Machining process for special-shaped thin-wall part

Abstract

The invention discloses a machining process of a special-shaped thin-wall part. The machining process aims at overcoming the defect that the special-shaped thin-wall part is prone to deformation in the machining process. The method comprises the following steps: S1, roughing a blank to form a blank piece; s2, performing heat treatment on the blank; s3, a datum plane is machined on the blank piece, and the blank piece is glued to the transition plate during machining; s4, the bottom face and the cavity face of the blank piece are subjected to semi-finish machining; s5, semi-finishing the reverse side of the cavity surface of the blank; s6, repeating the step S3; s7, finish machining of the bottom surface and the cavity surface; s8, the reverse side of the cavity face of the blank is subjected to finish machining; s9, finish machining of the reverse side of the bottom surface; and S10, the inverted buckle characteristics in the upper cavity of the blank piece are machined. According to the machining technology for the special-shaped thin-wall part, the special-shaped thin-wall part is not prone to deformation in the machining process, and the machining quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and more specifically, to a processing technology for special-shaped thin-walled parts. Background Art

[0002] With the rapid development of modern manufacturing industry, one-piece thin-walled parts have been increasingly widely used in various high-precision equipment because of their stable structure, no welding defects, high processing accuracy, stable product quality, high structural strength and corrosion resistance. In actual production, one-piece processing of parts will be affected by many factors such as cutting force, cutting heat, machine tool fixtures, and tools, making the machining of parts very difficult. The main reason is that the product is difficult to clamp due to its special shape, the local thin wall has poor rigidity and weak strength, and it is very easy to deform during processing, which increases the shape and position errors of the parts and cannot guarantee the processing quality of the parts. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings, the present invention provides a processing technology for special-shaped thin-walled parts, during which the special-shaped thin-walled parts are not easily deformed, thereby ensuring the processing quality.

[0004] In order to solve the above technical problems, the present invention adopts the following technical scheme: a processing technology for special-shaped thin-walled parts, comprising the following steps: S1, roughing the blank to form a blank; S2, heat treating the blank; S3, machining a reference surface on the blank, and gluing the blank to a transition plate during machining; S4, semi-finishing the bottom surface and cavity surface of the blank; S5, semi-finishing the reverse side of the cavity surface of the blank; S6, repeating S3; S7, finishing the bottom surface and cavity surface; S8, finishing the reverse side of the cavity surface of the blank; S9, finishing the reverse side of the bottom surface; S10, machining the undercut feature in the cavity of the blank.

[0005] During the processing of special-shaped thin-walled parts, heat treatment is performed to relieve stress after roughing. When processing the reference surface, the blank is glued to the transition plate, which is reliable in positioning and the special-shaped thin-walled blank is not easy to deform. During machining, semi-finishing is performed first, and then finishing is performed to ensure the accuracy of the processing. In addition, the reference surface is processed before semi-finishing and finishing, which makes the processing more accurate and ensures the processing quality.

[0006] The processing technology of the special-shaped thin-walled parts disclosed in the patent application makes the special-shaped thin-walled parts less likely to deform during processing, thereby ensuring the processing quality.

[0007] Preferably, the blank in S1 is roughened but a 2.5-3.5 mm margin is reserved on the surface.

[0008] After roughing the blank, reserve appropriate machining allowance to facilitate subsequent machining and ensure machining quality.

[0009] Preferably, the S2 blank is heat treated at a temperature of 195-205°C for 9-11 hours, followed by natural cooling.

[0010] The heat treatment temperature and time are appropriate, and the stress relief effect is good.

[0011] Preferably, the blank comprises a bottom plate and a cavity shell, a connecting seat is arranged between the bottom plate and the cavity shell, the bottom plate is glued to the transition plate, and the reference plane is arranged on the outer bottom surface of the cavity shell.

[0012] When the reference surface is processed, the bottom plate on the blank is glued to the transition plate, the connection force area is large, and the blank is not easy to deform.

[0013] Preferably, a through groove is provided on the surface of the bottom plate, and a positioning block is installed on the transition plate, and the positioning block is adapted to be inserted into the through groove.

