CN110710088B

CN110710088B - Tool and method for manufacturing laminate

Info

Publication number: CN110710088B
Application number: CN201880035813.0A
Authority: CN
Inventors: 小园武明; 莲尾裕介
Original assignee: Mitsui High Tec Inc
Current assignee: Mitsui High Tec Inc
Priority date: 2017-05-26
Filing date: 2018-05-10
Publication date: 2022-07-15
Anticipated expiration: 2038-05-10
Also published as: CN110710088A; JP6853732B2; JP2018201300A; WO2018216496A1

Abstract

A tool (100) comprising: a first member (110) configured to hold a laminated body; and a second component (120) configured to support the first component (110). The second component (120) comprises: a placement surface (121a) on which a plurality of first members (110) can be placed side by side; and a plurality of positioning holes (through holes 121b) that open in the placement surface (121 a). The first part (110) comprises: a plate (111) configured to support the stack; a holding section (112) configured to hold the stacked body supported by the plate (111) from an outer peripheral side; and a protrusion (113) that protrudes downward from the plate (111) and is inserted into the positioning hole of the second member (120).

Description

Tool and method for manufacturing laminate

Technical Field

The present disclosure relates to a tool and a method of manufacturing a laminate.

Background

Patent document 1 discloses a tool used in heat treatment of a pinion and a pipe. The tool comprises: a cylindrical side wall portion; and a bottom wall portion formed at an axial center portion of the side wall portion. A cylindrical support portion configured to support the pinion gear is provided on an upper surface of the bottom wall portion. A cylindrical support portion configured to support the pipe is provided on a lower surface of the bottom wall portion.

Reference list

Patent literature

Patent document 1: JP-A-2008-38194

Disclosure of Invention

Technical problem

An object of the present disclosure is to provide a tool and a method of manufacturing a laminated body using the same, which are effective in improving production efficiency and quality of an electromagnetic steel sheet laminated body.

Problem solving means

In accordance with an example of the present disclosure,

providing a tool, comprising: a first member configured to hold a stacked body of electromagnetic steel sheets; and

a second component configured to support the first component.

The second member includes: a placement surface on which a plurality of the first members can be placed side by side; and a plurality of positioning holes opened on the placement surface.

The first member includes: a plate configured to support the stack; a holding section configured to hold the stacked body supported by the plates from an outer peripheral side of the stacked body; and a protrusion protruding downward from the plate and inserted into the positioning hole.

In accordance with an example of the present disclosure,

provided is a method for manufacturing a laminate, comprising: holding a stacked body from an outer peripheral side of an electromagnetic steel sheet stacked body by a holding portion provided on a plate, and placing the stacked body on the plate, using a first member including the plate, the holding portion, and a protruding portion protruding downward from the plate;

Placing the first member holding the stacked body on a placement face on which a plurality of the first members can be placed side by side, using a second member including the placement face and a plurality of positioning holes that open in the placement face, and inserting the protruding portions into the positioning holes; and

placing the laminated body held by the first member in a heat treatment apparatus together with the first member and the second member.

Advantageous effects of the invention

According to the present disclosure, it is possible to provide a tool and a method of manufacturing a laminated body using the tool, which are effective for improving the production efficiency and quality stability of an electromagnetic steel sheet laminated body.

Drawings

Fig. 1 is a plan view of a stator core.

Fig. 2 is a cross-sectional view of a split core.

Fig. 3 is a schematic diagram showing the configuration of a laminate manufacturing system.

Fig. 4 is a schematic diagram showing a schematic configuration of the stacking apparatus.

Fig. 5 is a perspective view of the tool.

Fig. 6 is a plan view showing a state where the first tool is placed most closely on the second tool.

Fig. 7 is a plan view showing a modification of the first tool.

Fig. 8 is a sectional view of the joint between the plate and the retaining pin.

Fig. 9 is a schematic view showing a manufacturing process of the laminated body.

Fig. 10 is a schematic view showing a manufacturing process of the laminated body.

Fig. 11 is a schematic view showing a manufacturing process of the laminated body.

Fig. 12 is a schematic diagram showing a modification of the laminating apparatus.

Fig. 13 is a schematic view showing a manufacturing process of the laminated body.

Fig. 14 is a schematic view showing a manufacturing process of the laminated body.

Fig. 15 is a schematic view showing a manufacturing process of the laminated body.

Fig. 16 is a schematic view showing a manufacturing process of the laminated body.

Fig. 17 is a schematic view showing a manufacturing process of the laminated body.

List of reference markers

90.. Split core (laminate)

94.. iron core plate

Tool 100

Laminating device

A heat treatment apparatus

A first tool

A second tool

111

A holding portion

A protrusion portion

112A, 112B, 112c

A joint

121a

121b

121c

R1

Detailed Description

The embodiments will be described in detail hereinafter with reference to the accompanying drawings. In the description, the same elements or elements having the same function are denoted by the same reference numerals, and a repetitive description thereof will be omitted. The laminate manufacturing system according to the present embodiment is a system configured to manufacture a laminate of electromagnetic steel sheets.

