Thin-wall type large-length-diameter-ratio pressure-bearing container clamping protection device and using method

Abstract

The invention relates to the technical field of manufacturing of thin-wall type large-length-diameter-ratio pressure-bearing containers, in particular to a thin-wall type large-length-diameter-ratio pressure-bearing container clamping protection device. The protection device is composed of an outer sleeve, an elastic ring, an inner supporting ring, a supporting ring, a lining, a jackscrew, a pressing plate and a fastening bolt, the outer sleeve, the elastic ring and the pressing plate are connected into a whole through the fastening bolt, and the elastic ring is adjusted in the radial direction by adjusting the fastening bolt to extrude a gap between the pressing plate and the outer sleeve 1; the inner supporting ring is radially adjustable to fix the outer diameter of a workpiece through the compression effect of the fastening bolt on the elastic ring, and the bushing is radially adjustable to fix the inner diameter of the workpiece by adjusting the jackscrew. The situation that the machining precision is affected by product deformation caused by an improper traditional clamping mode is avoided, and the product quality is improved; the method is more flexible, and the problem of deformation in the machining forming process of a thin-wall structure product is solved; the device is used for clamping and protecting thin-wall type large-length-diameter-ratio pressure-bearing containers of different specifications, and the universality of the device is achieved.

Description

Technical Field

[0001] This invention relates to the field of manufacturing technology for thin-walled pressure vessels with a large length-to-diameter ratio, and specifically to a clamping and protection device for thin-walled pressure vessels with a large length-to-diameter ratio and its usage method. Background Technology

[0002] Thin-walled pressure vessels with a large length-to-diameter ratio often present difficulties in machining. Due to the thin walls and large length-to-diameter ratio of the workpiece, if the workpiece is directly clamped and machined without the use of tooling for clamping and protection, improper clamping and uneven force will often lead to local stress concentration and deformation of the workpiece. This will have a significant impact on the accuracy and quality of subsequent product machining. Furthermore, due to the excessive length of the workpiece, the clamping position must be adjusted during machining. This results in numerous challenges in the design of clamping and protection tooling for the machining of thin-walled pressure vessels with a large length-to-diameter ratio, as well as the need for convenient and quick operation.

[0003] Currently, most thin-walled cylindrical pressure vessels are clamped and protected at one end of the workpiece before turning and machining by placing a copper sheet on the three-jaw chuck of the lathe, while the other end of the workpiece is restrained by the inner bore of the workpiece supported by the tapered center of the lathe. See the appendix for the clamping and protection method. Figure 1 As shown, although this clamping method can avoid damage to the product during clamping and processing to a certain extent, the contact area between the three-jaw chuck and the workpiece is too small. During clamping, the workpiece is prone to deformation due to uneven force. Therefore, it is not suitable for clamping and protection of thin-walled pressure vessels with large length-to-diameter ratio before machining, which have high processing accuracy and high quality requirements.

[0004] There is currently no good solution for ensuring that thin-walled pressure vessels with a large length-to-diameter ratio are not deformed during turning and machining. The common approach is to use a lathe three-jaw chuck with copper pads to fix one end of the workpiece, while the other end is constrained by a tapered center on the lathe bearing inside the workpiece's bore. This solution has the following problems: When a lathe uses a three-jaw chuck to directly clamp a thin-walled workpiece with a large length-to-diameter ratio, it is prone to irreversible deformation due to improper clamping. Deformation of a thin-walled workpiece with a large length-to-diameter ratio has a great impact on the accuracy and quality of the internal threads in subsequent machining. The machining process of a thin-walled workpiece with a large length-to-diameter ratio requires clamping and protective fixtures. Summary of the Invention

[0005] Based on the above-mentioned technical problems, this invention proposes a clamping protection device for thin-walled pressure vessels with large length-to-diameter ratios. This device addresses the issue that thin-walled pressure vessels are prone to deformation during clamping, leading to poor internal thread accuracy and low pass rate in machined products. It controls deformation during subsequent internal thread machining processes, effectively reducing workpiece deformation caused by improper workpiece clamping and uneven force, which affects the machining accuracy of internal threads and the final quality of the product, thereby preventing unnecessary economic losses.

