Electric ignition head bridge wire welding method

Abstract

The invention discloses an electric ignition head bridge wire welding method which comprises the following steps: arranging an electric ignition head framework, threading a bridge wire through a wire feeder, setting the wire feeding length of the bridge wire, coating the bridge wire with soldering flux through a soldering flux coating device, feeding the bridge wire to a welding machine, setting the ball outlet diameter of a ball mounter, executing ball outlet operation, starting an air draft device, and welding the bridge wire. And the ball is discharged to a bridge wire on a welding machine and then welded, an electric ignition head is obtained, and welding is completed after the cleaning device is used for cleaning, the appearance detection device detects the appearance and the resistance measurement device detects that the resistance is qualified. According to the method, high consistency of electric resistance welding and welding spot fullness of electric soldering iron tin soldering are combined, and the welding spot strength and quality are guaranteed. By implementing semi-automatic production, a solution is provided for large-batch production, and the annual output can reach about 500,000 pieces when a single device is matched with one person for operation at present.

Description

Technical Field

[0001] The invention belongs to the technical field of electric ignition head preparation, and in particular relates to an electric ignition head bridge wire welding method. Background Art

[0002] When the electric ignition head is working, it connects external DC current to the bridge wire, which generates Joule heat in the bridge wire. The Joule heat is transferred to the ignition powder wrapped around the bridge wire. When the ignition powder is heated to the ignition point, it burns and ignites and outputs heat to ignite other main charges. Therefore, the electric ignition head, as the initial ignition element, has a very wide application in the design of pyrotechnics.

[0003] As the most primitive ignition element of electric ignition products, the electric ignition head is mainly composed of two parts: the frame and the pyrotechnic agent. Common electric ignition head frame structures are as follows: Figure 2 As shown. Figure 2 It can be seen from the figure that the electric ignition head skeleton is mainly composed of the foot wire and bridge wire formed by two twisted single-strand copper core wires.

[0004] How to firmly connect the bridge wire to the leg wire? The most commonly used method is electric soldering. This method requires manual control of the distance between the two copper wires, manually placing the nickel-chromium alloy wire at the intersection with the leg wire, and then using an electric soldering iron to solder the intersection of the two. Since nickel-chromium alloy wire is not easy to get tinned, flux must be added during welding. The entire welding process is relatively complicated, and it is easy to have quality problems such as cold welding and false welding. In addition, manual electric soldering iron operators are prone to physical fatigue, resulting in reduced production efficiency. The output of a single shift is usually no more than 400. Therefore, the electric soldering iron welding method has certain problems in terms of quality and efficiency.

[0005] Although resistance welding is widely used in pyrotechnic bridge wire welding, the resistance welding used in the prior art is mostly performed on the end face of the rigid leg wire. Therefore, a process for resistance welding on the side of the flexible leg wire (copper core conductor) is needed to improve production efficiency.

[0006] The patent document with the announcement number CN112033240A discloses an electric ignition head skeleton, which is mainly composed of a bridge wire, a copper clad laminate, an AV wire and a heat shrink tube. The bridge wire is closely attached to a non-copper foil end face of the copper clad laminate, one end of two AV wires are respectively welded to the two copper foil surfaces of the copper clad laminate, and the AV wires are covered with a heat shrink tube. However, the copper clad laminate in the patent is inside the bridge wire, and the bridge wire is connected to the copper clad laminate, and no finishing is required before welding.

[0007] The patent document with the announcement number CN220902324U discloses an electric ignition head welding mold. The utility model relates to the production technology field of automatic welding and forming of pyrotechnic products, and is mainly applicable to the welding mold of the electric ignition head of blasting equipment. However, the mold is used for laser welding, and it takes a certain amount of time to disassemble the mold. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides an electric ignition head bridge wire welding method, which can solve the problem of low production efficiency in the prior art.

[0009] The present invention is achieved through the following technical solutions.

[0010] The present invention provides an electric ignition head bridge wire welding method, which includes a process of completing the electric ignition head bridge wire welding by a welding machine, a ball planting machine, a wire feeding machine, a flux coating device, an exhaust device, a cleaning device, a bridge resistance measuring device and an appearance detection device.

[0011] An electric ignition head bridge wire welding method comprises the following steps:

[0012] S1: Arrange the electric ignition head frame, thread the bridge wire through the wire feeder, and set the wire feeding length of the bridge wire.

[0013] S2: Apply flux to the bridge wire through the flux coating device and send the bridge wire to the welding machine.

