Boring cutter with large boring amount

Abstract

The utility model discloses a boring cutter with large boring amount, which comprises a cutter holder and a boring cutter body, and a cutter handle with Morse taper is coaxially and fixedly arranged at the rear end of the boring cutter body; the tool clamps are arranged at the front end of the boring tool body, the number of the tool clamps is at least two, the tool clamps are symmetrically arranged relative to the center of the boring tool body, a slope sliding connection mechanism is arranged between the rear ends of the tool clamps and the front end of the boring tool body in a matched mode, and the slope of the slope sliding connection mechanism is obliquely arranged in the front-back direction. A blade mounting seat is arranged at the front outer side end of the cutter holder, a blade is detachably mounted on the blade mounting seat, and a cutter holder positioning and locking mechanism is further arranged between the cutter holder and the boring cutter body. According to the boring cutter with the large boring amount, the larger boring amount can be achieved in the one-time feeding boring process, meanwhile, the stepped boring function can be achieved, and the boring cutter is particularly suitable for the rough boring procedure with the large machining allowance.

Description

Technical Field

[0001] The utility model relates to a boring tool for boring holes, in particular to a boring tool with a large boring amount which can improve the boring processing efficiency in a single feeding boring process and belongs to the technical field of mechanical processing. Background Art

[0002] Boring is an internal diameter cutting process that uses a boring tool to expand the prefabricated hole or other circular contour on the workpiece to a certain size to achieve the required inner hole accuracy and surface roughness. Its application range generally ranges from semi-roughing to finishing and is widely used in the field of mechanical processing. At present, the traditional boring tool structure with welded carbide blades has been replaced by a boring tool structure that can disassemble and replace carbide blades on the tool holder.

[0003] Boring cutters can be divided into single-edge boring cutters, double-edge boring cutters and multi-edge boring cutters according to the number of cutting edges. Double-edge boring cutters or multi-edge boring cutters have two or more teeth that can cut simultaneously and are distributed relative to the center of the boring cutter body. Since the radial forces generated during cutting can be balanced with each other, the cutting amount can be increased and the production efficiency is high. The tool holders of traditional double-edge boring cutters and multi-edge boring cutters are usually evenly distributed along the circumferential direction of the boring cutter body and located on the same circumferential reference plane, that is, multiple teeth are cut synchronously during the boring process, which results in that even if each tooth is bored at the maximum feed rate during one feed boring process, the boring amount is limited. For rough boring with large machining allowances, even if boring is done at the maximum feed rate, multiple feed boring processes are often required. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the utility model provides a boring cutter with a large boring amount, which can achieve a larger boring amount in a single feeding boring process and can also realize a step boring function, and is particularly suitable for rough boring processes with large machining allowances.

[0005] In order to achieve the above-mentioned purpose, the boring tool with a large boring amount comprises a tool holder and a boring tool body, and a tool handle is coaxially fixed at the rear end of the boring tool body;

[0006] The tool clamp is arranged at the front end of the boring tool body, and the tool clamp is symmetrically arranged in at least two pieces relative to the center of the boring tool body. A matching inclined sliding connection mechanism is arranged between the rear end of the tool clamp and the front end of the boring tool body, and the inclined surface of the inclined sliding connection mechanism is inclined along the front and rear directions. A blade mounting seat is arranged at the front outer end of the tool clamp, and a blade is detachably mounted on the blade mounting seat. A tool clamp positioning and locking mechanism is also arranged between the tool clamp and the boring tool body.

[0007] As a further improvement of the present invention, the rear end of the inclined surface of the inclined surface sliding connection mechanism is arranged corresponding to the blade mounting seat of the tool holder.

[0008] As an embodiment of the utility model, the tool clamp positioning and locking mechanism includes an oblong mounting hole arranged on the tool clamp, a locking screw cooperating with the oblong mounting hole, and a threaded mounting hole corresponding to the locking screw and located in the boring tool body. The oblong mounting hole on the tool clamp penetrates the tool clamp in the front-to-back direction, and the direction of the oblong mounting hole corresponds to the inclined direction of the inclined sliding connection mechanism, and the axial direction of the locking screw is arranged along the axial direction of the boring tool body.

[0009] As a further improvement of the present invention, a directional sliding structure is provided between the two inclined surfaces of the inclined surface sliding connection mechanism.

[0010] As a further improvement of the utility model, a sliding reference line and a sliding scale are correspondingly provided between the tool holder and the boring tool body.

