JPH07100211B2 - Mold for bladed rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) [0001] The present invention relates to a molding die used for molding a blade-shaped rotating body having a plurality of blades having a twist.

(Prior Art) FIGS. 7 and 8 are views showing an impeller (intake side) for a turbocharger of an automobile as an example of a blade-shaped rotating body.

The impeller 100 in the drawing is such that the diameter of one end side of the shaft portion 100a is gradually increased to connect the flange portion 100b, and a plurality of blades 100c are integrally provided on the outer circumference of the shaft portion 100a, and the shaft portion is provided with an axis. It has a hole of 100g. Each blade 100c extends in a substantially radial direction on the small diameter side of the shaft portion 100a, reaches a flange portion 100b in a loose spiral shape, and is twisted in the flange portion 100b to extend in a substantially axial direction. Also,
In the blade 100c, a side 100d on the small diameter side of the shaft portion 100a is inclined in the rotation direction of the impeller 100 (direction of arrow in the figure) by an angle A with respect to a radial line as shown in FIG. At the same time, the side 100e on the side of the flange portion 100b has an angle B smaller than the angle A with respect to the axial line as shown in FIG.
Is inclined at. Furthermore, the angle C in FIG.
The end of the tip ridge 100f that is continuous from the side 100d on the small diameter side of 0a,
It is the angle formed by the line in the axial direction. Impeller 10 above
0 is for increasing the angle C and improving the supercharging efficiency by the blade 100c having the above-described twisted shape, and was manufactured based on a precision casting method such as the lost wax method.

An apparatus for forming a blade-shaped rotating body is disclosed in, for example, Japanese Patent Publication No. 58-12102. In this device, a divided mold corresponding to the shape of each blade can be moved forward and backward in a radial direction by a pressure cylinder below an upper mold that moves up and down. After casting the molten metal in the cavity formed between and, the blade-shaped rotating body having a plurality of blades can be taken out by moving each split die in the outward direction of the die as the upper die moves. ing.

(Problems to be Solved by the Invention) Here, in the above-mentioned device, the productivity of the blade-shaped rotating body is improved so that the cost can be reduced. Since it is a structure that advances and retracts, it can be applied to a blade having a blade whose shape change in the radial direction is extremely small. In other words, the twisted blade 100c described above
It is clear that mold release is impossible with the impeller 100 having Therefore, conventionally, there is no molding die for molding the blade-shaped rotating body such as the impeller 100, and the realization thereof has been desired.

(Object of the Invention) The present invention has been made in view of such conventional demands, and it is possible to mold a blade-shaped rotating body provided with blades having a complicated twist, and at the time of opening and closing the mold. It is an object of the present invention to provide a blade-shaped rotating body molding die in which the operation of each part is smooth and reliable, maintenance is easy, and the die can be downsized.

[Structure of the Invention] (Means for Solving the Problems) A blade-shaped rotary body molding die according to the present invention is a blade-shaped rotary body molding die having a plurality of blades having a twist, and is opposed to each other. A mold structure is provided in which a divided mold corresponding to the shape of each blade is arranged between one mold and the other mold that are close to and away from each other, and a cavity for the blade-shaped rotating body is formed between the molds. Then
A slide surface inclined to the outside of the mold and an ejector that holds a support body facing the slide surface slidably in substantially the inside and outside directions of the mold and is movable in the approaching and separating directions in the one mold. In addition, the split die is rotatably connected to the support body through a shaft portion in the blade twisting direction, and either one of the one die and the split die corresponds to the twisting of the blade. And a bending guide portion is provided, and an engaging portion that slidably engages along the guide portion is provided on the other side.

(Example) Hereinafter, the present invention will be described with reference to the drawings.

1 to 6 are views for explaining an embodiment of the present invention. In this embodiment, the impeller 100 (FIGS. 7 and 8) which is the blade-shaped rotating body described in the section of the prior art is used.
(See the figure) is illustrated.

That is, as shown in FIG. 1, the molding die 1 is provided between a movable die 2 (one die) and a fixed die 3 (other die) which face each other and approach and separate in a substantially horizontal direction. The split mold 4 corresponding to the shape of the blade 100c is provided, and the impeller 1 is provided between the molds 2, 3 and 4.
It has a mold structure that forms a cavity 5 corresponding to 00. The split dies 4 have the same number as the blades 100c, and are arranged radially around the cavity 5.

