A high-precision double-end cutting combined reamer

Abstract

The present invention relates to a high-precision double-end cutting combination reamer. It comprises a shank, a cutter head and a connecting rod. Cutting parts are provided at both ends of the cutter head, and the inside of the cutter head has symmetrical inner tapered holes, and the inner tapered holes are all structures with a large outer end and a small inner end. The cutter head and the cutter head are connected by a connecting rod, and are connected and coaxially adjusted by a sleeve structure, a columnar structure and corresponding symmetrical or evenly distributed set screws. When in use, when the cutting part at one end is worn, it can be turned over and the cutting part at the other end can be used for cutting, and coaxiality adjustment can be achieved through structures such as set screws, so that the accuracy of the reamer after reversing still meets the requirements of high-precision processing. Compared with the prior art, not only is the material utilization rate greatly improved, but the characteristics of high-precision processing are still guaranteed, and it has the advantages of high material utilization rate, high processing accuracy, and convenient disassembly and replacement.

Description

Technical Field

[0001] The invention relates to a high-precision double-end cutting combined reamer. Background Art

[0002] A reamer is a rotary tool with one or more teeth used to remove a thin layer of metal on the surface of a processed hole. A reamer is a rotary finishing tool with a straight or spiral blade, used for expanding or repairing holes. Due to the small amount of cutting, the machining accuracy requirements of a reamer are usually higher than those of a drill bit. It can be operated manually or installed on a drilling machine. A reamer is used to ream holes that have been drilled (or expanded) on a workpiece, mainly to improve the machining accuracy of the hole and reduce the roughness of its surface. It is a tool used for finishing and semi-finishing holes, and the machining allowance is generally very small. The reamer structure is mostly composed of a working part and a shank. The working part mainly has the functions of cutting and calibration, and the diameter of the calibration point has a reverse taper. The shank is used to be clamped by a fixture, and is divided into a straight shank and a tapered shank.

[0003] As a finishing tool, reamer is usually the last step in hole processing, which requires that the surface roughness and cylindricity of the hole after reaming should reach very high precision.

[0004] Traditional reamers can be roughly divided into the following categories:

[0005] 1. Traditional one-piece reamer: the reamer head and the shank are an integrated structure. Since the reamer has high requirements on the material and the material cost is high, and the blade will wear out during use, the one-piece reamer will be scrapped as a whole after reaching the end of its service life and cannot be reused, resulting in a large amount of material waste and extremely low material utilization. The reamer wears out quickly, and frequent scrapping leads to high costs for purchasing the reamer.

[0006] 2. Blade welding reamer: This type of reamer has a blade welded on the shank. When the blade is worn, it can be unsoldered and re-welded with a new blade. Although this type of reamer saves materials, the heating during welding causes stress concentration on the reamer. In the subsequent processing, high-speed cutting generates high temperatures, the welding coating becomes thinner, and stress deforms. The accuracy of the processed hole diameter cannot be guaranteed, the stability is poor, and the requirements of high-precision processing cannot be met.

[0007] 3. Blade screw-connected reamer. This type of reamer has a threaded hole on the arbor, and the blade with a cutting edge is connected to the arbor by a screw. When the blade is worn, it can be replaced with a new blade by disassembling the screw. When this type of reamer is in use, due to its high-speed rotation, up to 4000 rpm, and the blade is continuously subjected to cutting force, the screw will become loose, causing the blade to shake slightly, affecting the processing accuracy of the hole. Therefore, it can only be used for low-precision hole processing. For example, for hole processing with a maximum difference of no more than 6μm in hole diameter, a cylindricity of no more than 5μm, and a high roughness requirement, this type of reamer cannot be used. On the other hand, since the multiple blades of the reamer are independently connected to the arbor, it is difficult to ensure that the cutting edges of each blade are accurately on the same circumference. High-precision instruments are required and a lot of time and energy are spent on tool adjustment. Improper adjustment will affect the processing accuracy.

