JP3183274B2 - Forging method of aluminum alloy rotor material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a raw material such as a rotor of a rotary compressor for air conditioning mounted on an automobile and a rotor of a rotary vacuum pump for brake control.

[0002]

2. Description of the Related Art For the purpose of weight reduction, the rotor of a rotary compressor for air conditioning and the rotor of a rotary vacuum pump for brake control mounted on an automobile are mainly made of aluminum alloy. Normally, the material of the rotor has a shape in which a plurality of grooves (vane storage grooves 2) for accommodating vanes are cut inward from the outer periphery of the cylinder as shown in FIG. Eventually, this material is machined in the center of the material to make a hole for shaft insertion,
Machined for dimensioning and used for rotor manufacturing.

[0003] As a method for manufacturing the rotor material, a method has conventionally been known in which a grooved rod is produced by hot extrusion and then cut into a ring. This method has an advantage that a large number of rotor materials can be efficiently manufactured. However, since the groove position of the rotor is deviated from the center of the shaft, imbalance occurs in the plastic flow of the material on both sides of the groove. In particular, there is a problem that the long extruded rod has a large twist and bend, resulting in poor groove dimensional accuracy of the product. Further, since there is no lubrication between the die and the material, there is a problem that the surface properties of the product are liable to be deteriorated and cracks are generated in the extruded material.

To solve this problem, a hot forging method is known. For example, a hot forging method as disclosed in Japanese Patent Application Laid-Open No. Hei 3-165948 has been proposed. In this case, the above problem is considerably solved because the product is forged one by one, the molding length is short and the die is lubricated each time. Such forging has a structure and a process as shown in FIG.
This is performed using a die such as However, in the forging method in which the lower part of the die 5 is fixed with the anvil 10,
It is difficult for the punch load to be transmitted to the lower end surface of the forged product, especially near the corner where the die blade 7 and the anvil 10 are in contact, and it is difficult to completely fill the die with the material. for that reason,
There is a problem that the groove width of the vane storage groove 2 of the forged product particularly requiring the shape precision is increased near the end face of the product.

[0005] In principle, this problem can be solved by sufficiently increasing the forging load. However, in this case, the load applied to the dies becomes excessive, and the life of the dies that can be mass-produced cannot be obtained. In addition, since the deformation of the die blade portion increases, the dimensional accuracy of the vane storage groove deteriorates. Reducing the forging speed and decreasing the deformation speed is also effective to some extent, but this method is inferior in productivity. Therefore, it is necessary to forge the forged product longer than it should be, and to cut and remove the portion where the groove width is widened, and the cost of the rotor material is increased due to a large increase in the material input amount and the cutting allowance. .

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the problem of widening the width of the vane housing groove near the end face of the forged product when the rotor material is manufactured by hot forging.

[0007]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems. [1] A method for manufacturing an aluminum alloy rotor material having a vane storage groove , comprising: At least al
Pressing punch for pushing minium alloy material,
Dies and forgings end faces to form vane storage grooves
Using a hot forging device with an anvil for forming
There, the side portion corresponding die blade portion on an anvil located under the die blade portion for forming the vane accommodating grooves, to correct the spreading of the groove width of the vane accommodating grooves of the forgings end face
The Rukoto provided a convex portion of the order, suppress the spread of the groove width
Forging method characterized by obtaining, and [2] The method of forging according to [1], wherein the total area of the convex portion is 30% or less of the area of product end face, and [3] the The forging method according to the above [1] or [2], wherein the position of the projection is 4 mm or less from the die blade.
[4] The forging method according to any one of [1] to [3], wherein the height of the projection is 0.3 mm or more and 3 mm or less.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail. FIG. 2 shows a process of manufacturing a rotor material by forging. The aluminum alloy material used as the material is
As shown in FIG. 2A, the sheet is cut into a predetermined length, heated, and put into a case 9 as a blank 13. The inner diameter of the case needs to be equal to or slightly larger than the inner diameter 6 of the die in order to smoothly knock out the material after forging. Next, FIG. 2B shows a state in which the pressure punch has descended from above and has completed a predetermined stroke movement. In this state, the blank 13 is filled in the die 5 and becomes a forged product (rotor material) including a concave portion corresponding to a convex portion protruding into the anvil 10 near the die blade portion on the anvil 10 surface. FIG. 5 shows an example of the convex portion of the anvil corresponding to the concave portion of the end surface of the forged product. Then, as shown in FIG. 2c, the knockout pin comes out from below and discharges the forged product.

By the way, regarding the above-mentioned convex portion of the anvil,
The following aspects are desirable. First, when the area of the convex portion is too large as compared with that of the end face of the product, the load for forming the convex portion is increased, and this has an adverse effect on the die life and the accuracy of the vane housing groove. For this reason, the total area of the protrusions is 30% or less, preferably 20% or less of that of the product end face.

Second, regarding the position of the convex portion, if the distance between the convex portion and the die blade portion is too large, the effect of bringing the material is not sufficiently reached to the vane storage groove. Therefore, the position of the projection must be 4 mm or less from the die blade, and preferably 3 mm or less from the die blade. Further, depending on the shape and height of the projections, even if the distance from the die blade is too small, the material may not easily protrude at the distance, and a good effect may not be obtained. In order to avoid such a problem, it is desirable to provide a distance of 0.7 mm or more between the convex portion and the die blade portion. There is no particular limitation on the distance between the protrusion and the inner diameter 6 of the die (outer diameter of the forged product), and they may be in contact with or separated from each other.

Third, with respect to the height of the convex portion, as the height increases, the cutting allowance of the end face of the product increases, and the material tends to hardly protrude between the convex portion and the die blade portion. On the other hand, if the height of the projection is too low, a sufficient effect cannot be obtained. From such a viewpoint, the height of the convex portion is 0.3 mm or more and 3 mm or less, preferably 0.5 mm or more and 2 mm or less.

