A stainless steel pipe lead sheath extrusion device

Abstract

This invention relates to an extrusion device for lead sheathing of stainless steel pipes, belonging to the technical field of metal processing equipment. It addresses the problems of complex structure, inconvenient operation, poor shaping effect, and unstable extrusion process in existing stainless steel pipe lead sheathing extrusion equipment. A shaping unit is horizontally positioned along the length of the base plate at the middle of the right end of the upper surface of the base plate. A heating unit is vertically positioned at the middle of the upper surface of the shaping unit, with its lower end connected to the upper end of the shaping unit. An extrusion unit is horizontally positioned along the length of the base plate at the middle of the left end of the upper surface of the base plate. The extrusion unit and the shaping unit are configured and used in conjunction. This invention achieves integrated operation of heating, melting, shaping, and extruding the lead sheath of stainless steel pipes, with a compact structure and convenient operation. It allows for precise temperature control, enabling rapid and uniform shaping of the lead sheath, improving shaping quality. The extrusion unit drives the extrusion ring to extrude the shaped lead sheath; the movement process is stable and reliable, ensuring the extrusion quality of the lead sheath.

Description

Technical Field

[0001] This utility model belongs to the technical field of metal processing equipment, and in particular relates to an extrusion device for lead sheathing of stainless steel pipes. Background Technology

[0002] In the application of stainless steel pipes, lead sheaths are often installed to enhance certain specific properties, such as radiation protection and corrosion resistance. Currently, existing stainless steel pipe lead sheath extrusion equipment suffers from problems such as complex structure, inconvenient operation, poor shaping effect, and unstable extrusion process. This results in inconsistent quality of the produced stainless steel pipes with lead sheaths, failing to meet the requirements of some applications with high quality demands. Therefore, developing a stainless steel pipe lead sheath extrusion device with a reasonable structure, simple operation, and good shaping and extrusion effect is of significant practical importance. Summary of the Invention

[0003] The purpose of this invention is to provide a stainless steel pipe lead sheath extrusion device to solve the problems of complex structure, inconvenient operation, poor shaping effect and unstable extrusion process of existing stainless steel pipe lead sheath extrusion equipment.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A stainless steel pipe lead sheath extrusion device includes a base plate, a heating unit, a shaping unit, and an extrusion unit. The shaping unit is horizontally arranged along the length direction of the base plate at the middle of the right end of the upper surface of the base plate. The heating unit is vertically arranged at the middle of the upper surface of the shaping unit. The lower end of the heating unit is connected to the upper end of the shaping unit. The extrusion unit is horizontally arranged along the length direction of the base plate at the middle of the left end of the upper surface of the base plate. The extrusion unit and the shaping unit are configured and used in conjunction.

[0005] Furthermore, the shaping unit includes a shaping cylinder, a condenser tube, a second temperature sensor, and two sealing side covers. The shaping cylinder is horizontally positioned at the middle right end of the upper surface of the base plate via a U-shaped frame. A shaping cavity is provided inside the side wall of the shaping cylinder, and a discharge hole is opened on the shaping cylinder, which is connected to the shaping cavity inside the side wall of the shaping cylinder. A condenser tube is spirally arranged on the inner wall of the shaping cylinder, and the input and output ends of the condenser tube are respectively connected to the corresponding ports of the condensation system. A second temperature sensor is provided inside the shaping cylinder, and the second temperature sensor is connected to the temperature control system. The two sealing side covers are detachably and sealingly installed at the left and right ends of the shaping cylinder. During the shaping stage, the two sealing side covers are sealed at the left and right ends of the shaping cylinder. During the extrusion stage after shaping, the two sealing side covers are removed from the left and right ends of the shaping cylinder, and the shaped lead sheath in the shaping cavity is extruded through the extrusion unit.

[0006] Furthermore, the heating unit includes a hot aluminum barrel, a heating wire, and a temperature sensor. The hot aluminum barrel is vertically arranged in the middle of the upper end face of the shaping cylinder. The upper end face of the hot aluminum barrel is provided with a feeding hole, and the middle of the lower end face of the hot aluminum barrel is provided with a discharge hole. The discharge hole is connected to the discharge hole on the shaping cylinder. The heating wire is spirally arranged on the inner wall of the hot aluminum barrel, and a temperature sensor is provided inside the hot aluminum barrel. The temperature sensor is connected to the temperature control system signal.

