High-speed solenoid valve welding process

Abstract

The present invention relates to the technical field of high-speed solenoid valve welding, and specifically discloses a high-speed solenoid valve welding and assembling process, which includes the following steps: (1) Assembly, first respectively assemble relevant components into the inside of the valve seat, the magnetic isolation tube and the main shaft of the high-speed solenoid valve; (2) Fine adjustment of internal components, respectively perform position fine adjustment and fastening on the internal components of the end faces of the valve seat, the magnetic isolation tube and the main shaft, and then form a valve seat assembly, a magnetic isolation tube assembly and a main shaft assembly; (3) Outer body adjustment, adjust the relative position of the outer body of the valve seat assembly and / or the magnetic isolation tube assembly and / or the main shaft assembly; (4) Synchronous welding, perform synchronous welding on two connection seams. Using the present invention has the advantages of being able to ensure that the lift value of the product remains unchanged after welding, high precision, good lift consistency, significantly reducing the defective rate of the product, and significantly improving the quality of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed solenoid valve welding, and particularly to a welding and assembling process for high-speed solenoid valves. Background Art

[0002] A high-speed solenoid valve, also known as a high-speed switching valve, is a key actuating element in many current control systems. It is widely used in fields such as automobiles, for example, in the gas metering valve of an internal combustion engine. A high-speed solenoid valve generally includes a valve seat, a magnetic isolation tube, and a main shaft. It realizes rapid opening and closing by receiving control signals from an electronic control unit. Among them, the opening and closing speed (action time) and precise control of the rated flow are important indicators for measuring high-speed solenoid valves. In production, the core parameter of a high-speed solenoid valve is the valve stroke, which is called the lift in the industry term. This parameter directly determines the pulse flow of the high-speed solenoid valve. In mass production, the consistency of the lift is the core index that must be ensured first in production. The current production process is as follows: The valve seat is first pressed into the magnetic isolation tube. After adjusting the depth, these two parts are welded first, and then it flows to the next assembly process. Spare parts such as valve cores and springs are put in, then the main shaft is pressed in. After installing the limit tube, the depth of the limit tube is adjusted, and then the main shaft and the magnetic isolation tube are welded. In actual application, the above process has the following technical problems: 1. It is easy to cause changes in the lift after welding (the welding error should be controlled below the micron level); 2. In mass production, the lift consistency of high-speed solenoid valves is not good, and the rejection rate screened out after the subsequent flow detection link is too high. Summary of the Invention

[0003] Aiming at the above deficiencies, the present invention provides a welding and assembling process for high-speed solenoid valves that can ensure good lift consistency during the welding process.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A welding and assembling process for high-speed solenoid valves, comprising the following steps:

[0006] (1) Assembly, first assemble relevant spare parts into the interiors of the valve seat, magnetic isolation tube, and main shaft of the high-speed solenoid valve respectively;

[0007] (2) Fine adjustment of internal spare parts, respectively perform position fine adjustment and fastening on the internal spare parts of the end faces of the valve seat, the magnetic isolation tube, and the main shaft, thereby forming a valve seat assembly, a magnetic isolation tube assembly, and a main shaft assembly;

[0008] (3) Outer body adjustment. The internal gap between the valve seat assembly and the magnetic isolation tube assembly forms the first internal gap, and the internal gap between the magnetic isolation tube assembly and the main shaft assembly forms the second internal gap. A servo displacement control system is used to adjust the relative positions of the outer bodies of the valve seat assembly and / or the magnetic isolation tube assembly and / or the main shaft assembly with the first internal gap and / or the second internal gap as the adjustment target parameters.

[0009] (4) Synchronous welding. After the relative positions of the valve seat assembly, the magnetic isolation tube assembly, and the main shaft assembly are adjusted, the valve seat assembly and the magnetic isolation tube assembly form the first joint seam, and the magnetic isolation tube assembly and the main shaft assembly form the second joint seam. Synchronous welding is performed on the first joint seam and the second joint seam.

[0010] Preferably, in the outer body adjustment, the adjustment of the position of the valve seat assembly and / or the magnetic isolation tube assembly and / or the main shaft assembly by the adjustment working head of the servo displacement control system is monitored by a displacement sensor and then controlled until the adjustment is in place.