[0014] When the base plate is connected to the transition plate, the positioning block on the transition plate is adapted to be inserted into the through slot on the base plate to ensure the accuracy of the clamping position of the blank.

[0015] Preferably, a shaping plate is arranged below the cavity shell, and a shaping column is adapted to be loaded in the cavity shell, and the shaping column is supported between the shaping plate and the bottom of the cavity shell.

[0016] During the reference surface machining process, a shaping plunger is inserted into the cavity shell to shape the cavity shell to prevent deformation of the irregular thin-walled blank during the machining process.

[0017] Preferably, in S4 and S7, the blank is clamped on a front jig, the front jig includes a connecting plate and a zero-position plate, the reference surface of the blank is abutted against the surface of the connecting plate, the blank and the connecting plate are fastened with screws, and the connecting plate is fastened to the zero-position plate.

[0018] When semi-finishing and finishing the bottom surface and cavity surface of the blank, the blank is loaded and positioned on the front fixture. The reference surface on the blank is fitted with the surface of the connecting plate and fastened with screws. The connecting plate is fastened to the zero-position plate, and the positioning of the processing process is accurate and reliable.

[0019] Preferably, a plurality of clamping blocks are fastened to the connecting plate, and clamping blocks are engaged on both the upper and lower sides of the blank.

[0020] The setting of the clamping block improves the stability of the clamping of the blank.

[0021] Preferably, in S5 and S8, the blank is clamped on a reverse fixture, the reverse fixture includes a mounting plate and a zero point plate, the front end face of the blank is against the surface of the mounting plate, the blank and the mounting plate are fastened with screws, and the mounting plate is fastened to the zero point plate.

[0022] When semi-finishing and finishing are performed on the reverse side of the cavity surface of the blank, the blank is loaded and positioned on the reverse side fixture, the front end face of the blank is abutted against the surface of the mounting plate and fastened by screws, and the mounting plate is fastened to the zero point plate, and the processing process is accurate and reliable.

[0023] Preferably, after S5, the blank is removed and left to stand for a period of time to release the semi-finishing stress and deformation.

[0024] After semi-finishing, the blank is left to rest to release stress and deformation.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the processing technology of the special-shaped thin-walled parts in the patent application makes the special-shaped thin-walled parts less likely to deform during the processing, thereby ensuring the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of a blank of the present invention.

[0027] Figure 2 This is a reference surface machining and clamping diagram of Example 1 of the present invention.

[0028] Figure 3 It is a schematic diagram of the front jig of the present invention.

[0029] Figure 4 It is a schematic diagram of the reverse side fixture of the present invention.

[0030] Figure 5 This is a reference surface machining and clamping diagram of Example 2 of the present invention.

[0031] Figure 6 This is a reference surface machining and clamping diagram of Example 3 of the present invention.

[0032] In the figure: 1, blank, 2, reference surface, 3, transition plate, 4, bottom plate, 5, cavity shell, 6, connecting seat, 7, through groove, 8, shaping plate, 9, shaping column, 10, filling body, 11, support plate, 12, support rod, 13, bottom surface, 14, cavity surface, 15, connecting plate, 16, zero position plate, 17, clamping block, 18, mounting plate, 19, zero point plate. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: A processing technology for a special-shaped thin-walled part (see attached Figure 1 To Attachment Figure 4 ), comprising the following steps: S1, roughing the blank to form a blank part 1; in S1, the blank is roughed but a 2.5-3.5mm margin is reserved on the surface. In this embodiment, the blank is roughed but a 3mm margin is reserved on the surface. The entire roughing process is carried out on a CNC lathe, and the process holes are processed during the roughing process.

[0034] S2, heat treatment of blank 1; S2 heat treatment temperature of blank 1 is 195-205°C, time is 9-11 hours, and natural cooling is performed. In this embodiment, blank 1 is loaded into a heat treatment furnace for heat treatment at a temperature of 200°C for 10 hours to remove the stress generated by roughing.

