A multi-material combination deep hole machining method, positioning block, tool and part

Abstract

The present application relates to the technical field of machining, especially to a multi-material combined deep hole machining method, a positioning block, a tool and a part. Rough machining is performed on the bottom hole in a single piece state to reduce the difficulty of direct machining after multi-material combination, improve machining efficiency and ensure the accuracy of the hole diameter. The bottom holes of the rough machined assembly parts are aligned and positioned, and a reaming cutter is used to machine the deep hole to be machined to obtain a reamed hole. The axial deviation of the hole can be corrected to provide an accurate reference for subsequent machining. A reamer is used to machine the reamed hole, and a reaming cutter with a rear guide form is used for machining. This process effectively suppresses the deflection and vibration during machining, ensuring the quality of the machined hole. A front guide type reamer is used to machine the pre-machined deep hole to expand the hole diameter of the pre-machined deep hole to the target hole diameter, completing the multi-material combined deep hole machining. The present application solves the problems of poor machining accuracy and low efficiency in the existing multi-material combined deep hole machining.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical processing, in particular to a multi-material combined deep hole processing method, positioning block, tool and part. BACKGROUND

[0002] Deep hole processing refers to the processing of holes with a length-to-diameter ratio greater than a certain value (usually 5 to 10, and in most cases L / d≥100). Its characteristics include small diameter and long length, poor rigidity, low strength, and easy vibration, waviness, tapering during cutting, which can affect the straightness and surface roughness of deep holes. Deep hole processing is widely used in many industries, such as the automotive industry, military aviation, hydraulic, coal machinery, mining machinery industry, mold industry, and petroleum and mining machinery industry. Many key parts in these industries require deep hole processing to meet their specific functional and performance requirements. There are many methods for deep hole processing, such as long drill deep hole processing, tool rotation cutting deep hole processing, rod material straight insertion deep hole processing, feed rolling deep hole processing, and through cutting deep hole processing, as well as other processing methods such as surface spraying deep hole processing, rectangular tool deep hole processing, extrusion deep hole processing, and freezing deep hole processing, which are suitable for specific types of workpieces and processing requirements. Long drill deep hole processing uses a long drill rod with a hard alloy blade; tool rotation cutting deep hole processing uses a reamer or lathe to process, gradually removing material from the middle of the workpiece by rotation to form a deep hole; rod material straight insertion deep hole processing is a processing method that gradually removes material from the middle of the workpiece by rotating the workpiece and tool; feed rolling deep hole processing gradually rolls the tool into the workpiece, forming a deep hole by rotation and feed, with higher cutting speed and less cutting force; through cutting deep hole processing is processed by rotation and feed, with higher cutting speed and less cutting force; but regardless of which processing method, due to the small diameter and long length of the tool in deep hole processing, it is easy to produce deflection and vibration during processing, resulting in poor processing accuracy.

[0003] Chinese invention with publication number CN118417594A discloses a deep hole processing method, relating to the technical field of deep hole processing. The method involves splitting the workpiece to be processed into several segments along the depth of the deep hole to be processed, then processing the workpiece segments, and finally assembling the processed workpiece segments to form the complete part. Although this deep hole processing method simplifies the deep hole processing into segment-by-segment processing of the workpiece segments through segmentation and assembly techniques, it can effectively avoid deflection and vibration caused by long processing paths, but for workpieces with high processing accuracy and many part assemblies, this method is time-consuming, inefficient and costly.

[0004] For example, in the aerospace engine field, a rotor part uses 24 precision bolts to connect nine components, with tight clearances. The design requires that the connection holes of all but the last-level component be machined using a combination process. The combined process hole is deep, reaching 94mm, with a diameter of Φ9.2 and an aspect ratio greater than 10. The hole passes through eight parts and has a laminated structure. Each part is made of different materials, including FGH4097, GH4698, and TC25, all of which are difficult to machine. The hole diameter requires strict tolerances, making deep hole machining in one go difficult. The tool is slender and has poor rigidity, making it prone to deflection and vibration during operation. Machining each part individually to the required deep hole accuracy is time-consuming and inefficient, and post-machining assembly is prone to assembly errors, still failing to meet the required part accuracy. Summary of the Invention

[0005] In view of the problems of poor processing precision and low efficiency in deep hole processing of multiple material combinations in the prior art, the present invention provides a deep hole processing method, a positioning block and parts of multiple material combinations.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A multi-material combined deep hole processing method, comprising:

