Drilling and milling compound tool and machining method of compressor stator shell connecting hole

Abstract

The invention discloses a drilling and milling compound tool and a machining method of a compressor stator shell connecting hole. The drilling and milling compound tool comprises a tool bar, a first connecting part and a second connecting part, and the tool bar comprises the first connecting part and the second connecting part which are arranged front and back in a spaced mode; the tool bit assembly comprises a first tool apron and a first blade, the first tool apron is detachably connected with the first connecting part, and the first blade is detachably connected with the first connecting part; the reaming and milling assembly comprises a second tool apron and a second blade, the second tool apron is detachably connected with the second connecting part, and the second blade is detachably connected with the second connecting part; the diameter of the first tool apron is smaller than that of the second tool apron. Therefore, in the process of rough machining and finish machining of the connecting hole through the drilling and milling composite tool, machining equipment and tools do not need to be replaced, only the tool bit assembly and the spot facing and milling assembly on the tool bar need to be replaced, tool setting operation is simplified, the position machining precision of the combined hole and the hole opening flat seat can be improved, and the yield and production efficiency of a machine shell are improved.

Description

Technical Field

[0001] The present application relates to the technical field of hole processing, and in particular to a drilling and milling composite tool and a method for processing a compressor stator casing connection hole. Background Art

[0002] At present, large centrifugal compressors are widely used in various fields. Among the stator components of centrifugal compressor units, the stator casing is a large, important and key processing part, which usually weighs 5 tons to 100 tons and has a large volume. Usually, the stator casing structure is in the form of upper and lower parts. The center flange of the upper casing is designed with connection holes to facilitate connection with the lower casing, wherein the connection holes include bolt holes and orifice flat seats.

[0003] At present, the processing technology of the connection hole includes rough machining and fine machining. During rough machining, a radial drilling machine is used to install a twist drill bit to rough-machine the handle hole. After completion, the countersinking bar and white steel blade are replaced. After the tool is aligned, the countersinking is performed to rough-machine the hole seat. During fine machining, a CNC gantry milling machine is used to install a U drill to machine the inner hole at a high speed to fine-machine the handle hole, and then a radial drilling machine is used to use a countersinking bar and white steel blade to fine-machine the hole seat. Due to the replacement of processing equipment and tools during rough machining and fine machining, the processing accuracy of the position of the handle hole and the hole seat is poor, resulting in a high rework rate of the stator casing. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. This part of the application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] An embodiment of the first aspect of the present application provides a drilling and milling compound tool, comprising: a tool rod, the tool rod comprising a first connecting portion and a second connecting portion spaced apart in a front and rear direction; a tool head assembly, the tool head assembly comprising a first tool seat and a first blade, the first tool seat being detachably connected to the first connecting portion, and the first blade being detachably connected to the first tool seat; a countersinking assembly, the countersinking assembly comprising a second tool seat and a second blade, the second tool seat being detachably connected to the second connecting portion, and the second blade being detachably connected to the second tool seat; wherein the diameter of the first tool seat is smaller than the diameter of the second tool seat.

[0006] Furthermore, the cutter head assembly also includes a centering drill bit, a mounting groove is provided at the top of the first tool holder, the rear end of the centering drill bit is detachably connected to the first tool holder through the mounting groove, and the top end of the centering drill bit protrudes from the first tool holder; wherein, a positioning tip is provided at the top of the centering drill bit, a cutting edge is provided on the outer peripheral side of the positioning tip, and a chip removal edge is located behind the cutting edge.

[0007] Furthermore, the first tool seat is provided with a first chip removal groove along the circumferential side from the top end, and the side wall of the first chip removal groove is provided with a first blade groove, which is located at the top end of the first tool seat and is used to install the first blade; wherein the first blade grooves are arranged in pairs with the axis of the first tool seat as the center, and the paired first blade grooves are staggered along the radial direction of the first tool seat; the first blade grooves are one pair or multiple pairs, and the sizes of the multiple pairs of first blade grooves are different.

[0008] Furthermore, the cutter head assembly also includes a third blade, and the side wall of the first chip groove is provided with a second blade groove, which is located on the peripheral side of the first tool seat and is used to install the third blade; wherein the second blade grooves are arranged in pairs with the axis of the first tool seat as the center, and the two second blade grooves arranged in pairs are staggered along the axial direction of the first tool seat.

[0009] Furthermore, a plurality of second chip grooves are arranged at intervals along the circumferential side of the top end of the second tool seat, and a third blade groove is arranged on the side wall of the second chip groove. The third blade groove is located at the top end of the second tool seat and is used to install the second blade; wherein the plurality of second blade grooves are arranged alternately along the radial direction of the second tool seat.

[0010] An embodiment of the second aspect of the present application provides a method for machining a connection hole of a compressor stator casing, which is machined using the drilling and milling composite tool of any one of the first aspects, wherein the connection hole includes a handle hole and a hole flat seat, and the method includes:

[0011] The tool bar of the drilling and milling compound tool is connected to the processing equipment, the handle hole is processed by the tool head assembly, and the hole flat seat is processed by the countersinking assembly.

[0012] Furthermore, the handlebar hole is processed by using the cutter head assembly of the drilling and milling composite tool, and the hole mouth flat seat is processed by using the countersinking assembly, which specifically includes: using the cutter head assembly to perform rough processing on the handlebar hole, and using the countersinking assembly to perform rough processing on the hole mouth flat seat; replacing the cutter head assembly and the countersinking assembly, and using the replaced cutter head assembly to perform fine processing on the handlebar hole, and using the replaced countersinking assembly to perform fine processing on the hole mouth flat seat.

