A forging method for Y-shaped open-die forgings

Abstract

The present invention provides a forging method for Y-shaped free forgings, which includes manufacturing a forging blank, machining a milling groove, and pressing to form a Y shape. In this method, the lower anvil of the die set is used as the forming die. The forged blank after milling the groove is placed upside down on the lower anvil of the die set, and the opening of the milling groove of the forged blank is aligned with the center of the arc of the lower anvil part. The upper anvil drives the forged blank to move downward to apply pressure until the root of the milling groove contacts the top arc of the lower anvil part; strike the top arc of the lower anvil part to ensure that the forged blank fits closely with the lower anvil part without gaps. Finally, the bifurcated part of the forged blank is bifurcated into a Y-shaped free forging with a corresponding opening angle along the shape of the lower anvil part of the lower anvil of the die set. This method is simple, easy to implement, and practical, and can solve the problems of serious waste of blank raw materials and excessively high machining costs, saving about 60% of the forging and machining costs of the product in general.

Description

Technical Field

[0001] The present invention belongs to the technical field of forging processing, and particularly relates to a forging method for Y-shaped open-die forgings. Background Art

[0002] In the forging industry, the usual manufacturing method of Y-shaped open-die forgings (with a structure as Figure 1 shown) is to first forge a square plate and then perform machining. However, this method not only causes serious waste of forging blank raw materials, but also results in too high machining costs. Summary of the Invention

[0003] (I) Technical Problems to be Solved

[0004] The present invention provides a forging method for Y-shaped open-die forgings to solve the technical problems of serious waste of forging blank raw materials and too high machining costs.

[0005] (II) Technical Solutions

[0006] To solve the above technical problems, the present invention provides a forging method for Y-shaped open-die forgings, which includes the following steps:

[0007] S1. Manufacturing a forging blank: The main body of the forging blank is a flat plate structure, and a protruding portion is formed on the front surface of the flat plate structure. The width of the forging blank is the same as the bottom width of the non-bifurcated part of the Y-shaped open-die forging;

[0008] S2. Machining and milling a groove: Machining and milling a groove from the top of the forging blank downwards, and milling the upper half part above the protruding portion of the forging blank into left and right two parts for the bifurcated part of the Y-shaped open-die forging. The length of the lower half part of the forging blank without the milled groove is the same as the height of the non-bifurcated part at the bottom of the Y-shaped open-die forging;

[0009] S3. Pressing into a Y shape: Using a die bottom anvil as a forming die, the die bottom anvil includes a flat plate support portion at the bottom and a lower anvil portion with a triangular cross-section arranged on the upper surface of the flat plate support portion. The top end of the lower anvil portion is set in an arc shape; placing the forging blank after milling the groove upside down on the die bottom anvil, aligning the milled groove opening of the forging blank with the arc center of the lower anvil portion, and driving the forging blank downward by the upper anvil to apply pressure until the root of the milled groove contacts the top arc of the lower anvil portion; hitting the top arc of the lower anvil portion to ensure that the forging blank fits with the lower anvil portion without leaving a gap, and finally bifurcating the bifurcated part of the forging blank into a Y-shaped open-die forging with a corresponding opening angle along the shape of the lower anvil portion of the die bottom anvil.

[0010] Further, in step S3, the top angle of the lower anvil portion is reduced by 5% compared with the Y-shaped opening angle of the Y-shaped open-die forging.

[0011] Further, in step S3, the height of the lower anvil part is greater than 10% of the height of the bifurcated part of the Y-shaped open-die forging.

[0012] (III) Beneficial effects

[0013] The present invention provides a forging method for a Y-shaped open-die forging, including manufacturing a forging blank, machining a milling groove, and pressing to form a Y shape. This method uses a die lower anvil as a forming die, places the machined forging blank upside down on the die lower anvil, aligns the milling groove opening of the forging blank with the arc center of the lower anvil part, drives the forging blank downward by the upper anvil to apply pressure until the root of the milling groove contacts the top arc of the lower anvil part; impacts the top arc of the lower anvil part to ensure that the forging blank fits tightly with the lower anvil part without gaps, and finally bifurcates the bifurcated part of the forging blank into a Y-shaped open-die forging with a corresponding opening angle along the shape of the lower anvil part of the die lower anvil. This method is simple, easy to implement, and practical, can solve the problems of serious waste of blank raw materials and too high machining costs, and comprehensively saves about 60% of the forging and machining costs of the product. Description of the drawings

[0014] Figure 1 is a schematic structural diagram of a Y-shaped open-die forging;

[0015] Figure 2a is the front view of the forging blank of the embodiment of the present invention, Figure 2b is the side view;

[0016] Figure 3 is the front view of the forging blank after machining the milling groove in the embodiment of the present invention;

[0017] Figure 4 is the schematic structural diagram of the die lower anvil in the embodiment of the present invention;

[0018] Figure 5a is the front view of the Y-shaped open-die forging of the embodiment of the present invention, Figure 5b is the side view. Specific embodiments

[0019] To make the purpose, content, and advantages of the present invention clearer, the following further describes the specific embodiments of the present invention in detail with reference to the drawings and embodiments.

