JP6165509B2 - Method for manufacturing rotating body of fluid machine - Google Patents

Description

  The present invention relates to a manufacturing method for manufacturing a rotating body constituting a fluid machine, for example, a rotating body constituting a compressor or a turbine, using a composite material of fiber reinforced resin. In particular, the present invention relates to a manufacturing method in which a fiber reinforced resin of a composite material is a combination of a discontinuous fiber resin coated with discontinuous fibers and a continuous fiber resin coated with continuous fibers, and a rotating body is manufactured using these fiber reinforced resins.

Among fluid machines, it consists of multiple blades attached to the outer peripheral surface of the hub, and there are blowers, compressors and pump impellers that give energy to the fluid, and those that receive energy from the fluid, There are turbines and turbine impellers.
These impellers are known to be made of fiber reinforced resin in order to further reduce the moment of inertia while ensuring strength.

  For example, it is shown in Japanese Patent No. 3018853 (Patent Document 1), US Patent Application Publication No. 2012/0124994 and drawings (Patent Document 2).

This patent document 1 discloses a fiber reinforced resin impeller, and shows an inexpensive fiber reinforced resin impeller that suppresses the generation of noise unique to a turbocharger-equipped vehicle.
For the purpose of preventing the generation of abnormal noise, the above object is achieved by managing the gap formed between the inner surface of the shaft hole of the impeller and the outer surface of the shaft. In particular, the clearance relationship between the shaft hole diameter at the back plate side shaft hole diameter management part that contacts the inner surface of the shaft hole of the impeller and the boss side shaft hole diameter management part and the shaft diameter of the shaft that fits into the shaft hole. It has been shown that the occurrence of abnormal noise is prevented by setting it within a certain range.
Also. About the manufacturing method of the fiber reinforced resin impeller, shape | molding on predetermined | prescribed injection molding conditions is disclosed using the carbon fiber reinforced resin pellet.

  Moreover, in patent document 2, the compressor impeller 10 of the turbocharger is formed of fiber reinforced resin in FIGS. 1 to 4 of the document, and a plurality of compressor blades 26 are attached to the outer peripheral surface of the hub 12 extending in the axial direction. When the compressor blade 26 is shown to be formed of a resin containing continuous fibers 38, and the direction of the continuous fibers is oriented in the radial direction 25 of the rotating shaft (FIG. 2 of Patent Document 2), When oriented in a direction 29 along the direction of the outer peripheral surface of the hub (FIG. 3), when oriented in the combined direction (FIG. 4) is shown, the hub 12 is further composed of discontinuous fibers 32. It has been shown to be reinforced.

Japanese Patent No. 3018853 US Patent Application Publication No. 2012/0124994

However, although the above-mentioned Patent Document 1 discloses a fiber reinforced resin impeller, noise is prevented by managing a gap formed between the inner surface of the shaft hole of the impeller and the outer surface of the shaft. Technology. As for the production method, it is only disclosed that molding is performed under predetermined injection molding conditions using carbon fiber reinforced resin pellets, and it is shown that injection molding is performed using fiber reinforced resin of discontinuous fibers. It has only been done.
It is not disclosed to manufacture by combining with a fiber reinforced resin by continuous fibers.

  Patent Document 2 discloses a turbocharger compressor impeller made of a fiber reinforced resin. The compressor blade 26 includes a continuous fiber 38 oriented in a specific direction, and the hub 12 does not have a portion. Although it is formed including the continuous fiber 32, it is disclosed how to manufacture a part including the continuous fiber and a part including the discontinuous fiber as an integral resin product by a specific manufacturing method. It has not been.

  Therefore, the present invention has been made in view of such technical problems, and a rotating body of a fluid machine such as a blower, a compressor, or a pump that gives energy to a fluid, or a turbine or a turbine that receives energy from a fluid, is continuously provided. An object of the present invention is to provide a manufacturing method that can be manufactured by a hybrid composite material in which a fiber resin and a discontinuous fiber resin are combined, and that suppresses an increase in manufacturing steps and costs.

The present invention has been made to achieve such an object, and in a method of manufacturing a rotating body of a fluid machine including a blower, a compressor, a pump that gives energy to a fluid, or a water turbine and a turbine that receives energy from a fluid. ,
A part of the rotating portion of the rotating body is preformed with a continuous fiber resin made of a prepreg in which continuous fibers are impregnated with resin, and the preformed preform is placed in a mold of an injection molding machine. A step of managing and setting in a temperature range below the melting point of the continuous fiber resin, and a step of injecting the molten discontinuous fiber resin into the mold and fusing the preform with the discontinuous fiber resin; , Provided.

  According to this invention, since a part of the rotating part of the rotating body is molded by the continuous fiber resin made of the prepreg in which the continuous fiber is impregnated with the resin, the strength of the continuous fiber is improved and the discontinuous fiber resin is obtained. Therefore, weight reduction can be achieved.

In addition, since the preform is formed from a continuous fiber resin made of prepreg, it can be easily formed because sheet-like prepregs are stacked and tape-shaped prepregs are wound to form the preform.
In addition, since it is set in the mold of the injection molding machine in a temperature range lower than the melting point of the continuous fiber resin, positioning without failing to deform the shape of the preformed product, Insert becomes easy.

In the present invention, it is preferable that the temperature range in the mold when the preform is set in a mold is determined by the amount of heat of the melted discontinuous fiber resin injected into the mold. It is preferable to control the temperature at which the surface of the resin impregnated in is melted.
Thereby, in a metal mold | die, a preform can be reliably inserted and shape | molded in a part of rotary body of the fluid machine formed with discontinuous fiber resin, or the inside of a rotary body.

  Preferably, in the present invention, the rotating body is a scroll rotating body constituting a scroll compressor or a scroll expander, and a preform made of continuous fiber resin made of the prepreg is inserted into a part of the scroll wrap. It is good to mold.

  In this way, by inserting a preform made of continuous fiber resin made of the prepreg into a part of the scroll wrap, the scroll rotator is reduced in weight, the scroll wrap is prevented from falling, and a compression chamber or an expansion chamber is formed. In this case, it is possible to easily manufacture a scroll rotating body that has improved durability by preventing wear due to contact with the other side scroll wrap.

  Preferably, in the present invention, a preform made of continuous fiber resin made of the prepreg is molded to have a diameter larger or smaller than a spiral of the mold scroll wrap, and the preform is formed on the wall surface of the mold scroll wrap. It is good to set a molded product.

