阅读说明：本技术 宽带毫米波行波管阴极组件中钼杯形件的制备方法 (Preparation method of molybdenum cup-shaped piece in cathode assembly of broadband millimeter wave traveling wave tube ) 是由 刘雷 王鑫 张卫佳 陈维喜 张界威 于 2019-09-02 设计创作，主要内容包括：本发明公开了一种宽带毫米波行波管阴极组件中钼杯形件的制备方法,包括：将钼片剪成所需条带；使用冲床和冲切模具将条带钼片下料成圆形钼片；超声波清洗；酸洗,氢气退火；一次旋压；酸洗及氢气退火；二次旋压；车床加工处理；酸洗及氢气退火；三次旋压；车床加工处理；快走丝切割端面；酸洗及氢气退火；车床加工；二次车床加工；慢走丝加工。该制备方法更好地保证了零件的平整度及壁厚的一致性要求,不仅提升了该零件的加工效率及加工成功率,而且降低了人工及材料成本；同时,该制备方法使用性广范,可加工钼、可伐、钽、铌等有特殊材料要求的薄壁零件。(The invention discloses a preparation method of a molybdenum cup-shaped piece in a cathode assembly of a broadband millimeter wave traveling wave tube, which comprises the following steps: cutting the molybdenum sheet into required strips; blanking the strip molybdenum sheet into a circular molybdenum sheet by using a punch and a punching die; ultrasonic cleaning; acid washing and hydrogen annealing; spinning for the first time; acid washing and hydrogen annealing; secondary spinning; processing by a lathe; acid washing and hydrogen annealing; spinning for three times; processing by a lathe; cutting the end face by the fast wire; acid washing and hydrogen annealing; machining by a lathe; secondary lathe processing; and (5) processing the slow-speed wire. The preparation method better ensures the consistency requirements of the flatness and the wall thickness of the part, not only improves the processing efficiency and the processing success rate of the part, but also reduces the labor and material cost; meanwhile, the preparation method has wide usability, and can be used for processing thin-wall parts such as molybdenum, kovar, tantalum, niobium and the like with special material requirements.)

1. A preparation method of a molybdenum cup-shaped piece in a cathode assembly of a broadband millimeter wave traveling wave tube is characterized by comprising the following steps:

step 1, cutting a molybdenum sheet into required strips;

step 2, blanking the strip molybdenum sheet into a phi 14 circular molybdenum sheet by using a punch and a punching die;

step 3, carrying out ultrasonic cleaning on the molybdenum sheet blank obtained in the step 2 in an ultrasonic instrument;

step 4, placing the molybdenum sheet blank obtained in the step 3 into a chemically polished molten liquid for acid cleaning, drying, and then placing into a vacuum high-frequency hydrogen annealing furnace for annealing treatment;

step 5, pressing the molybdenum sheet blank processed in the step 4 on a primary spinning tool (1), smearing oil and heating by using an alcohol burner, starting a lathe, pressing the molybdenum sheet blank by using a brass spinning rod (7), and rotating along with a main shaft of the lathe to form a primary spinning blank;

step 6, carrying out acid washing and hydrogen annealing on the primary spinning blank obtained in the step 5;

step 7, placing the primary spinning blank processed in the step 6 on a secondary spinning tool (2), smearing oil and heating by using an alcohol lamp, starting a lathe, pressing the molybdenum sheet blank by using a brass spinning rod (7), and rotating along with a main shaft of the lathe to form a secondary spinning blank;

step 8, performing lathe processing on the secondary spinning blank;

step 9, carrying out acid washing and hydrogen annealing on the secondary spinning blank processed in the step 8;

step 10, placing the secondary spinning blank processed in the step 9 on a tertiary spinning tool (3), smearing oil and heating by using an alcohol lamp, starting a lathe, pressing the molybdenum sheet blank by using a brass spinning rod (7), and rotating along with a main shaft of the lathe to form a tertiary spinning blank;

step 11, clamping the three-time spinning blank obtained in the step 10 on a movable ejector (6), an ejector (5) and a pressing block (4) on a lathe by using a core rod for pressing, and turning an outer circle;

step 12, clamping the blank processed in the step 11 by using a spring chuck, and cutting an end face by using a fast moving wire;

step 13, carrying out acid washing and hydrogen annealing on the blank processed in the step 12;

step 14, machining by a lathe;

step 15, secondary lathe machining;

and step 16, obtaining the final part after slow wire feeding processing.

2. The method of claim 1, further comprising deburring the perimeter of the circular molybdenum sheet after step 2 and before step 3.

3. The method according to claim 1, wherein the ultrasonic cleaning in step 3 is followed by water removal and drying.

4. The production method according to claim 1, wherein the secondary spun blank is lathed in step 8 by turning an outer circle Φ 2.4 and a round R0.2.

