A machining process for a GH1131 high-temperature alloy arc-shaped plate part

Abstract

The present application relates to a kind of GH1131 high-temperature alloy arc plate class parts processing technology, it includes the following steps: S1, milling upper and lower plane;S2, rough milling plate four around edge;S3, processing two end waist shape step hole;S4, milling two side face pipe type groove;S5, semi-finish milling arc surface;S6, finish milling four around edge;S7, finish milling arc;The process greatly improves the processing efficiency of GH1131 high-temperature alloy wall plate class parts, prolongs tool life, greatly reduces tool cost, improves part product pass rate, satisfies actual production.

Description

Technical Field

[0001] This invention relates to the field of nuclear energy manufacturing and processing, specifically to a processing technology for GH1131 high-temperature alloy arc-shaped plate parts. Background Technology

[0002] High-temperature alloys are widely used in aerospace, nuclear energy, and petrochemical fields due to their high temperature resistance, corrosion resistance, and high strength.

[0003] GH1131 alloy is a iron-based superalloy strengthened by solid solution with elements such as W, Mo, Nb, and N. It possesses excellent thermal strength, thermal stability, and thermal fatigue resistance, and is a typical difficult-to-machine material. Its machinability is mainly reflected in the following aspects: ① The yield strength of GH1131 high-temperature alloy is approximately 1300 MPa, and its hardness is approximately 40 HRC. Therefore, it requires high-power machining equipment and high-strength cutting tools. ② GH1131 high-temperature alloy has high plasticity and elongation. The austenite in the alloy has a high lattice slip coefficient, resulting in large plastic deformation and a large cutting deformation coefficient. ③ Under high temperature and high stress, the unstable austenite in GH1131 high-temperature alloy will partially transform into martensite, and the strengthening phase will also decompose from the solid solution and be dispersed. In addition, the dispersed distribution after compound decomposition will lead to surface strengthening and increased hardness of the material. After machining, the hardening degree of the high-temperature alloy can reach 200% to 500%. ④ GH1131 high-temperature alloy itself has high strength, large plastic deformation, large cutting force, high power consumption, and generates a lot of heat, while its thermal conductivity is relatively low, causing the temperature in the cutting zone to rise sharply in a short period of time. Meanwhile, the short contact length between the tool and the chip causes cutting heat to accumulate in a small area near the cutting edge, making it difficult to dissipate. This exacerbates tool wear. ⑤ GH1131 high-temperature alloy has a high cutting temperature and poor thermal conductivity, making the workpiece prone to thermal deformation, thus making it difficult to guarantee accuracy.

[0004] The above-mentioned machining characteristics of GH1131 high-temperature alloy determine that its machining process places higher demands on machine tools, cutting tools, and machining methods. In addition to selecting high-power cutting machine tools and equipping them with suitable cutting tools, it is even more necessary to research and propose a scientific, economical, and efficient process solution. Summary of the Invention

[0005] Based on the above description, the present invention provides a processing technology for GH1131 high-temperature alloy arc-shaped plate parts to solve the technical problem that the processing of arc-shaped plate parts is difficult due to the high strength, high hardness, high friction coefficient and low thermal conductivity of GH1131 high-temperature alloy material.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A machining process for GH1131 high-temperature alloy arc-shaped plate parts includes the following steps: S1, Milling the upper and lower planes: Provide a GH1131 high-temperature alloy plate to be processed. According to the edge line of the inner arc and the vertex line of the outer arc of the arc plate, use a face milling cutter to process the two sides of the plate into an inner plane and an outer plane in layers. The inner plane is coplanar with the edge line of the inner arc, and the outer plane is tangent to the outer arc surface at the vertex line of the outer arc. S2, rough milling of the four perimeters of the plate: using the universal angle milling head of the CNC milling machine, keeping the tool holder direction perpendicular to the surface to be machined, and using a face milling cutter to mill in layers; S3, Machining the waist-shaped stepped holes at both ends: Using the universal angle milling head of the CNC milling machine, keep the cutter axis parallel to the hole axis, first use a drill bit to drill a row of holes on the side of the plate near both ends, and then remove the residue from the hole wall; S4, Milling tubular grooves on both sides: Using the universal angle milling head of the CNC milling machine, keep the spindle axis perpendicular to the side plate, use a ball end mill to process the tubular grooves and deepen them according to the side allowance; S5, semi-finish milled curved surface; S6, precision milling of four perimeters: using the universal angle milling head of a CNC milling machine, the four perimeters of the plate are machined to the required position using a face milling cutter; S7, finish milling of curved surfaces: using a slot milling cutter head, keeping the cutter axis direction parallel to the axis of the curved surface being machined, milling in layers along this axis with each layer making a circular arc motion, so that the side edge of the slot milling cutter head mills the curved surface.

