100results about "Rams/plungers" patented technology

The invention discloses an extrusion forming device for a photovoltaic aluminum profile frame, and particularly relates to the field of aluminum profile molding.The extrusion forming device comprises a base, a left supporting frame is fixedly connected to one side of the top of the base, an extruder is fixedly connected to the other side of the top of the base, and an extrusion head is arranged at the output end of the extruder; the side wall of the left supporting frame is connected with a mold through a locking mechanism, and an auxiliary mechanism for cleaning and oiling the extrusion head is arranged on one side of the locking mechanism. After the mold is replaced, in the process of controlling the mold to reset, the mold is synchronously fixed and limited through the fixed mold base, the mold replacement convenience is improved, meanwhile, a second threaded rod synchronously drives a connecting rod and an arc-shaped plate to rotate, cleaning of an extrusion head is completed, oil coating of the extrusion head is synchronously completed, and the mold replacement efficiency is improved. And the service lives of the fixed die holder and the extrusion head are prolonged.

The utility model relates to the technical field of aluminum extruders, and discloses an aluminum extruder cake-free extrusion prevention recognition device which comprises a base, a fixing disc is fixedly connected to the top of the right side of the base, a hydraulic cylinder is fixedly connected to the left side of the fixing disc, and the output end of the hydraulic cylinder is rotationally connected with a pushing column. Fixing plates are fixedly connected to the front end and the rear end of the top of the base, supporting rods are fixedly connected to the tops of the fixing plates, rolling shafts are fixedly connected to the tops of the supporting rods, the fixing plates are fixedly connected to the front ends of the rolling shafts at the front ends, and photoelectric sensors are fixedly connected to the rear ends of the fixing plates. According to the aluminum cake clamping device, the pushing column, the driven gear, the driving gear and other components move, finally, the clamping plate at one end of the movable plate is used for clamping an aluminum cake, the aluminum cake is accurately positioned and reliably clamped, it is guaranteed that the aluminum cake can be kept in a stable position state in the subsequent operation processes of pushing, machining and the like, and machining efficiency is improved. And the situation that the machining precision is affected by deviation, shaking and the like is avoided, and the machining quality can be improved.

The utility model discloses a hot extrusion forming device, which belongs to the technical field of extrusion forming and comprises a worktable, a protective box is mounted in the middle of the upper end of the worktable, a die holder is fixed in the protective box, a die cavity is arranged in the die holder, and two groups of through cavities are symmetrically arranged on two side walls of the protective box. The pushing fixing mechanism composed of the motor, the rotary disc, the extending frame, the electric suction cup and the three-jaw chuck is designed, in the material extrusion process, the rotary disc can be driven by the motor to rotate according to the shape of materials, then the three-jaw chuck and the electric suction cup are selected, the applicability of the device can be improved, and the production efficiency is improved. And then the materials are adsorbed and fixed through a three-jaw chuck or an electric suction cup, it can be guaranteed that the materials are evenly stressed in the extrusion process, deviation caused by the unstable center is avoided, the forming effect of the materials is guaranteed, and the use performance of the device is improved.

A dummy block for a metal extrusion press includes: a generally cylindrical base having a forward surface and an outwardly extending circumferential flange; an expandable collar coupled to the base, the collar having an inwardly extending circumferential rib abutting the circumferential flange; a plunger disc seated against the forward surface of the base and accommodated by the collar; and a plunger shaft extending through the plunger disc and coupled to the base.

The invention belongs to the technical field of extruders, and particularly relates to a novel double-layer extrusion rod structure which comprises a main oil cylinder, a piston bracket fixedly installed on a piston of the main oil cylinder through a bolt, a core rod installed in the middle of the other side of the piston bracket, and an inner sleeve rod arranged outside the core rod in a sleeving mode. The inner sleeve rod is fixedly connected with the piston bracket through a pressure pad and a bolt, an outer sleeve rod is sleeved outside the inner sleeve rod, a cross beam is sleeved on one side, close to the piston bracket, of the inner sleeve rod, a pressing sleeve is sleeved on one end, close to the cross beam, of the outer sleeve rod, the pressing sleeve is fixedly connected with the outer sleeve rod through a bolt, and the pressing sleeve is fixedly connected with the cross beam through a bolt. A plurality of auxiliary oil cylinders are distributed on the piston bracket, and pistons of the auxiliary oil cylinders are fixedly connected with the cross beam. In the process of extrusion production of the layered composite pipe or the composite rod, higher pressure can be independently applied to the outer-layer blank, so that the flowing speed of the outer-layer material can be matched with the flowing speed of the inner-layer material.