5. The method of claim 1, wherein the outer circle Φ 7.3 is turned in step 11.

6. The method of claim 1, wherein the cutting of the end face with the fast moving wire in step 12 ensures 3 mm.

7. The method of claim 1, wherein the lathing in step 14 comprises: boring a spring chuck according to the excircle of the part blank, putting the blank processed in the step 13 into the spring chuck, protecting a phi 7 inner hole by using a first plug block, protecting a phi 2 inner hole by using a second plug block, and turning the end face to be smooth; and then taking down the part blank, protecting a phi 7 inner hole by using a first plug block, reversely clamping, turning an end face, ensuring that the thickness of the bottom face is 0.1mm, and boring a phi 2 hole.

8. The method of claim 1, wherein the secondary lathing in step 15 comprises: and (3) positioning the blank part obtained in the step (14) by using a hole phi 2, tightly pushing two sides of the blank part by using a jacking block with the thickness of 0.1, and removing burrs after finely turning an excircle phi 7.2.

9. The method of claim 1, wherein step 16 comprises clamping the part blank obtained in step 15 with a collet chuck and cutting the end face with a slow-running wire to ensure a total length of 2.6 mm.

Technical Field

The invention relates to the technical field of travelling wave tube manufacturing, in particular to a method for manufacturing a molybdenum cup-shaped piece in a cathode assembly of a broadband millimeter wave travelling wave tube.

Background

The broadband millimeter wave traveling wave tube is the most core critical component in radar and electronic countermeasure, and the cathode component of the broadband millimeter wave traveling wave tube is the heart component. The molybdenum cup-shaped part is used for supporting the cathode and accommodating the thermions, and has a complex structure and high processing difficulty. The lathe processing is adopted for a long time, the material is wasted, the precision is poor, and the yield is low.

Therefore, it is urgently needed to provide a method for preparing a molybdenum cup in a cathode assembly of a broadband millimeter wave traveling wave tube to solve the technical problem.

Disclosure of Invention

The invention aims to provide a preparation method of a molybdenum cup-shaped part in a cathode assembly of a broadband millimeter wave traveling wave tube, which better ensures the uniformity requirements of the flatness and the wall thickness of a part, not only improves the processing efficiency and the processing success rate of the part, but also reduces the labor cost and the material cost; meanwhile, the preparation method has wide usability, and can be used for processing thin-wall parts such as molybdenum, kovar, tantalum, niobium and the like with special material requirements.

In order to achieve the purpose, the invention provides a preparation method of a molybdenum cup-shaped piece in a cathode assembly of a broadband millimeter wave traveling wave tube, which comprises the following steps:

step 1, cutting a molybdenum sheet into required strips;

step 2, blanking the strip molybdenum sheet into a phi 14 circular molybdenum sheet by using a punch and a punching die;

step 3, carrying out ultrasonic cleaning on the molybdenum sheet blank obtained in the step 2 in an ultrasonic instrument;

step 4, placing the molybdenum sheet blank obtained in the step 3 into a chemically polished molten liquid for acid cleaning, drying, and then placing into a vacuum high-frequency hydrogen annealing furnace for annealing treatment;

step 5, pressing the molybdenum sheet blank processed in the step 4 on a primary spinning tool, smearing oil and heating by using an alcohol burner, starting a lathe, pressing the molybdenum sheet blank by using a brass spinning rod, and rotating along with a main shaft of the lathe to form a primary spinning blank;

step 6, carrying out acid washing and hydrogen annealing on the primary spinning blank obtained in the step 5;

step 7, placing the primary spinning blank processed in the step 6 on a secondary spinning tool, smearing oil and heating by using an alcohol burner, starting a lathe, pressing the molybdenum sheet blank by using a brass spinning rod, and rotating along with a main shaft of the lathe to form a secondary spinning blank;

step 8, performing lathe processing on the secondary spinning blank;

step 9, carrying out acid washing and hydrogen annealing on the secondary spinning blank processed in the step 8;

step 10, placing the secondary spinning blank processed in the step 9 on a tertiary spinning tool, smearing oil and heating by using an alcohol lamp, starting a lathe, pressing the molybdenum sheet blank by using a brass spinning rod, and rotating along with a main shaft of the lathe to form a tertiary spinning blank;

step 11, clamping the three-time spinning blank obtained in the step 10 on a movable top on a lathe by using a core rod, pressing by using a pressing block, and turning an outer circle;

step 12, clamping the blank processed in the step 11 by using a spring chuck, and cutting an end face by using a fast moving wire;

step 13, carrying out acid washing and hydrogen annealing on the blank processed in the step 12;

step 14, machining by a lathe;

step 15, secondary lathe machining;

and step 16, obtaining the final part after slow wire feeding processing.