In this way, by forming the preform with a larger or smaller diameter than the spiral of the scroll wrap of the mold, the preform can be reliably attached to the wall surface forming the scroll wrap of the mold by the deformation force of the preform.
In other words, the preform is preformed so that the spiral diameter in the natural state is larger than the spiral outer peripheral wall surface of the mold, and is held on the spiral outer peripheral wall surface in the mold in a reduced diameter state. On the other hand, it is preformed so that the natural spiral diameter is smaller than the spiral inner peripheral wall surface, and is configured to be held on the spiral inner peripheral wall surface in the expanded state, thereby positioning separately. Even without using a jig or the like, it can be held in the mold in a stable state.

  Further, in the present invention, preferably, a contact portion provided at a location located at a wrap root portion of a preform made of continuous fiber resin made of the prepreg is used as an inlet portion of a cavity for molding the scroll wrap of the mold. The preform may be positioned so as to abut on the wall surface of the scroll wrap, and the discontinuous fiber resin may be supplied from the inlet side.

In this way, the abutting portion provided at the location positioned at the wrap root portion of the preform made of the continuous fiber resin made of the prepreg contacts the inlet portion of the cavity for molding the scroll wrap of the mold and scrolls. Since the preform is positioned along the wall surface of the wrap, the preform can be reliably set at a position along the inner peripheral wall surface or the outer peripheral wall surface of the scroll wrap.
Furthermore, since the discontinuous fiber resin is supplied from the inlet side of the cavity for molding the scroll wrap of the mold, the preform is stretched in the wrap height direction with the filling of the discontinuous fiber resin. Generation of wrinkles in the molded product can be prevented.

  Preferably, in the present invention, after the discontinuous fiber resin is injected into the mold, it further includes a step of taking out the product after cooling, and after taking out as a product, the scroll rotating body is rotated in combination with the master scroll. It is preferable to have a finishing process for finishing the product dimensions.

  In this way, the precision of product dimensions is improved by the finishing process in combination with the master scroll, so even if a preformed product made of continuous fiber resin made of prepreg is inserted into a part of the scroll wrap, positioning of the insert, Since the management of injection conditions does not have to be increased, manufacturing can reduce costs.

  Preferably, in the present invention, the rotating body is an impeller rotating body including a hub portion attached to a rotating shaft and a plurality of blade portions provided on an outer peripheral surface of the hub portion, the hub The part may be molded by inserting a preformed product of continuous fiber resin made of the prepreg.

  As described above, the rotating body can be applied to an impeller, and the hub constituting the impeller is molded by inserting a preformed product made of continuous fiber resin made of prepreg, thereby simplifying manufacturing. An impeller with reduced weight and strength can be manufactured.

  Pre-preg means that the resin has been impregnated in advance, and refers to an intermediate material that has been impregnated with the resin. Therefore, since the hub portion is constituted by the prepreg in which the continuous fiber is impregnated with the resin, it is easy to manufacture the hub portion made of the continuous fiber reinforced resin material.

  In the present invention, preferably, the hub portion is formed by laminating prepreg sheets in which continuous fibers are oriented in a plurality of directions along a plane perpendicular to the rotation axis in the rotation axis direction.

  Continuous fibers are oriented in multiple directions so as to intersect the plane perpendicular to the rotation axis, so that the strength of the hub is improved by acting in the direction that the continuous fibers increase the strength against centrifugal stress and circumferential stress. Can achieve high durability.

  In the present invention, preferably, the hub portion is further formed by winding a prepreg tape around the rotation axis so as to orient the continuous fibers in the circumferential direction.

Since the continuous fibers are oriented in the circumferential direction in this way, the rotational force acting on the hub portion and the stress due to the wing portion falling from the wing portion, and the thermal stress due to the heating by the compressed air of the compressor Thus, the strength of the entire hub can be improved.
Moreover, in order to orient the continuous fibers in the circumferential direction, a prepreg UD tape (unidirectional tape, Uni-Directional tape) can be easily installed by winding it around the rotation axis. .

  In the present invention, it is preferable that the rotating shaft is integrally formed with the discontinuous fiber resin together with the wing portion.

  In this way, the rotating shaft of the impeller rotor is integrally formed by injection molding along with the wing portion, so that it is not necessary to separately attach the rotating shaft to the impeller rotor. The number of assembly steps of the compressor and turbine provided can be reduced.

  In the present invention, preferably, the method further comprises a step of taking out the product after cooling after injection of the discontinuous fiber resin into the mold, and in the cooling step, the continuous fiber resin and the discontinuous fiber resin The mold temperature control corresponding to the continuous fiber resin and the discontinuous fiber resin may be performed so as to eliminate the difference in shrinkage due to cooling.

  As described above, after the injection of the discontinuous fiber resin into the mold, the method further includes a step of taking out the product after cooling, and a mold surface corresponding to the continuous fiber resin and the discontinuous fiber resin in the cooling step. Warping of the product can be prevented by controlling the temperature of the resin and eliminating the difference in shrinkage amount of each resin during cooling.

  According to the present invention, a hybrid that combines a continuous fiber resin and a discontinuous fiber resin in a rotating body of a blower, a compressor, a pump that gives energy to a fluid, or a fluid machine such as a water turbine or a turbine that receives energy from a fluid. It is possible to obtain a rotating body made of a composite material that can be manufactured using the composite material and that is lightweight and secures strength.

  In addition, a preformed product made of prepreg is set in a mold in a cold state (temperature lower than the melting point), inserted, and commercialized by injection molding. Thus, a rotating body made of a composite material that has been made stable and strong can be manufactured while suppressing an increase in manufacturing steps and costs.

BRIEF DESCRIPTION OF THE DRAWINGS It is principal part sectional drawing which shows 1st Embodiment of this invention and shows the whole structure of the scroll compressor which has a scroll rotary body. It is an expansion perspective view of the scroll rotary body (fixed scroll and turning scroll) of FIG. It is a schematic cross-sectional view of a fixed scroll and a turning scroll. It is AA and A'-A 'sectional drawing of FIG. It is explanatory drawing which shows the manufacturing method of a scroll rotary body. It is explanatory drawing which shows the manufacturing method of a scroll rotary body. It is explanatory drawing which shows the manufacturing method of a scroll rotary body. It is explanatory drawing which shows the manufacturing method of a scroll rotary body. It is explanatory drawing which shows the manufacturing method of a scroll rotary body. It is expansion explanatory drawing of the C section of FIG. 5C. It is a flowchart which shows the manufacture procedure of a scroll rotary body. It is a flowchart of the manufacturing method which shows 2nd Embodiment of this invention. It is explanatory drawing of 2nd Embodiment of this invention. It is a schematic block diagram which shows 3rd embodiment of this invention and shows temperature control of a metal mold | die. It is principal part sectional drawing which shows 4th Embodiment of this invention and shows the whole structure of the centrifugal compressor which has an impeller rotary body. It is explanatory drawing of the rear view (arrow Z direction view of FIG. 11) which looked at the hub part from the back side. It is description which shows the orientation of the continuous fiber which comprises a disk prepreg sheet member. It is explanatory drawing which shows the manufacturing method of an impeller rotary body. It is explanatory drawing which shows the manufacturing method of an impeller rotary body. It is explanatory drawing which shows the manufacturing method of an impeller rotary body. It is explanatory drawing which shows the manufacturing method of an impeller rotary body. It is explanatory drawing which shows the manufacturing method of an impeller rotary body. It is explanatory drawing which shows 5th Embodiment of this invention. It is explanatory drawing which shows 6th Embodiment of this invention.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. It should be noted that the dimensions, materials, shapes, relative arrangements, and the like of the components described in the following embodiments are not intended to limit the scope of the present invention unless otherwise specified, and are merely descriptions. It is just an example.

