Brazing Ring Hot Forming Machine

Abstract

The present invention provides a brazing ring hot forming machine. A heating control mechanism is fixed on a workbench. The heating control mechanism includes a forming core base and a brazing ring forming core mounted on the forming core base. A heating rod and a temperature sensor are installed inside the brazing ring forming core. The heating rod and the temperature sensor are electrically connected to a temperature control box through a circuit, and a slip ring is installed in the circuit. The present invention designs a device capable of manufacturing a hard and brittle brazing ring, which can manufacture brazing rings of any shape, has high production efficiency, high product qualification rate, high automation degree, reduces the labor intensity of operators, and saves production costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of brazing ring processing, and particularly relates to a hot forming machine for brazing rings. Background Art

[0002] Brazing refers to a welding method in which a brazing filler metal with a melting point lower than that of the workpiece and the workpiece are simultaneously heated to the melting temperature of the brazing filler metal, and then the liquid brazing filler metal is used to fill the gaps between the solid workpieces to connect the metals.

[0003] When high-efficiency brazing is carried out on radiator components by means of induction heating or the like, it is necessary to fabricate brazing rings of specific dimensions according to the shapes of the component welds; the shapes and dimensions of the welds are diverse; for brazing materials such as copper-phosphorus brazing filler metals, due to the relatively high hardness and brittleness of the materials themselves and the easy breakage during cold bending, the yield rate of manual cold bending processing is very low, resulting in an increase in material costs. Summary of the Invention

[0004] To solve the above problems, the present invention provides a hot forming machine for brazing rings, which can process and fabricate hard and brittle brazing rings of any shape and improve efficiency.

[0005] The technical solution adopted by the present invention is: a hot forming machine for brazing rings, on which a heating control mechanism is fixed. The heating control mechanism includes a forming core base and a brazing ring forming core installed on the forming core base. A heating rod and a temperature sensor are installed inside the brazing ring forming core. The heating rod and the temperature sensor are electrically connected to a temperature control box through a circuit, and a slip ring is installed in the circuit.

[0006] Further optimization: an automatic wire winding mechanism is fixed on the workbench. The automatic wire winding mechanism includes a wire feeding mechanism and a wire winding mechanism, which improves the manual wire winding work and further improves the efficiency and optimizes the wire winding stability.

[0007] Further optimization: the wire feeding mechanism includes a brazing wire tray, a tray shaft, a friction disc, a thrust bearing, a friction plate and a friction plate fixing seat. The tray shaft is welded to the brazing wire tray, and a friction disc is installed at the bottom. The friction disc and the tray shaft are locked by a friction disc locking screw. A thrust bearing is installed at the bottom of the friction disc. The tray shaft passes through the workbench, and a friction plate and a friction plate fixing seat are installed outside the friction disc. The friction plate fixing seat is fixed on the workbench.

[0008] Further optimization: the wire winding mechanism includes a wire winding position control mechanism and a wire winding speed control mechanism;

[0009] The wire winding position control mechanism includes a slide table motor, a slide table slider, a slide table base, a filler wire position fixing block, and a slide table motor control cabinet. The slide table base is fixedly installed on the workbench, located between the wire feeding mechanism and the heating control mechanism. The upper part of the slide table base is connected to the slide table slider, the filler wire position fixing block is installed on the slide table slider, the slide table motor is installed on the upper part of the slide table slider, the slide table motor is connected to the slide table motor control cabinet, and the slide table motor control cabinet sets the stepping distance of the slider.

[0010] The wire winding speed control mechanism includes a connecting shaft, an electric slip ring, a speed regulating motor, a reducer, and a speed regulating motor control cabinet. One end of the connecting shaft is connected to the forming core base, and the other end is connected to the shaft of the speed regulating motor. The speed regulating motor is installed on the workbench. The rotor of the electric slip ring rotates with the connecting shaft and is driven by the speed regulating motor. The stator is fixed on the workbench by the electric slip ring locking screw. The speed regulating motor and the reducer drive the connecting shaft to drive the heating control mechanism to wind the wire. The speed regulating motor is controlled by the speed regulating motor control cabinet. The wire winding method is optimized. The stepping distance of the slider can be set through the slide table motor control cabinet according to the diameter of the filler wire, and the wire winding speed can be pre-adjusted according to the material characteristics of the filler wire to achieve the best wire winding effect, improving the production efficiency and the qualified rate of the filler wire ring.

