Apparatus and method for producing large size tin balls by predetermined amount co-die bonding process

Abstract

The present application relates to a kind of device and method for preparing large size tin ball by predetermined amount synergistic spheroidization, the device includes wire feed assembly, spheroidization cooling assembly below wire feed assembly, control system;The method is that tin wire is cut off quantitatively after using wire feed assembly, and after complete melting in spheroidization cooling assembly, tin ball with diameter greater than 1.0mm~3.0mm is formed.The present application can control the size of tin ball by wire cutting, and large size tin ball with uniform size and good roundness is produced.The present application can realize the preparation of large size tin ball by the principle that tin liquid is rapidly contracted into ball under the action of surface tension in forming liquid.The tin ball preparation device of the present application is designed ingeniously, easy to operate, and can be flexibly adjusted according to needs, and multiple specifications of large size tin ball are produced with high production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tin ball preparation for welding, and particularly relates to a device for preparing large-size tin balls and a tin ball preparation method thereof. BACKGROUND

[0002] With the development of the new energy automobile industry and the expansion of the intelligent automobile field, large-size tin balls are needed for welding in the process of automobile chip packaging, which brings challenges and opportunities to the traditional preparation method of BGA tin balls. At present, the specifications of BGA tin balls on the market mainly concentrate in the range of 0.1-1.5 mm, and the main preparation process is the droplet jet method. The molten tin after smelting is broken to produce a metal jet under the action of pressure, the flow rate is controlled to keep the jet in a laminar flow state, and the jet is broken into uniform metal droplets under the action of mechanical vibration at a certain frequency. The dispersed droplets fall to the liquid nitrogen cooling and shaping under the action of electrostatic protection. Under the action of liquid nitrogen cooling, the tin ball in the medium is jointly affected by the buoyancy and surface tension of the tin ball, so as to buffer the gravity of the tin ball itself, so as to ensure that the tin ball is cooled and shaped during free fall. The process is simple, the process conditions are easy to control, the size of the obtained tin ball product is uniform, and the precision is high. However, due to the relatively long time of large particle tin droplet spheroidization, and the problem that large-size tin balls are easily crushed under the action of their own gravity, and the excessive increase of the liquid nitrogen cooling space also increases the cost.

[0003] In addition, the conventional preparation method also has an atomization method and a wire cutting remelting method. The atomization method is to break the liquid metal by using the action of centrifugal force, and the formed droplets fall into the cooling medium for solidification, and finally form small particles. The atomization method has high production efficiency, but the size fluctuation range of the product prepared by this method is relatively wide, the yield of finished products is low, and it is not conducive to process expansion production. The wire cutting remelting method is to put the quantitatively treated soldering tin into a heating pipe, and the soldering tin is re-melted, spheroidized and shaped in the heating pipe through the preheating section, the spheroidization section and the cooling section to obtain tin balls. The tin balls are then cleaned and screened to obtain qualified products. The advantage of this method is that different specifications of tin balls can be controllably produced, and the equipment is relatively simple. Many previous studies have shown that the tin balls prepared by this method have good roundness. However, it is only suitable for the production of small-size tin balls. If it is used to produce large-size tin balls, the length of the heating pipe needs to be very long to allow the tin balls to have enough time to spheroidize and cool and shape, and the process control is complex. The dropped tin balls are also prone to deformation, so it is difficult to use this method to prepare large-size tin balls.

[0004] The roundness of the tin ball is an important standard for measuring the quality of the tin ball. Neither the droplet jet method nor the wire cutting remelting method is suitable for the production of large-size tin balls. Therefore, to solve the problems of long melting time, slow spheroidization speed, slow cooling and shaping, and easy deformation of large-size tin balls, and to realize the preparation of large-size tin balls, is an urgent problem to be solved at present. SUMMARY

[0005] In view of the problems in the prior art, the present application aims to provide a device for preparing tin balls by pre-quantitative synergistic spheroidization treatment, which can accurately quantify the size of tin balls and prepare larger size tin balls, and a method for preparing larger size tin balls by the device, thereby providing reliable support for producing more specifications of tin balls.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions.

[0007] A device for preparing large size tin balls by pre-quantitative synergistic spheroidization treatment, comprising a wire cutting feeding assembly, a spheroidization cooling assembly located below the wire cutting feeding assembly, and a control system.

[0008] The wire cutting feeding assembly comprises a base, a wire winding roller mounting rack, a transmission shaft mounting rack, a movable perforated plate, a cutter slide rail horizontally mounted on the front upper part of the perforated plate, a cutter mechanism reciprocally movable along the cutter slide rail, and a fixed shaft mounting rack, which are sequentially arranged from the rear part to the front part of the base; a set of wire winding rollers are sequentially sleeved on the horizontal cross arm of the wire winding roller mounting rack; a movable pressing strip and a transmission shaft located below the pressing strip are horizontally mounted on the transmission shaft mounting rack, and a transmission shaft motor and a pressing strip electric push rod mechanism are also arranged on the transmission shaft mounting rack; tin wire perforations are uniformly arranged on the perforated plate in the horizontal direction; a moving mechanism is arranged on both sides of the base, and the bottom ends of both sides of the perforated plate are mounted on the moving mechanism and can reciprocally move along the longitudinal direction of the base.

[0009] The cutter mechanism comprises a slider block seat fitted on the cutter slide rail and reciprocally movable along the cutter slide rail, a cutting blade fixedly mounted on the slider block seat, and a blade driving motor.

[0010] An upper fixed shaft and a lower fixed shaft adjacently arranged in the vertical direction and adjustable in height are horizontally mounted on the fixed shaft mounting rack, and a fixed shaft controller for controlling the up-and-down action of the upper fixed shaft and the lower fixed shaft is arranged on one side of the base; tin wire inductors are arranged on the perforated plate and the fixed shaft mounting rack, respectively; a set of conveyors corresponding to the tin wire perforations are arranged in front of the perforated plate at intervals on the base, a set of tin wire conveying holes corresponding to the ends of the conveyors are arranged at intervals on the front end of the base, a tin wire conveying pipe connected with the tin wire conveying holes is connected to the bottom surface of the base, and a conveyor controller for controlling the operation of the conveyors is arranged on one side of the base.

