Punching and processing integrated device for storage battery container

Abstract

The invention discloses a storage battery container punching and processing integrated device which comprises a rack, a conveying mechanism is arranged on the rack, two sets of stopping mechanisms are arranged on the two sides, corresponding to the conveying mechanism, of the rack in a staggered mode, stop rods used for stopping battery shells from moving are movably arranged on the stopping mechanisms, and the stopping mechanisms on the two sides can stop the two sets of battery shells; the punching and deburring integrated mechanism is connected to the rack and located above the conveying mechanism, a punching end and a deburring end are arranged on the punching and deburring integrated mechanism at intervals, and the punching end and the deburring end can machine the two sets of battery shells on the conveying mechanism at the same time. And the electric control cabinet is arranged on one side of the rack and electrically connected with the conveying mechanism, the stopping mechanism and the punching and deburring integrated mechanism, machining is efficient, the punching and deburring procedures are completed in an integrated mode, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of lead-acid battery production and processing, and specifically relates to an integrated battery slot punching and processing device. Background Art

[0002] The clusters in multiple cells of the battery need to be connected. Currently, the most common method is through-wall welding, that is, holes are punched on the partitions of multiple cells in the battery shell, and the busbars of each cell are welded together through the holes to achieve the series connection of the clusters. The battery shell is made of plastic, and after punching, burrs remain on the edges of the holes.

[0003] The remaining burrs on the shell holes will affect the subsequent welding quality of the cluster. The current method is that the burrs on the holes need to be manually removed after drilling, which increases the construction process, is inefficient, and cannot adapt to mass production line processing.

[0004] Therefore, how to provide an integrated battery slot punching device for use in a supporting production line is an urgent problem that technicians in this field need to solve. Summary of the invention

[0005] In view of this, the present invention provides an integrated battery slot punching processing device, which is suitable for use in a production line and can complete the punching and burr removal actions at one workstation, thereby achieving high work efficiency.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a battery slot punching processing integrated device, comprising:

[0007] A frame, wherein a conveying mechanism is arranged on the frame, and an upstream product conveying line and a downstream product conveying line connected to the conveying mechanism are arranged at both ends of the frame;

[0008] A blocking mechanism, wherein the blocking mechanism has two groups and is staggeredly arranged on both sides of the frame corresponding to the conveying mechanism, and the blocking mechanism is movably provided with a blocking rod for blocking the movement of the battery shell, and the blocking mechanisms on both sides can stop two groups of battery shells;

[0009] An integrated punching and deburring mechanism, the integrated punching and deburring mechanism is connected to the frame and is located above the conveying mechanism, a punching end and a deburring end are provided on the integrated punching and deburring mechanism at intervals, and the punching end and the deburring end can process two groups of battery shells on the conveying mechanism at the same time;

[0010] An electric control cabinet is arranged on one side of the frame and is electrically connected to the conveying mechanism, the blocking mechanism and the integrated punching and deburring mechanism.

[0011] The beneficial effect of the present invention is that the battery shells conveyed by the upstream product conveyor line enter the conveying mechanism, and the blocking mechanism is used to intercept the battery shells at a fixed position. It can be understood that the integrated punching and deburring mechanism is used to perform punching and deburring actions on at least two groups of intercepted battery shells, which is simple and efficient, completing the punching and deburring processing steps, and then the blocking mechanism releases the restriction on the battery shells at this position and sends them downstream for the next step of processing.

[0012] Preferably, two ends of the frame corresponding to the conveying mechanism are fixedly connected with protective grilles, and the protective grilles are provided with avoidance openings through which the avoidance battery housing passes.

[0013] The technical effect produced thereby is that the arranged avoidance opening enables the battery shell to move downstream sequentially.

[0014] Preferably, the conveying mechanism includes a conveyor belt, a guide plate and a power assembly, the guide plates are provided in two groups and are arranged in parallel and spaced apart on the frame, the conveyor belt is rotatably connected to the frame and is located between the two groups of guide plates, the power assembly is arranged on the frame and is transmission-connected to the conveyor belt, and the servo motor in the power assembly is electrically connected to the electric control cabinet.

