Drilling and milling composite tool and processing method of compressor stator casing connection hole

Abstract

The present application discloses a drilling and milling composite tool and a method for processing the connection hole of a compressor stator casing. The drilling and milling composite tool comprises: a tool bar, the tool bar comprising a first connection portion and a second connection portion spaced apart in a front-to-rear manner; a cutter head assembly, the tool head assembly comprising a first tool holder and a first blade, the first tool holder being detachably connected to the first connection portion, and the first blade being detachably connected to the first connection portion; 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 connection portion, and the second blade being detachably connected to the second connection portion; wherein the diameter of the first tool holder is smaller than the diameter of the second tool holder. Therefore, in the process of using the drilling and milling composite tool to perform rough machining and fine machining on the connection hole, it is not necessary to replace the machining equipment and tools, but only the tool head assembly and the countersinking assembly on the tool bar need to be replaced, which simplifies the tool setting operation, can improve the position machining accuracy of the coupling hole and the hole flat seat, and improve the casing yield and production efficiency.

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 connecting hole of a compressor stator casing. Background Art

[0002] Currently, large centrifugal compressors are widely used in various fields. Among the stator components of centrifugal compressor units, the stator casing is a large, critical machined part, typically weighing between 5 and 100 tons and possessing a relatively large size. Typically, the stator casing consists of an upper and lower component. The center flange of the upper casing is designed with connection holes to facilitate connection to the lower casing. These holes include holes for the bolts and a flat seat for the orifice.

[0003] Currently, the processing technology for this connecting hole includes rough machining and fine machining. During rough machining, a radial drilling machine is used with a twist drill bit installed to rough-machine the handle hole. After completion, a countersinking bar and a stainless steel blade are installed. After the tool is aligned, countersinking is performed to rough-machine the hole seat. During fine machining, a CNC gantry milling machine is used to install a U-drill and machine the inner hole at high speed to fine-machine the handle hole. Then, a radial drilling machine is used with a countersinking bar and a stainless 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 handle hole and the hole seat is poor, resulting in a high rework rate for the stator casing. Summary of the Invention

[0004] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. This section of the application does not intend to limit the key features and essential technical features of the claimed technical solution, nor does it intend 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 composite tool, comprising: a tool arbor, the tool arbor 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 end of the centering drill bit, and a cutting edge and a chip removal edge located behind the cutting edge are provided on the outer peripheral side of the positioning tip.

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

[0010] An embodiment of a second aspect of the present application provides a method for machining a connection hole of a compressor stator casing, wherein the connection hole comprises a handle hole and a flat seat at the hole opening, and the method comprises:

[0011] Connect the tool bar of the drilling and milling compound tool to the processing equipment, use the cutter head assembly to process the handle hole, and use the countersinking assembly to process the hole flat seat.

[0012] Furthermore, the cutter head assembly of the drilling and milling composite tool is used to process the handlebar hole, and the countersinking assembly is used to process the hole mouth flat seat, specifically including: 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] Furthermore, after rough-machining the handle hole by using the cutter head assembly and rough-machining the hole mouth flat seat by using the countersinking assembly, it specifically includes: controlling the rotation of the tool rod, and the centering drill bit of the tool head assembly positions the handle hole at a first cutting speed and a first feed rate; controlling the rotation of the tool rod, and the first blade of the tool head assembly rough-machining the handle hole at a second cutting speed and a second feed rate; controlling the tool rod to move axially to a suitable position, and controlling the rotation of the tool rod, and the second blade of the countersinking assembly rough-machining 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, if there are multiple connecting holes, the method also includes: using a drilling and milling composite tool to perform rough processing on the handle hole and the hole mouth flat seat of a single connecting hole one by one; replacing the cutter head assembly and the countersinking assembly, and using the replaced cutter head assembly and the countersinking assembly to perform fine processing on the handle hole and the hole mouth flat seat of the single connecting hole one by one.

[0016] The drilling and milling composite tool and the processing method of the compressor stator casing connection hole provided in 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 in the present application. Instead, it is only necessary to replace the cutter head assembly and the countersinking assembly on the tool bar. 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, thereby simplifying the operation of re-calibrating the tool after tool change, which is beneficial 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 form and position tolerance accuracy required by the drawing, reduce the casing rework rate, and improve the casing finished product rate. At the same time, the tool travel and time are greatly reduced, greatly improving production efficiency.

