JP7402632B2 - Chip processing equipment - Google Patents

Description

The present invention relates to a chip processing device for processing chips generated during cutting.

Patent Document 1 describes a chip collection device as a chip processing device provided in a hobbing machine. This chip collection device includes a hopper located below a hob cutter serving as a cutting tool, a suction mechanism that sucks chips stored in the hopper, and a collector that collects the sucked chips. In this chip collection device, chips around the hob cutter can be well collected into the collector.

Japanese Patent Application Publication No. 2001-47312

An object of the present invention is to make it difficult for chips to approach the cutting point between a cutting tool and a workpiece during cutting.

The chip processing device according to the present invention includes a retention part that retains the flow of chips in a direction toward a cutting point between a cutting tool and a workpiece, and an air jet port that opens in a direction that intersects the rotational direction of the cutting tool. and an air blowing device having an air blowing device. The chips whose flow is stagnant in the stagnation section are flown by the air blowing device in a direction intersecting the rotational direction of the cutting tool. As a result, it is possible to make it difficult for chips to flow to the cutting point between the cutting tool and the workpiece.

1 is a front view of a hobbing machine equipped with a chip processing device according to an embodiment of the present invention. It is a side view of the above-mentioned hobbing machine with a work holding part removed. It is a figure showing a hob cutter and a workpiece in the above-mentioned hobbing machine. FIG. 2 is a perspective view conceptually showing the chip processing device. It is a front view conceptually showing the above-mentioned chip processing device. It is a front view conceptually showing a chip processing device different from the chip processing device described above.

EMBODIMENT OF THE INVENTION Hereinafter, an example of the chip processing apparatus based on one Embodiment of this invention is demonstrated in detail based on drawing. This chip processing device can be attached to, for example, a hobbing machine that forms teeth on the outer peripheral surface of the work W using a hob cutter as a cutting tool.

As shown in FIGS. 1 and 2, the hobbing machine includes a bed 10, a column 12 provided on the bed 10, a rotary table 14 that holds a workpiece W, and the like. In this embodiment, the column 12 is movably provided on the bed 10, so that the column 12 and the rotary table 14 can approach and separate from each other. A vertically movable hob saddle 20 is held in a portion of the column 12 facing the rotary table 14, and a hob head 22 is held in the hob saddle 20 so as to be rotatable around an axis extending in the horizontal direction. A main shaft holder 25 that holds a main shaft 24 extending in an axial direction perpendicular to the rotational axis of the hob head 22 is held in the hob head 22 so as to be movable in a direction parallel to the main shaft 24 by a shift device 30 . Further, a hob cutter 28 as a cutting tool is detachably attached to the main shaft 24 via a hob arbor 26 .

A machining shaft 32 is integrally and rotatably attached to the rotary table 14, and a workpiece W is held on the machining shaft 32. In this embodiment, the direction in which the column 12 and the rotary table 14 are lined up, in other words, the direction in which the rotational axis of the hob head 22 extends is the x direction, the vertical direction is the z direction, and the direction perpendicular to the x and z directions is the y direction. do. In the state shown in FIG. 2 (for example, the state in which the rotation angle of the hob head 22 around the x-axis is 0), the main shaft 14 is extended and the direction in which it can be moved by the shift device 30 is the y-direction.
In the hobbing machine, cutting is performed on the outer peripheral surface of the workpiece W by rotation of the hob head 22 around the x-axis, rotation of the hob cutter 28 around the axis, vertical movement, movement in the axial direction, and rotation of the workpiece W. , teeth are formed. Thereby, as shown in FIG. 3, a helical gear is formed as the workpiece W.

On the other hand, dry machining without using coolant is sometimes performed to improve the working environment. In dry machining, chips generated by cutting are scattered, and fine chips (for example, small ones, thin ones, etc.) tend to rotate as the hob cutter 28 rotates. The chips may reach the vicinity of the cutting point and be thermally welded to the workpiece W, resulting in defective products.
Therefore, in this embodiment, a chip processing device 40 is provided in order to make it difficult for chips generated by cutting to reach the cutting point. Further, the chip processing device 40 can be provided on the outer peripheral side of the hob cutter 28 of the spindle holding portion 25 by fixing it to the spindle holding portion 25 with bolts or the like (not shown).

