Titanium alloy open frame forging preform blank and forging method and die thereof

Abstract

The present application discloses a titanium alloy open frame forging preform and its forging method and die, which specifically belongs to the field of forging process technology. According to the volume and size of the target forging, the volume and size of the preform are determined; the bar is selected according to the size of the preform; the bar is forged at a preset temperature to obtain a first slab; the first slab is cut according to the shape of the target forging, and the first slab is divided into a preset number of structural parts; the corresponding structural parts are forged at a preset temperature according to the size of the preform to obtain the preform. The bar is effectively distributed by cutting to obtain a preset number of structural parts, and then each structural part is forged separately, which can make full use of the bar, reduce material loss during the forging process, significantly improve material utilization, and reduce the difficulty of operation during the forging process.

Description

Technical Field

[0001] The present application relates to the field of forging technology, and in particular to a titanium alloy open frame forging preform blank and a forging method and a die thereof. Background Art

[0002] The open frame (M-type structure) is an important load-bearing structural part widely used in aviation aircraft. It is generally made of high-performance titanium alloy. The typical open frame forging structure includes a middle and side connecting section and / or side sections at both ends. This type of part is generally manufactured using the following two methods. The first is to forge it into several sections, and then weld it into a whole frame after processing. This method has a complex manufacturing process and low material utilization, resulting in high manufacturing costs and long cycles. The second method is to use direct die forging of plates, which has extremely low material utilization. Summary of the invention

[0003] The main purpose of the present application is to provide a titanium alloy open frame forging preform blank and its forging method and die, aiming to solve the technical problem of low material utilization rate of the existing forging method.

[0004] To achieve the above-mentioned objectives, the present application provides a forging method for a titanium alloy open frame forging preform, comprising: determining the volume and size of the preform according to the volume and size of the target forging; selecting a bar according to the size of the preform; forging the bar at a preset temperature to obtain a first slab; cutting the first slab according to the shape of the target forging, dividing the first slab into a preset number of structural parts; forging the corresponding structural parts at a preset temperature according to the size of the preform to obtain the preform.

[0005] Optionally, the volume and size of the preform are determined according to the volume and size of the target forging, including: determining the volume of the preform according to the volume of the target forging, wherein the volume of the preform is equal to a preset number of times the volume of the target forging; determining the initial size of the preform according to the volume of the preform, the size and shape of the target forging; and optimizing the initial size to obtain the size of the preform.

[0006] Optionally, the preform includes at least an intermediate structural portion, a first connecting segment and a second connecting segment, and selecting a rod according to the size of the preform includes: determining a cross-sectional area of ​​the rod according to the maximum cross-sectional area of ​​the intermediate structural portion, the first connecting segment or the second connecting segment; determining a length of the rod according to the volume of the preform and the cross-sectional area of ​​the rod; wherein the cross-sectional area of ​​the rod is greater than the maximum cross-sectional area of ​​the intermediate structural portion, or the cross-sectional area of ​​the rod is greater than twice the maximum cross-sectional area of ​​the first connecting segment or the second connecting segment.

[0007] Optionally, the preset temperature is (Tβ-30)°C to (Tβ-70)°C, wherein Tβ is the phase transition point temperature.

[0008] Optionally, the first slab is cut according to the shape of the target forging, and the first slab is divided into a preset number of structural parts, including: cutting the first slab along a first direction to form a first cutting seam on the first slab to obtain a second slab; wherein the first direction is the length direction of the first slab, and the first cutting seam extends from one end of the first slab to the other end by a preset length, and the preset length is less than the length of the first slab; in the second direction, the parts on both sides of the first cutting seam respectively constitute the first structural part and the second structural part of the second slab, and the second direction is perpendicular to the first direction; the remaining part of the second slab constitutes the third structural part of the second slab; the volume of the first structural part and the second structural part is the same, and is twice the volume of the third structural part.

[0009] Optionally, the corresponding structural parts are forged at a preset temperature according to the size of the prefabricated billet to obtain the prefabricated billet, including: at a preset temperature, forging and separating the second slab along the first cutting seam so that the first structural part and the second structural part form a preset angle to obtain a third slab; at a preset temperature, forging and stretching the third structural part, the first structural part and the second structure according to the size of the prefabricated billet to form the intermediate structural part, the first connecting section and the second connecting section respectively; at a preset temperature, using a mold to bend and form the first connecting section and the second connecting section respectively to obtain the prefabricated billet.