[0015] The resulting technical effect is: the conveying mechanism is used to connect and convey the battery shell from the upstream and realize the movement of the battery shell on the conveying mechanism. During the movement, the punching and deburring integrated mechanism is used to complete the processing of the two steps of punching and deburring.

[0016] Preferably, the blocking mechanism includes an infrared sensor, a driving cylinder and a blocking rod, and the infrared sensor, driving cylinder and blocking rod are all arranged on an adjusting seat, and the infrared sensor and driving cylinder are respectively connected to the electric control cabinet by electrical signals, and the adjusting seat is connected to the frame in an adjustable position through a screw adjustment mechanism, and the infrared sensor is arranged toward one side of the conveying mechanism and is used to detect the passing state of the battery shell, one end of the driving cylinder and one end of the blocking rod are staggered and hinged on the adjusting seat, and the other end of the driving cylinder is hinged to the middle area of ​​the blocking rod and controls the rotation angle of the blocking rod, and the other end of the blocking rod can be rotated to be located above the conveying mechanism and stop the battery shell thereon.

[0017] The resulting technical effect is: the infrared sensor is used to detect the passage of the battery shell. When the battery shell passes through, the electrical control cabinet controls the drive cylinder to move and extends the barrier rod to block the top of the conveying mechanism. At this time, the battery shell is positioned under the restriction of the barrier rod. When both barrier rods block the battery shell, the electrical control cabinet controls the conveying mechanism to stop running. It can be understood that the two blocking mechanisms are arranged front and back in the axial direction, and are respectively used to stop the two groups of battery shells on the conveying mechanism, and then carry out the subsequent integrated work of punching and burr removal.

[0018] In addition, for the processing of battery shells of different models, the initial processing positions of the blocking mechanisms on both sides can be adjusted by using the lead screw adjustment structure, thereby facilitating the processing of battery shells of different models.

[0019] Preferably, the integrated punching and deburring mechanism includes a three-axis servo manipulator, a distance rod seat, a nail hole assembly and a burr removal assembly, the fixed end of the three-axis servo manipulator is fixed to one side of the frame, and the distance rod seat is fixed to the free end of the three-axis servo manipulator; the nail hole assembly is a punching end and is fixed to one end of the distance rod seat; the burr removal assembly is a deburring end and is fixed to the other end of the distance rod seat, and the three-axis servo manipulator, nail hole assembly and burr removal assembly are respectively connected to the electrical control cabinet with electrical signals.

[0020] The resulting technical effect is: the distance rod seat actually leaves a distance for the processing of the front and rear battery shells. It can be understood that the nail hole assembly is used to punch holes in the upstream battery shell partition, and the burr removal assembly is used to remove burrs on the punched holes of the previous battery shell. The burr removal assembly is actually a process of tracing the processing of the previous battery shell hole. The three-axis servo manipulator can be used to realize punching operations at different positions on the battery shell partition.

[0021] Preferably, the nail hole assembly is used to open holes on the battery housing partition, and the burr removal assembly is used to track and remove burrs remaining on the hole of the previous battery housing.

[0022] The resulting technical effect is that the nail hole component and the burr removal component actually work synchronously, except that the upstream and downstream groups of battery shell holes are processed separately. In this way, the two processes of punching and deburring can be completed at this workstation, making production efficient.

[0023] Preferably, the nail hole assembly includes a base, a telescopic cylinder, a driving arm, a positioning clamp seat and a punching head, the base is a right-angle seat, the base is fixed to one end edge of the distance rod seat, the telescopic cylinder is fixed to the top of the base and connected to the electrical signal of the electric control cabinet, the positioning clamp seat is fixed to the side end of the base, the driving arm is a bending arm, one end of the driving arm is hinged to the telescopic rod of the telescopic cylinder, and the other end edge is hinged to the positioning clamp seat, the punching head is vertically fixed to the other end of the driving arm, and the positioning clamp seat is provided with a avoidance slot through which the avoidance punching head passes.

[0024] The resulting technical effect is: in actual use, the telescopic cylinder is a pneumatic telescopic cylinder, which is used to drive the other end of the driving arm to swing, thereby completing the nailing process of the punching head, and the positioning clamp can locate the position of the partition on the battery shell, thereby facilitating the punching head to punch holes stably.

