Insulation padding for electromagnetic pulse welding and flying plate deformation control method

Abstract

The invention discloses an insulating padding for electromagnetic pulse welding and a flying plate deformation control method. Rice particles or bean particles are adopted as the insulating padding. The method comprises the steps that a base plate is placed on a welding workbench of electromagnetic pulse equipment, an insulation padding is placed between the base plate and a flying plate according to the obtained lap joint distance, electromagnetic pulse welding is carried out, and after welding is finished, insulation padding particles between the base plate and the flying plate are cleaned. According to the welding device, the deformation amount of the non-welding part of the end part of the flying plate can be accurately controlled, the welded insulating padding can be smoothly and quickly taken out, and only compressed gas needs to be adopted to purge broken particles of the insulating padding between the base plate and the flying plate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electromagnetic pulse welding, and particularly relates to an insulating pad for electromagnetic pulse welding and a flying plate deformation control method. BACKGROUND

[0002] The core components that determine the collision energy size in the electromagnetic pulse welding process mainly include: a high-voltage capacitor group, an automatic control system, a high-speed switching device, a forming coil, and an insulating pad. Among them, the insulating pad mainly plays the role of controlling the collision gap and the collision speed, and preventing unintended leakage. The collision gap is the distance between the flying plate and the base plate, which determines whether the speed of the flying plate after the action of the electromagnetic force can reach the required impact speed for welding. Therefore, the selection of a suitable insulating pad is crucial for electromagnetic pulse welding.

[0003] At present, the insulating pad used for plate electromagnetic pulse welding is mainly a resin pad, and the types of insulating pads that can be selected include inclined angle pads, arc-shaped pads, and right-angle pads. Although the existing insulating pads can ensure the welding stability and safety to a certain extent, they are difficult to accurately control the deformation amount (warping angle) of the non-welding part at the end of the flying plate. More importantly, the insulating pad after welding cannot be smoothly and quickly removed, and usually requires a large amount of effort and the use of a power source driven clamp to remove the insulating pad, and also requires the use of a pressing and heating process to flatten the non-welding part at the end of the flying plate, which is very troublesome. SUMMARY

[0004] At least to solve the technical problems mentioned in the background, the present application provides an insulating pad for electromagnetic pulse welding and a flying plate deformation control method, which adopts the following technical solutions.

[0005] An insulating pad for electromagnetic pulse welding, which adopts rice particles or bean particles.

[0006] Preferably, the insulating pad adopts rice particles with a diameter of not greater than 3mm, and the rice particles are laid in a single layer.

[0007] An electromagnetic pulse welding flying plate deformation control method using the aforementioned insulating pad, which includes the following steps: Step 1: Prepare the base plate and flying plate to be welded, and dry them after cleaning. Step 2: Determine the lap spacing and collision gap according to the specifications of the base plate and flying plate used. Step 3: Select an insulating pad with a size consistent with the collision gap. Step 4: Place the base plate on the welding workbench of the electromagnetic pulse equipment, and place the insulating pad between the base plate and the flying plate according to the obtained lap spacing. Step 5, turn on the electromagnetic pulse device, and implement the electromagnetic pulse welding according to the set process parameters; Step 6, after the welding is completed, clean the insulating pad debris between the base plate and the flying plate.

[0008] In step 6, compressed gas is used to blow the insulating pad debris between the base plate and the flying plate.

[0009] Preferably, when the flying plate wall thickness is not greater than 2mm, the insulating pad uses spherical or ellipsoidal rice particles with a diameter of 0.5-1mm; when the flying plate wall thickness is greater than 2mm but not greater than 5mm, the insulating pad uses spherical or ellipsoidal rice particles with a diameter of 1.5-2mm; when the flying plate wall thickness is greater than 5mm, the insulating pad uses spherical or ellipsoidal rice particles with a diameter of 2-3mm; or, when the flying plate wall thickness is greater than 5mm, the insulating pad uses soybean particles.

[0010] Preferably, the moisture content in the insulating pad is 14.5-15.5%.

[0011] Preferably, in step 4, the spacing between adjacent rice particles is 10-20mm.

