Sirocco fan manufacturing device, sirocco fan manufacturing method, and sirocco fan

Abstract

To provide a sirocco fan manufacturing device which enables assembly of a sirocco fan with higher efficiency than in conventional sirocco fan manufacturing devices.SOLUTION: A sirocco fan manufacturing device 1 includes: a blade positioning jig 10 which positions a plurality of blades 130; a pressing base material 20; a side plate pressing plate 30 connected to the pressing base material 20 through a first spring material 61 and having a pressing surface 32 for pressing a side plate; a preliminary bending punch 40 connected to the pressing base material 20 through a second spring material 62 and having, at a tip, a folding surface 42 which inclines in a direction in which a claw part 134 is folded; and a final bending punch 50 integrally connected to the pressing base material 20 and having, at a tip, a pressure-welding surface 52 disposed at the side to which the claw part 134 is folded. From closest to the blade 130, the pressing surface 32, the folding surface 42, and the pressure-welding surface 52 are arranged with predetermined offsets.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sirocco fan manufacturing apparatus for assembling a sirocco fan, a sirocco fan manufacturing method, and a sirocco fan manufactured by the manufacturing method. [Background technology]

[0002] As one type of centrifugal fan, a so-called "sirocco fan" is known (see, for example, Patent Documents 1 and 2).

[0003] Figure 10 shows an example of a sirocco fan 100 that is the subject of technical discussion in this specification. Figure 10(a) is a perspective view of the sirocco fan 100, and Figure 10(b) is a plan view of the sirocco fan 100 as viewed along the rotation axis AX.

[0004] 10, the sirocco fan 100 includes a pair of side plates 110, 120 arranged opposite each other, and a number of blades 130 arranged between the pair of side plates 110, 120. The side plates 110, 120 are roughly annular in shape. The sirocco fan 100 includes elongated blades 130 (the elongated direction is parallel to the rotation axis AX) arranged at intervals along a circumference centered on the rotation axis AX while being in contact with the opposing surfaces of the side plates 110, 120.

[0005] As a method for fixing the blade 130 to the side plates 110, 120, a method is known in which the claw portions 134 provided on both ends of the blade 130 are inserted or fitted into the through holes 112 of the side plate 110 and the through holes 122 of the side plate 120, respectively, and then the claw portions 134 are bent and crimped (see Patent Document 1, etc.).

[0006] 11 and 12 are diagrams for explaining in detail the fixing of the blade 130 to the side plates 110 and 120. FIG. 11(a) is a diagram showing the blade 130 viewed from a direction perpendicular to the main surface of the fin portion 132. FIG. 11(b) is a cross-sectional view of the blade 130 and the side plates 110 and 120, showing a portion corresponding to the cross section of the DD cutting line in FIG. 10(b) (however, FIG. 11(b) shows the state before assembly). FIG. 12(a) shows the state in which the claw portion 134 is inserted into the through hole 112 (before bending), and FIG. 12(b) shows the state in which the claw portion 134 is bent and crimped so as to be along the side plate 110 (after bending). The two diagrams in FIG. 12 are enlarged perspective views showing the state of the area corresponding to the two-dot chain line B in FIG. 10(a).

[0007] As shown in Fig. 11, a plurality of through holes 112 are provided in the side plate 110 (see also Fig. 10). Although hidden in Fig. 10, a plurality of through holes 122 are also provided in the side plate 120 arranged at the bottom of the drawing. The number of through holes 112, 122 corresponds to the number of blades 130. Meanwhile, each blade 130 is provided with a claw portion 134 at one end side 130a and the other end side 130b in the longitudinal direction.

[0008] As shown in FIG. 12, with the claw portions 134 inserted into the through holes 112, 122, respectively, the claw portions 134 are bent near the base ends 134b and crimped to fit against the side plate 110, thereby fixing the blades 130 to the side plates 110, 120. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2004-225682 A [Patent Document 2] JP 2015-151862 A Summary of the Invention [Problem to be solved by the invention]

[0010] However, since the blades 130 are arranged over 360° on a circumference centered on the rotation axis AX, the bending and crimping process of the claw portions 134 described above needs to be performed over 360° for the blades 130 and the through holes 112, 122, which are each arranged on a circumference.

[0011] The angles (angles when viewed from a direction parallel to the rotation axis AX) of the claw portions 134 of each blade 130 scattered around the circumference are not uniform, so the vectors of the force applied to bend the claw portions 134 also vary (see Figure 10). To complete the manufacture of the sirocco fan 100, each blade 130 must be bent and crimped while changing the direction of the force applied according to the angle of the claws 134 over the entire 360° circumference. Therefore, the manufacturing process for assembling the sirocco fan 100 is complicated.

[0012] For reference, Patent Document 1 describes that the tongue (claw portion) is bent and crimped (paragraph

[0010] ). However, it is unclear how the crimping is specifically performed. Patent Document 1 appears to assume that crimping will be done mainly by hand, piece by piece, and does not particularly consider specific techniques for improving assembly efficiency.

[0013] Furthermore, Patent Document 2 states that the protrusions (claws) are bent using a jig (first half of paragraph

[0066] ). However, it is silent as to what kind of jig is specifically used.

[0014] Furthermore, Patent Document 2 describes that a process is carried out in which all of the convex portions (claw portions) are bent at a predetermined angle, and then the blade material is compressed in the Z-axis direction using a press machine to bend the convex portions (claw portions) along the upper surface of the first panel (side panel) and the lower surface of the second panel (side panel) (second half of paragraph

[0066] ). However, there is no mention of what is specifically used and how the process of bending all of the protrusions (claws) to a predetermined angle is performed. In Patent Document 2, it is assumed that the work of bending one blade material (blade) to a predetermined angle is performed for each blade material (blade), which is likely to require a lot of work. In addition, Patent Document 2 separates the process of bending to a predetermined angle from the process of compressing with a press machine, and at least two setups are required to perform these processes, such as resetting the work (product material). Patent Document 2 does not particularly consider specific technologies for solving these problems and improving assembly efficiency.

[0015] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a sirocco fan manufacturing apparatus and a sirocco fan manufacturing method that are capable of assembling a sirocco fan more efficiently than conventional methods. [Means for solving the problem]

[0016] [1] According to one aspect of the present invention, there is provided a sirocco fan manufacturing apparatus for manufacturing a sirocco fan having long blades spaced apart along a circumference centered on a rotation axis, wherein the sirocco fan includes a pair of side plates arranged opposite each other and each having a plurality of through holes, and a plurality of blades arranged between the pair of side plates, each having a claw portion inserted into the through holes at both longitudinal ends, each of which is bent near a base end of the claw portion and fixed to the side plates.

