1186 results about "Bar stock" patented technology

A medical implant made of polymeric material having an increased oxidation resistance is formed by a method including the steps of placing a resin powder in a sealed container. A substantial portion of the oxygen is removed from the sealed contained by either a vacuum, an oxygen absorbent or by flushing with inert gas. The container is then repressurized with a gas such as nitrogen, argon, helium or neon so that long term storage may be possible. On use, the resin in transferred to a forming device which both melts and forms the resin in an oxygen reduced atmosphere to produce a polymeric raw material such as a rod or bar stock. The medical implant is then formed from this raw material annealed and sealed in an airtight package in an oxygen reduced atmosphere. The implant is then radiation sterilized and thereafter annealed in the package for a predetermined time and temperature sufficient to form cross-links between any free radicals in neighboring polymeric chains.

Height and length are adjustable at several points. There is a special type of vise for holding the gunstock. As usual, the vise bolt pulls the movable plate toward the fixed one but, like some of the vise's predecessors, traces out an arc at the top, pivoting from the bottom as the bolt, situated just above the pivot, is turned. Within the movable plate a special cylinder is situated which gives and turns freely in response to the bolt's advance and withdrawal in passing through a threaded tunnel within it. This action prevents the biting down or binding upon the bolt which would otherwise occur because of the plate's pivoted travel as the bolt is advanced or withdrawn. The support's framework, best made from economical tubular bar-stock, is adjustable for leveling and leaning corrections and include anchoring blocks within the structure through which leveling bolts pass.

An antioxidant combined with UHMWPE prior to subjecting the UHMWPE to crosslinking irradiation. In one exemplary embodiment, the antioxidant is tocopherol. After the antioxidant is combined with the UHMWPE, the resulting blend may be formed into slabs, bar stock, and/or incorporated into a substrate, such as a metal, for example. The resulting product may then be subjected to crosslinking irradiation. In one exemplary embodiment, the UHMWPE blend is preheated prior to subjecting the same to crosslinking irradiation. Once irradiated, the UHMWPE blended product may be machined, packaged, and sterilized in accordance with conventional techniques.

The invention discloses a composite machining process for inner and outer rings of narrow-series thin-walled high-precision conical thin-walled bearings, belongs to the technical field of forging, turning, heating and grinding machining of the inner and outer rings of bearing components, and mainly solves the problems of low production efficiency and high rejection rate in a conventional machining method. The composite machining process is mainly characterized by comprising the following steps of: (1) cutting bar stock into straight material sections; (2) after heating, forming a single-forged inner ring and double combined-forged outer rings by using a pressing machine; (3) spheroidizing and annealing; (4) performing shot blasting to remove surface oxide scales; (5) after cutting the double outer rings, performing rough turning and soft grinding; (6) performing additional tempering; (7) performing the soft grinding on the outside diameter of the outer rings, and performing finish turning and rolling; (8) performing heat treatment in quenching and tempering furnaces, and performing shot blasting again; and (9) performing rough grinding machining, the additional tempering, finish grinding machining, super-finishing, cleaning and assembling. The composite machining process has the characteristics of great improvement on product qualification rate and production efficiency, and suitability for batch production on the premise of no increase of equipment investment, and is mainly used for machining the inner and outer rings of the narrow-series thin-walled high-precision conical thin-walled bearings.

The invention discloses a method and a die for the forward extrusion and variable diameter bending extrusion of magnesium alloy semi-solid billets. The preparation method comprises a predeformation process and an isothermal spheroidizing heat treatment process, wherein in the predeformation process, uniform deformation of large deformation amount is realized by the die for the forward extrusion and variable diameter bending extrusion; cutting a magnesium alloy bar stock which is subjected to large deformation by a fixed size; heating the magnesium alloy bar stock cut by the fixed size at the temperature of between 520 and 580 DEG C under the protection of argon, and keeping the temperature of the obtained magnesium alloy bar stock for 10 to 30 minutes; and processing a bending extrusion angle of the die to be over 90 degrees. The method has the advantages of small predeformation resistance, large and uniform deformation, safety, reliability and no three-waste pollution. The grains of the prepared magnesium alloy semi-solid billets have fine size, are uniform and have a shape close to that of a sphere. The method solves the problem that the conventional SIMA method cannot continuously prepare the large-size semi-solid billets and meets the requirements of the semi-solid thixoforming workpieces for large-scale continuous production.