[0007] Furthermore, a groove is provided at the middle of the left end of the upper surface of the base plate along the length of the base plate. The groove is configured and used in conjunction with the extrusion unit. The extrusion unit includes a telescopic motor, a telescopic rod, a slide plate, a mounting frame, an extrusion ring, a limiting ring, and multiple push rods. The telescopic motor is located on the upper surface of the base plate and at the left end of the groove. The slide plate is vertically arranged in the groove along the width of the base plate, and its lower end is slidably connected to the groove. The output end of the telescopic motor is fixedly connected to one end of the horizontally arranged telescopic rod, and the other end of the telescopic rod is fixedly connected to the left end face of the slide plate. The mounting frame is vertically arranged on the upper surface of the base plate along the width of the base plate and at the right end of the groove. The limiting ring... The extrusion ring is vertically mounted on the mounting frame along the width of the base plate. The limiting ring has multiple through holes, which are matched and used in conjunction with multiple push rods. The extrusion ring is vertically mounted above the base plate and located to the right of the limiting ring along the width of the base plate. Multiple push rods are horizontally mounted above the base plate and located between the slide plate and the extrusion ring. One end of the push rod is fixedly connected to the right end face of the slide plate, and the other end of the push rod slides horizontally through the corresponding through hole on the limiting ring and is fixedly connected to the left end face of the extrusion ring. The extrusion ring is matched and used in conjunction with the shaping cavity of the shaping cylinder. In use, the extrusion ring extends into one end of the shaping cavity and extrudes the shaped lead sheath from the other end of the shaping cavity.

[0008] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model achieves integrated operation of heating, melting, shaping and extruding of stainless steel pipe lead sheath by setting up a heating unit, a shaping unit and an extrusion unit. It has a compact structure and is easy to operate.

[0009] 2. The condenser and temperature sensor II in the shaping unit of this utility model can accurately control the temperature inside the shaping cylinder, enabling the lead sheath to be shaped quickly and evenly, thus improving the shaping quality of the lead sheath.

[0010] 3. The extrusion unit of this utility model uses a telescopic motor to drive the slide plate and push rod to move, which in turn drives the extrusion ring to extrude the shaped lead sheath. The movement process is stable and reliable, which can ensure the extrusion quality of the lead sheath.

[0011] 4. The connections between the components of the entire device of this utility model are clear, the positions are reasonably arranged, which facilitates installation, debugging and maintenance, and reduces production and usage costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the overall structure of this utility model. Figure 3 ; Figure 4 This is a side view of the present invention; Figure 5 This is a cross-sectional view of the heating unit; Figure 6 This is a sectional view of the standardized unit.

[0013] The component names and reference numerals in the above figures are as follows: 1. Base plate; 2. Shaping cylinder; 3. Hot aluminum barrel; 4. U-shaped frame; 5. Sealed side cover; 6. Feed hole; 7. Telescopic motor; 8. Telescopic rod; 9. Slide groove; 10. Slide plate; 11. Push rod; 12. Mounting bracket; 13. Extrusion ring; 14. Limiting ring; 15. Heating wire; 16. Discharge hole; 17. Temperature sensor one; 18. Shaping cavity; 19. Discharge hole; 20. Condenser; 21. Temperature sensor two. Detailed Implementation

[0014] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0015] Detailed implementation methods: such as Figures 1-6 As shown in the figure, this embodiment discloses a stainless steel pipe lead sheath extrusion device, including a base plate 1, a heating unit, a shaping unit, and an extrusion unit. The base plate 1 provides a stable support foundation for the entire device. Its material is a high-strength metal material, such as stainless steel, to ensure sufficient rigidity and stability during device operation. The shaping unit is horizontally arranged along the length of the base plate 1 at the middle of the right end of the upper surface of the base plate 1. The heating unit is vertically arranged at the middle of the upper surface of the shaping unit. The lower end of the heating unit is connected to the upper end of the shaping unit. The extrusion unit is horizontally arranged along the length of the base plate 1 at the middle of the left end of the upper surface of the base plate 1. The extrusion unit and the shaping unit are arranged and used in conjunction.

