Forging method of double-eye frame type forge piece

Abstract

The invention provides a forging method of a double-eye frame type forge piece, which comprises the following steps of: 1, designing a forging rough shape: filling a glasses frame, measuring the cross section area An of each forge piece with increased wad, and calculating the theoretical rough shape cross section area Bn according to the An; the minimum radius phi min of the fed bar is calculated, and the final feeding specification phi is selected; 2, a forging tool is designed, a pre-forging die is composed of a pre-forging lower die cavity and an upper die, and the upper die is composed of an equipment standby flat plate die and a blank broadening upper die; 3, verifying the rationality of the design of the rough shape and the pre-forged piece by a computer; fourthly, the forge piece is produced on the basis of the finally determined rough shape of computer analogue simulation; the process design time of the large-scale double-eye integral frame type structure forge piece can be shortened, the forging rough shape of the large-scale double-eye integral frame type structure forge piece can be rapidly obtained, and the requirement for tight delivery joints is met.

Description

Technical Field

[0001] This invention belongs to the field of forging process design, and specifically relates to a forging method for double eyelid forgings. Background Technology

[0002] As aircraft of various models gradually become larger, aircraft components are also becoming increasingly larger. Previously, structural forgings were often divided into several parts, forged separately, and then welded together to form a complete part. The drawback of this method is that the strength and toughness of the welded parts and the weld-affected zone are significantly lower than other parts. To forge large integral frames, various forging companies have invested in giant equipment to meet the requirements of integral forging of aircraft components. This leads to the following problem: For frame-type forgings, segmented forging simplifies the process. For example, a binocular frame, similar in shape to eyeglasses, can be conventionally divided into an X-shaped frame and two C-shaped frames, which can then be forged into a rough shape using free forging methods.

[0003] However, under the requirements of integral forging, the process of frame forgings needs to overcome the following technological challenges: 1. Large variations in the cross-section of the forgings, making rough shape design difficult. 2. Large external dimensions, making it difficult for free forging equipment to complete the complex operations required for rough shape preparation such as reaming and bending.

[0004] Therefore, when faced with large integral frame forgings, how to complete the forming of complex frame forgings using simple processes is an important issue for forging process designers. Summary of the Invention

[0005] Purpose of the invention: To solve the forming problem of integral eye frame forgings, this invention provides a forging method for large integral eye frame forgings, which can be used for large integral eye frame forgings.

[0006] The technical solution is as follows: A forging method for a double eyelid-shaped forging includes: Step 1: Design the forging blank: Fill the eyeglass frame, measure the cross-sectional area An of each section of the forging with added skin, and calculate the theoretical cross-sectional area Bn of the blank based on An; calculate the minimum radius φmin of the feed bar and select the final feed specification φ; calculate the blank dimensions and the length and weight of the production bar. Step 2: Design forging tooling. The pre-forging die consists of a pre-forging lower die cavity and an upper die. The upper die consists of a spare flat die for the equipment and a billet widening upper die. Step 3: Computer simulation to verify the rationality of the rough shape and pre-forging design; Step 4: Produce forgings based on the final rough shape determined by computer simulation.

[0007] Optionally, when filling the eyeglass frame, a 20-30mm thick connecting skin is added inside the eyeglass frame of the integral frame structure forging. When calculating the theoretical rough cross-sectional area Bn, set cross-section A1 from the end of the forging along the length direction, set cross-section A2 at preset distances along the length direction, set cross-section A3 at a preset distance from cross-section A2, and so on, setting A4, A5...An, until the entire forging is covered, and measure the cross-sectional area An; The theoretical rough cross-sectional area Bn = the cross-sectional area An of each forging with added skin × shape factor a, n = 1, 2, 3, 4, 5, 6...; a = 1.05~1.3.

[0008] Optionally, calculate the minimum radius φmin of the feeding bar and select the final feeding specification φ. Specifically, based on the calculated maximum value An, use the area formula An=π(φmin / 2). 2 Calculate the minimum diameter φmin of the feed bar, and match the bar specification φ based on the selected minimum diameter φmin, where φ≥φmin and is closest to φmin.