(iron core of motor)

First, a specific example of the laminate is shown. The electromagnetic steel sheet laminated body described in detail below is a split core 90 used for manufacturing an armature such as a motor core 80. The motor core 80 shown in fig. 1 is a core of a stator of a motor, and includes: an annular yoke 81; and a plurality of teeth 82 protruding from an inner circumferential surface of the yoke 81. A plurality of (e.g., 12) teeth 82 are arranged at equal intervals along the circumferential direction of the yoke 81. The armature coils of the motor are wound around the teeth 82.

The motor core 80 can be divided into a plurality of (for example, 12) parts (hereinafter referred to as "split cores 90") arranged along the circumferential direction of the yoke 81. The split core 90 includes: an arc-shaped split yoke 91 along the circumferential direction; a protrusion 92 that protrudes from an inner peripheral surface (a surface as an inner peripheral surface of the yoke 81) of the split yoke 91; and a flange portion 93 provided at a tip end portion of the protruding portion 92 (an end portion on the opposite side of the split yoke 91). The split yoke 91 constitutes the yoke 81, and the protruding portion 92 and the flange portion 93 constitute the teeth 82. The protruding portion 92 is located between both end portions in the circumferential direction of the split yoke 91 (the circumferential direction of the yoke 81). In other words, the split yoke 91 extends from the base end portion of the protruding portion 92 to both sides in the circumferential direction.

As shown in fig. 2, the split core 90 is a laminated body in which core pieces 94 are laminated in the direction of the center axis CL of the split yoke 91 (the center axis CL of the yoke 81). When the split core 90 formed by laminating the core pieces 94 is combined, the motor core 80 is formed. Motor core 80 may also be referred to as a laminated body. The core pieces 94 are bonded together by staking, welding, etc.

(laminate manufacturing System)

The laminated body manufacturing system 1 shown in fig. 3 is a system for manufacturing a motor core 80 (an example of a laminated body). The laminate manufacturing system 1 includes: a lamination unit 2; a heat treatment unit 3 and a tool 100.

(laminated Unit)

The stacking unit 2 includes: a lamination device 10 that forms a split core 90; and a filling area a1 configured to place the split core 90 formed by the laminating apparatus 10 in the tool 100. As shown in fig. 4, the laminating apparatus 10 includes: a blanking die 11; a column 12; a discharge section 13; and a pusher 14.

The blanking die 11 blanks the core pieces 94 from the electromagnetic steel sheet MS, and sequentially laminates the core pieces 94 to form the split core 90. For example, the blanking die 11 includes: a die 15 and a punch 16.

The mold 15 includes: a support surface 15a that supports the electromagnetic steel sheet MS; and a receiving hole 15b opened on the support surface 15 a. The receiving hole 15b receives the core piece 94 punched out of the electromagnetic steel sheet MS.

The ram 16 is driven up and down, for example by a hydraulic press (not shown). The punch 16 punches out the core piece 94 from the electromagnetic steel sheet MS, and presses the core piece 94 into the accommodation hole 15 b. Further, the punch 16 joins the core piece 94 accommodated in the accommodation hole 15b and the newly punched core piece 94 by caulking or the like. In this manner, the split core 90 is formed by repeatedly blanking and laminating the core pieces 94.

The discharge section 13 is arranged below the blanking die 11. The discharge section 13 is used to discharge the split cores 90 formed by the blanking die 11.

The cylinder 12 is driven by, for example, a linear actuator (not shown), and moves up and down between a first height for supporting the ferrite pieces 94 in the accommodation hole 15b and a second height for discharging the split cores 90 to the discharge section 13. The first height is, for example, a height at which the upper surface of the cylinder 12 is located at the lower surface of the mold 15 (the lower end of the receiving hole 15 b). When the cylinder 12 is located at the first height, the punched core piece 94 is accommodated in a space formed by the upper surface of the cylinder 12 and the accommodating hole 15b of the die 15. The second height is, for example, the height at which the upper surface of the cylinder 12 is flush with the upper surface of the discharge section 13.

The pusher 14 moves the split core 90 from above the cylinder 12 to the discharge section 13 when the cylinder 12 is at the second height.

The configuration of the above-described stacking apparatus 10 is merely an example, and the stacking apparatus 10 may be configured in any manner as long as a stacked body can be formed. For example, the laminating device 10 may not necessarily be configured to laminate and bond the core pieces 94 by the die 15 and the punch 16, and may be configured to laminate and bond the core pieces 94 by a configuration different from the die 15 and the punch 16 after extracting the core pieces 94 from the accommodation hole 15 b.

(Heat treatment Unit)

Returning to fig. 3, the heat treatment unit 3 includes: a heat treatment device 20 for performing heat treatment of the split cores 90; and an extraction zone a2 for extracting the split core 90 from the tool 100 after the heat treatment. The heat treatment apparatus 20 includes: an oil removal furnace 21; an annealing furnace 22; a cooling unit 23; a bluing treatment furnace 24; a cooling unit 25; and a conveyor 30.

