US20170151608A1 - Method for producing compressor housing - Google Patents

Method for producing compressor housing Download PDF

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Publication number
US20170151608A1
US20170151608A1 US15/296,333 US201615296333A US2017151608A1 US 20170151608 A1 US20170151608 A1 US 20170151608A1 US 201615296333 A US201615296333 A US 201615296333A US 2017151608 A1 US2017151608 A1 US 2017151608A1
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United States
Prior art keywords
outlet
cylindrical portion
projecting
compressor housing
projecting portion
Prior art date
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Abandoned
Application number
US15/296,333
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English (en)
Inventor
Tomoyuki Isogai
Tetsuya Niwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Otics Corp
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Otics Corp
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Filing date
Publication date
Application filed by Otics Corp filed Critical Otics Corp
Assigned to OTICS CORPORATION reassignment OTICS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISOGAI, TOMOYUKI, NIWA, TETSUYA
Publication of US20170151608A1 publication Critical patent/US20170151608A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/422—Discharge tongues
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4253—Fan casings with axial entry and discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/40—Application in turbochargers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/21—Manufacture essentially without removing material by casting

Definitions

  • the present invention relates to a method for producing a compressor housing for a turbocharger.
  • Turbochargers which are mounted in an automobile for example, are configured to compress intake air in the compressor and discharge the compressed air to the internal-combustion engine.
  • a scroll chamber into which the compressed air discharged from the impeller flows is provided on the air flow path formed within the compressor housing, the scroll chamber guides the compressed air to an outlet port, and the compressed air is discharged to the internal-combustion engine side through the outlet port.
  • the shape of the scroll chamber in particular greatly affects the performance of the compressor, and therefore it is necessary to form the shape suitably so as to conform to the performance requirements.
  • forming a compressor housing by gravity casting or low pressure casting may be conceived.
  • These methods can implement casting using the so-called core and therefore provides enhanced geometric flexibility to be able to address complex shapes.
  • the casting cycle lasts a long time and therefore the productivity is low, and since the core or another part is necessary, the cost is high.
  • a sand mold is used for example, there is another problem in that the surface roughness increases and therefore the efficiency of the compressor decreases.
  • die casting is also known as a method for forming a compressor housing.
  • the casting cycle is shorter than in gravity casting or low pressure casting and therefore the productivity is higher and the cost is lower.
  • die casting can form only such shapes that can be pulled from the mold (i.e. shapes not including an undercut), and therefore has low geometric flexibility and cannot address complex shapes.
  • JP-A-2014-62492 there has been proposed a compressor housing constructed by assembling a scroll piece and a shroud piece, each formed as a discrete part, to each other. This is intended to ensure the geometric flexibility of the scroll chamber of the compressor housing while allowing each piece to be of a shape that can be easily formed by die casting.
  • Patent Document 1 JP-A-2014-62492
  • the outlet port is provided so as to extend from the scroll chamber in the direction tangential to the circumferential direction.
  • the mold structure is complex and the production process is complex and thus the production cost increases.
  • the shape of the outlet port affects the performance of the compressor and also affects its mountability to the vehicle engine room. Thus, it is not desirable to place priority only on ease of coring out when designing the shape of the compressor housing.
  • the present invention has been made in view of the foregoing problems and is intended to provide a method for producing a readily producible compressor housing for a turbocharger.
  • One aspect of the present invention is a method for producing a compressor housing for a turbocharger, the compressor housing being able to house an impeller,
  • the compressor housing including: an inlet port formed adjacent to a front side of the impeller, the inlet port opening to a front side in an axial direction; a scroll chamber formed on an outer circumferential side of the impeller in a circumferential direction; an outlet port on an outer circumferential side of the inlet port, the outlet port opening to the front side in the axial direction; and an outlet communicating section communicating between the outlet port and the scroll chamber,
  • the compressor housing being constructed by assembling a scroll piece and a shroud piece, each formed as a discrete part, together in the axial direction,
  • the scroll piece including: an inlet cylindrical portion making the inlet port and having a through hole in the axial direction; a front side wall section on an outer circumferential side of the inlet cylindrical portion, the front side wall section making a front area of a wall surface of the scroll chamber; and an outlet cylindrical portion extending from a region in a circumferential direction of the front side wall section, the outlet cylindrical portion making the outlet communicating section and the outlet port,