[0009] Optionally, when calculating the rough shape dimensions, the maximum calculated value of An is used as the benchmark. For adjacent cross-sections with a change of less than 10%, An is simplified according to the large cross-section to obtain the rough shape cross-sectional area Az. The length of the rough shape cross-sectional area Az is based on the length between the cross-sectional dimensions, so the rough shape dimension = rough shape cross-sectional area Az * length between the cross-sectional dimensions.

[0010] Optionally, bar weight = rough weight = rough material density * rough volume, where the rough volume is obtained based on the rough dimensions; The length of the production bar is calculated based on the weight of the rough shape and the specification φ of the production bar.

[0011] Optionally, when designing the pre-forging die, first extract the outer contour line of the forging and use it as the shape of the pre-forging. Calculate the height of the pre-forging using the equal cross-sectional area method. The calculation formula is: pre-forging height = maximum cross-sectional area of ​​the rough shape Az ÷ maximum width of the forging. Use the designed pre-forging as the cavity of the pre-forging die, and design the pre-forging die accordingly.

[0012] Optionally, when designing the billet widening upper die, the outer shapes of the two eyeglass frame inner holes are extracted and simplified into the outer shape line of the billet widening upper die for easy processing and measurement. The outer shape line is 5-10mm larger than the outer shape of the eyeglass frame inner holes. The outer shape line is used as the outer shape line of the working part of the billet widening upper die. The height of the working part of the widening upper die is consistent with the height of the pre-forged part cavity, and the distance of the working part of the widening upper die is equal to the distance of the inner holes of the forged eyeglass frame. After the working part of the upper mold is widened, a connecting part between the upper mold and the equipment is added. The length and width of the connecting part between the upper mold and the equipment are the same as those of the lower mold, and the height is 200. The working part of the upper mold is set on the center line of the mold connecting part with the equipment.

[0013] Optionally, the third step is as follows: First, import the rough shape model, pre-forging die, and spare flat die model into the simulation software. Based on the forging material settings, when the simulated tonnage reaches the maximum pressure of the equipment, change the upper flat die to the billet widening upper die to widen the material storage area at the lens. Then, continue to verify the simulated pre-forging part in the final forging die model. Adjust the shape coefficient 'a' according to the forming results, repeating this process multiple times until a suitable rough shape is obtained, until the final forging part is successfully formed. The simulation parameters include: forging temperature, equipment type, friction coefficient, thermal conductivity coefficient, pressing speed, die temperature, and heat transfer surface of the forging and die.

[0014] Optionally, in the fourth step, the forging process is determined based on the forging process parameters simulated by computer. The process flow is as follows: forging blank → pre-forging → final forging → heat treatment → physical and chemical treatment → final inspection and warehousing; forgings are produced according to the forging process flow.

[0015] The beneficial effects are: This invention designs a forging blank: filling the eyeglass frame, measuring the cross-sectional area An of each section of the forging with added skin, and calculating the theoretical blank cross-sectional area Bn based on An; calculating the minimum radius φmin of the feed bar and selecting the final feed specification φ; calculating the blank dimensions and the length and weight of the production bar; designing forging tooling, the pre-forging die consists of a pre-forging lower mold cavity and an upper die, the upper die consisting of a spare flat die and a billet widening upper die; computer simulation verifies the rationality of the blank and pre-forging design; producing forgings based on the blank finally determined by computer simulation; this can shorten the process design time for large-sized integral eyeglass frame forgings, quickly obtain the forging blank of large-sized integral eyeglass frame forgings, and meet the needs of tight delivery deadlines. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a large, integral eyeglass frame forging. Figure 2 This is a schematic diagram of a large, integral forged eyeglass frame with an inner skin panel. Figure 3 This is a schematic diagram of cross-sections set every 100mm starting from the plane of symmetry; Figure 4 This is a schematic diagram of the dimensions of half of the rough cross-section; Figure 5 This is a schematic diagram of the extracted forging outline; Figure 6 This is a schematic diagram of the pre-forged part; Figure 7 This is a schematic diagram of the pre-forging lower die; Figure 8 This is a schematic diagram of a flat panel mold; Figure 9 This is a schematic diagram of the inner hole of the eyeglass frame and the outer shape of the working part of the expanded upper mold; Figure 10 This is a schematic diagram of the expanded upper mold; Figure 11 This is a schematic diagram of the model imported into the Deform computer simulation software; Figure 12 This is a schematic diagram of the simulation results of flat die forging; Figure 13 This is a schematic diagram of the model after importing the pre-forging and widening upper die; Figure 14 This is a schematic diagram of the simulation results of pre-forging and widening upper die forging. Figure 15 This is the simulation result of the final forging pressure. Detailed Implementation

