JPH02250764A - Horning method - Google Patents

Abstract

PURPOSE:To sharply reduce the facility cost and device space by horning a work with one kind of a grindstone, changing and controlling the stroke position of a horning head to the position where horning can be performed with another kind of a grindstone, and horning the same work with two or more kinds of grindstones. CONSTITUTION:When grindstones are machined to the preset rough horning size, a rough horning drive stopping command is issued by the fixed size detecting action of an air nozzle 51, and grindstones 12 and 13 are shrunk by the ascent of a rod 23. The piston 43 of a stroke cylinder 42 is largely lowered by a grindstone changing command, and the stroke position of a horning head 11 is changed to the position where the inner periphery of a work W can be horned by the finishing grindstone 13. The grindstone expansion, grindstone rotation, and stroke action between an upper limit setter 48 and a lower limit setter 49 are again commanded, and the finishing horning by the finishing grindstone 13 is performed.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a honing method.

(Prior art) Conventionally, when honing the same workpiece in multiple different processes, such as rough honing and finish honing, a honing head equipped with a rough honing whetstone and a horn head equipped with a finishing whetstone are used. Honing can be carried out using a multi-axis honing machine equipped with
Honing is performed by alternately mounting a rough whetstone and a finishing whetstone on the same circumference of one honing head, and driving each of them to expand alternately using a two-stage expansion device.

(Problems to be Solved by the Invention) When honing is performed using the plurality of axes, the workpiece must be moved to each axis position, and there is a problem in that the equipment cost increases as the number of axes increases. In addition, honing by alternating expansion drive using a two-stage expansion device does not require moving the workpiece, but the structure of the horn head is complicated and the expansion device requires two stages of drive on the same axis. Moreover, the control is complicated and the equipment cost is high. moreover,
When different types of grindstones are mounted on the same circumference in this way, the distance between the same type of grindstones increases, resulting in poor processing accuracy and poor efficiency.

An object of the present invention is to provide an inexpensive honing method that does not complicate the device structure and control.

[Structure of the Invention (Means for Solving the Problems) The present invention provides a honing method in which honing is performed using different types of grindstones 12, H mounted in multiple stages in the axial direction of a hollow cylindrical honing head 11. After honing the workpiece W with one type of grindstone 12, the stroke position of the honing head 11 is controlled to be converted to a position where it can be honed with another type of grindstone 13, and two types of the same workpiece W are honed. Above whetstone 12. This is a honing method in which honing is performed using H.

(Function) In the present invention, after honing a workpiece with the grindstone 12 for rough honing, for example, by moving the honing head 11 in the axial direction, the grindstone 12 for finish honing
3 facing the workpiece W and finish honing is performed.

(Examples) Hereinafter, the present invention will be described in detail with reference to examples shown in the drawings.

A rough whetstone 12 and a finishing whetstone 13 are mounted in two stages on a honing head 11 that is rotatably and vertically movable. Each grindstone 12, 13 is fitted into a hole drilled in the honing head 11 so as to be movable in the radial direction.

Each whetstone +2. H is expanded or contracted by the same grinding wheel expansion device 14. Examples of the grindstone expansion device 14 include the illustrated hydraulic expansion device or mechanical expansion device.

In the illustrated hydraulic expansion device, a cylinder 21 is integrally provided at the upper end of the honing head 11.
A piston 22 is fitted into the honing head 11 so as to be movable up and down, and a rod 23 integrated with the piston 22 is attached to the honing head 11.
A cone 24 for a rough whetstone is integrally provided at the lower end of the rod 23, a cone 25 for a finishing whetstone is integrally provided at the middle stage of the rod 23, and a cone 24 for a finishing whetstone is integrally provided at the middle stage of the rod 23. .25 is the taper part 26 of each grindstone 12.13
．． 27 is fitted.

Then, when the piston 22 is lowered by the fluid pressure supplied to the cylinder 21, the cones 24.25 are pushed down via the rod 23, and each of the corresponding grindstones 12.25 is pushed down.
13 is expanded and, conversely, when the piston 22 is raised, the cone 24. 25 is pulled up and each corresponding grinding wheel 12, 13 is retracted.