[0008] 4. Blade screw connection type, such as the reamer disclosed in the invention patent with application publication number CN108555393A, the reamer blade is connected to one end of the arbor by a screw, the screw is set in a direction parallel to the axis of the arbor, and the blade needs to be connected to the end face of the arbor by multiple screws distributed circumferentially. This structure still has the problem that the blade is prone to loosening of the screws during high-speed cutting, resulting in the deflection of the blade edge, affecting the processing accuracy; moreover, when the blade is connected to the arbor, in order to ensure that the axis of the blade and the axis of the arbor are completely coincident, it is necessary to repeatedly adjust the tightness of each circumferentially distributed screw, the adjustment process is very cumbersome and laborious, and the slightest carelessness will seriously affect the processing accuracy, and the stability needs to be improved urgently. Therefore, this reamer still cannot achieve the processing of high-precision holes.

[0009] Therefore, in order to solve the problems of low material utilization rate of existing reamers resulting in high cost, unstable accuracy of existing processed holes and failure to meet high precision requirements, and inconvenient disassembly and replacement, there is an urgent need for a reamer with high material utilization rate, high processing accuracy and easy disassembly and replacement. Summary of the invention

[0010] The purpose of the present invention is to provide a high-precision double-end cutting combination reamer which has high material utilization rate, high processing accuracy and can be easily disassembled and replaced.

[0011] The technical solution of the present invention is as follows:

[0012] A high-precision double-end cutting combination reamer comprises:

[0013] The cutter head is used for cutting, and has a plurality of blades distributed on the outer surface. Both ends of each blade have a cutting portion for cutting. The cutter head is coaxially provided with two sections of inner tapered holes, which are interconnected and symmetrically arranged, and the outer ends of the two sections of the inner tapered holes are larger and the inner ends are smaller;

[0014] Tool bar;

[0015] The connecting rod comprises a middle section and a cutter head connecting section and a cutter rod connecting section respectively arranged at two ends of the middle section. The outer surface of the cutter head connecting section is an outer conical surface. The cutter head connecting section can be selectively plugged and matched with one section of the inner conical hole of the cutter head through its outer conical surface. When the cutting part at one end of the cutter head is worn, it can be turned over and the cutting part at the other end can be used.

[0016] The tool rod connecting section and one end of the tool rod that cooperate with each other include a sleeve structure with an installation cavity and a columnar structure that is adapted and plugged therein. The sleeve structure is provided with two threaded through holes that are symmetrically arranged about the axis or at least three circumferentially evenly distributed. Set screws are screwed onto the threaded through holes. The threaded through holes are connected to the installation cavity so that the ends of the set screws can enter the installation cavity. Each set screw abuts against the outer surface of the columnar structure to achieve the connection between the tool rod and the connecting rod. The coaxiality of the cutter head and the tool rod can be fine-tuned by adjusting each set screw.

[0017] The beneficial effects of this program are as follows:

[0018] 1. The reamer adopts a split structure, so that the cutter head as a consumable part can be easily replaced, thereby improving the economy of the reamer;

[0019] 2. Since the two ends of the cutter head have cutting parts and the inner hole is two symmetrically arranged inner tapered holes, the cutting part of one end of the cutter head can be turned over and installed on the connecting rod through the other side after being worn out due to long-term use, so that the cutting part of the other end can continue to be used. However, if it is only the structural feature of flipping, it is bound to cause some slight changes in the matching accuracy of the reamer, and the reamer is a high-precision machining tool. After flipping, its error will seriously affect the final machining accuracy. The structural design of the connecting rod, the tool rod, and the mutually coordinated plug-in structure and the set screw makes it possible to adjust the coaxiality between the tool head and the tool rod after flipping, thereby compensating for the error and achieving the purpose of high-precision machining. In fact, the cutter head of this scheme is a high-precision machining tool, and both ends of it can achieve the purpose of high-precision machining by adjustment when in use;

[0020] 3. Compared with traditional reamers, the connecting rod that was originally part of the cutter head can also be reused, further reducing the amount of consumables;

