A method for die forging a flying car arm joint

Abstract

The application discloses a die forging method for a flying car arm joint, and specifically comprises the following steps: S1: placing a pretreated blank after heating in a forming cavity of a half die mold, under the action of one stroke of a press machine, a punch extrudes the blank so that part of the metal of the blank flows into a boss forming cavity of the half die mold, and an extruded blank with an inner buckle boss is obtained through extrusion forming; and S2: placing the extruded blank after heating in a forming cavity of a finish forging mold, after positioning and placing the extruded blank in the finish forging mold by using the inner buckle boss of the extruded blank, performing forging to obtain a target forged piece, and the forming cavity of the finish forging mold is consistent with the outer contour of the target forged piece. The application adopts a production process combining half die extrusion and die forging, obtains a suitable blank for die forging, can not only solve the die forging folding problem of a product, but also can reduce the tonnage of a forging equipment, improve the raw material utilization rate of a forged piece, and improve product consistency and production efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of die forging forming, and particularly relates to a die forging method for a flying car arm joint. BACKGROUND

[0002] The flying car arm joint needs to be produced by a forging process due to high performance requirements. Conventional forging processes mainly include free forging block milling processing and block direct die forging. The free forging block milling processing has low production efficiency, large processing amount, high production cost and low raw material utilization (7.5%). The block direct die forging adopts aluminum blocks as blank forgings, which not only has high forging tonnage and low raw material utilization (13.4%), but also has the problems of difficult positioning of products in the forging process, serious workpiece folding, poor production consistency and high product scrap rate. Therefore, it is particularly important to propose a die forging process capable of improving raw material utilization and product production consistency for the production of the flying car arm joint.

[0003] The patent adopts a production route of block-half die extrusion-die forging to obtain a suitable blank for die forging, solve the problem of product die forging folding, reduce the equipment tonnage, improve the raw material utilization of forgings, and improve the product consistency and production efficiency. SUMMARY

[0004] In view of the problems in the prior art, the application discloses a die forging method for a flying car arm joint, which adopts a production process combining half die extrusion and die forging to obtain a suitable blank for die forging, can not only solve the problem of product die forging folding, but also reduce the tonnage of forging equipment, improve the raw material utilization of forgings, and improve the product consistency and production efficiency.

[0005] The above technical purpose of the application is achieved by the following technical scheme:

[0006] A die forging method for a flying car arm joint, characterized in that the specific method is as follows:

[0007] S1: placing the pretreated blank after heating in the forming cavity of the half die mold, under the action of the press once, the punch extrudes the blank to make part of the metal of the blank flow into the boss forming cavity of the half die mold, and an extruded blank with an inner buckle boss is obtained by extrusion forming;

[0008] S2: placing the extruded blank after heating in the forming cavity of the finish forging mold, after positioning and placing in the finish forging mold by using the inner buckle boss of the extruded blank, performing forging to obtain a target forging, and the forming cavity of the finish forging mold is consistent with the outer contour of the target forging.

[0009] Preferably, in S1, the blank pretreatment method is free forging block processing on the heated bar.

[0010] Preferably, in the S1, the half-mold die comprises a female mold I, a female mold II and a die sleeve, the female mold I and the female mold II are vertically placed in the die sleeve after being closed, and the demolding is performed by the backflush female mold after the extrusion forming is completed.

[0011] Preferably, the female mold I and the female mold II cooperatively form a forming cavity, one side of the forming cavity is designed with a boss forming cavity, and the position and profile of the boss forming cavity are matched with the protruding part of the forming cavity of the finish-forging die.

[0012] Beneficial effects: The application discloses a die forging method for a flying car arm joint, and has the following advantages:

[0013] (1) In the application, a production process combining half-mold extrusion and die forging is used to replace a free forging production process, so that the production cost is reduced, and the equipment tonnage requirement is lowered.

[0014] (2) In the application, the half-mold extrusion is performed before finish forging to form an extrusion blank with an inner buckle boss, so that the blank positioning and placement can be performed in finish forging (the original square blank cannot be positioned), the blank can be pre-divided before finish forging, the die forging folding problem is solved, the final product is small on the side, and the raw material utilization rate is high. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the target forging of Example 1.

[0016] Figure 2 It is a half-mold extrusion forming schematic view of Example 1.

[0017] Figure 3 It is a half-mold die partial explosion schematic view of Example 1.

[0018] Figure 4 It is a finish-forging die explosion schematic view of Example 1.

[0019] Figure 5 It is an extrusion blank placement schematic view of Example 1.

[0020] Figure 6 It is a die forging simulation schematic view of a traditional square block direct die forging.

[0021] Figure 7 It is a die forging simulation schematic view of Example 1.

