An improved design method and usage method for the mushroom head of a rotary forging machine

Abstract

The present invention provides an improved design method and usage method for the mushroom head of a rotary forging machine, comprising the following steps: the arc surface of the new mushroom head is changed from a single arc to a multi-segment arc structure, the umbrella top height of the new mushroom head is the same as that of the original mushroom head, the multi-segment arc structure sequentially includes an R1 segment, an R2 segment, and an R3 segment from the umbrella top to the umbrella bottom, the bending directions of the R1 segment and the R3 segment are downward, the bending direction of the R2 segment is upward, and both the R1 segment and the R2 segment, and the R2 segment and the R3 segment are arc-transition-connected. The height difference h between the highest point of the R1 segment and the midpoint of the R2 segment is set to 1.4 - 1.6 mm, so that only the R1 segment of the new mushroom head contacts the roller during rotary forging work. Replace the new mushroom head on the rotary forging machine and regularly maintain the new mushroom head. The present invention solves the problems of large forging force, high noise, and mold jamming in the existing rotary forging machine, as well as the problem of short service life of the existing mushroom head.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical design, and particularly relates to an improved design method and usage method for the mushroom head of a rotary forging machine. Background Art

[0002] For the X50J rotary forging machine and other models designed by Xi'an Innovation Company, the mushroom head adopts a single arc structure design. This structure causes the mushroom head to always be in contact with the roller during rotary forging, resulting in a decrease in the mold opening and closing degree, thereby reducing the springback amount of the part after forging, and ultimately causing the spline mold to get stuck in the part, and also increasing the forging force and noise. As Figure 1 shown, the X50J rotary forging machine includes a forging box body D, a roller B, a mushroom head A, and a mold C. The mushroom head A is installed between the roller B and the mold C. Summary of the Invention

[0003] Aiming at the problems in the above-mentioned prior art, the present invention aims to provide an improved design method and usage method for the mushroom head of a rotary forging machine to solve the problems of large forging force, high noise, and mold jamming of the existing rotary forging machine, as well as the problem of short service life of the existing mushroom head.

[0004] To achieve the above object, the present invention proposes an improved design method and usage method for the mushroom head of a rotary forging machine, including the following steps:

[0005] S1. Analyze the movement of the original mushroom head during rotary forging, determine the umbrella top height of the original mushroom head according to the contact point between the roller and the original mushroom head during rotation, complete the design of the new mushroom head. The umbrella top height of the new mushroom head is the same as that of the original mushroom head. The arc surface of the new mushroom head is changed from a single arc to a multi-segment arc structure. The multi-segment arc structure includes an R1 segment, an R2 segment, and an R3 segment in sequence from the umbrella top to the umbrella bottom. The bending directions of the R1 segment and the R3 segment are downward, the bending direction of the R2 segment is upward, and the R1 segment and the R2 segment, and the R2 segment and the R3 segment are all connected by arc transitions. Set the height difference h between the highest point of the R1 segment and the midpoint of the R2 segment to be 1.4 - 1.6 mm, so that only the R1 segment of the new mushroom head contacts the roller during rotary forging, thereby making the new mushroom head A2 indirectly contact the roller B during rotary forging;

[0006] S2. Process the new mushroom head according to the design and replace the new mushroom head on the rotary forging machine;

[0007] S4. Complete the forging of the part through the rotary forging machine;

[0008] S5. Regularly maintain the new mushroom head and perform stress relief annealing treatment on the new mushroom head according to the forging frequency.

[0009] In the above scheme: the new mushroom head is subjected to stress relief annealing after processing 20,000 to 30,000 parts with the "recessed" method, and the new mushroom head is subjected to stress relief annealing after processing 10,000 to 15,000 parts with the "push-type" method. A regular stress relief annealing process is added, and stress relief annealing treatment is set after different frequencies of use according to the processing characteristics of the two different forging methods, the "push-type" and the "recessed" method. This can increase the service life of the mushroom head, eliminate the need for frequent replacement of the mushroom head, and effectively reduce production costs.

[0010] In the above scheme: the height difference h between the highest point of the R1 segment and the midpoint of the R2 segment is 1.5 mm, which can not only ensure the intermittent contact between the mushroom head and the roller, but also ensure that the mushroom head will not completely separate from the roller, thereby ensuring continuous forging of the workpiece, increasing the rebound time, thereby reducing the forging force and reducing noise.

[0011] In the above scheme: stress relief annealing parameters are: heating to 570-630 degrees and keeping warm for 8-10 hours.

[0012] The beneficial effects of the present invention are:

[0013] The original mushroom head adopts a single arc structure, which causes the mushroom head to be in contact with the roller during rotary forging. The present invention changes the single arc structure of the mushroom head into a multi-segment arc structure, so that the mushroom head is in contact with the roller intermittently during the rotary forging process, thereby increasing the springback time and the springback amount of the part during the forging process, making it easier for the part to be demolded, and effectively solving the problems of damage to the core rod caused by the mold jamming of the rotary forging machine, as well as the large forging force and noise; and provides a method for stress relief annealing and maintenance of the mushroom head after regular use, thereby increasing the service life of the mushroom head, and improving product quality and processing stability;

[0014] The new mushroom head can be made by improving the original mushroom head, thus avoiding the waste of resources caused by the abandonment of the original mushroom head. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of a rotary forging machine.

[0016] Figure 2 It is a schematic diagram of the structure of the original mushroom head.