[0025] Preferably, the burr removal component includes an air pump, an air duct, a heater and a hot air blowpipe, the air pump is fixed on the frame and is electrically connected to the electric control cabinet, one end of the air duct is connected to the air outlet of the air pump, and the other end of the air duct is connected to the hot air blowpipe, the heater is fixed to the other end of the distance rod seat and is electrically connected to the electric control cabinet, the hot air blowpipe is fixed on the heater, and the air in the air duct is heated by the heater and blown out by the hot air blowpipe to remove the burrs remaining on the hole.

[0026] The resulting technical effect is: the air duct is connected to an external air pump to provide normal temperature air. Under the heating of the heater, the normal temperature air is heated to a certain temperature and blown out through the hot air blowpipe, thereby heating the residual burrs on the hole. During specific implementation, the temperature of the heater needs to be set appropriately to avoid excessively high temperature affecting the battery shell, or too low temperature to complete the deburring work. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The overall structure of the battery tank punching processing integrated device of the present invention Figure 1 ;

[0028] Figure 2 The overall structure of the battery tank punching integrated device of the present invention Figure 2 ;

[0029] Figure 3 A schematic diagram of a stopping mechanism of an integrated device for punching and processing a battery tank according to the present invention;

[0030] Figure 4 A schematic diagram of an integrated punching and deburring mechanism of an integrated battery slot punching and processing device of the present invention;

[0031] Figure 5 A schematic diagram of a nail hole assembly of an integrated battery slot punching processing device of the present invention;

[0032] Figure 6 A schematic diagram of a punching head of an integrated battery tank punching processing device of the present invention;

[0033] Figure 7 The invention discloses a blocking mechanism of an integrated battery slot punching device.

[0034] 1 frame, 2 conveying mechanism, 21 conveyor belt, 22 guide plate, 3 upstream product conveying line, 4 downstream product conveying line, 5 blocking mechanism, 51 infrared sensor, 52 driving cylinder, 53 stop rod, 6 battery housing, 7 punching and deburring integrated mechanism, 71 three-axis servo manipulator, 72 fixed distance rod seat, 73 nail hole assembly, 731 base, 732 telescopic cylinder, 733 driving arm, 734 positioning clamp seat, 735 punching head, 74 burr removal assembly, 741 air pump, 742 air duct, 743 heater, 744 hot air blowpipe, 8 electric control cabinet, 9 protective grille, 10 avoidance opening. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See the attached Figures 1 to 7 According to an embodiment of the present invention, a battery slot punching integrated device comprises:

[0037] Frame 1, which is the main load-bearing and installation base of the equipment. A conveying mechanism 2 is arranged on the frame 1. An upstream product conveying line 3 and a downstream product conveying line 4 connected to the conveying mechanism 2 are arranged at both ends of the frame 1. In this embodiment, the product conveying lines are roller conveying lines;

[0038] The blocking mechanism 5 has two groups and is staggeredly arranged on both sides of the frame 1 corresponding to the conveying mechanism 2. The blocking mechanism 5 is movably provided with a blocking rod 53 for blocking the movement of the battery housing 6. The blocking mechanisms 5 on both sides can stop two groups of battery housings;

[0039] The punching and deburring integrated mechanism 7 is connected to the frame 1 and is located above the conveying mechanism 2. The punching and deburring integrated mechanism 7 is provided with a punching end and a deburring end at intervals. The punching end and the deburring end can process two groups of battery shells on the conveying mechanism at the same time.

[0040] The electric control cabinet 8 is arranged on one side of the frame 1 , and the electric control cabinet 8 is electrically connected to the conveying mechanism 2 , the blocking mechanism 5 and the integrated punching and deburring mechanism 7 .

[0041] In other embodiments, the frame 1 is fixedly connected to two ends of the conveying mechanism 2 with protective grilles 9, and the protective grilles 9 are provided with avoidance openings 10 for the battery housing 6 to pass through, thereby ensuring that the battery housing on the conveying mechanism passes smoothly.