A clamp is used to attach generally rectangular bar stock, such as existing Bookwalter/Codman rings, to a post in a surgical retractor system. The clamp interacts with corners of the ring at any of a wide range of widths and thicknesses, while still retaining a simple and intuitive tightening action such as through a rotational collar which absorbs some of the clamping force as a hoop stress. In the preferred arrangement, the clamp makes a tripod top/planar bottom contact with the generally rectangular bar stock of the ring. An articulating joint permits best fold up of the clamp, with a ball shaft which is constrained within the bisecting plane of the joint clamp. A spherical nut is used on the clamp bolt in one of the clamps, which permits some change in orientation of the clamp bolt when the clamp bolt is tightened using a cammed handle.

This invention provides a preparation method of industrial scale preparing endogeny particle reinforcing aluminum base composite material. That is fusant reaction mthod + electromagnetic agitation proposal + dc casting forming integrated technology. The method is that compound contains reinforcing particle forming element is added to fusing aluminum or aluminum alloy at certain temperature, electromagnetic agitation is applied at the same time to make it fully reaction, and make endogeny particle to disperse uniformly in fusant, the composite material fusant got is cast into bar stock through half joint. The technique is simple, cost is low, period is short, and it can meet industrial production, is a new technology of realizing endogeny particle reinforcing aluminum base composite material industrial scale production. The endogeny particle has high strength, hardness and elastic modulus, the particle dimension is small and disperses uniform in matrix, so the reinforcing effect is good.

The invention discloses a supporting wheel closed forging process and a forging die, and belongs to the technical field of forging. Blanking is conducted on round steel through a band sawing machine; heating is conducted on a bar material through a medium frequency induction heating furnace; jumping-up and preforging are conducted on the hot bar material on a l600T electric screw press, then the hot bar material is transferred to a 2500T electric screw press to be subjected to finish forging and forming through the closed forging die, and finally punching is finished on a 400T mechanical press; normalizing treatment is conducted on a forge piece generated after punching is conducted; the closed forging die adopted for the process comprises a lower cushion block (2), a lower male die (11), a lower base plate (3), a lower female die insert (5), a lower female die (4), an upper male die (6), an upper female die (7) and an upper cushion block (8). By means of the supporting wheel closed forging process and the forging die, burrs do not exist in the forged forge piece, and the total forge piece deformation area is reduced, so that the forging deformation force is lowered, the raw material utilization rate is increased, the subsequent trimming process is omitted, the product cost is lowered greatly, and product efficiency is improved remarkably.

The invention discloses a mirror finished stainless steel bearing and a process technology thereof, which comprise molding of an inner ring and an outer ring of a bar stock, turning operation, heat treatment, plane centerless grinding, coarsely grinding the channels of the inner and the outer rings, heat treatment, finely grinding the channels of the inner and the outer rings, heat treatment, grinding the channels of the inner and the outer rings, assembly and pressing fit a dust cap. The mirror finished stainless steel bearing and the process technology thereof are characterized in that: 9Cr18 stainless steel is adopted as the bar stock; liquid casting passivation is carried out before fine grinding of the channels of the inner and the outer rings; uniform burnishing treatment with a waxing machine is carried out to the inner ring surface, the two end surfaces and the two chamfers of the inner ring and the outer ring surface, the two end surfaces and the two chamfers of the outer ring after grinding the channels of the inner and the outer rings; the dust cap and a retainer adopt material of stainless steel 304, coated with a vacuum ion coating and colored into golden. The mirror finished stainless steel bearing of the invention has strong corrosion resistance and long service life and can be widely used in special environment, such as food machinery, chemical dyeing, marine equipment, pharmaceutical industry, assembly line of IT industry, etc.

The invention relates to a production method of a metal chain ring, in particular to an automatic tandem connection and knitting method of a circular ring chain forged with metal and a device thereof. The method has the following steps: a bent ring bar stock is automatically delivered into a chain bending mechanism, and gripped by a mechanical hand, and first bent to be U-shaped under the effect of left and right chain bending rollers; the U-shaped ring penetrates into two knitted and forged rings and is delivered to a core die through the functions of the mechanical hand, a delivering chain inlet and outlet batch bin mechanism, and a core die mechanism; according to the shape of the core die, the U-shaped ring is automatically bent into the circular ring chain with only one step, thereby the tandem connection and the knitting of the circular ring chain is completed. Then an upper core die is elevated and opened, the mechanical hand takes out the well bent ring chain from the core die, the delivering chain inlet and outlet batch bin mechanism lowers and delivers out the well knitted chain, so that the next bent ring bar stock enters into the chain bending mechanism, and automatic repeating and circulation are continued. The invention proposes the automatic tandem connection and knitting method of the circular ring chain forged with metal with mechanical-electric-hydraulic integration and the device thereof, thereby having the advantages of high production efficiency, stable product quality, high degree of automation, and safe and reliable production process.