The oil removing furnace 21 (heat treatment furnace) is a heating furnace configured to evaporate oil adhering to the split cores 90. The annealing furnace 22 (heat treatment furnace) is a heating furnace configured to anneal the split cores 90. The cooling unit 23 is a unit configured to cool the split core 90 below a temperature suitable for bluing. The bluing furnace 24 (heat treatment furnace) is a heating furnace configured to form an oxide film on the surface of the split core 90. The cooling unit 25 is a unit configured to cool the split core 90 to around room temperature. The bluing treatment is a surface treatment that imparts corrosion resistance to the laminate, and in this example, water vapor is applied to the surface of the laminate to form black rust (Fe)₃O₄)。

The conveyor 30 moves the tool 100 along a conveying path that sequentially passes through the oil removal furnace 21, the annealing furnace 22, the cooling unit 23, the bluing treatment furnace 24, and the cooling unit 25. For example, the conveyor 30 includes: a circulating body 33 such as a loop chain; and a driving pulley 31 and a driven pulley 32 for circulating and driving the circulating body 33. After moving along the conveying path, the respective units of the circulating body 33 return to the starting positions of the conveying path.

The configuration of the heat treatment apparatus 20 described above is merely an example, and the heat treatment apparatus 20 may be configured in any manner as long as the heat treatment of the stacked body is performed. For example, the heat treatment apparatus 20 may not include any one of the oil removal furnace 21, the annealing furnace 22, and the bluing furnace 24.

(tool)

As shown in fig. 5, the tool 100 includes: a first tool 110 (an example of a first member) that holds the split cores 90; a second tool 120 (an example of a second member) that supports the first tool 110; a third tool 130 that holds the split core 90 from above; and a fourth tool 140 holding the third tool 130 above the second tool 120.

The first tool 110 includes: a plate 111; a holding portion 112; and a projection 113. The plate 111 supports at least one split core 90. The plate 111 may also support a plurality of split cores 90. The plate 111 may support a plurality of split cores 90 stacked in the vertical direction. The plate 111 has a circular, oval or polygonal shape and has a width facing the entire lower surface of the split core 90 disposed at the lowermost layer.

Hereinafter, "up and down" in the description of the first tool 110 refers to up and down in a state where the plate 111 supports the plurality of split cores 90. As described below, each of the plurality of split cores 90 stacked on the plate 111 is placed in such a manner that the core pieces 94 extend along the plate 111. Hereinafter, description will be made on the assumption of such an arrangement.

The holding portion 112 holds the plurality of split cores 90 supported by the plate 111 from the outer peripheral side. Here, the term "hold" means to maintain the stacked state of the plurality of split cores 90 and to restrain the plurality of split cores 90 on the plate 111. Holding from the outer peripheral side means holding by a member located outside the outer edge of the split core 90. The holding part 112 may be configured to confine the entire lower surface of the split core 90 disposed at the lowermost layer inside the outer edge of the plate 111.

For example, the holding portion 112 includes a plurality of holding pins that protrude upward from the plate 111 and surround the plurality of split cores 90. The holding portion 112 may include three or more holding pins. As an example, the holding portion 112 includes three holding

pins

112A, 112B, and 112C.

As shown in fig. 5 and 6, the holding

pins

112A and 112B sandwich the projecting portion 92 between the split yoke 91 and the flange portion 93. Accordingly, the movement of the split core 90 is restricted in the direction in which the holding pins 112A and 112B are arranged (hereinafter referred to as "first direction"). The holding pin 112C is located between the holding

pins

112A and 112B in the first direction, and is positioned in such a manner as to sandwich the split yoke 91 between the holding

pins

112A and 112B. Accordingly, the movement of the split core 90 is also restricted in a direction orthogonal to the first direction (hereinafter referred to as "second direction").

As shown in fig. 7(a), the holding pin 112C may be placed so as to sandwich the flange portion 93 between the holding

pins

112A and 112B. Accordingly, the movement of the split core 90 is also restricted in the second direction.

As shown in fig. 7(b), the holding pin 112C may also be omitted. In the illustrated example, the holding portion 112 has the following configuration: the retaining

pins

112A and 112B abut against the split yoke 91, and the retaining pins 112A and 112B abut against the flange portion 93. Specifically, in the illustrated example, the retaining pins 112A and 11B are thickened. In this way, the movement of the split cores 90 in the second direction can still be restricted by the holding portions 112.

Further, as shown in fig. 7(c), the movement of the split core 90 may also be restricted by fitting the outer peripheral surface of the holding pin into the recess of the outer shape of the split core 90. The holding portion 112 of fig. 7(C) includes holding

pins

112C and 112D that sandwich the split core 90 in the second direction. A V-shaped recess 95 is formed on the outer peripheral surface of the split yoke 91, and a retaining pin 112C is fitted into the recess 95. The distal end face of the protruding portion 92 is curved in a concave shape, thereby forming the concave portion 96, and the retaining pin 112D is fitted into the concave portion 96. The retaining pin 112C is fitted into the recess 95, and the retaining pin 112D is fitted into the recess 96, so that the movement of the split core 90 is restricted in the first direction. For this reason, according to the configuration of fig. 7(c), the holding

pins

112A and 112B can be omitted.

