Special-shaped window forging net-near forming tooling and forming process

Abstract

The invention relates to the field of forging processing, and discloses a near-net forming tool and a forming process for forging a special-shaped window. By making a special tool, the near-net forming processing is performed on the special-shaped window parts, which solves the problem that the special-shaped window parts in the prior art are formed by mechanical processing of straight cylindrical forging blanks, which has the problems of long processing time and large material waste.

Description

Technical Field

[0001] The invention relates to the field of forging processing, and in particular to a near-net forming tool and a forming process for forging a special-shaped window. Background Art

[0002] There is a special-shaped window part in the rocket launcher compartment, which is an important protective compartment of the rocket launcher. Its maximum outer diameter is Φ489, the minimum inner diameter is Φ385, the height is 230, and the minimum wall thickness is 3mm. The special-shaped window part 1 was originally processed from 0Cr18Ni10Ti cylinder forgings to form a straight cylindrical blank, and then machined. Figure 1 As shown, the eight weight-reducing windows 102 of two different sizes symmetrically distributed on the inner side need to be processed by a special T-type milling cutter, using the following method: Figure 2 The straight forging blank shown in the figure needs to go through the processes of flat end face, rough turning, milling ear, drilling, fine turning, milling flat rib, milling waist groove, milling eight weight-reducing windows 102, bench repairing eight weight-reducing windows 102, polishing, cleaning and packaging after the straight forging blank is completed. In particular, the milling and shaping process of the eight weight-reducing windows 102 takes a particularly long time. After each blank is put on the machine tool, the entire mechanical processing process needs to be continuously processed for 15 days to complete. The processing efficiency is low, which greatly restricts the production progress of special-shaped windows. In addition, this processing method requires a large amount of raw materials as a whole, and a large amount of materials are removed in the subsequent processing of the straight forging blank, resulting in a large amount of raw material waste. In addition, because it is first forged into a straight cylinder shape, the metal streamlines inside the blank are all in the direction of the straight cylinder axis. During the mechanical processing, the metal streamlines at the root of the ear 101 formed by milling are cut off, resulting in low load-bearing strength, which makes the parts have safety hazards during the hoisting process. Summary of the invention

[0003] The present invention aims to provide a near-net-forming tool for forging special-shaped windows, so as to solve the problem in the prior art that the special-shaped window parts are formed by mechanical processing using straight cylindrical forging blanks, which has the problems of long processing time and great material waste.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a tooling for forging a special-shaped window for net near-forming, including a core rod, a forming section in the middle of the core rod, the upper end face and the lower end face of the forming section are both arc surfaces, a No. 1 stamp is provided in the middle of the upper end face, and a No. 2 stamp is provided in the middle of the lower end face, the No. 1 stamp and the No. 2 stamp are used for forging and net near-forming eight weight-reducing windows of two different sizes on the inner side of the special-shaped window part, a supporting mechanism is provided below both ends of the core rod, and a driving mechanism for driving the core rod to rotate is provided on the outside of the supporting mechanism.

[0005] Preferably, as an improvement, a limiting platform is provided on the left side of the forming section, and a positioning platform is provided on the right side of the forming section.

[0006] Preferably, as an improvement, both the left and right ends of the core rod are square support sections, the support mechanism includes a left flat anvil and a right flat anvil, and the support sections at both ends of the core rod are supported and placed by the left flat anvil and the right flat anvil.

[0007] Preferably, as an improvement, the driving mechanism is a V-type clamp operator arranged on the right side of the right flat anvil, the V-type clamp operator is provided with a V-type clamp for clamping the right end of the mandrel, the V-type clamp operator can clamp the mandrel through the V-type clamp and drive the mandrel to rotate; a flat-nose clamp operator is provided on the left side of the left flat anvil, the flat-nose clamp operator clamps the forging blank through the flat-nose clamp and rotates.

[0008] Preferably, as an improvement, an upper anvil is provided above the core rod forming section, and a lower anvil is provided below the core rod forming section, and a semicircular cavity is provided on both the upper anvil and the lower anvil.

