Reamer with replaceable reamer insert

Abstract

The utility model belongs to the technical field of machining tool belongs to, disclose a reamer piece convenient to replace's reamer, including the tool bar, the tool bar has the assembly section of integrated mould, and the assembly section is the conical platform structure, and the one end of assembly section is equipped with the threaded hole, the reamer piece has the conical platform groove corresponding with the assembly section on the reamer piece, and the conical platform groove is adapted to the assembly section, and the taper is in accord with, and the one end of the pressing cylinder sleeve joint installation is in the one end of assembly section, and the one end of pressing cylinder and the one end of reamer piece press contact, locking screw, locking screw and threaded hole thread cooperation connection, locking screw installs on the tool bar through threaded hole, and presses the other end of locking pressing cylinder, and the assembly section is installed with assembly convex edge, and assembly convex edge has the positioning boss on. The utility model through adopting the cooperation of taper and single locking screw, can realize the simplification replacement step, to shorten the replacement time -consuming and promote the replacement efficiency, and the tool bar can be reused simultaneously, to reduce material waste.

Description

Technical Field

[0001] This utility model relates to the field of machining tool technology, and in particular to a reamer with easily replaceable reamer inserts. Background Technology

[0002] Reamers are key tools for hole finishing and are widely used in mechanical manufacturing, mold making and other fields. Indexable reamers are favored because of their replaceable inserts and high cost-effectiveness. However, existing indexable reamers still have many inconveniences in terms of insert replacement.

[0003] Currently, the blade replacement efficiency and positioning accuracy of reamers directly affect production efficiency and processing quality. Traditional reamers mostly adopt welded or integral structures, which have the following problems: 1) High replacement cost: After the blade wears out, the entire tool holder needs to be replaced, resulting in serious material waste; 2) Cumbersome operation: Existing replaceable blade reamers rely on multiple screws for locking or complex clamping mechanisms, which are time-consuming to disassemble and are prone to blade deflection due to uneven force. 3) Insufficient positioning accuracy: Ordinary threaded connections or planar mating structures are prone to micro-displacement during high-speed cutting, which affects the hole diameter tolerance. Therefore, we propose a reamer with easily replaceable reamer inserts. Utility Model Content

[0004] In view of the problems of high replacement cost, cumbersome operation and insufficient positioning accuracy of the blades of the existing reamers, this utility model is proposed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A reamer with easily replaceable reamer blades includes a shank, the shank having an integrally formed assembly section, the assembly section being a tapered truncated cone structure, and a threaded hole being provided at one end of the assembly section; A reamer blade having a truncated cone groove corresponding to the assembly section, the truncated cone groove being adapted to the assembly section and having a matching taper; A pressure cylinder is sleeved and installed on one end of the assembly section, and one end of the pressure cylinder is in abutting contact with one end of the reamer blade; A locking screw is threadedly connected to the threaded hole. The locking screw is installed on the tool holder through the threaded hole and presses against and locks the other end of the pressure cylinder.

[0006] As a technical solution for a reamer blade that is easy to replace according to the present utility model, wherein: an assembly flange is installed on the assembly section, and the assembly flange has a positioning protrusion that is integrally formed and arranged in a circular array; the end of the reamer blade away from the pressure cylinder is provided with a positioning hole corresponding to the positioning protrusion, and the positioning hole is adapted to the positioning protrusion.

[0007] As a technical solution for a reamer blade that is easy to replace according to the present utility model, wherein: both ends of the pressure cylinder have integrally formed pressure flanges, one end of the pressure flange is in pressure contact with one end of the reamer blade, and the other end of the pressure flange is in pressure contact with the locking screw.

[0008] As a technical solution for a reamer blade that is easy to replace according to the present utility model, wherein: the head of the locking screw is one of the following: internal Torx hole, slotted slot, cross slot, internal hexagonal hole or external hexagonal head.

[0009] As a technical solution of the present invention for a reamer with easily replaceable reamer blades, wherein the tail of the shank is a standard shank structure.