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

[0018] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0019] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited from each other.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] This invention provides a forging method for a large, integral double-eye frame-like structure forging, comprising: Step 1: Design and forge the rough shape 1.1 Fill in the eyeglass frame Add a 20-30mm thick connecting skin 1 to the inside of the eyeglass frame of the integral frame-like forging.

[0022] 1.2 The cross-sectional area An of each part of the forging with added skin 1 was measured, and the theoretical rough cross-sectional area Bn was calculated based on An.

[0023] Set section A1 from end 1 along the length of the forging, set section A2 every 100mm along the length, set section A3 100mm away from section A2, and so on, setting A4, A5...An, until the entire forging is covered. Use 3D modeling software (CATIA or UG, etc.) to measure the cross-sectional area An.

[0024] The theoretical rough cross-sectional area Bn = the cross-sectional area An of each part of the forging with added skin 1 × shape factor a. In the formula: n = 1, 2, 3, 4, 5, 6...; a = 1.05~1.3.

[0025] The principle for selecting the shape factor 'a' is as follows: for cross-sections with complex shapes, select a larger value for 'a'; for cross-sections with simple shapes, select a smaller value for 'a'.

[0026] 1.3 Calculate the minimum radius φmin of the feed bar and select the final feed specification φ. Based on the maximum value of An calculated in step 1.2, the minimum diameter φmin of the feeding bar is converted using the area formula An=π(φmin / 2)2. Then, the bar specification φ is matched according to the selected minimum diameter φmin. The matching principle is that φ≥φmin and is closest to φmin.

[0027] 1.4 Calculate the dimensions of the rough shape Using the maximum value of An calculated in step 1.2 as a benchmark, An with adjacent cross-section changes within 10% is simplified according to the large cross-section to obtain the rough cross-sectional area Az. The length of the rough cross-sectional area Az is based on the length between cross-sectional dimension changes, thus obtaining the rough dimension = rough cross-sectional area Az * length between cross-sectional dimension changes.

[0028] 1.5 Calculate the length and weight of the bar stock for production. Bar stock weight = Raw material weight = Raw material density * Raw material volume. The raw material volume is derived from the raw material dimensions. The length of the raw material to be produced is calculated based on the raw material weight and the bar stock specification φ.

[0029] Step 2: Designing forging fixtures The pre-forging die consists of a lower pre-forging mold cavity and an upper die. The upper die consists of a spare flat die and a billet widening upper die.

[0030] 2.1 Design of the pre-forging die First, extract the outer contour line 2 of the forging, which will serve as the shape of the pre-forging.

[0031] Secondly, the height of the pre-forging is calculated using the equal cross-sectional area method. The calculation formula is: Pre-forging height = Maximum cross-sectional area of ​​the rough shape Az ÷ Maximum width of the forging.

[0032] The designed pre-forging part is used as the cavity of the pre-forging lower die, and the pre-forging lower die is designed based on this.

[0033] 2.2 Design of the upper die for billet widening Extract the two inner hole shapes 3 of the eyeglass frame and simplify them into the blank widening upper die outline 4, which is easier to process and measure. The outline 4 is 5-10mm larger than the inner hole shape 3 of the eyeglass frame. The outline 4 serves as the outline of the working part 5 of the blank widening upper die. The height of the working part 5 of the widening upper die is consistent with the height of the pre-forged part cavity, and the distance of the working part of the widening upper die is equal to the distance of the inner hole of the forged eyeglass frame.

[0034] A widening die connection part 6 is added after the working part of the upper die. The length and width of the widening upper die connection part 6 are the same as those of the lower die, and the height is 200. The working part of the widening upper die is set on the center line 7 of the die connected to the equipment part 5.