[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 skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. Throughout the drawings, the same reference numerals are used to denote the same components.

[0019] Figure 1 A partial structural schematic diagram of a housing and a drilling and milling compound tool provided in an embodiment of the present application after assembly from one perspective is shown;

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

[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 provided in an embodiment of the application from a second perspective is shown;

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

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

[0025] Figure 7 A schematic structural diagram of a first tool holder provided in an embodiment of the application from a second perspective is shown;

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

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

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

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

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

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

[0032] Figure 14 A schematic structural diagram of a second tool holder provided in an embodiment of the application from a first perspective is shown;

[0033] Figure 15 A schematic structural diagram of a second blade holder provided in an embodiment of the application from a second perspective is shown;

[0034] Figure 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 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 holder, 310 first connecting part, 320 second connecting part, 330 tapered structure, 400 tool head assembly, 410 first tool holder, 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 holder, 511 third blade slot. DETAILED DESCRIPTION

[0037] In order to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0038] Refer to the following Figures 1 to 16 The following describes 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. Among them, the processing method of the compressor stator casing connection hole is to use the drilling and milling composite tool 200 for processing. It is understandable 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 a hole 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 are explained 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 、 Figure 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 spaced apart in a front and rear direction; 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 an 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 through 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 through 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 cutter head assembly 400 and the countersinking assembly 500 to rotate, thereby, the first blade of the cutter 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 both be processed by using 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 size 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 size are replaced, and the replaced tool head assembly 400 and the countersinking assembly 500 are 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 fine machining of the connecting hole 110 using the drilling and milling composite tool 200 provided by the present application, there is no need to replace the processing equipment and the tool. It is only necessary to replace the cutter head assembly 400 and the countersinking assembly 500 on the tool bar 300. Compared with the rough machining and fine machining process of the connecting 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 fine machining process of this embodiment, the operation of re-calibrating the tool after the 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 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 and time are greatly reduced, the production efficiency is greatly improved, and it is suitable for popularization and application.

[0042] Among them, such as Figure 3 and Figure 4As shown, the first connecting portion 310 and the second connecting portion 320 are spaced apart on the tool bar 300 to ensure that the cutter head assembly 400 and the countersink assembly 500 mounted on the tool bar 300 are spaced apart from each other so that the machining processes of the two do not interfere with each other, thereby ensuring good machining accuracy. Specifically, the first connecting portion 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 using the first blade installed on the first tool seat 410, and the aperture flat seat 112 can be processed using 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 a distance to facilitate the processing of the smaller engagement hole 111 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 larger aperture flat seat 112 can be processed using the countersinking assembly 500 installed on the rear second connecting portion 320, so that the countersinking assembly 500 and the cutter head assembly 400 do not interfere with each other during operation.

[0044] In the above embodiment, if Figure 3 and Figure 4 As shown, the first connecting portion 310 and the second connecting portion 320 can be threaded structures, that is, the first tool holder 410 and the first connecting portion 310 are connected by a threaded structure, and the second tool holder 510 and the second connecting portion 320 are connected by a threaded structure. This facilitates assembly and disassembly, is easy to process, and is relatively low in cost. The first blade can be mounted on the first tool holder 410 using at least one of a bolt structure, a clamping structure, a mortise and tenon structure, or an adhesive, and the second blade can be mounted on the second tool holder 510 using at least one of a bolt structure, a clamping structure, a mortise and tenon structure, or an adhesive. This arrangement facilitates removal of the first blade from the first tool holder 410 for repair or replacement, and also facilitates removal of the second blade from the second tool holder 510 for repair or replacement. Compared to the related art method of repairing a worn twist drill bit directly on the tool holder, this arrangement does not affect the connection position between the tool arbor 300 and the processing equipment. This improves the machining accuracy and dimensional accuracy of the handle hole 111 and the orifice flat seat 112, reduces the rework rate of the housing, and improves the yield rate of the housing.

[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 handle 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 flat seat 112 after rough machining.

