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CN-121972989-A - Method for machining integral closed impeller by combining planing table type boring machine and vertical rotary worktable

CN121972989ACN 121972989 ACN121972989 ACN 121972989ACN-121972989-A

Abstract

The invention relates to the field of machining, in particular to a method for machining an integral closed impeller by combining a planer type boring machine and a vertical rotary workbench. The method is characterized in that machining is achieved through cooperation of a planer type boring machine and a vertical rotary table, the vertical rotary table (2) is added to a rotary table (5) of the planer type boring machine, the bottom of a workpiece (4) to be machined is relatively fixed through a connecting structure (3), the workpiece to be machined is a blank of an integral closed impeller, the rotary table (2) is a vertical table, a rotating motor of the rotary table (2) drives the workpiece (4) to be machined to rotate for machining, the planer type boring machine is matched with the integrated high-precision vertical rotary table to form a new linkage machining system, machining states inside a runner are clearly visible under a horizontal machining visual angle, real-time monitoring is facilitated, and chips are convenient to discharge. The boring bar of the spindle power system (1) is slender and telescopic, and the interference of the machining process is small.

Inventors

  • SHEN XUEGANG
  • HUANG LIBEN
  • RUAN WEIWEI

Assignees

  • 西安中博机械制造有限公司

Dates

Publication Date
20260505
Application Date
20260324

Claims (8)

  1. 1.A method for processing an integral closed impeller by combining a planer boring machine and a vertical rotary worktable is characterized in that, The method realizes processing by matching a planing table type boring machine with a vertical rotary worktable; a vertical rotary worktable (2) is added on a rotary worktable (5) of the planing machine type boring machine; The rotary workbench (2) is vertically arranged, the rotary workbench (2) comprises a shell, a rotary motor is arranged in the shell, the rotary motor is a forward and reverse rotary motor, a fixed disc is arranged on a power shaft of the rotary motor, and the bottom of a workpiece (4) to be processed is relatively fixed on the fixed disc through a connecting structure (3); the workpiece to be processed is a blank of an integral closed impeller; the rotary workbench (2) is a vertical workbench; The rotary motor of the rotary workbench (2) rotates to drive the workpiece (4) to be processed to realize multi-angle processing; the planing table type boring machine is matched with the integrated high-precision vertical rotary table to form a novel linkage processing system, the processing state in the runner is clearly visible under the horizontal processing view angle, the real-time monitoring is convenient, and the chips are naturally discharged under the auxiliary action of gravity to facilitate the scrap iron discharge.
  2. 2. The method for cooperatively processing the integral closed impeller by the planing table type boring machine and the vertical rotary worktable according to claim 1, wherein the processing indexing accuracy of the rotary worktable (2) is less than or equal to 5'', the spindle torque of the planing table type boring machine is more than or equal to 2000N seed m, and the long-stroke boring bar can be extended to 800mm.
  3. 3. The method for cooperatively processing an integral closed impeller with a planer-type boring machine and a vertical rotary table according to claim 1, wherein the planer-type boring machine comprises a retractable boring bar design, the distance between a spindle head and a workpiece is adjustable, and the flow passage processing interference is small.
  4. 4. A method for co-operating a planer boring machine and a vertical rotary table to machine an integrally closed impeller according to claim 1, characterised in that the rotation angle of the rotary motor of the rotary table (2) is adjustable in conjunction with the planer boring machine rotary table, i.e. the position of the workpiece (4) to be machined is adjusted by the rotation angle, and the position of the machining spindle head is adjusted by the planer boring machine.
  5. 5. The method of claim 1, further comprising a high pressure cooling system, wherein the high pressure cooling system is a device for delivering cutting fluid at high pressure, and the cutting fluid is sprayed to the cutting area of the tool and the workpiece, thereby cooling and removing chips.
  6. 6. A method for co-operating a planer boring machine and a vertical rotary table to machine an integrally closed impeller as claimed in claim 1 characterised in that a guard is arranged below the planer boring machine rotary table (5).
  7. 7. A method of co-operating a planer boring machine and a vertical rotary table to machine an integrally closed impeller as claimed in claim 1, characterised in that the workpiece (4) to be machined can be machined into a closed impeller flow path.
  8. 8. A method for co-operating a planer boring machine and a vertical rotary table to machine an integrally closed impeller according to claim 1, characterised in that the connecting structure (3) is a threaded hole arranged on the fixed disc, and the workpiece (4) to be machined is also provided with a threaded hole, the two threaded holes being connected by a bolt.