[0010] Optionally, after the first slab is cut along the first direction to form a first cutting seam on the first slab to obtain the second slab, the method further includes: at the first cutting seam, the first structure part and the second structure part are respectively cut along the second direction to form a second cutting seam and a third cutting seam correspondingly; wherein the lengths of the second cutting seam and the third cutting seam are both smaller than the width of the first structure part or the second structure part; the second cutting seam divides the first structure part into a fourth structure part and a fifth structure part of equal volume, the third cutting seam divides the second structure part into a sixth structure part and a seventh structure part of equal volume, the fourth structure part is connected between the third structure part and the fifth structure part, and the sixth structure part is connected between the third structure part and the seventh structure part.

[0011] Optionally, the starting ends of the first cutting slit, the second cutting slit and the third cutting slit are all semicircular, the radius of the starting end of the first cutting slit is a first preset radius, the radii of the starting ends of the second cutting slit and the third cutting slit are both a second preset radius, and the first preset radius is greater than the second preset radius.

[0012] Optionally, the corresponding structural parts are forged according to the size of the prefabricated billet to obtain the prefabricated billet, including: at a preset temperature, forging and separating the second plate billet along the first cutting seam so that the fourth structural part and the sixth structural part form a preset angle to obtain a third plate billet; at a preset temperature, forging and stretching the third structural part, the fourth structural part and the sixth structural part according to the size of the prefabricated billet to form an intermediate structural part, a first connecting section and a second connecting section respectively; at a preset temperature, forging and stretching the fifth structural part and the seventh structural part according to the size of the prefabricated billet to form a first end and a second end respectively, wherein the stretching direction of the fifth structural part and the seventh structural part is opposite to the stretching direction of the third structural part; at a preset temperature, using a mold to bend and form the first connecting section and the second connecting section respectively to obtain the prefabricated billet.

[0013] Optionally, the preset angle is greater than or equal to 100°.

[0014] In addition, to achieve the above-mentioned purpose, the present application also provides a titanium alloy open frame forging preform blank, characterized in that it is obtained by using the forging method of the above-mentioned titanium alloy open frame forging preform blank.

[0015] In addition, to achieve the above-mentioned purpose, the present application also provides a mold for preparing the above-mentioned titanium alloy open frame forging preform, the mold comprising a first mold and a second mold; one end of the first mold has a protrusion that matches the shape of the preform; one end of the second mold has a recessed portion that matches the shape of the preform, and the protrusion is matched with the recessed portion, and is used to bend the first connecting section or the second connecting section of the preform into shape; wherein the second mold is provided with a groove at one end corresponding to the recessed portion, and the second mold accommodates the corresponding structural portion of the preform through the groove.

[0016] Optionally, the second mold includes a first component, a second component and a third component connected in sequence; one end of the second component is recessed to form a recessed portion; the maximum distance between the first mold and the recessed portion is less than or equal to the wall thickness of the first connecting section or the second connecting section; the grooves are the first groove, the second groove and the third groove at the first component, the second component and the third component respectively; wherein the depth of the second groove is equal to the wall thickness of the first connecting section or the second connecting section; the width of the groove in the first direction is equal to the width of the preform in the first direction, and the first direction is perpendicular to the depth direction of the groove.

[0017] Optionally, the first mold includes two parts, and the second mold also includes: a fourth component part, connected to the side of the first component away from the second component part, and the structure of the fourth component part is the same as that of the second component part; a fifth component part, connected to the side of the fourth component part away from the first component part, and the structure of the fifth component part is the same as that of the third component part.

[0018] Optionally, the mold further includes: a first fixing member connected to an end of the first mold away from the protruding portion; and a second fixing member connected to an end of the second mold away from the recessed portion.

[0019] The embodiment of the present application proposes a titanium alloy open frame forging preform blank and its forging method and mold. The size of the preform blank is first determined according to the target forging, and then a rod of suitable specifications is selected according to the size of the preform blank. The rod is effectively distributed by cutting to obtain a preset number of structural parts, and then each structural part is forged separately. The rod can be fully utilized, the material waste in the forging process is reduced, and the material utilization rate is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A flow chart of a forging method for a titanium alloy open frame forging preform blank for the present application;

[0021] Figure 2 This is a schematic structural diagram of a first target forging of a forging method of a titanium alloy open frame forging preform blank in the present application;

[0022] Figure 3 This is a schematic structural diagram of a first preform of a forging method of a titanium alloy open frame forging preform of the present application;

[0023] Figure 4 A schematic diagram of the structure of a bar material in a forging method of a titanium alloy open frame forging preform blank according to the present application;

[0024] Figure 5 This is a schematic structural diagram of a first slab of a forging method of a titanium alloy open frame forging preform in the present application;

[0025] Figure 6 This is a schematic structural diagram of a second slab of a forging method for a titanium alloy open frame forging preform in the present application;

