JPH0567409B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold for molding an impeller model used for a turbine blade wheel or the like.

[Conventional technology]

Conventionally, impellers used for turbine impellers such as turbines of automobiles equipped with a turbocharger have been used for various tests, researches, castings, etc., as shown in the model diagrams of FIGS. 1 to 3. Therefore, a precise resin molded model is required.

Such an impeller model 3 is integrally formed with a plurality of blades 2 that are three-dimensionally bent on the outer surface of the shaft body 1 and have a tip end surface 2aa.

When molding the impeller model 3, for example, a mold in which a plurality of soluble cores or ceramic cores are assembled, a mold for divided blades, a mold for assembling finely divided metal slide cores for each molding, etc. are used. The impeller model 3 was molded by injecting molten resin into the mold.

[Problem to be solved by the invention]

However, even though accuracy is extremely important for models, conventional molds use high injection molding pressures due to the need to improve accuracy, resulting in core cracks and core misalignment during molding. As a result, there are drawbacks such as non-forming, defective product wall thickness, etc., and therefore, there is a problem that mass productivity is poor.

In addition, the dimensions and wall thickness accuracy of blades that are complicatedly bent in three dimensions are likely to be defective, resulting in poor overall yields and high costs due to poor resin molding process and product balance. .

This invention was made in order to solve the problems of the prior art described above, and is an impeller model molding method that shortens the impeller model molding process, improves product precision, and significantly improves product yield. The purpose is to provide molds.

[Means to solve the problem]

A fixed mold for forming a lower surface of a blade cavity, a movable mold for forming a side surface of a blade cavity that can be separated and assembled along a radial direction guide formed on the fixed mold for forming a lower surface of a blade cavity, and a movable mold for forming a side surface of a blade cavity. An impeller model molding die comprising a fixed mold for forming a lower surface and a movable mold for forming a blade cavity lower surface that can be moved relatively close to each other and moving away from each other, the movable mold for forming a blade cavity side surface comprising:
It is characterized by being divided into a plurality of parts in the circumferential direction along the center line of the tip width of the blade cavity tip wall surface corresponding to the blade tip surface of the impeller model to be molded.

[Effect]

In the impeller model molding die of the present invention, the movable mold for forming the blade cavity side surface is moved in the circumferential direction along the tip width center line of the blade cavity tip wall surface corresponding to the blade tip surface of the impeller model to be molded. By dividing the mold into a plurality of parts, the direction in which the burrs are generated and the direction in which the mold is removed are the same, and problems such as damage to the model caused by being pulled by the burrs during demolding do not occur.

〔Example〕

Next, an embodiment of the present invention will be described based on the drawings from FIG. 4 onwards.

FIG. 4 is a sectional view of an impeller model mold 4 showing an embodiment of the present invention. In Figure 4, A
is a fixed type for forming the lower surface of a blade cavity, and a circular frame 7 is fixed to a lower support plate 5 provided on a base (not shown) via a spacer block 6, and a center core 8 is installed approximately at the center of the circular frame 7. have. A plurality of rail grooves 9 are radially provided on the upper surface of the circular frame 7 as radial direction guides. Further, as shown in FIG. 14, the circular cavity 10 of the circular frame 7 has
A cam plate 13 is provided with linear holes 12 arranged in a spiral manner and having the same number of linear holes 12 as the rail grooves 9 in total. This cam plate 13 is connected to the circular frame 7
It is connected to an arm 15 connected to an actuator such as an air cylinder (not shown) through a slit 14, and is rotatable.

B is a movable mold for forming a blade cavity side surface, which is a combination of a movable mold for forming a blade side surface 16 and a movable mold for forming a blade tip surface 20, and a movable mold for forming a blade cavity side surface. Mold B is circumferentially divided into a plurality of movable molds for forming blade cavity side surfaces. C
is a movable mold for forming the upper surface of the blade cavity, and an annular mold 23 for forming the upper surface of the blade cavity 17 is fixed approximately at the center of an upper support plate 22 that is connected to a ram (not shown) and moves up and down. 23 has a guide hole 25 for the resin injection hole 24.

A fixed mold 27 having an annular recess 26 flush with the lower surface of the forming mold 23 and slidably on the upper surface of the movable mold 20 for forming the blade tip surface is attached to the mold 2.
3, and is fixed to the upper support plate 22. The annular tapered surface 28 inside the recess 26 of the fixed mold 27 contacts and presses the rear annular tapered surface 29 of the movable mold 16 for forming each blade side surface when assembled.

Further, a plurality of bushes 30 are buried on the sides of the fixed mold 27, and a plurality of guide pins 31, which are erected on the spacer blocks 6 of the lower support plate 5 and implanted in the frame 7, are inserted and separated. I let them do what they want.

The molding nozzle 32 is connected to a lifting device (not shown), and the spout 33 at the tip thereof is seated in the guide hole 25 of the upper support plate 22.

