KR960003486Y1 - Face milling cutter - Google Patents

Abstract

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Description

Cutting tool

1 is an axial sectional view of the cutter body of the front milling cutter showing one embodiment of the present invention.

2 is a bottom view of the cutter main body shown in FIG.

3 is an enlarged view of the tip circumference of the cutter body.

4 is a side view of the clamp member.

FIG. 5 is a view of the clamp member in FIG. 4 viewed in the A direction. FIG.

FIG. 6 is a view of the clamp member in FIG. 4 viewed from the B direction. FIG.

7 is a side view showing a modification of the clamp member.

FIG. 8 is a view of the clamp member in FIG. 7 seen in the C direction. FIG.

FIG. 9 is a view of the clamp member in FIG. 7 seen in the D direction. FIG.

10 is a diagram showing a conventional front milling cutter, and is an explanatory view of the front milling cutter with the cover fixed to the eastern part of the acetabular tool.

11 is a longitudinal sectional view of a conventional front milling cutter attached to a tool body in which a cover is rotated.

FIG. 12 is a bottom view of the front milling cutter shown in FIG.

* Explanation of symbols for main parts of the drawings

20: cutter body 23: drawaway tip

23a: Rake surface 26: Clamp member

28: chip guide 40: cover

42: chip storage chamber 45: suction port

The present invention relates to a cutting tool mainly used for plane cutting, such as a milling cutter. Specifically, the cutting tool and the chip of the cutting tool, which can sequentially process the chips generated as the cutting proceeds. It is about a discharge mechanism.

As an example of a turning tool used for planar processing of a workpiece, there is one described in US Patent No. 2944465 (1960), which will be described with reference to FIG.

In the drawing, the cutter body 30 rotated around the axis has a drive shaft not shown in the drawing, in which the tip (bottom) surface is supported in the motor case 31 formed of an annular shoulder portion 31a. It is connected to the rotor and is supported rotationally.

A plurality of cutting edges 33 are attached to the front end surface of the cutter body 30, and a plurality of flexible vanes 38 are arranged at a predetermined angle with respect to the radial direction on the outer circumference thereof. The cylindrical case 34 surrounding the proximal end of the cutter body 30 is fixed to the annular shoulder portion 31a of the motor case 31, and the cylindrical case 34 is formed by the small size of the cutter body 30. An opening is formed on the tip side by wrapping the neck and the large diameter part on the tip side. The opening of the cylindrical cover 35 is located slightly retracted toward the proximal end than the distal end of the cutter body 30.

Between the inner circumferential surface of the cylindrical cover 35 and the cutter body 30 is a chip storage chamber 36, which is connected to a suction mechanism from one side of the cylindrical cutter 35. It communicates with (37).

And the chip | tip produced by the cutting edge 33 at the time of the rotary cutting of the to-be-processed material W by this tool is gathered by the vane 38, and the inside of the cylindrical cover 35 is attracted by the suction force of the suction mechanism. It is drawn into the chip storage chamber 36 and discharged | emitted from the connection pipe 37. As shown in FIG.

As another example, the face milling cutter shown in Japanese Patent Laid-Open No. 1-109014 is known.

This front milling cutter has a tip groove 7 which opens toward the distal end and the outer circumferential surface of the cutter main body 6, as shown in Figs. 11 and 12, of the cutter main body 6 having a substantially cylindrical shape. And a plurality of chip pockets 17 are formed at regular intervals along the circumferential direction, and a wedge member in which a drawaway tip (hereinafter abbreviated as “tip tip”) 8 is fastened with a clamp screw in these tip mounting grooves 7. (9) is detachably attached. Moreover, the center hole 6a which penetrates the cutter main body 6 in the axial direction is formed in the center of the cover main body 6.

The front milling cutter configured as described above is fastened by the fastening bolt 11b after the center hole 6a is coupled to the coupling shaft of the arbor 12 attached to the main shaft 11 of the machine tool via the key 11a. It is fastened and integrated with the main shaft.

In addition, the arbor 12 has an upper end portion of the chip housing 13 formed in a substantially cylindrical shape so as to cover the outer circumferential surface of the cutter body 6 by the bearing ring 14.

Therefore, even when the cutter main body 6 is rotated, the chip housing 13 is supported in a non-rotating state. The tip outer circumferential portion of the chip housing 13 is slightly retracted toward the proximal side than the tip cutting edge of the tip 8 in the protruding length in the rotational axis direction, and has a slight gap between the tip cutting edge and the outer cutting edge of the tip 8. Is formed.