The present invention discloses a hot extrusion die for processing aluminum alloy heat dissipation pipes for refrigerators, and relates to the technical field of refrigerator heat dissipation pipe processing, including a base and a feeding assembly, wherein a limiting sleeve is arranged on the top of one end of the base, and a one-way bearing is arranged inside the limiting sleeve. The present invention first places a plurality of rod-shaped heat dissipation pipe blanks in a material guide frame, and at this time, since the width of the material guide frame is equal to the length of the rod-shaped blanks, the blanks can be neatly arranged inside the material guide frame, and the rod-shaped blanks at the end of the material guide frame can fall to the lower end of the limiting frame, and at this time, when the motor drives the screw to rotate, since the transmission rod will limit the rotation of the driving plate, the horizontal position of the driving plate can be controlled, and when the driving plate drives the ejector rod and the movable mold to hot extrude the heated blanks, the driving plate will simultaneously drive the feeding rod to move toward the limiting frame, so that the push plate moves the blanks inside the limiting frame to the cavity at the other end of the rotating seat.

The invention discloses a vacuum extrusion device for preparing titanium and titanium alloy, relates to the technical field of titanium and titanium alloy preparation, and aims at solving the problems that an existing device is prone to sealing failure, not thorough in cleaning and low in temperature control precision. The device comprises a vacuum chamber, an extrusion rod, an air passage system, an air source distributor, a temperature monitoring module and an external control module. The working section of the extrusion rod is provided with three sections of spiral grooves, and precise coupling of dynamic sealing, self-cleaning and temperature field regulation and control is achieved through cooperation of an air channel system and multiple air channels. The first section of main sealing spiral groove forms a high-pressure air curtain, the second section of temperature control spiral groove adjusts the temperature in a self-adaptive mode through a shape memory alloy ring, and the third section of cleaning spiral groove conducts deep cleaning through the reverse suction effect. And the external control module adaptively regulates and controls each gas path according to temperature and impurity concentration monitoring data, so that the structure is simplified, the efficiency is improved, the product quality stability is guaranteed, and the batch production requirements of high-quality titanium and titanium alloy are met.

The present disclosure provides a shear assisted extrusion press comprising a stem and plunger assembly comprising a main piston configured to generate an extrusion force, a stem assembly comprising a stem having a first end and a second end, wherein the second end connects to a rotary piston that connects to the stem and plunger assembly, wherein the main piston exerts the extrusion force on the stem such that the stem moves axially, and at least one piston motor coupled with the stem and configured to drive a rotational movement of the rotary piston and the stem, and a container assembly comprising a container holder, a container configured to receive a billet and the first end of the stem, and at least one hydraulic motor positioned in the container holder with the container, wherein the at least one hydraulic motor is configured to drive a rotational movement of the container.

A mold for preparing large-size rare earth magnesium alloy ingot without tail shrinkage by back pressure plastic deformation includes a male mold, a female mold, a recoverable discard block and a back pressure plate connected with a pushing cylinder of the press machine. The female mold is provided with an upper mold cavity and a lower mold cavity, an upper part of the upper mold cavity is configured for placing blanks, the recoverable discard block and the male mold, and a lower part of the upper mold cavity is inclined inward to form an extrusion deformation area. The recoverable discard block is configured to be deformed to fill an extrusion deformation area and subsequently restored into the initial state of the recoverable discard block.

The present invention relates to the technical field of door and window processing, and particularly relates to a profile extrusion forming device for intelligent door and window production, including a main base. A rotating frame is fixedly installed on the main base, and a rotating disk is rotatably installed on the rotating frame. A plurality of insertion slots evenly distributed along its circumferential direction are formed on the outer wall of the rotating disk, and a shaping module is inserted into each of the plurality of insertion slots. Symmetrically arranged moving tracks are formed at the bottom of the main base, and a plurality of evenly distributed positioning hydraulic cylinders are fixedly installed at the bottom of the main base. The telescopic ends of the plurality of positioning hydraulic cylinders are fixedly installed with positioning cogs. The present invention designs a shaping module, and the extrusion forming of profiles can be realized through the cooperation of a shaping inner core and a shaping sleeve. At the same time, the profiles can be continuously pressure-maintained and protected after extrusion forming, avoiding the deformation of the profiles during subsequent conveying or cooling, greatly improving the qualified rate of profile production, and reducing the production cost of intelligent doors and windows.