[0017] The sirocco fan manufacturing device includes a blade positioning jig that positions a plurality of blades at respective predetermined positions along a circumference, a pressing base material that reciprocates along a press axis, a side plate pressing plate connected to the pressing base material via a first spring material, a preliminary bending punch connected to the pressing base material via a second spring material, and a main bending punch that is integrally connected to the pressing base material. The side plate pressing plate has a pressing surface that presses the side plate while contacting the side plate. The preliminary bending punch has a bending surface at its tip that is inclined in the direction in which the claw portion is bent. The main bending punch has a pressing surface at its tip that is arranged on the side where the claw portion is bent with respect to the position where the bending surface is arranged. When viewed from a direction perpendicular to the press axis, the pressing surface, the bending surface, and the pressing surface are arranged with a predetermined offset from each other in order of proximity to the positioned blade. When the pressing base material moves toward the blade, the pressing surface presses the side plate, the bending surface bends the claw portion to a predetermined angle, and the pressure contact surface presses the claw portion bent to the predetermined angle.

[0018] [2] According to another aspect of the present invention, there is provided a method for manufacturing the above-mentioned sirocco fan. The method of manufacturing a centrifugal fan includes: (1) a positioning and assembly process in which a plurality of blades are placed on a blade positioning jig and the blades are positioned at their respective predetermined positions along the circumference while assembling a side plate to the plurality of blades so that the claws of the blades are inserted into the through holes of the side plate; (2) a side plate pressing process in which a pressing base material is moved toward the blades along the press axis and the side plate is pressed down with the "pressing surface" of a side plate pressing plate connected to the pressing base material via a first spring material; and (3) a side plate pressing process in which the pressing base material is further moved toward the blades. and (3) a final bending process in which the pressing base material is further moved toward the blade, and the claw portion bent to the predetermined angle is pressed and further folded by a "pressure contact surface" of a final bending punch integrally connected to the pressing base material, so that the claw portion is fitted to the surface of the side plate and fixed to the side plate.

[0019] In the above [1] and [2], "the position where the bending surface is located" refers to the position when viewed along a direction parallel to the press axis. In addition, the phrase "a side plate pressure plate connected to a pressing base material via a first spring material" includes cases where the side plate pressure plate is directly connected to the pressing base material only via the first spring material, and also includes cases where the side plate pressure plate is indirectly connected to the pressing base material through the first spring material and another member in addition to the pressing base material. Similarly, the phrase "a pre-bending punch connected to a pressing base material via a second spring material" includes cases where the pre-bending punch is directly connected to the pressing base material only via the second spring material, and also includes cases where the pre-bending punch is indirectly connected to the pressing base material through the second spring material and another member in addition to the pressing base material.

[0020] [3] According to yet another aspect of the present invention, there is provided a sirocco fan manufactured by the above-described method for manufacturing a sirocco fan. In this sirocco fan, "squeezing marks" are formed on the outer surfaces of the claws from near the tips to near the base ends of the claws. Effect of the Invention

[0021] According to the sirocco fan manufacturing apparatus and method of the present invention, sirocco fans can be assembled more efficiently than ever before. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a diagram for explaining a sirocco fan manufacturing apparatus 1 according to a first embodiment. [Diagram 2] 4 is a flowchart showing a method for manufacturing the sirocco fan according to the first embodiment. [Diagram 3] 1A to 1C are cross-sectional views illustrating the operation of the sirocco fan manufacturing apparatus 1 and / or the sirocco fan manufacturing method according to the first embodiment. [Figure 4] 11 is a diagram showing how the claw portion 134 is bent in the preliminary bending step S30. FIG. [Diagram 5] 5 is a diagram showing a state of a claw portion 134 of the sirocco fan manufactured by the sirocco fan manufacturing method according to the first embodiment. FIG. [Figure 6] FIG. 11 is a diagram for explaining a sirocco fan manufacturing apparatus 2 according to a second embodiment. [Figure 7] 10 is a flowchart showing a method for manufacturing a sirocco fan according to a second embodiment. [Figure 8] 10A to 10C are cross-sectional views for explaining the operation of a sirocco fan manufacturing apparatus 2 and / or a sirocco fan manufacturing method according to a second embodiment. [Figure 9] 10A to 10C are cross-sectional views for explaining variations in the bending surface of the pre-bending punch. [Figure 10] FIG. 1 is a diagram showing an example of a sirocco fan 100 that is the subject of technical discussion in this specification. [Figure 11] 11 is a diagram for explaining in detail how the blade 130 is fixed to the side plates 110 and 120. FIG. [Figure 12] 11 is a diagram for explaining in detail how the blade 130 is fixed to the side plates 110 and 120. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The following describes a sirocco fan manufacturing apparatus and a sirocco fan manufacturing method according to the present invention with reference to the drawings. Note that the explanations of symbols common to each figure can be used in the explanations of the other figures, so explanations of the symbols will be omitted in the other figures. Also, in later drawings, symbols may be omitted for parts that have been indicated and explained by symbols in the previous drawings. Each drawing is a schematic diagram showing an example, and does not necessarily strictly reflect the actual dimensions, ratios, etc.

[0024] [Embodiment 1] 1. Configuration of Sirocco Fan Manufacturing Apparatus 1 according to the First Embodiment FIG. 1 is a diagram for explaining a sirocco fan manufacturing apparatus 1 according to the first embodiment. Fig. 1 shows the state after the product material positioning and combination step S10 (described later) is completed, and shows a portion corresponding to the cross section of the DD cutting line in Fig. 10(b). Fig. 1 is based on a cross-sectional view, but the first spring material 61, the second spring material 62, and the pressing means 210 are represented by spring symbols and thick arrows. The same is true for Figs. 3, 6, and 8 below.

[0025] 1, the sirocco fan manufacturing apparatus 1 according to the first embodiment includes a blade positioning jig 10, a pressing base material 20, a side panel holding plate 30, a preliminary bending punch 40, and a main bending punch 50. In addition to these, a body punching block 70 may also be included.

[0026] (1) Blade positioning jig 10 The blade positioning jig 10 assists in positioning the multiple blades 130 at their respective predetermined positions along the circumference (positions where each blade 130 should be placed). The blade positioning jig 10 may be considered to be some kind of fixing means for holding and fixing the blades 130. When each blade 130 is positioned according to the guide of the blade positioning jig 10 during the manufacturing process, the three-dimensional position and posture of the claw portion 134 of each blade is set to a position and posture where bending and crimping can be performed appropriately.

[0027] Specifically, the blade positioning jig 10 of embodiment 1 is configured with a blade hole into which one end of the blade 130 can be inserted, provided as a "positioning portion 12" (see FIG. 1). The blade positioning jig 10 may be installed on a base 200. Although it is not excluded that the blade hole as the positioning portion 12 is provided in a single location, it may be provided in multiple locations corresponding to the number of the blades 130. In embodiment 1, multiple positioning portions 12 (blade holes) are provided at predetermined intervals along a circumference centered on the rotation axis AX. According to the blade positioning jig 10 of the first embodiment, the blade 130 is held and its overall position and posture are determined by inserting the other end side 130b of the blade 130 into the blade hole. This allows the claw portion 134 of the one end side 130a to be positioned in an appropriate position and posture that matches the positions of the preliminary bending punch 40, the main bending punch 50, etc., which will be described later.