[0042] In other embodiments, the conveying mechanism 2 includes a conveyor belt 21, a guide plate 22 and a power assembly. There are two groups of guide plates 22 that are arranged in parallel and spaced apart on the frame 1. The conveyor belt 21 is rotatably connected to the frame 1 and is located between the two groups of guide plates 22. The power assembly is arranged on the frame and is transmission-connected to the conveyor belt 21. The servo motor in the power assembly is electrically connected to the electrical control cabinet 8.

[0043] During specific implementation, the conveyor belt can be a chain belt or a mesh belt.

[0044] In some other embodiments, the blocking mechanism 5 includes an infrared sensor 51, a driving cylinder 52 and a blocking rod 53. The infrared sensor 51, the driving cylinder 52 and the blocking rod 53 are all arranged on the adjustment seat, and the infrared sensor is close to the upstream of the conveying, and has a certain spacing distance from the blocking rod. The infrared sensor 51 and the driving cylinder 52 are respectively connected to the electric control cabinet 8 by electrical signals. The adjustment seat is connected to the frame 1 with an adjustable position through a screw adjustment mechanism. The infrared sensor 51 is arranged toward one side of the conveying mechanism and is used to detect the passing state of the battery shell. One end of the driving cylinder 52 and one end of the blocking rod 53 are staggered and hinged on the adjustment seat. The other end of the driving cylinder 52 is hinged to the middle area of ​​the blocking rod 53 and controls the rotation angle of the blocking rod. The blocking rod is a bending rod, and the other end of the blocking rod 53 can be rotated to be located above the conveying mechanism 2 and block the battery shell thereon. When the battery can be limited in position, the integrated punching and deburring mechanism can be positioned and operated.

[0045] In some other specific embodiments, the integrated punching and deburring mechanism 7 includes a three-axis servo manipulator 71, a distance rod seat 72, a nail hole assembly 73 and a burr removal assembly 74. The fixed end of the three-axis servo manipulator 71 is fixed to one side of the frame 1, and the distance rod seat 72 is fixed to the free end of the three-axis servo manipulator 71; the nail hole assembly 73 is the punching end and is fixed to one end of the distance rod seat 72; the burr removal assembly 74 is the deburring end and is fixed to the other end of the distance rod seat 72, and the three-axis servo manipulator 71, the nail hole assembly 73 and the burr removal assembly 74 are respectively connected to the electrical control cabinet 8 with electrical signals.

[0046] The length dimension of the distance rod seat 72 is greater than the length dimension of the battery shell, and the length direction of the distance rod seat 72 corresponds to the processing moving direction of the battery shell, so that the burr removal component can track the battery shell of the previous punching action.

[0047] In some other embodiments, the nail hole assembly 73 is used to open holes on the battery shell partition, and the burr removal assembly 74 is used to track and remove burrs remaining on the holes of the previous battery shell. That is to say, two groups of battery shells (upstream and downstream) on the conveying mechanism can be processed by the nail hole assembly and the burr removal assembly at the same time.

[0048] Specifically, the nail hole assembly 73 includes a base 731, a telescopic cylinder 732, a driving arm 733, a positioning clamp seat 734 and a punching head 735. The base 731 is a right-angle seat, which is fixed to one end edge of the distance rod seat 72. The telescopic cylinder 732 is fixed to the top of the base 731 and is electrically connected to the electric control cabinet 8. The positioning clamp seat 734 is fixed to the side end of the base 731. The driving arm 733 is a bending arm. One end of the driving arm 733 is hinged to the telescopic rod of the telescopic cylinder 732, and the other end edge is hinged to the positioning clamp seat 734. The punching head 735 is vertically (corresponding to the swing direction of the driving arm) fixed to the other end of the driving arm 733. The positioning clamp seat 734 is provided with a avoidance slot through which the avoidance punching head passes. The punching head is a cylindrical head or an elliptical cylindrical head to achieve target punching.

[0049] The bottom end of the positioning clamp seat 734 is provided with a groove for the partition to enter. The two ends of the groove pass through the two side ends of the positioning clamp seat 734 respectively, and the avoidance groove hole passes through the two wall surfaces of the groove. The groove can locate the position of the partition to facilitate stable drilling of the punching head.

