Room temperature composite soft package method for hot die forging of high temperature alloy forgings and forging method of high temperature alloy forgings

Abstract

The present invention relates to a room temperature composite soft sheathing method for hot die forging of high temperature alloy forgings and a forging method of high temperature alloy forgings. The sheathing method comprises the following steps: cleaning the surface of the blank; cutting a sheathing material suitable for the shape and size of the blank; applying a high temperature adhesive to one side of the sheathing material; covering the surface of the blank with one side of the sheathing material coated with the high temperature adhesive, and wrapping it with glass fiber cloth to obtain a sheathed blank; the sheathing material is an aluminum silicate fiber blanket or aluminum silicate felt. The inventor of the room temperature composite soft sheathing method for hot die forging of high temperature alloy forgings provided by the present invention has found through repeated experiments that glass fiber cloth can replace the previous stainless steel sheath and / or metal fixing strip, making the entire sheathing and forging process more convenient to operate and less expensive, thereby improving product quality and processing efficiency.

Description

Technical Field

[0001] The invention relates to a processing technology of metal materials, in particular to a room temperature composite soft covering method and a forging method for hot die forging of high temperature alloy forgings. Background Art

[0002] Difficult-to-deform high-temperature alloys have the characteristics of high alloying and high strengthening phase content. In the die forging process of turbine disk forgings, there are prominent problems such as high hot working temperature (generally 1000-1200℃), narrow deformation window temperature range, poor thermoplasticity, easy cracking, difficult complete recrystallization, and large deformation resistance, and they are sensitive to temperature drop. When the deformation temperature is lower than the optimal hot working range of the alloy (generally not more than 100℃), on the one hand, the hot working performance of the alloy deteriorates, resulting in easy cracking and increased deformation resistance on the surface of the forging; on the other hand, it is difficult for the alloy to completely recrystallize, resulting in coarse grains and mixed grains in the forgings. Therefore, the control of forging temperature during the die forging of difficult-to-deform high-temperature alloy turbine disks is particularly important for obtaining ideal disk forgings.

[0003] Isothermal forging is generally used to produce hard-to-deform high-temperature alloy turbine disc forgings to ensure that the forging temperature does not drop. However, isothermal forging has disadvantages such as high requirements for forging equipment, high requirements for mold materials, relatively complex forging process, low production efficiency, and high production costs. Therefore, my country generally adopts hot die forging with various insulation measures for the billet to prepare deformable high-temperature alloy turbine disc forgings, especially the preparation of large-sized hard-to-deform high-temperature alloy turbine disc forgings. The typical insulation method is to wrap a certain thickness of aluminum silicate fiber insulation blanket on the surface of the billet to slow down the transfer of the billet and the heat loss caused by radiation, convection and heat exchange when the billet contacts the upper and lower dies, thereby reducing the temperature drop of the billet to ensure the die forging temperature.

[0004] Traditional methods mainly include stainless steel aluminum silicate composite hard package (patent number CN101147950A) and aluminum silicate fiber insulation blanket thermal soft package (see CN 103394629B).

[0005] The characteristic of stainless steel aluminum silicate composite hard sheath is that the blank is sheathed at room temperature, glass lubricant is applied to the outside of the blank, and then a layer of aluminum silicate fiber blanket or aluminum silicate fiber felt is coated on the surface of the blank, and a layer of stainless steel sheath is welded on the outermost side, and then heated forged. The stainless steel aluminum silicate composite hard sheath is operated at room temperature throughout the process, avoiding the danger of burning and harsh environment during high-temperature hot sheathing. However, the main problem of using stainless steel aluminum silicate composite hard sheath is that the surface quality of the forgings after forging is poor. Due to the accumulation of stainless steel sheaths, uneven pits appear on the surface of the forgings, which affects the dimensional accuracy, resulting in a smaller processing allowance for the disc forgings or even failure to meet the size. In order to reduce the risk of disc forgings being unqualified due to pits, it is generally necessary to increase the allowance of 3 to 5 mm on one side of the disc forgings, resulting in a waste of raw materials; at the same time, after the blank is sheathed and heated, due to the heat insulation effect of the sheath, the sheathed blank will take longer to penetrate than the unsheathed blank.

[0006] The hot soft wrapping of aluminum silicate fiber insulation blanket is to heat the blank to a certain temperature (generally near the forging temperature) in a heating furnace and keep it warm, then take out the blank, and then manually wrap a layer of aluminum silicate fiber blanket with a high-temperature adhesive on the surface of the blank, and finally heat and keep it warm before forging. The advantages of this method are: 1) Since the aluminum silicate fiber blanket has good coordination during the forging process, the residue after forging is evenly distributed, and there will be no accumulation of stainless steel sleeves to cause uneven pits on the surface of the forging, so the surface quality of the disc forging is good and the size control is accurate; 2) After the blank is heated to a certain temperature and kept warm, the wrapping can shorten the billet insulation time. The disadvantages of this method are: 1) The blank needs to be heated to more than 1000℃ before being taken out of the furnace and wrapped, which requires workers to operate at high temperature, and the safety and operability are poor; 2) When there are many forging blanks, the long wrapping time and frequent opening and closing of the furnace door will cause temperature drop, so that the actual temperature of each blank after wrapping is different, which is not conducive to the control of the consistency of the forging process.

[0007] In view of this, the present invention is proposed. Summary of the invention

[0008] The object of the present invention is to provide a room temperature composite soft covering method for hot die forging of high temperature alloy forgings, which is simple, safe to operate, cost-saving and significantly improves product quality.

