621 results about "Bar stock" patented technology

The invention relates to the technical field of forge piece forming, in particular to a deep-cavity thin-wall support forge piece, a forging die and a forming method.The deep-cavity thin-wall support forge piece is characterized in that a heated round bar is subjected to roll forging to obtain a preformed blank, and oxide skin of the blank obtained after roll forging is removed; putting the prefabricated blank into a pre-forging cavity of a forming die, and performing pre-forging forming; after pre-forging is finished, the pre-forged piece is transferred into a precision forging cavity of the same forming die to be subjected to precision forging forming, and a bilaterally symmetrical precision forging piece is obtained; putting the bilaterally symmetrical precision forgings into a slicing die frame for trimming, and cutting off flashes; cutting the bilaterally symmetrical precision forgings subjected to cold shaping from the shunting bin through a cutting device, and separating the bilaterally symmetrical precision forgings into two independent single forgings; forming defects are eliminated, and the forging yield is improved to the level of stable mass production; the thickness tolerance of the functional surface of the product is ensured, the spot welding current stability and the welding strength are ensured, the assembly requirement is met, and the dependence on subsequent machining is reduced; the material cost is reduced and the mold life is prolonged.

The invention relates to the technical field of metal powder manufacturing products, in particular to an automatic ring part production line and a process control method.Bar heating furnaces of the production line are arranged on the inner side and the outer side of a guide rail in two rows and multiple sets, a transfer manipulator is arranged on the guide rail, a ring forging press machine is arranged at the front end of the guide rail, and a movable workbench is arranged at the ring forging press machine; the ring rolling machine is arranged in front of the ring forging press machine, the center line of the ring rolling machine and the center line of the ring forging press machine are obliquely arranged, a carrying mechanical arm is arranged between the ring rolling machine and the ring forging press machine, the conveying roller way is arranged in front of the ring rolling machine, and the center line of the conveying roller way and the center line of the ring rolling machine are obliquely arranged. The center line of the conveying roller way is parallel to the center line of the ring forging press, and the swing manipulator is arranged in an included angle formed by the ring rolling machine and the conveying roller way. According to the production line and the control method, the production process is optimized, the production efficiency is improved, and the production cost is reduced.

The invention discloses a weldless integral high-strength feeding drill rod and a preparation method thereof. The drill rod comprises a female connector, an elevator groove, a thick-wall slip clamping section, a drill rod pipe body and a male connector which are integrally formed and have the same inner diameter. The drill rod is manufactured by integrally machining a solid bar or a thick-wall pipe body. The yield strength of the drill rod pipe body, the yield strength of the thick-wall slip clamping section and the yield strength of the elevator groove are 135 ksi-180 ksi, and the yield strength of the male connector and the yield strength of the female connector are 130 ksi-150 ksi; the outer diameter of the thick-wall slip clamping section is larger than that of the drill rod pipe body; the outer diameter of the elevator groove is smaller than that of the clamping section of the thick-wall slip; the outer diameter of the elevator groove is not smaller than that of the drill rod pipe body. The outer diameter of the connector does not need to be obviously increased, meanwhile, enough elevator lifting capacity is guaranteed, and the problem of poor structure performance caused by friction welding seams and welding area heat treatment is avoided. Complicated welding, postweld heat treatment and other procedures are omitted, the possibility that a weld joint serves as a performance weak link is avoided, higher comprehensive tensile mechanical performance is achieved, and the method is suitable for well drilling application of extra-deep wells, ocean deep wells and the like.

The invention relates to the technical field of metal material plastic forming, and discloses an extrusion feeding device, an extrusion forming system and a control method.The extrusion feeding device comprises a loading module and a feeding driving module, and the loading module is arranged between an extrusion driving device and an extrusion forming device; a plurality of loading parts used for loading bars are distributed on the loading module, the plurality of loading parts extend and penetrate in the first direction, the loading module is provided with a heating assembly, and the heating assembly is used for heating the bars of the plurality of loading parts; the feeding driving module is used for driving the loading module to move in the direction perpendicular to the first direction so as to control the loading module to move out of or move into the working position between the extrusion driving device and the extrusion forming device. According to the invention, the heating assembly and the plurality of loading parts are adopted, bar material supplement and temperature stabilization are completed in the extrusion stroke, the extrusion temperature of the bar material can be accurately controlled, and the controllability of extrusion process conditions is ensured.