[0009] The principle and advantages of this scheme are: after heating the prepared rolled ring blank, put it on the mandrel, position it by the positioning table and the limit table, and place the mandrel on the left flat anvil and the right flat anvil. The upper anvil is installed on the press, and the press outputs the forming force to forge the rolled ring blank downward through the upper anvil. After the rolled ring blank is compacted, the No. 1 or No. 2 stamp on the mandrel is embedded in the rolled ring blank to form a forging weight reduction window, and then the V-type clamp operator clamps the mandrel and rotates clockwise, and the flat-nose clamp operator clamps the forging blank and rotates counterclockwise, and the position of the rolled ring blank and the mandrel is adjusted to forge other weight reduction windows. In this way, the net forming of the forging of the special-shaped window parts is completed through the functions of the positioning table, the limit table, the No. 1 stamp and the No. 2 stamp. The structural features with outer dimensions close to the dimensions of the parts are formed on the forging by forging. The outer shape of the forging is close to the parts, which can reduce the machining allowance after forging and the amount of material removed during the machining process. Therefore, the machining time can be reduced under the same conditions, which can effectively improve the problems of large material waste and long processing time in the prior art of using straight tube forgings for machining parts.

[0010] The present invention also provides a special-shaped window forging net near-forming process, comprising the following steps:

[0011] A. Tooling production, processing and manufacturing of the net-near forming tooling for forging special-shaped windows as claimed in claim 5;

[0012] B. Billet preparation: heating the raw materials and forging them into cylindrical billets;

[0013] C. Net near forming: put the blank into the forming section of the mandrel, use the press to drive the upper anvil to forge the blank, so that the No. 1 or No. 2 stamping on the mandrel is embedded in the blank to form a forging weight reduction window, use the V-type clamp operator to clamp the mandrel and rotate it clockwise, and use the flat-nose clamp operator to clamp the blank and rotate it counterclockwise, adjust the position of the blank and the mandrel to forge and form eight weight reduction windows.

[0014] Preferably, as an improvement, after completing step C, the formed forging is subjected to a solution treatment, wherein the solution treatment is to keep the forging at 1020-1080° C. for 100-150 min and then water-cool it.

[0015] Preferably, as an improvement, in step A, the core rod axis is controlled to be in the same straight line, and when the core rod forming section is produced, 1% of heat shrinkage is added to the size of the special-shaped window forging, so that the forming section is consistent with the shape and size of the weight loss window after the forging is cooled.

[0016] Preferably, as an improvement, the heating in step B is to heat the blank to 1150-1180° C. in an electric furnace and keep the temperature at 0.4-0.6 min / mm for 80-120 min.

[0017] Preferably, as an improvement, in step B, the blank is first heated and then forged into a straight cylindrical shape, and then heated again under the same heating parameters and rolled into a rolled ring blank in the shape of a cylinder with an inner flange.

[0018] In this scheme, during the forging process, the positioning table, the limit table, the No. 1 stamping, and the No. 2 stamping of the core rod work together to complete the net near forging of the weight-reduced window of the special-shaped window part, which greatly reduces the machining allowance, saves material costs, and greatly reduces the processing cycle. The existing technology requires 15 days to complete the single-piece processing, while this scheme only needs 6 days to complete the single-piece processing, which improves the processing efficiency. The heating quality of the forging is guaranteed by standardizing the heating parameters, and the heat treatment specifications ensure that the physical and chemical measured parameters are better than the standard requirements for the detection parameters. In addition, such net near-forming processing can ensure that the metal flows evenly and smoothly, and that there are no forging defects such as folding, rib penetration, and cracks inside the forging. The metal streamlines at the root of the formed forging ear are continuous, and the bearing strength is higher than that of the straight tube forging blank forming in the existing technology, and there are no safety hazards in the ear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of special-shaped window parts.

[0020] Figure 2 It is a longitudinal section view of a straight tube forging according to the prior art.

[0021] Figure 3 This is a schematic diagram of the structure of Example 1 of the present invention.

