JP4822951B2 - Die for forging and manufacturing method of product having stepped portion using the same - Google Patents

Description

  The present invention relates to a forging die for forging a product having a stepped portion in a direction intersecting the flow direction of a plastically forged material, and a method for producing a product having the stepped portion using the same. For example, the present invention can be applied to a forging die for forging a scroll member used in a scroll fluid machine, a method for manufacturing a scroll member using the same, and the like.

  Conventionally, forging is known as a method for producing an aluminum alloy product that requires stable quality and high strength. For example, a scroll member applied to a scroll fluid machine is required to have high strength so that the spiral wrap is not damaged by the stress because a large repeated stress due to high pressure acts on the root portion of the spiral wrap. Thus, for the aluminum alloy scroll member aiming at weight reduction and high strength, forging is being promoted as one of countermeasures (for example, see Patent Document 1).

  Further, in the scroll member as described above, a step portion is provided on each of the tip surface and the bottom surface of the spiral wrap so that the wrap height is higher than the wrap height on the inner periphery side on the outer periphery side of the spiral wrap. Has proposed a scroll fluid machine that achieves high performance by configuring a scroll compression mechanism capable of three-dimensional compression that can be compressed in the circumferential direction and the lap height direction (see, for example, Patent Document 2).

JP-A-11-285774 Japanese Patent Publication No. 60-17756

By the way, when forging the scroll member having the step portion provided on the lap bottom surface of the spiral wrap as described above, a step portion forming die for forming the step portion is provided in a part of the forming die. It will be. The step forming mold has an extending portion extending by an amount corresponding to the height of the step portion in a direction intersecting with a direction in which the forging material plastically flows (hereinafter, simply referred to as material flow). It is usual to have a configuration provided.
However, if there is an extension portion with respect to the adjacent mold surface in the molding die, the extension portion may inhibit the plastic flow of the forging material in the molding die. In other words, if there is an extension in the direction that intersects the flow direction of the forging material, the forging material will flow over the extension, so the higher the extension portion, the more the material flows. Resistance increases. For this reason, a large stress due to the material flow is applied to the extending portion, which causes a problem that the life of the stepped mold is reduced, cracked, or damaged.

  Therefore, in order to avoid the troubles described above, after forging with the stepped portion being lower than the originally required height, by cutting separately, the stepped portion height originally required as the product is obtained. Processing is done. However, in this case, the stock removal allowance for cutting after forging is increased, the number of processing steps increases, and the amount of material used as the forging material increases. This is a factor that increases the manufacturing cost of the product.

  The present invention has been made in view of such circumstances, and even when forging a product having a stepped portion in a direction crossing the flow direction of the plastic material forged, the predetermined height is increased. A forging die and a method for producing a product having a step portion using the same can be formed at the same time and can prevent a reduction in the life, cracking, breakage, etc. of the molding die. The purpose is to do.

In order to solve the above-mentioned problems, the following means is adopted in the method for producing a forging die of the present invention and a product having a step portion using the same.
That is, the forging die according to the present invention includes a material setting space in which a forging material is set and a molding punch for applying a compressive force to the forging material is inserted, and a step portion forming die for forming the step portion. A forging die that forge-molds a product having a step portion by plastically flowing a forging material set in the material set space, wherein the forging material is plastically flowed. An extending portion extending in a direction intersecting with the direction in which the forging is performed, and the extending portion is connected to the upstream portion of the corner formed on the upstream surface side that receives the flow of the forging material , and to the upstream portion of the corner A top surface formed in the material flow direction and a corner downstream portion forming an opposite surface on the downstream side of the corner upstream portion, and the top surface is formed along the material flow direction. On the first inclined surface that gradually increases the road Ri is formed, the corner downstream portion is characterized by being formed by a second inclined surface which gradually decreases forming material flow channel toward the downstream side of the opposite surface.

According to the present invention, in the extending portion of the step forming mold, the top surface connected to the upstream portion of the corner and formed substantially in the material flow direction gradually increases the material flow channel along the material flow direction. The corner downstream portion that is formed by the inclined surface and forms the opposite surface on the downstream side of the corner upstream portion is formed by the second inclined surface that gradually reduces the material flow channel toward the downstream side of the opposite surface. Therefore, the first component force and the second component force in the anti-material flow direction based on the compression force of the forming punch acting through the forging material toward the top surface of the extension portion by the first inclined surface and the second inclined surface, respectively. Component force is generated, and these component force acts as a reaction force against the stress applied to the extension portion by the material flow. For this reason, the stress by the material flow which acts on the extension part can be reduced. Therefore, it is possible to prevent the occurrence of a reduction in the life of the molding die, cracks, breakage, etc. caused by the stress due to the material flow during molding. The parts can be simultaneously formed by forging.