The invention discloses a bar cutting device, relates to the technical field of machining equipment, and aims to solve the problems of low bar cutting efficiency and poor size consistency in the prior art. The device comprises a supporting frame, and an equidistant cutting mechanism, an equidistant clamping mechanism and an auxiliary assembly are arranged on the supporting frame; the equidistant cutting mechanism comprises a cutting frame, a cam shaft and a spline shaft are rotationally arranged on the cutting frame, a spacing sliding block is slidably arranged on a guide shaft, a cam shaft spiral groove drives the spacing sliding block to slide equidistantly through a driven protrusion, the spline shaft is sleeved with a spline sleeve, and the spline sleeve is connected with a saw disc. The equidistant clamping mechanism comprises a clamping frame and is linked with a distance separation sliding block through a linkage rod, so that the clamping position corresponds to the cutting position; the auxiliary assembly comprises a material supporting frame, a bar detection assembly, a limiting assembly and a material receiving plate. The device can complete multi-section equal-distance cutting of the bars at a time, is high in cutting efficiency and good in size consistency, and meets the cutting requirements of the bars of different specifications.

The utility model discloses a full-automatic extruding and cutting integrated device for petuntse bars. The full-automatic extruding and cutting integrated device comprises a mixing box, the two transmission rotating shafts are rotatably mounted in the mixing box, and two rotating blades are fixedly connected to the outer sides of the transmission rotating shafts and used for pushing and extruding the pug downwards; the extrusion pipe is arranged in the mixing box, an extrusion screw rod is installed in the extrusion pipe, and an extrusion die head is installed at the discharging end of the extrusion pipe; the pug cutting device has the advantages that after cutting is completed, the clamping part can accurately clamp pug, the moving part enables the clamped pug to be stacked towards the cart on one side, manual operation is reduced, and production efficiency and safety are improved; the clamping plates are obliquely arranged, the two single-shaft air cylinders drive the clamping plates on the two sides to move towards the middle, pug can be clamped and fixed from the two sides, it is guaranteed that the pug cannot fall off in the carrying process, and the carrying accuracy is guaranteed.

The utility model relates to the technical field of lathes, in particular to a high-precision deep hole machining lathe, and aims to solve the technical problems that when a lathe is used for machining deep holes, a supporting frame needs to be adopted for supporting, a bar is supported by manually rotating the supporting frame composed of a plurality of screws, and precision is low. The upper ends of the supporting legs are connected with a hollow disc, the hollow disc and the centering clamp are concentrically arranged, a plurality of rotating shafts are evenly and rotatably connected to the upper circumference of the hollow disc, the rotating shafts can be driven and locked through a driving device, the rotating shafts are connected with connecting rods, the tail ends of the connecting rods are rotatably connected with rolling wheels, and the distances from the circle center of each rolling wheel to the circle center of the hollow disc are equal. A bar is placed between the centering clamps and the rolling wheels in the hollow disc, the driving device drives the connecting rods evenly distributed on the circumference to rotate synchronously, the connecting rods drive the rolling wheels to rotate to clamp and center the bar, at the moment, the centering clamp located at one end is controlled to clamp the bar, and the automatic centering precision of the multiple connecting rods is very high.

The invention relates to the technical field of forging, in particular to a step-by-step vertical forging forming method for a GH4169 alloy low-pressure turbine shaft part. A forge piece is designed according to the shape of the turbine shaft; the forge piece comprises a rod part and a head part which are coaxially arranged, the rod part and the head part 2 are connected through a transition area, and the diameter of the head part is larger than that of the rod part. Initial bar specifications are determined according to the rod part and the head part, and blanking is conducted; drawing out and forming the rod part; locally heating the head; and vertically upsetting the head. According to the method, the step-by-step forming process of drawing out the rod part through one time of heating and upsetting the head part through two times of heating is adopted, so that the heating number is effectively controlled, the repeated heating times are reduced, the production efficiency is improved, the consistency of overall deformation of the forge piece can be kept, and the problems of coarse grains and uneven structures caused by multiple times of heating are solved.