[0028] In the configuration example shown in FIG. 1, as described above, one end of the blade 130 is held and positioned, but it may also be possible to hold the fin portion 132 of the blade 130 and position the entire blade (see FIG. 6 of embodiment 2 described below).

[0029] 1, the blade 130 is directly positioned as described above. However, the present invention is not limited to this, and the blade 130 may be indirectly positioned. That is, the blade positioning jig 10 may first hold the side plate 120 arranged on the other end side 130b of the blade to fix its position and posture, and then insert the claw portion 134 of the blade 130 into the through hole 122 of the fixed side plate 120 to indirectly position the blade 130 (not shown).

[0030] (2) Press base material 20 The pressing base material 20 is a member that serves as the base for a series of pressing operations, and receives a pressing pressure PR from the outside (from above in the figure) by a pressing means 210 (such as a press machine). The pressing base material 20 that receives the pressing pressure PR is configured to reciprocate along a pressing axis PX. The pressing axis PX is set approximately parallel to the rotation axis AX of the sirocco fan 100. In addition, the "reciprocating motion" here may refer not only to a case where the absolute position of the pressing base material 20 moves, but also to a relative motion in which the product material (the blades 130, side panels 110, etc.) moves while the absolute position of the pressing base material 20 is fixed.

[0031] For reference, the sirocco fan manufacturing apparatus 1 according to the first embodiment includes multiple sets of a preliminary bending punch 40, a main bending punch 50, a second spring material 62, etc., which will be described later. In this case, it is preferable to provide a pressing base material 20 as one common to these sets, rather than providing a pressing base material 20 for each of these sets.

[0032] (3) Side panel retaining plate 30 The side plate pressing plate 30 has a pressing surface 32 that presses the side plates 110, 120 while contacting the side plates 110, 120. The side plate pressing plate 30 is connected to the pressing base member 20 via a first spring member 61. In this specification, "connected via the first spring material 61" includes cases where the side panel pressing plate 30 and the pressing base material 20 are directly connected via only the first spring material 61, and also cases where they are indirectly connected via the first spring material 61 and another member (the same applies to the side panel pressing process S20 and the explanation of the effects below, etc.).

[0033] When the side plate is pressed, the claw portion 134 on one end 130a of the blade 130 positioned by the blade positioning jig 10 described above is inserted up to its root (base end 134b) into the through hole 112 of the side plate 110. At this time, by pressing the side plate 110 with the pressing surface 32 of the side plate pressing plate 30, it is possible to prevent the side plate 110 from floating or becoming free even during the preliminary bending and main bending (described later), and to maintain the state in which the claw portion 134 is inserted into the through hole 112 up to its root (base end 134b).

[0034] For reference, in the first embodiment, the pressing surface 32 is a plane disposed perpendicular to the press axis PX (rotation axis AX) (see FIG. 1). However, the entire main surface of the side panel pressing plate 30 does not need to be a so-called flush plane as shown in FIG. 1, and for example, only the portion that contacts the side panel may be a protruding mesa shape. In this case, the protruding tip portion becomes the pressing surface 32.

[0035] (4) Pre-bending punch 40 The preliminary bending punch 40 is a punch for preliminarily bending the claw portion 134 of the blade 130. It can also be said that the preliminary bending punch 40 is a punch for changing the angle of the claw portion 134 of the blade 130, which stands upright in a straight line, to a predetermined angle. The preliminary bending punch 40 has at its tip a bending surface 42 inclined in a direction for bending the claw portion 134 (the claw portion 134 of the blade positioned by the blade positioning jig 10). The preliminary bending punch 40 is connected to the pressing base material 20 via a second spring material 62. In this specification, "connected via the second spring material 62" includes cases where the pre-bending punch 40 and the pressing base material 20 are directly connected via only the second spring material 62, as well as cases where they are indirectly connected via the second spring material 62 and another member (the same applies to the following pre-bending process S30, explanation of the effects, etc.).

[0036] For reference, the bent surface in the first embodiment is a plane formed at an angle of approximately 45° with respect to the protruding direction of the claw portion 134. Here, the "protruding direction of the claw portion 134" refers to a direction parallel to the press axis PX (rotation axis AX), and in the blade 130 used in the description of the first embodiment, it is a direction that coincides with the longitudinal direction of the blade 130. Also, "at an angle of 45°" can be said to mean that the angle of attack near the tip 134a of the claw portion is set to 45°. In this case, the claw portion 134 can be preliminarily bent to 45° by punching with the preliminary bending punch 40.

[0037] (5) First spring material 61, second spring material 62 The first spring material 61 and the second spring material 62 may be any type that exerts elastic force, such as a coil spring or an air spring.

[0038] (6) Main bending punch 50 The main bending punch 50 is a punch for further bending the claw portion 134 that has been preliminarily bent to a predetermined angle, and pressing it in a state in which it is in contact with the side plate 110 . The main bending punch 50 has a pressing surface 52 at its tip. When viewed along the press axis PX, this pressing surface 52 is disposed on the side where the claw portion 134 is to be bent, relative to the position where the bending surface 42 of the preliminary bending punch 40 described above is disposed. For example, in the example of Fig. 1, when viewed along the press axis PX, the bending surface 42 and the pressing surface 52 are disposed in this order toward the side where the claw portion 134 is to be bent (the right side in the figure).

[0039] The main bending punch 50 is connected integrally to the pressing base material 20 without using a spring material. The main bending punch 50 may be connected by being firmly fixed to the pressing base material, or may be integrally formed with the pressing base material using the same material.

[0040] In the first embodiment, the pressure contact surface 52 is a plane disposed perpendicular to the press axis PX (rotation axis AX) (see FIG. 1). However, it is not necessary for the entire surface to be flat as in FIG. 1. The pressure contact surface 52 may have any shape as long as the claw portion 134 bent at a predetermined angle can be further bent and crimped to fit the side plate 110. For example, it may have projections and recesses. In this case, the portion that comes into contact with the claw portion 134 is the pressure contact surface 52.

[0041] (7) Position of each surface, etc. When viewed from a direction perpendicular to the press axis PX, the pressing surface 32 of the side panel pressing plate 30, the bending surface 42 of the preliminary bending punch 40, and the pressure contact surface 52 of the main bending punch 50 are arranged with a predetermined offset from each other, in order of proximity to the positioned blade 130.

[0042] 1, there is an offset indicated by the symbol OFS1 between the level of the pressing surface 32 and the level of the bending surface 42 (the position where the tip 134a of the claw portion comes into contact). OFS1 is set to be greater than the protruding height of the claw portion 134 from the surface 110a of the side plate, so that the tip 134a of the claw portion can secure a clearance from the bending surface 42 when the pressing surface 32 begins to come into contact with the surface 110a of the side plate. Also, there is an offset, indicated by the symbol OFS2, between the level of the bending surface 42 and the level of the pressure contact surface 52. OFS2 is set to a necessary and sufficient size so that when the claw portion 134 is pre-bent to a predetermined angle, a clearance can be secured between the tip 134a of the claw portion and the pressure contact surface 52 of the main bending punch.

