JPH03178702A - Device and method for cutting article - Google Patents

Abstract

PURPOSE: To remove a material from an inner surface without considering the compensation for the deviation from a complete round by moving a cutting means on the inner surface with the relative motion of a cutting tool assembly and a guide means moved along the outer diameter of an article having a closed contour shape. CONSTITUTION: A cutter 22 is fitted to a fixed plate 24 facing a tappet guide 26, the gap between the cutter 22 and the tappet guide 26 is controlled by a micrometer 28, and the tappet guide 26 is fitted to ride on the outer face 16 of a ring part 10. A spring 30 applies biasing force to a mount 32, and the guide 26 is adjusted along an outer surface 16 in contact with it. If the ring 10 is distorted and its radius is slightly changed, the mount 32 is slid in the radial direction R on an arm 34, and a tool 22 cuts a cover 18 on the portion at a fixed distance from the outer diameter while using the outer diameter as a reference without using the center of the ring 10 as the reference.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cutting tool assembly, and more particularly to a cutting tool assembly having a slidable mounting base.

BACKGROUND OF THE INVENTION When reworking parts of a turbine engine with a closed profile, such as a stator or other ring-shaped article, it is often necessary to precisely remove the coating film. These coatings are used to maintain narrow gaps between stationary and rotating parts or to protect them from heat, oxidative corrosion and wear. Such a coated part consists of a metallic substrate with a closed profile (hereinafter referred to as a "ring-shaped part"), the ring-shaped part being coated with a metal bonding coating - usually with a thickness of approximately 0°008 (0,21) inches, with additional abradable seals, thermal barrier coatings, abradable coatings, or hardfacings thereon, typically having a coating thickness of approximately 0,008 inches (0,2n+m) to 0
．． 024 inches (0°6 aIll). The latter coatings may be metals, intermetallic ceramics, and mixtures thereof, and may be intentionally made porous by treatment under certain conditions. Abradable seals also include honeycomb-like structures made of metal and filled with an abradable material.

After a period of use, the ring-shaped part has to be repaired, and the coating has to be removed.

A variety of techniques have been employed to accomplish this, including mechanical processing, chemical stripping, sand blasting, and combinations thereof. (See US Pat. No. 4,339.282 and US Pat. No. 4,425.185.) However, each of these techniques has inherent deficiencies. Articles often become distorted when used in some engines.

When removing the coating using conventional tool holder mechanical processing methods, a portion of the metal substrate may also be removed, potentially damaging the article. Since chemical removal methods use strong acids or strong bases, there is a risk that these chemicals may attack the substrate. On the other hand, the method of spraying small sand poses a risk of causing considerable damage to the substrate unless there is a sufficiently skilled technique.

The mechanical processing method described above is carried out using a lathe, in particular a vertical turret lathe. Lathes are commonly used in conventional part fabrication techniques to remove burrs and chips, cut threads, and remove rubber or plastic from steel rollers.

These are described in other applications. (U.S. Patent Publications Nos. 1,354,776 and 2,351.892)
No. 3. ．． No. 763,727 and No. 3,771,
(See No. 392). The technology for the construction of lathes is evolving, for example springs are being used with movable cutting machines. (See U.S. Pat. No. 932,576 and U.S. Pat. No. 2,726.650).

However, there is currently no lathe that can always cut out a specified amount from the inner diameter of a (distorted) closed-profile article, such as a stator, without damaging the article. Not yet. The material on the inner surface is removed by a specified amount, without consideration of compensation for deviations from perfect circularity, or by retraction of the cutting blade in response to changes in the hardness of the cutting material. The star's material, which changes accordingly, will be removed. Based on the above-mentioned findings, research is being carried out on improved cutting machines that are more accurate and easier to use.

DISCLOSURE OF THE INVENTION The present invention consists of a slidably mounted cutting tool assembly, which includes an article having a closed profile shape and a plane perpendicular to the central axis, such as ring #'i L< is the mechanical processing of the stator, in particular the removal of layers of material from the annular surface (usually a substantially cylindrical surface). The arrangement of the slidable mount is determined by the guide means (tappets). The guide means is arranged on another annular surface (substantially cylindrical) of the workpiece.
(It is different from the one being processed.However, the central axis is
I am a connoisseur. ) is in contact with. The use of such a slidable mount allows the cutting means to follow the eccentricity of an article that is not perfectly circular when the tool assembly and the dyeing material are moved relative to t0.

This allows the desired amount of the coating or coating and bonding layer to be removed without damaging the substrate.

The above-mentioned features and advantages of the present invention as well as other features and advantages will become more apparent from the following description and the accompanying drawings.

[Embodiment] FIG. 1 shows one embodiment of the present invention. The main components are a tool holder/follower, a cutter, and a rotatable flat plate. Part 10 with a closed contour shape in Fig. 1
is mounted for rotation about centerline 12. The workpiece 10 has a cylindrical inner surface 14 and a cylindrical outer surface 16.
has. The inner surface 14 has a coating 18 thereon, the removal of which must be done without damaging the metallic substrate. The above is achieved by the tool assembly of the present invention, regardless of the distortions and distortions that occur during use of the parts.

The tool assembly 20 of the present invention is shown in greater detail in FIG. There the cutter 22 is mounted on the cutter fixing plate 24 opposite the tappet guide 26. In this case, the cutter 22 is made of carbide or a similar material. The gap between cutter 22 and guide 26 is controlled by micrometer 28. The closed profile part has an inner surface 14 and an outer surface 16, and in the special case shown in FIG. The beehive structure is soldered.

