JP2712918B2 - Impeller molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for molding a resin impeller used as a compressor wheel of a turbocharger for an internal combustion engine, for example.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show an apparatus for forming a so-called backward type impeller W in which long and short blades B ₁ and B ₂ are inclined at a predetermined angle with respect to a center axis as shown in FIG. (A similar structure is disclosed in, for example, Japanese Patent Application Laid-Open No. 62-117).
No. 717.

[0003] In this molding apparatus, as shown in FIGS. 7 and 8, two types of core blocks 1 and 2 formed to be inclined in accordance with the shapes of the blades B ₁ and B ₂ of the impeller W are arranged around a core pin 3. A plurality of core blocks 1 and 2 are arranged alternately along the circumferential direction of the impeller W, and the plurality of core blocks 1 and 2 are circular upper mold 4 and lower mold 5 as shown in FIGS.
And the mold is clamped from above and below.

On the back surface of each of the core blocks 1 and ₂ , recesses 6 and 7 corresponding to the shapes of the blades B ₁ and B ₂ to be formed are formed, and on the front surface side, the recesses 6 and 7 are formed.
Are formed, and by combining the core blocks 1 and 2 as described above, the blades B ₁ and B ₂ are formed between the core blocks 1 and 2 as shown in FIG. Are formed, and the impeller W shown in FIG. 6 is formed by filling a predetermined resin material through the sprue wash 10.

The upper mold 4 and the lower mold 5 are fixed to respective mold plates 11 or 12. The core blocks 1 and 2 are integrally connected to the respective rods 29 and 30. The core block 1 is driven by a drive mechanism (not shown) according to the closing and opening operations of the upper and lower dies 4 and 5, respectively. a
Similarly, the core block 2 is also slid in the direction of arrow b by the operation of a drive mechanism (not shown) and simultaneously rotates by a predetermined amount in the direction of c. When the core blocks 1 and 2 are opened, mutual interference between the core blocks 1 and ₂ and between the molded blades B ₁ and B ₂ and the core blocks 1 and 2 are avoided.

[0006]

In the conventional molding apparatus as described above, each of the core blocks 1, 2 and the upper and lower dies 4,
5, the lower mold 5 is formed with a receiving recess 13 for receiving the core blocks 1 and 2, while the upper mold 4 is formed with a top 1 having a mountain-shaped cross section of the core block 1.
A peripheral groove 15 having a V-shaped cross section is formed which is taperedly connected to the upper and lower dies 4 and 5.
The core blocks 1 and 2 and the upper and lower dies 4 and 5 are fitted in the receiving recess 13 and the circumferential groove 15 so that the impeller W is positioned in the radial direction. Will be.

However, when the positioning of each of the core blocks 1 and 2 in the circumferential direction of the impeller is considered, FIG.
As shown in FIG. 1, each of the core blocks 1 and 2 is simply brought into close contact with each other at the mating surfaces 18 and 19 including the inclined portions.
Moreover, since the minimum gap is set so that no burrs are generated on the mold mating surfaces 18 and 19, when the upper and lower dies 4 and 5 are clamped as described above, the respective core blocks 1 and 2 are pressed by the clamping pressure. 2 falls by a predetermined amount e in the inclination direction. As a result, the shape accuracy and the position accuracy of the blades B ₁ and B ₂ are reduced, and burrs are generated on the mold matching surfaces 18 and 19 due to enlargement of the gaps on the mold matching surfaces 18 and 19, which is not preferable. . These phenomena become more remarkable as the inclination angles of the core blocks 1 and 2 increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a structure in which the core block is prevented from falling down, which causes a reduction in blade shape accuracy and the generation of burrs.

[0009]

SUMMARY OF THE INVENTION The present invention is directed to an apparatus for molding an impeller having a plurality of radial blades inclined with respect to the center axis of the impeller from a resin, the apparatus comprising a plurality of blades inclined along the shape of the blade. While arranging the core blocks radially along the circumferential direction of the impeller, and pressing the upper and lower mold clamping pressure from above and below while regulating the radial position of the plurality of core blocks, the plurality of core blocks and In an apparatus in which a resin material is filled into a product part space formed by an upper and lower mold to form an impeller, a contact surface between the core block and an upper mold and a lower mold has a core block in an impeller circumferential direction. And a positioning fitting portion for controlling the positioning of the head.

The positioning fitting portion is a combination of a concave portion and a convex portion. For example, a positioning concave portion is formed on the core block side, while a positioning convex portion which fits into the core block side positioning concave portion is formed on the upper and lower mold sides. Form.

[0011]

According to this structure, since the position of each core block in the circumferential direction is restrained by the above-described positioning fitting portion, each core block does not fall down even when receiving the mold clamping pressure.