[0007] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: The machining process provided in this application first mills the inner and outer planes without machining the curved surface, which can effectively reduce workpiece deformation. A semi-finish milling is arranged before finish milling the curved surface, which can effectively reduce the amount of material removed during finish milling of the curved surface, improve surface quality, and reduce part deformation. During finish milling, a slot milling cutter is used to mill in layers along the axis of the curved surface being machined, and each layer moves in an arc. This allows the side edge of the slot milling cutter to mill the curved surface, which is beneficial to improving surface quality and reducing roughness value. This process greatly improves the machining efficiency of GH1131 high-temperature alloy wall panel parts, extends tool life, significantly reduces tool costs, improves the product qualification rate, and meets the actual production requirements.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the layered milling using a face milling cutter in step S1 includes alternating milling of both sides of the plate by flipping them multiple times.

[0010] Furthermore, the alternating milling process involves removing a maximum of 2mm from one side, with each side being flipped once.

[0011] Furthermore, the face milling cutter in step S1 is an indexable multi-tooth cutter with a diameter of 80mm, and the matching insert is coated with a CVD coating of TiCrN+Al2O3+TiN. The milling parameters are spindle speed S=130 r / min, feed F=480±5mm / min, and maximum depth of cut Ap=1±0.1mm.

[0012] Furthermore, in step S3, the drill bit is a 20mm diameter internally cooled indexable U-drill, and the removal of hole wall residue is carried out by using a spiral end mill with layered cutting to remove the hole wall residue. The spiral end mill is a 20mm diameter integral tool.

[0013] Furthermore, the ball end mill in step S4 is a solid cutter with a diameter of 13mm.

[0014] Furthermore, in step S5, the semi-finish milling includes using an 80mm diameter round nose cutter and programming a three-axis depth profile milling process to perform layered cutting with a constant depth of cut.

[0015] Furthermore, in step S6, the processing of the four perimeters of the plate includes leaving a 0.3 to 0.5 mm allowance to compensate for the processing based on the actual measured dimensions to ensure the size of the part.

[0016] Furthermore, in step S7, the slot milling cutter is an indexable tool with a diameter of 315mm, and the matching insert is coated with a CVD coating of TiCrN+Al2O3+TiN. The parameters for finish milling are: spindle speed S: 250±5r / min, feed F: 600±5mm / min, and the preferred maximum depth of cut Ap=0.3mm. Attached Figure Description

[0017] Figure 1 A schematic diagram illustrating the processing steps of a GH1131 high-temperature alloy arc-shaped plate part provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the blank structure of a GH1131 high-temperature alloy sheet provided in an embodiment of the present invention; Figure 3 for Figure 2 A schematic diagram of the structure of the blank after step S1; Figure 4 This is a schematic diagram of the machining state of the four perimeters of the plate in step S2; Figure 5 This is a schematic diagram of the sheet metal structure after the S3 machining process has resulted in waist-shaped stepped holes at both ends. Figure 6 This is a schematic diagram of the machining state of the semi-finish milled arc surface in step S5; Figure 7 This is a schematic diagram of the machining state for the precision milling of the arc surface in step S7; Figure 8 This is a schematic diagram of a finished GH1131 high-temperature alloy arc-shaped plate part processed using the processing technology of this invention. Detailed Implementation

[0018] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0020] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90° or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0021] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0022] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0023] like Figure 1As shown in the figure, this application discloses a processing technology for GH1131 high-temperature alloy arc-shaped plate parts, which includes the following steps: S1, Milling the upper and lower planes: A GH1131 high-temperature alloy sheet is provided for processing. Following the edge line of the inner arc and the vertex line of the outer arc, a face milling cutter is used to mill the two sides of the sheet into an inner plane 11 and an outer plane 12 in layers. The inner plane 11 is coplanar with the edge line of the inner arc, and the outer plane 12 is tangent to the outer arc surface at the vertex line of the outer arc. The sheet after step S1 is as follows: Figure 3 As shown.