[0026] Figure 7 This is a schematic structural diagram of a third slab of a forging method for a titanium alloy open frame forging preform in the present application;

[0027] Figure 8 This is a schematic structural diagram of a third slab after being stretched in a forging method of a titanium alloy open frame forging preform in the present application;

[0028] Fig. 9 A schematic diagram of the structure of a second target forging of a titanium alloy open frame forging preform blank in the present application;

[0029] Fig.10 This is a schematic structural diagram of another second slab in a forging method of a titanium alloy open frame forging preform in the present application;

[0030] Fig.11 A schematic structural diagram of another third slab of a forging method of a titanium alloy open frame forging preform in the present application;

[0031] Fig.12 This is a schematic structural diagram of another third slab after being stretched in a forging method of a titanium alloy open frame forging preform in the present application;

[0032] Fig.13 This is a schematic structural diagram of a second preform of a forging method of a titanium alloy open frame forging preform of the present application;

[0033] Fig.14 This is a structural schematic diagram of a mold for this application.

[0034] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The first embodiment of the present application provides a titanium alloy open frame forging preform blank, a forging method thereof, and a die, and provides a forging method for a titanium alloy open frame forging preform blank. Figure 1 The flowchart of a forging method of a titanium alloy open frame forging preform blank of this embodiment includes:

[0040] Step S1, determining the volume and size of the preform according to the volume and size of the target forging;

[0041] Step S2, selecting a bar material according to the size of the prefabricated blank;

[0042] Step S3, forging the bar material at a preset temperature to obtain a first slab;

[0043] Step S4, cutting the first slab according to the shape of the target forging, and dividing the first slab into a preset number of structural parts;

[0044] Step S5: forging the corresponding structural parts at a preset temperature according to the size of the prefabricated blank to obtain the prefabricated blank.

[0045] In this embodiment, the size of the preform is first determined according to the target forging, and then a bar of appropriate specifications is selected according to the size of the preform. The bar is effectively distributed by cutting to obtain a preset number of structural parts, and then each structural part is forged separately. This can fully utilize the bar, reduce material waste in the forging process, and significantly improve material utilization.

[0046] It can be understood that the target forging is the forging that needs to be forged. In this embodiment, the target forging can be Figure 2 The M-shaped opening frame shown may also be a forging of other structures, which can be pre-designed according to the requirements. The prefabricated blank is a prefabricated forging obtained by the method of this embodiment, and the prefabricated forging needs to be processed through a subsequent die forging process to obtain a forging that meets the requirements.

[0047] The specific process of determining the volume and size of the preform according to the volume and size of the target forging in step S1 is introduced below.

[0048] Step S11, determining the volume of the preform according to the volume of the target forging, wherein the volume of the preform is equal to a preset number of times the volume of the target forging;

[0049] Step S12, determining the initial size of the preform according to the volume of the preform, the size and shape of the target forging;

[0050] Step S13, optimizing the initial size to obtain the size of the prefabricated blank.

[0051] In this embodiment, the volume of the preform is first determined according to the volume of the target forging, and then the initial size of the preform is determined according to the size and shape of the volume target forging of the preform, and finally the initial size is fine-tuned to obtain the optimal size. The size of the preform determined in the above manner can ensure the subsequent selection of bars of appropriate specifications, further avoid material waste due to improper bar selection, and ensure that the size deviation of the preform can be reduced, thereby improving the quality of the preform.

[0052] In an exemplary embodiment, the preset number of times may be 1.2-1.8, for example, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, etc.

[0053] In step S13, a numerical simulation method may be specifically used to optimize the initial size, and the process may specifically be:

[0054] Establish a three-dimensional model of the initial prefabricated billet according to the initial size; select a numerical simulation model, such as a finite element analysis model, input various mechanical property parameters (elastic modulus, yield strength, etc.) of the material of the prefabricated billet into the numerical simulation model, and determine the simulation conditions (forging process parameters, such as temperature, pressure, speed, etc.); input the three-dimensional model of the initial prefabricated billet into the numerical simulation model to run the numerical simulation, and analyze the simulation results; adjust the initial size according to the simulation results; repeat the simulation and analysis after adjustment, and compare the effects under different sizes; based on multiple simulation results, clarify the specific direction and trend of size optimization; finally, further fine-tune the size parameters to obtain the optimal size of the prefabricated billet.

[0055] It is worth noting that the size of the target forging in this embodiment may include the size of each structural part, such as length, width, thickness and curvature, etc. The parameters included in the size of different target forgings may be different, depending on the actual situation. Figure 2Taking the target forging of the M-type structure shown as an example, the parameters included in the size are specifically introduced.

