Reamer assembly with adjustable cutter head

Abstract

According to the reamer assembly with the adjustable cutter head, a first conical surface sliding pair formed by the second conical surface on the inner wall of the cutter head and the fourth conical surface on the shaft shoulder of the small-diameter section of the cutter bar is matched with the axial locking force of the locking screw, so that the cutter bar can apply radial expansion force to the inner wall of the small-diameter hole of the cutter head, and the outer diameter of the cutter head is accurately adjusted; the adaptability of the reamer for processing different apertures is improved; furthermore, through a second conical surface sliding pair formed by the third conical surface of the pressing block and the first conical surface of the inner wall of the large-diameter hole of the cutter head, the pressing block can synchronously apply radial expansion force to the inner wall of the large-diameter hole of the cutter head under the axial pressing action of the locking nut, a two-way adjusting mechanism is formed, the concentricity and connection stability of the cutter head and the cutter bar are enhanced, and the machining precision is improved. The problem of stress concentration caused by traditional single-point locking is avoided, and the service life of the cutter is prolonged; the adjustment process is more stable and reliable through the optimal design that the stepped hole is matched with the conical surface.

Description

Technical Field

[0001] This utility model relates to the field of machining, and more specifically, to a reamer assembly with an adjustable cutter head. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this utility model and does not constitute prior art.

[0003] In the field of machining, reamers are widely used tools for precision hole machining, and their machining quality directly affects the dimensional accuracy and surface roughness of the workpiece. Traditional reamers typically employ a fixed-diameter cutter head structure, with the cutter head and tool holder fixed by screws or keyways, resulting in a limited adjustment range. When machining workpieces with different hole diameters, it is often necessary to change to reamers of different specifications, which not only increases tooling costs but also reduces machining efficiency.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a reamer assembly with an adjustable cutter head.

[0006] To address the aforementioned technical problems, this utility model provides a reamer assembly with an adjustable cutter head, comprising: a cutter bar, which is a stepped shaft structure divided axially into a lower large-diameter section and an upper small-diameter section; a cutter head, fitted onto a shoulder near the large-diameter section, wherein the inner wall of the cutter head has a second conical surface, and the shoulder of the small-diameter section has a fourth conical surface with a taper matching the second conical surface, the second and fourth conical surfaces forming a first conical sliding pair; the reamer assembly further includes multiple locking screws, which pass axially through the cutter head. During the screwing process into the cutter bar, the second and fourth conical surfaces press against each other, and the cutter bar applies a radial expansion force to the inner wall of the small-diameter hole of the cutter head to expand the outer diameter of the cutter head.

[0007] Preferably, the reamer assembly further includes a pressure block, which is an annular structure, sleeved on the small-diameter section and disposed within the large-diameter hole of the cutter head; a locking nut, sleeved on the end of the small-diameter section and threadedly engaged with the small-diameter section, for axially pressing the pressure block; the cutter head is provided with stepped holes along the axial direction, the stepped holes including a large-diameter hole in the upper section and a small-diameter hole in the lower section, the inner wall of the large-diameter hole being a first conical surface with a taper direction that is larger at the top and smaller at the bottom, and the inner wall of the small-diameter hole being a second conical surface. Its taper direction is smaller at the top and larger at the bottom. The upper end face of the small diameter hole is a stepped surface. The pressure block presses the stepped surface axially. The outer wall of the pressure block is a third tapered surface, and its taper matches the first tapered surface. The first tapered surface and the third tapered surface form a second tapered sliding pair. When the locking nut is turned downward axially, the lower end face of the nut pushes the pressure block to move axially along the small diameter section. The third tapered surface of the pressure block slides relative to the first tapered surface of the cutter head. The pressure block applies a radial expansion force to the inner wall of the large diameter hole of the cutter head.

[0008] Preferably, a cutting head is further installed at the head of the small-diameter section of the cutter bar, and the diameter of the cutting head is smaller than the diameter of the cutter disc.

[0009] Preferably, the end of the large-diameter section and the cutter head are provided with multiple pairs of mating pin holes, and positioning pins are installed in the mating pin holes to prevent relative sliding between the cutter head and the cutter bar during rotation.

[0010] Preferably, there are four locking screws, evenly arranged circumferentially.

[0011] Preferably, the tool holder is provided with multiple cooling water channels.