  • the outlet cylindrical portion being configured such that an inner wall surface of the outlet communicating section is curved so as to smoothly connect between an inner wall surface of the scroll chamber and an inner wall surface of the outlet port,
  • the shroud piece including: a shroud press-fit portion in a cylindrical shape to be press-fitted into the inlet cylindrical portion; an inner circumferential wall section making an inner circumferential area of the wall surface of the scroll chamber; a shroud surface opposed to the impeller; and a diffuser surface extending from the shroud surface toward the scroll chamber,
  • the method including: a die casting step forming an intermediate formed body by die casting, the intermediate formed body having a residue portion including a metal material left within the outlet cylindrical portion, the die casting using a back mold having a first projecting portion projecting toward the front side and a front mold having a second projecting portion projecting toward a back side, the front mold being movable back and forth relative to the back mold in the axial direction; and
  • a cutting and removal step removing the residue portion in the intermediate formed body by cutting so as to obtain the scroll piece, wherein, in the die casting step, both the first projecting portion and the second projecting portion are disposed within the outlet cylindrical portion.
  • the method for producing a compressor housing includes the die casting step and the cutting and removal step.
  • die casting is performed using the back mold and the front mold that are movable back and forth relative to each other in the axial direction. Furthermore, the die casting is performed in such a manner that the first projecting portion of the back mold and the second projecting portion of the front mold are positioned within the outlet cylindrical portion. This makes it possible to form, by die casting, an intermediate formed body having a shape close to the final shape of the scroll piece without using a core or the like.
  • the residue portion in the intermediate formed body is removed by cutting in the cutting and removal step, and thereby the scroll piece can be readily produced.
  • FIG. 1 is a plan view, as viewed from the front side, of a compressor housing according to Embodiment 1 with a seal plate assembled thereto;
  • FIG. 2 is a cross-sectional view, taken along a line III-III in FIG. 1 illustrating the compressor housing according to Embodiment 1 with an impeller mounted therein;
  • FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 ;
  • FIG. 4 is a cross-sectional view taken along a line IV-IV in FIG. 1 ;
  • FIG. 5 is a cross-sectional view taken along a line V-V in FIG. 1 ;
  • FIG. 6 presents perspective views of a scroll piece, shroud piece, and seal plate according to Embodiment 1;
  • FIG. 7 is a cross-sectional illustration depicting a die casting step according to Embodiment 1;
  • FIG. 8 is a cross-sectional illustration, taken along a line VIII-VIII in FIG. 7 depicting a first projecting portion, second projecting portion, and outlet cylindrical portion according to Embodiment 1;
  • FIG. 9 is another cross-sectional illustration depicting the die casting step according to Embodiment 1;
  • FIG. 10 is a cross-sectional illustration depicting a state after coring out in the die casting step according to Embodiment 1;
  • FIG. 11 is a cross-sectional view of an intermediate formed body according to Embodiment 1;
  • FIG. 12 is a perspective view of the intermediate formed body according to Embodiment 1;
  • FIG. 13 is a perspective view of the scroll piece according to Embodiment 1;
  • FIG. 14 is a cross-sectional view of the scroll piece according to Embodiment 1;
  • FIG. 15 is a plan view of the scroll piece according to Embodiment 1 as viewed from the back side;
  • FIG. 16 is a cross-sectional view of the compressor housing according to Embodiment 1;
  • FIG. 17 is a cross-sectional illustration depicting a die casting step according to Embodiment 2;
  • FIG. 18 is a cross-sectional illustration, taken along a line XVIII-XVIII of FIG. 17 depicting a first projecting portion, second projecting portion, and outlet cylindrical portion according to Embodiment 2;
  • FIG. 19 is a cross-sectional view of an intermediate formed body according to Embodiment 2.
  • circumferential direction refers to the rotational direction of the impeller and the term “axial direction” refers to the direction of the rotation axis of the impeller.
  • front refers to the side on which the inlet port opens in the axial direction and the term “back” refers to the opposite side.
  • the first projecting portion and the second projecting portion are preferably abutted against each other.
  • the volume of the residue portion in the intermediate formed body can be reduced and therefore the man-hours in the cutting and removal step can be reduced.
  • the intermediate formed body preferably has the residue portion only partly existing on the inner wall surface of the outlet cylindrical portion.
  • the area to be cut in the inner wall surface of the outlet cylindrical portion in the cutting and removal step can be reduced. As a result, it is possible to further improve the productivity for producing compressor housings.