(First embodiment)
1st Embodiment demonstrates as an example the scroll rotary body which comprises a scroll compressor or a scroll expander as a rotary body of a fluid machine. In particular, a scroll rotor of a scroll compressor will be described.

  FIG. 1 is a cross-sectional view of a main part of the scroll compressor 1. The scroll compressor 1 includes a housing 3 constituting an outer shell, and a crankshaft 5 is supported in the housing 3 by a main bearing 7 and a sub-bearing 9 so as to be rotatable around a rotation center axis L thereof. An annular mechanical seal 11 is installed between the main bearing 7 and the sub-bearing 9 to seal the inside of the housing 3 with the atmosphere.

Further, one end side (left side in FIG. 1) of the crankshaft 5 penetrates the housing 3 and protrudes from one end side. On the other end side (right side in FIG. 1) of the crankshaft 5, a crankpin 13 that is eccentric by a predetermined distance from the rotation center axis L of the crankshaft 5 is integrally provided.
The orbiting scroll 21 is driven to rotate on the crankpin 13 via a drive bush 15, a floating bush 17, and a drive bearing 19.

In the housing 3, a fixed scroll 23 is arranged in addition to the orbiting scroll 21. As shown in FIG. 2, the fixed scroll 23 includes a substantially disc-shaped fixed end plate 25 and a fixed side wrap 27 erected vertically on one surface of the fixed end plate 25. The fixed side wrap 27 is formed in a spiral shape along an involute curve (stretching line) in plan view, and has a thick wall formed thicker than other scroll sections at the inner peripheral edge of the scroll. A section is formed.
A tip seal 29 a is embedded in the tip surface 29 of the fixed side wrap 27. A discharge port 25 </ b> A for discharging the compressed working gas to the back side of the fixed end plate 25 is formed at a substantially central position of the fixed scroll 23.

  As shown in FIG. 2, the orbiting scroll 21 includes a substantially disc-shaped orbiting end plate 31 and an orbiting side wrap 33 that stands vertically on one surface of the orbiting end plate 31. The turning side wrap 33 is obtained by reversing the shape of the fixed side wrap 27 by 180 degrees in the radial direction, and the rest is substantially the same as the fixed side wrap 27 except that the discharge port 25A is not provided. It has a common shape. A tip seal 35 a is embedded in the tip surface 35 of the turning side wrap 33.

  The fixed scroll 23 and the orbiting scroll 21 are meshed and assembled with their centers spaced apart by the orbiting radius and the phases of the fixed side wrap 27 and the orbiting side wrap 33 being shifted by 180 °. Thereby, the compression chamber 37 which is a sealed space is defined between the fixed side wrap 27 and the turning side wrap 33.

  The working gas introduced from the suction port 39 is introduced into the compression chamber 37 via the suction chamber 41 of FIG. Then, the orbiting scroll 21 does not rotate but revolves while maintaining a phase shift of 180 ° (revolving orbit), so that the volume of the compression chamber 37 gradually decreases. The sealed working gas is compressed. The compressed high-pressure gas is discharged to the outside through the discharge chamber 43 from the discharge port 25A. A rotation prevention mechanism 45 for preventing rotation of the orbiting scroll 21 is provided.

Both the fixed scroll 23 and the orbiting scroll 21 of the scroll compressor 1 are formed of resin.
FIG. 4 shows the cross-sectional shapes of the fixed scroll 23 and the orbiting scroll 21, and at least one of the fixed side wrap 27 and the orbiting side wrap 33 is laminated with at least one prepreg in which continuous fibers 47 are impregnated with resin. Thus, the prepreg sheet member 49 formed is inserted to form the continuous fiber portion 51.

  On the other hand, as shown in FIG. 4, the portions of the revolving end plate 31 and the fixed end plate 25 other than the prepreg sheet member 49 in the fixed side wrap 27 and the revolving side wrap 33 are made of resin of discontinuous fibers 53 of short fibers or long fibers. The discontinuous fiber portion 55 is formed by the discontinuous fiber resin coated with.

The prepreg has already been described, and is a molded intermediate product in which a reinforcing fiber is impregnated with a matrix resin, and generally has a sheet shape.
The following materials are used as the fiber material and the matrix resin material in the discontinuous fiber resin and the continuous fiber resin of the present invention.
As the reinforcing fiber, various inorganic fibers and organic fibers such as carbon fiber, aramid fiber, nylon fiber, high-strength polyester fiber, glass fiber, boron fiber, alumina fiber, silicon nitride fiber, or a combination thereof should be used. Can do. Among these, carbon fiber is particularly preferable from the viewpoint of excellent specific strength and specific elasticity.

In addition, as the matrix resin of the present invention, a thermoplastic resin and a thermosetting resin can be used.
Examples of the thermoplastic resin include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polyester such as liquid crystal polyester, polyolefin such as polyethylene, polypropylene, polybutylene, polyoxymethylene, polyamide, polyphenylene sulfide, Fluororesin such as polyketone, polyetherketone, polyetheretherketone, polyetherketoneketone, polyethernitrile, polytetrafluoroethylene, crystalline resin such as liquid crystal polymer, styrene resin, polycarbonate, polymethylmethacrylate , Polyvinyl chloride, polyphenylene ether, polyimide, polyamideimide, polyetherimide, polysulfone, polyether Sulfone, amorphous resins such as polyarylate, other phenolic resins, phenoxy resins. Examples of the thermosetting resin include epoxy resins, unsaturated polyester resins, vinyl ester resins, phenol (resole type) resins, urea / melamine resins, and polyimide resins. In addition, you may apply these copolymers, a modified body, and / or resin which blended these 2 or more types.