[0012] Based on the above technical solution, the beneficial effects of this utility model are as follows:

[0013] This utility model discloses an adjustable reamer assembly. Through a first conical sliding pair formed by the second conical surface of the inner wall of the cutter head and the fourth conical surface at the shoulder of the small-diameter section of the tool holder, combined with the axial locking force of the locking screw, the tool holder can apply a radial expansion force to the inner wall of the small-diameter hole of the cutter head, thereby achieving precise adjustment of the outer diameter of the cutter head and improving the adaptability of the reamer to machining different hole diameters. Furthermore, through a second conical sliding pair formed by the third conical surface of the pressure block and the first conical surface of the inner wall of the large-diameter hole of the cutter head, under the axial pressing action of the locking nut, the pressure block can simultaneously apply a radial expansion force to the inner wall of the large-diameter hole of the cutter head, forming a bidirectional adjustment mechanism. This not only enhances the concentricity and connection stability of the cutter head and the tool holder but also avoids the stress concentration problem caused by traditional single-point locking, extending the tool's service life. The optimized design of the stepped hole and conical surface fit makes the adjustment process more stable and reliable, while simplifying the assembly process and improving the adjustment accuracy and machining efficiency of the reamer assembly, making it suitable for high-precision hole machining scenarios. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of the reamer assembly of this utility model.

[0015] Figure 2 This is a cross-sectional structural diagram of the reamer assembly of this utility model.

[0016] Figure 3 yes Figure 2 A magnified view of part A in the middle.

[0017] Figure 4 This is a schematic diagram of the cutter head structure of this utility model.

[0018] Figure 5 This is a cross-sectional structural diagram of the cutter head of this utility model.

[0019] Figure 6 This is a structural schematic diagram of the locking nut and pressure block of this utility model.

[0020] Figure 7 This is a cross-sectional structural diagram of the locking nut and pressure block of this utility model.

[0021] Figure 8 This is a schematic diagram of the tool holder structure of this utility model.

[0022] The components are: 1. Tool holder; 2. Tool disc; 3. Locking nut; 4. Pressure block; 5. Tool head; 6. Locking screw; 21. First conical surface; 22. Second conical surface; 23. Stepped surface; 24. Locking screw hole; 41. Third conical surface; 11. Fourth conical surface; 12. Small diameter section; 13. Large diameter section. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] This utility model provides an adjustable reamer assembly with a cutter head 2, including a cutter bar 1, which is a stepped shaft structure, divided axially into a large-diameter section 13 at the lower end and a small-diameter section 12 at the upper end; a cutter head 2, which is sleeved near the shoulder of the large-diameter section 13, the inner wall of the cutter head 2 having a second conical surface 22, and the shoulder of the small-diameter section 12 having a fourth conical surface 11, the taper of which matches the second conical surface 22, the second conical surface 22 and the fourth conical surface 11 forming a first conical surface 21 sliding pair; the reamer assembly also includes a plurality of locking screws 6, which pass through the cutter head 2 axially. During the process of screwing the locking screws 6 into the cutter bar 1, the second conical surface 22 and the fourth conical surface 11 press against each other, and the cutter bar 1 applies a radial expansion force to the inner wall of the small-diameter hole of the cutter head 2 to expand the outer diameter of the cutter head 2. The reamer assembly further includes a pressure block 4, which is an annular structure, sleeved on the small-diameter section 12 and located within the large-diameter hole of the cutter head 2; and a locking nut 3, sleeved at the end of the small-diameter section 12 and threadedly engaged with it, for axially pressing the pressure block 4. The cutter head 2 has stepped holes along its axial direction, including a large-diameter hole in the upper section and a small-diameter hole in the lower section. The inner wall of the large-diameter hole is a first conical surface 21, with a taper direction that is larger at the top and smaller at the bottom. The inner wall of the small-diameter hole is a second conical surface 22, with a taper direction that is smaller at the top and smaller at the bottom. The upper surface of the small-diameter hole is a stepped surface 23. The pressure block 4 presses the stepped surface 23 axially. The outer wall of the pressure block 4 is a third conical surface 41, whose taper matches the first conical surface 21. The first conical surface 21 and the third conical surface 41 form a sliding pair of second conical surfaces 22. When the locking nut 3 is turned downward axially, the lower end surface of the nut pushes the pressure block 4 to move axially along the small-diameter section 12. The third conical surface 41 of the pressure block 4 slides relative to the first conical surface 21 of the cutter head 2. The pressure block 4 applies a radial expansion force to the inner wall of the large-diameter hole of the cutter head 2. There are four locking screws 6, which are evenly arranged circumferentially. The cutter bar 1 is provided with multiple cooling water channels. In a preferred embodiment, the end of the large-diameter section 13 and the cutter head 2 are provided with multiple pairs of mating pin holes. Locating pins are installed in the mating pin holes to prevent relative sliding between the cutter head 2 and the cutter bar 1 during rotation.