[0011] Compared with the prior art, when the boring tool with a large boring amount is used to bore a stepped hole, one tool clamp can be adjusted to extend outwardly along the radial direction of the boring tool body through the inclined sliding connection mechanism to an extended position of the set boring amount, and is positioned and locked by the tool clamp positioning and locking mechanism. Then, on the basis of the set boring amount, another tool clamp is adjusted to extend outwardly along the radial direction of the boring tool body through the inclined sliding connection mechanism to an extended position greater than the set boring amount, and is positioned and locked by the tool clamp positioning and locking mechanism, thereby achieving boring with a larger boring amount in a single feed boring process; the step boring function can be achieved by controlling the different extension amounts of the tool clamp to extend outwardly along the radial direction of the boring tool body; and when the tool clamp is controlled to extend outwardly along the radial direction of the boring tool body to the same size, it can be used as an ordinary double-edged boring tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 The utility model is a schematic diagram of the structure when boring a hole, wherein (a) is a schematic diagram of the structure when the blade of the tool holder corresponding to the set boring amount contacts the workpiece to be processed first during the boring process, (b) is a schematic diagram of the structure when the blade of the tool holder corresponding to twice the set boring amount contacts the workpiece to be processed immediately after the set boring amount, and (c) is a schematic diagram of the structure of the stepped hole formed after boring to the set depth and retracting the tool.

[0014] In the figure: 1. tool holder, 2. blade, 3. boring tool body, 4. tool handle. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings (hereinafter referred to as Figure 1The left side direction is described as the front, the direction close to the axis center line of the boring tool body 3 is described as the inner direction, and the direction away from the axis center line of the boring tool body 3 is described as the outer direction).

[0016] like Figure 1 As shown, the boring tool with a large boring amount includes a tool holder 1 and a boring tool body 3. The tool holder 1 is arranged at the front end of the boring tool body 3, and a tool handle 4 is coaxially fixed at the rear end of the boring tool body 3. The tool handle 4 is a columnar structure or a Morse taper structure that is convenient for positioning and clamping with a boring bar.

[0017] The tool holder 1 is symmetrically arranged in at least two parts relative to the center of the boring tool body 3. A matching inclined sliding connection mechanism is provided between the rear end of the tool holder 1 and the front end of the boring tool body 3, and the inclined surface of the inclined sliding connection mechanism is inclined along the front-to-back direction. The tool holder 1 can slide in the radial inward and outward directions relative to the boring tool body 3 along the inclined surface of the inclined sliding connection mechanism. A blade mounting seat is provided at the front outer end of the tool holder 1, and a blade 2 is detachably mounted on the blade mounting seat. A tool holder positioning and locking mechanism is also provided between the tool holder 1 and the boring tool body 3, and the tool holder 1 can be positioned and locked on the boring tool body 3 through the tool holder positioning and locking mechanism.

[0018] Taking the case where the tool holder 1 is symmetrically arranged in two pieces relative to the center of the boring tool body 3 (i.e., a double-edged boring tool) as an example, when the boring tool with a large boring amount is used for rough boring, one tool holder 1 can be adjusted to extend outward along the radial direction of the boring tool body 3 to the extended position corresponding to the set boring amount through the inclined sliding connection mechanism, and is positioned and locked through the tool holder positioning and locking mechanism. Then, based on the boring amount, the other tool holder 1 is adjusted to extend outward along the radial direction of the boring tool body 3 through the inclined sliding connection mechanism. It extends outward to the extended position corresponding to 2 times the set boring amount, and is positioned and locked by the tool holder positioning and locking mechanism. Since the rear end of the tool holder 1 is connected with the front end of the boring tool body 3 through the inclined sliding connection mechanism, and the two tool holders 1 extend outward in the radial direction of the boring tool body 3 at different sizes, there is a small gap between the blades 2 of the two tool holders 1 in the front and rear directions. The blade 2 of the tool holder 1 corresponding to the set boring amount is in front, and the blade 2 of the tool holder 1 corresponding to 2 times the set boring amount is in the back, as shown in FIG. Figure 2 As shown in (a), during the boring process, the blade 2 of the tool holder 1 corresponding to the set boring amount first contacts the workpiece to be processed. Figure 2As shown in (b), the blade 2 of the tool holder 1 corresponding to 2 times the set boring amount contacts the workpiece to be processed immediately afterwards. Although the tool holder 1 corresponding to the set boring amount and the tool holder 1 corresponding to 2 times the set boring amount are both single-edged cutting during the boring process, after the blade 2 of the tool holder 1 corresponding to 2 times the set boring amount contacts the workpiece to be processed, the cutting radial forces can offset each other during the boring process, which can greatly reduce the probability of tool letting go and tool chattering, and at the same time achieve boring of 2 times the set boring amount in a single feed boring process. Similarly, when machining a stepped hole, one tool holder 1 can be adjusted so that it can extend outward along the radial direction of the boring tool body 3 through the inclined sliding connection mechanism to a set position that meets the requirements of the radius size of the stepped inner hole, and is positioned and locked through the tool holder positioning and locking mechanism. Then, another tool holder 1 can be adjusted so that it can extend outward along the radial direction of the boring tool body 3 through the inclined sliding connection mechanism to a set position that meets the requirements of the radius size of the stepped outer hole, and is positioned and locked through the tool holder positioning and locking mechanism. The blade 2 of the tool holder 1 corresponding to the stepped inner hole is in front, and the blade 2 of the tool holder 1 corresponding to the stepped outer hole is in the back, as shown in FIG. Figure 2 As shown in (a), during the boring process, the blade 2 of the tool holder 1 corresponding to the stepped inner hole first contacts the workpiece to be processed. Figure 2 As shown in (b), the blade 2 of the tool holder 1 corresponding to the stepped outer hole contacts the workpiece to be processed, which can realize the function of step boring. After boring to the set depth, the tool is withdrawn, and the process is completed. Figure 2 Boring of the stepped hole shown in (c) When the two tool holders 1 are controlled to extend outward in the radial direction of the boring tool body 3 to the same extent, the tool can be used as a common double-edged boring tool.