The chip processing device 40 includes a housing 42 that extends generally in the axial direction and the circumferential direction and covers a portion of the outer circumference of the hob cutter 28, as shown in FIGS. Both ends of the housing 42 in the axial direction are open. The housing 42 can be manufactured, for example, by bending a metal plate member. A downstream portion of the housing 42 in the circumferential direction in the rotational direction of the hob cutter 28 serves as a retention portion 44 that retains the flow of chips toward the cutting point C. An air jet port 46 of an air jet device 48 is located inside the retention section 44 .

The cross-sectional shape of the retention portion 44, that is, the downstream portion of the housing 42, perpendicular to the main axis 24 is generally U-shaped. The housing 42 includes, for example, a first shielding plate part 52 as a first shielding part, a second shielding plate part 54 as a second shielding part, and an outer plate part 56. In this embodiment, the retention section 44 is constituted by the first shielding plate part 52, the second shielding plate part 54, a part of the outer plate part 56, and the like.

The first shielding plate portion 52 has one end located close to the outer peripheral edge of the hob cutter 28 and extends to intersect the tangent S of the hob cutter 28 at an angle of 90° or less in the rotation direction. In other words, the angle θ1 between the first shielding plate portion 52 and the tangent S is 90° or less. In this way, by setting the angle θ1 to 90° or less, chips can be made more difficult to flow out from the gap a than when the angle θ1 is larger than 90°. Note that it is desirable to make the gap a small.

Further, the second blocking plate portion 54 is provided so as to be inclined in a direction in which an extension line of the second blocking plate portion 54 passes through the cutting point C or the vicinity of the cutting point C. After various studies, we determined that the first shielding plate part 52 has the shape shown above, and that the second shielding plate part 54 is inclined in a direction in which the extension line passes through the cutting point C or the vicinity of the cutting point C. It has been found that by providing this, the volume of the retention section 44 can be set to an appropriate size. As a result, the chips inside the retention section 44 can be effectively flowed out by the air blowing device 48.
In this embodiment, the angle formed by the first shielding plate part 52 and the second shielding plate part 54 that are adjacent to each other is often 90 degrees or less. In this way, when the angle between the first shielding plate part 52 and the second shielding plate part 4 is 90° or less, the chips are more likely to form between the first shielding plate part 52 and the second shielding plate part 4 than when the angle is larger than 90°. 2 shielding plate portions 54, and can be made difficult to flow out through the gap a.

The outer plate portion 56 is provided with a gap from the outer circumferential surface of the hob cutter 28 and is provided so as to cover the outer circumferential surface of the hob cutter 28 . The outer plate portion 56 has a shape that substantially follows the outer peripheral surface of the hob cutter 28. The outer plate portion 56 prevents chips from flowing toward the outer circumference.

Air blowing device 48 includes an air source 58 and an air passageway 60 connected to air source 58 . The air passage 60 is inserted through an opening at one end of the housing 42 in the axial direction, and the air jet section 62 including the air jet port 46, which is the opening of the air passage 60, is inserted into the end of the retention section 44 of the housing 42 in the axial direction. It is located nearby. It is desirable that the air outlet 46 be located near the end in the axial direction and approximately at the center of the retention portion 44 in the circumferential direction.
Further, the air outlet 46 is opened in a direction that allows air to be ejected in a direction that intersects the rotational direction of the hob cutter 28, and in this embodiment, in a direction that allows air to be ejected in a direction that is approximately parallel to the rotational axis of the hob cutter 28. do.

The housing 42 includes a third shielding plate section 66 that is provided upstream of the retention section 44 and serves as an upstream shielding section that prevents chips from entering the retention section 44 . It is desirable that the third shielding plate portion 66 extends in a direction such that the angle θ2 formed with the tangent S' of the hob cutter 28 is 90 degrees or less. By setting the angle θ2 to 90° or less, chips flow into the housing 42 through the gap b between the end of the third shielding plate portion 66 and the outer circumferential surface of the hob cutter 28 than when the angle θ2 is larger than 90°. It can be made difficult.

The chip processing device 40 also includes an air blowing section 70 located downstream of the retention section 44 . The air blowout section 70 blows air toward the cutting point C, thereby making it difficult for chips to approach the vicinity of the cutting point C.

