JPS62218810A - Shim for adjusting input shaft direction of gyroscope and manufacture thereof - Google Patents

Abstract

PURPOSE:To minimize the temperature rise of a gyroscope, by shaping the shim so as to be inserted entirely between fitting surfaces of the gyroscope and a mount while it is formed into a finely accurate sheet with a fine angle between two planes. CONSTITUTION:A 2-axis detection type gyroscope 1 is mounted on a mount 2 with a metal clamp 5 through a highly accurate shim 30 with a fine angle between two planes. In this case, to adjust the input shaft direction of the gyroscope, first, the shim 30 with a fine angle between two planes is inserted between the gyroscope 1 and the mount 2 as being turned in a specified angle of inclination to set the spin shaft direction 7 of the gyroscope perpendicular to a plane defined by two input shafts 8 and 9 thereof 1 as shown by a symbol 6 and then, under such a condition, the input shaft directions 8 and 9 are corrected to those as shown by symbols 10 and 11. This can reduce heat resistance between the gyroscope and the mount thereby minimizing the temperature rise of the gyroscope by heat generation.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a shim for adjusting the input axis direction of a gyroscope and a method for manufacturing the same. The present invention relates to a shim that is used to adjust a gyroscope input axis direction to align with another gyroscope input axis or a reference axis direction of an application device, and a method of manufacturing such a shim.

[Conventional technology]

Conventionally, gyroscope input axis direction adjustment is.

This was mainly carried out by any of the following methods (4), CB), and (C).

FIG. 8 A diagram of a conventional method will be explained with reference to FIG. This is a method of inserting shims at points between the gyroscope and its mount. In the figure, (1) is a gyroscope with a two-axis detection amount, (2) is the mount, and (3) is a shim inserted at points. The three shims (5) are clamp fittings for mounting the gyroscope.

To adjust the gyroscope input axis direction, first, adjust the gyroscope spin axis direction (
By inserting and sandwiching shims (3) of different thicknesses at three points, gyroscope (1) is tilted in a predetermined direction by a small angle α, and the gyroscope spin axis direction is indicated by symbol (6). ) of the two input axis directions (8) and (9) respectively (4o).

(11) and align the plane formed by the two input axes of the gyroscope (1) with the plane of the reference system.

After that, by loosening the clamp fitting (5) and slightly rotating the gyroscope (1), the gyroscope (
The two input axis directions (10) and (11) in 1) are corrected in the directions indicated by symbols (12) and (15), respectively, and aligned with the axis of the reference system.

Conventional method (B) is a method in which adjustments are made by cutting or grinding the mounting surface on the gyroscope side, and this is shown in Fig. 10.
This will be explained with reference to FIG.

(1) is a two-axis detection gyroscope whose mounting surface is cut or ground at a minute angle, (2) is a mount, (5
) is the clamp metal fitting, and (4) is the part removed by cutting or grinding.

To adjust the direction of the gyroscope input axis, first, tilt the mounting surface of the gyroscope (1) in a predetermined direction by a small angle α and cut or grind one part (4) of the gyroscope (1). two input shafts (8)
, (9) and the gyroscope spin axis direction (7) perpendicular to the plane formed by (9) is in the state of code (6), the two input axis directions of the gyroscope (1) (8), (9)
are corrected in the directions indicated by symbols (1o) and (11), respectively, and the plane formed by the two input axes of the gyroscope (1) is aligned with the plane of the reference system.

After this, the gyroscope (
-) by slightly rotating the gyroscope (1
) are corrected in the directions indicated by symbols (12) and (13), respectively, and aligned with the axis of the reference system.

Next, the conventional method (C) is a method in which adjustments are made by cutting or grinding the mounting surface on the mount side. This is explained using Figure 12. (1) is the gyroscope, and (2) is the mounting surface. Mounts cut or ground at minute angles,
(4) is a portion removed by cutting or grinding.

To adjust the direction of the gyroscope input axis, first, the mounting surface on the mount side is tilted by a small angle α in a predetermined direction, and the portion (4) is cut or ground. The subsequent steps are exactly the same as in the conventional method CB).