The invention discloses automatic material loading, feeding and unloading equipment for bar stock blanking and a method thereof. The equipment comprises a material loading mechanism, a feeding mechanism and an electric cabinet, wherein the feeding mechanism is provided with a mechanical arm, and the mechanical arm is connected with a manipulator. The equipment has the following beneficial effects: 1, the equipment can replace workers in the whole process to realize full-automatic operation of material loading, feeding and unloading, thus the purpose that one worker operates multiple machines can be realized; 2, varieties are convenient to switch; 3, in the feeding process, the manipulator has a function of automatically avoiding a punch die so as to realize multi-row reciprocating operation, especially automatic punching operation of narrow bar stock relatively to the die width; 4, although the structure is installed in front of the punch die, the structure barely affects workers to assemble, disassemble and adjust a die in front of a punch; 5, the shutdown rate of the punch is improved; 6, the equipment has the advantages of simple mechanical structure and low cost and is convenient to maintain; and 7, after material is automatically fed, the bar stock can be subjected to multiple-particle blanking because feeding position is accurate.

A cold precision forging process for a bevel gear is disclosed, and comprises the steps of: cutting the blanking by cylindrical bars; cutting a conical degree on a segmental length of the blank as segmental pre-form for positioning the blank in a die; performing spheroidization for the machined blank to reduce the hardness, then scouring and descaling, phosphorizing, saponifying and lubricating; the first cold precision forging step comprises: upsetting-extruding segmental tooth form in an extrusion mould to obtain a first extrusion which is used as the blank of the second first cold precision forging step; performing spheroidization again for the first extrusion, then scouring and descaling, phosphorizing, saponifying and lubricating; the second cold precision forging step comprises: upsetting-extruding all tooth forms in the extrusion mould to obtain the coarse material of the bevel gear; machining and shaping the coarse material of the bevel gear and cutting unnecessary materials on the end surface to obtain finished products of the bevel gear. The invention further provides an extrusion mould. The invention has higher production efficiency, reduces the material waste, lowers the cost and improves the mechanical property.

The invention discloses a process for manufacturing a bearing ring, which belongs to the technical field of machining. The process comprises the following steps: manufacturing a bar stock, hot forging, annealing, turning, heat treating, grinding, assembling a finished product, and the like. A 3Crl3 material is used so as to meet the requirements on high hardness and wearing resistance of a product, and the convenience of machining the bar stock and the rust proof and anticorrosive performance of the finished product are simultaneously improved. Heat treatment is carried out for the bar stock in a continuous type bright quenching furnace under a vacuum condition, wherein the bar stock is firstly quenched at 1050-1080 DEG C and then is tempered at 600-680 DEG C; and after being tempered, the bar stock is cooled by water. The process greatly improves the hardness control capacity of the bar stock by controlling the quenching temperature, the deformation of the bar stock is improved to 0.0 5mm from 0.2 mm, a good foundation is provided for the machining the bearing ring in a subsequent working procedure, the stability of an interior tissue of the baring ring is guaranteed, the brittleness is reduced and the service life is prolonged.

The invention discloses an aluminum blade of a fan rotor for a mine and a highway tunnel, and the blade is made from an aluminum material and is manufactured by a precision forging technology. The manufacturing steps comprise: (1) manufacturing a set of forging mold according to the physical dimension and the profile shape of the blade, wherein the mold comprises a hammer forging die and a trimming die; (2) heating a forged aluminum bar stock, and forging a blank the shape of which is similar to that of the blade by adopting a free forging technology; (3) heating the blank, and placing the blank in the hammer forging die to perform hammer forging forming; (4) cutting burr by the trimming die; (5) polishing trimmed burr by an angle grinder; (6) checking the transmittance of a blade basin and a blade back of the blade body, taking the blade basin and the blade back with the transmittance less than or equal to 1.5mm into the next working procedure, or else returning for reforging; (7) carrying out heat treatment and quenching; (8) carrying out cold straightening; and (9) carrying out artificial treatment. The density and strength of the blade manufactured by the material and method is greater than that of the aluminum blade, by adopting the blade with the same specification, the rotation speed and the flow rate of the fan can be improved, the performance of the fan is strengthened, and the cost is reduced.

