JP6052153B2 - Chip removal tool - Google Patents

Description

  The present invention relates to a technology of a chip removal tool for removing chips remaining in an annular gap formed on a workpiece.

  2. Description of the Related Art Conventionally, a chip removal tool for removing chips generated by drilling or chip machining on a workpiece is known (for example, Patent Document 1). The chip removal tool disclosed in Patent Document 1 includes a head portion that can be inserted into an annular gap formed in a workpiece, and the head portion is formed in a cylindrical shape.

  The chip removal tool disclosed in Patent Document 1 is formed in the head portion by inserting the head portion into an annular gap and rotating the head portion within the annular gap by the shaft portion. Chips are collected in the inclined grooves.

  However, when the workpiece is a rough material, for example, the size of the annular gap varies. In the chip removal tool disclosed in Patent Document 1, when the size of the annular gap varies, the head part interferes with the workpiece when the head part is inserted into the annular gap. In addition, the workpiece may be damaged.

JP2013-129010A

  The problem to be solved by the present invention is to provide a chip removing tool that can be inserted into an annular gap without interfering with a workpiece.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, a chip removal tool for removing chips remaining in an annular gap formed in a workpiece, wherein the tool is formed in a substantially cylindrical shape that can be fitted into the annular gap, A fitting portion provided with a scraping portion for scraping off chips, and an expansion / contraction portion for reducing or expanding the diameter of the fitting portion in the radial direction, and the fitting portion is divided into a plurality of fitting pieces in the circumferential direction. A groove through which fluid can pass is formed on the inner peripheral surface of the fitting portion.

  In Claim 2, it is a chip removal tool of Claim 1, Comprising: On the outer periphery of the said fitting part, the urging member which urges | biases each said fitting piece to radial inside is wound, The scraped portion is formed on one side in the circumferential direction of the lower end portion of the fitting piece, and the groove is formed along a substantially axial direction from a substantially central portion to a lower portion on the inner circumferential surface of the fitting piece, A lower end side of the groove is formed toward the scraped portion of the adjacent fitting piece, and an upper portion on the inner diameter side of the fitting piece is formed with a tapered first guide portion along the axial direction, The lower part of the expansion / contraction part can be fitted with the first guide part, a second guide part having a tapered shape along the axial direction is formed, and the second guide part is fitted to the first guide part By sliding the second guide part in the direction approaching and separating from the first guide part, Condensation diameter or the fitting portion in the radial direction is one which diameter.

  According to the chip removal tool of the present invention, the tool can be inserted into the annular gap without interfering with the workpiece.

The schematic diagram which shows the structure of a chip removal tool. The schematic diagram showing side surface sectional view similarly. The schematic diagram showing the AA cross section view of FIG. The schematic diagram which shows the effect | action of a chip removal tool.

The structure of the chip removal tool 100 is demonstrated using FIG. 1 thru | or FIG.
In addition, in FIG. 1, the structure of the chip removal tool 100 is typically represented by the perspective view. Moreover, in FIG. 2, the structure of the chip removal tool 100 is typically represented by the side surface sectional view. Furthermore, in FIG. 3, the structure of the chip removal tool 100 is typically represented by a planar cross-sectional view (AA cross-sectional view of FIG. 2). In the following, description will be given according to the axial direction, radial direction, and circumferential direction described in FIGS. 1 to 3.

  The chip removal tool 100 is an embodiment according to the chip removal tool of the present invention. The chip removal tool 100 of this embodiment is a tool for removing chips remaining in an annular gap S formed around a stem guide W1 provided in a cylinder block W2 of an engine.

  The chip removing tool 100 includes a fitting part 10, an expansion / contraction part 20, and a ring-shaped elastic body 30.

  The fitting part 10 is fitted into the annular gap S. The fitting portion 10 is configured in a substantially cylindrical shape and is configured from a plurality of fitting pieces 11. The fitting piece 11 is obtained by dividing the substantially cylindrical fitting portion 10 into substantially equal angles in the circumferential direction in plan view.