[0012] Beneficial effects: using the scheme of the present application, not only can the deformation amount (warping angle) of the non-welding part of the flying plate end be accurately controlled, but also the insulating pad after welding can be smoothly and quickly taken out, only compressed gas is needed to blow the insulating pad debris between the base plate and the flying plate, without using the traditional scheme of taking out the insulating pad clamp, and the key is that the key process of "flattening the non-welding part of the flying plate end by means of top pressure and heating process" in the traditional scheme is omitted, and the whole operation process is simpler. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the insulating pad placed between the base plate and the flying plate in the embodiment; Figure 2 It is a schematic view of the insulating pad laying state in the embodiment; Figure 3 It is a schematic view of the insulating pad debris state after electromagnetic pulse welding in the embodiment. DETAILED DESCRIPTION

[0014] The following will be further described in detail through specific embodiments. Embodiment 1

[0015] An electromagnetic pulse welding flying plate deformation control method, the steps include: Step 1: Prepare the substrate 1 and flyer plate 2 to be welded, and clean and dry the substrate 1 and flyer plate 2 for later use; In this embodiment, both the substrate 1 and flyer plate 2 are made of 6061 aluminum alloy, with a wall thickness of 3mm. The length of the substrate 1 and flyer plate 2 is 140mm and the width is 100mm. The welding method is lap joint with an lap length of 35mm. Step 2: Determine the overlap spacing and collision gap according to the specifications of the base plate 1 and the flyboard 2. The collision gap is 2mm. Step 3: Select insulating pad material 3 with the same size as the collision gap; the insulating pad material 3 is made of spherical or ellipsoidal rice grains with a diameter of 2±0.2mm. The rice grains of this size are obtained by pre-drying Wuchang glutinous rice, and the moisture content is controlled at 14.5~15.5%; Step 4: Place substrate 1 on the welding workbench of the electromagnetic pulse equipment, and according to the obtained overlap spacing, place insulating pad 3 between substrate 1 and fly plate 2. The spacing between adjacent rice grains is 15±2mm. This is the state at this point. Figure 1 and Figure 2 As shown; Step 5: Turn on the electromagnetic pulse equipment and perform electromagnetic pulse welding according to the set process parameters (fixed input energy 40kJ); Step 6: After welding, clean the insulating pad material fragments 4 between the substrate 1 and the flyer plate 2. During this process, the spherical or ellipsoidal rice grains are formed into rice fragments (i.e., insulating pad material fragments 4) under the impact of the flyer plate 2. This is the state at this time. Figure 3 As shown. Example 2

[0016] A method for controlling deformation of an electromagnetic pulse welding flyplate, comprising the following steps: Step 1: Prepare the substrate 1 and flyer plate 2 to be welded, and clean and dry the substrate 1 and flyer plate 2 for later use; In this embodiment, both the substrate 1 and flyer plate 2 are made of 6061 aluminum alloy, with a wall thickness of 6mm, a length of 140mm and a width of 100mm, and the welding method is lap joint with an lap length of 35mm. Step 2: Determine the overlap spacing and collision gap according to the specifications of the base plate 1 and the flyboard 2. The collision gap is 3mm. Step 3: Select insulating pad material 3 with the same size as the collision gap; the insulating pad material 3 is made of spherical or ellipsoidal rice grains with a diameter of 3±0.1mm. The rice grains of this size are obtained by screening pearl rice and drying in advance, and the moisture content is controlled at 14.5~15.5%; Step 4: Place substrate 1 on the welding workbench of the electromagnetic pulse equipment, and according to the obtained overlap spacing, place insulating pad 3 between substrate 1 and fly plate 2. The spacing between adjacent rice grains is 13±2mm. At this point...Figure 1 and Figure 2 As shown; Step 5: Turn on the electromagnetic pulse equipment and perform electromagnetic pulse welding according to the set process parameters (fixed input energy 60kJ); Step 6: After welding, clean the insulating pad material fragments 4 between the substrate 1 and the flyer plate 2. During this process, the spherical or ellipsoidal rice grains are formed into rice fragments (i.e., insulating pad material fragments 4) under the impact of the flyer plate 2. This is the state at this time. Figure 3 As shown. Example 3