[0016] Furthermore, the shaping unit includes a shaping cylinder 2, a condenser tube 20, a temperature sensor 21, and two sealing side covers 5. The shaping cylinder 2 is horizontally positioned at the middle right end of the upper surface of the base plate 1 via a U-shaped frame 4. The U-shaped frame 4 serves to stably support the shaping cylinder 2 and is also made of stainless steel. A shaping cavity 18 is provided inside the side wall of the shaping cylinder 2. The shape and size of the shaping cavity 18 are designed according to the specifications of the stainless steel tube and the required lead sheath. A feeding hole 19 is opened on the shaping cylinder 2 and is connected to the shaping cavity 18 inside the side wall of the shaping cylinder 2. It is used to introduce the heated lead material into the shaping cavity 18. A condenser tube 20 is spirally arranged on the inner wall of the shaping cylinder 2. The condenser tube 20 is made of copper tube and has good thermal conductivity. The input and output ends of the condenser tube 20 are respectively connected to the corresponding ports of the condensation system. The condensation system uses a circulating cooling medium (such as cooling water) to flow in the condenser tube 20, carrying away the heat in the shaping cylinder 2, so that the lead material entering the shaping cavity 18 can be quickly cooled and shaped. The shaping cylinder 2 is equipped with a second temperature sensor 21, which is connected to the temperature control system. The second temperature sensor 21 monitors the temperature in the shaping cylinder 2 in real time and transmits the temperature signal to the temperature control system. The temperature control system controls the operation of the condensation system according to the preset temperature value to ensure that the temperature in the shaping cylinder 2 is kept within a suitable range to ensure the shaping quality of the lead sheath. Two sealing side covers 5 are detachably sealed at the left and right ends of the shaping cylinder 2. During the shaping stage, the two sealing side covers 5 are sealed at the left and right ends of the shaping cylinder 2 to prevent lead material leakage. During the extrusion stage after shaping, the two sealing side covers 5 are removed from the left and right ends of the shaping cylinder 2, and the shaped lead sheath is extruded from the shaping cavity 18 through the extrusion unit. The sealing side covers 5 and the shaping cylinder 2 are detachably sealed by means of threaded connection or snap-fit ​​connection.

[0017] Furthermore, the heating unit includes a hot aluminum barrel 3, a heating wire 15, and a temperature sensor 17. The hot aluminum barrel 3 is vertically arranged in the middle of the upper end face of the shaping cylinder 2. The hot aluminum barrel 3 is made of aluminum alloy, which has good thermal conductivity and corrosion resistance. The upper end face of the hot aluminum barrel 3 is provided with a feed hole 6 for adding lead material into the hot aluminum barrel 3. The lower end face of the hot aluminum barrel 3 is provided with a discharge hole 16, which is connected to the discharge hole 19 on the shaping cylinder 2, so that the heated and melted lead material can flow smoothly into the shaping cavity 18 of the shaping cylinder 2. The inner wall of the hot aluminum barrel 3 is spirally provided with a heating wire 15. When the heating wire 15 is energized, it generates heat to heat and melt the lead material in the hot aluminum barrel 3. The heating wire 15 is made of nickel-chromium alloy wire, which has high resistivity and good high temperature resistance. A temperature sensor 17 is installed inside the hot aluminum barrel 3. The temperature sensor 17 is connected to the temperature control system. The temperature sensor 17 can monitor the temperature inside the hot aluminum barrel 3 in real time and transmit the temperature signal to the temperature control system. The temperature control system controls the power supply and de-energization of the heating wire 15 according to the preset temperature value to ensure that the temperature inside the hot aluminum barrel 3 is kept within the melting temperature range of the lead material, so that the lead material can be fully melted.