[0011] The spheroidization cooling assembly comprises a kettle, an upper cover arranged on the top of the kettle, a kettle heating jacket arranged outside the kettle, a first thermocouple and a tin ball forming plate arranged inside the kettle, a forming tube located below the kettle and communicated with the kettle, a cooling jacket arranged outside the forming tube, a second thermocouple arranged inside the forming tube, a ball valve arranged at the bottom end of the forming tube; the tin ball forming plate comprises two pieces of groove plates arranged adjacently and having semicircular grooves on the upper surfaces, the outer sides of the two groove plates are hinged to the inner wall of the kettle through hinges, and the inner sides of the two groove plates are hinged to a hanger; the hanger is two symmetrically arranged connecting rods, the top ends of the two connecting rods are hinged together and are externally connected with a height adjuster, the lower ends of the two connecting rods are respectively hinged to the middle parts of the inner sides of the two groove plates, a mounting frame for mounting and fixing a fixed roller is arranged above the hanger, a chain is strung over the fixed roller, the other end of the chain is connected to a wire winding disc arranged in the height adjuster, the wire winding disc is controlled to rotate forward or reverse through a height adjuster controller, the hanger is pulled to be lifted or pressed, thereby controlling the opening and closing of the two groove plates; the kettle and the forming tube are filled with forming liquid which is higher than the tin ball forming plate; the lower end of the tin wire conveying pipe extends into the kettle; after the tin wire falling from the conveying pipe enters the kettle and falls on the groove plate, the tin wire is completely melted on the forming plate in the forming liquid to form a tin ball, one tin wire forms one tin ball, the groove plate carrying the tin ball is controlled by the height adjuster controller to drive the height adjuster to be pressed, the groove plate is rotated downward along the hinge connected to the inner wall of the kettle to be opened, the tin ball falls into the forming tube, is gradually cooled during falling along the forming tube, and finally sinks at the bottom of the forming tube to obtain a tin ball with a diameter of 1.0mm-3.0mm.

[0012] The control system comprises a first temperature controller connected to the first thermocouple, a second temperature controller connected to the second thermocouple, a height adjuster controller for controlling the height of the tin ball forming plate, a control switch connected to the fixed shaft controller, a control switch of the conveying shaft motor, a control switch of the blade driving motor, a control switch of the pressing strip electric push rod mechanism, control switches of the top electric push rod mechanism and the bottom electric push rod mechanism; the first temperature controller, the second temperature controller, the height adjuster controller and all the control switches are arranged in the control box.

[0013] Further, a vertical long hole is formed in the conveying shaft mounting frame, a conveying shaft mounting seat and a pressing strip adjusting rod fixed to the conveying shaft mounting seat are mounted in the long hole, and the upper end of the pressing strip adjusting rod is fixed to the top end of the long hole; a pressing strip sleeve is arranged at each end of the pressing strip, the pressing strip sleeve is sleeved on the pressing strip adjusting rod and can slide up and down; a pressing strip electric push rod mechanism is mounted at the top of the long hole, the piston rod of the electric push rod mechanism faces downward and is connected to the pressing strip, the pressing strip electric push rod mechanism is controlled through the control system to press down or lift up the pressing strip; the two ends of the conveying shaft are mounted in the conveying shaft mounting seat, a conveying shaft motor for driving the conveying shaft to rotate is mounted on the conveying shaft mounting frame, and the output shaft of the conveying shaft motor is connected to the conveying shaft.

[0014] Further, a vertical long hole is formed on the fixed shaft mounting frame, a vertical stand is arranged in the long hole, the two ends of the upper fixed shaft are respectively provided with upper fixed shaft sleeves, the two ends of the lower fixed shaft are also respectively provided with lower fixed shaft sleeves, the upper fixed shaft sleeves and the lower fixed shaft sleeves are sleeved on the stand and can slide up and down; electric push rods are symmetrically installed at the top and the bottom of the long hole, the piston rod of the top electric push rod mechanism faces downward and is connected with the upper fixed shaft, the piston rod of the bottom electric push rod mechanism faces upward and is connected with the lower fixed shaft, the top electric push rod mechanism and the bottom electric push rod mechanism are controlled to push out or reversely recover by a controller, and the upper fixed shaft and the lower fixed shaft are moved towards each other or reversely moved to loosen.

[0015] Further, the moving mechanism is a guide rail mechanism or a nut pair mechanism symmetrically installed on both sides of the base and located between the conveying shaft mounting frame and the fixed shaft mounting frame; when the guide rail mechanism is adopted, guide rails are installed on both sides of the base, and sliders are matched with the guide rails, the left and right ends of the perforated plate are provided with feet, and the feet are installed on the sliders, and the moving of the perforated plate is realized through the reciprocating movement of the sliders; when the nut pair mechanism is adopted, lead screws with nuts are matched with the base on both sides, the feet of the perforated plate are installed on the nuts, the movement of the nuts is driven through the rotation of the lead screws, and the movement of the perforated plate is realized.

[0016] Further, the pot body is a square pot body, and the shredding and feeding assembly is symmetrically arranged above both sides of the pot body.

[0017] Further, the pot body of the spheroidizing and cooling assembly is externally connected with a liquid level controller for controlling the liquid level of the formed liquid in the pot body through a pipeline, and the liquid level controller is connected with a formed liquid storage tank through a pipeline.

[0018] Further, a bottom box is arranged below the forming pipe of the spheroidizing and cooling assembly, and a discharge port with a valve is arranged at the bottom end of the bottom box.

[0019] The method for preparing tin balls by using the device for preparing large-size tin balls through predetermined amount and spheroidizing treatment according to the application is as follows:

[0020] 1) Wire cutting: according to the size of the tin ball to be produced, the length of the tin wire required is calculated, the distance between the cutting blade and the upper and lower fixed shafts is adjusted in advance, then the tin wire head of the winding roller is pulled out and inserted between the transmission shaft and the pressing strip, the pressing strip is pressed down by the electric push rod mechanism, and the tin wire is clamped between the transmission shaft and the pressing strip; then the transmission shaft motor is started, under the drive of the transmission shaft, the tin wire moves forward to the front end and is inserted between the upper and lower fixed shafts, when the tin wire sensor detects that the tin wire has been inserted between the upper and lower fixed shafts, the control system starts the fixed shaft controller to control the upper and lower fixed shafts to close and clamp the tin wire, then the blade driving motor is started to drive the cutting blade to move forward along the cutting knife slide rail while rotating at high speed to cut the tin wire, after cutting is completed, the fixed shaft controller sends a signal to control the upper and lower fixed shafts to loosen, the cut tin wire falls onto the conveying belt, and the conveying belt controller controls the conveying belt to start and convey the cut tin wire to the tin wire conveying hole and then to the pot body of the spheroidization and cooling assembly through the tin wire conveying pipe.