The utility model relates to the technical field of copper bar machining, in particular to an adjustable copper bar cutting device which comprises a base, two sliding rails are symmetrically and fixedly installed at the top end of the base, sliding blocks are installed in the sliding rails in a sliding mode, limiting mechanisms are arranged at the top ends of the sliding blocks, connecting plates are fixedly installed on the sides, close to each other, of the sliding blocks, and the connecting plates are connected with the sliding rails. A rack is fixedly mounted on one side of the top end of the base. The copper bar cutting device has the beneficial effects that a stepping motor is matched with a driving wheel, a synchronous belt and a driven wheel to drive a threaded rod to rotate synchronously, then a sliding block can be driven to move in a sliding rail until a copper bar in a limiting mechanism moves to the lower portion of a cutting piece, a transverse moving mechanism can drive the cut copper bar to reset, automatic feeding and discharging are achieved, the automation degree is high, and the cutting efficiency is high. Copper bars can be fully automatically fed and cut, the manual operation time is greatly shortened, the working intensity is reduced, meanwhile, workers are prevented from getting close to a cutting piece, and the safety is improved.

This utility model discloses a bar stock support frame, specifically relating to the field of support frame technology. It includes a support frame with a slanted groove seat fixedly connected to its upper surface. A connecting block is fixedly connected to the lower inclined surface of the slanted groove seat. An adjustment and positioning component is provided on the lower surface of the connecting block. The adjustment and positioning component includes: a support frame fixedly connected to the lower surface of the connecting block; a screw rotatably mounted on the inner wall of the support frame; and two threaded connecting blocks connected to the outer wall of the screw; and a linkage bar fixedly connected to the upper inclined surface of the connecting blocks. The two threads on the outer wall of the screw are opposite and symmetrically arranged. This utility model uses an adjustment and positioning component. The screw drives the two connecting blocks, and under the action of the threaded meshing force, the distance between the two connecting blocks increases, and the distance between the two limiting bars increases. The bar stock can be tilted and adjusted according to its actual position, resulting in better support for the adjusted bar stock.

The application discloses a blade precision forging forming method and a blade, and comprises the following steps: S1: designing a final forging forming die according to M blade type section coordinate parameters provided by a blade part design drawing; S2: designing a pre-forging forming die according to parameters of a cavity of the final forging forming die; S3: designing an extrusion blanking die according to parameters of cavities of the final forging forming die and the pre-forging forming die; and S4: adopting the designed die, sequentially performing extrusion blanking of a bar, pre-forging forming and final forging forming to obtain a final forging piece. According to parameters of the blade part design drawing, the shape and size of the final forging piece, the pre-forging piece and the extrusion blank are accurately designed, and corresponding dies are designed to perform forming processing, so that the bar is gradually deformed according to needs in the forming process, metal materials are gradually distributed according to needs, burrs are not generated between forming steps, the blade die life and the blade size stability can be improved, and the utilization rate of metal raw materials can reach more than 80%.

This invention relates to a tooling and method for fabricating driven bevel gear assemblies using high aspect ratio bar stock. This method involves separately forming the driven bevel gear and its shaft, then welding them together to achieve integrated forming and welding. This results in the overall forming of the driven bevel gear assembly, avoiding welding deformation issues caused by the structural features of the assembly, improving the assembly's yield rate, and providing a solution for assembly structural design. This method can utilize smaller diameter raw material bars to fabricate driven bevel gear assemblies, not only achieving overall forming of the driven bevel gear assembly but also improving material utilization, increasing efficiency, and reducing costs.

The automatic feeding device comprises a feeding base assembly connected with the centerless grinding machine, a linear vibrator is arranged at the upper end of the feeding base assembly, an automatic feeding rail is arranged at the upper end of the linear vibrator, a feeding groove is formed in the upper end of the automatic feeding rail, and a feeding groove is formed in the lower end of the automatic feeding rail. The cross section of the feeding groove is in a funnel shape. According to the automatic bar grinding machine, manual feeding is changed into manual feeding, then the straight vibration automatic feeding device is used for feeding, the labor intensity of production personnel is greatly reduced, operation is easy and convenient, the safety performance is high, only a plurality of bars need to be manually placed on the feeding track, the bars enter the machine along with vibration of the feeding track for grinding, and the production efficiency is greatly improved. Meanwhile, manual feeding is replaced with mechanical feeding, the quality problem caused by carelessness of workers is avoided, the production quality can be guaranteed, the production efficiency can be improved, and production personnel can reasonably arrange the operation time.