However, in conventional methods (B) and (C), the mounting surface contacts the entire surface of the metal surface and no shims are used.
Although the heat conduction between the gyroscope (1) and the mount (2) is good, since the cutting or grinding process is performed during the adjustment work, the adjustment work takes time and the workability is poor.

Additionally, the thermal expansion coefficients of the mounting surface material on the gyroscope (1) side and the mounting surface material on the mount (2) side often differ greatly (as a result, the mounting surface may become distorted due to temperature changes). Moreover, since slight sliding wear occurs between the mounting surfaces, the stability in the direction of the gyroscope input axis, which has been adjusted with high precision, is impaired.

Micro-sliding wear here refers to oxidative wear corrosion damage caused by reciprocating sliding with small amplitudes due to relative movement of mutually contacting members due to temperature changes or mechanical vibrations.

Furthermore, in the conventional method (B), when cutting or grinding the mounting surface on the gyroscope side, the gyroscope (1)
The drawback is that there is a high risk of damage due to vibrations and shocks applied to the device, and the impact on performance.

In addition, in conventional method (C), the mount (2) must be removed from the gyroscope input axis direction adjustment jig for processing, which complicates the adjustment procedure and significantly lengthens the time required for adjustment. Particularly poor workability. Furthermore, since the surface treatment film applied to the light metal alloy mount (2) is scraped off, touch-up corrections are required after cutting or grinding to prevent electrolytic corrosion.
Another disadvantage is that resurfacing is required.

As a result of the above, the conventional method of adjusting by inserting shims (b)
is advantageous.

[Problem that the invention seeks to solve]

Conventional shims for adjusting the input axis direction of gyroscopes in the conventional method described above have a small contact area with the metal surface, so it is recommended not to use shims in order to quickly conduct heat from the gyroscope's heat to the mount. Inferior to the case,
This is disadvantageous in terms of gyroscope temperature stability. Furthermore, because of the point contact structure, there are also problems in terms of stability in the direction of the gyroscope input axis due to vibrations, temperature cycles, and long-term changes over time. Furthermore, when adjusting the gyroscope input axis, there is a drawback that the shims will shift when the gyroscope is slightly rotated after inserting the shims, and in the case of a special Vc Z-axis detection gyroscope, it is difficult to make precise adjustments. There were problems such as poor workability.

This invention was made in order to solve the above-mentioned problems, and it is possible to perform highly accurate gyroscope input axis direction adjustment, maintain good heat conduction between the gyroscope and the mount, and achieve good stability. This can be done in a short time without the risk of damaging the gyroscope or affecting its performance in the installed state.Furthermore, the gyroscope has good stability against temperature changes in the direction of the gyroscope input shaft after adjustment. The purpose is to obtain a shim for adjusting the input axis direction.

Another object of the present invention is to provide a method for manufacturing a shim for adjusting the input axis direction of a gyroscope, which can reliably manufacture a shim with high precision that meets the above objectives.

[Means for solving problems]

The shim for adjusting the input axis direction of a gyroscope according to the present invention has a shape that is sandwiched between the mounting surfaces of the gyroscope and the mount, and is a thin plate having a highly accurate minute angle between 2,000 surfaces. be.

A method for manufacturing a shim for adjusting the input axis direction of a gyroscope according to another invention of the present invention is to electrodeposit a metal that does not dissolve in alkali on an aluminum alloy base material as a shim material, and use the reference surface of the base material to create a shim 2. After performing micro-angulation between surfaces and surface finishing using machining such as surface polishing.

The shim is manufactured by cutting out the outer shape of the shim by wire-cut electrical discharge machining or the like, and finally, the aluminum alloy base material that is in close contact with one side of the shim is dissolved and removed using an alkaline solution to obtain the desired shim.

[For production]

In this invention, the shim has a shape that is sandwiched between the mounting surfaces of the gyroscope and the mount, and
By having a highly precise small angle between the surfaces, the thermal resistance through the shim between the gyroscope mounts can be minimized, and the gyroscope temperature rise due to gyroscope heat generation is reduced.

When adjusting the direction of the gyroscope's input axis, compared to the conventional method (4) in which shims are inserted at points when making adjustments by slightly rotating the gyroscope, if there is a slight deviation in the rotational direction of the shim, the shim Since the whole part rotates minutely, by electrodepositing it on a base material that has a gyroscope, it is possible to fix the shim material with high precision during machining by forming a precise minute angle by surface polishing.