The shape of the projection is not particularly limited. Circular, triangular, rectangular (rod-shaped), horseshoe-shaped or U-shaped encircling die blades, and three-dimensionally inclined or grooved for the purpose of adjusting the material flow can also be provided. Also, the protrusions need not be provided on both sides of the vane storage groove, but may be provided only on one side. Also, the projections need not be the same shape and target position on both sides of the vane storage groove. Further, the projection does not need to be formed directly on the anvil, and for example, as shown in FIG. 3, a plate 16 having a projection may be inserted into the bottom of the die or the upper surface of the anvil.

[0013]

According to the present invention, when a rotor material is manufactured by a forging method, it is difficult for the material to fill the portion surrounded by the die blades and the anvil on the end surface of the forged product even after the press punch has completed a predetermined stroke. Further, the phenomenon in which the width of the vane storage groove of the forged product is widened near the end face is prevented by forming a convex portion on the anvil and filling the die blade portion with the material so that the material can flow easily.

[0014]

The present invention will be described in more detail with reference to the following examples. Example 1 A die having a shape as shown in FIG.
2.5 mm, several blades 7, distance d (displacement amount) between the blade center and the shaft center 4.8 mm, blade length 1 is 18 mm, blade width t is 3.2 mm, and blade height h is 51 mm , And forged. As a material, an aluminum alloy having an A390 composition was used as a blank, and a material having a size of φ61.3 mm was used. An anvil having a columnar projection as shown in FIG. 5 was used. The forging conditions are a blank temperature of 300 to 460 ° C., a die and pressure punch temperature of 100 to 350 ° C., and a load of 20 to 100 t. Example 2 The same dies and materials as in Example 1 were used, and
Example 1 using a rod-shaped protrusion as shown in FIG.
Forging was performed under the same forging conditions as described above. Comparative Example 1 The same die and material as in Example 1 were used, and a flat anvil-free one was used and forging was performed under the same forging conditions. As shown in FIG. 8A, the width B of the vane housing groove at the end face of each of these forged products and the parallel portion A above it are measured, and B-A is set as the width of the groove width. The measurement was performed at three positions of such a groove. Table 1 summarizes the results. FIG. 7 shows a sketch of the end face of the forged product of the first embodiment. As a result, when the conventional anvil as shown in Comparative Example 1 is used, the groove width is widened over the entire rotor, but this is not seen in the forged product according to the present invention.

[0015]

[Table 1]

[0016]

According to the present invention, when manufacturing a rotor material by a forging method, it is possible to prevent the width of the vane housing groove from expanding beyond a predetermined dimension at the end surface of the forged product.

[0017]

[Brief description of the drawings]

FIG. 1 is a diagram showing a rotor material shape by forging prior to the present invention, wherein (a) is a plan view and (b) is BOB of (a).
It is a figure showing a section.

FIGS. 2A and 2B are views showing a forging process according to the present invention, wherein FIG. 2A is an explanatory view of blank injection and before forging, FIG. 2B is a view immediately after forging, and FIG.

3A and 3B are diagrams illustrating an example in which a protruding plate is placed on an anvil in forging a rotor material according to the present invention, and FIG. 3B is a diagram illustrating an example in which a protruding plate is embedded in an anvil. is there.

4A and 4B are diagrams showing an example of a die shape used for forging according to the present invention, wherein FIG. 4A is a plan view of the die, and FIG.
FIG. 2C is a cross-sectional view taken along line OX, and FIG.

FIG. 5 is an example of a convex shape diagram of an anvil according to the present invention, in which the convexities are cylindrical. (A) is a plan view, (b) is a diagram showing a cross section of a convex portion.

FIG. 6 shows another example of a convex shape of an anvil according to the present invention, in which a convex portion is provided in a bar shape along a vane housing groove.
(A) is a plan view of a die, and (b) shows a cross section of a convex portion.

FIG. 7 is a sketch of an end face of a forged product according to the present invention.

FIG. 8 is a diagram showing a method of measuring the width of a vane storage groove of a forged product,
(A) is a side view illustrating the spread of the groove width at the groove end face,
(B) is a top view showing three positions of width measurement.

[0018]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor material 2 Vane storage groove 5 Dice 7 Dice blade part 9 Case (container) 10 Anvil (die plate) 11 Knockout pin 12 Pressure punch 13 Blank 16 Plate with protrusion

Continuation of the front page (72) Inventor Yoshiyuki Anazawa 7840 Uchicho, Kitakata-shi, Fukushima Shouchi Co., Ltd. (56) References JP-A-11-230068 (JP, A) JP-A-60-2291 (JP, A) JP-A-4-272491 (JP, A) JP-A-4-361846 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21J 5/02 B21J 13/02 B21K 3 / 04

Claims (4)

(57) [Claims] 1. A method for manufacturing an aluminum alloy rotor material having a vane storage groove , comprising:
Pressing punch, also for pushing aluminum alloy material
Dies and forging to form perimeter and vane storage grooves
Hot forging device with an anvil for forming a product end surface
The width of the groove width of the vane storage groove on the end face of the forged product is corrected at the part corresponding to the die blade part on the anvil located at the lower part of the die blade part forming the vane storage groove using
The convex portion provided Rukoto for, the spread of the groove width
A forging method characterized by suppressing . 2. The total area of the projections is 3 times the area of the end face of the product.
The forging method according to claim 1, wherein the forging method is 0% or less. 3. The position of the projection is 4 m from the die blade.
The forging method according to claim 1 or 2, wherein m is equal to or less than m. 4. The height of the projection is not less than 0.3 mm and not more than 3 mm.
The forging method according to claim 1, wherein: