Finishing system for large titanium alloy thin-walled workpiece after chemical milling

Abstract

The invention provides a finishing system for a large titanium alloy thin-wall part after chemical milling, and relates to the field of metal material surface treatment.The finishing system comprises a base and a supporting frame assembly, the base and the supporting frame assembly are connected with a lifting frame assembly through a lifting assembly, and a spindle box assembly and a center box assembly are fixed to the lifting frame assembly; the material box assembly is arranged in the base and supporting frame assembly and connected with the material box driving assembly, the automatic feeding and discharging assembly is arranged at the upper end of the material box driving assembly, and the material box assembly is connected with the material circulation assembly. The special vibration finishing system which is specially designed is used for finishing process machining of large-scale casing type, disc shaft type or columnar workpieces, automatic machining of the workpieces of different specifications or different shapes is achieved, edges, burrs, corrosion layers and bumping damage on the surfaces of the workpieces are removed, the surface roughness, surface smoothness and edge roundness of the workpieces are improved, and the production efficiency is improved. And the purpose of finishing is achieved.

Description

Technical Field

[0001] The invention relates to the field of metal material surface treatment, in particular to a finishing system for large titanium alloy thin-walled parts after chemical milling. Background Art

[0002] With the improvement of engine iteration and function, the components of the fourth-generation and above aircraft engines are developing in the direction of larger size and lighter weight. The casing parts of a certain fighter have been adjusted from the original steel structure to titanium alloy materials. Since casing parts are thin-walled parts, titanium alloy thin-walled parts are very easy to deform during the machining process due to the large machining stress. Especially in the subsequent use process, the high-speed rotating blades will be damaged by wear due to the deformation of the casing. Therefore, a non-mechanical method, chemical milling, is adopted for the wall thinning of titanium alloy parts. Chemical milling is a chemical corrosion processing method, that is, titanium alloy parts are partially coated with glue for protection, immersed in a special corrosion tank liquid, and the part to be processed is milled away by chemical reagent corrosion.

[0003] After chemical milling of ultra-large titanium alloy thin-walled parts for aircraft engines, the remaining corroded surface is equivalent to an incomplete surface of the part with notches. Titanium alloy parts are extremely sensitive to notches. The presence of the corroded surface can easily cause delayed fatigue fracture during the use of the parts, causing accidents. Therefore, it is necessary to remove burrs and corrosion surface defects on the surface before delivery. Because the remaining corroded surface is equivalent to an incomplete surface of the part with notches, titanium alloy parts are extremely sensitive to notches. The presence of the corroded surface can easily cause delayed fatigue fracture during the use of the parts, causing accidents.

[0004] However, due to the large size of the parts, the size of domestic vibration finishing equipment is limited, and it is impossible to bury the parts in abrasives and use vibration abrasives to remove burrs and corroded surfaces. At present, after chemical milling of titanium alloy thin-walled parts, manual grinding has been used to remove burrs and corroded surfaces. This method not only increases the labor intensity of manual labor, but also has extremely low work efficiency. The grinding process is prone to overheating of the part surface and uneven removal of thickness, which has serious defects that restrict the progress of engine delivery. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention proposes a finishing system for large titanium alloy thin-walled parts after chemical milling, so as to solve the problem that due to the particularly large size of super-large titanium alloy thin-walled parts of aircraft engines, after chemical milling of titanium alloy thin-walled parts, manual grinding is used to remove surface burrs and corrosion surfaces. This method has high labor intensity and extremely low work efficiency. In addition, the grinding process is prone to cause overheating of the part surface and uneven removal thickness, which seriously restricts the engine delivery progress; it realizes the automated processing of workpieces of different specifications and shapes to remove edges, burrs, corrosion layers and dents on the workpiece surface, reduce the surface roughness of the workpiece, improve the surface smoothness and edge roundness of the workpiece, and achieve the purpose of finishing and finishing.

[0006] In view of this, the present invention provides a finishing system for large titanium alloy thin-walled parts after chemical milling, comprising a base and support frame assembly, a lifting assembly, a lifting frame assembly, a spindle box assembly, a center box assembly, a material box assembly, a material box drive assembly, an automatic loading and unloading assembly and a material circulation assembly; the base and support frame assembly and the lifting frame assembly are connected via the lifting assembly, the spindle box assembly and the center box assembly are fixed on the lifting frame assembly, the material box assembly is arranged inside the base and support frame assembly, one side of the material box assembly is connected to the material box drive assembly, the upper end of the material box drive assembly is provided with an automatic loading and unloading assembly, and the other side of the material box assembly is connected to the material circulation assembly.

[0007] The base and support frame assembly include a base assembly and a support frame assembly, the support frame assembly is arranged at the upper end of the base assembly; the base assembly includes a bottom plate and side supports, side supports are longitudinally arranged on both side edges of the bottom plate, and a support beam is connected in the middle of the side supports on both sides; the support frame assembly includes a support frame, a support side frame and a lifting frame slide rail, a support frame is connected in the middle of two of the support side frames, the lower end of the support frame is connected to the support beam, the lower ends of the two support side frames are respectively connected to the upper ends of the side supports, and the lifting frame slide rail is arranged on the side of the lifting frame.

[0008] A screw lift is arranged in the side support, and two ends of the screw lift are respectively arranged on the bottom plate and the upper end of the side support, and a limit block is arranged on the upper end of the screw lift.

[0009] The lifting frame assembly includes a lifting frame body, a clamping synchronization system and a transition plate, and the transition plate is arranged inside the lifting frame body through the clamping synchronization system; the spindle box assembly includes a spindle box body and a spindle motor arranged on the spindle box body, and the spindle box body is connected to a transition plate; the center box assembly includes a center box body, which is symmetrically arranged on the other transition plate.

