KR20140043286A - Manufacturing method and manufacturing apparatus for layered iron core - Google Patents

Abstract

Stable caulking combination can be performed while preventing transformation of a metal pin thin plate even if a plurality of magnet installation holes are connected to a central opening of the thin plate. A method for manufacturing a laminating metal pin includes a magnet installation hole forming step of forming a magnet installation hole (h1) placed around the metal pin thin plate (2), a caulking forming step of forming an outer caulking protrusion (m2) and an outer caulking measuring hole (m1) on the thin plate after or before the magnet installation hole forming step, a push-back step of pushing back a central opening area (h3) connected inside (h1a) of each magnet installation hole after blanking or half blanking it, an appearance blanking step of blanking the appearance (h4) of the metal pin thin plate (h4), and a laminating step of forming a laminating body (3) by performing caulking combination to the metal pin thin plate. [Reference numerals] (1) Pilot hole; (2) Magnet installation hole; (3) Internal caulking hole; (4) External caulking hole; (5) Central hole; (6) Half-blanking of a central opening area; (7) Blanking of an external diameter; (8) Lamination; (AA) Internal caulking protrusion; (BB) External caulking protrusion; (CC) Push back

Description

Manufacturing method and manufacturing apparatus for layered iron core

The present invention relates to a method for producing a laminated iron core formed by laminating a plurality of iron core thin plates and an apparatus for producing a laminated iron core.

As a conventional permanent magnet field type electric motor, a plurality of permanent magnets are disposed in the iron core of the rotor. As such a rotor, it is comprised by the laminated iron core which laminated | stacked several iron core thin plates, for example, and each iron core thin plate is arrange | positioned several magnet mounting holes around the center opening, and the internal combustion of each magnetic mounting hole is carried out. It is known that while connecting to this center opening (inner hole), the outer periphery side extends to the vicinity of an outer periphery (refer patent document 1, 2).

Patent Document 1: Japanese Patent Application Laid-Open No. 2008-263772 Patent Document 2: Japanese Utility Model Utility Model Publication No. Hei 2-44850

By the way, in manufacture of a laminated iron core, after the punching process, such as a pilot hole and a magnet mounting hole, is performed sequentially about the hoop material which is intermittently conveyed, for example in a sequential conveying mold apparatus, the external shape of an iron core thin plate is punched, and The iron core thin plates are integrated by a predetermined number of pieces by caulking and being laminated in a squeeze ring.

However, in the prior art as disclosed in Patent Literatures 1 and 2, since the iron core sheet having the center opening and the magnet mounting hole connected thereto is easily deformed due to the decrease in rigidity, sufficient side pressure by the squeeze ring in the lamination step. There was a problem that stable caulking coupling could not be performed without this function.

The present invention has been devised in view of the above-described problems of the prior art, and a laminated iron core which makes it possible to perform a stable caulking coupling while preventing deformation of the iron core sheet even when a plurality of punched holes connected to the central opening of the iron core sheet are formed. It is a main object to provide a manufacturing method and a laminated iron core manufacturing apparatus.

In the 1st aspect of this invention, as a manufacturing method of the laminated iron core 1 formed by punching out the iron core thin plate 2 from the strip | belt-shaped thin steel plate W conveyed intermittently, and laminating | stacking multiple iron core thin plates, The said A punching hole forming step of forming a plurality of punching holes h1 disposed in the circumferential direction of the iron core sheet, and a caulking forming step of forming the caulking coupling portions m1 and m2 in the iron core sheet before or after the punching hole forming step. And a pushback process for pushing back after punching or half-blanking the central opening region h3 to which the inner edge h1a of each punching hole is connected, and the outer shape h4 of the iron core sheet. And a lamination step of forming the laminate 3 by caulking the iron core thin plate.

In the manufacturing method of the laminated iron core which concerns on this 1st side surface, since the center opening area which the internal edge of each punching hole connects was made to punch or after punching out, the multiple punching hole which connects to a center opening (magnet mounting) Also in the case of forming a ball, etc., it is possible to suppress the deterioration of the rigidity of the iron core thin plate in the lamination step and to perform stable caulking bonding while preventing the deformation of the iron core thin plate.