[0035] S3, the reference surface 2 is processed on the blank 1, and the blank 1 is glued to the transition plate 3 during processing; the blank 1 includes a bottom plate 4 and a cavity shell 5, a connecting seat 6 is arranged between the bottom plate 4 and the cavity shell 5, the bottom plate 4 is glued to the transition plate 3, and the reference surface 2 is arranged on the outer bottom surface 13 of the cavity shell 5. A through groove 7 is arranged on the surface of the bottom plate 4, and a positioning block is installed on the transition plate 3, and the positioning block is adapted to be inserted into the through groove 7. Before the reference surface 2 of the blank 1 is processed, hot melt adhesive is first applied between the bottom plate 4 and the transition plate 3 of the blank 1, and then the bottom plate 4 and the transition plate 3 are glued together, and the positioning block on the transition plate 3 is correspondingly inserted into the through groove 7 to achieve precise positioning. Three through grooves 7 are arranged on the bottom plate 4, the middle through groove 7 is connected to the cavity shell 5, and the through grooves 7 on both sides extend into the connecting seat 6. The transition plate 3 is fastened to the clamping seat of the vertical machine tool, a zero-point tooling is arranged on the clamping seat, and the transition plate 3 is connected to the zero-point tooling. The flatness of the reference surface 2 after machining is within 0.02.

[0036] S4, semi-finishing the bottom surface 13 and cavity surface 14 of the blank 1; during processing, the blank 1 is clamped on the front fixture, the front fixture includes a connecting plate 15 and a zero-position plate 16, the reference surface 2 of the blank 1 is against the surface of the connecting plate 15, the blank 1 and the connecting plate 15 are screwed, and the connecting plate 15 is fastened to the zero-position plate 16. A number of clamping blocks 17 are fastened to the connecting plate 15, and clamping blocks 17 are against the upper and lower sides of the blank 1. In this embodiment, two clamping blocks 17 are provided, and the two clamping blocks 17 are clamped on the upper and lower sides of the connecting seat 6 respectively. The bottom surface 13 is the outer surface of the bottom plate 4, and the cavity surface 14 faces all surfaces of the cavity shell 5. The zero-position plate 16 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes semi-finishing of all surfaces on the bottom surface 13 and cavity surface 14 side of the blank 1.

[0037] S5, semi-finishing the reverse side of the cavity surface 14 of the blank 1; the blank 1 is clamped on the reverse side fixture, the reverse side fixture includes a mounting plate 18 and a zero point plate 19, the front end face of the blank 1 is fitted on the surface of the mounting plate 18, the blank 1 and the mounting plate 18 are fastened with screws, and the mounting plate 18 is fastened to the zero point plate 19. The reverse side of the cavity surface 14 of the blank 1 is all surfaces facing away from the cavity shell 5. The zero point plate 19 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes semi-finishing of all surfaces on the reverse side of the cavity surface 14 of the blank 1. Remove the blank 1 and let it stand for a period of time to release the semi-finishing stress and deformation. In this embodiment, the blank 1 is removed and left to stand for 24 hours.

[0038] S6, repeat S3.

[0039] S7, finish machining the bottom surface 13 and the cavity surface 14; during machining, the blank 1 is clamped on the front fixture, the front fixture includes a connecting plate 15 and a zero-position plate 16, the reference surface 2 of the blank 1 is against the surface of the connecting plate 15, the blank 1 and the connecting plate 15 are screwed, and the connecting plate 15 is fastened to the zero-position plate 16. A number of clamping blocks 17 are fastened to the connecting plate 15, and clamping blocks 17 are against the upper and lower sides of the blank 1. In this embodiment, two clamping blocks 17 are provided, the upper and lower blocks 17, and the two clamping blocks 17 are clamped on the upper and lower sides of the connecting seat 6, respectively. The bottom surface 13 is the outer surface of the bottom plate 4, and the cavity surface 14 faces all surfaces of the cavity shell 5. The zero-position plate 16 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes the finish machining of all surfaces on the bottom surface 13 and the cavity surface 14 side of the blank 1.