[0010] The material box assembly includes a mounting bracket, a material box, a water outlet and a material discharge port. The mounting bracket is connected to the material box drive assembly. The material box is arranged at the upper end of the mounting bracket, and the water outlet and the material discharge port are opened at the bottom end of the material box.

[0011] The material box driving assembly includes a casting stand, a driving motor, a slewing support and a transition connecting rod. The slewing support is rotatably connected to the casting stand, and the driving motor is connected to the transition connecting rod through the slewing support.

[0012] The automatic loading and unloading assembly includes a second slide rail, a fork bracket and a servo drive system. The second slide rail is arranged at the upper end of the material box drive assembly, the fork bracket is slidably connected to the second slide rail, and the second slide rail is connected to the servo drive system.

[0013] The material circulation assembly includes a linear vibrating screen and an abrasive elevator. One end of the linear vibrating screen is connected to the bottom of the material box assembly, and the other end is connected to the bottom end of the abrasive elevator. The top of the abrasive elevator is provided with a discharge port, and the discharge port faces the inside of the material box assembly.

[0014] The finishing system after chemical milling of large thin-walled titanium alloy parts also includes a lifting crane, which includes a hydraulic mechanism, a hook and a suspension rod. One end of the hydraulic mechanism is connected to the base of the lifting crane, and the other end is connected to the suspension rod. A hook is provided at the lower end of the suspension rod.

[0015] The finishing system after chemical milling of large thin-walled titanium alloy parts also includes a water circulation system, which includes a water tank, a filter device and a pneumatic diaphragm pump; the water tank includes a clean water tank and a sewage tank, and the inside of the clean water tank and the inside of the sewage tank are connected through an overflow tank; the outside of the clean water tank is connected to the outside of the sewage tank through a filter device and a pneumatic diaphragm pump; the clean water tank is connected to circulating water supply and clean water tank drainage, and the sewage tank is connected to circulating return water and sewage tank drainage; the circulating water supply and circulating return water are respectively connected to the material box assembly.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention is a special vibration finishing system specially designed including a base and support frame assembly, a lifting assembly, a lifting frame assembly, a spindle box assembly, a center box assembly, a material box assembly, a material box drive assembly, an automatic loading and unloading assembly and a material circulation assembly. It is used for the finishing process of large-scale casings, disk shafts or cylindrical workpieces, and realizes the automated processing of workpieces of different specifications and / or different shapes, rounding the edges of the workpiece surface, removing burrs, corrosion layers and bumps on the workpiece surface, reducing the surface roughness of the workpiece, improving the surface finish and edge roundness of the workpiece, and achieving the purpose of finishing and finishing.

[0018] 2. The present invention uses the screw lifter and the limit block provided on its upper end to adjust the position of the lifting frame assembly to avoid the different diameters of workpieces being too close or too far from the bottom of the material box, thereby affecting the finishing and polishing process effect.

[0019] 3. In the present invention, the synchronization of the spindle box assembly and the center box assembly is guaranteed by the clamping synchronization system, so that the workpiece can rotate smoothly.

[0020] 4. The present invention adopts a short-distance throwing form through the material backfilling method in the material circulation assembly, and directly sprays the abrasive onto the workpiece surface, which generates compressive stress on the workpiece surface, further improves the corrosion resistance of the workpiece surface, improves the fatigue strength and contact endurance of the workpiece, and achieves the strengthening effect of the workpiece surface.

[0021] 5. The present invention performs finishing of the workpiece by combining the forward or reverse rotation of the workpiece itself with the linear reciprocating motion of the material box assembly, thereby enhancing the finishing effect of the workpiece surface.