In the second aspect of the present invention, with respect to the first aspect, the central opening region has a dovetail groove-shaped recess 5 formed in the region between the punching holes adjacent to each other.

In the manufacturing method of the laminated iron core according to this second aspect, the portion of the central opening region can be easily removed from the laminate after lamination of the iron core thin plate while preventing the separation of the central opening region after the pushback process.

In the third aspect of the present invention, with respect to the first or second aspect, a separation hole 7 is formed in the center opening region in an area between the punching holes adjacent to each other.

In the method for manufacturing a laminated iron core according to the third aspect, the separation hole is deformed when the portion of the central opening region is removed from the laminate to easily separate the portion of the central opening region from the latching portion of the iron core sheet. It becomes possible.

In the fourth aspect of the present invention, in any one of the first to third aspects, the iron core sheet includes a first outer peripheral portion 41 that defines an outer edge of the punching hole, and a first outer circumference thereof. It is characterized by having a 2nd outer peripheral part 42 which has a site | part larger than a edge part.

In the method for producing a laminated iron core according to the fourth aspect, the side pressure can be prevented from acting on the first outer periphery that defines the outer edge of the punched hole during caulking engagement in the lamination step, and the first outer periphery having a relatively low rigidity can be prevented. The deformation of the edges can be prevented.

In the fifth aspect of the present invention, with respect to the fourth aspect, the iron core sheet is rotationally symmetrical with respect to the center thereof, and the second outer periphery is convex in the radially outer side.

In the manufacturing method of the laminated iron core which concerns on this 5th side surface, caulking coupling | bonding in a lamination process can be performed stably, preventing the deformation | transformation of the 1st outer peripheral part with comparatively rigidity.

In the sixth aspect of the present invention, in regard to any one of the first to third aspects, an outer shape of the iron core sheet is circular.

In the manufacturing method of the laminated iron core which concerns on this 6th side surface, caulking coupling | bonding can be performed stably by the lamination process similar to the laminated iron core which has a conventional circular outline.

In the seventh aspect of the present invention, there is provided a manufacturing apparatus for producing a laminated iron core formed by punching iron core thin plates from an intermittently conveyed strip-shaped steel sheet and laminating a plurality of the iron core thin plates, wherein Punching or semi-punching the punching hole forming portion for forming the hole, the caulking forming portion for forming a caulking coupling portion in the iron core sheet before or after the punching hole forming process, and the central opening region to which the inner edge of each punching hole is connected It is characterized in that it has a push-back portion for pushing back, an outer punching portion for punching the outer shape of the iron core thin plate, and a laminating portion for coking the iron core thin plate to form a laminate.

As described above, according to the present invention, even when a plurality of punched holes connected to the central opening of the iron core sheet are formed, an excellent effect of enabling stable caulking engagement while preventing deformation of the iron core sheet is obtained.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the strip layout to which the manufacturing method of the laminated iron core which concerns on embodiment is applied.
FIG. 2 is an enlarged view of the iron core sheet punched out in the process 7 shown in FIG.
3 is an explanatory diagram showing a step of separating an unnecessary part in a laminate.
4 is a schematic configuration diagram of a sequential transfer mold apparatus according to an embodiment.
5 is a plan view of an iron core sheet according to a first modification of the method for producing a laminated iron core.
6 is a plan view of (A) an iron core sheet according to a second modification of the method for producing a laminated iron core, and (B) a side view of the laminated iron core.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a strip layout to which a method for manufacturing a laminated iron core according to an embodiment of the present invention is applied, and FIG. 2 is an enlarged view of the iron core thin plate punched out in the step (7) shown in FIG. It is explanatory drawing which shows the removal process of the unnecessary part in a laminated body.

As shown in FIG. 1, the manufacturing process of the laminated iron core 1 (refer FIG. 3) is a (1) pilot hole p performed with respect to the hoop material (strip-shaped thin steel plate) W of an electrical steel sheet. ), (2) Magnet mounting hole (punch hole) (h1) punching process (punch forming process), (3) inner caulking hole (k1) punching, (4) outer caulking hole ( m1) punching and bending of the inner caulking projection k2, (5) punching and punching of the central hole h2 and outer caulking projection m2, (6) center opening area of the iron core sheet 2 h3) Punching or semi-punching and pushback processing (pushback process), (7) Punching of external shape (h4) of iron core thin plate 2 (extrusion punching process), (8) Lamination of iron core thin plate 2 ( It is mainly comprised by each process of lamination process).

