WO2011077557A1 - Method for manufacturing magnetic steel sheet having nonmagnetic area, and punch/press apparatus - Google Patents

Method for manufacturing magnetic steel sheet having nonmagnetic area, and punch/press apparatus Download PDF

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Publication number
WO2011077557A1
WO2011077557A1 PCT/JP2009/071625 JP2009071625W WO2011077557A1 WO 2011077557 A1 WO2011077557 A1 WO 2011077557A1 JP 2009071625 W JP2009071625 W JP 2009071625W WO 2011077557 A1 WO2011077557 A1 WO 2011077557A1
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WO
WIPO (PCT)
Prior art keywords
steel sheet
plate
punching
electromagnetic steel
modified metal
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Application number
PCT/JP2009/071625
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French (fr)
Japanese (ja)
Inventor
拓也 清水
佳介 角田
Original Assignee
トヨタ自動車株式会社
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Application filed by トヨタ自動車株式会社 filed Critical トヨタ自動車株式会社
Priority to PCT/JP2009/071625 priority Critical patent/WO2011077557A1/en
Publication of WO2011077557A1 publication Critical patent/WO2011077557A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00Shaping by press-cutting; Perforating
    • B21D28/24Perforating, i.e. punching holes
    • B21D28/26Perforating, i.e. punching holes in sheets or flat parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/005Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
    • B21D35/007Layered blanks

Definitions

  • the present invention relates to a method of manufacturing an electrical steel sheet partially provided with nonmagnetic portions.
  • handling is improved from replacing a part of the electrical steel sheet with a non-magnetic alloy chip to melting by energization and integrating it as a non-magnetic part.
  • the present invention relates to a manufacturing method for reducing variation in the formation state of non-magnetic portions due to variation. It also relates to a punching and pressing device suitable for carrying out the manufacturing method.
  • a nonmagnetic portion is partially provided in a steel material used as an iron core of a rotating electrical machine or the like.
  • a part of a steel material is locally heated and then cooled to make the part a non-magnetic part.
  • the base material is basically a composition in which austenite becomes a stable phase, but a steel material having a ferromagnetic martensite structure by cold working is used. A part thereof is demagnetized by the above-described method.
  • a non-magnetic part is formed by inserting a non-magnetic material into a hole or recess in a magnetic steel sheet provided with a hole or recess, and melting and solidifying the non-magnetic material and the surrounding magnetic steel sheet with Joule heat by energization There is a way to do it.
  • This method is superior to the method of Patent Document 1 in that a substrate having a higher magnetic permeability can be used.
  • the non-magnetic material inserted into the hole or the recess is likely to fall off before being subjected to the melting and solidification treatment, so that it must be handled with care.
  • the present invention has been made in order to solve the problems of the conventional techniques described above.
  • the problem is that when the nonmagnetic material inserted into the hole in the electrical steel sheet is locally melted together with the surrounding electrical steel sheet to form a nonmagnetic part, the inserted nonmagnetic material is in the stage before melting.
  • An object of the present invention is to provide a method of manufacturing an electrical steel sheet having non-magnetic portions, which prevents falling off and prevents poor conduction due to thickness variations.
  • Another object of the present invention is to provide a punching and pressing apparatus suitable for carrying out the manufacturing method.
  • a modified metal chip is disposed in the hole of the magnetic steel sheet in which the hole is formed, and the chip is disposed.
  • the reformed metal chip and the surrounding electromagnetic steel sheet are energized and melted to form a non-magnetic portion.
  • an arrangement step of arranging the modified metal chip in the hole of the electromagnetic steel sheet, and a chip of the modified metal by pressing the modified metal chip and the surrounding electromagnetic steel sheet in the thickness direction after the arrangement process.
  • a pressing process that reduces the difference in thickness with the surrounding electrical steel sheet, and a magnetic steel sheet and a modified metal chip that have undergone the pressing process are sandwiched between two electrical steel sheets that have not undergone the placement process and the pressing process.
  • An electrical steel sheet having a non-magnetic portion is manufactured by superimposing the energized process of energizing the superposed modified metal chip and the surrounding electrical steel sheet.
  • the pressing process is performed after the arrangement process and before the energization process.
  • the modified metal tip and the surrounding electrical steel sheet are pressed in the thickness direction. This reduces the difference in thickness between the modified metal tip and the surrounding electrical steel sheet.
  • an energization path to the chip of the modified metal is ensured in the energization process that follows, regardless of variations in thickness due to manufacturing variations.
  • the chip of the modified metal can be melted satisfactorily in the energization process, and the nonmagnetic portion can be stably formed in a wider range.
  • the pressing process also has the effect of pressing the modified metal chip and the surrounding electrical steel sheet together in the in-plane direction.
  • the modified metal tip and the surrounding electrical steel sheet are constrained to each other.
  • tip of a modified metal does not drop from the hole of an electromagnetic steel plate at the time of the superimposition work with the other electromagnetic steel plate for an electricity supply process.
  • the pressing step it is possible to press only the edge of the modified metal chip and the surrounding electrical steel sheet, and not press the center of the modified metal chip. Such a press is sufficient to reduce the above-mentioned difference in sheet thickness and to prevent falling off. Further, the slight convex portion formed in the center portion of the modified metal chip that is not pressed is rather advantageous in securing the energization path to the center portion of the modified metal chip in the energization process.
  • the electrical steel sheet and the modified metal plate are overlapped, and the superimposed electrical steel sheet and the modified metal sheet are simultaneously punched in the thickness direction into the shape of the modified metal chip.
  • Both the magnetic steel sheet and the modified metal plate are formed with holes and chips, and the punched electromagnetic steel sheet and the modified metal chip are pushed back in the direction opposite to the punching direction. It is better to fit metal chips together. This is because the hole and the tip are all the same shape, so there is no hindrance to the fitting operation and no gap remains after fitting.
  • the above manufacturing method may be performed using a punching and pressing device having a punching portion and a press portion.
  • the punching portion includes an upper holding member and a lower holding member that sandwich and hold the plate-like object from above and below, and a part of the plate-like object held by the upper holding member and the lower holding member on its plate surface.
  • the punching member punched in the direction intersecting with the punching member and the punched piece punched by the punching member on the opposite side of the punching member with the plate-like object sandwiched therebetween are reversed in the direction of the punching operation of the punching member.
  • a push-back member that pushes back in the direction.
  • a press part has a lower member which mounts a plate-shaped target object, and a press member which presses the plate-shaped target object mounted on the lower member from the top. Furthermore, the holding surface of the lower holding member and the mounting surface of the lower member are connected to form the same surface.
  • the placement process is performed at the punching section, the object after the placement process is slid from the holding surface of the lower holding member onto the mounting surface of the lower member, and the pressing process is performed at the pressing section. It can be carried out. Since the holding surface of the lower holding member and the mounting surface of the lower member are connected to form the same surface, the modified metal tip does not fall out of the hole in the electromagnetic steel sheet during the slide.
  • the present invention when the nonmagnetic material inserted into the hole of the electrical steel sheet is locally melted together with the surrounding electrical steel sheets to form the nonmagnetic portion, the inserted nonmagnetic material is prevented from falling off before melting.
  • a method of manufacturing an electrical steel sheet having a non-magnetic portion that prevents the current-carrying failure due to variations in thickness is also provided.
  • FIG. 7 is an enlarged view of a part of FIG. 6.
  • FIG. 7 is an enlarged view of a part of FIG. 6.
  • the present embodiment embodies the present invention as a method for manufacturing a magnetic steel sheet for use as an iron core of a rotating electrical machine or the like, in which a nonmagnetic portion is locally provided in a portion that does not become a magnetic flux path. is there. Furthermore, the present embodiment includes equipment used for carrying out one process of the manufacturing method.
  • an electrical steel sheet having a nonmagnetic portion is manufactured by the following three steps. 1st process Punching and fitting process 2nd process Refit part press process 3rd process Nonmagnetic modification process
  • 1st process Punching and fitting process 2nd process Refit part press process 3rd process Nonmagnetic modification process
  • the punching and pressing apparatus 1 of this embodiment is configured as shown in FIG.
  • the punching and pressing apparatus 1 has a punching part 2 and a pressing part 3.
  • the punching portion 2 is a portion for performing the first step
  • the press portion 3 is a portion for performing the second step.
  • the punching part 2 has a holding part 4 and a punching die 5.
  • the holding unit 4 includes an upper holding member 41 and a lower holding member 42.
  • the upper holding member 41 is located above the object and can be moved up and down by a spring 43.
  • the lower holding member 42 is positioned below the object and is a fixed member.
  • the upper holding member 41 and the lower holding member 42 can fix the target electromagnetic steel sheet or the like by sandwiching it from above and below.
  • the punching die 5 has a punch 51 above the object and a die 52 below the object.
  • the punch 51 includes a core part 53 and a sleeve part 54.
  • the punch 51 is further provided with a cylinder 55 for raising and lowering.
  • the die 52 is fixed so that the height of the upper surface thereof matches the height of the upper surface of the lower holding member 42.
  • the die 52 may be integrated with the lower holding member 42.
  • the die 52 is formed with a hole having the same cross-sectional shape as that of the core portion 53, and a push-back member 56 is disposed there.
  • the pushing back member 56 is urged upward by a spring 57 so as not to protrude from the die 52.
  • both the upper holding member 41 and the punch 51 are in a raised state.
  • the pressing unit 3 has a lower member 6 and a pressing member 7.
  • the lower member 6 is fixed so that the height of the upper surface thereof coincides with the height of the upper surface of the lower holding member 42.
  • the press member 7 is provided so as to be movable up and down. An object is sandwiched between the lower member 6 and the press member 7 and pressed. The diameter of the press member 7 is larger than the diameter of the core portion 53. In the press part 3 in FIG. 1, the press member 7 is in a raised state.
  • An intermediate plate 11 is provided between the lower member 6 of the press part 3 and the lower holding member 42 of the punching part 2.
  • the upper surface of the lower holding member 42, the upper surface of the intermediate plate 11, and the upper surface of the lower member 6 form one surface that is smoothly connected to the extent that there is no hindrance to the slide movement described in [0026].
  • This step is a step of making a hole in the electromagnetic steel sheet and placing a nonmagnetic alloy chip in the hole.
  • This step is performed by the punching unit 2 in the punching and pressing apparatus 1 of FIG.
  • the electromagnetic steel plate 8 and the alloy plate 9 as the target members are placed on the lower holding member 42 and the die 52 of the punched portion 2 so as to overlap each other.
  • the electromagnetic steel plate 8 is below and the alloy plate 9 is positioned thereon.
  • the upper holding member 41 is lowered as shown in FIG.
  • the electromagnetic steel plate 8 and the alloy plate 9 are sandwiched and fixed from above and below by the upper holding member 41 and the lower holding member 42 of the holding portion 4.
  • the alloy plate 9 is a plate material of an alloy that becomes an alloy chip 91 (see FIG. 10) to be melted in a non-magnetic modification step (third step) described later. At that time, the composition is such that it melts and mixes with the surrounding electrical steel sheet to form a nonmagnetic portion 10 (see FIG. 11) after solidification.
  • the alloy plate 9 itself may be a magnetic material or a non-magnetic material, but it must have a composition that becomes a non-magnetic material after mixing with iron derived from an electromagnetic steel plate. That is, the alloy plate 9 can be said to be a modified metal plate having a function of modifying the iron of the electromagnetic steel sheet into a non-magnetic material.
  • nickel-chromium alloy is used.
  • the thickness of the electromagnetic steel plate 8 and the alloy plate 9 is the same as the nominal value.
  • the punch 51 is lowered by the cylinder 55 to obtain the state shown in FIG.
  • the punch 51 is further lowered, only the core portion 53 is lowered without lowering the sleeve portion 54, and both the electromagnetic steel plate 8 and the alloy plate 9 are punched out.
  • This state is shown in FIG.
  • the chips 83 and 91 which are punched pieces are received by the push-back member 56 and remain in place without falling. That is, in the state of FIG. 4, the chips 83 and 91 are held by being sandwiched between the core portion 53 and the pushback member 56.
  • the electromagnetic steel plate 8 and the alloy plate 9 have holes 82 and 92 opened at the punched portions.
  • the tips 83 and 91 and the holes 82 and 92 all have the same shape.
  • the punch 51 is pulled back slightly upward by operating the cylinder 55. Then, due to the urging of the spring 57, the pushing back member 56 is also moved upward. That is, the chips 83 and 91 are pushed back upward. The direction of pushing back is opposite to the direction of punching described above.