[0022] 6. The finishing system of the present invention has stable processing effect, low cost, simple operation, removes the residual tensile stress on the surface after machining, and forms residual compressive stress. It is an ideal finishing equipment for processing the chamfering or rounding of the sharp edges of the casing shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the base assembly structure of the present invention; Figure 3 It is a schematic diagram of the support frame assembly structure of the present invention; Figure 4 It is a schematic diagram of the lifting frame assembly structure of the present invention; Figure 5 It is a schematic diagram of the structure of the spindle box assembly of the present invention; Figure 6 It is a schematic diagram of the structure of the material box assembly of the present invention; Figure 7 It is a schematic diagram of the structure of the material box drive assembly of the present invention; Figure 8 It is a schematic diagram of the automatic loading and unloading assembly structure of the present invention; Fig. 9 It is a schematic diagram of the material circulation assembly structure of the present invention; Fig.10 It is a schematic diagram of the structure of the lifting crane of the present invention; Fig.11 It is a schematic diagram of the water circulation system structure of the present invention; Fig.12 It is a schematic diagram of the first operation step of the finishing system of the present invention; Fig.13 It is a schematic diagram of the second operation step of the finishing system of the present invention; Fig.14 It is a schematic diagram of the fifth operation step of the finishing system of the present invention; Fig.15 It is a schematic diagram of the sixth operation step of the finishing system of the present invention; Fig.16 (a) is an enlarged schematic diagram of the intersection of edges of the workpiece before finishing of the present invention; Fig.16 (b) is an enlarged schematic diagram of the intersection of the edges of the workpiece of the present invention after finishing for 2 hours; Fig.16 (c) is an enlarged schematic diagram of the intersection position of the edges of the workpiece of the present invention after finishing for 4 hours; Fig.17 (a) is a schematic diagram of the surface texture state of the concave surface of the workpiece before finishing of the present invention; Fig.17 (b) is a schematic diagram of the surface texture state of the concave surface of the workpiece after finishing for 4 hours; Fig.18 (a) is a schematic diagram of the surface texture state of the workpiece edge surface before finishing of the present invention; Fig.18 (b) is a schematic diagram of the surface texture state of the workpiece edge surface after 4 hours of polishing; Fig.19 (a) is a schematic diagram of the surface texture state of the workpiece upper surface before finishing of the present invention; Fig.19 (b) is a schematic diagram of the surface texture state of the workpiece after finishing for 4 hours; In the figure: 1. Base and support frame assembly; 11. Base assembly; 111. Bottom plate; 112. Side support; 113. Support beam; 114. Screw lift; 115. Limit block; 12. Support frame assembly; 121. Support frame; 122. Support side frame; 123. Lifting frame slide rail; 2. Lifting assembly; 21. Hydraulic cylinder; 3. Lifting frame assembly; 31. Lifting frame body; 311. Upper V-shaped block; 32. Clamping synchronization system; 321. Clamping cylinder; 33. Transition plate; 4. Spindle box assembly; 41. Spindle box body; 42. Spindle motor; 43. Output spindle; 5. Center box assembly; 6. Material box assembly; 61. Mounting bracket; 62. Material box; 7. Material box drive assembly; 71. Casting stand; 72. Drive motor; 73. Slewing support; 74. Transition connecting rod; 8. Automatic loading and unloading assembly; 81. Slide rail 2; 82. Fork bracket; 83. Servo drive system; 84. Receiving tray; 85. Lifting crane; 851. Hydraulic mechanism; 852. Hook; 853. Hanging rod; 9. Material circulation assembly; 91. Linear vibrating screen; 92. Abrasive hoist; 93. Discharge port; 94. Waste discharge port; 95. Waste recovery box; 1011. Water tank; 1012. Filter device 1; 1013. Pneumatic diaphragm pump; 1014. Overflow tank; 1015. Circulating water supply; 1016. Clean water tank drainage; 1017. Circulating return water; 1018. Sewage tank drainage. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] See also Figure 1 As shown, a finishing system for large titanium alloy thin-walled parts after chemical milling of the present invention comprises a base and support frame assembly 1, a lifting assembly 2, a lifting frame assembly 3, a spindle box assembly 4, a center box assembly 5, a material box assembly 6, a material box drive assembly 7, an automatic loading and unloading assembly 8 and a material circulation assembly 9; the base and support frame assembly 1 and the lifting frame assembly 3 are connected via the lifting assembly 2, the spindle box assembly 4 and the center box assembly 5 are fixed on the lifting frame assembly 3, the material box assembly 6 is arranged inside the base and support frame assembly 1, one side of the material box assembly 6 is connected to the material box drive assembly 7, the upper end of the material box drive assembly 7 is provided with an automatic loading and unloading assembly 8, and the other side of the material box assembly 6 is connected to the material circulation assembly 9.

[0026] In this embodiment, the finishing system realizes the finishing and polishing of the surface of the super-large titanium alloy thin-walled parts of aircraft engines after chemical milling, and is used for the finishing process of large casings, disk shafts or cylindrical workpieces, removes microscopic corrosion lines, reduces the surface roughness value of the workpiece, improves the grinding lines, and removes the sharp corners, edges, burrs and sharp edges on the surface of the workpiece. The outer wall of the finishing system is provided with a system profile, which effectively protects the finishing system and has a beautiful appearance. The finishing system also includes a control system, and the lifting assembly 2, the lifting frame assembly 3, the spindle box assembly 4, the top box assembly 5, the material box assembly 6, the material box drive assembly 7, the automatic loading and unloading assembly 8 and the material circulation assembly 9 are respectively electrically connected to the control system.

[0027] See also Figure 1 , Figure 2 and Figure 3 As shown, the base and support frame assembly includes a base assembly 11 and a support frame assembly 12 , and the support frame assembly 12 is arranged at the upper end of the base assembly 11 .

[0028] In this embodiment, the base and support frame assembly 1 includes a base assembly 11 and a support frame assembly 12. The base assembly 11 is arranged on the ground of the working area and is used to support the finishing system. Figure 2 As shown, the base assembly 11 includes a bottom plate 111 and a side support 112. The bottom plate 111 is arranged at the bottom of the finishing system. A leveling device is provided on the lower end surface of the bottom plate 111 to keep the finishing system level to ensure the stable operation of the system. Side supports 112 are longitudinally provided on both sides of the bottom plate 111 to play a supporting role. The middle part of the side support 112 is composed of a number of longitudinally arranged steel plates spliced ​​by bolts to reduce the weight of the system; specifically, each side support 112 is composed of 6 steel plates placed longitudinally parallel to each other, and an arched hole is opened at the lower end of each steel plate to facilitate operation and reduce weight. Two short steel plates placed horizontally are connected to the opposite surfaces of two adjacent steel plates, and the same side of the 6 short steel plates is connected to the same whole steel plate to stabilize the side support. Support beams 113 are connected to the middle upper ends of the side supports 112 on both sides, and the support beams 113 and the side supports 112 jointly support the support frame assembly 12. A supporting roller and a limiting roller are fixedly provided on the bottom plate 111. The supporting roller and the limiting roller are in contact with the bottom of the material box assembly 6 respectively. The supporting roller is used to maintain the stability of the material box 62 in a moving state, and the limiting roller is used to limit the position of the material box 62. Figure 3As shown, the support frame assembly 12 includes a support frame 121, a support side frame 122 and a lifting frame slide rail 123; specifically, a support frame 121 is connected between two support side frames 122, the lower end of the support frame 121 is connected to the support beam 113, and the lower ends of the two support side frames 122 are respectively connected to the upper end of a side support 112, and the support frame 121 and the support side frames 122 jointly form a stable structure to ensure that the finishing system will not be greatly deflected by the impact force during processing; a lifting frame slide rail 123 is provided on the side of the support frame 121, and the lifting frame slide rail 123 is slidably connected to the lifting frame assembly 3 to provide a guide for the lifting frame assembly 3 to avoid the lifting frame assembly 3 from tilting due to the running speed deviation of the lifting assemblies 2 on both sides; specifically, there are two lifting frame slide rails 123, which are symmetrically and longitudinally fixed on the same side of the support frame 121. The discharge port 93 in the material circulation assembly 9 is provided at the top of the support frame 121.