[0022] Figure 4 This is a schematic structural diagram of the core rod in Example 1 of the present invention.

[0023] Figure 5 This is a schematic diagram of a flat-nose pliers clamping a forging blank in Example 1 of the present invention.

[0024] Figure 6 This is a schematic diagram of the V-type clamps clamping the mandrel in Example 1 of the present invention.

[0025] Figure 7 This is a schematic diagram of the upper anvil and the lower anvil trimming the forging blank in Example 1 of the present invention.

[0026] Figure 8 It is a cross-sectional view of the forging blank in Example 2 of the present invention.

[0027] Fig. 9 It is a cross-sectional view of the rolled ring blank in Example 2 of the present invention.

[0028] Fig.10 It is a schematic diagram of the first step of net near forming in Example 2 of the present invention.

[0029] Fig.11 It is a schematic diagram of the second step of net near forming in Example 2 of the present invention.

[0030] Fig.12 It is a schematic diagram of the third step of net near forming in Example 2 of the present invention.

[0031] Fig.13 It is a schematic diagram of the fourth step of net near forming in Example 2 of the present invention.

[0032] Fig.14 It is a schematic diagram of the fifth step of net near forming in Example 2 of the present invention.

[0033] Fig.15 It is a schematic diagram of the sixth step of net near forming in Example 2 of the present invention.

[0034] Fig.16 It is a schematic diagram of the seventh step of net near forming in Example 2 of the present invention.

[0035] Fig.17 This is a schematic diagram of the state of trimming in Example 2 of the present invention.

[0036] Fig.18 The present invention provides a metal streamline diagram of the root of the ear of a special-shaped window part processed by the prior art.

[0037] Fig.19 This is a metal streamline diagram of the root of the ear of a special-shaped window part processed in Example 2 of the present invention. DETAILED DESCRIPTION

[0038] The following is further described in detail through specific implementation methods:

[0039] The figure marks in the drawings of the specification include: special-shaped window part 1, lifting ear 101, weight reduction window 102, rolled blank 2, core rod 3, support section 301, limit table 302, positioning table 303, left flat anvil 304, right flat anvil 305, flat-nose pliers operating machine 306, flat-nose pliers 3061, V-shaped pliers operating machine 307, V-shaped pliers 3071, upper anvil 308, forming section 309, No. 1 stamp 310, No. 2 stamp 311, lower anvil 312.

[0040] Embodiment 1, basically as attached Figure 3 As shown: the net near-forming tooling for forging special-shaped windows includes a core rod 3, both ends of the core rod 3 are square support sections 301, the middle part of the core rod 3 is a forming section 309, and the Figure 4 As shown, the upper and lower end surfaces of the forming section 309 are both arc surfaces, a No. 1 stamp 310 is provided in the middle of the upper end surface, and a No. 2 stamp 311 is provided in the middle of the lower end surface. The No. 1 stamp 310 and the No. 2 stamp 311 are used to forge and nearly form eight weight-reducing windows of two different sizes on the inner side of the special-shaped window parts. A limiting platform 302 is provided between the forming section 309 and the left support section 301, and a positioning platform 303 is provided between the forming section 309 and the right support section 301. The positioning platform 303 is used to position the forging blank of the special-shaped window parts, and the limiting platform 302 is used to limit the forging blank of the special-shaped window parts, so that the forging blank is accurately and stably positioned on the core rod 3, so as to facilitate the forging and nearly forming of the weight-reducing windows. The support sections 301 at both ends of the mandrel 3 are supported by the left flat anvil 304 and the right flat anvil 305. The left flat anvil 304 and the right flat anvil 305 cooperate with the square support ends to provide stable and reliable support for the mandrel 3 and prevent the mandrel 3 from rotating automatically during the forging process. Figure 5 As shown, the flat-nose clamp manipulator 306 clamps the forging blank through the flat-nose clamp 3061, so as to rotate the forging blank to different postures to cooperate with the mandrel 3 to perform the weight-reducing window forging process. Figure 6 As shown, the V-type clamp operating machine 307 clamps the right end of the core rod 3 through the V-type clamp 3071, so as to rotate the core rod 3 to different postures to cooperate with the forging blank to forge the weight-reducing window. An upper anvil 308 is provided above the forming section 309 of the core rod 3, and a circular arc cavity is provided at the bottom of the upper anvil 308. During the forging process, the upper anvil 308 is driven by a press. In this embodiment, the press uses an 800T fast forging machine. The upper anvil 308 cooperates with the forming section 309 of the core rod 3 to forge the forging blank to forge the weight-reducing window. After the forging process is completed, the forging is placed on a lower anvil 312. The upper end of the lower anvil 312 is provided with a circular arc cavity, combined with Figure 7As shown, the upper anvil 308 is driven by a press machine to cooperate with the lower anvil 312 to trim and round the shape of the forging blank to ensure uniform machining allowance of the shape, so that the blank can be processed into a part based on the outer circle.