[0024] The GH1131 high-temperature alloy sheet to be processed is a rectangular plate, the size of which encompasses the entire spot product. The sheet blank structure is as follows: Figure 2 As shown, the face milling cutter is an indexable multi-tooth cutter with a direct dimension of 80mm. The matching inserts are coated with a CVD coating of TiCrN+Al2O3+TiN. The milling parameters are: spindle speed S=130 r / min, feed F=480mm / min, feed error not exceeding 5mm, maximum depth of cut Ap=1±0.1mm, and maximum depth of cut error not exceeding 0.1mm.

[0025] The inner plane 11 and outer plane 12 are milled by alternating milling with multiple flips on both sides, ensuring that at most 2mm is removed from each side and flipping is done once. This can make the workpiece be subjected to uniform force and reduce workpiece deformation.

[0026] S2, rough milling of the four perimeters of the plate: using the universal angle milling head of the CNC milling machine, keeping the tool holder direction perpendicular to the surface to be machined, and using a face milling cutter to mill in layers; Because the workpiece's side surface is not perpendicular to the horizontal plane, the universal angle milling head of a five-axis CNC gantry milling machine is used to adjust the angle according to the angle between the end face, side surface, and horizontal plane, ensuring the tool holder direction is perpendicular to the machined surface; layered milling is performed using a face milling cutter, such as... Figure 4 As shown.

[0027] S3, Machining the waist-shaped stepped holes at both ends: Using the universal angle milling head of the CNC milling machine, keep the cutter axis parallel to the hole axis, first use a drill bit to drill a row of holes on the side of the plate near both ends, and then remove the residue from the hole wall; Since the waist-shaped stepped hole is not perpendicular to the horizontal plane, a universal angle milling head is also used for machining, keeping the cutter axis parallel to the hole axis. The drill bit is a 20mm diameter internally cooled indexable U-drill. Residual material on the hole wall is removed using a spiral end mill with layered feed. The spiral end mill is a 20mm diameter solid tool. The workpiece structure after step S3 is as follows: Figure 5 .

[0028] S4, Milling tubular grooves on both sides: Using the universal angle milling head of the CNC milling machine, keep the spindle axis perpendicular to the side plate, use a ball end mill to process the tubular grooves and deepen them according to the side allowance; Among them, the ball end mill uses a 13mm diameter integral tool to process tubular grooves.

[0029] S5, semi-finish milled curved surface; Performing a semi-finish milling before finish milling the curved surface reduces the amount of material removed during subsequent finish machining, improving surface quality and minimizing part deformation. The semi-finish milling uses an 80mm diameter round nose cutter and is programmed with a three-axis depth profile milling process, employing layered cutting with a constant depth of cut. The machining process is illustrated in the diagram. Figure 6 .

[0030] S6, precision milling of four perimeters: using the universal angle milling head of a CNC milling machine, the four perimeters of the plate are machined to the required position using a face milling cutter; Because the curved plate has a large length and the high-temperature alloy has a high elongation, the four edges of the plate are machined to leave a 0.3-0.5 mm allowance so that the final machining can be compensated according to the actual measured size to ensure the size of the part.

[0031] S7, finish milling of curved surfaces: using a slot milling cutter head, keeping the cutter axis direction parallel to the axis of the curved surface being machined, milling in layers along this axis with each layer making a circular arc motion, so that the side edge of the slot milling cutter head mills the curved surface.

[0032] The slotting cutter is a 315mm diameter indexable tool with inserts coated with a CVD coating of TiCrN+Al2O3+TiN. The finish milling parameters are: spindle speed S: 250±5 r / min, feed F: 600±5 mm / min, and a preferred maximum depth of cut Ap = 0.3mm. This machining method is beneficial for improving surface quality and reducing roughness. The machining state is shown in the figure. Figure 7 The finished product image is as follows Figure 8 .