[0056] The target forging includes a middle portion 1 and two curved structural portions 2. The dimensions of the target forging include the length and width of the middle portion 1, the curvature and wall thickness of the two curved structural portions 2, and the height of the target forging. The dimensions of the corresponding preform also include the length and width of the middle portion of the preform, the curvature and wall thickness of the two curved structural portions of the preform, and the height of the preform.

[0057] After the volume and size of the preform are determined in the above manner, the appropriate specification bar is selected according to the size of the preform. Since the preform is the same as the target forging, the structure of the preform can be known, such as Figure 3 As shown, the prefabricated blank may include at least an intermediate structure portion 400, a first connecting section 500 and a second connecting section 600. The specific process of selecting the bar material according to the size in step S2 is introduced below.

[0058] It should be understood that the wall thickness of a certain curved structure A described in the embodiment of the present application can be understood as that the curved structure A has relative inner and outer walls in its radial direction, the distance from a certain point on the inner wall to the outer wall along the radial direction, or the distance from a certain point on the outer wall to the inner wall along the radial direction.

[0059] The cross-sectional area of ​​the bar is determined according to the maximum cross-sectional area of ​​the intermediate structure part 400, the first connecting section 500 or the second connecting section 600, and the length of the bar is determined according to the volume of the preform and the cross-sectional area of ​​the bar, wherein the cross-sectional area of ​​the bar is larger than the maximum cross-sectional area of ​​the intermediate structure part 400, and the cross-sectional area of ​​the bar may also be larger than twice the maximum cross-sectional area of ​​the first connecting section 500 or the second connecting section 600.

[0060] Specifically, for example, the bar material can be selected according to the maximum cross-sectional area of ​​the intermediate structure 400, then some bar materials are selected according to the maximum cross-sectional area of ​​the intermediate structure 400, and the cross-sectional areas of these bar materials should be larger than the maximum cross-sectional area of ​​the intermediate structure 400, and then the length of the bar materials is calculated according to the cross-sectional area of ​​the bar materials and the volume of the prefabricated blank, and the most suitable bar material can be selected. For another example, the bar material can be selected according to the maximum cross-sectional area of ​​the first connecting section 500, then some bar materials are selected according to twice the maximum cross-sectional area of ​​the first connecting section 500, and the cross-sectional areas of these bar materials should be larger than twice the maximum cross-sectional area of ​​the first connecting section 500, and then the length of the bar materials is calculated according to the cross-sectional area of ​​the bar materials and the volume of the prefabricated blank, and the most suitable bar material can be selected. It is worth noting that if the cross-sectional size calculated here is greater than 400mm, since the upper limit of the bar material related standards is Φ400mm, the bar material size is determined to be Φ400mm×1550mm. If the calculated cross-sectional size is less than 400mm, the bar material is selected according to the actual situation.

[0061] In an exemplary embodiment, the preset temperature is (Tβ-30)°C to (Tβ-70)°C, wherein Tβ is the phase transition point temperature.

[0062] In this embodiment, the temperature of the forging process is a preset temperature, that is, (Tβ-30)°C to (Tβ-70)°C. The appropriate forging temperature is selected according to the phase transition point temperature of different materials.

[0063] After selecting the appropriate specification bar through the above method, start forging the bar. Figure 4 The schematic diagram of the structure of the bar material of the forging method of the titanium alloy open frame forging preform blank of the present application is as follows: the specific process of forging the bar material at a preset temperature to obtain the first slab 100 in step S3 is introduced below.

[0064] Specifically, after the bar is heated to (Tβ-30)°C to (Tβ-70)°C, the bar is placed on a free forging press to form a first slab 100. In this embodiment, the cross-sectional shape of the first slab 100 along the first direction X can be a funnel shape, such as Figure 5 Of course, it can also be a rectangle or other shapes, as long as the prefabricated blank can be obtained, and the specific shape is not limited here.

[0065] Below Figure 5 Taking the first slab 100 as an example, the first slab 100 is cut according to the shape of the target forging in step 4, and the first slab 100 is divided into a preset number of structural parts, which is specifically introduced.

[0066] Step 41, cutting the first slab 100 along the first direction X, forming a first cutting seam 101 on the first slab 100, and obtaining a second slab 200; wherein the first direction X is the length direction of the first slab 100;

[0067] The first cutting seam 101 extends from one end of the first slab 100 to the other end by a preset length, and the preset length is less than the length of the first slab 100;

[0068] In the second direction Y, the parts on both sides of the first cutting seam 101 respectively constitute the first structural part 201 and the second structural part 202 of the second slab 200, and the second direction Y is perpendicular to the first direction X; the remaining part of the second slab 200 constitutes the third structural part 203 of the second slab 200. Figure 6 ; The volume of the first structural portion 201 and the second structural portion 202 is the same, and is twice the volume of the third structural portion 203.