As the length of the fiber, the short fiber having an average fiber length of about 0.5 to 1 mm or the long fiber of about 1 to 10 mm is used for molding. And after shaping | molding, the orientation of these short fibers and long fibers does not have fixedness, but is oriented in arbitrary directions and has discontinuity.
On the other hand, the continuous fiber resin described above has a fiber length exceeding 10 mm and is continuously arranged with a certain orientation of fibers.

As the continuous fiber resin constituting the fixed scroll 23 and the orbiting scroll 21 as the scroll rotating body of this embodiment, specifically, the fiber is carbon fiber or glass fiber, and the matrix resin is polyamide, modified polyamide, or polyether. A combination of ether ketone and the like.
Further, as the discontinuous fiber resin, specifically, the fiber is carbon fiber or glass fiber, and the length is 0.5 to 9 mm, and the matrix resin is polyamide, modified polyamide, or poly A combination of ether ether ketone and the like.

FIG. 2 is a schematic cross-sectional view of a scroll portion in the fixed scroll and the orbiting scroll in the present embodiment.
The continuous fiber portion 51 is formed only on the abdominal surface side wrap surfaces 27a and 33a of both the fixed side wrap 27 and the turning side wrap 33, or the back side wrap surfaces 27b and 33b of both the fixed side wrap 27 and the turning side wrap 33. It is formed only on.
In the embodiment shown in FIG. 3, an example in which the continuous fiber portion 51 is formed only on the abdominal surface side wrap surfaces 27 a and 33 a of the fixed side wrap 27 and the turning side wrap 33 is shown.
In addition, since the continuous fiber part 51 can be arrange | positioned according to the position which inserts the prepreg sheet | seat member 49, it is only formed only in the abdominal surface side lap surfaces 27a and 33a or only in the back side lap surfaces 27b and 33b. Alternatively, they may be arranged on both sides.

  As shown in FIG. 3, when the continuous fiber portion 51 is formed only on the abdominal surface side wrap surfaces 27 a and 33 a of both the fixed side wrap 27 and the turning side wrap 33, The formed wrap surface (abdominal surface side wrap surfaces 27a and 33a in FIGS. 2 and 3) and the wrap surface on which the discontinuous fiber portion 55 is formed (rear surface wrap surfaces 27b and 33b in FIGS. 2 and 3) are brought into contact with each other. A resin-made scroll compressor 1 configured as described above is provided.

  Thus, the wrap surface (abdominal surface side wrap surfaces 27a and 33a of FIGS. 2 and 3) formed with the continuous fiber portion 51 and the wrap surface (FIG. 2) formed with the discontinuous fiber portion 55 during the revolution turning of the orbiting scroll 21. 3, the rear side wrap surfaces 27 b and 33 b) are in contact with each other, so that the resin on the discontinuous fiber portion 55 side is more easily worn. As described above, the discontinuous fiber portion 55 is configured to wear preferentially over the continuous fiber portion 51, so that the continuous fiber 47 of the continuous fiber portion 51 can be prevented from being cut due to wear. Since the continuous fiber portion 51 is required to exhibit higher strength than the discontinuous fiber portion 55, such a configuration is effective in improving the durability of the scroll member.

  The orientation of the continuous fiber 47 of the continuous fiber portion 51 may be the height direction of the fixed side wrap 27 and the swivel side wrap 33, the circumferential direction, a direction in which they are combined, or any other direction. It can be set according to.

  Moreover, when the continuous fiber part 51 is formed on the wrap surface, the prepreg sheet member 49 is held in the cavity of the mold as compared with the case where the continuous fiber part 51 is formed not inside the wrap surface but inside the wrap part. Can be easily positioned, so that it is excellent in manufacturability.

Next, the manufacturing method of the above fixed scroll 23 and the turning scroll 21 is demonstrated with reference to FIG.
As shown in the flowchart of FIG. 7, the flow of the entire manufacturing process starts with prepreg sheet cutting in step S1, and the prepreg sheet member 49 is cut into a predetermined shape. Next, in step 2, the cut prepreg sheet member 49 is preformed into an insert shape. Next, in step S3, the preformed prepreg sheet member 49 is set in the mold. At the time of this setting, preheating is applied to the prepreg sheet member 49 to facilitate setting, but the prepreg sheet member 49 is set in a cold state below the melting point. Thereafter, in step S4, pellets obtained by coating long fibers as discontinuous fibers with a resin are supplied to an injection molding machine, injected and filled in a mold as a molten resin, and held and cooled. In the next step S5, the mold is opened and the product is taken out.

Next, the process along the flow of the flowchart will be described in more detail.
First, as shown in FIG. 5A (corresponding to step S1 in the flowchart), a prepreg sheet raw material formed by laminating a predetermined number of prepreg sheet materials is cut into a predetermined shape. The cut shape is a developed shape of the prepreg sheet member 49 to be inserted, has a substantially rectangular shape, the length H2 corresponds to the entire wrap length, and the height H1 corresponds to the lap height. Moreover, the protrusion part V has shown the location corresponded to the bending part (contact part) 56 provided in the location located in the lap | root root part of FIG. 5A.

Next, as shown in FIG. 5B (corresponding to step S2 in the flowchart), a preform (preliminary product) 60 is formed in a spiral shape from the cut prepreg sheet member 49 by a roller 58 or the like.
Since the pre-formed product is formed using the prepreg sheet member 49 by cutting and rollers, the pre-formed product can be easily manufactured.

Next, as shown in FIG. 5C (corresponding to step S3 in the flowchart), the hollow portion 70 in which the prepreg sheet member 49 preformed in a spiral shape is defined in the mold (movable mold 64 and fixed mold 62). Arranged at a predetermined position. The cavity 70 at this time is in an atmosphere having a temperature lower than the melting point of the resin contained in the prepreg sheet member 49, and is managed so that the prepreg sheet member 49 is not deformed by melting the contained resin. ing.
For this reason, since it can position without deforming the shape of a preform, insert molding becomes easy.

  The cavity portion 70 includes a first cavity 70a corresponding to an end plate portion of the scroll rotator (the fixed end plate 25 of the fixed scroll 23 and the turning end plate 31 of the orbiting scroll 21) and a wrap portion (fixed scroll 23) of the scroll rotating body. And a second cavity (cavity for forming a scroll wrap) 70b corresponding to the fixed wrap 27 and the orbiting scroll 33 of the orbiting scroll 21).

As shown in FIG. 5C, the preformed prepreg sheet member 49 is held in the cavity portion 70 along the outer peripheral wall surface 71a of the second cavity 70b corresponding to the wrap.
5C is a longitudinal sectional view of the movable mold 64 and the fixed mold 62, and the left figure is a plan sectional view of the movable mold 64 viewed from the BB direction.