  The fitting portion 10 of the present embodiment is configured by combining three fitting pieces 11 forming an arc of approximately 120 ° in a plan view so as to have a substantially cylindrical shape. As described above, the fitting portion 10 is formed in a substantially cylindrical shape and is divided into a plurality of fitting pieces 11, 11.

  An annular elastic body 30 is wound in the circumferential direction from the upper part in the axial direction of the fitting part 10 to the substantially central part. Two annular elastic bodies 30 are wound around the fitting portion 10 of the present embodiment in the circumferential direction, and each fitting piece 11, 11... Is attached radially inward by the annular elastic bodies 30. It is energized.

  In the lower part of each fitting piece 11, one side end portion in the circumferential direction (in this embodiment, a clockwise positive direction side end portion (hereinafter referred to as a positive side end portion in plan view)) A scraping portion 15 extending in one direction is formed. The scraping portion 15 is formed from the midway portion in the axial direction of the fitting piece 11 to the lower end.

  One end surface in the circumferential direction of the fitting piece 11 forming the scraped portion 15 is inclined with respect to the axial direction, and the inclination angle with respect to the axial direction increases as it goes downward. Further, the angle formed between the lower end portion of the scraping portion 15 and the lower end surface of the fitting piece 11 is formed to be an acute angle. In the present embodiment, the angle is formed to be approximately 60 °. Yes.

  An opening 16 is formed at the other end portion in the circumferential direction at the lower portion of each fitting piece 11 (in this embodiment, the end portion in the clockwise negative direction (hereinafter referred to as the negative side) in plan view). Has been. The opening 16 is formed by cutting out the side surface at the other end portion in the circumferential direction of the fitting piece 11.

  In the opening part 16, it forms so that the notch amount toward the one side from the other edge part of the circumferential direction may become large as it goes below. The opening 16 is formed from the middle part in the axial direction of the fitting piece 11 to the lower end.

  The scraped portion 15 of one fitting piece 11 and the opening 16 of the other fitting piece 11 in the adjacent fitting pieces 11 and 11 are substantially parallel to the lower part of the fitting piece 11 in a side view. A quadrilateral opening is formed.

  Grooves 18 are formed on the inner diameter side (inner peripheral surface) of each fitting piece 11 and from a substantially midway portion to the lower end portion in the axial direction. The groove 18 is formed so as to be substantially parallel to the axial direction.

  A groove inlet 18 </ b> A is formed at the upper end of the groove 18. The lower end portion of the groove 18 is bent to the negative side in the circumferential direction, and is formed up to the other end surface in the circumferential direction of the fitting piece 11 that forms the opening 16. And the lower end part of the groove | channel 18 is formed as the groove | channel exit 18B.

  The groove outlet 18 </ b> B is formed toward the scraped portion 15 of the fitting piece 11 adjacent in the opening 16. In other words, the groove outlet 18 </ b> B is formed toward the lower negative side in the opening 16 of the fitting piece 11.

  11 A of 1st guide parts are each formed in the upper part by the side of the internal diameter of each fitting piece 11. As shown in FIG. 11 A of 1st guide parts are the taper holes formed so that it may reduce in diameter toward the downward direction of an axial direction in the state which combined the fitting piece 11 as the fitting part 10 so that it may become a substantially cylindrical shape.

  In other words, the first guide portion 11A tapers as the inner diameter of the fitting portion 10 moves downward in the axial direction in a state where the fitting pieces 11 are combined into the fitting portion 10 so as to have a substantially cylindrical shape. It is formed in a tapered shape along the axial direction.

  The expansion / contraction part 20 reduces or increases the outer diameter of the fitting part 10 by sliding in the axial direction with respect to the fitting part 10. The expansion / contraction part 20 is comprised by the substantially cylindrical shape. The expansion / contraction part 20 is arranged coaxially with the fitting part 10 and is configured to be slidable in a direction approaching and separating from the fitting part 10.