[0011] Preferably, in the outer body adjustment, the magnetic isolation tube assembly is fixed, and then the positions of the main shaft assembly and the valve seat assembly are adjusted.

[0012] Preferably, a fiber laser welding system is used for the synchronous welding.

[0013] Preferably, the fiber laser welding system is a fiber laser welding system provided with two core diameters and wavelengths. Preferably, the fiber laser welding system uses the same laser pulse source, and then a beam splitter is used to generate two laser beams to achieve the synchronous welding.

[0014] Preferably, in the synchronous welding of step (4), a rotating platform is used to perform synchronous rotary welding in a state of tightly pressing the workpiece.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. Adopting this welding process can ensure that the lift value of the product remains unchanged after welding, with high precision and good lift consistency, significantly reducing the defective rate of the product and significantly improving the quality of the product.

[0017] 2. The fiber laser welding system uses the same laser pulse source to ensure strict synchronization of the laser pulses, so that the laser pulses of the two weld seams, namely the first joint seam and the second joint seam, reach at the same moment, prompting the thermal stresses of the two weld seams to just cancel each other out, thereby effectively reducing the uncontrollable fluctuation of the thermal stress of the product shell material after high-temperature welding and reducing the impact on the welding precision of the welded body. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments.

[0019] Figure 1 It is a welding schematic diagram of the present invention using a fiber laser welding system. Specific embodiments

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0022] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The high-speed solenoid valve welding process includes the following steps:

[0024] (1) Assembly. First, assemble the relevant components into the inside of the valve seat, magnetic isolation tube and main shaft of the high-speed solenoid valve respectively. For example, press the filter screen into the main shaft through a servo pressing system, and then weld the filter screen firmly; assemble the injection plate to the valve seat, and at the same time, the valve core is assembled by a valve core assembly robot, and then use a precision fiber laser welding head to weld the valve core; and assemble and connect the coil assembly, sleeve, etc. inside the magnetic isolation tube.

[0025] (2) Fine adjustment of internal components: The internal components of the end faces of the valve seat, the magnetic isolation tube, and the main shaft are respectively subjected to precise position adjustment and fastening, thereby forming a valve seat assembly, a magnetic isolation tube assembly, and a main shaft assembly. For example, the spool is key-adjusted. The spool is placed between the valve seat assembly and the main shaft assembly and is a movable part. A limiting step is provided between the main shaft assembly and the magnetic isolation tube assembly. The valve seat assembly is within the magnetic isolation sleeve. During adjustment, the valve seat is servo-pushed. At this time, the spool is pressed against the valve seat by an internal spring. When the spool moves, the clearance value between the spool and the main shaft is measured by a sensor using existing technologies (for example, in currently disclosed measurement methods, a high-speed digital micrometer is used for measurement, etc. However, it should be noted that replacing the measurement with other current existing solutions also falls within the protection scope of this application). The assembly clearance between the valve seat and the main shaft determines the lift accuracy, so precise adjustment is required.

[0026] (3) Outer body adjustment: The internal clearance between the valve seat assembly and the magnetic isolation tube assembly forms a first internal clearance, and the internal clearance between the magnetic isolation tube assembly and the main shaft assembly forms a second internal clearance. The servo displacement control system uses the first internal clearance and / or the second internal clearance as the adjustment target parameters to adjust the relative positions of the outer bodies of the valve seat assembly and / or the magnetic isolation tube assembly and / or the main shaft assembly. In this embodiment, the adjustment operation head of the servo displacement control system can be monitored by a displacement sensor and controlled to adjust the positions of the valve seat assembly and / or the magnetic isolation tube assembly and / or the main shaft assembly until the adjustment is in place. In this embodiment, it is preferably to fix the magnetic isolation tube assembly first, and then adjust the positions of the main shaft assembly and the valve seat assembly. For a more specific operation, for example, when adjusting in cooperation with the spool, first, radial positioning is used for the parts positioning on the workbench, and the part diameter size is used for positioning. The servo system operates up and down. After the parts are radially positioned, they move axially. The positioning motor first rises, and the pre-tightening spring is compressed by a common tooling to make its positioning stable. Then the servo adjustment system starts to move axially for adjustment. During adjustment, the spool driver drives the spool to displace, and at the same time, the displacement sensor feeds back the value. When the set value is reached, the adjustment work stops.

