JP4065596B2 - Integrated blade and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blade of a so-called impeller such as a turbine impeller and a pump impeller of a fluid power transmission device such as a torque converter.
[0002]
[Prior art]
As a method of attaching the blade to the shell, which is the main body of the impeller, there is known a method of brazing the contact portion between the blade and the shell positioned one by one in the shell. Therefore, finishing such as cutting is necessary as a post-process of brazing, and it is difficult to improve productivity and the cost is high. Also, the blade is inserted into the groove formed in the shell one by one into the groove and the groove portion of the shell is caulked (see JP-A-64-39963), or the protrusion formed on the blade is inserted into the slit formed in the shell. However, there are known methods for positioning the blades one by one and then bending the protrusions protruding to the back side of the shell. However, there are cases where sufficient mounting strength cannot always be secured by caulking or bending. In any of the attachment methods, it is necessary to attach the blades one by one, an attachment error is likely to occur, and it is difficult to improve so-called productivity including attachment workability.
[0003]
By the way, there is one described in Japanese Patent Application Laid-Open No. 7-4496 in which a plurality of blades can be attached to the shell at one time to improve attachment workability. In this apparatus, a blade component in which a plurality of blades are integrated is attached to a shell by welding to form an impeller. The blade component includes a large-diameter ring-shaped member concentrically arranged, a small-diameter ring-shaped member, a plurality of blade portions disposed between both ring-shaped members and integrally connected to both ring members via a coupling portion. In the case of punching, the blade portion is then tilted while being bent.
[0004]
[Problems to be solved by the invention]
However, in the blade component formed in this way, in order to secure the end shape of the blade portion, and in the case of punching, further ensuring the ease of bending of the blade portion and the shape of the end portion at the time of bending. In order to prevent deformation or the like, the connecting portion between both ring members must be made thin, and the strength is likely to be insufficient.
[0005]
If the strength is insufficient, the direction of the blade part is easily changed and deformed by punching, and if the connecting part is narrow and constricted, the so-called hot-rolling property is poor and it is caused by heat shrinkage by casting or forging. Since stresses such as residual stress tend to concentrate and defects are likely to occur in any case, care is required in handling from production to attachment to the shell, which hinders productivity improvement.
[0006]
Furthermore, when the blade portion is welded to the shell, so-called end face welding is performed at the edge of the plate-like blade, so that it is difficult to ensure sufficient welding strength and the welding quality is likely to vary.
[0007]
In view of such problems, an object of the present invention is to provide a blade and a method for manufacturing the blade that are excellent in productivity.
[0008]
[Means for Solving the Problems]
The present invention for solving the above problems is an integrated blade in which a plurality of blade portions constituting an impeller are integrated, and the plurality of blade portions are arranged in a ring shape at a predetermined interval. Each base end part of the substrate part is connected to the base end side of one of the adjacent blade parts, and the front end side is connected to the front end side of the other adjacent blade part, and stands up from both sides in the arrangement direction of each substrate part. An uneven ring member having a blade part and a top plate part that connects the tip ends of blade parts adjacent to each other is formed, and openings penetrating the front and back of the ring member are formed on both sides of the ring part in the ring member radial direction. An integrated blade characterized by being formed .
[0009]
Further, the integrated blade is a method for manufacturing an integrated blade in which a plurality of blade parts constituting an impeller are integrated, and a plurality of substrate parts arranged in a ring shape at a predetermined interval by drawing a steel plate, Forming an uneven ring member comprising a blade portion standing up from both sides in the arrangement direction of each substrate portion and a top plate portion connecting the tip side of the blade portions adjacent to each other, and an opening penetrating the front and back of the ring member, It is formed by being formed on both sides of the top plate portion in the radial direction of the ring member.
[0010]
In this way, if each blade part is integrated with the adjacent blade part via the substrate part or the top plate part, the strength is increased, so that deformation and direction change due to force are less likely to occur, and blade performance is reduced. Stabilizes and improves.