[0041] The specific implementation process is as follows: the prepared rolled ring blank is heated and then sleeved on the mandrel 3, and positioned by the positioning table 303 and the limiting table 302, and the mandrel 3 is placed on the left flat anvil 304 and the right flat anvil 305. The upper anvil 308 is installed on the 800T fast forging machine, and the 800T fast forging machine outputs the forming force to forge the rolled ring blank downward through the upper anvil 308. After the rolled ring blank is compacted, the No. 1 stamp 310 or No. 2 stamp 311 on the mandrel 3 is embedded in the rolled ring blank to form a forging weight reduction window, and then the V-type clamp operating machine 307 clamps the mandrel 3 and rotates clockwise, and the flat-nose clamp operating machine 306 clamps the forging blank and rotates counterclockwise, and the positions of the rolled ring blank and the mandrel 3 are adjusted to forge and form other weight reduction windows.

[0042] Example 2, a near-net forming process for forging special-shaped windows, including tooling design and manufacturing, blank preparation, and near-net forming.

[0043] The tooling is designed and manufactured to process and manufacture the net near-forming tooling for the special-shaped window forging of Example 1. The axis line of the core rod 3 is controlled to be on the same straight line. When the forming section 309 of the core rod 3 is manufactured, 1% of the heat shrinkage is added on the basis of the size of the special-shaped window forging, so that the forming section 309 is consistent with the shape and size of the weight-reducing window after the forging is cooled.

[0044] Billet preparation: 0Cr18Ni10Ti material is purchased according to GB / T1220-2007 standard, and put into production after re-inspection. Cut the material Φ200×410, weigh 201kg, chamfer the R5 angle and remove the surface defects of the bar. Heat the billet to 1150~1180℃ in an electric furnace, and keep it warm for 80~120min at 0.4~0.6min / mm. After the billet reaches the holding time, take it out of the electric furnace, and forge, punch and expand it on the 800T fast forging machine as follows: Figure 8 The forging blank is shown in the figure. After removing the surface defects of the forging blank, reheat it and heat it in an electric furnace to 1150-1180℃, and keep it warm for 80-120min at 0.4-0.6min / mm. Then process it on the D51-500E ring rolling machine as shown below. Fig. 9 The shown rolled ring blank is in the shape of a cylinder with an inner flange.

[0045] Net nearly forming, as follows:

[0046] In the first step, the V-type clamp operating machine 307 clamps the right end of the mandrel 3, heats the prepared ring blank and puts it on the mandrel 3, and uses the positioning table 303 to provide a positioning reference, and uses the limit table 302 to limit the position and prevent it from falling off, and the mandrel 3 is placed on the left flat anvil 304 and the right flat anvil 305, combined with Fig.10As shown, the forming force of the 800T fast forging machine forges the rolled ring blank downward through the upper anvil 308. After compacting the rolled ring blank, the No. 1 stamp 310 on the mandrel 3 is embedded in the rolled ring blank to form a -45° to 45° weight reduction window portion of the special-shaped window forging.

