A three-limiting interface hoisting processing method for a launch vehicle valve shell

Abstract

The application provides a kind of launch vehicle valve housing three limit interface hoisting processing method, comprising: S1, design three limit interface position and size;S2, process three limit interface on valve housing blank;S3, install three limit standard connecting piece, install valve housing blank on machining center table top, carry out numerical control milling processing;S4, install valve housing semi-finished product with three limit interface on lathe spindle, and carry out turning processing;S5, cut off three limit interface on machining center, complete valve housing all processing.The application saves the part clamping time consumption to the maximum, reduces production and manufacturing cost;Eliminate the influence of clamping process on part processing quality, improve production efficiency while ensuring product quality;Strong application reference ability, similar feature parts can be used, convenient to use and high operation flexibility.

Description

Technical Field

[0001] This invention relates to the field of machining, and in particular to a method for hoisting and machining the three-limit interface of a launch vehicle valve shell. Background Technology

[0002] Valve housings are core components of a launch vehicle's pressurization and delivery system. Their primary function is to, during power output, allow high-pressure gas to pass through a pressure-reducing valve, undergoing two stages of pressure reduction before being output as a stable low-pressure fuel to fill the atmospheric pressure tank. The inlet and outlet pressures of the pressure-reducing valve control the fuel supply. The component's design involves multiple pipeline connections, resulting in numerous machining operations. Furthermore, to ensure the component's reliability, the machining requirements for threaded sealing features are extremely high. As a mechanism for precisely controlling rocket fuel supply, the valve housing directly affects the rocket's operational status; therefore, its machining quality and reliability are of paramount importance.

[0003] Valve body parts are consumable products with a large annual production volume. While different products share similar structures, slight differences exist. Due to the design requirements of their multi-pipeline connection structure and threaded sealing features, the entire production process requires a transfer between milling and turning. The parts are hexahedral in structure, requiring only a 90° rotation to change their state; therefore, they are commonly milled on three-axis machining centers. However, their threaded sealing features have high design requirements, necessitating lathe machining to meet these requirements. A total of 11 states are required to complete the machining process. The number of machining states increases exponentially with production volume. Ensuring the parts reliably and accurately appear in the machine tool's machining position under different processes and states is crucial to machining quality, and the repeatability of clamping accuracy is uncertain. Furthermore, the clamping process is a significant factor limiting machining efficiency, meaning that a universal and rapid clamping method is lacking throughout the production process.

[0004] There are currently two ways to improve this problem: (1) reduce the clamping state and change the processing equipment to use a mill-turn machining center or a five-axis machining center in conjunction with a turning machining center for production; (2) use special fixtures, such as 3R fixtures and zero-point positioning quick change systems for production.

[0005] Problems with using mill-turn machining centers or five-axis machining centers in conjunction with turning machining centers: (1) The machining process is heavily dependent on the equipment, and the flexibility of production process control is not high; (2) The equipment purchase cost is high, and the cost-effectiveness of input and output is low.

[0006] Problems with using special fixtures, 3R fixtures, zero-point positioning quick-change systems, etc. for processing: (1) low universality of fixture clamping, different parts need to be transitioned or transferred for installation, which is cumbersome; (2) not applicable between different processes; (3) high procurement cost.

[0007] Therefore, a completely new processing method is urgently needed to solve the manufacturing problem of valve bodies. Summary of the Invention

[0008] The purpose of this invention is to provide a method for hoisting and machining the three-limit interface of a launch vehicle valve shell, so as to solve the problem of rapid and reliable positioning and clamping machining of launch vehicle valve shell parts with certain differences in quantity and characteristics under different processes and conditions.

[0009] To solve the above-mentioned technical problems, the technical solution of the present invention is: to provide a method for hoisting and processing a three-limit interface of a launch vehicle valve shell, comprising the following steps:

[0010] S1. Based on the aforementioned launch vehicle valve housing structure, design the positions and dimensions of the three limit interfaces;

[0011] S2. Based on the position and size of the three limiting interfaces designed in step S1, process the three limiting interfaces on the blank of the launch vehicle valve housing;

[0012] S3. Install the three-limit standard connector on the worktable of the machining center, and install the blank of the launch vehicle valve body with three-limit interface obtained in step S2 on the worktable of the machining center for CNC milling.