[0046] like Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 As shown, in some possible embodiments provided in 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 via the mounting slot, and the top end of the centering drill bit 420 protrudes from the first tool holder 410. Thus, when the cutter head assembly 400 is used to perform rough machining of the handle 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. For example, under high speed and low feed parameters, the cutting area of ​​the centering drill can be reduced, thereby reducing the cutting force of the tool and the torque applied to the tool bar 300. This can ensure the correctness of the machining position accurately and stably, thereby improving the centering position accuracy.

[0047] In the related art, when using a twist drill to rough-machine a handle hole, the processing parameters of the twist drill are limited by its material, structural strength, and other factors, as well as its rated processing parameter requirements, resulting in low processing efficiency and inability to meet the conditions for large-size, high-speed processing. However, the centering drill 420 of the present application can operate 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 applied to the tool shank 300, thereby accurately and stably ensuring the correctness of the processing position. This solves the problems of poor centering position accuracy, inaccurate tool centering, and resulting deviation in hole position size when using a twist drill to rough-machine a handle hole in the related art, and 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 pilot drill bit 420 is detachably connected to the mounting slot of the first tool holder 410, thereby facilitating assembly and disassembly of the pilot drill bit 420 from the first tool holder 410. This facilitates detachment of the pilot drill bit 420 from the first tool holder 410 for repair or replacement, thereby improving repair efficiency and saving replacement costs. Specifically, a threaded structure is provided within the mounting slot, through which the pilot drill bit 420 is connected to the mounting slot. This threaded structure facilitates assembly and disassembly, is easy to process, and is relatively inexpensive.

[0049] like Figure 9 、 Figure 10 and Figure 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 rationally 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 Figure 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, Figure 12 The angle β in is 60°. The second angle can be Figure 12 As shown in the angle α in FIG, the angle α can be 135° to 140°, specifically, the angle a can be 138°. The center drill bit 420 is fixed to the mounting groove of the first tool holder 410 using a left-hand thread to prevent the tool shank 300 from loosening or falling off during right-hand machining.

[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 removal groove along the circumferential side from the top, and the side wall of the first chip removal groove is provided with a first blade groove 411, and the first blade groove 411 is located at the top 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 twist drills are used for processing in related technologies, the twist drills have poor adjustability and require the operator to manually grind the drills after wear during processing, resulting in excessive human error in the cutting edge and excessive processing size.

[0052] To this end, this embodiment configures the first blade and the first tool holder 410 to be removable, meaning that the first blade, which serves as the primary cutting edge, is replaceable. Consequently, after the first blade wears out, it can be removed from the first tool holder 410 for repair or replacement, which facilitates operation and helps reduce errors in the cutting edge 422 and improve the accuracy of the machining dimensions. Furthermore, the first tool holder 410 can be provided with first blade slots 411 of various specifications, such as first blade slots 411 of varying sizes and mounting angles, to accommodate the installation requirements of first blades of varying sizes and mounting angles, thereby increasing the adjustability of the first blade.

[0053] The first blade slots 411 are arranged in pairs with the axis of the first tool holder 410 as the center, that is, the first blade slots 411 are arranged at intervals of 180°, and the paired first blade slots 411 are staggered along the radial direction of the first tool holder 410, so that the position dimensions of the first blade slots 411 are in a cross form. Therefore, when the cutter head assembly 400 is in a high-speed cutting process, it can avoid the resonance phenomenon that causes 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 sidewall of the first chip removal groove is provided with a second blade groove 412. The second blade groove 412 is located on the peripheral side of the first tool holder 410 and is used to mount the third blade. The provision of the third blade is conducive to improving the chip removal capacity and efficiency of the blade assembly. At the same time, it plays the role of finishing the machined surface, which can reduce the residual iron chips on the machined surface. Therefore, the problem of poor surface roughness of the hole caused by the grinding of the iron chips on the machined surface is reduced, which is conducive to improving the roughness of the machined surface, improving the qualified rate of the machined surface quality, and thus improving the yield rate of the product.