[0013] Further, after the handle hole is rough-machined by the cutter head assembly and the hole mouth flat seat is rough-machined by the countersinking assembly, it specifically includes: controlling the rotation of the tool bar, and the centering drill bit of the tool head assembly performs positioning processing on the handle hole at a first cutting speed and a first feed rate; controlling the rotation of the tool bar, and the first blade of the tool head assembly performs rough-machined on the handle hole at a second cutting speed and a second feed rate; controlling the tool bar to move axially to a suitable position, and controlling the rotation of the tool bar, and the second blade of the countersinking assembly performs rough-machined on the hole mouth flat seat at a third cutting speed and a third feed rate; wherein, the first cutting speed is 80rpm-100rpm, and the first feed rate is 60mm / min-80mm / min; the second cutting speed is 200rpm-300rpm, and the second feed rate is 10mm / min-30mm / min; the third cutting speed is 20rpm-40rpm, and the third feed rate is 25mm / min-30mm / min.

[0014] Furthermore, the replaced cutter head assembly is used to finish the handle hole, and the replaced countersinking assembly is used to finish the hole mouth flat seat, specifically including: controlling the rotation of the tool rod, and the replaced first blade finishes the handle hole at the fourth cutting speed and the fourth feed rate; controlling the tool rod to move axially to a suitable position, controlling the rotation of the tool rod, and the replaced second blade finishes the hole mouth flat seat at the fifth cutting speed and the fifth feed rate; wherein, the fourth cutting speed is 300rpm-400rpm, and the fourth feed rate is 10mm / min-25mm / min; the fifth cutting speed is 30rpm-50rpm, and the fifth feed rate is 25mm / min-30mm / min.

[0015] Furthermore, there are multiple connecting holes, and the method also includes: using a drilling and milling composite tool to successively perform rough processing on the handle hole and the hole mouth flat seat of a single connecting hole; replacing the cutter head assembly and the countersinking assembly, and using the replaced cutter head assembly and the countersinking assembly to successively perform fine processing on the handle hole and the hole mouth flat seat of the single connecting hole.

[0016] The drilling and milling composite tool and the processing method of the compressor stator casing connection hole provided by the embodiment of the present application do not need to replace the processing equipment and tools during the rough processing and fine processing of the connection hole using the drilling and milling composite tool provided by the present application. Only the cutter head assembly and the countersink assembly on the tool bar need to be replaced. Compared with the rough processing and fine processing of the connection hole in the related art, which requires frequent replacement of processing equipment and tools, the steps of replacing processing equipment and tools are simplified, and the operation of re-calibrating the tool after tool change is simplified, which is conducive to improving the position processing accuracy and dimensional accuracy of the mating hole and the hole flat seat, so that the processing accuracy can meet the geometric tolerance accuracy required by the drawing, reduce the casing rework rate, and improve the casing yield rate. At the same time, the tool travel and time are greatly reduced, and the production efficiency is greatly improved.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. In addition, the same reference symbols are used throughout the accompanying drawings to represent the same components. Among them:

[0019] Figure 1 A partial structural schematic diagram of a housing and a drilling and milling compound tool after being assembled from one viewing angle provided by an embodiment of the present application is shown;

[0020] Figure 2 A cross-sectional view of a connection hole provided in an embodiment of the present application is shown;

[0021] Figure 3 A schematic structural diagram of a knife bar provided in an embodiment of the application from a first perspective is shown;

[0022] Figure 4 A schematic structural diagram of a knife bar from a second viewing angle provided in an embodiment of the application is shown;

[0023] Figure 5 A schematic structural diagram of a cutter head assembly provided in an embodiment of the application from a first perspective is shown;

[0024] Figure 6 A schematic structural diagram of a first blade holder provided in an embodiment of the application from a first viewing angle is shown;

[0025] Figure 7 A schematic structural diagram of a first knife seat provided in an embodiment of the application from a second viewing angle is shown;

[0026] Figure 8 A schematic structural diagram of a first tool holder provided in an embodiment of the application from a third viewing angle is shown;

[0027] Fig. 9 A schematic structural diagram of a centering drill bit provided in an embodiment of the application from a first perspective is shown;

[0028] Fig.10 A schematic structural diagram of a centering drill bit provided in an embodiment of the application from a second viewing angle is shown;

[0029] Fig.11 A schematic structural diagram of a centering drill bit provided in an embodiment of the application from a third viewing angle is shown;

[0030] Fig.12 A schematic structural diagram of a centering drill bit provided in an embodiment of the application from a fourth viewing angle is shown;

[0031] Fig.13 A schematic structural diagram of a countersinking assembly and a cutter bar provided in an embodiment of the application from a first perspective is shown;

[0032] Fig.14 A schematic structural diagram of a second knife holder provided in an embodiment of the application from a first viewing angle is shown;

[0033] Fig.15 A schematic structural diagram of a second blade holder provided in an embodiment of the application from a second viewing angle is shown;

[0034] Fig.16 A schematic flow chart of a method for processing a compressor stator casing connection hole provided in an embodiment of the application is shown.

[0035] in, Figures 1 to 15 The corresponding relationship between the reference numerals and the component names is as follows:

[0036] 100 stator housing, 110 connecting hole, 111 handle hole, 112 hole flat seat, 200 drilling and milling compound tool, 300 tool rod, 310 first connecting part, 320 second connecting part, 330 conical structure, 400 tool head assembly, 410 first tool seat, 411 first blade slot, 412 second blade slot, 420 centering drill, 421 positioning tip, 422 cutting edge, 423 chip removal edge, 500 countersinking assembly, 510 second tool seat, 511 third blade slot. DETAILED DESCRIPTION

[0037] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0038] Refer to the following Figures 1 to 16 The drilling and milling composite tool 200 and the processing method of the compressor stator casing connection hole provided in some embodiments of the present application are described. Among them, the processing method of the compressor stator casing connection hole is processed by using the drilling and milling composite tool 200. It can be understood that the drilling and milling composite tool 200 provided in the present application can also process the connection holes 110 of other components, such as Figure 1 and Figure 2As shown, the connecting hole 110 includes a handle hole 111 and an orifice flat seat 112, or the connecting hole 110 is a coaxial stepped connecting hole with different apertures. For ease of understanding, the following embodiments of the present application will be described using the drilling and milling composite tool 200 to process the connecting hole 110 of the compressor stator casing 100 as an example.