Further, the holding part 112 may not necessarily be configured to restrict the movement of the split cores 90 by a plurality of holding pins. For example, the holding portion 112 may include a wall portion that protrudes upward from the plate 111 and surrounds the plurality of split cores 90. The wall portion may have a mesh shape.

As shown in fig. 8, the lower end portions of the holding pins 112A, 112B, and 112C are inserted into connection holes 111a, 111B, and 111C formed in the plate 111, respectively, and are welded to the plate 111 at the lower portion of the plate 111. As shown in this example, the first tool 110 may further include a bonding portion 114 that bonds the plate 111 with the retention pins 112A, 112B, and 112C below the support surface of the plate 111 that supports the stack. The bonding portion 114 is, for example, a weld bead.

The joining method of the holding pins 112A, 112B, 112C and the plate 111 is not necessarily limited to welding. For example, the lower end portions of the retaining pins 112A, 112B, and 112C may be press-fitted into the connection holes 111a, 111B, and 111C. Male threads formed at the lower end portions of the holding pins 112A, 112B, and 112C may be screwed into female threads formed in the connection holes 111a, 111B, and 111C, respectively. Further, the holding pins 112A, 112B, and 112C may be formed integrally with the plate 111.

Referring back to fig. 5, the projection 113 projects downward from the plate 111. The protrusion 113 is inserted into a positioning hole (described later) of the second tool 120. The second tool 120 includes: a placement surface on which a plurality of first tools 110 can be placed side by side; and a plurality of positioning holes opened on the placement surface. The positioning hole is a hole into which the protrusion 113 can be inserted. The second tool 120 may further comprise a plurality of vent holes open to the surface on the placement surface and the opposite side of the placement surface.

As an example, the second tool 120 comprises a plate-like tray 121. The tray 121 includes: a rectangular placement surface 121a on which a plurality of first tools 110 can be placed side by side; a plurality of through holes 121 b; a plurality of through holes 121 c; and four through holes 121 d. All the through

holes

121b, 121c, and 121d are opened in the placing face 121 a.

The plurality of through holes 121b are arranged in a matrix along the long side direction and the short side direction of the placement surface 121 a. The through hole 121b is, for example, circular, and its inner surface is fitted to the protrusion 113. Among the plurality of through holes 121b, the hole into which the protruding portion 113 is inserted serves as the above-described positioning hole. Among the plurality of through holes 121b, a hole into which the protrusion 113 is not inserted serves as the above-described ventilation hole.

The plurality of through holes 121c and the through holes 121b are alternately arranged in both the long side direction and the short side direction of the placement surface 121 a. The through-holes 121c have a different shape (e.g., a cross shape) from the through-holes 121b, and all of the through-holes 121c function as the above-described ventilation holes.

The four through holes 121d are located at four corners of the placement surface 121 a. The through hole 121d is used for connection with a fourth tool 140 described below.

Here, as shown in fig. 6, the plurality of through holes 121b are positioned such that: even in the most densely placed state where the first tool 110 is placed on the placing face 121a, when the placing face 121a is viewed from above, an opening area R1 that does not cover the placing face 121a is formed between the adjacent plates 111.

The most densely placed refers to the following states: the maximum number of first tools 110 are placed on the placing face 121a under the condition that the protrusions 113 of the first tools 110 are inserted into the through holes 121b and the adjacent plates 111 do not overlap each other. For example, when the plurality of first tools 110 are placed on the placing face 121a in the most densely placed state, the second tool 120 is configured such that the plurality of first tools 110 are arranged in a polygon (e.g., a quadrangle or a triangle), and the open region R1 is formed between the plurality of plates 111 forming the top of the polygon. At least a part of the plurality of vent holes (the through-holes 121c and the through-holes 121b into which no protrusion is inserted) is positioned such that the opening area R1 is opened in a state where the first tool 110 is placed on the placing face 121a with the closest placement.

For example, when the diameter of the circular plate 111 is referred to as D and the distance between the adjacent through holes 121b is referred to as D, the plurality of through holes 121b are provided on the placing face 121a in such a manner that 2D > D.

In fig. 6, a plurality of first tools 110 are placed in a quadrangular lattice shape, and opening areas R1 are formed between four plates 111 forming four corners. In the region R1, one through hole 121b is fully opened, and four through holes 121b and four through holes 121c are partially opened.

Referring to fig. 5, the third tool 130 holds the split core 90 supported by the first tool 110 from above. The third tool 130 comprises: a pressing surface facing the split cores 90 in the uppermost layer of each first tool 110; and a plurality of holding holes that open in the pressing surface. The plurality of retaining holes receive the upper end portions of the retaining pins 112A, 112B, and 112C.

As an example, the third tool 130 comprises a plate-shaped cover 131. The cover 131 includes: a rectangular pressing surface 131a facing the placement surface 121 a; a plurality of through holes 131 b; and a fourth through hole 131 c. All the through

holes

131b and 131c are opened in the pressing face 131 a.