  • the state shown in FIG. 5 is obtained.
  • the alloy tip 91 punched from the alloy plate 9 is located at the same height as the electromagnetic steel plate 8. That is, the alloy chip 91 is fitted in the hole 82 of the electromagnetic steel plate 8. The fitting is performed smoothly, and there is almost no gap between the fitted alloy chip 91 and the hole 82 of the electromagnetic steel sheet 8. This is because they are the same shape as described above.
  • the holding part 4 may be loosened and the electromagnetic steel plate 8 and the alloy chip 91 may be slid out of the punched part 2.
  • the thickness of the electromagnetic steel plate 8 and the alloy chip 91 is substantially equal, it can be smoothly slid.
  • the electromagnetic steel sheet 8 in which the punched hole 82 is replaced with the alloy chip 91 is obtained.
  • the alloy chip 91 is not yet restrained with respect to the electromagnetic steel sheet 8.
  • the alloy plate 9 and the electromagnetic steel plate chip 83 are left in place.
  • the electromagnetic steel plate chip 83 is then discarded.
  • the alloy plate 9 is reused while avoiding the position where the hole 92 is opened.
  • the electromagnetic steel plate 8 and the alloy chip 91 are set so that the entire alloy chip 91 is positioned within the range pressed by the press member 7. In the state set in this way, as shown in FIG. As a result, the entire alloy chip 91 and the portion around the alloy chip 91 in the electromagnetic steel sheet 8 are pressed by the press member 7.
  • the first purpose is to eliminate the step between the electromagnetic steel sheet 8 and the alloy chip 91 due to individual differences in sheet thickness.
  • the second purpose is to prevent the alloy chip 91 from being easily detached from the electromagnetic steel sheet 8.
  • the first purpose will be described. Although it has been described before that the electromagnetic steel plate 8 and the alloy plate 9 have the same nominal thickness, there are actually some individual differences in mass-produced products. There is a possibility that the electromagnetic steel plate 8 and the alloy plate 9 have different thicknesses within the range of variations due to individual differences. Due to this difference in thickness, if there is a step at the boundary between the electromagnetic steel sheet 8 and the alloy chip 91, the subsequent nonmagnetic modification step (third step) may be hindered. Details of the trouble will be described later in the non-magnetic modification step. The elimination or alleviation of this step is the first purpose of performing the second step.
  • the surface 8F of the electromagnetic steel plate 8 and the surface 91F of the alloy chip 91 are flat surfaces having almost no steps. None, the back surface 8R of the electromagnetic steel sheet 8 and the back surface 91R of the alloy chip 91 are flat surfaces with almost no step. Therefore, the load G of the press here may be relatively light enough to eliminate the step based on the individual difference in the plate thickness. It is not necessary to apply such a heavy load as to make a clear dent on the electromagnetic steel sheet 8 or the like.
  • the second purpose is to slightly spread the alloy chip 91 outward in the in-plane direction, and conversely, the portion around the alloy chip 91 of the electromagnetic steel sheet 8 is directed inward toward the alloy chip 91 in the in-plane direction. It is to spread. That is, as shown in the enlarged view of FIG. 8 (showing the same range as FIG. 7), the press load G is applied to both the alloy tip 91 and the electromagnetic steel plate 8. For this reason, the alloy chip 91 is slightly pushed outward by the load G1 applied to the alloy chip 91 (P). Further, the portion around the alloy chip 91 of the electromagnetic steel sheet 8 is slightly expanded inward by the load G2 applied to the electromagnetic steel sheet 8 (Q).
  • the alloy chip 91 and the electromagnetic steel plate 8 are pressed against each other in the in-plane direction, so that the alloy chip 91 is restrained by the electromagnetic steel plate 8. This prevents the alloy chip 91 from being detached from the electromagnetic steel sheet 8 before performing the third step.
  • Such a state is satisfactorily achieved with a relatively light press load as described in the first object.
  • the electromagnetic steel sheet that has undergone the second step is referred to as a refit electromagnetic steel sheet.
  • This step is a step of superimposing and integrating the refit electromagnetic steel plate obtained in the second step together with other electromagnetic steel plates, and reforming the alloy chip 91 and its surrounding locations to nonmagnetic locations.
  • the refit electromagnetic steel sheet 80 is superposed together with the other two electromagnetic steel sheets 81.
  • the fitting electromagnetic steel sheet 80 is positioned in the middle. As described above, there is a portion that is the alloy chip 91 in the magnetic steel sheet 80 to be fitted. None of the other two electromagnetic steel sheets 81 have such a portion.
  • the other electromagnetic steel plate 81 may be the same as the electromagnetic steel plate 8 before being subjected to the first step described above.
  • the laminated body of the three electromagnetic steel plates stacked is sandwiched between the electrode pairs 12 and 12 as shown in FIG.
  • the place to be sandwiched is the place with the alloy chip 91 in the magnetic steel sheet 80 to be fitted.
  • a current is applied while pressurizing the portion with the electrode pairs 12 and 12 in a manner similar to spot welding.
  • the alloy chip 91 is melted by the Joule heat of this current, and the melt is re-solidified after the end of energization, thereby forming a nonmagnetic portion 10 as shown in FIG.
  • the electromagnetic steel plates 81 and 81 are not so large as to have holes.
  • the completed nonmagnetic portion 10 is larger in both thickness and diameter than the size of the alloy tip 91 before energization.
  • the elemental composition of the nonmagnetic portion 10 is a composition in which the iron component derived from the electromagnetic steel sheet melted together with the component elements of the original alloy chip 91 is mixed. This composition is an austenite-type nonmagnetic structure.
  • the thickness of the nonmagnetic portion 10 is thicker than the thickness of the middle electromagnetic steel sheet 80. That is, the nonmagnetic portion 10 is formed by partially biting into the upper and lower electromagnetic steel plates 80 and 80. For this reason, the thickness of the electromagnetic steel plate 80 is thinner than the thickness of the electromagnetic steel plate 80 in other locations at the location where the nonmagnetic location 10 exists. Specifically, the thickness is less than half. Therefore, in the place with the nonmagnetic part 10, the nonmagnetic part 10 occupies the thickness more than two electromagnetic steel sheets among the thickness for three electromagnetic steel sheets. The thickness of the magnetic material remaining as the electromagnetic steel sheet 80 is less than the thickness of one original electromagnetic steel sheet even if both the front and back surfaces are combined. For this reason, most of the non-magnetic portion 10 in the modified electrical steel sheet is occupied by the non-magnetic material, and can be evaluated as being substantially non-magnetic.
  • the non-magnetic portion 10 is formed in a favorable size because the magnetic steel sheet 80 to be fitted has undergone a pressing process (second process). If a refit electromagnetic steel sheet that has not undergone a pressing process is used, the formation of the nonmagnetic portion 10 may be insufficient. The reason is due to the individual differences in thickness as described in [0029]. In particular, if there is a difference in plate thickness between the refitable electromagnetic steel sheet 80 and the alloy chip 91 therein, the current during energization may not sufficiently pass through the alloy chip 91. In such a case, the formation of the nonmagnetic portion 10 becomes insufficient.
  • the alloy chip 91 and the upper electromagnetic steel plate 81 are hardly in contact with each other. For this reason, almost no current flows through the alloy tip 91 during energization. As shown by an arrow E in FIG. 12, the current flows in the structure of the electromagnetic steel sheet around the alloy chip 91 while avoiding the gap 13. For this reason, the center part of the alloy tip 91 is hardly melted, and only the edge part is slightly melted. As a result, only the nonmagnetic portion 10 having a shape as shown in FIG. 13 is formed. The nonmagnetic portion 10 in FIG. 13 has only the thickness of the original alloy chip 91 at the center.
  • the entire circumference is 1 mm or more in the radial direction.
  • the diameter of the press member 7 is desirably 2 mm or more larger than the diameter of the core portion 53.
  • the adverse effect due to the presence of the difference in sheet thickness is not so great.
  • the shoulder portion of the alloy tip 91 is surely in contact with the upper electromagnetic steel plate 81.
  • tip 91 also contacts the upper electromagnetic steel plate 81 by the press of the electrode pairs 12 and 12.
  • the plate thickness difference is excessive, there is a problem that voids remain after energization or that the central portion of the alloy tip 91 does not contact the upper electromagnetic steel plate 81 even when the electrode pairs 12 and 12 are pressed. possible.
  • the difference in thickness is not reached within the range of normal thickness variations.
  • the modification test was performed by making and comparing two types of examples and comparative examples.
  • basically up to the second step was performed under the same conditions as described above, and the third step was further performed.
  • each plate material was selected and used so that the electromagnetic steel plate 8 was 20 ⁇ m thicker than the alloy plate 9 when the first step was performed.
  • the comparative example it was made to be the same as that of an Example except the point used for the 3rd process without passing through the 2nd process after the 1st process.
  • the third step here was performed under the following conditions. Diameter (diameter) of the contact surface of the electrode to the energized object 8mm 1000mm radius of curvature of contact surface of electrode to energized object Electrode pressure load 2kN Current value 8kA Energizing time 0.15 seconds
  • the thickness at the center of the nonmagnetic portion 10 formed after the third step was measured by cross-sectional microscope observation.
  • the ratio of the thickness to the total thickness of the three electromagnetic steel sheets stacked in the first step was defined as the reforming rate (%).
  • the distribution of the reforming rate for each of the examples and comparative examples is shown in the graph of FIG.
  • the distribution range of the reforming rate in the examples was 65 to 80%.
  • the distribution range of the reforming rate in the comparative example was 45 to 80%, and about half of the reforming rates were less than 65%. From a comparison between this example and the comparative example, it can be seen that the reforming rate of 65% or more is secured in the example, and a stable quality with little variation is obtained.
  • the press part 3 in the punching and pressing apparatus 1 can be modified as described below. That is, instead of the columnar press member 7 shown in FIG. 6, a cylindrical press member 71 is used as shown in FIG.
  • the cylindrical press member 71 must have an outer diameter (diameter) larger than the diameter of the core portion 53 of the punched portion 2 and an inner diameter smaller than the diameter of the core portion 53.
  • the range to be pressed in the pressing step (second step) is the edge portion of the alloy tip 91 and the portion around the alloy tip 91 in the electromagnetic steel plate 8. That is, the entire alloy chip 91 is not pressed, but only the edge portion is pressed. The central part of the alloy tip 91 is not pressed. Thus, even if only the portion adjacent to the boundary between the alloy chip 91 and the electromagnetic steel sheet 8 is pressed, both the first and second objects described in [0028] to [0032] are sufficiently achieved. Is done. Therefore, even when the cylindrical press member 71 is used, the same effect as that obtained when the cylindrical press member 7 is used can be obtained.
  • the diameter of the core part 53 is desirably 2 mm or more larger than the inner diameter (diameter) of the press member 71.
  • the center portion of the alloy chip 91 that is not pressed becomes slightly thicker than the edge portion of the alloy chip 91 that is pressed.
  • this is rather advantageous in terms of securing a current path in the central portion of the alloy tip 91.
  • the member located below the electromagnetic steel plate 8 or the like in the press portion 3, that is, the lower member 6 may be cylindrical like the press member 71.
  • only the lower member 6 may be cylindrical and used in combination with the columnar press member 7.
  • the punching and pressing apparatus 1 having the punching portion 2 and the press portion 3 is used.
  • the punching portion 2 is provided with a pushing-back member 56 that receives and returns the punched piece punched by the core portion 53 of the punch 51.
  • the electromagnetic steel plate 8 and the alloy plate 9 are overlapped and punched at the same time, and the alloy chip 91 which is a punched piece of the alloy plate 9 is pushed back by the push-back member 56 until the same height as the electromagnetic steel plate 8 is reached.
  • an intermediate plate 11 is provided between the punching part 2 and the pressing part 3.
  • the upper surface of the lower holding member 42 of the punched portion 2 (and the upper surface of the die 52) and the upper surface of the lower member 6 of the press portion 3 are connected to form the same surface.
  • the electromagnetic steel plate 8 and the alloy tip 91 that have been fitted in the punched portion 2 can be slid to the press portion 3 without the alloy tip 91 falling off.
  • the electromagnetic steel plate 8 and the alloy chip 91 which have been slid from the punching part 2 are pressed by the press member 7 or the press member 71 across both the electromagnetic steel sheet 8 and the alloy chip 91.
  • the plate thickness difference caused by the manufacturing variation between the electromagnetic steel plate 8 and the alloy chip 91 is substantially eliminated.