[0011]
In addition, the higher the strength of the integrated blade, the easier it is to handle, so when attaching to the shell or when assembling the integrated blade and the core ring, the workability of the operation is improved and the productivity of the impeller is improved. improves. And it is not necessary to produce one blade at a time, and productivity is improved.
[0012]
By the way, when the blade is attached to the shell by brazing, the blade may be distorted due to thermal effects. In this respect, according to the present invention, the integrated blade is formed by attaching the substrate portion to the ring-shaped concave portion of the shell, and the substrate portion and the ring-shaped concave portion of the shell can be easily brought into surface contact. If they are bonded by spot welding, laser welding, rivet caulking, or dowel squeezing, the blade part will not be affected by heat when attaching the integral blade to the shell, and the blade part will be distorted. Is prevented. In addition, when the integrated blade is used, the blade can be positioned by fixing the integrated blade, and if the integrated blade can be fixed, the welding position is not limited. Therefore, the thermal influence on the blade is small by using TIG welding that provides higher joint strength. It becomes possible to weld the parts.
[0013]
And when attaching the core ring to the top plate portion of the integral blade, the surface of the binding portion between the core ring and the top plate portion of the integral blade is brought into surface contact, and spot welding, laser welding, TIG welding, rivet caulking or If the unit blade is bonded by bulging, the blade unit is not affected by heat when the integral blade and the core ring are bonded, and the distortion of the blade unit is prevented.
[0014]
By preventing the blade from being distorted in this way, the mounting accuracy is improved, and the mounting quality and the production yield are improved. Moreover, it is excellent in workability compared with brazing. Furthermore, compared with caulking and bending, fixing strength and mounting accuracy are improved, and mounting quality and yield are improved.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, reference numeral 1 denotes an impeller, that is, a turbine impeller of a fluid torque converter for a vehicle. The turbine impeller 1 includes a shell 2 as a main body, a plurality of blades 3 fixed to the ring-shaped recess of the shell 2, and ends of the blades 3 opposite to the shell 2 side. As shown in FIG. 2, an integrated blade 10 in which all the blades 3 are integrally formed is attached to the shell 2.
[0016]
As shown in FIGS. 3 and 4, the integrated blade 10 has a substantially ring shape in appearance, and a plurality of substrate portions 11 extending in the radial direction from the inner ring end 10 a near the center to the outer ring end 10 b, The first blade portion 12a and the second blade portion 12b corresponding to the blade 3, and the adjacent blade portions 12a and 12b are erected from the edges of both sides of the substrate portion 11 arranged in a ring shape, that is, in the circumferential direction. Connecting portions 13 that connect the distal end sides to each other are provided, and openings 14 a and 14 b that communicate with the front and back of the integrated blade 10 are formed on both sides in the radial direction of the connecting portions 13.
[0017]
Each substrate portion 11 is provided with a convex rear surface 11a that is arranged at a constant interval in the circumferential direction of the integrated blade 10 and faces the shell 2 side. The back surface 11 a can come into surface contact with the concave surface 2 a (see FIG. 2) of the ring-shaped concave portion of the shell 2.
[0018]
The 1st blade part 12a and the 2nd blade part 12b are parts which function as a blade of the turbine impeller 1, and are connected to the edge of the peripheral direction by the side of the substrate part 11 in the full width. The first blade portion 12a swells in a convex shape in the circumferential direction toward the adjacent connecting portion 13 side, and extends in the rotational axis direction of the turbine impeller 1 (a direction perpendicular to the paper surface in FIG. 3). . Further, the second blade portion 12b bulges in a convex shape in the circumferential direction toward the adjacent substrate portion 11 side, and is inclined so that an angle formed with the substrate portion 11 becomes an obtuse angle.
