JP2002219553A - Casting device, cast-formed article, and scroll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cast-formed article, a scroll, and a casting device facilitating or dispensing with the flattening of a extruded face by a extruding material, and capable of reducing man-hours. SOLUTION: A cope 13 is a mold on the spiral side of a scroll 20, and on the cope 13 a extrusion hole 14 formed into approximately the same shape along the tip of a spiral 20a of the scroll and continuous is provided. In the extrusion hole 14, an extrusion material 15 is made to pass through. The tip of the extrusion material 15 reaches a cavity 6 of a metal mold. The extrusion face 15a of the extrusion material 15 is formed also into approximately the same shape as that of the tip of the spiral 20a. The scroll formed by the casting device of the constitution stated above causes no surface raggedness due to a conventional plurality of extrusion pin traces, and the tip 20a of the spiral of the scroll being the extruded face appears in the shape having a continuous flat part with uniform height by the integrated extrusion material 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting apparatus, a cast product produced by the casting apparatus, and a scroll in a scroll compressor.

[0002]

2. Description of the Related Art Conventionally, scrolls of, for example, scroll type compressors, which are cast products, have been generally manufactured by a die casting method, which is a kind of casting, as follows. As shown in FIGS. 5A and 5B, upper and lower molds 43 and 33 in which a casting cavity (cavity) of the scroll 50 is formed are installed at the center of the casting device 55 (FIG. 5). , For convenience, only scrolls that are molded products are indicated by hatching). Molten metal is poured into a cavity 36 formed by combining the upper and lower molds 43, 33, and after being cooled and solidified in the molds 33, 43, the scroll 50, which is a cast product, is punched out. . When the scroll 50 solidified in the molds 33 and 43 is pulled as it is by a robot arm or the like at the time of die removal, if the scroll 50 has a complicated shape like a spiral part, the mold may be subjected to contact resistance, Since there is a possibility that the scroll 50 remains in the upper and lower dies 43, 33, the rod-shaped pushing pins 45 provided in the upper die 43 are synchronized with the separation of the upper and lower dies 43, 33.
Thus, the spiral tip 50a is extruded. Further, the lower die 33 is also configured such that the base of the scroll 50 is extruded by the extrusion pin 35.

[0003]

However, in the above-described die cutting using the extrusion pins 35 and 45, the dies 33 and 43 are not used.
Since the pins are die-cast while being movably inserted into the extrusion pin holes 34, 44, the extrusion pins 35, 45
Due to poor positioning, abrasion and distortion, the tip shape varies between the push pins 35 and 45, and the height of the push pins 35 and 45 becomes uneven. 6 (c) and FIG. 7 appeared as pin mark irregularities 51. That is, when the push pin 45 slightly protrudes from the cavity forming surface as shown in FIG. 6A, a concave portion is formed in the spiral tip portion 50a, and slightly as shown in FIG. 6B. In the state of being immersed, a convex portion is formed. With such irregularities 51, even if the compressor is configured by assembling the movable scroll and the fixed scroll,
At the spiral tip portion 50a, a gap exceeding the allowable amount is formed between the opposing surface and the opposing surface based on the unevenness 51, which causes a problem that the refrigerant gas leaks. Therefore, processing for obtaining a uniform plane by cutting or the like is required. SUMMARY OF THE INVENTION An object of the present invention is to provide a casting apparatus which makes it easy or unnecessary to perform planar processing of a surface to be extruded and can reduce the number of processing steps, and a cast molded product and a scroll manufactured by the same.

[0004]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, a pair of casting molds which are arranged so as to be able to be separated from each other and form a cavity, and are provided on the molds. In a casting apparatus including an extrusion hole, an extruded material penetrated through the extrusion hole, an extruded plate to which the extruded material is attached, and driving means for moving the extruded plate up and down, an extruded surface of the extruded material is provided. The point is that the shape is continuously formed in substantially the same shape along the shape of the surface to be extruded of the cast molded product.

[0005] According to the above structure, there is no unevenness of the surface due to a plurality of conventional extrusion pin marks, and the surface to be extruded by a continuously integrated extruded material has a shape having a flat portion having a uniform height. .

