Reamer for deep hole machining

Abstract

The utility model relates to a reamer for deep hole machining, including handle and tool bit, the rear end of handle has the installation part, the front part of installation part integrally sets up long stretch into section, long stretch into section is used for stretching into deep hole when processing hole, the front end of long stretch into section coaxially installs tool bit, and the front section of long stretch into section is provided with mounting hole, and tool bit has blade part and tail head, and tail head sets up in mounting hole through the mode of hot mounting. The utility model discloses handle front part has long stretch into section, and can stretch into deep hole when processing hole, and the front end of long stretch into section is provided with tool bit, because the part of stretching into hole when processing deep hole is on handle, the size of tool bit can be very short, and the material is saved greatly, and the cost of replacement is lower after tool wear, and, install through the mode of thermal expansion and cold shrink, only need to process the circumferential surface and hole surface, and there is no extra structure, and processing is convenient, and the processing cost is low, and, the assembly mode of thermal expansion and cold shrink is convenient to assemble and disassemble.

Description

Technical Field

[0001] This utility model relates to a reamer, and more particularly to a reamer for machining deep holes, belonging to the category of machining tools. Background Technology

[0002] Reamers are widely used hole-making tools in machining. A reamer consists of two parts: a cutter head and a tool shank. The cutter head is mounted on the tool shank and is used for cutting. The tool shank has a mounting part for mounting on a machine tool. In existing technology, there are two main structural forms of cutter heads used for machining deep holes with carbide reamers. One of these is the solid carbide reamer form, such as... Figure 1 As shown, the main drawback is quite obvious: the entire reamer is made of cemented carbide, which wastes tool material. Once the reamer wears out, it must be scrapped entirely.

[0003] Another structural form uses a threaded connection between the reamer head and the shank. This means the interchangeable-head reamer head is connected to the shank via a threaded structure. The main disadvantages are: complex structure, difficulty in controlling precision, and high manufacturing cost. This is primarily because controlling the concentricity of the threaded connection is challenging.

[0004] In summary, existing reamer technology has various shortcomings and needs to be improved. Utility Model Content

[0005] The purpose of this utility model is to provide a reamer for deep hole machining, so as to provide a new type of reamer for deep hole machining.

[0006] To solve the above problems, the deep hole reamer involved in this utility model adopts the following technical solution: A deep hole reamer includes a shank and a cutting head. The rear end of the shank has a mounting part, and the front part of the mounting part is integrally provided with a long extension section. The long extension section is used to extend into the deep hole when machining the hole. The cutting head is coaxially mounted on the front end of the long extension section. The front section of the long extension section is provided with a mounting hole. The cutting head has a cutting edge and a tail end. The tail end is set in the mounting hole by heat fitting.

[0007] The diameter of the cutting edge of the blade is larger than the diameter of the long extension section.

[0008] The blade and the tail have a rearward stepped surface, which is a positioning surface that fits and positions with the front end face of the long extension section.

[0009] The stepped surface between the cutting edge and the tail is a finely ground surface, and the front end surface of the long extension section is also a finely ground surface.

[0010] The coaxiality between the extended section and the cutter head is ensured by the coaxiality between the cutting edge and the tail end, as well as the coaxiality between the mounting hole and the tail end.

[0011] The coaxiality of the cutting edge and the tail is within 0.0015 mm.

[0012] The coaxiality between the mounting hole and the tail end is within 0.0015mm.

[0013] The stepped surface between the cutting edge and the tail is perpendicular to the axis of the extended section.

[0014] The mounting hole is a stepped hole with an flared inner section, and the tail end enters the inner section of the mounting hole.

[0015] The cooling holes inside the tool holder extend forward to communicate with the mounting holes.

[0016] The tool holder of this utility model has a long extension section at the front, which can extend into the deep hole when machining. A cutting head is provided at the front end of the long extension section. Because the part that extends into the hole is on the tool holder when machining deep holes, the size of the cutting head can be made very short, which saves a lot of material. The cost of replacing the tool after it is worn out is low. Moreover, it is installed by means of thermal expansion and contraction, which only requires machining the peripheral surface and the hole surface. There are no extra structures, making it easy to process and low in processing cost. In addition, the assembly and disassembly are relatively convenient due to the thermal expansion and contraction assembly method.

[0017] The diameter of the cutting edge of this utility model is larger than the diameter of the long extension section. The long extension section can easily enter the deep hole being machined without interfering with the hole wall. Compared with the cutting edge diameter and the long extension section diameter being equal, the required machining accuracy is lower, the machining is more convenient, and the cost is lower.

[0018] This invention enhances the connection rigidity by fitting the stepped surface between the blade and the tail end with the front end face of the long extension section for positioning, and the positioning surface is relatively simple to process, reducing the processing difficulty.

[0019] The mounting hole of this invention has a stepped hole with an flared end. The tail end enters the inner section of the mounting hole, which can release the elastic deformation caused by friction during installation. In addition, the tail end of the inner section of the mounting hole can also be positioned between the tail end and the long extension section, ensuring reliable installation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below: Figure 1 This is a schematic diagram of the structure of a reamer in the prior art; Figure 2 This is a schematic diagram of the structure of the utility model in this embodiment; Figure 3 for Figure 2 A schematic diagram of the cutter head structure; Figure 4 for Figure 2A schematic diagram of the middle tool holder. Detailed Implementation

