JP2006159347A - Small diameter honing tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small diameter honing tool with a small number of constitutional parts, simple in structure, excellent in rigidity and inexpensive. <P>SOLUTION: This small diameter honing device is furnished with a hollow cylindrical rod type tool main body 1 having a grindstone part 4 on an outer periphery and a rod type expansion rod 2 free to reciprocally move in the axial direction in a hollow cylindrical hole 3 of the tool main body 1. It is constituted by providing a ring engaging rib 5 to be engaged with an expansion rod 2 on an inner diametrical surface of the hollow cylindrical hole 3 corresponding to the grindstone part 4 of the tool main body 1 and providing a taper wedge 8 to be engaged with the engaging rib 5 on the expansion rod 2, and the grindstone part 4 of the tool main body 1 is moved to expand and contract as the taper wedge 8 is engaged with the engaging rib 5 by reciprocal movement of the expansion rod 2 in the axial direction in the inside of the tool main body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a small-diameter honing tool, and more particularly, to a honing tool structural technique that is attached to the tip of a rotating spindle of a honing machine and is suitable for honing a small-diameter workpiece hole inner diameter surface of a workpiece.

  In the honing process in which the bore diameter surface of the workpiece (hereinafter referred to as a workpiece) is finished to a mirror surface, a honing tool is attached to the tip of the rotating spindle of the honing machine, and the honing tool and the workpiece are relatively floated. While giving rotation and reciprocating motion to the honing tool, the honing tool's honing wheel is expanded by the wedge or cone of the expansion rod, and the work inner surface is precision finished.

  As honing tools having various structures according to the purpose are used, honing tools having a structure shown in FIG. 3 or 4 are known as honing tools for honing the inner diameter surface of a small-diameter processed hole. Yes.

  That is, the honing tool shown in FIG. 3 has a cylindrical body d fitted and fixed in a hollow cylindrical hole c of a hollow cylindrical rod-shaped tool body b having a grindstone portion a on the outer periphery, and the expansion rod e is hollow. It can be reciprocated in the axial direction in the cylindrical hole c.

  Then, the expansion rod e moves toward the tip end in the axial direction, and the tapered wedge f at the tip portion is forcibly inserted into the cylinder body d of the tool body b, so that the cylinder d is expanded. The grindstone part a of the tool body b is enlarged.

  Further, in the honing tool shown in FIG. 4, a columnar member h whose base end portion is an inclined wedge g is fitted and fixed in a hollow cylindrical hole c of a hollow cylindrical rod-shaped tool body b having a grindstone portion a on the outer periphery. At the same time, the expansion rod j whose tip is an inclined wedge i that engages with the inclined wedge g can be reciprocated in the axial direction in the hollow cylindrical hole c.

  Then, the expansion rod j moves to the tip end side in the axial direction, and the inclined wedge i at the tip end portion engages with the inclined wedge g of the cylindrical member h, so that both the inclined wedges g and i are in the radial direction. The grindstone part a of the tool main body b is expanded and expanded.

  However, such a conventional honing tool structure has the following problems, and an improvement thereof has been demanded.

(1) The number of component parts is large and the material cost is high, and the number of manufacturing processes such as machining of each component part and assembly of these component parts is also large, leading to an increase in manufacturing cost and further product cost.

(2) When the outer diameter dimension of the honing tool is set to a predetermined value, if the number of component parts is large, the thickness of the tool body b is limited and a sufficient thickness can be secured. As a result, there was a problem that the tool rigidity was inferior and easily damaged (short life).

  As far as the present applicant knows, there is no patent document or the like that discloses these prior arts.

 The present invention has been made in view of such conventional problems, and an object thereof is to provide an inexpensive small-diameter honing tool having a small number of components, a simple structure, and excellent rigidity. It is in.

  In order to achieve the above object, a honing tool according to the present invention is a honing tool that is attached to the tip of a rotating spindle of a honing machine and that performs a honing process on the inner diameter surface of a small-diameter workpiece hole of a workpiece, and has a grindstone portion on the outer periphery A hollow cylindrical rod-shaped tool body and a rod-shaped expansion rod that can reciprocate in the axial direction in the hollow cylindrical hole of the tool body are provided on the inner diameter surface of the hollow cylindrical hole corresponding to the grindstone portion of the tool body. An annular engagement rib that engages with the extension rod is provided, and a tapered wedge that engages with the engagement rib is provided on the extension rod, and the extension rod reciprocates in the tool body in the axial direction. By moving, the taper wedge engages with the engagement rib, and the grindstone portion of the tool body is expanded and contracted. To.

