JPH0723077Y2 - Forging die for aluminum alloy scroll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a forging die for an aluminum alloy scroll used as a compressor part.

[Conventional technology]

As is well known, scrolls made of aluminum alloy are widely used as compressor parts such as automobiles and home coolers. By the way, forged scrolls were used in the initial stage, but recently, forged scrolls are gradually being replaced by forged scrolls because of their excellent reliability.

A forging die for forging such a scroll is, as shown in FIG. 5 of the configuration explanatory view (showing the state during forging),
An upper die (21) having a shaft forging chamber (21a) for forging the shaft portion, and a scroll flange portion and a spiral spiral portion which are arranged below the upper die (21) and are forged. It consists of a lower die (22) having a flange / rib forging chamber (22a) to be molded, and a burr chamber (24) into which the burrs generated when a scroll is manufactured by forging a material into the outer periphery of the forging chamber enters. It is configured to have.

[Problems to be solved by the device]

However, the forged scroll has the following problems related to forging to be solved.

In other words, considering the shape of the forged scroll, by making the involute spiral part side of the scroll down,
Although the forging scroll is left on the lower die side when the upper die is lifted after the forging is finished to make it easier to take it out, the involute spiral part side, which is an important part, faces downward. In order to remove the forged scroll from the lower die, it is impossible to provide a knockout mechanism as a pressing body that pushes up the forged scroll.

Therefore, improvement in forging workability, that is, improvement in productivity of forged scrolls due to mechanization and automation cannot be expected.

The material used for forging the scroll is an Al-Si alloy, which is inferior in forgeability (fluidity) among aluminum alloys.

In this way, the reason why the material with poor forgeability must be used as the material for scrolls is that it has the best wear resistance among Al alloys and has high strength (high fatigue strength) (generally,
It is said that a tensile strength of 36 kg / mm ² is required).

Therefore, since the forgeability of the material is inferior, the forging die has a large draft of about 5 ° (usually about 3 °) and
For example, the thickness of the tip of the involute vortex part of the external system φ100 mm scroll must be 6 mm, and the height of the involute vortex part is high, so the amount of burrs that stick out is extremely large, so the yield decreases It has become a factor of increasing the material cost.

Therefore, an object of the present invention is to provide a forging die for an aluminum alloy scroll that can improve the workability of forging and the yield of raw materials.

[Means for Solving the Problems]

The present invention has been made to solve the above-mentioned problems. Therefore, the structure of the forging die for an aluminum alloy scroll according to the first aspect of the present invention is the same as that of an upper die that can be lifted and lowered. A forging die for an aluminum alloy scroll comprising a fixed lower die, a rib forging chamber for forming a spiral spiral portion in the upper die, and a shaft forging chamber for forming a shaft portion in the lower die. An inner die having a groove is formed in the inner wall, and a flange portion forging chamber for forming a flange portion with the upper surface of the inner die is provided, and a lower surface of the inner die is provided in a through hole provided in the lower portion. It is characterized in that a pressing body for pressing is inserted so as to be able to move up and down.

The forging die for an aluminum alloy scroll according to the second aspect of the present invention has the same structure as the forging die for an aluminum alloy scroll according to the first aspect of the present invention, in which the upper die and the lower die are provided near each other. When the surfaces to be contacted are in close contact, the distance between the surfaces in contact with each other and the forging chamber is 0.2 mm or less.

[Action]

According to the forging die for an aluminum alloy scroll according to the first aspect of the present invention, the outer periphery of the flange portion of the forged scroll is formed with a headband-shaped surplus portion that fits in the groove. When the die is raised, the forged scroll remains on the lower die side and only the upper die rises.Next, when the pressing body is raised and the lower surface of the inner die is pushed up, the surplus part is sheared and the forged scroll becomes Remove from the lower mold.

On the other hand, according to the forging die for an aluminum alloy scroll according to the second aspect of the present invention, in addition to the function of the first aspect, the distance between the facing surfaces between the close contact surface and the forging chamber is 0.2 mm or less. Since it is set so that the amount of protrusion of burr is reduced.

〔Example〕

An embodiment of the present invention is shown in FIG.
The description will be given below with reference to FIG. 2 of the enlarged view of the II part of FIG. 1 and FIGS. 3 and 4 of the configuration explanatory view of the forged scroll.

First, as shown in FIGS. 3 and 4, the scroll (10) includes a spiral spiral portion (11), a substantially disc-shaped flange portion (12) supporting one end face side thereof, and A shaft part (1) having a center line that matches the center line in the radial direction of the surface of the flange part (12) opposite to the spiral spiral part (11).
It has a well-known structure consisting of 3) and.

To forge the scroll (10), which is a forged product having the above-mentioned configuration, a forging die including the following die having an upper die and a lower die was used.

As for the details of the forging die, as shown in FIG. 1, reference numeral (1) indicates a spiral spiral part (11) of a scroll (10).
Is an upper die having a rib portion forging chamber (1a) for forging and forming a scroll shaft (1) below the upper die (1).
A shaft forging chamber (3a) for forging and forming 3) is provided, and an inner die (3) that moves up and down by pressing the lower portion of the shaft forging chamber with a knockout rod (5) is internally provided.

Further, the inner die (3) upper surface and the scroll (1
The lower die (2) is arranged to define a flange portion forging chamber (2a) for forging the flange portion (12) of (0).