[0014] S3: Set the ball diameter of the ball implanter and perform the ball implantation operation.

[0015] S4: Start the exhaust device, and weld the ball after it reaches the bridge wire on the welding machine to obtain an electric ignition head. The welding is completed after the cleaning device cleans it, the appearance inspection device checks the appearance, and the resistance measurement device detects that the resistance is qualified.

[0016] Preferably, the arranging of the electric ignition head skeleton in step S1 is to manually shape the spacing between the foot lines on both sides to 2-5 mm.

[0017] Preferably, when the bridge wire in step S1 is a bridge wire with a diameter of 0.02-0.12 mm, the wire feeding length is 1-4.5 mm.

[0018] Preferably, the bridge wire is a nickel-chromium resistance alloy wire.

[0019] Preferably, the welding machine in step S2 is a resistance welding machine, the welding current is set to 1000-2000A, the pulse width is 50-100ms, and the cylinder pressure is 0.1-0.9MPa.

[0020] Preferably, the ball diameter of the ball implanter in step S3 is 0.3-0.8 mm, and the ball is a solder ball.

[0021] Preferably, the cleaning device in step S4 is an ultrasonic cleaning device, and the electric ignition head obtained by welding is cleaned at 20-50KHz and 1-2Kw for 10-30min.

[0022] Preferably, the cleaning liquid of the cleaning device in step S4 is anhydrous ethanol.

[0023] Preferably, in step S4, the appearance inspection device detects that the solder joint is full and free of wiredrawing, which is considered qualified.

[0024] The beneficial effects of the present invention are:

[0025] The method of the present invention combines the high consistency of resistance welding with the fullness of solder joints produced by electric soldering iron, thus ensuring the strength and quality of solder joints. By implementing semi-automatic production, a solution is provided for mass production. Currently, the annual output of a single device with one operator can reach about 500,000 pieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a process flow chart of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the bridge wire of the electric ignition head;

[0028] In the figure: 1-skeleton, 2-bridge wire, 3-foot wire. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0030] The welding machine can output a maximum pulsed direct current of 2000A, and the current size and pulse width time are adjustable. The welding machine is a resistance welding machine, the upper electrode of the welding machine is a movable type, the lower electrode is a fixed type structure, and the bonding force between the upper and lower electrodes is adjustable.

[0031] The wire feeder can continuously transmit the bridge wire 2 with an outer diameter of 0.02 mm without breaking, and the wire feeding length can be automatically adjusted.

[0032] The soldering flux coating device can automatically coat the soldering flux at a designated position, and the amount of the coated soldering flux is adjustable.

[0033] The exhaust device can absorb and purify the smoke generated during the welding process.

[0034] The cleaning device can clean the soldering flux on the bridge wire of the electric ignition head.

[0035] The bridge resistance measuring device can measure the bridge resistance after welding.

[0036] The appearance detection device can automatically detect the appearance quality of the welding point.

[0037] Embodiment 1:

[0038] like Figure 1-2 As shown, a method for welding an electric ignition head bridge wire includes completing the process of welding the electric ignition head bridge wire through a welding machine, a ball planting machine, a wire feeding machine, a flux coating device, an exhaust device, a cleaning device, a bridge resistance measuring device and an appearance detection device.

[0039] An electric ignition head bridge wire welding method comprises the following steps:

[0040] S1: Arrange the electric ignition head frame 1, feed the bridge wire 2 through the wire feeder, and set the wire feeding length of the bridge wire 2.

[0041] S2: Apply flux to bridge wire 2 through a flux coating device, and send bridge wire 2 to a welding machine.

[0042] S3: Set the ball diameter of the ball implanter and perform the ball implantation operation.

[0043] S4: Start the exhaust device until there is no welding smoke and odor in the machine, and weld the ball after it reaches the bridge wire 2 on the welding machine to obtain an electric ignition head. The welding is completed after the cleaning device cleans it, the appearance inspection device checks the appearance, and the resistance measurement device detects that the resistance is qualified.

[0044] The arranging of the electric ignition head frame 1 in step S1 is to manually shape the spacing of the two side leg wires 3 to 3mm. The station for manually arranging the electric ignition head frame 1 is only responsible for placing the frame on the specified tooling after shaping, with low labor intensity, and the efficiency of manual calibration of the frame reaches 400 per hour.

[0045] When the bridge wire 2 in step S1 is a bridge wire 2 with a diameter of 0.02 mm, the wire feeding length is 2 mm. The bridge wire 2 is a nickel-chromium resistance alloy wire.