[0026] The head of the small-diameter section 12 of the tool holder 1 is also equipped with a cutting head 5, the diameter of which is smaller than the diameter of the cutter disc 2. The cutting head 5 and the cutter disc 2 cooperate with each other to process stepped holes.

[0027] This utility model discloses an adjustable reamer assembly with a cutter head 2. Through a sliding pair formed by the second conical surface 22 of the inner wall of the cutter head 2 and the fourth conical surface 11 at the shoulder of the small-diameter section 12 of the tool holder 1, and in conjunction with the axial locking force of the locking screw 6, the tool holder 1 can apply a radial expansion force to the inner wall of the small-diameter hole of the cutter head 2, thereby achieving precise adjustment of the outer diameter of the cutter head 2 and improving the adaptability of the reamer to machining different hole diameters. Furthermore, through the second conical surface 41 of the pressure block 4 and the first conical surface 21 of the inner wall of the large-diameter hole of the cutter head 2, a second conical surface is formed... The sliding pair 22, under the axial clamping action of the locking nut 3, allows the pressure block 4 to simultaneously apply radial expansion force to the inner wall of the large-diameter hole of the cutter head 2, forming a bidirectional adjustment mechanism. This not only enhances the concentricity and connection stability of the cutter head 2 and the tool holder 1, but also avoids the stress concentration problem caused by traditional single-point locking, extending the tool life. The optimized design of the stepped hole and conical surface makes the adjustment process more stable and reliable, while simplifying the assembly process and improving the adjustment accuracy and processing efficiency of the reamer assembly, making it suitable for high-precision hole machining scenarios.

[0028] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A cutter head adjustable reamer assembly comprising, The application relates to a reamer assembly. The cutter bar is a stepped shaft structure and is divided into a large-diameter section at the lower end and a small-diameter section at the upper end in the axial direction. The cutter head is sleeved on the shaft shoulder close to the large-diameter section, and the inner wall of the cutter head is provided with a second taper surface. The shaft shoulder of the small-diameter section is provided with a fourth taper surface which matches the second taper surface, and the second taper surface and the fourth taper surface form a first taper sliding pair. The reamer assembly further comprises a plurality of locking screws which pass through the cutter head in the axial direction and are screwed into the cutter bar.

2. The reamer assembly of claim 1, wherein, The reamer assembly further comprises a pressing block which is annular, is sleeved on the small-diameter section and is arranged in the large-diameter hole of the cutter head. A locking nut is sleeved on the end of the small-diameter section and is in threaded cooperation with the small-diameter section, and is used for axially pressing the pressing block. The cutter head is provided with a stepped hole in the axial direction, and the stepped hole comprises a large-diameter hole at the upper section and a small-diameter hole at the lower section. The inner wall of the large-diameter hole is a first taper surface which has a taper direction of large at the upper end and small at the lower end. The inner wall of the small-diameter hole is the second taper surface which has a taper direction of small at the upper end and large at the lower end. The upper end surface of the small-diameter hole is a stepped surface. The outer wall of the pressing block is a third taper surface which matches the first taper surface, and the first taper surface and the third taper surface form a second taper sliding pair.

3. The reamer assembly of claim 1, wherein, When the locking nut is screwed downward in the axial direction, the lower end surface of the locking nut pushes the pressing block to move along the small-diameter section in the axial direction, the third taper surface of the pressing block and the first taper surface of the cutter head slide relative to each other, and the pressing block applies a radial expansion force to the inner wall of the large-diameter hole of the cutter head.

4. The reamer assembly of claim 1, wherein, The head of the small-diameter section of the cutter bar is further provided with a cutter head which has a diameter smaller than that of the cutter head.

5. The reamer assembly of claim 1, wherein, The end of the large-diameter section and the cutter head are provided with a plurality of pairs of matched pin holes, and a positioning pin is arranged in the matched pin holes to prevent the cutter head and the cutter bar from sliding relative to each other when rotating.

6. The reamer assembly of claim 1, wherein, The locking screws are four and are uniformly arranged in the circumferential direction. The cutter bar is provided with a plurality of cooling water channels.

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