[0040] S8, finish machining the reverse side of the cavity surface 14 of the blank 1; the blank 1 is clamped on the reverse side fixture, the reverse side fixture includes a mounting plate 18 and a zero point plate 19, the front end face of the blank 1 is close to the surface of the mounting plate 18, the blank 1 and the mounting plate 18 are screwed, and the mounting plate 18 is fastened to the zero point plate 19. The reverse side of the cavity surface 14 of the blank 1 is all surfaces facing away from the cavity shell 5. The zero point plate 19 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes the finish machining of all surfaces of the reverse side of the cavity surface 14 of the blank 1.

[0041] S9, finish machining the reverse side of the bottom surface 13; the reverse side of the bottom surface 13 is the inner surface of the bottom plate 4. The bottom plate 4 of the blank 1 is connected to the transition plate 3, and then the transition plate 3 is connected to the vertical machine tool, and the vertical machine tool realizes finish machining of the reverse side of the bottom surface 13 of the blank 1.

[0042] S10, machining the undercut feature in the upper cavity of the blank 1. The reference surface 2 of the blank 1 is aligned with the surface of the transition plate 3, the blank 1 and the transition plate 3 are fastened by screws, and then the transition plate 3 is connected to the vertical machine tool, and the vertical machine tool realizes the machining of the undercut feature in the upper cavity of the blank 1.

[0043] During the processing of special-shaped thin-walled parts, heat treatment is performed to relieve stress after roughing. When processing the reference surface 2, the blank 1 is glued to the transition plate 3, and the positioning is reliable. The special-shaped thin-walled blank 1 is not easy to deform. During machining, semi-finishing is performed first, and then finishing is performed to ensure the accuracy of the processing. Moreover, the reference surface 2 is processed before semi-finishing and finishing, and the processing is more accurate to ensure the processing quality.

[0044] Example 2: A processing technology for a special-shaped thin-walled part (see attached Figure 1 , Attachment Figure 3 , Attachment Figure 4 , Attachment Figure 5), comprising the following steps: S1, roughing the blank to form a blank part 1; in S1, the blank is roughed but a 2.5-3.5mm margin is reserved on the surface. In this embodiment, the blank is roughed but a 3mm margin is reserved on the surface. The entire roughing process is carried out on a CNC lathe, and the process holes are processed during the roughing process.

[0045] S2, heat treatment of blank 1; S2 heat treatment temperature of blank 1 is 195-205°C, time is 9-11 hours, and natural cooling is performed. In this embodiment, blank 1 is loaded into a heat treatment furnace for heat treatment at a temperature of 200°C for 10 hours to remove the stress generated by roughing.

[0046] S3, the reference surface 2 is processed on the blank 1, and the blank 1 is glued to the transition plate 3 during processing; the blank 1 includes a bottom plate 4 and a cavity shell 5, a connecting seat 6 is arranged between the bottom plate 4 and the cavity shell 5, the bottom plate 4 is glued to the transition plate 3, and the reference surface 2 is arranged on the outer bottom surface 13 of the cavity shell 5. A through groove 7 is arranged on the surface of the bottom plate 4, and a positioning block is installed on the transition plate 3, and the positioning block is adapted to be inserted into the through groove 7. A shaping plate 8 is arranged below the cavity shell 5, and a shaping column 9 is adapted to be loaded in the cavity shell 5, and the shaping column 9 is supported between the shaping plate 8 and the bottom of the cavity shell 5. The shaping column 9 is a hard column, and the shaping plate 8 is fixedly connected to the transition plate 3. Before the reference surface 2 of the blank 1 is processed, hot melt adhesive is first applied between the bottom plate 4 and the transition plate 3 of the blank 1, and then the bottom plate 4 and the transition plate 3 are glued together, and the positioning block on the transition plate 3 is correspondingly inserted into the through groove 7 to achieve precise positioning. Three through slots 7 are arranged on the bottom plate 4, the middle through slot 7 is connected to the cavity shell 5, and the through slots 7 on both sides extend into the connecting seat 6. The shaping column 9 is installed into the cavity shell 5 so that the shaping column 9 is supported between the shaping plate 8 and the bottom of the cavity shell 5. The transition plate 3 is fastened to the clamping seat of the vertical machine tool, a zero-point fixture is arranged on the clamping seat, and the transition plate 3 is connected to the zero-point fixture. The flatness of the reference surface 2 after machining is within 0.02. During the machining of the reference surface 2, the shaping column 9 is inserted into the cavity shell 5 to shape the cavity shell 5 to prevent the deformation of the irregular thin-walled blank 1 during the machining process.