[0029] See also Figure 2 As shown, a screw lift 114 is arranged in the side support 112 , and two ends of the screw lift 114 are respectively arranged on the bottom plate 111 and the upper end of the side support 112 , and a limit block 115 is provided at the upper end of the screw lift 114 .

[0030] In this embodiment, a screw lift 114 is provided in each side support 112, and a limit block 115 is fixed on the upper end of the two screw lifts 114. The limit block 115 contacts the upper V-shaped block 311 provided at the lower end of the lifting frame assembly 3. The screw lift 114 is driven to rise or fall by a servo motor, thereby adjusting the position of the limit block 115 at the top of the screw lift 114 to adjust the position of the lifting frame assembly 3, so as to avoid the different diameters of different workpieces being too close or too far from the bottom of the material box 62, thereby affecting the finishing effect.

[0031] See also Figure 1 and Figure 2 As shown, the lifting assembly 2 includes at least one pair of hydraulic cylinders 21 symmetrically arranged on the base and the support frame assembly 1 , and the other end of the hydraulic cylinder 21 is connected to the lifting frame assembly 3 .

[0032] In this embodiment, the lifting assembly 2 includes at least one pair of hydraulic cylinders 21, specifically two, which are symmetrically arranged in the side support 112 of the support frame assembly 12, and serve as a power source to control the lifting frame assembly 3 to move up and down, and to control the loading and unloading position of the workpiece and the feeding position. Specifically, the hydraulic cylinder 21 uses a reciprocating hydraulic cylinder, one end of the hydraulic cylinder 21 is fixed on the bottom plate 111, and the other end of the hydraulic cylinder 21 passes through the side support 112 and is fixed to the bottom end of the lifting frame assembly 3. Through the reciprocating operation of the hydraulic cylinder 21, the lifting frame assembly 3 is driven to move up and down. When the lifting frame assembly 3 falls to the limit block 115, the hydraulic cylinder 21 continues to pressurize and maintain a certain pressure to maintain the stability of the lifting frame assembly 3, the spindle box assembly 4 and the top box assembly 5 during the processing process. The hydraulic cylinder 21 is buried in the side support 112 and does not affect the normal operation of the material box assembly 6.

[0033] See also Figure 4 As shown, the lifting frame assembly 3 includes a lifting frame body 31 , a clamping synchronization system 32 and a transition plate 33 , and the transition plate 33 is arranged inside the lifting frame body 31 through the clamping synchronization system 32 .

[0034] In this embodiment, the lifting frame body 31 is the overall structural frame of the lifting frame assembly 3, which is made of tripod steel. The clamping synchronization system 32 includes a clamping cylinder 321, the number of which is two, and the two clamping cylinders 321 are arranged in opposite directions. The cylinder ends of the two clamping cylinders 321 are fixed on the lifting frame body 31, and the piston ends of the two clamping cylinders 321 are respectively connected to a transition plate 33. The two transition plates 33 are respectively arranged at both ends of the lifting frame body 31 through a slide rail 1; wherein, one transition plate 33 is connected to the spindle box assembly 4, and the other transition plate 33 is connected to the top box assembly 5, and the clamping cylinder 321 drives the transition plate 33 to slide toward or in the opposite direction to complete the clamping or loosening action. The two clamping oil cylinders 321 are equipped with synchronous motors to ensure the synchronization of the clamping synchronization system 32, and then ensure the synchronization of the two transition plates 33, that is, to ensure the synchronization of the spindle box assembly 4 and the center box assembly 5, so that the workpiece can rotate forward or reverse smoothly. A limit baffle is provided in the lifting frame 31 to prevent the spindle box assembly 4 or the center box assembly 5 from derailing and colliding when the hydraulic pressure of the clamping oil cylinder 321 is out of control, thereby damaging the machine body. An upper V-shaped block 311 is fixed at the lower end of both sides of the lifting frame body 31. The upper V-shaped block 311 is arranged corresponding to the position of the limit block 115 provided on the base and the support frame assembly 1, so that the upper V-shaped block 311 contacts the limit block 115 when descending. The upper V-shaped block 311 is made of a buffer material, including but not limited to a rubber material, to prevent the limit block 115 from directly colliding with the lifting frame body 31 and causing damage. The upper V-shaped block 311 and the limit block 115 jointly limit the movement of the lifting frame assembly 3 to ensure the stability of the movement of the lifting frame assembly 3. The lifting frame assembly 3 is driven by the lifting assembly 2 to lift and lower, driving the workpiece to enter and exit the material box assembly 6. When processing workpieces of different diameters, the workpiece is adjusted to a suitable height for finishing processing by controlling the screw lift 114 and the hydraulic cylinder 21 of the lifting assembly 2.

[0035] See also Figure 5 As shown, the spindle box assembly 4 includes a spindle box body 41 and a spindle motor 42 arranged on the spindle box body 41 , and the spindle box body 41 is connected to a transition plate 33 .

[0036] In this embodiment, the spindle housing 41 is connected to a transition plate 33 in the lifting frame assembly 3, and the spindle housing 41 is driven by the clamping oil cylinder 321 in the clamping synchronization system 32. The spindle motor 42 is fixed to one side of the spindle housing 41. The spindle motor 42 transmits torque to the output spindle 43 through a gear set. The output spindle 43 is arranged at the lower end of the spindle housing 41. The output spindle 43 is connected to the workpiece, so that the output spindle 43 transmits torque to the workpiece, so that the workpiece rotates during the processing. The output spindle 43 has forward and reverse functions, and the speed of the output spindle 43 can be adjusted in the control panel.

[0037] The top box assembly 5 includes a top box body, which is symmetrically arranged on another transition plate 33.