The utility model relates to the technical field of aluminum profile processing, and discloses an aluminum profile continuous extruding machine which comprises a base, a first mounting frame fixedly connected to one side of the base, a second mounting frame fixedly connected to the other side of the base, a servo motor fixedly connected to the first mounting frame, a rotating frame fixedly connected to an output shaft of the servo motor, and a rotating shaft fixedly connected to the rotating frame. The rotating frame is fixedly connected with an oil pump, the oil pump is connected with two sets of hydraulic telescopic machines, the oil pump is provided with two sets of oil outlet ends and oil inlet ends, and the two sets of hydraulic telescopic machines are respectively connected with one set of oil outlet ends and oil inlet ends; bars are extruded in the mode that the two sets of hydraulic machines rotate and are alternately used, when one set of hydraulic machines stretch out, the other set of hydraulic machines contract, the two sets of hydraulic machines are recycled, and therefore continuous extrusion of the bars is achieved, and the machining efficiency of equipment is improved.

The utility model relates to the technical field of nickel alloy processing, in particular to a nickel alloy heat treatment furnace convenient to adjust temperature control, which comprises a bottom plate and a furnace body fixedly connected to the upper end of the bottom plate, a rotating shaft is rotatably connected to the rear part of the interior of the furnace body through a bearing, and supporting rods and starting motors are fixedly connected between a plurality of connecting plates and the rotating shaft. The motor drives the second gear to rotate, the second gear drives the first gear to rotate, the first gear drives the rotating rod and the rotating shaft to rotate, the rotating shaft drives the multiple charging barrels to rotate with the rotating shaft as the center, accordingly, the nickel alloy bars in the multiple charging barrels roll, and the multiple through holes are formed in the outer walls of the multiple charging barrels, so that heat circulates; the nickel alloy bar rolling in the charging barrel is matched, heating is more uniform, the heating efficiency is effectively improved, the overall heat treatment efficiency is improved, the PI D controller is responsible for adjusting the heating current in furnace body temperature control, accurate control over the heating process is achieved, and temperature control is convenient.

The utility model relates to the technical field of rust removal devices, and discloses a surface rust removal device for round steel bars, which solves the problem of incomplete rust removal of the rust removal device and comprises a support table, bar support mechanisms are arranged at two ends of the top of the support table, and a movable rust removal mechanism is arranged at the top end of the support table. The movable rust removal mechanism is connected with the supporting table through a movable driving assembly, the bar supporting mechanism is composed of two U-shaped supporting seats, a first carrier roller, a second carrier roller and a rotary driving assembly, and the first carrier roller and the second carrier roller are rotationally connected between the two U-shaped supporting seats; the rotary driving assembly is connected between one U-shaped supporting base and the first carrier roller and between one U-shaped supporting base and the second carrier roller. The movable rust removal mechanism is composed of a movable frame, a supporting plate, a supporting arm, a driving motor, a first belt wheel, a movable arm, a hinge shaft, a second belt wheel and a rust removal abrasive belt. Through the rust removal device, the rust removal convenience and comprehensiveness can be improved.

The application discloses a bar rolling blanking device and belongs to the technical field of bar rolling, which comprises an upper die and a lower die, wherein the upper die comprises an upper die bottom plate, a punch and a pressing rod; the punch and the pressing rod are arranged below the upper die bottom plate; the lower die comprises a lower die bottom plate, a positioning support, a positioning wheel, a bearing support, a rolling wheel set and a floating positioner; the positioning support, the bearing support and the floating positioner are arranged above the lower die bottom plate; a limiting guide groove is formed in one side of the positioning support; the bearing support is hinged with the rolling wheel set on the side close to the positioning support; the floating positioner is located below the pressing rod and moves up and down along with the pressing rod. Compared with the prior art, the application has the advantages of simple manufacturing and installation, low maintenance cost, guaranteed blanking quality, reduced labor cost and labor intensity, and can be operated by using general stamping equipment such as punch presses or oil presses, without the need of using special equipment such as roll forging machines and wedge cross rolling machines.