The utility model discloses a process device for eliminating tail shrinkage of an extruded bar, and relates to the technical field of bar production. The device comprises a base, a bar extruder is fixedly installed on the rear side of the upper end of the outer wall of the base, an extrusion shaft is arranged at the output end of the bar extruder, an extrusion cylinder is fixedly installed on the front side of the upper end of the outer wall of the base, an extrusion die is fixedly installed at the front end of the outer wall of the extrusion cylinder, and an extrusion shaft pad is fixedly installed at the front end of the outer wall of the extrusion shaft. A concave cavity is formed in the front end of the outer wall of the extrusion shaft pad, and a release agent spraying assembly capable of moving up and down is arranged on the outer wall of the extrusion cylinder. When the extrusion shaft drives the extrusion shaft pad to carry out extrusion forming on a blank, the concave cavity in the center of the extrusion shaft pad can be filled with materials in the extrusion process, so that enough metal can be used for supplementing shrinkage of the central part of a bar in the later stage of extrusion, a shrinkage cavity in the tail end of the bar is eliminated, waste is prevented from being produced, and the utilization rate of the materials is improved.

The present disclosure provides a shear assisted extrusion press comprising a stem and plunger assembly comprising a main piston configured to generate an extrusion force, a stem assembly comprising a stem having a first end and a second end, wherein the second end connects to a rotary piston that connects to the stem and plunger assembly, wherein the main piston exerts the extrusion force on the stem such that the stem moves axially, and at least one piston motor coupled with the stem and configured to drive a rotational movement of the rotary piston and the stem, and a container assembly comprising a container holder, a container configured to receive a billet and the first end of the stem, and at least one hydraulic motor positioned in the container holder with the container, wherein the at least one hydraulic motor is configured to drive a rotational movement of the container. The rotary piston and the stem are configured to rotate and move axially such that the stem moves the billet through the container to extrude a part, and the container and the billet are configured to rotate together while the container does not move axially.

The L-shaped extrusion die comprises an extrusion part and a mounting plate connected through a guide column arranged at the top of the extrusion part, a plurality of first pushing devices are evenly arranged at the bottom of the mounting plate in the circumferential direction in an array mode, the output ends of the first pushing devices are connected with a pressing plate, and the guide column penetrates through the pressing plate. The bottom of the pressing plate is connected with a male die assembly with the cylindrical upper half portion and the truncated-cone-shaped lower half portion. An extrusion cavity matched with the male die assembly in shape is formed in the extrusion part under the male die assembly, a mounting groove is formed in the bottom of the extrusion part from the side wall to the bottom of the extrusion cavity, and the cylindrical female die is clamped in the mounting groove through peripheral flanges; a through L-shaped discharging opening is formed in the center of the female die and right faces the center of the bottom of the extrusion cavity, and the inner diameter of the discharging opening is gradually reduced from top to bottom. Through multi-stage extrusion and pushing of the device, the uniform wall thickness of a finished product can be effectively ensured, bumps in the product are avoided, and defective products are reduced; meanwhile, the female die can be replaced in time, and product quality is improved.

The invention provides hot extrusion forming equipment for I-shaped aluminum alloy profile production, and relates to the technical field of aluminum alloy forming machining. The hot extrusion forming equipment for I-shaped aluminum alloy profile production comprises an extrusion cylinder, a separation type extrusion rod is arranged on the rear side of the extrusion cylinder, the separation type extrusion rod is installed on a hydraulic driving part, a heat preservation end is rotationally connected to the front side of the extrusion cylinder, and a discharging cylinder is rotationally connected to the front side of the heat preservation end. A flow storage box is installed at the position, close to the rear side, of the outer side wall of the discharging barrel, an extrusion mold is installed in the outer side wall of the discharging barrel, and a trimming and pressurizing assembly is installed on the outer side wall of the extrusion mold. The problem of poor combination of continuous forming of the two sections of aluminum blanks is solved, and extrusion force in the radial direction and the axial direction is applied to the combination position of the two sections of aluminum blanks through the separated extrusion rod and the hammering assembly, so that the strength of the combination position of the two sections of aluminum blanks is obviously improved.