In the movable mold 2, a plate-shaped spacer 8 is fixed by a plurality of screws 7 to the outer surface of the mold of a holder 6 which can be reciprocated by a movable means (not shown), and at the center of the holder 6,
Fix the core 9 extending in the direction of the fixed mold 3 with the bolt 10,
Further, a ring-shaped frame block 11 is fixed by bolts 12 on the entire inner surface of the mold on the inner surface of the holder 6. Then, between the core 9 and the frame block 11, from the center side,
An annular ejector 13 and an annular guide block 14 which are movable in a direction of moving toward and away from the fixed die 3 are concentrically provided.

The core 9 has a shaft portion 100a of the impeller 100 at the tip.
Has a molding portion 9a corresponding to the small-diameter end portion, and has a hole portion 9b communicating with the molding portion 9a and opening to the base end surface of the core 9 on the axis, and further formed near the tip portion. A slide surface 9c inclined outward from the mold is formed on the outer periphery of the bulging portion. The hole 9b has a shape in which the inner diameter increases stepwise toward the base end of the core 9, and the eject pin 15 is slidably inserted therein. The eject pin 15 has a shaft hole 100g of the impeller 100 at its tip.
In addition to having a small diameter portion 15a for forming, a flange portion 15b that abuts the inward flange 6a formed in the core fitting portion of the holder 6 from the inside of the mold is provided in the vicinity of the base end portion. Further, in the eject pin 15, a liner 16 is fitted to an outer peripheral portion extending from substantially the center to the base end of the small diameter portion 15a, and a spring 17 is provided between the step portion in the hole 9b and the flange portion 15b. Is interposed in the state of being urged in the direction away from the fixed mold 3. Further, a retractable push pin 46 containing a spring is inserted in the core 9 in a state substantially perpendicular to the slide surface 9c. The push pin 46 has a core 9 at the base end on the slide surface 9c side.
A ball 18 that is screwed into the liner 16 and engages with the conical engagement hole 15c of the eject pin 15 through the hole formed in the liner 16.
Is pressed by the tip. The engagement hole 15c is in a position to engage the ball 18 when the flange portion 15b of the eject pin 15 is in contact with the inward flange 6a.

The ejector 13 fixes a pressure receiving member 19 projecting into the through hole 6b formed in a continuous manner with the holder 6 and the spacer 8 on a surface facing the holder 6 with a bolt 20 and also holds the holder 6
A stripper bolt 21 is slidably passed through the holder 6 and the head of the holder 6 is locked. Further, as shown in the right half of FIG. 1, the ejector 13 has a cross-section T open to the fixed mold 3 side inside the mold corresponding to the disposition of the split mold 4.
A slide groove 13a having a V-shape is formed in a direction substantially perpendicular to the slide surface 9c (obliquely upward right direction in the figure), and a support body 22 facing the slide surface 9c is slidably connected to the slide groove 13a. are doing. The ejector 13 is
As shown in the left half of FIG. 1, spacers 24 are fixed with bolts 23 inside the corresponding molds between the split molds 4.

As shown in FIG. 2, the support body 22 has parallel holding portions 22a and 22b extending in the direction of the fixed die 3 on the side facing the slide surface 9c and on the outer side of the die, Gib plate 2 having a T-shaped cross section that engages with the slide groove 13a.
5 is fixed. At this time, the gib plate 25 and the slide groove 13a have a form in which the overhang length of the upper portion in the T-shaped cross section gradually increases toward the outside of the mold. Therefore, the support body 22 is an ejector.
In the state where 13 is in contact with the holder 6, it is held so as to face the slide surface 9c at a constant interval. Further, the both holding portions 22a, 22a, the axial holes 22b, 22b are formed on the same line penetrating the both ends, and the through holes 22c, 22 having a rectangular cross section on the same line are formed on the base end side thereof.
have c.

The split mold 4 has a molding part 4a corresponding to the shape of the blade 100c, and is provided with first and second projecting parts 4b, 4c which are combined between the holding parts 22a, 22a and outside the mold. , A convex portion 4 which is fitted to a concave portion 32a formed on the inner surface of the mold of the holder 32 constituting the fixed mold 3 on the surface facing the fixed mold 3.
have e. Axial holes 4d and 4d are formed in the base end portions of the first and second protrusions 4b and 4c on the same line passing through them. Then, the split mold 4 is firstly attached to each of the holding portions 22a, 22a.
.Each shaft hole 22 that communicates with the second protrusions 4b, 4c in combination
A holding pin 26 as a shaft portion is inserted into b, 22b, 4d, 4d so as to be rotatably connected to the support body 22.
Incidentally. The inclination angle of the holding pin 26 is set so that the split mold 4 can be rotated in response to the twist of the blade 100c. In this embodiment, the axis is substantially perpendicular to the slide surface 9c. ing.

