Combined cutter for machining radial raceway of rotary table bearing and machining method thereof

Abstract

The present application relates to bearing product soft and hard machining tool and machining method, specifically relates to the combined tool for radial raceway machining of rotary disc bearing and the machining method thereof, the combination includes: integrally formed tool handle and two tool rods, the same end of two tool rods intersects and is connected to one end of the tool handle, and the included angle is formed between the two tool rods; the other end of two tool rod is free end and is connected with blade respectively; the tool path of the combined tool is that the upper blade tool path and the lower blade tool path; the tool path of the upper blade is: upper groove R angle-radial raceway upper rib-upper oil groove-retreat tool; the tool path of the lower blade is: lower groove R angle-radial raceway lower rib-lower oil groove-retreat tool.The tool and machining method of the present application can more effectively solve the machining problem of wind power three-row cylindrical rotary support soft and hard machining rib and oil groove, realize four kinds of working condition machining with one tool and one clamping station, and improve the comprehensive machining efficiency by more than 35%.

Description

Technical Field

[0001] This invention relates to cutting tools and methods for machining bearing products, specifically to a combination tool and method for machining the radial raceway of a slewing bearing. It is applied to the double flanges and double oil grooves in the vertical direction of the radial raceway of a large wind turbine three-row cylindrical slewing bearing, and belongs to the field of bearing machining technology. Background Technology

[0002] The shape and dimensions of the radial raceway flanges and oil grooves in large slewing bearing components are key evaluation indicators for the service life of the radial raceway. Previously, four cutting tools (such as...) were used. Figure 1 The tools are clamped on four tool holders to complete the machining process. The increase in tools has caused problems with the effective number of tool holders (tool magazines) and positioning accuracy, tool procurement costs, manufacturing efficiency and manufacturing quality. There are 5-6 common types of rotary slewing bearings, and nearly 30 commonly used cutting tools are involved in the soft and hard turning processes. Neither a 12-station tool magazine (maximum holding 24 tools) nor a 4-station turret tool post (maximum holding 8 tools) can meet the requirement of clamping all tools in one go. Frequent tool disassembly and reassembly is a major pitfall in CNC machining, making it impossible to establish a proper machining system. Taking the soft and hard turning of three rows of cylindrical radial raceways in wind turbine pitch control as an example, a total of 11 cutting tools are used. If not arranged scientifically, this will not only increase the number of tools but also lead to a decrease in production efficiency and product manufacturing quality. Specifically, the following problems exist: 1. The tooling used is 6 for soft-cars and 5 for hard-cars, making it impossible to clamp all the tools. 2. Repeated tool disassembly leads to frequent changes in tool zero deviation and tool compensation, making it impossible to form a stable tool deviation system, and thus processing efficiency and product quality cannot be guaranteed. 3. The large number of tool holders leads to increased tool procurement costs; 4. Frequent tool changes not only test the repeatability of the equipment, but also increase the time required for auxiliary tool changes.

[0003] Only by avoiding the above four points can we ensure the establishment of a radial raceway soft and hard machining process system, and only then can product quality become stable. Summary of the Invention

[0004] In view of the existing technical problems, the purpose of this invention is to provide a combination tool and its machining method for machining the radial raceway of turntable bearings. It adopts the concept of multi-purpose machining with one tool, which can realize the one-time machining of soft and hard turning operations with one tool. The tool is suitable for any tool holder or tool magazine, and can realize the completion of four working conditions with one tool and one clamping station.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a combined tool for machining the radial raceway of a turntable bearing, comprising: an integrally formed tool holder and two tool bars, the same end of the two tool bars intersecting and connected to one end of the tool holder, and the two tool bars forming an included angle; the other end of the two tool bars is a free end and is respectively connected with a cutting blade; Furthermore, the two tool holders and the tool shank form a "Y" shape, with the other end of the tool shank used to connect to the tool post; Furthermore, the included angle between the two tool holders is set to 100°; Furthermore, the two tool holders have the same structure and are symmetrically arranged with respect to the center line of the tool holder length direction; Furthermore, the blades on the two tool holders are provided with blade grooves, and the two blades adopt the same groove shape, with the blades inserted into the ends of the tool holders.