This is possible due to the high adhesion force that can withstand grinding resistance, and the use of a reference surface allows for highly accurate micro-angular machining.

Furthermore, by using an aluminum alloy as the material for the base material, only the base material can be dissolved and removed using an alkaline solution at the end, allowing easy shim separation without causing damage.

〔Example〕

FIGS. 4 and 5 show an embodiment of the present invention, in which a two-axis detection gyroscope (1) is mounted on a mount (2) via a shim (30) having a highly accurate small angle between its two surfaces. ) It is attached using a clamp fitting (5). The clamp fitting (5) is the same as the conventional one.

The shim (30) has a ring shape as shown in FIGS. 6 and 7, and as shown in FIGS. 4 and 5.

It is sandwiched between the gyroscope (1) and the mount (2). The material of the shim (30) has a coefficient of thermal expansion approximately between that of iron-nickel alloy, which is the material of the mounting surface on the gyroscope (1) side, and aluminum alloy, which is the material of the mounting surface on the mount (2) side. Pure copper is used.

Several types are manufactured and prepared in advance based on the processing accuracy of (2), and the one closest to the required fine adjustment angle is selected and used.

How to adjust the gyroscope input axis direction.

In Figures 4 and 5, first, there is a small angle α between the 2,000 planes.
The two input shafts (8) of the gyroscope (1), ( The gyroscope spin axis direction (7) which is orthogonal to the plane formed by ).

Correct it in the direction shown in (11), and turn the gyroscope (1)
The plane formed by the two input axes of is aligned with the plane of the reference system.

After this, the gyroscope (1
) by slightly rotating the gyroscope (1)
The two input axis directions (+o) and (+t) are corrected in the directions indicated by symbols (12) and (13), respectively, and aligned with the axis of the reference system.

Next, as for the manufacturing blade of such a shim, as shown in FIG. 13, as shown in FIG. )), then finish one side by wrapping [
(b)] Fixed by vacuum suction or magnetic force, etc.
Slight angles are processed by surface polishing etc. (see the same figure)
C)] As shown in Fig. 14, the surface is finished by lapping the thin plate material [Fig. 11 (a)].
The small angle is processed in the same way as the method shown in c) [14th
[Figure (B)] After that, a shim shape may be produced by photo-etching [Figure (C)] to obtain a shim.

However, since all of these manufacturing methods are manufactured from thin plate materials, it is difficult to securely fix them tightly with good flatness and machine them, and it is difficult to make thin shims with high precision minute angles and surface accuracy. difficult to obtain.

Another invention of the present invention solves such problems, and one embodiment thereof will be described below with reference to the manufacturing process shown in FIG.

A base block (1) having a reference surface (15) with a flatness of 3μ or less and a surface roughness Rzi of 5μ or less was manufactured using an aluminum alloy material [FIG. (al)].

(a2)), copper (
16) is electrodeposited [(bl) (bz) in the same figure]. At this time.

Part of the reference surface (15) on the paceb, lock (14) (
Tea) is masked and copper (16) is not electrodeposited in order to use the subsequent minute angle as a reference surface during processing. This means that one side (lower side) of the shim has been machined with high precision. After that, by surface polishing, the other one side of the shim was processed at the same time as the small angle was processed [see the same figure (C10 2)].

Furthermore, only the portion that will become the shim shape is cut out by wire-cut electric discharge machining (see the same figure (dI Xd2)).

Finally, only the base material part (17) of the aluminum alloy was
Dissolve and remove while heating in ~20% aqueous sodium hydroxide solution to obtain only the copper shim (60) [same figure (81)
)(e2)).

Incidentally, the smut-like residue adhering to the surface of copper (16) can be easily removed by immersing it in 5 to 10% sulfuric acid.

The shim (30) manufactured as described above has a shape that is precisely sandwiched between the mounting surface on the gyroscope (1) side and the mounting surface on the mount (2) side with high precision,
In addition, by using copper, which has excellent thermal conductivity, as the shim material, the thermal resistance through the shim (SO) between the gyroscope (1) and the mount (2) is kept to a minimum. This prevents the gyroscope temperature from increasing too much due to gyroscope heat generation.

