Low-cost and high-quality machining method for powder alloy turbine disc mortise

Abstract

The invention provides a low-cost and high-quality processing method for a powder alloy turbine disc mortise, which comprises the following steps of: 1, establishing a mortise shape according to a median difference, and establishing a mortise median difference model according to a design requirement; step 2, designing a mortise linear cutting preliminary shape, and performing uniform allowance offset and trimming according to the final contour of the mortise to complete the establishment of the preliminary shape; step 3, designing the final shape of tongue-and-groove linear cutting; 4, finish machining of the broaching shape of the mortise is completed, and the broaching shape is determined according to the final shape of the design drawing and the step 3; fifthly, mortise linear cutting machining is conducted on the turbine disc; and 6, mortise broaching machining is conducted on the turbine disc subjected to linear cutting. The method has the advantages that the scheme of achieving linear cutting and finish broaching of the turbine disc mortise is verified, the development period is rapidly shortened, the machining cost is reduced, part deformation is controlled, it is guaranteed that the mortise is 100% qualified, all the problems of the quality, cost and period of the turbine disc mortise are solved from the manufacturing method, and higher value is created.

Description

Technical Field

[0001] The invention relates to the technical field of aviation engine manufacturing, and in particular to a method for processing a powder alloy turbine disc tenon and groove at low cost and high quality. Background Art

[0002] As a key component of the rotor, the turbine disk works in harsh environments and is the component with the largest thermal and mechanical loads in the engine. Therefore, the materials used for the turbine disk are all high-hardness, difficult-to-cut high-temperature alloys and powder alloys. Especially for the processing of the mortise and tenon parts, there are problems such as broaching deformation, low broaching efficiency, high broaching cost, and insufficient broaching machine capacity. How to complete the mortise and tenon processing at low cost and high quality has become a technical bottleneck and difficulty that needs to be solved urgently. Summary of the invention

[0003] The purpose of the present invention is to solve the problems of deformation, high cost and long cycle in tenon and groove processing, to improve the quality of tenon and groove broaching and to have the production capacity of rapid development and delivery, and to provide a low-cost and high-quality processing method for the tenon and groove of a powder alloy turbine disc.

[0004] The present invention provides a method for processing a powder alloy turbine disc tenon groove at low cost and high quality, comprising the following steps: Step 1: Establish the shape of the mortise and tenon according to the mean difference. Complete the establishment of the mortise and tenon mean difference model according to the design requirements;

[0005] Step 2: Design the preliminary shape of the mortise and tenon wire cutting. Perform uniform allowance offset and trimming according to the final contour of the mortise and tenon to complete the preliminary shape establishment;

[0006] Step 3, design the final shape of the mortise and tenon wire cutting, and fine-tune the local concave fillet according to the preliminary shape of the mortise and tenon wire cutting completed in step 2; Step 4, complete the finishing and broaching shape of the mortise and tenon, and determine the broaching shape according to the final shape of the design drawing and step 3; Step 5, performing mortise and tenon wire cutting processing on the turbine disc, and performing mortise and tenon wire cutting processing according to the final shape of the wire cutting; Step 6: perform mortise and tenon broaching on the turbine disc after wire cutting. Perform broaching on the remaining shape based on the mortise and tenon shape completed in step 5 to complete all processing of the parts.

[0007] This solution focuses on the difficulties in the mortise and tenon processing process and develops a new turbine disc mortise wire cutting and precision drawing processing method, which solves the problems of mortise and tenon processing deformation, high cost and long cycle from the source, improves the mortise and tenon drawing quality and has the production capacity for rapid development and delivery.

[0008] Compared with the prior art, the present invention has the following advantages: The low-cost and high-quality processing method for the powder alloy turbine disk tenon groove of the present invention verifies the solution of wire cutting and precision drawing for the turbine disk tenon groove, and achieves rapid shortening of the development cycle, reduction of processing costs, control of part deformation and guarantee of 100% qualified tenon grooves. It solves all problems of turbine disk tenon groove quality, cost and cycle from the perspective of manufacturing method, and creates higher value. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments: Figure 1 A flow chart of the low-cost and high-quality processing method for the tenon and groove of a powder alloy turbine disk; Figure 2 This is a schematic diagram of the turbine disc tongue and groove center difference model; Figure 3 This is a schematic diagram of the preliminary model of the turbine disc tongue and groove wire cutting; Figure 4 This is a schematic diagram of the final model of the turbine disc tongue and groove wire cutting; Figure 5 Schematic diagram of the turbine disc tenon and groove finishing broaching model. DETAILED DESCRIPTION