[0013] Using the three limit interfaces processed in step S2, the 90° flip in different states is accurately positioned.

[0014] S4. Install the three-limit standard connector on the lathe spindle, install the semi-finished launch vehicle valve housing with the three-limit interface on the lathe spindle, and perform turning machining.

[0015] S5. Cut off the three limiting interfaces on the machining center to complete the machining of the valve body.

[0016] Furthermore, in step S1, the design of the position and size of the three-limit interface must ensure that the three-limit interface is located on the blank surface of the part with hole features. The minimum size of this surface should be greater than or equal to 1 / 3 of the length of the part and outside the maximum envelope shape of the product.

[0017] Furthermore, in step S2, three limiting interfaces are machined on the blank of the launch vehicle valve housing:

[0018] Fix the vise fixture on the table of the three-axis machining center and set the corresponding limit blocks; clamp and fix the launch vehicle valve body and make it close to the limit blocks; set the coordinate system according to the process documents and mill the three limit interfaces; remove the vise and limit blocks and replace them with the corresponding standard connectors.

[0019] Furthermore, in step S3, the three-limit interface is connected to the three-limit standard connector through the anti-lifting bolt hole. The threaded connection length of the anti-lifting bolt is greater than or equal to 1.25 times the thread hole diameter, and the thread specification is less than or equal to 0.9 times the characteristic diameter of the product hole.

[0020] Furthermore, in step S3, the three limiting interfaces consist of three bosses that are distributed on the same plane, have the same width and height, and are arranged in a cross-shaped orthogonal pattern.

[0021] Furthermore, in step S3, a coordinate system is set according to the process document, the first state of the valve body is processed, the nut is opened after completion, the processing state is changed through the three limit interfaces, the nut is clamped by vertical flipping at 90°, the nut is locked and the second milling state is processed. The subsequent three states are completed by rotating the nut three times at 90° to complete the entire processing of this process.

[0022] Furthermore, in step S4, the standard lathe connector is fixedly installed to the lathe spindle. The height adjustment block is used to adjust the part to the center distance position required for machining the feature. The position is aligned and limited by the three limit interfaces. The part is fixed by tightening the nut and a counterweight is placed at its symmetrical position. The first threaded sealing feature of the part is machined. After completion, the nut is loosened, the part is rotated 180°, and it is re-fixed through the three limit interfaces to machine the second threaded sealing feature of the part.

[0023] Furthermore, in steps S3 and S4, the mounting surface of the three-limit standard connector has two grooves that are orthogonally distributed in a cross shape, with a width consistent with the width of the three-limit interface boss and a length and height greater than the boss size.

[0024] The beneficial effects of the three-limit interface hoisting and processing method for launch vehicle valve housing provided by this invention are:

[0025] The solution provided by this invention employs a three-limit interface hoisting method for machining valve shell parts of launch vehicles. Three limit blocks and positioning surfaces are used for alignment and positioning, and hoisting bolts are used for fastening and fixing, thereby achieving rapid and reliable installation of the parts. The machining state of the parts can be changed by flipping the positions of the three limit blocks and adjusting the center distance of the positioning surfaces, simplifying the clamping process and maximizing clamping efficiency. This machining method can be used in different states and processes, exhibiting strong applicability and flexibility; it also has strong capabilities for referencing and applying similar features between different parts. The positioning gap is adjusted by controlling the width of the three limit blocks to ensure repeatability and accuracy, resulting in low manufacturing costs and high reliability and efficiency. Clamping and machining can be completed using the parts' own structural features, effectively saving auxiliary clamping materials. Using this invention, a simple, reliable, flexible, low-cost, and efficient machining method can be achieved. Attached Figure Description

[0026] The invention will be further described below with reference to the accompanying drawings:

[0027] Figure 1 Schematic diagram of hoisting and processing of three-limit interface;

[0028] Figure 2 Interface settings location distribution diagram;

[0029] Figure 3 Interface features and standard connector structure diagram;

[0030] Figure 4 : Schematic diagram of milling process;

[0031] Figure 5 : Schematic diagram of turning process. Detailed Implementation

[0032] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the three-limit interface hoisting and processing method for launch vehicle valve housings proposed in this invention. The advantages and features of this invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, and are only used to facilitate and clarify the illustration of the embodiments of this invention.