In the step (2), a plurality of magnet mounting holes h1 (in this case, six) in which permanent magnets are sandwiched after mounting are respectively formed. Each magnet mounting hole h1 forms a rectangular shape as shown in FIG. 2, and is arrange | positioned at equal intervals in the circumferential direction so that the center hole h2 formed in the later process 4 may be enclosed. The inner edge h1a of each magnet mounting hole h1 is connected to the central opening region h3 of the iron core thin plate 2 formed later, and the outer edge h1b side has an outer shape h4 of the iron core thin plate 2 formed later. ) Extends to the vicinity. In addition, the shape, quantity, and arrangement | positioning of the magnet mounting hole formed in the iron core thin plate 2 are not limited to what is shown here, and various changes are possible.

In the step (3), the inner side caulking measuring hole k1 is formed in the central opening region h3 of the iron core thin plate 2 for measurement (that is, the iron core thin plate located at the lowermost layer of the laminated iron core 1). The inner caulking metering hole k1 is arranged at equal intervals in the circumferential direction so as to surround the central hole h2 in the central opening region h3 formed in the later process 6, as also shown in FIG. 2. On the other hand, the inner side caulking protrusion k2 is formed in the process 4 about the center opening area | region h3 of the iron core thin plate 2 other than measurement. The formation of the caulking projection k2 is performed by setting the press-fit amount of the punch P3 to a predetermined ratio with respect to the plate thickness of the hoop material W (the same applies to the outer caulking projection m2 described later).

In the process (4), the outer side caulking measuring hole m1 with respect to the iron core thin plate 2 for a measurement is formed. The outer caulking metering hole m1 is equally spaced in the circumferential direction so as to surround the central opening area h3 formed in a later step 6 between the adjacent magnet mounting holes h1 as shown in FIG. 2 as well. Is placed. The outer caulking measuring hole m1 is formed every predetermined number of times (for example, 50 times), whereby the number of laminated sheets of the laminated iron core 1 is determined. On the other hand, about the iron core thin plate 2 other than the measurement, the outer side caulking protrusion m2 is formed in process (5).

Moreover, about the said process (2)-(5), it is possible to change a procedure suitably and to implement. In addition, since the center opening area | region h3 turns into an unnecessary part finally, you may abbreviate | omit about formation of the inside caulking metering hole k1 and the caulking protrusion k2 with respect to the center opening area h3.

In the step (6), the center opening region h3 of the iron core thin plate 2 is pushed back after being punched out or half punched according to its appearance. Here, the center opening area | region h3 is half-pulled by setting the indentation amount of the punch P5 to a predetermined ratio with respect to the plate | board thickness of the hoop material W, Then, the half-pushing part is pushed back and the hoop material ( W) is pushed back. Thereby, the center opening area | region h3 fits in the hole of the hoop material W in the state cut | disconnected according to the external shape.

The outer shape of the center opening region h3 forms a substantially hexagonal shape as shown in FIG. 2, at least in which the inner edge h1a of each magnet mounting hole h1 is connected (that is, the center opening region h3 is removed). After that, various changes are possible as long as each magnet mounting hole h1 is integrated with the central opening, and a shape such as a circle may be adopted. In addition, the center opening region h3 has a dovetail groove-shaped concave portion (trapezoidal concave portion) 5 formed in an area between the magnet mounting holes h1 adjacent to each other. The dovetail groove-shaped recess 5 is fitted with the dovetail protrusion-shaped convex portion (trapezoidal convex portion) 6 formed on the outside thereof, whereby the center opening region h3 after the pushback process. After lamination of the iron core thin plate 2 while preventing the separation, the portion of the central opening region h3 can be easily removed from the laminate 3. The dovetail groove-shaped concave portion 5 and the dovetail protrusion-shaped convex portion 6 do not necessarily need to be provided between all adjacent magnet mounting holes h1, and may be omitted as appropriate.