[0006] To address the aforementioned technical problems, one objective of this invention is to provide a clamping and protection device for thin-walled pressure vessels with a large length-to-diameter ratio. This device comprises an outer sleeve 1, an elastic ring 2, an inner support ring 3, a support ring 4, a bushing 5, a set screw 6, a pressure plate 7, and fastening bolts 8. The outer sleeve 1, the elastic ring 2 and the pressure plate 7 are connected into a whole by fastening bolts 8. The elastic ring 2 can be adjusted in the radial direction by adjusting the gap between the pressure plate 7 and the outer sleeve 1 by adjusting the fastening bolts 8 to squeeze the pressure plate 7. The gap between the pressure plate 7 and the outer sleeve 1 is adjusted by tightening the bolt 8, so that the elastic ring 2 compresses the bushing 5, thereby achieving radial compression and fixing the outer diameter of the workpiece. The inner support ring 3 and the support ring 4 are set at appropriate positions inside the thin-walled pressure vessel with a large length-to-diameter ratio to be processed. The inner support ring 3 is evenly compressed in the radial direction and the inner diameter of the workpiece is fixed by adjusting the set screw 6.

[0007] Furthermore, both the inner support ring and the bushing are made of LF6 aluminum alloy.

[0008] Furthermore, both the inner support ring and the bushing are segmented structures with adjustable diameters, providing clamping protection for the workpiece being held.

[0009] Furthermore, the elastic ring is made of elastic steel and designed and machined as a spring plate structure, which directly acts on the outer ring of the bushing.

[0010] Based on the same concept, this invention also proposes a method for using a thin-walled, high aspect ratio pressure vessel clamping and protection device, the specific steps of which are as follows: S1: Connect the outer sleeve, elastic ring, and pressure plate with fastening bolts to assemble them into a whole. The elastic ring can be adjusted in the radial direction by adjusting the gap between the pressure plate and the outer sleeve by squeezing the fastening bolts. S2: Install the inner support ring segments and support rings into suitable positions inside the thin-walled pressure vessel with a large length-to-diameter ratio to be processed. Adjust the set screws to evenly compress the inner support ring segments in the radial direction and fix the workpiece. S3: Install the thin-walled, high aspect ratio workpiece to be processed into the assembly assembled in step 1, with the middle section protected by a bushing. S4: Adjust the fastening bolts and set screws until the workpiece to be processed is fixed and clamped in place, then place the whole workpiece on the lathe to turn the special internal thread; S5: After the internal thread machining is completed, the workpiece and bushing can be disassembled by adjusting the loose elastic ring of the fastening bolt; S6: Adjusting the set screw loosens the inner support ring segment, allowing disassembly of the inner support ring segment and support ring. The entire disassembly process will not cause deformation of the thin-walled workpiece.

[0011] The above-described one or more technical solutions of the present invention have at least one or more of the following technical effects: This invention solves the problem of easy deformation of thin-walled pressure vessels with large length-to-diameter ratio during machining due to the lack of clamping and protective tooling. It avoids the deformation caused by improper clamping methods in traditional methods, which affects the processing accuracy and improves product quality. This invention offers greater flexibility. By installing the device on a thin-walled, high length-to-diameter pressure vessel to be processed, and controlling its deformation by adjusting the diameter, the problem of deformation during the machining process of thin-walled products is solved.

[0012] This invention is more versatile. The variable diameter adjustment and segmented structural design can clamp and protect thin-walled pressure vessels with large length-to-diameter ratios of different specifications within a certain radial range, thus achieving the versatility of the device. Attached Figure Description

[0013] Figure 1 : Schematic diagram of the machining clamping and protection device for thin-walled pressure vessels with large length-to-diameter ratio of the present invention; Figure 2 : Schematic diagram of the segmented structure of the internal support ring of the device of the present invention; Figure 3 : Schematic diagram of the bushing-type structure of the device of the present invention; Figure 4 : Front view of the elastic ring structure of the device of the present invention; Figure 5 : Front view of the elastic ring structure of the device of the present invention; Figure 6 : Model diagram of the machining clamping and protection device for thin-walled, high aspect ratio pressure vessels of this invention; Among them: 1-outer sleeve, 2-elastic ring, 3-inner support ring, 4-support ring, 5-shield, 6-set screw, 7-pressure plate, 8-fastening bolt. Detailed Implementation

[0014] This invention discloses a clamping and protection device for thin-walled pressure vessels with a large length-to-diameter ratio and adjustable diameter. The structure mainly consists of an outer sleeve, an elastic ring, a pressure plate, fastening bolts, an inner support ring, a support ring, a bushing, and set screws, as shown in Figure 2. The inner support ring and bushing are both made of LF6 aluminum alloy and are designed and machined as a segmented structure with adjustable diameter, providing clamping and protection for the clamped workpiece, as shown in Figure 3. The elastic ring is made of elastic steel and designed and machined as a spring-plate structure, directly acting on the outer ring of the bushing, as shown in Figure 4.