  In a preferred embodiment, the tool body is formed of a cylindrical metal pipe, and the engagement rib of the material is formed by drawing the metal pipe.

  The hollow cylindrical bore inner diameter surface corresponding to the grindstone portion of the tool body is provided with a single annular engagement rib, and a plurality of the annular engagement ribs are provided at predetermined intervals according to the purpose. In this case, the inner diameters of the plurality of annular engagement ribs are set corresponding to the taper of the outer peripheral surface of the tapered wedge of the expansion rod, and all the annular engagement ribs simultaneously abut and engage with the tapered wedge. Configured as follows.

  Furthermore, the taper wedge of the expansion rod has a tapered surface whose diameter gradually increases from the distal end toward the proximal end.

  Further, it is desirable that at least a grinding slit for assisting the expansion / contraction operation of the grinding wheel portion is formed extending in the axial direction in the grinding stone portion of the tool body.

  Moreover, the grindstone part of the said tool main body is suitably equipped with the grindstone surface by which a fine abrasive grain is electrodeposited on the outer peripheral surface of a tool main body.

  According to the honing tool of the present invention, it is composed of a hollow cylindrical rod-shaped tool body and a rod-shaped expansion rod that is reciprocally movable in the hollow cylindrical hole of the tool body in the axial direction. Is obtained.

(1) The number of components is small, the material cost is reduced, the number of manufacturing steps is also small, and the manufacturing cost and the product cost can be reduced.

(2) Because the number of component parts is small, the outer diameter of the honing tool is set to a predetermined value, but the thickness of the tool body can be secured to a sufficient level, and the tool rigidity is excellent. It is possible to provide a honing tool that is hard to break and has a long service life.

  As a synergistic effect due to the effects (1) and (2), the running cost in the honing process can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1
A honing tool according to the present invention is shown in FIG. 1, and this honing tool is specifically attached to a honing machine, and honing is performed on the inner diameter surface of a small hole to be machined. The expansion rod 2 has a two-point configuration composed of two components.

  The tool main body 1 is formed of a straight rod-shaped small-diameter hollow cylinder, and has a hollow cylindrical hole 3 inside thereof and a grindstone portion 4 provided on the outer periphery thereof. Although not specifically shown, the base end portion (upper end side in FIG. 1) of the tool main body 1 has a conventionally known structure that is detachably attached to the tip of the main spindle of the honing machine. For example, the tool main body 1 is attached to the rotating main shaft by fixing a base end shank portion (not shown) of the tool main body 1 to the chucking portion of the lower end mounting portion of the rotating main shaft. The tip 1a of the tool body 1 is a tapered tapered pilot as shown in the drawing so that the work can be smoothly and reliably entered into the hole to be machined.

  Specifically, the tool main body 1 is formed of a cylindrical metal pipe made of a metal material having elasticity and strength enough to repeat a grindstone expansion / contraction operation described later.

  An annular engagement rib 5 is provided on the inner surface of the hollow cylindrical hole 3 corresponding to the grindstone portion 4 of the tool body 1 in order to expand and contract the grindstone portion 4 in cooperation with the expansion rod 2 as will be described later. ing.

  Specifically, the annular engagement rib 5 is disposed substantially at the center in the axial direction of the grindstone portion 4 as shown in the figure, and the tool main body 1 is formed of a cylindrical metal pipe. Drawing is preferably employed. The pilot portion 1a is similarly formed by drawing. The cross-sectional shape of the distal end portion 5a of the engagement rib 5 is preferably formed in a curved shape such as an arc so as to ensure a contact engagement area with the expansion rod 2 as large as possible.

  Further, in order to assist the expansion / contraction operation of the grindstone portion 4, at least the grindstone portion 4 of the tool body 1 is formed with an expansion / contraction slit 7 extending in the axial direction. The expansion / contraction slits 7 are desirably provided in a plurality of equal positions in the circumferential direction in the cylindrical cross section of the tool body 1 so that a substantially uniform expansion / contraction operation is ensured over the entire grindstone portion 4, and the lengths of the slits 7 are also determined. It is set corresponding to the thickness of the main body 1.

  In the illustrated embodiment, two expansion / contraction slits 7 are provided at a position on one diameter line in the cylindrical cross section of the tool main body 1 and, as shown in FIG. It is provided so as to extend long on both the upper and lower sides, whereby a substantially uniform expansion / contraction operation in the radial direction is ensured over the entire grindstone portion 4.

  The expansion rod 2 is a rod-shaped member that cooperates with the annular engagement rib 5 to expand and contract the grindstone portion 4 and can reciprocate in the hollow cylindrical hole 3 of the tool body 1 in the axial direction.