[0021] To make the technical objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model; that is, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] The specific embodiments of the deep hole reamer involved in this utility model are as follows: Figures 2-4 In this design, the tool holder 1 has two parts: a rear mounting part 2, which is used to mount the reamer on a rotating part of the machine tool. Therefore, the mounting part has a keyway for mounting. This part of the structure is existing technology; the mounting structure has not been improved and is the same as existing technology. A long extension section 3 is provided at the front of the mounting part 2. The long extension section 3 is integrally formed with and coaxial with the mounting part 2. During operation, the long extension section 3 can extend into a deep hole. A mounting hole 4 is provided at the front of the long extension section 3. The mounting hole 4 is a stepped hole with a flared inner end. The front end face of the long extension section 3 is a finely ground surface. A tool head 5 is coaxially mounted at the front end of the long extension section 3. The tool head 5 has a cutting edge 6 and a tail end 7, which are coaxially arranged. The tail end 7 is heat-fitted into the mounting hole 4. Furthermore, the tail end 7 can enter the inner section of the mounting hole 4. There is a rearward stepped surface 8 between the cutter head 5 and the tail head 7. The stepped surface 8 is a positioning surface, which is a finely ground surface. The stepped surface 8 is fitted and positioned with the front end face of the long extension section 3.

[0023] Furthermore, the diameter of the cutting edge of the blade is larger than the diameter of the long extension section.

[0024] Furthermore, the coaxiality between the extended section 3 and the cutter head 5 is ensured by the coaxiality between the cutting edge 6 and the tail end 7, as well as the coaxiality between the mounting hole 4 and the tail end 7.

[0025] Furthermore, the coaxiality of the cutting edge 6 and the tail 7 is within 0.0015 mm.

[0026] Furthermore, the coaxiality between the mounting hole 4 and the tail end 7 is within 0.0015mm.

[0027] Furthermore, the stepped surface 8 between the blade 6 and the tail 7 is perpendicular to the axis of the long extension section 3.

[0028] Furthermore, the cooling hole 9 provided inside the tool holder 1 extends forward to communicate with the mounting hole 4.

[0029] In the above embodiments, the diameter of the cutting edge of the blade is larger than the diameter of the long extension section. In other embodiments, the diameter of the cutting edge of the blade may also be equal to the diameter of the long extension section.

[0030] In the above embodiments, the stepped surface is positioned by fitting the front end surface of the long extension section. In other embodiments, the circumferential surface between the tail end and the mounting hole can also be used for positioning.

[0031] In the above embodiment, the stepped surface between the cutting edge and the tail is a finely ground surface, and the front end surface of the long extension section is also a finely ground surface. The two are positioned by the finely ground surface. In other embodiments, other finely machined surfaces can also be used.

[0032] In the above embodiments, the coaxiality between the extended section and the cutter head is ensured by the coaxiality between the cutting edge and the tail end, as well as the coaxiality between the mounting hole and the tail end. Ensuring coaxiality through coaxiality is the simplest method. In other cases, other dimensional relationships can also be used to ensure the coaxiality between the extended section and the cutter head.

[0033] In the above embodiments, the coaxiality of the cutting edge and the tail is within 0.0015 mm, and the coaxiality of the mounting hole and the tail is within 0.0015 mm. In other embodiments, the coaxiality can be adjusted according to the precision of the manufactured product.

[0034] In the above embodiment, the stepped surface between the cutting edge and the tail is perpendicular to the axis of the long extension section. In other embodiments, it can also be positioned by an inclined surface.

[0035] In the above embodiments, the mounting hole is a stepped hole with an flared inner section, and the tail end enters the inner section of the mounting hole. In other embodiments, the mounting hole can also be set as a straight hole.

[0036] In the above embodiment, the cooling hole provided in the tool holder extends forward to communicate with the mounting hole. In other embodiments, the cooling hole may also bypass the mounting hole and extend directly to the front end of the long extension section.

[0037] Finally, it should be noted that the above embodiments are only for illustration and not for limiting the technical solutions of this utility model. Any equivalent substitutions and modifications or partial substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of protection of the claims of this utility model.

Claims

1. A reamer for deep hole machining, comprising a shank and a cutting head, wherein the rear end of the shank has a mounting portion, characterized in that, The front part of the mounting part is integrally provided with a long extension section, which is used to extend into the deep hole when machining the hole. A cutting head is coaxially mounted on the front end of the long extension section. The front section of the long extension section is provided with a mounting hole. The cutting head has a cutting edge and a tail end. The tail end is set in the mounting hole by heat fitting.

2. The reamer for deep hole machining according to claim 1, characterized in that, The diameter of the cutting edge of the blade is larger than the diameter of the long extension section.

3. The reamer for deep hole machining according to claim 2, characterized in that, The blade and the tail have a rearward stepped surface, which is a positioning surface that fits and positions with the front end face of the long extension section.

4. The reamer for deep hole machining according to claim 3, characterized in that, The stepped surface between the cutting edge and the tail end is a finely ground surface, and the front end surface of the long extension section is also a finely ground surface.

5. The reamer for deep hole machining according to any one of claims 1-4, characterized in that, The coaxiality between the extended section and the cutter head is ensured by the coaxiality between the cutting edge and the tail end, as well as the coaxiality between the mounting hole and the tail end.

6. The reamer for deep hole machining according to claim 5, characterized in that, The coaxiality of the cutting edge and the tail is within 0.0015 mm.

7. The reamer for deep hole machining according to claim 6, characterized in that, The coaxiality between the mounting hole and the tail end is within 0.0015mm.

8. The reamer for deep hole machining according to claim 7, characterized in that, The stepped surface between the cutting edge and the tail is perpendicular to the axis of the extended section.

9. The reamer for deep hole machining according to claim 1, characterized in that, The mounting hole is a stepped hole with an flared inner section, and the tail end enters the inner section of the mounting hole.

10. The reamer for deep hole machining according to claim 1, characterized in that, The cooling hole inside the tool holder extends forward to connect with the mounting hole.

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