[0012]

1 to 5 show an embodiment of the present invention.
Portions common to the conventional example shown in FIGS. 7 to 11 are denoted by the same reference numerals.

As shown in FIGS. 1 to 3, a V-groove 20 is formed along the radial direction of the impeller W on the upper end surface of the top portion 14 of one of the two types of core blocks 1 and 2. On the other hand, on the inner bottom surface of the peripheral groove 15 on the upper die 4 side corresponding to the top portion 14 of the core block 1, a ridge 21 is formed to fit into the V-groove 20. 21 forms a positioning fitting portion 22 for positioning the core block 1 and the upper die 4 in the radial direction of the impeller.

A cutout groove 23 is formed in the outer periphery of the lower end of the core block 1 while the receiving recess 13 on the lower mold 5 side is formed.
As shown in FIG. 4, a projection 25 is formed on the inclined surface 24 so as to fit into the notch groove 23.
Positioning fitting portion 26 that controls the positioning of core block 1 and lower mold 5 in the impeller radial direction by means of
Are formed.

In the molding apparatus thus constructed, as shown in FIGS. 1, 2 and 5, two types of core blocks 1 and 2 are alternately arranged along the circumferential direction of the impeller as in the prior art. The upper and lower dies 4, 5 are clamped to clamp the plurality of core blocks 1, 2 from above and below.
And the notch 23 and the projection 2
And 5 are mutually fitted.

As a result, one core block 1 of the two types of core blocks 1 and 2 has a top 14 having a mountain-shaped cross section.
Is in tapered contact with the circumferential groove 15 of the upper mold 4, while the lower ends of both core blocks 1 and 2 are fitted into the receiving recesses 13 of the lower mold 5, whereby each core block 1 and 2 is radially aligned. The positioning is performed, and at the same time, the V groove 20 and the ridge 2 are used.
1 and the notch groove 23 and the protrusion 25, the core block 1 is positioned in the circumferential direction,
Further, the other core block 2 sandwiched between the adjacent core blocks 1 and 1 is also positioned in the circumferential direction, and the core blocks 1 and 2 are mutually positioned on the mating surfaces 18 and 19 in FIG. Adhere to

Therefore, even if the core blocks 1 and 2 receive the clamping pressure of the upper and lower dies 4 and 5, the position of one of the core blocks 1 in the circumferential direction is restricted by the positioning fitting portions 22 and 26. And core blocks 1,1
The circumferential position of the core block 2 sandwiched between them is also restricted by the core block 1, so that the core blocks 1 and 2 do not fall down.

[0018]

As described above, according to the present invention, the positioning fitting portion for controlling the positioning of the core block in the circumferential direction of the impeller is formed on both contact surfaces of the core block and the upper and lower dies. It can prevent the core block from falling down in the circumferential direction due to the clamping pressure of the upper and lower dies, improve the shape and position accuracy of the impeller blade to be molded, and align the core blocks. This has the effect of preventing burrs on the surface.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a mutual relationship between two types of core blocks.

FIG. 3 is a perspective view of the upper mold in an inverted state.

FIG. 4 is a perspective view of a lower mold.

FIG. 5 is a cross-sectional view showing a developed shape along the line AA in FIG. 1;

FIG. 6 is a perspective view of an impeller.

FIG. 7 is a sectional view of a conventional molding apparatus.

FIG. 8 is a perspective view showing a mutual relationship between two types of core blocks in a conventional molding apparatus.

9 is a perspective view of the upper mold shown in FIG. 8 in an inverted state.

FIG. 10 is a perspective view of a lower mold shown in FIG. 8;

FIG. 11 is a cross-sectional view showing a developed shape in a BB cross section of FIG. 7;

[Explanation of symbols]

1, 2, core block 4, upper mold 5, lower mold 8, 9, product space 20, V groove 21, ridge 22, positioning fitting 23, notch groove 25, projection 26, positioning fitting B ₁ , B ₂ … blade W… impeller

Claims (1)

(57) [Claims] 1. An apparatus for molding an impeller having a plurality of radially inclined blades with respect to a center axis of an impeller using resin, and forming a plurality of core blocks inclined along the shape of the blades with a circle of the impeller. A product formed by the plurality of core blocks and the upper and lower molds while being arranged radially along the circumferential direction, and by pressing the upper and lower molds with the mold clamping pressure of the upper and lower molds while regulating the radial position of the plurality of core blocks. An apparatus in which an impeller is formed by filling a space with a resin material, wherein a positioning fitting portion for positioning a core block in a circumferential direction of an impeller on a contact surface between the core block and an upper die and a lower die. A molding device for an impeller, characterized in that an impeller is formed.