Preferably, removing the peripheral burrs of the circular molybdenum sheet is further included after the step 2 and before the step 3.

Preferably, the ultrasonic cleaning in step 3 is followed by water removal and drying.

Preferably, in the step 8, the outer circle phi 2.4 and the fillet R0.2 are turned when the secondary spinning blank is subjected to lathe processing.

Preferably, the outer circle φ 7.3 is turned in step 11.

Preferably, the cutting of the end face with the fast moving wire in step 12 ensures 3 mm.

Preferably, the lathing in step 14 comprises: boring a spring chuck according to the excircle of the part blank, putting the blank processed in the step 13 into the spring chuck, protecting a phi 7 inner hole by using a first plug block, protecting a phi 2 inner hole by using a second plug block, and turning the end face to be smooth; and then taking down the part blank, protecting a phi 7 inner hole by using a first plug block, reversely clamping, turning an end face, ensuring that the thickness of the bottom face is 0.1mm, and boring a phi 2 hole.

Preferably, the secondary lathing in step 15 comprises: and (3) positioning the blank part obtained in the step (14) by using a hole phi 2, tightly pushing two sides of the blank part by using a jacking block with the thickness of 0.1, and removing burrs after finely turning an excircle phi 7.2.

Preferably, step 16 includes clamping the part blank obtained in step 15 by using a spring chuck, and cutting the end face by using a slow-moving wire to ensure that the total length is 2.6 mm.

According to the technical scheme, the molybdenum sheet is cut into required strips, and the circular molybdenum sheet is blanked by a die for a punch press. And carrying out ultrasonic cleaning on the molybdenum sheet blank in an ultrasonic instrument, and then dehydrating and drying. And (3) placing the dried blank into a chemical polishing solution for acid washing, and placing the dried blank into a vacuum high-frequency hydrogen annealing furnace for annealing treatment. And pressing the annealed blank on a one-step spinning tool, smearing oil on the molybdenum sheet blank, heating for a certain time by using an alcohol lamp, starting a lathe, pressing the molybdenum sheet blank by using a brass spinning rod, and rotating along with a main shaft of the lathe to form the required conical spinning blank. And repeating the steps 3 and 4 to process the primary spinning blank. And (5) placing the processed blank on a secondary spinning tool, and repeating the step 5 to form the required secondary spinning blank. And (5) turning the secondary spinning blank. And repeating the steps 3 and 4 to process the primary spinning blank. And (5) placing the processed blank on a three-time spinning tool, and repeating the step 5 to form the required three-time spinning blank. Turning the disposable core rod, and turning the three-time spinning blank. And cutting the end face by slow wire feeding to obtain the final part. The whole processing technology is improved from conventional lathe processing to spinning processing, so that the material utilization rate is improved, and the processing cost is reduced.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a diagram of a spinning process in a method for manufacturing a molybdenum cup in a cathode assembly of a broadband millimeter wave traveling wave tube provided by the invention;

FIG. 2 is a diagram of a secondary spinning process in a method for manufacturing a molybdenum cup in a cathode assembly of a broadband millimeter wave traveling wave tube provided by the invention;

FIG. 3 is a diagram of three spinning processes in a method for manufacturing a molybdenum cup in a cathode assembly of a broadband millimeter wave traveling wave tube provided in the present invention;

FIG. 4 is a schematic processing diagram of step 5 in the method for preparing the molybdenum cup in the cathode assembly of the broadband millimeter wave traveling wave tube provided in the present invention;

FIG. 5 is a schematic processing diagram of step 7 in the method for manufacturing the molybdenum cup in the cathode assembly of the broadband millimeter wave traveling wave tube provided in the present invention;

FIG. 6 is a schematic processing diagram of step 8 in the method for manufacturing the molybdenum cup in the cathode assembly of the broadband millimeter wave traveling wave tube provided in the present invention;

FIG. 7 is a schematic processing diagram of step 10 in the method for manufacturing a molybdenum cup in a cathode assembly of a broadband millimeter wave traveling wave tube provided in the present invention;

FIG. 8 is a schematic processing diagram of step 11 in the method for manufacturing the molybdenum cup in the cathode assembly of the broadband millimeter wave traveling wave tube provided in the present invention;

FIG. 9 is a schematic processing diagram of step 12 in the method for manufacturing the molybdenum cup in the cathode assembly of the broadband millimeter wave traveling wave tube provided in the present invention;

FIG. 10 is a schematic processing diagram of step 14 in the method for manufacturing the molybdenum cup in the cathode assembly of the broadband millimeter wave traveling wave tube provided in the present invention;

FIG. 11 is a schematic processing diagram of step 15 in the method for manufacturing the molybdenum cup in the cathode assembly of the broadband millimeter wave traveling wave tube provided in the present invention;

fig. 12 is a schematic processing diagram of step 16 in the method for preparing the molybdenum cup in the cathode assembly of the broadband millimeter wave traveling wave tube provided in the present invention.