Furthermore, the forging die according to the present invention includes a material setting space in which a forging material is set and a molding punch for applying a compressive force to the forging material is inserted, and a step portion forming die for forming the step portion. A forging die that forge-molds a product having a step portion by plastically flowing a forging material set in the material set space, wherein the forging material is plastically flowed. An extending portion extending in a direction intersecting with the direction in which the forging is performed, and the extending portion is connected to the upstream portion of the corner formed on the upstream surface side that receives the flow of the forging material , and to the upstream portion of the corner A top surface formed in the material flow direction and a corner downstream portion forming an opposite surface on the downstream side of the corner upstream portion, and the top surface is formed along the material flow direction. By the first inclined surface that gradually increases the road Is formed, characterized in that it comprises a first component force generating region for generating a reaction material first force component to the flow direction of the material flow direction and opposite.

According to the present invention, in the extending portion of the step forming mold, the top surface connected to the upstream portion of the corner and formed substantially in the material flow direction gradually increases the material flow channel along the material flow direction. Since the first component force generating region that is formed by the inclined surface and generates the first component force in the anti-material flow direction is formed, the first component force generating region formed by the first inclined surface is extended. A first component force in the anti-material flow direction is generated based on the compression force of the forming punch acting through the forging material toward the top surface of the protruding portion, and this is a reaction force against the stress applied to the extending portion by the material flow Will act. For this reason, the stress by the material flow which acts on the extension part can be reduced. Therefore, it is possible to prevent the occurrence of a reduction in the life of the molding die, cracks, breakage, etc. caused by the stress due to the material flow during molding. The parts can be simultaneously formed by forging.

Furthermore, the forging die according to the present invention includes a material setting space in which a forging material is set and a molding punch for applying a compressive force to the forging material is inserted, and a step portion forming die for forming the step portion. A forging die that forge-molds a product having a step portion by plastically flowing a forging material set in the material set space, wherein the forging material is plastically flowed. An extending portion extending in a direction intersecting with the direction in which the forging is performed, and the extending portion is connected to the upstream portion of the corner formed on the upstream surface side that receives the flow of the forging material , and to the upstream portion of the corner A top surface formed in the material flow direction and a corner downstream portion forming an opposite surface on the downstream side of the corner upstream portion, and the corner downstream portion is directed toward the downstream side of the opposite surface. Second slope that gradually reduces the flow path Is formed by a surface, characterized in that it comprises a second component force generating region for generating a reaction material second component force to the flow direction of the material flow direction and opposite.

According to the present invention, in the extended portion of the stepped mold, the second inclined portion in which the corner downstream portion forming the opposite surface on the downstream side of the corner upstream portion gradually reduces the material flow channel toward the downstream side of the opposite surface. Since the second component force generation region that is formed by the surface and generates the second component force in the anti-material flow direction is formed, the second component force generation region formed by the second inclined surface extends. A second component force is generated in the anti-material flow direction based on the compression force of the forming punch acting through the forging material toward the top surface of the part, and this acts as a reaction force against the stress applied to the extension by the material flow Will be. For this reason, the stress by the material flow which acts on the extension part can be reduced. Therefore, it is possible to prevent the occurrence of a reduction in the life of the molding die, cracks, breakage, etc. caused by stress due to material flow during molding, and in a product having a stepped portion, a height step that is originally required. The parts can be simultaneously formed by forging.

Furthermore, the forging die according to the present invention is any one of the forging die described above, wherein the corner upstream portion is formed by a smooth curved surface, and the material for receiving the flow of the forging material to the top surface side. A flow receiving area is provided.

According to the present invention, the upstream portion of the corner on the upstream surface side that receives the material flow is formed by a smooth curved surface in the extending portion of the step mold, and the material flow receiving region for receiving the material flow to the top surface side is formed. As it is formed, when the forging material flows over the extension part to the downstream side, it flows smoothly along a smooth curved surface, so that the flow resistance in the extension part can be reduced. it can. For this reason, the stress by the material flow which acts on the extension part can be reduced. Therefore, when it is possible to prevent the occurrence of mold life reduction, cracking, breakage, etc. caused by stress due to material flow at the time of molding, the height that is originally required in products having stepped portions These step portions can be simultaneously formed by forging.

  Furthermore, the forging die according to the present invention is the forging die according to any one of the above-described forging dies, wherein the extending portion has a step height of the product with respect to a forming die surface adjacent to the step forming die. It has the extending direction height corresponding to.