[0009] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0010] In a first aspect, a room temperature composite soft covering method for hot die forging of a high temperature alloy forging is provided, comprising the following steps:

[0011] Clean the surface of the blank;

[0012] Cutting the covering material to the shape and size suitable for the blank;

[0013] Applying a high temperature adhesive to one side of the covering;

[0014] One side of the coating coated with a high temperature adhesive is covered on the surface of the blank, and is wrapped with glass fiber cloth to obtain a coated blank;

[0015] The coating is an aluminum silicate fiber blanket or an aluminum silicate felt.

[0016] The room temperature composite soft sheathing method for hot die forging of high-temperature alloy forgings provided by the present invention is found by the inventor after repeated experiments that glass fiber cloth can replace the previous stainless steel sheath and / or metal fixing strip, making the entire sheathing and forging process more convenient to operate and less costly, thereby improving the quality of processed products and the efficiency of product processing.

[0017] In the present invention, the high temperature adhesive is evenly applied to the entire surface of one side of the covering.

[0018] Furthermore, the dirt on the surface of the blank is cleaned with a cleaning agent and then air-dried. The dirt mainly includes oil, dust and the like.

[0019] Furthermore, the thickness range of the aluminum silicate fiber blanket includes but is not limited to 5-50 mm.

[0020] For example, in different embodiments, the thickness of the aluminum silicate fiber blanket can be 5mm, 8mm, 10mm, 12mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 30mm, 35mm, 40mm, 45mm, 48mm, 50mm, etc.

[0021] Furthermore, the thickness range of the aluminum silicate felt includes but is not limited to 0.5-15 mm, preferably 1-5 mm.

[0022] For example, in different embodiments, the thickness of the aluminum silicate felt can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 7 mm, 10 mm, 12 mm, 13 mm, 15 mm, etc.

[0023] In the present invention, aluminum silicate fiber blanket or aluminum silicate felt is used to cover the high-temperature alloy forging, and there is no obvious difference in the calcination effect.

[0024] Furthermore, the temperature of the blank entering the furnace is higher than 1100° C., and the thickness of the aluminum silicate fiber blanket used is 20-25 mm; the temperature of the blank entering the furnace is lower than 1100° C., and the thickness of the aluminum silicate fiber blanket used is 15-20 mm.

[0025] For example, in different embodiments, when the temperature of the blank entering the furnace is higher than 1100°C, the thickness of the aluminum silicate fiber blanket can be 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, etc.; when the temperature of the blank entering the furnace is lower than 1100°C, the thickness of the aluminum silicate fiber blanket can be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc.

[0026] Select the appropriate thickness of the aluminum silicate fiber blanket according to the temperature of the blank entering the furnace.

[0027] Furthermore, the thickness range of the glass fiber cloth includes but is not limited to 0.1-2 mm.

[0028] For example, in different embodiments, the thickness of the glass fiber cloth can be 0.1 mm, 0.2 mm, 0.5 mm, 0.7 mm, 1 mm, 1.5 mm, 2 mm, etc.

[0029] The width of the glass fiber cloth is selected according to the alloy forging to be wrapped. Generally, the typical width of the glass fiber cloth is 20-100 mm.

[0030] For example, in different embodiments, the width of the glass fiber cloth can be 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, etc., preferably 25-40 mm.

[0031] Furthermore, the high temperature alloy includes a difficult-to-deform high temperature alloy, a deformable high temperature alloy and a powder high temperature alloy with a strengthening phase content of more than 40%.

[0032] Deformed high-temperature alloys refer to a type of metal material based on iron, nickel and cobalt, which can resist oxidation or corrosion in high-temperature environments above 600°C and can work for a long time under certain stress.

[0033] Further, the types of typical deformable high-temperature alloys with a strengthening phase content of more than 40% include but are not limited to GH4720Li, GH4710 and GH4151;

[0034] The types of the other typical deformed high-temperature alloys include but are not limited to GH4169, GH4169D and GH4738;

[0035] The types of typical powder high temperature alloys include but are not limited to FGH95, FGH96 and FGH98.

[0036] Further, the blank includes any one of the following:

[0037] a) Cylindrical blank in first fire forming;

[0038] b) Any one or both of the cylindrical blanks of the first fire and the cake blanks of the second fire in two-fire molding;

[0039] c) Any one or more of the cylindrical blanks in the first fire, the cake blanks in the second fire, and the special-shaped blanks in the subsequent fires in multi-fire forming.

[0040] Furthermore, the blank is a blank for a disc forging.

[0041] That is, the high-temperature alloys provided in the present invention include: difficult-to-deform high-temperature alloys with a strengthening phase content of more than 40%, such as GH4720Li, GH4710 and GH4151, and are also suitable for die forging sleeves of deformable high-temperature alloys such as GH4169, GH4169D, GH4738, and powder high-temperature alloys such as FGH95, FGH96 and FGH98.

[0042] In a second aspect, the present invention further provides a forging method for a high-temperature alloy forging, wherein the encapsulated billet obtained by the above method is put into a furnace;

[0043] After forging, the billet is cooled and processed.

[0044] The forging method of the high-temperature alloy forging provided by the present invention adopts the above-mentioned billet for calcining processing, that is, the subsequent steps are consistent with the existing ones, but the sheathing step is simple and low in cost. The final forged product has no cracks and pits on the surface, good consistency, and significantly improved quality.

[0045] In the third aspect, the present invention also provides a room temperature composite soft covering for hot die forging of high-temperature alloy forgings, characterized in that it comprises a blank, a covering, a high-temperature adhesive and a glass fiber cloth; the covering is covered on the surface of the blank through the high-temperature adhesive, the glass fiber cloth is wrapped on the covering, and the covering is an aluminum silicate fiber blanket or an aluminum silicate felt.