[0069] In this embodiment, the first slab 100 is first cut, and then divided into a first structural portion 201, a second structural portion 202 and a third structural portion 203 according to the volume with the first cutting seam 101 as the boundary, thereby achieving effective distribution of the bar material, reducing material waste in the forging process, and significantly improving material utilization.

[0070] In an exemplary embodiment, the cutting method may be milling, wire cutting, sawing or water cutting, etc. The starting point of the first cutting slit is semicircular, and the radius of the starting point of the first cutting slit is a first preset radius.

[0071] Exemplarily, the first preset radius may be 10 mm to 60 mm.

[0072] In this embodiment, during cutting, the shape of the cutting starting point is made semicircular, the size of the first preset radius is limited, and a smooth transition is made from the cutting starting point to the outside, which can avoid cracks in subsequent forging and improve the quality of the prefabricated blank.

[0073] After the second slab 200 is divided into a preset number of structural parts, forging of the second slab 200 is started. The following is a detailed introduction to the step S5 of forging corresponding structural parts at a preset temperature according to the size of the preform to obtain the preform.

[0074] Step S51: At a preset temperature, the second slab 200 is forged and separated along the first cutting seam 101, so that the first structure portion 201 and the second structure portion 202 form a preset angle, and a third slab 300 is obtained. Figure 7 ;

[0075] Step S52: Under a preset temperature, the third structure portion 203, the first structure portion 201 and the second structure portion 202 are forged and stretched according to the size of the preformed blank to form the intermediate structure portion 400, the first connecting section 500 and the second connecting section 600, respectively. Figure 8 ;

[0076] Step S53: Under a preset temperature, the first connecting section 500 and the second connecting section 600 are bent and formed by a mold to obtain a prefabricated blank. Figure 3 .

[0077] In an exemplary embodiment, the preset angle is greater than or equal to 100°, for example, it may be 100°, 110°, 120°, 130°, 140°, etc.

[0078] In this embodiment, the first structure part 201 and the second structure part 202 are first split and formed along the first cutting seam 101, and then the first structure part 201, the second structure part 202 and the third structure part 203 are respectively stretched, and then the first structure part 201 and the second structure part 202 are bent. By using the cutting and dividing method to accurately distribute the blank in advance, the material utilization rate can be effectively improved, and the special bending mold is used to form, the difficulty of the bending operation is reduced, the dimensional accuracy of the prefabricated blank is improved, and the quality stability of the target forging is improved. In addition, the preset angle is greater than or equal to 100°, which can reduce the difficulty of subsequent stretching operations.

[0079] It is worth noting that the forging separation mentioned in this embodiment can be, for example, splitting the second slab 200 through the first cutting seam 101 to form it.

[0080] Exemplarily, the preset temperature may be (Tβ-40)°C.

[0081] During forging, the second slab or the third slab is first heated to the forging temperature, and the first structural part 201, the second structural part 202 and the third structural part 203 are stretched to the corresponding length according to the dimensions of each structural part obtained in the above embodiment, so as to obtain the intermediate structural part 400, the first connecting section 500 and the second connecting section 600. The thickness of the intermediate structural part 400 may be uneven. For example, a groove is formed on the surface of the intermediate structural part 400. Then, the groove may be formed by first performing a preliminary stretching on the whole, and then performing a separate forging operation on the area where the groove is to be formed. Other methods of obtaining the groove may also be used, which are not limited here. In addition, the bending method in the forging process is specifically introduced below and will not be repeated here.

[0082] Based on the above embodiment, due to the difference of the target forgings, steps S4 and S5 will be different. Fig. 9Taking the target forging shown in FIG. as an example, steps S4 and S5 are further described. After step S41, the method further includes:

[0083] Step S42: At the first cutting seam 101, the first structure portion 201 and the second structure portion 202 are cut along the second direction Y to form a second cutting seam 204 and a third cutting seam 205, respectively. Fig.10 As shown; wherein the lengths of the second cutting slit 204 and the third cutting slit 205 are both smaller than the widths of the first structure part 201 or the second structure part 202; wherein the second cutting slit 204 divides the first structure part 201 into the fourth structure part 206 and the fifth structure part 207 of equal volume, and the third cutting slit 205 divides the second structure part 202 into the sixth structure part 208 and the seventh structure part 209 of equal volume; the fourth structure part 206 is connected between the third structure part 203 and the fifth structure part 207, and the sixth structure part 208 is connected between the third structure part 203 and the seventh structure part 209. The starting ends of the second cutting slit 204 and the third cutting slit 205 are semicircular, and the radius of the starting ends of the second cutting slit 204 and the third cutting slit 205 is the second preset radius, and the first preset radius is greater than the second preset radius.