The application provides a large height-diameter ratio titanium-aluminum alloy blank manufacturing device and method. The method comprises the following steps: S10, designing a blank: designing a forging according to a target titanium-aluminum alloy blade; the forging comprises a blade root part, a blade body part and a blade crown part; presetting the shape and size of the blank according to the forging; S20, obtaining a forming die and a raw material: preparing the forming die according to the preset shape and size of the blank in step S10, and selecting a bar; S30, adopting the forming die to perform upsetting forming on the bar to obtain the blank; and performing hot working on the blank to obtain a target titanium-aluminum alloy blade forging. The large height-diameter ratio titanium-aluminum alloy blank manufacturing method and device can solve the problems of blank instability of a large height-diameter ratio metal bar and high mold cost caused by titanium-aluminum alloy isothermal forming, realize non-isothermal forming of a large height-diameter ratio titanium-aluminum alloy special-shaped part, improve material utilization, reduce waste of titanium-aluminum alloy material, and effectively reduce the machining cost of the blade.

The present application relates to a kind of automatic material dumping and box withdrawing method suitable for AGV car, which adopts the material dumping and box withdrawing structure including material box dumping mechanism, empty box conveying belt being arranged below material box dumping mechanism, material box transfer mechanism capable of transferring material box between material box dumping mechanism and empty box conveying belt, and comprising the following steps: S1, dumping material;S2, exit empty box.The present application realizes AGV car automatic turnover material box to dump bar material on one hand, turnover is stable, ensures that bar material is all fallen on feeding platform, reduces labor intensity and manpower cost;On the other hand, it realizes automatic empty box withdrawal, to facilitate AGV car to carry out next feeding action in time, effectively improves production efficiency;At the same time, opening direction is unchanged when empty box is withdrawn, to facilitate next material preparation.

This invention discloses a short-process bar rolling method and system. The method includes the following steps: S1, heating the billet in a heating furnace; S2, descaling with high-pressure water; S3, completing eight rolling passes in rolling zone one; S4, performing multiple-length segmentation with a first flying shear; S5, performing four rolling passes in rolling zone two; S6, performing multiple-length segmentation with a second flying shear; S7, performing diameter reduction rolling on the bar using a KOCKS mill; S8, a third flying shear; S9, water cooling; S10, cooling; S11, shearing the bar to length; S12, finishing and annealing; S13, magnetic flux leakage testing. This invention can meet the requirements for bar shape and size as well as the requirements for flaw detection, achieving integrated bar heating, controlled rolling and cooling, and flaw detection while saving space. This invention can reduce the number of traditional bar rolling passes, realizing short-process bar production with small space requirements, low power consumption, customization, greenness, and low carbon emissions.

The invention relates to the technical field of bolt machining, in particular to cutting equipment for bolt production and machining, which comprises a support mounting cylinder, and further comprises an adaptive feeding mechanism, a cutting mechanism, a cutting mechanism, a cutting mechanism, a cutting mechanism, a cutting mechanism and a cutting mechanism, the adaptive feeding mechanism comprises a feeding mounting cylinder arranged at one end of the support mounting cylinder, and two groups of adjusting guide modules are symmetrically arranged in the feeding mounting cylinder; a material guide mounting cylinder is arranged at the other end of the supporting mounting cylinder; and the adjusting cutting mechanism comprises a rotating adjusting module, a distance adjusting module and a rotating clamping module, the rotating adjusting module comprises a rotating mounting barrel arranged on one side of the end of the material guiding mounting barrel, and the rotating clamping module comprises a displacement mounting disc right opposite to the rotating mounting barrel. According to the device, processing of bar materials with size difference at the two ends is taken as a core breakthrough point, the self-adaptive feeding, multi-mode clamping and fine adjusting technologies are combined, a machining platform which is flexible in height, stable and reliable is constructed, and the device has remarkable technical progress in the aspects of improving the machining range and improving the production efficiency.