[0011] For further optimization, both sides of the friction plate are provided with guide pins, a spring fixing rod is arranged in the middle, a spring and a nut are installed on the spring fixing rod, and the compression of the spring is adjusted by tightening or loosening the nut, so as to adjust the friction force formed between the friction disc and the friction plate, playing a role in tightening the filler wire.

[0012] For further optimization, a limit switch is installed on the slide table slider, so that the stop position of the wire winding and the stop of heating can be automatically controlled simultaneously.

[0013] For further optimization, a filler wire fixing hole is processed at the bottom of the filler wire ring forming core, a nut is welded at the position corresponding to the filler wire fixing hole on the forming core base, a bolt is installed on the nut as a top screw, and a filler wire ring shearing groove penetrating from top to bottom is opened near the filler wire fixing hole on the filler wire ring forming core.

[0014] For further optimization, there are at least 2 heating rods, symmetrically distributed inside the filler wire ring forming core. The temperature sensor is set at the geometric center of the filler wire ring forming core. The heating temperature is set according to the material of the filler wire ring, within the range higher than the softening temperature of the material and not exceeding the solidus temperature, and the lower value in the range is selected.

[0015] For further optimization, the shape of the filler wire ring forming core is processed according to the shape of the filler wire ring required by the design. The shape of the filler wire ring forming core is a quadrilateral, a circle, a special-shaped polygon with chamfers, etc., meeting the requirements of different working conditions.

[0016] For further optimization, a cooling mechanism is also included. The cooling mechanism is an air cooling device arranged near the filler wire ring forming core, accelerating the cooling and fixing speed.

[0017] The beneficial effects of the present invention are as follows: The present invention designs a device capable of manufacturing a hard and brittle solder ring, which can manufacture solder rings of any shape, has high production efficiency, high product qualification rate, high automation degree, reduces the labor intensity of operators, and saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a solder ring hot forming machine;

[0019] Figure 2 It is a schematic structural diagram of a wire feeding mechanism;

[0020] Figure 3 It is a schematic structural diagram of a wire winding position control mechanism;

[0021] Figure 4 It is a schematic structural diagram of a wire winding speed control mechanism and a heating control mechanism;

[0022] Figure 5 It is a schematic structural diagram of a solder ring forming core;

[0023] Figure 6 It is a schematic structural diagram of a rectangular solder ring forming core;

[0024] Figure 7 It is a schematic structural diagram of a circular solder ring forming core.

[0025] Reference numerals: 1 - Workbench 2 - Wire feeding mechanism 3 - Wire winding position control mechanism 4 - Wire winding speed control mechanism 5 - Heating control mechanism 6 - Thrust bearing 7 - Friction disc 8 - Friction disc locking screw 9 - Tray shaft 10 - Solder wire tray 11 - Spring fixing rod 12 - Guide pin 13 - Spring 14 - Nut 15 - Friction plate 16 - Friction plate fixing seat 17 - Slide base 18 - Slide block 19 - Solder wire position fixing block 20 - Limit switch 21 - Slide motor 22 - Slide motor control cabinet 23 - Speed regulating motor 24 - Reducer 25 - Connecting shaft 26 - Electric slip ring 27 - Forming core base 28 - Solder ring forming core 29 - Heating rod 30 - Temperature sensor 31 - Temperature control box 32 - Electric slip ring locking screw 33 - Speed regulating motor control cabinet 34 - Solder ring cutting opening 35 - Set screw 36 - Solder wire fixing hole DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention is a solder ring hot forming machine, which can manufacture the shape of the corresponding solder ring forming core 28 according to the shape of the solder ring required in each industry field to meet the requirements. In this embodiment, the solder ring used for radiator soldering is taken as an example for specific description. The technical solution of the present invention will be further specifically described below with reference to the drawings.

[0027] like Figure 1 As shown, the present invention is a solder ring thermoforming machine, which consists of a workbench 1, a wire unwinding mechanism 2, a wire winding position control mechanism 3, a heating control mechanism 5, and a wire winding speed control mechanism 4. The workbench 1 is a steel structure welded from section steel and has holes for mounting various mechanisms.