The space between the chip housing 13 and the cutter body 6 constitutes the chip housing 13b, and the chips sucked by the connection pipe 15a of the suction means 15 communicating therewith are discharged. .

The space between the chip housing 13 and the cutter body 6 constitutes the chip housing 13b, and the chips sucked by the connection pipe 15a of the suction means 15 communicating therewith are discharged. .

In addition, a ring-shaped chip guide member 16 is mounted on the front end surface of the cutter body 6, and the chip eye member 16 is a ring-shaped gap with a gap corresponding to each chip pocket 17. The hook-shaped protrusion pieces 16a which protrude from the outer peripheral surface position of to radially outer side, respectively, are formed. The hooked protrusions 16a are formed to cover the tip side and the outer circumferential side of the chip pocket 17 so as to leave a slight gap between the tip lake surface and the chip housing 13, respectively. It is positioned so as to retreat slightly in the radial direction than the outer edge.

Then, the cutter body 6 is rotated about the axis line by the main shaft 11 and is transferred in a direction orthogonal to the axis line, so that the tip machined the workpiece in a plane, and the chip generated is the chip guide member 16 and It is cut while being guided into the inside of the chip pocket 17 from the tip lake surface and rolled up, and is led to the chip storing portion 17a in the chip storing body 13 by negative pressure, and is attracted by the suction means 15. It is intended to be sucked and discharged.

By the way, in the former face milling cutter described above, in the former case, since there is a considerable distance between the cutting edge 63 and the chip housing 65, there is a defect that the chip is scattered to the surroundings, the vane 68 to collect the chip. ), After the abrasion is severe, the resulting chip is not sufficiently guided into the inside of the chip housing 65, and it is impossible to be sucked, and thus the chip is likely to scatter. Therefore, chips are accumulated in workpieces, machine tools, and the like, and thermal deformation of the chips causes deterioration in processing accuracy, deterioration of the cutting surface, and the like. In addition, since the gap between the tip opening of the chip housing 65 and the tip of the cutter main body 60 is large and spans the entire circumference of the cutter main body, the chip is induced and reliably sucked even when the suction force of the suction mechanism is increased. There is also a drawback that it cannot exhibit sufficient suction function.

Next, in the latter face milling cutter, the gap between the chip housing 13 and the tip lake surface can be set small by the chip guide member 16 which improves the former defect. However, this chip guide member 16 is formed by integrally forming each of the hooked projections 16a. On the other hand, there are errors in recessed grooves, chip pockets, tip mounting sheets, tip shapes, and tip attachment postures, and by attaching one chip guide member 16, all tips 8 and chip housings 13 There is a drawback that it is difficult to mount each hook-shaped protruding piece 16a at a time with a gap within a predetermined range. Therefore, it is not always sufficient to induce the chip from the gap reliably or to sufficiently increase the suction force acting on the gap.

The present invention has been made in view of such a point, and the chip discharged from the turning tool and the turning tool which guides the chip generated as the cutting progresses in a predetermined direction more reliably away from the machining surface of the workpiece and can be processed. An object is to provide an apparatus.

In order to solve the above problems, the cutting tool according to the present invention is provided with a plurality of cutting edge tips each having a cutting edge on the front end side and the outer circumferential side at predetermined intervals at the outer peripheral end of the cutter body which rotates about an axis. In a turning tool in which a chip pocket is provided in front of a cutting direction of a cutting blade tip, a chip guide part is separately provided on each chip pocket of the cutter main body, and each chip guide part has a cutting edge tip at the tip side of the cutter main body. A gap is formed between the rake face of the cutting edge side and a gap is formed between the rake face of the cutting edge tip of the cutting edge on the outer circumferential side of the cutter body.

In addition, in the cutting tool according to the present invention, a plurality of cutting tips having cutting edges are provided on the tip side and the outer peripheral side at predetermined intervals, respectively, at predetermined intervals on the outer peripheral portion of the tip of the cutter main body that rotates about an axis line, and the cutting direction of the cutting tip is rotated. In a turning tool composed of chip pockets provided at the front, a substantially cylindrical cover covering the outer circumferential surface of the cutter body and opening to the tip side of the cutter body is provided, and the inner peripheral surface of the cover A chip storage chamber is formed between the outer circumferential surface of the cutter body, and a gap is formed between the inner circumferential surface of the front end side of the cover 40, and the communication portion connecting the chip storage chamber and the suction means is described above. It is characterized in that the chip is installed on the cover to configure the chip.