According to a second aspect of the present invention, there is provided a scroll type compressor in which a fixed side scroll and a movable side scroll are meshed with each other in a spiral, and are used for casting the scroll. A pair of molds that are arranged so as to form a cavity, an extrusion hole provided in the mold, an extruded material penetrated through the extrusion hole, an extruded plate to which the extruded material is attached, and the extrusion In a casting apparatus comprising a driving means for vertically moving a plate, a surface to be extruded by the extruded material is a spiral tip of a scroll, and an extruded surface of the extruded material conforms to a shape of a spiral tip of a scroll. The point is that they are continuously formed in substantially the same shape.

[0007] According to the above structure, since the extruded material is extruded by a continuous and integral extruded material, there is no unevenness of the surface due to the traces of a plurality of conventional extrusion pins at the tip of the scroll, and a uniform height is formed at the tip of the scroll. It appears as a shape having a continuous flat portion.

According to a third aspect of the present invention, in the casting apparatus of the second aspect, the width of the spiral on the extrusion surface is formed to be smaller than the width of the tip of the spiral on the surface to be extruded. The gist is that the extruded material is positioned so that the material is projected into the cavity.

According to the above structure, a spiral-shaped groove having a predetermined width and depth is continuously formed at the tip of the spiral by the portion of the extruded material projecting into the cavity.

According to a fourth aspect of the present invention, there is provided a cast product formed by using the casting apparatus according to the first or second aspect, wherein the surface to be extruded has a continuous flat portion. I do.

According to the above structure, since the surface to be extruded (the tip of the spiral) has a flat portion, the flat processing is slightly or unnecessary.

According to a fifth aspect of the present invention, there is provided a scroll formed by using the casting apparatus according to the third aspect, wherein a spiral groove is continuously formed along a spiral tip of the scroll, and a sealing material is formed in the groove. Is to be attached.

According to the above structure, the processing of the seal groove is not required, and the number of steps can be reduced.

According to a sixth aspect of the present invention, in the casting apparatus of the second or third aspect, the cavity is characterized in that a surface corresponding to a side surface of a spiral of a scroll to be formed has a draft. .

According to the above structure, the contact resistance at the time of die cutting is small, and the die is easily cut.

According to a seventh aspect of the present invention, there is provided a scroll formed by using the casting apparatus according to the sixth aspect, wherein the draft of the side surface of the spiral of the movable scroll and the corresponding slope of the side surface of the spiral of the fixed scroll are formed. The point is that the draft angle is the same inclination angle.

According to the above structure, even when the movable scroll and the fixed scroll are not assembled, that is, in a so-called black skin state, the hermeticity between the side surfaces of the scroll can be ensured.

According to an eighth aspect of the present invention, there is provided the scroll according to the fifth aspect, wherein the inner surface of the groove formed at the tip of the spiral has a draft.

According to the above structure, the groove can be easily formed, and the sealing material along the gradient can be mounted to enlarge the tip surface of the sealing material, thereby improving the sealing performance of the contact surface.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) Hereinafter, a scroll having a spiral portion in a scroll type compressor embodying the present invention will be described as an embodiment with reference to FIGS.

As shown in FIGS. 1 (a) and 1 (b), a fixed mounting seat 1 is provided below the casting device 25 which is a device for manufacturing the scroll 20 of the compressor, in particular, the movable scroll. The mounting seat 1 is provided with a lower mold 3 of a mold via a stay 2 which is a bar. Lower die 3 is scroll 20
It is the type of the base side. The lower die 3 has an extrusion hole 4
The upper end is opened to a cavity 6 formed by a mold, and a rod-shaped extrusion pin 5 is passed through each of the extrusion holes 4. The tip of the push pin 5 reaches the mold cavity 6.

The base end of the push pin 5 is attached to the mounting seat 1.
The extruding plate 7 is attached to an extruding plate 7 located between the lower die 3 and the lower end of the lower die 3.
The extruding plate 7 is moved up and down by a piston cylinder 18 as a driving device.

That is, the die is removed when the extrusion plate 7 is raised, and the molten metal is poured and formed when the extrusion plate 7 is lowered.