[0027] (4) Synchronous welding: After the relative positions of the valve seat assembly, the magnetic isolation tube assembly, and the main shaft assembly are adjusted, the valve seat assembly and the magnetic isolation tube assembly form a first joint seam, and the magnetic isolation tube assembly and the main shaft assembly form a second joint seam. The first joint seam and the second joint seam are synchronously welded. Because the outer body adjustment is radial positioning and axial tightening, the adjusted parts are still on the workbench. Figure 1As shown, the rotating platform moves axially along with the adjustment. After the adjustment is completed, the workpiece has not separated and descended yet. In this embodiment, a fiber laser welding system is used for the synchronous welding. The fiber laser welding system is a fiber laser welding system provided with two sets of core diameters and wavelengths. The fiber laser welding system uses the same laser pulse source, and then uses a beam splitter to generate two laser beams to achieve the synchronous welding. The advantage of this solution is that: using the same laser pulse source ensures strict synchronization of the laser pulses, so that the laser pulses of the two weld seams, namely the first connection seam and the second connection seam, reach at the same moment, prompting the thermal stresses of the two weld seams to just cancel each other out, thereby effectively reducing the uncontrollable fluctuations of the thermal stress of the product shell material after high-temperature welding and reducing the impact on the welding accuracy of the welded body. When performing synchronous welding, at this time, the rotating platform performs synchronous rotary welding in the state of clamping the workpiece tightly.

[0028] The advantages of adopting the above solution of the present invention compared with the prior art are as follows: by first finely adjusting the internal components, and then being able to perform clamping adjustment on the outer body of the assembled body and accurately adjust according to the internal lift standard value of the high-speed solenoid valve, the adjustability of the lift in the welding section can be realized, ensuring the accuracy of the lift. At the same time, by using two laser beams from the same laser pulse source for synchronous welding, the influence generated during the welding process can be effectively reduced, and during the welding process, the rotating platform performs synchronous rotary welding in the state of clamping the workpiece tightly, which can also effectively prevent the influence of the welding process on the lift accuracy. Finally, it ensures good lift consistency of the product, significantly reduces the defective rate of the product, and significantly improves the quality of the product.

Claims

1. High-speed solenoid valve welding process, characterized in that, The steps are as follows: (1) Assembly: First, assemble the relevant components into the inside of the valve seat, the magnetic isolation tube, and the main shaft of the high-speed solenoid valve respectively; (2) Fine adjustment of internal components: Fine-tune the positions of the internal components on the end faces of the valve seat, the magnetic isolation tube, and the main shaft respectively and fasten them, thereby forming a valve seat assembly, a magnetic isolation tube assembly, and a main shaft assembly; (3) Outer body adjustment: The internal gap between the valve seat assembly and the magnetic isolation tube assembly forms a first internal gap, and the internal gap between the magnetic isolation tube assembly and the main shaft assembly forms a second internal gap; Use a servo displacement control system with the first internal gap and the second internal gap as the adjustment target parameters to adjust the relative positions of the outer bodies of the valve seat assembly, the magnetic isolation tube assembly, and the main shaft assembly; (4) Synchronous welding: After adjusting the relative positions of the valve seat assembly, the magnetic isolation tube assembly, and the main shaft assembly, the valve seat assembly and the magnetic isolation tube assembly form a first joint, and the magnetic isolation tube assembly and the main shaft assembly form a second joint; Synchronously weld the first joint and the second joint; During the outer body adjustment, monitor through a displacement sensor and then control the adjustment head of the servo displacement control system to adjust the positions of the valve seat assembly, the magnetic isolation tube assembly, and the main shaft assembly until the adjustment is in place; When performing the synchronous welding, use a fiber laser welding system; The fiber laser welding system uses the same laser pulse source, and then uses a beam splitter to generate two laser beams to achieve the synchronous welding.

2. The high-speed solenoid valve welding process according to claim 1, wherein: During the outer body adjustment, fix the magnetic isolation tube assembly, and then adjust the positions of the main shaft assembly and the valve seat assembly.

3. The high-speed solenoid valve welding process according to claim 1, characterized in that: During the synchronous welding in step (4), use a rotating platform to perform synchronous rotary welding in the state of tightly pressing the workpiece.

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