[0035] Step 3: Computer simulation to verify the rationality of the rough shape and pre-forging design. The design of the rough shape model and pre-forging die model is verified for rationality using computer simulation software such as deform or FORGE. The shape coefficient a in step 1.2 is adjusted according to the forming results.

[0036] The specific method is as follows: First, import the rough shape model, pre-forging die, and spare flat die model into the simulation software. Set the simulation parameters according to the forging material (including: forging temperature, equipment type, friction coefficient, thermal conductivity, pressing speed, die temperature, heat transfer surface of forging and die, etc.). When the simulated tonnage reaches the maximum pressure of the equipment, change the upper flat die to the billet widening upper die in step 2.2 to widen the material storage area at the lens. Then, continue to verify the simulated pre-forging part in the final forging die model. Adjust the shape coefficient 'a' in step 1.2 according to the forming results, repeating this process multiple times until a suitable rough shape is obtained, until the final forging part is successfully formed.

[0037] Step 4: Produce forgings according to the final rough shape determined by computer simulation. The forging process is determined based on the forging process parameters in the computer simulation. The process flow is as follows: rough forging → pre-forging → final forging → heat treatment → physical and chemical treatment → final inspection and warehousing. Forgings are produced according to the forging process flow.

[0038] For example, see the structure of a large, integral double-eye frame forging. Figure 1 The top image shows the upper die for the forging, and the bottom image shows the lower die for the forging. The forging material is TC4, the outer dimensions are 4630mm×1580mm×230mm, the forging weight is 1600kg, the projected area is 4.2m2, the cross-sectional change ratio is 1:5, and the geometric distance of the eyeglass frame is 1420mm.

[0039] This forging has a symmetrical structure. It has large external dimensions, a large projected area, a large weight, and a complex shape.

[0040] Step 1: Design and forge the rough shape 1.1 Fill in the eyeglass frame A 25mm thick connecting layer 1 is added inside the eyeglass frame of the forged monolithic frame structure. The structure of the forged part after adding the connecting layer is shown below. Figure 2 .

[0041] 1.2 The cross-sectional area An of each part of the forging with added skin 1 was measured, and the theoretical rough cross-sectional area Bn was calculated based on An.

[0042] This example forging is a symmetrical piece. Half of the forging is selected for analysis, with the symmetrical plane designated as section A1. Sections are then set every 100mm along the length of the forging as section A2, and so on, up to A23. The section selection is detailed in [reference needed]. Figure 3 .

[0043] The measurement results of the cross-sectional area An, the selection results of the shape factor a, and the calculation results of the theoretical rough cross-sectional area Bn are shown in Table 1. For cross-sections A5-A11, due to the large variation in cross-sectional height, a large value of the shape factor a is selected; for the other cross-sections with small variations in height, a small value of the shape factor a is selected.

[0044] Table 1. Cross-sectional areas of half of the theoretical rough shape

[0045] 1.3 Calculate the minimum diameter φmin of the feed bar and select the final feed specification φ. The maximum value of An calculated in step 1.2 is 0.12m. 2 Using the area formula An=π(φmin / 2) 2 The minimum radius of the feed bar is calculated to be φmin = 0.39m = 390mm. The specification closest to φmin and φ ≥ φmin is φ400mm. Therefore, the feed specification φ = φ400mm is selected.

[0046] 1.4 Calculate the dimensions of the rough shape The maximum value of An calculated in step 1.2 is 0.12m. 2 Based on this, for adjacent cross-sections with a variation of less than 10%, An is simplified according to the large cross-section method to obtain the theoretical rough cross-sectional area Az. The simplification results are shown in Table 1.

[0047] The length of the rough cross-sectional area Az is based on the length between changes in cross-sectional dimensions, thus obtaining the rough dimension. Rough dimension = Rough cross-sectional area Az * Length between changes in cross-sectional dimensions.

[0048] The cross-sectional area Az of the rough sections from section 1 to section 13 is 0.12m². 2 Sections 13 to 18 range from 0.12m 2 Transition to 0.06m 2 The cross-sectional area from section 18 to section 23 is 0.06 m². 2 0.06m 2 The cross-section maintains a length of 500mm, 0.12m. 2 The section length is 1200mm, and the transition section length is 500mm.