[0008] Perform bottom hole roughing on each assembled part in a single-piece state; the bottom hole diameter after roughing is smaller than the target hole diameter;

[0009] Align and position the bottom holes of each assembly part after rough machining to form the deep hole to be machined;

[0010] The deep hole to be processed is processed to obtain an expanded hole; the expanded hole diameter is larger than the diameter of the deep hole to be processed and smaller than the target hole diameter; the expanded hole depth is smaller than the target hole depth;

[0011] Processing the expanded hole to obtain a guide hole; the guide hole diameter is larger than the expanded hole diameter and smaller than the target hole diameter; the guide hole diameter is smaller than the target hole depth;

[0012] Processing the guide hole to obtain a pre-processed deep hole; wherein the depth of the pre-processed deep hole is equal to the target hole depth;

[0013] The pre-processed deep hole is processed to expand the diameter of the pre-processed deep hole to the target diameter, completing the deep hole processing of multiple material combinations.

[0014] Optionally, the bottom hole after rough machining satisfies: D1=D-(0.5-0.9 mm), wherein D is the target hole diameter and D1 is the bottom hole diameter after rough machining.

[0015] Optionally, the bottom hole after rough machining satisfies: D1=D-0.7mm.

[0016] Optionally, the reaming satisfies: D2=D-(0.2-0.4mm), L1=L / 4-L / 2, wherein D2 is the reaming hole diameter, L is the target hole depth, and L1 is the reaming depth.

[0017] Optionally, the reaming satisfies: D2=D-0.3mm, L1=L / 3.

[0018] Optionally, all the tools used in the machining process adopt the down chip structure.

[0019] A positioning block for the deep hole machining method of the combined materials is provided, and the positioning block comprises positioning segments and positioning pins, each positioning segment is provided with a positioning hole, and the position of the positioning hole corresponds to a deep hole to be machined; during the deep hole machining, the positioning pins extend into the corresponding positioning holes through the deep holes to be machined.

[0020] Optionally, the diameter of the positioning hole is equal to the diameter of the rough-machined bottom hole.

[0021] A tool for the deep hole machining method of the combined materials is provided, and the tool is a rear-guided reaming cutter, which comprises a reaming segment and a guiding segment connected with each other, the diameter of the reaming segment is equal to the diameter of the reaming hole, and the diameter of the guiding segment is equal to the diameter of the guiding hole.

[0022] The present application provides a combined material part, and the deep hole of the combined material part is machined by the method.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] The application discloses a deep hole machining method of multiple material combinations, which comprises the following steps: firstly, rough machining is performed on bottom holes of each assembly part in a single-piece state; the diameter of the rough-machined bottom hole is smaller than a target hole diameter; the rough machining of the hole has low precision requirement, which can effectively reduce the difficulty of direct machining of the multiple material combinations, improve machining efficiency, and leave a working allowance for subsequent fine machining, thereby ensuring the precision of the final hole diameter; then, the rough-machined bottom holes of the assembly parts are aligned and positioned to form a to-be-machined deep hole, and the to-be-machined deep hole is machined to obtain an expanded hole; the expanded hole machining can correct the axial deviation of the hole, so that the axial line of the hole is closer to the ideal state, and provides an accurate reference for subsequent machining; the diameter of the expanded hole is greater than that of the to-be-machined deep hole and smaller than the target hole diameter, and the depth of the expanded hole is smaller than the target hole depth; the diameter of the hole gradually approaches the target hole diameter through the expanded hole machining, which reduces the subsequent machining error, reduces the cutting force and cutting heat, provides better machining conditions for subsequent machining, and further improves the machining efficiency and quality; the expanded hole is machined to obtain a pilot hole, and the pilot hole is machined to obtain a pre-machined deep hole; the parts processed in this process gradually approach the standard of the target hole, effectively inhibiting the deflection and vibration in the machining process, and ensuring the quality of the machined hole; finally, the pre-machined deep hole is machined to expand the diameter of the pre-machined deep hole to the target hole diameter, and the deep hole machining of the multiple material combinations is completed; the expanded hole milling cutter of the rear pilot type and the front pilot type reamer can be used in the machining process in sequence, so that the stability and precision in the machining process are ensured, especially the guiding property in the deep hole machining, the tool deflection and vibration caused by the long machining path are avoided, and the precision and machining efficiency of the final deep hole machining are ensured.