The plurality of through holes 131b function as the above-described holding holes. For example, a plurality of through holes 131B are provided at positions corresponding to all the retaining pins 112A, 112B, and 112C, respectively. The plurality of through-holes 131b may be placed in any manner as long as the plurality of through-holes 131b can function as holding holes. For example, each through hole 131B may be configured to enable insertion of the upper end portions of the plurality of retaining

pins

112A, 112B, and 112C. For example, a plurality of through holes 131B may be provided at positions corresponding to all the first tools 110, and the through holes 131B may have a shape and a size capable of inserting the three holding

pins

112A, 112B, and 112C.

The fourth tool 140 includes: four pillars 141 located at four corners of the placing surface 121a and the pressing surface 131 a; and four bushings 142 mounted on the outer circumferences of the four posts 141, respectively. At each corner, the post 141 is inserted into the through hole 121d and the through hole 131 c. The lower end of the sleeve 142 contacts the placing face 121a, and the upper end of the sleeve 142 contacts the pressing face 131 a. Accordingly, the third tool 130 is held on the second tool 120.

The configuration of the tool 100 described above is merely an example, and the tool 100 may be configured in any manner as long as the first tool 110 and the second tool 120 are included. For example, the tool 100 may further include a wall surrounding the space between the second tool 120 and the third tool 130, and the wall may be secured to the sleeve 142 of the fourth tool 140. The tool 100 may not include the third tool 130 and the fourth tool 140.

(method of producing laminate)

Next, a manufacturing process of the split core 90 will be described as an example of a manufacturing method of the laminated body. The manufacturing process comprises the following steps: stacking a plurality of split cores 90 on a plate 111 while holding the split cores 90 from the outer peripheral side by a holding portion 112; placing the first tool 110 holding the plurality of split cores 90 on the placing face 121a, and inserting the protruding portion 113 into the through-hole 121 b; and the plurality of split cores 90 held by the first tool 110 are placed in the heat treatment apparatus 20 together with the first tool 110 and the second tool 120.

The manufacturing process may further include: the split cores 90 are formed using the stacking apparatus 10, and the split cores 90 are conveyed from the stacking apparatus 10 side to the heat treatment apparatus 20 side. The lamination of the plurality of split cores 90 on the plate 111 may be performed before the plurality of split cores 90 are conveyed from the laminating apparatus 10 side to the heat treatment apparatus 20 side, and the plurality of split cores 90 may be conveyed from the laminating apparatus 10 side to the heat treatment apparatus 20 side together with the first tool 110.

The placement of the first tool 110 holding the plurality of split cores 90 on the placement surface 121a and the insertion of the protruding portion 113 into the through hole 121b may also be performed before the plurality of split cores 90 are conveyed from the stacking apparatus 10 side to the heat treatment apparatus 20 side, and the plurality of split cores 90 may be conveyed from the stacking apparatus 10 side to the heat treatment apparatus 20 side together with the first tool 110 and the second tool 120.

The process of manufacturing the split core 90 will be described in more detail below. First, as shown in fig. 9, the split core 90 is formed using the lamination device 10. For example, in a state where the column 12 is located at the first height (height where the upper surface of the column 12 is located on the lower surface of the die 15), the core pieces 94 are repeatedly blanked out of the electromagnetic steel sheet MS with the punch 16 to form the split cores 90 in the accommodation holes 15 b.

Next, as shown in fig. 10, the cylinder 12 is lowered to the second height (height at which the upper surface of the cylinder 12 is flush with the upper surface of the discharge section 13), and the split cores 90 are pushed from the cylinder 12 to the discharge section 13 by the pusher 14.

Next, as shown in fig. 11, in a state where the core pieces 94 are arranged along the plate 111, the split cores 90 are placed on the plate 111 while holding the split cores 90 from the outer peripheral side by the holding part 112. Thereafter, the placement of the split cores 90 on the board 111 is repeated, and a plurality of the split cores 90 are laminated on the board 111.

The placement of the split core 90 onto the plate 111 may be performed manually in the filling area a1 or may be performed automatically in the laminating apparatus 10. When the placement of the split cores 90 onto the board 111 is automatically performed, the stacking apparatus 10 may further include: a discharge hole 17 configured to discharge the split core 90; and a holder 18 configured to hold the first tool 110 below the discharge hole 17, as shown in fig. 12. The discharge openings 17 are provided, for example, in the discharge section 13.

When a predetermined number of split cores 90 are placed on the first tool 110, as shown in fig. 13, the first tool 110 is placed on the tray 121 of the second tool 120 in the filling area a 1. Specifically, the first tool 110 is placed on the placing face 121a, and the protruding portion 113 is inserted into the through hole 121 b. After that, the formation and ejection of the split cores 90, the placement on the plate 111, and the placement of the first tool 110 on the placement surface 121a are repeated.

When a predetermined number of the first tools 110 are placed on the placing surface 121a, the third tools 130 are covered, as shown in fig. 14. Specifically, the third tool 130 is placed such that the pressing surface 131a faces the split cores 90 in the uppermost layer of each first tool 110, and the upper end portions of all the holding pins 112A, 112B, and 112C enter the through holes 131B, and the third tool 130 is held on the second tool 120 by the fourth tool 140.

