阅读说明：本技术 一种用于石英半球谐振陀螺仪谐振子与基座焊接方法 (Method for welding harmonic oscillator and base of quartz hemispherical resonator gyroscope ) 是由 侯文超 韦路锋 刘仁龙 赵小明 赵丙权 王跃强 于 2021-09-01 设计创作，主要内容包括：本发明涉及一种用于石英半球谐振陀螺仪谐振子与基座焊接方法,步骤为：1、在谐振子与基座粗装配到位后,选取预先涂覆助焊剂的锡银铜焊片,卷成圆筒状后插入到谐振子与基座的配合间隙之间,然后将谐振子与基座精装配到位；2、将步骤1的组装结构放置在电磁感应加热器的加热线圈下方,加热线圈与锡银铜焊片对正,3、在真空焊接作业环境下,开启电磁感应加热器电源并调整其输出功率至设定值,待焊片完全熔融后继续保持一段时间；4、关闭电磁感应加热器电源,去真空,待融化后的焊片冷却至室温后,移走谐振子及基座,完成谐振子及基座焊接。本发明克服了传统焊接加热时间过长、焊接不均匀的问题。(The invention relates to a method for welding a harmonic oscillator and a base of a quartz hemispherical resonator gyroscope, which comprises the following steps: 1. after the harmonic oscillator and the base are roughly assembled in place, selecting a tin-silver-copper soldering lug coated with soldering flux in advance, rolling the soldering lug into a cylinder shape, inserting the soldering lug between a matching gap of the harmonic oscillator and the base, and then finely assembling the harmonic oscillator and the base in place; 2. placing the assembly structure in the step 1 below a heating coil of an electromagnetic induction heater, aligning the heating coil with a tin-silver-copper soldering lug, 3, starting a power supply of the electromagnetic induction heater and adjusting the output power of the electromagnetic induction heater to a set value under a vacuum welding operation environment, and continuously keeping for a period of time after the soldering lug is completely melted; 4. and closing the power supply of the electromagnetic induction heater, removing vacuum, cooling the melted soldering lug to room temperature, and then removing the harmonic oscillator and the base to complete the welding of the harmonic oscillator and the base. The invention overcomes the problems of overlong heating time and uneven welding in the traditional welding.)

1. A method for welding a harmonic oscillator and a base of a quartz hemispherical resonator gyroscope is characterized by comprising the following steps:

step 1, after the harmonic oscillator and the base are roughly assembled in place, selecting a tin-silver-copper soldering lug coated with soldering flux in advance, rolling the soldering lug into a cylinder shape, inserting the cylinder shape between a matching gap between the harmonic oscillator and the base, and then finely assembling the harmonic oscillator and the base in place;

step 2, placing the assembly structure in the step 1 below a heating coil of the electromagnetic induction heater, and aligning the heating coil with a tin-silver-copper soldering lug;

step 3, under the vacuum welding operation environment, starting a power supply of the electromagnetic induction heater and adjusting the output power of the electromagnetic induction heater to a set value, and continuously keeping for a period of time after the to-be-welded sheets are completely melted;

and 4, closing the power supply of the electromagnetic induction heater, removing vacuum, cooling the melted soldering lug to room temperature, and then removing the harmonic oscillator and the base to complete the welding of the harmonic oscillator and the base.

2. The method for welding the resonator of the quartz hemispherical resonator gyroscope and the base as claimed in claim 1, wherein: in the step 1, the thickness of the tin-silver-copper soldering lug is 0.1mm, and the pre-coated soldering flux is rosin.

3. The method for welding the resonator of the quartz hemispherical resonator gyroscope and the base as claimed in claim 1, wherein: the vacuum degree of the welding operation environment in the step 3 is as follows: 10 pa.

4. The method for welding the resonator of the quartz hemispherical resonator gyroscope and the base as claimed in claim 1, wherein: the set value of the output power in step 3 is 6.5 Kw.

5. The method for welding the resonator of the quartz hemispherical resonator gyroscope and the base as claimed in claim 4, wherein: and in the step 3, the continuous holding time is 10s after the soldering lug is melted.

