JPH02237762A - Honing head - Google Patents

Abstract

PURPOSE:To execute the precise finishing of the internal face of a cylinder by one working, by roughening the abrasive grain of the tip side of the scaled grindstone fitting part screwed with the thread part of a wedge like taper part, thinning the abrasive grain of a main body side and also arranging plural annular grindstones so that the outer diameter becomes larger in gradation toward the main body side from the tip. CONSTITUTION:A thread part 6 and wedge like taper part 7 are bonded via a universal joint 2 to the main body fitting part 1 of a honing head. To this thread part 6, a cylindrical grindstone fitting part 13 is screwed, which has four annular grindstones arranged so that the outer diameter becomes larger in gradation in the order of a rough grinding grindstone 8, medium rough grind ing grindstone 9, medium finishing grindstone 10 and finishing grindstone 11 from the tip thereof and marked with the scale in the axial direction at the outside. The work diameter of the grindstone is set by tightening or loosening the screw of this grindstone fitting part 13 and reading the scale 14 of a grooved cylinder 16 and the scale of the grindstone fitting part 13. The internal face of the cylinder is subjected to precise finishing in this state.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a honing head for a honing machine used for precision finishing the inner surface of a cylinder.

[Conventional technology]

Mainly precision finishing of cylindrical inner surfaces, such as hydraulic cylinders. Honing machines are used to finish the cylinders of hydraulic machines, automobiles, aircraft, compressors, etc. There are two types of honing machines: vertical and horizontal, but the vertical type is most commonly used. The configuration of a honing head that performs honing by rotating the head and applying vibration in the axial direction will be described based on the drawings. FIG. 3 is a configuration diagram of a conventional honing head, and FIG. 4 is a longitudinal sectional view of FIG. 3. The top of the honing head is a body attachment part 1 that can be connected with a drill chuck, and the honing head can be machined even if the center of the inner surface of the cylinder to be machined and the center of the honing head are slightly misaligned beyond the body attachment part 1. The universal joint 2 is connected so that Diamond abrasive grains or CBN (cubic boron nitride) abrasive grains are electrodeposited or adhered to the outer periphery of the honing head to constitute a whetstone 3. The inside of the grindstone attaching part 13 that holds the grindstone is wedge-shaped, and a tapered part 7 for adjusting the diameter of the grindstone 3 and an adjusting pin 4 equipped with a screw can be inserted from the bottom. There is a male thread cut into the tip of this adjustment pin. To adjust the diameter of the grinding wheel 3, fit the adjusting screw 5 into the thread of the adjusting pin 4, and pull out the adjusting screw 5 on a bench or the like or drive it in with a hammer or the like to adjust the diameter of the grinding wheel 3.
The diameter can be adjusted. While adjusting the diameter of the grindstone 3 in this manner, the outer diameter of the grindstone 3 is measured with a micrometer and the machining diameter is set. Furthermore, when polishing the inner surface of a cylinder to a mirror finish, the current practice is to hone the honing head by changing the honing head many times in descending order of the abrasive grain size.

[Problems to be Solved by the Invention] Modern machining requires precision down to the μm level. For this purpose, the diameter of the grinding wheel 3 is set to μ using the adjustment screw 5.
It is very difficult and almost impossible to set up to m units. Further, in a honing head where the diameter of the grindstone 3 is small, there is a problem that the adjustment pin 4 may be bent or broken. Furthermore, when mirror-finishing the inner surface of a cylinder, it is necessary to replace the honing head many times, which poses a problem in that the machining time is long. This invention allows precision finishing of the inner surface of a cylinder with a single honing process. To provide a honing head capable of sharpening and easily measuring the outer diameter of a grindstone 3 without measuring with a micrometer.

[Means to solve the problem]

The above purpose is to set a machining diameter by moving a wedge into a grinding wheel attachment part that is connected to the main body of a honing machine via a universal joint and holding a grinding wheel to expand or reduce the outer diameter of the grinding wheel, In a honing head for precision finishing the inner surface of a cylinder, a wedge-shaped taper part is connected to the universal joint and placed at the tip of a threaded part, which is screwed into the threaded part, and the tip side thereof is a sharpening part. It is equipped with multiple annular grindstones arranged so that the grains are coarse and the abrasive grains are finer on the main body side, and the outer diameter gradually increases from the tip to the main body side, and there is an axial scale on the outside. A honing head consisting of a carved whetstone attachment part and a grooved cylindrical part, which is arranged on the outer diameter side of the threaded part and the whetstone attachment part, has a plurality of axial grooves and has a circumferential scale carved into the tip. achieved.