FIG. 6 shows an enlarged view of a portion C in FIG. 5C.
The prepreg sheet member 49 is inserted into the second cavity 70b of the cavity portion 70 in the mold with the bent portion 56 preformed. The one surface 56 a of the bent portion 56 is held by the cavity portion 70 in a state where it abuts on a part of the wall surface 71 c that defines the cavity portion 70. At this time, the cavity 70 is in a temperature atmosphere lower than the melting point of the resin contained in the prepreg sheet member 49, and the prepreg sheet member 49 is not deformed by melting the contained resin. .

  Thus, when the prepreg sheet member 49 is held in the hollow portion 70, the preformed bent portion 56 is used for positioning, so that the prepreg sheet member 49 can be stabilized without using a positioning jig or the like. Since it can hold | maintain in the cavity part 70 in the state which carried out, it is excellent in manufacturability.

  Further, as shown in FIG. 6, since the molten resin is injected from the other surface side 56b of the bent portion 56, the prepreg sheet member 49 positioned on one surface 56a of the bent portion 56 is moved or deformed by the injected molten resin. It is held in the cavity 70 in a stable state without any damage. Thus, the finished fixed scroll 23 (the orbiting scroll 21) has high dimensional accuracy and a low defective product rate.

Next, as shown in FIG. 5D (corresponding to step S4 in the flowchart), the movable mold 64 is moved toward the fixed mold 62, and the fixed mold 62 is closed. And in the state which sealed the cavity part 70, the molten resin 60A is inject | emitted from the fixed metal mold | die 62 side toward the cavity part 70 via the sprue 62a. The injected molten resin 60A includes the above-described discontinuous fibers 53 having a length of less than 10 mm. The discontinuous fibers 53 included in the injected molten resin 60 </ b> A are oriented in an arbitrary direction in the hollow portion 70. The surface of the resin contained in the prepreg sheet member 49 is melted by the amount of heat of the injected molten resin 60A, and the prepreg sheet member 49 is fused and inserted with the molten resin.
Accordingly, when the preformed prepreg sheet member 49 is set in the mold, the temperature range in the cavity 70 in the mold is a temperature atmosphere lower than the melting point of the resin contained in the prepreg sheet member 49 as described above. The temperature of the resin contained in the prepreg sheet member 49 is controlled to a temperature at which the resin is contained by the heat amount of the molten resin 60A injected into the mold. This is obtained and managed in advance by calculation or the like at an appropriate temperature.

  Thereafter, as shown in FIG. 5E (corresponding to step S5 in the flowchart), after the molten resin 60A is cured, the movable rotary die 64 is separated from the fixed die 62, and the completed scroll rotating body (the fixed scroll 23 and the swivel) is completed. Take out the scroll 21). When the molten resin 60A to be injected is a thermoplastic resin, the molten resin 60A is cured by cooling the cavity 70. When the molten resin to be injected is a thermosetting resin, the molten resin may be cured by heating the cavity. The cured molten resin 60A constitutes the discontinuous fiber portion 55 of the scroll rotating body. Further, the cured prepreg sheet member 49 constitutes a continuous fiber portion 51 of the scroll rotating body.

  Thus, in the first embodiment, the discontinuous fiber portion 55 is in a state where the preformed prepreg sheet member 49 is held at a predetermined position of the cavity portion 70 formed by the fixed mold 62 and the movable mold 64. Thus, it is formed by injecting a molten resin 60 </ b> A containing the discontinuous fiber 53 into the cavity 70. According to such an embodiment, the resin scroll rotary body (the fixed scroll 23 and the orbiting scroll 21) can be manufactured by so-called insert molding using the preformed prepreg sheet member 49 as an insert.

Further, as described above, by holding the prepreg sheet member 49 along the outer peripheral wall surface 71a of the second cavity 70b, the scroll rotary body (fixed scroll) in which the continuous fiber portion 51 is formed on the back side wrap surfaces 27b and 33b. 23 and orbiting scroll 21) can be formed.
As compared with the case where the prepreg sheet member 49 is held between the outer peripheral wall surface 71a and the inner peripheral wall surface 71b of the second cavity 70b, the prepreg sheet member 49 can be positioned easily.

  For example, the prepreg sheet member 49 is preformed such that the vortex diameter in the natural state is larger than the spiral outer peripheral wall surface 71 a that defines the second cavity 70 b in the movable mold 64, and the prepreg sheet member 49 The prepreg sheet member 49 can be held in the cavity 70 in a stable state without using a separate positioning jig or the like. It becomes.

  Further, by holding the prepreg sheet member 49 along the inner peripheral wall surface 71b of the second cavity 70b, the scroll member (the fixed scroll 23 and the swivel) in which the continuous fiber portion 51 is formed on the abdominal surface side lap surfaces 27a and 33a. A scroll 21) can be formed. Also in this case, as in the case described above, the prepreg sheet member 49 can be easily positioned as compared with the case where the prepreg sheet member 49 is held between the outer peripheral wall surface 71a and the inner peripheral wall surface 71b of the second cavity 70b. It can be carried out.

  For example, the prepreg sheet member 49 is preformed so that the natural spiral diameter is smaller than the spiral inner peripheral wall surface 71b defining the second cavity 70b in the movable mold 64, and the prepreg sheet member 49 is By being configured to be held in the hollow portion 70 in the expanded state, the prepreg sheet member 49 can be held in the hollow portion 70 in a stable state without using a positioning jig or the like separately. Become.

  Further, in the present embodiment, as shown in FIG. 6, the prepreg sheet member 49 is provided with a bent portion 56 so as to come into contact with the inlet portion of the cavity portion 70 corresponding to the wrap root portion, so that the cavity portion 70 of the mold is Since the prepreg sheet member 49 is positioned along the wall surface, the prepreg sheet member 49 can be held in the cavity 70 in a stable state.

  Furthermore, as shown in FIG. 6, since the molten resin is injected from the other surface side 56b of the bent portion 56, the prepreg sheet member 49 positioned on the one surface 56a of the bent portion 56 is moved or deformed by the injected molten resin. It is held in the cavity portion 70 in a stable state without being damaged. Furthermore, since the prepreg sheet member 49 is stretched in the height direction of the wrap as the discontinuous fiber resin is filled, the generation of wrinkles is prevented. Thus, the finished fixed scroll 23 (the orbiting scroll 21) has high dimensional accuracy and a low defective product rate.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS.
In the second embodiment, the wrap portion of the scroll rotating body taken out after the injection molding is polished to improve the dimensional accuracy.