[0018] Furthermore, a groove 9 is provided at the middle of the left end of the upper surface of the base plate 1 along the length of the base plate 1. The groove 9 is configured and used in conjunction with the extrusion unit to guide the movement direction of the extrusion unit. The extrusion unit includes a telescopic motor 7, a telescopic rod 8, a slide plate 10, a mounting frame 12, an extrusion ring 13, a limiting ring 14, and multiple push rods 11. The telescopic motor 7 is set on the upper surface of the base plate 1 and located at the left end of the groove 9. The telescopic motor 7 provides power to the entire extrusion unit. It is a servo motor to ensure the accuracy and stability of the movement. The slide plate 10 is vertically set in the groove 9 along the width direction of the base plate 1. The lower end of the slide plate 10 is slidably connected to the groove 9, so that the slide plate 10 can move linearly along the length direction of the base plate 1 within the groove 9. The output end of the telescopic motor 7 is fixedly connected to one end of the horizontally set telescopic rod 8, and the other end of the telescopic rod 8 is fixedly connected to the left end face of the slide plate 10. When the telescopic motor 7 is started, it drives the telescopic rod 8 to extend and retract, thereby pushing the slide plate 10 to move within the groove 9. The mounting frame 12 is vertically set in the base plate along the width direction of the base plate 1. On the upper surface of the base plate 1 and located at the right end of the chute 9, a limiting ring 14 is vertically mounted on the mounting bracket 12 along the width direction of the base plate 1. The limiting ring 14 has multiple through holes, each corresponding to and engaging with multiple push rods 11. The function of the limiting ring 14 is to restrict the movement direction of the push rods 11, ensuring they can only move in a straight line horizontally, thus guaranteeing the stability of the extrusion process. An extrusion ring 13 is vertically mounted above the base plate 1 and to the right of the limiting ring 14, along the width direction of the base plate 1. All push rods 11 are horizontally mounted... The push rod 11 is placed above the base plate 1 and between the slide plate 10 and the extrusion ring 13. One end of the push rod 11 is fixedly connected to the right end face of the slide plate 10, and the other end of the push rod 11 slides horizontally through the corresponding through hole on the limiting ring 14 and is fixedly connected to the left end face of the extrusion ring 13. The push rod 11 is made of high-strength metal material, such as stainless steel. The extrusion ring 13 is set and used in conjunction with the shaping cavity 18 of the shaping cylinder 2. When in use, the extrusion ring 13 extends into one end of the shaping cavity 18 and extrudes the shaped lead sheath from the other end of the shaping cavity 18.

[0019] I. Working Principle: The working principle of the stainless steel pipe lead sheath extrusion device of this utility model is as follows: Heating and melting stage: Lead material is added into the hot aluminum barrel 3 through the feed hole 6. The heating wire 15 is energized to generate heat, which melts the lead material in the hot aluminum barrel 3. Temperature sensor 17 monitors the temperature inside the hot aluminum barrel 3 in real time and transmits the temperature signal to the temperature control system. The temperature control system controls the energization and de-energization of the heating wire 15 according to the preset temperature value to ensure that the lead material is fully melted at the appropriate temperature.

[0020] Shaping Stage: The molten lead material flows into the shaping cavity 18 of the shaping cylinder 2 through the discharge hole 16 on the lower end face of the hot aluminum barrel 3 and the discharge hole 19 on the shaping cylinder 2. At this time, two sealing side covers 5 are sealed at the left and right ends of the shaping cylinder 2 to prevent lead material leakage. The cooling medium in the condenser pipe 20 circulates, carrying away the heat in the shaping cylinder 2, so that the lead material is rapidly cooled and shaped in the shaping cavity 18. Temperature sensor 21 monitors the temperature in the shaping cylinder 2 in real time and transmits the temperature signal to the temperature control system. The temperature control system controls the operation of the condensation system according to the preset temperature value to ensure that the temperature in the shaping cylinder 2 is maintained within a suitable range to ensure the shaping quality of the lead sheath.