[0025] The rough-machined bottom hole satisfies D1=D-(0.5-0.9mm), wherein D is the target hole diameter, and D1 is the diameter of the rough-machined bottom hole; preferably, D1=D-0.7mm, which reserves sufficient working allowance for subsequent machining, allows the use of a more efficient machining strategy in the subsequent steps, reduces the number of tool changes, simplifies the machining procedure, helps to ensure that the diameter surface of the finally machined hole has good quality and meets the design requirements.

[0026] The expanded hole satisfies D2=D-(0.2-0.4mm) and L1=L / 4-L / 2, wherein D2 is the diameter of the expanded hole, L is the target hole depth, and L1 is the depth of the expanded hole; preferably, the expanded hole satisfies D2=D-0.3mm and L1=L / 3; by reasonably setting the depth L1 of the expanded hole, the time of the expanded hole and the subsequent fine machining can be balanced, the overall machining efficiency is prevented from being reduced due to the long time of a certain step, and the gap between the suitable expanded hole diameter D2 and the target hole diameter D is relatively small, so that the amount of material to be removed in the expanded hole process is relatively small, thereby reducing the cutting force and cutting heat, helping to improve the machining efficiency and reduce the risk of tool wear and damage, and prolonging the service life of the tool.

[0027] All the cutters used in the processing process adopt the down chip structure, and the down chip structure mainly refers to a special structure used for discharging the cutting chips generated in the deep hole processing from the hole. The structure is usually designed in the drill rod part of the cutter to ensure that the cutting chips can be smoothly discharged from the hole bottom to the outside of the hole, avoid blocking and affect the processing efficiency, and solve the problem of long path.

[0028] The application provides a positioning block for the deep hole processing method of the combined parts of multiple materials, the positioning block comprises positioning segments and positioning pins, positioning holes are processed on each positioning segment, and the positions of the positioning holes correspond to deep holes to be processed respectively; during deep hole processing, the positioning pins extend to the corresponding positioning holes in the deep holes to be processed except the deep hole to be processed.

[0029] The diameter of the positioning hole is equal to the diameter of the bottom hole after rough processing, so that the positioning pin and the positioning hole are tightly matched, and the positioning accuracy is further improved.

[0030] The application also provides a cutter for the deep hole processing method of the combined parts of multiple materials, the cutter is a rear guide type reaming milling cutter, comprises a reaming segment and a guide segment connected with each other, the diameter of the reaming segment is equal to the diameter of the reaming hole, and the diameter of the guide segment is equal to the diameter of the guide hole. The cutter meets the requirements of reaming and guarantees the guidance in the processing process, and the processing accuracy and efficiency are improved.

[0031] The application provides a combined part of multiple materials, and the deep hole of the combined part of multiple materials is processed by the method. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic diagram of the deep hole processing method of the combined parts of multiple materials.

[0033] Figure 2 It is a schematic diagram of the hole processing process of the deep hole processing method of the combined parts of multiple materials.

[0034] Figure 3 It is a schematic diagram of the positioning segment in the embodiment of the application.

[0035] Figure 4 It is an assembly schematic diagram of the positioning segment in the embodiment of the application.

[0036] Figure 5 It is a schematic diagram of the rear guide type reaming milling cutter.

[0037] Figure 6 Schematic view of the front guide reamer

[0038] Wherein, 1-positioning section, 2-positioning hole, 3-positioning pin, 4-bore section, 5-guide section, 6-positioning block, 7-front guide reamer. DETAILED DESCRIPTION

[0039] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0040] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0041] The present application will be further described in detail below in conjunction with specific embodiments, which are an explanation of the present application rather than a limitation.

[0042] Referring to Figure 1 The present application provides a multi-material combination deep hole machining method, comprising:

[0043] S1: rough machining of the bottom hole in a single piece state; the bottom hole diameter after rough machining is smaller than the target hole diameter; the rough hole machining has low precision requirements for the machining hole, which can effectively reduce the difficulty of direct machining after multi-material combination, improve the machining efficiency, and at the same time leave a working allowance for subsequent fine machining, ensuring the accuracy of the final hole diameter.