[0056] Specifically, the side elevation of the third blade is designed as the main cutting edge, and the effective cutting depth is controlled at ≤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. Therefore, the processing area of ​​the second blade can be increased. While ensuring that the surface of the handle hole 111 has a high roughness, it is beneficial to improve the uniformity of the surface roughness of the handle hole 111. 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 Figure 13 、 Figure 14 and Figure 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 provided 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 staggered 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, and each segment is designed with a third blade groove 511 to install the second blade. 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 and second tool seats 410, 510 and the tool shank 300 is ≤ 0.005 mm. That is, the axial coaxiality between the first tool seat 410 of the cutter head assembly 400 and the second tool seat 510 of the countersinking assembly 500 and the tool shank 300 is 0 mm to 0.005 mm. For example, the coaxiality between the first and second tool seats 410, 510 and the tool shank 300 can be 0 mm, 0.02 mm, 0.03 mm, 0.005 mm, or other sizes. This improves the coaxiality between the handle hole 111 and the aperture flat seat 112, thereby improving the overall dimensional accuracy of the connecting hole 110.

[0063] Specifically, during the processing, the cutter head assembly 400 is first used to cut the handle hole 111. After the handle hole 111 is processed, the cutter head assembly 400 passes through the handle hole 111 and no further cutting is performed. 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 hole mouth flat seat 112, and the drilling processing parameters are converted into the processing parameters of the countersinking assembly 500. The hole mouth flat seat 112 is processed by 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 hole mouth flat seat 112 under the premise of the same axial position, ensuring the form and position tolerance size between the handle hole 111 and the hole mouth flat seat 112, and can reduce the original tool travel time by half, 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 can be provided with an aluminum titanium nitride coating. The aluminum titanium nitride coating is 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 beneficial for processing connecting holes with 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 herein, the toolholder 300 is made of 42CrNiMo6 material, HB316-375, achieving mechanical properties up to level 10.9 and dimensional accuracy ≤ 0.005mm. This improved toolholder performance and precision effectively enhances tool strength and stability, enabling the selection of high-speed, deep-cut, and high-feed cutting parameters, directly improving machining efficiency. The tail of the toolholder 300 is designed with a tapered structure 330, such as a Morse taper, to facilitate efficient assembly with a radial drilling machine spindle.

[0066] like Figure 16 As shown, 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 200 of the embodiment of the first aspect, wherein the connection hole 110 includes a handle hole 111 and a hole opening flat seat 112, the hole opening flat seat 112 is located at one end of the handle hole 111, the diameter of the hole opening flat seat 112 is larger than the diameter of the handle hole 111, and the depth of the hole opening flat seat is smaller than the depth of the handle hole 111, and the method includes:

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

[0068] The embodiment of the present application provides a method for processing the connection hole of the compressor stator casing. 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 spindle of the radial drilling machine, there is no need to change the processing equipment. The cutter head assembly 400 can be used to process the handle hole 111, and the countersinking assembly 500 can be used to process the opening flat seat 112. By using the drilling and milling composite tool 200 provided in the embodiment of the present application, the handle hole 111 of the connection hole 110 and the hole flat seat 112 can be processed on the same processing equipment. 2, does not require replacement of processing equipment and tools, and compared with the related art in which the engaging hole and the orifice flat seat need different processing equipment and different tools to be processed respectively, the steps of replacing processing equipment and tools are simplified, thereby simplifying the operation of re-tooling after tool change, 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 finished product 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 this application, the handle hole is machined using a drill head assembly of a drilling and milling composite tool, and the hole flat seat is machined using a countersinking assembly, specifically including:

[0070] Use the cutter head assembly to perform rough machining on the handle hole, and use the countersinking assembly to perform rough machining on the hole mouth flat seat; replace the cutter head assembly and the countersinking assembly, use the replaced cutter head assembly to perform fine machining on the handle hole, and use the replaced countersinking assembly to perform fine machining on the hole mouth flat seat.

[0071] Since the processing of the connection hole 110 includes two operations, rough machining and fine machining, this embodiment provides specific operations that facilitate the drilling and milling compound tool 200 to process the connection hole 110. Specifically, the connection hole 110 is first 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. 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. In this way, the rough machining and fine machining operations of the connection hole 110 are achieved.

[0072] Specifically, during the rough machining process, the dimensions can be machined according to the design drawing requirements of a single-side dimension of less than 3mm. That is, the radius of the first tool seat 410 of the replaced cutter head assembly 400 is larger than the radius of the first tool seat 410 of the cutter head assembly 400 before the replacement, with the difference between the two ranging from 1mm to 3mm; the radius of the second tool seat 510 of the replaced countersinking assembly 500 is larger than the radius of the second tool seat 510 of the replaced countersinking assembly 500 before the replacement, with the difference between the two ranging from 1mm to 3mm. This ensures that there is sufficient machining allowance after rough machining, ensuring that the dimensional accuracy requirements can be met after fine machining.