[0046] The welding machine in step S2 is a resistance welding machine, the welding current is set to 1200A, the pulse width is 80ms, and the cylinder pressure is 0.4MPa. The soldering flux is 880S soldering flux from Shenzhen Heming Technology Co., Ltd., and 0.1ml of the soldering flux is automatically applied to the solder joint each time.

[0047] The ball diameter of the ball implanter in step S3 is 0.45 mm, and the ball is a solder ball.

[0048] The cleaning device in step S4 is an ultrasonic cleaning device, which can clean 500 ignition head skeletons 1 per hour. The welded ignition heads are cleaned at 40KHz and 1.5Kw for 20 minutes.

[0049] The cleaning liquid of the cleaning device in step S4 is anhydrous ethanol.

[0050] In step S4, the bridge resistance measuring device measures the bridge resistance to be 4.9-5.8Ω, and the appearance inspection device detects that the solder joint is full and free of wire drawing, which is qualified.

[0051] By using the above method to produce DH-05 electric ignition head skeletons, the output can reach 1,800 pieces per working day.

[0052] Embodiment 2:

[0053] like Figure 1-2 As shown, a method for welding an electric ignition head bridge wire includes completing the process of welding the electric ignition head bridge wire through a welding machine, a ball planting machine, a wire feeding machine, a flux coating device, an exhaust device, a cleaning device, a bridge resistance measuring device and an appearance detection device.

[0054] An electric ignition head bridge wire welding method comprises the following steps:

[0055] S1: Arrange the electric ignition head frame 1, feed the bridge wire 2 through the wire feeder, and set the wire feeding length of the bridge wire 2.

[0056] S2: Apply flux to bridge wire 2 through a flux coating device, and send bridge wire 2 to a welding machine.

[0057] S3: Set the ball diameter of the ball implanter and perform the ball implantation operation.

[0058] S4: Start the exhaust device until there is no welding smoke and odor in the machine, and weld the ball after it reaches the bridge wire 2 on the welding machine to obtain an electric ignition head. The welding is completed after the cleaning device cleans it, the appearance inspection device checks the appearance, and the resistance measurement device detects that the resistance is qualified.

[0059] The arranging of the electric ignition head frame 1 in step S1 is to manually shape the spacing of the two side leg wires 3 to 3mm. The station for manually arranging the electric ignition head frame 1 is only responsible for placing the frame on the specified tooling after shaping, with low labor intensity, and the efficiency of manual calibration of the frame reaches 400 per hour.

[0060] When the bridge wire 2 in step S1 is a bridge wire 2 with a diameter of 0.08 mm, the wire feeding length is 4.5 mm. The bridge wire 2 is a nickel-chromium resistance alloy wire.

[0061] The welding machine in step S2 is a resistance welding machine, the welding current is set to 1850A, the pulse width is 100ms, and the cylinder pressure is 0.65MPa. The soldering flux is 880S soldering flux from Shenzhen Heming Technology Co., Ltd., and 0.2ml of the soldering flux is automatically applied to the solder joint each time.

[0062] The ball diameter of the ball implanter in step S3 is 0.7 mm, and the ball is a solder ball.

[0063] The cleaning device in step S4 is an ultrasonic cleaning device, which can clean 800 ignition head skeletons 1 per hour. The welded ignition heads are cleaned at 20KHz and 1Kw for 10 minutes.

[0064] The cleaning liquid of the cleaning device in step S4 is anhydrous ethanol.

[0065] In step S4, the bridge resistance measuring device measures the bridge resistance to be 0.6-1.0Ω, and the appearance inspection device detects that the solder joint is full and free of wire drawing, which is qualified.

[0066] By using the above method to produce DH-06 electric ignition head skeletons, the output per working day can reach 2,700 pieces.

[0067] Embodiment 3:

[0068] like Figure 1-2 As shown, a method for welding an electric ignition head bridge wire includes completing the process of welding the electric ignition head bridge wire through a welding machine, a ball planting machine, a wire feeding machine, a flux coating device, an exhaust device, a cleaning device, a bridge resistance measuring device and an appearance detection device.

[0069] An electric ignition head bridge wire welding method comprises the following steps:

[0070] S1: Arrange the electric ignition head frame 1, feed the bridge wire 2 through the wire feeder, and set the wire feeding length of the bridge wire 2.

[0071] S2: Apply flux to bridge wire 2 through a flux coating device, and send bridge wire 2 to a welding machine.

[0072] S3: Set the ball diameter of the ball implanter and perform the ball implantation operation.