[0046] Furthermore, the thickness of the aluminum silicate fiber blanket is 5-50 mm; the thickness of the aluminum silicate felt is 0.5-15 mm, preferably 1-5 mm.

[0047] Furthermore, when the temperature of the blank entering the furnace is higher than 1100° C., the thickness of the aluminum silicate fiber blanket used is 20-25 mm; when the temperature of the blank entering the furnace is lower than 1100° C., the thickness of the aluminum silicate fiber blanket used is 15-20 mm.

[0048] Furthermore, the thickness of the glass fiber cloth is 0.1-2 mm, preferably 20-100 mm, and more preferably 25-40 mm.

[0049] Further, the blank includes any one of the following: a) a cylindrical blank in one-fire forming; b) any one or two of a cylindrical blank in the first fire and a cake blank in the second fire in two-fire forming; c) any one or more of a cylindrical blank in the first fire, a cake blank in the second fire, and a shaped blank in the subsequent fire in multi-fire forming. In one embodiment, the blank is a blank for a turbine disk forging.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] (1) Glass fiber cloth is used instead of the welded stainless steel cover. The glass fiber cloth melts at high temperature and has good coordination during the deformation process, so it will not form uneven sheath accumulation. Therefore, the surface quality of the forging is better and the dimensional accuracy is high, which is conducive to saving raw material costs and machining costs.

[0052] (2) The whole process is operated at room temperature, which is convenient and safe.

[0053] (3) The operation process is simplified by wrapping glass fiber cloth tightly instead of welding the stainless steel cover.

[0054] (4) Using cheap glass fiber cloth instead of more expensive stainless steel covers can save production of finished products. (5) Using glass fiber cloth instead of stainless steel covers is easy to clean. The residues of aluminum silicate fiber insulation blanket and fiber cloth will fall off naturally during the cooling process, while stainless steel is often only coated on the surface of the forging or even embedded in the forging, requiring manual cleaning.

[0055] (6) After multiple blanks are wrapped, they can be put into the furnace for heating at the same time. There is no frequent opening and closing of the furnace door during the wrapping process, and the heating consistency of the blanks is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below.

[0057] Figure 1 A schematic diagram of the structure of a room temperature composite soft package according to an embodiment of the present invention;

[0058] Figure 2 It is a front view of the GH4720Li alloy turbine disk forging in Example 4 of the present invention;

[0059] Figure 3 It is a front view of a GH4151 alloy turbine disk forging in Example 5 of the present invention;

[0060] Figure 4 This is a front view of the GH4169 alloy turbine disk forging in Example 6 of the present invention. DETAILED DESCRIPTION

[0061] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. If specific conditions are not specified in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0062] refer to Figure 1 , which shows a schematic structural diagram of a room temperature composite soft package according to an embodiment of the present invention. Figure 1 In the present invention, a room temperature composite soft covering for hot die forging of high temperature alloy forgings comprises a blank 1, a covering 2, a high temperature adhesive 3 and a glass fiber cloth 4; the covering 2 is covered on the surface of the blank 1 through the high temperature adhesive 3, the glass fiber cloth 4 is tightly wrapped on the covering 2, and the covering 2 is an aluminum silicate fiber blanket or an aluminum silicate felt.

[0063] Specifically, the dirt on the surface of the blank 1 is cleaned with a cleaning agent and then dried. Specifically, the thickness range of the aluminum silicate fiber blanket includes but is not limited to 5-50 mm; the thickness range of the aluminum silicate felt includes but is not limited to 0.5-15 mm, preferably 1-5 mm.

[0064] In different embodiments, the high temperature adhesive 3 is a glass adhesive with a thickness ranging from 0.5 to 15 mm, preferably from 1 to 13 mm, and more preferably from 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 mm.

[0065] In different embodiments, the thickness of the aluminum silicate fiber blanket can be 5mm, 8mm, 10mm, 12mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 30mm, 35mm, 40mm, 45mm, 48mm, 50mm, etc. In different embodiments, the thickness of the aluminum silicate felt can be 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 7mm, 10mm, 12mm, 13mm, 15mm, etc. Specifically, the temperature of the blank 1 entering the furnace is higher than 1100°C, and the thickness of the aluminum silicate fiber blanket used is 20-25mm; the temperature of the blank 1 entering the furnace is lower than 1100°C, and the thickness of the aluminum silicate fiber blanket used is 15-20mm. Specifically, the thickness range of the glass fiber cloth 4 includes but is not limited to 0.1-2mm.

[0066] In different embodiments, the thickness of the glass fiber cloth 4 may be 0.1 mm, 0.2 mm, 0.5 mm, 0.7 mm, 1 mm, 1.5 mm, 2 mm, etc. Specifically, the width of the glass fiber cloth 4 includes but is not limited to 20-100 mm, preferably 25-40 mm.

[0067] In different embodiments, the width of the glass fiber cloth 4 can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, etc., preferably 25-40mm. Specifically, the high-temperature alloy includes a deformed high-temperature alloy, a deformed high-temperature alloy and a powder high-temperature alloy with a strengthening phase content of more than 40%. Specifically, the types of the deformed high-temperature alloy with a strengthening phase content of more than 40% include but are not limited to GH4720Li, GH4710 and GH4151; the types of the other typical deformed high-temperature alloys include but are not limited to GH4169, GH4169D and GH4738; the types of the typical powder high-temperature alloy include but are not limited to any one of FGH95, FGH96 and FGH98.