Next, as shown in fig. 15, the plurality of split cores 90 placed on the tool 100 are conveyed from the laminating apparatus 10 side to the heat treatment apparatus 20 side together with the first tool 110, the second tool 120, the third tool 130, and the fourth tool 140. The conveying may be performed using a conveyor or a conveyor car, or may be performed using a vehicle such as a truck.

Next, as shown in fig. 16, the third tool 130 and the fourth tool 140 are extracted from the second tool 120, and the plurality of split cores 90 are placed in the heat treatment apparatus 20 together with the first tool 110 and the second tool 120. The plurality of split cores 90 are sequentially conveyed to the oil removing furnace 21, the annealing furnace 22, the cooling unit 23, the bluing furnace 24, and the cooling unit 25 by the conveyor 30 together with the first tool 110 and the second tool 120, and are subjected to heat treatment. Thereafter, the heat-treated split cores 90 are extracted from the first tool 110 and the second tool 120 at the extraction area a 2.

The second tool 120 holding the plurality of split cores 90 may be stacked in multiple stages and placed in the heat treatment apparatus 20. In this case, the fourth tool 140 may be used to connect with the superior second tool 120 without being extracted from the second tool 120.

Next, as shown in fig. 17, the tool 100 for extracting the split cores 90 is transported from the heat treatment apparatus 20 side to the laminating apparatus 10 side. For this conveyance, the same conveyance method as that of the tool 100 from the laminating apparatus 10 side to the heat treatment apparatus 20 side may be used. Thus, the manufacturing process of the split core 90 is completed. When the tool 100 is returned to the stacked device 10 side, the third tool 130 and the fourth tool 140 extracted from the second tool 120 before the heat treatment may be attached to the second tool 120 again, or the first tool 110 and the second tool 120 may be returned to the stacked device 10 side without attaching the third tool 130 and the fourth tool 140. Instead of extracting the third tool 130 and the fourth tool 140 from the second tool 120, other third tool 130 and fourth tool 140 having low oil adhesion may be prepared, attached to the second tool 120, and returned to the laminating apparatus 10 side.

The manufacturing process may be appropriately modified as long as the plurality of split cores 90 held by the first tool 110 are placed in the heat treatment apparatus 20 together with the first tool 110 and the second tool 120.

For example, the stacking of the plurality of split cores 90 on the plate 111 and the placement of the first tool holding the plurality of split cores 90 on the placement surface 121a may be performed after the plurality of split cores 90 are conveyed from the stacking apparatus 10 side to the heat treatment apparatus 20 side. In this case, a tool other than the first tool 110 and the second tool 120 is required to convey the split cores 90 from the laminating apparatus 10 side to the heat treatment apparatus 20 side.

The lamination of the plurality of split cores 90 on the plate 111 may be performed before the plurality of split cores 90 are conveyed from the laminating apparatus 10 side to the heat treatment apparatus 20 side, and the placement of the first tool 110 holding the plurality of split cores 90 on the placement surface 121a may be performed after the conveyance. In this case, a tool other than the second tool 120 is required to convey the split cores 90 from the laminating apparatus 10 side to the heat treatment apparatus 20 side.

When the split cores 90 are not conveyed from the stacking apparatus 10 side to the heat treatment apparatus 20 side using the second tool 120, the second tool 120 can be mounted on the heat treatment apparatus 20 side, so that the function of the second tool 120 can be incorporated into the conveyor 30. Specifically, positioning holes, ventilation holes, and the like may be formed in the circulation body 33 of the conveyor 30, and the circulation body 33 may be used as a second tool.

(Effect of the embodiment)

As described above, the tool 100 includes: a first tool 110 configured to hold a stack; and a second tool 120 configured to support the first tool 110. The second tool 120 includes: a placement surface 121a on which a plurality of first tools 110 can be placed side by side; and a plurality of positioning holes (through holes 121b) that open on the placement surface 121 a. The first tool 110 includes: a plate 111 configured to support the laminate; a holding portion 112 configured to hold the stacked body supported by the plate 111 from an outer peripheral side; and a protrusion 113 protruding downward from the plate 111 and inserted into the positioning hole of the second tool 120.

According to the tool 100, since the first tools 110 holding the stacked bodies are arranged side by side on the placement face 121a, a large number of stacked bodies can be subjected to the heat treatment together. Therefore, the production efficiency of the laminate can be improved.

The stacked body on the plate 111 is held by the holding portion 112. Therefore, when the first tool 110 is placed on the second tool 120 and when the tool 100 is placed in the heat treatment apparatus 20, the displacement of the stacked body is reduced. By fitting the protrusion 113 of the first tool 110 into the positioning hole of the second tool 120, the displacement of the first tool 110 relative to the second tool 120 can also be reduced. For this reason, the variation in the heat treatment state caused by the uneven distribution of the split cores 90 in the tool 100 is reduced. Therefore, the quality of the laminate can be improved.