[0073] S4: Start the exhaust device until there is no welding smoke and odor in the machine, and weld the ball after it reaches the bridge wire 2 on the welding machine to obtain an electric ignition head. The welding is completed after the cleaning device cleans it, the appearance inspection device checks the appearance, and the resistance measurement device detects that the resistance is qualified.

[0074] The arranging of the electric ignition head frame 1 in step S1 is to manually shape the spacing of the two side leg wires 3 to 5mm. The station for manually arranging the electric ignition head frame 1 is only responsible for placing the frame on the specified tooling after shaping, with low labor intensity, and the efficiency of manual calibration of the frame reaches 400 per hour.

[0075] When the bridge wire 2 in step S1 is a bridge wire 2 with a diameter of 0.035 mm, the wire feeding length is 3 mm. The bridge wire 2 is a nickel-chromium resistance alloy wire.

[0076] The welding machine in step S2 is a resistance welding machine, the welding current is set to 1450A, the pulse width is 90ms, and the cylinder pressure is 0.5MPa. The soldering flux is 880S soldering flux from Shenzhen Heming Technology Co., Ltd., and 0.15ml of the soldering flux is automatically applied to the solder joint each time.

[0077] The ball diameter of the ball implanter in step S3 is 0.55 mm, and the ball is a solder ball.

[0078] The cleaning device in step S4 is an ultrasonic cleaning device, which can clean 600 ignition head skeletons 1 per hour. The welded ignition heads are cleaned at 50KHz and 2Kw for 30 minutes.

[0079] The cleaning liquid of the cleaning device in step S4 is anhydrous ethanol.

[0080] In step S4, the bridge resistance measuring device measures the bridge resistance to be 2.5-3.6Ω, and the appearance inspection device detects that the solder joint is full and free of wire drawing, which is qualified.

[0081] By using the above method to produce DH-04 electric ignition head skeletons, the output can reach 2,300 pieces per working day.

Claims

1. A bridge wire welding method with an electric ignition head, characterized in that: The invention comprises a process of completing the welding of the bridge wire of the electric ignition head by means of a welding machine, a ball planting machine, a wire feeding machine, a flux coating device, an exhaust device, a cleaning device, a bridge resistance measuring device and an appearance detection device.

2. An electric ignition head bridge wire welding method, characterized in that: The following steps are involved: S1: Arrange the electric ignition head frame (1), thread the bridge wire (2) through the wire feeder, and set the wire feeding length of the bridge wire (2); S2: applying flux to the bridge wire (2) by a flux coating device, and sending the bridge wire (2) to a welding machine; S3: Set the ball output diameter of the ball implanter and perform the ball output operation; S4: Start the exhaust device, and weld the ball after it reaches the bridge wire (2) on the welding machine to obtain an electric ignition head. After the cleaning device cleans it, the appearance inspection device checks the appearance, and the resistance measurement device checks the resistance, the welding is completed.

3. An electric ignition bridge wire welding method as claimed in claim 2, characterized in that: The arranging of the electric ignition head frame (1) in the step S1 is to manually shape the spacing between the leg lines (3) on both sides to 2-5 mm.

4. The electric ignition head bridge wire welding method according to claim 2, characterized in that: When the bridge wire (2) in step S1 is a bridge wire (2) with a diameter of 0.02-0.12 mm, the wire feeding length is 1-4.5 mm.

5. The electric ignition head bridge wire welding method according to claim 4, characterized in that: The bridge wire (2) is a nickel-chromium resistance alloy wire.

6. The electric ignition bridge wire welding method according to claim 2, characterized in that: The welding machine in step S2 is a resistance welding machine, the welding current is set to 1000-2000A, the pulse width is 50-100ms, and the cylinder pressure is 0.1-0.9MPa.

7. The electric ignition bridge wire welding method according to claim 2, characterized in that: The ball diameter of the ball implanter in step S3 is 0.3-0.8 mm, and the ball is a solder ball.

8. The electric ignition head bridge wire welding method according to claim 2, characterized in that: The cleaning device in step S4 is an ultrasonic cleaning device, and the electric ignition head obtained by welding is cleaned at 20-50KHz and 1-2Kw for 10-30min.

9. The electric ignition bridge wire welding method according to claim 2, characterized in that: The cleaning liquid of the cleaning device in step S4 is anhydrous ethanol.

10. The electric ignition head bridge wire welding method according to claim 2, characterized in that: In step S4, the appearance inspection device detects that the solder joint is full and free of wire drawing, which means it is qualified.

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