[0017] Figure 3 This is a schematic diagram of the structure of the new mushroom head. DETAILED DESCRIPTION

[0018] like Figure 3 As shown, an improved design method and use method of a rotary forging machine mushroom head mainly consists of the following steps:

[0019] Analyze the movement of the original mushroom head A1 during the rotary forging process. The original mushroom head A1 will always be in contact with the roller B during the rotary forging operation, resulting in a decrease in the mold opening and closing degree, thereby reducing the springback amount of the part after forging, and ultimately causing the spline mold to get stuck in the part, and also increasing the forging force and noise. Determine the umbrella top height of the original mushroom head A1 based on the contact point between the roller B and the original mushroom head A1 during the rotation process, and complete the design of the new mushroom head A2.

[0020] The umbrella top height of the new mushroom head A2 is the same as that of the original mushroom head A1. The arc surface of the new mushroom head A2 is changed from a single arc to a multi-segment arc structure. The multi-segment arc structure successively includes an R1 segment, an R2 segment, and an R3 segment from the umbrella top to the umbrella bottom. The bending directions of the R1 segment and the R3 segment are downward, the bending direction of the R2 segment is upward, and both the R1 segment and the R2 segment, and the R2 segment and the R3 segment are arc-transition connected.

[0021] Set the height difference h between the highest point of the R1 segment and the midpoint of the R2 segment to 1.4 - 1.6 mm, so that only the R1 segment of the new mushroom head A2 is in contact with the roller B during the rotary forging operation, thereby enabling the new mushroom head A2 to be intermittently in contact with the roller B during the rotary forging process, increasing the springback time during the part forging process, enhancing the springback amount, and making it easier for the part to be demolded.

[0022] Machine the new mushroom head A2 according to the design and replace the new mushroom head A2 on the rotary forging machine. The new mushroom head A2 can be improved and processed from the original mushroom head A1, avoiding waste of resources caused by the abandonment of the original mushroom head A1.

[0023] Complete the forging of the part through the rotary forging machine.

[0024] Regularly maintain the new mushroom head A2 and perform stress relief annealing treatment on the new mushroom head A2 according to the forging frequency. The mushroom head is installed between the roller and the mold, and the force is the largest and most concentrated at the umbrella top position. Therefore, the mushroom head needs to be regularly maintained to extend its service life.

[0025] Preferably, perform stress relief annealing treatment on the new mushroom head A2 after machining 20,000 - 30,000 parts in the "recessed" manner, and perform stress relief annealing treatment on the new mushroom head A2 after machining 10,000 - 15,000 parts in the "pushed-in" manner. By adding a regular stress relief annealing process and setting stress relief annealing treatments after different usage frequencies according to the processing characteristics of the two different forging methods of "pushed-in" and "recessed", the service life of the mushroom head A can be extended, the mushroom head A does not need to be frequently replaced, and the production cost can be effectively reduced.

[0026] Preferably, the height difference h between the highest point of the R1 segment and the midpoint of the R2 segment is 1.5 mm, which can not only ensure the intermittent contact amount between the mushroom head A and the roller B, but also ensure that the mushroom head A does not completely disengage from the roller B, ensuring continuous forging of the workpiece, increasing the springback time, thereby reducing the forging force and noise.

[0027] Preferably, the stress relief annealing parameters are: heating to 570 - 630 °C and holding for 8 - 10 hours.

Claims

1. An improved design method for the mushroom head of a rotary forging machine, characterized in that, it includes the following steps: S1. Analyze the movement of the original mushroom head (A1) during the rotary forging process. Determine the umbrella top height of the original mushroom head (A1) according to the contact point between the roller (B) and the original mushroom head (A1) during the rotation process, and complete the design of the new mushroom head (A2). The umbrella top height of the new mushroom head (A2) is the same as that of the original mushroom head (A1). The arc surface of the new mushroom head (A2) is changed from a single arc to a multi-segment arc structure. The multi-segment arc structure successively includes an R1 segment, an R2 segment, and an R3 segment from the umbrella top to the umbrella bottom. The bending directions of the R1 segment and the R3 segment are downward, the bending direction of the R2 segment is upward, and both the R1 segment and the R2 segment, and the R2 segment and the R3 segment are arc-transition-connected. Set the height difference h between the highest point of the R1 segment and the midpoint of the R2 segment to 1.4 - 1.6 mm, so that only the R1 segment of the new mushroom head (A2) contacts the roller (B) during the rotary forging operation, thereby making the new mushroom head (A2) indirectly contact the roller (B) during the rotary forging operation; S2. Process the new mushroom head (A2) according to the design and replace the new mushroom head (A2) on the rotary forging machine; S4. Complete the forging of the parts through the rotary forging machine; S5. Regularly maintain the new mushroom head (A2) and perform stress relief annealing treatment on the new mushroom head (A2) according to the forging frequency.

2. The improved design method for the mushroom head of a rotary forging machine according to claim 1, characterized in that: After the new mushroom head (A2) is processed in the "recessed" manner for 20,000 - 30,000 parts, stress relief annealing treatment is carried out. After the new mushroom head (A2) is processed in the "pushing" manner for 10,000 - 15,000 parts, stress relief annealing treatment is carried out.

3. The improved design method for the mushroom head of a rotary forging machine according to claim 1, characterized in that: The height difference h between the highest point of the R1 segment and the midpoint of the R2 segment is 1.5 mm.

4. The improved design method for the mushroom head of a rotary forging machine according to claim 1, characterized in that: The stress relief annealing parameters are: heating to 570 - 630 degrees and holding for 8 - 10 hours.

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