CN112405044A - Additional device of integral spinning type semi-spherical shell inner surface molding machine - Google Patents
Additional device of integral spinning type semi-spherical shell inner surface molding machine Download PDFInfo
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- CN112405044A CN112405044A CN202011313370.2A CN202011313370A CN112405044A CN 112405044 A CN112405044 A CN 112405044A CN 202011313370 A CN202011313370 A CN 202011313370A CN 112405044 A CN112405044 A CN 112405044A
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- pressing plate
- hemispherical shell
- base
- spinning type
- clamping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/066—Bench vices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention relates to the technical field of precision machining of the inner profile of an integral spinning type hemispherical shell, in particular to an additional device of an inner profile machine of the integral spinning type hemispherical shell, which comprises a flexible supporting mechanism, a vice clamping and correcting mechanism, an upper pressing plate assembly and a bottom pressing plate assembly, wherein the flexible supporting mechanism comprises a tool base, a groove for accommodating the integral spinning type hemispherical shell is recessed in the tool base, the vice clamping and correcting mechanism comprises a plurality of clamping and correcting assemblies, the upper pressing plate assembly comprises a plurality of upper pressing plate units, all the upper pressing plate units and the clamping and correcting assemblies are circumferentially distributed in a staggered manner around the end surface of the tool base, the bottom pressing plate assembly comprises a vertical seat at the center of the bottom of the groove, and a bottom pressing plate is arranged on the vertical seat in a threaded manner, so that the integral precision positioning and clamping of an end socket of the integral spinning type hemispherical shell are realized, and the inner profile machining is, the machining efficiency of the end socket of the quasi-hemispherical shell is improved, and the integrated batch manufacturing of the end socket of the quasi-hemispherical shell is realized.
Description
Technical Field
The invention relates to the technical field of precision machining of an inner molded surface of an integral spinning type semi-spherical shell, in particular to an additional device of an inner molded surface machine of the integral spinning type semi-spherical shell.
Background
The semi-spherical shell is a molded surface formed by rotating a circular curve, an elliptical curve or other circular curves around a central axis. The current integral spinning forming type hemispherical shell end socket is increasingly widely applied in the fields of pressure vessels, aerospace and the like, and has obvious advantages. Particularly in the field of aerospace, the medium-large diameter hemispherical shell end socket usually adopts a manufacturing mode of part split forming and integral tailor welding, and has a series of problems of more welding seams, more intermediate processing procedures, long flow, low integral manufacturing efficiency, lack of interchangeability and the like. The medium-large diameter hemispherical shell end socket adopts an improved scheme of an integrated manufacturing process of integral spinning forming and then machining, so that the manufacturing period and the manufacturing cost can be obviously reduced, and the interchangeability and the batch production capacity of products are improved.
A semi-spherical shell end socket blank of a certain type is obtained in the early stage, and machine allowance is reserved inside and outside the blank relative to a theoretical graph, which is shown in attached figures 1 and 2. In order to meet the requirements of final wall thickness and related dimensions specified by design, after the end socket of the quasi-hemispherical shell is formed by spinning, the allowance of a blank is removed after the inner and outer molded surfaces are machined, and a final finished product is obtained, wherein the machining process is shown in an attached figure 3.
The existing clamping and positioning mode for integrally spinning the bottom blank cannot be completely attached to the clamp, and in the process of machining the inner molded surface, the position can shake to cause higher machining error, the accuracy of positioning and clamping the whole head of the hemispherical shell is lower, and the efficiency and the product percent of pass of the integrated batch manufacturing of the head of the quasi-hemispherical shell are lower.
The utility model discloses a sphere anchor clamps in processing of multi-petal formula hemisphere protection casing that application number is CN201720353149.7, it includes anchor clamps chassis, mould lamella and presss from both sides tight piece, and the upper portion on anchor clamps chassis is equipped with a plurality of mould lamellas, and the top of mould lamella is installed and is pressed from both sides tight piece, can accomplish the laminating completely between blank and the anchor clamps, but can't accomplish the calibration, can't be with blank leveling, leads to blank machining error higher, and the machining precision is still lower.