Technical Field

The invention belongs to the technical field of manufacturing of quartz hemispherical resonator gyroscopes, relates to a technology for connecting a harmonic oscillator and a base, and particularly relates to a method for welding the harmonic oscillator and the base of a quartz hemispherical resonator gyroscope.

Background

The quartz hemispherical resonator gyroscope is a novel solid fluctuation gyroscope and has the advantages of simple structure, small volume, low power consumption, strong shock resistance, short starting time, long service life and the like. Therefore, the method has wide application prospect and is very suitable for the fields of weapons, aviation, aerospace and the like.

At present, a harmonic oscillator in a quartz hemispherical resonator gyroscope is connected with a base through ferroelectrics to melt a flux, and the flux fills a fit gap between the harmonic oscillator and the base to realize the welding connection of the harmonic oscillator and the base. The existing connection mode has the problems of uneven residual stress distribution, unreliable connection and the like, and finally the Q value of the harmonic oscillator is greatly reduced after the connection is finished, so that the precision and the engineering of the quartz hemispherical resonator gyroscope are seriously restricted.

Based on the above related problems, a new connection method needs to be explored to meet the related index requirements of the Q value.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides the method for welding the harmonic oscillator of the quartz hemispherical resonator gyroscope and the base, which has the advantages of short welding time, good welding uniformity and small influence on the Q value of the harmonic oscillator after welding.

The purpose of the invention is realized by the following technical scheme:

a method for welding a harmonic oscillator and a base of a quartz hemispherical resonator gyroscope is characterized by comprising the following steps:

step 1, after the harmonic oscillator and the base are roughly assembled in place, selecting a tin-silver-copper soldering lug coated with soldering flux in advance, rolling the soldering lug into a cylinder shape, inserting the cylinder shape between a matching gap between the harmonic oscillator and the base, and then finely assembling the harmonic oscillator and the base in place;

step 2, placing the assembly structure in the step 1 below a heating coil of the electromagnetic induction heater, and aligning the heating coil with a tin-silver-copper soldering lug;

step 3, under the vacuum welding operation environment, starting a power supply of the electromagnetic induction heater and adjusting the output power of the electromagnetic induction heater to a set value, and continuously keeping for a period of time after the to-be-welded sheets are completely melted;

and 4, closing the power supply of the electromagnetic induction heater, removing vacuum, cooling the melted soldering lug to room temperature, and then removing the harmonic oscillator and the base to complete the welding of the harmonic oscillator and the base.

Further: in the step 1, the thickness of the tin-silver-copper soldering lug is 0.1mm, and the pre-coated soldering flux is rosin.

Further: the vacuum degree of the welding operation environment in the step 3 is as follows: 10 pa.

Further: the set value of the output power in step 3 is 6.5 Kw.

Further, the method comprises the following steps: and in the step 3, the continuous holding time is 10s after the soldering lug is melted.

The invention has the advantages and positive effects that:

1. the welding method provided by the invention adopts an electromagnetic induction heating welding mode, electromagnetic induction heating belongs to non-contact heating welding, the time is short, the energy is concentrated on a local part, and therefore, the problems of overlong heating time, uneven welding and the like of the traditional welding are solved, meanwhile, the problem that the vacuum degree is difficult to maintain for a long time by glue connection is solved, and the adverse effect on the Q value of the harmonic oscillator can be reduced.

2. Before the harmonic oscillator and the base are accurately positioned, the harmonic oscillator and the base need to be accurately positioned, the rigidity of a positioning tool cannot be too large, corresponding welding stress can be generated during welding, and if the rigidity is too large, the Q value of the harmonic oscillator can be greatly influenced in the later period, so that extra interference is not expected after the harmonic oscillator and the base are accurately positioned;

3. the invention adopts the tin-silver-copper soldering lug as the solder, has high melting point, can improve the exhaust temperature when the resonance gyroscope exhausts in vacuum, is beneficial to maintaining the vacuum degree of the resonance gyroscope after packaging, and also has the advantages of thermal cycle fatigue resistance and the like.