  • the electromagnetic steel plate 8 and the alloy chip 91 are restrained from each other so that they are not easily detached. As a result, it is possible to obtain a refitable electrical steel sheet that prevents the alloy chips 91 from falling off during stacking and that is favorably modified by energization.
  • the alloy chip 91 is melted satisfactorily so that the nonmagnetic portion 10 is formed.
  • a method of manufacturing an electrical steel sheet having non-magnetic portions that is easy to manufacture and has little variation in quality has been realized.
  • a punching and pressing device suitable for the use has been realized.
  • the punched portion 2 is configured to punch the target plate material from the top to the bottom and push the punched piece back from the bottom to the top.
  • the present invention is not limited to this, and it is also possible to configure such that the plate material is punched from the bottom to the top and the punched piece is pushed back from the top to the bottom.
  • the intermediate plate 11 between the punched portion 2 and the press portion 3 may be integrated with a member on the punched portion 2 side or a member on the press portion 3 side, or from the punched portion 2 side to the press portion 3 side. It may be integrated as a whole.
  • the thickness may be different between the ordinary electrical steel sheets at both ends and the middle-fit electromagnetic steel sheet.
  • two or more fitted electromagnetic steel sheets may be sandwiched between two ordinary electromagnetic steel sheets at the same time.

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Abstract

Disclosed is a punch/press apparatus (1) having a punching section (2) and a pressing section (3). The punching section (2) has: a holding section (4) which holds a board-like subject; a punching core section (53) which punches out a part of the subject being held; and a press back member (56), which is positioned on the side opposite to the core section (53) with respect to the subject, and which presses back the punched-out piece. The pressing section (3) has a lower member (6) and a pressing member (7). The lower holding member (42) of the holding section (4) and the lower member (6) are connected on the same plane. A magnetic steel sheet and a plate material composed of a modified metal are set on the punching section by placing one over the other, and are punched out at the same time, then, the punched out chips of both the plate materials are pressed back in the reverse direction of the punching direction, thereby fitting the modified metal chip in the magnetic steel sheet. Then, both the plate materials are slid to the pressing section (3) and pressed, thereby modifying the plate thickness difference due to variance in manufacture of both the plate materials. Then, a nonmagnetic area is formed by carrying a current.

Description

非磁性箇所を有する電磁鋼板の製造方法,および,打ち抜きおよびプレス装置Method for manufacturing electrical steel sheet having non-magnetic portion, and punching and pressing apparatus
 本発明は,部分的に非磁性箇所が設けられた電磁鋼板を製造する方法に関する。さらに詳細には,電磁鋼板の一部を非磁性合金のチップで置き換えてから通電により溶融させて非磁性箇所として一体化させるまでの間における取り扱い性の向上,および,電磁鋼板等の板厚のばらつきに起因する非磁性箇所の形成状況のばらつきの軽減を図った製造方法に関するものである。また,その製造方法の実施に適した打ち抜きおよびプレス装置にも関する。 The present invention relates to a method of manufacturing an electrical steel sheet partially provided with nonmagnetic portions. In more detail, handling is improved from replacing a part of the electrical steel sheet with a non-magnetic alloy chip to melting by energization and integrating it as a non-magnetic part. The present invention relates to a manufacturing method for reducing variation in the formation state of non-magnetic portions due to variation. It also relates to a punching and pressing device suitable for carrying out the manufacturing method.
 従来から,回転電機等の鉄心として用いられる鋼材に,部分的に非磁性箇所を設けることが行われている。例えば特許文献1の技術では,鋼材の一部分を局所的に加熱しその後冷却することで,その箇所を非磁性箇所としている。すなわち,基材として,基本的にはオーステナイトが安定相となる組成であるが,冷間加工により強磁性のマルテンサイト組織とした鋼材を用いる。その一部分を上記の手法により非磁性化するのである。 Conventionally, a nonmagnetic portion is partially provided in a steel material used as an iron core of a rotating electrical machine or the like. For example, in the technique of Patent Document 1, a part of a steel material is locally heated and then cooled to make the part a non-magnetic part. In other words, the base material is basically a composition in which austenite becomes a stable phase, but a steel material having a ferromagnetic martensite structure by cold working is used. A part thereof is demagnetized by the above-described method.
特開2001-251822号公報JP 2001-251822 A
 鋼材の一部を非磁性箇所とする方法は上記のものの他にもある。例えば,穴または凹部を設けた電磁鋼板の穴または凹部に非磁性材を挿入し,その非磁性材およびその周囲の電磁鋼板を通電によるジュール熱で溶融させそして凝固させることで非磁性箇所を形成する方法がある。この手法によれば,基材としてより高透磁率のものを用いることができる点で特許文献1の手法より優れている。しかしながら,穴または凹部に挿入した非磁性体は,溶融および凝固の処理に供される前の時点では脱落しやすいため,取り扱いに注意する必要がある。また,電磁鋼板の厚みや,挿入した非磁性体の厚みにはある程度のばらつきがある。このため,通電のための電極との接触が不十分となる個体もあり得る。そのような個体では非磁性箇所の形成状況が不十分なケースがある。 There are other methods for making a part of the steel material non-magnetic as well. For example, a non-magnetic part is formed by inserting a non-magnetic material into a hole or recess in a magnetic steel sheet provided with a hole or recess, and melting and solidifying the non-magnetic material and the surrounding magnetic steel sheet with Joule heat by energization There is a way to do it. This method is superior to the method of Patent Document 1 in that a substrate having a higher magnetic permeability can be used. However, the non-magnetic material inserted into the hole or the recess is likely to fall off before being subjected to the melting and solidification treatment, so that it must be handled with care. In addition, there is some variation in the thickness of the electromagnetic steel sheet and the thickness of the inserted non-magnetic material. For this reason, there may be an individual in which contact with the electrode for energization is insufficient. In such individuals, there are cases where the formation of non-magnetic portions is insufficient.
 本発明は,前記した従来の技術が有する問題点を解決するためになされたものである。すなわちその課題とするところは,電磁鋼板の穴に挿入した非磁性材をその周囲の電磁鋼板とともに局所的に溶融させて非磁性箇所を形成するに際し,挿入した非磁性体の溶融前の段階における脱落を防止し,また,厚みのばらつきによる通電不良を防止した,非磁性箇所を有する電磁鋼板の製造方法を提供することにある。また,その製造方法の実施に適した打ち抜きおよびプレス装置を提供することをも課題とする。 The present invention has been made in order to solve the problems of the conventional techniques described above. In other words, the problem is that when the nonmagnetic material inserted into the hole in the electrical steel sheet is locally melted together with the surrounding electrical steel sheet to form a nonmagnetic part, the inserted nonmagnetic material is in the stage before melting. An object of the present invention is to provide a method of manufacturing an electrical steel sheet having non-magnetic portions, which prevents falling off and prevents poor conduction due to thickness variations. Another object of the present invention is to provide a punching and pressing apparatus suitable for carrying out the manufacturing method.
 この課題の解決を目的としてなされた本発明の一態様における非磁性箇所を有する電磁鋼板の製造方法では,穴が形成された電磁鋼板の穴に改質金属のチップを配置して,その配置した状態で改質金属のチップおよびその周囲の電磁鋼板に通電して溶融させて非磁性箇所を形成する。ここにおいて,電磁鋼板の穴に改質金属のチップを配置する配置工程と,配置工程後に改質金属のチップおよびその周囲の電磁鋼板を厚さ方向にプレスすることにより,改質金属のチップとその周囲の電磁鋼板との厚さの差を減少させるプレス工程と,プレス工程を経た電磁鋼板および改質金属のチップを,配置工程およびプレス工程を経ていない2枚の電磁鋼板の間に挟み込んで重ね合わせ,その重ね合わせられた状態の改質金属のチップおよびその周囲の電磁鋼板に通電する通電工程とにより,非磁性箇所を有する電磁鋼板を製造する。 In the method for manufacturing a magnetic steel sheet having a nonmagnetic portion according to one aspect of the present invention, which is made for the purpose of solving this problem, a modified metal chip is disposed in the hole of the magnetic steel sheet in which the hole is formed, and the chip is disposed. In this state, the reformed metal chip and the surrounding electromagnetic steel sheet are energized and melted to form a non-magnetic portion. Here, an arrangement step of arranging the modified metal chip in the hole of the electromagnetic steel sheet, and a chip of the modified metal by pressing the modified metal chip and the surrounding electromagnetic steel sheet in the thickness direction after the arrangement process. A pressing process that reduces the difference in thickness with the surrounding electrical steel sheet, and a magnetic steel sheet and a modified metal chip that have undergone the pressing process are sandwiched between two electrical steel sheets that have not undergone the placement process and the pressing process. An electrical steel sheet having a non-magnetic portion is manufactured by superimposing the energized process of energizing the superposed modified metal chip and the surrounding electrical steel sheet.
 上記製造方法では,配置工程後通電工程前に,プレス工程を行う。このプレス工程では,改質金属のチップおよびその周囲の電磁鋼板を厚さ方向にプレスする。これにより,改質金属のチップとその周囲の電磁鋼板との厚さの差が減少する。これにより,製造ばらつきに起因する板厚のばらつきに関わらず,続く通電工程での改質金属のチップへの通電経路が確保される。この結果,通電工程で改質金属のチップを良好に溶融させ,安定的により広い範囲に非磁性箇所を形成することができる。また,プレス工程には,改質金属のチップおよびその周囲の電磁鋼板を面内方向で互いに押し付け合わせる作用もある。これにより,改質金属のチップとその周囲の電磁鋼板とが互いに拘束し合う状態となる。このため,通電工程のための他の電磁鋼板との重ね合わせ作業時などに,電磁鋼板の穴から改質金属のチップが脱落してしまうことがない。 In the above manufacturing method, the pressing process is performed after the arrangement process and before the energization process. In this pressing step, the modified metal tip and the surrounding electrical steel sheet are pressed in the thickness direction. This reduces the difference in thickness between the modified metal tip and the surrounding electrical steel sheet. As a result, an energization path to the chip of the modified metal is ensured in the energization process that follows, regardless of variations in thickness due to manufacturing variations. As a result, the chip of the modified metal can be melted satisfactorily in the energization process, and the nonmagnetic portion can be stably formed in a wider range. The pressing process also has the effect of pressing the modified metal chip and the surrounding electrical steel sheet together in the in-plane direction. As a result, the modified metal tip and the surrounding electrical steel sheet are constrained to each other. For this reason, the chip | tip of a modified metal does not drop from the hole of an electromagnetic steel plate at the time of the superimposition work with the other electromagnetic steel plate for an electricity supply process.
 ここでプレス工程では,改質金属のチップの縁辺部およびその周囲の電磁鋼板のみをプレスし,改質金属のチップの中央部をプレスしないこととすることができる。前述の板厚差の緩和も,脱落防止も,このようなプレスで十分である。さらに,プレスされない改質金属のチップの中央部にできるわずかな凸部は,通電工程での改質金属のチップの中央部への通電経路の確保上,むしろ有利である。 Here, in the pressing step, it is possible to press only the edge of the modified metal chip and the surrounding electrical steel sheet, and not press the center of the modified metal chip. Such a press is sufficient to reduce the above-mentioned difference in sheet thickness and to prevent falling off. Further, the slight convex portion formed in the center portion of the modified metal chip that is not pressed is rather advantageous in securing the energization path to the center portion of the modified metal chip in the energization process.
 一方,配置工程については,電磁鋼板と改質金属の板材とを重ね合わせて,重ね合わせた電磁鋼板と改質金属の板材とを,改質金属のチップの形状に厚さ方向に同時に打ち抜いて,電磁鋼板および改質金属の板材にともに,穴とチップとを形成し,打ち抜かれた電磁鋼板および改質金属のチップを打ち抜きの向きと逆向きに押し戻すことで,電磁鋼板の穴に改質金属のチップを嵌め合わせることとするとよい。穴とチップがすべて同じ形なので,嵌め合わせ操作に支障がなく,嵌め合わせ後に隙間が残ることもないからである。 On the other hand, regarding the placement process, the electrical steel sheet and the modified metal plate are overlapped, and the superimposed electrical steel sheet and the modified metal sheet are simultaneously punched in the thickness direction into the shape of the modified metal chip. Both the magnetic steel sheet and the modified metal plate are formed with holes and chips, and the punched electromagnetic steel sheet and the modified metal chip are pushed back in the direction opposite to the punching direction. It is better to fit metal chips together. This is because the hole and the tip are all the same shape, so there is no hindrance to the fitting operation and no gap remains after fitting.
