Honing method and honing machine

Abstract

A honing processing technology for making uniform the load applied to honing grindstones by cooperating the reciprocal motion of the honing grindstones with the feeding and expanding motion at high precision by a specified relation. Servo motors are used as drive sources respectively for spindle reciprocal drive part and grindstone depth cutting part, and these two servo motors are mutually cooperated, and the feeding and expanding motion of the honing grindstones is controlled to be synchronized and tuned with the ascending and descending (reciprocal) motion of the honing tool so that the processing load applied to the honing grindstones may be averaged. Hence, without modifying the basis existing mechanical elements, the load applied to the honing grindstones may be averaged, and the honing process may be stabilized in precision and enhanced in precision.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a honing method and a honing machine, and more particularly to a honing technology of honing while feeding a honing grindstone by force at a specified depth of cut mechanically to the inner circumference of a workpiece.[0003]2. Description of the Related Art[0004]Honing process is known as one of the processing methods of finishing the inner circumference of a workpiece (or work) to a mirror-smooth surface. In this honing process, the honing grindstone and the work are set in a relatively floating state, and the honing grindstone is driven by rotary motions and reciprocal motions, and the honing grindstone is expanded by spring repulsive forces to finish the inner circumference of the work precisely.[0005]In the conventional honing process, the honing grindstone was pressed against the work by a specific force (spring repulsive force), and the inner circumference of the work was cut off ...

AI Technical Summary

Benefits of technology

[0012]It is other object of the invention to present a honing technology capable of stabilizing the precision and enhancing the precision of honing process, in the honing process of forced depth setting (constant) processing method, by cooperating between the reciprocal motion and the feeding and expanding motion of the honing grindstone at high precision with a specified relation, and making uniform the load applied to the honing grindstone.

[0013]The honing method of the present invention is a method of honing the inner circumference of a work by moving a honing tool having a honing grindstone reciprocally in the axial direction of the inner circumference of the work, rotating about the axial line, and feeding and expanding the honing grindstone at a specific depth of cut by mechanical driving means, in which a spindle reciprocal driving servo motor and a depth setting driving servo motor are used respectively as a spindle reciprocal driving source for moving a rotational spindle having the honing tool reciprocally in the axial direction of the inner circumference of the work, and a depth cutting driving source for feeding and expanding the honing tool, and the motions of the two servo motors are mutually cooperated, so that the feeding and expanding motion of the honing grindstone is controlled to be synchronized and tuned with the reciprocal motion of the honing tool in order that the processing load applied to the honing grindstone may be made uniform.

[0029]According to the present invention, a spindle reciprocal driving servomotor and a depth setting driving servo motor are used respectively as a spindle reciprocal driving source for moving a rotational spindle having a honing tool reciprocally in the axial direction of the inner circumference of a work, and a depth cutting driving source for feeding and expanding a honing grindstone of the honing tool, and the motions of the two servo motors are mutually cooperated, so that the feeding and expanding motion of the honing grindstone is controlled to be synchronized and tuned with the reciprocal motion of the honing tool in order that the processing load applied to the honing grindstone may be made uniform, and therefore the following effects are obtained, and in the forced depth setting (constant) processing method, without modifying the basic existing mechanical elements (not required to add sensor or other additional mechanism), the reciprocal motion of the honing grindstone and the feeding and expanding motion can be cooperated at high precision in a specified relation, and the load applied to the honing grindstone can be made uniform, and the honing technology capable of stabilizing the precision and enhancing the precision of honing process can be presented.

[0031]According to the present invention, the motions of the spindle reciprocal driving servo motor and the depth setting driving servo motor are mutually cooperated, and the feeding and expanding motion of the honing grindstone is synchronized and tuned with the reciprocal motion of the honing tool so that the processing load applied on the honing grindstone may be averaged, and therefore excessive load is not applied to the honing grindstone when feeding and expanding the honing grindstone, and a tender feeding and expanding motion is realized for the honing grindstone.

[0032]Specifically, when the feeding and expanding amount of the honing grindstone is fixed at one stroke of the ascending and descending stroke of the honing tool, and it can be expanded by a fixed depth of cut, and since the feeding and expanding of the honing grindstone can be executed depending on the stroke speed of the honing tool, and dropping of abrasive grains of the honing grindstone can be suppressed, and the life of the honing grindstone may be substantially extended, and a honing grindstone of a long life is realized.

[0034]As mentioned above, excessive load is not applied to the honing grindstone when feeding and expanding the honing grindstone, and the load applied to the honing grindstone is uniform without variations, and the precision of honing process is stabilized, and the precision is enhanced.

Problems solved by technology

In such conventional grindstone depth cutting control, by the feeding and expanding motion of the honing grindstone (depth setting timing, depth setting speed, and depth of cut) in relation to the reciprocal motion of the honing grindstone, a sudden load may be applied to the honing grindstone when feeding and expanding the honing grindstone, or the load on the honing grindstone may not be stable but may fluctuate significantly, and abrasive grains of the honing grindstone may drop off excessively and the state is not always ideal for the honing grindstone, and much improvement has been required from the viewpoint of stability of honing precision or enhancement of precision.

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