[0021] 4. The connection between the tool bar and the connecting rod is realized by multiple set screws. Since the set screws are evenly distributed around the circumference, the coaxiality between the tool bar and the connecting rod can be adjusted with the adjustment instrument, which is impossible with the prior art. It has a great influence on the coaxiality of the reamed hole, and can greatly improve the coaxiality accuracy of the processed hole and reduce the coaxiality error. This is one of the prerequisites for high-precision processing. In addition, the setting of this adjustment structure can also compensate for the errors caused by the installation and processing of various parts and machine tools;

[0022] 5. Because the cutter head and the connecting rod cooperate through the inner tapered hole and the outer tapered surface, they can not only be precisely centered, but also fit each other very well, ensuring that the runout is very small during high-speed rotation;

[0023] 6. The cutter head and the connecting rod are matched with a taper, and the connecting rod and the cutter bar are tightly connected with precision-positioned screws. The connection is tight and stable, which makes the overall rigidity of the reamer higher, thereby further improving the processing accuracy.

[0024] Furthermore, one of the outer conical surface and the inner conical hole is provided with a stop pin, and the other is provided with a stop groove matched with the stop pin, and the cutter head and the connecting rod are matched with each other through the stop pin and the stop groove.

[0025] The beneficial effects of this solution are as follows: by setting the anti-rotation pin and the anti-rotation groove, the anti-rotation fit is more stable, and can withstand greater cutting forces and adapt to higher rotation speeds.

[0026] Furthermore, both sections of the inner conical holes are integrally provided with outwardly protruding anti-rotation pins, and the anti-rotation grooves are correspondingly provided on the outer conical surface.

[0027] Furthermore, the sleeve structure is arranged on the tool rod, the tool rod connecting section is a columnar structure, the outer dimensions of the tool rod connecting section are consistent with the installation cavity, and the tool rod connecting section and the installation cavity are anti-rotationally matched through an anti-rotation structure.

[0028] The beneficial effects of this solution are as follows: the setting of the anti-rotation structure makes the set screw not need to bear the cutting force, the load-bearing capacity is stronger, and the set screw is not easy to loosen or be damaged.

[0029] Furthermore, two outer anti-rotation planes parallel to the axis are symmetrically arranged on both sides of the end of the arbor connecting section to form a flat tail structure. The rear end of the mounting cavity has a anti-rotation hole corresponding to the flat tail structure. The hole wall of the anti-rotation hole is provided with symmetrically arranged inner anti-rotation planes. The inner and outer anti-rotation planes constitute the anti-rotation structure.

[0030] The beneficial effects of this solution are as follows: while realizing the function of anti-rotation cooperation between the two to transmit the main torque, the structure also has the characteristic of convenient cooperation.

[0031] Furthermore, the installation cavity is a tapered hole, and the tool rod connecting section is a tapered platform adapted thereto.

[0032] The beneficial effects of this solution are as follows: the structure makes the connection rod and the knife rod fit more closely, reduces the shaking amount between them as much as possible, and has a guiding effect during insertion and fitting.

[0033] On the basis of the above scheme, a further improvement is made as follows: screw positioning surfaces are arranged on the tool rod connecting section corresponding to each of the threaded through holes.

[0034] The beneficial effects of this solution are as follows: the setting of the screw positioning surface makes it difficult for the set screw to slide or misalign when docking with the connecting rod, further improving the positioning accuracy and facilitating the adjustment of the coaxiality between the tool rod and the connecting rod.

[0035] Based on the above solution, a further improvement is made as follows: the screw positioning surface is a plane.

[0036] The beneficial effects of this solution are as follows: the plane serves as the screw positioning surface. When it cooperates with the set screw, when the connecting rod moves relative to the knife rod, it ensures that each set screw always presses vertically against the screw positioning surface, so that the force on the set screw is always toward its own axis, and no bending moment occurs.