[0021] 2) Spheroidization and cooling: the tin wire on the conveying belt falls from the tin wire conveying pipe into the pot body and falls onto the groove plate, is heated by the pot body heating jacket, the temperature of the forming liquid in the pot body is kept not lower than 350 DEG C, the heating temperature of the forming plate is controlled to be 230-330 DEG C, and the spheroidization time of the tin wire is controlled to be 3-15 S, after the tin wire is completely melted on the groove plate in the forming liquid, tin balls with a diameter greater than 1.5 mm are formed and fall into the semicircular groove, one tin ball is formed by one section of tin wire; the height adjuster controller is pressed, the connecting rod is pressed down by the height adjuster, the groove plate is driven to rotate downward along the hinge connected to the inner wall of the pot body to be opened, the tin balls roll along the semicircular groove and fall into the forming pipe; circulating cooling water is injected into the cooling jacket, the temperature in the forming pipe is controlled to be 30-150 DEG C, the tin balls are gradually cooled and shaped during falling along the forming pipe, and finally are deposited at the bottom of the forming pipe; after the tin balls are slid off, the height adjuster controller is pressed again, the tin ball forming plate is lifted by the height adjuster, the groove plate is driven to return to the horizontal state, and the next batch of falling tin wire is received.

[0022] Further, the ball valve at the bottom end of the forming pipe is opened, the cooled tin balls are sent into the bottom box, when the amount of the tin balls in the bottom box accumulates to a certain amount, the valve at the discharge port is opened, the tin balls are discharged, cleaned and sieved, and qualified large-size tin ball products are obtained.

[0023] Further, the forming liquid is one or more of peanut oil, castor oil and glycerol.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The present application can control the size of tin ball by cutting and quantitatively control, and produce large size tin ball with uniform size and good roundness. The principle of tin liquid shrinking into ball under the action of surface tension in forming liquid can be used to realize the preparation of large size BGA tin ball with diameter of 1.5-3mm. The liquid tin ball falls in forming liquid and gradually cools and sets, which can effectively relieve the problem of mutual influence between the need of rapid setting of ball shape and slow crystallization of metal, and improve the surface quality of tin ball. The tin ball preparation device of the present application is designed ingeniously, easy to operate, and can be flexibly adjusted according to the need, and produce large size tin ball with multiple specifications, and has high production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a front view of the device for preparing large size tin ball by predetermined amount and synergistic balling treatment of the present application;

[0027] Figure 2 is a schematic view of the cutting and feeding assembly of the device of the present application;

[0028] Figure 3 is a schematic view of an embodiment of the transmission shaft adjusting mechanism in the cutting and feeding assembly of the device of the present application;

[0029] Figure 4 is the A-A sectional view of Figure 3 ;

[0030] Figure 5 is a schematic view of the installation of cutting blade in the cutting and feeding assembly of the device of the present application;

[0031] Figure 6 is a schematic view of an embodiment of the installation of upper fixed shaft and lower fixed shaft on the fixed shaft mounting frame in the cutting and feeding assembly of the device of the present application;

[0032] Figure 7 is the B-B sectional view of Figure 6 ;

[0033] Figure 8 is the top view of the groove plate of the tin ball forming plate of the device of the present application;

[0034] Figure 9 is the schematic view of the downward overturning and tilting of the groove plate of the tin ball forming plate and its control mechanism;

[0035] Figure 10 is the schematic view of the reset state of the groove plate of the tin ball forming plate and its control mechanism;

[0036] Figure 11 is the scanning graph of the tin ball prepared by embodiment 1 of the present application;

[0037] Figure 12 is the scanning graph of the tin ball prepared by embodiment 2 of the present application;

[0038] Figure 13 The tin ball scanning graph prepared for the embodiment 3 of the present application;

[0039] Figure 14 The tin ball scanning graph prepared for the embodiment 4 of the present application.

[0040] In the figure, 1 is a pot body, 2 is an upper cover, 3 is a pot body heating jacket, 4 is a first thermocouple, 5 is a forming tube, 6 is a second thermocouple, 7 is a cooling jacket, 8 is a ball valve, 9 is a first temperature controller, 10 is a second temperature controller, 11 is a tin ball forming plate, 1101 is a groove plate, 1101a is a semicircular groove, 1102 is a hinge, 1103 is a connecting rod, 1104 is a fixed roller, 1105 is a chain, 12 is a height adjuster controller, 13 is a liquid level controller, 14 is a wire cutting feeding assembly, 1401 is a base, 1402 is a wire winding roller mounting frame, 1403 is a conveying shaft mounting frame, 1404 is a wire winding roller, 1405 is a pressing strip, 1406 is a fixed shaft mounting frame, 1407 is a conveying shaft, 1407a is a pressing strip adjusting rod, 1407b is a conveying shaft mounting seat, 1407c is a pressing strip sleeve, 1407d is a pressing strip electric push rod mechanism, 1407e is a conveying shaft motor, 1408 is a perforating plate, 1409 is a sliding block seat, 1410 is a nut pair mechanism, 1411 is a cutting blade, 1412 is a blade driving motor, 1413 is a cutting knife sliding rail, 1414 is a tin wire perforation, 1415 is an upper fixed shaft, 1415a is an upper fixed shaft sleeve, 1416 is a lower fixed shaft, 1416a is a lower fixed shaft sleeve, 1417 is a tin wire inductor, 1418 is a fixed shaft controller, 1419 is a vertical rod, 1420 is a conveying belt controller, 1421 is a conveying belt, 1422 is a tin wire conveying hole, 1423 is a tin wire conveying pipe, 1425 is a top electric push rod mechanism, 1426 is a bottom electric push rod mechanism, 15 is a height adjuster, a wire winding disc 15a, 16 is a forming liquid storage tank, 17 is a bottom box, 18 is a discharge port. DETAILED DESCRIPTION

[0041] The technical solutions of the present application will be described clearly and completely in combination with the drawings and embodiments, and the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The protection scope of the present application is not limited to the embodiments, and any equivalent technical replacement within the scope of the claims of the present application is within the protection scope of the present application.