[0010] Aiming at the problems of broaching deformation, low broaching efficiency, high broaching cost and insufficient broaching machine capacity in the processing of the mortise and tenon parts, the present invention has developed a new turbine disc mortise wire cutting and fine drawing processing method, which solves the problems of mortise and tenon processing deformation, high cost and long cycle from the source, improves the mortise and tenon broaching quality and has the production capacity of rapid development and delivery. Taking a certain type of turbine disc parts of an aircraft engine as an example, the present invention introduces the implementation scheme of the low-cost and high-quality processing and manufacturing process of mortise and tenon wire cutting and fine drawing, and the present invention is further explained below in conjunction with the drawings and examples.

[0011] The overall process, such as Figure 1 shown.

[0012] 1) Establish the shape of the mortise and tenon according to the mean difference. Complete the establishment of the mortise and tenon mean difference model on the computer according to the design requirements, such as Figure 2 ;

[0013] 2) Design the initial shape of the mortise and tenon wire cutting. Perform a uniform offset according to the final contour of the mortise and tenon on the computer. The offset value is 0.6mm. After trimming, the initial shape is established. Figure 3 ;

[0014] 3) Design the final shape of the mortise and tenon wire cutting. According to the preliminary shape of the mortise and tenon wire cutting completed in step 2, fine-tune the local concave fillet. Since the diameter of the wire cutting wire used is Φ0.25mm, all the fillet diameters are modified to ≥Φ0.25mm. If efficiency is considered, the diameter can be modified to equal to Φ0.3mm to ensure that there are no concave points when the wire cutting wire moves, the wire will not break during processing, and the principle of minimizing the fillet size is met. The final shape of the mortise and tenon wire cutting is established, such as Figure 4 ;

[0015] 4) Complete the finishing and broaching shape of the mortise and tenon. According to the final shape of the design drawing and step 3, complete the Boolean operation to obtain the difference and form the broaching shape, such as Figure 5 ;

[0016] 5) Perform mortise and tenon wire cutting on the turbine disc. Prepare the wire cutting program according to the mortise and tenon wire cutting groove shape formed in step 3, and complete the mortise and tenon cutting of one circle of the wheel disc in sequence, which is completed in three steps: the first cutting is offset with a 2mm margin in the mortise and tenon tool compensation, and a rough drawing is performed to release the deformation and stress of the parts, and then the mortise and tenon wire cutting is performed to the final shape of the wire cutting, and a fine drawing is performed, and then the mortise and tenon wire cutting is performed to the final shape of the wire cutting, and 1-2 fine trimmings are performed to complete the mortise and tenon wire cutting processing;

[0017] 6) Perform mortise and tenon broaching on the turbine disc after wire cutting. The turbine disc after wire cutting is subjected to mortise and tenon broaching on a CNC broaching machine to complete all processing of the parts.

[0018] Matters not covered by the present invention are known technologies.

[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for processing a powder alloy turbine disc tenon groove at low cost and high quality, comprising the following steps: Step 1, establish the shape of the mortise and tenon according to the mean difference, and complete the establishment of the mortise and tenon mean difference model according to the design requirements; Step 2, design the preliminary shape of the mortise and tenon wire cutting, and perform uniform allowance offset and trimming according to the final contour of the mortise and tenon to complete the establishment of the preliminary shape; Step 3, design the final shape of the mortise and tenon wire cutting, and fine-tune the local concave fillet according to the preliminary shape of the mortise and tenon wire cutting completed in step 2; Step 4, complete the finishing and broaching shape of the mortise and tenon, and determine the broaching shape according to the final shape of the design drawing and step 3; Step 5, performing mortise and tenon wire cutting processing on the turbine disc, and performing mortise and tenon wire cutting processing according to the final shape of the wire cutting; Step 6, perform mortise and tenon broaching on the turbine disc after wire cutting, perform broaching on the remaining shape based on the mortise and tenon shape completed in step 5, and complete all processing of the parts.

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