c punched out by the action of magnetism are transferred to the carry-out means 76b and 76c. It only has to be captured.

  If the metal plates 1b and 1c are not a magnetic material, a suction device may be provided in the carry-out means 76b and 76c so that the punched metal plates 1b and 1c are captured by the carry-out means 76b and 76c.

  As described above, according to the present invention, it is possible to increase the number of punched products obtained by a single punching process with the same size of sagging and burrs as when punching metal sheets one by one. As a result, the manufacturing cost of the punched product can be reduced without deteriorating the quality of the punched product. The present invention has a remarkable effect industrially.

  In addition, according to the present invention, since punching is performed by laminating metal plates, it is not necessary to increase the number of molds composed of punches and dies, so that punching is performed once in a limited space. It is possible to increase the number of punched products obtained in. The present invention has high industrial utility value.

1, 1a to 1e Metal plate 2 Sag 3 Shear surface 4 Fracture surface 5 Burr 6a to 6b Pilot hole 10 Metal plate punching device 11a to 11c Punch 13a to 13d Die 14a to 14c Punch plate 15a to 15c Extruding means 16a to 16c, 18a-18c One end 17a-17c, 19a-19c The other end 21a-21c, 22a-22c Support means 23a-23c Metal plate biasing means 31a-31c, 33a-33c, 35a-35c Elastic bodies 32a-32c, 34a-34c, 36a to 36c Pedestal 40a to 40c Separated space 50a to 50c Through hole 60a to 60c Notch portion 70a to 70c Outer edge portion 75a to 75c End-spread surface 76b to 76c Unloading means 77a to 77c Sub guide rod 80 Strut 81a to 81d In the punching direction Surfaces 82a to 82d Surfaces opposite to the surface facing the die punching direction 83a to 83c Surfaces facing the punching direction of the punch plate 84a to 84c Opposite to the surface facing the punching direction of the punch plate surface

Claims (22)