On the other hand, a movable mounting seat 11 is provided on the upper side of the casting mold apparatus. The mounting seat 11 is connected to a piston cylinder or the like, which is a lifting drive (not shown). The mounting seat 11 can be moved vertically by this piston cylinder, and the upper die 13 and the lower die 3 can be joined. An upper die 13 of a die is provided on the mounting seat 11 via a stay 12 which is a bar. Upper die 13 is scroll 2
0 is the spiral side type. The side surface 13a of the spiral portion of the upper die 13 has a draft θ1. Further, the upper die 13 is provided with an extrusion hole 14 of substantially the same shape along the spiral shape at the tip of the scroll spiral 20a, and the lower end is opened to the cavity 6 formed by the die.
An extruded material 15 penetrates 4. This extruded material 1
The extrusion surface 15a of 5 reaches the cavity 6 of the mold. The pushing surface 15a is also formed substantially continuously along the tip of the spiral 20a. The extruded material 15
Is mounted on an extruding plate 17 located between the mounting seat 11 and the upper die 13, and the extruded material 15 moves up and down so that the tip of the extruded material 15 protrudes and retracts into the forming recess of the cavity 6. The lifting and lowering of the pushing plate 17 is performed by a piston cylinder 19 as a driving device.

That is, when the extruding plate 17 is raised with the mounting seat 11 lowered, the molten metal is poured and formed.
This is a configuration in which the die is removed when the push-out plate 17 is lowered together with the mounting seat 11 being raised. (Note that, in FIG. 1, for convenience, only the scroll, which is a molded product, is indicated by hatching.) The casting apparatus configured as described above is used as follows.

First, the upper die 13 moves downward together with the mounting seat 11 by the operation of the piston cylinder as a lifting / lowering drive device, and the upper die 13 and the lower die 3 are closed together by molding, whereby the cavity 6 is formed. You. The high-temperature molten metal is injected into the cavity 6 by a pouring plunger (not shown) through a pouring port (not shown) provided in the lower mold 3.

Here, the two dies 13, 3 are connected to the dies 13, 3
The molten metal press-fitted into the cavity 6 is effectively cooled and solidified because it is constantly cooled by cooling water flowing through a cooling pipe (not shown) stretched inside (in an actual manufacturing process, it takes about one minute). Cooling and solidifying).

Then, after the molten metal is solidified, the mounting seat 11 is raised, and the upper mold 13 is released from the lower mold 3. In synchronization with the rise of the mounting seat 11, the extruding plate 17 is lowered, and the scroll 20 is extruded from the upper die 13 by the extruded material 15, and the releasing, that is, the die-cutting is started.

At this time, the scroll spiral 20a is formed by the spiral continuous extrusion surface 15a of the extruded material 15.
Since the tip is entirely extruded, the scroll 20 is cut without leaving a part of the scroll 20 in the upper die 13. In addition, since the side surface 13a of the spiral portion of the upper die 13 has a draft θ1, the upper die 13 and the scroll 20 are separated from each other only by an initial releasing operation without any resistance.

Further, a robot arm (not shown) enters between the upper mold 13 and the lower mold 3 and grasps the scroll 20,
It moves upward in the axial direction while holding the scroll 20. The mounting seat 7 is raised in synchronization with the movement of the robot arm, and the base of the scroll 20 is pushed out of the lower mold 3 by the push-out pin 5, and the scroll 20 is completely separated from the lower mold 3. Finally, the robot arm moves to the next step from between the upper die 13 and the lower die 3 while holding the scroll 20, and the die-cutting is completed.

The scroll manufactured as described above does not have the surface unevenness due to the traces of a plurality of extrusion pins as in the prior art, and as shown in FIG. Appears as a shape having a flat portion having a uniform height in any cross section. When the extrusion surface 15a and the outer shape of the mold cavity 6 are flush with each other during casting, FIG.
As shown in (1), the spiral tip 20a has a completely flat surface. When the extruded surface 15a of the extruded material is positioned so as to slightly protrude into the cavity 6 of the mold, it appears in a groove shape (FIG. 2B). When it is positioned so as to be slightly immersed in the area 14, it appears convex (FIG. 2C). However, in any case, since the cross section has the same shape at any position and has a flat portion, it does not lead to leakage of the refrigerant gas due to unevenness unlike the conventional case. Further, the draft θ1 is formed on the spiral side surface 20b of the scroll 20 by the draft θ1 applied to the spiral upper surface 13a.