It is also possible to stack a plurality of stacked bodies on the plate 111 within a height range that the holding portion 112 can hold. In this case, since a plurality of stacked bodies can be placed together on the second tool 120, more stacked bodies can be efficiently subjected to the heat treatment together. When a plurality of laminated bodies are laminated on the plate 111, the laminated bodies are held together by the holding section 112, thereby also reducing the occurrence of defects associated with the collapse of the plurality of laminated bodies. Since the stress concentration in each laminated body is reduced by reducing the displacement between the overlapped laminated bodies, the occurrence of defects such as sticking (electrical conduction between the iron core pieces 94) caused by the stress concentration is reduced.

In this manner, the tool 100 is effective in improving the production efficiency and quality of the electromagnetic steel sheet laminate. Since the holding portion 112 is configured to hold the stacked body from the outer peripheral side, the stacked body can be held on the plate 111 even when there is no hole for positioning. Therefore, the present invention is particularly effective in manufacturing the split core 90 divided from the ring core in the circumferential direction.

The second tool 120 further includes a plurality of vent holes (through-holes 121b and through-holes 121c) that open on the placement surface 121 a. The plurality of positioning holes are positioned such that even in a state where the first tool 110 is placed on the placing face 121a with the closest placement, an opening area R1 is formed between the adjacent plates 111 that does not cover the placing face 121 a. At least a part of the plurality of ventilation holes may be opened in the opening region R1.

During the heat treatment, it is desirable that all of the plurality of laminated bodies held by the tool 100 be maintained at a uniform temperature for uniform heat treatment. Since the second tool 120 is provided with the plurality of vent holes 121b and 121c, convection in the heat treatment apparatus can be promoted, and also high-temperature gas can be guided to the stacked body provided inside the tool 100. This makes it possible to easily maintain all of the plurality of laminated bodies held by the tool 100 at a uniform temperature. In the bluing treatment, water vapor adheres to the laminate. In the bluing process, water vapor can adhere to the stacked body provided inside the tool 100 through the vent holes 121b and 121c, and uniform bluing can be performed for a plurality of stacked bodies.

The holding part 112 may include a plurality of holding pins protruding upward from the plate 111. The heat capacity of the holding portion 112 can be reduced, and the influence of the holding portion 112 on the heat treatment state can be reduced. Preferably, the retaining pin projects upwardly from the plate 111 and limits lateral displacement of the stack. Preferably, the holding pin contacts a side edge of the laminated body to restrict lateral displacement of the laminated body.

When the heat treatment is performed, the plate is heated to a high temperature. The edge portion of the core piece 94 having a high temperature may be deformed to droop due to gravity. However, according to the above-described manufacturing method, when the laminated body is formed by laminating a plurality of core pieces 94 (examples of plate materials), the core pieces 94 having the same shape are laminated while restricting the lateral movement of the core pieces 94 with the holding portion 112. Since the entire lower surface of the ferrite sheet 94 is supported by the upper surface of the ferrite sheet 94 located below, the ferrite sheet 94 is difficult to deform during heat treatment. This enables the laminate to be formed with high shape accuracy. The plate 111 is larger than the lamination sheets 94 so that the entire lower surface of the lowermost lamination sheet 94 is supported by the upper surface of the plate 111. As long as the core pieces 94 have the same shape, core pieces 94 having different thicknesses may be stacked. For example, the first tool 110 may be used to stack a split core in which four core pieces each having a thickness of 0.5mm are stacked on another split core in which five core pieces each having a thickness of 0.3mm are stacked.

The first tool 110 may also include a bonding portion 114 that bonds the plate 111 to the holding portion 112 below the support surface of the plate 111 that supports the stack. In this case, by placing the joining portion 114 below the supporting surface of the plate 111, the smoothness of the supporting surface of the plate 111 can be improved, and the concentration of pressure in each laminated body on the plate 111 can be further reduced.

The width of the plate 111 may be such that it faces the entire lower surface of the split core 90 placed at the lowermost layer. In this case, by supporting the split cores 90 with a wider surface, the stress concentration can be reduced more reliably.

The tool 100 may further comprise a third tool 130 for holding the stack supported by the first tool 110 from above. The third tool 130 includes: a pressing surface 131a facing the split core 90 at the uppermost layer of each first tool 110; and a plurality of holding holes (through holes 131B) that are opened in the pressing surface 131a and receive upper end portions of the holding pins 112A, 112B, and 112C. In this case, the laminate can be protected more reliably. In addition to fitting the protruding portion 113 of the first tool 110 into the positioning hole of the second tool 120, fitting the upper end portions of the holding pins 112A, 112B, and 112C into the holding holes makes it possible to more reliably reduce displacement, including inclination, of the first tool 110 relative to the placement surface 121 a.

When the tool 100 is loaded into the heat treatment apparatus, longitudinal vibration acts on the stacked body in addition to lateral vibration. The holding portion 112 can reduce the lateral vibration of the core sheet 94 and the laminated body. The third tool 130 can prevent the iron core piece 94 and the stacked body from coming off upward from the holding portion 112.