Below is the movable type B for blade cavity side surface formation.
Now, one of the movable molds for forming the blade cavity side surface, which is divided into a plurality of parts in the circumferential direction, will be explained in detail with reference to FIGS. 5 to 12.

5 to 7, reference numeral 16 denotes a movable mold for forming a blade side surface of the movable mold B for forming a blade cavity side surface, and a blade cavity side wall surface 18 shown by cross hatching in the drawings is fixed inward. Furthermore, a slider 19 is provided below. The upper surface 16a of this blade side surface forming movable mold 16 has a fan-shaped planar shape. The blade cavity side surface forming movable mold B, which is integrated by the combination of the blade side surface forming movable mold 16 and the blade tip surface forming movable mold 20, has side surfaces 16a' and 16.
a'' are brought into contact with other molds and combined into an annular shape as shown in FIG. 13. Reference numeral 29 denotes a rear annular tapered surface of the movable mold 16 for forming the blade side surface.

Next, in FIGS. 8 to 10, the movable mold 16 for forming the blade side surface and the movable mold 20 for forming the blade tip surface are combined.

The blade tip surface forming movable mold 20 has a curved surface 20b, and this curved surface 20b closely contacts the shroud surface 16b of the blade side surface forming movable mold 16, and the blade cavity tip wall surface 20c of the blade cavity side wall surface 18. It is made to form.

FIG. 11 is a diagram showing a perspective view of FIG. 9;
The movable mold for forming the blade cavity side surface is formed by combining the movable mold for forming the blade side surface 16 and the movable mold for forming the blade tip surface 20.
c. The blade cavity shaft surface 20d forms a side wall surface of the cavity 17 (shown in FIG. 4).

FIG. 12 is a cross-sectional view of FIG. 9, and the movable mold for forming the side surface of the blade cavity is
A movable mold 20 for forming a blade tip surface is integrally fixed onto a movable mold 16 for forming a blade side surface. As shown in phantom lines, the movable mold for forming a blade cavity side surface and another movable mold for forming a blade cavity side surface adjacent to the movable mold for forming a blade cavity side surface are shown in FIG. Cavity tip surface 2
The blade cavity of the impeller model is formed by the blade cavity side wall surface of the other movable blade cavity side wall surface for forming the blade cavity side surface and the blade cavity tip surface shown by 0c and the imaginary line. Note that the blade cavity tip wall surface is formed by the blade cavity side surface forming movable mold and another blade cavity side surface forming movable mold adjacent to each other shown by imaginary lines. Since the wall surface is divided along the tip width center line,
The blade cavity tip wall surface 20c corresponds to approximately half the blade tip thickness of the impeller model to be molded.
is formed on the movable mold 20 for forming the blade tip surface of the movable mold for forming the blade cavity side surface.

Then, each slider 19 of each blade side surface forming movable mold 16 shown in FIGS.
In the figures and FIG. 14, the roller 21 is engaged with the rail groove 9 of the circular frame 7 and can slide forward and backward, and is further provided under the slider 19 of the movable mold 16 for forming the blade side surface. Board 1
It engages with the linear hole 12 of No. 3 and rolls. Due to the rolling of the rollers 21, each slider 19 engages with each rail groove 9 and slides, and both the movable mold 16 for forming the blade side surface and the movable mold 20 for forming the tip surface of the blade move forward, assemble, and exit. It can be separated freely.

In addition, since linear holes 12 are formed in the cam plate 13 alternately in a spiral manner so as to produce a phase difference, each of the rollers 21 is guided by contact with each hole.
As a result, the movable molds 16 for forming each blade side surface and the movable molds 20 for forming each blade tip surface can be smoothly separated and assembled.

The operation of the above configuration will be explained below.

In the above-described configuration, when the impeller model 3 is formed using the impeller model mold 4, when the actuator (not shown) is actuated to screw the arm 15, the cam plate 13 rotates in the normal direction, and the linear hole 12 The rollers 21 roll while being guided by each slider 19.
is advanced along the rail groove 9. As a result, as shown in FIGS. 13 and 15, a movable mold 16 for forming each blade side surface and a movable mold 20 for forming each blade tip surface
The movable molds for forming the blade cavity side surface that are integrated with the blade cavity side surface are concentrated in the center, and each side 16a'16a'' of each movable mold for forming the blade side surface 16 coincides with each other, and the movable molds 16 for forming the blade side surface are aligned. The side surface is brought into contact with and integrated with the center core 8. That is, the blade cavity side surface forming movable mold shown in FIG. 11 is combined with another divided blade cavity side surface forming movable mold (not shown). This results in a movable mold B for forming the blade cavity side surface.Then, the ram (not shown) is lowered to remove the upper support plate 2.
When the upper support plate 22 is lowered, the guide pin 31 installed upright on the lower support plate 5 touches the bush 30 of the upper support plate 22.
are inserted and fitted to connect the upper support plate 22 and the lower support plate 5.
The blade cavity 17 is formed by lowering the upper support plate 22 and joining the blade cavity upper surface forming mold 23 to the blade tip surface forming movable mold 20.