[0039] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Fig.13 As shown, an embodiment of the first aspect of the present application provides a drilling and milling composite tool 200, including: a tool rod 300, the tool rod 300 includes a first connecting portion 310 and a second connecting portion 320 arranged at a front and rear interval; a tool head assembly 400, the tool head assembly 400 includes a first tool seat 410 and a first blade, the first tool seat 410 is detachably connected to the first connecting portion 310, and the first blade is detachably connected to the first tool seat 410; a countersinking assembly 500, the countersinking assembly 500 includes a second tool seat 510 and a second blade, the second tool seat 510 is detachably connected to the second connecting portion 320, and the second blade is detachably connected to the second tool seat 510; wherein, the diameter of the first tool seat 410 is smaller than the diameter of the second tool seat 510.

[0040] The drilling and milling composite tool 200 provided in the embodiment of the present application includes a tool rod 300, a cutter head assembly 400 and a countersinking assembly 500. The cutter head assembly 400 is installed on the tool rod 300 via a first tool seat 410 and a first connecting portion 310 on the tool rod 300, and the countersinking assembly 500 is installed on the tool rod 300 via a second tool seat 510 and a second connecting portion 320 on the tool rod 300. Thus, the cutter head assembly 400 and the countersinking assembly 500 are installed on the tool rod 300 at intervals. In this way, the rotation of the tool rod 300 can drive the tool head assembly 400 and the countersinking assembly 500 to rotate, thereby, the first blade of the tool head assembly 400 can be used to process the handle hole 111 of the connecting hole 110, and the second blade of the countersinking assembly 500 can be used to process the hole mouth flat seat 112 of the connecting hole 110, so that the handle hole 111 and the hole mouth flat seat 112 of the connecting hole 110 can be processed by a drilling and milling composite tool 200. That is, after the tool rod 300 is connected to the processing equipment, the tool head assembly 400 on the tool rod 300 can be used to process the handle hole 111, and the countersinking assembly 500 on the tool rod 300 can be used to process the orifice flat seat 112. Since the first tool seat 410 and the first connecting part 310 are detachably connected, and the second tool seat 510 and the second connecting part 320 are detachably connected, before the rough processing process of the connecting hole 110, the tool head assembly 400 and the countersinking assembly 500 of appropriate sizes can be installed on the tool rod 300 to respectively perform rough processing on the handle hole 111 and the orifice flat seat 112. After completion, the tool head assembly 400 and the countersinking assembly 500 of appropriate sizes can be replaced, and the replaced tool head assembly 400 and the countersinking assembly 500 can be used to respectively perform fine processing on the handle hole 111 and the orifice flat seat 112.

[0041] Therefore, in the process of rough machining and finishing of the connection hole 110 using the drilling and milling compound tool 200 provided by the present application, it is not necessary to replace the processing equipment and the tool, and it is only necessary to replace the cutter head assembly 400 and the countersink assembly 500 on the tool bar 300. Compared with the rough machining and finishing process of the connection hole in the related art, which requires frequent replacement of processing equipment and tools, the steps of replacing processing equipment and tools are simplified. Since the tool bar 300 can always be connected to the processing equipment during the rough machining and finishing process of the present embodiment, the operation of re-aligning the tool after tool change is simplified, which is conducive to improving the position machining accuracy and dimensional accuracy of the engaging hole 111 and the hole flat seat 112, so that the machining accuracy can meet the geometric tolerance accuracy required by the drawing, reduce the rework rate of the casing, and improve the casing yield rate. At the same time, the tool travel and time are greatly reduced, the production efficiency is greatly improved, and it is suitable for popularization and application.

[0042] Among them, Figure 3 and Figure 4As shown, the first connection part 310 and the second connection part 320 are arranged on the tool bar 300 at intervals, which can ensure that the cutter head assembly 400 and the countersink assembly 500 installed on the tool bar 300 have a certain distance, so that the processing of the two will not interfere with each other, thereby ensuring good processing accuracy. Specifically, the first connection part 310 is located at the top of the tool bar 300.

[0043] Since the diameter of the engagement hole 111 of the connecting hole 110 is smaller than the diameter of the aperture flat seat 112, the diameter of the first tool seat 410 is set to be smaller than the diameter of the second tool seat 510, so that the engagement hole 111 can be processed by the first blade installed on the first tool seat 410, and the aperture flat seat 112 can be processed by the second blade installed on the second tool seat 510. At the same time, the first connecting portion 310 is located at the front end of the second connecting portion 320, and the two are arranged at intervals, so that it is convenient to process the engagement hole 111 with a smaller size by the cutter head assembly 400 installed on the first connecting portion 310. After the cutter head assembly 400 passes through the engagement hole 111, the countersinking assembly 500 installed on the rear second connecting portion 320 is used to process the aperture flat seat 112 with a larger size, so that the countersinking assembly 500 and the cutter head assembly 400 will not interfere with each other during operation.

[0044] In the above embodiment, if Figure 3 and Figure 4 As shown, the first connection part 310 and the second connection part 320 can be a threaded structure, that is, the first tool holder 410 and the first connection part 310 are connected by a threaded structure, and the second tool holder 510 and the second connection part 320 are connected by a threaded structure, which is convenient for disassembly and assembly, easy to process, and low in cost. Among them, the first blade can be installed on the first tool holder 410 by at least one of a bolt structure, a clamping structure, a mortise and tenon structure, and an adhesive, and the second blade can be installed on the second tool holder 510 by at least one of a bolt structure, a clamping structure, a mortise and tenon structure, and an adhesive. This arrangement is convenient for disassembling the first blade from the first tool holder 410 for maintenance or replacement, and for disassembling the second blade from the second tool holder 510 for maintenance or replacement, which is convenient for operation. Compared with the related art of directly repairing the worn twist drill bit on the tool holder, it will not affect the connection position of the tool rod 300 and the processing equipment, thereby helping to improve the position processing accuracy and dimensional accuracy of the handle hole 111 and the hole flat seat 112, reduce the housing rework rate, and improve the housing finished product rate.