Disclosure of Invention
The invention aims to provide an additional molding machine for an integral spinning type hemispherical shell, aiming at the defects of the prior art.
In order to solve the above problems, the present invention provides the following technical solutions:
the utility model provides an additional device of profile machine in whole spinning type hemisphere casing, including flexible supporting mechanism, vice clamp correction mechanism, upper portion clamp plate subassembly and bottom clamp plate subassembly, flexible supporting mechanism is including fixture base, the fixture base indent has the recess that is used for holding type hemisphere casing, vice clamp correction mechanism is including a plurality of around fixture base terminal surface circumference isogonism fixed mounting at the tight school shape subassembly of clamp at fixture base top, upper portion clamp plate subassembly is including a plurality of around fixture base terminal surface circumference isogonism fixed mounting at the upper portion clamp plate unit at fixture base top, and all upper portion clamp plate units and the tight school shape subassembly of clamp distribute around recess terminal surface circumference is crisscross, bottom clamp plate subassembly is including the seat of standing at recess bottom center, the bottom clamp plate is installed to the seat upper thread.
Further, press from both sides tight school shape subassembly including fixed mounting at the base at fixture base top, outer briquetting and with outer briquetting sliding fit's interior briquetting, the base rotates installs accommodate the lead screw, accommodate the lead screw and the bottom threaded connection of outer briquetting, the upper portion threaded connection of outer briquetting has adjusting screw, adjusting screw's one end is rotated with interior briquetting and is connected, adjusting screw and adjusting screw's the central line is parallel to each other and the centre of a circle at the directional recess top of equal level.
Further, the upper pressing plate unit comprises a guide rod vertically installed at the top of the tooling base, a vertical screw rod and an upper pressing plate, the top of the tooling base is provided with a threaded hole in threaded connection with the vertical screw rod, and the upper pressing plate is provided with a guide hole for avoiding the guide rod and the vertical screw rod.
Furthermore, the top of the vertical seat is provided with a plurality of vertical upward hydraulic supporting cylinders, the center of the vertical seat is vertically provided with a compression screw rod, the bottom pressing plate is sleeved on the compression screw rod, and a nut is installed on the compression screw rod right above the bottom pressing plate in a threaded manner.
Further, still including the radial kicking block unit in upper portion that a plurality of distributes around the equal angular difference of recess terminal surface circumference, the radial kicking block unit in upper portion is including installing the screw thread seat at frock base top and with screw thread seat threaded connection's radial lead screw, the centre of a circle of the directional recess terminal surface of central line level of radial lead screw, the kicking block is installed in the one end rotation that radial lead screw is close to the recess.
Furthermore, still including a plurality of around the hinge pressure hook unit of the equal angular difference distribution of recess terminal surface circumference, the hinge is pressed the hook unit and is pressed the hook and pass through hinge and pressure hook articulated pull rod, the vertical setting of pull rod and bottom and the top threaded connection of frock base.
Furthermore, a plurality of hydraulic floating supporting cylinders are arranged in the groove of the tool base.
Furthermore, the outer pressing block is of an L-shaped structure, the inner pressing block is of a U-shaped structure, and the inner pressing block is reversely buckled right above the end part of the outer pressing block.
The invention relates to an additional device of an inner molded surface machine of an integral spinning type hemispherical shell, which has the following beneficial effects:
one is as follows: the invention realizes the whole accurate positioning and clamping of the quasi-hemispherical shell end socket and finally completes the machining of the inner profile surface, improves the machining efficiency of the quasi-hemispherical shell end socket and realizes the integrated batch manufacturing of the quasi-hemispherical shell end socket.