[0028] like Figure 4 As shown, a heating control mechanism 5 is fixed to the workbench 1. The heating control mechanism 5 comprises a forming core base 27 and a brazing ring forming core 28 mounted on the forming core base 27. The brazing ring forming core 28 houses a heating rod 29 and a temperature sensor 30. The heating rod 29 and the temperature sensor 30 are connected to a temperature control box 31 via an electrical circuit. An electrical slip ring 26 is installed in the circuit to connect the circuitry of the temperature sensor 30 and the heating rod 29 to the temperature control box 31. Otherwise, when the speed regulating motor 23 rotates, the wires in the circuitry could become tangled or broken. The temperature control box 31 is equipped with a temperature controller, a switch, an indicator light, and an external power supply. The temperature controller can set the heating temperature and display the current temperature. Based on signals from the temperature sensor 30, the temperature controller controls the operation or deactivation of the heating rod 29, i.e., heating or stopping. The switch has three positions: stop, manual, and automatic. In the automatic mode, the temperature controller automatically controls the heating. In the manual mode, the temperature controller continues to display the heating temperature but does not control the temperature, requiring manual control. The indicator lights include a running indicator light and a stop indicator light, which display the current working status of the equipment.

[0029] like Figure 5 As shown, the solder ring forming core 28 and the forming core base 27 are connected by screws, and the four corners of the forming core base 27 are processed with mounting holes for installation on a workbench. Several mounting holes are processed on the solder ring forming core 28 and the forming core base 27 for installing the temperature sensor 30 and the heating rod 29. The heating rod 29 is a product of the same manufacturer with the same specifications, models and parameters. The parallel circuit used in the wiring has the same voltage and current, and the heating power is basically the same. The positions of the heating rods 29 are symmetrically distributed inside the solder ring forming core and are evenly spaced. The number of heating rods 29 mainly depends on the time of the heating process, so Figure 5For example, in the figure, the 4 double circles are the screw mounting holes for the filler metal ring forming core 28 and the forming core base 27. The single holes in the middle row are 7 circular holes. The 4th hole in the very middle is the hole for installing the temperature sensor 30, and the remaining 6 holes (3 on each side) are the holes for installing the heating rods 29. The temperature sensor 30 is set at the geometric center of the filler metal ring forming core 28, where the temperature is slightly higher than that of the outer surface. This can effectively control the surface temperature of the filler metal ring forming core 28 not to exceed the displayed temperature. Since the filler metal ring forming core 28 is made of carbon steel material with good thermal conductivity, the difference between the surface temperature and the internal temperature is not large, generally not exceeding 1°C. Six heating rods 29 are arranged inside the filler metal ring forming core 28. After starting, it can reach the set 370°C from room temperature in about 20 minutes, which can meet the needs of the process. When the temperature reaches the set temperature, the temperature control box 31 controls the start or stop of the heating rods 29 according to the signal transmitted back by the temperature sensor 30 through its internal circuit, so as to control the heating temperature. The control accuracy of the temperature control box 31 is within ±1°C, which can meet the temperature control requirements for the heating and forming of the filler metal ring. The temperature range that the equipment of the present invention can reach is from room temperature to 500°C. The temperature range is determined according to the softening temperature and solidus temperature of the material. Generally, it is controlled to reach the softening temperature of the material and not exceed the solidus temperature, and as low a temperature as possible is selected to avoid material oxidation and internal lattice damage. Taking copper-based filler metals such as filler metal grades BCu80AgP, BCu93P, and BCu92AgP as examples, the solidus temperature is in the range of 640 - 710°C, and the softening temperature is lower than 370°C. Therefore, the heating and forming temperature is selected as 370°C to achieve a better forming effect.

[0030] As Figure 5 shown, at the bottom of the filler metal ring forming core 28, filler metal wire fixing holes 36 are machined for fixing the ends of the filler metal wires; at the position on the forming core base 27 corresponding to the filler metal wire fixing holes 36 at the bottom of the filler metal ring forming core 28, nuts are welded, and bolts are installed on the nuts as set screws 35. The set screws 35 are designed at the position directly opposite to the filler metal wire fixing holes 36 for clamping and fixing the filler metal wires; on the filler metal ring forming core 28, near the filler metal wire fixing holes 36, there is a filler metal ring cutting notch 34, which is a through-long groove for cutting the filler metal ring into a ring. When winding clockwise, the filler metal ring cutting notch 34 must be on the left side of the filler metal wire fixing hole 36, so as to ensure that the opening size at the cut of the filler metal ring is as small as possible, and the opening size is generally controlled within 1 mm; during brazing, when the opening at the cut of the filler metal ring ≥ 3 mm, the phenomenon of weld breakage (no filler metal at the cut) has occurred. On the contrary, when winding counterclockwise, the filler metal ring cutting notch 34 must be on the right side of the filler metal wire fixing hole 36.