In the cutting tool of the above-mentioned structure, the chip | tip produced by each cutting edge is forcibly guided in the chip pocket from each clearance gap of a front end side and an outer peripheral side, and is conveyed in the direction away from the processing surface of a workpiece.

In the chip discharging mechanism of the electrocution tool of the above-described configuration, the gap formed on the tip side and the outer circumferential side between the chip guide portion and the tip rake surface respectively provided by sucking air from the chip storage chamber in the cutter from the communicating portion. The suction force acts on the gap, and the gap can be set individually according to the mounting position of each chip guide, so that the suction force is concentrated around the cutting edge, and as a result, it is generated by each cutting edge of the cutting edge tip. The chip is sucked into the immersion storage chamber while being forcibly guided by the gap between the rake surface and the chip guide portion, and is sucked and recovered to the outside of the cover via a communication portion communicating with the chip storage chamber.

EXAMPLE

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 6.

Reference numeral 20 in FIGS. 1 to 3 is a cutter body. The cutter body 20 is a substantially cylindrical body having a center hole 21, and a plurality of concave grooves 22, which are opened at the tip and the outer circumference of the cutter body 20, at regular intervals along the circumferential direction at the tip outer peripheral part thereof. Formed. In the concave groove 22, a tip 23 having a flat plate shape is fastened with a clamp screw 25 in a state in which each cutting edge 24 protrudes from the front end surface and the outer peripheral surface of the cutter body 20. The clamp member 26 is mounted in a detachable state.

As shown in detail with reference to FIGS. 4 to 6, the clamp member 26 is inserted between the wall surface of the concave groove 22 and the rake surface 23a of the team 23 to insert the tip 23. ) Is composed of a wedge portion 27 for pressing in the circumferential direction of the tool and a chip guide portion 28 protruding from the distal end of the wedge portion 27 toward the tool radial direction.

The wall surface 27a facing the tool outer peripheral side of the wedge portion 27 is formed as a curved surface recessed in an arc shape from the tip outer peripheral surface of the cutter body 20 toward the tool inner peripheral side, and this wall surface 27a And a space formed between the outer peripheral surface of the tip of the cutter body 20 and the chip body for rolling the chips generated by the cutting edge 24 roundly. Moreover, the front end surface of the wedge part 27 is formed in substantially the same surface as the front end surface of the cutter main body 20. As shown in FIG.

On the other hand, the chip guide portion 28 extends to the position where the outer circumferential end surface 28a slightly retracts toward the tool inner circumferential side than the cutting edge 24 facing the tool outer circumferential side of the tip 23, and the concave groove It is configured so that the 22 is almost closed at the tool tip.

The retraction amount δ1 of the outer circumferential side end face 28a of the chip guide portion 28 with respect to the cutting edge 24 is appropriately determined depending on the material of the workpiece, cutting conditions, and the like, and is in the range of 0.2 to 1.0 mm. It is preferable to set to. If the retraction amount δ1 is less than 0.2 mm, the chip guide portion 28 may dig into the workpiece due to an error at the time of mounting the tip 23, and if the retraction amount δ1 exceeds 1.0 mm, the above-mentioned end face This is because the gap between (28a) and the inner circumferential surface of the tip of the cover, which will be described later, becomes large, and the suction force of the chip, which will be described later, is insufficient, which may cause a problem in chip processing.

As shown in Figs. 3 to 6, a section allowing passage of chips generated along the rake surface 23a on a cross section facing the tip lake surface 23a of the chip guide portion 28 described above. The joint 29 is formed.

The gap t between the cutout portion 29 and the rake face 23a is appropriately determined depending on the material of the workpiece, the cutting conditions, and the like, and is preferably set in the range of 0.2 to 1.0 mm. If the gap t is less than 0.2 mm, the chip may be blocked by the gap t, and processing of the chip may be delayed. On the other hand, if the gap t exceeds 1 mm, the chip's suction force, which will be described later, may be insufficient and the chip may be processed. This is because there is a risk of causing trouble.

In addition, the chip guide portion 28 is provided with a trough portion 30 that opens toward the concave groove 22. The trough portion 30 opens to the cutout portion 29 described above, and extends the gap t between the cutout portion 29 and the rake face 23a toward the concave groove 22. The chipping through the binder 29 is prevented.

On the other hand, as shown in FIG. 1 and FIG. 2, the cutter body 20 has the fastening bolt 34 in the state in which the center hole 21 is engaged with the engagement shaft 33 of the arbor 32. As shown in FIG. The shaft is fastened in the axial direction and integrated with the arbor 32.