In the punching method of the metal plate that punches the metal plate with a punch and die,
One end of the punch is attached to a punch plate extending in a direction perpendicular to the punching direction, the surface of the die facing the punching direction, and the opposite side of the surface of the punch plate facing the punching direction A punching tool assembling step in which the punching plate and the die are paired with a punching tool, and the surface is separated by a supporting means.
The pair of punching tools are stacked in n pairs in the punching direction, and from the punching start side, a punching tool stacking step as a first to n-th punching tool,
A metal plate installation step of installing the metal plate in the spaced space of each of the first to n-th punching tools;
The punch plate of the i-th pair (i = 1 to n) punching tool is moved in the punching direction, the other end of the punch attached to the punch plate of the i-th pair of punching tool, and the first The die plate of the i pair of punching tools punches the metal plate installed in the spaced space of the i-th pair of punching tools, and the punch plate included in the i-th pair of punching tools Extruding means attached to the metal plate extrude punch plates included in the (i + 1) th pair of punching tools and move the punch plates included in the (i + 1) th pair of punching tools in the punching direction. Process,
The metal plate punching process is started by the movement of the punch plate of the first pair of punching tools in the punching direction, and the separated space of the first pair of punching tools The metal plate punching method is characterized by sequentially punching from the metal plate installed on the metal plate to the metal plate installed in the separated space of the n-th pair of punching tools.   The metal plate punching method further includes a metal plate urging step of urging the metal plate to the die with a metal plate urging means disposed on an outer edge portion of the metal plate installed in the metal plate installation step. The metal plate stamping method according to claim 1, comprising:   In the metal plate punching method, the punched product obtained by punching the other end of the punch attached to the punch plate of the i-th punching tool in the metal plate punching step is the (i + 1) th punching process. A punching product unloading step of capturing the punched product from a space where the punching tools are stacked by capturing with a carrying means installed on a surface of the punch plate of the pair of punching plates facing the punching direction. The metal plate stamping method according to claim 1, wherein the metal plate is punched.   The metal plate punching method further includes a metal scrap removing step of removing metal scrap punched by the i-th pair of punches by blowing compressed air in the metal plate punching step. Item 3. The metal plate stamping method according to Item 1 or 2.   In the punching tool assembling step, the surface of the die facing the punching direction and the surface of the punch plate opposite to the surface facing the punching direction are separated by a supporting means having an elastic body. The metal plate punching method according to claim 1, wherein the metal plate is punched.   6. The metal according to claim 1, wherein in the metal plate installation step, an outer edge portion of the metal plate is fitted into a notch provided in the die and the metal plate is installed. Board punching method.   In the metal plate punching step, one end of the extrusion means inserted through a through hole provided in a die of the i-th pair of punching tools is fixed to a punch plate of the i-th pair of punching tools, The metal plate punching method according to any one of claims 1 to 6, wherein a punch plate included in the (i + 1) th pair of punching tools is pushed out at the other end of the pushing means.   8. The metal plate punching step, wherein the metal plate after punching is released on a divergent surface along the punching direction provided in a die of the i-th pair of punching tools. The metal plate punching method according to any one of the above.   The metal plate biasing step biases the metal plate to the die by metal plate biasing means having an elastic body installed at an outer edge portion of the metal plate installed in the metal plate installation step. Item 9. The metal plate stamping method according to any one of Items 2 to 8.   The metal plate stamping method according to any one of claims 1 to 9, wherein the metal plate is supplied in a progressive manner.   The said metal plate is an electromagnetic steel plate, It is set as a rotary electric machine core using the metal plate stamping method of any one of Claims 1-10, The manufacturing method of the rotary electric machine core characterized by the above-mentioned. A metal plate punching device that punches a metal plate with a punch and a die,
A punch plate extending in a direction perpendicular to the punching direction and having one end of the punch attached thereto;
A space between a surface of the die facing the punching direction and a surface of the punch plate opposite to the surface facing the punching direction is spaced apart, and the punch plate and the die are paired with a punching tool. A supporting means, and
The pair of punching tools are stacked in n pairs in the punching direction to form first to n-th punching tools from the punching start side, and the i-th (i = 1 to n) punching tools. When the other end of the punch attached to the punch plate possessed by punches the metal plate, the punch plate possessed by the (i + 1) pair of punching tools is pushed out, and the punching tool of the (i + 1) pair is punched. Pushing means to move in the direction,
A metal plate stamping apparatus characterized by comprising:   The metal plate punching apparatus according to claim 12, further comprising metal plate urging means that urges an outer edge portion of the metal plate installed in the separated space to the die. Plate punching machine.   The metal plate punching device is further attached to a punch plate of the i-th pair of punching tools on a surface facing the punching direction of the punch plate of the (i + 1) -th pair of punching tools. 14. The metal plate according to claim 12 or 13, further comprising unloading means for capturing a punched product punched at the other end of the punch and transporting the punched product from a space in which the punching tools are stacked. Punching device.   14. The metal plate punching apparatus further comprises compressed air blowing means for removing metal scrap punched by a punch attached to a punch plate included in the i-th pair of punching tools. The metal plate stamping processing apparatus described in 1.   16. The metal plate stamping apparatus further includes a sub guide rod that is inserted into a through hole provided in the die and has one end attached to the punch plate. The metal plate stamping processing apparatus described in 1.   The metal plate stamping apparatus according to any one of claims 12 to 16, wherein the support means includes an elastic body.   The extruding means is inserted into a through-hole provided in a die of the i-th pair of punching tools, and one end of the extruding means is fixed to a punch plate of the i-th pair of punching tools, The other end of the push-out means protrudes from the through hole when the metal plate installed in the spaced space of the pair of punching tools is punched. The metal plate punching apparatus according to the item.   The metal plate stamping apparatus according to any one of claims 12 to 18, wherein the die has a cutout portion into which an outer edge portion of the metal plate is fitted.   The metal plate punching apparatus according to any one of claims 12 to 19, wherein a die of the i-th pair of punching tools has a divergent surface along the punching direction.   21. The die according to any one of claims 12 to 20, wherein a thickness of the die of the i-th pair of punching tools is 20 times or more a plate thickness of the metal plate. Metal plate punching equipment.   The metal plate punching apparatus according to any one of claims 13 to 21, wherein the metal plate urging means includes an elastic body.

Images