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments obtained. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0016] First, assemble the outer sleeve, elastic ring, and pressure plate into a whole using fastening bolts. By adjusting a series of fastening bolts to compress the gap between the pressure plate and the outer sleeve, the elastic ring can be adjusted in the radial direction. Install the inner support ring segments and support ring into suitable positions inside the thin-walled, high length-to-diameter ratio pressure vessel to be processed. Adjust the set screws to evenly compress the inner support ring segments in the radial direction and fix the workpiece. Install the installed thin-walled, high length-to-diameter ratio workpiece into the assembly assembled in step 1, with the bushing segments used for protection in between. Adjust the fastening bolts and set screws until the workpiece is fixed and clamped in place, then place the whole assembly on a lathe to machine special internal threads. After the internal threads are machined, loosen the elastic ring by adjusting the fastening bolts to disassemble the workpiece and bushing segments. Loosen the inner support ring segments by adjusting the set screws to disassemble the inner support ring segments and support ring. The entire disassembly process will not cause deformation of the thin-walled workpiece.

[0017] The disassembly device invented in this patent remains effective for clamping and protecting thin-walled pressure vessels with large length-to-diameter ratios before machining, regardless of their specifications. Since both the bushing and inner support ring are segmented structures, they can freely change diameter within a certain radial range. Therefore, this device can be universally used for clamping and protecting thin-walled pressure vessels with large length-to-diameter ratios of different specifications within the permissible radial range.

[0018] Practical application has proven the feasibility of the clamping protection device designed in this patent. It has been successfully used to clamp and protect a certain type of thin-walled, high length-to-diameter ratio pressure vessel before machining internal threads. The installation and disassembly of the device proceeded smoothly, and the product exhibited no deformation and high thread precision after machining, successfully completing the delivery and use of the product.

[0019] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations to the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A clamping and protection device for a thin-walled pressure vessel with a large length-to-diameter ratio, characterized in that, The protective device consists of an outer sleeve (1), an elastic ring (2), an inner support ring (3), a support ring (4), a bushing (5), a set screw (6), a pressure plate (7), and fastening bolts (8). The outer sleeve (1), elastic ring (2) and pressure plate (7) are connected as a whole by fastening bolts (8). The elastic ring (2) can be adjusted in the radial direction by adjusting the gap between the pressure plate (7) and the outer sleeve (1) by adjusting the fastening bolts (8). Adjust the gap between the pressure plate (7) and the outer sleeve (1) by tightening the bolts (8), so that the elastic ring (2) compresses the bushing (5), thereby achieving radial extrusion and fixing the outer diameter of the workpiece; The inner support ring (3) and the support ring (4) are set at appropriate positions inside the thin-walled pressure vessel with a large length-to-diameter ratio to be processed. The inner support ring (3) is evenly compressed in the radial direction and the inner diameter of the workpiece is fixed by adjusting the set screw (6).

2. The thin-walled, high aspect ratio pressure vessel clamping and protection device according to claim 1, characterized in that: Both the inner support ring and the bushing are made of LF6 aluminum alloy.

3. The thin-walled, high aspect ratio pressure vessel clamping and protection device according to claim 2, characterized in that: Both the inner support ring and the bushing are segmented structures with adjustable diameters, providing clamping protection for the workpiece.

4. The thin-walled, high aspect ratio pressure vessel clamping and protection device according to claim 1, characterized in that: The elastic ring is made of elastic steel and designed and machined as a spring plate structure, which directly acts on the outer ring of the bushing.

5. The method of using the thin-walled, high length-to-diameter ratio pressure vessel clamping and protection device according to any one of claims 1-4, characterized in that, The specific steps are as follows: S1: Connect the outer sleeve, elastic ring, and pressure plate with fastening bolts to assemble them into a whole. The elastic ring can be adjusted in the radial direction by adjusting the gap between the pressure plate and the outer sleeve by squeezing the fastening bolts. S2: Install the inner support ring segments and support rings into suitable positions inside the thin-walled pressure vessel with a large length-to-diameter ratio to be processed. Adjust the set screws to evenly compress the inner support ring segments in the radial direction and fix the workpiece. S3: Install the thin-walled, high aspect ratio workpiece to be processed into the assembly assembled in step 1, with the middle section protected by a bushing. S4: Adjust the fastening bolts and set screws until the workpiece to be processed is fixed and clamped in place, then place the whole workpiece on the lathe to turn the special internal thread; S5: After the internal thread machining is completed, the workpiece and bushing can be disassembled by adjusting the loose elastic ring of the fastening bolt; S6: Adjusting the set screw loosens the inner support ring segment, allowing disassembly of the inner support ring segment and support ring. The entire disassembly process will not cause deformation of the thin-walled workpiece.

Images