This invention relates to the field of cutting machine technology and discloses an automatic cutting machine tool suitable for multi-specification bars. It includes a feeding mechanism, a planar trimming mechanism, a step trimming mechanism, a conveyor rack, a loading trolley, and an unloading trolley. The planar trimming mechanism and the step trimming mechanism are respectively located at both ends of the feeding mechanism. Both mechanisms include cutting cutter heads, which are used to cut the neutral plane and step of the bar spindle, respectively. The conveyor rack is located at the front end of the feeding mechanism, and a conveying structure is installed above it. The loading trolley is located at the front end of the conveyor rack, and the unloading trolley is located at the rear end of the feeding mechanism. This invention, through its symmetrical planar trimming and step trimming mechanisms, significantly outperforms the eccentricity error of traditional lathes, meets the requirements for multiple specifications, maintains structural stability even during high-speed cutting, extends tool life by 50%, reduces the surface roughness to Ra1.6μm, adapts to bars of different lengths, and achieves a closed-loop loading and unloading system.

This invention belongs to the field of forging hot working and relates to a forging method for a cross-shaped TC32 titanium alloy die forging. The method includes: selecting a bar stock as a billet; upsetting the bar stock and shaping it into a cuboid; reversing the direction of the billet and elongating it along its short side, shaping it into an irregular octagonal cross-section cube as the billet; on the cube, the surface corresponding to the web of the cross-shaped TC32 titanium alloy die forging is larger than the surface corresponding to the high ribs of the cross-shaped TC32 titanium alloy die forging, and the web material is also more than the high rib material; vertically placing the billet into a pre-forging die along its height direction for upsetting to obtain a cross-shaped pre-forging; the cross-shaped pre-forging has lugs at both ends; the larger lug is used to form the high ribs with bosses, the smaller lug is used to form the high ribs, and the middle of the pre-forging is used to form the web; rotating the pre-forging 90° and placing it with the larger lug facing upwards into the final forging die for cross-shaped reversing forging.

The application provides a precision integrated machining system and method for machining tangential hole type centrifugal micro nozzle, which comprises the following steps: firstly, rough turning the end face and the outer circle of the bar stock clamped by the spindle tool system, then machining the tangential micro hole by the tangential micro hole drilling system, machining the coaxial flow channel hole, the part end face and the outer circle clamping face by the spindle tool system, repeating the machining and feed, removing the burrs at the inlet and outlet of the tangential micro hole, then driving the secondary spindle chuck to clamp the outer circle clamping face, rotating the spindle and the secondary spindle synchronously, machining the remaining outer circle by the spindle tool system until the part is cut off from the bar stock, clamping the cut-off part by the secondary spindle chuck, machining the cut-off end by the secondary spindle tool and removing the machining burrs. The application has small error and high production efficiency compared with the traditional machining method.

The flexible material distributing machine comprises a first machine frame, an inclined bottom hopper is arranged on the first machine frame, a transverse-strip-shaped discharging opening is formed in the side face of the lowest position of the inclined bottom hopper, a gate installed on the inclined bottom hopper in a sliding mode is arranged above the discharging opening, and the gate can slide up and down to adjust the discharging width of the discharging opening; a rotatable cam shaft is transversely installed at the end, away from the inclined bottom hopper, of the gate. The gate further comprises a supporting base, the top face of the supporting base is a bearing face, and the bearing face is located below the gate and used for bearing bars rolling out of the discharging port. The camshaft comprises a cam; when the cam shaft is in a static state, the protruding part of the cam can block bars rolling out of the discharging port. In the process that the cam shaft rotates by one circle, the protruding part pushes the blocked bar to move in the direction away from the discharging port, and the blocked bar is reset to the blocking state after rotating by one circle, so that only one bar is output in each rotation; the device is good in compatibility, and single-piece output of bars with different diameters on the same material distributing machine can be achieved.

A method and system for preparing forged structural parts from TC6 material are disclosed. First, TC6 bar stock is sawn, and the β-phase transformation temperature (Tβ) of the sawn TC6 bar billet is measured. Then, the billet is heated to a high temperature (Tβ-40) ±10℃ in an electric furnace and held to obtain a pre-treated TC6 bar billet. Next, the pre-treated TC6 bar billet undergoes a series of processes in sequence: small-end aggregation, flat forging, bending, flat forging, large-end aggregation, flat forging, large-end forming, flat forging, and intermediate billet treatment to obtain a secondary-treated TC6 bar billet. This secondary-treated TC6 bar billet is then heated to a high temperature (Tβ-40) ±10℃ in an electric furnace and held to obtain a billet to be forged. Finally, it is forged using an electric screw press, followed by heat treatment, isothermal annealing, and physicochemical testing to obtain the machined TC6 material structural part. Finally, the parts are inspected, and qualified parts are stored in the warehouse. This process yields qualified structural parts.