[0084] Exemplarily, the second preset radius may be smaller than the first preset radius. For example, the first preset radius may be 30 mm, and the second preset radius may be 8 mm.

[0085] Correspondingly, step S5 may include:

[0086] Step S511, at a preset temperature, forging and separating the second slab along the first cutting seam 101, so that the fourth structure portion 206 and the sixth structure portion 208 form a preset angle, and obtaining a third slab 300, see Fig.11 ;

[0087] Step S521, at a preset temperature, forging and stretching the third structure part 203, the fourth structure part 206 and the sixth structure part 208 according to the size of the preformed blank, and correspondingly forming the intermediate structure part 400, the first connecting section 500 and the second connecting section 600;

[0088] Step S531: Under a preset temperature, the fifth structure portion 207 and the seventh structure portion 209 are forged and stretched according to the size of the preformed blank to form a first end portion 700 and a second end portion 800, respectively. Fig.12 , wherein the extension direction of the fifth structure portion 207 and the seventh structure portion 209 is opposite to the extension direction of the intermediate structure portion 400;

[0089] Step S541: Under a preset temperature, the first connecting section 500 and the second connecting section 600 are bent and formed by a mold to obtain a prefabricated blank. Fig.13 .

[0090] In this embodiment, the first structure part 201 and the second structure part 202 are cut to form a second cutting seam 204 and a third cutting seam 205 respectively, and the first structure part 201 and the second structure part 202 are divided into a fourth structure part 206 and a fifth structure part 207, a sixth structure part 208 and a seventh structure part 209 respectively through the second cutting seam 204 and the third cutting seam 205. The second slab 100 is further divided according to the target forging, and splicing by welding is not required, so as to further improve the material utilization rate of the finished forging. The first end 700 and the second end 800 are obtained by drawing from the second cutting seam 204 and the third cutting seam 205, and the dimensional accuracy of the first end 700 and the second end 800 can be guaranteed.

[0091] A second embodiment of a titanium alloy open frame forging preform blank, a forging method thereof, and a mold of the present application provides a titanium alloy open frame forging preform blank, which is obtained by using the forging method of the titanium alloy open frame forging preform blank of the above embodiment.

[0092] The third embodiment of the present application provides a titanium alloy open frame forging preform blank and a forging method and a mold, and provides a mold for preparing the titanium alloy open frame forging preform blank of the above embodiment, such as Fig.14 As shown, the mold includes a first mold 10 and a second mold 20; one end of the first mold 10 has a protrusion 11 adapted to the preform; one end of the second mold 20 has a recessed portion 21 adapted to the shape of the preform, and the protrusion 11 is adapted to the recessed portion 21, and is used to bend the first connecting section 500 or the second connecting section 600 of the preform; wherein the second mold 20 is provided with a groove 22 at one end corresponding to the recessed portion 21, and the second mold 20 accommodates the corresponding structural portion of the preform through the groove 22.

[0093] In an exemplary embodiment, the second mold 20 includes a first component 23, a second component 24 and a third component 25 connected in sequence; one end of the second component 24 is recessed to form a recessed portion 21; the maximum distance between the first mold 10 and the recessed portion 21 is less than or equal to the wall thickness of the first connecting section 500 or the second connecting section 600; the grooves 22 are respectively a first groove 221, a second groove 222 and a third groove 223 at the first component 23, the second component 24 and the third component 25; wherein the depth of the second groove 222 is equal to the wall thickness of the first connecting section 500 or the second connecting section; the width of the groove 222 in the first direction X is equal to the width of the preform in the first direction X, and the first direction X is perpendicular to the depth direction of the groove 22.

[0094] It should be understood that in the embodiment of the present application, the second mold 20 is divided into multiple components based on the structural characteristics of each component of the mold to facilitate the description of the specific structure of the mold. It does not mean that the mold is composed of multiple components physically connected to each other. The multiple components can be an integrally molded structure.

[0095] In this embodiment, the first connecting section 500 and the second connecting section 600 in the above embodiment are bent by a mold, and specifically, the curvature and depth of the concave portion 21 and the curvature of the convex portion 11 of the first mold 10 can be adaptively adjusted so that the first connecting section 500 and the second connecting section 600 reach a predetermined size, which can be a curvature. The use of a special mold for bending improves the dimensional accuracy of the prefabricated blank, reduces the difficulty of the bending operation and the required number of fires, improves the quality consistency of the prefabricated blank, greatly improves the material utilization rate, and significantly reduces the manufacturing cost and difficulty.