Shear-assisted extrusion assemblies are provided. The assemblies can include a billet containing assembly containing a billet comprising a billet outer material and a billet inner material in at least one cross-section; a tool operably engaged with the billet; an extrudate receiving channel configured to receive extrudate from the tool, wherein the extrudate comprises extruded outer material and extruded inner material in at least one cross-section, the extruded outer material being the same material as the billet outer material, and the extruded inner material being the same as the billet inner material. Methods for producing multi-material shear-assisted extrudate are also provided.

The present disclosure provides a shear assisted extrusion press comprising a stem and plunger assembly comprising a main piston configured to generate an extrusion force, a stem assembly comprising a stem having a first end and a second end, wherein the second end connects to a rotary piston, wherein the main piston exerts the axial extrusion force on the stem, and at least one piston motor to drive a rotational movement of the rotary piston and the stem, and a container assembly comprising a container holder, a container configured to receive a billet and the first end of the stem, and at least one hydraulic motor positioned in the container holder with the container configured to drive a rotational movement of the container. The rotary piston and the stem are configured to rotate and move axially such that the stem moves the billet through the container to extrude a part, and the container and the billet are configured to rotate together.

An extrusion device includes an extrusion chamber, a die assembly having an internal cavity in communication with the extrusion chamber, and a dummy block configured to push a billet of material from the extrusion chamber through the internal cavity of the die assembly to form an extruded profile, a surface of the dummy block in contact with the billet of material being a non-uniform surface.

The present disclosure provides a shear assisted extrusion press comprising a stem and plunger assembly comprising a main piston configured to generate an extrusion force, a stem assembly comprising a stem having a first end and a second end, wherein the second end connects to a rotary piston that connects to the stem and plunger assembly, wherein the main piston exerts the extrusion force on the stem such that the stem moves axially, and at least one piston motor coupled with the stem and configured to drive a rotational movement of the rotary piston and the stem, and a container assembly comprising a container holder, a container configured to receive a billet and the first end of the stem, and at least one hydraulic motor positioned in the container holder with the container, wherein the at least one hydraulic motor is configured to drive a rotational movement of the container.

The utility model discloses a material ejecting device for aluminum bar hot shearing. The material ejecting device comprises an extruding machine cross beam, a movable extruding base structure, an extruding base upper sliding block, an extruding base lower sliding block, a movable push rod, a transmission rack, a transmission gear and a transmission motor. The movable extrusion seat structure is arranged on one side of the extruder cross beam; the extrusion seat upper sliding block and the extrusion seat lower sliding block are respectively arranged at the upper part and the lower part of the movable extrusion seat structure; the movable push rod is horizontally arranged on one side of the movable extrusion seat structure, the transmission rack is fixed to the movable push rod in the length direction of the movable push rod, the power output end of the transmission motor is sleeved with the transmission gear, and the transmission gear is meshed with the transmission rack; and under the driving of the transmission motor, the movable extrusion seat structure horizontally slides in the length directions of the extrusion seat upper sliding block and the extrusion seat lower sliding block. High-precision transmission of gear and rack meshing transmission is adopted to replace an original oil cylinder transmission mode, and the production line adaptability of the aluminum profile extruding machine is improved.

The application provides an aluminum alloy profile extrusion forming machine and relates to the technical field of metal processing. A first flow channel and a liquid supply member are arranged on a rack. One end of the first flow channel extends to the hole wall of a through hole of an extrusion section, and the other end is in communication with the liquid supply member. The lubricating liquid of the hole wall of the through hole of the extrusion section lubricates the billet and the piercing needle and reduces the first friction therebetween. With the extrusion of the billet, the lubricating liquid of the hole wall of the through hole of the extrusion section is gradually consumed and the first friction is gradually increased. When the first friction is greater than a preset value, it indicates that the lubricating effect between the billet and the piercing needle is poor. The liquid supply member delivers the lubricating liquid into the first flow channel to extrude the lubricating liquid in the first flow channel to the hole wall of the through hole of the extrusion section, thereby saving the lubricating liquid, ensuring the lubricating effect between the billet and the piercing needle, reducing the first friction therebetween, reducing the wear of the piercing needle, prolonging the service life of the piercing needle, reducing the damage to the inner surface of the profile, improving the product quality, and reducing the overall energy consumption of the equipment.