[0042] As shown in Figure 1 The device for preparing large-size tin balls by predetermined amount and synergistic spheroidization treatment of the present application comprises a wire cutting feeding assembly 14, a spheroidization cooling assembly below the wire cutting assembly, and a control system.

[0043] The wire cutting feeding assembly is as shown in Figure 2As shown, the system includes a base 1401, a winding roller mounting bracket 1402 mounted on the base and arranged sequentially from rear to front, a conveyor shaft mounting bracket 1403, a movable perforated plate 1408, a cutter slide rail 1413 horizontally mounted on the upper rear side of the perforated plate, a cutter mechanism reciprocating along the cutter slide rail, and a fixed shaft mounting bracket 1406. A set of winding rollers 1404 are sequentially mounted on the horizontal crossbeam of the winding roller mounting bracket. Figure 2 Two winding rollers are schematically shown in the diagram, and the solder wire is unwound on the winding rollers. An adjustable pressure bar 1405 and a conveyor shaft 1407 located below the pressure bar are horizontally mounted on the conveyor shaft mounting bracket. A row of solder wire perforations 1414 are evenly distributed horizontally on the perforated plate 1408. Moving mechanisms 1410 are provided on both sides of the base, and the bottom ends of both sides of the perforated plate are mounted on the moving mechanisms, allowing the perforated plate to reciprocate longitudinally along the base.

[0044] The adjustment mechanism for the vertical movement of the pressure bar 1405 can employ various commonly used adjustment mechanisms in the prior art. The structure used in this embodiment is as follows: Figure 2 , Figure 3 , Figure 4 As shown, a vertical elongated hole is provided on the conveyor shaft mounting bracket 1403. A conveyor shaft mounting base 1407b and a pressure strip adjusting rod 1407a fixed to the conveyor shaft mounting base are installed in the elongated hole. The upper end of the pressure strip adjusting rod is fixed to the top of the elongated hole. Pressure strip sleeves 1407c are respectively attached to both ends of the pressure strip, and the pressure strip sleeves are fitted onto the pressure strip adjusting rod 1407a and can slide up and down. A pressure strip electric push rod mechanism 1407d is installed at the top of the elongated hole. The piston rod of the electric push rod mechanism faces downward and is connected to the pressure strip 1405. The control system controls the pressure strip electric push rod mechanism to press the pressure strip down or lift it up. Both ends of the conveyor shaft are installed in the conveyor shaft mounting base, and the conveyor shaft motor 1407e, which drives the conveyor shaft to rotate, is installed on the conveyor shaft mounting bracket. The output shaft of the conveyor shaft motor is connected to the conveyor shaft. Figure 5 As shown, the cutting mechanism includes a slider seat 1409 mounted on the cutting slide rail 1413 and capable of reciprocating along the slide rail, a disc-shaped cutting blade 1411 fixedly mounted on the slider seat, and a blade drive motor 1412. During the movement of the slider seat controlled by the control system, the blade drive motor drives the cutting blade 1411 to rotate, cutting the solder wire.

[0045] The guide rail mechanism or nut pair mechanism 1410 is symmetrically arranged between the transmission shaft mounting frame 1403 and the fixed shaft mounting frame 1406 on both sides of the base. When the guide rail mechanism is used, guide rails are mounted on both sides of the base, and sliders are fitted on the guide rails. The left and right ends of the perforated plate 1408 are provided with feet, and the feet are mounted on the sliders. The movement of the perforated plate is realized by the reciprocating movement of the sliders. The guide rail mechanism is a commercially available product of the prior art. When the nut pair mechanism is used, a screw rod with a nut is fitted on both sides of the base. The feet of the perforated plate 1408 are mounted on the nut. The movement of the perforated plate is realized by rotating the screw rod to drive the nut to move. The nut pair mechanism is a commercially available product of the prior art.

[0046] The upper fixed shaft 1415 and the lower fixed shaft 1416 are horizontally mounted on the fixed shaft mounting frame 1406 and abut each other in an adjustable height manner. The fixed shaft controller 1418 for controlling the upward and downward movement of the upper fixed shaft and the lower fixed shaft is arranged on one side of the base. The tin wire inductor 1417 is arranged on the perforated plate 1408 and the fixed shaft mounting frame. A group of conveyors 1421 corresponding to the tin wire perforator 1414 are arranged on the base in front of the perforated plate. A group of tin wire conveying holes 1422 are arranged at the front end of the base and are in abutment with the end of the conveyor. A tin wire conveying pipe 1423 connected to the tin wire conveying hole is connected to the bottom surface of the base. The conveyor controller 1420 for controlling the operation of the conveyor 1421 is arranged on one side of the base. After the tin wire on the winding roller 1404 is unwound and passes between the pressing strip 1405 and the transmission shaft 1407 and is clamped, the tin wire is sent to the space between the upper fixed shaft 1415 and the lower fixed shaft 1416 by rotating the transmission shaft. The cutting length of the tin wire is set in advance. The distance between the cutting blade and the fixed shaft is adjusted. After the tin wire inductor 1417 detects that the tin wire has been inserted between the upper fixed shaft and the lower fixed shaft, the fixed shaft controller 1418 controls the upper fixed shaft and the lower fixed shaft to move closer to clamp the tin wire. The cutting blade is started. The cutting blade rotates at a high speed along the cutting blade running track to cut the tin wire. After the cutting is completed, the fixed shaft controller 1418 sends a signal to control the upper fixed shaft and the lower fixed shaft to loosen. The cut tin wire falls onto the conveyor 1421. The conveyor is started to convey the cut tin wire to the tin wire conveying hole 1422 and then to the pot 1 of the subsequent spheroidization assembly through the tin wire conveying pipe 1423. Each group of tin wire cutting feeding assemblies can be provided with multiple winding rollers. Multiple tin wire perforators are arranged on the perforated plate. Multiple tin wires can be cut at a time. The tin wire alloy components commonly used in this embodiment are SnAg3Cu0.5 or SnAg1Cu0.5 or Sn63Cu37.