[0010] Compared with the prior art, the present invention has at least the following beneficial effects: 1. This utility model, by adopting a tapered fit and a single locking screw, simplifies the replacement steps, thereby shortening the replacement time and improving the replacement efficiency. At the same time, the tool holder can be reused to reduce material waste.

[0011] 2. This utility model adopts a dual design of tapered self-centering and anti-rotation protrusion to ensure the circumferential and radial errors of the cutting tool, while the hole diameter machining tolerance is stably controlled at IT7 level, so as to solve the micro-displacement problem in high-speed cutting.

[0012] 3. This utility model extends the service life of the cutting tool by using a pressure-relief flange to disperse stress and a standardized interface structure. At the same time, the standard tool holder structure is compatible with the mainstream tool holder systems of BT and HSK, so as to be compatible with most CNC equipment and enhance versatility. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the main structure of this utility model.

[0014] Figure 2This is a schematic diagram of the exploded main view structure of this utility model.

[0015] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0016] Figure 4 This is a side view diagram of the exploded structure of this utility model.

[0017] Explanation of reference numerals in the attached figures: In the diagram: 1. Tool holder; 101. Assembly section; 102. Assembly flange; 103. Positioning protrusion; 104. Threaded hole; 105. Standard tool holder structure; 2. Reamer insert; 201. Conical groove; 202. Positioning hole; 3. Pressing cylinder; 301. Pressing flange; 4. Locking screw. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] Reference Figures 1-4 A reamer with easily replaceable reamer inserts is provided. This reamer includes a shank 1, which is made of 0CrMnTi alloy steel and surface carburized and quenched to HRC58-62. The shank 1 has an integrally formed assembly section 101, which is a frustum-shaped structure with a taper (Mohs taper, such as MT3, with a surface roughness Ra≤0.4μm). One end of the assembly section 101 is provided with a threaded hole 104. The reamer blade 2 is made of cemented carbide with a TiAlN coating on the cutting edge, which is 3-5 μm thick. The reamer blade 2 has a truncated cone groove 201 that corresponds to the assembly section 101. The truncated cone groove 201 is adapted to the assembly section 101 and the taper is matched. The pressure cylinder 3 is made of 304 stainless steel. The pressure cylinder 3 is sleeved and installed on one end of the assembly section 101, and one end of the pressure cylinder 3 is in abutting contact with one end of the reamer blade 2. Locking screw 4 is threadedly connected to threaded hole 104. Locking screw 4 is installed on tool holder 1 through threaded hole 104 and presses against the other end of locking and pressing cylinder 3. In application, assembly section 101 and the conical groove 201 of reamer 2 are tapered to achieve automatic centering, eliminate radial deviation, and ensure the coaxiality of the blade installation to improve accuracy. Combined with the conical surface to disperse cutting force, it avoids micro-displacement of the blade caused by local stress concentration, thereby enhancing stability. At the same time, only a single locking screw 4 is needed to press the pressing cylinder 3, simplifying the locking steps, shortening replacement time and improving replacement efficiency.

[0020] Reference Figure 2 and Figure 4 The assembly section 101 is equipped with an assembly flange 102, and the assembly flange 102 has integrally formed positioning protrusions 103 arranged in a circumferential array. The end of the reamer 2 away from the pressure cylinder 3 is provided with positioning holes 202 corresponding to the positioning protrusions 103, and the positioning holes 202 are adapted to the positioning protrusions 103. In application, the circumferential array of positioning protrusions 103 and positioning holes 202 cooperates to prevent the reamer 2 from rotating and shifting, and improves the repeatability of positioning accuracy. At the same time, the assembly flange 102 increases the contact area, resists cutting torque, and reduces vibration in high-speed machining, so as to improve machining quality.

[0021] Reference Figure 2 and Figure 3 Both ends of the pressure cylinder 3 have integrally formed pressure flanges 301. One end of the pressure flange 301 is in pressure contact with one end of the reamer blade 2, and the other end of the pressure flange 301 is in pressure contact with the locking screw 4. In application, the pressure flanges 301 at both ends of the pressure cylinder 3 transmit the clamping force of the locking screw 4 and the reaction force of the reamer blade 2 respectively, avoiding direct pressure on the blade and causing deformation, so as to extend the service life. At the same time, the structure of the pressure flange 301 disperses the contact stress, protecting the end face of the reamer blade 2 from crushing damage, thereby reducing maintenance costs.