  • the first projecting portion has a first projecting mold surface for forming a part of the inner wall surface of the outlet cylindrical portion in the intermediate formed body and the second projecting portion has a second projecting mold surface for forming another part of the inner wall surface of the outlet cylindrical portion in the intermediate formed body.
  • the parts of the inner wall surface of the outlet cylindrical portion can be formed efficiently by the back mold and the front mold.
  • scroll pieces with enhanced design flexibility can be produced more easily with good productivity.
  • the projection end of the first projecting portion is located closer to the front end than the projection end of the second projecting portion. In such a case, the volume of the residue portion in the intermediate formed body can be reduced and therefore the man-hours in the cutting and removal step can be reduced.
  • FIGS. 1 to 16 An embodiment of the method for producing a compressor housing for a turbocharger will be described with reference to FIGS. 1 to 16 .
  • the compressor housing 1 is able to house an impeller 10 .
  • the compressor housing 1 includes an inlet port 11 , a scroll chamber 12 , an outlet port 13 , and an outlet communicating section 14 .
  • the inlet port 11 is formed adjacent to the front end of the impeller 10 and opens to the front end in an axial direction Z.
  • the scroll chamber 12 is formed on an outer circumferential side of the impeller 10 in a circumferential direction.
  • the outlet port 13 opens to the front end in an axial direction Z on an outer circumferential side of the inlet port 11 .
  • the outlet communicating section 14 communicates between the outlet port 13 and the scroll chamber 12 .
  • the compressor housing 1 is constructed by assembling a scroll piece 2 and a shroud piece 3 , which are each formed as a discrete part, together in the axial direction Z.
  • the scroll piece 2 includes an inlet cylindrical portion 21 , a front side wall section 22 , and an outlet cylindrical portion 23 .
  • the inlet cylindrical portion 21 makes the inlet port 11 and has a through hole in the axial direction Z.
  • the front side wall section 22 is located on an outer circumference side of the inlet cylindrical portion 21 and makes a front area of the wall surface of the scroll chamber 12 .
  • the outlet cylindrical portion 23 extends from a region in the circumferential direction of the front side wall section 22 and makes the outlet communicating section 14 and the outlet port 13 .
  • the shroud piece 3 includes: a shroud press-fit portion 31 in a cylindrical shape to be press-fitted into the inlet cylindrical portion 21 ; an inner circumferential wall section 32 making an inner circumferential area of the wall surface of the scroll chamber 12 ; a shroud surface 33 opposed to the impeller 10 ; and a diffuser surface 34 extending from the shroud surface 33 to the scroll chamber 12 .
  • a die casting step and a cutting and removal step are performed. As shown in FIGS. 7 to 12 , in the die casting step, die casting is carried out using a back mold 4 and a front mold 5 to form an intermediate formed body 20 .
  • the back mold 4 includes a first projecting portion 41 projecting toward the front side.
  • the front mold 5 includes a second projecting portion 51 projecting toward the back side.
  • the front mold 5 is a mold being movable back and forth relative to the back mold 4 in the axial direction Z.
  • the intermediate formed body 20 obtained by the die casting step includes residue portions 201 including a metal material left within the outlet cylindrical portion 23 .
  • both the first projecting portion 41 and the second projecting portion 51 are disposed within the outlet cylindrical portion 23 .
  • the cross sections of the molds outside the outlet cylindrical portion 23 are omitted.
  • the die casting forming molds used in the die casting step are made up of the pair of back mold 4 and the front mold 5 as described above.
  • the paired molds are movable back and forth relative to each other along the axial direction Z.
  • other molds than the back mold 4 and the front mold 5 such as a core or a slide mold, are not used.
  • the back mold 4 and the front mold 5 each include mold surfaces for forming portions of the scroll piece 2 .
  • the first projecting portion 41 of the back mold 4 has a first projecting mold surface 411 for forming a part of the inner wall surface of the outlet cylindrical portion 23 in the intermediate formed body 20 .
  • the second projecting portion 51 of the front mold 5 has a second projecting mold surface 511 for forming another part of the inner wall surface of the outlet cylindrical portion 23 in the intermediate formed body 20 .
  • the back mold 4 includes, in addition to the first projecting mold surface 411 , mold surfaces for forming: an inner wall surface of the front side wall section 22 in the scroll piece 2 ; an area of the outer wall surface of the outlet cylindrical portion 23 ; a back area of the inner wall surface of the inlet cylindrical portion 21 ; and others.
  • the front mold 5 includes, in addition to the second projecting mold surface 511 , mold surfaces for forming: an outer wall surface of the front side wall section 22 in the scroll piece 2 ; an area of the outer wall surface of the outlet cylindrical portion 23 ; a front area of the inner wall surface of the inlet cylindrical portion 21 ; and others.
  • the back mold 4 and the front mold 5 are mated to each other.
  • the first projecting portion 41 and the second projecting portion 51 are abutted against each other as shown in FIGS. 7 and 8 .
  • a projection end 414 of the first projecting portion 41 is located closer to the front side of the intermediate formed body 20 than a projection end 514 of the second projecting portion 51 . That is, the first projecting portion 41 and the second projecting portion 51 overlap each other in the axial direction Z.