The second step is as follows: the flexible supporting mechanism adopts a hydraulic floating supporting cylinder system to flexibly and floatingly adjust and support the outer molded surface of the product, and the product fixing and clamping process is quick, accurate and efficient after the system maintains pressure;
and thirdly: the vice clamping and correcting mechanism is uniformly arranged on the large end face of the tool base, the distance between the inner pressing block and the outer pressing block is reduced through the adjusting screw rod to clamp a product, the inner pressing block and the outer pressing block are designed according to the inner and outer molded surfaces of the product in a copying manner, the contact surface is designed with a miniature sawtooth structure to ensure the pressing effect, and the vice clamping and correcting mechanism can adjust the positions of the inner and outer pressing blocks of the vice in real time to realize the correction of the bottom of the large end of the spinning bottom.
Fourthly, the method comprises the following steps: the upper pressing plate assembly and the bottom pressing plate assembly are combined, and the product is uniformly pressed onto the flexible supporting mechanism from top to bottom, so that the high-efficiency and stable clamping of the integral spinning hemispherical shell end socket product is realized, and the processing quality and the processing precision stability of the product are ensured.
And fifthly: the upper radial top block unit and the hinge hook pressing unit further assist product compaction and shape correction, are suitable for product series batch production, and integrate a plurality of functional modules such as flexible positioning, uniform compaction, large-end shape correction and the like, so that the rapid clamping of the integral spinning forming type hemispherical shell end socket is realized, and the integral processing efficiency of the inner profile is improved.
Drawings
FIG. 1 is a first schematic structural view of a head of a quasi-hemispherical shell;
FIG. 2 is a schematic structural diagram II of the head of the quasi-hemispherical shell;
FIG. 3 is a schematic view of a processing flow of the head of the quasi-hemispherical shell;
FIG. 4 is a top view of the present invention;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;
FIG. 6 is a schematic structural view of a hydraulic floating support cylinder and a tool base according to the present invention;
FIG. 7 is a schematic structural view of a vise clamping and shape correcting mechanism of the present invention;
FIG. 8 is a schematic structural view of the upper platen assembly of the present invention;
FIG. 9 is a schematic structural view of the bottom platen assembly of the present invention;
FIG. 10 is a schematic view of the upper radial plug unit of the present invention;
FIG. 11 is a schematic structural view of the hinge hook pressing unit according to the present invention;
description of reference numerals:
the flexible supporting mechanism 1, the tooling base 11, the hydraulic floating supporting cylinder 12, the vice clamping and shape correcting mechanism 2, the base 21, the outer pressing block 22, the inner pressing block 23, the adjusting screw rod 24, the adjusting screw rod 25, the upper pressing plate assembly 3, the guide rod 31, the vertical screw rod 32, the upper pressing plate 33, the bottom pressing plate assembly 4, the vertical seat 41, the bottom pressing plate 42, the pressing screw rod 43, the upper radial ejecting block unit 5, the threaded seat 51, the radial screw rod 52, the ejecting block 53, the hinge pressing hook unit 6, the pressing hook 61 and the pull rod 62.
Detailed Description
The following detailed description of specific embodiments of the present invention is made with reference to the accompanying drawings and examples:
referring to fig. 4 to 11, the additional molding machine for the integral spinning hemispherical shell comprises a flexible supporting mechanism 1, a vice clamping and shape correcting mechanism 2, an upper pressure plate assembly 3 and a bottom pressure plate assembly 4, the flexible supporting mechanism 1 comprises a tool base 11, a groove for accommodating the similar semi-spherical shell is recessed in the tool base 11, the vice clamping and shape correcting mechanism 2 comprises a plurality of clamping and shape correcting components which are fixedly arranged on the top of the tool base 11 in a manner of equal angle difference around the circumferential direction of the end surface of the tool base, the upper pressing plate component 3 comprises a plurality of upper pressing plate units which are fixedly arranged on the top of the tooling base 11 in a circumferential equal angle difference mode around the end surface of the groove, all the upper pressing plate units and the clamping shape correcting components are distributed in a circumferential staggered mode around the end surface of the tooling base, the bottom pressing plate assembly 4 comprises a vertical seat 41 arranged at the center of the bottom of the groove, and a bottom pressing plate 42 is installed on the vertical seat 41 in a threaded mode.
