JPH0366562A - Honing tool - Google Patents

Abstract

PURPOSE:To absorb a misregistration between a honing head and work hole with the elastic deformation of a cylindrical body, by elastically deforming the cylindrical body with the rise of the oil pressure of the hydraulic oil of the inside of the oil chamber formed between the cylindrical body and the outer peripheral face of the honing head and press-fitting it to the inner peripheral face of the work hole of a honing grindstone. CONSTITUTION:A sliding member 6 and an oil seal 12 are pressed to a hydraulic oil 13 side by feeding air to the air chamber 19 of an air cylinder 8 and the oil pressure of the hydraulic oil 13 is raised thereby. The cylindrical body 3 is then pressed toward the outside in the diameter direction via the hydraulic oil 13 inside the oil chamber 10 by the rise of this oil pressure, the barrel part of the cylindrical body 3 is thus deformed elastically so as to spread to the outside and the honing grindstone 4 provided on the outer peripheral face thereof is press-fitted over the whole periphery of the inner peripheral face of a work hole (a). In this case the barrel part of the cylindrical body 3 is elastically deformed along the inner peripheral face of the work hole (a) even in case of the honing head 1 being displaced to the work hole (a) and the grindstone 4 is press-fitted to the work hole (a) whole periphery.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a honing tool used for honing the inner peripheral surface of a machined hole in a workpiece.

(Prior Art) Normally, when forming a machined hole in a workpiece, for example, an engine cylinder, rough poling, fine poling, and honing are sequentially performed.

Conventionally, tools for performing this type of honing process include a horn base equipped with a grindstone on the outer circumferential surface, as disclosed in, for example, Japanese Utility Model Application Publication No. 62-201652.
It is known to be slidably fitted onto an expanded rond having a tapered surface. When honing is performed using this tool, the horn base is inserted into the hole to be machined, and then the expansion rond is slid against the horn base to expand the horn base in the radial direction and tighten the grinding wheel. The horn base and the grindstone are brought into pressure contact with the inner peripheral surface of the processed hole, and in this state, the horn base and the grindstone are rotated and slid along the inner peripheral surface of the processed hole, thereby honing the inner peripheral surface. There is.

In a tool with such a configuration, in order to uniformly press the grindstone against the inner peripheral surface of the machined hole, it is necessary to ensure coaxiality with the machined hole with high precision. A means such as a floating mechanism must be provided on the machine tool side to which the tool is mounted to absorb the positional deviation with respect to the hole.

However, in order to provide means such as a floating mechanism on the machine tool side, the construction of the machine tool becomes complicated, and the machine tool is specialized for honing, making it expensive.

(Problems to be Solved) The present invention eliminates such inconveniences, can absorb positional deviation with respect to the machined hole without providing means such as a floating mechanism on the machine tool side, and allows the use of a general-purpose machine tool. The purpose of the present invention is to provide a honing tool that can be used for honing.

(Means for Solving the Problems) In order to achieve the above object, the honing tool of the present invention is a tool for honing the inner circumferential surface of a machined hole of a workpiece, and includes a hydraulic passage communicating from the inside to the outer circumferential surface. a cylindrical honing head, and an elastic material that is fixed to an outer peripheral surface of the honing head so as to be elastically deformable in the radial direction, and forms a sealed oil chamber communicating with the hydraulic passage between the honing head and the outer peripheral surface. a cylindrical body consisting of a honing stone made of abrasive grains electrodeposited on the outer circumferential surface of the core body; and a pressurizing means for elastically deforming the honing stone in the radial direction to bring the honing stone into pressure contact with the inner circumferential surface of the machined hole.

Further, the pressurizing means is provided in a sliding member that allows the hydraulic passage filled with the hydraulic oil to communicate with the oil chamber and slidably closes it, and a tool holder that is detachably attached to a general-purpose machine tool,
It is characterized by comprising a pressing means that presses the sliding member toward the hydraulic oil side to increase the hydraulic pressure of the hydraulic oil in the hydraulic passage and the oil chamber.

(Function) According to this means, when honing the machined hole, after the honing head and the cylindrical body are inserted into the machined hole, the hydraulic pressure of the hydraulic oil in the oil chamber is reduced by the pressurizing means. is upwardly bounded through the hydraulic passage, whereby the cylindrical body is elastically deformed in the radial direction, and the honing stone electrodeposited on the outer circumferential surface of the cylindrical body is pressed against the inner circumferential surface of the machined hole. Then, in the press-contact state, the honing head and the cylindrical body are rotated and slid along the inner circumferential surface of the machined hole, thereby honing the inner circumferential surface.

At this time, if the axial center of the honing head is misaligned with respect to the machined hole, the cylindrical body is elastically deformed and its axial center becomes eccentric with respect to the axial center of the honing head. Coaxiality between the shaped body and the machined hole is ensured, and the honing stone is uniformly pressed against the inner peripheral surface of the machined hole.

