32results about How to "Uniform inner diameter" patented technology

A hollow body formed of a thermoplastic resin and having uniform inner diameter and thickness and an excellent inner surface smoothness, and, in particular, a pipe-shaped hollow body having a bent portion is manufactured by injection molding.

A method of manufacturing a hollow body includes injecting a molten resin 8 into a mold cavity 2 of a mold 1, the mold cavity 2 having on its one end a pressure port 4 provided with a floating core 6 and on its other end an outlet 5, pressure-injecting a pressurized fluid through the pressure port 4 after the injection of the molten resin 8, and moving the floating core 6 toward the outlet 5, and, at the same time, extruding the molten resin 8 from the outlet 5.

In the method, the floating core 6 is constituted of a columnar portion and a top portion, which is continuously connected to one surface of the columnar portion and has a shape that a cross-sectional area perpendicular to a central axis of the columnar portion gradually decreases from one surface side of the columnar portion. When a diameter of the columnar portion is represented by A, the height of the columnar portion is 0.1 A to 1 A, and the height of the top portion is 0.3 A to 1.6 A.

An entry sheet of the present invention is used in cutting a fiber reinforced composite material and/or a metal. Moreover, in a cutting method of the present invention, cutting of a fiber reinforced composite material and/or a metal is performed using the entry sheet.

The invention relates to a heat-insulating oil sleeve. The heat-insulating oil sleeve is characterized by comprising an outer pipe, an intermediate pipe and an inner pipe which are sleeved in a clearance fit way; internal threads are machined at one end of the intermediate pipe; external threads are machined at the other end of the intermediate pipe; one end, provided with the internal threads, of the intermediate pipe is welded with the outer pipe at a pipe end, and is welded with the inner pipe at the length position of the preserved internal threads; one end, provided with the external threads, of the intermediate pipe is welded with the outer pipe at the length position of the preserved external threads, and is welded with the inner pipe at the pipe end; an annular cavity formed by the outer pipe and the intermediate pipe is filled with a heat-insulating material and is vacuumized to form a first heat-insulating layer; an annular cavity formed between the intermediate pipe and the inner pipe is vacuumized and is injected with inert gas to form a second heat-insulating layer. A manufacturing method for the heat-insulating oil sleeve comprises the following steps in sequence: performing pretreatment on the three pipes, sleeving and welding the inner pipe and the intermediate pipe, treating the annular cavity between the inner pipe and the intermediate pipe, sleeving and welding the outer pipe and the intermediate pipe, treating the annular cavity between the outer pipe and the intermediate pipe, testing an apparent heat conductivity coefficient and machining threads at the two ends of the intermediate pipe. The heat-insulating oil sleeve has a structure with three layers of steel tubes and double layers of heat-insulating layers, high heat insulation performance, long heat insulation life and high performance.

The present invention provides a hollow body molding device which allows easy confirmation of passage of a floating core through a molded body and facilitates quality control at the site.

In a hollow body molding device in which a molten resin is injected into a main cavity 1, a pressurized fluid is pressure-injected through a pressure port 3 after the injection of the molten resin, a floating core 2 is moved to the outlet side, the molten resin is extruded from the outlet simultaneously with the movement of the floating core 2, and a hollow molded body 12 is molded, the hollow body molding device is provided with a floating core storage portion 6 which is connected to the main cavity 1 and stores the floating core 2 moved by the pressurized fluid, an auxiliary cavity 10 which stores a molten resin discharged from the main cavity 1 and the floating core storage portion 6, communication passages 7 and 9 which communicate the floating core storage portion 6 and the auxiliary cavity 10 with each other; and an opening and closing means 8 that opens and closes the communication passages 7 and 9 by sliding movement. In the hollow body molding device, each inlet cross-sectional area B of the communication passages 7 and 9 is B<πA²/4 (A is the maximum diameter of the floating core 2).