  The end of the expansion rod 2 is a tapered wedge 8 as shown in the drawing, and the tapered wedge 8 is configured to engage with the engaging rib 5 of the tool body 1.

  In the illustrated embodiment, the taper wedge 8 has a tapered surface whose diameter gradually increases from the distal end toward the proximal end, and is caused by the protruding operation (in the direction of the arrow A) of the expansion rod 2. When the taper wedge 8 is engaged with the annular engagement rib 5 of the tool body 1, the annular engagement rib 5 is expanded outwardly in the radial direction, and the grindstone portion 4 of the tool body 1 is enlarged. To do. On the other hand, the taper wedge 8 moves in the direction in which the engagement with the annular engagement rib 5 of the tool main body 1 is released by the retraction operation of the expansion rod 2 (arrow B direction), so that the elasticity of the tool main body 1 is achieved. Due to the restoring force, the annular engagement rib 5 and the grindstone 4 are contracted.

  Although not specifically shown, the main body portion of the expansion rod 2 following the taper wedge 8 is in the form of a cylindrical bar having the same size as the outer diameter of the base end of the taper wedge 8, and its base end (shown in the figure). (Omitted) is a structure capable of adjusting the axial position of the expansion rod 2. This adjustment structure is a conventionally known structure and includes a connection structure that is drivingly connected to a grindstone driving device of a honing machine to be mounted.

  The expansion rod 2 of the illustrated embodiment has a connection structure that is drivingly connected to a grinding wheel drive device of a honing machine. Specifically, the expansion rod 2 of the honing machine has a cutting drive mechanism of the grinding wheel drive device inside the rotation main shaft of the honing machine. A pressing rod is provided so as to be capable of reciprocating in the axial direction, and a proximal end of the expansion rod 2 is connected to a distal end of the pressing rod.

  Thus, the honing tool configured as described above is mounted on the rotating spindle of the honing machine, and the honing tool and the workpiece are relatively floated (for example, the workpiece is kept floating). . The honing tool is inserted into the work hole of the workpiece in accordance with the operation of the rotating spindle while the grindstone portion 4 is expanded by the taper wedge 8 of the expansion rod 2 in the above-described manner. At the same time, precision finishing is performed on the inner surface of the hole to be machined while being rotated and reciprocated.

  When processing workpieces having different shapes and dimensions, a setup operation, that is, when the expansion adjustment of the grindstone portion 4 by the expansion rod 2 is performed, in this embodiment, by the grindstone driving device of the honing machine to be mounted, The expansion rod 2 is adjusted by moving forward and backward. That is, when the expansion rod 2 reciprocates (advances and retreats) in the tool body 1 in the axial direction, the taper wedge 8 engages with the engagement rib 5 of the tool body 1, and the grindstone portion 4 expands and contracts. Operated (adjusted).

  As described above, the honing tool according to the present embodiment has a two-point configuration including the tool body 1 and the expansion rod 2, so that the number of components is small, thereby reducing the material cost and manufacturing. The number of processes is small, and the manufacturing cost and the product cost can be reduced.

  Further, the outer diameter dimension of the honing tool, that is, the outer diameter dimension of the tool body 1 is set to a predetermined value. However, if the number of component parts is small as described above, the thickness of the tool body 1 is structurally increased in strength. The honing tool can be secured to a sufficient extent, and thereby, a honing tool having excellent tool rigidity, being hard to break and having a long life can be configured.

  Furthermore, as a synergistic effect of these two effects, that is, as a honing tool that is a consumable part in honing processing, it is possible to provide a structure having a low product cost and a long life, thereby reducing the running cost in honing processing. it can.

Embodiment 2
This embodiment is shown in FIG. 2, and the specific structure of the tool body 1 of the first embodiment is slightly modified.

  That is, in the tool body 1 of the honing tool of the present embodiment, a plurality of annular engagement ribs 5 that cooperate with the expansion rod 2 are provided at predetermined intervals on the inner diameter surface of the hollow cylindrical hole 3 corresponding to the outer grindstone portion 4. ing.

  The specific number and position of the annular engagement ribs 5 are appropriately set in consideration of the length of the grindstone 4 and the like according to the purpose. By increasing the number of the annular engagement ribs 5 disposed, the uniformity of the expansion / contraction operation over the entire grindstone portion 4 is increased, and the contact of the workpiece with the inner surface of the hole to be machined is substantially the entire surface contact with the grindstone portion 4. And stable honing can be ensured.