[0019]
Each connecting portion 13 is integrally connected to the leading edges of the blade portions 12a and 12b in the middle in the radial direction, and has a concave surface 13a and a convex back surface on the shell 2 side (not shown). ). Of these, the concave shape of the surface 13 a can come into surface contact with the convex surface of the core ring 4. Further, the outer opening 14a existing on the outer side in the radial direction of the connecting portion 13 is formed on the same plane as the end face of the outer ring end 10b, while the inner opening 14b rotates from the back side to the front side of the integrated blade 10. It is established to open in the axial direction. The end face of the outer ring end 10b is formed in a shape that can be fixed to the shell 2 along the shape of the shell 2, and in the present embodiment, is perpendicular to the rotational axis direction of the turbine impeller 1. It has become.
[0020]
In the integrated blade 10 having such a shape, the blade portions 12a and 12b are integrally and firmly connected to the substrate portion 11 and the connecting portion 13, and the blade portions 12a and 12b are firmly fixed to each other. The orientation and deformation of the blade portions 12a and 12b are unlikely to occur, and the shape is stable. Therefore, handling in assembly work or the like is easy, which contributes to improvement in workability. Further, since all the blade portions can be formed at one time by drawing, that is, press forming, the productivity of the blade is improved.
[0021]
Next, a method for manufacturing the integrated blade 10 and the turbine impeller 1 will be described.
[0022]
The integral blade 10 is manufactured mainly by a drawing process for drawing a predetermined steel plate to form a ring member R (see FIG. 5), which is an intermediate processed product, and a punching process for forming the openings 14a and 14b. Manufactured through a process. The ring member R includes a bottom portion R1 corresponding to the substrate portion 11, a first side portion R2 corresponding to the first blade portion 12a, a second side portion R3 corresponding to the second blade portion 12b, and a top plate portion. It has an uneven shape consisting of R4. The top plate portion R4 includes a portion R4-1 that bulges on the back side corresponding to the connecting portion 13, a flat portion R4-2 where the outer opening 14a is formed, and a flat portion R4 where the inner opening 14b is formed. -3 has a substantially M-shaped surface.
[0023]
Referring to FIGS. 6 to 8, reference numeral 30 denotes a pressing device that performs a drawing process, and includes a lower die 31 fixed on a bolster (not shown) and an upper die 32 that is movable up and down with respect to the lower die 31. Prepare. Reference numeral 33 denotes a blank holder, and 34 denotes a knock pin for positioning the product. The lower die 31 is a die for forming the ring member R from the surface side, and the upper end surface of the convex portions 31a arranged at a constant interval in the circumferential direction corresponds to the concave surface of the ring member R1, that is, the substrate portion 11. The upper die 32 is a die that shapes the ring member R from the back surface side, and the upper end surface of the convex portion 32a corresponds to the back surface side of the top plate portion R4. The plurality of convex portions 31a and 32a included in the lower mold 31 and the upper mold 32 are bolted to the main body portion of the lower mold 31 or the upper mold 32 and are detachable. Therefore, when manufacturing an integral blade having the same size but different characteristics, it is only necessary to replace the protrusions 31a and 32a of the lower mold 31 and the upper mold 32, and the man-hours, period and cost for manufacturing the mold can be reduced.
[0024]
In such a state that the upper mold 32 is separated from the lower mold 31 and the blank holder 33, a blank material made of a predetermined steel plate is arranged between the lower mold 31 and the blank holder 33. The above-mentioned ring member R is formed by pressing the upper die 32 and the upper die 32 to perform drawing. Thereafter, the portion indicated by the two-dot chain line of both planar portions R4-2 and R4-3 of the top plate portion R4 and the edge of the outer ring end 10b are punched out to form the integrated blade 10 having the openings 14a and 14b.
[0025]
When the turbine impeller 1 is manufactured using the integrated blade 10, the integrated blade 10 is first attached to the ring-shaped recess of the shell 2 shown in FIG. 2, and is brought into surface contact with the concave surface 2a as shown in FIG. The integral point 10 is attached to the shell 2 by spot welding at a predetermined point P 1 of the substrate portion 11. Then, the core ring 4 is attached to the connecting portion 13, spot welding is performed on a predetermined point P 2 of the connecting portion 13 in contact with the convex surface of the core ring 4, and the core ring 4 is attached to the integral blade 10.