The invention discloses a preparing method for a particle reinforcement aluminum matrix composite large-size thick-wall pipe material and belongs to the technical field of preparing of metal matrix composite pipe materials. According to the preparing method, reinforcement particles and aluminum alloy powder are evenly mixed according to a certain proportion; obtained mixed powder is packaged in a cold isostatic pressing sheathing assembly to be subjected to cold isostatic pressing forming, and a pipe blank is formed; the cold pressing pipe blank is subjected to vacuum gas removing, then hot isostatic pressing densifying is conducted, and a completely-dense pipe material is prepared; and finally the composite pipe material is obtained through machining. The prepared large-size thick-wall pipe material has the beneficial effects of being light, high in strength, high in modulus and the like, in addition, the quality is stable, the cost is low, and the large-size thick-wall pipe material can be widely applied to high-strength and light large-size pipes in the fields of aerospace, automobiles, advanced weapons and the like.

The invention relates to a method for preparing a quartz needle by etching a capillary tube by hydrofluoric acid. The method specifically comprises the steps of removing polymer coating from a to-be-etched position of the capillary tube; then fixing the capillary tube on a designed apparatus (figure 1); and adding a certain volume of hydrofluoric acid to etch the capillary tube until the capillary tube is broken due to etching. A conical surface is formed in the etched position of the quartz capillary tube due to a volatilization effect of the hydrofluoric acid and an affinity interaction with the surface of quartz. The method can be widely applied to preparation of quartz materials, the outer diameters and conical surfaces of which need to be controlled, used in the fields of a mass spectrum electronic injection needle, a genetic engineering micro-injection needle and the like.

The invention discloses to a manufacturing method for a high-precision composite cloth guide roller body which relates to the technological field of textile, plastic, paper making and leather making, and the like, and more particularly relates to the technological field of textile printing and dyeing equipment. The invention comprises the following steps: a stainless steel external roller body and a cold rolled sheet roller body are rolled and welded respectively to form a stainless steel external roll blank and a cold rolled sheet roll blank; the cold rolled sheet roll blank is sheathed in the stainless steel external roll blank to make a double layer roll blank, and the spin-drawn forming is carried out at last. The method is the manufacturing method for the composite cloth guide roller body with good quality, reliable performance, low energy storage and high precision.

The invention provides an improved structure of an air bearing, and the improved structure is a porous air bearing which comprises a porous body and a throttling layer part; the porous body is provided with a base part and an air chamber arranged on the base part, and is formed by enabling a plurality of gaps inside the base part to communicate with one another; the throttling layer part is arranged on one side end surface of the porous body, and is composed of an aluminum layer and a plurality of through holes with predetermined length; the through holes separately penetrate through the aluminum layer in the same direction relative to each other, and communicate with the air chamber. In order to increase, degree of freedom of regulation, on hole diameter parameters, of a porous material, double-layer limitation of the porous material, the through hole aluminum layer and the like is matched with through holes which are distributed in equal rectangular array and nano-scale hole diameters, so that hole uniformity, permeability consistency and isotropy are guaranteed; and meanwhile, bearing force, gas film stability and static rigidity are increased.

The invention provides a preparation method and device for an alloy tubular product with controllable diameter and wall thickness. The preparation device comprises a liquid alloy melt generating unit,a mould and a tubular product forming component. The mould is provided with a mould cavity. The tubular product forming component is installed in the mould cavity so that a cavity for preparing the alloy tubular product is formed between the outer surface of the tubular product forming component and the inner surface of the mould. The liquid alloy melt generating unit can provide a liquid alloy melt to the cavity so as to prepare the alloy tubular product. The liquid alloy melt can be adhered to the inner surface of the mould and/or the outer surface of the tubular product forming component.The method comprises the following steps: providing the liquid alloy melt for the cavity so as to prepare the alloy tubular product, and separating the alloy tubular product from the mould. The preparation method and device can be used for preparing the alloy tubular product with the controllable and uniform diameter and wall thickness, especially a non-crystal alloy tubular product.