  In the illustrated embodiment, two annular engagement ribs 5 (5a, 5b) are provided, and the arrangement locations thereof are shown so that a uniform expansion / contraction operation can be ensured over the entire grindstone portion 4 described above. 2 is set.

  In relation to this, the inner diameters of the annular engagement ribs 5a and 5b are set corresponding to the taper of the outer peripheral surface of the tapered wedge 8 of the expansion rod 2, and all the annular engagement ribs 5 are connected to the tapered wedge 8 described above. At the same time. Specifically, the inner diameter end portions of the annular engagement ribs 5a and the annular engagement ribs 5b arranged at a predetermined interval are brought into contact engagement with the tapered surface of the tapered wedge 8 at the same time and with substantially the same contact force. As described above, the inner diameters of the annular engagement rib 5a and the annular engagement rib 5b are set corresponding to the taper angle of the tapered taper wedge 8, respectively.

Thus, in the honing tool configured as described above, the expansion rod 2 projects in the direction of the arrow A, and the tapered wedge 8 simultaneously engages with the annular engagement ribs 5a and 5b of the tool body 1. As a result, the annular engagement ribs 5a and 5b are expanded outward in the radial direction and bulge out, and the entire grindstone portion 4 of the tool body 1 is expanded while maintaining a substantially uniform outer diameter. On the other hand, the expansion rod 2 moves back and forth in the direction of the arrow B, and the taper wedge 8 moves in a direction in which the engagement with the annular engagement ribs 5a and 5b of the tool body 1 is released. Due to the elastic restoring force, the entire grindstone 4 is shrunk while maintaining a substantially uniform outer diameter.
Other configurations and operations are the same as those of the first embodiment.

  The above-described embodiment is merely a preferred embodiment of the present invention, and the present invention is not limited thereto, and various design changes can be made within the scope.

1 shows a honing tool according to a first embodiment of the present invention, FIG. 1 (a) is a front view, and FIG. 1 (b) is a front view showing an incision of a tool body. The honing tool which is Embodiment 2 of this invention is shown, FIG. 2 (a) is a front view, FIG.2 (b) is a front view which cuts and shows a tool main body. An example of a conventional honing tool is shown, in which FIG. 3 (a) is a front view of the main part, and FIG. 3 (b) is a front view of the main part shown by cutting the tool main body. FIG. 4A is a front view of the main part, and FIG. 4B is a front view of the main part shown in the same manner by cutting the tool main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tool main body 2 Expansion rod 3 Hollow cylindrical hole of tool main body 4 Grinding stone part 5, 5a, 5b of tool main body Annular engagement rib 7 of tool main body Slit for expansion / contraction 8 Taper wedge

Claims (6)

A honing tool that is attached to the tip of a rotating spindle of a honing machine and that performs a honing process on the inner diameter surface of a small-diameter processed hole of a workpiece,
A hollow cylindrical rod-shaped tool body having a grindstone portion on the outer periphery, and a rod-shaped expansion rod that can be reciprocated in the axial direction in the hollow cylindrical hole of the tool body,
An annular engagement rib that engages with the expansion rod is provided on the inner diameter surface of the hollow cylindrical hole corresponding to the grindstone portion of the tool body, and a tapered wedge that engages with the engagement rib is provided on the expansion rod. And
When the expansion rod reciprocates in the tool body in the axial direction, the taper wedge engages with the engagement rib, and the grindstone portion of the tool body is expanded and contracted. Features a small diameter honing tool. The small diameter honing tool according to claim 1, wherein the tool main body is formed of a cylindrical metal pipe, and the engagement rib of the material is formed by drawing the metal pipe. A plurality of the annular engagement ribs are provided at predetermined intervals on the inner surface of the hollow cylindrical hole corresponding to the grindstone portion of the tool body,
The inner diameters of these annular engagement ribs are set corresponding to the taper of the outer peripheral surface of the taper wedge of the expansion rod, and all the annular engagement ribs are configured to simultaneously abut and engage with the taper wedge. The small diameter honing tool according to claim 1, wherein the small diameter honing tool is provided. The small-diameter honing according to any one of claims 1 to 3, wherein the taper wedge of the expansion rod has a tapered surface whose diameter gradually increases from the distal end toward the proximal end. tool. The small diameter according to any one of claims 1 to 4, wherein an expansion / contraction slit for assisting an expansion / contraction operation of the grindstone portion extends in the axial direction at least in the grindstone portion of the tool main body. Honing tool. The small diameter honing tool according to any one of claims 1 to 5, wherein the grindstone portion of the tool main body includes a grindstone surface in which fine abrasive grains are electrodeposited on the outer peripheral surface of the tool main body.

Images