[0038] In this embodiment, the structure of the center center box is the same as that of the spindle box 41, and the center center box assembly 5 and the spindle box assembly 4 operate simultaneously to clamp the workpiece; a driven rotating shaft is provided at the lower end of the center center box, and the workpiece is connected between the output spindle 43 of the spindle box assembly 4 and the driven rotating shaft of the center center box assembly 5, the output spindle 43 on the spindle box assembly 4 is the driving shaft, and the driven rotating shaft on the center center box assembly 5 is the driven shaft, and the driving shaft and the driven shaft jointly drive the workpiece to rotate.

[0039] See also Figure 1 and Figure 6 As shown, the material box assembly 6 includes a mounting bracket 61, a material box 62, a drain port and a discharge port. The mounting bracket 61 is connected to the material box drive assembly 7. The material box 62 is arranged at the upper end of the mounting bracket 61, and the material box 62 has a drain port and a discharge port at the bottom end.

[0040] In this embodiment, the material box assembly 6 is arranged inside the base and support frame assembly 1, and is used to perform finishing and polishing on the surface of the workpiece, and the workpiece includes but is not limited to titanium alloy thin-walled parts. One side of the material box assembly 6 is connected to the material box drive assembly 7. Driven by the material box drive assembly 7, the material box assembly 6 performs linear reciprocating motion, thereby ensuring the process accuracy of the finishing system. Specifically, the mounting bracket 61 is a rectangular frame, and one side of the mounting bracket 61 is connected to the material box drive assembly 7. The material box 62 is fixed to the upper end of the mounting bracket 61. A certain amount of grinding blocks and grinding fluid are stored in the material box 62. The grinding blocks are used to provide grinding power for the processing of the workpiece. The mounting bracket 61 drives the material box 62 and the grinding blocks in the material box 62 to perform linear reciprocating motion together, and cooperates with the rotation of the workpiece to uniformly process the processing part, and perform a finishing and polishing process. The material box 62 adopts an irregular octagonal, square or circular bucket-shaped structure, see Fig.15 As shown, the bottom of the material box 62 has an inclination, which avoids the accumulation of grinding blocks to the greatest extent, reduces the formation of "dead materials", reduces the self-grinding of grinding blocks, and makes full use of grinding blocks; the material box 62 is made of but not limited to stainless steel. Four drain ports and four discharge ports are opened at the bottom of the material box 62. The drain ports and the discharge ports are each equipped with an automatic door. The automatic door is electrically connected to a control switch. The material box 62 is controlled by a program to discharge, stop discharging, drain or stop draining, and is optimized according to specific usage conditions. The drain port and the discharge port are both connected to a collecting funnel. The two drain ports and the two discharge ports on the same side jointly discharge the grinding blocks and grinding liquid in the material box 62 into the same collecting funnel, and then into the material circulation assembly 9. A water receiving tray is provided below the material box 62 to prevent damage caused by splashing. A protective cover is provided around the material box 62 to prevent injuries to the hands due to edges.

[0041] The material box assembly 6 is suspended on the support frame assembly 12 through the suspension assembly, and the lower end of the material box assembly 6 is rollingly connected to the support roller and the limit roller.

[0042] In this embodiment, the suspension assembly includes four chains, two of which form a group, and the two groups of chains are respectively arranged on the symmetrical sides of the material box 62. One end of the chain is fixed to the side of the material box 62, and the other end is fixed to the inner wall of the side support 112 of the support frame assembly 12, which is used to assist in pulling the material box 62, assist the material box 62 to reciprocate, and alleviate the impact of the material box 62 on the material box drive assembly 7 due to inertia. The suspension assembly also includes a spring, which is arranged between the material box 62 and the material box drive assembly 7, assisting the material box 62 to reciprocate, and relieving the impact of the material box 62 on the material box drive assembly 7 due to inertia.

[0043] See also Figure 1 and Figure 7 As shown, the material box driving assembly 7 includes a casting stand 71, a driving motor 72, a slewing support 73 and a transition connecting rod 74. The slewing support 73 is rotatably connected to the casting stand 71, and the driving motor 72 is connected to the transition connecting rod 74 through the slewing support 73.

[0044] In this embodiment, the casting stand 71 is a structure with a space in the middle and side walls on both sides, and is located on the ground of the working area. The slewing support 73 is arranged in the middle space of the casting stand 71 and is a square structure; the driving motor 72 is fixed to the upper end of the slewing support 73, and the two side ends of the slewing support 73 are respectively connected to the transition connecting rod 74 through the cam plate. The slewing support 73, the cam plate and the transition connecting rod 74 together constitute a cam connecting rod mechanism, which converts the rotation of the driving motor 72 into the linear reciprocating motion of the other end of the transition connecting rod 74. The other end of the transition connecting rod 74 is connected to the mounting bracket 61 of the material box assembly 6 to drive the linear reciprocating motion of the material box assembly 6. The driving motor 72 uses a reducer with a power of 15kW and adopts a suspension + torque arm installation form. There are center holes on both sides of the casting stand 71, and the two center holes are processed at one time to ensure that the slewing support 73 is concentric. The two side ends of the slewing support 73 pass through the center hole and are connected to the transition connecting rod 74.

[0045] See also Figure 1 and Figure 8 As shown, the automatic loading and unloading assembly 8 includes a second slide rail 81, a fork bracket 82 and a servo drive system 83. The second slide rail 81 is arranged at the upper end of the material box drive assembly 7, the fork bracket 82 is slidably connected to the second slide rail 81, and the second slide rail 81 is connected to the servo drive system 83.