[0096] Furthermore, the maximum distance between the first mold 10 and the recessed portion 21 is less than or equal to the wall thickness of the first connecting section 500 or the second connecting section 600, and the wall thickness may be 5 mm, which can ensure that the curvature of the first connecting section 500 reaches the preset curvature. The width of the groove 222 in the first direction X is equal to the width of the preform in the first direction X, which can position the intermediate structure portion 400 and the first end portion 700, and avoid shaking during the bending process, which causes the first connecting section 500 to fail to reach the preset curvature and reduce the quality of the preform.

[0097] It is worth noting that the depths of the first groove 221 and the third groove 223 in this embodiment are not specifically limited, as long as the first connecting section 500 or the second connecting section 600 can be completely accommodated in the second groove 222 during bending. In addition, the maximum distance described in this embodiment refers to the vertical distance from the intersection of the recessed portion 21 and the third component 25 to the side of the first mold 10 close to the third component 25.

[0098] The first connecting section 500 and the second connecting section 600 can be bent respectively by the mold of this embodiment, and the bending methods are the same. Here, the first connecting section 500 is taken as an example to introduce the method of using the mold.

[0099] When using, Fig.14 As shown, the intermediate structure portion 400 is placed in the first groove 221, the first connecting section 500 is placed in the second groove 222 and the third groove 223, the first mold 10 is placed above the first connecting section 500, the first mold 10 is gradually moved downward, and the first connecting section 500 is pressed downward to bend it, and finally the first connecting section 500 is completely located in the second groove 222, and the first end 700 is located in the third groove 223.

[0100] In an exemplary embodiment, the mold can be made of 45#, 42CrMo, 5CrNiMo and other steel materials. The mold also includes a first fixing member 30 and a second fixing member 40, the first fixing member is connected to an end of the first mold 10 away from the protrusion 11; the second fixing member 40 is connected to an end of the second mold 20 away from the recessed portion 21.

[0101] In this embodiment, a first fixing member 30 is provided at one end of the first mold 10 to facilitate clamping the first mold 10 and moving it up and down. A second fixing member 40 is provided at one end of the second mold 20 to fix the second mold 20, thereby ensuring the stability of the second mold 20.

[0102] In order to save time, the first connecting section 500 and the second connecting section 600 can be bent simultaneously by a mold. In the technology of the above embodiment, the first mold 10 includes two, and the second mold 20 also includes a fourth component and a fifth component (not shown in the figure), the fourth component is connected to the side of the first component 23 away from the second component 24, and the structure of the fourth component is the same as the structure of the second component 24; the fifth component is connected to the side of the fourth component away from the first component 23, and the structure of the fifth component is the same as the structure of the third component 25.

[0103] In this embodiment, the second grooves 222 at the fourth component part and the second component part 24 cooperate with the two first dies 10 to simultaneously bend the first connecting section 500 and the second connecting section 600, thereby saving forging time and improving forging efficiency.

[0104] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A forging method for a titanium alloy open frame forging preform, characterized in that: include: Determine the volume and size of the preform according to the volume and size of the target forging; Selecting a bar stock according to the size of the preform; Forging the bar material at a preset temperature to obtain a first slab; Cutting the first slab according to the shape of the target forging to divide the first slab into a preset number of structural parts; Forging the corresponding structural part at the preset temperature according to the size of the preformed blank to obtain the preformed blank; Wherein, determining the volume and size of the preform according to the volume and size of the target forging includes: Determining the volume of the preform according to the volume of the target forging, wherein the volume of the preform is equal to a preset number of times the volume of the target forging; Determining the initial size of the preform according to the volume of the preform and the size and shape of the target forging; Optimizing the initial size to obtain the size of the preform; The prefabricated blank at least comprises an intermediate structure portion, a first connecting section and a second connecting section, and the selecting of the bar material according to the size of the prefabricated blank comprises: Determining the cross-sectional area of ​​the bar material according to the maximum cross-sectional area of ​​the intermediate structure portion, the first connecting section or the second connecting section; Determining the length of the bar according to the volume of the preform and the cross-sectional area of ​​the bar; Wherein, the cross-sectional area of ​​the rod is larger than the maximum cross-sectional area of ​​the intermediate structure portion, or the cross-sectional area of ​​the rod is larger than twice the maximum cross-sectional area of ​​the first connecting segment or the second connecting segment; The preset temperature is (Tβ-30)°C to (Tβ-70)°C, wherein Tβ is the phase transition point temperature.