A guide hole 27 that opens inward and outward of the mold is formed in the first protruding portion 4b as a guide portion that bends in response to the twist of the blade 100c. The guide hole 27 has a cross-sectional shape in which linear portions 27a, 27a on both end sides are continuously provided at a bent portion 27b, and a guide pin 28 as an engaging portion that slidably engages along the cross-sectional shape. Through. The guide pin 28 is
The tip end is inserted into the end of the slide surface 9c on the fixed mold 3 side, and the base end is screwed into the frame block 11, and its axis is substantially perpendicular to the slide surface 9c. Hole 27
Has a diameter smaller than the width dimension of. The guide pin 28 passes through the through holes 22c, 22c of the support body 22. Therefore, the through hole 22c has a sufficient cross-sectional dimension so as not to interfere with the guide pin 28 when the support body 22 moves. Also, split type 4
The second protrusion 4c is also formed shorter than the first protrusion 4b in order to prevent interference with the guide pin 28.

The guide block 14 has a ball hole 14a that opens inward and outward of the mold near the base end on the holder 6 side, and the slide surface 9c at the tip is inclined outward in the mold.
It has a taper portion 14b that is parallel to. Two balls 29, 29 are provided in the ball hole 14a, and the balls 29, 29 are pressed inward by a push pin 30 which is inserted and fixed to the frame block 11 from the outside of the mold, One ball 29 is engaged with an engagement groove 13b formed on the outer circumference of the ejector 13. The guide block 14 has an opening for preventing the tapered portion 14b from contacting the outer surface of the second projecting portion 4c of the split mold 4 and interfering with the guide pin 28 when moving with the ejector 13. Have 14c.
Further, an engagement groove 11a used for engaging the ball 29 is formed on the inner periphery of the frame block 11 at a position slightly apart from the push pin 30.
The length from the center line of 0 to the center line of the engaging groove 11a is equal to the dimension in the movable mold moving direction in the gap provided between the support body 22 and the slide surface 9c.

In the fixed mold 3, a sprue 33 communicating with the cavity 5 is formed in the center of a holder 32 fixed to a base 31 with a plurality of screws 31a, and a push 34 forming an injection port and a cavity are formed inside the sprue 33. Core block 35 forming the bottom surface of 5
And are fixed with bolts 36. An annular block 37 for connecting a device for injecting a molten material, which is a material of the impeller 100, under pressure is fixed by a bolt 38 to the center of the outer surface of the mold of the holder 32. Further, the fixed mold 3 is provided with a return pin 39 extending to the movable mold 2 side at a position corresponding to each divided mold 4. The return pin 39 is
A fixed rod 40 whose base end is positioned in the holder 32, and a sleeve 41 slidably fitted on the outer side of the fixed rod 40.
And a coil spring 42 is interposed between the tip surface of the fixed rod 40 and the inner surface of the tip portion of the sleeve to urge the sleeve 41 toward the movable die 2. Further, the sleeve 41 has a flange portion 41a that is locked to the holder 32 at the base end in order to regulate the protrusion amount, and when the movable die 2 and the fixed die 3 are closed, the ejector 13
It comes into contact with the spacer 24 provided in the above, and moves the coil spring 42 to the fixed mold 3 side in a compressed state.

Flow paths 43a to 43d for circulating a cooling fluid are formed inside the holders 6, 32, the core 9 and the split mold 4, respectively. Further, reference numeral 44 in FIG. 1 denotes a connecting plate (shown by an imaginary line) for holding the movable mold 2 and the fixed mold 3 in a closed state. Secure to 3 with multiple bolts 45.

In the molding die 1 having the above structure, the movable die 2 and the fixed die 3 are closed (state of FIG. 1), and a molten material such as resin or metal is injected under pressure into the cavity 5. At this time,
The split mold 4 is positioned by fitting the convex portion 4e into the concave portion 32a of the holder 32 of the fixed mold 3, and the fitting is against the pressure at the time of molten material pressure injection.

Then, in the molding die 1, after the molten material is cooled and solidified, the movable die 2 is separated from the fixed die 3 as shown in FIG. At this time, the return pin 39 causes the sleeve 41 to project to the position where the collar portion 41a is locked to the holder 32 by the action of the spring 42. The impeller 100, which is a molded product, is attached to the movable mold 2 side.