[0019] In order to further reduce the probability of knife letting or knife chattering, as a further improvement of the present invention, Figure 1 As shown, the rear end of the bevel of the bevel sliding connection mechanism corresponds to the blade mounting seat of the tool holder 1, that is, the thickness dimension of the outer end of the tool holder 1 along the front-to-back direction is greater than the thickness dimension of the inner end of the tool holder 1 along the front-to-back direction, and the tool holder 1 can be a wedge-shaped structure that is wide on the outside and narrow on the inside. With this arrangement, during the boring process after the tool holder 1 is positioned and locked by the tool holder positioning and locking mechanism, the cutting radial force borne by the tool holder 1 can cause the tool holder 1 to have a tendency to slide inwardly, and the bevel sliding connection mechanism can form self-locking under the action of its bevel and the clamping force of the tool holder positioning and locking mechanism. The greater the cutting radial force borne by the tool holder 1, the greater the self-locking force, thereby reducing the probability of tool letting go and tool chattering.

[0020] The tool clamp positioning and locking mechanism can adopt a structure for locking the tool clamp 1 along the axial direction of the boring tool body 3, or a structure for locking the tool clamp 1 along the direction of the inclined plane perpendicular to the inclined plane sliding connection mechanism. As an embodiment of the tool clamp positioning and locking mechanism of the utility model, when adopting a structure for locking the tool clamp 1 along the axial direction of the boring tool body 3, the tool clamp positioning and locking mechanism includes an oblong mounting hole arranged on the tool clamp 1, a locking screw cooperating with the oblong mounting hole, and a threaded mounting hole corresponding to the locking screw and located in the boring tool body 3. The oblong mounting hole on the tool clamp 1 penetrates the tool clamp 1 along the front-to-back direction, and the direction of the oblong mounting hole corresponds to the direction of the inclined plane of the inclined plane sliding connection mechanism, and the axial direction of the locking screw is arranged along the axial direction of the boring tool body 3.

[0021] In order to ensure that the tool holder 1 accurately slides along the inclined surface of the inclined surface sliding connection mechanism, as a further improvement scheme of the utility model, a directional sliding structure is also provided between the two inclined surfaces of the inclined surface sliding connection mechanism. The directional sliding structure can be a guide groove and guide key structure, or it can be other linear sliding guide structures such as a dovetail groove and dovetail protrusion structure.

[0022] In order to facilitate accurate adjustment of the dimension of the tool holder 1 extending outward in the radial direction of the boring tool body 3, as a further improvement scheme of the present utility model, a sliding reference line and a sliding scale can be correspondingly provided between the tool holder 1 and the boring tool body 3, and the sliding scale can be engraved with sliding scales converted according to the inclination of the inclined surface.

Claims

1. A boring tool with a large boring amount, comprising a tool holder (1) and a boring tool body (3), wherein a tool handle (4) is coaxially fixed to the rear end of the boring tool body (3); characterized in that: The tool holder (1) is arranged at the front end of the boring tool body (3), and the tool holder (1) is at least symmetrically arranged in two parts relative to the center of the boring tool body (3). A matching inclined sliding connection mechanism is arranged between the rear end of the tool holder (1) and the front end of the boring tool body (3), and the inclined surface of the inclined sliding connection mechanism is inclined along the front-back direction. A blade mounting seat is arranged at the front outer side end of the tool holder (1), and a blade (2) is detachably mounted on the blade mounting seat. A tool holder positioning locking mechanism is also arranged between the tool holder (1) and the boring tool body (3).

2. The boring tool with a large boring amount according to claim 1, characterized in that: The rear end of the inclined surface of the inclined surface sliding connection mechanism is arranged corresponding to the blade mounting seat of the tool holder (1).

3. The boring tool with a large boring amount according to claim 1 or 2, characterized in that: The tool clamp positioning and locking mechanism comprises an oblong mounting hole arranged on the tool clamp (1), a locking screw cooperating with the oblong mounting hole, and a threaded mounting hole cooperating with the locking screw and located in the boring tool body (3); the oblong mounting hole on the tool clamp (1) penetrates the tool clamp (1) in the front-to-back direction, and the direction of the oblong mounting hole corresponds to the direction of the inclined surface of the inclined surface sliding connection mechanism; the axial direction of the locking screw is arranged along the axial direction of the boring tool body (3).

4. The boring tool with a large boring amount according to claim 1 or 2, characterized in that: A matched directional sliding structure is also provided between the two bevels of the matched bevel sliding connection mechanism.

5. The boring tool with a large boring amount according to claim 1 or 2, characterized in that: A sliding reference line and a sliding scale are correspondingly arranged between the tool holder (1) and the boring tool body (3).

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