2. The forging method of the titanium alloy open frame forging preform according to claim 1, characterized in that: The step of cutting the first slab according to the shape of the target forging to divide the first slab into a preset number of structural parts includes: Cutting the first slab along a first direction to form a first cutting seam on the first slab to obtain a second slab; Wherein, the first direction is the length direction of the first slab, the first cutting seam extends from one end of the first slab to the other end by a preset length, and the preset length is less than the length of the first slab; In a second direction, portions on both sides of the first cutting seam respectively constitute a first structural portion and a second structural portion of the second slab, and the second direction is perpendicular to the first direction; The remaining portion of the second slab constitutes a third structural portion of the second slab; The volumes of the first structure portion and the second structure portion are the same and are twice the volume of the third structure portion.

3. The forging method of the titanium alloy open frame forging preform as claimed in claim 2, characterized in that: The forging of the corresponding structural part at the preset temperature according to the size of the prefabricated blank to obtain the prefabricated blank comprises: At the preset temperature, forging and separating the second slab along the first cutting seam so that the first structural portion and the second structural portion form a preset angle, thereby obtaining a third slab; At the preset temperature, the third structure portion, the first structure portion and the second structure portion are forged and stretched according to the size of the preformed blank to form an intermediate structure portion, a first connecting section and a second connecting section respectively; At the preset temperature, the first connecting section and the second connecting section are bent and formed by a mold to obtain the prefabricated blank.

4. The forging method of the titanium alloy open frame forging preform as claimed in claim 2, characterized in that: After the first slab is cut along the first direction to form a first cutting seam on the first slab to obtain a second slab, the method further includes: At the first cutting seam, the first structure part and the second structure part are cut respectively along the second direction to form a second cutting seam and a third cutting seam correspondingly; wherein the length of the second cutting seam and the third cutting seam are both smaller than the width of the first structure part or the second structure part; The second cutting seam divides the first structure part into a fourth structure part and a fifth structure part of equal volume, the third cutting seam divides the second structure part into a sixth structure part and a seventh structure part of equal volume, the fourth structure part is connected between the third structure part and the fifth structure part, and the sixth structure part is connected between the third structure part and the seventh structure part; The starting ends of the first cutting slit, the second cutting slit and the third cutting slit are all semicircular, the radius of the starting end of the first cutting slit is a first preset radius, the radii of the starting ends of the second cutting slit and the third cutting slit are both a second preset radius, and the first preset radius is greater than the second preset radius.

5. The forging method of the titanium alloy open frame forging preform as claimed in claim 4, characterized in that: The forging of the corresponding structural part at the preset temperature according to the size of the prefabricated blank to obtain the prefabricated blank comprises: At the preset temperature, forging and separating the second slab along the first cutting seam so that the fourth structure portion and the sixth structure portion form a preset angle, thereby obtaining a third slab; At the preset temperature, the third structure part, the fourth structure part and the sixth structure part are forged and stretched according to the size of the preformed blank to form an intermediate structure part, a first connecting section and a second connecting section respectively; At the preset temperature, the fifth structure part and the seventh structure part are forged and stretched according to the size of the preformed blank to form a first end and a second end respectively, wherein the stretching direction of the fifth structure part and the seventh structure part is opposite to the stretching direction of the third structure part; At the preset temperature, the first connecting section and the second connecting section are bent and formed by a mold to obtain the prefabricated blank.

6. A titanium alloy open frame forging preform, characterized in that: The forging method of the titanium alloy open frame forging preform is adopted as described in any one of claims 1 to 5.

7. A mold, characterized in that: For preparing the titanium alloy open frame forging preform according to claim 6, the die comprises a first die and a second die; One end of the first mold has a protrusion that matches the shape of the preform; One end of the second mold has a recessed portion that matches the shape of the preform, and the raised portion matches the recessed portion, so as to bend the first connecting section or the second connecting section of the preform into shape; The second mold has a groove at one end corresponding to the recessed portion, and the second mold accommodates the corresponding structural portion of the preform through the groove.

8. The mold according to claim 7, characterized in that: The second mold comprises a first component, a second component and a third component connected in sequence; One end of the second component is recessed to form the recessed portion; The maximum distance between the first mold and the recessed portion is less than or equal to the wall thickness of the first connecting section or the second connecting section; The grooves are respectively a first groove, a second groove and a third groove at the first component part, the second component part and the third component part; Wherein, the depth of the second groove is equal to the wall thickness of the first connecting section or the second connecting section; The width of the groove in a first direction is equal to the width of the preform in the first direction, and the first direction is perpendicular to the depth direction of the groove.

9. The mold according to claim 8, characterized in that: The first mold includes two, and the second mold also includes: a fourth component part connected to a side of the first component part away from the second component part, wherein the structure of the fourth component part is the same as that of the second component part; The fifth component part is connected to a side of the fourth component part away from the first component part, and the structure of the fifth component part is the same as that of the third component part.

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