A switching assembly includes a pair of hollow ties, a pair of supports, and a linkage. The linkage extends generally through the hollow ties, whereby the cribs are generally free of linkage components, and the ballast in the cribs can be compacted with known automated machinery. The linkage includes a number of lugs and a number of rods, with the rods each being formed from standard bar stock and threaded, and with the linkage configuration avoiding the need to custom bend any of the rods. The hollow ties are formed from generally available standard box section steel, as are the supports. The spacing between the hollow ties can be varied in accordance with the pitch of the other rail ties of the railroad switch. Each hollow tie can include a heater. The switching assembly is highly adjustable, which makes it suitable for use in numerous different track configurations.

An automatic feeding system of a fine blanking bar stock comprises a material shifting device, a material lifting device and a bar stock trolley, the material shifting device drives the material lifting device to carry out horizontal back and forth movement, sectional materials in the material lifting device are driven to move up and down through a lifting cylinder, electromagnets are arranged on the sectional materials, and a bar stock is arranged in a bar stock groove in the bar stock trolley. When the automatic feeding system is used, the material shifting device first drives the sectional materials to move to the position over the bar stock groove, the material lifting cylinder drives the sectional materials to move downwards to attract the bar stock through the electromagnets and then moves upwards, and the material shifting device drives the sectional materials to return to place the attracted bar stock on a blanking platform. The automatic feeding system of the fine blanking bar stock is small in labor intensity, good in accuracy and high in working efficiency, it can be guaranteed that only one bar stock is attracted every time, and the bar stock can be fixed effectively.

The invention discloses a surface treatment method of a piston for a quartering hammer, which comprises the following steps: raw materials are forged and pressed to form a bar stock for the piston and then isothermal annealing is conducted; rough treatment is conducted on a plain lathe and finishing allowance of 2mm is left on a circumferential surface and a scope of attack; the piston is carburized to lead the depth of a carburized layer to be up to 3mm; the circumferential surface of the piston is cut by 1.5mm on a numerically controlled lathe and the scope of attack thereof is cut by 2mm for fine treatment; the piston is quenched and tempered; and the circumferential surface of the piston is grinded, and the like. The surface treatment method of the piston for the quartering hammer firstly utilizes carbonization and then machining, and uses a more removal of the scope of attack to cause the scope of attack to become a low-carbon martensite, thereby enhancing the surface hardness of the scope of attack so as to be capable of improving the shock resistance of the scope of attack. In addition, the method for firstly conducting carbonization and then machining and finally quenching is adopted to reduce the deformation of the piston, thus being capable of greatly reducing the stock removal, and increasing the qualification rate of products.

The invention provides a machining method of a high-precision deep and long hole thin-walled sleeve part. The machining method comprises the following steps that a rod is clamped and subjected to rough-machining forming, the machining allowance is reserved, and a process chuck is reserved; a roughly-machined workpiece is subjected to thermal treatment aging; and the process chuck of the workpieceis clamped by a lathe, finish machining of the workpiece is completed during primary clamping machining according to a workpiece drawing, and finish machining is divided into the following working steps that a core shaft, a lining and a screw are manufactured; the process chuck is clamped on the lathe, the core shaft is crammed into roughly-machined inner holes of the workpiece, and an outer circle of the part is machined to the required dimension; the screw is screwed into a core shaft threaded hole, and the core shaft is taken out of the workpiece; the lining sleeves the machined outer circle of the workpiece, the outer end face of the workpiece is machined, and the large and small inner holes and the bottom face are bored; tool setting is conducted from the bottom face, the outer end face of the workpiece is machined, and the length dimension L2 of the workpiece is ensured; and the workpiece is cut off, and the total length L1 of the workpiece is ensured. According to the machiningmethod of the high-precision deep and long hole thin-walled sleeve part, the rigidity of the part is improved, machining deformation of the part is reduced, vibration during thin-walled part machiningis reduced, and the machining quality and surface roughness are improved.