[0047] The upper fixed shaft 1415 and the lower fixed shaft 1416 are controlled by the fixed shaft controller 1418 to move closer to each other or to loosen in the opposite direction. The existing technology mechanism can be used. In this embodiment, the fixed shaft controller 1418 is a stepping motor. Figure 6 、 Figure 7As shown, a vertical long hole is opened on the fixed shaft mounting frame 1406, and a vertical stand 1419 is arranged in the long hole. The two ends of the upper fixed shaft 1415 are respectively provided with upper fixed shaft sleeves 1415a, and the two ends of the lower fixed shaft 1416 are also respectively provided with lower fixed shaft sleeves 1416a. The upper fixed shaft sleeves and the lower fixed shaft sleeves are sleeved on the stand and can slide up and down. Electric push rods are symmetrically installed at the top and bottom of the long hole. The piston rod of the top electric push rod mechanism 1425 faces downward and is connected with the upper fixed shaft, and the piston rod of the bottom electric push rod mechanism 1426 faces upward and is connected with the lower fixed shaft. The top electric push rod mechanism and the bottom electric push rod mechanism are controlled by the fixed shaft controller 1418 to push out or retract reversely, so as to realize the moving close or moving apart of the upper fixed shaft 1415 and the lower fixed shaft 1416.

[0048] The spheroidization cooling assembly comprises a pot body 1, an upper cover 2 arranged on the top of the pot body, a pot body heating jacket 3 arranged outside the pot body, a first thermocouple 4 and a tin ball forming plate 11 arranged in the pot body, a forming pipe 5 located below the pot body and communicated with the pot body, a cooling jacket 7 arranged outside the lower section of the forming pipe, a second thermocouple 6 arranged in the forming pipe, and a ball valve 8 arranged at the bottom end of the forming pipe. Figure 1 、 Figure 8 、 Figure 9 、 Figure 10 As shown, the spheroidization cooling assembly comprises a pot body 1, an upper cover 2 arranged on the top of the pot body, a pot body heating jacket 3 arranged outside the pot body, a first thermocouple 4 and a tin ball forming plate 11 arranged in the pot body, a forming pipe 5 located below the pot body and communicated with the pot body, a cooling jacket 7 arranged outside the lower section of the forming pipe, a second thermocouple 6 arranged in the forming pipe, and a ball valve 8 arranged at the bottom end of the forming pipe. Figure 8Six semicircular grooves 1101a are shown. The forming tank and the forming tube are filled with forming liquid which covers the tin ball forming plate. The forming liquid is one or several of peanut oil, castor oil, glycerin. The lower end of the tin wire delivery tube 1423 extends into the forming tank. After the upper cover 2 is opened, the tin wire falling from the delivery tube falls into the forming tank and lands on the groove plate 1101. The tin wire melts completely on the forming plate in the forming liquid and forms tin balls. One piece of tin wire forms one tin ball. The height adjuster controller 12 is pressed to control the rotation of the wire winding disc 15a in the height adjuster 15. The connecting rod 1103 is pressed down to drive the groove plate 1101 to rotate downward along the hinge 1102 connected to the inner wall of the forming tank to be opened, as shown in Figure 9 The tin balls fall into the forming tube 5 and gradually cool down during the falling process and finally sink to the bottom of the forming tube. Then the wire winding disc 15a in the height adjuster 15 is reversely rotated to lift the connecting rod 1103 to drive the groove plate 1101 to rotate upward along the hinge 1102 connected to the inner wall of the forming tank to be reset, as shown in Figure 10 The groove plate 1101 is ready to receive the tin wire falling again.

[0049] The control system includes the first temperature controller 9 connected to the first thermocouple 1, the second temperature controller 10 connected to the second thermocouple 6, the height adjuster controller 12 controlling the height of the tin ball forming plate 11, the control switch connected to the fixed shaft controller 1418, the control switch of the transmission shaft motor, the control switch of the blade driving motor 1412, the control switch of the cam electric push rod 1407d, the control switches of the top electric push rod mechanism 1425 and the bottom electric push rod mechanism 1426. The first temperature controller 9, the second temperature controller 10, the height adjuster controller 12 and all the control switches are arranged in the control box.

[0050] As a preferred configuration, the forming tank 1 adopts a square tank so that two sets of wire cutting and feeding assemblies can be symmetrically arranged on the two sides above the tank to improve the production efficiency.

[0051] In order to ensure the stable production state and make the tin wire falling into the tank always covered by the forming liquid, the tank 1 is externally connected with a liquid level controller 13 through a pipeline to control the liquid level of the forming liquid in the tank. The liquid level controller is connected to the forming liquid storage tank 16 through a pipeline.

[0052] A bottom tank 17 can also be arranged below the forming tube 5 of the spheroidization and cooling assembly. A discharge port 18 with a valve is arranged at the bottom end of the bottom tank.

[0053] The method for preparing tin balls by using the device for preparing large-size tin balls by the predetermined amount and spheroidization treatment according to the present application is as follows:

[0054] 1) Wire cutting: according to the size of the tin ball to be produced, calculate the length of tin wire needed, adjust the distance between the cutting blade 1411 and the upper and lower fixed shafts in advance, then pull the tin wire head of the winding roller 1404 between the transmission shaft 1407 and the pressing strip 1405, press the pressing strip down through the pressing strip electric push rod mechanism 1407d to clamp the tin wire between the transmission shaft and the pressing strip; then start the transmission shaft motor 1407e, under the drive of the transmission shaft 1407, the tin wire moves forward to the front end between the upper fixed shaft 1415 and the lower fixed shaft 1416, after the tin wire sensor 1417 detects that the tin wire has been inserted between the upper fixed shaft and the lower fixed shaft, the control system starts the fixed shaft controller 1418 to control the upper fixed shaft and the lower fixed shaft to close and clamp the tin wire, then the blade driving motor 1412 starts to drive the cutting blade 1411 to move along the cutting blade running track while rotating at high speed to cut the tin wire, after cutting is completed, the fixed shaft controller 1418 sends a signal to control the upper fixed shaft and the lower fixed shaft to loosen, and the cut tin wire falls onto the conveyor belt 1421, and the conveyor belt starts to convey the cut tin wire to the tin wire conveying hole 1422 and then falls into the pot body 1 of the subsequent spheroidization assembly through the tin wire conveying pipe 1423.