  • An end surface 412 formed at the projection end 414 of the first projecting portion 41 and a stepped surface 512 of the second projecting portion 51 are brought into surface-to-surface contact with each other in the axial direction Z.
  • a side surface 413 of the first projecting portion 41 and a side surface 513 of the second projecting portion 51 are brought into surface-to-surface contact with each other in a direction approximately perpendicular to the axial direction Z.
  • the back mold 4 and the front mold 5 are separated from each other relatively in the axial direction Z to accomplish coring-out.
  • the intermediate formed body 20 which is a body formed from a metal material, is obtained.
  • the intermediate formed body 20 has a shape that is approximately the same as the shape of the scroll piece 2 to be eventually obtained (see FIGS. 13 and 14 ).
  • the residue portions 201 remain within the outlet cylindrical portion 23 in the intermediate formed body 20 . This is because, within the outlet cylindrical portion 23 of the scroll piece 2 , there are portions that cannot be formed by the coring-out in the axial direction Z.
  • the residue portions 201 are present only partly existing at two locations on the inner wall of the outlet cylindrical portion 23 , as shown in FIG. 12 .
  • the residue portions 201 are removed by cutting in the cutting and removal step.
  • the scroll piece 2 having the desired outlet cylindrical portion 23 is obtained as shown in FIGS. 13 and 14 .
  • the residue portions 201 are cut and removed using a cutting tool such as a ball end mill, for example.
  • the residue portions 201 are cut and removed with a cutting tool being inserted into the outlet cylindrical portion 23 from the back side or front side of the intermediate formed body 20 or from both the back side and front side of the intermediate formed body 20 .
  • the inner wall surface of the outlet cylindrical portion 23 is processed.
  • numerical control cutting i.e., NC cutting
  • a multi-axis machine tool may be employed to increase the productivity.
  • the scroll piece 2 can be obtained.
  • An insert hole or the like for inserting a screw for securing the scroll piece 2 to a seal plate 6 can be formed as necessary by drilling or other means.
  • the compressor housing 1 is formed by assembling the shroud piece 3 to the scroll piece 2 in the axial direction Z. Specifically, the shroud press-fit portion 31 of the shroud piece 3 is press-fitted into the inlet cylindrical portion 21 of the scroll piece 2 .
  • the inner circumferential wall section 32 of the shroud piece 3 is smoothly connected to the front side wall section 22 of the scroll piece 2 to form the scroll chamber 12 .
  • the shroud piece 3 can also be cast by die casting a metal such as aluminum.
  • the shroud piece 3 is shaped such that coring-out in the axial direction Z is possible and therefore does not require a step corresponding to the above-described cutting and removal step.
  • the seal plate 6 is assembled to the scroll piece 2 , to which the shroud piece 3 has been assembled.
  • the seal plate 6 is an approximately disc-shaped plate.
  • a flat diffuser opposite surface 61 is formed in an annular shape at the front surface of the seal plate 6 .
  • an outer circumferential rising portion 62 projecting toward the front side is formed along approximately entire outer circumference of the seal plate 6 .
  • an outer circumferential concave surface 63 having a smooth concave shape, as viewed in the cross section containing the central axis of the compressor housing 1 is formed at the inner circumferential surface of the outer circumferential rising portion 62 .
  • the outer circumferential rising portion 62 is shaped such that the height of the projection gradually changes along the circumferential direction. Further, as shown in FIGS. 5 and 6 , in a region of the outer circumferential rising portion 62 in the circumferential direction, an outlet concave surface 64 is formed such that it smoothly connects to the outlet cylindrical portion 23 of the scroll piece 2 .
  • the diffuser opposite surface 61 faces the diffuser surface 34 of the shroud piece 3 .
  • a diffuser passage 15 is formed between the diffuser surface 34 and the diffuser opposite surface 61 .
  • the seal plate 6 When the seal plate 6 is assembled to the compressor housing 1 , the compressor housing 1 is placed in a state in which the impeller 10 is disposed therewithin. In reality, as shown in FIG. 2 , the compressor housing 1 is secured to the seal plate 6 assembled to the center housing of the turbocharger (not shown), in such a manner that the impeller 10 is disposed inside of the compressor housing 1 .
  • the seal plate 6 is a discrete component separate from the center housing. However, the seal plate may be integral with the center housing as a part thereof.
  • the inner circumferential wall section 32 of the shroud piece 3 , the front side wall section 22 of the scroll piece 2 , and the outer circumferential concave surface 63 of the seal plate 6 are smoothly connected together.
  • the scroll chamber 12 is completed within them.
  • the space formed by the inner circumferential wall section 32 and the front side wall section 22 is also referred to as the scroll chamber 12 .
  • the outlet concave surface 64 of the seal plate 6 smoothly connects to the inner wall surface of the outlet cylindrical portion 23 of the scroll piece 2 .
  • the compressor housing 1 is in a state in which the seal plate 6 has been assembled thereto as shown in FIGS. 1 to 5 .