As shown in the flowchart of FIG. 8, steps S11 to S15 are the same as steps S1 to S5 of the first embodiment, and step S16 is added.
This step S16 is a finished process of the molded product, and the finished molded product is dimensionally finished.
As shown in FIG. 9, at least one of the fixed side wrap 27 and the turning side wrap 33, and a spiral grindstone surface formed corresponding to the finished shape of the lap surface in the fixed side wrap 27 and the turning side wrap 33. In a state where the master scroll 80 having 84a and 84b is slidably engaged, the two are relatively rotated.

  That is, the grindstone surface 84a oriented on the outer peripheral side of the master scroll 80 is formed in a spiral shape corresponding to the finished shape of the belly surface side wrap surfaces 27a and 33a of the scroll member. On the other hand, the grindstone surface 84b oriented on the inner peripheral side of the master scroll 80 is formed in a spiral shape corresponding to the finished shape of the back side wrap surfaces 27b and 33b of the scroll member. Then, by turning both relatively, the lapping surface of the scroll member is polished into a finished shape by the grindstone surfaces 84 a and 84 b of the master scroll 80.

  According to such an embodiment, since the wrap surface can be polished by relatively turning at least one of the fixed side wrap 27 and the turning side wrap 33 and the master scroll 80, Since the dimensional accuracy is improved, the insert accuracy of the prepreg sheet member 49 and the injection molding accuracy of the discontinuous fiber resin need not be required to be high, so that the manufacturing cost can be reduced and the productivity is excellent.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG.
As shown in FIG. 10, in the second cavity 70b of the mold for molding the wrap portion, a surface 91A in contact with the continuous fiber portion 51 side on which the continuous fiber resin is formed, and a surface 91B in contact with the discontinuous fiber portion 55 side. Are provided with mold temperature adjusting means 93 for controlling the mold temperature.
For example, electric heaters 95A and 95B are embedded along each surface. Based on the thermal expansion coefficient of the matrix resin of the continuous fiber resin and the linear expansion coefficient of the matrix resin of the discontinuous fiber resin, the continuous fiber resin and the discontinuous fiber resin are injected after the discontinuous fiber resin is injected into the movable mold 64. And a control device 97 for controlling the temperature of the mold so as to eliminate the difference in shrinkage due to cooling.
The controller 97 controls the cooling rate by heating with a heater so that the cooling using the resin material having a large thermal contraction rate is gradually lowered.

Thus, in the process of taking out the product after cooling after injection of the discontinuous fiber resin into the mold (movable mold 64, fixed mold 62), the mold corresponding to the continuous fiber resin and the discontinuous fiber resin. Since the wall surface temperature of the second cavity 70b of the mold is controlled to eliminate the difference in the shrinkage amount of each resin during cooling, warping of the fixed side wrap 27 and the turning side wrap 33 can be prevented.
That is, the verticality of the turning side wrap 33 standing upright on the turning end plate 31 and the perpendicularity of the fixed side wrap 27 standing upright on the fixed end plate 25 can be accurately manufactured. Can be improved.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG.
The first embodiment to the third embodiment have been described as examples of the scroll rotator as described above. However, the fourth and subsequent embodiments will be described using the impeller rotator as an example.
FIG. 11 shows an impeller 101 of a fluid machine, and the impeller 101 is an example of an impeller of a centrifugal compressor of an exhaust turbocharger provided in an engine.
In FIG. 11, the centrifugal compressor (compressor) 103 of the exhaust turbocharger is configured such that the rotational force of a turbine rotor (not shown) driven by the exhaust gas of the engine is transmitted via a rotating shaft 105.

  In the centrifugal compressor 103, an impeller 101 is supported in a compressor housing 109 so as to be rotatable about a rotation axis M of a rotation shaft 105. An intake passage 111 that guides intake gas before being compressed, for example, air, to the impeller 101 extends in the direction of the rotation axis M and concentrically in a cylindrical shape. An intake port 113 connected to the intake passage 111 opens at the end of the intake passage 111.

  A diffuser 115 extending in a direction perpendicular to the rotation axis M is formed outside the impeller 101, and a spiral air passage 117 is provided on the outer peripheral side of the diffuser 115. The spiral air passage 117 forms an outer peripheral portion of the compressor housing 109.

  Further, the impeller 101 is provided with a hub portion 119 that is driven to rotate about the rotation axis M, and a plurality of blade portions 121 on the outer peripheral surface of the hub portion 119. A metal rotating shaft 105 is press-fitted and coupled to the inner peripheral hole 120 of the hub portion 119.

The wing 121 is driven to rotate and sucks air from the intake port 113 and compresses the air that has passed through the intake passage 111. The shape is not particularly limited. For this reason, it may be a splitter blade in which short blades and long blades are implanted.
Further, the wing 121 has a front edge 121a which is an upstream edge, a rear edge 121b which is a downstream edge, and an outer peripheral edge (outer peripheral part) 121c which is a radially outer edge. The outer peripheral edge 121 c is formed as a side edge portion covered with the shroud portion 123 of the compressor housing 109. And the outer periphery 121c is arrange | positioned so that the vicinity of the inner surface of the shroud part 123 may be passed.

  The impeller 101 of the compressor 103 is rotationally driven about the rotational axis M by the rotational driving force of the rotational shaft 105. Then, outside air is drawn in from the air inlet 113 and flows between the plurality of blade parts 121 of the impeller 101, and after the dynamic pressure is mainly increased, it flows into the diffuser 115 disposed on the radially outer side. Then, a part of the dynamic pressure is converted into a static pressure, the pressure is increased, and the dynamic pressure is discharged through the spiral air passage 117. Then, pressurized air is supplied to the internal combustion engine.

As described above, the impeller 101 includes the hub portion 119 that is attached to the rotating shaft 105 and is rotated, and a plurality of blade portions 121 that are provided on the outer peripheral surface of the hub portion 119. The part 121 forms the discontinuous fiber part 129 by a discontinuous fiber resin obtained by coating the discontinuous fibers 122 of short fibers or long fibers with a resin.
The hub portion 119 is formed by inserting a prepreg sheet member 125a and a prepreg tape member 125b formed by laminating at least one or more layers of prepreg impregnated with resin into continuous fibers 124 (124a and 124b). The continuous fiber portion 151 is formed.
The discontinuous fiber portion 129 and the continuous fiber portion 151 are the same as the discontinuous fiber portion 55 and the continuous fiber portion 51 already described in the first embodiment, and the above-described examples of the matrix resin and the fiber material are used.

  As shown in FIG. 11, the portion of the hub portion 119 of the impeller 101 includes a prepreg sheet member 125a and a prepreg formed by laminating at least one layer of prepreg impregnated with resin into continuous fibers 124 (124a and 124b). It is formed by a continuous fiber portion 151 into which a tape member 125b is inserted.