In addition, the shim (30) has a highly accurate minute angle α between 2,000 surfaces.
, and because it is sandwiched between the mounting surfaces on the entire surface,
The two input shafts (8) of the gyroscope (1), (
9) Align the plane formed by the plane of the reference system, and
During the subsequent adjustment by minute rotation of the gyroscope (1), even if there is a slight deviation in the rotational direction of the shim (50), the entire shim (30) rotates, so the spin axis of the gyroscope (7LK and rJF , -14 and “extreme axis%”
"?r" makes this adjustment work easier.In addition, when the gyroscope mounting surface shape is ring-shaped as in this example, it is possible to adjust the gyroscope spin axis in any direction. , by rotating the shim (30) on the mounting surface.

Furthermore, the thermal expansion coefficient of copper, which is the shim material, is the thermal expansion coefficient of the iron-nickel alloy, which is the mounting surface material on the gyroscope (1) side, and the thermal expansion coefficient of the aluminum alloy, which is the mounting surface material on the mount (2) side. The shim of this invention can be used to alleviate the stress that occurs between the mounting surfaces of iron-nickel alloy and aluminum alloy due to the large difference in thermal expansion coefficient between the iron-nickel alloy and aluminum alloy due to temperature changes. This prevents slight sliding wear on the aluminum alloy side that would otherwise occur during temperature cycle tests, reduces deformation and strain near the mounting surface, and increases stability in the direction of the gyroscope input axis against temperature changes.

In addition, the above shim manufacturing method uses copper (1
6) made of aluminum alloy (1)
By forming the shim material by electrodeposition on the reference surface (15) in 4), the shim material can be fixed with high precision during machining by flat surface polishing.

In addition, it is possible to achieve high adhesion that can sufficiently withstand grinding resistance, and by using the reference surface (15a) on which copper is not electrodeposited, highly accurate micro-angular machining can be reliably performed.

After this, in order to prevent the copper from forming, a shim-shaped ring is cut out using wire-cut electric discharge machining, and finally, a strong etching effect obtained by heating a concentrated sodium hydroxide aqueous solution on the aluminum alloy is used. hand,
The base material part (17) is dissolved away to obtain a thin copper shim without any mechanical damage.

In the above example, the shim material is machined with a minute angle and then the shim shape is cut out. However, from the beginning, only the portion of the aluminum alloy pace block (14) that will become the heshim outline is printed with a photo. It is also possible to obtain the shim (3) by electrodepositing copper using a resist, followed by processing to form a minute angle and dissolving and removing the aluminum alloy. However, compared to the method of the above embodiment, there are restrictions on the thickness of the photoresist, and it is difficult to ensure a sufficient thickness of the electrodeposited metal, and the base plate of the photoresist film (
14) In the lamination process, the thickness of the pace block is often limited due to the lamination equipment, and small angles may deteriorate the processing accuracy during processing, and the electrodeposition process Due to problems with the quality of electrodeposited copper, such as the adhesion of the photoresist film and the difficulty in removing hydrogen gas generated from electrodeposition into the recesses of the photoresist film, the manufacturing method of the above example was not adopted. Inferior in comparison.

Figures 2 and 3 illustrate the linearity of the shim thickness change according to the minute angle of the shim (!10) obtained by the manufacturing method of the present invention. 30) can be manufactured with high precision.

In the above example, the shim (3o) is '50 sea
It goes without saying that by preparing gbic in detail every 13c, it is possible to adjust the gyroscope input axis direction with higher precision.

In addition, in the above embodiment, the manufacturing method of the shim (3o) is such that copper (16) is attached to the reference surface (15) of the base block (1).
After electrodeposition, a slight angle is formed by surface polishing, but this may also be done by milling. However, since the surface roughness or surface precision of the machined surface is inferior to that of flat polishing, lapping may have to be added. The shim shape is made by wire-cut electrical discharge machining.

In the cutting step, the shim shape may be cut out by other electrical discharge machining using a fixed electrode, or only the copper (16) portion may be processed into a shim shape by photoeratin processing.