[0073] In some possible embodiments provided in this 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 rod is controlled to rotate, and the center drill bit of the tool head assembly positions the handle hole at a first cutting speed and a first feed rate;

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

[0076] The tool rod is controlled to move axially to a suitable position, and the tool rod 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 specific operations for rough machining of the connecting hole 110. First, the tool rod 300 is controlled to rotate, and the centering drill bit 420 of the cutter head assembly 400 positions the handle hole 111 at a first cutting speed and a first feed rate, so that the centering drill bit 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 applied to 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 rough-machines the handle 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 rough-machine the handle 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, causing the second blade of the countersinking assembly 500 to rough-machine the aperture flat seat 112 at the third cutting speed and third feed rate. Since the connection position of the tool bar 300 relative to the machining equipment does not change, the tool setting operation after the tool change is simplified, which is beneficial 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, helping to improve 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 this application, the replaced cutter head assembly is used to fine-machine the handle hole, and the replaced countersinking assembly is used to fine-machine the hole flat seat, specifically including:

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

[0081] The tool rod is controlled to move axially to a suitable position, and the tool rod 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 the fine machining of the connecting hole 110. Specifically, the fine machining operation is performed after the cutter head assembly 400 and the countersinking assembly 500 are replaced. First, the tool rod 300 is controlled to rotate, so that the first blade after replacement can fine-machine the engagement hole 111 at the fourth cutting speed and the fourth feed rate. After the fine machining of the engagement hole 111 is completed, the tool rod 300 is controlled to move axially to a suitable position, such as so that the replaced countersinking assembly 500 reaches the machining position of the orifice flat seat 112. The tool rod 300 is controlled to rotate so that the second blade of the replaced countersinking assembly 500 can fine-machine the orifice flat seat 112 at the fifth cutting speed and the fifth feed rate, thereby achieving the fine machining operation of the connecting 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 this 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, 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 improving the coaxiality and position accuracy of the engaging hole 111 and the hole mouth flat seat 112, improving the processing accuracy of the connecting hole 110, improving the yield rate, and at the same time, helping to improve the processing efficiency.

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

[0086] After rough machining the handle hole and hole flat seat of a single connecting hole 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] This embodiment provides a processing operation for multiple connection holes 110. Specifically, a single connection hole 110 is rough-machined using the drill head assembly 400 and the countersink assembly 500 of the drilling and milling composite tool. Then, the drill head assembly 400 and the countersink assembly 500 are still used to perform rough machining on multiple connection holes 110 in sequence until all connection holes 110 are rough-machined. Then, the drill head assembly 400 and the countersink assembly 500 are replaced, and the replaced drill head assembly 400 and the countersink assembly 500 are used to perform fine machining on a single connection hole 110. Then, the replaced drill head assembly 400 and the countersink assembly 500 are still used to perform fine machining on multiple connection holes 110 one by one until all connection holes 110 are fine-machined. It is understood that after all connection holes 110 are rough-machined, the stator housing 100 can be subjected to a heat treatment operation. After the heat treatment operation is completed, the fine machining operation of all connection holes 110 can be 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 a reference plane and 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 this 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 machining the connecting hole 110. This ensures that the perpendicularity between the center of the connecting hole 110 and the horizontal plane after machining is controlled within 0.1 mm or less for rough machining and 0.03 mm or less for fine machining.

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

[0093] 3. Rough machining of the connecting hole 110 is performed using the drilling and milling compound tool 200. During rough machining, the dimensions of one side are <3 mm as required by the design drawings. During machining, the center drill bit 420 locates the engagement hole 111 at a first cutting speed and a first feed rate. The first blade of the cutter head assembly 400 rough-machines the engagement hole 111 at a second cutting speed and a second feed rate. The second blade of the countersinking assembly 500 rough-machines the hole flat seat 112 at a third cutting speed and a third feed rate. After completion, the tool is withdrawn and the operation is stopped.