[0045] It can be understood that the diameter of the first tool seat 410 in the rough machining process is smaller than the diameter of the first tool seat 410 in the fine machining process, so as to ensure that sufficient machining allowance is left for the fine machining of the joint hole 111 after rough machining; similarly, the diameter of the second tool seat 510 in the rough machining process is smaller than the diameter of the second tool seat 510 in the fine machining process, so as to ensure that sufficient machining allowance is left for the fine machining of the hole mouth flat seat 112 after rough machining.

[0046] like Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 As shown, in some possible embodiments provided by the present application, the cutter head assembly 400 further includes a centering drill bit 420, a mounting slot is provided at the top of the first tool holder 410, the rear end of the centering drill bit 420 is detachably connected to the first tool holder 410 through the mounting slot, and the top end of the centering drill bit 420 protrudes from the first tool holder 410. Therefore, when the cutter head assembly 400 is used to perform rough machining of the engagement hole 111, the centering drill bit 420 at the top center of the cutter head assembly 400 can be used to perform centering machining first, such as reducing the cutting area of ​​the centering drill under the parameters of high speed and low feed, thereby reducing the cutting force of the tool and the torque on the tool bar 300, so that the correctness of the machining position can be accurately and stably guaranteed to improve the centering position accuracy.

[0047] In the related art, when a twist drill is used to rough-process a handle hole, the processing parameters of the twist drill are limited by its material, structural strength, and other reasons, and are limited by its rated processing parameter requirements, resulting in low processing efficiency and failure to meet the conditions of large-size, high-speed processing. However, the centering drill 420 of the present application can work under high-speed, low-feed parameters, thereby reducing the cutting area of ​​the centering drill, thereby reducing the cutting force of the tool and the torque on the tool bar 300, thereby accurately and stably ensuring the correctness of the processing position, solving the problems of poor centering position, inaccurate tool centering, and deviation of hole position size when using a twist drill to rough-process a handle hole in the related art, which is conducive to improving the dimensional accuracy of the handle hole 111, thereby improving the position accuracy and processing accuracy of the connecting hole 110, and improving the yield rate of the stator housing 100.

[0048] The centering drill bit 420 is detachably connected to the mounting groove of the first tool holder 410, thereby facilitating the disassembly and assembly of the centering drill bit 420 and the first tool holder 410, and facilitating the disassembly and separation of the centering drill bit 420 and the first tool holder 410 for maintenance or replacement, which is conducive to improving maintenance efficiency and saving replacement costs. Specifically, a threaded structure is provided in the mounting groove, and the centering drill bit 420 is connected to the mounting groove through the threaded structure. The threaded structure is convenient for disassembly and assembly, easy to process, and has low cost.

[0049] like Fig. 9 , Fig.10 and Fig.11As shown, in the above embodiment, the top of the centering drill bit 420 is provided with a positioning tip 421, and the outer peripheral side of the positioning tip 421 is provided with a cutting edge 422 and a chip removal edge 423 located behind the cutting edge 422. By reasonably setting the structure of the centering drill bit 420, the centering drill bit 420 can quickly remove chips. Specifically, the cutting edge 422 of the centering drill bit 420 adopts a first angle as the opening angle size, and the cutting edge angle adopts a second angle to ensure that the iron chips are quickly removed. Among them, the first angle and Fig.10 The angle β in is complementary, and the first angle may be 110 to 130°, specifically, the first angle may be 120°, that is, Fig.12 The angle β in is 60°. The second angle can be Fig.12 As shown in the angle α in FIG. 1 , the angle α may be 135° to 140°, and specifically, the angle a may be 138°. The fixing form of the center drill bit 420 and the mounting groove of the first tool holder 410 adopts a left-handed thread form to prevent the tool bar 300 from loosening and falling off during right-handed processing.

[0050] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, in some possible embodiments provided in the present application, the first tool seat 410 is provided with a first chip groove along the circumferential side from the top end, and the side wall of the first chip groove is provided with a first blade groove 411, and the first blade groove 411 is located at the top end of the first tool seat 410 and is used to install the first blade, wherein the first blade grooves 411 are arranged in pairs with the axis of the first tool seat 410 as the center, and the paired first blade grooves 411 are staggered along the radial direction of the first tool seat 410; the first blade grooves 411 are one pair or multiple pairs, and the sizes of the multiple pairs of first blade grooves 411 are different.

[0051] When a twist drill is used for processing in the related art, the twist drill has poor adjustability and the operator needs to manually grind the drill after it is worn during processing, which causes excessive human error in the cutting edge and leads to out-of-tolerance processing dimensions.

[0052] To this end, in this embodiment, the first blade and the first tool holder 410 are set in a detachable manner, that is, the first blade as the main cutting edge is set in a replaceable form, so that after the first blade is worn, the first blade can be removed from the first tool holder 410 for maintenance or replacement, which is convenient for operation and helps to reduce the error of the cutting edge 422 and improve the accuracy of the processing size. At the same time, first blade slots 411 of various specifications can be set on the first tool holder 410, such as first blade slots 411 of different sizes and different installation angles, to meet the installation requirements of first blades of different sizes and different installation angles, thereby increasing the adjustability of the first blade.

[0053] The first blade grooves 411 are arranged in pairs with the axis of the first tool holder 410 as the center, that is, the first blade grooves 411 are arranged at intervals of 180°, and the paired first blade grooves 411 are staggered along the radial direction of the first tool holder 410, so that the position dimensions of the first blade grooves 411 are in a cross form. Therefore, when the cutter head assembly 400 is in a high-speed cutting process, it is possible to avoid the resonance phenomenon that causes the instability of the tool rod 300, thereby improving the stability of the tool rod 300, which is beneficial to improving the processing quality and processing accuracy.

[0054] The first blade in the first blade slot 411 can be understood as the main cutting blade of the cutter head assembly 400, which is mainly responsible for processing and removing excess material in the hole.