  According to the present invention, the height in the extending direction with respect to the mold surface adjacent to the extending portion is equivalent to the height of the stepped portion of the product, so the material allowance when cutting the stepped portion after forging is minimized. Limit. Thereby, while being able to reduce the material usage-amount of a forge raw material, the processing man-hours after forge molding can be reduced. Therefore, the manufacturing cost of the final product can be reduced.

  Moreover, the manufacturing method of the product which has the step part concerning this invention is a method of manufacturing the product which has a step part by forging using one of the above-mentioned forging molds, Comprising: It supplies to the said raw material set space A compression force is applied to the forged material formed by the forming punch, and a step portion in a direction intersecting a direction in which the forged material plastically flows is formed by the extending portion of the step portion forming die. It is characterized by that.

  According to the present invention, the stress due to the flow of the forging material acting on the extending portion of the stepped mold during forging is reduced as described above, thereby preventing a reduction in the life, cracking, and breakage of the molding die. The stepped portion in the direction intersecting the flow direction of the forging material can be simultaneously formed by forging by the extending portion. Therefore, the post-processing man-hours of the stepped portion after forging can be reduced, and the productivity of the product having the stepped portion can be improved.

  Furthermore, the method for producing a product having a stepped portion according to the present invention is the above-described method for producing a product having a stepped portion, wherein the product having the stepped portion is a scroll member applied to a scroll fluid machine, and the stepped portion is provided. Is a step in the wrap height direction formed on the lap bottom surface of the spiral wrap.

  According to the present invention, the scroll member having the configuration in which the spiral wrap is erected on one surface of the end plate and the step portion in the wrap height direction is formed on the wrap bottom surface is formed on the wrap bottom surface. It becomes possible to perform simultaneous molding by forging as described above, including the stepped portion of the predetermined height. Therefore, the production efficiency of the scroll member having a step portion on the lap bottom surface can be increased.

According to the forging die of the present invention, it is possible to reduce the stress due to plastic flow of the forging material loaded on the extending portion of the step forming die for forming the step, so that the stress due to the material flow during forming is reduced. In addition to being able to prevent the occurrence of mold life reduction, cracking, breakage, etc., caused by the above, it is possible to simultaneously form the stepped portion with the required height in a product having a stepped portion by forging. It becomes possible.
In addition, according to the method for manufacturing a product having a step portion of the present invention, it becomes possible to simultaneously form the step portion of the product by forging while preventing a reduction in the life of the molding die, cracking, and damage. It is possible to reduce the post-processing man-hour for the stepped portion after forging and improve the productivity of the product having the stepped portion.
In particular, the productivity of the scroll member can be improved by applying it to the manufacture of a scroll member having a stepped portion on the lap bottom surface.

Embodiments according to the present invention will be described below with reference to the drawings.
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
First, with reference to FIG. 1 thru | or FIG. 4, the scroll member which is an example of the product which has a step part, and a scroll fluid machine using the same are demonstrated. FIG. 1 shows a longitudinal sectional view of a scroll fluid machine 1.
The scroll fluid machine 1 includes a front housing 5 and a rear housing 7, and includes a housing 3 in which these are integrally fastened and fixed by bolts 9.

  A crankshaft 11 is supported inside the front housing 5 so as to be rotatable about an axis L via a main bearing 13 and a sub-bearing 15. One end side (left side in the drawing) of the crankshaft 11 is a small diameter shaft portion 11A, and this small diameter shaft portion 11A penetrates the front housing 5 and protrudes to the left side in the drawing. An electromagnetic clutch 17 is mounted on the protruding portion of the small-diameter shaft portion 11 </ b> A, and power is transmitted between the outer periphery of the small-diameter boss portion 5 </ b> A on one end side of the front housing 5 and a pulley 21 that is rotatably provided via a bearing 19. Is now intermittent. Power is transmitted to the pulley 21 from a drive source such as an engine (not shown) via a V-belt or the like. A mechanical seal (lip seal) 23 is installed between the main bearing 13 and the sub-bearing 15, thereby hermetically sealing the inside of the housing 3 and the atmosphere.

  A large-diameter shaft portion 11B is provided on the other end side (right side in the drawing) of the crankshaft 11. Further, the large-diameter shaft portion 11B has an eccentric pin that is eccentric from the axis L of the crankshaft 11 by a predetermined dimension. 11C is provided integrally. A large diameter shaft portion 11B and a small diameter shaft portion 11A of the crankshaft 11 are rotatably supported by the front housing 5 via a main bearing 13 and a sub bearing 15, respectively. A rotating scroll member 33, which will be described later, is connected to the eccentric pin 11C through a drive bush 25 and a drive bearing 27, and the rotating scroll member 33 is driven to rotate by rotating the crankshaft 11. ing.