[0044] S2: aligning and positioning the bottom holes of each assembly part after rough machining to form a deep hole to be machined;

[0045] S3: processing the to-be-processed deep hole to obtain an expanded hole; the expanded hole is processed by using an expanded hole milling cutter, the expanded hole diameter is greater than the to-be-processed deep hole diameter and less than the target hole diameter, and the expanded hole depth is less than the target hole depth; the expanded hole processing can correct the hole axis deviation, so that the hole axis is closer to the ideal state, and provides an accurate reference for subsequent processing; the expanded hole diameter is greater than the to-be-processed deep hole diameter and less than the target hole diameter, and the expanded hole depth is less than the target hole depth; through the expanded hole processing, the hole diameter gradually approaches the target hole diameter, the subsequent processing error is reduced, the expanded hole processing can reduce the chip force and cutting heat, better processing conditions are provided for subsequent processing, and the processing efficiency and quality are further improved;

[0046] S4: processing the expanded hole to obtain a guide hole; the guide hole is processed by using a reamer, the guide hole diameter is greater than the expanded hole diameter and less than the target hole diameter, and the guide hole depth is less than the target hole depth;

[0047] S5: processing the guide hole to obtain a pre-processed deep hole; a rear guide type expanded hole milling cutter is used, wherein the pre-processed deep hole depth is equal to the target hole depth, the front end diameter of the expanded hole milling cutter is equal to the expanded hole diameter, and the rear end diameter of the expanded hole milling cutter is equal to the guide hole diameter; the part processed in this process gradually approaches the standard of the target hole, and the deflection and vibration in the processing process are effectively inhibited, so that the quality of the processed hole is guaranteed;

[0048] S6: processing the pre-processed deep hole to expand the pre-processed deep hole diameter to the target hole diameter, and completing the deep hole processing of various material combinations; a front guide type reamer is used to process the pre-processed deep hole; the use of the front guide type reamer increases the guidance and stability of the processing process, and improves the stability of the processing and the accuracy of the processed hole.

[0049] Embodiment 1

[0050] Referring to Figure 1 and and Figure 2 , a certain rotor part is connected to nine component assemblies by using 24 precision bolts, and design requirements are that the connecting holes of the parts except the last part are processed by combination;

[0051] S1: rough processing bottom holes of each assembly part in a single piece state; the rough processed bottom hole satisfies D1=D-, wherein D is a target hole diameter, and D1 is a rough processed bottom hole diameter;

[0052] S2: aligning and positioning the rough processed bottom holes of each assembly part to form a to-be-processed deep hole;

[0053] S3: processing the to-be-processed deep hole by using an expanded hole milling cutter to obtain an expanded hole; the expanded hole satisfies D2=D-, and L1=L / 4~L / 2, wherein D2 is an expanded hole diameter, L is a target hole depth, and L1 is an expanded hole depth.

[0054] S4: adopt reamer to process the hole, get the guide hole; the guide hole meets: D2 < D3 < D, L2 = L1, wherein, D3 is the guide hole diameter, L2 is the guide hole depth;

[0055] S5: adopt the reamer of rear guide form to process the guide hole, get the pre-processed deep hole; the pre-processed deep hole depth is equal to the target hole depth, the front end diameter of the reamer is equal to the hole diameter, and the rear end diameter of the reamer is equal to the guide hole diameter;

[0056] S6: adopt the reamer of front guide form to process the pre-processed deep hole, expand the pre-processed deep hole diameter to the target hole diameter, and complete the deep hole processing of the multiple material combinations.

[0057] Through the control of the above processing method, the success rate of the deep hole processing of the rotor part is increased by 45%-50% compared with the existing processing method; the efficiency is increased to nearly 1 times.

[0058] Embodiment 2

[0059] Referring to Figure 1 and Figure 2 , a certain rotor part adopts 24 precision bolts to connect 9 subassemblies, and the design requires that the connecting holes of the remaining parts except the last part are processed by combination;

[0060] S1: process the bottom hole of each assembly part in a single piece state; the bottom hole after rough machining meets: D1 = D-0.7mm, wherein, D is the target hole diameter, and D1 is the hole diameter of the rough machining bottom hole;

[0061] S2: align and position the bottom holes of each assembly part after rough machining to form a deep hole to be processed; when aligning and positioning the bottom holes of each assembly part after rough machining, each positioning section 1 in the positioning block 6 shown in Figure 3 and Figure 4 is used for positioning, since the part to be processed is a thin-walled ring structure, the positioning section 1 is an arc mechanism, which is designed as four arc positioning sections 1, six positioning holes are arranged on each positioning section 1, the positioning section 1 is prefabricated in the cavity of the last part before combination processing, two positioning pins are installed in the positioning hole 2 on each positioning section 1, a total of eight positioning pins 3 are used, preferably, the positioning pin 3 can be a screw rod, which is convenient for pressing and positioning in the later stage, and the remaining subassemblies to be assembled are sequentially passed through the positioning pins to complete the positioning, and the positioning position of the positioning pin can be adjusted according to the processing position until all the deep holes to be processed are processed.