[0037] On the basis of the above scheme, a further improvement is as follows: a threaded hole coaxial with the connecting rod is provided on the end surface of the cutter head connecting section, and the cutter head is fixed relative to the connecting rod by the cooperation of the connecting screw and the threaded hole.

[0038] Based on the above solution, a further improvement is as follows: screw countersunk holes are respectively arranged coaxially with the inner tapered hole at both ends of the cutter head, so as to conveniently hide the connecting screws.

[0039] On the basis of the above scheme, a further improvement is made as follows: the number of threaded through holes on the sleeve structure is an even number and not less than four, and the threaded through holes are divided into two parallel rows along the axial direction of the sleeve structure.

[0040] The beneficial effects of this solution are as follows: the upper and lower rows can not only increase the firmness of the fixation, but also enable the connection rod to be adjusted to more angles.

[0041] Based on the above scheme, a further improvement is made as follows: there are eight threaded holes.

[0042] Based on the above solution, a further improvement is made as follows: among the blades of the cutter head, the angles between any two adjacent blades are different.

[0043] The beneficial effects of this solution are as follows: when running at high speed, the eight-tooth structure runs asymmetrically because of the different angles between the teeth, which makes the centripetal force better and facilitates cutting.

[0044] On the basis of the above scheme, a further improvement is made as follows: the cutter head is provided with eight cutting edges. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic cross-sectional view of the combined structure of an embodiment of a high-precision double-end cutting combined reamer of the present invention (without showing the set screw);

[0046] Figure 2 for Figure 1 The front view of the middle cutter head;

[0047] Figure 3 is a side view of the cutter head;

[0048] Figure 4 for Figure 3 Sectional view at AA in the middle;

[0049] Figure 5 for Figure 3 Sectional view at the middle BB;

[0050] Figure 6 for Figure 1 The front view of the middle connecting rod;

[0051] Figure 7 for Figure 6 A top view of

[0052] Figure 8 for Figure 6 Left view of;

[0053] Fig. 9 for Figure 6 A-direction view in the figure;

[0054] Fig.10 It is a front view of one end of the sleeve structure of the tool bar;

[0055] In the figure: 1-tool bar, 11-sleeve structure, 12-threaded through hole, 14-installation cavity, 15-inner anti-rotation plane; 2-tool head, 21-blade, 211-first cutting part, 212-second cutting part, 221-first inner tapered hole, 222-second inner tapered hole, 23-anti-rotation pin, 241-first screw countersunk hole, 242-second screw countersunk hole; 3-connecting rod, 31-middle section, 32-tool head connecting section, 321-outer conical surface, 322-anti-rotation groove, 323-threaded hole, 33-tool bar connecting section, 331-screw positioning surface, 332-outer anti-rotation plane, 4-connecting screw. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0057] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0058] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0059] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0060] One embodiment of the present invention: The combined reamer of the present invention can be used to process high-precision holes, and the rotation speed can be as high as 3000-4000 rpm. The roughness of the holes that can be processed can be guaranteed to be within Ra0.3 for ductile iron (the minimum reamer on the market is also above Ra1.0), and the roughness of steel parts can reach Ra0.007 (the minimum reamer on the market is also around Ra0.4), and the hole diameter requirements can be processed. High-precision holes with a difference of no more than 6μm and a cylindricality of no more than 5μm. The combined reamer not only ensures the high-precision characteristics of the integral cutter head, but also has the characteristics of the split cutter head being economical and convenient to replace, and the tool bar can also adjust the coaxiality between the entire reamer and the handle of the equipment and the coaxiality between the reamer's own cutter head and the cutter bar. In addition, the cutter head adopts eight blades. The more blades there are, the higher the cutting efficiency. Moreover, since the angles between the eight blades are different, it is an extremely asymmetric structure in the rotation field. When rotating at high speed, this asymmetry will make the centripetal force better, thereby achieving a better cutting effect.

[0061] like Figure 1-10 As shown, the high-precision double-end cutting combination reamer includes a tool rod 1, a tool head 2 and a connecting rod 3.