[0031] As Figure 2As shown, a wire unwinding mechanism 2 is fixed on the workbench 1, and the wire unwinding mechanism 2 includes a solder wire tray 10, a tray shaft 9, a friction disc 7, a thrust bearing 6, a friction plate 15 and a friction plate fixing seat 16. The solder wire tray 10 is used to hold bundles of solder wire and fix them on the solder wire tray 10. The tray shaft 9 is welded to the solder wire tray 10, and a friction disc 7 is installed at the bottom. The friction disc 7 and the tray shaft 9 are locked by the friction disc locking screw 8. A thrust bearing 6 is installed at the bottom of the friction disc 7. The tray shaft 9 is passed through the workbench 1, and a friction plate 15 and a friction plate fixing seat 16 are installed on the outside of the friction disc 7. The friction plate fixing seat 16 is fixed on the workbench 1. The friction plate 15 has guide pins 12 on both sides and a spring fixing rod 11 in the middle. The spring fixing rod 11 is equipped with a spring 13 and a nut 14. The compression of the spring 13 is adjusted by tightening or loosening the nut 14, thereby adjusting the friction force formed between the friction disc 7 and the friction plate 15, which plays the role of tightening the solder wire and ensuring that the solder wire can fit on the solder wire forming core 28.

[0032] like Figure 3 As shown, the wire winding position control mechanism 3 includes a slide motor 21, a slide block 18, a slide base 17, a solder wire position fixing block 19, and a slide motor control cabinet 22. The slide base 17 is fixedly installed on the workbench 1 and is located between the wire unwinding mechanism 2 and the heating control mechanism 5. The upper part of the slide base 17 is connected to the slide block 18. The solder wire position fixing block 19 is installed on the slide block 18. The slide block 18 is installed with a limit switch 20. The upper part of the slide block 18 is installed with a slide motor 21. The slide motor 21 is connected to the slide motor control cabinet 22. The slide motor control cabinet 22 sets the slider step distance according to the solder wire diameter. The wire winding speed control mechanism 4 gives a step signal for each winding (rotation) cycle, and the slide motor 21 starts, driving the slide block 18 and the solder wire position fixing block 19 to move a displacement of one solder wire diameter. When the solder wire is wound to the top and touches the limit switch 20, heating and winding are stopped at the same time.

[0033] like Figure 4As shown in the figure, the wire winding speed control mechanism 4 includes a connecting shaft 25, a slip ring 26, a speed regulating motor 23, a speed reducer 24, and a speed regulating motor control cabinet 33. One end of the connecting shaft 25 is connected to the forming core base 27, and the other end is connected to the speed regulating motor shaft. The speed regulating motor 23 is installed on the workbench 1. The rotor of the slip ring 26 rotates with the connecting shaft 25 driven by the speed regulating motor 23, and the stator is fixed on the workbench 1 by a slip ring locking screw 32. The speed regulating motor 23 and the speed reducer 24 drive the connecting shaft 25 to drive the heating control mechanism 5 to wind the wire, and the speed regulating motor 23 is controlled by the speed regulating motor control cabinet 33. The function of the slip ring 26 is to connect the circuits of each heating rod 29 and temperature sensor 30 installed on the solder ring forming core 28 to prevent wire winding during wire winding. The wire harnesses of the heating rods 29 and temperature sensors 30 on the solder ring forming core 28 are connected to the wire harness on the rotor of the slip ring 26, and the wire harness on the stator of the slip ring 26 is connected to the temperature control box 31. According to the material characteristics of the solder, the wire winding speed is pre-adjusted to achieve the best wire winding effect, improving the production efficiency and yield of the solder ring.

[0034] As Figure 6 and Figure 7 shown in the figure, two other shapes of solder ring forming cores 28 are provided, one is rectangular and the other is circular. The shape of the solder ring forming core 28 is processed according to the shape of the solder ring required by the design. The shape of the solder ring forming core is quadrilateral, circular, irregular polygon with chamfers, etc., to meet the requirements of different working conditions.

[0035] A cooling mechanism can also be added to the device. The cooling mechanism is an air cooling device arranged near the solder ring forming core 28, which is used to accelerate the cooling and fixing speed.