The drive bush 25 is provided with a balance weight 25 </ b> A for removing an unbalanced load generated when the orbiting scroll member 33 is orbitally driven. The balance weight 25 </ b> A is orbited together with the orbiting scroll member 33.
A pair of fixed scroll member 31 and orbiting scroll member 33 constituting the scroll compression mechanism 29 are incorporated in the housing 3. The fixed scroll member 31 is composed of an end plate 31A and a spiral wrap 31B erected from the end plate 31A, while the orbiting scroll member 33 is a spiral erected from the end plate 33A and the end plate 33A. And a wrap 33B.

  As shown in FIG. 2, the fixed scroll member 31 and the orbiting scroll member 33 are stepped portions 31E at predetermined positions along the spiral direction of the tip surfaces 31C and 33C and the bottom surfaces 31D and 33D of the spiral wraps 31B and 33B, respectively. , 31F and 33E, 33F. With the stepped portions 31E, 31F and 33E, 33F as boundaries, the outer peripheral end surfaces 31G, 33G are higher and the inner peripheral end surfaces 31H, 33H are lower in the wrap front end surfaces 31C, 33C. Further, in the bottom surfaces 31D and 33D, the bottom surfaces 31I and 33I on the outer peripheral side are low, and the bottom surfaces 31J and 33J on the inner peripheral side are high. Thereby, the spiral wraps 31B and 33B have the wrap height on the outer peripheral side higher than the wrap height on the inner peripheral side.

  As shown in FIG. 1, the fixed scroll member 31 and the orbiting scroll member 33 are separated from each other by the orbiting radius, and the spiral wraps 31B and 33B are engaged with each other with a phase difference of 180 degrees. Incorporated in. As a result, a pair of compression chambers 35 limited by the end plates 31A and 33A and the spiral wraps 31B and 33B are formed symmetrically with respect to the scroll center between the scroll members 31 and 33. The compression chamber 35 has a height in the axis L direction higher than the height on the outer peripheral side of the spiral wraps 31B and 33B and is capable of three-dimensional compression that can be compressed in the circumferential direction and the wrap height direction. The mechanism is configured.

The fixed scroll member 31 is fixedly installed on the inner surface of the rear housing 7 via a bolt 37. In the orbiting scroll member 33, the eccentric pin 11C provided on one end side of the crankshaft 11 as described above is fitted into the boss portion provided on the back surface of the end plate 33A via the drive bush 25 and the bearing 27. Thus, the crankshaft 11 is connected.
The orbiting scroll member 33 has a back surface of the end plate 33A supported on a thrust receiving surface 5B formed on the front housing 5, and is interposed between the thrust receiving surface 5B and the back surface of the orbiting scroll member 33. By the rotation-preventing pin ring mechanism 39, the orbiting scroll member 33 is configured to be revolved and driven with respect to the fixed scroll member 31 while being prevented from rotating.

In order to install the rotation-preventing pin ring mechanism 39, a pin hole for raising the pin 39A is provided on one of the back surface of the end plate 33A and the thrust receiving surface 5B of the orbiting scroll member 33, and a ring hole for fitting the ring 39B is provided on the other side. . In the present embodiment, the thrust receiving surface 5B is provided with a pin hole 5C for standing the pin 39A, and the orbiting scroll member 33 is provided with a ring hole 33K for fitting the ring 39B.
As shown in FIG. 3, the pin holes 5C and the ring holes 33K are provided in a plurality of locations in the circumferential direction, generally 3 to 4 locations (4 locations in the present embodiment).

As described above, the orbiting scroll member 33 is provided with the spiral wrap 33B on one end face of the end plate 33A, and the ring hole 33K into which the ring 39B of the rotation preventing pin ring mechanism 39 is fitted on the other end face. Will be provided. Further, the spiral wrap 33B is formed with a lap height changing portion 33M (33L, 33E, 33F) in which the height in the axis L direction changes, such as the wrap end portion 33L and the step portions 33E, 33F. Become.
FIG. 3 shows the positional relationship on the plane between the ring hole 33K and the lap height changing portion 33M (33L, 33E, 33F). As is apparent from the figure, the ring hole 33K is arranged avoiding the position where the wrap height changing portion 33M is projected on the other end surface of the end plate 33A when viewed in the axis L direction. Specifically, the ring hole 33K is arranged at a position shifted by at least 30 degrees in the circumferential direction and 45 degrees in the present embodiment with respect to the position of the wrap height changing portion 33M.