[0022] Reference Figure 2 and Figure 3 The head of the locking screw 4 is one of the following: internal Torx head, slotted head, cross head, internal hex head, or external hex head, such as an M8×1.25 internal hex screw with a strength grade of 12.9 and a blackened surface finish. In application, the locking screw 4 supports a variety of common screw head types (such as internal hex and Torx heads), is compatible with existing wrench tools, reduces reliance on special tools, and improves ease of operation.

[0023] Reference Figure 1 , Figure 2 as well as Figure 4 The tail of the tool holder 1 is a standard tool holder structure 105. In application, the tail standard tool holder structure 105 is compatible with CNC machine tool / machining center tool magazines without the need for an adapter, thus enhancing versatility.

[0024] The working principle of this utility model is as follows: Disassembly process: First, use the matching wrench to rotate the locking screw 4 counterclockwise to release the axial pressure. Then, gently tap the side of the pressure cylinder 3 to make it slide out along the axial direction of the knife bar 1. Finally, hold both sides of the reamer blade 2 and pull it out smoothly along the axis of the conical surface. Side prying is prohibited. Installation procedure: First, wipe the conical surface of the tool holder 1, the positioning protrusion 103, and the truncated cone groove 201 inside the new reamer 2 with anhydrous ethanol, and confirm that there are no chips or oil stains. Then, align the truncated cone groove 201 of the new reamer 2 with the conical surface of the tool holder 1, rotate it circumferentially until the positioning hole 202 is roughly aligned with the positioning protrusion 103, and apply a uniform force axially to push the reamer 2 in until the positioning protrusion 103 is inserted into the positioning hole 202, and confirm that there is no looseness circumferentially. Finally, put back the pressure sleeve 3 so that its front end pressure flange 301 is in complete contact with the end face of the reamer 2, and tighten the locking screw twice with an appropriate wrench (first 10 N·m pre-tighten, then 15 N·m final tighten) to ensure that the interference fit of the conical surface is up to standard.

[0025] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A reamer with easily replaceable blades, characterized in that: include: The tool holder (1) has an integrally formed assembly section (101), and the assembly section (101) is a tapered truncated cone structure. One end of the assembly section (101) is provided with a threaded hole (104). A reamer blade (2) has a frustum groove (201) corresponding to the assembly section (101), the frustum groove (201) is adapted to the assembly section (101) and the taper fits; A pressure cylinder (3) is sleeved and installed on one end of the assembly section (101), and one end of the pressure cylinder (3) is in abutting contact with one end of the reamer blade (2); The locking screw (4) is threadedly connected to the threaded hole (104). The locking screw (4) is installed on the knife bar (1) through the threaded hole (104) and presses against and locks the other end of the pressure cylinder (3).

2. The reamer with easily replaceable blades according to claim 1, characterized in that: The assembly section (101) is equipped with an assembly flange (102), and the assembly flange (102) has a positioning protrusion (103) integrally formed and arranged in a circular array. The end of the reamer blade (2) away from the pressure cylinder (3) is provided with a positioning hole (202) corresponding to the positioning protrusion (103), and the positioning hole (202) is adapted to the positioning protrusion (103).

3. The reamer with easily replaceable blades according to claim 1, characterized in that: Both ends of the pressure cylinder (3) have integrally formed pressure flanges (301). One end of the pressure flange (301) is in pressure contact with one end of the reamer blade (2), and the other end of the pressure flange (301) is in pressure contact with the locking screw (4).

4. The reamer with easily replaceable blades according to claim 1, characterized in that: The head of the locking screw (4) is one of the following: internal Torx hole, slotted slot, cross slot, internal hexagonal hole, or external hexagonal head.

5. The reamer with easily replaceable reamer blades according to any one of claims 1-4, characterized in that: The tail of the tool holder (1) is a standard tool holder structure (105).

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