 上記製造方法は,打ち抜き部とプレス部とを有する打ち抜きおよびプレス装置を用いて行うとよい。ここで打ち抜き部は,板状対象物を上下から挟み付けて保持する上保持部材および下保持部材と,上保持部材および下保持部材に保持されている板状対象物の一部をその板面と交差する方向に打ち抜く打ち抜き部材と,板状対象物を挟んで打ち抜き部材の反対側に位置し,板状対象物から打ち抜き部材により打ち抜かれた打ち抜き片を,打ち抜き部材の打ち抜き動作の向きと逆向きに押し返す押し返し部材とを有するものである。また,プレス部は,板状対象物を載置する下部材と,下部材に載置されている板状対象物を上からプレスするプレス部材とを有するものである。さらに,下保持部材の保持面と下部材の載置面とは,同一面をなして繋がっている。 The above manufacturing method may be performed using a punching and pressing device having a punching portion and a press portion. Here, the punching portion includes an upper holding member and a lower holding member that sandwich and hold the plate-like object from above and below, and a part of the plate-like object held by the upper holding member and the lower holding member on its plate surface. The punching member punched in the direction intersecting with the punching member and the punched piece punched by the punching member on the opposite side of the punching member with the plate-like object sandwiched therebetween are reversed in the direction of the punching operation of the punching member. And a push-back member that pushes back in the direction. Moreover, a press part has a lower member which mounts a plate-shaped target object, and a press member which presses the plate-shaped target object mounted on the lower member from the top. Furthermore, the holding surface of the lower holding member and the mounting surface of the lower member are connected to form the same surface.
 かかる打ち抜きおよびプレス装置を用いると,配置工程を打ち抜き部で行い,配置工程後の対象物を,下保持部材の保持面上から下部材の載置面上へスライドさせ,プレス工程をプレス部で行うことができる。下保持部材の保持面と下部材の載置面とが同一面をなして繋がっているので,スライドの途中で電磁鋼板の穴から改質金属のチップが脱落してしまうことがない。 When such a punching and pressing apparatus is used, the placement process is performed at the punching section, the object after the placement process is slid from the holding surface of the lower holding member onto the mounting surface of the lower member, and the pressing process is performed at the pressing section. It can be carried out. Since the holding surface of the lower holding member and the mounting surface of the lower member are connected to form the same surface, the modified metal tip does not fall out of the hole in the electromagnetic steel sheet during the slide.
 本発明によれば,電磁鋼板の穴に挿入した非磁性材をその周囲の電磁鋼板とともに局所的に溶融させて非磁性箇所を形成するに際し,挿入した非磁性体の溶融前の段階における脱落を防止し,また,厚みのばらつきによる通電不良を防止した,非磁性箇所を有する電磁鋼板の製造方法が提供されている。また,その製造方法の実施に適した打ち抜きおよびプレス装置も提供されている。 According to the present invention, when the nonmagnetic material inserted into the hole of the electrical steel sheet is locally melted together with the surrounding electrical steel sheets to form the nonmagnetic portion, the inserted nonmagnetic material is prevented from falling off before melting. There is provided a method of manufacturing an electrical steel sheet having a non-magnetic portion that prevents the current-carrying failure due to variations in thickness. A punching and pressing apparatus suitable for carrying out the manufacturing method is also provided.
実施の形態に係る打ち抜きおよびプレス装置の構成図である。It is a block diagram of the punching and press apparatus which concerns on embodiment. 打ち抜きおよびプレス装置の打ち抜き部に電磁鋼板および合金板をセットした状態を示す断面図である。It is sectional drawing which shows the state which set the electromagnetic steel plate and the alloy plate in the punching part of the punching and press apparatus. パンチを下降させた状態を示す断面図である。It is sectional drawing which shows the state which lowered | hung the punch. 電磁鋼板および合金板を打ち抜いた状態を示す断面図である。It is sectional drawing which shows the state which stamped the electromagnetic steel plate and the alloy plate. 合金チップを押し戻して電磁鋼板に嵌め込んだ状態を示す断面図である。It is sectional drawing which shows the state which pushed back the alloy chip | tip and was fitted in the electromagnetic steel plate. 打ち抜きおよびプレス装置のプレス部で電磁鋼板と合金チップとをプレスする状況を示す断面図である。It is sectional drawing which shows the condition which presses an electromagnetic steel plate and an alloy chip | tip by the press part of a punching and a press apparatus. 図6の一部分の拡大図である。FIG. 7 is an enlarged view of a part of FIG. 6. 図6の一部分の拡大図である。FIG. 7 is an enlarged view of a part of FIG. 6. 嵌め換え電磁鋼板と他の電磁鋼板との重ね合わせを説明する断面図である。It is sectional drawing explaining superimposition with a fitting electromagnetic steel plate and another electromagnetic steel plate. 重ね合わせた電磁鋼板を通電のために電極対で挟み付けた状態を示す断面図である。It is sectional drawing which shows the state which pinched | superposed the electromagnetic steel plate with the electrode pair for electricity supply. 通電により改質して非磁性箇所を形成した状態を示す断面図である。It is sectional drawing which shows the state which reformed by electricity supply and formed the nonmagnetic location. 合金チップが電磁鋼板より薄かった場合の現象を説明する断面図である。It is sectional drawing explaining the phenomenon when an alloy chip is thinner than an electromagnetic steel plate. 図12の場合に形成される非磁性領域の状況を示す断面図である。It is sectional drawing which shows the condition of the nonmagnetic area | region formed in the case of FIG. 実施例および比較例における改質率の分布を示すグラフである。It is a graph which shows distribution of the modification rate in an example and a comparative example. 変形例に係るプレス部を示す断面図である。It is sectional drawing which shows the press part which concerns on a modification.
 以下,本発明を具体化した実施の形態について,添付図面を参照しつつ詳細に説明する。本形態は,回転電機等の鉄心として用いるための電磁鋼板であって,磁束経路とならない部分に局所的に非磁性箇所を設けたものを製造するための方法として本発明を具体化したものである。さらに本形態には,その製造方法の一過程の実施に用いる機器をも含む。 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present embodiment embodies the present invention as a method for manufacturing a magnetic steel sheet for use as an iron core of a rotating electrical machine or the like, in which a nonmagnetic portion is locally provided in a portion that does not become a magnetic flux path. is there. Furthermore, the present embodiment includes equipment used for carrying out one process of the manufacturing method.
 本形態では基本的に,次の3工程により,非磁性箇所を有する電磁鋼板を製造する。
      第1の工程 打ち抜きおよび嵌め換え工程
      第2の工程 嵌め換え部プレス工程
      第3の工程 非磁性改質工程
 以下,順次説明する。
In this embodiment, basically, an electrical steel sheet having a nonmagnetic portion is manufactured by the following three steps.
1st process Punching and fitting process 2nd process Refit part press process 3rd process Nonmagnetic modification process Hereinafter, it demonstrates sequentially.
[打ち抜きおよびプレス装置]
 最初に,第1の工程および第2の工程を実施するための打ち抜きおよびプレス装置について説明する。本形態の打ち抜きおよびプレス装置1は,図1に示すように構成されている。打ち抜きおよびプレス装置1は,打ち抜き部2と,プレス部3とを有している。打ち抜き部2は第1の工程を実施するための部分であり,プレス部3は第2の工程を実施するための部分である。
[Punching and pressing equipment]
First, a punching and pressing apparatus for performing the first step and the second step will be described. The punching and pressing apparatus 1 of this embodiment is configured as shown in FIG. The punching and pressing apparatus 1 has a punching part 2 and a pressing part 3. The punching portion 2 is a portion for performing the first step, and the press portion 3 is a portion for performing the second step.
 打ち抜き部2は,保持部4と,打ち抜き型5とを有している。保持部4は,上保持部材41および下保持部材42を有している。上保持部材41は,対象物より上側に位置するものであり,バネ43により昇降可能となっている。下保持部材42は,対象物より下側に位置するものであり,固定された部材である。上保持部材41と下保持部材42とで,対象とする電磁鋼板等を上下から挟み付けて固定できるようになっている。 The punching part 2 has a holding part 4 and a punching die 5. The holding unit 4 includes an upper holding member 41 and a lower holding member 42. The upper holding member 41 is located above the object and can be moved up and down by a spring 43. The lower holding member 42 is positioned below the object and is a fixed member. The upper holding member 41 and the lower holding member 42 can fix the target electromagnetic steel sheet or the like by sandwiching it from above and below.
 打ち抜き型5は,対象物より上側のパンチ51と,対象物より下側のダイ52とを有している。パンチ51は,芯部53とスリーブ部54とにより構成されている。パンチ51にはさらに,昇降のためのシリンダ55が設けられている。ダイ52は,その上面の高さが下保持部材42の上面の高さと一致するように固定されている。なお,ダイ52は下保持部材42と一体であってもよい。ダイ52には,芯部53と同じ断面形状の穴が形成されており,そこに押し返し部材56が配置されている。押し返し部材56は,バネ57により,ダイ52から突出しない程度に上向きに付勢されている。図1中の打ち抜き部2では,上保持部材41およびパンチ51がいずれも上昇している状態となっている。 The punching die 5 has a punch 51 above the object and a die 52 below the object. The punch 51 includes a core part 53 and a sleeve part 54. The punch 51 is further provided with a cylinder 55 for raising and lowering. The die 52 is fixed so that the height of the upper surface thereof matches the height of the upper surface of the lower holding member 42. The die 52 may be integrated with the lower holding member 42. The die 52 is formed with a hole having the same cross-sectional shape as that of the core portion 53, and a push-back member 56 is disposed there. The pushing back member 56 is urged upward by a spring 57 so as not to protrude from the die 52. In the punching part 2 in FIG. 1, both the upper holding member 41 and the punch 51 are in a raised state.
 プレス部3は,下部材6とプレス部材7とを有している。下部材6は,その上面の高さが下保持部材42の上面の高さと一致するように固定されている。プレス部材7は,昇降可能に設けられている。下部材6とプレス部材7とで,対象物を挟み付けてプレス加工するようになっている。プレス部材7の直径は,芯部53の直径より大きい。図1中のプレス部3では,プレス部材7が上昇している状態となっている。また,プレス部3の下部材6と打ち抜き部2の下保持部材42との間には中間板11が設けられている。下保持部材42の上面と中間板11の上面と下部材6の上面とは,[0026]で述べるスライド移動に支障がない程度に滑らかに繋がった一面をなしている。 The pressing unit 3 has a lower member 6 and a pressing member 7. The lower member 6 is fixed so that the height of the upper surface thereof coincides with the height of the upper surface of the lower holding member 42. The press member 7 is provided so as to be movable up and down. An object is sandwiched between the lower member 6 and the press member 7 and pressed. The diameter of the press member 7 is larger than the diameter of the core portion 53. In the press part 3 in FIG. 1, the press member 7 is in a raised state. An intermediate plate 11 is provided between the lower member 6 of the press part 3 and the lower holding member 42 of the punching part 2. The upper surface of the lower holding member 42, the upper surface of the intermediate plate 11, and the upper surface of the lower member 6 form one surface that is smoothly connected to the extent that there is no hindrance to the slide movement described in [0026].
[第1の工程]
 次に,第1の工程である打ち抜きおよび嵌め換え工程について説明する。この工程は,電磁鋼板に穴を開けてその穴に非磁性合金のチップを配置する工程である。この工程は,図1の打ち抜きおよびプレス装置1における打ち抜き部2で実施される。この工程ではまず,打ち抜き部2の下保持部材42およびダイ52上に,対象部材である電磁鋼板8と合金板9とを,重ね合わせて載置する。電磁鋼板8が下で,その上に合金板9が位置するようにする。この状態で図2に示すように,上保持部材41を下降させる。これにより電磁鋼板8と合金板9とを,保持部4の上保持部材41と下保持部材42とで上下から挟み付けて固定する。
[First step]
Next, the punching and fitting process that is the first process will be described. This step is a step of making a hole in the electromagnetic steel sheet and placing a nonmagnetic alloy chip in the hole. This step is performed by the punching unit 2 in the punching and pressing apparatus 1 of FIG. In this step, first, the electromagnetic steel plate 8 and the alloy plate 9 as the target members are placed on the lower holding member 42 and the die 52 of the punched portion 2 so as to overlap each other. The electromagnetic steel plate 8 is below and the alloy plate 9 is positioned thereon. In this state, the upper holding member 41 is lowered as shown in FIG. As a result, the electromagnetic steel plate 8 and the alloy plate 9 are sandwiched and fixed from above and below by the upper holding member 41 and the lower holding member 42 of the holding portion 4.