Instead of the pin ring mechanism 39, an Oldham ring mechanism may be adopted as known. In this case, as shown in FIG. 4, the thrust receiving surface 5B of the front housing 5 and the back surface of the orbiting scroll member 33 are used. The other end face is provided with a key groove 33Q orthogonal to each other, and an Oldham ring side key (not shown) is fitted into this key groove 33Q.
On the orbiting scroll member 33 side, a pair of key grooves 33Q are provided at symmetrical positions across the scroll center, as shown in FIG. And this keyway 33Q is arrange | positioned avoiding the position projected on the end surface seeing to the axial direction with respect to the position of 33 W of wrap height changes of the spiral wrap 33B. Specifically, the key groove 33Q is disposed at a position shifted by at least 30 degrees in the circumferential direction, or 90 degrees in the circumferential direction in the present embodiment, with respect to the position of the wrap height changing portion 33M.

  Further, as shown in FIG. 1, the end plate 31A of the fixed scroll member 31 has a discharge port 31C that discharges compressed refrigerant gas at the center thereof, and the discharge port 31C includes an end port 31C. A discharge reed valve 43 attached to the plate 31A via a retainer 41 is provided. Further, a seal member 45 such as an O-ring is installed on the back surface of the end plate 31A so as to be in close contact with the inner surface of the rear housing 7, and the seal member 45 allows the housing 3 to be interposed between the end plate 31A and the rear housing 7. A discharge chamber 47 partitioned from the internal space is formed. In this way, the internal space of the housing 3 excluding the discharge chamber 47 is configured to function as the suction chamber 49.

  Refrigerant gas returning from the refrigeration cycle is sucked into the suction chamber 49 via a suction port (not shown) provided in the front housing 5, and the fixed scroll member 31 and the orbiting scroll member are passed through the suction chamber 49. The refrigerant gas is sucked into the compression chamber 35 formed between 33. A sealing member 51 such as an O-ring is installed on the joint surface between the front housing 5 and the rear housing 7, and the suction chamber 47 in the housing 3 is hermetically sealed from the atmosphere.

The scroll fluid machine operates as follows.
When the rotational driving force transmitted from the external drive source to the pulley 21 is transmitted to the crankshaft 11 via the electromagnetic clutch 17 and the crankshaft 11 is rotated, the drive bush 25 and the bearing 27 are attached to the eccentric pin 11C of the crankshaft 11. The orbiting scroll member 33 connected to the fixed scroll member 31 is revolved and rotated with respect to the fixed scroll member 31 while being prevented from rotating by the pin ring mechanism 39 or an Oldham ring mechanism (not shown).

  By the revolving turning drive of the orbiting scroll member 33, the refrigerant gas in the suction chamber 49 is sucked into the compression chamber 35 formed at the outermost side in the radial direction. The compression chamber 35 is moved to the center side while the volume is reduced in the circumferential direction and the lap height direction after being closed by suction at a predetermined turning angle position. During this time, the refrigerant gas is compressed, and when the compression chamber 35 reaches a position where it communicates with the discharge port 31C, the discharge reed valve 43 is pushed open and the compressed gas is discharged into the discharge chamber 47. This compressed refrigerant gas Is discharged out of the apparatus through the discharge chamber 47.

Next, a forging die 61 forging the scroll member and a method for manufacturing the scroll member using the same will be described with reference to FIGS. FIG. 5 shows a schematic configuration of a forging die 61 for forming the orbiting scroll member 33.
The forging die 61 enters the material setting space 63 into which the forging material (for example, A403) 33S of the orbiting scroll member 33 is set, and enters the material setting space 63 to apply a compressive force to the forging material 33S. And a molding die 67 for molding the spiral wrap 33B.

  The molding die 67 has a stepped portion forming die 69 for forming a stepped portion 33F (see FIG. 2B) on the lap bottom surface 33D of the orbiting scroll member 33. A convex extending portion 69A extending in a direction intersecting with the direction X in which the forging material 33S plastically flows is provided. The extending portion 69 </ b> A has an extending direction height T corresponding to the height of the stepped portion 33 </ b> F with respect to the mold surface adjacent to the stepped portion forming die 69.

Further, as shown in FIG. 6, the extending portion 69A is connected to the corner upstream portion 69C formed on the upstream surface 69B side that receives the material flow, and to the corner upstream portion 69C, and is formed in a substantially material flow direction X. The formed top surface 69D and a corner downstream portion 69E forming an opposite surface 69F on the downstream side of the corner upstream portion 69C.
The corner upstream portion 69C is formed by a smooth curved surface 169C in order to form a material flow receiving region (169C) for receiving the material flow to the top surface 69D side.
Further, the top surface 69D constitutes a first component force generation region (169D) that generates the first component force V1 in the opposite material flow direction opposite to the material flow direction X. A first inclined surface 169D for gradually increasing the material flow channel is provided.
Further, the corner downstream portion 69E forms a second component force generation region (169E) that generates the second component force V2 in the opposite material flow direction opposite to the material flow direction X, and therefore, on the downstream side of the opposite surface. The second inclined surface 169E that gradually reduces the material flow path is provided.