A portion of the back plate 131 of the hub portion 119 is formed by a prepreg sheet member 125a formed in a disk shape. And this prepreg sheet member 125a formed in a disk shape has, for example, carbon fibers in four directions so as to intersect the direction of linear continuous fibers 124a indicated by L1 to L4 in FIG. Oriented and formed.
The orientation of fibers in the prepreg material sheet when the disk-shaped prepreg sheet member 125a is formed by stacking a plurality of prepreg material sheets, even if they are woven into a mesh or are not woven. May be overlapped so as to intersect each other in the 45 ° direction.
In addition, as for the orientation, it is only necessary to be arranged in four directions at least in the 45 ° direction, and fibers intersecting at a narrower angle than this may be further arranged to have orientations in four or more directions.

  Further, the portion of the hub portion 119 other than the back plate 131 is oriented in the direction of the continuous fiber 124b in the circumferential direction indicated by L5 in FIG. It is formed by winding a prepreg tape member made of at least one layer of prepreg tape in which a continuous fiber 124b in the circumferential direction is impregnated with resin around the rotating shaft 105.

Thus, since the impeller 101 is formed by combining the resin containing discontinuous fibers and the resin containing continuous fibers, a lightweight and high-strength impeller can be formed.
Further, the disc-shaped prepreg sheet member 125a constituting the back plate 131 has four-direction orientations in which the continuous fibers intersect at least 45 ° on the plane perpendicular to the rotation shaft 105, respectively. With respect to the stress and the circumferential stress, the continuous fiber acts in the direction of increasing the strength, so that the strength of the back plate 131 and the entire hub portion 119 can be improved, and high durability can be realized.

FIG. 12 shows a rear view of the back plate 131 of the hub portion 119 shown in FIG. As shown in FIG. 12, the circumferential stress is large due to the rotational force from the rotating shaft 105 acting on the center side of the hub portion 119, the radial stress due to centrifugal force is large at the central portion, and the root of the blade is on the outer circumferential side. The stress in the circumferential direction appears greatly due to the influence of the wings falling down. As described above, since stresses in various directions coexist, the strength of the back plate 131 is ensured by having an arrangement in four directions so as to intersect at least 45 ° on the right angle surface of the rotating shaft 105 in order to secure the strength. Can be carried out effectively.
In particular, since the outer periphery of the back plate 131 has a shape in which the outer diameter of the hub portion 119 is the largest, reinforcing the back plate 131 portion with the continuous fiber portion 151 to increase the strength improves the strength of the hub portion 119 as a whole. It is effective.

Next, a method for manufacturing such an impeller 101 will be described with reference to FIGS.
The main flow of the manufacturing method is the same as that already described in the flowchart of FIG.
As shown in FIG. 14A (corresponding to step S1 in the flowchart), first, from a prepreg sheet member 125 formed by overlapping a plurality of prepreg material sheets so that the fiber direction is in a predetermined direction, a predetermined diameter is obtained. Cutting is performed on the disk-shaped prepreg sheet member 125a. Cut out one or more diameters along the shape of the back plate 131.
At the same time, a prepreg tape member 125b made of at least one layer of prepreg tape in which the continuous fibers 124 are impregnated with resin is prepared so as to be wound around the rotating shaft 105 so that the continuous fibers are oriented in the circumferential direction.

  The prepreg sheet member 125a specifically includes a plurality of prepreg material sheets (for example, a thickness of 15 to 500 μm) formed by impregnating a continuous carbon fiber with a thermoplastic resin, and the fiber direction is a predetermined direction. Are formed so as to be oriented so as to have a certain thickness (for example, 0.5 to 4.5 mm).

Next, as shown in FIG. 14B (corresponding to step S2 in the flowchart), the hub portion 119 is preformed (preliminarily molded).
First, the prepreg tape member 125b is wound around a jig corresponding to the rotation axis. Next, the shape is cut by machining so as to fit the outer shape of the hub portion 119. Next, the portion of the back plate 131 formed by the disk-shaped prepreg sheet member 125a is inserted into a jig corresponding to the rotation shaft. Next, the disk-shaped prepreg sheet member 125a portion of the back plate 131 and the prepreg tape member 125b portion other than the back plate 131 are overlapped and integrated by hot pressing, and a preform (preliminary molded product) 110 is obtained. Manufacturing.

  Even if this preform is manufactured in a separate process, the portion of the back plate 131 in the mold 130 (movable mold 130a, fixed mold 130b) of the injection molding machine 128 is set in the next mold. In addition, the other portions may be set in an overlapping manner, and the pressure may be reduced from the back side, and the movable mold 130a may be moved and clamped to perform preform (preliminary molding) in the mold (FIG. 14C). (The drawing shows the outline when preforming in a mold).

  Next, as shown in FIG. 14C (corresponding to step S3 in the flowchart), the hub portion 119 formed in the mold 130 or the continuous fiber resin preformed in a separate process is set in the mold 130. . In this setting, by keeping the temperature in the mold below the melting point of the matrix resin of the continuous fiber resin, positioning can be ensured without deforming the shape of the preform in the mold. Molding becomes possible.

Next, as shown in FIG. 14D (corresponding to step S4 in the flowchart), the movable mold 130a is moved toward the fixed mold 130b, and the fixed mold 130b is closed. In a sealed state, the molten resin 134 is injected from the fixed mold 130b side through the sprue 132 toward the cavity. The injected molten resin 134 includes the above-described discontinuous fibers 122 having a length of less than 10 mm.
The discontinuous fibers 122 included in the injected molten resin 134 are oriented in an arbitrary direction in the cavity.

Finally, as shown in FIG. 14E (corresponding to step S5 in the flowchart), after the molten resin 134 is cured, the movable body 130a is separated from the fixed mold 130b to complete the rotating body of the impeller 101. Take out.
When the injected molten resin 134 is a thermoplastic resin, the molten resin 134 is cured by cooling the cavity. When the molten resin to be injected is a thermosetting resin, the molten resin may be cured by heating the cavity. The cured molten resin 134 constitutes the discontinuous fiber portion 129 of the scroll rotating body. Further, the cured prepreg sheet member 125a constitutes a continuous fiber portion 151 of the back plate 131 of the hub portion 119, and the cured prepreg tape member 125b constitutes a continuous fiber portion 151 other than the back plate 131 portion of the hub portion 119. To do.

  As described above, the melted resin containing the discontinuous fiber 122 in the cavity portion in a state where the hub portion 119 having the preformed discontinuous fiber portion 129 is held at a predetermined position of the cavity portion in the molds 130a and 130b. The impeller 101 is formed by injecting 134.