The present disclosure provides a shear assisted extrusion press comprising a stem and plunger assembly comprising a main piston configured to generate an extrusion force, a stem assembly comprising a stem having a first end and a second end, wherein the second end connects to a rotary piston that connects to the stem and plunger assembly, wherein the main piston exerts the extrusion force on the stem such that the stem moves axially, and at least one piston motor coupled with the stem and configured to drive a rotational movement of the rotary piston and the stem, and a container assembly comprising a container holder, a container configured to receive a billet and the first end of the stem, and at least one hydraulic motor positioned in the container holder with the container, wherein the at least one hydraulic motor is configured to drive a rotational movement of the container.

The utility model provides a fixed extrusion pad with a flat structure, which comprises a pad body, a hexagon socket head cap screw, a cylindrical pin and a cone, the pad body and the cone are connected through the hexagon socket head cap screw, a first screw mounting hole and a cone mounting groove are arranged on the pad body, the cone is mounted in the cone mounting groove, and the first screw mounting hole is connected with the cylindrical pin. A second screw mounting hole is formed in the cone, the position of the second screw mounting hole is matched with that of the first screw mounting hole, and the hexagon socket cap screw penetrates into the second screw mounting hole through the first screw mounting hole. According to the utility model, the pad body is fixed with the cone through the hexagon socket head cap screw, so that circulating structures such as a movable extrusion pad can be omitted, the production auxiliary time is shortened, and the production efficiency is improved.

The invention discloses an extruding machine for aluminum material manufacturing, and relates to the technical field of aluminum material manufacturing, the extruding machine comprises an extruding machine main body of a rectangular frame structure, and the top end of one side of the extruding machine main body is fixedly connected with an extruding cylinder which is used for containing a metal blank and applying high pressure to metal in the extruding process; the bottom end of the extrusion cylinder is fixedly connected with an extrusion plate used for making direct contact with a metal blank in the extrusion process, the two sides of the upper surface of the extrusion machine body are slidably connected with extrusion rods used for pushing the metal blank forwards, and the inner walls of the two sides of each extrusion rod are provided with annular pressure adduction mechanisms. A surface pressing and rolling mechanism is arranged below the extruding plate, driven cooling mechanisms are arranged on the two sides of the upper portion of the extruding machine body, through mutual cooperation of an extruding ring with a rod and an inner gear and an annular pressing and inward contracting mechanism, pressure can be evenly applied to the periphery or multiple circles in multiple directions, and therefore flowing of metal blanks is better controlled, and the extrusion efficiency is improved. And overhigh local stress caused by pressure concentration is avoided.

The invention provides a system for machining a fork-shaped end based on warm extrusion, and relates to the technical field of machining, the system for machining the fork-shaped end based on warm extrusion comprises a warm extrusion forming device which comprises a metal extruder, a first extrusion die and a second extrusion die, the metal extruder is used for sequentially extruding a metal blank with the temperature lower than the recrystallization temperature and higher than the recovery temperature into the first extrusion die and the second extrusion die; a bending channel is arranged in the first extrusion die, and a forming channel is arranged in the second extrusion die; the linear cutting device is used for cutting the long-strip-shaped fork-shaped end blank into a plurality of fork-shaped end blanks; and the bending forming device is used for bending and forming the fork-shaped end blank to obtain the fork-shaped end piece. Compared with the prior art, the system for machining the fork-shaped end based on warm extrusion has the advantages that the mechanical property of the fork-shaped end is improved, and the production efficiency is improved.

The application relates to an aluminum pipe extrusion system and relates to the technical field of aluminum pipe forming, and comprises a cylindrical outer mold, a first disc body and a plurality of outlet end molds. The cylindrical outer mold can slide along the axis thereof, and the axial two ends of the cylindrical outer mold are provided with a first opening and a second opening. The first disc body can rotate so that the position of each outlet end mold can be matched with the position of the cylindrical outer mold, and then when the cylindrical outer mold slides to the direction close to the first disc body, the first matching part can be inserted into the cylindrical outer mold from the first opening. When the first disc body rotates, different outlet end molds can be matched with the cylindrical outer mold. When an outlet end mold of a certain model is damaged, other outlet end molds in the same group can be used. When another aluminum pipe of a different shape needs to be formed, an outlet end mold in the corresponding group can be used. Therefore, the outlet end mold can be quickly replaced, and the aluminum pipe forming efficiency is improved.