  A second guide portion 20 </ b> A is formed below the expansion / contraction portion 20. 20 A of 2nd guide parts are formed so that it may reduce in diameter toward the downward direction of an axial direction. In other words, the lower part of the taper-shaped expansion / contraction part 20 along the axial direction, which becomes tapered toward the lower side in the axial direction, is configured as the second guide part 20A. 20 A of 2nd guide parts are comprised from the upper part of the fitting part 10 so that fitting to 11 A of 1st guide parts is possible.

  The ring-shaped elastic body 30 has an elastic force in the radial direction in plan view. The ring-shaped elastic body 30 is configured in a ring shape. The ring-shaped elastic body 30 is wound around the circumferential direction of the substantially cylindrical fitting portion 10. The annular elastic body 30 wound around the outer periphery of the annular elastic body 30 urges each fitting piece 11 radially inward.

  In the chip removal tool 100, it is assumed that compressed air is supplied to the inside of the fitting portion 10 configured in a substantially cylindrical shape by a compressed air supply device (not shown). For example, an opening can be provided in one fitting piece 11, the compressed air supply device and the opening can be connected by a hose, and compressed air can be supplied into the fitting portion 10.

The effect | action of the chip removal tool 100 is demonstrated using FIG.
In addition, in FIG. 4, the effect | action of the chip removal tool 100 is typically represented by side surface sectional view in order of FIG. 4 (A), FIG. 4 (B), and FIG. 4 (C).

  As shown in FIG. 4A, first, the operator slides the expansion / contraction part 20 of the chip removal tool 100 downward in the axial direction with respect to the fitting part 10. At this time, the second guide portion 20A of the expansion / contraction portion 20 slides in the direction close to the first guide portion 11A of the fitting portion 10 along the axial direction, and each fitting piece 11 is outside the radial direction. Move in the direction. As each fitting piece 11 moves outward in the radial direction, the fitting portion 10 is expanded in diameter.

  At this time, the urging force by the ring-shaped elastic body 30 acts radially inward on each of the fitting pieces 11, 11... Constituting the fitting portion 10 having a substantially cylindrical shape. Each of the fitting pieces 11, 11... Moves radially outward against the urging force of the annular elastic body 30.

  In addition, an operator shall expand the fitting part 10 of the chip removal tool 100 until the internal diameter of the fitting part 10 becomes larger than the outer diameter of the stem guide W1.

  Next, as shown in FIG. 4B, the operator inserts the fitting portion 10 of the chip removing tool 100 into the stem guide W1 and loosens the upper portion of the stem guide W1 (the fitting portion 10 and the stem guide W1). (With a gap between them). Furthermore, in this state, the expansion / contraction part 20 of the chip removal tool 100 is slid upward in the axial direction with respect to the fitting part 10.

  At this time, the second guide portion 20 </ b> A of the expansion / contraction portion 20 slides in the direction away from the first guide portion 11 </ b> A of the fitting portion 10 along the axial direction, and each fitting piece 11 of the annular elastic body 30. It moves inward in the radial direction by the biasing force. Each fitting piece 11 is moved inward in the radial direction in plan view, whereby the fitting portion 10 is reduced in diameter.

  Here, when the fitting portion 10 of the chip removal tool 100 is loosely fitted to the upper portion of the stem guide W1, the fitting portion 10 is reduced in diameter in a plan view, so that the fitting portion 10 becomes the stem guide. The upper part of W1 is fitted with no gap. Thereby, the channel | path enclosed by the groove | channel 18 and stem guide W1 of each fitting piece 11 is formed.

  Next, as shown in FIG. 4C, the operator moves the chip removing tool 100 downward in the axial direction until the lower end of the fitting portion 10 reaches the lower end (bottom) of the gap S. Then, the chip removal tool 100 is rotated at least once to the positive side in the circumferential direction in plan view. At the same time, the worker supplies compressed air to the inside of the fitting portion 10 by the compressed air supply device.