[0043] The thickness of the side panel pressure plate 30, the length and spring constant of the first spring material 61, the height of the preliminary bending punch 40, the length and spring constant of the second spring material 62, and the height of the main bending punch 50, etc. are set so as to satisfy the above-mentioned conditions.

[0044] The centrifugal fan manufacturing apparatus 1 is configured so that, as the pressing base material 20 moves toward the blade 130, the pressing surface 32 presses the side panel 110, the bending surface 42 bends the claw portion 134 to a predetermined angle, and the pressure contact surface 52 presses the claw portion 134 bent to the predetermined angle.

[0045] (8) Body-striking block 70 It is preferable that the sirocco fan manufacturing apparatus 1 further includes a core block 70. The core block 70 restricts, at a predetermined position, the movement of the pressing surface 32, which moves in conjunction with the movement of the pressing base material 20, when the pressing base material 20 moves toward the positioned blades 130. Here, "restricting" refers to preventing the pressing surface 32 from continuing to move any further at a predetermined position (level).

[0046] In the example of the first embodiment, as shown in Fig. 1, the core block 70 is connected to the blade positioning jig 10. The tip of the core block is a core surface 70a, and when the pressing surface 32 descends, the core surface 70a receives the pressing surface 32 and restricts its movement. Note that the core block 70 shown in Fig. 1 is assumed to be cylindrical, but is not limited to this and may be any shape as long as it satisfies the above-mentioned functions.

[0047] The "predetermined position" to be restricted is specifically set appropriately near the position (level) of the surface 110a of the positioned side plate. For example, it may be set at a position slightly lower than the position of the surface 110a of the side plate at the time when the positioning of the blades 130 is completed and the combination of the side plates 110 is completed.

[0048] 2. Method for manufacturing the sirocco fan according to the first embodiment Next, a description will be given of a method for manufacturing a sirocco fan according to embodiment 1. This description also includes a description of the operation of the sirocco fan manufacturing apparatus 1 described above.

[0049] Fig. 2 is a flowchart showing a method for manufacturing a sirocco fan according to embodiment 1. Fig. 3 is a cross-sectional view shown for explaining the operation of the sirocco fan manufacturing apparatus 1 according to embodiment 1 and / or the method for manufacturing a sirocco fan.

[0050] As shown in FIG. 2, the method of manufacturing the sirocco fan according to the first embodiment is a method for manufacturing the sirocco fan 100 having the structure described above, and includes a positioning and assembling process S10, a side panel pressing process S20, a preliminary bending process S30, and a main bending process S40, in this order.

[0051] (1) Positioning and assembly process S10 The positioning and assembly process S10 is a process in which a plurality of blades 130 are placed on a blade positioning jig 10, and while positioning the plurality of blades 130 at their respective predetermined positions along the circumference, the plurality of blades 130 are assembled with a side plate 110 so that the claw portions 134 of the blades 130 are inserted into the through holes 112 of the side plate 110 (see Figures 1 and 12(a)).

[0052] In the first embodiment, as described above, the blades 130 are positioned by inserting the other end side 130b of each blade 130 into the blade hole, which is the positioning portion 12 of the blade positioning jig 10. Then, the side plate 110 is combined with the multiple blades 130 such that the claw portions 134 of one end side 130a of the blade 130 are inserted into the through holes 112. In addition, the side plate 110 may be fixed by providing a side plate fixing jig (not shown) externally near the rotation axis AX and fitting a shaft mounting hole (no symbol indicated) provided in the center of the side plate 110 into this side plate fixing jig.

[0053] (2) Side plate pressing process S20 The side plate pressing process S20 is a process in which the pressing base material 20 is moved along the press axis PX toward the blade 130, and the side plate 110 is pressed by the "pressing surface 32" of the side plate pressing plate 30 connected to the pressing base material 20 via a first spring material 61 (see Figure 3(a)).

[0054] When the pressing base material 20 is lowered, the side panel pressing plate 30 is lowered accordingly, and the pressing surface 32 comes into contact with the surface 110a of the side panel. When the pressing base material 20 is then further lowered, the first spring material 61 contracts, generating an elastic force, which causes the pressing surface 32 to press the side panel 110 towards the side where the fin portion 132 is disposed.

[0055] It is preferable that the body contact block 70 restricts the descent of the pressing surface 32 from a position slightly displaced downward from the position where the surface 110 a of the side plate 110 starts to contact the pressing surface 32 .

[0056] (3) Pre-bending process S30 The preliminary bending process S30 is a process in which the pressing base material 20 is further moved toward the blade 130 while the "bending surface 42" provided on the preliminary bending punch 40 is brought into contact with the claw portion 134 to bend the claw portion 134 to a predetermined angle (see Figs. 3(b) to 3(c)). Here, the preliminary bending punch 40 is connected to the pressing base material 20 via the second spring material 62, and the "bending surface 42" is inclined in the direction in which the claw portion 134 is bent.

[0057] Fig. 3(b) is a diagram showing a state when the bending surface 42 starts to contact the tip 134a of the claw portion. Fig. 3(c) is a diagram showing a state where the preliminary bending is completed. Fig. 4 is a diagram showing a state where the claw portion 134 is bent in the preliminary bending step S30. Figs. 4(a) to 4(c) are enlarged cross-sectional views of the main part of the preliminary bending punch 40 and the claw portion 134 in Figs. 3(b) to 3(c), and show the bending state in stages.

[0058] In the early stage of the pre-bending step S30, when the pressing base material 20 is lowered, the pre-bending punch 40 is lowered accordingly, and the bending surface 42 comes into contact with the tip 134a of the claw portion (see FIGS. 3(b) and 4(a)). Thereafter, when the pressing base member 20 is further lowered, the second spring member 62 contracts, generating an elastic force, which causes the bent surface 42 to press the tip 134a of the claw portion. When the inclined bending surface 42 further descends at an angle relative to the claw portion 134, the tip 134a of the claw portion 134 moves away in the bending direction (to the right in the drawing) (see FIG. 4(b)), and is gradually bent from the tip 134a side to the base end 134b side until it comes into contact with the bending surface 42 (see FIGS. 3(c) and 4(c)). As a result, the claw portion 134 is bent to a predetermined angle.

[0059] The rigidity of the bent surface 42 is set to be higher than the rigidity of the claw portion 134. The above-mentioned bending process is similar to an ironing process, and ironing marks (or friction marks generated by friction with the bent surface 42) are formed on the outer surface 134c of the claw portion 134. The ironing marks will be described later.