[0026]
In this way, if the substrate portion 11 of the integrated blade 10 is formed so as to be in surface contact with the concave surface 2a of the shell, the integrated blade 10 can be easily attached by spot welding, thereby improving workability. It can be firmly attached and the quality is stable. Further, predetermined portions P3 and P4 of the surface contact portion are laser-welded as shown in FIG. 10A, or the surface contact portion with the shell 2 as shown in FIG. The same effect can be obtained by TIG welding the inner and outer edges P5 of the inner and outer ring ends 10a and 10b having a small thermal influence on 12b and the end edge P6 of the connecting portion 13 which is a surface contact portion with the core ring 4. It is done. If the surface contact portion can be secured, in addition to spot welding, for example, as shown in FIG. 10C, the integrated blade 10 is attached by rivet caulking with the rivet 40, or as shown in FIG. It can be attached with a so-called dowel butterfly using the boss 41.
[0027]
If attachment methods such as spot welding, laser welding, TIG welding, and the above-described caulking can be used, the blade is not affected by heat and the generation of distortion can be prevented. Similarly, spot welding, laser welding, TIG welding, and the above-described caulking can be used to attach the core ring 4 to the connecting portion 13, and workability, fixing strength, and attachment quality are improved.
[0028]
The integrated blade 10 is not only a turbine impeller of a fluid torque converter for a vehicle, but also a pump impeller, a rotor of a fluid retarder used as an auxiliary brake in a vehicle, a stator, and the like of a fluid power transmission device. It can be applied as a blade for general impellers.
[0029]
By the way, in the said embodiment, although the direction of the 1st braid | blade part 12a is aimed toward the rotating shaft direction of the turbine impeller 1 and the drawing process is made easy, as shown in FIG.11 and FIG.12, the integral blade 50 is shown. If all the blade portions 51a and 51b can be inclined in a desired direction, the range of freedom in setting blade characteristics, such as selection of the inclination angle, is expanded. The manufacturing method will be described below. In addition, the same code | symbol is attached | subjected to the already demonstrated structure, and the description is abbreviate | omitted.
[0030]
First, as shown in FIG. 13, the blade part 51 is formed so as to stand upright in a direction perpendicular to the substrate part 11 by a drawing process using upper and lower molds having a predetermined shape (not shown). Subsequently, before the punching process, the lower mold 60 and the upper mold 70 shown in FIG. 14 are used to perform a pressing process mainly for bending, that is, a blade forming process, so that the orientation of the first blade portion 51a and the second A ring member (not shown), which is an intermediate processed product, is formed by setting the direction and shape of the blade portion 51b to a predetermined state. Thereafter, the openings 14a and 14b are punched out to complete the molding of the integrated blade 50.
[0031]
The main parts of the lower mold 60 and the upper mold 70 in the blade molding process are the lower mold 31 and the upper mold 32 in the drawing process. The convex portion 61 of the lower mold 60 has a sloped side surface 61a corresponding to the back surface of the second blade portion 51b which is one blade portion, and a portion of the top plate portion 52 of the integrated blade 50 near the second blade portion 51b. An upper end surface 61b corresponding to the back surface is provided, and the height corresponds to the height of the top plate portion 52 having a final shape lower than the height of the top plate portion 52 at the end of the drawing process. Moreover, the convex part 71 of the upper mold | type 70 is provided with the side surface 71a which exists along this front-end | tip position so that the front-end | tip position of the 1st braid | blade part 51a can be prescribed | regulated.