 ここで,合金板9は,後述する非磁性改質工程(第3の工程)で溶融される合金チップ91(図10参照)となる合金の板材である。その際,その周囲の電磁鋼板とともに溶融して混合し,凝固後に非磁性箇所10(図11参照)を形成するような組成のものである。合金板9自体は磁性体でも非磁性体でもよいが,電磁鋼板に由来する鉄との混合後に非磁性体となる組成でなければならない。すなわち合金板9は,電磁鋼板の鉄を非磁性体に改質する機能を有する改質金属の板材であるといえる。ここでは,ニッケル-クロム合金を用いているものとする。厚さは,電磁鋼板8と合金板9とで公称値としては同じである。 Here, the alloy plate 9 is a plate material of an alloy that becomes an alloy chip 91 (see FIG. 10) to be melted in a non-magnetic modification step (third step) described later. At that time, the composition is such that it melts and mixes with the surrounding electrical steel sheet to form a nonmagnetic portion 10 (see FIG. 11) after solidification. The alloy plate 9 itself may be a magnetic material or a non-magnetic material, but it must have a composition that becomes a non-magnetic material after mixing with iron derived from an electromagnetic steel plate. That is, the alloy plate 9 can be said to be a modified metal plate having a function of modifying the iron of the electromagnetic steel sheet into a non-magnetic material. Here, nickel-chromium alloy is used. The thickness of the electromagnetic steel plate 8 and the alloy plate 9 is the same as the nominal value.
 図2の状態から,シリンダ55によりパンチ51を下降させ,図3の状態とする。さらにパンチ51を下降させると,スリーブ部54は下がらずに芯部53のみが下降して,電磁鋼板8および合金板9がともに打ち抜かれる。この状態を図4に示す。このとき,押し返し部材56が存在しているため,打ち抜かれた打ち抜き片であるチップ83,91は,押し返し部材56に受け止められ,落下することなくその場に留まっている。すなわち図4の状態ではチップ83,91は,芯部53と押し返し部材56とにより挟み付けられて保持されている。なお,当然ながら電磁鋼板8および合金板9は,打ち抜かれた箇所に穴82,92が開いた状態となっている。チップ83,91および穴82,92は当然,すべて同じ形である。 From the state shown in FIG. 2, the punch 51 is lowered by the cylinder 55 to obtain the state shown in FIG. When the punch 51 is further lowered, only the core portion 53 is lowered without lowering the sleeve portion 54, and both the electromagnetic steel plate 8 and the alloy plate 9 are punched out. This state is shown in FIG. At this time, since the push-back member 56 exists, the chips 83 and 91 which are punched pieces are received by the push-back member 56 and remain in place without falling. That is, in the state of FIG. 4, the chips 83 and 91 are held by being sandwiched between the core portion 53 and the pushback member 56. Needless to say, the electromagnetic steel plate 8 and the alloy plate 9 have holes 82 and 92 opened at the punched portions. Of course, the tips 83 and 91 and the holes 82 and 92 all have the same shape.
 図4の状態から,シリンダ55の操作により,パンチ51を少し上方へ引き戻す。するとバネ57の付勢により,押し返し部材56もその分上方へ移動する。つまり,チップ83,91を上方へ押し返す。この押し返しの向きは,前述の打ち抜きの向きと逆向きである。これにより図5の状態とする。図5の状態では,合金板9から打ち抜かれた合金チップ91が,電磁鋼板8と同じ高さに位置している。つまり,電磁鋼板8の穴82に合金チップ91が嵌め合わせられている。嵌め合わせはスムーズに行われ,嵌め合わせた合金チップ91と電磁鋼板8の穴82との間に隙間はほとんどない。前述のように両者は同じ形だからである。 From the state of FIG. 4, the punch 51 is pulled back slightly upward by operating the cylinder 55. Then, due to the urging of the spring 57, the pushing back member 56 is also moved upward. That is, the chips 83 and 91 are pushed back upward. The direction of pushing back is opposite to the direction of punching described above. Thus, the state shown in FIG. 5 is obtained. In the state of FIG. 5, the alloy tip 91 punched from the alloy plate 9 is located at the same height as the electromagnetic steel plate 8. That is, the alloy chip 91 is fitted in the hole 82 of the electromagnetic steel plate 8. The fitting is performed smoothly, and there is almost no gap between the fitted alloy chip 91 and the hole 82 of the electromagnetic steel sheet 8. This is because they are the same shape as described above.
 これが第1の工程である。この状態で保持部4の締め付けを緩めて,電磁鋼板8および合金チップ91をスライドさせて打ち抜き部2から取り出せばよい。このとき,電磁鋼板8および合金チップ91の厚さはほぼ等しいので,スムーズにスライドさせることができる。 This is the first step. In this state, the holding part 4 may be loosened and the electromagnetic steel plate 8 and the alloy chip 91 may be slid out of the punched part 2. At this time, since the thickness of the electromagnetic steel plate 8 and the alloy chip 91 is substantially equal, it can be smoothly slid.
 かくして,打ち抜かれた穴82の箇所が合金チップ91で嵌め換えられた電磁鋼板8が得られる。ただしこの段階では,合金チップ91は電磁鋼板8に対して未だ拘束されているわけではない。なお,合金板9と電磁鋼板チップ83は,そのままその場所に残される。電磁鋼板チップ83はその後に廃棄される。合金板9は,穴92が開いた位置を避けつつ再利用される。 Thus, the electromagnetic steel sheet 8 in which the punched hole 82 is replaced with the alloy chip 91 is obtained. However, at this stage, the alloy chip 91 is not yet restrained with respect to the electromagnetic steel sheet 8. The alloy plate 9 and the electromagnetic steel plate chip 83 are left in place. The electromagnetic steel plate chip 83 is then discarded. The alloy plate 9 is reused while avoiding the position where the hole 92 is opened.
[第2の工程]
 続いて,第2の工程である嵌め換え部プレス工程について説明する。この工程は,図1の打ち抜きおよびプレス装置1におけるプレス部3で実施される。このため,打ち抜き部2で嵌め換えられた電磁鋼板8および合金チップ91は,打ち抜き部2からプレス部3へとスライド移動させられる。このときのスライド移動はスムーズである。プレス部3の下部材6と打ち抜き部2の下保持部材42とが,中間板11を介して同一面をなして繋がっているからである。このため,移動の途中で合金チップ91が電磁鋼板8から外れるようなことはない。
[Second step]
Then, the fitting part press process which is a 2nd process is demonstrated. This step is performed in the stamping and pressing unit 3 in the pressing device 1 of FIG. For this reason, the electromagnetic steel plate 8 and the alloy chip 91 fitted in the punched portion 2 are slid from the punched portion 2 to the press portion 3. The slide movement at this time is smooth. This is because the lower member 6 of the press part 3 and the lower holding member 42 of the punched part 2 are connected to each other through the intermediate plate 11 on the same surface. For this reason, the alloy chip 91 is not detached from the electromagnetic steel sheet 8 during the movement.
 プレス部3では,合金チップ91の全体がプレス部材7により押圧される範囲内に位置するように,電磁鋼板8および合金チップ91がセットされる。このようにセットした状態で図6に示すように,プレス部材7によるプレスが行われる。これにより,合金チップ91の全体,および,電磁鋼板8のうち合金チップ91の周囲の部分が,プレス部材7により押圧される。 In the pressing unit 3, the electromagnetic steel plate 8 and the alloy chip 91 are set so that the entire alloy chip 91 is positioned within the range pressed by the press member 7. In the state set in this way, as shown in FIG. As a result, the entire alloy chip 91 and the portion around the alloy chip 91 in the electromagnetic steel sheet 8 are pressed by the press member 7.
 この第2の工程を行う目的は2つある。第1の目的は,板厚の個体差に起因する電磁鋼板8と合金チップ91との段差の解消である。第2の目的は,合金チップ91が電磁鋼板8から容易に外れないようにすることである。 There are two purposes for performing this second step. The first purpose is to eliminate the step between the electromagnetic steel sheet 8 and the alloy chip 91 due to individual differences in sheet thickness. The second purpose is to prevent the alloy chip 91 from being easily detached from the electromagnetic steel sheet 8.
 第1の目的について説明する。電磁鋼板8と合金板9とで厚さが公称値としては同じである旨前に述べたが,実際には量産品であれば若干の個体差が存在する。この個体差によるばらつきの範囲内で,電磁鋼板8と合金板9とで厚さが異なる可能性がある。この厚さの差異により,電磁鋼板8と合金チップ91との境に段差があると,後の非磁性改質工程(第3の工程)に支障を来す場合があるのである。その支障の詳細は後に非磁性改質工程のところで述べる。この段差の解消ないし緩和が第2の工程を行う第1の目的である。 The first purpose will be described. Although it has been described before that the electromagnetic steel plate 8 and the alloy plate 9 have the same nominal thickness, there are actually some individual differences in mass-produced products. There is a possibility that the electromagnetic steel plate 8 and the alloy plate 9 have different thicknesses within the range of variations due to individual differences. Due to this difference in thickness, if there is a step at the boundary between the electromagnetic steel sheet 8 and the alloy chip 91, the subsequent nonmagnetic modification step (third step) may be hindered. Details of the trouble will be described later in the non-magnetic modification step. The elimination or alleviation of this step is the first purpose of performing the second step.
 つまり,図7の拡大図(図6のうち一点鎖線で示す範囲Aの拡大図)に示すように,電磁鋼板8の表面8Fと合金チップ91の表面91Fとが段差のほとんどないフラットな面をなし,電磁鋼板8の裏面8Rと合金チップ91の裏面91Rとも段差のほとんどないフラットな面をなすようにするのである。したがってここでのプレスの荷重Gは,板厚の個体差に基づく段差を解消できる程度の比較的軽いものでよい。電磁鋼板8等に明確な打痕がつくほどの重い荷重をかける必要はない。 That is, as shown in the enlarged view of FIG. 7 (enlarged view of the range A indicated by the alternate long and short dash line in FIG. 6), the surface 8F of the electromagnetic steel plate 8 and the surface 91F of the alloy chip 91 are flat surfaces having almost no steps. None, the back surface 8R of the electromagnetic steel sheet 8 and the back surface 91R of the alloy chip 91 are flat surfaces with almost no step. Therefore, the load G of the press here may be relatively light enough to eliminate the step based on the individual difference in the plate thickness. It is not necessary to apply such a heavy load as to make a clear dent on the electromagnetic steel sheet 8 or the like.
 第2の目的は要するに,合金チップ91を面内方向に外向きにやや押し広げ,逆に電磁鋼板8のうち合金チップ91の周囲の部分を面内方向に合金チップ91に向かって内向きに押し広げることである。つまり,図8の拡大図(図7と同じ範囲を示す。)に示すように,プレスの荷重Gは,合金チップ91と電磁鋼板8との両方に掛かる。このため,合金チップ91に掛かる荷重G1により,合金チップ91は外向きにやや押し広げられる(P)。また,電磁鋼板8に掛かる荷重G2により,電磁鋼板8のうち合金チップ91の周囲の部分が内向きにやや押し広げられる(Q)。 In short, the second purpose is to slightly spread the alloy chip 91 outward in the in-plane direction, and conversely, the portion around the alloy chip 91 of the electromagnetic steel sheet 8 is directed inward toward the alloy chip 91 in the in-plane direction. It is to spread. That is, as shown in the enlarged view of FIG. 8 (showing the same range as FIG. 7), the press load G is applied to both the alloy tip 91 and the electromagnetic steel plate 8. For this reason, the alloy chip 91 is slightly pushed outward by the load G1 applied to the alloy chip 91 (P). Further, the portion around the alloy chip 91 of the electromagnetic steel sheet 8 is slightly expanded inward by the load G2 applied to the electromagnetic steel sheet 8 (Q).
 この,合金チップ91の外向きへの押し広げPと,電磁鋼板8の内向きへの押し広げQとのうち少なくとも一方が必ず起こる。これにより,合金チップ91と電磁鋼板8とが面内方向で互いに押圧し合うことで合金チップ91が電磁鋼板8に拘束される状態となる。これにより,第3の工程を行う前に合金チップ91が電磁鋼板8から外れることを防止するのである。このような状態は,第1の目的のところで述べた程度の比較的軽いプレス荷重で十分に達成される。以下,第2の工程を経た電磁鋼板を嵌め換え電磁鋼板という。 At least one of the outward spreading P of the alloy chip 91 and the inward spreading Q of the electromagnetic steel sheet 8 always occurs. As a result, the alloy chip 91 and the electromagnetic steel plate 8 are pressed against each other in the in-plane direction, so that the alloy chip 91 is restrained by the electromagnetic steel plate 8. This prevents the alloy chip 91 from being detached from the electromagnetic steel sheet 8 before performing the third step. Such a state is satisfactorily achieved with a relatively light press load as described in the first object. Hereinafter, the electromagnetic steel sheet that has undergone the second step is referred to as a refit electromagnetic steel sheet.