[0062] S3: use a hole expanding cutter to process the deep hole to be processed, and get an expanded hole; the expanded hole meets: D2 = D-0.3mm, L1 = L / 3, wherein, D2 is the hole diameter of the expanded hole, L is the target hole depth, and L1 is the expanded hole depth.

[0063] S4: adopt reamer to process the hole, get the guide hole; the guide hole meets: D3=D-0.15mm, L2=L1, wherein, D3 is the guide hole diameter, L2 is the guide hole depth;

[0064] S5: adopt the reamer to process the guide hole, get the pre-processed deep hole; the pre-processed deep hole depth is equal to the target hole depth, the front end diameter of the reamer is equal to the hole diameter, the rear end diameter of the reamer is equal to the guide hole diameter; see Figure 5 The rear guide type reamer structure diagram, the reamer includes the hole section 4 at the front end and the guide section 5 at the rear end, the diameter of the hole section 4 is equal to the hole diameter, the diameter of the guide section 5 is equal to the guide hole diameter, the hole section 4 at the front end and the guide section 5 at the rear end are integrally connected, the diameter gradually transitions from the hole diameter size to the guide hole diameter size, and the transition section length is L / 6;

[0065] S6: adopt the front guide type reamer to process the pre-processed deep hole, expand the pre-processed deep hole diameter to the target hole diameter, complete the deep hole processing of the multiple material combinations. See Figure 6 The front guide type reamer 7 front end cutter diameter is equal to the size of the guide hole diameter, gradually transition to the size of the target hole diameter, the transition section is L / 6;

[0066] Through the control of the above processing method, the success rate of the deep hole processing of the rotor part is increased by 56% compared with the existing processing method; the efficiency is increased to nearly 1 times

[0067] In addition, all the cutters used in the processing process adopt the down chip structure. The down chip structure mainly refers to the special structure used for discharging the cutting chips generated in the deep hole processing from the hole. This structure is usually designed in the drill rod part of the cutter to ensure that the cutting chips can be smoothly discharged from the hole bottom to the outside of the hole, avoid blocking and affecting the processing efficiency, and solve the problem of chip removal due to long path.

[0068] See Figure 3 Figure 4 A positioning block for the above-mentioned deep hole processing method of multiple material combinations, the positioning block comprises a plurality of positioning sections 1 and a plurality of positioning pins 3, a positioning hole 2 is processed on each positioning section 1, and the positions of the positioning holes 2 correspond to a to-be-processed deep hole respectively; during deep hole processing, the positioning pins 3 extend into the positioning holes 2 corresponding to the to-be-processed deep hole except the to-be-processed deep hole to be processed. Through the design of the positioning section and the positioning pin, accurate positioning of the multiple material combination parts is realized, and the accuracy and consistency of the deep hole processing are ensured. Optionally, the diameter of the positioning hole 2 is equal to the diameter of the rough-machined bottom hole, so as to ensure the close cooperation between the positioning pin and the positioning hole, and further improve the positioning accuracy.

[0069] Referring to Figure 5 A cutter for the above-mentioned multi-material combined deep hole machining method is a rear guide type reaming cutter, comprising a reaming section 4 and a guide section 5 connected with each other, the diameter of the reaming section 4 is equal to the reaming hole diameter, and the diameter of the guide section 5 is equal to the guide hole diameter. The cutter meets the requirements of reaming and ensures the guidance in the machining process, thereby improving the machining precision and efficiency.

[0070] The present application provides a multi-material combined part, and the deep hole on the multi-material combined part is machined by the above-mentioned method. The deep hole has high precision and good surface quality, meets the high requirements of complex parts in the field of aero-engines on deep hole machining, and lays a good foundation for the development of the field of aero-engines.