[0062] like Figure 2-5As shown, the cutter head 2 is used for cutting, and a plurality of blades 21 are distributed on the outer surface. In this embodiment, there are eight straight blades 21. Both ends of each blade 21 have a cutting portion for cutting. The cutting portion has a similar chamfered structure. When cutting, the cutting edge first contacts the hole wall of the cut hole. The cutter head 2 is coaxially provided with two sections of inner tapered holes. The two sections of inner tapered holes are interconnected and symmetrically arranged. The outer ends of the two sections of inner tapered holes are large and the inner ends are small, forming a shape similar to a waist or an hourglass.

[0063] like Figure 1 As shown, the structure at the rear end of the knife rod 1 is connected to the handle of the equipment, which is the prior art.

[0064] like Figure 1 , 6 As shown in , 7, the connecting rod 3 includes a middle section 31 and a cutter head connecting section 32 and a cutter rod connecting section 33 respectively arranged at both ends of the middle section 31. The outer surface of the cutter head connecting section 32 is an outer conical surface 321. The cutter head connecting section 32 can be selectively plugged into one section of the inner conical hole of the cutter head 2 through its outer conical surface 321. Figure 1 In the figure, the outer conical surface 321 is plugged into the second inner conical hole 222, and the first cutting portion 211 is in working state. When the first cutting portion 211 at one end of the cutter head 2 is worn, it can be turned over and the second cutting portion 212 at the other end can be used.

[0065] In one end of the tool bar connecting section 33 and the tool bar 1 that cooperate with each other, one is a sleeve structure 11 with a mounting cavity 14, and the other is a columnar structure adapted to be plugged therewith. In this embodiment, the sleeve structure 11 is arranged on the tool bar 1, and the tool bar connecting section 33 is a columnar structure. The outer dimensions of the tool bar connecting section 33 are consistent with the mounting cavity 14, and the tool bar connecting section 33 and the mounting cavity 14 are locked by a locking structure. The setting of the locking structure makes the set screw not need to bear the cutting force, and the bearing capacity is stronger, and the set screw is not easy to loosen or damage. In other embodiments, the sleeve structure 11 can also be arranged on the tool bar connecting section 33, and the columnar structure can be arranged on the tool bar 1. The sleeve structure 11 is provided with two threaded through holes 12 that are symmetrically arranged about the axis or at least three circumferentially evenly distributed. In this embodiment, the number of threaded through holes 12 on the sleeve structure 11 is an even number and not less than four, and the threaded through holes 12 are divided into two parallel rows along the axis direction of the sleeve structure 11. The upper and lower rows can not only increase the firmness of the fixation, but also realize the adjustment of the connecting rod 3 at more angles. There are eight threaded through holes 12 in this embodiment, which are divided into two rows, with four in each row, and the four threaded through holes 12 in each row are distributed at a 90° angle. A set screw is screwed on the threaded through hole 12, and the threaded through hole 12 is connected to the installation cavity 14 so that the end of the set screw can enter the installation cavity 14. Each set screw is matched with the outer surface of the columnar structure to realize the connection between the tool rod 1 and the connecting rod 3. By adjusting each set screw, the coaxiality of the cutter head 2 and the tool rod 1 can be finely adjusted.

[0066] More specifically, one of the outer conical surface 321 and the inner conical hole is provided with a stop pin 23, and the other is provided with a stop groove 322 adapted to the stop pin 23, and the cutter head 2 and the connecting rod 3 are matched with each other through the stop pin 23 and the stop groove 322. The setting of the stop pin 23 and the stop groove 322 makes the stability of the stop fit higher, and can withstand greater cutting force and adapt to higher rotation speeds. In this embodiment, the two sections of the inner conical holes are integrally provided with an outwardly convex stop pin 23, and the outer conical surface 321 is correspondingly provided with a stop groove 322. In other embodiments, the friction force can also be relied on to achieve stop rotation, thereby replacing the structure of the stop pin 23 and the stop groove 322. Or there is not one stop pin 23, but two or more, which are symmetrically arranged when two, and evenly distributed when three or more. In this embodiment, the stop pins 23 of the two sections of the inner conical holes are arranged in a collinear manner, and of course they may not be collinear in other embodiments.