[0050] The bottom end of the groove corresponding to the positioning clamp seat 734 is provided with a slope surface for facilitating the introduction of the battery shell partition, so as to reduce the influence of the error of the manipulator and ensure that the battery shell partition is smoothly introduced into the groove and waits for drilling.

[0051] More specifically, the burr removal assembly 74 includes an air pump 741, an air duct 742, a heater 743 and a hot air blowpipe 744. The air pump 741 is fixed on the frame 1 and is electrically connected to the electric control cabinet 8. One end of the air duct 742 is connected to the air outlet of the air pump 741, and the other end of the air duct 742 is connected to the hot air blowpipe 744. The heater 743 is fixed to the other end of the distance rod seat 72 and is electrically connected to the electric control cabinet. The hot air blowpipe 744 is fixed on the heater 743. The air in the air duct 742 is heated by the heater and blown out by the hot air blowpipe to remove the burrs remaining on the hole. The principle of deburring is thermal deburring. Since the battery shell is made of plastic, burrs remain on the edge of the hole after punching, and high-temperature wind is used to remove the burrs.

[0052] The hot air blowing pipe 744 is a heat-resistant hard pipe, and the bottom end of the hot air blowing pipe 744 is provided with a blowing port facing the hole of the battery shell partition. In specific implementation, the blowing port faces the direction of the hole.

[0053] Working process:

[0054] The battery shell enters the conveying mechanism from the upstream product conveying line. The position of the battery shell is first detected by the blocking mechanism on one side, and then the battery shell is blocked by the blocking rod on it. It should be noted that the punching station corresponds to the blocking position on one side, and the deburring station corresponds to the blocking position on the other side. After reaching the punching station, the conveying mechanism will stop conveying, and the machine head formed by the distance rod seat, nail hole assembly, and burr removal assembly will descend to perform the punching action and punch. After the punching is completed, the blocking mechanism on this side releases the restriction, and the battery shell moves downstream. After the infrared sensor of the blocking mechanism on the other side detects the battery shell, The electric control cabinet controls the stopping mechanism on this side to stop the battery shell, thereby corresponding to the burr removal station, and the burr removal component blows out hot air to remove the burrs. It should be noted that when the burr removal component is removing burrs, the nail hole component simultaneously performs a punching action on the upstream product. The burr removal component traces the burrs remaining on the hole position of the previous battery shell, so that one process flow can complete the punching and deburring work, and then the processed battery shell is transported to the downstream product conveyor line by the conveying mechanism. The present invention integrates punching and burr removal. Compared with manual burr removal, it has high efficiency and efficient production and processing.

[0055] As for the device and the method of use disclosed in the embodiment, since they correspond to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0056] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery tank punching integrated device, characterized in that: include: A frame (1), wherein a conveying mechanism (2) is arranged on the frame (1), and an upstream product conveying line (3) and a downstream product conveying line (4) connected to the conveying mechanism (2) are respectively arranged at two ends of the frame (1); A blocking mechanism (5), wherein the blocking mechanism (5) has two groups and is staggeredly arranged on both sides of the frame (1) corresponding to the conveying mechanism (2), and the blocking mechanism (5) is movably provided with a blocking rod (53) for blocking the movement of the battery housing (6), and the blocking mechanisms (5) on both sides can stop two groups of battery housings; An integrated punching and deburring mechanism (7), the integrated punching and deburring mechanism (7) being connected to the frame (1) and being located above the conveying mechanism (2), the integrated punching and deburring mechanism (7) being provided with a punching end and a deburring end at intervals, the punching end and the deburring end being capable of processing two groups of battery shells on the conveying mechanism at the same time; An electric control cabinet (8), the electric control cabinet (8) is arranged on one side of the frame (1), and the electric control cabinet (8) is electrically connected to the conveying mechanism (2), the blocking mechanism (5) and the integrated punching and deburring mechanism (7).

2. The battery slot punching integrated device according to claim 1, characterized in that: The two ends of the frame (1) corresponding to the conveying mechanism (2) are fixedly connected with a protective grille (9), and the protective grille (9) is provided with an escape opening (10) through which the escape battery housing (6) passes.