  • the compressor housing 1 in this state houses the impeller 10 as shown in FIG. 2 to form the compressor.
  • the compressor takes in air through the inlet port 11 by means of rotation of the impeller 10 .
  • the intake air is delivered to the scroll chamber 12 from the impeller 10 through the diffuser passage 15 .
  • the intake air is compressed and the compressed air is delivered to the internal-combustion engine through the outlet port 13 .
  • the above-described method for producing a compressor housing includes the die casting step and the cutting and removal step.
  • die casting is performed using the back mold 4 and the front mold 5 , which are movable back and forth relative to each other in the axial direction Z. Further, the die casting is performed in such a manner that the first projecting portion 41 of the back mold 4 and the second projecting portion 51 of the front mold 5 are positioned within the outlet cylindrical portion 23 . This makes it possible to easily form, by die casting, the intermediate formed body 20 having a shape close to the final shape of the scroll piece 2 without using a core or the like.
  • the residue portions 201 in the intermediate formed body 20 are removed by cutting in the cutting and removal step, and thereby the scroll piece 2 can be readily produced.
  • the simple die casting step and the simple cutting and removal step in this manner, it is possible to readily produce the scroll piece 2 . Consequently, production of the compressor housing 1 can be readily accomplished and therefore the production man-hours and the production cost can be minimized.
  • the first projecting portion 41 and the second projecting portion 51 are abutted against each other.
  • the intermediate formed body 20 has the residue portions 201 only partly existing on the inner wall surface of the outlet cylindrical portion 23 . Therefore, the area to be cut in the inner wall surface of the outlet cylindrical portion 23 in the cutting and removal step can be reduced. Consequently, it is possible to further improve the productivity for producing the compressor housing 1 .
  • the first projecting portion 41 of the back mold 4 has the first projecting mold surface 411 and the second projecting portion 51 of the front mold 5 has the second projecting mold surface 511 .
  • the scroll piece 2 with enhanced design flexibility can be produced more easily with good productivity.
  • the projection end 414 of the first projecting portion 41 is located closer to the front side of the intermediate formed body 20 than the projection end 514 of the second projecting portion 51 . This also makes it possible to reduce the volume of the residue portions 201 in the intermediate formed body 20 and therefore to reduce the man-hours in the cutting and removal step.
  • the present embodiment is an embodiment in which the first projecting portion 41 and the second projecting portion 51 are not abutted against each other in the die casting step.
  • the configuration is such that, when the back mold 4 and the front mold 5 are mated together, the first projecting portion 41 and the second projecting portion 51 are not abutted against each other with a clearance C formed therebetween. In this configuration, the molten metal enters the clearance C as well.
  • the outlet cylindrical portion 23 of the intermediate formed body 20 is shaped such that the inside spaces do not pass therethrough.
  • the solidified portion of the molten metal that has entered the clearance C between the first projecting portion 41 and the second projecting portion 51 becomes a residue portion 202 within the outlet cylindrical portion 23 of the intermediate formed body 20 .
  • the residue portion 202 partitions the space within the outlet cylindrical portion 23 into the outlet port 13 -side region and the scroll chamber 12 -side region.
  • the residue portion 202 is in the form of a film. Together with the film-form residue portion 202 , residue portions 201 similar to the residue portions formed in the intermediate formed body 20 of Embodiment 1 also remain.
  • the residue portions 201 and the residue portion 202 are continuously formed.
  • the thickness of the film-form residue portion 202 is preferably as small as possible.
  • the shape of the residue portion 202 is not particularly limited.
  • the film-form residue portion 202 is removed together with the other residue portions 201 .
  • the inside space of the outlet cylindrical portion 23 is passed therethrough and the inner wall surface of the outlet cylindrical portion 23 is formed into the desired shape.
  • the scroll piece 2 (see FIG. 14 ) is produced.
  • the other configurations are similar to those of Embodiment 1.
  • the characters that are the same as those used in Embodiment 1 represent elements or the like similar to those in the previous embodiment unless otherwise specified.
  • the first projecting portion 41 and the second projecting portion 51 are not abutted against each other and therefore the dimensional accuracies of the facing surfaces of the first projecting portion 41 and the second projecting portion 51 need not be particularly high. As a result, it is possible to reduce the production cost.
  • This embodiment has functions and advantages similar to those of Embodiment 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Supercharger (AREA)
US15/296,333 2015-11-27 2016-10-18 Method for producing compressor housing Abandoned US20170151608A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015232228A JP6535584B2 (ja) 2015-11-27 2015-11-27 コンプレッサハウジングの製造方法
JP2015-232228 2015-11-27