[0068] Specifically, the blank 1 includes any one of the following:

[0069] a) Cylindrical blank in first fire forming;

[0070] b) Any one or both of the cylindrical blanks of the first fire and the cake blanks of the second fire in two-fire molding;

[0071] c) any one or more of the cylindrical blanks in the first fire, the cake blanks in the second fire, and the special-shaped blanks in the subsequent fires in the multi-fire forming;

[0072] Furthermore, the blank 1 is a blank for a turbine disk forging.

[0073] That is, the high-temperature alloys provided in this application include: GH4720Li, GH4710, GH4151, GH4065, GH4175 and other difficult-to-deform high-temperature alloys with a strengthening phase content of more than 40%, and are also suitable for die forging sleeves of deformable high-temperature alloys such as GH4169, GH4169D, GH4738, and powder high-temperature alloys such as FGH95, FGH96 and FGH98.

[0074] Furthermore, the present invention provides a room temperature composite soft package for hot die forging of high temperature alloy forgings and a forging method, the steps of which are as follows:

[0075] Step 1: Clean the surface of the blank. At room temperature, use a cleaning agent to clean the oil, dust, etc. on the surface of the blank and let it dry.

[0076] Step 2: Preparation of aluminum silicate fiber blanket: At room temperature, according to the control requirements of forging temperature, select aluminum silicate fiber blanket of appropriate thickness, and cut aluminum silicate fiber blanket of appropriate size according to the shape and size of the blank.

[0077] Step 3: Apply the high temperature adhesive. At room temperature, apply the high temperature adhesive evenly on the surface of the cut aluminum silicate fiber blanket.

[0078] Step 4: Compounding of the blank and the aluminum silicate fiber blanket. At room temperature, the aluminum silicate fiber blanket coated with a high-temperature adhesive is brought into contact with the blank, and all surfaces of the blank need to be in full contact with the aluminum silicate fiber blanket with the high-temperature adhesive.

[0079] Step 5: Compounding of aluminum silicate fiber blanket and glass fiber cloth. At room temperature, tightly wrap glass fiber cloth of appropriate specifications around the outside of the aluminum silicate fiber blanket to fully contact the blank, high-temperature adhesive and aluminum silicate fiber blanket.

[0080] Step 6: Put the wrapped blank into the furnace. Put the room temperature soft-wrapped blank into the heating furnace for heat preservation.

[0081] Step 7: Forging of billet. Take the billet out of the heating furnace for forging (free forging or die forging).

[0082] Step 8: Cooling and machining of disc forgings. Disc forgings are machined after cooling according to process requirements.

[0083] The blanks referred to above include 1) cylindrical blanks in one-fire forming; 2) cylindrical blanks in the first fire and cake blanks in the second fire in two-fire forming; 3) cylindrical blanks in the first fire, cake blanks in the second fire, and special-shaped blanks in subsequent fires in multi-fire forming.

[0084] The following is an example.

[0085] Embodiment 1:

[0086] In this embodiment, a room temperature composite soft package for hot die forging of high temperature alloy forgings is provided, which includes a blank 1, a coating 2, a high temperature adhesive 3 and a glass fiber cloth 4; the coating 2 is covered on the surface of the blank 1 through the high temperature adhesive 3, and the glass fiber cloth 4 is tightly wrapped on the coating 2, and the coating 2 is an aluminum silicate fiber blanket or aluminum silicate felt. Among them, the blank 1 is a cylindrical blank in a fire forming process; the coating 2 is an aluminum silicate felt with a thickness of 4mm; the high temperature adhesive 3 is a glass adhesive with a thickness of 5mm; the thickness of the glass fiber cloth 4 is 1mm.

[0087] After being wrapped, a plurality of blanks 1 are simultaneously put into the furnace for heating without frequent opening and closing of the furnace door, and the heating consistency of the blanks 1 is good.

[0088] Embodiment 2:

[0089] In this embodiment, a room temperature composite soft package for hot die forging of high temperature alloy forgings is provided, which includes a blank 1, a coating 2, a high temperature adhesive 3 and a glass fiber cloth 4; the coating 2 is covered on the surface of the blank 1 through the high temperature adhesive 3, and the glass fiber cloth 4 is tightly wrapped on the coating 2, and the coating 2 is an aluminum silicate fiber blanket or an aluminum silicate felt. Among them, the blank 1 is a second fire cake blank in two-fire molding; the coating 2 is an aluminum silicate fiber blanket with a thickness of 24mm; the high temperature adhesive 3 is a glass adhesive with a thickness of 7mm; the thickness of the glass fiber cloth 4 is 1.5mm.

[0090] After being wrapped, a plurality of blanks 1 are simultaneously put into the furnace for heating without frequent opening and closing of the furnace door, and the heating consistency of the blanks 1 is good.

[0091] Embodiment 3:

[0092] In this embodiment, a room temperature composite soft package for hot die forging of high temperature alloy forgings is provided, which includes a blank 1, a coating 2, a high temperature adhesive 3 and a glass fiber cloth 4; the coating 2 is covered on the surface of the blank 1 through the high temperature adhesive 3, and the glass fiber cloth 4 is tightly wrapped on the coating 2, and the coating 2 is an aluminum silicate fiber blanket or an aluminum silicate felt. Among them, the blank 1 is a blank of a turbine disk forging; the coating 2 is an aluminum silicate fiber blanket with a thickness of 18 mm; the high temperature adhesive 3 is a glass adhesive with a thickness of 10 mm; and the glass fiber cloth 4 has a thickness of 0.7 mm.