Description of the reference numerals

1-one-step spinning tool

2-secondary spinning tool

3-three-time spinning tool

4-briquetting

5-top

6-movable top

7-brass spinning rod

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, unless otherwise specified, the directional words "upper, lower, inner, outer" and the like included in the terms merely represent the orientation of the terms in a conventional use state or are colloquially understood by those skilled in the art, and should not be construed as limiting the terms.

Referring to fig. 1 to 3, the invention provides a method for preparing a molybdenum cup in a cathode assembly of a broadband millimeter wave traveling wave tube, comprising the following steps:

step 1, cutting a molybdenum sheet into required strips;

step 2, blanking the strip molybdenum sheet into a phi 14 circular molybdenum sheet by using a punch and a punching die;

step 3, carrying out ultrasonic cleaning on the molybdenum sheet blank obtained in the step 2 in an ultrasonic instrument;

step 4, placing the molybdenum sheet blank obtained in the step 3 into a chemically polished molten liquid for acid cleaning, drying, and then placing into a vacuum high-frequency hydrogen annealing furnace for annealing treatment;

step 5, pressing the molybdenum sheet blank processed in the step 4 on the primary spinning tool 1, smearing oil and heating by using an alcohol lamp, starting a lathe, pressing the molybdenum sheet blank by using a brass spinning rod 7, and rotating along with a main shaft of the lathe to form a primary spinning blank (as shown in fig. 4);

step 6, carrying out acid washing and hydrogen annealing on the primary spinning blank obtained in the step 5;

step 7, placing the primary spinning blank processed in the step 6 on a secondary spinning tool 2, applying oil and heating by using an alcohol lamp, starting a lathe, pressing the molybdenum sheet blank by using a brass spinning rod 7, and rotating along with a main shaft of the lathe to form a secondary spinning blank (shown in figure 5);

step 8, performing lathe processing on the secondary spinning blank;

step 9, carrying out acid washing and hydrogen annealing on the secondary spinning blank processed in the step 8;

step 10, placing the secondary spinning blank processed in the step 9 on a tertiary spinning tool 3, smearing oil and heating by using an alcohol lamp, starting a lathe, pressing the molybdenum sheet blank by using a brass spinning rod 7, and rotating along with a main shaft of the lathe to form a tertiary spinning blank (as shown in fig. 7);

step 11, clamping the three-time spinning blank obtained in the step 10 on a movable top 6, a top 5 and a pressing block 4 on a lathe by using a core rod for pressing, and turning an outer circle;

step 12, clamping the blank processed in the step 11 by using a spring chuck, and cutting an end face by using a fast moving wire;

step 13, carrying out acid washing and hydrogen annealing on the blank processed in the step 12;

step 14, machining by a lathe;

step 15, secondary lathe machining;

and step 16, obtaining the final part after slow wire feeding processing. Wherein the content of the first and second substances,

removing peripheral burrs of the circular molybdenum sheet after the step 2 and before the step 3.

And (3) after the ultrasonic cleaning in the step (3), carrying out water removal and drying.

In step 8, the secondary spinning blank is turned with an excircle phi of 2.4 and a fillet R of 0.2 during lathe processing, as shown in FIG. 6.

As shown in FIG. 8, the outer circle φ 7.3 is turned in step 11.

The end face is cut with a fast moving wire to ensure 3mm in step 12, see fig. 9.

As shown in fig. 10, the lathe machining in step 14 includes: boring a spring chuck according to the excircle of the part blank, putting the blank processed in the step 13 into the spring chuck, protecting a phi 7 inner hole by using a first plug block, protecting a phi 2 inner hole by using a second plug block, and turning the end face to be smooth; and then taking down the part blank, protecting a phi 7 inner hole by using a first plug block, reversely clamping, turning an end face, ensuring that the thickness of the bottom face is 0.1mm, and boring a phi 2 hole.

As shown in fig. 11, the secondary lathing in step 15 includes: and (3) positioning the blank part obtained in the step (14) by using a hole phi 2, tightly pushing two sides of the blank part by using a jacking block with the thickness of 0.1, and removing burrs after finely turning an excircle phi 7.2.

As shown in fig. 12, step 16 includes clamping the part blank obtained in step 15 with a collet chuck, and cutting the end face with a slow-moving wire to ensure a total length of 2.6 mm.

The spinning tool is made of Cr12 material, is wear-resistant and not easy to deform, and can be used for a long time. The brass core rod is made of brass, so that the surface of a part blank can be effectively prevented from being scratched in the spinning process.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.