[0055] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, in some possible embodiments provided by the present application, the cutter head assembly 400 further includes a third blade, and the side wall of the first chip removal groove is provided with a second blade groove 412, and the second blade groove 412 is located on the peripheral side of the first tool holder 410 and is used to install the third blade. The provision of the third blade is conducive to improving the chip removal capacity and efficiency of the blade assembly, and at the same time, it plays a role in finishing the processed surface, which can reduce the residual iron chips on the processed surface, thereby reducing the problem of poor surface roughness of the hole caused by the grinding of iron chips on the processed surface, which is conducive to improving the roughness of the processed surface, improving the qualified rate of the processed surface quality, and thus improving the finished product rate.

[0056] Specifically, the side elevation of the third blade is designed as the main cutting edge, and the effective cutting depth is controlled to be ≤0.3mm. In this way, the cutting roughness can be controlled above Ra3.2, solving the problem of poor surface roughness of the relevant hole.

[0057] Furthermore, the third blade is connected to the first blade seat 410 via the second blade slot 412, so that the third blade can be removed from the first blade seat 410 for replacement or repair.

[0058] In the above embodiment, the second blade slots 412 are arranged in pairs with the axis of the first tool seat 410 as the center, and the two second blade slots 412 arranged in pairs are staggered in the axial direction of the first tool seat 410, thereby increasing the processing area of ​​the second blade, which is beneficial to improving the uniformity of the surface roughness of the handle hole 111 while ensuring that the surface of the handle hole 111 has a high roughness. At the same time, it is beneficial to reduce the resonance phenomenon, improve the stability of the tool rod 300, and improve the processing quality and processing accuracy.

[0059] like Fig.13 , Fig.14 and Fig.15As shown, in some possible embodiments provided in the present application, a plurality of second chip grooves are arranged at intervals along the circumferential side of the top end of the second tool seat 510, and a third blade groove 511 is arranged on the side wall of the second chip groove. The third blade groove 511 is located at the top end of the second tool seat 510 and is used to install the second blade; wherein, the plurality of second blade grooves 412 are arranged in an alternating manner along the radial direction of the second tool seat 510.

[0060] In this embodiment, the second tool holder 510 of the countersinking assembly 500 adopts a uniformly distributed multi-segment cutting form, each segment is designed with a third blade groove 511 to install the second blade, and the second blade of each segment is designed in a staggered form along the radial dimension of the second tool holder 510. In this way, the surface of the orifice flat seat 112 to be processed can be effectively divided into small areas in an evenly distributed manner for cutting. This greatly reduces the single cutting force of the second blade. The reduction in cutting force directly improves the dimensional accuracy and surface roughness of the orifice flat seat 112.

[0061] Furthermore, the second tool holder 510 and the second connecting portion 320 are fixed in a left-handed thread form to prevent the tool rod 300 from loosening and falling off during right-handed processing.

[0062] In the above embodiment, the coaxiality between the first tool holder 410 and the second tool holder 510 and the tool bar 300 is ≤ 0.005 mm, that is, the axial coaxiality between the first tool holder 410 of the cutter head assembly 400 and the second tool holder 510 of the countersinking assembly 500 and the tool bar 300 is 0 mm to 0.005 mm, such as the coaxiality between the first tool holder 410 and the second tool holder 510 and the tool bar 300 is 0 mm, 0.02 mm, 0.03 mm, 0.005 mm, or other sizes. In this way, the coaxiality between the handle hole 111 and the hole flat seat 112 can be improved, and the overall dimensional accuracy of the connecting hole 110 can be improved.

[0063] Specifically, during the machining process, the tool head assembly 400 is first used to cut the handle hole 111. After the handle hole 111 is machined, the tool head assembly 400 passes through the handle hole 111 and no longer performs cutting. Under the premise of ensuring the same position, the tool rod 300 continues to move in the axial direction to the position size of the orifice flat seat 112, and the drilling processing parameters are converted into the processing parameters of the countersinking assembly 500. The orifice flat seat 112 is machined using the countersinking assembly 500. This design integrates the original separate tool processing into an integrated processing, and completes the two processing of the handle hole 111 and the orifice flat seat 112 under the premise of the same axial position, thereby ensuring the geometric and positional tolerance dimensions between the handle hole 111 and the orifice flat seat 112, and can halve the original tool travel time, thereby greatly improving production efficiency.

[0064] In some embodiments provided in the present application, the first blade and / or the second blade and / or the third blade are provided with an aluminum titanium nitride coating. That is, any one, any two, or three of the first blade, the second blade, and the third blade may be provided with an aluminum titanium nitride coating. The aluminum titanium nitride coating, whose material components are mainly composed of TiN (titanium nitride) and AlN (aluminum nitride), wherein TiN has excellent wear resistance and chemical stability, and the chemical stability of AlN is equivalent to that of aluminum oxide. The coating has excellent corrosion resistance, high hardness and excellent heat resistance, and is suitable for processing materials such as cemented carbide, steel and castings. Compared with the related art that is conducive to the processing of connecting holes by twist drills, this setting can effectively avoid the problem of manual grinding and trimming of the cutting edge after the drill bit is damaged; the application of the aluminum titanium nitride coating greatly improves the heat resistance and wear resistance of the tool, and effectively solves the problem of reduced cutting force caused by overheating of the tool.

[0065] In some possible embodiments provided in the present application, the tool bar 300 is made of 42CrNiMo6 material, HB316-375, the mechanical properties can reach level 10.9, the dimensional accuracy is ≤0.005mm, the improvement of the tool body performance and accuracy level effectively increases the tool strength and stability, and the tool can select high speed, deep cutting, and high feed cutting parameters when cutting, which directly improves the processing efficiency. Among them, the tail of the tool bar 300 is designed as a tapered structure 330, such as a Morse taper, so that it can be effectively installed and used in combination with the spindle of the radial drilling machine.

[0066] like Fig.16 As shown, an embodiment of the second aspect of the present application provides a method for processing a connection hole of a compressor stator casing, which is processed by using the drilling and milling composite tool 200 in the embodiment of the first aspect, wherein the connection hole 110 includes a handle hole 111 and a hole flat seat 112, the hole flat seat 112 is located at one end of the handle hole 111, the diameter of the hole flat seat 112 is greater than the diameter of the handle hole 111, and the depth of the hole flat seat is less than the depth of the handle hole 111, and the method includes:

[0067] Step S1601: Connect the tool bar of the drilling and milling compound tool to the processing equipment, use the tool head assembly to process the handle hole, and use the countersinking assembly to process the hole mouth flat seat.