[0067] like Figure 6-10 As shown, two outer anti-rotation planes 332 parallel to the axis are symmetrically arranged on both sides of the end of the tool rod connecting section 33 to form a flat tail structure, and the rear end of the installation cavity 14 has an anti-rotation hole corresponding to the flat tail structure, and the hole wall of the anti-rotation hole is provided with an inner anti-rotation plane 15 symmetrically arranged, and the inner and outer anti-rotation planes constitute the anti-rotation structure. This structure not only realizes the function of anti-rotation cooperation between the two to transmit the main torque, but also has the characteristic of convenient cooperation. The installation cavity 14 is a tapered hole, and the tool rod connecting section 33 is a tapered platform adapted thereto. This structure makes the fitting between the connecting rod 3 and the tool rod 1 more tightly, reduces the shaking amount of cooperation between each other as much as possible, and has a guiding effect during the insertion and cooperation. The tool rod connecting section 33 is provided with screw positioning surfaces 331 corresponding to each threaded through hole 12. The setting of the screw positioning surface 331 makes it difficult for the set screw to slide or misalign when docking with the connecting rod 3, further improves the positioning accuracy, and facilitates the adjustment of the coaxiality between the tool rod 1 and the connecting rod 3. The screw positioning surface 331 is a plane. The plane serves as the screw positioning surface 331. When it cooperates with the set screws, when the connecting rod 3 moves relative to the knife rod 1, it ensures that each set screw always vertically presses against the screw positioning surface 331, so that the force on the set screw is always toward its own axis without bending moment.

[0068] like Figure 1 , 6 As shown in FIG. 8 , a threaded hole 323 coaxial with the connecting rod 3 is provided on the end surface of the cutter head connecting section 32, and the cutter head 2 is fixed relative to the connecting rod 3 by the cooperation between the connecting screw 4 and the threaded hole 323. Screw countersunk holes coaxial with the inner tapered hole are provided at both ends of the cutter head 2, respectively, so that the connecting screw 4 can be conveniently hidden.

[0069] like Figure 3As shown, the angles between any two adjacent blades 21 of the cutter head 2 are different. When running at high speed, the eight-tooth structure has different angles, so the operation is asymmetrical, which makes the centripetal force better and is conducive to cutting.

[0070] The reamer of the present invention has the following characteristics:

[0071] 1. The reamer adopts a split structure, so that the cutter head 2 as a consumable part can be easily replaced, thereby improving the economy of the reamer;

[0072] 2. Since the two ends of the cutter head 2 have cutting parts and the inner hole is two symmetrically arranged inner tapered holes, the cutting part of one end of the cutter head 2 can be turned over and installed on the connecting rod 3 through the other side after being worn out due to long-term use, so that the cutting part of the other end can continue to be used. However, if it is only the structural feature of flipping, it is bound to cause some slight changes in the matching accuracy of the reamer, and the reamer is a high-precision machining tool. After flipping, its error will seriously affect the final machining accuracy. The structural design of the connecting rod 3, the tool bar 1, and the mutually coordinated plug-in structure and the set screw makes it possible to adjust the coaxiality between the cutter head 2 and the tool bar 1 after flipping, thereby compensating for the error and achieving the purpose of high-precision machining. In fact, the cutter head 2 of this scheme is used as a high-precision machining tool, and its two ends can achieve the purpose of high-precision machining by adjustment when in use;

[0073] 3. Compared with traditional reamer, the connecting rod 3, which is originally a part of the cutter head 2, can also be reused, further reducing the amount of consumables;