3. The battery slot punching integrated device according to claim 1, characterized in that: The conveying mechanism (2) comprises a conveyor belt (21), a guide plate (22) and a power assembly. The guide plates (22) are provided in two groups and are arranged in parallel and spaced apart on the frame (1). The conveyor belt (21) is rotatably connected to the frame (1) and is located between the two groups of guide plates (22). The power assembly is arranged on the frame and is transmission-connected to the conveyor belt (21). The servo motor in the power assembly is connected to the electric control cabinet (8) by electrical signals.

4. The battery slot punching integrated device according to claim 1, characterized in that: The blocking mechanism (5) comprises an infrared sensor (51), a driving cylinder (52) and a blocking rod (53). The infrared sensor (51), the driving cylinder (52) and the blocking rod (53) are all arranged on an adjustment seat. The infrared sensor (51) and the driving cylinder (52) are respectively connected to the electric control cabinet (8) by electrical signals. The adjustment seat is connected to the frame (1) in an adjustable position through a screw adjustment mechanism. The infrared sensor (51) is arranged toward one side of the conveying mechanism and is used to detect the passing state of the battery shell. One end of the driving cylinder (52) and one end of the blocking rod (53) are staggered and hinged on the adjustment seat. The other end of the driving cylinder (52) is hinged to the middle area of ​​the blocking rod (53) and controls the rotation angle of the blocking rod. The other end of the blocking rod (53) can be rotated to be located above the conveying mechanism (2) and block the battery shell thereon.

5. The battery slot punching integrated device according to claim 1, characterized in that: The punching and deburring integrated mechanism (7) comprises a three-axis servo manipulator (71), a distance rod seat (72), a nail hole assembly (73) and a burr removal assembly (74); the fixed end of the three-axis servo manipulator (71) is fixed to one side of the frame (1), and the distance rod seat (72) is fixed to the free end of the three-axis servo manipulator (71); the nail hole assembly (73) is a punching end and is fixed to one end of the distance rod seat (72); the burr removal assembly (74) is a deburring end and is fixed to the other end of the distance rod seat (72); the three-axis servo manipulator (71), the nail hole assembly (73) and the burr removal assembly (74) are respectively connected to an electric control cabinet (8) by electrical signals.

6. The battery slot punching integrated device according to claim 5, characterized in that: The nail hole assembly (73) is used for opening holes on the battery housing partition, and the burr removal assembly (74) is used for tracing and removing burrs remaining on the hole of the previous battery housing.

7. The battery slot punching integrated device according to claim 6, characterized in that: The nail hole assembly (73) comprises a base (731), a telescopic cylinder (732), a driving arm (733), a positioning clamp seat (734) and a punching head (735). The base (731) is a right-angle seat. The base (731) is fixed to one end edge of the distance rod seat (72). The telescopic cylinder (732) is fixed to the top of the base (731) and is connected to the electric control cabinet (8) for electrical signals. The positioning clamp seat (734) is fixed to the side end of the base (731). The driving arm (733) is a bending arm. One end of the driving arm (733) is hinged to the telescopic rod of the telescopic cylinder (732), and the other end edge is hinged to the positioning clamp seat (734). The punching head (735) is vertically fixed to the other end of the driving arm (733). The positioning clamp seat (734) is provided with a avoidance slot through which the avoidance punching head passes.

8. The battery slot punching integrated device according to claim 6, characterized in that: The burr removal component (74) comprises an air pump (741), an air duct (742), a heater (743) and a hot air blowpipe (744); the air pump (741) is fixed on the frame (1) and is electrically connected to the electric control cabinet (8); one end of the air duct (742) is connected to the air outlet of the air pump (741); the other end of the air duct (742) is connected to the hot air blowpipe (744); the heater (743) is fixed to the other end of the distance rod seat (72) and is electrically connected to the electric control cabinet; the hot air blowpipe (744) is fixed to the heater (743); the air in the air duct (742) is heated by the heater and then blown out by the hot air blowpipe to remove the burrs remaining on the hole.

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