Forging method of marine rocker arm swage

Abstract

A forging method of a marine rocker arm die forging piece, comprising an upper die block, a rocker arm die forging piece, a lower die block, a flash, a bridge and a fold. The rocker arm die forging piece is placed on the lower die block, the upper die block moves downward to form a blow, and the rocker arm die forging piece forms a flash through the bridge in the forming process. The invention determines the possibility of the rocker arm die forging piece folding by controlling the closing distance H of the upper die block and the lower die block, the deformation state formed on the upper surface of the rocker arm die forging piece, and provides intuitive basis for the determination and optimization of the pre-forging size and shape of the rocker arm die forging piece, filling the blank of the die forging simulation for the determination of the surface shallow crack of the die forging piece.

Description

Technical Field

[0001] This invention relates to the optimization of the process for marine rocker arm forging, and in particular to a forging method for marine rocker arm forging. Background Technology

[0002] Currently, improvements to surface folding in domestic die forgings primarily focus on the folded state formed on the surface at the end of the final forging process. These improvements aim to eliminate surface folds by optimizing pre-forging dimensions and shapes, or through direct die forging simulation design. However, these methods often deviate significantly from reality, requiring multiple adjustments to the die dimensions and shape. This results in long die design and manufacturing cycles and high costs. In actual die forging production, folds form within the last 8-15mm of the final forging die closing process, caused by disordered metal filling of the die cavity.

[0003] Current forging simulation software determines the optimal die-closing parameters for surface folding of forgings by comparing the state of metal filling the die cavity before final forging and the surface folding after final forging. Existing forging simulation designs often improve and optimize the pre-forging dimensions and shape based on the folding state formed on the surface after final forging, which deviates significantly from reality, requires multiple adjustments to input conditions, and results in a long design cycle. Summary of the Invention

[0004] The purpose of this invention is to provide a forging method for marine rocker arm forgings, which provides an intuitive basis for determining and optimizing the pre-forging dimensions and shape of rocker arm forgings, and fills the gap in the determination of shallow surface cracks in forgings through forging simulation.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A forging method for a marine rocker arm forging, characterized in that the method includes the following steps:

[0007] 1) Place the rocker arm forging on the lower module and drive the upper module to move downward to form an impact. During the forming process, the rocker arm forging forms a flash through a bridge.

[0008] 2) By adjusting the mold closing distance H between the upper and lower control modules to 8-15mm, more than one independent non-intersecting horizontal surface will be formed on the upper surface of the rocker arm forging, and there will be folds. The possibility of folds in the rocker arm forging is determined by the deformation state.

[0009] 3) By adjusting the length of the blanking part of the rocker arm, and after subsequent forging, when the number of horizontal planes on the upper surface of the pre-forged part of the rocker arm forging is 1, and there are no folds on the upper surface of the rocker arm forging, the forging of the rocker arm forging is completed.

[0010] The technical effects of this invention are as follows:

[0011] This invention provides an intuitive basis for determining and optimizing the pre-forging dimensions and shape of rocker arm forgings, filling the gap in forging simulation for judging shallow surface cracks in forgings.

[0012] The present invention determines that the forging of the rocker arm forging is complete when a block of horizontal surface is formed on the upper surface of the rocker arm forging and there are no folds on the upper surface of the rocker arm forging. Attached Figure Description

[0013] Figure 1 This is a folded surface pattern of a marine rocker arm forging.

[0014] Figure 2 This is a diagram of the pre-forged part of a marine rocker arm die forging.

[0015] Figure 3 This is a drawing of a forged blank for a marine rocker arm.

[0016] In the figure: 1-upper module, 2-rocker arm forging, 3-lower module, 4-flash, 5-bridge, 6-fold, 7-rocker arm pre-forging, 8-horizontal surface of pre-forging, 9-rocker arm forging pre-forging, 10-horizontal surface of pre-forging, 11-rocker arm blank. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 The present invention discloses a forging method for marine rocker arm forgings, the method comprising the following steps:

[0019] 1) Place the rocker arm forging 2 on the lower module 3 and drive the upper module 1 to move downward to form an impact. During the forming process, the rocker arm forging 2 forms a flash 4 through the bridge 5.

[0020] 2) By adjusting the mold closing distance H between the upper control module 1 and the lower control module 3: 8 to 15 mm, more than two independent non-intersecting horizontal surfaces 8 and 10 will be formed on the upper surface of the rocker arm forging 2, and there will be folds 6. The possibility of folds 6 appearing in the rocker arm forging 2 can be determined by the deformation state.

[0021] 3) Adjust the material distribution length dimensions a, b, and c of the rocker arm blank 11. By reducing b and increasing a and c, after subsequent forging, when the number of horizontal planes on the upper surface of the pre-forged part 9 of the rocker arm die forging 2 is 1, and there are no folds 6 on the upper surface of the rocker arm die forging 2, the forging of the rocker arm die forging is completed.

[0022] See Figure 2 When the mold closing distance H between the upper module 1 and the lower module 3 is 8-15mm, more than two pre-forged horizontal surfaces 8 and 10 will appear on the upper surface of the rocker arm forging pre-forged part 9, resulting in surface folds 6 after die forging. (See reference...) Figure 3 By adjusting the material distribution length of the rocker arm blank, and through subsequent forging, the number of horizontal planes on the upper surface of the pre-forged part 9 is 1, and there are no folds on the upper surface of the rocker arm die forging part 2.

[0023] This invention adjusts the dimensions of the blank 11 and determines whether the final die forging has folds by observing the surface condition of the pre-forging. Currently, neither process demonstration nor actual production will analyze the state of the pre-forging. The determination and optimization of the pre-forging dimensions and shape of the rocker arm die forging 2 provides an intuitive basis and fills the gap in die forging simulation for judging shallow cracks on the surface of die forgings.

[0024] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A forging method for a marine rocker arm die forging, characterized in that... The method includes the following steps: 1) Place the rocker arm forging (2) on the lower module (3) and drive the upper module (1) to move downward to form a strike. During the forming process, the rocker arm forging (2) forms a flash (4) through the bridge (5). 2) When the mold closing distance H between the upper module (1) and the lower module (3) is 8~15mm, more than two pre-forged horizontal surfaces (8, 10) appear on the upper surface of the rocker arm forging pre-forging part (9). After the forging is formed, surface folding (6) will occur. The possibility of the rocker arm forging part (2) folding (6) is determined by the deformation state. 3) By adjusting the material distribution length of the rocker arm blank (11), and after subsequent forging, when the number of horizontal planes on the upper surface of the pre-forged part (9) is 1, and there is no fold (6) on the upper surface of the rocker arm die forging part (2), the forging of the rocker arm die forging part is completed.

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