[0093] After multiple blanks 1 are wrapped, they are simultaneously heated in the furnace without frequent opening and closing of the furnace door. The heating consistency of the blanks 1 is good. Example 4

[0094] The one-fire die forging process is used to prepare Figure 1 The steps for the GH4720Li alloy turbine disk forging shown are as follows:

[0095] Step 1: Cleaning the surface of the blank. At room temperature, clean the oil, dust, etc. on the surface of the cylindrical blank (size Φ180×345mm) with a cleaning agent and dry it.

[0096] Step 2: Preparation of aluminum silicate fiber blanket. GH4720Li alloy has poor thermoplasticity and is prone to cracking. The forging temperature is 1120-1200℃. Select a 25mm thick aluminum silicate fiber blanket and cut two Φ180±5mm discs and one 600×(360-370)mm rectangular sheet.

[0097] Step 3: Apply the high temperature adhesive. At room temperature, evenly apply the high temperature adhesive on the two round pieces and one rectangular piece of aluminum silicate fiber blanket.

[0098] Step 4: Compounding of blank and aluminum silicate fiber blanket. At room temperature, aluminum silicate fiber blanket coated with high temperature adhesive is placed in contact with blank, upper and lower end faces of cylindrical blank are in contact with round sheet, and circumference of cylindrical blank is in contact with rectangular sheet.

[0099] Step 5: Compounding of aluminum silicate fiber blanket and glass fiber cloth. At room temperature, tightly wrap the 30mm wide × 0.5mm thick glass fiber cloth around the aluminum silicate fiber blanket, so that all cylindrical blank surfaces, high temperature adhesive, and aluminum silicate fiber blanket are in full contact.

[0100] Step 6: Put the encapsulated blank into the furnace. Put the room temperature soft encapsulated cylindrical blank into the heating furnace for heating at a temperature of 1120-1200°C for 3-6 hours.

[0101] Step 7: Billet die forging. Take the billet out of the heating furnace after heat preservation, put it into the die, and carry out one-time direct hot die forging (die temperature 800-1000℃), with a nominal deformation of 70%, and then air cool it.

[0102] Step 8: Cooling and machining of disc forgings. After the disc forgings are cooled according to the process requirements, they are machined after the surface sheath residues are cleaned.

[0103] (1) Package process and cost comparison

[0104] Table 1 Package process and cost comparison

[0105] Packing method Operation time Operating Environment Packing quality Package cost Room temperature composite soft package 3 minutes / item Level 10 Level 2 0.6 Room temperature composite hard package 5 minutes / item Level 10 Level 1 1 High temperature heat wrap 5 minutes / item Level 0 Level 0.5 0.5

[0106] Although the wrapping time and cost of room temperature composite soft wrapping are slightly higher than those of high temperature thermal wrapping, the operating environment and wrapping quality are the best. The operating time and wrapping cost of room temperature composite soft wrapping are lower than those of room temperature composite hard wrapping.

[0107] Note: 1. Room temperature composite soft packaging - this patented packaging method; room temperature composite hard packaging - stainless steel cover + aluminum silicate blanket or felt composite hard packaging; high temperature hot packaging - the blank is heated to a high temperature and then taken out of the furnace for packaging.

[0108] 2. Operation time is calculated based on the average time of the whole process of wrapping 10 blanks.

[0109] 3. Operating environment: When the billet is operated at room temperature, it is level 10. When the temperature rises by 100 degrees, the rating decreases by 1 level. Level 0 is above 1000℃.

[0110] 4. Package quality: room temperature composite hard package is grade 1. The higher the grade, the better the package quality.

[0111] 5. The cost of the package is based on the cost of the room temperature composite hard package.

[0112] (2) Surface quality of disc forgings

[0113] Table 2 Surface quality of disc forgings

[0114] Packing method Upper axis Lower shaft Decent upper plate Decent bottom plate Circumferential surface of the disk Room temperature composite soft package Level 1 Level 1 Level 1 Level 1 Level 1 Room temperature composite hard package Level 2 Level 2 Level 6 Level 3 Level 5 High temperature heat wrap Level 1 Level 1 Level 2 Level 2 Level 5

[0115] Note: After die forging, the surface quality of the disc forging is defined as 6 levels: Level 1 is no cracks and no pits on the surface; Level 2 is no cracks on the surface with slight pits; Level 3 is no cracks on the surface with serious pits; Level 4 is slight cracks on the surface and no pits; Level 5 is slight cracks on the surface with slight pits; Level 6 is slight cracks on the surface with serious pits.

[0116] (3) Disc forging blank weight and machining time

[0117] Table 3 Disc forging blank weight and machining time

[0118] Packing method Billet weight Machining time Room temperature composite soft package 0.75 0.75 Room temperature composite hard package 1 1 High temperature heat wrap 0.9 0.8

[0119] Note: 1. The weight of the blank is based on the weight of the composite hard package at room temperature.

[0120] 2. Machining time is based on the machining time of room temperature composite hard-packed disc forgings.

[0121] Example 5

[0122] The two-fire (upsetting + die forging) forming process is used to prepare Figure 2 The GH4151 alloy turbine disk forging is shown. The steps are as follows:

[0123] Step 1: Cleaning the surface of the blank. At room temperature, clean the oil, dust, etc. on the surface of the cylindrical blank (size Φ150×350mm) with a cleaning agent and dry it.

[0124] Step 2: Preparation of aluminum silicate fiber blanket. GH4151 alloy has poor thermoplasticity and is sensitive to temperature drop. The forging temperature is 1150-1200℃. Select a 25mm thick aluminum silicate fiber blanket and cut two Φ150±5mm round pieces and one 500×(360-370)mm rectangular piece.

[0125] Step 3: Apply the high temperature adhesive. At room temperature, evenly apply the high temperature adhesive on the two round pieces and one rectangular piece of aluminum silicate fiber blanket.