The blank of the end socket of the semi-spherical shell is added by a machine according to the theoretical requirements of drawings, in order to meet the requirements of the wall thickness of a final product and the relevant dimensions specified by the design, the inner profile machine of the integral spinning semi-spherical shell is additionally arranged, the blank of the integral spinning end socket is clamped and positioned in a bowl shape, a flexible supporting mechanism 1 of the device is used for tightly supporting the product and then maintaining pressure to form a fixed support, and the fixed support is adjusted and fixed by combining a pressing and shape correcting mechanism, so that the integral turning processing of the inner profile of the product is realized, the internal allowance of the blank is accurately removed, and the foundation is laid for the subsequent processing procedures and the integral mass manufacturing of the product.
According to the requirements of the overall processing technological process of the product, the inner profile of the spinning seal head blank is processed in the first step, and the wall thickness delta of the spinning seal head blank is pressed before the spinning seal head blank is processed0The allowance thickness of the blank inner profile and the theoretical semi-spherical shell inner profile required by design is delta1。
Clamping a blank piece to a tool base 11 of the integral turning of the inner profile in a bowl shape, pressing a product tightly by a hydraulic floating support cylinder 12 of a flexible support mechanism 1 to form a fixed support, adjusting and fixing through a combined pressing and shape correcting mechanism, and then integrally turning the inner profile.
Press from both sides tight school shape subassembly including base 21, external pressure piece 22 at tooling base 11 top and with external pressure piece 22 sliding fit's interior briquetting 23, adjusting screw 24 is installed in the rotation of base 21, adjusting screw 24 and external pressure piece 22's bottom threaded connection, the upper portion threaded connection of outer briquetting 22 has adjusting screw 25, adjusting screw 25's one end and interior briquetting 23 rotate to be connected, adjusting screw 25 and adjusting screw 24's central line are parallel to each other and the centre of a circle at the directional recess top of equal level.
The vice presss from both sides tight school shape mechanism 2 and is located frock base 11, presss from both sides tight school shape subassembly and presss from both sides tight product through adjusting screw 25 regulation inner pressure piece 23 and the distance of external pressure piece 22, and inner pressure piece 23 and external pressure piece 22 are according to the inside and outside profile modeling design of product, and the contact surface design has miniature sawtooth structure to ensure to compress tightly the effect.
The upper pressing plate unit comprises a guide rod 31 vertically installed at the top of the tooling base 11, a vertical screw rod 32 and an upper pressing plate 33, the top of the tooling base 11 is provided with a threaded hole in threaded connection with the vertical screw rod 32, and the upper pressing plate 33 is provided with a guide hole for avoiding the guide rod 31 and the vertical screw rod 32.
The top pressing plate unit is located on the upper flat plate of the tooling base 11, the top pressing plate unit is screwed through the vertical screw rod 32 to enable the pressing plate to tightly press the large end face of the product, the product is further pressed downwards to tightly attach to the positioning tread formed by the multiple groups of hydraulic floating supporting cylinders 12, and the product and the tread of the tooling base 11 cannot move in the product machining process.
The hydraulic support cylinder that the top of founding seat 41 is provided with the vertical up of a plurality of, the vertical center of founding seat 41 is installed and is compressed tightly lead screw 43, bottom clamp plate 42 cup joints on compressing tightly lead screw 43, compress tightly lead screw 43 and be located bottom clamp plate 42 and install the nut directly over the screw thread.
The top of the spinning seal head blank is provided with a central process hole, when an inner profile is machined, a product is inverted in a bowl shape, so that the central process hole is arranged at the lowest part and is close to the bottom of the inner profile tool base 11, a lower pressing plate unit is designed for ensuring that the product is better attached to a tire at the center of a lower flat plate of the tool, and a nut on a pressing screw rod 43 is rotated to press a bottom pressing plate 42 downwards. And (3) compressing the spinning seal head blank, applying downward pressure from the center of the product to enable the product to be attached to the tool base 11 tightly, and enabling the product and the tool base 11 not to mutually move in the machining process.