(Effects) The present embodiment has the following effects. (1) According to the casting apparatus, the surface of the surface to be extruded by a plurality of extrusion pins does not occur as in the prior art, and the spiral extruded portion 20a of the scroll as the surface to be extruded has a uniform height due to the integral extruded material 15. Since the shape of the scroll has a flat portion, the scroll tip portion 20a of the scroll requires little or no flat processing, and the number of man-hours can be reduced as compared with the related art. (2) Scroll spiral tip 20 which is the surface to be pushed
It can be used as it is with the cast surface of a left as it is, so-called black scale (excellent in durability and abrasion resistance). (3) For example, for the movable scroll of the present embodiment,
When forming the fixed scroll, the same angle of draft θ1 is also applied to the spiral side surface, so that no gap is formed between the corresponding scroll side surfaces, and no machining of the wall surface is required. Can be used as is. (4) Even if the extruded material 15 is worn and its height is reduced, the extruded material 1 is merely changed from FIG.
5 can be expected to greatly extend the life.

(Embodiment 2) Next, in the movable scroll of Embodiment 1, when the extruded material is obtained by positioning the extruded material so that the extruded surface protrudes into the cavity of the mold, A configuration in which the formed groove is used as a chip seal groove will be described in the present embodiment with reference to FIGS.

During the casting process, the upper mold 13 and the lower mold 3 are closed to form a cavity. At this time, the extruded surface 15a of the extruded material 15 is raised by the depth of a chip seal groove to be described later. The extruded material 15 is positioned so as to project into the mold 13 cavity. In the extruded material 15, the width of the spiral on the extrusion surface 15a is formed to be smaller than the width of the spiral tip 20a of the scroll, which is the surface to be extruded. Groove 2 having a predetermined depth
1 is formed. Further, as shown in FIG. 4, a draft angle θ2 is formed on the side surface 15b of the lower end portion of the extruded material 15, whereby the draft angle θ is formed on the inner wall 21a of the groove portion 21.
2 are formed. Then, a chip seal 26 as a sealing means is fitted into the groove 21 and used as a chip seal groove. At this time, the hermeticity of the contact surface between the chip seal 26 and the groove 21 is improved by the draft angle θ2 applied to the inner wall 21a of the groove.

(Effects) The present embodiment has the following effects. (1) The use of the groove 21 formed in the spiral tip portion 20a by the extruded material 15 protruding into the cavity as a chip seal groove eliminates the need for processing the chip seal groove. (2) Due to the draft angle θ2 applied to the inner wall 21a of the groove, the tip seal can also be shaped along the tip seal to improve the sealing performance of the contact surface of the groove 21, and further increase the sealing performance by enlarging the tip seal tip. Can be improved.

(Modification) The above-described embodiment can be partially modified and implemented as follows. In the first and second embodiments, the dies are arranged vertically, but may be arranged left and right. In the first and second embodiments, the extruding plate 17 descends in synchronization with the rise of the upper die 13 and the extruding plate 7 subsequently rises. May be raised, and then the push-out plate 17 may be lowered. The extruding plate 7 and the extruding plate 17 may be simultaneously moved up and down in synchronization with the rise of the upper die 13. Further, when the dies are arranged vertically, the cast molded product (scroll 20) may be extruded by the extrusion pins 5 so as to be separated from the lower die 3 and then taken out by the robot arm. .

[0037]

According to the first aspect of the present invention, there is provided a casting apparatus for producing a cast molded product which requires little or no flat processing of the surface to be extruded.

According to the second aspect of the present invention, a scroll casting apparatus that requires little or no flattening of the spiral tip, which is the surface to be extruded, is realized.

According to the third aspect of the present invention, a spiral groove having a predetermined width is formed at the tip of the spiral by the extruded material projecting into the cavity of the extrusion surface, and the groove is sealed (including a chip seal). Can be used as

According to the fourth aspect of the present invention, a scroll which can be used with the casting surface left as it is, that is, so-called black scale (excellent in durability and abrasion resistance) is realized.

According to the fifth aspect of the present invention, since the groove formed at the tip of the spiral can be used as a seal (including a chip seal) groove, a scroll which does not require processing of the seal groove is realized.