A system for performing shear-assisted extrusion can include a die tool, a headstock, a midstock, and a tailstock. The die tool can include a face configured to engage and plasticize a portion of feedstock material engaged with the face. The die tool can define an opening to receive plasticized feedstock material therethrough. The headstock can be secured to the die tool. The headstock and the die tool can be together rotatable about a central axis to generate a rotation-induced shear force between feedstock material and the die tool to extrude the feedstock material through the opening of the die tool. The midstock can be configured to support the feedstock material at least partially therein. The tailstock can be configured to translate along the central axis relative to the headstock and the headstock to generate an axial extrusion force between the feedstock material and the die tool.

The push-pull nozzle mechanism comprises an extrusion pad, an installation frame and a nozzle mechanism, the installation frame is located on one side of the extrusion pad, and the nozzle mechanism is installed on the installation frame. The nozzle mechanism comprises a driving part and a nozzle, the nozzle can move close to or away from the extrusion pad, and the driving part is connected with the nozzle, drives the nozzle to move close to or away from the extrusion pad and sprays the extrusion pad when moving close to the extrusion pad. An extruding machine comprises a machine body and a push-pull nozzle mechanism capable of being used for the extruding machine, an extruding rod is arranged in the machine body, and an extruding pad is connected with the extruding rod; the mounting frame is mounted on the periphery of the machine body. The nozzle is installed on the side close to the extrusion pad through the installation frame, when the extrusion pad needs to be sprayed, only the driving piece needs to be started to drive the nozzle to move close to the extrusion pad, then the parting agent is sprayed to the extrusion pad through the nozzle, shutdown operation and manual spraying are not needed in the spraying process, automatic spraying of the parting agent is achieved, the production efficiency is improved, and the production cost is reduced. Meanwhile, the operation is safer.

The present disclosure provides a shear assisted extrusion press comprising a stem and plunger assembly comprising a main piston configured to generate an extrusion force, a stem assembly comprising a stem having a first end and a second end, wherein the second end connects to a rotary piston that connects to the stem and plunger assembly, wherein the main piston exerts the extrusion force on the stem such that the stem moves axially, and at least one piston motor coupled with the stem and configured to drive a rotational movement of the rotary piston and the stem, and a container assembly comprising a container holder, a container configured to receive a billet and the first end of the stem, and at least one hydraulic motor positioned in the container holder with the container, wherein the at least one hydraulic motor is configured to drive a rotational movement of the container.

A system for performing shear-assisted extrusion can include a front fixed endstock and a rear fixed endstock. The system can include a front movable headstock and a rear movable headstock. The system can include a die tool connected to the front fixed endstock. The die tool can include a face configured to engage and plasticize a face of feedstock material. The die tool can define an opening to receive plasticized feedstock material therethrough. The system can include a front spindle supported by the front movable headstock. The front spindle can be rotatable to rotate the feedstock material with respect to the front movable headstock. The system can include a rear spindle connected to the rear movable headstock, the rear spindle rotatable with respect to the rear movable headstock and the die tool.

The utility model relates to the technical field of shielding cylinder machining, in particular to a shielding cylinder extrusion forming tool which comprises a forming cutter body assembly and a forming outer sleeve assembly, the forming cutter body assembly comprises an extrusion cutter body, a Morse taper shank is installed on the left side of the extrusion cutter body, and a fixing plug pin is installed on the left side of the surface of the extrusion cutter body in a penetrating mode. A rotating shaft pin is fixedly mounted on the left side of the surface of the extrusion cutter body, an extrusion wrench movably sleeves the surface of the rotating shaft pin, an extrusion fork frame sleeves the center of the surface of the extrusion wrench and located in an inner cavity of the extrusion cutter body, and an extrusion pressing rod is slidably mounted in the center of the right side of the extrusion fork frame. The forming cutter body assembly and the forming outer sleeve assembly are used in a matched mode, the shielding cylinder forming device has the advantage of extrusion machining, the shielding cylinder can be contained through the outer sleeve, the bearing is expanded outwards through displacement of the extrusion cutter body, the shielding cylinder is well extruded and machined under driving of an external machine tool spindle, and the machining roundness and the machining precision of the shielding cylinder are guaranteed.