The tool base is characterized by further comprising a plurality of upper radial ejection block units 5 distributed in an equal angle difference mode in the circumferential direction of the end face of the tool base, wherein the upper radial ejection block units 5 comprise threaded seats 51 mounted at the top of the tool base 11 and radial lead screws 52 in threaded connection with the threaded seats 51, the circle center of the center line of each radial lead screw 52 points to the end face of the groove in the horizontal direction, and one ends, close to the grooves, of the radial lead screws 52 are rotatably mounted with ejection blocks 53.
8 radial kicking block unit 5 equipartitions in upper portion of group distribute on 11 tops of frock base, and 5 main functions of the radial kicking block unit in upper portion are: firstly, applying a jacking force during clamping and product processing ensures that the big end does not generate outward warping deformation, and secondly, applying a friction force in the product processing process further fixes the relative position of the product and the tread of the tool base 11 without generating relative leaping.
Still including a plurality of around the hinge pressure hook unit 6 of the equal angular difference distribution of frock base terminal surface circumference, hinge pressure hook unit 6 is including pressing hook 61 and through hinge and pressure hook 61 articulated pull rod 62, the vertical setting of pull rod 62 and the top threaded connection of bottom and frock base 11.
A plurality of groups of hinge pressure hook units 6 evenly distributed on the top of the tooling base 11 are attached to the large end face of a product through hinge overturning, the pressure hook 61 contacts the product and then the nut on the pull rod 62 is screwed down to enable the pressure hook 61 to press the large end face of the product downwards, and the auxiliary product is attached to a tire.
A plurality of hydraulic floating support cylinders 12 are arranged in the groove of the tool base 11, the hydraulic floating support cylinders 12 are spring-driven support cylinders, the outer molded surface of a product is flexibly and floatingly adjusted and supported by adopting a hydraulic floating support cylinder 12 system, and the product fixing and clamping process is quick, accurate and efficient after the pressure of the system is maintained;
the outer pressing block 22 is of an L-shaped structure, the inner pressing block 23 is of a U-shaped structure, the inner pressing block 23 is reversely buckled right above the end part of the outer pressing block 22, and the vice clamping and shape correcting mechanism 2 adopts the shape correcting principle: the adjusting screw rod 24 on the base 21 is rotated to enable the outer pressing block 22 to move towards the radial inner part of a product, the adjusting screw rod 24 is rotated to enable the inner pressing block 23 to move towards the radial outer part of the product, the product is clamped and fixed, the relative positions of the inner pressing block 23 and the outer pressing block 22 can be adjusted in real time in the product clamping and processing process, and the shape correction of the bottom of the large end of the spinning bottom is achieved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (8)
1. The utility model provides an add device of profile machine in whole spinning type hemisphere casing which characterized in that: comprises a flexible supporting mechanism (1), a vice clamping and correcting mechanism (2), an upper pressure plate component (3) and a bottom pressure plate component (4), the flexible supporting mechanism (1) comprises a tool base (11), a groove for accommodating the similar hemispherical shell is recessed in the tool base (11), the vice clamping and shape correcting mechanism (2) comprises a plurality of clamping and shape correcting components which are fixedly arranged on the top of the tool base (11) in a way of winding the circumferential direction of the end surface of the tool base with equal angular difference, the upper pressing plate component (3) comprises a plurality of upper pressing plate units which are fixedly arranged on the top of the tooling base (11) in a circumferential equal angle difference mode around the end surface of the groove, all the upper pressing plate units and the clamping shape correcting components are distributed in a circumferential staggered mode around the end surface of the tooling base, the bottom pressing plate assembly (4) comprises a vertical seat (41) arranged at the center of the bottom of the groove, and a bottom pressing plate (42) is installed on the vertical seat (41) in a threaded mode.