[0126] Step 4: Compounding of blank and aluminum silicate fiber blanket. At room temperature, the aluminum silicate fiber blanket coated with a high temperature adhesive on one side is in contact with the blank, the upper and lower end faces of the cylindrical blank are in contact with the disc, and the circumference of the cylindrical blank is in contact with the rectangular sheet.

[0127] Step 5: Compounding of aluminum silicate fiber blanket and glass fiber cloth. At room temperature, tightly wrap the 30mm wide × 0.5mm thick glass fiber cloth around the aluminum silicate fiber blanket, so that all cylindrical blank surfaces, high temperature adhesive, and aluminum silicate fiber blanket are in full contact.

[0128] Step 6: Put the encapsulated blank into the furnace. Put the room temperature soft encapsulated cylindrical blank into the heating furnace for heating at a temperature of 1150-1200℃ for 3-6 hours.

[0129] Step 7: cylindrical billet upsetting. The billet after heat preservation is taken out from the heating furnace and subjected to the first fire deformation in a flat die (die temperature 800-1000°C), with the upsetting deformation amount of 50%, followed by air cooling.

[0130] Step 8: Clean the surface of the dough. After the dough cools to room temperature, clean the surface of the dough (size ~Φ200×180mm) of the dough.

[0131] Step 9: Preparation of aluminum silicate fiber blanket: Select an aluminum silicate fiber blanket with a thickness of 25 mm and cut two circular pieces with a diameter of 200 ± 5 mm and one rectangular piece with a diameter of 640 × (190-200) mm.

[0132] Step 10: Apply the high temperature adhesive. At room temperature, evenly apply the high temperature adhesive on the two round pieces and one rectangular piece of aluminum silicate fiber blanket.

[0133] Step 11: Compounding of the cake blank and the aluminum silicate fiber blanket. At room temperature, the aluminum silicate fiber blanket coated with a high-temperature adhesive on one side is brought into contact with the cake blank, the upper and lower end surfaces of the cake blank are brought into contact with the round sheet, and the circumference of the cake blank is brought into contact with the rectangular sheet.

[0134] Step 12: Compounding of aluminum silicate fiber blanket and glass fiber cloth. At room temperature, tightly wrap the 30mm wide × 0.5mm thick glass fiber cloth around the aluminum silicate fiber blanket to ensure that all cake surfaces, high temperature adhesive, and aluminum silicate fiber blanket are in full contact.

[0135] Step 13: Put the wrapped dough into the furnace. Put the room temperature soft wrapped dough into the heating furnace for heat preservation, the heating temperature is 1150-1200℃, and the heat preservation time is 3-6h.

[0136] Step 14: Die forging. Take the heat-insulated billet out of the heating furnace and put it into the die for the second hot die forging (die temperature 800-1000°C), with a nominal deformation of 70%, followed by air cooling.

[0137] Step 15: Cooling and machining of disc forgings. After the disc forgings are cooled according to the process requirements, the surface sheath residues are cleaned and then machined.

[0138] (1) Package process and cost comparison

[0139] Table 4 Package process and cost comparison

[0140] Packing method Operation time Operating Environment Packing quality Package cost Room temperature composite soft package 5 minutes / item Level 10 Level 2 0.5 Room temperature composite hard package 9 minutes / item Level 10 Level 1 1 High temperature heat wrap 10 minutes / item Level 0 Level 0.5 0.5

[0141] Note: 1. Room temperature composite soft packaging - this patented packaging method; room temperature composite hard packaging - stainless steel cover + aluminum silicate blanket or felt composite hard packaging; high temperature hot packaging - the blank is heated to a high temperature and then taken out of the furnace for packaging.

[0142] 2. Operation time is calculated based on the average time of the whole process of wrapping 10 blanks.

[0143] 3. Operating environment: When the billet is operated at room temperature, it is level 10. When the temperature rises by 100 degrees, the rating decreases by 1 level. Level 0 is above 1000℃.

[0144] 4. Package quality: room temperature composite hard package is grade 1. The higher the grade, the better the package quality.

[0145] 5. The cost of the package is based on the cost of the room temperature composite hard package.

[0146] (2) Surface quality of disc forgings

[0147] Table 5 Surface quality of disc forgings

[0148] Packing method Upper axis Lower shaft Decent upper plate Decent bottom plate Circumferential surface of the disk Room temperature composite soft package Level 1 Level 1 Level 1 Level 1 Level 1 Room temperature composite hard package Level 2 Level 2 Level 3 Level 3 Level 5 High temperature heat wrap Level 4 Level 4 Level 1 Level 1 Level 1

[0149] Note: After die forging, the surface quality of the disc forging is defined as 6 levels: Level 1 is no cracks and no pits on the surface; Level 2 is no cracks on the surface with slight pits; Level 3 is no cracks on the surface with serious pits; Level 4 is slight cracks on the surface and no pits; Level 5 is slight cracks on the surface with slight pits; Level 6 is slight cracks on the surface with serious pits.

[0150] (3) Disc forging blank weight and machining time

[0151] Table 6 Plate forging blank weight and machining time

[0152] Packing method Billet weight Machining time Room temperature composite soft package 0.80 0.7 Room temperature composite hard package 1 1 High temperature heat wrap 0.95 0.9

[0153] Note: 1. The weight of the blank is based on the weight of the composite hard package at room temperature.

[0154] 2. Machining time is based on the machining time of room temperature composite hard-packed disc forgings.

[0155] Example 6

[0156] The three-fire (upsetting cake + pre-forging + final die forging) forming process is used to prepare Figure 3 GH4169 alloy turbine disk forging shown.