The application provides a bar efficient polishing device, belonging to the technical field of metal processing. It comprises a rack, a polishing mechanism arranged on the rack and a feeding mechanism arranged on the rack. The polishing mechanism comprises a plurality of polishing assemblies and a speed reducer one. The polishing assembly comprises an installation body one, a polishing cylinder rotatably connected to one end of the installation body one and a driving gear one rotatably connected to the installation body one. The outer wall surface of the polishing cylinder is provided with a driven gear one. The polishing cylinders are coaxially arranged. The output shaft of the speed reducer one is connected to each driving gear one. The feeding mechanism comprises a plurality of parallel feeding assemblies and a speed reducer two. The feeding assembly comprises an installation body two, a feeding cylinder rotatably connected to one end of the installation body two and a driving gear two rotatably connected to the installation body two. The outer wall surface of the feeding cylinder is provided with a driven gear two. The output shaft of the speed reducer two is connected to each driving gear two. A sliding block is slidingly connected to the rack. The application has the advantages of high polishing efficiency.

The invention belongs to the technical field of bar production, and particularly relates to a steel bar for an engine crankshaft and a production method thereof, and the steel bar comprises the following chemical components in percentage by mass: 0.25%-0.30% of C, 0.20%-0.30% of Si, 1.00%-1.10% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, 1.20%-1.30% of Cr, less than or equal to 0.25% of Ni, 0.05%-0.09% of Ti, 0.15%-0.20% of Mo, 0.06%-0.10% of V, less than or equal to 0.10% of Cu and the balance of Fe and inevitable impurities. The method has the advantages that the steel bar for the engine crankshaft is produced by adopting the ecological electric furnace + LF + RH + continuous casting smelting process and the rolling process, and the strict requirements of the steel bar for the high-end engine crankshaft in the aspects of obdurability, fatigue life and surface quality are met.

The utility model discloses a sorting and packaging machine for metal product bars. The sorting and packaging machine aims at solving the technical problem that in the prior art, defective bars cannot be conveniently detected in time and accurately. Comprising a workbench, a conveyor is assembled on the top surface of the workbench, a limiting groove is formed in the top surface of the conveyor, a packaging box is arranged in the limiting groove, and a feeding assembly is arranged on the top surface of the workbench close to the right side; the top face of the conveyor is movably connected with a detection plate, a detection trigger assembly is arranged on the side wall of the detection plate, a film pressing plate is assembled on the portion, located on the upper side of the limiting groove, of the top face of the conveyor, and a film covering assembly is arranged on the portion, located on the rear side of the conveyor, of the top face of the workbench. And the reliability of bar packaging is effectively ensured.

The utility model discloses a bar positioning die and relates to the field of bar machining, the bar positioning die comprises a supporting frame and a bar, a table top is arranged on the supporting frame, a transverse positioning mechanism and a longitudinal positioning mechanism are installed on the table top, and the bar penetrates through the inner side of the transverse positioning mechanism and the inner side of the longitudinal positioning mechanism. The transverse positioning mechanism can limit the two sides of the bar, and the longitudinal positioning mechanism can limit the upper portion and the lower portion of the bar. An adjusting plate located on the upper portion is moved downwards, so that the inner wall of a groove in the adjusting plate on the upper portion is attached to the upper portion of a bar, a second friction pad makes contact with the bar, the friction force of the contact part is increased, the lower portion of the bar is located on the adjusting plate on the lower portion, and then a pushing nut is rotated to move downwards step by step; the upper adjusting plate and the lower adjusting plate are attached to the surface of the upper adjusting plate, the upper adjusting plate is limited, and the bars are limited through the upper adjusting plate and the lower adjusting plate, so that the bars can be prevented from moving longitudinally during machining.