[0049] The final rough shape diagram of half of the symmetrical forging is obtained, see Figure 4 The weight of the rough shape = the density of the rough material * the volume of the rough shape. The weight of half a forging is 1012 kg.

[0050] 1.5 Calculate the length and weight of the bar stock The weight of half a forging is 1012 kg, and the weight of the entire forging is 2024 kg. The density of TC4 titanium alloy is 4450 kg / m³. 3 The bar stock specification is φ400mm, and the final calculated bar stock length is 3620mm.

[0051] The bar stock specifications are: φ400mm×3620mm.

[0052] Step 2: Designing forging fixtures The pre-forging die consists of a lower pre-forging mold cavity and an upper die. The upper die consists of a spare flat die and a billet widening upper die.

[0053] 2.1 Design of the pre-forging die First, extract the outer contour line 2 of the forging; this will serve as the shape of the pre-forging. See... Figure 5 .

[0054] Secondly, the height of the pre-forged part is calculated using the equal cross-sectional area method.

[0055] Pre-forging height = Maximum cross-sectional area of ​​the rough shape Az ÷ Maximum width of the forging =0.12m2 ÷1580mm=76mm, The shape of the pre-forged part is obtained, see... Figure 6 .by Figure 6 The pre-forged part shown is used as the lower mold cavity. The designed pre-forging lower mold is shown below. Figure 7 The pre-forging upper die is a flat die, see... Figure 8 .

[0056] 2.2 Design of the upper die for billet widening Extract the two inner hole outlines 3 of the eyeglass frames and simplify them into a blank expansion mold outline 4 for easier processing and measurement. Outline 4 should be 10mm larger than the inner hole outline 3 of the eyeglass frames. See... Figure 9 .

[0057] Outline 4 serves as the outline of the upper die working section 5 for billet spreading. The height of the upper die working section 5 is consistent with the height of the pre-forged part cavity, selected as 76. The distance of the upper die working section is equal to the distance of the inner hole of the forged eyeglass frame, both being 1420.

[0058] A widening die connection part 6 is added after the working part of the upper die. The length and width of the widening upper die connection part 6 are the same as those of the lower die, and the height is 200. The working part of the widening upper die is set on the center line 7 of the die connected to the equipment part 5.

[0059] The completed expansion mold design is shown. Figure 10 .

[0060] Step 3: Computer simulation verification The designed rough model ( Figure 7 ), pre-forging die model ( Figure 8 , Figure 10 The results were verified using Deform computer simulation software.

[0061] Import the model into the deform computer simulation software, see Figure 11 .

[0062] The simulated boundary conditions are set as shown in Table 2: Table 2 Simulation boundary conditions

[0063] Simulation results of flat die forging are shown below Figure 12 .

[0064] Expand the blank, place the upper die on the blank, and continue pressing. Figure 13 The model is used to import the pre-forging and widening upper die.

[0065] Figure 14 The model is forged by pre-forging and widening the upper die.

[0066] The preformed part was placed in the final forging cavity and verified using computer simulation software. The simulation parameters are the same as in Table 2, and the results are shown in Table 2. Figure 15 .

[0067] from Figure 15 It can be seen that the forging is well formed and there is no need to repeat the roughing design.

[0068] Step 4: Produce forgings according to the final rough shape determined by computer simulation. The forging process is determined based on the forging process parameters in the computer simulation. The process flow is as follows: rough forging → pre-forging → final forging → heat treatment → physical and chemical treatment → final inspection and warehousing.

[0069] At this point, the forging process design for the large, integral double-eye frame-like structural forging was completed. The forging was then produced according to the forging process flow.

[0070] The above description merely illustrates embodiments of the present invention and is quite specific and detailed; however, it should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Furthermore, any parts of the present invention not described in detail are conventional techniques.