This arbor 32 is for connecting the main shaft 35 of the machine main body and the cutter main body 20, and is interposed between the key 37 and the main shaft 35 interposed between the cutter main body 20. It is possible to transmit the rotation of the main shaft 35 to the cutter body 20 by the key 38.

In the support shaft 39 formed on the coupling shaft 33 of the arbor 32, the cover 40 is rotated via a radial bearing (hereinafter referred to as “bearing bearing”) 41. Attached.

The cover 40 is formed in a substantially cylindrical shape opening toward the tool tip side, and the tip extends to a position overlapping the chip guide portion 28 of the clamp member 26 in the tool axial direction. have. The inner diameter of the tip of the cover 40 is set slightly larger than the turning radius of the cutting edge 24 described above.

The gap δ2 in the tip inner circumferential surface of the cover 40 and the cutting blade 24 in the tool radial direction is appropriately determined depending on the material of the workpiece, the cutting conditions, and the like, and a range of 0.5 to 2.0 mm is preferable. In order to perform a more reliable chip processing, it is preferable to set in the range of 0.5-1.0 mm. If the gap δ2 is less than 0.5 mm, the cutting edge 24 may dig into the cover 40 due to the eccentricity of the cover 40 or the like. On the other hand, if the gap δ2 exceeds 2 mm, the amount of chips generated This is because there is a fear that the suction force of the chip, which will be described later, will be insufficient due to cutting conditions.

A chip storage chamber 42 is formed between the inner circumferential surface of the cover 40 and the outer circumferential surface of the cutter body 20. The chip storage chamber 42 is separated from the side facing the bearing 41 of the cover 40 by the shaft diameter portion 43 formed on the proximal end side of the cover 40.

Moreover, the through-hole 44 is formed in the outer peripheral surface of the said cover 40, The tubular suction port 45 is fitted in this through-hole 44. As shown in FIG. A suction hose 46 of a suction port (not shown in the drawing) is fitted to the outer circumference of the suction port 45, whereby the chip storage chamber 42 communicates with the suction device. The cover 40 is constrained by the suction hose 46 to prevent its rotation.

In the case of cutting the workpiece using the front milling cutter configured as described above, the cutter main body 20 is first attached to the main shaft 35 via the arbor 32. Thereafter, while sucking the air in the chip storage chamber 42 by the suction port connected to the suction port 45, the cutter main body 20 is rotated about the axis and transferred in a direction perpendicular to the axis so that the cutter main body ( The workpiece is cut by the cutting edge 24 protruding from the tip end face and the outer peripheral face of 20), respectively.

At this time, since the air is sucked by the aspirator inside the chip storage chamber 42, negative pressure is generated. Therefore, a gap between the cutout portion 29 formed in the chip guide portion 28 of the clamp member 26 and the tip brake surface 23a, and the tip inner peripheral surface of the tip portion of the cover 40 and the chip guide portion 28a. The air around the cutter main body 20 is drawn in turn from the gap between them, and as a result, the suction force toward the chip storage chamber 42 is concentrated in the vicinity of the cutting edge 24.

Accordingly, the chip generated along the rake surface 23a from the cutting edge 24 is guided to the gap between the cutout portion 29 of the chip guide portion 28 and the rake surface 23a, and the chip storage chamber 42 V) is strongly attracted toward the c), rolled up by the wall surface 27a of the clamp member 26, cut off, and then is introduced into the chip storage chamber 42. Then, the suction hose 46 is removed from the chip storage chamber 42. The suction and recovery are carried out by means of an aspirator through a).

As described above, according to the face milling cutter of the present embodiment, the chips generated at the time of cutting are sucked and collected in sequence without scattering around the machine, thereby greatly improving the working environment and greatly reducing the time required for processing the chips. Effect is obtained. In addition, since chips do not accumulate in the workpiece or table of the machine tool, not only does the degradation of the machining accuracy due to the deformation of the workpiece and the machine, and the deterioration of the quality of the cutting surface due to the bite of the chip, but also the sliding surface of the machine tool. Intrusion of chips into the back and the like is also eliminated, and a decrease in the precision and the life of the machine tool is also prevented.

In addition, since the chip guide portion 28 is attached to each chip pocket individually, each concave groove 22, as compared with the conventional configuration of forming a chip guide gap of all chip pockets on one chip guide plate. It is easy to cope with the error of the shape dimension of the chip pocket, the dimensional error of the tip and the difference of the attachment posture, and it is possible to set a high-precision cutting guide gap, so that the chip can be guided more reliably. The attraction force is strong. Moreover, when the diameter of the front-end | tip part of a cutter main body differs (for example, when the chip guide part 28 for 100 micrometer diameter is applied to the cutter main body of 400-500 micrometer diameter), it can fully respond, Even if the gap is slightly increased or decreased, it is just negligible. In addition, even if the chip guide 28 is damaged, only one replacement is required.