Further, when the pressing means includes the sliding member and a pressing means provided on a tool holder that is detachably attached to the general-purpose machine tool, the pressing means presses the sliding member toward the hydraulic fluid. As a result, the oil pressure in the oil chamber increases and the cylindrical body is elastically deformed, so by mounting the honing head on a tool holder equipped with an air cylinder, a hydraulic cylinder, etc., and using the cylinder as a pressing means , it becomes possible to perform honing of machined holes using general-purpose machine tools.

(Example) An example of the honing tool of the present invention will be described with reference to FIGS. 1 to 3. Fig. 1 is an explanatory sectional view of the tool, Fig. 2 is an explanatory cross-sectional view of the tool;
The figure is a sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is an operation explanatory diagram for explaining the operation of the tool.

In FIGS. 1 and 2, 1 is a cylindrical honing head with a hydraulic passage 2 inside, 3 is a cylindrical body made of a conductive metal elastic material fixed to the outer peripheral surface of the honing head 1, and 4 5 is a honing stone provided on the outer peripheral surface of the cylindrical body 3;
consists of a sliding member 6 slidably inserted into the hydraulic passage 2 and an air cylinder 8 provided at the tip of the tool holder 7,
This is a pressurizing means that presses the honing whetstone 4 through the cylindrical body 3 to the inner circumferential surface of the hole a to be machined in the workpiece. The honing head l is concentrically fixed to the tip of the air cylinder 8 with a plurality of bolts 9.

As shown in the first figure, the cylindrical body 3 is fitted over the honing head 1, and both ends thereof are fixed to the outer peripheral surface of the honing head 1 over the entire circumference, and the thin body between the two ends and the honing 1 and 2 between the outer peripheral surface of the head 1.
As shown in the figure, a sealed oil chamber IO is formed. A large number of grindstone grains 4a are electrodeposited on the outer peripheral surface of the cylindrical body 3 over the entire circumference, and a honing stone 4 is formed by these grindstone grains 4a. Further, the body portion of the cylindrical body 3 is elastically deformable in the radial direction.

The hydraulic passage 2 includes an axial passage 2a penetratingly formed on the axis of the honing head l as shown in FIG. A plurality of radial passages 2b are formed radially in the radial direction to the outer peripheral surface of the honing head 1.
a communicates with the oil chamber 10 at a position on the outer peripheral surface of the honing head 1 via each radial passage 2b. The distal end of the axial passage 2a is closed by a blind plug 11 fitted therein as shown in the first figure.

As shown in the first diagram, the sliding member 6 of the pressurizing means 5 is slidably inserted into the rear part of the axial direction 3Jfi passage 2a on the opposite side of the blind stopper 11 across each radial passage 2b, and its tip The rear portion of the axial passage 2a is closed off by an oil seal 12 provided at the portion. Hydraulic oil 13 is sealed in the axial passage 2a, radial passage 2b, and oil chamber 10 between the blind plug Il and the oil seal 12. , a recess 12a is formed as shown in the first figure.

As shown in the first diagram, the air cylinder 8 of the pressurizing means 5 includes a piston 14 that is slidable inside thereof on the axis of the honing head l, and a piston 14 that extends from the piston 14 toward the axial passage 2a. and a bushing rod 15 slidably extending therebetween, the tip of the bushing rod 15 protruding from inside the air cylinder 8 into the axial passage 2a and abutting the rear end of the sliding member 6, piston 1
4 is urged by a spring 17 toward a stopper 16 provided inside the air cylinder 8 at its rear side.

An air chamber 19 is formed between the stopper 16 and the piston 14 to which air is supplied from an air supply port 18 provided in the tool holder 7.

This air cylinder 8 connects the sliding member 6 to the hydraulic oil 1.
By supplying air to the air chamber 19, the bushing rod 15 is slid toward the sliding member 6 via the piston 14, thereby causing the sliding member 6 and the The oil seal 12 is pressed toward the hydraulic oil 13 to raise the hydraulic pressure of the hydraulic oil 13.

As shown in the first figure, the tool holder 7 has a shank portion 7a at its rear end that is concentric with the air cylinder 8 and the honing head 1, and allows the tool holder 7 to rotate around its axis and rotate in its axial direction. General-purpose machine tool 2 to be moved to
0 via the shank portion 7a in a detachable manner.

Next, an explanation will be given of the operation when performing the re-honing process on the ill-prepared honing tool.

In FIG. 1, when honing a machined hole a of a workpiece A, first, the shank part 7a of the tool holder 7 is mounted on the general-purpose machine tool 20 as described above, and the honing head l is It is inserted into hole a almost concentrically.

Next, by supplying air to the air chamber 19 of the air cylinder 8, the sliding member 6 and the oil seal 12 are pressed toward the hydraulic oil 13 as described above, thereby increasing the oil pressure of the hydraulic oil 13. Then, due to this increase in oil pressure, the cylindrical body 3 is pressed outward in the radial direction via the hydraulic oil 13 in the oil chamber 10, so that the body of the cylindrical body 3 protrudes outward. The honing stone 4, which is elastically deformed and provided on its outer circumferential surface, forms the machining hole a.
It is pressed against the inner circumferential surface of the entire circumference.