[第3の工程]
 続いて,第3の工程すなわち非磁性改質工程について説明する。この工程は,第2の工程で得られた嵌め換え電磁鋼板を他の電磁鋼板とともに重ね合わせて,一体化するとともに合金チップ91およびその周辺の箇所を非磁性箇所に改質する工程である。この工程ではまず,図9に示すように,嵌め換え電磁鋼板80を,他の2枚の電磁鋼板81とともに重ね合わせる。嵌め換え電磁鋼板80が真ん中に位置するようにする。嵌め換え電磁鋼板80には前述のように,合金チップ91である部分がある。他の2枚の電磁鋼板81にはいずれもそのような部分はない。他の電磁鋼板81としては,前述の第1の工程に供する前の電磁鋼板8と同じものを用いればよい。
[Third step]
Subsequently, the third step, that is, the nonmagnetic modification step will be described. This step is a step of superimposing and integrating the refit electromagnetic steel plate obtained in the second step together with other electromagnetic steel plates, and reforming the alloy chip 91 and its surrounding locations to nonmagnetic locations. In this step, first, as shown in FIG. 9, the refit electromagnetic steel sheet 80 is superposed together with the other two electromagnetic steel sheets 81. The fitting electromagnetic steel sheet 80 is positioned in the middle. As described above, there is a portion that is the alloy chip 91 in the magnetic steel sheet 80 to be fitted. None of the other two electromagnetic steel sheets 81 have such a portion. The other electromagnetic steel plate 81 may be the same as the electromagnetic steel plate 8 before being subjected to the first step described above.
 この,電磁鋼板の重ね合わせを行う際には必ず,嵌め換え電磁鋼板80を作業台から持ち上げる場面が存在する。しかしそのような場面でも,嵌め換え電磁鋼板80から合金チップ91が脱落することはない。第2の工程でのプレスにより合金チップ91が嵌め換え電磁鋼板80に拘束されているからである。そして,重ね合わせた状態で嵌め換え電磁鋼板80と他の電磁鋼板81との間に目立って隙間が存在することもない。前述のように第2の工程でのプレス圧は,嵌め換え電磁鋼板80に打痕がつくほど重いものではないからである。 When performing the superposition of electromagnetic steel sheets, there is always a scene where the refit electromagnetic steel sheet 80 is lifted from the work table. However, even in such a situation, the alloy tip 91 does not fall off from the fitted electromagnetic steel sheet 80. This is because the alloy chip 91 is restrained by the refit electromagnetic steel sheet 80 by pressing in the second step. Further, there is no conspicuous gap between the refitable electromagnetic steel sheet 80 and the other electromagnetic steel sheet 81 in the overlapped state. This is because the press pressure in the second step is not so heavy that the fitting electromagnetic steel sheet 80 has a dent as described above.
 そして,重ね合わせられた3枚の電磁鋼板の積層体を,図10に示すように電極対12,12で挟み付ける。挟み付ける箇所はむろん,嵌め換え電磁鋼板80における合金チップ91のある箇所である。そして,スポット溶接と類似の要領でその箇所を電極対12,12で加圧しつつ電流を印加する。すると,この電流のジュール熱により合金チップ91が溶融し,その溶融液が通電終了後に再凝固することにより,図11に示すように非磁性箇所10が形成される。ここで合金チップ91が溶融する際には,電磁鋼板80,81のうち合金チップ91の周囲の部分も一緒に溶融する。ただし電磁鋼板81,81に穴が開く程ではない。 Then, the laminated body of the three electromagnetic steel plates stacked is sandwiched between the electrode pairs 12 and 12 as shown in FIG. Of course, the place to be sandwiched is the place with the alloy chip 91 in the magnetic steel sheet 80 to be fitted. Then, a current is applied while pressurizing the portion with the electrode pairs 12 and 12 in a manner similar to spot welding. Then, the alloy chip 91 is melted by the Joule heat of this current, and the melt is re-solidified after the end of energization, thereby forming a nonmagnetic portion 10 as shown in FIG. Here, when the alloy tip 91 is melted, the portions around the alloy tip 91 of the electromagnetic steel plates 80 and 81 are also melted together. However, the electromagnetic steel plates 81 and 81 are not so large as to have holes.
 この結果,できあがった非磁性箇所10は,厚さ,径ともに,通電前の合金チップ91のサイズよりも大きくなっている。また,非磁性箇所10の元素組成は,元の合金チップ91の成分元素に対し,一緒に溶融した部分の電磁鋼板に由来する鉄分が混入された組成となっている。この組成は,オーステナイト型非磁性組織をなす組成である。 As a result, the completed nonmagnetic portion 10 is larger in both thickness and diameter than the size of the alloy tip 91 before energization. In addition, the elemental composition of the nonmagnetic portion 10 is a composition in which the iron component derived from the electromagnetic steel sheet melted together with the component elements of the original alloy chip 91 is mixed. This composition is an austenite-type nonmagnetic structure.
 図11の状態では,非磁性箇所10の厚さは真ん中の電磁鋼板80の厚さよりも厚い。すなわち非磁性箇所10は,上下の電磁鋼板80,80に部分的に食い込んで形成されている。このため非磁性箇所10のある箇所では,電磁鋼板80の厚さが,それ以外の箇所における電磁鋼板80の厚さよりも薄くなっている。具体的には半分以下の厚さとなっている。したがって非磁性箇所10のある箇所では,電磁鋼板3枚分の厚さのうち,非磁性箇所10が電磁鋼板2枚分以上の厚さを占めている。電磁鋼板80のまま残っている磁性体の厚さは,表裏両面分を合わせても元の電磁鋼板1枚分の厚さにも満たない。このため,改質後の電磁鋼板における非磁性箇所10のある箇所は,その大部分が非磁性体で占められており,実質的に非磁性であると評価できる。 In the state of FIG. 11, the thickness of the nonmagnetic portion 10 is thicker than the thickness of the middle electromagnetic steel sheet 80. That is, the nonmagnetic portion 10 is formed by partially biting into the upper and lower electromagnetic steel plates 80 and 80. For this reason, the thickness of the electromagnetic steel plate 80 is thinner than the thickness of the electromagnetic steel plate 80 in other locations at the location where the nonmagnetic location 10 exists. Specifically, the thickness is less than half. Therefore, in the place with the nonmagnetic part 10, the nonmagnetic part 10 occupies the thickness more than two electromagnetic steel sheets among the thickness for three electromagnetic steel sheets. The thickness of the magnetic material remaining as the electromagnetic steel sheet 80 is less than the thickness of one original electromagnetic steel sheet even if both the front and back surfaces are combined. For this reason, most of the non-magnetic portion 10 in the modified electrical steel sheet is occupied by the non-magnetic material, and can be evaluated as being substantially non-magnetic.
 かかる非磁性改質工程においては,嵌め換え電磁鋼板80がプレス工程(第2の工程)を経ていることにより,非磁性箇所10が良好に大きく形成されている。プレス工程を経ていない嵌め換え電磁鋼板を使用すると,非磁性箇所10の形成が不十分となることがあるのである。その理由は,[0029]で述べた板厚の個体差にある。特に,嵌め換え電磁鋼板80とその中の合金チップ91との間に板厚差があると,通電時の電流が十分に合金チップ91を通らない場合がある。そのような場合に非磁性箇所10の形成が不十分となるのである。 In such a non-magnetic modification process, the non-magnetic portion 10 is formed in a favorable size because the magnetic steel sheet 80 to be fitted has undergone a pressing process (second process). If a refit electromagnetic steel sheet that has not undergone a pressing process is used, the formation of the nonmagnetic portion 10 may be insufficient. The reason is due to the individual differences in thickness as described in [0029]. In particular, if there is a difference in plate thickness between the refitable electromagnetic steel sheet 80 and the alloy chip 91 therein, the current during energization may not sufficiently pass through the alloy chip 91. In such a case, the formation of the nonmagnetic portion 10 becomes insufficient.
 合金チップ91が嵌め換え電磁鋼板80より薄かった場合を説明する。この場合には図12に示すように,重ね合わせ後通電前の状態で,合金チップ91と上側の電磁鋼板81との間に隙間13があることになる。隙間13は,板面のうち合金チップ91が占める範囲全体にわたって存在する。むろん図12中に示される隙間13は大袈裟に描いたものであり,実際にはこれほど大きくはない。 The case where the alloy chip 91 is thinner than the refit electromagnetic steel sheet 80 will be described. In this case, as shown in FIG. 12, there is a gap 13 between the alloy chip 91 and the upper electromagnetic steel plate 81 in a state before energization after superposition. The gap 13 exists over the entire range of the plate surface occupied by the alloy chip 91. Needless to say, the gap 13 shown in FIG. 12 is drawn in large size and is not so large in practice.
 しかしこの隙間13のため,合金チップ91と上側の電磁鋼板81とはほとんど接触していない。このため,通電時の電流が合金チップ91にはほとんど流れない。図12中に矢印Eで示すように,電流は隙間13を避けて合金チップ91の周囲の電磁鋼板の組織中を流れることとなる。このため,合金チップ91の中央部がほとんど溶融せず,縁辺部のみが若干溶融する程度に留まる。これにより図13に示すような形状の非磁性箇所10しか形成されないこととなる。図13の非磁性箇所10は,中央部ではほとんど元の合金チップ91の厚さのままの厚さしかない。これでは,電磁鋼板の磁性体の組織が多く残ってしまっており,非磁性箇所10としての機能が不十分である。また,特に,溶融前の合金チップ91が磁性体である場合には,未溶融の合金チップ91が残存することも,非磁性箇所10としての機能が十分得られない原因となる。 However, due to the gap 13, the alloy chip 91 and the upper electromagnetic steel plate 81 are hardly in contact with each other. For this reason, almost no current flows through the alloy tip 91 during energization. As shown by an arrow E in FIG. 12, the current flows in the structure of the electromagnetic steel sheet around the alloy chip 91 while avoiding the gap 13. For this reason, the center part of the alloy tip 91 is hardly melted, and only the edge part is slightly melted. As a result, only the nonmagnetic portion 10 having a shape as shown in FIG. 13 is formed. The nonmagnetic portion 10 in FIG. 13 has only the thickness of the original alloy chip 91 at the center. In this case, a large amount of the magnetic structure of the electromagnetic steel sheet remains, and the function as the nonmagnetic portion 10 is insufficient. In particular, in the case where the alloy tip 91 before melting is a magnetic material, the remaining unmelted alloy tip 91 is also a cause of insufficient function as the nonmagnetic portion 10.
 これに対しプレス工程を経た嵌め換え電磁鋼板80を用いた場合には,図12に示した隙間ができることがない。プレス工程で電磁鋼板80と合金チップ91との境の段差が排除されているからである。このため,重ね合わせ後通電前の状態で,合金チップ91の全面が上側の電磁鋼板81と隙間なく接触しているのである。当然,合金チップ91は下側の電磁鋼板81とも隙間なく接触している。このため,通電時の電流の大部分が合金チップ91を通ることとなる。したがって,合金チップ91は中央部も縁辺部も溶融して,図11に示した良好な形状の非磁性箇所10が形成されるのである。なお,電磁鋼板81における穴82の周囲のプレスされる範囲は,全周にわたり径方向に1mm以上の幅があることが望ましい。このため,プレス部材7の直径は,芯部53の直径より2mm以上大きいことが望ましい。 On the other hand, when the electromagnetic steel sheet 80 that has been subjected to the pressing process is used, there is no gap shown in FIG. This is because a step at the boundary between the electromagnetic steel sheet 80 and the alloy chip 91 is eliminated in the pressing process. For this reason, the entire surface of the alloy chip 91 is in contact with the upper electromagnetic steel plate 81 without any gap in a state before energization after the overlapping. Of course, the alloy chip 91 is also in contact with the lower electromagnetic steel sheet 81 without a gap. For this reason, most of the current during energization passes through the alloy tip 91. Therefore, the alloy chip 91 is melted at both the central portion and the edge portion, and the non-magnetic portion 10 having a good shape shown in FIG. 11 is formed. In addition, as for the range to be pressed around the hole 82 in the electromagnetic steel sheet 81, it is desirable that the entire circumference is 1 mm or more in the radial direction. For this reason, the diameter of the press member 7 is desirably 2 mm or more larger than the diameter of the core portion 53.