Claims

1. A method of forging a double eye frame forging, characterized by, It comprises: First step: design forging rough shape: fill in the eyeglass frame, measure the increase of the skin of the forging cross-sectional area An, and calculate the theoretical rough shape cross-sectional area Bn according to An; Calculate the minimum radius φmin of the feeding bar, and select the final feeding specification φ; Calculate the rough shape size and the length and weight of the feeding bar; Second step: design forging tooling, the preforming die is composed of a preforming lower die cavity and an upper die, and the upper die is composed of a spare flat die of the equipment and a blank spreading upper die; Third step: verify the rationality of the rough shape and the preformed part design through the computer; Fourth step: finally determine the rough shape to produce the forged part through computer simulation.

2. The method according to claim 1, characterized in that, When filling in the eyeglass frame, 20-30mm thick skin is added in the eyeglass frame of the whole frame structure forging of both eyes; When calculating the theoretical rough shape cross-sectional area Bn, cross section A1 is set at the end of the forging length direction, cross section A2 is set at a preset distance along the length direction, cross section A3 is set at a preset distance from cross section A2, and so on, A4, A5... An are set, until the whole forging is covered, and the cross-sectional area An is measured; Theoretical rough shape cross-sectional area Bn = each cross-sectional area An of the forging with added skin × shape coefficient a, n = 1, 2, 3, 4, 5, 6...; a = 1.05-1.

3.

3. The method of claim 2, wherein, The minimum radius φmin of the feeding bar stock is calculated, and the final feeding gauge φ is selected, specifically: according to the calculated An maximum value, the area formula An=π(φmin / 2) 2 The minimum diameter φmin of the feeding bar stock is converted, and according to the selected minimum diameter φmin, the bar stock gauge φ is matched, φ≥φmin, and closest to φmin.

4. The method of claim 3, wherein, When calculating the rough shape size, take the maximum An calculated as the reference, simplify An according to the large cross section when the change of adjacent cross section is within 10%, get the rough shape cross-sectional area Az, and the length of the rough shape cross-sectional area Az is accurate to the length between cross-sectional size changes, so the rough shape size = rough shape cross-sectional area Az * length between cross-sectional size changes.

5. The method of claim 3, wherein, Bar weight = rough shape weight = rough shape material density * rough shape volume, which is obtained based on the rough shape size; Based on the rough shape weight and the feeding bar specification φ, the length of the feeding bar is calculated.

6. The method of claim 1, wherein, When designing the preforming lower die, first extract the outer contour line of the forging, which is taken as the outer shape of the preformed part, calculate the height of the preformed part by using the equal cross-sectional area method, the formula is: preformed part height = rough shape maximum cross-sectional area Az ÷ maximum width of the forging; take the designed preformed part as the cavity of the preforming lower die, and design the preforming lower die accordingly.

7. The method of claim 1, wherein, When designing the blank spreading upper die, extract the outer shape of the two eyeglass frame inner holes, simplify it into the blank spreading upper die outer shape line which is convenient for processing and measuring, and the outer shape line is 5-10mm larger than the outer shape of the eyeglass frame inner hole; take the outer shape line as the outer shape line of the blank spreading upper die working part, the height of the blank spreading upper die working part is consistent with the cavity height of the preformed part, and the distance of the blank spreading upper die working part is equal to the distance of the eyeglass frame inner hole; Increase the spreading die and equipment connection part behind the spreading upper die working part, the spreading upper die and equipment connection part is consistent with the length and width of the lower die, and the height is 200, the spreading upper die working part is set on the die center line of the equipment connection part.

8. The method of claim 1, wherein, The third step is specifically: Firstly, the rough shape model, pre-forging lower die, and equipment standby flat die model are imported into the simulation software. According to the material setting of the forging, when the simulation tonnage reaches the maximum pressure of the equipment, the upper flat die is changed to the blank spreading upper die to spread the stock at the spectacle lens position. Then, the pre-forging obtained by simulation is continuously verified in the final forging die model. According to the forming result, the shape coefficient a is adjusted repeatedly until the appropriate rough shape is obtained, and the final forging is successfully formed. The simulation parameters include: forging temperature, equipment type, friction coefficient, thermal conductivity coefficient, pressing speed, die temperature, forging and die heat transfer surface.

9. The method of claim 1, wherein, In the fourth step, the forging process is determined based on the computer simulation forging process parameters, and the process flow is: rough forging → pre-forging → final forging → heat treatment → physical and chemical → final inspection and warehousing; the forgings are produced according to the forging process flow.

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