[0074] 4. The connection between the tool bar 1 and the connecting rod 3 is realized by a plurality of set screws. Since the set screws are evenly distributed around the circumference, the coaxiality between the tool bar 1 and the connecting rod 3 can be adjusted by coordinating instruments, which is impossible to achieve with the prior art. It has a great influence on the coaxiality of the reamed hole, and can greatly improve the coaxiality accuracy of the processed hole and reduce the coaxiality error, which is one of the prerequisites for high-precision processing. Moreover, the setting of this adjustment structure can also compensate for the errors caused by the installation and processing of various parts and machine tools;

[0075] 5. Since the cutter head 2 and the connecting rod 3 cooperate with each other through the inner tapered hole and the outer tapered surface 321, they can not only be precisely centered, but also have a high degree of fit with each other, ensuring that the runout is very small during high-speed rotation;

[0076] 6. The cutter head 2 and the connecting rod 3 are matched with a taper, and the connecting rod 3 and the cutter bar 1 are tightly connected with precision-positioned screws. The connection is tight and stable, which makes the overall rigidity of the reamer higher, thereby further improving the processing accuracy.

[0077] Regarding the attached pictures, Figure 1This is a structural diagram of the combined reamer in the combined state. It should be noted that the flat tail structure and the taper of the arbor connecting section are not shown in the figure, but are shown in other figures of this embodiment. According to the view relationship in the figure, from left to right are the connecting screw 4, the cutter head 2, the connecting rod 3, and the cutter head 1, wherein the connecting screw 4 is used to connect and fix the cutter head 2 with the cutter head connecting section 32 of the connecting rod 3. A threaded hole 323 is provided at the center of the cutter head connecting section 32, which can be screwed into the connecting screw 4, so that the cutter head 2 is pressed against the cutter head connecting section 32, and the connecting screw 4 can be hidden in the first screw countersunk hole. The cutter head connecting section 32 is inserted into the second inner tapered hole 222 of the cutter head 2, and is centered and positioned with the second inner tapered hole through its outer tapered surface 321. When inserted, the anti-rotation pin 23 on the second inner tapered hole is correspondingly inserted into the anti-rotation groove 322 of the outer tapered surface 321, thereby realizing anti-rotation fit. The middle section 31 is cylindrical, and the end faces at both ends thereof are tightly matched with the end faces of the cutter head 2 and the shank 1, respectively, so as to improve the overall rigidity. The shank connecting section 33 of the connecting rod 3 is inserted into the mounting cavity 14 of the sleeve structure 11 of the shank 1, and is centered and positioned with the structure of the tapered hole of the mounting cavity 14 through the structure of its conical platform, and is locked with the stop hole by the flat tail structure at its tail end. The stop structure is the main force transmission structure between the connecting rod 3 and the shank 1, and the two rows of eight threaded through holes 12 and the corresponding set screws provided on the sleeve structure 11 of the shank 1 can simultaneously be locked with the corresponding screw positioning surfaces 331 on the shank connecting section 33, so as to realize the connection and fixation between the shank 1 and the connecting rod 3, and when it is necessary to adjust the coaxiality between the shank 1 and the connecting rod 3 or to adjust the coaxiality between the entire reamer and the handle of the equipment, it can be achieved by fine-tuning the tightness of the set screw with the assistance of a reference instrument. When Figure 1 After the first cutting part 211 is worn, the connecting screw 4 can be removed, the cutter head 2 can be taken off, and after flipping it 180 degrees, the other end of the cutter head can be connected to the cutter head connecting section, that is, the cutter head 2 cooperates with the outer conical surface 321 and the stop groove 322 of the cutter head connecting section 32 through its first inner tapered hole 221 and the stop pin 23 therein, and then is connected and fixed by the connecting screw 4. Subsequently, with the assistance of equipment such as a comparator, the tightness of each set screw is adjusted to adjust the cutter head after the reversal, so that it meets the requirements of high-precision machining.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A high-precision double-end cutting combination reamer, characterized in that: include: The cutter head is used for cutting, and has a plurality of blades distributed on the outer surface. Both ends of each blade have a cutting portion for cutting. The cutter head is coaxially provided with two sections of inner tapered holes, which are interconnected and symmetrically arranged, and the outer ends of the two sections of the inner tapered holes are larger and the inner ends are smaller; Tool bar; The connecting rod comprises a middle section and a cutter head connecting section and a cutter rod connecting section respectively arranged at two ends of the middle section. The outer surface of the cutter head connecting section is an outer conical surface. The cutter head connecting section can be selectively plugged and matched with one section of the inner conical hole of the cutter head through its outer conical surface. When the cutting part at one end of the cutter head is worn, it can be turned over and the cutting part at the other end can be used. In the tool rod connecting section and the mutually matching end of the tool rod, one is a sleeve structure with an installation cavity, and the other is a cylindrical structure adapted to be plugged therein, the sleeve structure is provided with two threaded through holes symmetrically arranged about the axis or at least three circumferentially evenly distributed, and a locking screw is screwed on the threaded through hole, and the threaded through hole is connected to the installation cavity so that the end of the locking screw can enter the installation cavity, and each locking screw is abutted against the outer surface of the cylindrical structure to achieve the connection between the tool rod and the connecting rod, and the coaxiality of the cutter head and the tool rod can be fine-tuned by adjusting each locking screw; among the outer conical surface and the inner conical hole, one is provided with a stop pin, and the other is provided with a stop groove adapted to the stop pin, and the tool head and the connecting rod are locked by the stop pin and the stop groove; among the various blades of the tool head, the angles between any two adjacent blades are different.