[0032]
Use a press molding device such as a so-called marhome molding device that uses a flexible material such as a rubber material for one of the upper and lower molds, or a press molding device such as a so-called hydrohome molding device that uses pressure fluid for either one of the upper and lower molds. Thus, it is possible to form a ring member that is an intermediate processed product. For example, the marhome forming apparatus includes a lower mold similar to the lower mold 31 shown in FIG. 6 and an upper mold (flexible punch) made of a rubber material, and a predetermined steel plate is used as a blank holder of the molding apparatus. A ring member that is an intermediate product of an integral blade having a shape as shown in FIG. 11 and a cross-sectional shape as shown in FIG. Mold. Further, the hydrohome forming apparatus includes a lower mold similar to the lower mold 31 shown in FIG. 6 and pressure transmission means made of pressure liquid functioning as an upper mold, and a predetermined steel plate is formed into a blank of the forming apparatus. While being held by the holder, the lower die and the pressure transmission means are drawn to form a ring member that is an intermediate product of the integrated blade. Thereafter, the opening is punched out at a predetermined position of the intermediate product to complete the molding of the integral blade.
[0033]
【The invention's effect】
As described above, according to the present invention, since the integrated blade is press-molded by drawing, the productivity of the integrated blade is improved. In addition, since the shape of the blade portion is stable, deformation such as a change in direction is unlikely to occur, handling is easy, workability in attaching to the shell is improved, and thus productivity of the impeller is improved.
[Brief description of the drawings]
1 is a cross-sectional view showing a turbine impeller according to an embodiment. FIG. 2 is a partial exploded perspective view showing a configuration of the turbine impeller of FIG. 1. FIG. 3 is a plan view showing an integrated blade according to the embodiment. 3 is a perspective view showing the main part of the integrated blade in FIG. 3. FIG. 5 is a perspective view showing the main part of the intermediate processed product after drawing and before punching. FIG. 6 is a schematic configuration of a press apparatus used in the drawing process. FIG. 7 is a plan view showing a lower die used for drawing processing. FIG. 8 is a plan view showing an upper die used for drawing processing. FIG. 9 is a sectional view showing a XX cross section of FIG. (A), (B), (C), (D) is a cross-sectional view of a turbine impeller showing an example of an integrated blade mounting method. FIG. 11 is a plan view showing a main part of an integrated blade of another embodiment. 12 is a cross-sectional view showing a YY cross section in FIG. 11. FIG. 13 is a cross-sectional view showing a state at the end of the drawing process. Sectional view showing the state at the end of the raid forming process [Explanation of symbols]
2 Shell 2a Concave surface 4 Core ring 10, 50 Integrated blade 11 Substrate part 12a, 51a First blade part 12b, 51b Second blade part 13 Connecting part 14a, 14b Opening

Claims (6)

An integrated blade in which a plurality of blade portions constituting an impeller are integrated,
The plurality of blade portions are arranged in a ring shape at a predetermined interval, and each proximal end portion of each blade portion is connected to the proximal end side of one of the adjacent blade portions, and the distal end side is adjacent. Forms an uneven ring member that is connected to the tip side of the other blade part and has a blade part that stands up from both sides in the arrangement direction of each substrate part and a top plate part that connects the tip sides of the blade parts adjacent to each other. And the opening penetrated in the front and back of a ring member was formed in the ring member radial direction both sides of a top plate part, The integrated blade characterized by the above-mentioned. A method of manufacturing an integrated blade in which a plurality of blade portions constituting an impeller are integrated,
A plurality of substrate parts that are drawn into a ring at predetermined intervals, a blade part that rises from both sides in the arrangement direction of each substrate part, and a top plate part that connects the tip side of the blade parts adjacent to each other Forming an uneven ring member comprising:
The manufacturing method of the integral blade characterized by forming the opening penetrated in the front and back of a ring member in the ring member radial direction both sides of a top-plate part.   An impeller obtained by attaching the substrate portion of the integral blade according to claim 1 to a ring-shaped concave portion of a shell as a main body of the impeller.   An impeller comprising a core ring attached to the top plate portion of the integral blade according to claim 3.   The impeller according to claim 4, wherein the coring is attached to the top plate portion of the integral blade by spot welding, laser welding, TIG welding, rivet caulking, or doweling caulking.   6. The attachment of the integral blade to the ring-shaped recess of the shell of the substrate portion by spot welding, laser welding, TIG welding, rivet caulking, or doweling caulking. The impeller according to any one of the above.

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