[0047] Step 2: Flat-nose pliers 3061 of flat-nose pliers manipulator 306 hold the forging and rotate it 90° counterclockwise. V-type pliers 3071 of V-type pliers manipulator 307 hold the mandrel 3 and rotate it 180°. Fig.11 As shown, the 800T fast forging machine drives the upper anvil 308 to forge the forging downward, and uses the No. 2 stamp 311 to form a 45° to 135° weight reduction window portion.

[0048] Step 3: Use the flat-nose pliers operating machine 306 to clamp the forging and rotate it 90° counterclockwise. Use the V-type pliers operating machine 307 to clamp the mandrel 3 and rotate it 180°. Fig.12 As shown, the 800T fast forging machine drives the upper anvil 308 to forge the forging downward, and uses the No. 1 stamp 310 to form a 135° to 225° weight reduction window portion.

[0049] Step 4: Use the flat-nose pliers operating machine 306 to clamp the forging and rotate it 90° counterclockwise. Use the V-type pliers operating machine 307 to rotate the mandrel 3 and change the number of stamps 310. Fig.13 As shown, the 800T fast forging machine drives the upper anvil 308 to forge the forging downward, and uses the No. 1 stamp 310 to form a 225° to 315° weight reduction window portion.

[0050] Step 5: Use the flat-nose pliers to operate the machine 306 to clamp the forging and rotate it 45° counterclockwise. Fig.14 As shown, the 800T fast forging machine drives the upper anvil 308 to forge the forging downward, and uses the No. 2 stamp 311 to form a 270° to 360° weight reduction window portion.

[0051] Step 6: Use the flat-nose pliers to operate the machine 306 to clamp the forging and rotate it 45° counterclockwise. Fig.15 As shown, the 800T fast forging machine drives the upper anvil 308 to forge the forging downward, and uses the No. 2 stamp 311 to form a 360° to 450° weight reduction window portion.

[0052] Step 7: Use the flat-nose pliers to operate the machine 306 to clamp the forging and rotate it 45° counterclockwise. Fig.16 As shown, the 800T fast forging machine drives the upper anvil 308 to forge the forging downward, and uses the No. 2 stamp 311 to form a 450° to 540° weight reduction window portion.

[0053] In this way, during the forging process, the positioning platform 303 and the limiting platform 302 of the core rod 3 work together to complete the net near forging forming of the special-shaped window part, greatly reducing the processing cycle. In addition, such net near forming processing can ensure that the metal flows evenly and smoothly, and ensure that there are no forging defects such as folding, rib penetration, and cracks inside the forging.

[0054] Trimming, rounding, such as Fig.17 As shown, the upper and lower anvils 312 are used to trim and round the forging ring blank that is close to the final forging temperature and is nearly formed into a special-shaped window forging, so as to ensure that the outer shape processing allowance is uniform, so as to facilitate processing into parts based on the outer circle.

[0055] After the forging ring blank is cooled, the forging size is inspected.

[0056] Heat treatment: the forgings of the nearly formed special-shaped windows are subjected to solution treatment at 1020-1080°C for 100-150 minutes and then water-cooled.

[0057] One piece of the special-shaped window part formed by this scheme was randomly selected as a test ring for performance testing. The test ring was sampled for macroscopic and microscopic inspection. The test results met the requirements of GJB5040 standard. The macroscopic structure had no defects such as cracks, non-metallic inclusions, delamination, folding, and piercing. The grain size was grade 6, and the microstructure had no overheating or overburning. A tangential specimen was taken from the test ring for mechanical property testing. The test results are shown in Table 1 below:

[0058] Table 1 Mechanical properties parameters

[0059]

[0060]

[0061] It can be seen from the above table that the measured physical and chemical parameters of the special-shaped window parts processed by this scheme are better than the standard requirements, and the performance is reliable.

[0062] Compared with the existing straight tube blank processing technology, the technical solution of the present invention has the following significant effects:

[0063] (1) Processing of straight tube blanks, the streamline at the root of the lifting ear is as follows Fig.18 As shown, its streamline is cut off, which affects the bearing strength and poses a safety hazard. The present invention uses a rolled ring-shaped blank for processing, and the streamline at the root of the lifting ear is as shown in FIG. Fig.19 As shown, its streamline is continuous, its bearing strength is higher than that of straight tube blank, and there is no safety hazard.

