Device and method for machining nuclear power cylindrical forgings

Abstract

The invention provides a device and method for machining nuclear power cylindrical forgings. The device comprises a chuck and a tool rest, the chuck is provided with a clamping jaw, the tool rest is provided with a tool bar, the tool bar is connected with one end of a cutting edge part, and the other end of the cutting edge part is connected with a 75-degree turning blade and an R6 circular blade. The center distance between the 75-degree turning blade and the R6 circular blade is 30 mm, and the gap between the left end face of the 75-degree turning blade and the left end face of the R6 circular blade is 0.5 mm. According to the method, all the procedures of the nuclear power barrel forgings are combined and executed according to the number of turning blades, the duration of one or more machining procedures is shortened, the machining efficiency of a machine tool in unit time is doubled, the duration of the machining procedures is halved, and the manufacturing efficiency of the nuclear power barrel forgings can be improved by more than 20%.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a device and a processing method for processing nuclear power cylindrical forgings. Background Art

[0002] With the steady advancement of the national nuclear power industry, the localization of nuclear power equipment manufacturing capabilities need to keep up with the pace of domestic nuclear power construction. Nuclear power equipment manufacturing companies need to quickly meet the high standards and high requirements of nuclear power construction. In the pursuit of "quantity improvement" and "quality assurance" of high-end manufacturing, improving the processing quality and efficiency of large nuclear power forgings is a strategic need for the transformation and upgrading of nuclear energy equipment in my country's high-end equipment manufacturing industry.

[0003] After smelting, forging, rough machining and performance heat treatment, large nuclear power forgings need to be fine-machined to meet the needs of subsequent container product assembly and welding. Taking a certain core nuclear power plant as an example, each unit requires a total of 8 evaporator main forgings / unit, a total of 3 units; a total of 5 stabilizer forgings / unit, a total of 1 unit; a total of 177 nuclear power forging processing tasks are undertaken.

[0004] According to the 12 nuclear power cylinder forgings that have been completed after heat treatment, subsequent processing needs to be completed on the vertical lathe; according to statistics, the processing time of each vertical lathe for nuclear power cylinder section forgings is 96-208h / piece, with an average of 144h / piece. The time required for the vertical lathe to complete the processing process after heat treatment of 177 nuclear power cylinder forgings is: 177×144 / 24=1062 (days).

[0005] Due to equipment and personnel limitations, there is a bottleneck in significantly increasing the number of machine operations. In order to ensure the production of nuclear power forgings, it is necessary to optimize the processing process and improve processing efficiency while ensuring processing quality.

[0006] The traditional post-heat treatment processing technology for nuclear power cylinders uses a CNC vertical lathe. After alignment and compaction, the cylinder is processed in the following modes: rough machining, semi-finishing, and finishing to meet the design and manufacturing requirements. This method requires multiple processes to process the workpiece, which is time-consuming and has low processing efficiency. Summary of the invention

[0007] The technical problem solved by the invention is to provide a device and a method for processing nuclear power cylindrical forgings, which can reduce the number of turning times and improve work efficiency.

[0008] The technical solution adopted by the present invention to solve its technical problem is:

[0009] A device for processing nuclear power cylindrical forgings comprises a chuck and a tool holder, wherein the chuck is provided with a claw, and the tool holder is provided with a tool rod, one end of a cutting edge portion is connected to the tool rod, and the other end of the cutting edge portion is connected to a 75° turning blade and an R6 circular blade, wherein the center distance between the 75° turning blade and the R6 circular blade is 30 mm, and the gap between the left end face of the 75° turning blade and the left end face of the R6 circular blade is 0.5 mm.

[0010] The width of the tool bar is H, where H=50 mm. A flank surface is provided on the cutting edge portion, and the flank surface is inclined by 1° along the direction of the width H.

[0011] The tool bar and the cutting edge portion are an integrally formed structure, the 75° turning blade is fixed to the cutting edge portion by bolts, and the R6 circular blade is fixed to the cutting edge portion by bolts.

[0012] A processing method of a device for processing nuclear power cylindrical forgings comprises the following steps:

[0013] S1. Clamp the nuclear power cylinder forging onto the chuck of the CNC vertical lathe workbench, align it symmetrically in the shape of a cross, and clamp the nuclear power cylinder forging tightly with the clamping claws;

[0014] S2. Install a rough machining tool on the tool holder to perform rough machining on the cylinder;

[0015] S3, replace the tool, replace the rough machining tool with a tool bar, and perform semi-finishing and finishing processes on the nuclear power cylinder forgings;

[0016] S5, the 75° turning blade on the tool bar performs semi-finishing on the nuclear power cylinder forging; at the same time, the R6 round blade on the tool holder performs finish machining on the nuclear power cylinder forging, and the tool holder performs semi-finishing and finish machining on the nuclear power cylinder forging simultaneously;

[0017] S6. Complete the semi-finishing and finishing processes of the nuclear power cylinder forgings at one time according to the CNC program;

[0018] S7. After the processing is completed, the clamping claw releases the nuclear power cylinder body forging and separates the nuclear power cylinder body forging from the chuck.