Thereafter, by the operation of the general-purpose machine tool 20, the honing head l is rotated together with the tool holder 7 around its axis and moved in its axial direction, and as a result, the honing stone 4 is rotated and moved along the machined hole a. honing is performed on the inner circumferential surface of the machined hole a.

At this time, if the honing head 1 is located concentrically with respect to the machined hole a, the body of the cylindrical body 3 remains concentric with the honing head 1 and is elastically deformed uniformly in the radial direction to form a honing stone. 4 is pressed against the inner peripheral surface of the machined hole a uniformly over the entire circumference, but if the honing throat 1 is misaligned with the machined hole a as shown in the third figure, for example, the cylindrical shape The trunk of the body 3 is elastically deformed along the inner circumferential surface of the machined hole a, as shown in the third diagram, and is eccentric with respect to the honing head l. Since the body of the cylindrical body 3 is uniformly pressed in the radial direction over the entire circumference by the hydraulic pressure of the hydraulic oil 13, the honing grindstone 4 is uniformly pressed against the inner peripheral surface of the machined hole a over the entire circumference.

Therefore, in this honing tool, the honing head 1
The positional deviation between the hole a and the hole a is absorbed by the elastic deformation of the body of the cylindrical body 3, and the honing process is performed with the honing stone 4 uniformly pressed against the inner circumferential surface of the hole a. Therefore, it is possible to use a general-purpose machine tool 20 that is not equipped with the floating mechanism or the like as in this embodiment.

In this embodiment, the hydraulic oil 13 of the oil seal 12
Since the recess 12a is formed in the end face of the example as described above, when the oil pressure of the hydraulic oil 13 increases as described above, the oil seal 12 is moved into the axial passage 2a by the hydraulic oil 13 through the recess 12a. It is pressed toward the circumferential surface and is firmly pressed against the inner circumferential surface, thus reliably preventing leakage of the hydraulic oil 14.

Furthermore, although the air cylinder 8 is used as the pressing means in this embodiment, it is of course possible to use other means such as a hydraulic cylinder as the pressing means.

(Effects) As is clear from the above description, according to the honing tool of the present invention, the cylindrical body provided with the honing stone on the outer circumferential surface is fixed to the outer circumferential surface of the honing head so as to be elastically deformable in the radial direction, When honing the inner circumferential surface of a machined hole in a workpiece, the hydraulic pressure of the hydraulic oil in the oil chamber formed between the cylindrical body and the outer circumferential surface of the honing head is increased by a pressurizing means, and the core portion is honed. By elastically deforming the cylindrical body, the honing stone is brought into pressure contact with the inner peripheral surface of the machined hole, and the positional deviation between the honing head and the machined hole can be absorbed by the elastic deformation of the cylindrical body. Even without providing a floating mechanism or the like on the side, the honing process can be performed by uniformly pressing the honing stone against the inner peripheral surface of the processed hole over the entire circumference.

Then, by pressing the sliding member slidably inserted into the hydraulic passage inside the honing head toward the hydraulic oil side by the pressing means to increase the hydraulic pressure of the hydraulic oil, the tool can be attached to and detached from the general-purpose machine tool. A cylinder or the like provided on the holder can be used as the pressing means, and a honing tool that can be used with a general-purpose machine tool can be provided.

[Brief explanation of drawings]

Fig. 1 is an explanatory sectional view of an example of the honing tool of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is an operation explanatory diagram for explaining the operation of the tool. be. 1... Honing head 3... Cylindrical body 4a... Grinding stone grain 6... Sliding member 8... Pressing means 13... Hydraulic oil A... Workpiece 2... Hydraulic passage 4... Honing grindstone 5... Pressure means 7... Tool holder 10... Oil chamber 20... General purpose machine tool a... Machining hole other names EirU: q

Claims (1)

[Claims] 1. A tool for honing the inner circumferential surface of a machined hole in a workpiece, comprising a cylindrical honing head equipped with a hydraulic passage communicating from the inside to the outer circumferential surface, and the honing head. a cylindrical body made of an elastic material fixed to an outer circumferential surface so as to be elastically deformable in the radial direction and forming a sealed oil chamber communicating with the hydraulic passage between the cylindrical body and the outer circumferential surface; and an outer circumferential surface of the cylindrical body. The honing stone is made up of grinding stone grains electrodeposited on the honing stone, and the hydraulic pressure of the hydraulic oil in the oil chamber is increased through the hydraulic passage to elastically deform the cylindrical body in the radial direction. A honing tool characterized by comprising: a pressurizing means for pressurizing the inner circumferential surface of the honing tool. 2. A sliding member in which the pressurizing means slidably closes the hydraulic passage filled with the hydraulic oil by communicating with the oil chamber;
A pressing means is provided on a tool holder that is detachably attached to a general-purpose machine tool, and presses the sliding member toward the hydraulic oil side to increase the hydraulic pressure of the hydraulic oil in the hydraulic passage and the oil chamber. The honing tool according to claim 1.