[0060] (4) Final bending process S40 The final bending process S40 is a process in which the claw portions 134 are bent and pressed by the "pressure contact surface 52", thereby fixing the blade 130 to the side plate 110. Specifically, in the final bending process S40, the pressing base material 20 is further moved toward the blade 130, and the claw portions 134 bent at a predetermined angle are further bent by pressing them with the "pressure contact surface 52" of the final bending punch 50 integrally connected to the pressing base material 20, so that the claw portions 134 are aligned with the surface 110a of the side plate 110, thereby fixing the blade 130 to the side plate 110 (see Figures 3(d) to 3(e)). Fig. 3(d) is a diagram showing a state when the pressure contact surface 52 starts to contact the tip 134a of the claw portion, and Fig. 3(e) is a diagram showing a state where the main bending is completed.

[0061] In the early stage of the final bending step S40, when the pressing base material 20 is lowered and the final bending punch 50 is lowered accordingly, the pressing surface 52 comes into contact with the tip 134a of the claw portion (see FIG. 3(d)). Thereafter, when the pressing base material 20 is further lowered, the pressing surface 52 is further lowered accordingly, and the claw portion 134 is further bent, so that the claw portion 134 comes into contact with the side plate 110 and is aligned with the surface 110a of the side plate. When the pressing base material 20 is further lowered slightly, at least a part of the claw portion 134 is pressed against the surface 110a of the side plate and is finally crimped. At this time, in the example of the first embodiment, the claw portion 134 becomes approximately parallel to the surface 110a of the side plate (see FIG. 3(e)). As a result, the claw portion 134 is finally bent, the crimping process to the side plate 110 is completed, and the blade 130 can be fixed to the side plate 110.

[0062] The above-mentioned (2) side plate pressing process S20, (3) preliminary bending process S30, and (4) main bending process S40 are executed serially, continuously, and collectively while the pressing base material 20 receives the press pressure PR from the press means 210 and performs one stroke of pressing operation (while performing one downward movement).

[0063] By carrying out each of the steps (1) to (4) described above, the side plate 110 can be fixed to one end side 130a of each blade 130.

[0064] (5) Fixing the side panel 120 on the opposite side Thereafter, in a step (not shown) of inverting the work (intermediate material) having the plurality of blades 130 fixed to the side plate 110, the work is inverted upside down so that the other end side 130b of the blades 130 faces upward. Next, the inverted workpiece is positioned using another positioning jig, and then the claw portions 134 on the other end side 130b are inserted into each of the through holes 122 of another side plate 120, and the blades 130 and side plate 120 are assembled (a process corresponding to the positioning and assembly process S10). Next, the side plate pressing process S20, the preliminary bending process S30, and the main bending process S40 are performed on the claw portion 134 of the other end side 130b and the side plate 120 using the same manufacturing device as above. This allows the other end side 130b of the blade 130 and the side plate 120 to be fixed together.

[0065] By carrying out the above steps (1) to (5), the sirocco fan 100 can be obtained.

[0066] (6) Sirocco fan 100 manufactured by the method for manufacturing a sirocco fan according to embodiment 1 5 is a diagram showing the state of claw portion 134 of the sirocco fan manufactured by the sirocco fan manufacturing method in accordance with Embodiment 1. The figure is a plan view of the essential parts as seen in a direction parallel to the rotation axis AX (not shown) of the sirocco fan.

[0067] As explained in (3) above, when the preliminary bending process S30 is carried out, the tip 134a of the claw portion comes into contact with the bending surface 42, and as the press stroke progresses further, the tip 134a of the claw portion moves away along the bending surface 42 and gradually undergoes plastic deformation from the tip 134a side to the base end 134b side (similar to an ironing process), until the outer surface 134c of the claw portion 134 comes into contact with the bending surface 42. 5, in the case of the sirocco fan 100 manufactured by the sirocco fan manufacturing method according to the first embodiment, "squeezing marks 136 (or friction marks)" are formed on the outer surfaces 134c of the claw portions 134 from near the tips 134a of the claw portions to near the base ends 134b. Note that "near the base ends" does not have to be the exact position of the base ends 134b (bases) of the claw portions 134, but refers to a position that is closer to the base ends than to the tips 134a.

[0068] 3. Effects of the Sirocco Fan Manufacturing Apparatus 1 and Sirocco Fan Manufacturing Method According to the First Embodiment (1) In embodiment 1, the side panel pressure plate 30 has a pressure surface 32, the preliminary bending punch 40 has a bending surface 42 at its tip, and the main bending punch 50 has a pressure surface 52 at its tip, and these pressure surface 32, bending surface 42 and pressure surface 52 have predetermined offsets OFS1, OFS2 from each other and are arranged in this order in order of proximity to the blade 130.

[0069] Due to this configuration, when the pressing base material 20 descends, the pressing surface 32, the bending surface 42 and the pressure contact surface 52 can reach the position of the claw portion 134 sequentially with a time lag depending on the bending state of the claw portion 134.

[0070] In addition, the bending surface 42 of the preliminary bending punch 40 is inclined in a direction to bend the claw portion 134. When the bending surface 42 descends, the claw portion 134 is gradually bent by the inclined bending surface 42, so that the preliminary bending can be performed up to a predetermined angle.

[0071] In addition, the pressing surface 52 of the main bending punch 50 is disposed on the side where the claw portion 134 is bent, relative to the position where the bending surface 42 of the preliminary bending punch 40 is disposed. Therefore, when the vicinity of the tip 134a of the claw portion for which preliminary bending has been completed protrudes from the side position of the preliminary bending punch 40, the pressing surface 52 of the main bending punch 50 arriving immediately thereafter can subsequently capture the vicinity of the tip 134a of the protruding claw portion and start main bending. In this way, main bending can be performed continuously from the completion of preliminary bending.

[0072] In addition, the side plate pressing plate 30 is connected to the pressing base material 20 via a first spring material 61. Therefore, the force for pressing the side plate can be exerted by elastic force, and even when the pressing base material 20 further descends for the subsequent pre-bending, the spring does not contract and interfere with the downward stroke. Similarly, the pre-bending punch 40 is connected to the pressing base material 20 via a second spring material 62. Therefore, the force for pre-bending can be exerted by elastic force, and even when the pressing base material 20 further descends for the subsequent main bending process, the spring does not contract and interfere with the downward stroke.

[0073] In this manner, when the pressing base material 20 moves toward the blade 130, the pressing surface 32 presses the side plate 110, the bending surface 42 bends the claw portion 134 to a predetermined angle, and the pressure contact surface 52 presses the claw portion 134 bent to the predetermined angle. In other words, the bending of the claw portion 134, crimping, etc. can be completed by the vertical movement of the components. For this reason, even if the angles of the main surfaces of the claw portions 134 of the blades 130 scattered around the circumference are different and the bending directions are not uniform, as in the case of a centrifugal fan, the bending of the claw portions 134 of each blade 130 in different directions can be performed simultaneously and collectively by simply arranging the components (preliminary bending punch 40, main bending punch 50, etc.) at positions corresponding to each blade 130 on the circumference and lowering the commonly provided pressing base material 20 to the bottom dead center.