[0019] The beneficial effects of the present invention are:

[0020] 1. By assembling a 75° turning blade and an R6 circular blade on a tool bar at the same time, after the heat treatment of the nuclear power cylinder forgings, the front 75° turning blade performs the semi-finishing process, and the rear R6 circular blade performs the finishing process, forming a "multiple blades on one tool body" cutting mode, which can combine the various processes of nuclear power cylinder forgings with the number of turning blades, reduce the length of one or more processing processes, double the machine tool processing efficiency per unit time, and halve the processing process time, which can improve the manufacturing efficiency of nuclear power cylinder forgings by more than 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is the front structural schematic diagram of the tool bar;

[0023] Figure 3 It is a schematic diagram of the upward structure of the knife bar;

[0024] Figure 4 It is a schematic diagram of the left structure of the tool bar.

[0025] As shown in the figure: 1-chuck; 2-claw; 3-tool holder; 4-tool bar; 5-cutting edge; 6-75° turning blade; 7-R6 round blade; 8-flank surface; 9-nuclear power cylinder forging. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Example

[0028] like Figures 1 to 4 As shown, a device for processing nuclear power cylindrical forgings includes a chuck 1 and a tool holder 3, wherein the chuck 1 is provided with a claw 2, and the tool holder 3 is provided with a tool rod 4, wherein one end of a cutting edge portion 5 is connected to the tool rod 4, and the other end of the cutting edge portion 5 is connected to a 75° turning blade 6 and an R6 circular blade 7, wherein the center distance between the 75° turning blade 6 and the R6 circular blade 7 is 30 mm, and the gap between the left end face of the 75° turning blade 6 and the left end face of the R6 circular blade 7 is 0.5 mm.

[0029] The width of the tool bar 4 is H, where H=50 mm. A flank surface 8 is provided on the cutting edge portion 5, and the flank surface 8 is inclined along the direction of the width H by 1°.

[0030] The tool rod 4 and the cutting edge portion 5 are an integrally formed structure, the 75° turning blade 6 is fixed to the cutting edge portion 5 by bolts, and the R6 circular blade 7 is fixed to the cutting edge portion 5 by bolts.

[0031] A processing method of a device for processing nuclear power cylindrical forgings comprises the following steps:

[0032] S1, clamp the nuclear power cylinder forging 9 onto the chuck 1 of the CNC vertical lathe workbench, and align it symmetrically in a cross shape, and clamp the nuclear power cylinder forging 9 with the clamping claw 2;

[0033] S2, a rough machining tool is installed on the tool holder 3 to perform rough machining on the cylinder;

[0034] S3, replacing the tool, replacing the rough machining tool with the tool bar 4, and performing the semi-finishing process and the finishing process on the nuclear power cylinder forging 9;

[0035] S5, the 75° turning blade 6 on the tool bar 4 performs semi-finishing machining on the nuclear power cylinder forging 9; at the same time, the R6 round blade 7 on the tool holder 3 performs finish machining on the nuclear power cylinder forging 9, and the tool holder 3 performs semi-finishing machining and finish machining on the nuclear power cylinder forging 9 simultaneously;

[0036] S6, completing the semi-finishing and finishing processes of the nuclear power cylinder forging 9 at one time according to the numerical control program;

[0037] S7, after the processing is completed, the claw 2 releases the nuclear power cylinder forging 9, and the nuclear power cylinder forging 9 is separated from the chuck 1.

[0038] The cutting depth during the roughing process is generally 8-10mm, the cutting depth during the semi-finishing process is 1-2mm, and the cutting depth during the finishing process is 0.5-1mm. Each process is processed in sequence;

[0039] Considering that the cutting depth of each processing procedure has a certain impact on the strength of the machine tool and the rigidity of each component, we choose to adopt a cutting mode with two blades on one cutter to merge the semi-finishing process with the finishing process.

[0040] 75° turning blade 6 is suitable for the semi-finishing process of nuclear power cylinder forging 9, and R6 round blade 7 is suitable for the finishing process of nuclear power cylinder forging 9; in order to combine the semi-finishing process and the finishing process of nuclear power cylinder forging 9, it is necessary to combine the 75° turning tool bar and the R6 turning tool bar, and the combined turning tool bar can be equipped with the 75° turning tool and the R6 turning tool at the same time.