[0094] 4. Finishing the connection hole 110: First, replace the cutter head assembly 400 and the countersink assembly 500. Then, control the tool 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. The second blade of the countersink assembly 500 finishes the aperture flat seat 112 at the fifth cutting speed and the fifth feed rate. It will be appreciated that the center drill bit 420 can be removed from the first tool holder 410 during the finishing process, or it can remain attached to the first tool holder 410.

[0095] The drilling and milling composite tool 200 provided in the embodiment of the present application, and the method of using the drilling and milling composite tool 200 to process the connection 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, to greatly improve the processing accuracy and processing series of the connection 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, unless otherwise expressly defined. The orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship described in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation 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, various modifications and variations of this application are possible. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A method for processing a compressor stator casing connection hole, characterized in that: The machining is performed using a drilling and milling compound tool, the drilling and milling compound tool comprising: A knife bar, the knife bar including 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 being detachably connected to the first connecting portion, and the first blade being 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; The connecting hole includes a handle hole and a hole flat seat, and the method includes: Connecting the tool bar of the drilling and milling compound tool to the processing equipment, using the tool head assembly to process the handle hole, and using the countersinking assembly to process the hole flat seat; The method of machining the handle hole by using the tool head assembly of the drilling and milling composite tool and machining the hole flat seat by using the countersinking assembly specifically includes: After rough machining the handle hole using the cutter head assembly and rough machining the hole flat seat using the countersinking assembly; Replace the cutter head assembly and the countersinking assembly, use the replaced cutter head assembly to fine-machine the handle hole, and use the replaced countersinking assembly to fine-machine the hole flat seat.

2. The method for processing the compressor stator casing connection hole according to claim 1, characterized in that: The cutter head assembly further includes a centering drill bit, the top end of the first tool holder is provided with a mounting slot, the rear end of the centering drill bit is detachably connected to the first tool holder through the mounting slot, and the top end of the centering drill bit protrudes from the first tool holder; The top end of the center drill bit is provided with a positioning tip, and 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 method for processing the compressor stator casing connection hole 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; The first blade slots are arranged in pairs with the axis of the first blade seat as the center, and the first blade slots arranged in pairs are staggered along the radial direction of the first blade seat; The first blade slots are in one pair or multiple pairs, and the sizes of the multiple pairs of first blade slots are different.

4. The method for processing the compressor stator casing connection hole according to claim 3, characterized in that: The cutter head assembly further includes a third blade, and a second blade groove is provided on the side wall of the first chip removal 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 method for processing the compressor stator casing connection hole according to claim 1, characterized in that: A plurality of second chip removal grooves are provided at intervals along the circumference of the top end of the second tool seat, and a third blade groove is provided 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, the plurality of third blade slots are staggeredly arranged along the radial direction of the second blade seat.

6. The method according to claim 1, 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 rod, and positioning the center drill of the tool head assembly on the handle hole at a first cutting speed and a first feed rate; Controlling the tool rod to rotate, 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; Controlling the tool bar to move axially to a suitable position, controlling the tool bar to rotate, and causing the second blade of the countersinking assembly to perform rough machining on the aperture flat seat at a third cutting speed and a third feed rate; Wherein, the first cutting speed is 80 rpm-100 rpm, and the first feed rate is 60 mm / min-80 mm / 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 20 rpm-40 rpm, and the third feed rate is 25 mm / min-30 mm / min.

7. The method according to claim 1, characterized in that The method of using the replaced cutter head assembly to fine-process the handle hole and using the replaced countersinking assembly to fine-process the hole flat seat specifically includes: Controlling the rotation of the tool bar, and causing the replaced first blade to finish-process the handle hole at a fourth cutting speed and a fourth feed rate; Controlling the tool bar to move axially to a suitable position, controlling the tool bar to rotate, and performing finish machining on the aperture flat seat by the replaced second blade at a fifth cutting speed and a fifth feed rate; Wherein, the fourth cutting speed is 300 rpm-400 rpm, and the fourth feed rate is 10 mm / min-25 mm / min; The fifth cutting speed is 30 rpm-50 rpm, and the fifth feed rate is 25 mm / min-30 mm / min.

8. The method according to claim 1, characterized in that There are multiple connecting holes, and the method further includes: After using the drilling and milling composite tool to perform rough machining on the engagement hole and the hole flat seat of each connecting hole one by one; 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 fine processing on the engaging hole and the hole mouth flat seat of the single connecting hole.

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