4. The invention completes heating welding in vacuum environment, and the welding in vacuum has the following advantages: firstly, the oxidation of the soldering tin during melting can be avoided; secondly, the welding uniformity can be improved, and the porosity of the welding seam is reduced, so that the adverse effect on the Q value of the harmonic oscillator is reduced.

Drawings

FIG. 1 is a schematic view of the assembly of a harmonic oscillator and a base according to the present invention;

FIG. 2 is a schematic view of the electromagnetic induction heater heat welding of the present invention.

Detailed Description

The structure of the present invention will be further described by way of examples with reference to the accompanying drawings. It is to be understood that this embodiment is illustrative and not restrictive.

A method for welding a resonator and a base of a quartz hemispherical resonator gyroscope, please refer to fig. 1-2, the invention points are: the method comprises the following steps:

step 1, after the harmonic oscillator 3 and the base 1 are roughly assembled in place, selecting a tin-silver-copper soldering lug 2 coated with soldering flux in advance, rolling the soldering lug into a cylinder shape, inserting the cylinder shape between a matching gap between the harmonic oscillator and the base, and then precisely assembling the harmonic oscillator and the base in place. The flux pre-coated on the soldering tin is rosin which has the function of improving the fluidity of the soldering tin; the thickness of the tin-silver-copper soldering sheet is preferably 0.1mm, and the unilateral fit clearance between the harmonic oscillator and the base is generally 0.2-0.3 mm.

And 2, placing the assembly structure in the step 1 below a heating coil 5 of the electromagnetic induction heater 4, aligning the heating coil with the tin-silver-copper soldering lug, wherein the heating coil is not in contact with the tin-silver-copper soldering lug, the tin-silver-copper soldering lug is positioned at the central line of the heating coil, and the distance from the top of the tin-silver-copper soldering lug to the bottom of the coil is about 3 mm.

And 3, under the vacuum welding operation environment, starting a power supply of the electromagnetic induction heater and adjusting the output power of the electromagnetic induction heater to a set value, and continuously maintaining for a period of time after the to-be-welded sheet is completely molten. The degree of vacuum is preferably: 10 pa; the output power set point is preferably 6.5Kw with a holding time of 10 s.

And 4, closing the power supply of the electromagnetic induction heater, removing vacuum, cooling the melted soldering lug to room temperature, and then removing the harmonic oscillator and the base to complete the welding of the harmonic oscillator and the base.

The harmonic oscillator and the base are assembled by using a positioning tool, the positioning tool is only required to be of an existing tool structure, and the positioning tool is not the invention point of the harmonic oscillator and is not described herein any more.

In summary, the main technical points of the present invention include the following aspects:

the technical points are as follows: selection of welding mode

The invention adopts an electromagnetic induction heater for heating welding, and the welding mode is characterized in that: the welding mode is applied to welding of the harmonic oscillator and the base, and can ensure that the Q value of the harmonic oscillator is almost not damaged and the stability of the Q value is high.

And a second technical point: the choice of soldering lug material is shown in table one: )

TABLE-Effect of different solders on Q-value

Name of solder	Change in Q value of harmonic oscillator
		Tin silver copper	2％-5％
Indium-based solder	10％
		Lead-tin solder	15％

As can be seen from Table I, the loss of Q value of the harmonic oscillator after welding is minimal by using the Sn-Ag-Cu soldering chip, so the Sn-Ag-Cu soldering chip is preferably used in the invention.

The technical points are as follows: selection of power output of electromagnetic induction heater, see table two

TABLE II solder melting behavior at different output powers

Magnitude of power	Melting condition of solder
		4kw	Do not melt
6.5kw	The solder is in a molten state, and the fluidity is better at this time
		8kw	The soldering lug is quickly axially broken from the overlapping position, and the subsequent soldering lug can not be melted

As can be seen from table two, when the output power is 6.5Kw, the sn-ag-cu soldering flake is in a molten state, the fluidity thereof is optimized, and at this time, the soldering tin can fully fill the gap between the resonator and the base, so the power supply output setting value of the electromagnetic induction heater in the present invention is preferably 6.5 Kw.

Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit of the invention and the scope of the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.