[0055] 2) Spheroidization and cooling: the tin wire on the conveyor belt 1421 falls into the pot body 1 from the tin wire conveying pipe 1423 and falls onto the groove plate, is heated to 230~330℃ by the pot body heating jacket 3, melts and spheroidizes in the forming liquid, the spheroidization time of the tin wire is controlled to be 3~15S, and the temperature of the forming liquid in the pot body is kept not lower than 350℃. After the tin wire completely melts on the tin ball forming plate 11 in the forming liquid, the tin ball is formed and falls into the semicircular groove 1101a, the height adjuster controller 12 is pressed, the connecting rod 1103 is pressed down through the height adjuster 15, the groove plate 1101 is driven to rotate downward along the hinge 1102 connected to the inner wall of the pot body to be opened, as shown in FIG. 2, the tin ball rolls along the semicircular groove to the forming pipe 5 in the direction of the arrow in the figure. Circulating cooling water is injected into the cooling jacket 7, the temperature in the forming pipe is controlled to be 30~150℃, the tin ball is gradually shaped and cooled during falling along the forming pipe, and finally is deposited at the bottom of the forming pipe. After the tin ball slides off, the height adjuster controller 12 is pressed again, the connecting rod 1103 is lifted up through the height adjuster 15, the groove plate 1101 is driven to return to the horizontal state, and waits for the next batch of falling tin wire. Figure 8

[0056] 3) Open the ball valve 8 at the bottom end of the forming pipe to send the cooled tin ball into the bottom box 17, when the amount of tin balls in the bottom box accumulates to a certain amount, open the valve of the discharge port 18 to discharge the tin balls, clean and sieve to obtain qualified large-size tin ball products. Example 1

[0057] ​First, close the ball valve 8, by operating the height adjuster controller 12, adjust the tin ball forming plate 11 to the working height and make it closed. Using peanut oil as the forming liquid, open the liquid level controller 13, immerse the tin ball forming plate in peanut oil about 1 cm high, set the tin ball forming liquid temperature to 280-320℃, control the temperature of the forming transition section (the length of the forming tube above the cooling jacket 7) below the tin ball forming plate to 40-100℃, and the cooling temperature at the bottom of the forming tube is normal temperature. The target tin ball product is SnAg3Cu0.5φ2.6mm tin ball, using 1mm tin wire cutting and remelting, calculate the cutting length by formula, the formula is L=(2R1^3) / (3R2^2), where R1 is the diameter of the tin ball, R2 is the diameter of the tin wire, and L is the cutting length. The cutting length is 11.72mm. Set the cutting parameters to start the tin wire feeding assembly, the cut tin wire falls along the tin wire conveying pipe to the tin ball forming plate, the tin wire completely melts and forms on the tin ball forming plate, 5 seconds later, the height adjuster controller 12 adjusts the height adjuster 15, loosens the connecting rod 1103, and the inside of the tin ball forming plate is tilted downward, so that the formed tin balls fall slowly from the forming tube transition section to the bottom of the forming tube for cooling and forming. Repeat the above operation to continuously produce tin balls. The liquid level controller monitors the liquid level in the kettle in real time, and when the liquid level is lower than the set height, the forming liquid in the standby forming liquid storage tank 16 is supplemented to the kettle in time through the pipeline. After some tin balls accumulate at the bottom of the forming tube 5, stop heating and feeding, open the ball valve 8, and put the tin balls into the bottom box 17. Then close the ball valve 8 and repeat the above production. When the tin balls in the bottom box are stored to a certain amount, open the discharge valve of the bottom box, and put out the tin balls. After washing, drying and screening, the qualified products are obtained. The obtained tin ball product is sampled and scanned, and the scanning results are shown in Figure 11 , the sphericity is good. Randomly take 10 samples to measure the diameter of the tin balls, and the measurement results are shown in Table 1. The diameter error of each ball in the sample is within the range of 0.04-0.16mm, and the error is small. Example 2

[0058] The steps of preparing tin balls in this example are the same as those in Example 1, except that the tin ball forming liquid temperature is set to 280-320℃, the forming transition section temperature is controlled to 40-60℃, the target tin ball product is SnAg1Cu0.5φ2mm tin ball, and the tin wire cutting and remelting uses 1mm tin wire, and the tin wire cutting length is 5.33mm. The tin balls completely melt and form on the tin ball forming plate, and 3 seconds later, the height adjuster controller 12 adjusts the height adjuster 15, loosens the connecting rod 1103, and puts the formed tin balls into the forming tube. The tin ball product obtained in this example is sampled and scanned, and the scanning results are shown in Figure 12 . Randomly take 10 samples, and the measured diameter of the tin balls is shown in Table 1. Example 3

[0059] The steps of preparing the tin ball in this embodiment are the same as those in Embodiment 1, except that castor oil is used as the forming liquid, the tin ball forming liquid temperature is set to 260-300℃, and the forming transition section temperature is controlled to 60-100℃. The target tin ball product is SnAg3Cu0.5φ2.6mm tin ball, which is prepared by cutting and remelting 1mm tin wire, and the tin wire shearing length is 11.72mm. After the tin ball is formed on the tin ball forming plate for 3 seconds, the height adjuster controller 12 adjusts the height adjuster 15, loosens the connecting rod 1103, and places the formed tin ball into the forming tube, and the cooling temperature is normal temperature. The tin ball product obtained in this embodiment is sampled and scanned, and the scanning results are shown in Figure 13 Ten samples are randomly taken, and the measured tin ball diameters are shown in Table 1. Embodiment 4

[0060] The steps of preparing the tin ball in this embodiment are the same as those in Embodiment 1, except that castor oil is used as the forming liquid, the tin ball forming liquid temperature is set to 260-300℃, and the forming transition section temperature is controlled to 60-100℃. The target tin ball product is SnAg3Cu0.5φ2.6mm tin ball, which is prepared by cutting and remelting 1mm tin wire, and the tin wire shearing length is 11.72mm. After the tin ball is formed on the tin ball forming plate for 3 seconds, the height adjuster controller 12 adjusts the height adjuster 15, loosens the connecting rod 1103, and places the formed tin ball into the forming tube, and the cooling temperature is normal temperature. The tin ball product obtained in this embodiment is sampled and scanned, and the scanning results are shown in Figure 14 Ten samples are randomly taken, and the measured tin ball diameters are shown in Table 1.

[0061] Table 1 Tin ball size statistical analysis table (unit: mm)

[0062]

[0063] Although the present application has been described in detail in the foregoing description, it will be understood by those skilled in the art that various modifications or improvements can be made to the present application without departing from the spirit of the present application. Therefore, all other embodiments obtained without creative labor fall within the scope of the present application.