[0074] As described above, according to the centrifugal fan manufacturing apparatus 1 and centrifugal fan manufacturing method of embodiment 1, while the pressed base material 20 receives the press pressure PR from the external press means 210 and performs one-stroke pressing operation, the pre-bending, main bending, etc. of the claw portions 134 of each of the blades 130 scattered around the circumference can be automatically, continuously, and collectively performed, and each of the blades 130 can be automatically, continuously, and collectively fixed to the side panel 110 (similar to 120).

[0075] Therefore, according to the first embodiment, the sirocco fan can be assembled more efficiently than before.

[0076] (2) The sirocco fan manufacturing apparatus 1 according to the first embodiment further includes a core block 70 that restricts the movement of the pressing surface 32 at a predetermined position when the pressing base material 20 moves toward the positioned blade 130. If there is any movement beyond the bottom dead center during the pressing operation by the external pressing means 210, the core block 70 prevents the pressing surface 32 from moving any further. This makes it possible to prevent unnecessary stress from being applied to the blade 130.

[0077] (3) The bent surface 42 in the first embodiment is a flat surface formed at an angle of approximately 45° with respect to the protruding direction of the claw portion 134 .

[0078] If the deflection angle of the bending surface 42 is set close to 0°, the force contributing to the start of bending of the claw portion 134 is weak, and the load on the claw portion 134 can be reduced, but the specified angle at the completion of preliminary bending will be shallow. Conversely, if the deflection angle is set close to 90°, the load near the base end 134b of the claw portion will be large at the start of bending, increasing the possibility of bending failure. If the deflection angle is set to a flat surface of approximately 45° as in the first embodiment, it is possible to achieve a good balance between the generation of the force contributing to bending at the start of bending, the reduction of the load near the base end 134b of the claw portion, and ensuring the bending angle at the completion of preliminary bending.

[0079] [Embodiment 2] Fig. 6 is a diagram shown for explaining the sirocco fan manufacturing apparatus 2 according to the second embodiment. Fig. 7 is a flowchart showing the sirocco fan manufacturing method according to the second embodiment. Fig. 8 is a cross-sectional view shown for explaining the operation of the sirocco fan manufacturing apparatus 2 and / or the sirocco fan manufacturing method according to the second embodiment. Fig. 8(a) shows the side plate pressing steps S20A, S20B being performed, and Fig. 8(b) shows the completion of the main bending steps S40A, S40B.

[0080] 1. Configuration of Sirocco Fan Manufacturing Apparatus 2 according to the Second Embodiment Sirocco fan manufacturing apparatus 2 according to embodiment 2 basically has the same configuration as sirocco fan manufacturing apparatus 1 according to embodiment 1, but differs from sirocco fan manufacturing apparatus 1 according to embodiment 1 in that the sirocco fan manufacturing apparatus is configured with a mold. Also, it differs from sirocco fan manufacturing apparatus 1 according to embodiment 1 in that crimping is performed simultaneously (at the same stage) on both ends of blade 130.

[0081] (1) Realization through molds As shown in FIG. 6, a sirocco fan manufacturing apparatus 2 according to the second embodiment is configured with a pair of upper and lower mold dies 90A and 90B including a die set upper mold 92A and a die set lower mold 92B.

[0082] At this time, the blade positioning jig 10' is formed in the lower die 90B. The blade positioning jig 10' may be constructed, for example as shown in FIG. 6, by providing a positioning portion 12' with a slit at the tip of an arm through which the fin portion 132 can be picked up, and placing the arm on the die set lower mold 92B.

[0083] The pressing base material 20A may be configured in a die set upper part 92A as shown. The side plate pressing plate 30A may be formed of a plate material 94A provided with a punch window 94a that faces the claw portion 134 of the positioned blade 130. This plate material 94A is connected to the die set upper mold 92A via a first spring material 61. Here, "connected via the first spring material 61" includes cases where the plate material 94A and the die set upper mold 92A are directly connected via only the first spring material 61, and also includes cases where they are indirectly connected via another member in addition to the first spring material 61. The same applies to the configuration around the first spring material 62 between the plate material 94B and the die set lower mold 92B described below in (2).

[0084] In the internal space 94b of the punch window, the bending surface 42 of the preliminary bending punch 40A and the pressure contact surface 52 of the main bending punch 50A are configured to be movable along the press axis PX. A space is provided in the internal space 94b of the punch window for at least retracting the claw portion 134, so that when the pressing surface 32 abuts against the surface 110a of the side plate, the claw portion 134 protruding from the side plate 110 is retracted into this space so as not to interfere with the bending surface 42. Since "the bending surface 42 of the preliminary bending punch 40A and the pressure contact surface 52 of the main bending punch 50A are capable of moving along the press axis PX in the internal space 94b of the punch window," preliminary bending and main bending are possible in the internal space 94b of the punch window.

[0085] The preliminary bending punch 40A is connected to a plate material 93A for the preliminary bending punch, and the plate material 93A is connected to an upper die 92A of the die set via a second spring material 62. Here, "connected via the second spring material 62" includes cases where the plate material 93A and the die set upper mold 92A are directly connected via only the second spring material 62, and also includes cases where they are indirectly connected via another member in addition to the second spring material 62. The same applies to the configuration around the second spring material 62 between the plate material 93B and the die set lower mold 92B described below in (2).

[0086] The main bending punch 50A is connected to the die set upper die 92A.

[0087] In the centrifugal fan manufacturing apparatus 2, the positioning portion 12' of the blade positioning jig 10', the bending surface 42 of the preliminary bending punch 40A, and the pressure contact surface 52 of the main bending punch 50A are each arranged along a circumference centered on the rotation axis AX in accordance with the number of blades 130 to be fixed to the side panel 110.

[0088] Note that "down" refers to the direction in which gravitational acceleration acts on an object, and "up" refers to the opposite direction to "down." However, "up" and "down" in this specification are used for the convenience of explanation, and when implementing the present invention, the sirocco fan manufacturing apparatus may be turned upside down or rotated 90 degrees and placed on its side.

[0089] (2) Crimping both ends of the blade 130 simultaneously In addition, the centrifugal fan manufacturing apparatus 2 of embodiment 2 is also equipped with a pressing base material 20B, a side panel pressure plate 30B, a preliminary bending punch 40B and a main bending punch 50B in the lower mold 90B, making it possible to perform crimping processing on both ends of the blade 130 simultaneously.

[0090] The pressing base material 20B may be formed from the lower die set 92B. The side panel pressing plate 30B has a configuration similar to that of the side panel pressing plate 30A of the upper mold 90A, and is composed of a plate material 94A having a punch window 94a facing the claw portion 134, and the bending surface 42 and the pressure contact surface 52 are configured to be movable in the internal space 94b of the punch window.