[0006] Furthermore, one of the two tool holders is equipped with a soft turning insert, which is a standard insert; the other tool holder is equipped with a hard turning insert, which is a modified soft turning insert that has been scrapped. This not only standardizes the insert mounting slot type but also reduces tool consumption costs. The two identical tool holders are equipped with inserts of different functions, thereby reducing the types and quantities of inserts. The above-mentioned tool eliminates the original four left and right offset slot tool holders and replaces them with a single tool holder with two ends, which can save three tool clamping stations, achieving the practical application effect of reducing clamping station occupation without reducing the functionality.

[0007] This invention uses a combination of two blades of two types, suitable for wind power three-row cylindrical turntable bearings. The outer diameter of the three rows of shaft rings of the turntable bearing includes a radial raceway, an upper and a lower retaining edge located above and below the radial raceway, and upper and lower oil grooves that are respectively connected to the radial raceway by the upper and lower retaining edges. When the cutting tool with the above structure is used in conjunction with a three-row cylindrical bearing, the cutting tool for machining the upper flange area of ​​the radial raceway is the upper cutting tool, and the cutting tool for machining the lower flange area of ​​the radial raceway is the lower cutting tool. The tool holder connecting the upper blade forms a 40° angle with the surface being machined on the upper stop; the tool holder connecting the lower blade forms a 40° angle with the surface being machined on the lower stop.

[0008] The machining method of this combination tool includes: upper insert feed and lower insert feed; The tool path of the upper cutting edge is: upper groove R-angle -- upper side of radial raceway -- upper oil groove -- retraction; the tool path of the lower cutting edge is: lower groove R-angle -- lower side of radial raceway -- lower oil groove -- retraction.

[0009] The four machining operations of this combination tool include: hard turning: hard turning of the upper flange and front and rear areas of the radial raceway of the shaft ring with cutting inserts, and hard turning of the lower flange and front and rear areas of the radial raceway of the shaft ring with cutting inserts; soft turning: soft turning of the upper flange and front and rear areas of the radial raceway of the shaft ring with cutting inserts, and soft turning of the lower flange and front and rear areas of the radial raceway of the shaft ring with cutting inserts; thus, one tool and one clamping station can complete the machining of the four operations.

[0010] The beneficial effects of this invention are: Compared to the original four offset grooving tool holders, the tool using a single tool with two tool holders has the following advantages: 1. Reduce the number of clamping stations without reducing functionality; 2. Use different functional blades on the same blade holder to reduce the types and number of blades; 3. The hard turning insert base is made from scrapped soft turning inserts, which can not only unify the insert mounting slot shape, but also reduce tool consumption costs; 3. A brand-new toolpath enables multi-surface machining to be completed in one pass; 4. The upper and lower flanges and oil grooves are tightly connected, and all processing can be completed in place, resulting in higher processing accuracy (effectively avoiding the loss of accuracy due to repeated positioning caused by tool changes). Compared with traditional methods, it can save processing time and is more conducive to expanding the extreme processing range of the equipment.

[0011] The cutting tools and machining methods of this invention can more effectively solve the machining problems of soft and hard cutting edges and oil grooves of three-row cylindrical slewing bearings for wind power. It enables four machining conditions to be completed with one cutting tool and one clamping station, and improves the overall machining efficiency by more than 35%. The establishment of the cutting tool system enables the average machining accuracy to reach within 0.03mm. It also provides a brand-new solution and plan for the establishment of CNC vertical lathe cutting tool system, which has high application value and social value. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a traditional application tool.

[0013] Figure 2 This is a schematic diagram of a three-row cylindrical radial raceway structure.

[0014] Figure 3 This is a schematic diagram of the machining state of the combined cutting tool of the present invention.

[0015] Figure 4 This is a schematic diagram of the machining path of the combined cutting tool of the present invention.

[0016] In the diagram, 1. Three rows of shaft rings, 2. Radial raceway, 3. Upper flange, 4. Lower flange, 5. Upper oil groove, 6. Lower oil groove, 7. Tool holder, 8. Tool bar, 9. Upper blade, 10. Lower blade, 11. Upper groove opening R angle, 12. Lower groove opening R angle. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] The combined tool of this embodiment is for machining the radial raceway (flange and oil groove) of the bearing ring of a three-row cylindrical turntable bearing in wind power. The combined tool includes: an integrally formed tool holder 7 and two tool bars 8. The same end of the two tool bars 8 intersects and is connected to one end of the tool holder 7, and the two tool bars 8 form an included angle; the other end of the two tool bars 8 is a free end and is respectively connected with a cutting blade. Furthermore, the two tool holders 8 and the tool shank 7 form a "Y" shape, and the other end of the tool shank 7 is used to connect to the tool post; Furthermore, the included angle between the two tool holders 8 is set to 100°; Furthermore, the two tool holders 8 have the same structure and are symmetrically arranged with respect to the center line of the tool holder 7 along its length direction; Furthermore, the blades on the two tool holders 8 are provided with blade grooves, and the two blades adopt the same groove shape. The blades are inserted into the ends of the tool holders 8.