 なお,図12に示したのと逆に合金チップ91が嵌め換え電磁鋼板80より厚かった場合については,板厚差の存在による弊害はそれほど大きくはない。合金チップ91の肩部が確実に上側の電磁鋼板81と接触するからである。さらに,電極対12,12の押圧により,合金チップ91の中央部分も上側の電磁鋼板81と接触するからである。むろんこれも板厚差が過大であれば,通電後にボイドが残るとか,あるいは電極対12,12の押圧をもってしても合金チップ91の中央部分が上側の電磁鋼板81と接触しない等の弊害もあり得る。しかし通常の板厚のばらつきの範囲内ではそこまでの板厚差には至らない。 Incidentally, in the case where the alloy chip 91 is thicker than the electromagnetic steel sheet 80 to be fitted in the reverse direction as shown in FIG. 12, the adverse effect due to the presence of the difference in sheet thickness is not so great. This is because the shoulder portion of the alloy tip 91 is surely in contact with the upper electromagnetic steel plate 81. Furthermore, it is because the center part of the alloy chip | tip 91 also contacts the upper electromagnetic steel plate 81 by the press of the electrode pairs 12 and 12. FIG. Of course, if the plate thickness difference is excessive, there is a problem that voids remain after energization or that the central portion of the alloy tip 91 does not contact the upper electromagnetic steel plate 81 even when the electrode pairs 12 and 12 are pressed. possible. However, the difference in thickness is not reached within the range of normal thickness variations.
[確認試験]
 ここで,本発明者らが行った,本発明の効果を確認する試験の結果を説明する。ここでは,脱落発生試験と,改質試験との2通りの試験を行った。このうちの脱落発生試験は,次の通りの条件で第2の工程までを行った。
  板厚(電磁鋼板,合金板とも)   0.3±0.01mm
  電磁鋼板の組成          Si含有率3%(残部はFe)
  合金板の組成           Cr含有率20%(残部はNi)
  打ち抜き径(直径)        3mm
  プレス時のプレス範囲の径(直径) 8mm
  プレス時の平均面圧        1000MPa
[Confirmation test]
Here, the result of the test conducted by the present inventors to confirm the effect of the present invention will be described. Here, two tests, a drop-off occurrence test and a reforming test, were performed. Among these, the drop-off occurrence test was performed up to the second step under the following conditions.
Plate thickness (both electromagnetic steel plate and alloy plate) 0.3 ± 0.01mm
Composition of electrical steel sheet Si content 3% (the balance is Fe)
Alloy plate composition Cr content 20% (the balance is Ni)
Punching diameter (diameter) 3mm
Press range diameter during pressing (diameter) 8mm
Average surface pressure during pressing 1000 MPa
 この条件で嵌め換え電磁鋼板80を100枚作成し,それぞれ積み重ね作業(図9)に供した。この結果,脱落の発生は皆無であった。本発明者らの経験では,プレス工程(第2の工程)を行わずに積み重ね作業を行えば20~70%程度の確率で脱落が発生する。これと比較すれば,プレス工程による脱落防止効果は明らかである。なお,これらの供試体において,プレスした箇所の板厚の減少は,5~20μm程度であった。また,プレスした領域内において,電磁鋼板80と合金チップ91との板厚差が5μmを上回っているものは存在しなかった。 100 Under this condition, 100 sheets of electromagnetic steel sheets 80 to be fitted were prepared, and each was subjected to stacking work (Fig. 9). As a result, no dropout occurred. According to the experience of the present inventors, if the stacking operation is performed without performing the pressing step (second step), the dropout occurs with a probability of about 20 to 70%. Compared with this, the drop prevention effect by the pressing process is clear. In these specimens, the reduction in the thickness of the pressed part was about 5 to 20 μm. Further, in the pressed region, there was no case where the thickness difference between the electromagnetic steel plate 80 and the alloy chip 91 exceeded 5 μm.
 次に改質試験は,実施例と比較例との2通りを作成して比較することで行った。実施例の供試体については,基本的に上記と同じ条件で第2の工程までを行い,さらに第3の工程を行った。ただしいずれも,第1の工程の実施時に,電磁鋼板8が合金板9より20μm厚くなるように各板材を選んで使用した。比較例については,第1の工程の後,第2の工程を経ずに第3の工程に供した点を除き実施例と同様とした。ここでの第3の工程は,次の条件で行った。
  電極の通電対象物への接触面の径(直径) 8mm
  電極の通電対象物への接触面の曲率半径  1000mm
  電極の加圧荷重             2kN
  電流値                 8kA
  通電時間                0.15秒
Next, the modification test was performed by making and comparing two types of examples and comparative examples. For the specimens of the examples, basically up to the second step was performed under the same conditions as described above, and the third step was further performed. However, in each case, each plate material was selected and used so that the electromagnetic steel plate 8 was 20 μm thicker than the alloy plate 9 when the first step was performed. About the comparative example, it was made to be the same as that of an Example except the point used for the 3rd process without passing through the 2nd process after the 1st process. The third step here was performed under the following conditions.
Diameter (diameter) of the contact surface of the electrode to the energized object 8mm
1000mm radius of curvature of contact surface of electrode to energized object
Electrode pressure load 2kN
Current value 8kA
Energizing time 0.15 seconds
 これらの実施例および比較例の各供試体について,第3の工程後に形成されている非磁性箇所10の中央部での厚さを,断面顕微鏡観察にて測定した。そしてその厚さの,第1の工程で重ね合わせた電磁鋼板3枚分の全厚に対する比を,改質率(%)とした。実施例および比較例のそれぞれについての改質率の分布を,図14のグラフに示す。実施例の改質率の分布範囲は65~80%であった。一方,比較例の改質率の分布範囲は45~80%であり,改質率が65%に満たないものが半分ほど存在した。この実施例と比較例との比較から,実施例のものでは65%以上の改質率が確保されており,ばらつきの少ない安定した品質が得られていることが分かる。 For each specimen of these Examples and Comparative Examples, the thickness at the center of the nonmagnetic portion 10 formed after the third step was measured by cross-sectional microscope observation. The ratio of the thickness to the total thickness of the three electromagnetic steel sheets stacked in the first step was defined as the reforming rate (%). The distribution of the reforming rate for each of the examples and comparative examples is shown in the graph of FIG. The distribution range of the reforming rate in the examples was 65 to 80%. On the other hand, the distribution range of the reforming rate in the comparative example was 45 to 80%, and about half of the reforming rates were less than 65%. From a comparison between this example and the comparative example, it can be seen that the reforming rate of 65% or more is secured in the example, and a stable quality with little variation is obtained.
[プレス部の変形例]
 打ち抜きおよびプレス装置1におけるプレス部3については,次に述べる変形が可能である。すなわち,図6に示した円柱形状のプレス部材7に替えて図15に示すように円筒形状のプレス部材71を用いるのである。ここで円筒形状のプレス部材71は,外径(直径)が打ち抜き部2の芯部53の直径より大きく,内径が芯部53の直径より小さいものでなければならない。
[Modification of press section]
The press part 3 in the punching and pressing apparatus 1 can be modified as described below. That is, instead of the columnar press member 7 shown in FIG. 6, a cylindrical press member 71 is used as shown in FIG. Here, the cylindrical press member 71 must have an outer diameter (diameter) larger than the diameter of the core portion 53 of the punched portion 2 and an inner diameter smaller than the diameter of the core portion 53.
 このようなプレス部材71を用いると,プレス工程(第2の工程)にてプレスされる範囲は,合金チップ91の縁辺部分,および,電磁鋼板8のうち合金チップ91の周囲の部分である。つまり,合金チップ91についてはその全体がプレスされるのではなく,縁辺部分のみが押圧される。合金チップ91の中央部分は押圧されないのである。このように合金チップ91と電磁鋼板8との境目に隣接する部分が押圧されるだけであっても,[0028]~[0032]で述べた第1および第2の目的はいずれも十分に達成される。したがって,円筒形状のプレス部材71を用いる場合でも,円柱形状のプレス部材7を用いる場合と同様の効果が奏される。なお,合金チップ91の縁辺のプレスされる範囲は,全周にわたり径方向に1mm以上の幅があることが望ましい。このため,芯部53の直径は,プレス部材71の内径(直径)より2mm以上大きいことが望ましい。 When such a press member 71 is used, the range to be pressed in the pressing step (second step) is the edge portion of the alloy tip 91 and the portion around the alloy tip 91 in the electromagnetic steel plate 8. That is, the entire alloy chip 91 is not pressed, but only the edge portion is pressed. The central part of the alloy tip 91 is not pressed. Thus, even if only the portion adjacent to the boundary between the alloy chip 91 and the electromagnetic steel sheet 8 is pressed, both the first and second objects described in [0028] to [0032] are sufficiently achieved. Is done. Therefore, even when the cylindrical press member 71 is used, the same effect as that obtained when the cylindrical press member 7 is used can be obtained. In addition, as for the range where the edge of the alloy chip | tip 91 is pressed, it is desirable to have a width | variety of 1 mm or more in radial direction over the perimeter. For this reason, the diameter of the core part 53 is desirably 2 mm or more larger than the inner diameter (diameter) of the press member 71.
 なお,円筒形状のプレス部材71を用いてプレスすると,プレスされない合金チップ91の中央部分が,プレスされる合金チップ91の縁辺部分よりごくわずかに厚い状態となる。しかしこのことは,合金チップ91の中央部分における電流経路の確保という意味ではむしろ有利なことである。また,プレス部3において電磁鋼板8等の下に位置する部材,すなわち下部材6についてもプレス部材71と同様に円筒状としてもよい。あるいは,下部材6のみ円筒状として円柱形状のプレス部材7と組み合わせて使用してもよい。 Note that when pressing is performed using the cylindrical pressing member 71, the center portion of the alloy chip 91 that is not pressed becomes slightly thicker than the edge portion of the alloy chip 91 that is pressed. However, this is rather advantageous in terms of securing a current path in the central portion of the alloy tip 91. In addition, the member located below the electromagnetic steel plate 8 or the like in the press portion 3, that is, the lower member 6 may be cylindrical like the press member 71. Alternatively, only the lower member 6 may be cylindrical and used in combination with the columnar press member 7.
 以上詳細に説明したように本実施の形態によれば,打ち抜き部2とプレス部3とを有する打ち抜きおよびプレス装置1を使用することとしている。その打ち抜き部2においては,パンチ51の芯部53により打ち抜かれた打ち抜き片を受け止めて押し返す押し返し部材56が設けられている。そして,電磁鋼板8と合金板9とを重ね合わせて同時に打ち抜くとともに,合金板9の打ち抜き片である合金チップ91が電磁鋼板8と同じ高さになるまで押し返し部材56で押し返すこととしている。これにより,電磁鋼板8の一部を合金チップ91で嵌め換えることを容易に実施できるようにした。 As described in detail above, according to the present embodiment, the punching and pressing apparatus 1 having the punching portion 2 and the press portion 3 is used. The punching portion 2 is provided with a pushing-back member 56 that receives and returns the punched piece punched by the core portion 53 of the punch 51. Then, the electromagnetic steel plate 8 and the alloy plate 9 are overlapped and punched at the same time, and the alloy chip 91 which is a punched piece of the alloy plate 9 is pushed back by the push-back member 56 until the same height as the electromagnetic steel plate 8 is reached. As a result, it is possible to easily carry out the fitting of a part of the electromagnetic steel sheet 8 with the alloy chip 91.
 そして打ち抜きおよびプレス装置1では,打ち抜き部2とプレス部3との間に中間板11を設けている。これにより,打ち抜き部2の下保持部材42の上面(およびダイ52の上面)とプレス部3の下部材6の上面とが同一面をなして繋がった状態としている。このため,打ち抜き部2で嵌め換えをした電磁鋼板8および合金チップ91を,合金チップ91の脱落なく,プレス部3へスライド移動させることができる。 In the punching and pressing apparatus 1, an intermediate plate 11 is provided between the punching part 2 and the pressing part 3. Thereby, the upper surface of the lower holding member 42 of the punched portion 2 (and the upper surface of the die 52) and the upper surface of the lower member 6 of the press portion 3 are connected to form the same surface. For this reason, the electromagnetic steel plate 8 and the alloy tip 91 that have been fitted in the punched portion 2 can be slid to the press portion 3 without the alloy tip 91 falling off.
