A bushing straight slot reamer

Abstract

The utility model discloses a sleeve type straight flute reamer, including the cutter head and the handle, the cutter head and handle between swing joint, the upper end top of cutter head is integrally formed with the setting of the plug -in column, the axle position of cutter head is along the axle center direction and is set with the connecting counterbore, and the top of connecting counterbore passes this plug -in column, and the top end face of this plug -in column is vertically set with the limit slot, the lower end of handle is set with the plug -in hole, the top of plug -in hole inner chamber is provided with the limit block, and the limit block is inserted in the limit slot, the top of plug -in hole inner chamber still vertically sets up with the connecting screw hole, the utility model discloses two limit blocks and limit slot cooperation, and the structural strength is high, and the ability of bearing rotating load is strong, reduces the risk of fracture, and the installation is more stable, and the design of straight flute chip flute, and the chip is directly discharged along the axial direction, avoids the accumulation, reduces the tool wear and tear and hole wall damage.

Description

Technical Field

[0001] This utility model relates to the field of cutting tools, specifically a sleeve-type straight groove reamer. Background Technology

[0002] A reamer is a rotary cutting tool with one or more cutting teeth used to remove a thin layer of metal from the surface of a machined hole. Reamers are rotary finishing tools with straight or spiral cutting edges used for enlarging or repairing holes.

[0003] For example, our company's earlier patent application, authorized by publication number CN223012061U, discloses a non-standard reamer with a radius (R) at the root, including a tool shank with a handle underneath; a cutting blade is mounted under the handle, the cutting blade has a radius (R) at its end, an arc-shaped groove is formed inside the handle, and a heat dissipation groove is formed inside the handle, the arc-shaped groove and the heat dissipation groove are connected, the heat dissipation groove is annular, and an auxiliary component is mounted on the outside of the heat dissipation groove. This non-standard reamer with a radius (R) at the root...

[0004] The cutting blade designed in the aforementioned patent is convenient for machining in conjunction with the tool holder. Through the non-standard design of reaming and root clearing, machining can be performed simultaneously, reducing the problem of inconsistent wear rates leading to reduced service life and the problem of increased maintenance costs due to separate cutting edge treatment. The R-angle on the cutting blade facilitates reaming and R-angle shaping, which not only reduces the need for tool changes and the increase in overall machining time, but also reduces the problem of the cumbersome handling of existing tool marks. However, the disadvantage of the aforementioned patent is that, because the R-angle is very small and generally contacts the workpiece first, it wears quickly, and after wear, the entire cutting tool needs to be replaced, which is inconvenient.

[0005] Therefore, it is necessary to improve such a structure to overcome the above-mentioned defects. Utility Model Content

[0006] The purpose of this utility model is to provide a sleeve-type straight groove reamer to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A sleeve-type straight groove reamer includes a cutter head and a handle, which are movably connected. An integrally formed insertion post is provided on the upper top of the cutter head. A countersunk hole is formed along the axial direction at the center of the cutter head, with the top of the countersunk hole passing through the insertion post. A limit groove is vertically formed on the top end face of the insertion post. An insertion hole is formed at the lower end of the handle, with a limit block provided at the top of the inner cavity of the insertion hole, which is inserted into the limit groove. A threaded hole is also vertically formed at the top of the inner cavity of the insertion hole. The cutter head and the handle are connected by a countersunk screw, which passes through the countersunk hole and then threaded into the threaded hole. A plurality of blade mounting seats are arranged in a circular array on the lower sidewall of the cutter head. One side of each blade mounting seat is a blade mounting surface, and a blade is mounted on the lower outer side of the blade mounting surface.

[0009] Furthermore, the limiting block and the limiting groove are in clearance fit.

[0010] Furthermore, the width of the limiting block is 16±0.5mm.

[0011] Furthermore, a total of eight blade mounting bases are provided.

[0012] Furthermore, the blade is welded and fixed to the blade mounting surface.

[0013] Furthermore, the outer lower end of the blade is provided with a radius (R-angle).

[0014] Furthermore, the R-corner extends beyond the bottom of the blade, and the bottom of the blade is flush with the lower end face of the cutter head, that is, the lower end of the R-corner extends beyond the lower end face of the cutter head.

[0015] Furthermore, the included angle between the side wall of the cutter head and the blade mounting surface is a chip removal groove, wherein the chip removal groove is vertically arranged.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The cutter head and cutter holder are easily replaceable due to their movable installation.

[0018] The two sets of limiting blocks and limiting grooves work together to achieve high structural strength, strong ability to withstand rotational loads, reduce the risk of breakage, and make installation more stable.

[0019] Countersunk screws provide axial fixation, preventing axial movement of the cutter head and tool holder and ensuring machining accuracy.

[0020] The straight flute chip removal design allows chips to be discharged directly along the axial direction, avoiding accumulation and reducing tool wear and hole wall damage. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a sleeve-type straight groove reamer.

[0022] Figure 2 This is a front view of a sleeve-type straight groove reamer.

[0023] Figure 3 This is a side view of a sleeve-type straight groove reamer.

[0024] Figure 4 This is a top view of a sleeve-type straight groove reamer.

[0025] Figure 5 for Figure 2 Sectional view along the AA direction.

[0026] Figure 6 for Figure 5 A schematic diagram after the connecting screws have been removed.

[0027] Figure 7 This is a schematic diagram of the cutter head structure at another angle in a sleeve-type straight groove reamer.

[0028] Figure 8 This is a schematic diagram of the cutter head structure at another angle in a sleeve-type straight groove reamer.