[0046] In this embodiment, the automatic loading and unloading assembly 8 is equipped with a workpiece, which is used to automatically and accurately deliver the workpiece to the space between the spindle box assembly 4 and the top box assembly 5 above the material box assembly 6, so as to load and unload the workpiece, realize the automatic loading and unloading function, and complete a processing flow. The second slide rail 81 is arranged at the upper end of the outer shell of the material box drive assembly 7, and the fork bracket 82 is arranged above the second slide rail 81 and is slidably connected to the second slide rail 81. The fork bracket 82 is accurately positioned by the proximity switch to transport the workpiece to the clamping position; the fork bracket 82 is also fixed with a receiving tray 84, which is used to collect the grinding blocks and grinding fluid carried by the workpiece during the loading and unloading process to prevent the grinding blocks and grinding fluid from splashing everywhere. The second slide rail 81 is connected to the servo drive system 83, which is fixed below the second slide rail 81. The maximum telescopic amount of the servo drive system 83 reaches 2900mm, and the maximum load is 300kg.

[0047] See also Figure 1 and Fig. 9 As shown, the material circulation assembly 9 includes a linear vibrating screen 91 and an abrasive elevator 92. One end of the linear vibrating screen 91 is connected to the bottom of the material box assembly 6, and the other end is connected to the bottom end of the abrasive elevator 92. A discharge port 93 is provided at the top of the abrasive elevator 92, and the discharge port 93 faces the inside of the material box assembly.

[0048] In this embodiment, the material circulation assembly 9 is used for online screening and circulation of abrasives, and the cleaning interval of abrasives is extended. There are several groups of linear vibrating screens 91, one end of each group of linear vibrating screens 91 is connected to the discharge port at the bottom of the material box 62, and the other end is connected to the bottom of the abrasive elevator 92. The top of the abrasive elevator 92 is provided with a discharge port 93, which is aimed at the lower part of the workpiece to be processed, specifically, the height of the workpiece from the bottom to the top. to The remaining abrasive is sprayed onto the workpiece through the abrasive hoist 92 to complete the abrasive backfilling. This abrasive backfilling method adopts a short-distance throwing form to generate compressive stress on the workpiece surface, further improve the corrosion resistance of the workpiece surface, and achieve the effect of strengthening the workpiece surface.

[0049] The linear vibrating screen 91 is divided into two groups, which are respectively connected to the abrasive elevator 92 .

[0050] A screen is provided inside the linear vibration screen 91 , and a waste discharge port 94 is provided at the bottom end of the linear vibration screen 91 . The waste discharge port 94 is connected to a waste recovery box 95 .

[0051] In this embodiment, the abrasive blocks and grinding liquid in the material box are discharged into the linear vibrating screen 91 through the discharge port, and vibrated and screened by the linear vibrating screen 91. The intact abrasive is transported to the abrasive elevator 92 at the uppermost side, and is lifted by the abrasive elevator 92 and discharged from the discharge port 93 into the material box 62 to the workpiece. The damaged abrasive passes through the screen and goes down to the discharge layer. With the vibration, it is discharged from the waste discharge port 94 into the waste recovery box 95. The waste in the waste recovery box 95 is cleaned regularly by hand. The linear vibrating screen 91 is also provided with a liquid discharge port, which is connected to the water circulation system. The grinding liquid flows from the bottom layer into the water circulation system through the liquid discharge port. The waste discharge port 94 and the liquid discharge port can be manually adjusted to achieve controllable flow.

[0052] The finishing system also includes a hydraulic control assembly, which is connected to the lifting assembly 2 and the clamping synchronization system 32 respectively.

[0053] In this embodiment, the hydraulic control assembly includes a hydraulic pump, a hydraulic valve group and a hydraulic sensor. The hydraulic control assembly pumps hydraulic oil into the hydraulic cylinder 21 of the lifting assembly 2 and the clamping cylinder 321 of the clamping synchronization system 32 through the hydraulic pump, and a hydraulic sensor is set on the corresponding pipeline. The pressure value is monitored in real time to maintain the stability of the cylinder pressure and ensure the processing effect of the workpiece. The hydraulic sensor is connected to a hydraulic valve, which is set on the corresponding pipeline to control the pumping and stopping of the hydraulic oil.

[0054] According to actual needs, the finishing system also includes auxiliary systems, including a lifting crane 85, a water circulation system, a sewage treatment system, a gas control assembly, a lubrication system, a suspension system and safety protection. Among them, the gas control assembly, the lubrication system, the suspension system and the safety protection are all existing technologies and will not be described in detail; the lifting crane 85, the water circulation system and the sewage treatment system are briefly introduced below: See also Fig.10 As shown, the lifting crane 85 is mainly used to assist in loading and unloading of parts. The lifting crane 85 includes a hydraulic mechanism 851, a hook 852 and a suspension rod 853. One end of the hydraulic mechanism 851 is connected to the base of the lifting crane 85, and the other end is connected to the suspension rod 853. The hydraulic mechanism 851 is used as a lifting power to control the rise and fall of the suspension rod 853. Guide wheels are provided on both sides of the lifting crane 85, and the guide wheels are used to accurately control the lifting position. A hook 852 is provided on the suspension rod 853 of the lifting crane 85, and the hook 852 is used to connect the workpiece.