[For use]

A wedge-shaped tapered part is connected to the universal joint and placed at the tip of the threaded part, and is screwed into the threaded part, so that the abrasive grains are rough on the tip side and finer on the main body side. , and the honing finish is performed using a grindstone attachment part with a plurality of annular grindstones arranged so that the outer diameter increases stepwise from the tip to the main body side, and an axial scale is carved on the outside. The inner surface of the cylinder can be precisely finished by machining. In addition, if you read the scale on the whetstone attachment part and the scale on the grooved cylindrical part placed on the outside diameter side of this whetstone attachment part, you can determine the outside diameter of the whetstone by μ.
Can be set in meters. Furthermore, the plurality of grooves cut into the grooved cylindrical portion allow grinding oil to flow efficiently during honing, thereby preventing clogging of the grindstone.

【Example】

Embodiments of the present invention will be described below based on the drawings. 1st
The figure is a configuration diagram of a honing head according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of FIG. 1. Figures 1 and 2
In the figure, the same parts as in FIGS. 3 and 4 are given the same numbers. A threaded portion 6 and a wedge-shaped tapered portion 7 are connected to a main body attachment portion l of the honing head via a universal joint 2. On this threaded part 6, there are four annular wheels arranged so that the outer diameter increases stepwise in the order of a rough-cutting grindstone 8, a medium-roughing grindstone 9, and a medium-finishing grindstone 103 from the tip. A cylindrical grindstone attachment part 13 having a grindstone and having an axial scale carved on the outside is screwed together with a female thread. This grindstone attachment part 13 has a split end in the axial direction, and is configured to expand or contract. Furthermore, a plurality of axial grooves 15 are provided on the outside of the threaded portion 6 and the grindstone attachment portion 13 to allow grinding oil to flow smoothly;
A grooved cylindrical portion l6 having a circumferential scale l4 carved therein is attached to the tip. The grindstone attachment part 13 is screwed into the threaded part 6, and when the screw of the grindstone attachment part 13 is tightened, the grindstone attachment part 13 is pushed into the taper part 7, and the diameter of the grindstone is expanded. Conversely, when the screw of the grindstone attachment part 13 is loosened, the grindstone is pulled out from the tapered part 7 and the diameter of the grindstone is reduced. When tightening or loosening the screw of the grindstone attachment part 13, the machining diameter can be set by reading the scale 12 of the grindstone attachment part 13 and the scale l4 of the grooved cylinder 16. Furthermore, during machining, when grinding oil is flowed from the grooved cylindrical portion 16, the oil flows downward along the grooves 15, washing away chips that have been scraped and adhered to the grindstone.

【Effect of the invention】

A wedge-shaped tapered part placed at the tip of the threaded part is screwed into the threaded part, and the abrasive grains are coarse on the tip side and fine on the main body side, and from the tip to the main body side. It has a plurality of annular grindstones arranged so that the outer diameter increases stepwise toward the center, and a grindstone attachment part with axial scales carved on the outside, and a threaded part and a grindstone attachment part arranged on the outer diameter side of the grindstone attachment part. ,
Since the honing head is composed of a grooved cylindrical part having a plurality of axial grooves and a circumferential scale carved into the tip, a. The inner surface of a cylinder can be precisely finished in one process without replacing the grindstone. mouth. By flowing the grinding oil through the grooves of the grooved cylindrical part during machining, the ground chips are washed away, eliminating clogging on the surface of the grindstone and making the abrasive grains always sharp cutting edges. C. By reading the scale on the grindstone attachment part and the scale on the grooved cylindrical part, you can determine the machining diameter μ without using a micrometer.
Can be set in meters.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a honing head according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of Fig. 1, Fig. 3 is a block diagram of a honing head according to a conventional example, and Fig. 4 is a longitudinal cross-section of Fig. 3. It is a front view. 2: Universal joint, 6: Threaded part, 7: Tapered part, 8: Roughing grindstone, 9: Medium cutting grindstone, 10: Medium finishing grindstone, l1: Finishing grindstone, 12, 14: Scale, 13
: Grindstone attachment part, 15: Groove, 16: Grooved cylindrical part.

Claims (1)

[Claims] 1) Set the machining diameter by moving a wedge into the grinding wheel attachment part that is connected to the main body of the honing machine via a universal joint and holding the grinding wheel to expand or reduce the outer diameter of the grinding wheel, and set the machining diameter. In the honing head for precision finishing, there is a wedge-shaped taper part connected to the universal joint and placed at the tip of the threaded part, and a wedge-shaped tapered part that is screwed into the threaded part and has a rough abrasive grain on the tip side. The main body side has multiple annular grindstones arranged so that the abrasive grains become finer and the outer diameter gradually increases from the tip to the main body side, and the outer diameter of the grindstone is carved with axial scales. A honing comprising: an attachment part; and a grooved cylindrical part that is arranged on the outer diameter side of the threaded part and the grindstone attachment part, has a plurality of axial grooves, and has a circumferential scale carved in the tip. head.