[0071] In summary, the present application provides a multi-material combined deep hole machining method, a positioning block, a cutter and a part. By rough machining the bottom hole of each assembled part in a single piece state, the bottom hole diameter after rough machining is smaller than the target hole diameter, thereby reducing the difficulty of direct machining after multi-material combination, improving the machining efficiency, and leaving a working allowance for subsequent fine machining, thereby ensuring the precision of the final hole diameter. Then, the bottom holes of the rough machined assembled parts are aligned and positioned to form a deep hole to be machined, and a reaming cutter is used to machine the deep hole to be machined to obtain a reamed hole. The reaming machining can correct the axial deviation of the hole, make the axial line of the hole closer to the ideal state, provide an accurate reference for subsequent machining, and further improve the machining efficiency and quality. A reamer is used to machine the reamed hole to obtain a guide hole, and a rear guide type reaming cutter is used to machine the guide hole to obtain a pre-machined deep hole. The parts processed in this process gradually approach the standard of the target hole, effectively suppress the deflection and vibration in the machining process, and ensure the quality of the machined hole. Finally, a front guide type reamer is used to machine the pre-machined deep hole to expand the pre-machined deep hole diameter to the target hole diameter, and the multi-material combined deep hole machining is completed. The stability and precision in the machining process are ensured, especially the guidance in the deep hole machining, thereby ensuring the precision and machining efficiency of the final deep hole machining. The method is simple and easy to operate, and provides a reliable and practical machining direction and improvement direction for such multi-material combined deep hole machining.

[0072] The above-mentioned is only the preferred embodiment of the present application, and does not limit the technical solutions of the present application in any way. Those skilled in the art should understand that the technical solutions can be modified and replaced in several simple ways without departing from the spirit and principles of the present application, and these modifications and replacements also belong to the protection scope covered by the claims.

Claims

1. A method for deep hole machining of multiple materials, characterized in that: include: Perform bottom hole roughing on each assembled part in a single-piece state; the bottom hole diameter after roughing is smaller than the target hole diameter; Align and position the bottom holes of each assembly part after rough machining to form the deep hole to be machined; The deep hole to be processed is processed to obtain an expanded hole; the expanded hole diameter is larger than the diameter of the deep hole to be processed and smaller than the target hole diameter; the expanded hole depth is smaller than the target hole depth; Processing the expanded hole to obtain a guide hole; the guide hole diameter is larger than the expanded hole diameter and smaller than the target hole diameter; the guide hole diameter is smaller than the target hole depth; Processing the guide hole to obtain a pre-processed deep hole; wherein the depth of the pre-processed deep hole is equal to the target hole depth; The pre-processed deep hole is processed to expand the diameter of the pre-processed deep hole to the target diameter, completing the deep hole processing of multiple material combinations.

2. The multi-material combination deep hole processing method according to claim 1, characterized in that: The bottom hole after rough machining satisfies: D1=D-(0.5~0.9mm), where D is the target hole diameter and D1 is the bottom hole diameter after rough machining.

3. The multi-material combination deep hole processing method according to claim 2, characterized in that: The bottom hole after rough machining satisfies: D1=D-0.7mm.

4. The multi-material combination deep hole processing method according to claim 1, characterized in that: The hole expansion satisfies: D2=D-(0.2~0.4mm), L1=L / 4~L / 2, wherein D2 is the hole expansion diameter, L is the target hole depth, and L1 is the hole expansion depth.

5. The multi-material combination deep hole processing method according to claim 4, characterized in that: The hole expansion satisfies: D2=D-0.3mm, L1=L / 3.

6. The multi-material combination deep hole processing method according to claim 1, characterized in that: All cutting tools used in the machining process adopt the bottom chip removal structure.

7. The multi-material combination deep hole processing method according to any one of claims 1 to 6, characterized in that: During the processing, a positioning block is used to assist in the combined deep hole processing of various materials. The positioning block comprises a plurality of positioning segments (1) and a plurality of positioning pins (3). A positioning hole (2) is processed on each positioning segment (1). The positions of the positioning holes (2) respectively correspond to a deep hole to be processed. When deep hole processing is performed, the positioning pin (3) passes through the deep hole to be processed except for the deep hole to be processed and extends to the positioning hole (2) corresponding to the deep hole to be processed.

8. The multi-material combination deep hole processing method according to claim 7, characterized in that: The aperture of the positioning hole (2) is equal to the aperture of the bottom hole after rough machining.

9. The multi-material combination deep hole processing method according to any one of claims 1 to 6, characterized in that: The tool used in the processing is a rear-guided reaming milling cutter, comprising a reaming section (4) and a guiding section (5) connected to each other, wherein the diameter of the reaming section (4) is equal to the reaming hole diameter, and the diameter of the guiding section (5) is equal to the guiding hole diameter.

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