[0047] S4, semi-finishing the bottom surface 13 and cavity surface 14 of the blank 1; during processing, the blank 1 is clamped on the front fixture, the front fixture includes a connecting plate 15 and a zero-position plate 16, the reference surface 2 of the blank 1 is against the surface of the connecting plate 15, the blank 1 and the connecting plate 15 are screwed, and the connecting plate 15 is fastened to the zero-position plate 16. A number of clamping blocks 17 are fastened to the connecting plate 15, and clamping blocks 17 are against the upper and lower sides of the blank 1. In this embodiment, two clamping blocks 17 are provided, and the two clamping blocks 17 are clamped on the upper and lower sides of the connecting seat 6 respectively. The bottom surface 13 is the outer surface of the bottom plate 4, and the cavity surface 14 faces all surfaces of the cavity shell 5. The zero-position plate 16 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes semi-finishing of all surfaces on the bottom surface 13 and cavity surface 14 side of the blank 1.

[0048] S5, semi-finishing the reverse side of the cavity surface 14 of the blank 1; the blank 1 is clamped on the reverse side fixture, the reverse side fixture includes a mounting plate 18 and a zero point plate 19, the front end face of the blank 1 is fitted on the surface of the mounting plate 18, the blank 1 and the mounting plate 18 are fastened with screws, and the mounting plate 18 is fastened to the zero point plate 19. The reverse side of the cavity surface 14 of the blank 1 is all surfaces facing away from the cavity shell 5. The zero point plate 19 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes semi-finishing of all surfaces on the reverse side of the cavity surface 14 of the blank 1. Remove the blank 1 and let it stand for a period of time to release the semi-finishing stress and deformation. In this embodiment, the blank 1 is removed and left to stand for 24 hours.

[0049] S6, repeat S3.

[0050] S7, finish machining the bottom surface 13 and the cavity surface 14; during machining, the blank 1 is clamped on the front fixture, the front fixture includes a connecting plate 15 and a zero-position plate 16, the reference surface 2 of the blank 1 is against the surface of the connecting plate 15, the blank 1 and the connecting plate 15 are screwed, and the connecting plate 15 is fastened to the zero-position plate 16. A number of clamping blocks 17 are fastened to the connecting plate 15, and clamping blocks 17 are against the upper and lower sides of the blank 1. In this embodiment, two clamping blocks 17 are provided, the upper and lower blocks 17, and the two clamping blocks 17 are clamped on the upper and lower sides of the connecting seat 6, respectively. The bottom surface 13 is the outer surface of the bottom plate 4, and the cavity surface 14 faces all surfaces of the cavity shell 5. The zero-position plate 16 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes the finish machining of all surfaces on the bottom surface 13 and the cavity surface 14 side of the blank 1.

[0051] S8, finish machining the reverse side of the cavity surface 14 of the blank 1; the blank 1 is clamped on the reverse side fixture, the reverse side fixture includes a mounting plate 18 and a zero point plate 19, the front end face of the blank 1 is close to the surface of the mounting plate 18, the blank 1 and the mounting plate 18 are screwed, and the mounting plate 18 is fastened to the zero point plate 19. The reverse side of the cavity surface 14 of the blank 1 is all surfaces facing away from the cavity shell 5. The zero point plate 19 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes the finish machining of all surfaces of the reverse side of the cavity surface 14 of the blank 1.