[0020] This embodiment provides a forging method for a Y-shaped open-die forging, which specifically includes the following steps:

[0021] S1. Manufacturing a forging blank: As shown in Figure 2a and 2b , the main body of the forging blank is a flat plate structure, a convex part is formed on the front surface of the flat plate structure, and the width of the forging blank is the same as the bottom width of the non-bifurcated part of the Y-shaped open-die forging.

[0022] S2. Machining and milling grooves: Starting from the top of the forging blank, machine-mill grooves downward, milling the upper half of the forging blank above the raised part into two parts on the left and right, as Figure 3 shown, for the bifurcated part of the Y-shaped free forging. The length of the lower half of the forging blank without milled grooves is the same as the height of the non-bifurcated part at the bottom of the Y-shaped free forging.

[0023] S3. Pressing Y-shaped forming: Use the die lower anvil as the forming die, as Figure 4 shown. The die lower anvil includes a flat plate support part at the bottom and a lower anvil part with a triangular cross-section arranged on the upper surface of the flat plate support part. The top of the lower anvil part is set in an arc shape, and the top angle is reduced by 5% compared to the Y-shaped opening angle of the Y-shaped free forging. If it is less than 5%, the angle of the final forging blank will be less than the design requirement, resulting in scrapping. If it is greater than 5%, the angle of the forging blank will also be greater than the design requirement, resulting in scrapping. The height of the lower anvil part is greater than 10% of the height of the bifurcated part of the Y-shaped free forging. If it is greater than 10%, it will cause waste of materials. If it is less than 10%, black skin defects will occur during the machining of the two bifurcated endpoints of the Y-shaped free forging.

[0024] Place the forging blank after milling grooves upside down on the die lower anvil, align the milled groove opening of the forging blank with the arc center of the lower anvil part, and the upper anvil drives the forging blank to move downward to apply pressure until the root of the milled groove contacts the top arc of the lower anvil part; Use a crane ram to strike the top arc of the lower anvil part to ensure that the forging blank fits tightly with the lower anvil part without gaps. Finally, the bifurcated part of the forging blank follows the shape of the lower anvil part of the die lower anvil and bifurcates into a Y-shaped free forging with a corresponding opening angle, as Figure 5a and 5b shown.

[0025] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A forging method for Y-shaped free forging parts, characterized in that, The forging method includes the following steps: S1. Manufacturing a forging blank: The main body of the forging blank is a flat plate structure, and a convex portion is formed on the front surface of the flat plate structure. The width of the forging blank is the same as the bottom width of the unforked part of the Y-shaped open-die forging. S2. Machining a milling groove: Machining a milling groove downward from the top of the forging blank, milling the upper half of the forging blank above the convex portion into left and right parts for the forked part of the Y-shaped open-die forging. The length of the lower half of the forging blank without the milling groove is the same as the height of the unforked part at the bottom of the Y-shaped open-die forging. S3. Pressing to form a Y shape: Using a die bottom anvil as the forming die, the die bottom anvil includes a flat plate support portion at the bottom and a lower anvil portion with a triangular cross-section arranged on the upper surface of the flat plate support portion. The top end of the lower anvil portion is set in an arc shape. Place the forging blank after milling the groove upside down on the die bottom anvil, align the milling groove opening of the forging blank with the arc center of the lower anvil portion, and drive the upper anvil to press the forging blank downward until the root of the milling groove contacts the top arc of the lower anvil portion. Impact the top arc of the lower anvil portion to ensure that the forging blank fits closely with the lower anvil portion without gaps. Finally, the forked part of the forging blank is forked into a Y-shaped open-die forging with a corresponding opening angle following the shape of the lower anvil portion of the die bottom anvil.

2. As described in claim 1, characterized in that, In step S3, the top angle of the lower anvil portion is reduced by 5% compared to the Y-shaped opening angle of the Y-shaped open-die forging.

3. As described in claim 1, characterized in that In step S3, the height of the lower anvil portion is greater than 10% of the height of the forked part of the Y-shaped open-die forging.

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