The tool 100 may also include a fourth tool 140 that holds the third tool 130 on the second tool 120. In this case, the inclination of the first tool 110 with respect to the placement surface 121a can be reduced more reliably.

In the manufacturing process of the laminated body using the tool 100, the lamination of the plurality of laminated bodies on the plate 111 may be performed before the plurality of laminated bodies are conveyed from the laminating apparatus 10 side to the heat treatment apparatus 20 side, and the plurality of laminated bodies may be conveyed from the laminating apparatus 10 side to the heat treatment apparatus 20 side together with the first tool 110. In this case, the number of tools for manufacturing the stacked body can be reduced by using the first tool 110 when transporting the stacked body. The time and effort to refill the tool 100 with stacks from the tool used to transport the stacks can be reduced. Since oil and the like adhering to the first tool 110 are removed at the time of the heat treatment, the time and the amount of work for cleaning the tool for conveying the stacked body can be reduced. Therefore, the efficiency of manufacturing the laminate can be further improved.

The placement of the first tool 110 holding the plurality of stacked bodies on the placement surface 121a and the insertion of the protruding portion 113 into the positioning hole of the second tool 120 may also be performed before the plurality of stacked bodies are conveyed from the stacking apparatus 10 side to the heat treatment apparatus 20 side, and the plurality of stacked bodies may be conveyed from the stacking apparatus 10 side to the heat treatment apparatus 20 side together with the first tool 110 and the second tool 120. In this case, by using both the first tool 110 and the second tool 120 when conveying the stacked body, the number of tools for manufacturing the stacked body can be further reduced. The time and effort for refilling the tool 100 with stacks from the tool for transporting stacks can be further reduced. Therefore, the efficiency of manufacturing the laminate can be further improved.

Although the embodiments are described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the spirit of the present invention. The laminate manufacturing system 1 can be used to manufacture any object as long as the object is a laminate of electromagnetic steel sheets. For example, the laminated body manufacturing system 1 can be used to manufacture an annular motor core 80 that cannot be divided into a plurality of split cores 90, and can also be used to manufacture a rotor core in addition to a stator core.

The present application is based on japanese patent application No.2017-104873, filed on 26.5.2017, the contents of which are incorporated herein by reference.

Claims

1. A tool, comprising:

a first member configured to hold a stacked body of electromagnetic steel plates; and

a second member configured to support the first member,

wherein the second component comprises: a placement surface on which a plurality of the first members can be placed side by side; and a plurality of positioning holes that open in the placement surface,

the first component includes: a plate configured to support the stacked body; a holding section configured to hold the stacked body supported by the plates from an outer peripheral side of the stacked body; and a protrusion protruding downward from the plate and inserted into the positioning hole, and

the second part further comprises a plurality of ventilation holes opening in the placement surface,

the plurality of positioning holes are positioned so that an opening area that does not cover the placement surface is formed between the adjacent plates even in a state where the first member is placed on the placement surface with the closest placement,

Wherein at least a part of the plurality of ventilation holes is opened in the opening area.

2. The tool of claim 1, wherein the retaining portion comprises a plurality of retaining pins projecting upwardly from the plate and configured to limit lateral displacement of the stack.

3. The tool of claim 2, wherein the retention pin contacts a side edge of the laminate to limit lateral displacement of the laminate.

4. The tool of claim 2, wherein the first component further comprises a bonding portion configured to bond the plate with the retaining pin below a support surface of the plate that supports the stack.

5. A method of manufacturing a laminate, comprising:

holding a stacked body of electromagnetic steel sheets by a holding portion provided on a plate from an outer peripheral side thereof and placing the stacked body on the plate using a first member including the plate, the holding portion, and a protruding portion protruding downward from the plate;

Placing the laminated body held by the first member in a heat treatment apparatus together with the first member and the second member,

wherein the second component further comprises a plurality of ventilation holes that open in the placement face,

the plurality of positioning holes are positioned so that an opening area not covering the placement surface is formed between the adjacent plates even in a state where the first member is placed on the placement surface with the closest placement,

6. The method for manufacturing a laminate according to claim 5, further comprising:

forming the laminated body by using a laminating apparatus; and

transporting the laminated body from the laminating apparatus side to the heat treatment apparatus side,

wherein the placing of the stacked body on the plate is performed before the stacked body is conveyed from the stacking apparatus side to the heat treatment apparatus side, and the stacked body is conveyed from the stacking apparatus side to the heat treatment apparatus side together with the first member.

7. The method of manufacturing a laminated body according to claim 6, wherein placing the first member holding the laminated body on the placing face and inserting the protruding portion into the positioning hole are further performed before conveying the laminated body from the laminating apparatus side to the heat treatment apparatus side, and the laminated body is conveyed from the laminating apparatus side to the heat treatment apparatus side together with the first member and the second member.

8. The method for manufacturing the laminated body according to claim 6, wherein when the laminated body is formed by laminating a plurality of plate materials, plate materials having the same shape are laminated while restricting lateral movement of the plate materials by the holding portion.