[0052] S9, finish machining the reverse side of the bottom surface 13; the reverse side of the bottom surface 13 is the inner surface of the bottom plate 4. The bottom plate 4 of the blank 1 is connected to the transition plate 3, and then the transition plate 3 is connected to the vertical machine tool, and the vertical machine tool realizes finish machining of the reverse side of the bottom surface 13 of the blank 1.

[0053] S10, machining the undercut feature in the upper cavity of the blank 1. The reference surface 2 of the blank 1 is aligned with the surface of the transition plate 3, the blank 1 and the transition plate 3 are fastened by screws, and then the transition plate 3 is connected to the vertical machine tool, and the vertical machine tool realizes the machining of the undercut feature in the upper cavity of the blank 1.

[0054] During the processing of special-shaped thin-walled parts, heat treatment is performed to relieve stress after roughing. When processing the reference surface 2, the blank 1 is glued to the transition plate 3, and the positioning is reliable. The special-shaped thin-walled blank 1 is not easy to deform. During machining, semi-finishing is performed first, and then finishing is performed to ensure the accuracy of the processing. Moreover, the reference surface 2 is processed before semi-finishing and finishing, and the processing is more accurate to ensure the processing quality.

[0055] Example 3: A processing technology for a special-shaped thin-walled part (see attached Figure 1 , Attachment Figure 3 , Attachment Figure 4 , Attachment Figure 6 ), comprising the following steps: S1, roughing the blank to form a blank part 1; in S1, the blank is roughed but a 2.5-3.5mm margin is reserved on the surface. In this embodiment, the blank is roughed but a 3mm margin is reserved on the surface. The entire roughing process is carried out on a CNC lathe, and the process holes are processed during the roughing process.

[0056] S2, heat treatment of blank 1; S2 heat treatment temperature of blank 1 is 195-205°C, time is 9-11 hours, and natural cooling is performed. In this embodiment, blank 1 is loaded into a heat treatment furnace for heat treatment at a temperature of 200°C for 10 hours to remove the stress generated by roughing.

[0057] S3, a reference surface 2 is processed on the blank 1, and the blank 1 is glued to the transition plate 3 during processing; the blank 1 includes a bottom plate 4 and a cavity shell 5, a connecting seat 6 is arranged between the bottom plate 4 and the cavity shell 5, the bottom plate 4 is glued to the transition plate 3, and the reference surface 2 is arranged on the outer bottom surface 13 of the cavity shell 5. A through groove 7 is arranged on the surface of the bottom plate 4, and a positioning block is installed on the transition plate 3, and the positioning block is adapted to be inserted into the through groove 7. A shaping plate 8 is arranged below the cavity shell 5, and a shaping column 9 is adapted to be loaded inside the cavity shell 5, and the shaping column 9 is supported between the shaping plate 8 and the bottom of the cavity shell 5. The shaping plate 8 is fixedly connected to the transition plate 3. The shaping column 9 includes a skeleton and a filling body 10, and the skeleton includes a support plate 11 and a plurality of support rods 12, one end of the support rod 12 is connected to the support plate 11, and the other end of the support rod 12 is close to the bottom of the cavity shell 5, and the filling body 10 is made of glue or hot melt adhesive, which can fill the interior of the cavity shell 5. Before the reference surface 2 is processed, the blank 1 is first smeared with hot melt adhesive between the bottom plate 4 and the transition plate 3 of the blank 1, and then the bottom plate 4 and the transition plate 3 are glued together, and the positioning block on the transition plate 3 is inserted into the corresponding through slot 7 to achieve precise positioning. Three through slots 7 are set on the bottom plate 4, the middle through slot 7 is connected to the cavity shell 5, and the through slots 7 on both sides extend into the connecting seat 6. The filling body 10 is loaded into the cavity shell 5, and the skeleton is inserted into the cavity shell 5, so as to form a shaping column 9 in the cavity shell 5, and the shaping column 9 is supported between the shaping plate 8 and the bottom of the cavity shell 5. The transition plate 3 is fastened to the clamping seat of the vertical machine tool, and a zero-point tooling is set on the clamping seat, and the transition plate 3 is connected to the zero-point tooling. The flatness of the reference surface 2 after processing is within 0.02. During the processing of the reference surface 2, the shaping column 9 is inserted into the cavity shell 5 to shape the cavity shell 5 to prevent the irregular thin-walled blank 1 from deforming during the processing. The shaping column 9 is composed of a frame and a filling body 10 . The filling body 10 is flexible and can be deformed so as to fill every position in the cavity shell 5 . The shaping effect on the cavity shell 5 is good and the blank 1 is not easily deformed during the processing.