In this embodiment, the chip processing device 40 is provided with the retention portion 44 located upstream of the cutting point C in the rotational direction and near above the hob cutter 28 . Further, it is desirable that the chip treatment device 40 is provided such that the retention portion 44 is located at a central angle of 60° or more and 120° or less of the hob cutter 28 from the cutting point C. When the retention portion 44 is close to the cutting point C, it is possible to make it difficult for the chips to approach the cutting point, but there is a risk that they may interfere with jigs and the like located around the workpiece. In view of the above, in this embodiment, the chip processing device 40 is provided with the retention portion 44 located approximately above the hob cutter 28, that is, at a portion spaced apart from the cutting point C by approximately 90° in the central angle. be.

In the hobbing machine configured as described above, teeth are formed on the outer peripheral surface of the workpiece W by the relative rotation and relative movement between the hob cutter 28 and the workpiece W. In this case, chips are generated at the cutting point C, which is the intersection of the hob cutter 28 and the workpiece W, and fine chips among the chips flow in the rotation direction as the hob cutter 28 rotates. Some of the chips that rotate as the hob cutter 28 rotates hit the third shielding plate portion 66, but some of the chips also flow into the housing 42 through the gap b. The flow of the chips in the rotational direction is suppressed by the first shielding plate part 52 and the second shielding plate part 54, and the chips stay there. The chips accumulated in the accumulation part 44 can flow smoothly in the axial direction of the hob cutter 28 due to the air ejected from the air outlet 46, and can exit from the opening at the end of the housing 42. In addition, because the angle formed by the first shielding plate part 52 and the second shielding plate part 54 is 90 degrees or less and the gap a is small, the chips in the retention part 44 can be flowed out from the gap a. It can be made difficult.
As a result, the chips can flow out from the gap a, making it difficult to approach the cutting point C, and making it difficult for the chips to adhere to the workpiece W. The defective rate of the workpiece can be lowered, and the defective rate has been improved by 60% by the chip processing device 40.

Note that the shape of the retention portion does not matter. The retention portion may have a curved shape, for example, as shown in FIG. 6 . In this embodiment, the retention section 80 provided on the downstream side of the housing 78 includes a first shielding plate section 82 extending in a direction intersecting the tangent S at an angle of 90 degrees or less, and in the rotation direction of the hob cutter 28. It forms a convex curved shape. An air jet port 46 is opened approximately at the center of the retention portion 80 . In the present embodiment, the chips that have accumulated inside the retention section 80 can be effectively flowed out using air, making it difficult for the chips to remain inside the retention section 80.

Further, an air suction portion can be provided near the opening at the end of the housing 42, 78 opposite to the side where the air jet passage 60 is provided. The air suction part can suck air together with chips.
Furthermore, the third shielding plate part 66 and the air blowing part 70 are not essential.

Further, in the above embodiment, a case has been described in which the cutting tool is a hob cutter and the workpiece is a helical gear, but the cutting tool is not limited to a hob cutter, and the workpiece is not limited to a helical gear. The cutting tool can be a tool that performs cutting on the outer peripheral surface of a cylindrical workpiece by rotation, and can be broadly used as a tool for gear cutting and milling. Further, it is effective for cutting tools with a diameter of 200 mm or less that easily traps chips generated at the cutting point.
Further, the workpiece may be a gear such as a spur gear or a worm wheel, in which teeth are formed on the outer peripheral surface of a cylinder.
In addition, the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art.

25: Spindle holding part 28: Hob cutter 40: Chip processing device 42: Housing 44, 80: Retention part 46: Air jet port 48: Air jet device 52: First shielding plate part 54: Second shielding plate part 66: No. 3 Shielding plate part

Patentable inventions

(1) A chip processing device that processes chips generated when cutting the outer peripheral surface of a workpiece by rotating a cutting tool around its axis,
a housing provided on the outer peripheral side of the cutting tool and extending in a direction parallel to the axis;
an air ejection device located inside the housing and equipped with an air ejection part that ejects air in a direction intersecting the rotational direction of the cutting tool;
A downstream portion of the housing serves as a retention portion for retaining the chips;
A chip processing device characterized in that an air jet port of the air jet section opens into the inside of the retention section.