[0021] Extrusion Stage: After the lead sheath has been shaped in the shaping cavity 18, the two sealing side covers 5 are removed from the left and right ends of the shaping cylinder 2. The telescopic motor 7 is started, which drives the telescopic rod 8 to extend and retract, thereby pushing the slide plate 10 to move to the right in the slide groove 9. The slide plate 10 drives the extrusion ring 13 to move to the right through the push rod 11, so that the extrusion ring 13 extends into one end of the shaping cavity 18, extruding the shaped lead sheath from the other end of the shaping cavity 18. The limiting ring 14 restricts the movement direction of the push rod 11, so that it can only move in a straight line in the horizontal direction, ensuring the stability of the extrusion process.

[0022] II. Work Process: Equipment Preparation: Check that all components of the device are securely installed and that connections are normal. Add an appropriate amount of cooling medium to the condensation system and ensure that the condensation system is operating normally. Set the temperature control system to appropriate temperature parameters, corresponding to the melting temperature of the lead material in the hot aluminum bucket 3 and the shaping temperature of the lead sheath in the shaping cylinder 2, respectively.

[0023] Add lead material: Slowly add lead material into hot aluminum barrel 3 through the feed hole 6 on hot aluminum barrel 3.

[0024] Heating and melting: The heating wire 15 is activated to heat and melt the lead material in the hot aluminum bucket 3. At the same time, the temperature displayed by the temperature sensor 17 is observed. When the temperature reaches the preset melting temperature, the temperature control system automatically controls the heating wire 15 to maintain a constant temperature, so that the lead material is fully melted.

[0025] Lead material flows into the shaping cavity 18: The molten lead material flows into the shaping cavity 18 of the shaping cylinder 2 through the discharge hole 16 on the lower end face of the hot aluminum barrel 3 and the discharge hole 19 on the shaping cylinder 2. At this time, ensure that the two sealing side covers 5 are sealed and installed at the left and right ends of the shaping cylinder 2.

[0026] Lead sheath shaping: The condensation system is activated, and the cooling medium circulates within the condenser tube 20 to cool the shaping cylinder 2. The temperature displayed by the temperature sensor 21 is observed. When the temperature reaches the preset shaping temperature, the temperature control system automatically controls the operation of the condensation system to maintain the temperature within the shaping cylinder 2 within a suitable shaping temperature range, and the lead material gradually cools and shapes within the shaping cavity 18.

[0027] Remove the sealing side cover 5: After the lead sheath has been shaped in the shaping cavity 18, turn off the condensation system. Use tools to remove the two sealing side covers 5 from the left and right ends of the shaping cylinder 2.

[0028] Extruding the lead sheath: Start the telescopic motor 7, which drives the telescopic rod 8 to extend and retract, pushing the slide plate 10 to the right within the groove 9. The slide plate 10, through the push rod 11, drives the extrusion ring 13 to the right, causing the extrusion ring 13 to extend into one end of the shaping cavity 18, extruding the shaped lead sheath from the other end of the shaping cavity 18. During the extrusion process, observe the extrusion of the lead sheath to ensure that the extrusion process is stable and smooth.

[0029] Equipment Cleaning: After the lead sheath is extruded, turn off the telescopic motor 7. Clean the equipment, removing any residual lead material in the hot aluminum barrel 3 and any impurities that may be present in the shaping cylinder 2. Restore the equipment to its initial state and position to prepare for the next production run.

[0030] The stainless steel pipe lead sheath extrusion device of this invention can effectively realize the heating, melting, shaping and extrusion of stainless steel pipe lead sheaths. It has a compact structure, is easy to operate, and improves the production quality and efficiency of lead sheaths.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stainless steel pipe lead sheath extrusion device, characterized in that: It includes a base plate (1), a heating unit, a shaping unit and an extrusion unit. The shaping unit is horizontally arranged in the middle of the right end of the upper surface of the base plate (1) along the length direction of the base plate (1). The heating unit is vertically arranged in the middle of the upper surface of the shaping unit. The lower end of the heating unit is connected to the upper end of the shaping unit. The extrusion unit is horizontally arranged in the middle of the left end of the upper surface of the base plate (1) along the length direction of the base plate (1). The extrusion unit and the shaping unit are arranged and used together.