Claims

1. An apparatus for preparing large size tin balls by pre-measured amount and synergic balling process, characterized by, The device comprises a wire-cut feeding assembly (14), a spheroidizing and cooling assembly below the wire-cut feeding assembly, and a control system; The wire-cut feeding assembly (14) comprises a base (1401), a wire winding roller mounting rack (1402) installed on the base and arranged in sequence from the rear to the front, a conveying shaft mounting rack (1403), a movable perforated plate (1408), and a cutter slide rail (1413) horizontally mounted on the upper part of the front side of the perforated plate, a cutter mechanism movable along the cutter slide rail, and a fixed shaft mounting rack (1406); a set of wire winding rollers (1404) are sequentially sleeved on the horizontal cross arm of the wire winding roller mounting rack; a movable pressing strip (1405) and a conveying shaft (1407) below the pressing strip are horizontally mounted on the conveying shaft mounting rack; a conveying shaft motor and a pressing strip electric push rod mechanism (1407d) are further arranged on the conveying shaft mounting rack; tin wire perforations (1414) are evenly arranged on the perforated plate (1408) in the horizontal direction; a moving mechanism is arranged on both sides of the base, and the bottom ends of the two sides of the perforated plate are mounted on the moving mechanism and movable along the base in the longitudinal direction; The cutter mechanism comprises a slider block (1409) fitted on the cutter slide rail (1413) and movable along the cutter slide rail, a cutting blade (1411) fixedly installed on the slider block, and a blade driving motor (1412); An upper fixed shaft (1415) and a lower fixed shaft (1416) abutting and adjustable in height are horizontally mounted on the fixed shaft mounting rack, and a top electric push rod mechanism (1425) and a bottom electric push rod mechanism (1426) are further arranged on the fixed shaft mounting rack; a fixed shaft controller (1418) for controlling the upward and downward movements of the upper fixed shaft and the lower fixed shaft is arranged on one side of the base; tin wire inductors (1417) are arranged on the perforated plate (1408) and the fixed shaft mounting rack, respectively; a set of conveying belts (1421) corresponding to the tin wire perforations (1414) are arranged on the base in front of the perforated plate; a set of tin wire conveying holes (1422) are arranged on the front end of the base and are in butt joint with the ends of the conveying belts; a tin wire conveying pipe (1423) connected with the tin wire conveying holes is connected to the bottom surface of the base; and a conveying belt controller (1420) for controlling the operation of the conveying belts (1421) is arranged on one side of the base. The spheroidization and cooling assembly comprises a kettle body (1), an upper cover (2) arranged on the top of the kettle body, a kettle heating jacket (3) arranged outside the kettle body, a first thermocouple (4) and a solder ball forming plate (11) arranged inside the kettle body, a forming tube (5) arranged below the kettle body and communicated with the kettle body, a cooling jacket (7) arranged outside the forming tube, a second thermocouple (6) arranged inside the forming tube, and a ball valve (8) arranged at the bottom end of the forming tube; the solder ball forming plate (11) comprises two pieces of groove plates (1101) arranged in abutment and provided with semicircular grooves on the upper surfaces, the outer sides of the two groove plates are hinged to the inner wall of the kettle body through hinges (1102), and the inner sides of the two groove plates are hinged to a hanger; the hanger is two symmetrically arranged connecting rods (1103), the top ends of the two connecting rods are hinged together and are externally connected with a height adjuster (15), the lower ends of the two connecting rods are respectively hinged to the middle portions of the inner sides of the two groove plates, a mounting rack for mounting a fixed roller (1104) is arranged above the hanger, a chain is strung over the fixed roller, the other end of the chain is connected to a wire winding disc (15a) arranged in the height adjuster, the wire winding disc is controlled to rotate forward or reversely through a height adjuster controller (12), the hanger is pulled to be lifted or pressed, and then the two groove plates are controlled to be opened or closed; the kettle body and the forming tube are filled with forming liquid which is higher than the solder ball forming plate; the lower end of a solder wire conveying pipe (1423) extends into the kettle body; after the upper cover (2) is opened, the solder wire falling from the conveying pipe falls on the groove plates (1101) in the kettle body, the solder wire is completely melted on the forming plate in the forming liquid to form solder balls, one piece of solder wire forms one solder ball, the groove plate carrying the solder ball is controlled to be pressed down by the height adjuster controller, the groove plate is rotated downward along the hinges (1102) connected to the inner wall of the kettle body to be opened, the solder ball falls into the forming tube (5), is gradually cooled during falling along the forming tube, and finally sinks at the bottom of the forming tube to obtain solder balls with a diameter of 1.0mm-3.0mm; The control system comprises a first temperature controller (9) connected to the first thermocouple (4), a second temperature controller (10) connected to the second thermocouple (6), a height adjuster controller (12) for controlling the height of the solder ball forming plate (11), control switches connected to the fixed shaft controller (1418), the control switches of the conveying shaft motor, the control switches of the blade driving motor (1412), the control switches of the pressing strip electric push rod mechanism, the control switches of the top electric push rod mechanism (1425) and the bottom electric push rod mechanism (1426); the first temperature controller (9), the second temperature controller (10), the height adjuster controller (12) and all the control switches are arranged in a control box.

2. A device for preparing large size Sn balls by a pre-measured amount of co- sphericalization process according to claim 1, wherein, A vertical long hole is formed on the conveying shaft mounting frame (1403), a conveying shaft mounting seat (1407b) and a pressing strip adjusting rod (1407a) fixed to the conveying shaft mounting seat are mounted in the long hole, the upper end of the pressing strip adjusting rod is fixed to the top end of the long hole, a pressing strip sleeve (1407c) is arranged at the two ends of the pressing strip respectively, the pressing strip sleeve is sleeved on the pressing strip adjusting rod and can slide up and down, a pressing strip electric push rod mechanism (1407d) is mounted at the top of the long hole, the piston rod of the electric push rod mechanism faces downward and is connected with the pressing strip (1405), the pressing strip electric push rod mechanism is controlled by the control system to press down or lift up the pressing strip; the two ends of the conveying shaft are mounted in the conveying shaft mounting seat, a conveying shaft motor for driving the conveying shaft to rotate is mounted on the conveying shaft mounting frame, and the output shaft of the conveying shaft motor is connected with the conveying shaft.