[0091] The preliminary bending punch 40B is connected to a plate material 93B for the preliminary bending punch. The plate material 93B is connected to a lower die 92B of the die set via a second spring material 62. The main bending punch 50B is connected to the lower die set 92B.

[0092] The body block 70 is connected to the side panel pressing plate 30B. The height W of the body block 70 corresponds to the distance between the surface 110a of the side panel 110 and the surface 120a of the side panel 120 (the figure shows an example in which both have the same W).

[0093] On the one hand, the pressing base material 20A, side plate holding plate 30A, preliminary bending punch 40A, and main bending punch 50A of the upper die 90A operate to fold the claw portion 134 of one end side 130a and fix it to the side plate. On the other hand, the pressing base material 20B, side plate holding plate 30B, preliminary bending punch 40B, and main bending punch 50B of the lower die 90B operate to fold the claw portion 134 of the other end side 130b and fix it to the side plate.

[0094] The pair of upper and lower dies 90A and 90B thus configured move in the direction of closing each other when pressed from the outside, so that during one stroke of pressing, the claw portions 134 at both ends of the blade 130 are bent and the blade 130 is fixed (fixed by crimping) to the pair of side plates 110, 120.

[0095] It is preferable that the specifications (thickness, length, spring coefficient, etc.) of the components such as the plate material, die set material, and spring material used here are the same for those placed in the upper die 90A and those placed in the lower die 90B. Since the manufacturing process proceeds simultaneously on the top and bottom and similar processing is performed, the symmetry of the crimping quality on the top and bottom can be ensured by making the specifications of the top and bottom components the same.

[0096] 2. Configuration of the Sirocco Fan Manufacturing Method According to the Second Embodiment The method of manufacturing a sirocco fan according to the second embodiment is basically similar to the method of manufacturing a sirocco fan according to the first embodiment, but differs in that the steps from the side plate pressing process to the final bending process are performed on both ends of the blade 130 at the same stage.

[0097] The method for manufacturing a sirocco fan according to the second embodiment uses an upper die 90A having a pressing base material 20A, a side plate pressing plate 30A, a preliminary bending punch 40A, and a final bending punch 50A, and a lower die 90B having a pressing base material 20B, a side plate pressing plate 30B, a preliminary bending punch 40B, and a final bending punch 50B. The method for manufacturing a sirocco fan according to the second embodiment involves moving the pair of upper die 90A and lower die 90B in a closing direction by pressing from the outside, and performing side plate pressing steps S20A, S20B, preliminary bending steps S30A, S30B, and final bending steps S40A, S40B at both ends of the blade 130 during one stroke of pressing.

[0098] That is, as shown in FIG. 7, once the positioning and assembling step S10 of the blade 130 and the side plates 110 and 120 is performed, the pair of upper and lower dies 90A and 90B are moved in the closing direction to perform the side plate pressing step S20A by the upper die 90A and the side plate pressing step S20B by the lower die 90B at approximately the same timing and at the same stage. At this time, the manufacturing equipment and the work are in the state shown in FIG. 8(a). Next, the preliminary bending step S30A by the upper die 90A and the preliminary bending step S30B by the lower die 90B are performed at approximately the same timing and at the same stage. Next, the main bending step S40A by the upper die 90A and the main bending step S40B by the lower die 90B are performed at approximately the same timing and at the same stage. At this time, the manufacturing equipment and the work are in the state shown in FIG. 8(b).

[0099] 3. Effects of the Sirocco Fan Manufacturing Apparatus 2 and Sirocco Fan Manufacturing Method According to the Second Embodiment (1) According to the sirocco fan manufacturing apparatus 2 and the sirocco fan manufacturing method of the second embodiment, since it is composed of a pair of upper and lower dies 90A and 90B, side plate pressing, preliminary bending, and main bending can be performed automatically, continuously, and collectively during one press stroke simply by moving the dies in the closing direction with an external press. This makes it possible to assemble sirocco fans more efficiently than in the past. Furthermore, since the sirocco fan manufacturing apparatus 2 is composed of dies, the crimping process is highly reproducible, making it easier to maintain product quality.

[0100] (2) In addition to the above, the lower die 90B of the sirocco fan manufacturing apparatus 2 is also equipped with a pressing base material 20B consisting of a side plate holding plate 30B, a preliminary bending punch 40B, a main bending punch 50B, and a die set lower die 92B. Therefore, with just one press stroke, the claws 134 at both ends of the blade 130 can be simultaneously bent to fix the blade 130 to each of the side plates 110, 120. In other words, the crimping process can be completed at both ends of the blade 130 while the product material (blade 130, side plates 110, 120) remains in the same position and posture without having to turn over the product material. Therefore, the sirocco fan can be assembled with even higher efficiency than before.

[0101] Except for the fact that the sirocco fan manufacturing apparatus 2 and the sirocco fan manufacturing method according to the second embodiment are configured using a mold and that crimping is performed simultaneously on both ends of the blades 130, they have basically the same configuration as the sirocco fan manufacturing apparatus 1 and the sirocco fan manufacturing method according to the first embodiment. Therefore, they similarly have the corresponding effects of the sirocco fan manufacturing apparatus 1 and the sirocco fan manufacturing method according to the first embodiment.

[0102] Although the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment. It can be embodied in various forms without departing from the spirit of the present invention, and for example, the following modifications are also possible.

[0103] (1) The bending surface 42 of the pre-bending punches 40, 40A, 40B in each embodiment is a flat surface formed at an angle of approximately 45° (see also FIG. 9(a)). However, the present invention is not limited to this. For example, the bending surface 42' may be formed to have a concave shape recessed inward like the pre-bending punch 40' shown in FIG. 9(b) (Modification 1). Also, the bending surface 42'' may be formed to have a convex shape bulging outward like the pre-bending punch 40'' shown in FIG. 9(c) (Modification 2).

[0104] (2) The body block 70 described in each embodiment is disposed on the lower side facing the upper side plate pressing plate 30, 30A (see Figs. 1 and 6). However, the present invention is not limited to this, and the body block 70 may be connected to the upper side plate pressing plate 30, 30A and integrated therewith.

[0105] (3) In the description of the second embodiment, an example in which the blade positioning jig 10' is provided integrally with the pressing base material 20B of the lower die 90B has been described. However, the present invention is not limited to this. For example, the blade positioning jig 10' may be provided integrally with the side plate pressing plate 30B of the lower die 90B. In this case, when positioning the blades 130, first, the side plate 120 to be placed on the lower side is positioned and fixed, and the side plate 120 is brought into contact with the pressing surface 32 of the side plate pressing plate 30B of the lower die 90B. Then, the blades 130 are positioned while inserting the tips 134a of the claws into the through holes 122 of the side plate 120.

