Square plate type titanium alloy forge piece die

Abstract

The utility model belongs to the technical field of forging die tools for forging, and relates to a square plate type titanium alloy forge piece die. The forge piece die comprises an upper die and a lower die. The upper die is a flat plate die, grooves protruding outwards are additionally formed in the positions, at the four corners of a die cavity, of the lower die, and therefore the cavity face of the lower die is divided into a plane located in the middle and used as an original die bottom plane, round groove planes located at the four corners of the plane and transition slopes connecting the plane and the round groove planes.

Description

Technical Field

[0001] The utility model belongs to the technical field of forging die tooling for forging, and relates to a square plate type titanium alloy forging die. Background Art

[0002] As the most common forging shape in the forging process, square plate forgings have the advantages of simple shape and size, strong versatility, and great production flexibility. They are widely used in the blanking of die forgings, trial production of new products, and production of large forgings. However, square plate forgings have low precision and large machining allowance. In reality, many parts have right-angle transitions, and there is a high risk of missing meat at the corners during the final part processing. In addition, titanium alloy materials have poor plasticity and thermal conductivity. During the forging deformation process, the fluidity is poor and the flow resistance is large, making filling difficult. According to the law of minimum resistance of forging deformation, the four corners of the mold cavity are the most difficult to form areas, and the final blank has a large rounded corner. In actual production, in order to make the forgings meet the final part processing requirements, on the one hand, the machining allowance of the forging blank is increased, the outline size and weight of the forging are increased, thereby reducing the risk of not processing right-angle parts from the forging corners; on the other hand, after forging, the forging fire is increased for forgings with large rounded corner transitions, and then 1 to 2 rounded corner shaping is performed to meet the part processing size requirements. The above two solutions not only increase the consumption of raw materials for forging and the cost of the production process, but also have a significant impact on the structure and performance of the titanium alloy forgings themselves, reducing the quality of the forgings. Utility Model Content

[0003] The utility model aims to solve the problem that the four corners of square plate-type titanium alloy forgings are difficult to form, while ensuring the matching of forging structure and performance, improving the dimensional accuracy and production efficiency of forgings, and further reducing the consumption of raw materials and production costs for forgings.

[0004] Technical solution:

[0005] The utility model provides a square plate titanium alloy forging die, comprising: an upper die and a lower die;

[0006] The upper mold is a flat mold, and the lower mold has outward protruding grooves added at the four corners of the mold cavity, so that the cavity surface of the lower mold is divided into a plane located in the middle as the bottom plane of the original mold, circular groove planes located at the four corners of the plane, and transition slopes connecting the plane and the circular groove plane.

[0007] Furthermore, the plane of the circular groove is ∼5 mm lower than the plane of the bottom plane of the original mold.

[0008] Furthermore, the inclination angle of the transition slope is 3 to 5 degrees.

[0009] Furthermore, the cross section of the transition slope is fan-shaped, and the radius of the transition slope is greater than the radius of the circular groove plane, so as to facilitate smooth transition between the transition slope and the circular groove plane.

[0010] Furthermore, the center of the circular groove plane is located within a right angle to the bottom plane of the original mold; and the distance from the center to the plane side wall is smaller than the radius of the circular groove plane.

[0011] Furthermore, the plane, the transition arc slope and the circular groove plane are transitioned with a R150mm fillet.

[0012] The beneficial effects of the utility model are as follows: on the basis of the original forging mold cavity, the cavity working surface is divided into three parts: the cavity bottom plane, the transition arc-shaped inclined plane and the circular groove plane, and the circular groove and arc-shaped inclined plane transition are added at the four corners of the mold cavity. According to the law of least resistance, when the blank reaches the four corners of the cavity, the design of the inclined plane and the circular groove reduces the flow resistance of the blank, which is conducive to filling the four corners of the lower mold cavity and obtaining the size requirements of the drawing; the number of forging forming fires is reduced, which is conducive to the organization and performance matching of titanium alloy forgings; the tonnage of equipment required for forging forming is reduced, and the required deformation of the blank is guaranteed; and the size of the forging blank is also reduced, saving raw materials and energy consumption, and further reducing the production cost of forgings during the forming process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a square plate titanium alloy forging die.

[0014] Figure 2 This is a top view of the lower mold.

[0015] Figure 3a It is the front view of the mold cavity;

[0016] Figure 3b It is the top view of the mold cavity;

[0017] Figure 4 This is an enlarged view of the mold cavity local A;

[0018] Among them: 21- cavity bottom plane, 22- transition arc slope, 23- circular groove plane DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0020] The utility model provides a square plate type titanium alloy forging die, such as Figure 1 ,2 , 3a, 3b and 4, including: a plane 21, a transition slope 22 and a circular groove plane 23.

[0021] Plane 21 is the bottom plane of the original mold, and circular groove plane 23 is a newly designed circular groove plane, which is 5 mm lower than plane 21. Plane 21 and circular groove plane 23 are connected by a transition slope 22 that forms an angle of 3 to 5° with the circular groove plane.