In the step (7), the iron core thin plate (2) is punched out according to the outer shape (h4). Thereby, the iron core thin plate 2 is punched out in the state which hold | maintained the center opening area | region h3 which becomes unnecessary finally, and is laminated | stacked in the state in the process (8). In the process (8), the convex portions of the inner core caulking protrusion (k2) and the outer caulking protrusion (m2) of the punched iron core plate (2) are respectively the inner caulking protrusion (k2) and the outer caulking protrusion (the bottom iron core plate (2)). By being fitted into the recessed portion of m2, the central opening region h3 and its outer region are sequentially caulked. Finally, the iron core thin plates 2 are separated by the iron core thin plates 2 on which the outer caulking measuring holes m1 are formed, and a laminate 3 in which a predetermined number of iron core thin plates 2 are fixed to each other is formed.

In the laminated body 3 obtained by said process (1)-(8), the center opening area | region h3 which is an unnecessary part remains. However, since the center opening area | region h3 is cut | disconnected according to the external shape as mentioned above, when the center opening area | region h3 is pushed in the axial direction using predetermined jig | tool (not shown), etc., As shown in FIG. 3, it can be easily separated from the laminated iron core 1. In this case, since the center opening region h3 is in a laminated state coked with each other, there is an advantage that the operation of removing the center opening region h3 and subsequent handling thereof are easy. In addition, the center hole h2 can be used as a fixing hole (positioning hole) of the separating jig.

In addition, as shown by the dotted line in FIG. 2, in the central opening region h3, the separation hole 7 in the region between the magnet mounting holes h1 adjacent to each other (more specifically, inside the recess 5). It is also possible to configure each provided. Thereby, when removing the center opening area | region h3 from the laminated body 3, the separation hole 7 is deformed and the stress at the time of separation is absorbed, and the part of the center opening area | region h3 and the iron core thin plate 2 are removed. It is possible to easily separate the engaging portions (the fitting portions of the concave portion 5 and the convex portion 6). In addition, although the separation hole 7 was made into the long hole orthogonal to a radial direction, the magnitude | size and shape can be variously changed.

The finally obtained laminated iron core 1 has a structure in which a substantially hexagonal central opening 8 and a plurality of magnet mounting holes h1 extending radially outward from the central opening 8 are formed. The laminated iron core 1 can be used for a rotor of a permanent magnet field rotating electric machine. For example, the central opening 8 has a rotor having the same shape as the central opening region h3 formed of a material different from that of the laminated iron core 1. The shaft holding member can be inserted.

It is a schematic block diagram of the sequential transfer metal mold | die apparatus which uses the manufacturing method of the laminated iron core which concerns on embodiment.

The sequential transfer mold apparatus (laminated iron core manufacturing apparatus) 10 press-processes the hoop material W intermittently conveyed in the apparatus, and punches P1-P7 attached to the upper mold | type 11, and upper mold | type ( Mainly, the dies D6 and D7 (showing only some dies) attached to the lower die 12 corresponding to 11) and the stripper plate 13 for separating the hoop material W after punching from the punch are mainly provided. .

Here, each part given (1)-(8) in FIG. 4 corresponds to each process (1)-(8) shown in FIG. 1, and processes punching etc. by the punch in each part and the die | dye corresponding to it. This is carried out. In the sequential conveying mold apparatus 10, the punch and die (not shown) in (2) of FIG. 4, for example, are magnet mounting hole forming parts (punching hole forming parts) for punching the magnet mounting hole h1. 4 and the punch and die (not shown) in (3) to (5) in FIG. 4 constitute a caulking forming portion for forming a caulking coupling portion (caulking metering hole and caulking projection) on the iron core sheet 2, The punch P6, the die D6, the flat pressing member 27 and the spring 28 in (6) of FIG. 4 constitute a pushback portion which pushes back after punching or hitting the central opening region h3. The punch P7 and the die D7 in (7) of FIG. 4 constitute an outline punching part for punching the outer shape h4 of the iron core sheet 2, and the squeeze ring (8) in FIG. 36 constitutes a lamination part for caulking the iron core thin plates 2 to form the laminate 3.

In FIG. 4, the flat pressing member 27 for implementing a pushback is provided in the die D6 used for the process (6). The flat pressing member 27 has a flat upper part in contact with the semi-punched portion and a lower part to which the spring 28 is connected, and is biased upward (in the direction of the punch P6) by the spring 28 connected to the lower part. It is. By this biasing force, the half-opened central opening region h3 is pushed back.

