Fixture for welding thin-wall end cover and barrel
By introducing an inert protective gas into the welding fixture between the thin-walled end cap and the cylinder, the problem of weld quality defects was solved, the weld strength and welding safety were improved, and the rework rate and cost were reduced.
Patent Information
- Application Number
- CN202423165244.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-21
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-12-21
AI Technical Summary
When welding thin-walled end caps and cylinders, existing technologies are prone to weld quality defects such as penetration, burn-through, and oxidation of the back weld, which leads to reduced weld strength and poses safety hazards.
Design a fixture including a workpiece support block, a workpiece clamping mechanism, and an end cap fixing mechanism. By introducing an inert protective gas into the back of the weld, the reaction between air and the weld is isolated, forming a gas protective cavity to ensure welding quality.
Improve weld quality, reduce product defect rate and scrap rate, lower rework costs, enhance weld strength, and ensure welding safety.
Smart Images
Figure CN223811724U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of clamps of thin-wall end cover and cylinder welding, especially a kind of clamp of end cover and cylinder welding with wall thickness less than or equal to 0.9mm, applied to the field of automobile exhaust system manufacturing and related structure use. BACKGROUND
[0002] At present, when the cylinder and end cover (wall thickness less than 0.9mm) for automobile are welded, the welding protection gas is used, which is the gas protection welding pool technology of welding gun. This method is easy to produce welding quality defects in weld, such as penetration, burning through and back weld oxidation, which leads to the reduction of weld strength. The welded workpiece may crack due to the vibration and jolt of vehicle body during use, which may cause potential safety accidents. SUMMARY
[0003] The utility model aims at providing a kind of clamp of thin-wall end cover and cylinder welding, which is used for welding end cover and cylinder with wall thickness less than or equal to 0.9mm. Welding protection gas is also used on the back of workpiece during welding. This clamp has the advantages of reducing the repair rate of unqualified products, reducing the repair cost, reducing the scrap rate of products, improving the quality of weld and increasing the strength of weld.
[0004] The technical scheme of the utility model is as follows: a kind of clamp of thin-wall end cover and cylinder welding, which includes three parts of workpiece support block, workpiece pressing mechanism and end cover fixing mechanism. The workpiece pressing mechanism includes pressing cylinder and workpiece pressing block. The workpiece support block and workpiece pressing mechanism are fixed on the lower part and upper part of base plate respectively. The end cover fixing mechanism is symmetrically arranged on the base plate. The end cover fixing mechanism is fixed on the clamp base plate. The end cover fixing mechanism includes sliding cylinder, slide rail, bottom plate and end cover fixing plate assembly. The end cover fixing plate assembly is fixed on the bottom plate and installed above the slide rail. The pressing cylinder of workpiece pressing mechanism is fixed on the upper surface of base plate and connected with workpiece pressing block. The bottom plate of end cover fixing plate assembly is connected with sliding cylinder. The sliding cylinder drives the left and right movement of end cover fixing plate assembly, which is convenient for installing and uninstalling workpiece.
[0005] The end cover fixing plate assembly includes rhombic fixed block, adjusting gasket, adjusting block and protection gas inlet pipeline joint. The adjusting block is connected with four edges of rhombic fixed block through four adjusting gaskets. The outer edge of adjusting block forms a ring with adjustable size, which is inserted into workpiece end cover. Four holes are formed on the adjusting block and connected with four protection gas inlet pipeline joints through threads.
[0006] The adjusting block is provided with a protective gas inlet pipeline on the top, and four adjusting blocks are uniformly distributed with a plurality of protective gas outlets with a diameter of 4mm on the oval end face, and the uniformly distributed small holes are connected with each other through an annular channel to form a gas protection cavity connected with each other in the back of the welding seam.
[0007] The thickness of the adjusting pad between the rhombic fixing block and the adjusting block is adjusted to realize the connection.
[0008] The positive effect of the utility model is to isolate the air from the welding seam penetration or the potential penetration in the back of the welding seam and react with the molten pool, so as to avoid the generation of peroxide defects in the welding seam and improve the quality strength of the welding seam; the utility model has the advantages of reducing the repair rate of unqualified products, reducing the repair cost and reducing the product scrap rate. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 It is a front view of a normal end cover and a cylinder structure welding schematic diagram.
[0010] Figure 2 It is a top view of the end cover fixing mechanism.
[0011] Figure 3 It is a sectional view of the end cover fixing mechanism at A-A of the top view.
[0012] Figure 4 It is a sectional view of the end cover fixing mechanism at B-B of the top view.