[0058] S4, semi-finishing the bottom surface 13 and cavity surface 14 of the blank 1; during processing, the blank 1 is clamped on the front fixture, the front fixture includes a connecting plate 15 and a zero-position plate 16, the reference surface 2 of the blank 1 is against the surface of the connecting plate 15, the blank 1 and the connecting plate 15 are screwed, and the connecting plate 15 is fastened to the zero-position plate 16. A number of clamping blocks 17 are fastened to the connecting plate 15, and clamping blocks 17 are against the upper and lower sides of the blank 1. In this embodiment, two clamping blocks 17 are provided, and the two clamping blocks 17 are clamped on the upper and lower sides of the connecting seat 6 respectively. The bottom surface 13 is the outer surface of the bottom plate 4, and the cavity surface 14 faces all surfaces of the cavity shell 5. The zero-position plate 16 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes semi-finishing of all surfaces on the bottom surface 13 and cavity surface 14 side of the blank 1.

[0059] S5, semi-finishing the reverse side of the cavity surface 14 of the blank 1; the blank 1 is clamped on the reverse side fixture, the reverse side fixture includes a mounting plate 18 and a zero point plate 19, the front end face of the blank 1 is fitted on the surface of the mounting plate 18, the blank 1 and the mounting plate 18 are fastened with screws, and the mounting plate 18 is fastened to the zero point plate 19. The reverse side of the cavity surface 14 of the blank 1 is all surfaces facing away from the cavity shell 5. The zero point plate 19 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes semi-finishing of all surfaces on the reverse side of the cavity surface 14 of the blank 1. Remove the blank 1 and let it stand for a period of time to release the semi-finishing stress and deformation. In this embodiment, the blank 1 is removed and left to stand for 24 hours.

[0060] S6, repeat S3.

[0061] S7, finish machining the bottom surface 13 and the cavity surface 14; during machining, the blank 1 is clamped on the front fixture, the front fixture includes a connecting plate 15 and a zero-position plate 16, the reference surface 2 of the blank 1 is against the surface of the connecting plate 15, the blank 1 and the connecting plate 15 are screwed, and the connecting plate 15 is fastened to the zero-position plate 16. A number of clamping blocks 17 are fastened to the connecting plate 15, and clamping blocks 17 are against the upper and lower sides of the blank 1. In this embodiment, two clamping blocks 17 are provided, the upper and lower blocks 17, and the two clamping blocks 17 are clamped on the upper and lower sides of the connecting seat 6, respectively. The bottom surface 13 is the outer surface of the bottom plate 4, and the cavity surface 14 faces all surfaces of the cavity shell 5. The zero-position plate 16 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes the finish machining of all surfaces on the bottom surface 13 and the cavity surface 14 side of the blank 1.

[0062] S8, finish machining the reverse side of the cavity surface 14 of the blank 1; the blank 1 is clamped on the reverse side fixture, the reverse side fixture includes a mounting plate 18 and a zero point plate 19, the front end face of the blank 1 is close to the surface of the mounting plate 18, the blank 1 and the mounting plate 18 are screwed, and the mounting plate 18 is fastened to the zero point plate 19. The reverse side of the cavity surface 14 of the blank 1 is all surfaces facing away from the cavity shell 5. The zero point plate 19 is connected to the clamping seat of the horizontal machining center, and the horizontal machining center realizes the finish machining of all surfaces of the reverse side of the cavity surface 14 of the blank 1.