[0036] When in use, place the entire plate of solder wire on the solder wire tray 10 of the wire unwinding mechanism 2 and fix it. Pass one end of the solder wire through the center hole of the solder wire position fixing block 19 on the slide block 18 of the wire winding position control mechanism 3 and fix it on the solder ring forming core 28 of the heating control mechanism 5. Insert the end of the solder wire into the solder wire fixing hole 36 and press the solder wire with the top wire 35. Press the friction plate 15 of the wire unwinding mechanism 2. Set the heating temperature to 370°C (taking the solder wire of the solder grade BCu80AgP as an example), the winding speed to 3r / min (the speed is relatively low in order to allow the solder wire temperature to rise to the softening temperature. Otherwise, the temperature is not high enough and the solder wire is easy to break or does not fit well with the solder ring forming core). The winding step distance is set according to the diameter of the solder wire. After the setting is completed, press the start button of the heating control mechanism 4. When the heating temperature reaches the set temperature of 370°C, press the start switch of the speed regulating motor 23 to start the wire winding. At the same time, press the start button of the slide motor 21 of the wire winding position control mechanism 3. The slide motor 21 starts according to the signal from the angle sensor on the speed regulating motor 23. Every time the wire winding speed control mechanism 4 rotates one circle, the slide motor 21 starts, driving the slide block 18 and the solder wire position fixing block 19 to move one solder wire diameter. When the solder wire is completely wound around the solder ring forming core 28, or when the solder wire reaches the top and touches the limit switch 20, heating and winding are stopped simultaneously. After the solder ring cools, cut it one by one with wire cutters to complete the production of the solder ring.

Claims

1. A brazing ring hot forming machine, characterized in that: A heating control mechanism is fixed on the workbench. The heating control mechanism includes a forming core base and a solder ring forming core installed on the forming core base. A heating rod and a temperature sensor are installed inside the solder ring forming core. The heating rod and the temperature sensor are electrically connected to a temperature control box through a circuit. A slip ring is installed in the circuit. An automatic wire winding mechanism is fixed on the workbench. The automatic wire winding mechanism includes a wire feeding mechanism and a wire winding mechanism. The wire winding mechanism includes a wire winding position control mechanism and a wire winding speed control mechanism; The wire feeding mechanism includes a solder wire tray, a tray shaft, a friction disc, a thrust bearing, a friction plate and a friction plate fixing seat. The tray shaft is welded to the solder wire tray and a friction disc is installed at the bottom. The friction disc and the tray shaft are locked by a friction disc locking screw. A thrust bearing is installed at the bottom of the friction disc. The tray shaft passes through the workbench. A friction plate and a friction plate fixing seat are installed outside the friction disc. The friction plate fixing seat is fixed on the workbench; The wire winding position control mechanism includes a slide table motor, a slide table slider, a slide table base, a solder wire position fixing block and a slide table motor control cabinet. The slide table base is fixedly installed on the workbench, between the wire feeding mechanism and the heating control mechanism. The upper part of the slide table base is connected to the slide table slider. The solder wire position fixing block is installed on the slide table slider. The slide table motor is installed on the upper part of the slide table slider. The slide table motor is connected to the slide table motor control cabinet. The slide table motor control cabinet sets the step distance of the slider; The wire winding speed control mechanism includes a connecting shaft, a slip ring, a speed regulating motor, a reducer and a speed regulating motor control cabinet. One end of the connecting shaft is connected to the forming core base and the other end is connected to the speed regulating motor shaft. The speed regulating motor is installed on the workbench. The rotor of the slip ring rotates with the connecting shaft and is driven by the speed regulating motor. The stator is fixed on the workbench by a slip ring locking screw. The speed regulating motor and the reducer drive the connecting shaft to drive the heating control mechanism to rotate and wind the wire. The speed regulating motor is controlled by the speed regulating motor control cabinet.

2. The brazing ring hot forming machine according to claim 1, characterized in that: Both sides of the friction plate are provided with guide pins and a spring fixing rod is arranged in the middle. A spring and a nut are installed on the spring fixing rod.

3. The brazing ring hot forming machine according to claim 1, characterized in that: A limit switch is installed on the slide table slider.

4. The solder ring thermoforming machine according to any one of claims 1 to 3, characterized in that: A solder wire fixing hole is machined at the bottom of the solder ring forming core. A nut is welded at the position corresponding to the solder wire fixing hole on the forming core base. A bolt is installed on the nut as a set screw. On the solder ring forming core, near the solder wire fixing hole, a solder ring cutting notch is opened which penetrates from top to bottom.

5. The brazing ring hot forming machine according to any one of claims 1 to 3, characterized in that: The shape of the solder ring forming core is machined according to the shape of the solder ring required by the design. The shape of the solder ring forming core is a quadrilateral, a circle or a special-shaped polygon with chamfers.

6. The brazing ring hot forming machine according to any one of claims 1 to 3, characterized in that: It also includes a cooling mechanism. The cooling mechanism is an air cooling device arranged near the solder ring forming core.

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