  The curved surface 169C, the first inclined surface 169D, and the second inclined surface 169E are desirably set to dimensions that do not allow for a large stock removal after forging, as described later. The curvature is usually the middle (half) of the extending direction height T from 1 mm provided at the wrap inflow portion, and the inclined heights of the first inclined surface 169D and the second inclined surface 169E are less than the extending direction height T. Is done.

Next, a forging method of the orbiting scroll member 33 will be described with reference to the molding process diagram of FIG.
First, in order to form the orbiting scroll member 33, the forging material 33S is charged and set in the material setting space 63 (see FIG. 5A). With respect to this forging material 33S, the molding punch 65 enters the material setting space 63, and a compressive force is applied (see FIG. 5B). As a result, the forging material 33S is plastically flowed and flows into the molding die 67 for forming the spiral wrap 33B, whereby the target product, that is, the orbiting scroll member 33 is forged (FIG. 5 ( C)).
Note that the compression processing speed of the forming punch 65 during forging (due to a mechanical press having a crank mechanism) is generally set to an average processing speed of about 10 to 150 mm / sec in a range of 0 to 15 mm above the bottom dead center.

  Here, as shown in FIGS. 3 and 4, the plastic flow of the forging material 33S is caused by the wrap end portion 33L with respect to the center line YY connecting the scroll center and the wrap end portion 33L of the spiral wrap 33B. Since the wrap volume on the side is large, the flow X (see FIG. 5) toward the wrap end portion 33L side becomes dominant. Due to the material flow in the X direction, the extending portion 69A of the step forming die 69 extending in the direction intersecting the material flowing direction X, that is, the step portion 33F of the lap bottom surface 33D (FIG. 2B). The stress Z in the material flow direction X is applied to the extending portion 69 </ b> A for molding the reference).

Thus, according to the present embodiment, as shown in FIG. 6, the material flow receiving region (169C) for receiving the material flow to the top surface 69D side is provided in the corner upstream portion 69C forming the extending portion 69A. Since the smooth curved surface 169C is formed, the flow resistance when the forging material 33S flows over the extending portion 69A to the downstream side is reduced. That is, since the material flow receiving region (169C) is configured by the smooth curved surface 169C, the forging material 33S smoothly flows along the curved surface 169C, and the resistance to the material flow by the extending portion 69A is reduced. Can be made. For this reason, the stress Z by the material flow which acts on the extension part 69A can be reduced.
Accordingly, it is possible to prevent the life reduction, cracking, breakage, and the like of the stepped molding die 69 caused by the stress Z due to the material flow at the time of molding, and as shown in FIG. With respect to the orbiting scroll member 33 having the step portion 33F on the bottom surface 33D, the step portion 33F can be simultaneously formed by forging.

  Further, the first component force V1 (see FIG. 6) is generated on the top surface 69D connected to the corner upstream portion 69C to form the extending portion 69A in the opposite material flow direction opposite to the material flow direction X. Since the first inclined surface 169D that gradually forms the material flow channel along the material flow direction X, which constitutes the one component force generation region (169D), the extending portion 69A is provided in this region (169D). The first component force V1 in the anti-material flow direction based on the compression force of the forming punch 65 acting through the forging material 33S toward the top surface 69D of the material is generated, and this is the stress applied to the extending portion 69A by the material flow For Z, it acts as a reaction force. For this reason, the stress Z by the material flow which acts on the extension part 69A can be reduced. Accordingly, it is possible to prevent the life of the step portion molding die 69 from being reduced, cracking, and breakage due to the stress Z due to the material flow during molding, and forging the step portion 33F. Simultaneous molding is possible.

  Further, a second component generating region (second component force generating region) that generates a second component force V2 in a counter material flow direction opposite to the material flow direction in the corner downstream portion 69E connected to the top surface 69D and forming the extension 69A. 169E) and the second inclined surface 169E in which the material flow channel is formed to gradually decrease toward the downstream side of the opposite surface 69F, the region (169E) causes the top surface 69D of the extending portion 69A to be formed. A second component force V2 in the direction opposite to the material flow direction is generated based on the compression force of the forming punch 65 acting through the direct forging material 33S, and this is a reaction force against the stress Z applied to the extending portion 69A by the material flow. Will act. For this reason, the stress Z by the material flow which acts on the extension part 69A can be reduced. Accordingly, it is possible to prevent the life of the step portion molding die 69 from being reduced, cracking, and breakage due to the stress Z due to the material flow during molding, and forging the step portion 33F. Simultaneous molding is possible.