[0063] S9, finish machining the reverse side of the bottom surface 13; the reverse side of the bottom surface 13 is the inner surface of the bottom plate 4. The bottom plate 4 of the blank 1 is connected to the transition plate 3, and then the transition plate 3 is connected to the vertical machine tool, and the vertical machine tool realizes finish machining of the reverse side of the bottom surface 13 of the blank 1.

[0064] S10, machining the undercut feature in the upper cavity of the blank 1. The reference surface 2 of the blank 1 is aligned with the surface of the transition plate 3, the blank 1 and the transition plate 3 are fastened by screws, and then the transition plate 3 is connected to the vertical machine tool, and the vertical machine tool realizes the machining of the undercut feature in the upper cavity of the blank 1.

[0065] During the processing of special-shaped thin-walled parts, heat treatment is performed to relieve stress after roughing. When processing the reference surface 2, the blank 1 is glued to the transition plate 3, and the positioning is reliable. The special-shaped thin-walled blank 1 is not easy to deform. During machining, semi-finishing is performed first, and then finishing is performed to ensure the accuracy of the processing. Moreover, the reference surface 2 is processed before semi-finishing and finishing, and the processing is more accurate to ensure the processing quality.

[0066] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A processing technology for special-shaped thin-walled parts, characterized in that: The following steps are involved: S1, roughing the blank to form a blank; S2, heat treatment of the blank; S3, machining the reference surface on the blank, and gluing the blank to the transition plate during machining; S4, semi-finishing the bottom surface and cavity surface of the blank; S5, semi-finishing the reverse side of the cavity surface of the blank; S6, repeating S3; S7, finishing the bottom surface and cavity surface; S8, finishing the reverse side of the cavity surface of the blank; S9, finishing the reverse side of the bottom surface; S10, machining the undercut feature in the cavity of the blank.

2. The processing technology of a special-shaped thin-walled part according to claim 1 is characterized in that: In S1, the blank is roughened but a 2.5-3.5mm margin is reserved on the surface.

3. The processing technology of a special-shaped thin-walled part according to claim 1 is characterized in that: The S2 blank is heat treated at 195-205°C for 9-11 hours and then cooled naturally.

4. The processing technology of a special-shaped thin-walled part according to claim 1 is characterized in that: The blank comprises a bottom plate and a cavity shell, a connecting seat is arranged between the bottom plate and the cavity shell, the bottom plate is glued on the transition plate, and the reference surface is arranged on the outer bottom surface of the cavity shell.

5. The processing technology of a special-shaped thin-walled part according to claim 4 is characterized in that: A through slot is arranged on the surface of the bottom plate, a positioning block is installed on the transition plate, and the positioning block is adapted to be inserted into the through slot.

6. The processing technology of a special-shaped thin-walled part according to claim 4 is characterized in that: A shaping plate is arranged below the cavity shell, and a shaping column is adapted to be loaded in the cavity shell, and the shaping column is supported between the shaping plate and the bottom of the cavity shell.

7. The processing technology of a special-shaped thin-walled part according to claim 1 is characterized in that: During S4 and S7, the blank is clamped on the front fixture, which includes a connecting plate and a zero-position plate. The reference surface of the blank is against the surface of the connecting plate. The blank and the connecting plate are fastened with screws, and the connecting plate is fastened to the zero-position plate.

8. The processing technology of a special-shaped thin-walled part according to claim 7 is characterized in that: A plurality of clamping blocks are fastened to the connecting plate, and clamping blocks are fitted on both upper and lower sides of the blank.

9. The processing technology of a special-shaped thin-walled part according to claim 1 is characterized in that: During S5 and S8, the blank is clamped on the reverse fixture, which includes a mounting plate and a zero point plate. The front end face of the blank is against the surface of the mounting plate, the blank and the mounting plate are fastened with screws, and the mounting plate is fastened to the zero point plate.

10. A processing technology for special-shaped thin-walled parts according to any one of claims 1 to 9, characterized in that: After S5, the blank is removed and left to stand for a while to release the semi-finishing stress and deformation.

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