[0033] The processing method provided in this embodiment greatly improves the processing efficiency of GH1131 high-temperature alloy wall panel parts, extends tool life, significantly reduces tool costs, improves the product qualification rate, and meets actual production needs.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A machining process for GH1131 high-temperature alloy arc-shaped plate parts, comprising the following steps: S1, Milling the upper and lower planes: Provide a GH1131 high-temperature alloy plate to be processed. According to the edge line of the inner arc and the vertex line of the outer arc of the arc plate, use a face milling cutter to mill the upper and lower planes of the plate into an inner plane and an outer plane respectively. The inner plane is coplanar with the edge line of the inner arc, and the outer plane is tangent to the outer arc surface at the vertex line of the outer arc. S2, rough milling of the four perimeters of the plate: using the universal angle milling head of the CNC milling machine, keeping the tool holder direction perpendicular to the surface to be machined, and using a face milling cutter to mill in layers; S3, Machining the waist-shaped stepped holes at both ends: Using the universal angle milling head of the CNC milling machine, keep the cutter axis parallel to the hole axis, first use a drill bit to drill holes on the upper plane of the plate and in the area close to both ends of the plate length direction, and then remove the hole wall residue; S4, Milling tubular grooves on both sides: Using the universal angle milling head of the CNC milling machine, keep the spindle axis perpendicular to the side plate, use a ball end mill to process the tubular grooves and deepen them according to the side allowance; S5, semi-finish milled curved surface; S6, precision milling of four perimeters: using the universal angle milling head of a CNC milling machine, the four perimeters of the plate are machined to the required position using a face milling cutter; S7, fine milling of arc surfaces: using a slot milling cutter head, keeping the cutter axis direction parallel to the axis of the arc surface being machined, milling in layers along this axis with each layer making a circular arc motion, so that the side edge of the slot milling cutter head mills the arc surface; The layered milling using a face milling cutter in step S1 includes multiple alternating milling operations on the upper and lower planes of the plate; the alternating milling operation removes a maximum of 2mm from each side, and flips the plate once.

2. The processing technology for GH1131 high-temperature alloy arc-shaped plate parts according to claim 1, characterized in that, The face milling cutter in step S1 is an indexable multi-tooth cutter with a diameter of 80mm. The cutting insert is coated with a CVD coating of TiCrN+Al2O3+TiN. The milling parameters are spindle speed S=130 r / min, feed F=480±5mm / min, and maximum depth of cut Ap=1±0.1mm.

3. The processing technology for GH1131 high-temperature alloy arc-shaped plate parts according to claim 1, characterized in that, The drill bit mentioned in step S3 is a 20mm diameter internally cooled indexable U-drill. The removal of hole wall residue is carried out by using a spiral end mill with layered cutting to remove the hole wall residue. The spiral end mill is a 20mm diameter integral tool.

4. The processing technology for GH1131 high-temperature alloy arc-shaped plate parts according to claim 1, characterized in that, The ball end mill in step S4 is a solid tool with a diameter of 13mm.

5. The processing technology for GH1131 high-temperature alloy arc-shaped plate parts according to claim 1, characterized in that, The semi-finish milling in step S5 includes using an 80mm diameter round nose cutter and programming a three-axis depth profile milling process to perform layered cutting with a constant depth of cut.

6. The processing technology for GH1131 high-temperature alloy arc-shaped plate parts according to claim 1, characterized in that, In step S6, the processing of the four perimeters of the plate includes leaving a 0.3-0.5 mm allowance to compensate for the processing based on the actual measured dimensions and ensure the size of the part.

7. The processing technology for GH1131 high-temperature alloy arc-shaped plate parts according to claim 1, characterized in that, The slot milling cutter head in step S7 is an indexable tool with a diameter of 315mm. The matching inserts are coated with a CVD coating of TiCrN+Al2O3+TiN. The parameters for finish milling are: spindle speed S: 250±5r / min, feed F: 600±5mm / min, and maximum depth of cut Ap=0.3mm.

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