[0055] See also Fig.11As shown, the water circulation system is used for the recycling of grinding fluid during the finishing process. The water circulation system includes a water tank 1011, a filter device 1012 and a pneumatic diaphragm pump 1013; the water tank 1011 includes a clean water tank and a sewage tank, and the inside of the clean water tank and the inside of the sewage tank are connected through an overflow tank 1014; the outside of the clean water tank is connected to the outside of the sewage tank through a filter device 1012 and a pneumatic diaphragm pump 1013; the clean water tank is connected to a circulating water supply 1015 and a clean water tank drainage 1016, and the sewage tank is connected to a circulating return water 1017 and a sewage tank drainage 1018; the circulating water supply 1015 and the circulating return water 1017 are respectively connected to the material tank assembly 6. A high and low liquid level marking device is configured in the water tank, and the high and low liquid level marking device is electrically connected to the control system. The control system controls the water flow by monitoring the high and low liquid level marking device. The pneumatic diaphragm pump 1013 adopts a metal diaphragm pump; the filtering device 1012 adopts a centrifugal filtering system, which is mainly composed of a filter, an auxiliary pump valve group, a high-speed centrifugal filter, an automatic sludge scraping system and a control part. The grinding liquid is filtered twice to improve the cleaning effect of the grinding liquid and extend the service life. The water circulation system pumps the grinding liquid flowing into the sewage tank into a single bag filter, separates the solid and liquid of the grinding liquid for finishing, and then pumps the clean water into the finishing system by the main water pump for recycling, so as to effectively remove various impurities, extend the service life of the grinding liquid, and improve the finishing effect. The circulating water needs to be uniformly collected and processed when it is replaced; the sludge generated during the filtration process is automatically scraped off and discharged to the collection tank. The filtration accuracy meets the particle size ≤20μm. After finishing for a period of time, the grinding liquid in the water tank becomes dirty, and the centrifugal filtering system is started to filter the mud powder in the grinding liquid. The filtered grinding liquid flows back to the water tank to continue to participate in finishing. Preferably, deionized water (Class A water) in the abrasive is used to dilute the grinding liquid and lubricate; 3000L of water is added to the water circulation system, and a water level mark is made in the water circulation system; the water temperature is adjusted to about 5℃~40℃. After 8 hours of vibration finishing, the sludge impurities in the sewage tank of the water circulation system need to be removed and water needs to be added; after 120 hours of finishing work, the water circulation system needs to be emptied and cleaned, and water and grinding liquid are added to the marked water level; the time for abrasive cleaning and replacement of grinding liquid and circulating water is based on the cleanliness of the workpiece and can be changed according to actual conditions.

[0056] The sewage treatment system includes a filter device 2 and a high-speed centrifugal solid-liquid separation device, and the filtration accuracy meets the particle size of ≤120μm. The high-speed centrifugal solid-liquid separation device sucks the oil or liquid to be separated into the high-speed centrifugal rotor through the feed pump for high-speed rotation and separation. The heavy phase material is separated on the outer wall of the rotor due to its specific gravity, and the light phase liquid flows out naturally from the bottom of the middle of the rotor. Under a certain gravity field and centrifugal radius, this equipment can separate impurities as small as 1um. When the impurities in the rotor reach a certain thickness, the sewage treatment system automatically discharges slag.

[0057] The operation steps of the finishing system after chemical milling of a large thin-walled titanium alloy part of the present invention are as follows: Step 1: See Fig.12 As shown, the workpiece is manually pushed to the designated location via a trolley.

[0058] Step 2: See Fig.13 As shown, the lifting crane 85 is started, the suspension rod 853 of the lifting crane 85 is automatically lowered to the specified position, and the two ends of the workpiece are manually hung on the hook 852.

[0059] Step 3: Control the lifting crane 85 to drive the workpiece to the highest point, and the fork bracket 82 in the automatic loading and unloading assembly 8 slides along the slide rail 2 81 to the loading and unloading position at the lower end of the lifting crane 85 boom 853.

[0060] Step 4: The lifting crane 85 drops the workpiece onto the fork bracket 82 in the automatic loading and unloading assembly 8, and the hook 852 of the lifting crane 85 is manually removed.

[0061] Step 5: See Fig.14 As shown, the finishing system is started with one button, and the automatic loading and unloading assembly 8 sends the workpiece to the middle of the spindle box assembly 4 and the center box assembly 5, and the workpiece is clamped by the spindle box assembly 4 and the center box assembly 5, and the automatic loading and unloading assembly 8 is withdrawn.

[0062] Step 6: According to the parameters set by the control system, the screw lift 114 drives the limit block 115 to rise to the corresponding position, and the lifting frame assembly 3 drives the spindle box assembly 4, the center box assembly 5 and the workpiece to descend into the material box 62 until the limit block 115 contacts the upper V-shaped block 311, the lifting frame assembly 3 stops descending, and the workpiece reaches the specified position in the material box 62. Fig.15 As shown, the abrasive in the material box 62 moves below the workpiece. The workpiece is partially buried and polished; the spindle box assembly 4 drives the workpiece to rotate in both the forward and reverse directions, while the material box assembly 6 performs linear reciprocating motion to complete the polishing and finishing process of the workpiece according to the set program.

[0063] Step 7: During the processing, the material circulation assembly 9 screens out the damaged abrasives in the material box 62, and then sprays the remaining abrasives back onto the workpiece through the abrasive elevator 92 to complete the abrasive backfilling. This abrasive backfilling method uses a short-distance throwing form to generate compressive stress on the workpiece surface, further improving the corrosion resistance of the workpiece surface and achieving the effect of strengthening the workpiece surface.

[0064] Step eight: After the processing is completed, the lifting frame assembly 3 drives the workpiece to rise, and the workpiece is automatically placed on the fork bracket 82 of the automatic loading and unloading assembly 8. The automatic loading and unloading assembly 8 transports the workpiece to the loading and unloading position of step four, and the workpiece is manually hung on the hook 852, and the boom 853 on the lifting crane 85 is raised, the automatic loading and unloading car is retracted, and finally the lifting crane 85 places the workpiece on the trolley. At this point, a complete finishing process of the workpiece is completed.

[0065] Step 9: Use ultrasonic wave to measure the wall thickness of the workpiece after finishing.

[0066] See also Figure 16-Figure 19 As shown, the technical indicators of the finishing system before and after chemical milling of the titanium alloy large thin-walled parts of the present invention are as follows: (1) See Fig.16 (a) Fig.16 (b) with Fig.16 (c) By comparison, it can be seen that there are obvious sharp edges at the intersection of the edges of the workpiece before finishing; after the workpiece is finished for 2 hours, there is an obvious chamfer transition at the intersection of the edges of the workpiece, and the specific chamfer size is 0.1mm-0.2mm; after the workpiece is finished for 4 hours, there is a very obvious chamfer transition at the intersection of the edges of the workpiece, and the specific chamfer size is 0.2mm-0.3mm; therefore, after the workpiece is finished and polished by this finishing system, a chamfer that meets the standard requirement that the chamfer size of the workpiece is in the range of 0.1mm-0.4mm is formed.