  At this time, the chips remaining at the lower end of the gap S are scraped by the scraping portion 15 of the fitting piece 11 that is rotated. On the other hand, a part of the compressed air supplied into the fitting portion 10 by the compressed air supply device is supplied from the groove inlet 18A into a passage formed by the groove 18 of the fitting piece 11 and the stem guide W1. The air is blown out from the groove outlet 18B toward the scraping portion 15 via the passage. In this way, the air that has passed through the groove 18 formed on the inner peripheral surface of the fitting portion 10 is blown out toward the scraping portion 15.

  The compressed air blown toward the scraping portion 15 blows off the chips scraped by the scraping portion 15 of the fitting piece 11 from the gap S to the outside of the gap S. Chips remaining at the lower end of the gap S are removed from the cylinder block W2 by being blown off from the gap S to the outside of the gap S.

The effect of the chip removal tool 100 will be described.
According to the chip removing tool 100, the fitting portion 10 can be inserted into the annular gap S without interfering with the stem guide W1.

  Conventionally, when the cylinder block W2 is a coarse material, there is a variation in the size of the annular gap S, and in a chip removal tool including a cylindrical head portion, the size of the annular gap S is small. Depending on the variation, when the head portion is inserted into the annular gap S, the head portion may interfere with the cylinder block W2, and the cylinder block W2 may be damaged.

  According to the chip removing tool 100, the second guide portion 20A of the expanding / contracting portion 20 is slid on the first guide portion 11A of the fitting piece 11 to reduce or increase the diameter of the fitting portion 10, thereby providing a stem guide. The fitting portion 10 can be inserted into the annular gap S without interfering with W1.

  In the present embodiment, the compressed air supply device supplies compressed air to the inside of the fitting portion 10 configured in a substantially cylindrical shape, and blows away chips through the groove 18. It is not limited.

  For example, it is good also as a structure which supplies a coolant into the inside of the fitting part 10 comprised by the substantially cylindrical shape with a coolant injection apparatus, and blows away chips through the groove | channel 18. FIG. In other words, any structure may be used as long as the fluid passing through the groove 18 is blown out toward the scraping portion 15 to blow off chips.

DESCRIPTION OF SYMBOLS 10 Fitting part 11 Fitting piece 11A First guide part 15 Scraping part 18 Groove 20 Expansion / contraction part 20A Second guide part 100 Chip removal tool S Gap W1 Stem guide W2 Cylinder block

Claims (2)

A chip removal tool for removing chips remaining in an annular gap formed on a workpiece,
A fitting portion that is formed in a substantially cylindrical shape that can be fitted into the annular gap, and has a scraping portion that scrapes the chips,
An expansion / contraction portion that reduces or expands the fitting portion in the radial direction;
With
The fitting portion is divided into a plurality of fitting pieces in the circumferential direction,
A groove through which fluid can pass is formed on the inner peripheral surface of the fitting portion.
Chip removal tool. The chip removal tool according to claim 1,
A biasing member that biases each fitting piece radially inward is wound around the outer periphery of the fitting portion,
The scraped portion is formed on one side in the circumferential direction of the lower end portion of the fitting piece,
The groove is formed along a substantially axial direction from a substantially central part to a lower part on an inner peripheral surface of the fitting piece,
The lower end side of the groove is formed toward the scraped portion of the adjacent fitting piece,
A tapered first guide portion along the axial direction is formed on the inner diameter side of the fitting piece,
The lower part of the expansion / contraction part can be fitted with the first guide part, and a tapered second guide part is formed along the axial direction.
With the second guide portion fitted to the first guide portion, the second guide portion is slid toward and away from the first guide portion, thereby causing the fitting portion to move in the radial direction. Shrink or expand,
Chip removal tool.

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