2. A high-precision double-end cutting combination reamer according to claim 1, characterized in that: The two inner conical holes are integrally provided with outwardly protruding anti-rotation pins, and the outer conical surface is correspondingly provided with the anti-rotation grooves.

3. A high-precision double-end cutting combination reamer according to claim 1 or 2, characterized in that: The sleeve structure is arranged on the tool rod, the tool rod connecting section is a columnar structure, the outer dimensions of the tool rod connecting section are consistent with the installation cavity, and the tool rod connecting section and the installation cavity are anti-rotationally matched through an anti-rotation structure.

4. A high-precision double-end cutting combination reamer according to claim 3, characterized in that: Two outer anti-rotation planes parallel to the axis are symmetrically arranged on both sides of the end of the arbor connecting section to form a flat tail structure. The rear end of the mounting cavity has a anti-rotation hole corresponding to the flat tail structure. The hole wall of the anti-rotation hole is provided with symmetrically arranged inner anti-rotation planes. The inner and outer anti-rotation planes constitute the anti-rotation structure.

5. A high-precision double-end cutting combination reamer according to claim 3, characterized in that: The installation cavity is a tapered hole, and the tool rod connecting section is a tapered platform adapted thereto.

6. A high-precision double-end cutting combination reamer according to claim 3, characterized in that: The knife rod connecting section is provided with screw positioning surfaces corresponding to each of the threaded through holes.

7. A high-precision double-end cutting combination reamer according to claim 6, characterized in that: The screw positioning surface is flat.

8. A high-precision double-end cutting combination reamer according to claim 1 or 2, characterized in that: A threaded hole coaxial with the connecting rod is arranged on the end surface of the cutter head connecting section, and the cutter head is fixed relative to the connecting rod by the cooperation of the connecting screw and the threaded hole.

9. A high-precision double-end cutting combination reamer according to claim 8, characterized in that: The two ends of the cutter head are respectively provided with screw countersunk holes coaxially with the inner tapered hole.

10. The high-precision double-end cutting combination reamer according to claim 1, characterized in that: The number of threaded through holes on the sleeve structure is an even number and is not less than four, and the threaded through holes are divided into two parallel rows along the axial direction of the sleeve structure.

11. A high-precision double-end cutting combination reamer according to claim 10, characterized in that: There are eight threaded holes.

12. The high-precision double-end cutting combination reamer according to claim 1, characterized in that: There are eight blades on the blade head.

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