On the other hand, a protrusion (1b) is provided near the outer periphery of the upper die (1), and the protrusion (1b) is provided near the outer periphery of the lower die (2).
A depth of 0.2 mm is deeper than the height of b), and a spigot part (2b) is provided to which the protrusion (1b) of the upper mold (1) is detachably fitted.

That is, when the scroll (10) is forged, when the forging chamber sides of the two dies (1) and (2) are pressed against each other, the scroll (10) having the above configuration is forged, but The outer surface of the protrusion (1b) of the die (1) and the outer surface of the spigot portion (2b) of the lower die (2) are in contact with each other, so that burrs generated during forging enter the burr chamber. (4) is defined between the tip end surface of the protrusion (1b) and the bottom surface of the spigot portion (2b).

Furthermore, in the flange part forging chamber (2a) of the lower die (2), on the inner wall forming the end surface of the flange part (12),
As shown in FIG. 2, a groove (2c) having a depth of 0.2 to 0.5 mm and a width of 2 to 5 mm is provided around.

By this groove (2c), a headband-shaped extra thickness portion having a shape corresponding to this groove (2c) is formed on the outer periphery of the flange portion (12). Therefore, the upper die (1) is raised when the scroll as a product after forging is taken out, but when the upper die (1) is raised, the forged scroll cannot be removed from the upper die (1). It is prevented from rising together with the upper mold (1). Next, when the knock-out rod (5) is pushed up after the upper die (1) is moved up and down, the push-up force shears the headband-shaped surplus portion formed by the groove (2c), The forged scroll will come off from the lower die (2).

By the way, the shape of the extra thickness portion does not need to be a headband shape. That is, it is sufficient that the upper die (1) is not sheared when the upper die (1) is lifted up, and therefore there is no problem even if the protrusions are formed at predetermined intervals. In other words, it has been confirmed that the groove (2c) and the knockout rod (5) enable mechanization of the upper die (1) and take-out of the forged scroll, thereby significantly improving the forging work efficiency.

That is, using the forging die having the above configuration,
The scroll (10) having the configuration shown in the figure was forged. For example, it was 1.5 minutes / piece in the past, but this was 1.0 minutes / piece, and the forging time was shortened to 30 seconds per scroll.

In addition, the burr chamber (4) has a thickness of 2 mm.
Due to the following reasons, burrs were hardly generated and the yield was improved by 30%.

By the way, the total weight of the forged scroll, which is the primary product including the weight of burr before machining, was 2.0 kg on average, while the average was 2.6 kg in the past, which means that the weight was significantly reduced. Well understood In this case, the volume of the raw material is extremely important, but a preferable raw material volume without excess or deficiency can be set by several forging tests.

In addition, since the amount of flash that protrudes is extremely small as described above, in addition to reducing the power required for reducing the power of the press used for forging, it also contributes greatly to reducing the repair cost associated with the operation of the press. Other economic effects have also been derived.

[Effect of device]

As described above in detail, according to the first aspect of the present invention, the outer periphery of the flange portion of the forged scroll is formed with a headband-shaped surplus portion that fits in the groove, and the upper die is raised. When only the upper die is raised, and then the pressing body is raised to push up the lower surface of the inner die, the excess thickness portion is sheared, so that the forging process can be mechanized, resulting in an improvement in productivity.

On the other hand, according to the first aspect of the present invention, in addition to the effect of the first aspect, the distance between the mating surfaces of the two dies on the outside of the forging chamber of the product dies is 0.2 mm or less. Unlike the forging dies, the amount of burrs is not so large that the material yield can be improved.

Therefore, according to the first invention and the second invention, it is possible to expect an extremely great effect on the improvement of the forging workability and the improvement of the material yield.

[Brief description of drawings]

1 to 4 relate to an embodiment of the present invention, FIG. 1 is an explanatory view of a sectional structure of a forging die according to the embodiment, FIG. 2 is an enlarged view of a II portion of FIG. 1, FIG. FIG. 4 is a structural explanatory view of a forged scroll, and FIG. 5 is a structural explanatory view of a conventional forging die. (1) …… Upper die, (1a) …… Rib part forging chamber, (1b)…
… Projection of upper die, (2) …… Lower die, (2a) …… Flange forging chamber, (2b)… Inlay of lower die, (2c)…
… Groove, (3) …… Inner die, (3a) …… Shaft forging chamber,
(4) …… Burr room, (5) …… Knockout rod,
(10) …… Scroll, (11) …… Spiral spiral part, (12) …… Flange part, (13) …… Shaft part.

Claims (2)

[Scope of utility model registration request] 1. A forging die for an aluminum alloy scroll, which comprises an upper die that is vertically movable and a lower die that is fixed, and a rib forging chamber for forming a spiral spiral portion in the upper die. Provided is an inner die having a shaft forging chamber for forming a shaft in the lower die, and a groove is provided on the inner wall, and a flange forging chamber for forming a flange with the upper surface of the inner die is provided. A forging die for an aluminum alloy scroll, characterized in that a pressing body for pushing the lower surface of the inner die is inserted through a through hole provided in the lower portion so as to be able to move up and down. 2. When the upper die and the lower die have opposed surfaces in the vicinity of their outer periphery in close contact with each other, the distance between the contact surfaces and the forging chamber is 0.2 mm or less. A forged die for an aluminum alloy scroll according to claim 1, wherein the utility model is registered.