In addition, when the outer shape h4 of the iron core thin plate 2 is punched out by the punch P7 in step 7, the iron core thin plate 2 is already laminated in the die D7 in the step 8. The film is stacked on the 35 and then sequentially pushed into the squeeze ring 36 under the die D7. At this time, lateral pressure (force inside the radial direction) acts on each of the iron core thin plates 2, whereby coking engagement between the iron core thin plates 2 by the outer caulking protrusion m2 and the inner caulking protrusion k2 is performed. Is done. In the lamination of the iron core thin plates 2, there is an advantage that the degradation of the rigidity is suppressed by the presence of the pushed back center opening region h3 and the deformation thereof is prevented.

5 is a plan view of an iron core sheet according to a first modification of the method for producing a laminated iron core. In FIG. 1, the core 7 is punched out according to the circular outer shape h4 in the step 7, but as shown in FIG. 5, the iron core is shaped according to the outer shape h5 of the mold. It is also possible to punch the thin plate 2.

The iron core thin plate 2 shown in FIG. 5 is provided between the first outer peripheral portion 41 which defines at least a part of the outer edge h1b of each magnet mounting hole h1, and between these first outer peripheral portions 41. It has the 2nd outer peripheral part 42 arrange | positioned. Here, each 2nd outer peripheral part 42 is an arc-shaped part of the same form which makes convex shape in the radial direction outer side, and each 1st outer peripheral part 41 is thin thickness which connects between the 2nd outer peripheral parts 42. As shown in FIG. (Here, the width | variety 0.65 mm) is a connection part whose outer peripheral side is concave shape (or linear shape). The outer shape h5 of the iron core sheet 2 has a rotationally symmetrical shape with respect to the center thereof, and is generally six petals.

Here, the diameter L1 of at least one part of the 2nd outer peripheral part 42 (here, convex-shaped front end area | region) is set larger than the diameter L2 of the recessed part of the 1st outer peripheral part 41. As shown in FIG. This prevents the side pressure from acting on the first outer periphery 41 defining the outer periphery of the magnet mounting hole during caulking engagement in the lamination step using a circular (cylindrical) squeeze ring (i.e., the second outer periphery). Only the edge 42 can be brought into contact with the squeeze ring, and the deformation of the first outer peripheral portion 41 having a relatively low rigidity can be prevented. In addition, you may use the squeeze ring of the form substantially the same as the outer shape h5 of the iron core thin plate 2 in a process (8).

FIG. 6: is a top view of (A) iron core thin plate which concerns on the 2nd modified example of the manufacturing method of a laminated iron core, and (B) side view of laminated iron core. FIG. In FIG. 5 (the first modification) described above, the magnet mounting hole h1 has a rectangular shape, and at least a part of the outer edge h1b is defined by the first outer peripheral portion 41. However, in FIG. As shown in the drawing, it is preferable to use the iron core plate 52 for the laminated iron core 1 in which the first outer peripheral portion 41 is omitted (that is, the opening h1c is formed in the outer edge of some magnet mounting holes h1). It is possible.

As shown in FIG. 6A, in the iron core thin plate 52, the outer peripheral edge portions 41 disposed at six locations in the circumferential direction connecting between the respective second outer peripheral edge portions 42 are cut one by one. Has a configuration Such an iron core thin plate 52 has an area on the outer edge side of the rectangular magnet mounting hole h1 (three places) punched out in the step (2) shown in FIG. 1, for example. The new punching hole forming step 2a that enlarges the region Rh1 in A) can be realized before or after the step (2). In the subsequent process (7), the iron core thin plate 2 is punched out according to the outer shape h5 of mold release similarly to a 1st modification.

In that case, step (2a) may be performed selectively. For example, as shown in FIG. 6B, the first layer 61 on the lower side of the laminated iron core 1, the third layer 63 in the middle, and the fifth layer 65 on the upper side are constituted. Process (2a) is not performed about the iron core thin plate 2 mentioned above, and process (2a) about the iron core thin plate 52 which comprises the 2nd layer 62 and the 4th layer 64 of the laminated iron core 1 is performed. This is carried out. By laminating the iron core thin plates 2 and the iron core thin plates 52 in this manner, even when the first outer peripheral portion 41 of the iron core thin plate 52 is omitted, the magnet mounting hole in the laminated iron core 1 is properly secured. can do.