[0064] (2) Processing of straight tube billets, blanking specifications φ250*565mm, blanking weight 219kg. The present invention adopts rolled ring billets, blanking specifications φ200*410mm, blanking weight 102kg. Compared with straight tube billet processing, the processing of rolled ring billets saves 219-102=117kg of raw materials, calculated at 42 yuan / kg (bars are purchased according to GB / T1220 and put into production after re-inspection), saving raw material costs 117*42=4914 yuan / piece.

[0065] (3) Machining hours

[0066] 1) Processing route and working hours of straight tube blanks

[0067] ① Flat end face (50') - ② Rough turning (180') - ③ Milling two hanging ear bosses and drilling holes (300') - ④ Fine turning (180') - ⑤ Milling flat ribs and waist grooves (450') - ⑥ Milling eight side sinkers (3000') - ⑦ Fitting the inner fillet, corner cleaning and polishing of eight sinkers (3000') - ⑧ Cleaning and packaging (40'), a total of 7200' (120 hours in total) is required.

[0068] 2) Processing route and working time of the blank after near-net forming of the special-shaped window of the technical solution of the present invention

[0069] ① Flat end face (50') - ② Rough turning (120') (- ultrasonic testing) - ③ Milling two hanging ear bosses and drilling holes (300') - ④ Fine turning (150') - ⑤ Milling flat ribs and waist grooves (450') - ⑥ Bench repair of eight sinkers' inner R, corner cleaning and polishing (1590') - ⑦ Cleaning and packaging (40'), a total of 2700' (45 hours in total).

[0070] 3) Machining saves time and money

[0071] The technical solution of the present invention saves 120-45=75 hours of machining time after the near-net-shape forming of the special-shaped window. Calculated at 60 yuan / h, the labor cost saved is 75*60=4500 yuan / piece.

[0072] (4) Cost savings by changing straight tube blank processing to special-shaped window near-net-shape processing

[0073] The cost saving of blank is 4914 yuan / piece + the cost saving of machining is 4500 yuan / piece - the shared special tooling fee is 565 yuan / piece = 8849 yuan / piece, that is, the near-net forming of the special-shaped window using the technical solution of the present invention can save the cost of each product by at least 8800 yuan / piece.

[0074] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Special-shaped window forging net near-forming tooling, characterized by: It includes a core rod, the middle part of the core rod is a forming section, the upper end face and the lower end face of the forming section are both arc surfaces, a No. 1 stamp is provided in the middle of the upper end face, and a No. 2 stamp is provided in the middle of the lower end face, the No. 1 stamp and the No. 2 stamp are used for forging and near-forming eight weight-reducing windows of two different sizes on the inner side of the special-shaped window parts, a supporting mechanism is provided below both ends of the core rod, and a driving mechanism for driving the core rod to rotate is provided on the outer side of the supporting mechanism; a limiting platform is provided on the left side of the forming section, and a positioning platform is provided on the right side of the forming section; the left and right ends of the core rod are both square supporting sections, the supporting mechanism includes a left flat anvil and a right flat anvil, and the supporting sections at both ends of the core rod are supported and placed by the left flat anvil and the right flat anvil; the driving mechanism is a V-type clamp manipulator arranged on the right side of the right flat anvil, the V-type clamp manipulator is provided with a V-type clamp for clamping the right end of the core rod, and the V-type clamp manipulator can clamp the core rod through the V-type clamp and drive the core rod to rotate; a flat-nose clamp manipulator is provided on the left side of the left flat anvil, and the flat-nose clamp manipulator clamps the forging blank through the flat-nose clamp and rotates.

2. The net near-forming tooling for forging special-shaped windows according to claim 1 is characterized in that: An upper mold anvil is arranged above the core rod forming section, and a lower mold anvil is arranged below the core rod forming section. Semicircular mold cavities are arranged on the upper mold anvil and the lower mold anvil.