[0017] A method for controlling deformation of an electromagnetic pulse welding flyplate, comprising the following steps: Step 1: Prepare the substrate 1 and flyer plate 2 to be welded, and clean and dry the substrate 1 and flyer plate 2 for later use; In this embodiment, the substrate 1 and flyer plate 2 are both made of 6061 aluminum alloy, with a wall thickness of 1.5mm, a length of 140mm and a width of 100mm, and the welding method is lap joint with an lap length of 35mm. Step 2: Determine the overlap spacing and collision gap according to the specifications of the base plate 1 and the flyboard 2. The collision gap is 1mm. Step 3: Select insulating pad material 3 with the same size as the collision gap; the insulating pad material 3 is made of spherical or ellipsoidal rice grains with a diameter of 1±0.1mm. The rice grains of this size are obtained by polishing (reducing the size of the rice grains to make it easier to obtain rice grains of the target size), screening pearl rice, and drying, and the moisture content is controlled at 14.5~15.5%; Step 4: Place substrate 1 on the welding workbench of the electromagnetic pulse equipment, and according to the obtained overlap spacing, place insulating pad 3 between substrate 1 and fly plate 2. The spacing between adjacent rice grains is 12±2mm. This is the state at this point. Figure 1 and Figure 2 As shown; Step 5: Turn on the electromagnetic pulse equipment and perform electromagnetic pulse welding according to the set process parameters (fixed input energy 35kJ); Step 6: After welding, clean the insulating pad material fragments 4 between the substrate 1 and the flyer plate 2. During this process, the spherical or ellipsoidal rice grains are formed into rice fragments (i.e., insulating pad material fragments 4) under the impact of the flyer plate 2. This is the state at this time. Figure 3 As shown. Example 4

[0018] A method for controlling deformation of an electromagnetic pulse welding flyplate, comprising the following steps: Step 1: Prepare the substrate 1 and flyer plate 2 to be welded, and clean and dry the substrate 1 and flyer plate 2 for later use; In this embodiment, both the substrate 1 and flyer plate 2 are made of 6061 aluminum alloy, with a wall thickness of 8mm, a length of 150mm and a width of 900mm, and the welding method is lap joint with an lap length of 40mm. Step 2: Determine the overlap spacing and collision gap according to the specifications of the base plate 1 and the flyboard 2. The collision gap is 4.5mm. Step 3: Select insulating pad material 3 with the same size as the collision gap; the insulating pad material 3 is made of soybean granules with a diameter of 4.5±0.1mm. The soybean granules of this size are obtained by screening soybean granules and drying them in advance, and the moisture content is controlled at 14.5~15.5%; Step 4: Place substrate 1 on the welding workbench of the electromagnetic pulse equipment, and according to the obtained overlap spacing, place insulating pad 3 between substrate 1 and fly plate 2. The spacing between adjacent soybean particles is 17±2mm. This is the state at this point. Figure 1 and Figure 2 As shown; Step 5: Turn on the electromagnetic pulse equipment and perform electromagnetic pulse welding according to the set process parameters (fixed input energy 70kJ); Step 6: After welding, clean the insulating pad material fragments 4 between the substrate 1 and the flyer plate 2. During this process, the soybean particles are formed into soybean fragments (i.e., insulating pad material fragments 4) under the impact of the flyer plate 2. This is the state at this time. Figure 3 As shown.

[0019] Compared with Example 1, the difference is that an epoxy resin board with a length of 100mm, a width of 5mm, and a wall thickness of 2mm is used as the insulating pad.

[0020] Compared with Example 1, Example 2 uses an epoxy resin board with a length of 100mm, a width of 5mm, and a wall thickness of 3mm as the insulating pad.

[0021] Compared with Example 1, Example 3 uses an epoxy resin board with a length of 100mm, a width of 5mm, and a wall thickness of 1mm as the insulating pad.