[0068] The method for processing the connection hole of the compressor stator casing provided in the embodiment of the present application is that after the tool rod 300 of the drilling and milling composite tool 200 is connected to the processing equipment, such as after the tool rod 300 is connected to the main shaft of the radial drilling machine, there is no need to replace the processing equipment, and the tool head assembly 400 can be used to process the engagement hole 111, and the countersinking assembly 500 can be used to process the opening flat seat 112, so that the drilling and milling composite tool 200 provided in the embodiment of the present application can be used on the same processing equipment to realize the engagement hole 111 of the connection hole 110 and the hole flat seat 112. 2, there is no need to replace the processing equipment and tools. Compared with the related art that the engaging hole and the orifice flat seat need different processing equipment and different tools to be processed respectively, the steps of replacing the processing equipment and tools are simplified, and then the operation of re-calibrating the tool after the tool change is simplified, which is beneficial to improving the position processing accuracy of the engaging hole 111 and the orifice flat seat 112, so that the processing accuracy can meet the form and position tolerance accuracy required by the drawing, reduce the rework rate of the casing, and improve the casing yield rate. At the same time, the tool travel stroke and time are reduced, which is beneficial to improving the processing efficiency.

[0069] In some possible embodiments provided in the present application, the handle hole is processed by using a tool head assembly of a drilling and milling composite tool, and the hole flat seat is processed by using a countersinking assembly, which specifically includes:

[0070] The handle hole is rough-machined using the cutter head assembly, and the hole flat seat is rough-machined using the countersinking assembly; the cutter head assembly and the countersinking assembly are replaced, and the handle hole is fine-machined using the replaced cutter head assembly, and the hole flat seat is fine-machined using the replaced countersinking assembly.

[0071] Since the processing technology of the connection hole 110 includes two operations, rough machining and fine machining, the present embodiment provides a specific operation that facilitates the drilling and milling compound tool 200 to process the connection hole 110. Specifically, the connection hole 110 is firstly rough-machined, such as using the cutter head assembly 400 to rough-machine the handle hole 111, and using the countersinking assembly 500 to rough-machine the hole mouth flat seat 112, and then, the cutter head assembly 400 and the countersinking assembly 500 are replaced, and the connection hole 110 is fine-machined, such as using the replaced cutter head assembly 400 to fine-machine the handle hole 111, and using the replaced countersinking assembly 500 to fine-machine the hole mouth flat seat 112, thereby achieving the rough machining and fine machining operations of the connection hole 110.

[0072] Specifically, during the rough machining process, the size of the single side <3mm can be processed according to the design drawing requirements, that is, the radius of the first tool holder 410 of the replaced cutter head assembly 400 is greater than the radius of the first tool holder 410 of the cutter head assembly 400 before the replacement, and the difference between the two ranges from 1mm to 3mm; the radius of the second tool holder 510 of the replaced countersinking assembly 500 is greater than the radius of the second tool holder 510 of the countersinking assembly 500 before the replacement, and the difference between the two ranges from 1mm to 3mm. In this way, it can be ensured that there is sufficient machining allowance after rough machining to ensure that the dimensional accuracy requirements can be met after fine machining.

[0073] In some possible embodiments provided in the present application, rough machining of the handle hole is performed using a cutter head assembly, and rough machining of the hole flat seat is performed using a countersinking assembly, specifically including:

[0074] The tool bar is controlled to rotate, and the centering drill of the tool head assembly positions the engagement hole at a first cutting speed and a first feed rate;

[0075] The tool bar is controlled to rotate, and the first blade of the tool head assembly performs rough machining on the handle hole at a second cutting speed and a second feed rate;

[0076] The tool bar is controlled to move axially to a suitable position, and the tool bar is controlled to rotate. The second blade of the countersinking assembly performs rough machining on the hole flat seat at a third cutting speed and a third feed rate.

[0077] This embodiment provides a specific operation for rough machining of the connecting hole 110. First, the tool rod 300 is controlled to rotate, and the centering drill 420 of the cutter head assembly 400 positions the engagement hole 111 at a first cutting speed and a first feed rate, so that the centering drill 420 works under the parameters of high speed and low feed, reducing the cutting area and thus reducing the cutting force of the tool and the torque on the tool rod 300, so as to accurately and stably ensure the correctness of the machining position. The tool rod 300 is controlled to rotate, and the first blade of the cutter head assembly 400 performs rough machining on the engagement hole 111 at a second cutting speed and a second feed rate, so as to use the first blade of the cutter head assembly 400 to perform rough machining on the engagement hole 111, wherein the first blade has a larger chip removal angle, which can improve the chip removal efficiency. It can be understood that a third blade is also provided on the first tool holder 410, and the provision of the third blade avoids the residue of iron chips and improves the surface roughness. After the rough machining of the engagement hole 111 is completed, at the same machining position, the tool bar 300 is controlled to move axially to a suitable position, the cutter head assembly 400 passes through the engagement hole 111, and the countersinking assembly 500 reaches the machining position of the aperture flat seat 112. At this time, the tool bar 300 is controlled to rotate so that the second blade of the countersinking assembly 500 performs rough machining on the aperture flat seat 112 at the third cutting speed and the third feed rate. Since the connection position of the tool bar 300 relative to the machining equipment has not changed, the tool setting operation after the tool change is simplified, which is conducive to improving the coaxiality and dimensional accuracy of the engagement hole 111 and the aperture flat seat 112, improving the machining accuracy of the connection hole 110, and at the same time, it is conducive to improving the machining efficiency.

[0078] Among them, the first cutting speed is 80rpm-100rpm, and the first feed rate is 60mm / min-80mm / min; the second cutting speed is 200rpm-300rpm, and the second feed rate is 10mm / min-30mm / min; the third cutting speed is 20rpm-40rpm, and the third feed rate is 25mm / min-30mm / min.