3. The net near forming process of special-shaped window forging is characterized by: Including the following processes: A. Tooling production, processing and manufacturing the special-shaped window forging net near-forming tooling as claimed in claim 2; B. Billet preparation: heating the raw materials and forging them into cylindrical billets; C. Net near forming: insert the blank into the mandrel forming section, use the press to drive the upper anvil to forge the blank, so that the No. 1 or No. 2 stamping on the mandrel is embedded in the blank to form the forging weight reduction window, use the V-type clamp operator to clamp the mandrel and rotate it clockwise, and the flat-nose clamp operator to clamp the blank and rotate it counterclockwise, adjust the position of the blank and the mandrel to forge and form eight weight reduction windows, including: Step 1: The V-type clamp operator clamps the right end of the mandrel, heats the prepared rolled ring blank and puts it on the mandrel, and uses the positioning table to provide a positioning reference. The limit table is used to prevent the mandrel from falling off, and the mandrel is placed on the left flat anvil and the right flat anvil. The fast forging machine forges the rolled ring blank downward through the upper anvil. After compacting the rolled ring blank, the No. 1 stamp on the mandrel is embedded in the rolled ring blank to form the -45° to 45° weight loss window part of the special-shaped window forging; Step 2: The flat-nose pliers operator clamps the forging with a flat-nose pliers and rotates it 90° counterclockwise. The V-type pliers operator clamps the mandrel with a V-type pliers and rotates it 180°. The fast forging machine drives the upper anvil to forge the forging downward, and uses the No. 2 stamp to form a 45° to 135° weight loss window part. Step 3: Use a flat-nose pliers operator to clamp the forging and rotate it 90° counterclockwise, use a V-type pliers operator to clamp the mandrel and rotate it 180°, the fast forging machine drives the upper anvil to forge the forging downward, and use a No. 1 stamp to form a 135° to 225° weight loss window part; Step 4: Use the flat-nose pliers to clamp the forging and rotate it 90° counterclockwise. Use the V-pliers to rotate the mandrel to change the No. 1 stamp. The fast forging machine drives the upper anvil to forge the forging downward. Use the No. 1 stamp to form the 225°~315° weight loss window part. Step 5: Use a flat-nose pliers operator to clamp the forging and rotate it 45° counterclockwise. The fast forging machine drives the upper anvil to forge the forging downward, and use No. 2 stamping to form a 270° to 360° weight loss window part; Step 6: Use a flat-nose pliers operator to clamp the forging and rotate it 45° counterclockwise. The fast forging machine drives the upper anvil to forge the forging downward, and use No. 2 stamping to form a 360° to 450° weight loss window part; Step 7: Use a flat-nose pliers operator to clamp the forging and rotate it 45° counterclockwise. The fast forging machine drives the upper anvil to forge the forging downward, and use No. 2 stamping to form a 450° to 540° weight loss window part.

4. The net near-forming process for forging special-shaped windows according to claim 3 is characterized in that: After completing step C, the formed forging is subjected to a solution treatment, wherein the solution treatment is performed by keeping the forging at 1020-1080° C. for 100-150 minutes and then water cooling.

5. The net near-forming process for forging special-shaped windows according to claim 4 is characterized in that: In step A, the core rod axis is controlled to be on the same straight line, and when the core rod forming section is produced, a 1% heat shrinkage is added to the size of the special-shaped window forging, so that the shape and size of the forming section and the weight-reducing window after the forging is cooled are consistent.

6. The net near-forming process for forging special-shaped windows according to claim 5 is characterized in that: In the step B, the blank is heated to 1150-1180° C. in an electric furnace and kept warm for 80-120 minutes at 0.4-0.6 min / mm.

7. The net near-forming process for forging special-shaped windows according to claim 6 is characterized in that: In the step B, the blank is first heated and then forged into a straight cylinder, and then heated again under the same heating parameters and rolled into a ring-rolled blank in the shape of a cylinder with an inner flange.

Images