Alternatively, the laminated iron core 1 may be configured using only the iron core thin plate 52. In that case, a part of the iron core thin plate 52 is entirely rolled up in the step 7 (in this case, laminated in a state of being rotated by 60 °), for example, as in the case of FIG. 6B, the opening h1c. ) Can be shifted between the upper and lower iron core plates 52.

In addition, although the external shape of the iron core thin plate 2 and the iron core thin plate 52 in 2nd modification is the same petal shape as FIG. 5 (1st modification), it is not limited to this, Even if it is set as circular form shown in FIG. do. In addition, the quantity and position of the outer peripheral part 41 which are abbreviate | omitted, and the laminating method of the iron core thin plate 52 can be changed suitably.

Although this invention was demonstrated based on the specific embodiment, these embodiment is only an illustration, and this invention is not limited by these embodiment. For example, the caulking coupling part (caulking metering hole and caulking projection) for joining together iron core thin plates is not limited to the structure (quantity and arrangement) shown in embodiment, but is at least of the laminated body manufactured by the sequential transfer mold apparatus. Various changes are possible as long as the lamination state (i.e., the coking engagement state of each iron core sheet) can be retained. In addition, all the components of the manufacturing method of the laminated iron core which concerns on this invention shown in the said embodiment, and the laminated iron core manufacturing apparatus are not necessarily essential, and it is possible to select suitably as long as it does not deviate from the scope of this invention at least. .

1 laminated iron core
2 iron core lamination
10 sequential conveying mold apparatus (laminated iron core manufacturing apparatus)
D1-D7 die
h1 Magnetic Mounting Hole
h1a internal combustion
h1b
h2 center hole
h3 center opening area
h4 appearance
h5 appearance
k1 inner caulking meter
k2 inner caulking projection
m1 External caulking metering hole (caulking joint)
m2 outer caulking projection (caulking coupling)
p pilot hole
P1-P7 Punch
W hoop material (strap-shaped thin steel plate)

Claims (7)

As a manufacturing method of the laminated iron core formed by punching out an iron core thin plate from the strip | belt-shaped thin steel plate conveyed intermittently, and laminating | stacking a plurality of the iron core thin plates,
A punching hole forming step of forming a plurality of punching holes arranged in a circumferential direction of the iron core sheet;
A caulking forming step of forming a caulking joint on the iron core sheet before or after the punching hole forming process;
A pushback step of pushing back after punching or half blanking the central opening region to which the inner edge of each punching hole is connected;
An external punching process for punching the external shape of the iron core sheet;
And a lamination step of forming a laminate by caulking the iron core thin plates. The method according to claim 1,
The center opening region has a dovetail groove-shaped recess formed in an area between the punching holes adjacent to each other. The method according to claim 1 or 2,
And the separation hole is formed in the central opening region in a region between the punching holes adjacent to each other. 4. The method according to any one of claims 1 to 3,
The iron core sheet has a first outer peripheral portion defining the outer edge of the punching hole, and a second outer peripheral portion having a portion having a diameter larger than the first outer peripheral portion, the manufacturing method of the laminated iron core. The method of claim 4,
The iron core thin plate forms a rotationally symmetrical shape with respect to the center thereof, and the second outer peripheral portion forms a convex shape on the radially outer side. 4. The method according to any one of claims 1 to 3,
The appearance of the iron core thin plate is a circular iron core manufacturing method characterized in that the circular. An apparatus for manufacturing a laminated iron core obtained by punching out a thin iron core sheet from a strip-shaped thin steel sheet to be intermittently conveyed and laminating a plurality of the iron core thin plates,
A punching hole forming unit forming a plurality of punching holes disposed in a circumferential direction of the iron core sheet;
A caulking forming portion for forming a caulking coupling portion on the iron core sheet before or after the punching hole forming process;
A pushback unit for pushing back after punching or semi-punching the central opening region to which the inner edge of each punching hole is connected;
Outward punching portion for punching the outer shape of the iron core thin plate;
Stacking iron core manufacturing apparatus characterized in that it has; and a laminated portion to form a laminate by caulking the iron core thin plate.

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