[0022] Compared with Example 1, Example 4 uses an epoxy resin board with a length of 100mm, a width of 5mm, and a wall thickness of 4.5mm as the insulating pad.

[0023] The samples obtained by welding in the examples were tested, and the results were as follows: In Example 1, the deformation (warping angle α) of the non-welded part at the end of the flyplate was 6°; in Example 2, the deformation (warping angle α) of the non-welded part at the end of the flyplate was 7.5°; in Example 3, the deformation (warping angle α) of the non-welded part at the end of the flyplate was 6.3°; and in Example 4, the deformation (warping angle α) of the non-welded part at the end of the flyplate was 6.8°. The welds of the samples obtained in each example all met the mechanical performance requirements. In contrast, in Example 1, the deformation (warping angle α) of the non-welded part at the end of the plate was 21.5°; in Example 2, the deformation (warping angle α) of the non-welded part at the end of the plate was 19.7°; in Example 3, the deformation (warping angle α) of the non-welded part at the end of the plate was 16.1°; and in Example 4, the deformation (warping angle α) of the non-welded part at the end of the plate was 24.9°. As can be seen, the solution in this embodiment of the invention can accurately control the deformation of the non-welded part at the end of the flyboard, and the resulting deformation (warping angle a) of the non-welded part at the end of the flyboard is very small, so there is no need to level the non-welded part at the end of the flyboard after welding.

[0024] Because of the use of the insulating pad material of the specific material in this invention, the insulating pad material between the substrate 1 and the flyboard 2 after electromagnetic pulse welding is formed into fragments. Subsequently, it is only necessary to use compressed gas to blow away these insulating pad material fragments, so that the welded insulating pad material can be removed smoothly and quickly without the need for the clamps used in the traditional solution to remove the insulating pad, which is very convenient.

Claims

1. An insulating pad for electromagnetic pulse welding, characterized in that: The insulating padding material is made of rice grains or bean grains.

2. The insulating pad material according to claim 1, characterized in that: The insulating padding material is made of rice grains with a diameter of no more than 3 mm, and the rice grains are laid in a single layer.

3. A method for controlling the deformation of an electromagnetic pulse welding flyplate using the insulating pad material as described in claim 1 or 2, characterized in that the steps include... include: Step 1: Prepare the substrate (1) and flyboard (2) to be soldered, and clean and dry the substrate (1) and flyboard (2) for later use; Step 2: Determine the overlap spacing and collision gap according to the specifications of the substrate (1) and the flyboard (2) used; Step 3: Select an insulating pad with the same dimensions as the collision gap; Step 4: Place the substrate (1) on the welding workbench of the electromagnetic pulse equipment, and place the insulating pad between the substrate (1) and the flyboard (2) according to the obtained overlap distance; Step 5: Turn on the electromagnetic pulse equipment and perform electromagnetic pulse welding according to the set process parameters; Step 6: After welding, clean up the insulation pad debris between the substrate (1) and the flyboard (2).

4. The electromagnetic pulse welding flyplate deformation control method according to claim 3, characterized in that: In step 6, compressed gas is used to blow away the insulating pad material fragments between the substrate (1) and the flyboard (2).

5. The electromagnetic pulse welding flyplate deformation control method according to claim 4, characterized in that: When the wall thickness of the flyboard (2) is not greater than 2mm, the insulating pad material is made of spherical or ellipsoidal rice grains with a diameter of 0.5~1mm; when the wall thickness of the flyboard (2) is greater than 2mm but not greater than 5mm, the insulating pad material is made of spherical or ellipsoidal rice grains with a diameter of 1.5~2mm; when the wall thickness of the flyboard (2) is greater than 5mm, the insulating pad material is made of spherical or ellipsoidal rice grains with a diameter of 2~3mm, or the insulating pad material is made of soybean grains.

6. The electromagnetic pulse welding flyplate deformation control method according to claim 5, characterized in that: The moisture content of the insulating pad material is 14.5-15.5%.

7. The electromagnetic pulse welding flyplate deformation control method according to claim 6, characterized in that: In step 4, the spacing between adjacent rice grains is 10~20mm.

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