At this time, the inner annular tapered surface 28 of the fixed mold 27 of the upper support plate 22 comes into contact with the rear annular tapered surface 29 of the movable mold 16 for forming each blade side surface, and is pushed out.
The movable molds for forming blade cavity side surfaces, each of which is made up of the movable molds 20 for forming blade tip surfaces and the movable molds for forming blade side surfaces 16, are assembled in the center and are integrally combined and locked.

Next, the molding nozzle 32 is lowered via a lifting device (not shown), and its distal end spout 33 is centered and seated in the guide hole 25 of the mold 23 to complete mold clamping.

Therefore, a thermoplastic synthetic resin such as plastic was injected at a set pressure to form the blade cavity 17.
The impeller model 3 is formed by injecting it in a molten or semi-molten state and hardening it.

Next, the molding nozzle 32 is raised and separated via the lifting device, and the blade cavity upper surface forming mold 23 of the upper support plate 22 is raised and released, so that the impeller model 3 is exposed as shown in FIG. be done.

Then, as shown in FIG. 16, when the arm 15 is reversely rotated by the reverse action of the actuator and the cam plate 13 is reversely rotated, the slider 19 is moved along the rail groove 9 by the cam follower action of the roller 21 with respect to the linear hole 12. The movable molds 16 for forming the blade side surfaces and the movable molds 20 for forming the blade tip surfaces are separated as shown by the arrows in FIG. 13 and removed from the molded product 3, completing the mold opening.

It should be noted that the embodiments of the present invention are of course not limited to the above-mentioned embodiments; for example, the upper support plate 22 and the molding nozzle 32 may be integrated,
Various aspects can be adopted, such as allowing the lower support plate 5 to be raised.

〔Effect of the invention〕

As described above, according to the present invention, in the impeller model mold structure used for various turbine impellers, etc., the movable mold for forming the blade cavity side surface provided on the lower support plate is divided into multiple parts in the circumferential direction and separated along the radial direction guide. Since they can be assembled freely, an impeller model having complicated three-dimensional bending can be molded, and in particular, the precision of the blade parts can be obtained as designed.

Furthermore, by separating and assembling the movable molds for forming the blade cavity side surface in the radial direction, it is possible to mold a complex impeller model with three-dimensional bending, which shortens the molding process and shortens the molding time. , which has an excellent effect of increasing molding efficiency.

In addition, the movable mold for forming the blade cavity side surface significantly improves the dimensional accuracy of the impeller shroud diameter, eliminates dimensional variations, and has the excellent effect of improving yield.

Therefore, there are advantages in that the cost can be significantly reduced and the frequency of product inspection can be reduced.

Furthermore, in the present invention, the movable mold for forming blade cavity side surfaces forms a plurality of blade cavity side surfaces along the center line of the tip width of the blade cavity tip wall surface corresponding to the blade tip surface of the impeller model to be molded. Since the mold is divided into movable molds, the direction in which the burrs are generated and the direction in which the mold is removed are the same, and when the mold is released, problems such as the model being pulled by the burrs and being damaged do not occur.

[Brief explanation of the drawing]

Fig. 1 is a plan explanatory view of the impeller model, Fig. 2 is an explanatory cross-sectional view of Fig. 1, and Fig. 3 is an explanatory side view of the same.
Figure 4 and the following are explanatory diagrams of one embodiment of the present invention. Figure 4 is an explanatory diagram of the entire mold structure, and
The figures show the front, side, and top views of one of the plurality of movable molds for forming blade cavity side surfaces, 8th, 9th,
Figure 10 is a front view and a side view of one movable mold for forming a blade cavity side surface of the movable mold for forming a blade cavity side surface, which is composed of a movable mold for forming a blade side surface and a movable mold for forming a blade tip surface. ,
A plan view, FIG. 11 is a perspective view of FIG. 9, FIG. 12 is a cross-sectional view of FIG.
FIG. 14 is a plan view of the cam plate, and FIGS. 15 and 16 are explanatory views of the mold opening. 5... Lower support plate, 16... Movable mold for blade side surface formation, 22... Upper support plate, 23... Upper surface forming mold, 4... Impeller model mold, 9... Guide, 20... Blade Movable type for forming the tip surface.

Claims (1)

[Scope of Claims] 1. A fixed mold for forming the lower surface of the blade cavity, and a movable mold for forming the side surface of the blade cavity that can be separated and assembled along a radial direction guide formed on the fixed mold for forming the lower surface of the blade cavity. The mold and
An impeller model molding die comprising a movable mold for forming a blade cavity lower surface that faces the fixed mold for forming a blade cavity lower surface and can be moved toward and away from the blade cavity, the movable mold for forming a blade cavity side surface comprises:
An impeller model molding die, characterized in that the blade cavity end wall surface is divided into a plurality of parts in the circumferential direction along the center line of the end width of the blade cavity end wall surface corresponding to the blade end surface of the impeller model to be molded.