Description

Method for machining integral closed impeller by combining planing table type boring machine and vertical rotary worktable Technical Field The invention relates to the field of machining, in particular to a method for machining an integral closed impeller by combining a planer type boring machine and a vertical rotary workbench. Background The large-sized closed impeller is used as a high-performance core component, is widely applied to key equipment bearing extreme working conditions such as high pressure, high speed, strong corrosion and the like, and covers a plurality of core industrial fields. In the petrochemical industry, the device is mainly used for compressor impellers of catalytic cracking units and circulating compressor rotor impellers matched with hydrogenation reactors, the devices need to run in high-temperature high-pressure and corrosive media for a long time, the requirements on fatigue resistance and material stability of the impellers are extremely high, in the air energy storage industry, the device is typically used for core rotor impellers of large-scale air expanders and compressors, the device needs to have excellent aerodynamic performance and structural strength, and is adapted to frequent start-stop and high-load operation, in addition, in other high-end industrial scenes such as heavy-duty gas turbine compressors, deep-sea oil-gas exploitation platform compressors and the like, the impellers also need to meet stricter standards for corrosion resistance, fatigue resistance and overall reliability. The large integral closed impeller has various remarkable advantages, and is particularly outstanding in performance and structure. The whole high-strength alloy such as high-temperature alloy, titanium alloy and the like is generally used as a raw material, and is integrally processed and formed by a five-axis numerical control machine tool, and the whole high-strength alloy impeller is free of a connecting interface, so that the fatigue strength is far higher than that of a traditional welded impeller, the raw material utilization rate is improved by about 30%, and the stress concentration and potential crack risks brought by a welded joint are fundamentally avoided. The method has the advantages of simplifying the process, omitting complex procedures such as centering, assembly welding, post-welding treatment and the like in multi-body welding, solving the problems of poor welding accessibility, difficult control of weld quality and the like caused by narrow flow channels, reducing the dependence on high-skill welders and special welding qualification, greatly improving the production consistency and efficiency, having the advantages of environmental protection and quality, avoiding welding smoke and harmful gas emission in the whole manufacturing process, improving the working environment, reducing the harm to the health of operators, omitting nondestructive testing links such as post-welding heat treatment, X-ray flaw detection and the like, reducing the repair rate and quality risk caused by welding defects, and improving the overall reliability of products. The large integral closed impeller is not faced with a plurality of technical difficulties in the processing process, and is mainly difficult in space and cutter rigidity, the width-depth ratio of the runner structure is more than 1:5, the space is extremely limited, an elongated cutter with large length-diameter ratio is required to be adopted for processing, the conditions of insufficient cutter rigidity, cutter yielding, cutter vibration and the like are easy to occur, and the blade profile precision and the surface quality are seriously influenced. The method is characterized in that the method comprises the steps of carrying out three-dimensional numerical control programming on the impeller blades, wherein the three-dimensional free curved surfaces are adopted, the impeller blades are mainly complex three-dimensional free curved surfaces, the vane type torsion degree is large, the vane spacing is small, the interference risk between adjacent vanes is high, the reasonable and safe cutter paths can be ensured by adopting UG, hyperMILL and other professional CAM systems to carry out high-precision five-axis linkage numerical control programming, chip removal and heat dissipation control are difficult, chips are difficult to smoothly discharge due to narrow flow channels, accumulation and secondary cutting are easy to cause, the heat dissipation condition of a processing area is poor, the local temperature is 300-500 ℃, the excessive rapid abrasion, burning loss and workpiece thermal deformation of the cutters are extremely easy to be caused, and extremely high requirements are put forward for cooling medium selection and cutting parameter optimization. The equipment for machining the closed impeller in the current society mainly comprises three types, namely five-axis electric sparks, a cradle type five-axis machining cent