A gear 31 is integrally provided at the upper end of the honing head 11, and a gear 33 of an output shaft of a rotary drive motor 32 is meshed with this gear 31. A circumferential groove 34 is formed on the lower side of the gear 31.

One end of a connecting plate 41 is rotatably fitted into the circumferential groove 34, and the intermediate portion of a rod 44 integral with the piston 43 of the stroke cylinder 42 is coupled to the other end of the connecting plate 41. A stroke dock 45 is provided at the upper end of this rod 44. The dock 45 is provided with an upper limit setter 46 and a lower limit setter 47 of the rough honing stroke control device, and an upper limit setter 48 and a lower limit setting fl! of the finish honing stroke control device. 4
9 are arranged.

Further, above the rough grindstone 12, the honing head 11 is provided with an air nozzle 51 as a sizing means, and an air supply pipe (not shown) is connected to the air nozzle 51. And this air nozzle 51
Air is blown onto the machined surface of the workpiece W, and the dimensions of the machined surface are measured by detecting changes in the back pressure of the air supply pipe, and a set constant dimension is detected.

Next, the operation of this embodiment will be explained.

First, as shown in FIG. 1, the honing head 11 is inserted into the workpiece W, and at a position where the rough whetstone 12 fits into the inner peripheral surface of the workpiece W, commands for grindstone expansion, grindstone rotation, and stroke are given. The rough whetstone 12 is expanded by pressing down the cone 24 of the whetstone expansion device 14, the honing head 11 is rotated by the rotary drive motor 32, and the honing head 11 is moved between the upper limit setter 46 and the lower limit setter 47 by the stroke cylinder 42. The shaft is moved axially between the holes and rough honing is performed.

When the rough honing dimension is adjusted to the preset rough honing dimension, a rough honing drive stop command is issued by the sizing detection function of the air nozzle 51, and the rod 23 is raised to stop the grinding wheel. 2. H is contracted.

Subsequently, the piston 43 of the stroke cylinder 42 is thickened (lowered) by the grindstone conversion command, and as shown in FIG. This is converted to a position where it is possible, and commands are again given to extend the grinding wheel, rotate the grinding wheel, and stroke operation (up and down movement) between the upper limit setter 48 and the lower limit setter 49, and finish honing is performed using the finishing whetstone 13. be exposed.

Then, when the set finish honing dimension is reached, a finish honing drive stop command is issued by a timer fixed size device (not shown), and the honing head 11 is moved to the workpiece W.
retreat from and leave.

Note that the sizing means for rough honing is the air nozzle 5.
Instead of the air sizing device using No. 1, other sizing means such as a timer sizing device may be used.

Similarly, the sizing means for finish honing may be replaced by other sizing means such as air sizing using an air nozzle or plug sizing, instead of the timer sizing device.

[Effects of the Invention] According to the present invention, different types of grindstones mounted in multiple stages in the axial direction of the honing head are selectively used by converting and controlling the stroke position of the honing head. Since it is easy to control the position at multiple locations using numerical control, etc., compared to the conventional honing method using multiple axes or the honing method using a two-stage expansion device, it is possible to use a relatively simple honing head structure and grindstone. The honing method of the present invention can be carried out by the expansion means, and equipment costs and equipment space can be significantly reduced, and stable honing can be performed. moreover,
Grinding wheels that are installed separately for each type in the axial direction of the honing head make it possible to set the pitch between the same type of grinding stones closer than when different types of grinding wheels are installed alternately on the same circumference. This makes it possible to improve machining accuracy and efficiency.

[Brief explanation of drawings]

Fig. 1 is an example of a honing device for implementing the honing method of the present invention, and Fig. 1 is a cross-sectional view during machining with a rough whetstone;
The figure is a cross-sectional view during processing using a finishing whetstone. 11...Honing head, 12...Rough whetstone, 13...
Finishing whetstone, W...workpiece.

Claims (1)

[Claims] (1) A honing method in which honing is performed using different types of grindstones installed in multiple stages in the axial direction of a hollow cylindrical honing head, and after honing a workpiece with one type of grindstone, the honing head A honing method in which the same workpiece is honed using two or more types of grindstones, by converting and controlling the stroke position of the same workpiece to a position where it can be honed with another type of grindstone.