Further, since the extending portion 69A has an extending direction height T corresponding to the height of the step portion 33F with respect to the forming die surface adjacent to the step forming die 69, after forging, The stock removal allowance when cutting and finishing the spiral wrap 33B can be minimized. That is, in order to make the orbiting scroll member 33 that has been forged as a final product, the wrap side surface and bottom surface of the forged product indicated by the thick solid line 71 in FIG. It is necessary to cut it. At this time, it is desired to perform forging so that the material removal allowance can be cut by a single tool movement. For this purpose, it is indispensable that the extending direction height T of the extending portion 69A is equivalent to the height of the stepped portion 33F as described above. Uniformity can be achieved, and cutting can be performed as indicated by a broken line 73 with a single tool movement.
In addition, the thin continuous line 75 in FIG. 7 has shown the flow mark of the forge raw material 33S flowed to the spiral wrap 33B part at the time of forge molding.

Incidentally, when there is a concern about the life reduction, cracking, or breakage of the stepped mold 69 caused by the stress due to the flow of the forging material 33S, the height of the stepped portion 33F is originally required as shown in FIG. As shown by a solid line 71A in FIG. 7, after forging with a stepped portion having a lower height, as shown by a broken line 73A in FIG. It is necessary to cut to 33F. For this reason, cutting by a single tool movement becomes difficult, the number of processing steps increases, and an increase in material usage of the forging material 33S is unavoidable.
However, according to this embodiment, as described above, since the material removal allowance when cutting the stepped portion after forging can be minimized, the amount of material used for the forging material can be reduced. The processing man-hours after forging can be reduced.

  In addition, when a concave portion that becomes a ring hole 33K for the rotation prevention mechanism or a key groove 33Q is simultaneously formed on the rear surface of the end plate 33A of the orbiting scroll member 33 by forging, depending on the position of the concave portion 33N, as shown in FIG. However, as shown in FIGS. 3 and 4, the flow path for the forging material 33S to flow becomes narrow and the stress acting on the extending portion 69A of the step portion mold 69 may increase. The position where the wrap height changing portion 33M (33L, 33E, 33F) is projected from the other end surface of the end plate 33A when the wrap height changing portion 33M (33L, 33E, 33F) is viewed in the axial direction, that is, the arrangement of the wrap height changing portion 33M. By disposing at a position shifted in the circumferential direction from the position, a flow path through which the forging material 33S flows can be secured as shown in FIG. Also by this, the stress due to the material flow applied to the step forming die 69 can be reduced.

According to the embodiment described above, the following effects are obtained.
According to the forging die 61 of the present embodiment, stress due to plastic flow of the forging material 33S loaded on the extending portion 69A of the step portion forming die 69 for forming the step portion can be reduced. It is possible to prevent the life of the step portion mold 69 from being reduced, cracking, breakage, etc. caused by the stress due to the material flow of the material, and for the orbiting scroll member 33 having the step portion 33F, the step portion 33F is forged. Simultaneous molding is possible.

Further, since the extending direction height T of the extending portion 69A with respect to the adjacent mold surface is equivalent to the height of the stepped portion 33F of the orbiting scroll member 33, the material for cutting and finishing the stepped portion after forging is finished. The machining allowance can be minimized. Accordingly, the amount of material used for the forging material 33S can be reduced, the number of processing steps after forging can be reduced, and the manufacturing cost of the orbiting scroll member 33 that is the final product can be reduced.
Further, the step 33F of the orbiting scroll member 33 can be simultaneously formed by forging while preventing the life reduction, cracking and breakage of the step forming die 69, thereby reducing the number of cutting processes after forging. And the production efficiency of the turning scroll member 33 which has the step part 33F can be improved.

In the above embodiment, the manufacture of the orbiting scroll member 33 has been described as an example, but the present invention can be applied to the manufacture of the fixed scroll member 31 as well. In addition to the scroll member, the present invention can be widely applied to forging molding of products having stepped portions in the direction intersecting the material flow direction on the molding surface.
Further, in the above embodiment, the extending portion 69A of the step forming die 69 has a smooth curved surface 169C constituting the material flow receiving region, a first inclined surface 169D constituting the first component generating region, and a second portion. Although the embodiment including all three of the second inclined surfaces 169E constituting the force generation region has been described, the present invention is not limited to this, and the curved surface 169C, the first inclined surface 169D, and What is necessary is just to provide at least any one of the 2nd inclined surface 169E. However, by applying two or more of these in combination, the stress reduction effect described above can be increased. Therefore, in practical use, it is desirable to use a combination of the two or more.