[0157] Here are the steps:

[0158] Step 1: Cleaning the surface of the blank. At room temperature, clean the oil, dust, etc. on the surface of the cylindrical blank (size Φ280×630mm) with a cleaning agent and dry it.

[0159] Step 2: Preparation of aluminum silicate fiber blanket. GH4169 alloy has good thermoplasticity, and the forging temperature is 950-1050℃. Select a 15mm thick aluminum silicate fiber blanket and cut two Φ280±5mm round pieces and one 950×(630-640)mm rectangular piece.

[0160] Step 3: Apply the high temperature adhesive. At room temperature, evenly apply the high temperature adhesive on the two round pieces and one rectangular piece of aluminum silicate fiber blanket.

[0161] Step 4: Compounding of blank and aluminum silicate fiber blanket. At room temperature, the aluminum silicate fiber blanket coated with a high temperature adhesive on one side is in contact with the blank, the upper and lower end faces of the cylindrical blank are in contact with the disc, and the circumference of the cylindrical blank is in contact with the rectangular sheet.

[0162] Step 5: Compounding of aluminum silicate fiber blanket and glass fiber cloth. At room temperature, tightly wrap the 30mm wide × 0.5mm thick glass fiber cloth around the aluminum silicate fiber blanket, so that all cylindrical blank surfaces, high temperature adhesive, and aluminum silicate fiber blanket are in full contact.

[0163] Step 6: Put the encapsulated blank into the furnace. Put the room temperature soft encapsulated cylindrical blank into the heating furnace for heat preservation and heating, the heating temperature is 950-1050℃, and the heat preservation is 3-6h.

[0164] Step 7: cylindrical billet upsetting. The billet after insulation is taken out from the heating furnace and subjected to the first fire deformation in a flat die (die temperature 400-500°C), with the upsetting deformation amount of 50%, followed by air cooling.

[0165] Step 8: Cleaning the surface of the dough. After the dough is cooled to room temperature, clean the surface of the dough (size ~Φ380×300mm) of the dough.

[0166] Step 9: Preparation of aluminum silicate fiber blanket. Select a 15 mm thick aluminum silicate fiber blanket and cut two Φ380±5 mm round pieces and one 1300×(330-340) mm rectangular piece;

[0167] Step 10: Apply the high temperature adhesive. At room temperature, evenly apply the high temperature adhesive on the two round pieces and one rectangular piece of aluminum silicate fiber blanket.

[0168] Step 11: Compounding of the cake blank and the aluminum silicate fiber blanket. At room temperature, the aluminum silicate fiber blanket coated with a high-temperature adhesive on one side is brought into contact with the cake blank, the upper and lower end surfaces of the cake blank are brought into contact with the round sheet, and the circumference of the cake blank is brought into contact with the rectangular sheet.

[0169] Step 12: Compounding of aluminum silicate fiber blanket and glass fiber cloth. At room temperature, tightly wrap the 30mm wide × 0.5mm thick glass fiber cloth around the aluminum silicate fiber blanket to ensure that all cake surfaces, high temperature adhesive, and aluminum silicate fiber blanket are in full contact.

[0170] Step 13: Put the wrapped dough into the furnace. Put the room temperature soft wrapped dough into the heating furnace for heat preservation, the heating temperature is 950-1050℃, and the heat preservation time is 3-6h.

[0171] Step 14: Pre-forging of the billet. Take the billet out of the heating furnace after heat preservation, put it into the pre-forging die, and carry out the second fire pre-forging die forging to prepare the pre-forged disc billet (die temperature 400-500°C), with a nominal deformation of 50%, and then air-cooling.

[0172] Step 15: Cleaning the surface of the pre-forged disc. After the pre-forged disc cools to room temperature, clean the surface sheath residue;

[0173] Step 16: Preparation of aluminum silicate fiber blanket: Select a 20 mm thick aluminum silicate fiber blanket and cut two Φ600±5 mm round pieces and one 1800×(180-190) mm rectangular piece.

[0174] Step 17: Apply high temperature adhesive. At room temperature, apply high temperature adhesive evenly on the two round pieces and one rectangular piece of aluminum silicate fiber blanket.

[0175] Step 18: Compounding of pre-forged disc blank and aluminum silicate fiber blanket. At room temperature, the aluminum silicate fiber blanket coated with a high temperature adhesive on one side is brought into contact with the pre-forged disc blank, the upper and lower end surfaces of the pre-forged disc blank are brought into contact with the round sheet, and the circumferential surface of the pre-forged disc blank is brought into contact with the rectangular sheet.

[0176] Step 19: Compounding of aluminum silicate fiber blanket and glass fiber cloth. At room temperature, tightly wrap the 30mm wide × 0.5mm thick glass fiber cloth around the aluminum silicate fiber blanket, so that all the pre-forged disc blank surfaces, high temperature adhesive, and aluminum silicate fiber blanket are in full contact.

[0177] Step 20: Put the pre-forged disc into the furnace after encapsulation. Put the pre-forged disc with cold encapsulation at room temperature into the heating furnace for heat preservation at a temperature of 950-1050℃ for 3-6 hours.

[0178] Step 21: Final die forging of disc forgings. Take the pre-forged disc blank out of the heating furnace after heat preservation, put it into the final die forging die, and carry out the third fire final die forging (die temperature 400-500°C), with a nominal deformation of 60%, and then air cooling.

[0179] Step 22: Cooling and machining of disc forgings. After the disc forgings are cooled according to the process requirements, they are machined after the surface sheath residues are cleaned.