Next, in the molding die 1, after moving the movable die 2 to a predetermined position, as shown in FIG. 4, the end faces of the eject pin 15 and the pressure receiving member 19 are pushed in by rods 47, 47 (indicated by phantom lines in the figure). (Shown) is pressed in the direction of the fixed mold 3. Then, the eject pin 15 moves so as to compress the spring 17 and push the ball 18 toward the push pin 46 side, and
100 is extruded from the tip of the core 9. Further, together with the ejector 13, the support body 22, the split mold 4 and the guide block 1
4, the support body 22 comes into contact with the slide surface 9c, and the engagement groove 13b of the ejector 13 and the engagement groove 11a of the frame block 11 face each other via the ball hole 14a. At this time, the split mold 4 does not rotate because it moves by the length of the one-side linear portion 27a of the guide hole 27 with respect to the fixed guide pin 28.

Then, as shown in FIG. 5, when the ejector pin 15 and the ejector 13 are further pushed until the head of the stripper bolt 21 is locked to the holder 6, the ejector pin 15 is ejected.
At 15 while pushing the impeller 100 completely out of the core 9,
The ball 29 of the guide block 14 is an engaging groove on the frame block 11 side.
By engaging with 11a, the guide block 14 is locked to the frame block 11 side. Further, when the ejector 13 further moves, the support body 22 slidable in the inner and outer directions (obliquely upward direction in each figure) of the mold with respect to the ejector 13 is guided to the slide surface 9c and the tapered portion 14b of the guide block 14. Then, it moves in the outward direction of the diagonal mold, and simultaneously moves the split mold 4 in the same direction.

At this time, in the split mold 4, as schematically shown in FIG. 6, the holding pin 26 for connecting to the support body 22 moves toward the fixed mold 3 (downward in the drawing). The bent portion 27b of the guide hole 27 with respect to the fixed guide pin 28
, The blade 100c rotates in the twisting direction around the holding pin 26 as it moves in an oblique direction. Therefore, the split mold 4 moves to the fixed mold 3 side together with the impeller 100 extruded by the eject pin 15, and also moves out of the mold while rotating to separate from the impeller 100. At the time of releasing the mold, the holder 6 may be further separated from the fixed mold 3 with the pushing rod 47 being in contact with the eject pin 15 and the pressure receiving member 19.

Next, in the molding die 1, when the impeller 100 is removed from the eject pin 15 and then the pushing rod 47 is retracted, the action of the spring 17 causes the eject pin 15 to move.
Moves, the collar portion 15b comes into contact with the inward flange 6a, and the ball 18 pressed by the push pin 46 is again engaged with the engaging hole.
The eject pin 15 is locked by engaging with 15c. Then, when the movable die 2 is moved to the fixed die 3 side, the molding die 1 first causes the return pin 39 to move the return pin 39.
To regulate the movement of the ejector 13. At this time, the spring 42 in the return pin 39 is
The impact caused by the contact between 39 and the spacer 24 is reduced. Here, the molding die 1 actually returns to the original state (state of FIG. 1) by the movement of the movable die 2 while the movement of the ejector 13 is restricted.
To explain that the support body 22 is moved to the side, the support body 22 is pulled inward in the mold along the slide surface 9c and the taper portion 14b, and the support body 22 is divided into four parts along with the support body 22.
Moves while rotating in the direction opposite to that at the time of mold release (state of FIG. 4). When the ejector 13 is further moved, the molding die 1 causes the guide block 14 to be again locked to the ejector 13 side via the ball 29, and the support body 22 and the split die 4 are moved to the holder 6 side. Ejector 13
When comes into contact with the holder 6, the movable die 2 returns to its original state.

As described above, in the molding die 1, each structure of the movable die 2 performs the above-described operation as the movable die 2 moves, and the cavity 5 is formed again between the movable die 2, the fixed die 3 and the split die 4.

That is, according to the molding die 1 described in the above embodiment, it is possible to easily mass-produce the impeller 100 including the blade 100c having a complicated twist in order to improve the supercharging efficiency. Further, the molding die 1 includes an ejector 13, a support body 2
Although the two and the split dies 4 are sequentially connected and the split dies 4 are moved in a complicated manner, the operation is smooth because the structure of the connecting portion by the guide groove 13a, the gib plate 25 and the holding pin 26 is simple. At the same time, the support block 22 and the split mold 4 that are less likely to break down and move along the slide surface 9c can be guided more reliably by the support block 14. Further, in the molding die 1, when the ejector 13 is in contact with the holder 6, the support body 22 and the slide surface 9c are opposed to each other with a predetermined gap, and the guide hole 27 in the split die 4 is provided. Is composed of linear portions 27a, 27a on both sides and a bent portion 27b. Therefore, the split mold 4 at the time of mold release is moved to the fixed mold 3 side once and then is moved to the outside of the mold while being rotated. As a result, the side 100d on the small diameter side of the blade 100c of the impeller 100 is moved. The split mold 4 can be released from the core 9 completely, and there is no possibility that the split mold 4 interferes with the core 9 or the impeller 100 is damaged.