The retention portion is capable of retaining chips flowing as the cutting tool rotates, and can be referred to as, for example, a damming portion or a bag-shaped portion that dams the flow of chips.
The air outlet may be provided, for example, in a direction substantially perpendicular to the rotational direction of the cutting tool, in other words, substantially parallel to the axis of the cutting tool.
The downstream side is the downstream side in the rotational direction of the cutting tool. Moreover, when the chips flow with the rotation of the cutting tool, it is on the downstream side of the flow of the chips.

(2) The retention portion is located upstream of a cutting point that is a contact point between the cutting tool and the workpiece, and spaced apart from the cutting point by an angle of 60° or more and 120° or less at the central angle of the cutting tool. The chip processing device described in item (1).

(3) According to item (1) or item (2), the retention portion includes a first shielding portion extending in a direction that intersects a tangent to the cutting tool at an angle of 90° or less in the rotational direction of the cutting tool. chip processing equipment.

(4) The chip processing device according to any one of items (1) to (3), wherein the retention portion has a generally U-shaped cross section perpendicular to the main axis of the cutting tool.
The retention section can be manufactured by, for example, bending a plate-like member.

(5) The chips according to any one of paragraphs (1) to (4), wherein the retention section includes a second shielding section whose extension line passes through a cutting point between the cutting tool and the workpiece. Processing equipment.
It is desirable that the angle formed by the first shielding part and the second shielding part is 90 degrees or less.

(6) The chip processing device according to any one of (1) to (3), wherein the retention section has a generally curved shape.

(7) The chip processing device is provided on the upstream side of the retention part, and an upstream shielding part extends in a direction intersecting a tangent to the cutting tool at an angle of 90 degrees or less in the rotational direction of the cutting tool. The chip processing device according to any one of items (1) to (6), including:

(8) The chip processing device according to any one of items (1) to (7), wherein the air jet port is located inside the retention section at approximately the center of a cross section perpendicular to the main axis.
It is desirable that the air outlet be provided at a position where it can scatter the chips that have accumulated inside the retention section in a direction parallel to the axis of the cutting tool, thereby making it difficult for them to remain inside the retention section.

(9) The chip processing device according to any one of (1) to (8), wherein the cutting tool is a hob cutter, and the workpiece is a helical gear.

Claims (7)

A chip processing device for processing chips generated when cutting the outer peripheral surface of a workpiece by rotating a cutting tool around an axis,
a housing provided on the outer peripheral side of the cutting tool and extending in a direction parallel to the axis;
an air ejection device located inside the housing and equipped with an air ejection section that ejects air in a direction parallel to the axis of the cutting tool;
A downstream portion of the housing serves as a retention portion for retaining the chips;
A chip processing device characterized in that an air jet port of the air jet section opens into the inside of the retention section. The retaining portion is located upstream of a cutting point that is a contact point between the cutting tool and the workpiece, and is located at an angle of 60° or more and 120° or less at a center angle of the cutting tool from the cutting point. 1. The chip processing device according to 1. the retention section includes a first shielding section,
The first shielding portion is located at a portion of the tangent at the intersection with the extension line of the first shielding portion of the cutting tool that is located on the rotation direction side of the cutting tool when viewed from a direction parallel to the axis. The chip processing device according to claim 1 or 2 , which extends in directions intersecting at an angle of 90° or less. The chip processing device according to claim 3, wherein the retention section includes a second shielding section adjacent to the first shielding section, and an extension line of which passes through a cutting point between the cutting tool and the workpiece. The chip processing device according to any one of claims 1 to 4, wherein the retention section includes a bag-like part that dams the flow of the chips as the cutting tool rotates. The chip processing device includes an upstream shielding part provided upstream of the retention part,
When the upstream shielding part is viewed from a direction parallel to the axis, the tangent at the intersection with the extension line of the upstream shielding part of the cutting tool has an angle of 90° or less at a portion located on the rotation direction side. The chip processing device according to any one of claims 1 to 5, which extends in directions intersecting at an angle. The chip processing apparatus according to any one of claims 1 to 6, wherein the cutting tool is a hob cutter and the workpiece is a helical gear.

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