2. The stainless steel pipe lead sheath extrusion device according to claim 1, characterized in that: The shaping unit includes a shaping cylinder (2), a condenser tube (20), a second temperature sensor (21), and two sealing side covers (5). The shaping cylinder (2) is horizontally positioned at the middle right end of the upper surface of the base plate (1) via a U-shaped frame (4). A shaping cavity (18) is provided inside the side wall of the shaping cylinder (2). A feeding hole (19) is opened on the shaping cylinder (2), and the feeding hole (19) is connected to the shaping cavity (18) inside the side wall of the shaping cylinder (2). A condenser tube (20) is spirally arranged on the inner wall of the shaping cylinder (2). The input end and output end of the condenser tube (20) are connected to each other. The ends are respectively connected to the corresponding ports of the condensation system. The shaping cylinder (2) is equipped with a temperature sensor (21). The temperature sensor (21) is connected to the temperature control system. The two sealing side covers (5) are respectively detachably sealed at the left and right ends of the shaping cylinder (2). During the shaping stage, the two sealing side covers (5) are sealed at the left and right ends of the shaping cylinder (2). During the extrusion stage after shaping, the two sealing side covers (5) are removed from the left and right ends of the shaping cylinder (2), and the shaped lead sheath in the shaping cavity (18) is extruded through the extrusion unit.

3. The stainless steel pipe lead sheath extrusion device according to claim 2, characterized in that: The heating unit includes a hot aluminum barrel (3), an electric heating wire (15), and a temperature sensor (17). The hot aluminum barrel (3) is vertically arranged in the middle of the upper end face of the shaping cylinder (2). The upper end face of the hot aluminum barrel (3) is provided with a feeding hole (6), and the middle of the lower end face of the hot aluminum barrel (3) is provided with a discharge hole (16). The discharge hole (16) is connected to the discharge hole (19) on the shaping cylinder (2). The inner wall of the hot aluminum barrel (3) is spirally provided with an electric heating wire (15). The hot aluminum barrel (3) is provided with a temperature sensor (17), and the temperature sensor (17) is connected to the temperature control system signal.

4. The stainless steel pipe lead sheath extrusion device according to claim 3, characterized in that: The upper left side of the base plate (1) is provided with a groove (9) along the length of the base plate (1). The groove (9) is configured and used in conjunction with the extrusion unit. The extrusion unit includes a telescopic motor (7), a telescopic rod (8), a slide plate (10), a mounting frame (12), an extrusion ring (13), a limiting ring (14), and multiple push rods (11). The telescopic motor (7) is set on the upper surface of the base plate (1) and located at the left end of the groove (9). The slide plate (10) is vertically set in the groove (9) along the width of the base plate (1). The lower end of the slide plate (10) is slidably connected to the groove (9). The output end of the telescopic motor (7) is fixedly connected to one end of the horizontally set telescopic rod (8). The other end of the telescopic rod (8) is fixedly connected to the left end of the slide plate (10). The mounting frame (12) is vertically set on the upper surface of the base plate (1) along the width of the base plate (1) and located at the right end of the groove (9). The limiting ring (14) is... The extrusion ring (13) is vertically set on the mounting frame (12) along the width direction of the base plate (1). The limiting ring (14) has multiple through holes, and the multiple through holes are matched and used in conjunction with multiple push rods (11). The extrusion ring (13) is vertically set above the base plate (1) and located to the right of the limiting ring (14) along the width direction of the base plate (1). The multiple push rods (11) are horizontally set above the base plate (1) and located between the slide plate (10) and the extrusion ring (13). One end of the push rod (11) is fixedly connected to the right end face of the slide plate (10), and the other end of the push rod (11) slides horizontally through the corresponding through hole on the limiting ring (14) and is fixedly connected to the left end face of the extrusion ring (13). The extrusion ring (13) is matched and used in conjunction with the shaping cavity (18) of the shaping cylinder (2). When in use, the extrusion ring (13) extends into one end of the shaping cavity (18) and extrudes the shaped lead sheath from the other end of the shaping cavity (18).

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