[0022] In the figure, 1 is a female mold I, 2 is a female mold II, 3 is a die sleeve, 4 is a boss forming cavity, 5 is a finish-forging die, 5-1 is a protruding part, 6 is a punch, and 7 is an extrusion blank. IMPLEMENTATION

[0023] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application. Embodiment

[0024] The outer shape of the flying car arm joint of the material 7075 is shown in Figure 1 . The final forging die 5 and the half-die die are designed for the target forging shown in Figure 1 . As shown in Figure 4 , the final forging die 5 includes an upper die and a lower die, and the forming cavity formed by the cooperation of the upper die and the lower die is consistent with the outer contour of the target forging. As shown in Figures 2-3 , the half-die die includes a female die I 1, a female die II 2 and a die sleeve 3, and the female die I 1 and the female die II 2 are vertically placed in the die sleeve 3 after being closed. The forming cavity formed by the cooperation of the female die I 1 and the female die II 2 is designed with a boss forming cavity 4 on one side, and the position and contour of the boss forming cavity 4 match the protruding part 5-1 of the forming cavity of the final forging die 5.

[0025] Based on the above-mentioned final forging die 5 and half-die die, the die forging method of the 7075 flying car arm joint shown in Figure 1 is as follows:

[0026] Step 1: cut the aluminum plate blank 190*120*70 (mm) with a weight of 4.6 kg;

[0027] Step 2: pretreatment, heat the blank to 440℃, then forge the blank into a square blank of 70*120*203 (mm), and obtain the square blank;

[0028] Step 3: heat the square blank to 440℃, then place the square blank in the forming cavity of the half-die die, under the action of the one-way stroke of the press, the punch 6 extrudes the blank so that part of the metal of the square blank flows into the boss forming cavity of the half-die die, and the extruded blank with an internal buckle boss is obtained by forward extrusion forming, and after the extrusion forming is completed, the extruded blank 7 and the female die are naturally separated by the backflush female die (female die I and female die II).

[0029] Step 4: heat the extruded blank to 440℃, as shown in Figure 5 , place the extruded blank 7 in the forming cavity of the final forging die 5, and then use the 1000T press to perform die forging to obtain the target forging.

[0030] Compared with the traditional free forging process (which requires 11.5 kg of feeding), the die forging process of this embodiment 1 only needs to feed 4.6 kg, and the raw material utilization rate is increased by 60%, and the forging part is close to the product contour, so that the machining cost is greatly reduced.

[0031] Compared with the traditional square block direct die forging process (the equipment requirement tonnage is 2000T), the forging tonnage required by the die forging process of the embodiment 1 is only 1000T, and the equipment requirement is obviously reduced.

[0032] In addition, as Figure 6 The die forging simulation diagram of the traditional square block direct die forging is shown, and it can be obviously seen from the diagram that the square blank generates folding at multiple places in the die forging process, which seriously affects the product quality and the scrap rate is high. Figure 7 The die forging simulation diagram of the die forging process of the embodiment 1 is shown, and it can be obviously seen from the diagram that the extrusion blank does not generate folding in the die forging process. This is because the process pre-divides the blank through extrusion forming, so that the extrusion blank cooperates with the finish forging die, avoids multiple recesses and bends in the die forging forming process, thereby solving the folding problem. And the inner buckle boss formed by the extrusion blank can also be positioned by cooperating with the finish forging die, thereby further improving the product qualification rate and ensuring the product consistency.

[0033] The specific embodiment is only an explanation of the application, and is not a limitation of the application. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, but as long as it is within the scope of the claims of the application, it is protected by the patent law.

Claims

1. A die forging method for a joint of an airborne vehicle arm, characterized in that, The specific method is as follows: S1: The heated pre-treated billet is placed in the forming cavity of the half-die. The half-die includes female die I, female die II and die sleeve. After the female die I and female die II are closed, they are placed vertically in the die sleeve. Under the action of the press in one stroke, the punch extrudes the billet, causing part of the metal of the billet to flow into the boss forming cavity of the half-die. The extruded billet with an inner boss is obtained by extrusion forming. After the extrusion forming is completed, the billet is demolded by back-jetting female die; S2: The heated extruded billet is placed in the forming cavity of the final forging die. After the inner boss of the extruded billet is used to achieve positioning in the final forging die, the target forging is obtained by forging. The forming cavity of the final forging die is consistent with the outer contour of the target forging.

2. The die forging method for the boom joint of a flying car according to claim 1, characterized in that, In S1, the billet pretreatment method is to perform free forging on the heated bar stock.

3. The die forging method for the boom joint of a flying car according to claim 1, characterized in that, The forming cavity formed by the cooperation of female mold I and female mold II has a boss forming cavity on one side. The position and contour of the boss forming cavity match the protruding part of the forming cavity of the final forging die.

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