It is a longitudinal cross-sectional view of the scroll fluid machine using the scroll member manufactured with the die for forging which concerns on one Embodiment of this invention. It is an external appearance perspective view of the fixed scroll member (A) and turning scroll member (B) for scroll fluid machines shown by FIG. FIG. 3 is a plan view of the orbiting scroll member shown in FIG. 2. It is a top view of the turning scroll member of a different structure from the turning scroll member shown by FIG. FIG. 3 is a process diagram of a method for forging the orbiting scroll member shown in FIG. 2. It is the elements on larger scale of the step part shaping | molding die in the metal mold | die for forging which concerns on one Embodiment of this invention. It is a comparison figure of the processing state (A) after forging by the die for forging concerning one embodiment of the present invention, and the processing state (B) after the conventional forging.

DESCRIPTION OF SYMBOLS 1 Scroll fluid machine 33 Orbiting scroll member 33F Step part 33S Forging material 61 Forging metal 63 Material set space 65 Molding punch 67 Molding die 69 Step part forming die 69A Extension part 69B Upstream surface 69C Corner upstream part 69D Top surface 69E Downstream corner 69F Opposite surface 169C Smooth curved surface (material flow receiving area)
169D first inclined surface (first component force generation region)
169E second inclined surface (second component generation region)
T Extension direction height V1 First component force V2 Second component force X Forging material flow direction Z Stress due to material flow

Claims (7)

A forging material is set and a material setting space into which a molding punch for applying a compressive force to the forging material is inserted, and a molding die having a stepped mold for forming a stepped portion, In a forging die for forging a product having a stepped portion by plastically flowing the set forging material,
The step forming mold includes an extending portion that extends in a direction intersecting the direction in which the forging material plastically flows,
The extended portion includes a corner upstream portion formed on the upstream surface side that receives the flow of the forging material, a top surface connected to the corner upstream portion and formed in the material flow direction, and the corner upstream portion. And a downstream corner portion forming an opposite surface on the downstream side of
The top surface is formed by a first inclined surface that gradually forms a material flow channel along the material flow direction,
The forging die , wherein the corner downstream portion is formed by a second inclined surface that gradually reduces the material flow channel toward the downstream side of the opposite surface . A forging material is set and a material setting space into which a molding punch for applying a compressive force to the forging material is inserted, and a molding die having a stepped mold for forming a stepped portion, In a forging die for forging a product having a stepped portion by plastically flowing the set forging material,
The step forming mold includes an extending portion that extends in a direction intersecting the direction in which the forging material plastically flows,
The extended portion includes a corner upstream portion formed on the upstream surface side that receives the flow of the forging material, a top surface connected to the corner upstream portion and formed in the material flow direction, and the corner upstream portion. And a downstream corner portion forming an opposite surface on the downstream side of
The top surface is formed by a first inclined surface that gradually increases a material flow channel along the material flow direction, and generates a first component force in an anti-material flow direction opposite to the material flow direction. A forging die having a one-component force generating region . A forging material is set and a material setting space into which a molding punch for applying a compressive force to the forging material is inserted, and a molding die having a stepped mold for forming a stepped portion, In a forging die for forging a product having a stepped portion by plastically flowing the set forging material,
The step forming mold includes an extending portion that extends in a direction intersecting the direction in which the forging material plastically flows,
The extended portion includes a corner upstream portion formed on the upstream surface side that receives the flow of the forging material, a top surface connected to the corner upstream portion and formed in the material flow direction, and the corner upstream portion. And a downstream corner portion forming an opposite surface on the downstream side of
The corner downstream portion is formed by a second inclined surface that gradually reduces the material flow path toward the downstream side of the opposite surface, and generates a second component force in the opposite material flow direction opposite to the material flow direction. A forging die comprising a second component force generation region to be caused . The said corner upstream part is formed by the smooth curved surface, and is provided with the raw material flow receiving area which receives the flow of the said forge raw material to the said top surface side. Mold for forging. The extending portion, to the mold surface adjacent to the stepped portion forming die, any of claims 1 to 4, characterized in that it has an extending direction height corresponding to the stepped portion height of the product Mold for forging according to crab. A method for producing a product having a stepped portion by forging using the forging die according to any one of claims 1 to 5 ,
A direction in which a compression force is applied to the forging material supplied to the material set space by the forming punch and intersects with a direction in which the forging material plastically flows by the extending portion of the step forming die. A method of manufacturing a product having a stepped portion, wherein the stepped portion is formed. The product having a stepped portion is a scroll member applied to a scroll fluid machine, and the stepped portion is a stepped portion in a lap height direction formed on a lap bottom surface of the spiral wrap. The manufacturing method of the product which has the step part of Claim 6 .

Images