Furthermore, although the above embodiment describes the input axis direction adjustment of the two-axis detection gyroscope, it goes without saying that
Needless to say, the same effect can be obtained when adjusting the direction of the input axis of a single-axis detection gyroscope.

Furthermore, although this invention is described for use in adjusting the direction of the input axis of a gyroscope, it can be similarly applied to adjusting the direction of the input axis of a high-precision accelerometer. can be similarly applied to optical adjustment work such as adjustment of mirror surface direction.

〔Effect of the invention〕

As described above, according to the present invention, the shim used for gyroscope input shaft adjustment is shaped to be sandwiched between the entire surface between the gyroscope mounting surfaces. The adjustment work to make it stand is done in a short time.
Moreover, there is an effect that it can be performed safely with respect to the gyroscope.

According to another aspect of the present invention, a shim material that hardly dissolves in alkali is formed on the reference surface of the aluminum base material by electrodeposition.

It is possible to fix the shim material with high precision and high adhesion, and it is also possible to melt and remove only the aluminum base material later, which has the effect of obtaining a shim with a highly accurate minute angle.

[Brief explanation of drawings]

FIG. 1 is a sectional view of another embodiment of this invention, (a
Flowchart diagrams shown in j) to (el) and plan views (a2) to (e2), Figure 2 is the manufacturing method shown in Figure 1 (a) * (b), (c) Five types of shims Figure 3 is a plan view (a) and side cross-sectional view (b) of a shim based on the experimental data shown in Figure 2. Figure 4 is an example of the present invention. A front sectional view showing how to use the
FIG. 5 is a plan view of the main part, FIG. 6 is a plan view of the embodiment, and FIG. 7 is a side sectional view. FIGS. 8 to 12 are for explaining a conventional method of adjusting the input axis direction of a gyroscope. 8 is an exploded perspective view for explaining the conventional method (B), FIG. 9 is the same (a plan view of the main part), and FIG. 10 is an exploded front sectional view for explaining the conventional method (B). The figure is also a plan view of the main part, and Figure 12 is the conventional method (C)
It is an exploded front sectional view for explaining. Figure 15, 1st
FIG. 4 is a 70-chart diagram of a method of manufacturing a sheet, which can be considered as a conventional method. (1)...Gyroscope, (Imount, (1)
4) Base block (base material), (15) Reference surface. (16)...Copper (electrodeposited metal), (17)...Base material part,
(30)...Sim. In each figure, the same reference numerals indicate the same or corresponding parts. Patent applicant: Mitsubishi Precision Co., Ltd.
＾Fig. 2 □□-ko (b) (C) Measuring position Fig. 7 Fig. 1 One side of Yu〉 (b) [Work 2 ■ Fig. 14・Slope lappi）Ge (())Zabu-fuki shinun・Photo・Work・Sochi)Ge processing

Claims (6)

[Claims] (1) A shape that is sandwiched between the entire surface of the mounting surfaces of a gyroscope and a mount to which the gyroscope is mounted, and that is in contact with the mounting surface.
A shim for adjusting the input axis direction of a gyroscope that has a small angle between planes. (2) In the input axis direction of the gyroscope according to claim 1, the gyroscope is made of a material having a thermal expansion coefficient intermediate between that of the gyroscope side attachment part material and the mount side attachment part material. Adjustment shim. (3) The shim for adjusting the input axis direction of a gyroscope according to claim 1, which has a ring shape. (4) Electrodeposit a metal that is hardly soluble in an alkaline solution to serve as the shim material on the reference surface of the aluminum alloy base material, and then use the reference surface as a reference for machining to create a minute angle between the two shim surfaces and finish the surface. A method of manufacturing a shim for adjusting the direction of an input axis of a gyroscope, by cutting out a shim shape that matches the shape of a mounting surface, and then dissolving and removing a portion of the base material using an alkaline solution. (5) The method for manufacturing a shim for adjusting the input axis direction of a gyroscope according to claim 4, wherein the shim material electrodeposited on the base material is copper. (6) The process of cutting out a shim shape that matches the mounting surface shape,
A method of manufacturing a shim for adjusting the input axis direction of a gyroscope according to claim 4 by wire cut electrical discharge machining.