[0079] In some possible embodiments provided in the present application, the handle hole is finely processed by using the replaced cutter head assembly, and the hole flat seat is finely processed by using the replaced countersinking assembly, which specifically includes:

[0080] The tool bar is controlled to rotate, and the replaced first blade performs finish machining on the handle hole at a fourth cutting speed and a fourth feed rate;

[0081] The tool bar is controlled to move axially to a suitable position, and the tool bar is controlled to rotate. The replaced second blade is used to finish the hole flat seat at the fifth cutting speed and the fifth feed rate.

[0082] This embodiment provides a specific operation for finishing the connection hole 110. Specifically, the finishing operation is performed after the cutter head assembly 400 and the countersinking assembly 500 are replaced. First, the tool bar 300 is controlled to rotate, so that the replaced first blade can finish the engagement hole 111 at the fourth cutting speed and the fourth feed rate. After the finishing of the engagement hole 111 is completed, the tool bar 300 is controlled to move axially to a suitable position, such as making the replaced countersinking assembly 500 reach the processing position of the orifice flat seat 112, and the tool bar 300 is controlled to rotate so that the replaced second blade of the countersinking assembly 500 can finish the orifice flat seat 112 at the fifth cutting speed and the fifth feed rate, thereby achieving the finishing operation of the connection hole 110.

[0083] Among them, the fourth cutting speed is 300rpm-400rpm, and the fourth feed rate is 10mm / min-25mm / min; the fifth cutting speed is 30rpm-50rpm, and the fifth feed rate is 25mm / min-30mm / min.

[0084] In the processing process of the connecting hole 110 provided in the present embodiment, during the rough processing operation and the fine processing operation of the connecting hole 110, the tool rod 300 is always connected to the same processing equipment, and only the cutter head assembly 400 and the countersinking assembly 500 are replaced, and the tool rod 300 and the processing equipment are not disassembled, that is, the connection position of the tool rod 300 relative to the processing equipment is not changed, thereby simplifying the tool alignment operation after the tool change, which is beneficial to improve the coaxiality and position accuracy of the engaging hole 111 and the hole mouth flat seat 112, improve the processing accuracy of the connecting hole 110, improve the yield rate, and at the same time, help to improve the processing efficiency.

[0085] In some possible embodiments provided in the present application, there are multiple connecting holes, and the method further includes:

[0086] After rough machining the engagement holes and the flat seats of the hole openings of the individual connection holes one by one using a drilling and milling compound tool;

[0087] Replace the cutter head assembly and the countersinking assembly, and use the replaced cutter head assembly and the countersinking assembly to successively finish the engagement hole and the hole mouth flat seat of a single connecting hole.

[0088] The present embodiment provides a processing operation for a plurality of connection holes 110. Specifically, a single connection hole 110 is rough-machined using the cutter head assembly 400 and the countersinking assembly 500 of the drilling and milling compound cutter, and then, the cutter head assembly 400 and the countersinking assembly 500 are still used to perform rough machining on a plurality of connection holes 110 in sequence until all the connection holes 110 are rough-machined. Then, the cutter head assembly 400 and the countersinking assembly 500 are replaced, and a single connection hole 110 is fine-machined using the replaced cutter head assembly 400 and the countersinking assembly 500, and then, the plurality of connection holes 110 are fine-machined one by one in sequence using the replaced cutter head assembly 400 and the countersinking assembly 500 until all the connection holes 110 are fine-machined. It is understandable that, after all the connection holes 110 are rough-machined, the stator housing 100 can be subjected to a heat treatment operation, and after the heat treatment operation is completed, the fine machining operation of all the connection holes 110 is performed.

[0089] It is understandable that before rough machining the connection holes 110 , the center plane of the stator housing 100 may be milled to determine the reference plane and the positions of the plurality of connection holes 110 .

[0090] The specific process of machining the connection hole 110 of the compressor stator casing 100 using the drilling and milling composite tool 200 provided in the present application is as follows:

[0091] 1. Determination of the reference surface before drilling: Before drilling, the center dividing surface of the stator housing 100 needs to be milled to ensure a stable and accurate reference surface when the connecting hole 110 is processed, so as to ensure that the verticality relationship between the center of the connecting hole 110 and the horizontal plane after the connecting hole 110 is processed is controlled within 0.1mm or less for rough processing and 0.03mm or less for fine processing.

[0092] 2. Determination of hole positions: There are a large number of connection holes 110 on the stator housing 100. In order to prevent interference between the holes, the positions of the connection holes 110 are marked and laid out before processing. The marking requires rectangular equal margins. After measurement, the connection holes 110 are marked one by one.

[0093] 3. Rough machining of the connection hole 110 is performed by using a drilling and milling compound tool 200. During rough machining, the size of the single side is less than 3 mm as required by the design drawing. During machining, the centering drill 420 performs positioning machining on the engagement hole 111 at a first cutting speed and a first feed rate. The first blade of the cutter head assembly 400 performs rough machining on the engagement hole 111 at a second cutting speed and a second feed rate. The second blade of the countersinking assembly 500 performs rough machining on the hole flat seat 112 at a third cutting speed and a third feed rate. After completion, the tool is withdrawn and the work is stopped.

[0094] 4. Finishing the connection hole 110, first replace the cutter head assembly 400 and the countersink assembly 500, and then control the cutter bar 00 to rotate for finishing. The first blade of the replaced cutter head assembly 400 finishes the engagement hole 111 at the fourth cutting speed and the fourth feed rate, and the second blade of the countersink assembly 500 finishes the hole flat seat 112 at the fifth cutting speed and the fifth feed rate. It can be understood that the centering drill bit 420 can be removed from the first tool holder 410 during the finishing process, or it can continue to be connected to the first tool holder 410.