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US20170151608A1 true US20170151608A1 (en) 2017-06-01

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US15/296,333 Abandoned US20170151608A1 (en) 2015-11-27 2016-10-18 Method for producing compressor housing

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US (1) US20170151608A1 (ja)
EP (1) EP3173627B1 (ja)
JP (1) JP6535584B2 (ja)
CN (1) CN106807912A (ja)

Cited By (5)

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US20170175764A1 (en) * 2015-12-16 2017-06-22 Denso Corporation Centrifugal blower
US11035377B2 (en) 2018-05-23 2021-06-15 Otics Corporation Compressor housing for turbocharger and method for manufacturing the same
US11067094B2 (en) * 2016-03-30 2021-07-20 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Compressor scroll and centrifugal compressor
WO2021253076A1 (en) * 2020-06-15 2021-12-23 Hc-Atm Group Pty Ltd A housing assembly
US11629605B2 (en) * 2018-03-28 2023-04-18 Cummins Ltd Turbine wheel and method of manufacturing the same

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US10473113B2 (en) * 2015-12-16 2019-11-12 Denso Corporation Centrifugal blower
US11067094B2 (en) * 2016-03-30 2021-07-20 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Compressor scroll and centrifugal compressor
US11629605B2 (en) * 2018-03-28 2023-04-18 Cummins Ltd Turbine wheel and method of manufacturing the same
US11035377B2 (en) 2018-05-23 2021-06-15 Otics Corporation Compressor housing for turbocharger and method for manufacturing the same
WO2021253076A1 (en) * 2020-06-15 2021-12-23 Hc-Atm Group Pty Ltd A housing assembly

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EP3173627B1 (en) 2018-03-21

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