[0180] (1) Package process and cost comparison

[0181] Table 7 Package process and cost comparison

[0182] Packing method Operation time Operating Environment Packing quality Package cost Room temperature composite soft package 10 minutes / item Level 10 Level 2 0.5 Room temperature composite hard package 20 minutes / item Level 10 Level 1 1 High temperature heat wrap 15 minutes / item Level 0 Level 0.5 0.5

[0183] Note: 1. Room temperature composite soft packaging - this patented packaging method; room temperature composite hard packaging - stainless steel cover + aluminum silicate blanket or felt composite hard packaging; high temperature hot packaging - the blank is heated to a high temperature and then taken out of the furnace for packaging.

[0184] 2. Operation time is calculated based on the average time of the whole process of wrapping 10 blanks.

[0185] 3. Operating environment: When the billet is operated at room temperature, it is level 10. When the temperature rises by 100 degrees, the rating decreases by 1 level. Level 0 is above 1000℃.

[0186] 4. Package quality: room temperature composite hard package is grade 1. The higher the grade, the better the package quality.

[0187] 5. The cost of the package is based on the cost of the room temperature composite hard package.

[0188] (2) Surface quality of disc forgings

[0189] Table 8 Surface quality of disc forgings

[0190] Packing method Upper die surface Lower die surface Circumferential surface of the disk Room temperature composite soft package Level 1 Level 1 Level 1 Room temperature composite hard package Level 6 Level 6 Level 6 High temperature heat wrap Level 5 Level 5 Level 3

[0191] Note: After die forging, the surface quality of the disc forging is defined as 6 levels: Level 1 is no cracks and no pits on the surface; Level 2 is no cracks on the surface with slight pits; Level 3 is no cracks on the surface with serious pits; Level 4 is slight cracks on the surface and no pits; Level 5 is slight cracks on the surface with slight pits; Level 6 is slight cracks on the surface with serious pits.

[0192] (3) Disc forging blank weight and machining time

[0193] Table 9 Plate forging blank weight and machining time

[0194] Packing method Billet weight Machining time Room temperature composite soft package 0.7 0.7 Room temperature composite hard package 1 1 High temperature heat wrap 0.9 0.9

[0195] Note: 1. The weight of the blank is based on the weight of the composite hard package at room temperature.

[0196] 2. Machining time is based on the machining time of room temperature composite hard-packed disc forgings.

[0197] Although the present invention has been illustrated and described with specific embodiments, it will be appreciated that many other changes and modifications may be made without departing from the spirit and scope of the present invention. Therefore, it is intended to include all such changes and modifications within the scope of the present invention in the appended claims.

Claims

1. A room temperature composite soft covering method for hot die forging of high temperature alloy forgings, characterized in that: The following steps are involved: Clean the surface of the blank; Cutting the covering material to the shape and size suitable for the blank; Applying a high temperature adhesive to one side of the covering; One side of the coating coated with a high-temperature adhesive is covered on the surface of the blank, and is wrapped with glass fiber cloth to obtain a coated blank, wherein the thickness of the glass fiber cloth is 0.1-2 mm, and the width of the glass fiber cloth is 20-100 mm; The coating is an aluminum silicate fiber blanket or an aluminum silicate felt.

2. The room temperature composite soft covering method for hot die forging of high temperature alloy forgings according to claim 1, characterized in that: The width of the glass fiber cloth is 25-40 mm.

3. The room temperature composite soft covering method for hot die forging of high temperature alloy forgings according to claim 1, characterized in that: The dirt on the surface of the blank is cleaned with a cleaning agent and then air-dried.

4. The room temperature composite soft covering method for hot die forging of high temperature alloy forgings according to claim 1, characterized in that: The thickness of the aluminum silicate fiber blanket is 5-50 mm; the thickness of the aluminum silicate felt is 0.5-15 mm.

5. The room temperature composite soft covering method for hot die forging of high temperature alloy forgings according to claim 4, characterized in that: The thickness of the aluminum silicate felt is 1-5 mm.

6. The room temperature composite soft covering method for hot die forging of high temperature alloy forgings according to claim 4, characterized in that: When the temperature of the blank entering the furnace is higher than 1100° C., the thickness of the aluminum silicate fiber blanket used is 20-25 mm; when the temperature of the blank entering the furnace is lower than 1100° C., the thickness of the aluminum silicate fiber blanket used is 15-20 mm.

7. The room temperature composite soft covering method for hot die forging of high temperature alloy forgings according to any one of claims 1 to 6, characterized in that: The high-temperature alloys include deformed high-temperature alloys with a strengthening phase content of more than 40%, deformed high-temperature alloys and powdered high-temperature alloys.

8. The room temperature composite soft covering method for hot die forging of high temperature alloy forgings according to claim 7, characterized in that: The deformed high-temperature alloy with a strengthening phase content of more than 40% is any one selected from GH4720Li, GH4710 and GH4151; the deformed high-temperature alloy is any one selected from GH4169, GH4169D and GH4738; the powder high-temperature alloy is any one selected from FGH95, FGH96 and FGH98.

9. The room temperature composite soft covering method for hot die forging of high temperature alloy forgings according to claim 8, characterized in that: The blank is a blank for a turbine disk forging, which includes any one of the following: a) a cylindrical blank in one-fire forming; b) any one or two of a cylindrical blank in the first fire and a cake blank in the second fire in two-fire forming; c) any one or more of a cylindrical blank in the first fire, a cake blank in the second fire, and a special-shaped blank in subsequent fires in multi-fire forming.

10. A forging method for a high temperature alloy forging, characterized in that: The blank sheathed according to any one of claims 1 to 9 is put into a furnace; the blank is cooled and processed after forging.

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