The invention relates to a prestressed thermal insulation oil casing. The prestressed thermal insulation oil casing is characterized by comprising an outer tube, a middle tube and an inner tube which are sleeved at intervals, wherein an internal thread is processed on one end of the middle tube, an external thread is processed on the other end of the middle tube, one end, which is provided with the internal thread, of the middle tube is welded with the outer tube at a tube end, and is welded with the inner tube at a reserved internal thread length position, one end, which is provided with the external thread, of the middle tube is welded with the outer tube at a reserved external thread length position, and is welded with the inner tube at a tube end; an annulus, which is formed by the outer tube and the middle tube, is filled with a thermal insulation material, and is vacuumized so as to form a first thermal insulation layer, after an annulus, which is formed by the middle tube and the inner tube, is vacuumized, inert gas is filled so as to form a second thermal insulation layer; the prestressed thermal insulation oil casing comprises the following production steps of pretreating three tubes, sleeving and welding the inner tube and the middle tube, treating the annulus of the inner tube and the middle tube, sleeving and welding the outer tube and the middle tube, treating the annulus of the outer tube and the middle tube, testing a visible heat conductivity coefficient and processing screw threads on two ends of the middle tube in sequence. The prestressed thermal insulation oil casing is provided with three layers of steel pipes and two layers of thermal insulation structures, so that the prestressed thermal insulation oil casing has good thermal insulation performance and excellent working performance.

The invention relates to a manufacturing method of a low-melting-point glass optical fiber perform coating sleeve pipe. The method belongs to the technical field of glass optical fiber manufacturing. The method is characterized in that the preparation of the coating sleeve pipe comprises the steps that: (1) low-melting-point glass is molten, cooled, and crushed; and the glass is preserved for later use; (2) the low-melting-point glass is weighed and placed in a quartz tube; (3) the loaded quartz tube is vacuumed and sealed; (4) the sealed quartz tube is heated in a rocking furnace, such that the glass in the tube is molten into liquid; (5) an electric furnace rocking switch is tuned on, such that the glass liquid is well mixed; (6) the electric furnace is opened, the quartz tube is rapidly fetched and horizontally placed in a rotation device; the quartz tube is fixed, and high-speed rotation is carried out; (7) the quartz tube is fetched, and is rapidly annealed in an annealing furnace; and (8) the quartz tube is cracked, such that the coating sleeve pipe obtained. The method has the advantages that the manufactured coating sleeve pipe has smooth and non-polluted inner surface, controllable inner and outer diameters, and no bubble and line inside.

The invention discloses a threaded pipe pulling device. The threaded pipe pulling device comprises a first chuck, a second chuck, a plurality of groups of pulley components and a fixing part. The circumferential outer walls of pulleys of the pulley components surround to define a chamber body communicating with a first through hole; and the front end, far away from the second chuck, of the fixingpart forms a start position rolling region with the pulleys when extending into the chamber body with the second chuck. The threaded pipe pulling device is not provided with a lining core and a core head which are used for supporting the inner wall of a pipe, so defects such as friction marks or scratches are not formed on the inner wall of the pipe in a pipe pulling process; when the pulleys areused for rolling screw threads at a start position, as the front end of the fixing part extends into the chamber body in order to support the inner wall of the position of start rolling screw threadsof the pipe, the inner diameter of the pipe is prevented from being immediately reduced when the pulley form screw thread position rolling at the start position of the pipe; and thus the inner diameter of a pulled threaded pipe is uniform at different positions.

An improved pile hammer provides a cylinder, such as one with a uniform interior diameter wall and uses a piston ram to cycle up and down therein to contact an anvil on a downstroke. The anvil preferably provides a cavity to both lessen the weight and improve upward force on the ram for the upstroke. An air inlet is preferably located above an air outlet which was not possible with prior art designs. An air reservoir can be located above and external to the wall in the cylinder.

The present invention relates to a linear motor for a linear compressor that improves efficiency of a motor and simplifies a assembling process for a lamination by which the lamination is fixed by a fixing ring not by a welding process and lead wires are securely disposed. In a linear motor for a linear compressor, wherein there are an outer lamination and an inner lamination which is wound by a coil connect to lead wires and supported by inner coil springs, the linear motor also includes: a lamination wherein protruding portions respectively having a caulking groove are formed at concentric circles of radially arrayed iron pieces; and a non-magnetic fixing ring caulked in the caulking groove for preventing the iron pieces from being loosened.