The detailed structure of the molding die according to the present invention is not limited to the above embodiment. For example, the inclination angle of the sliding direction of the support body with respect to the ejector and the shaft portion (holding pin 26) for holding the split die. The angle of inclination of the axis of, the bent shape of the guide portion (guide hole 27), etc. can be appropriately changed in accordance with the allowable dimension in the mold and the twist angle of the blade of the blade-shaped rotating body. It is also possible to form a groove-shaped guide portion on the main body side (for example, a core) of one of the molds and to project the engaging portion guided along the guide portion in the split mold.
Further, in the above embodiment, the movable die is moved in the horizontal direction, but it may be configured to move the movable die in the vertical direction. In this case, the ejector is held in a state of being brought into contact with the holder. A lock mechanism or the like may be provided.

[Effects of the Invention] As described above, according to the blade-shaped rotating body forming die of the present invention, the blade-shaped rotating body forming die is provided with a plurality of blades having a twist, and is opposed to each other. It has a mold structure in which a divided mold corresponding to the shape of each blade is arranged between one mold that is close to and away from the other mold and a cavity for the blade-shaped rotating body is formed between each mold. An ejector that holds a slide surface inclined outward from the mold and a support body facing the slide surface in one of the molds so as to be slidable substantially inward and outward of the mold and movable in the approaching and separating directions. In addition, the split die is rotatably connected to the support body through a shaft portion in a twisting direction of the blade, and one of the one die and the split die is attached to the twisting of the blade. A guide part that bends correspondingly is provided, and on the other side, along the guide part Since the engaging portion that slidably engages is provided, it is possible to mold and easily mass-produce a blade-shaped rotating body having a blade having a complicated twist, and further, to divide the split mold according to the twist of the blade. Despite complicated movement, the operation of each part is smooth and reliable when the mold is opened and closed, and the structure of the movable connecting part, which is the main point of the above-mentioned operation, is simple, so maintenance is easy. At the same time, it has an excellent effect that it can sufficiently cope with the miniaturization of the mold.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view for explaining a forming die according to an embodiment of the present invention, FIG. 2 is a perspective view for explaining a support body and a split die, and FIG. 3 is a state in which a movable die is separated from a fixed die. 4 is a sectional view of an essential part for explaining a state in which the support body is in contact with the slide surface, and FIG. 5 is a sectional view of an essential part for explaining a state in which the split mold is separated from the impeller. FIG. 6 is a front explanatory view from the center of the mold that schematically shows a state in which the split mold rotates, FIG. 7 is a perspective view illustrating an impeller as an example of a blade-shaped rotating body, and FIG. It is a top view of the impeller shown in FIG. 1 ... Mold, 2 ... Movable mold (one mold), 3 ... Fixed mold (other mold), 4 ... Split mold, 5 ... Cavity, 9c ...
… Sliding surface, 13 …… Ejector, 22 …… Support body,
26: Holding pin (shaft), 27: Guide hole (guide surface), 28: Guide pin (engaging part), 100: Impeller (blade-shaped rotor), 100c: Blade.

Continuation of the front page (56) References JP-A-56-114564 (JP, A) JP-A-56-114565 (JP, A) Actual opening 62-189852 (JP, U) Actual opening Sho-56-50555 (JP , U)

Claims (1)

[Claims] 1. A mold for a blade-shaped rotating body having a plurality of blades having a twist, which corresponds to the shape of each blade between one mold and the other mold that face each other and face each other. And a mold structure in which a cavity for the blade-shaped rotating body is formed between the respective molds, and one of the molds has a slide surface inclined outward from the mold and a slide surface on the slide surface. An ejector, which holds the opposing support bodies slidably in the substantially inward and outward directions of the mold and is movable in the approaching / separating direction, is provided on the support body via a shaft portion of the split mold. A guide portion that is rotatably connected in a twisting direction is provided on one side of the one die and the split die and that bends in response to the twist of the blade, and on the other side, along the guide portion. Molding of a blade-shaped rotating body, characterized by having an engaging portion that slidably engages .