[0033] The core idea of ​​this invention is to provide a fast, reliable, low-cost, and universal machining method. It maximizes the saving of part clamping time, reducing production and manufacturing costs; eliminates the impact of the clamping process on part machining quality, improving production efficiency while ensuring product quality; it has strong application and reference capabilities, can be used for parts with similar features, and is convenient and highly flexible in operation.

[0034] Example 1

[0035] refer to Figure 1 The present invention provides a method for hoisting and machining a three-limit interface of a launch vehicle valve shell, which includes the following steps:

[0036] Step 1: Based on the valve body structure, design the location and dimensions of the three limit interfaces;

[0037] refer to Figure 2 Based on the valve body structure and the machining accuracy requirements of the drawings, the positioning reference surface (M) is confirmed to have a length ratio of 1:2.6 to the overall length of the part, and there is a hole feature (N) for setting the lifting thread hole; the three limit interfaces are located on the blank surface of the part with the hole feature, and outside the maximum envelope shape of the product, the thread connection length of its hole feature (N) is greater than or equal to 1.25 times the thread hole diameter, and the thread specification is less than or equal to 0.9 times the diameter of the product hole feature;

[0038] refer to Figure 3 The three limit interfaces are distributed on the same plane, with the same width and height dimensions: length (C): 6-13mm, width (K): Thickness (S): 2.5mm, consisting of three bosses arranged in a cross orthogonal pattern, with their central axes at 90°±5′ intervals and symmetrical with the center of the lifting hole; the lifting hole is M12X1.5 with a depth of 15mm.

[0039] Step 2: Machining three limit interfaces on the valve body blank;

[0040] Fix the vise fixture on the table of the three-axis machining center and set the corresponding limit blocks; clamp and fix the valve body and make it close to the limit blocks; set the coordinate system according to the process documents and mill the three limit interfaces; remove the vise and limit blocks and replace them with the corresponding standard connectors.

[0041] refer to Figure 3 Standard connectors can be purchased directly or made in-house. The two mounting surfaces are at 90° angles to each other, and the end faces have two grooves arranged in a cross shape with the width of the three limit interface bosses being the same. Bolt holes (diameter Ф13) for hoisting are provided at the symmetrical center of the two slots.

[0042] Step 3: Install the three-limit standard connector on the worktable of the machining center, install the valve body blank with the three-limit interface on the worktable of the machining center, and perform CNC milling. The 90° rotation in different states relies on the three-limit interface to ensure fast and accurate positioning.

[0043] refer to Figure 1 The part clamping method described in this embodiment of the invention is as follows: first, the double-ended bolt 3 is installed in the pre-processed valve body blank 2, and then it is installed with the fixed standard connecting piece 5. The position is aligned and limited by three limiting blocks 1, and then fixed with nuts 5. The clearance fit between the standard connecting piece 5 and the three limiting blocks 1, and the ratio of the positioning reference surface to the length of the valve body blank 2 are used to control its repeatability to meet the processing requirements.

[0044] refer to Figure 4 According to the process document, the coordinate system is set up, and the valve body is processed in the first state. After completion, the nut is opened, and the processing state is changed through the three limit interfaces. The valve body is clamped by vertical flipping 90° and the nut is locked to process the second milling state. The subsequent three states are completed by rotating 90° three times to complete all the processing content of this process.

[0045] Step 4: Install the three-limit standard connector on the lathe spindle, install the valve body semi-finished product with the three-limit interface on the lathe spindle, and perform turning machining;

[0046] refer to Figure 5 The lathe standard connector is fixedly installed to the lathe spindle. The height adjustment block is used to adjust the part to the center distance position required for machining the feature (L1 = 86mm). The position is aligned and limited by the three limit interfaces. The nut is tightened to fix it. A counterweight is placed at its symmetrical position. The first threaded sealing feature of the part is machined. After that, the nut is loosened, the part is rotated 180°, and it is re-fixed through the three limit interfaces to machine the second threaded sealing feature of the part.