The hub part 119 is formed by laminating the prepreg sheet member 125a in the direction of the rotation axis, and is formed by winding the prepreg tape member 125b around the rotation axis, so that the hub part 119 can be easily manufactured using a continuous fiber resin. Become.
Further, since the wing part 121 is manufactured by injection molding using a discontinuous fiber resin of long fibers, it is possible to manufacture even the complicated shape of the wing part 121, and manufacture of the wing part 121 with ensured strength. Is easily done.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIG.
As shown in FIG. 15, the orientations of the continuous fiber resin constituting the hub portion 133 are all formed by the prepreg sheet member 125 a oriented in the direction perpendicular to the rotation axis M of the rotation shaft 105.
In the manufacturing method, when the preform of FIG. 14B is created, the entire hub portion 119, that is, the entire axial direction is formed by laminating a plurality of disc-shaped prepreg sheet members 125a having different diameters in the rotation axis direction. . For this reason, manufacture becomes easy.
Further, the linear continuous fibers 124 a have four orientations at least at 45 ° in the plane perpendicular to the rotation axis 105.
The disk-shaped prepreg sheet member 125a can improve the strength of the back plate 131 and further the entire hub portion 119 by acting in a direction in which the continuous fibers 124a increase the strength against centrifugal stress and circumferential stress. High durability can be realized.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIG.
As shown in FIG. 16, the rotating shaft 135 is integrally formed at the time of injection molding in the mold by the tip end portion 136 a of the hub portion 136, the wing portion 121, and the discontinuous fiber 122 to form an integral rotating shaft.

  In this way, the rotating shaft 135 and the hub portion 136 are integrally formed and integrated, so that it is not necessary to separately perform an attaching operation such as press fitting of the rotating shaft to the impeller, and a compressor equipped with the impeller, Turbine assembly man-hours can be reduced.

  According to the present invention, a rotating body of a fluid machine, in particular, a scroll rotating body and an impeller can be manufactured by a hybrid composite material in which continuous fiber resin and discontinuous fiber resin are combined, and a composite material that secures weight reduction and strength. Since a manufactured rotating body can be obtained, it is suitable for plasticizing a rotating body of a blower, a compressor, a pump, or a fluid machine such as a water turbine or a turbine.

1 Scroll compressor (fluid machine)
23 Fixed scroll (scroll rotating body)
21 Orbiting scroll (scroll rotating body)
27 Fixed side wrap (scroll wrap)
33 Turning side lap (scroll lap)
27a, 33a Abdominal surface side wrap surface 27b, 33b Back surface side wrap surface 49 Prepreg sheet member 47, 124 (124a, 124b) Continuous fiber 51, 151 Continuous fiber portion 53, 122 Discontinuous fiber 55, 130 Discontinuous fiber portion 56 Bending portion (Contact part)
60, 110 Preform (Preliminary product)
62, 130b Fixed mold 64, 130a Movable mold 80 Master scroll 84a, 84b Grinding wheel surface 101 Impeller (impeller rotor)
103 Centrifugal compressor (fluid machine)
105, 135 Rotating shaft 119, 133, 136 Hub part 120 Inner peripheral hole 121 Wing part 125 Pre-preg member (prepreg)
125a, 49 Pre-preg sheet member 125b Pre-preg tape member 130 Mold 131 Back plate 135 Rotating shaft L1-L4 Orientation of linear continuous fiber
L5 Circumferential continuous fiber orientation

Claims (7)

A method for manufacturing a scroll rotating body of a scroll fluid machine, comprising: an end plate portion; and a lap portion erected on one surface of the end plate portion,
A preforming step of preforming a prepreg sheet member made of a continuous fiber resin in which a continuous fiber is impregnated with a resin into a spiral shape;
A first cavity having a space corresponding to the end plate portion of the scroll rotator, and a second cavity communicating with the first cavity and having a space corresponding to the lap portion of the scroll rotator. A preparatory step of preparing a mold that internally defines a cavity including a cavity;
A setting step of setting the preformed prepreg sheet member in the second cavity in the mold managed in a temperature range lower than the melting point of the resin impregnated in the continuous fibers;
Then, an injection step of injecting the melted discontinuous fiber resin into the cavity in the mold and fusing the preformed prepreg sheet member with the discontinuous fiber resin is provided. A method for manufacturing a scroll rotating body of a scroll fluid machine.   The temperature range in the mold when the prepreg sheet member is set in the second cavity of the mold is determined by the amount of heat of the melted discontinuous fiber resin injected into the cavity in the mold. The method for manufacturing a scroll rotating body of a scroll fluid machine according to claim 1, wherein the temperature of the resin impregnated in the continuous fibers is controlled to a temperature at which the resin is melted. The pre- forming step further includes a large-diameter forming step of forming the prepreg sheet member such that the spiral diameter in the natural state is larger than the spiral shape of the second cavity,
The setting step includes a holding step of holding the prepreg sheet member formed by the large-diameter forming step along the outer peripheral wall surface of the second cavity in a reduced diameter state. Item 3. A method for manufacturing a scroll rotor of a scroll fluid machine according to Item 1 or 2. The pre- forming step further includes a small-diameter forming step of forming the prepreg sheet member such that the natural spiral diameter is smaller than the spiral shape of the second cavity.
The setting step includes a holding step of holding the prepreg sheet member formed by the small diameter forming step along the inner peripheral wall surface of the second cavity in an expanded state. A method for manufacturing a scroll rotating body of the scroll fluid machine according to 1 or 2. The prepreg sheet member is
A main body portion that is held along the outer peripheral wall surface or the inner peripheral wall surface of the second cavity, and a direction orthogonal to the outer peripheral wall surface or the inner peripheral wall surface from an end portion of the main body portion. Extending bends, and
The setting step includes a positioning step of positioning the prepreg sheet member by bringing one surface (56a) of the bent portion into contact with a wall surface (71c) of an inlet portion of the second cavity in the mold,
In the injection step, the discontinuous fiber resin is supplied from the inlet side toward the inside of the second cavity by injecting the molten discontinuous fiber resin into the first cavity. A method for manufacturing a scroll rotating body of a scroll fluid machine according to claim 3 or 4.   After the injection step, the method further includes a step of taking out the scroll rotator from the mold, and a finishing step of finishing the product dimensions by rotating the scroll rotator taken in combination with a master scroll. The method for manufacturing a scroll rotating body of a scroll fluid machine according to any one of claims 1 to 5.   After the injection step, the method further includes a step of removing the scroll rotating body from the mold, and in the step of removing, the difference in shrinkage due to cooling between the continuous fiber resin and the discontinuous fiber resin is eliminated. The method for manufacturing a scroll rotating body of a scroll fluid machine according to any one of claims 1 to 6, wherein mold temperature control corresponding to the continuous fiber resin and the discontinuous fiber resin is performed.

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