[0019] Furthermore, a soft turning insert is provided on one of the two tool holders 8, and the soft turning insert is a standard insert; a hard turning insert is provided on the other tool holder 8. The outer diameter of the three rows of shaft rings 1 of the slewing bearing specifically includes the radial raceway 2, the upper flange 3 and the lower flange 4 located above and below the radial raceway 2, and the upper oil groove 5 and the lower oil groove 6 that are respectively connected to the radial raceway 2 by the upper flange 3 and the lower flange 4. When the cutting tool with the above structure is used in conjunction with a three-row cylindrical bearing, the cutting tool for machining the upper flange 3 area of ​​the radial raceway is the upper cutting tool 9, and the cutting tool for machining the lower flange 4 area of ​​the radial raceway is the lower cutting tool 10. The machining method of this combination tool includes: the upper insert 9 moves and the lower insert 10 moves; The tool path of the upper blade 9 is: upper groove R angle 11 -- radial raceway upper stop 3 -- upper oil groove 5 -- retraction; the tool path of the lower blade 10 is: lower groove R angle 12 -- radial raceway lower stop 4 -- lower oil groove 6 -- retraction.

[0020] This combination of cutting tools is used to sequentially perform machining operations on four different bearing rings, including: Hard turning process: The upper flange 3 and the front and rear areas of the radial raceway of the shaft ring are machined using hard turning inserts of the cutting tool. The lower flange 4 and the front and rear areas of the radial raceway of the shaft ring are also machined using hard turning inserts of the cutting tool. Soft turning process: The soft turning insert of the tool is used to machine the upper flange 3 and the front and rear areas of the radial raceway of the shaft ring, and the soft turning insert of the tool is used to machine the lower flange 4 and the front and rear areas of the radial raceway of the shaft ring.

[0021] Compared with traditional methods, the tool and machining method invented in this paper are clearly more effective in solving the machining problems of soft and hard cutting edges and oil grooves of three-row cylindrical slewing bearings for wind power. It enables four machining conditions to be completed with one tool and one clamping station, and improves the overall machining efficiency by more than 35%. The establishment of the tool system has enabled the average machining accuracy to reach within the range of 0.03mm. It also provides a brand-new solution and plan for the establishment of CNC vertical lathe tool system, which has high application value and social value.

Claims

1. A method for machining the radial raceway of a slewing bearing, comprising a combination tool for machining the radial raceway of a slewing bearing, including: The tool holder is made in one piece and consists of two blades. The same end of the two blades intersects and is connected to one end of the tool holder, forming an angle between the two blades. The other end of the two blades is a free end and is connected to a blade respectively. The two tool holders and the tool shank form a "Y" shape, and the other end of the tool shank is used to connect to the tool post; The included angle between the two tool holders is set to 100°; The two tool holders have the same structure and are symmetrically arranged with the center line of the tool holder length direction as the reference point; The blades on the two tool holders are provided with blade grooves, and the two blades have the same groove shape. The blades are inserted into the ends of the tool holders. One of the two tool holders is equipped with a soft turning insert, and the other tool holder is equipped with a hard turning insert; The outer diameter of the three rows of rings in the slewing bearing includes a radial raceway, an upper flange and a lower flange located above and below the radial raceway, and upper and lower oil grooves that respectively transition between the upper flange and the lower flange and the radial raceway; characterized in that: When the cutting tool is used in conjunction with the bearing, the cutting tool for machining the upper flange area of ​​the radial raceway is the upper cutting tool, and the cutting tool for machining the lower flange area of ​​the radial raceway is the lower cutting tool. The tool holder connecting the upper blade forms a 40° angle with the surface being machined on the upper stop; the tool holder connecting the lower blade forms a 40° angle with the surface being machined on the lower stop. The upper cutting edge and the lower cutting edge move together. The cutting path of the upper cutting edge is: upper groove R-angle -- upper side of radial raceway -- upper oil groove -- retraction. The cutting path of the lower cutting edge is: lower groove R-angle -- lower side of radial raceway -- lower oil groove -- retraction.

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