[0022] The cross section of the transition slope 22 is fan-shaped, and its radius is greater than the radius of the circular groove plane 23 .

[0023] The center of the circular groove 23 is in the right-angle cavity, and the radius is greater than the distance from the center to the straight arm of the cavity, so that the circular groove covers the right-angle position of the cavity;

[0024] The cavity bottom plane 21, the transition arc slope 22 and the circular groove plane 23 are transitioned with a fillet of R150mm.

[0025] The utility model optimizes the design of the mold cavity and, according to the metal plastic forming principle, adds circular grooves and arc-shaped inclined surface transitions at the four corners of the mold cavity to reduce metal flow resistance and make the four corners of the mold cavity easy to form, thereby reducing raw material and production costs and improving the qualified rate of forgings.

[0026] The utility model provides a square plate titanium alloy forging die, which includes an upper die 1 for a blank, a lower die 2, and a cavity bottom plane 21, a transition arc slope 22, and a circular groove plane 23. The upper die is a flat die, and the lower die has a cavity. The blank is placed in the lower mold cavity. Figure 2 As shown, the lower die adds circular groove design and arc-shaped inclined surface transition at the four corners of the cavity. The center of the circular groove 23 is in the right-angle cavity, and the radius is greater than the distance from the center to the straight arm of the cavity, so that the circular groove covers the right angle position of the cavity; the radius of the arc-shaped inclined surface 22 is greater than the radius of the circular groove plane 23; the circular groove plane 23 is lower than the plane 21 by ~5mm, and then the arc-shaped inclined surface 22, which is at an angle of 3~5° with the plane 23, connects the planes 21 and 23 into one. The cavity bottom plane 21, the transition arc-shaped inclined surface 22 and the circular groove plane 23 are transitioned with a fillet of R150mm.

[0027] During the forging process, as the upper die is pressed down, the blank gradually flows around the cavity. According to the law of least resistance, the resistance of the four corner planes 21 of the cavity is the largest. As the metal flows, when it contacts the arc-shaped inclined surface 22, due to the height difference between the four corner planes 21 of the cavity and the circular groove plane 33, the metal flow resistance is instantly reduced, so that the metal quickly flows into the circular groove plane 23. Because the circular groove plane 23 is larger than the right-angle cavity area, the circular groove plane 23 can reserve excess metal in the right-angle cavity part at this time, thereby ensuring the right-angle processing size requirements of the part.

[0028] When the upper die moves downward, the blank begins to flow and undergo plastic deformation in the lower mold cavity, filling the lower mold cavity. According to the law of least resistance, when the blank reaches the four corners of the cavity, the design of the inclined surface and circular groove reduces the flow resistance of the blank, which is conducive to filling the four corners of the lower mold cavity and obtaining the size requirements of the drawing; the number of forging fires is reduced, which is beneficial to the matching of the microstructure and performance of titanium alloy forgings; the tonnage of equipment required for forging is reduced, and the required deformation of the blank is guaranteed; and the size of the forging blank is also reduced, saving raw materials and energy consumption, further reducing the production cost of forgings during the forming process.

[0029] The parts of a certain type of aircraft are high-strength square plate-type titanium alloy forgings with a size of 1200×450×40mm. The process of this type of titanium alloy forgings requires a small number of forgings and sufficient deformation to ensure that the final forgings meet the standard requirements. In fact, the four fillet positions of the forging are difficult to form during the forming process. Even after adding multiple forgings and repairs, the forging fillet still reaches more than R50, which not only increases the risk of final processing and scrapping of the parts, but also greatly reduces the organization and mechanical properties of the forgings. After optimizing the design of the mold cavity according to this utility model, the blank completes the filling of the four corners of the cavity with the least number of fires and the minimum pressure, and then through subsequent fillet machining and finishing, the fillet of the four corners of the forging can reach less than R5, or even a right angle R0, which greatly reduces the consumption of raw materials and forging production costs, and further improves the metallurgical quality of the forgings.

Claims

1. A square plate titanium alloy forging die, characterized in that: include: Upper die and lower die; The upper mold is a flat mold, and the lower mold has outward protruding grooves added at the four corners of the mold cavity, so that the cavity surface of the lower mold is divided into a plane located in the middle as the bottom plane of the original mold, circular groove planes located at the four corners of the plane, and transition slopes connecting the plane and the circular groove plane.

2. The mold according to claim 1, characterized in that: The plane of the circular groove is 5 mm lower than the plane of the bottom plane of the original mold.

3. The mold according to claim 1, characterized in that: The inclination angle of the transition slope is 3 to 5 degrees.

4. The mold according to claim 1, characterized in that: The cross section of the transition slope is fan-shaped, and the radius of the transition slope is greater than the radius of the circular groove plane, so as to facilitate smooth transition between the transition slope and the circular groove plane.

5. The mold according to claim 1, characterized in that: The center of the circular groove plane is located within the right angle of the bottom plane of the original mold; the distance from the center to the side wall of the plane is less than the radius of the circular groove plane.

6. The mold according to claim 1, characterized in that: The plane, transition arc slope and circular groove plane are transitioned with R150mm fillet.

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