JPH0639471A - Manufacture of melting material forging part - Google Patents

Abstract

PURPOSE:To manufacture a sound melting material forging part without defect with an extra low forging pressure by processing with forging a forging stock with upper and lower punches, and forming a projecting part while applying a back pressure on the forging stock with an insert die. CONSTITUTION:An Al alloy melting material of the prescribed dimension as a forging stock is prepared, one hand, a forging die is composed of a die 2 having a cavity surface 2a corresponding to a plane shape of the forging stock 1, and in respectively corresponding to a shaft part and a blade part of a scroll part of a final forging part, an upper punch 3 with a structure that a cavity part 3d of a cavity surface 3c is made to a bar like insert die 3b freely movable up and down by making a central piercing hole 3a as a guide and a lower punch 4 with a structure that a cavity part 4d of a cavity surface 4c is similarly made to a vortex like insert die 4b freely movable up and down by making a vortex like through hole as the guide. After heating the forging stock 1, the forging forming the projecting part is executed while applying the back pressure on the forging stock 1 in the prescribed forging condition with the insert die 3b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a melted material forged part which can be forged at a low pressure when various structural parts having convex portions of a predetermined shape on the upper surface and / or the lower surface are manufactured by forging. It is about.

[0002]

2. Description of the Related Art Conventionally, various structural parts such as an Al alloy scroll for a compressor and an Fe alloy gear for a pump have been used as a forging material on the top surface and / or Alternatively, using a molten material that has a plane shape that is equivalent to or approximate to the plane shape of the final forged part that has convex parts of a predetermined shape on the lower surface and that does not change in thickness, preform forging material as necessary. Forging with a cavity surface formed corresponding to the shape of the final forged part, that is, a concave surface corresponding to the convex part of the final forged part is formed on the upper punch and / or the lower punch in the processed state. It is well known that it is manufactured by placing it in a mold and subjecting it to a forging process using upper and lower punches.

[0003]

However, by using the above-described conventional method for manufacturing a forged melted material, for example, an Al alloy having a high Si content and a thin wing portion as shown in a schematic perspective view in FIG. When manufacturing scroll parts, a high forging pressure of about 7 to 10 ton / cm ² is usually required.
As a result, not only a relatively large forging device is required, but also the high forging pressure is a cause of shortening the life of the die.

[0004]

Therefore, the present inventors have
From the above viewpoints, as a result of research to manufacture sound molten metal forged parts with low forging pressure and with good yield, as a result of the forging process for structural parts having convex parts of a predetermined shape on the upper surface and / or the lower surface. When manufacturing, the cavity part of the convex part formation part can be moved up and down, and the upper and lower punches have a nested structure with added back pressure, and the convex part is formed while applying back pressure by the nest to the forging material. We obtained the research result that forging under low pressure becomes possible when forming forging is performed.

The present invention was made on the basis of the above-mentioned research results.
Or prepare a melting material having a plane shape equivalent to or approximating the plane shape of the final forged part having a convex portion of a predetermined shape on the lower surface and having no change in thickness, and transform the forging material into the plane shape thereof. Forging consisting of a die body with corresponding cavity surface and cavity part corresponding to the convex part of the final forged part that can be moved up and down to form a nested structure with back pressure The molten material is forged into a mold, and then the forging material is subjected to forging processing by the upper and lower punches, and a convex portion is formed while applying back pressure to the forging material by the nesting. The method has a feature.

[0006]

EXAMPLES Next, the method of the present invention will be specifically described by way of examples. Example 1 As a forging material, in weight%, Si: 10%, Cu: 3
%, Mg: 0.5%, Mn: 0.5%, Sb: 0.15
%, With the balance consisting of Al and unavoidable impurities, and preparing an Al alloy melting material having dimensions of diameter: 77 mm x thickness: 19 mm, while the forging die is schematically shown in FIG. As shown in the longitudinal sectional view, a mold body 2 having a cavity surface 2a corresponding to the plane shape of the forging material 1, and FIG.
The cavity portion 3 of the cavity surface 3c corresponding to the convex portion of the scroll component S which is the final forged component shown in the schematic perspective view, that is, the shaft portion S ₂ and the blade portion S ₃ , respectively.
The upper punch 3 has a bar-shaped insert 3b which is vertically movable by using the central through hole 3a as a guide, and the cavity portion 4d of the cavity surface 4c which is vertically movable by using the spiral through hole 4a as a guide. The lower punch 4 having the structure of the shape nest 4b is formed, and then the forging material 1 is
After being loaded into the forging die as shown in FIG. 1 in a state of being heated to 0 ° C., as shown in the same schematic longitudinal sectional view in FIG. 2, the applied pressure of the upper punch is from 4 ton / cm ² to 0. 5ton / cm
Incremented by ² to 10 tons / cm ² , 13 ways, back pressure of rod insert of upper punch: 0.5 tons / cm ² , additional pressure of lower punch: O, back pressure of spiral insert of lower punch: 0. The method of the present invention is carried out by forging the forging material 1 under the conditions of 5 ton / cm ² while forming a convex portion, that is, the shaft portion S ₂ and the blade portion S ₃ while applying back pressure by the nesting. ,
It has the shape shown in FIG. 3 and has a main body S ₁ ; outer diameter: 79 mm ×
Thickness: 11 mm, shaft S ₂ ; Outer diameter: 20 mm x Height: 28 m
m, and blade part S ₃ ; outermost diameter: 31 mm × wall thickness: 5 mm ×
Height: A scroll part S having a size of 16 mm as a final forged part was manufactured.