3. A device for preparing large size Sn balls by a pre-measured amount co- sphericalization process according to claim 1, characterized in that, A vertical long hole is formed on the fixed shaft mounting frame (1406), a vertical stand rod (1419) is arranged in the long hole, the two ends of the upper fixed shaft (1415) are respectively provided with an upper fixed shaft sleeve (1415a), the two ends of the lower fixed shaft (1416) are also respectively provided with a lower fixed shaft sleeve (1416a), the upper fixed shaft sleeve and the lower fixed shaft sleeve are sleeved on the stand rod and can slide up and down, electric push rod mechanisms are symmetrically mounted at the top and the bottom of the long hole, the piston rod of the top electric push rod mechanism (1425) faces downward and is connected with the upper fixed shaft, the piston rod of the bottom electric push rod mechanism (1426) faces upward and is connected with the lower fixed shaft, the top electric push rod mechanism and the bottom electric push rod mechanism are controlled by the controller (1418) to push out or retract reversely, so that the upper fixed shaft and the lower fixed shaft move towards each other or move away reversely.

4. A device for preparing large size Sn balls by a pre-measured amount co- sphericalization process according to claim 1, wherein, The moving mechanism is a guide rail mechanism or a nut pair mechanism (1410) symmetrically mounted on the two sides of the base and located between the conveying shaft mounting frame (1403) and the fixed shaft mounting frame (1406); when the guide rail mechanism is adopted, guide rails are mounted on the two sides of the base, and sliders are matched with the guide rails, the left and right ends of the perforated plate (1408) are provided with feet, the feet are mounted on the sliders, and the movement of the perforated plate is realized through the reciprocating movement of the sliders; when the nut pair mechanism is adopted, screw rods matched with nuts are arranged on the two sides of the base, the feet of the perforated plate are mounted on the nuts, the movement of the nuts is driven by the rotation of the screw rods, and the movement of the perforated plate is realized.

5. A device for preparing large size Sn balls by a pre-measured amount of co- spherical processing according to claim 1 or 2 or 3 or 4, characterized in that, The pot body (1) is a square pot body, and the slicing feeding assembly is symmetrically arranged on the two sides above the pot body.

6. A device for preparing large size Sn balls by a pre-measured amount of co- spherical processing according to claim 1 or 2 or 3 or 4, characterized in that, The pot body (1) of the spheroidizing and cooling assembly is externally connected with a liquid level controller (13) for controlling the liquid level of the formed liquid in the pot body through a pipeline, and the liquid level controller is connected with a formed liquid storage tank (16) through a pipeline.

7. A device for preparing large size Sn balls by a pre-measured amount co- spheronization process according to claim 1 or 2 or 3 or 4, characterized in that, A bottom box (17) is arranged below the forming pipe (5) of the spheroidizing and cooling assembly, and a discharge port (18) with a valve is arranged at the bottom end of the bottom box.

8. A method of producing solder balls using the apparatus for producing large-size solder balls by a predetermined amount of co-balling treatment according to any one of claims 1 to 7, characterized in that, The method is as follows: 1) Wire cutting: according to the size of the tin ball to be produced, the length of the tin wire required is calculated, the distance between the cutting blade (1411) and the upper fixed shaft (1415) and the lower fixed shaft (1416) is adjusted in advance, then the tin wire head of the winding roller (1404) is pulled out and inserted between the transmission shaft (1407) and the pressing strip (1405), the pressing strip is pressed down by the pressing strip electric push rod mechanism (1407d), and the tin wire is clamped between the transmission shaft and the pressing strip; then the transmission shaft motor (1407e) is started, under the drive of the transmission shaft, the tin wire moves forward to the front end and is inserted between the upper fixed shaft and the lower fixed shaft, after the tin wire sensor (1417) detects that the tin wire has been inserted between the upper fixed shaft and the lower fixed shaft, the control system starts the fixed shaft controller (1418) to control the upper fixed shaft and the lower fixed shaft to close and clamp the tin wire, then the blade driving motor (1412) is started to drive the cutting blade (1411) to move forward along the cutting knife sliding rail while rotating at high speed to cut the tin wire, after cutting is completed, the fixed shaft controller sends a signal to control the upper fixed shaft and the lower fixed shaft to loosen, the cut tin wire falls onto the conveyor belt (1421), the conveyor belt controller (1420) controls the conveyor belt to start, the cut tin wire is transported to the tin wire conveying hole (1422) and falls into the pot body (1) of the spheroidization and cooling assembly through the tin wire conveying pipe (1423); 2) Spheroidization and cooling: the tin wire on the conveyor belt (1421) falls into the pot body (1) from the tin wire conveying pipe (1423) and falls on the groove plate (1101), is heated by the pot body heating jacket (3), the temperature of the forming liquid in the pot body is kept not lower than 350℃, the heating temperature of the forming plate is controlled to be 230~330℃, the spheroidization time of the tin wire is controlled to be 3~15S, after the tin wire is completely melted on the groove plate (1101) in the forming liquid, tin balls with a diameter greater than 1.5mm are formed and fall into the semicircular groove (1101a), one tin ball is formed by one section of tin wire; the height adjuster controller (12) is pressed, the connecting rod (1103) is pressed down by the height adjuster (15), the groove plate is driven to rotate downward along the hinge (1102) connected to the inner wall of the pot body to open, the tin balls roll along the semicircular groove and fall into the forming pipe (5); circulating cooling water is injected into the cooling jacket (7), the temperature in the forming pipe is controlled to be 30~150℃, the tin balls are gradually cooled and shaped during falling along the forming pipe, and finally are deposited at the bottom of the forming pipe; after the formed tin balls slide off, the height adjuster controller is pressed again, the tin ball forming plate is lifted by the height adjuster, the groove plate is driven to return to the horizontal state, and waits to receive the next batch of falling tin wires.

9. The method of claim 8, wherein, The ball valve (8) at the bottom end of the forming pipe is opened, the cooled tin balls are sent into the bottom box (17), when the amount of tin balls in the bottom box accumulates to a certain amount, the valve of the discharge port (18) is opened, the tin balls are discharged, washed and sieved to obtain qualified large-size tin ball products.

10. The method according to claim 8 or 9, characterized in that, The forming liquid is one or more of peanut oil, castor oil and glycerol.

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