[0047] After the threaded sealing features at the two locations with the same center distance are machined, the height adjustment block is readjusted and the center distance is adjusted (L2 = 35mm). The parts are then installed and re-weighted. Referring to the turning methods of the two states mentioned above, the remaining threaded sealing features are machined.

[0048] Step 5: Cut off the three limit interfaces on the machining center to complete the machining of the valve body.

[0049] Fix the vise and limit support on the machining center workbench, clamp and install the valve body parts, and mill away the remaining three limit interfaces on the parts to complete the machining of the valve body.

[0050] The contents not described in detail in this specification are prior art known to those skilled in the art. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A method for hoisting and machining a three-limit interface for a launch vehicle valve shell, characterized in that, Includes the following steps: S1. Based on the aforementioned launch vehicle valve housing structure, design the position and dimensions of the three limiting interfaces; wherein, when designing the position and dimensions of the three limiting interfaces, it is necessary to ensure that the three limiting interfaces are located on the blank surface of the part with hole features, the minimum dimension of this surface should be greater than or equal to 1 / 3 of the part length, and outside the maximum envelope shape of the product; S2. Based on the position and size of the three limiting interfaces designed in step S1, process the three limiting interfaces on the blank of the launch vehicle valve housing; S3. Install the three-limit standard connector on the worktable of the machining center, and install the blank of the launch vehicle valve body with three-limit interface obtained in step S2 on the worktable of the machining center for CNC milling. Using the three limit interfaces processed in step S2, the 90° flip in different states is accurately positioned. The three-limit interface is connected to the three-limit standard connector through the anti-lifting bolt holes; the three-limit interface consists of three bosses distributed on the same plane, with the same width and height, and arranged in a cross orthogonal pattern; the three-limit standard connector has two mounting surfaces that are 90° right angles to each other, and the end face has two grooves with the same width as the bosses of the three-limit interface, arranged in a cross orthogonal pattern, and bolt holes for lifting are left at the symmetrical center of the two grooves; S4. Install the three-limit standard connector on the lathe spindle, install the semi-finished launch vehicle valve housing with the three-limit interface on the lathe spindle, and perform turning machining. S5. Cut off the three limiting interfaces on the machining center to complete the machining of the valve body.

2. The method for hoisting and processing the three-limit interface of a launch vehicle valve shell as described in claim 1, characterized in that, In step S2, three limiting interfaces are machined on the blank of the launch vehicle valve housing: Fix the vise fixture on the table of the three-axis machining center and set the corresponding limit blocks; clamp and fix the launch vehicle valve body and make it close to the limit blocks; set the coordinate system according to the process documents and mill the three limit interfaces; remove the vise and limit blocks and replace them with the corresponding standard connectors.

3. The method for hoisting and processing the three-limit interface of a launch vehicle valve shell as described in claim 1, characterized in that, In step S3, the threaded connection length of the anti-lifting bolt is greater than or equal to 1.25 times the thread hole diameter, and the thread specification is less than or equal to 0.9 times the characteristic diameter of the product hole.

4. The method for hoisting and processing the three-limit interface of a launch vehicle valve shell as described in claim 1, characterized in that, In step S3, the coordinate system is set according to the process document, the valve body is processed in the first state, the nut is opened, the processing state is changed through the three limit interfaces, the nut is clamped by vertical flipping 90°, the nut is locked and the second milling state is processed. The subsequent three states are completed by rotating 90° three times to complete the entire process.

5. The method for hoisting and processing the three-limit interface of a launch vehicle valve shell as described in claim 1, characterized in that, In step S4, the three-limit standard connector is fixedly installed with the lathe spindle. The height adjustment block is used to adjust the part to the center distance position required for machining features. The position is aligned and limited by the three-limit interface. The nut is tightened to fix it. A counterweight is placed at its symmetrical position. The first threaded sealing feature of the part is machined. After completion, loosen the nut, rotate the part 180°, re-fix it through the three limit interfaces, and process the second threaded sealing feature of the part.

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