 そしてプレス部3では,打ち抜き部2からスライド移動してきた電磁鋼板8および合金チップ91を,電磁鋼板8と合金チップ91との両者に跨ってプレス部材7またはプレス部材71でプレスすることとしている。これにより,電磁鋼板8と合金チップ91との間の製造ばらつきに起因する板厚差をも実質的に解消するようにしている。同時に,電磁鋼板8と合金チップ91とが互いに拘束しあって容易に外れないようにしている。これにより,積み重ね時の合金チップ91の脱落を防止するとともに,通電による改質が良好に行われる嵌め換え電磁鋼板を得ている。 And in the press part 3, the electromagnetic steel plate 8 and the alloy chip 91 which have been slid from the punching part 2 are pressed by the press member 7 or the press member 71 across both the electromagnetic steel sheet 8 and the alloy chip 91. As a result, the plate thickness difference caused by the manufacturing variation between the electromagnetic steel plate 8 and the alloy chip 91 is substantially eliminated. At the same time, the electromagnetic steel plate 8 and the alloy chip 91 are restrained from each other so that they are not easily detached. As a result, it is possible to obtain a refitable electrical steel sheet that prevents the alloy chips 91 from falling off during stacking and that is favorably modified by energization.
 かかる嵌め換え電磁鋼板を他の2枚の普通の電磁鋼板とともに積み重ねて通電改質を行うことで,合金チップ91を良好に溶融させて非磁性箇所10が形成されるようにしている。これにより,製造しやすく品質のばらつきも少ない,非磁性箇所を有する電磁鋼板の製造方法が実現されている。また,そのための使用に適した打ち抜きおよびプレス装置が実現されている。 By stacking such refit electromagnetic steel sheets together with the other two ordinary electromagnetic steel sheets and conducting energization reforming, the alloy chip 91 is melted satisfactorily so that the nonmagnetic portion 10 is formed. As a result, a method of manufacturing an electrical steel sheet having non-magnetic portions that is easy to manufacture and has little variation in quality has been realized. In addition, a punching and pressing device suitable for the use has been realized.
 なお,本実施の形態は単なる例示にすぎず,本発明を何ら限定するものではない。したがって本発明は当然に,その要旨を逸脱しない範囲内で種々の改良,変形が可能である。 Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof.
 例えば,打ち抜き部2において,前記の形態では,対象の板材を上から下へ打ち抜いて,打ち抜き片を下から上へ押し返すように構成した例を挙げた。しかしこれに限らず,板材を下から上へ打ち抜いて,打ち抜き片を上から下へ押し返すように構成することも可能である。また,打ち抜き部2とプレス部3との間の中間板11は,打ち抜き部2側の部材またはプレス部3側の部材と一体のものとしてもよいし,打ち抜き部2側からプレス部3側まで全体で一体のものとしてもよい。 For example, in the above-described embodiment, the punched portion 2 is configured to punch the target plate material from the top to the bottom and push the punched piece back from the bottom to the top. However, the present invention is not limited to this, and it is also possible to configure such that the plate material is punched from the bottom to the top and the punched piece is pushed back from the top to the bottom. The intermediate plate 11 between the punched portion 2 and the press portion 3 may be integrated with a member on the punched portion 2 side or a member on the press portion 3 side, or from the punched portion 2 side to the press portion 3 side. It may be integrated as a whole.
 そして,非磁性改質工程においては,両端の普通の電磁鋼板と真ん中の嵌め換え電磁鋼板とで厚さが異なっていてもよい。あるいは,2枚以上の嵌め換え電磁鋼板を同時に2枚の普通の電磁鋼板の間に挟み込んでもよい。 And, in the non-magnetic modification process, the thickness may be different between the ordinary electrical steel sheets at both ends and the middle-fit electromagnetic steel sheet. Alternatively, two or more fitted electromagnetic steel sheets may be sandwiched between two ordinary electromagnetic steel sheets at the same time.
1    打ち抜きおよびプレス装置
2    打ち抜き部
3    プレス部
41   上保持部材
42   下保持部材
53   芯部
56   押し返し部材
6    下部材
7,71 プレス部材
8,80 電磁鋼板
81   打ち抜き嵌め換え工程等を経ない電磁鋼板
82   電磁鋼板の穴
83   電磁鋼板のチップ
9    合金板
91   合金チップ
92   合金板の穴
10   非磁性箇所
11   中間板
DESCRIPTION OF SYMBOLS 1 Punching and pressing apparatus 2 Punching part 3 Pressing part 41 Upper holding member 42 Lower holding member 53 Core part 56 Push-back member 6 Lower member 7, 71 Press member 8, 80 Electromagnetic steel sheet 81 Electromagnetic steel sheet 82 which does not go through a punching and fitting process or the like Electromagnetic steel plate hole 83 Electromagnetic steel plate chip 9 Alloy plate 91 Alloy chip 92 Hole in alloy plate 10 Non-magnetic part 11 Intermediate plate

Claims (5)

  1. 穴が形成された電磁鋼板の前記穴に改質金属のチップを配置して,その配置した状態で前記改質金属のチップおよびその周囲の電磁鋼板に通電して溶融させて非磁性箇所を形成する,非磁性箇所を有する電磁鋼板の製造方法において,
     前記電磁鋼板の前記穴に前記改質金属のチップを配置する配置工程と,
     前記配置工程後に前記改質金属のチップおよびその周囲の電磁鋼板を厚さ方向にプレスすることにより,前記改質金属のチップとその周囲の電磁鋼板との厚さの差を減少させるプレス工程と,
     前記プレス工程を経た電磁鋼板および改質金属のチップを,前記配置工程および前記プレス工程を経ていない2枚の電磁鋼板の間に挟み込んで重ね合わせ,その重ね合わせられた状態の前記改質金属のチップおよびその周囲の電磁鋼板に通電する通電工程とを有することを特徴とする非磁性箇所を有する電磁鋼板の製造方法。
    A modified metal tip is placed in the hole of the electrical steel sheet in which the hole is formed, and a nonmagnetic portion is formed by energizing and melting the modified metal chip and the surrounding electrical steel sheet in the placed state. In the manufacturing method of electrical steel sheet having non-magnetic parts,
    An arrangement step of arranging the chip of the modified metal in the hole of the electromagnetic steel sheet;
    A pressing step for reducing the difference in thickness between the modified metal tip and the surrounding electrical steel sheet by pressing the modified metal chip and the surrounding electrical steel sheet in the thickness direction after the placing step; ,
    The electromagnetic steel plate and the modified metal chip that have undergone the pressing step are sandwiched and overlapped between two electromagnetic steel plates that have not undergone the placement step and the pressing step, and A method for producing an electrical steel sheet having a non-magnetic portion, comprising: an energization step of energizing the chip and the surrounding electrical steel sheet.
  2. 請求項1に記載の非磁性箇所を有する電磁鋼板の製造方法において,
     前記プレス工程では,前記改質金属のチップの縁辺部およびその周囲の電磁鋼板のみをプレスし,前記改質金属のチップの中央部をプレスしないことを特徴とする非磁性箇所を有する電磁鋼板の製造方法。
    In the manufacturing method of the electrical steel sheet which has a nonmagnetic location of Claim 1,
    In the pressing step, only the edge portion of the modified metal tip and the surrounding electromagnetic steel plate are pressed, and the central portion of the modified metal tip is not pressed. Production method.
  3. 請求項1または請求項2に記載の非磁性箇所を有する電磁鋼板の製造方法において,
     前記配置工程では,
      電磁鋼板と改質金属の板材とを重ね合わせて,
      重ね合わせた電磁鋼板と改質金属の板材とを,前記改質金属のチップの形状に厚さ方向に同時に打ち抜いて,前記電磁鋼板および改質金属の板材にともに,穴とチップとを形成し,
      打ち抜かれた電磁鋼板および改質金属のチップを打ち抜きの向きと逆向きに押し戻すことで,前記電磁鋼板の穴に前記改質金属のチップを嵌め合わせることを特徴とする非磁性箇所を有する電磁鋼板の製造方法。
    In the manufacturing method of the electrical steel sheet which has a nonmagnetic location of Claim 1 or Claim 2,
    In the placement step,
    Superimposing electromagnetic steel sheets and modified metal sheets,
    The superposed electromagnetic steel sheet and the modified metal plate are simultaneously punched into the shape of the modified metal chip in the thickness direction to form a hole and a chip in both the electromagnetic steel sheet and the modified metal sheet. ,
    An electromagnetic steel sheet having a non-magnetic portion, wherein the modified metal chip is fitted into the hole of the electromagnetic steel sheet by pushing back the punched electromagnetic steel sheet and the modified metal chip in a direction opposite to the punching direction. Manufacturing method.
  4. 請求項3に記載の非磁性箇所を有する電磁鋼板の製造方法において,
     打ち抜き部とプレス部とを有し,
      前記打ち抜き部は,
       板状対象物を上下から挟み付けて保持する上保持部材および下保持部材と,
       前記上保持部材および下保持部材に保持されている板状対象物の一部をその板面と交差する方向に打ち抜く打ち抜き部材と,
       板状対象物を挟んで前記打ち抜き部材の反対側に位置し,板状対象物から前記打ち抜き部材により打ち抜かれた打ち抜き片を,前記打ち抜き部材の打ち抜き動作の向きと逆向きに押し返す押し返し部材とを有し,
      前記プレス部は,
       板状対象物を載置する下部材と,
       前記下部材に載置されている板状対象物を上からプレスするプレス部材とを有し, 前記下保持部材の保持面と前記下部材の載置面とが同一面をなして繋がっている打ち抜きおよびプレス装置を用い,
     前記配置工程を前記打ち抜き部で行い,
     前記配置工程後の対象物を,前記下保持部材の保持面上から前記下部材の載置面上へスライドさせ,
     前記プレス工程を前記プレス部で行うことを特徴とする非磁性箇所を有する電磁鋼板の製造方法。
    In the manufacturing method of the electrical steel sheet which has a nonmagnetic location of Claim 3,
    It has a punched part and a press part,
    The punched portion is
    An upper holding member and a lower holding member for sandwiching and holding a plate-like object from above and below,
    A punching member for punching a part of the plate-like object held by the upper holding member and the lower holding member in a direction intersecting the plate surface;
    A push-back member that is located on the opposite side of the punching member across the plate-like object, and pushes back the punched piece punched from the plate-like object by the punching member in a direction opposite to the direction of the punching operation of the punching member. Have
    The press section is
    A lower member for placing a plate-like object;
    A pressing member that presses the plate-like object mounted on the lower member from above, and the holding surface of the lower holding member and the mounting surface of the lower member are connected to form the same surface Using punching and pressing equipment,
    Performing the placement step at the punched portion;
    Sliding the object after the placement step from the holding surface of the lower holding member onto the mounting surface of the lower member;
    A method for producing an electrical steel sheet having a nonmagnetic portion, wherein the pressing step is performed at the pressing portion.
  5.  打ち抜き部とプレス部とを有し,
      前記打ち抜き部は,
       板状対象物を上下から挟み付けて保持する上保持部材および下保持部材と,
       前記上保持部材および下保持部材に保持されている板状対象物の一部をその板面と交差する方向に打ち抜く打ち抜き部材と,
       板状対象物を挟んで前記打ち抜き部材の反対側に位置し,板状対象物から前記打ち抜き部材により打ち抜かれた打ち抜き片を,前記打ち抜き部材の打ち抜き動作の向きと逆向きに押し返す押し返し部材とを有し,
      前記プレス部は,
       板状対象物を載置する下部材と,
       前記下部材に載置されている板状対象物を上からプレスするプレス部材とを有し, 前記下保持部材の保持面と前記下部材の載置面とが同一面をなして繋がっていることを特徴とする打ち抜きおよびプレス装置。
    It has a punched part and a press part,
    The punched portion is
    An upper holding member and a lower holding member for sandwiching and holding a plate-like object from above and below,
    A punching member for punching a part of the plate-like object held by the upper holding member and the lower holding member in a direction intersecting the plate surface;
    A push-back member that is located on the opposite side of the punching member across the plate-like object, and pushes back the punched piece punched from the plate-like object by the punching member in a direction opposite to the direction of the punching operation of the punching member. Have
    The press section is
    A lower member for placing a plate-like object;
    A pressing member that presses the plate-like object mounted on the lower member from above, and the holding surface of the lower holding member and the mounting surface of the lower member are connected to form the same surface A punching and pressing device characterized by that.
PCT/JP2009/071625 2009-12-25 2009-12-25 Method for manufacturing magnetic steel sheet having nonmagnetic area, and punch/press apparatus WO2011077557A1 (en)

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