[0029] Figure 9 for Figure 8 A magnified view of a portion of point a. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0031] Please see Figure 1-9A sleeve-type straight groove reamer includes a cutter head 1 and a handle 2, which are movably connected. The cutter head 1 has an integrally formed insertion post 3 at its upper top. A countersunk hole 4 is formed along the axial direction at the center of the cutter head 1, with the top of the countersunk hole 4 passing through the insertion post 3. A limiting groove 5 is vertically formed on the top end face of the insertion post 3. The lower end of the handle 2 has an insertion hole 6, with a limiting block 7 positioned at the top of the inner cavity of the insertion hole 6. The limiting block 7 is inserted into the limiting groove 5. The cooperation between the limiting block 7 and the limiting groove 5 prevents the cutter head 1 from... Rotation occurs between the tool holder 2 and the tool disc 1; the limiting block 7 and the limiting groove 5 are clearance fit, and the width of the limiting block 7 is 16±0.5mm; this utility model uses the limiting block 7 and the limiting groove 5 integrally formed on the tool disc 1 and the tool holder 2 to prevent rotation between them; compared with the prior art, which uses a single fastener (usually a screw) to prevent rotation, the limiting block 7 of this utility model has a width of 16±0.5mm, and two sets of limiting blocks 7 and limiting grooves 5 are provided, resulting in higher structural strength and a lower risk of breakage when subjected to loads in the rotational direction. Installation stability is also higher.

[0032] The top of the inner cavity of the insertion hole 6 is also provided with a vertically upward connecting threaded hole 13; the cutter head 1 and the cutter handle 2 are also connected by a connecting screw 8. Specifically, the connecting screw 8 is a countersunk screw. The connecting screw 8 first passes through the connecting countersunk hole 4 and then is threaded into the connecting threaded hole 13; the connecting screw 8 is mainly used to fix the cutter head 1 and the cutter handle 2 in the axial direction.

[0033] The lower sidewall of the cutter head 1 is provided with a plurality of blade mounting seats 9 in a ring array. In this scheme, there are a total of eight blade mounting seats 9. One side of the blade mounting seat 9 is a blade mounting surface 10. A blade 11 is mounted on the lower outer side of the blade mounting surface 10. In this scheme, the blade 11 is welded and fixed to the blade mounting surface 10.

[0034] In this solution, the lower outer end of the blade 11 is provided with an R-corner portion 12, which facilitates reaming and forming the R-corner when the reamer enters the machined circular hole. This not only reduces the problem of increased overall processing time due to the need to change tools, but also reduces the problem of the existing tool marks being relatively troublesome to handle.

[0035] like Figure 9 As shown, in this scheme, the R-corner 12 extends beyond the bottom of the blade 11, and the bottom of the blade 11 is flush with the end face of the lower end of the cutter head 1, that is, the lower end of the R-corner 12 extends out of the end face of the lower end of the cutter head 1.

[0036] In this design, the included angle between the side wall of the cutter head 1 and the insert mounting surface 10 forms a chip removal groove 13. This vertically positioned groove allows chips to be directly discharged along the tool axis, resulting in low chip removal resistance. This effectively prevents tool wear and hole wall scratches caused by chip accumulation during deep hole machining or continuous reaming.

[0037] In this design, the cutter head 1 can be made of 42CrMo tool steel, and the cutting tool 11 can be made of HRA89-93 cemented carbide.

[0038] When installing this utility model, first insert the plug 3 of the cutter head 1 into the plug 3 of the cutter handle 2, and at the same time align the limiting block 7 and the limiting groove 5 to prevent rotation between them. Then, insert the connecting screw 8 through the connecting countersunk hole 4 to make it threadedly connected to the connecting threaded hole 13, and fix the cutter head 1 and the cutter handle 2 together.

[0039] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connect" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A sleeve-type straight flute reamer, comprising a cutter head and a cutter shank, characterized in that, The cutter head and the cutter handle are movably connected; the upper top of the cutter head is integrally formed with a plug-in post, and a countersunk hole is opened along the axis of the cutter head. The top of the countersunk hole passes through the plug-in post, and a limit groove is vertically opened on the top end face of the plug-in post; the lower end of the cutter handle is provided with a plug-in hole, and a limit block is provided at the top of the inner cavity of the plug-in hole. The limit block is inserted into the limit groove; a threaded hole is also vertically opened at the top of the inner cavity of the plug-in hole; the cutter head and the cutter handle are also connected by a connecting screw. The connecting screw is a countersunk screw, which passes through the countersunk hole and then is threaded into the threaded hole; a number of blade mounting seats are arranged in a ring array on the lower side wall of the cutter head. One side of the blade mounting seat is a blade mounting surface, and a blade is installed on the lower outer side of the blade mounting surface.

2. A sleeve-type straight groove reamer according to claim 1, characterized in that, The limiting block and the limiting groove are clearance fit.

3. A sleeve-type straight groove reamer according to claim 2, characterized in that, The width of the limiting block is 16±0.5mm.

4. A sleeve-type straight groove reamer according to claim 1, characterized in that, There are a total of eight blade mounting bases.

5. A sleeve-type straight groove reamer according to claim 1, characterized in that, The blade is welded and fixed to the blade mounting surface.

6. A sleeve-type straight groove reamer according to claim 1, characterized in that, The outer lower end of the blade is provided with a radius (R-angle).

7. A sleeve-type straight groove reamer according to claim 6, characterized in that, The R-corner extends beyond the bottom of the blade, and the bottom of the blade is flush with the lower end face of the cutter head, that is, the lower end of the R-corner extends beyond the lower end face of the cutter head.

8. A sleeve-type straight groove reamer according to claim 1, characterized in that, The included angle between the side wall of the cutter head and the blade mounting surface is a chip removal groove, which is vertically arranged.

Images