According to the sixth aspect of the present invention, the scroll can be obtained by the casting device in which the die can be easily removed.

According to the seventh aspect of the present invention, when the movable scroll and the fixed scroll are assembled, a gap is formed between the scroll side faces because the corresponding inclined side faces have the same inclination angle. The sealability can be ensured and can be used as black scale.

According to the eighth aspect of the present invention, the sealing performance by the tip seal can be further improved by the draft provided to the inner wall of the groove.

[Brief description of the drawings]

FIGS. 1A and 1B are schematic views of a casting apparatus according to a first embodiment.

FIGS. 2A, 2B, and 2C are perspective views of main parts in Example 1. FIG.

FIG. 3 is a perspective view of a main part according to a second embodiment.

FIG. 4 is a sectional view of a main part in a second embodiment.

5 (a) and 5 (b) are schematic views of a casting apparatus according to the prior art.

6 (a) and 6 (b) are partial cross-sectional views of an extrusion pin portion in a conventional technique. (C) It is a perspective view of the principal part in a prior art.

FIG. 7 is a perspective view of a main part in a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Mounting seat 2, 12 Stay 3, 13 Die (upper die, lower die) 4, 14 Extruded hole 5 Extruded pin 6 Cavity 7, 17 Extruded plate 15 Extruded material 15a Extruded surface 18, 19 Drive means 20 Casting molding Article (scroll) 20a Spiral tip of scroll which is the surface to be extruded 20b Spiral side surface of scroll 21 Groove 21a Inner wall of groove 25 Casting device.

Continued on the front page (72) Inventor Yasushi Watanabe 2-1-1, Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation (72) Inventor Yoshio Fujita 2-1-1, Toyota-cho, Kariya-shi, Aichi Prefecture Toyota Corporation Inside the Automatic Loom Works (72) Inventor Yoshiharu Yoshida 8 Kyowacho Chaya, Obu City, Aichi Prefecture Toyota Sulzer Co., Ltd. F-term (reference) 3H039 AA01 AA12 BB07 CC02 CC03 CC31 4E093 NA01 NB03 TA10

Claims (8)

[Claims] 1. A pair of casting molds which are arranged so as to be able to be separated from each other and form a cavity, an extrusion hole provided in the mold, an extruded material penetrated through the extrusion hole, and an extruded material comprising: In a casting apparatus comprising an attached extruded plate and driving means for vertically moving the extruded plate, the shape of the extruded surface of the extruded material is continuously substantially the same along the shape of the extruded surface of the cast product. A casting apparatus characterized by being formed in a uniform manner. 2. A scroll type compressor for a scroll type compressor in which a fixed side scroll and a movable side scroll are meshed with each other in respective spirals, and are arranged so as to be joined and separable. A pair of molds forming a cavity, an extrusion hole provided in the mold, an extruded material penetrated through the extrusion hole, an extruded plate to which the extruded material is attached, and vertically moving the extruded plate In the casting apparatus comprising a driving means, the surface to be extruded by the extruded material is a spiral tip of the scroll, and the shape of the extruded surface of the extruded material is continuously substantially the same along the shape of the spiral tip of the scroll. A casting apparatus characterized by being formed in a uniform manner. 3. The casting apparatus according to claim 2, wherein the width of the spiral on the extruded surface is formed smaller than the width of the tip of the spiral on the surface to be extruded, and when pouring the extruded material into the cavity. Wherein the extruded member is positioned so as to protrude therefrom. 4. A casting formed by using the casting apparatus according to claim 1 or 2, wherein the surface to be extruded has a continuous flat portion. 5. A scroll formed by using the casting apparatus according to claim 3, wherein a spiral groove is continuously formed along a spiral tip of the scroll, and a seal member is attached to the groove. Scroll to feature. 6. The casting apparatus according to claim 2, wherein a surface of the cavity corresponding to a side surface of a spiral of a scroll to be formed has a draft angle. 7. A scroll formed by using the casting apparatus according to claim 6, wherein a draft of a side surface of a spiral of a movable scroll is the same as a draft of a corresponding side surface of a spiral of a fixed scroll. A scroll characterized by an inclination angle. 8. The scroll according to claim 5, wherein:
A scroll characterized in that an inner surface of a groove formed at a spiral tip has a draft angle.