2. The integrated spinning type hemispherical shell inner profile machine as claimed in claim 1, wherein: press from both sides tight school shape subassembly including base (21), external pressure piece (22) of fixed mounting at frock base (11) top and with outer briquetting (22) sliding fit's interior briquetting (23), accommodate the lead screw (24) is installed in base (21), accommodate the lead screw (24) and the bottom threaded connection of outer briquetting (22), the upper portion threaded connection of outer briquetting (22) has adjusting screw (25), the one end and interior briquetting (23) of adjusting screw (25) rotate to be connected, the central line of adjusting screw (25) and accommodate the lead screw (24) is parallel to each other and the centre of a circle at the directional recess top of equal level.
3. The integrated spinning type hemispherical shell inner profile machine as claimed in claim 1, wherein: the upper pressing plate unit comprises a guide rod (31), a vertical screw rod (32) and an upper pressing plate (33), wherein the guide rod, the vertical screw rod (32) and the upper pressing plate (33) are vertically installed at the top of the tooling base (11), a threaded hole connected with the vertical screw rod (32) in a threaded mode is formed in the top of the tooling base (11), and the upper pressing plate (33) is provided with a guide hole used for avoiding the guide rod (31) and the vertical screw rod (32).
4. The integrated spinning type hemispherical shell inner profile machine as claimed in claim 1, wherein: the hydraulic support cylinder that the top of founding seat (41) is provided with the vertical up of a plurality of, the vertical center of founding seat (41) is installed and is compressed tightly lead screw (43), bottom clamp plate (42) cup joint on compressing tightly lead screw (43), compress tightly lead screw (43) and be located bottom clamp plate (42) directly over the screw thread and install the nut.
5. The integrated spinning type hemispherical shell inner profile machine as claimed in claim 1, wherein: still including radial kicking block unit (5) in upper portion that the angular difference such as a plurality of wind frock base terminal surface circumference distributes, radial kicking block unit (5) in upper portion including install screw thread seat (51) at frock base (11) top and with screw thread seat (51) threaded connection's radial lead screw (52), the centre of a circle of the directional recess terminal surface of central line level of radial lead screw (52), radial lead screw (52) are close to the one end rotation of recess and install kicking block (53).
6. The integrated spinning type hemispherical shell inner profile machine as claimed in claim 1, wherein: still press hook unit (6) including a plurality of hinge around the equal angular difference distribution of recess terminal surface circumference, hinge press hook unit (6) including press hook (61) and through hinge and press hook (61) articulated pull rod (62), the top threaded connection of pull rod (62) vertical setting and bottom and frock base (11).
7. The integrated spinning type hemispherical shell inner profile machine as claimed in claim 1, wherein: a plurality of hydraulic floating supporting cylinders (12) are arranged in the groove of the tool base (11).
8. The integrated spinning type hemispherical shell inner profile machine as claimed in claim 2, wherein: the outer pressing block (22) is of an L-shaped structure, the inner pressing block (23) is of a U-shaped structure, and the inner pressing block (23) is reversely buckled right above the end part of the outer pressing block (22).
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| CN202011313370.2A CN112405044B (en) | 2020-11-19 | 2020-11-19 | Integral spinning type hemispherical shell internal profile machining device |
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| CN202011313370.2A CN112405044B (en) | 2020-11-19 | 2020-11-19 | Integral spinning type hemispherical shell internal profile machining device |
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Cited By (3)
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| CN113751731A (en) * | 2021-08-31 | 2021-12-07 | 浙江蓝箭航天空间科技有限公司 | Inner-type turning process for bottom of rocket tank |
| CN114227149A (en) * | 2021-11-19 | 2022-03-25 | 中国船舶重工集团公司第七二五研究所 | High-precision machining tool and machining method for titanium alloy hemispherical assembly and welding piece |
| CN114888526A (en) * | 2022-04-06 | 2022-08-12 | 北京九天行歌航天科技有限公司 | Method for processing inner surface of box bottom of integral central imperforate rocket tank |
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