In addition, in the present embodiment, since the chip guide portion 28 is provided in the clamp member 26, it is not necessary to modify the tip shaft of the cutter body 20 to cover the recessed groove 22. In addition, since the cover 40 and the suction port 45 are attached to the arbor 32, it is not necessary to modify the cutter body 20 to cover the circumferential surface of the cutter body 20. Therefore, the cutter main body conventionally used can be used easily, and the outstanding effect which can process a chip | tip shows.

In the present embodiment, the chip guide 28 is formed integrally with the clamp member 26, but the present invention is not limited to this. For example, the chip guide 28 is shown in FIGS. As described above, the wedge portion 27 and the chip guide portion 28 may be formed separately and connected to the bolt 50. In this case, the gap t between the cutout portion 29 and the tip brake surface 23a can be easily adjusted in accordance with the shape of the chip to be produced, and the effect can be easily exchanged even in case of breakage.

In addition, in the present embodiment, the clamp member 26 is specifically pressed against the tip 23 by the wedge effect, but the present invention is not limited thereto, and the tip 23 is directly fastened along the thickness direction. Various modifications are possible.

In addition, although the cover 40 is supported by the arbor 32 in the rotational state in the above-mentioned embodiment, this invention is not limited to this. For example, the cover 40 may be fixed around the main axis of the machine tool, for example, in a state of being relatively rotatable with respect to the cutter body 20, that is, stopping against rotation of the cutter body 20. What is necessary is just to be installed so that the suction hose 46 may be connected to the suction port 45.

As described so far, according to the cutting tool according to the present invention, the chips generated on each cutting edge are forcibly guided into the chip pockets from the gaps between the tip side and the outer circumferential side, and in a predetermined direction falling from the machining surface of the workpiece. Since it is sent, it can collect in order rather than scattering around a machine, and it does not damage the machine tool or the workpiece surface. In addition, since the chip guide portion is attached to each chip pocket individually, compared with the conventional chip guide plate, it is easy to cope with the error of the shape dimension of each chip pocket, the dimensional error of the cutting edge tip, the difference of the attachment posture, High precision cutting guide gaps can be set, resulting in more reliable and guided chips. Moreover, even when the diameter of the front-end | tip part of a cutter main body differs, it can fully respond, and it is only a negligible degree even if a clearance increases or decreases at that time. In addition, even if the chip guide 28 is damaged, only one of them needs to be replaced.

In addition, according to the chip discharging mechanism of the electric tool according to the present invention, in addition to the above-described effects, the chips generated at the time of cutting can be sucked and collected sequentially without scattering around the machine, thereby greatly improving the working environment. At the same time, processing time can be greatly reduced. In addition, it is possible to prevent chips from thermal deformation due to chip deposition, chipping or chip intrusion into the sliding surface of the machine, etc. As a result, deterioration of machining accuracy, deterioration of cutting surface quality and degradation of machine sleep are prevented. do. In addition, according to the present invention, since the chip guides are individually provided for each chip pocket, the gaps for chip guides can be set more precisely, the suction force is stronger, and the chips can be inductively sucked reliably. Will be.

Claims (2)

In the tip outer peripheral part of the cutter body which rotates about an axis line, a plurality of cutting edge tips with cutting edges are respectively provided at the front end side and the outer peripheral side at predetermined intervals, and a chip pocket is provided in front of the cutting direction of the cutting edge tip. In the tool, the chip guides 28 are separately provided in the respective chip pockets of the cutter body 20, and the chip guides 28 are formed at the front end side of the cutter body 20. A gap is formed between the rake surface of the cutting edge side cutting edge and a gap is formed between the rake surface of the cutting edge tip of the cutting edge tip on the outer circumference side of the cutter body 20. A cutting tool, characterized in that. The cover is provided in a substantially cylindrical shape covering the outer circumferential surface of the cutter body, and the tip of which is open to the tip side of the cutter body, and the inner circumferential surface of the cover and the outer circumferential surface of the cutter body. The chip storage chamber is formed between the chip housings, and a gap is formed between the inner peripheral surface of the tip side of the cover 40, and a communication portion connecting the chip storage chamber and the suction means is provided in the cover, and the chip storage mechanism is provided. The grinding tool, characterized in that the configuration.