[0095] The drilling and milling compound tool 200 provided in the embodiment of the present application, and the method of using the drilling and milling compound tool 200 to process the connecting hole of the compressor stator casing, combine the advantages of the radial drilling machine and the CNC gantry milling processing method, and utilize the simple installation structure and convenient use of the radial drilling machine tool, as well as the high-speed cutting method of the CNC gantry milling machine, to greatly improve the processing accuracy and processing series of the connecting hole 110, reduce the rework rate of the casing, and improve the finished product rate of the casing, which is suitable for promotion and application.

[0096] In the description of this application, the term "plurality" refers to two or more than two. Unless otherwise clearly defined, the terms "upper" and "lower" indicate positions or positional relationships based on the positions or positional relationships described in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. The terms "connect", "install", "fixed", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0097] For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A drilling and milling compound tool, characterized in that: include: A knife bar, the knife bar comprising a first connecting portion and a second connecting portion spaced apart in front and back; A cutter head assembly, the cutter head assembly comprising a first cutter seat and a first blade, the first cutter seat is detachably connected to the first connecting portion, and the first blade is detachably connected to the first cutter seat; A countersinking assembly, the countersinking assembly comprising a second tool holder and a second blade, the second tool holder being detachably connected to the second connecting portion, and the second blade being detachably connected to the second tool holder; Wherein, the diameter of the first tool seat is smaller than the diameter of the second tool seat.

2. The drilling and milling compound tool according to claim 1, characterized in that: The cutter head assembly further comprises a centering drill bit, a mounting groove is provided at the top of the first cutter seat, a rear end of the centering drill bit is detachably connected to the first cutter seat through the mounting groove, and a top end of the centering drill bit protrudes from the first cutter seat; The top end of the center drill bit is provided with a positioning tip, the outer peripheral side of the positioning tip is provided with a cutting edge and a chip removal edge located behind the cutting edge.

3. The drilling and milling compound tool according to claim 2, characterized in that: The first tool seat is provided with a first chip removal groove along the circumference of the top end, and a first blade groove is provided on the side wall of the first chip removal groove. The first blade groove is located at the top end of the first tool seat and is used to install the first blade; Wherein, the first blade grooves are arranged in pairs with the axis of the first blade seat as the center, and the first blade grooves arranged in pairs are staggered along the radial direction of the first blade seat; The first blade slots are in one pair or in multiple pairs, and the sizes of the multiple pairs of first blade slots are different.

4. The drilling and milling compound tool according to claim 3, characterized in that: The cutter head assembly further includes a third blade, the side wall of the first chip removal groove is provided with a second blade groove, the second blade groove is located on the peripheral side of the first tool seat and is used to install the third blade; The second blade slots are arranged in pairs with the axis of the first blade seat as the center, and the two second blade slots arranged in pairs are staggered along the axial direction of the first blade seat.

5. The drilling and milling compound tool according to claim 1, characterized in that: A plurality of second chip removal grooves are arranged at intervals along the circumference of the top end of the second tool seat, and a third blade groove is arranged on the side wall of the second chip removal groove. The third blade groove is located at the top end of the second tool seat and is used to install the second blade; Wherein, a plurality of the second blade grooves are staggeredly arranged along the radial direction of the second blade seat.

6. A method for processing a compressor stator casing connection hole, characterized in that: Using the drilling and milling compound tool as claimed in any one of claims 1 to 5 for processing, the connecting hole includes a handle hole and a hole flat seat, and the method includes: The tool bar of the drilling and milling compound tool is connected to the processing equipment, the handle hole is processed by the tool head assembly, and the hole flat seat is processed by the countersinking assembly.

7. The method according to claim 6, characterized in that The method of processing the handle hole by using the tool head assembly of the drilling and milling compound tool and processing the hole flat seat by using the countersinking assembly specifically includes: After the handle hole is roughly processed by the cutter head assembly and the hole flat seat is roughly processed by the countersinking assembly; The cutter head assembly and the countersinking assembly are replaced, and the handle hole is finely processed using the replaced cutter head assembly, and the hole flat seat is finely processed using the replaced countersinking assembly.

8. The method according to claim 7, characterized in that The rough machining of the handle hole by using the cutter head assembly and the rough machining of the hole flat seat by using the countersinking assembly specifically include: Controlling the rotation of the tool bar, and causing the centering drill of the tool head assembly to perform positioning processing on the engagement hole at a first cutting speed and a first feed rate; Controlling the tool bar to rotate, so that the first blade of the tool head assembly performs rough machining on the engagement hole at a second cutting speed and a second feed rate; Control the tool bar to move axially to a suitable position, control the tool bar to rotate, and the second blade of the countersinking assembly performs rough machining on the aperture flat seat at a third cutting speed and a third feed rate; Wherein, the first cutting speed is 80rpm-100rpm, and the first feed rate is 60mm / min-80mm / min; The second cutting speed is 200 rpm-300 rpm, and the second feed rate is 10 mm / min-30 mm / min; The third cutting speed is 20rpm-40rpm, and the third feed rate is 25mm / min-30mm / min.

9. The method according to claim 7, characterized in that: The method of fine-machining the handle hole by using the replaced cutter head assembly and fine-machining the hole flat seat by using the replaced countersinking assembly specifically includes: Controlling the tool bar to rotate, so that the replaced first blade performs finish machining on the handle hole at a fourth cutting speed and a fourth feed rate; Control the tool bar to move axially to a suitable position, control the tool bar to rotate, and the replaced second blade performs finish machining on the aperture flat seat at a fifth cutting speed and a fifth feed rate; Wherein, the fourth cutting speed is 300rpm-400rpm, and the fourth feed rate is 10mm / min-25mm / min; The fifth cutting speed is 30rpm-50rpm, and the fifth feed rate is 25mm / min-30mm / min.

10. The method according to claim 7, characterized in that The number of the connecting holes is multiple, and the method further includes: After the engagement hole and the hole flat seat of each of the connecting holes are rough-machined one by one by using the drilling and milling compound tool; The cutter head assembly and the countersinking assembly are replaced, and the replaced cutter head assembly and the countersinking assembly are used to successively perform finish machining on the engagement hole and the hole mouth flat seat of the single connecting hole.

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