[0106] (4) In each drawing explaining each embodiment, the claw portion 134 provided on one end side 130a or the other end side 130b of the blade 130 is shown as a claw portion 134 consisting of a single protrusion. However, the present invention is not limited to this. The present invention can be similarly applied to a blade 130 provided with multiple claw portions 134 on each end. For example, the present invention can be applied to a blade having multiple claw portions on each end, such as the blades shown in Patent Documents 1 and 2. [Explanation of symbols]

[0107] 1, 2... centrifugal fan manufacturing apparatus, 10, 10'... blade positioning jig, 12, 12'... (blade) positioning portion, 20, 20A, 20B... pressing base material, 30, 30A, 30B... side panel pressing plate, 32... pressing surface, 40, 40', 40'', 40A, 40B... preliminary bending punch, 42, 42', 42'' ... bending surface, 50, 50A, 50B... main bending punch, 52... pressure contact surface, 61... first spring material, 62... second spring material, 70... body thrust block, 70a... body thrust surface, 90A... upper die, 90B... lower die, 92A... upper die set, 92B... lower die set, 93A, 93B... plate material for preliminary bending punch, 94A... plate material for side plate pressing plate, 94a... punch window, 94b... internal space of punch window, 100... Sirocco fan, 110... (First) side plate, 110a...surface (of first side plate), 112...through hole (of first side plate), 120...(second) side plate, 120a...surface (of second side plate), 122...through hole (of second side plate), 130...blade, 130a...one end side of blade, 130b...other end side of blade, 132...fin portion of blade, 134...claw portion, 134a...tip of claw portion, 134b...base end of claw portion, 134c...outer surface of claw portion, 136...squeezing marks, 200...base, 210...pressing means

Claims

1. A sirocco fan manufacturing apparatus for manufacturing a sirocco fan having long blades arranged at intervals along a circumference centered on a rotation axis, comprising: The sirocco fan includes a pair of side plates, each of which has a plurality of through holes and is disposed opposite each other, and a plurality of the blades, which are disposed between the pair of side plates and have claw portions at both ends in a longitudinal direction which are inserted into the through holes, and each of the claw portions is bent near a base end of the claw portion and fixed to the side plates, The sirocco fan manufacturing device is a blade positioning tool for positioning the plurality of blades at respective predetermined positions along the circumference; A pressing base member that reciprocates along a press axis; a side plate holding plate connected to the pressing base material via a first spring material; A pre-bending punch connected to the pressing base material via a second spring material; A main bending punch integrally connected to the pressing base material, the side plate pressing plate has a pressing surface that presses the side plate while contacting the side plate, The pre-bending punch has a bending surface at a tip end inclined in a direction in which the claw portion is bent, The main bending punch has a pressure contact surface at a tip end, the pressure contact surface being arranged on a side where the claw portion is bent with respect to a position where the bending surface is arranged, When viewed from a direction perpendicular to the press axis, the pressing surface, the bending surface, and the pressure contact surface are arranged with a predetermined offset from each other in order from the positioned blade, When the pressing base material moves toward the blade, the pressing surface presses the side plate, the bending surface bends the claw portion to a predetermined angle, and the pressure contact surface presses the claw portion bent to the predetermined angle. A sirocco fan manufacturing apparatus comprising:

2. The sirocco fan manufacturing apparatus according to claim 1, This is a centrifugal fan manufacturing apparatus, further comprising a body block that restricts the movement of the pressing surface, which is linked to the movement of the pressing base material, at a predetermined position when the pressing base material moves toward the positioned blade.

3. The sirocco fan manufacturing apparatus according to claim 1 or 2, The bending surface is a plane formed at an angle of approximately 45° with respect to the protruding direction of the claw portion.

4. In the sirocco fan manufacturing apparatus according to any one of claims 1 to 3, The sirocco fan manufacturing device is composed of a pair of upper and lower dies including a die set upper die and a die set lower die, The blade positioning jig is configured in the lower die, The pressing base material is constituted by the upper die of the die set, the side plate pressing plate is made of a plate material having a punch window that faces the claw portion of the positioned blade, In the internal space of the punch window, the bending surface of the preliminary bending punch and the pressure contact surface of the main bending punch are movable along the press axis, the positioning portion of the blade positioning jig, the bending surface of the pre-bending punch, and the pressure contact surface of the main bending punch are provided along a circumference centered on the rotation axis according to the number of the blades to be fixed to the side plate, respectively. A sirocco fan manufacturing apparatus comprising:

5. The sirocco fan manufacturing apparatus according to claim 4, The lower die also includes the pressing base member, which is made up of the side plate pressing plate, the preliminary bending punch, the main bending punch, and the die set lower die, The pair of upper and lower dies are moved in a closing direction by pressing from the outside, and the claw portions at both ends of the blade are bent during one stroke of pressing operation, so that the blade is fixed to the pair of side plates. A sirocco fan manufacturing apparatus comprising:

6. A method for manufacturing a sirocco fan having long blades arranged at intervals along a circumference centered on a rotation axis, comprising the steps of: The sirocco fan includes a pair of side plates, each of which has a plurality of through holes and is disposed opposite each other, and a plurality of the blades, which are disposed between the pair of side plates and have claw portions at both ends in a longitudinal direction which are inserted into the through holes, and each of the claw portions is bent near a base end of the claw portion and fixed to the side plates, a positioning and assembling process of placing the plurality of blades on a blade positioning jig, and assembling the plurality of blades with the side plate while positioning the plurality of blades at respective predetermined positions along the circumference, so that the claw portions of the blades are inserted into the through holes of the side plate; a side plate pressing process in which a pressing base material is moved toward the blade along a press axis, and the side plate is pressed by a "pressing surface" of a side plate pressing plate connected to the pressing base material via a first spring material; a preliminary bending process in which, while the pressing base material is further moved toward the blade, a "bending surface" of a preliminary bending punch connected to the pressing base material via a second spring material and inclined in a direction in which the claw portion is bent is brought into contact with the claw portion to bend the claw portion to a predetermined angle; a final bending process in which the pressing base material is further moved toward the blade, and the claw portion bent at the predetermined angle is pressed and further bent with a "pressure contact surface" of a final bending punch integrally connected to the pressing base material, and the blade is fixed to the side plate so that the claw portion is aligned with the surface of the side plate; A method for manufacturing a sirocco fan, comprising the steps of:

7. The method for manufacturing a sirocco fan according to claim 6, using an upper die having the pressing base material, the side plate pressing plate, the preliminary bending punch, and the main bending punch, and a lower die having the pressing base material, the side plate pressing plate, the preliminary bending punch, and the main bending punch, a pair of the upper die and the lower die are moved in a closing direction by pressing from the outside, and the side plate pressing step, the preliminary bending step, and the main bending step are performed at both ends of the blade during one stroke of pressing operation; A method for manufacturing a sirocco fan, comprising:

8. 8. A sirocco fan manufactured by the sirocco fan manufacturing method according to claim 6 or 7, characterized in that "squeezing marks" are formed on the outer surfaces of the claw portions from near the tip ends of the claw portions to near the base ends of the claw portions.

Images