[0067] (2) Fig.17 (a) is the concave texture state 1 of the workpiece before finishing. Fig.17 (b) is the concave texture state 1 of the workpiece after finishing for 4 hours; Fig.18 (a) is the second texture state of the edge surface before finishing of the workpiece. Fig.18 (b) is the second texture state of the edge surface of the workpiece after finishing for 4 hours; Fig.19 (a) is the texture state 3 of the upper surface of the workpiece before finishing. Fig.19 (b) is the third state of the upper surface texture of the workpiece after finishing for 4 hours. By comparison, it can be seen that after the workpiece is finished and polished by this finishing system, no defects are caused to the substrate after vibration finishing, the scratches on the workpiece surface are removed, the knife marks become lighter, and no bumps or corrosion are caused to the surface texture of the workpiece.

[0068] (3) When the workpiece is being polished by this polishing system, the surrounding noise level is less than 70db when measured at a distance of 3 meters from the polishing system by a noise meter.

[0069] In summary, the verification results show that the workpiece meets the standards after finishing by this finishing system.

Claims

1. A finishing system for large thin-walled titanium alloy parts after chemical milling, characterized in that: It includes a base and support frame assembly, a lifting assembly, a lifting frame assembly, a spindle box assembly, a center box assembly, a material box assembly, a material box drive assembly, an automatic loading and unloading assembly and a material circulation assembly; the base and support frame assembly and the lifting frame assembly are connected through the lifting assembly, the spindle box assembly and the center box assembly are fixed on the lifting frame assembly, the material box assembly is arranged inside the base and support frame assembly, one side of the material box assembly is connected to the material box drive assembly, the upper end of the material box drive assembly is provided with an automatic loading and unloading assembly, and the other side of the material box assembly is connected to the material circulation assembly.

2. The finishing system for large titanium alloy thin-walled parts after chemical milling according to claim 1 is characterized in that: The base and support frame assembly include a base assembly and a support frame assembly, the support frame assembly is arranged at the upper end of the base assembly; the base assembly includes a bottom plate and side supports, side supports are longitudinally arranged on both side edges of the bottom plate, and a support beam is connected in the middle of the side supports on both sides; the support frame assembly includes a support frame, a support side frame and a lifting frame slide rail, a support frame is connected in the middle of two of the support side frames, the lower end of the support frame is connected to the support beam, the lower ends of the two support side frames are respectively connected to the upper ends of the side supports, and the lifting frame slide rail is arranged on the side of the lifting frame.

3. The finishing system for large titanium alloy thin-walled parts after chemical milling according to claim 2 is characterized in that: A screw lift is arranged in the side support, and two ends of the screw lift are respectively arranged on the bottom plate and the upper end of the side support, and a limit block is arranged on the upper end of the screw lift.

4. The finishing system for large titanium alloy thin-walled parts after chemical milling according to claim 1 is characterized in that: The lifting frame assembly includes a lifting frame body, a clamping synchronization system and a transition plate, and the transition plate is arranged inside the lifting frame body through the clamping synchronization system; the spindle box assembly includes a spindle box body and a spindle motor arranged on the spindle box body, and the spindle box body is connected to a transition plate; the center box assembly includes a center box body, which is symmetrically arranged on the other transition plate.

5. The finishing system for large titanium alloy thin-walled parts after chemical milling according to claim 1 is characterized in that: The material box assembly includes a mounting bracket, a material box, a water outlet and a material discharge port. The mounting bracket is connected to the material box drive assembly. The material box is arranged at the upper end of the mounting bracket, and the water outlet and the material discharge port are opened at the bottom end of the material box.

6. The finishing system for large titanium alloy thin-walled parts after chemical milling according to claim 1 is characterized in that: The material box driving assembly includes a casting stand, a driving motor, a slewing support and a transition connecting rod. The slewing support is rotatably connected to the casting stand, and the driving motor is connected to the transition connecting rod through the slewing support.

7. The finishing system for large titanium alloy thin-walled parts after chemical milling according to claim 1 is characterized in that: The automatic loading and unloading assembly includes a second slide rail, a fork bracket and a servo drive system. The second slide rail is arranged at the upper end of the material box drive assembly, the fork bracket is slidably connected to the second slide rail, and the second slide rail is connected to the servo drive system.

8. The finishing system for large titanium alloy thin-walled parts after chemical milling according to claim 1 is characterized in that: The material circulation assembly includes a linear vibrating screen and an abrasive elevator. One end of the linear vibrating screen is connected to the bottom of the material box assembly, and the other end is connected to the bottom end of the abrasive elevator. The top of the abrasive elevator is provided with a discharge port, and the discharge port faces the inside of the material box assembly.

9. The finishing system for large titanium alloy thin-walled parts after chemical milling according to claim 1, characterized in that: It also includes a lifting crane, which includes a hydraulic mechanism, a hook and a suspension rod. One end of the hydraulic mechanism is connected to the base of the lifting crane, and the other end is connected to the suspension rod. A hook is provided at the lower end of the suspension rod.

10. The finishing system for large titanium alloy thin-walled parts after chemical milling according to claim 1, characterized in that: It also includes a water circulation system, which includes a water tank, a filter device and a pneumatic diaphragm pump; the water tank includes a clean water tank and a sewage tank, the interior of the clean water tank and the interior of the sewage tank are connected through an overflow tank; the outside of the clean water tank is connected to the outside of the sewage tank through a filter device and a pneumatic diaphragm pump; the clean water tank is connected to a circulating water supply and a clean water tank drainage, and the sewage tank is connected to a circulating return water and a sewage tank drainage; the circulating water supply and the circulating return water are respectively connected to the material box assembly.

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