[0041] If drilling is performed on the 75° tool bar and the R6 tool bar respectively, the 75° tool bar and the R6 tool bar are fixed with M16 bolts and nuts, and then the assembled tool device is placed on a CNC vertical lathe for tool testing, as shown in Appendix 1 Figure A, in order to verify the feasibility of the "double blades on one tool body" solution.

[0042] After tool testing, it was found that the two types of tools in the assembled turning tool device can basically perform processing tasks normally, and the chips do not interfere with or entangle each other during the processing. However, due to the poor stability of the screw-jointed structure and the presence of a certain gap, vibration will occur during the cutting process, and coarse vibration marks will appear on the processed surface, as shown in Figure B in Appendix 1.

[0043] According to the conclusion of practical verification, a tool device was designed to merge the 75° turning tool bar with the R6 turning tool bar: a 75° turning blade 6 for the semi-finishing process is placed under the turning tool bar involved in cutting; an R6 round blade 7 for the finishing process is placed above, and the tool bar 4 and the cutting edge 5 are integrally formed.

[0044] It is achieved that one turning tool bar 4 can be equipped with a 75° turning blade 6 and an R6 circular blade 7 at the same time. When performing the post-heat treatment processing of the nuclear power cylinder forging, the front 75° turning blade 6 performs the semi-finishing process, and the rear R6 circular blade 7 performs the finishing process.

[0045] The tool cutting test found that the strength of the "integrated double-edged" tool body was significantly improved, and the surface chattering was eliminated after processing. However, due to the influence of the tool body edge inclination angle, the chip removal direction of the R6 finishing tool is upward, and its iron chips will cause scratches on the processed surface, as shown in Figure C in Appendix 1.

[0046] In order to reduce the scratches on the finished surface caused by iron chips, the angles of various parts of the tool body were fine-tuned: the tool body plane was controlled at a 1° bevel, the R6 rear tool tip angle was changed from 0° to 1°, and the chip removal direction of the R6 turning tool was changed.

[0047] The application of this device can use the 75° turning blade 6 and the R6 round blade 7 to process the nuclear power cylinder forging 9, and complete the semi-finishing and finishing processes of the nuclear power cylinder forgings on the CNC vertical lathe at one time, which greatly improves the processing efficiency and successfully realizes the merger of the cylinder semi-finishing process and the finishing process. The processing is carried out at the same time, which reduces the time of tool change and re-processing.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for processing nuclear power cylindrical forgings, comprising a chuck (1) and a tool holder (3), characterized in that: The chuck (1) is provided with a clamping claw (2), the tool holder (3) is provided with a tool rod (4), one end of a cutting edge portion (5) is connected to the tool rod (4), the other end of the cutting edge portion (5) is connected to a 75° turning blade (6) and an R6 circular blade (7), the center distance between the 75° turning blade (6) and the R6 circular blade (7) is 30 mm, and the gap between the left end surface of the 75° turning blade (6) and the left end surface of the R6 circular blade (7) is 0.5 mm.

2. The device for processing nuclear power cylindrical forgings according to claim 1, characterized in that: The width of the tool bar (4) is H, where H=50 mm. The cutting edge portion (5) is provided with a flank surface (8), and the flank surface (8) is inclined at 1° in the direction of the width H.

3. The device for processing nuclear power cylindrical forgings according to claim 1, characterized in that: The tool rod (4) and the cutting edge portion (5) are an integrally formed structure; the 75° turning blade (6) is fixed to the cutting edge portion (5) by means of bolts; and the R6 circular blade (7) is fixed to the cutting edge portion (5) by means of bolts.

4. A processing method for a nuclear power cylindrical forging processing device as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: S1, clamping the nuclear power cylinder body forging (9) onto the chuck (1) of the CNC vertical lathe workbench, and aligning it symmetrically in a cross shape, and clamping the nuclear power cylinder body forging (9) with the clamping claw (2); S2, a rough machining tool is mounted on the tool holder (3) to perform rough machining on the cylinder body; S3, replacing the tool, replacing the rough machining tool with the tool bar (4), and performing a semi-finishing process and a finishing process on the nuclear power cylinder forging (9); S5, the 75° turning blade (6) on the tool bar (4) performs semi-finishing processing on the nuclear power cylinder forging (9); at the same time, the R6 circular blade (7) on the tool holder (3) performs fine processing on the nuclear power cylinder forging (9), and the tool holder (3) performs semi-finishing processing and fine processing on the nuclear power cylinder forging (9) simultaneously; S6, completing the semi-finishing and finishing processes of the nuclear power cylinder forging (9) at one time according to the numerical control program; S7. After the processing is completed, the clamping claw (2) releases the nuclear power cylinder body forging (9) and separates the nuclear power cylinder body forging (9) from the chuck (1).

Images