The tappet guide 26 is mounted to rest on the outer surface 16 of the closed profile part. The spring 30 biases the mount 32 so that the guide 26 contacts the outer surface 16 of the ring. The guide 26 is suitably adjusted to follow the outer surface 16 without excessive friction. This is remotely accomplished by using ball or roller bearings in the seals that actually contact the outer surface 16 of the guide 26. Although the cutter 22 is shown biased by a spring 30, a hydraulic or pneumatic cylinder or the like may also be used. In some cases this biasing means is not essential. Guide 26
The gap between the cutter 22 and the cutter 22 is adjusted by a micrometer 28, so that all or part of the bee-cone structure is removed according to precise instructions.

If the ring is distorted, the radius of the ring will change slightly, which is a natural result. The tool holder 32 is mounted so as to be slidable in the radial direction R (with respect to the ring) on an arm 34 which is fixed perpendicularly to the centerline axis. This sliding occurs in response to rotation of the article and changes in the effective diameter of the article. As described above, this tool does not cut at a constant diameter from the center of the closed contour of the ring, as in conventional technology, but from the outside diameter. , cutting is performed at a certain distance from the outer diameter. In the embodiment shown in FIGS. 1 and 2, the ring rotates about its central axis.

However, it is clear that arm 34
arranging the main axis of the arm substantially along the radius,
Similar results can be obtained by rotating the ring around the same central axis. It is also apparent that although the cutter 22 is shown removing the inner coating in the figures, the guide 22
6 on the inside, the cutter 22 can also be easily modified to remove the coating from the outer surface of the ring.

It will be appreciated by those skilled in the art that many variations on this subject are possible. The cutter can be moved radially (with respect to the ring) during the process (for example, if the micrometer is adjusted during cutting). The cutter can likewise be moved axially, so that a narrow cutter (bite) can remove the coating. It is also possible to use compound cutting means. As an alternative to cutters of the type shown in FIGS. 1 and 2, a powerful high speed grinding wheel could be used to remove the coating.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. This will be clear to those skilled in the art.

[Brief explanation of drawings]

FIG. 1 shows one embodiment of the invention. FIG. 2 is a step-up view of the embodiment of FIG. 1, showing a closed profile article being cut. 10...An article with a closed contour shape to be processed. 12... Center line or axis of rotation of an article with a closed profile shape. 14... Inner surface of article with closed contour shape, 16...
Outer surface of closed profile article, 18... Coating, 20
...Cutting tool assembly, 22...Cutter or cutting means. 24... Cutter fixing plate, 26... Guide or guide means. 28...Micrometer, 30...Spring, 32...
・Mount or tool holder/follower, 34...arm. 38...Honeycomb structure

Claims (7)

[Claims] (1) An apparatus for removing a predetermined amount of material from the inner surface of a closed profile part having an outer surface and an inner surface, comprising: a. guiding means attached to the outer surface of the part; b. cutting means for removing the substance from the inner surface; c. cutting means and the cutting means configured to follow the contour no matter what eccentricity the contour includes; a coupling means for coupling a guiding means; (2) a machine for removing at least one layer of material from the inner surface of a closed profile article having an externally cylindrical surface, comprising: a. means for supporting said article; and b. less material from said article. A cutting tool assembly for removing a layer of material comprising: [1] an arm disposed substantially in a radial direction of the closed profile article; and [2] a slide disposed on the arm. a movable mount; [3] the mount has a guide means positioned opposite the outer surface of the article; and [4] the guide means positions and follows the outer diameter of the article. [5] micrometer means for controlling said guide means; [6] said mount is fixed at a distance along the radius of the article with respect to said guide means; a cutting means for removing material from an inner surface of an article; [7] means for causing relative movement between the means for supporting the article and the cutting tool assembly; The relative movement between the object and the object causes the cutting means to remove at least one layer of material from the article, such that the material is removed from the outer diameter surface of the article, regardless of the eccentricity in the annular structure of the article. A machine for removing at least one layer of material from the inner surface of a closed profile article, the machine being configured to remove a predetermined thickness. (3) The machine described in claim 2,
The low friction tappet guide means is selected from the group consisting of roller bearings and ball bearings. (4) The machine described in claim 2,
The cutting means is a machine selected from the group consisting of a cutting machine and a high speed grinder. (5) The machine described in claim 2,
A machine comprising means for biasing said tappet guiding means towards said article selected from the group consisting of a spring, a hydraulic cylinder and a pneumatic cylinder. (6) An apparatus for removing coating material from the inner surface of a ring-shaped article having an outer surface and an inner surface, comprising: a. cutting means for removing the coating material from the inner surface; and b. identical with the cutting means. guide means arranged in the radial direction of the ring-shaped article and arranged to slide on the outer surface; c. the spacing between the cutting means and the guide means can be adjusted, thereby controlling the mounting means for coupling said cutting means to said guiding means in such a way as to separate said cutting means from said guiding means at a possible spacing; d. said mounting means radially of said ring-shaped article; e. said ring-shaped article is disposed between said cutting means and said guiding means, and said ring-shaped article is slidably mounted for movement along said cutting means; is induced about an axis generally passing through the center of the ring-shaped article, and the cutting means removes a controlled layer of material from the inner surface. (7) A method for removing material from the inner surface of a closed profile article having an outer diameter, comprising: a. [1] guiding means moving along the outer diameter of said article; a cutting means for removing the substance from the inner diameter of the surface; and [3] a cutting means such that the guide means and the cutting means move along the contour shape even if the contour shape includes any eccentricity. and coupling means coupling said guide means; b. supporting said article; and c. causing relative movement between said cutting tool and said article. and wherein relative movement between the cutting tool assembly and the article causes the cutting means to move over the inner surface to remove a controlled amount of material, and the guide means causes the cutting means to move the amount of material that the cutting means removes A method for removing material from the interior surface of a closed profile article by controlling the