For the purpose of comparison, as shown in a schematic longitudinal sectional view in FIG. 4, a mold body 2'having a cavity surface 2'a, which corresponds to the shape of the scroll component, and a cavity surface 2 ' In a forging die composed of an upper punch 3'and a lower punch 4'having a 3'c and a cavity surface 4'c, the same forging material 1 as the Al alloy melted material was heated at 450 ° C. As shown in the schematic longitudinal sectional view of FIG. 5, the pressure applied to the upper punch 3'was increased to 13 tones from 4 ton / cm ² to 0.5 ton / cm ² to 10 ton / cm ^2. The conventional method was carried out by carrying out the forging process in 1. to produce the scroll component S ′ having the same dimensions as those produced by the method of the present invention.

Next, the relationship between the scroll component obtained as a result and the applied pressure of the upper punch was examined. According to the method of the present invention, a healthy component free from defects is produced at a pressure of 4.5 ton / cm ^2. In contrast, the conventional method cannot produce sound parts unless a pressure of 9.5 ton / cm ² is applied.

Example 2 In% by weight, C: 0.17%, Si: 0.25%, Mn:
Fe containing 0.82%, Cr: 1.1%, Mo: 0.22%, the balance being Al and unavoidable impurities, and having a dimension of diameter: 98 mm x thickness: 25 mm. An alloy melting material is prepared as a forging material, and this Fe alloy melting material is used for a die main body having a cavity surface corresponding to the plane shape of the main body G ₁ of the pump gear part G having the shape shown in the schematic perspective view of FIG. An upper punch having a nested structure in which a cavity portion corresponding to the tooth portion G ₂ (convex portion) of the gear component is vertically movable to receive back pressure, and a cavity surface corresponding to the lower surface shape of the gear component. It is charged in a forging die consisting of a lower punch having the same at a temperature of 950 ° C., and the pressure applied to the upper punch is the same as in Example 1, the back pressure of the upper punch nest is 1 ton / cm ² , and the lower punch is Applied pressure: Nested in the above forged material under the condition of O 2. That while applying back pressure to implement the present invention method for performing forging for forming the tooth portion G ₂ (convex portion), the body outer diameter: 100 mm × teeth height: 15 mm
× Tooth center width: A gear part for a pump having a dimension of 10 mm was manufactured.

As a result, in the method of the present invention, satisfactory parts without defects could be produced under the condition that the pressure applied to the upper punch was 4.5 ton / cm ² , whereas in the conventional method, 9 to
pressure of n / cm ² was required.

[0011]

From the results shown in Examples 1 and 2 above,
According to the method of the present invention, it is clear that a defect-free and sound molten material forged part can be manufactured with an extremely low forging pressure, and therefore, the forging device can be downsized and the service life of the die can be extended. This makes it possible to produce a melted material forged part at a low cost in combination with the improvement of the yield, which brings industrially useful effects.

[Brief description of drawings]

1 and

FIG. 2 is a schematic vertical sectional view showing an embodiment of the method of the present invention.

FIG. 3 is a schematic perspective view of a scroll component.

FIG. 4 and

FIG. 5 is a schematic vertical sectional view for explaining a conventional method.

FIG. 6 is a schematic perspective view of a gear part.

[Explanation of symbols]

 1 Forging material 2 Die body 3 Upper punch 3b Vertically movable rod-shaped nest 4 Lower punch 4b Vertically movable spiral nest 5 Scroll parts

Claims (1)

[Claims] 1. As a forging material, a melting material having a plane shape which is equivalent to or close to the plane shape of a final forged part having convex portions of a predetermined shape on the upper surface and / or the lower surface and whose thickness does not change is prepared. Then, with the forging material, a die body having a cavity surface corresponding to the plane shape of the forging material, and a cavity portion corresponding to the convex portion of the final forged component can be moved up and down, and a nesting structure with a back pressure applied. Was placed in a forging die composed of an upper punch and a lower punch, and then the forging material was subjected to forging processing by the upper and lower punches, and the convex portion was applied while applying back pressure by the nesting to the forging material. Forming a melted material forging part.