[0013] Figure 5 It is a local enlarged view of the welding position. DETAILED DESCRIPTION
[0014] The utility model will be further described in combination with the drawings: as Figures 1-5 A kind of fixture for thin-wall end cover and cylinder welding, including workpiece support block 1, workpiece pressing mechanism 2 and end cover fixing mechanism 3 three major components, workpiece pressing mechanism 2 includes pressing cylinder 2-1 and workpiece pressing block 2-2, workpiece support block 1 and workpiece pressing mechanism 2 are fixed at the lower part and upper part of base plate 4 respectively, characterized in that: base plate 4 is symmetrically arranged with end cover fixing mechanism 3 left and right;End cover fixing mechanism 3 is fixed on fixture base plate 4;End cover fixing mechanism 3 is by sliding cylinder 3-1, slide rail 3-2, bottom plate 3-3, end cover fixing plate assembly 3-4, wherein end cover fixing plate assembly 3-4 is fixed on bottom plate 3-3 and is installed above slide rail 3-2, the pressing cylinder 2-1 of workpiece pressing mechanism 2 is fixed on the top of base plate 4 and is connected with workpiece pressing block 2-2, the bottom plate of end cover fixing plate assembly 3-4 is connected with sliding cylinder 3-1, sliding cylinder 3-1 drives end cover fixing plate assembly 3-4 to move left and right, facilitating installation and unloading workpiece;
[0015] The end cover fixing plate assembly 3-4 is composed of a rhombic fixing block 3-4-1, adjusting gaskets 3-4-2, adjusting blocks 3-4-3 and protective gas inlet pipeline joints 3-4-4; the adjusting blocks 3-4-3 are four blocks, connected with the four edges of the rhombic fixing block 3-4-1 through the four adjusting gaskets 3-4-2, the outer edges of the adjusting blocks 3-4-3 form a ring with adjustable size, inserted into the end cover of the workpiece, four holes are formed in the four adjusting blocks 3-4-3 and connected with the four protective gas inlet pipeline joints 3-4-4 through threads;
[0016] The adjusting blocks 3-4-3 are connected with the protective gas inlets 5, the four adjusting blocks 3-4-3 form an elliptical end face, a plurality of protective gas outlets 6 with a diameter of 4 mm are uniformly distributed on the end face, and the uniformly distributed small holes are connected with each other through an annular channel, forming a gas protection cavity 7 connected with each other in the back of the weld.
[0017] The rhombic fixing block 3-4-1 and the adjusting blocks 3-4-3 are connected through adjusting gaskets 3-4-2 with different thicknesses.
[0018] When the workpiece is clamped, manual, semi-automatic or robot automatic arc welding is carried out, the back inert protective gas interface is connected with the protective gas, and the size of the gas flow is adjusted according to different welding parameters, different base materials or external environment.
[0019] When the thin-walled end cover is overheated during welding, the base material at the back of the end cover weld will be in a liquid state or a solid-liquid mixed state, at this time, air will react with the metal.
[0020] Because of the optimized clamp design, the welding inert protective gas is connected to the back of the end cover of the base material to isolate air from reacting with the end cover in a liquid or solid-liquid mixed state, to ensure the quality of the weld and improve the welding strength.
Claims
1. A kind of thin-wall end cover and cylinder welding clamp, including workpiece support block, workpiece pressing mechanism and end cover fixed mechanism three major components, workpiece pressing mechanism includes pressing cylinder and workpiece pressing block, workpiece support block and workpiece pressing mechanism are fixed in the lower part and upper part of base plate respectively, it is characterized by: The end cover fixing mechanism is fixed on the fixture base plate, and the end cover fixing mechanism is composed of a sliding cylinder, a sliding rail, a bottom plate and an end cover fixing plate assembly. The end cover fixing plate assembly is fixed on the bottom plate and installed above the sliding rail. The pressing cylinder of the workpiece pressing mechanism is fixed above the base plate and connected with the workpiece pressing block. The bottom plate of the end cover fixing plate assembly is connected with the sliding cylinder. The sliding cylinder drives the end cover fixing plate assembly to move left and right.
2. The fixture for welding a thin-walled end cover to a cylinder shell according to claim 1, wherein The end cover fixing plate assembly is composed of a rhombic fixing block, adjusting washers, adjusting blocks and protection gas inlet pipeline joints. The adjusting blocks are connected with the four edges of the rhombic fixing block through four adjusting washers. The outer edges of the adjusting blocks form a ring with adjustable size, which is inserted into the end cover of the workpiece. Four holes are formed in the four adjusting blocks and connected with the four protection gas inlet pipeline joints through threads.
3. The fixture for welding a thin-walled end cover to a cylindrical shell according to claim 2, wherein The adjusting blocks are connected with the protection gas inlet pipeline. The four adjusting blocks form an elliptical end face, and a plurality of protection gas outlets with a diameter of 4 mm are uniformly distributed on the elliptical end face. The uniformly distributed small holes are connected with each other through an annular channel, forming a gas protection cavity connected with each other on the back of the welding seam.
4. The fixture for welding a thin-walled end cover to a cylindrical shell according to claim 2, wherein The thickness of the adjusting washers with different sizes is used to realize the connection between the rhombic fixing block and the adjusting blocks.