39results about How to "Accurate roundness" patented technology

A method of manufacturing a yoke includes a step of cutting a steel plate into a rectangular sheet having a plurality of first dovetail convexities at one end thereof and a plurality of second dovetail convexities at the other end, a step of rolling the rectangular sheet into a cylinder to fit the first dove tails and the second dove tails to each other and a step of punching border portions of the first dove tails and the second dove tails. The second dovetail convexities are formed to be the same in shape as the first dovetail convexities so that they can fit to the first dovetail convexities. A smooth-faced yoke can be manufacture without using an expensive welder.

The invention discloses a rolling machine for a wheel rim. The rolling machine comprises a rotating device for fixing and rotating the wheel rim, the rotating device is arranged on a machine frame, fine machining mounting frames are arranged on the periphery of the rotating device, an end grinding unit and side grinding units are arranged on the finish machining mounting frames, and the end grinding unit, the side grinding units and the rotating device are matched with the outer surface, the inner surface and the end surface of the grinding wheel rim correspondingly; each of the end grinding unit and the side grinding units comprises a sliding table assembly, a telescopic arm is arranged on a sliding platform of each sliding table assembly, and a rolling head is installed on each telescopic arm; and the number of the side grinding units is two and the two side grinding units are arranged on the two sides of the radial direction of the rotating device correspondingly. According to the rolling machine for the wheel rim, the processing precision is high, processing is comprehensive, and the processing efficiency can be effectively improved.

A sportsball includes a barebone ball and an outer ball cover. The barebone ball includes an inflatable bladder body and a ball casing. The ball casing, which is formed in an integrated structure, has an outer circumferential surface, an inner circumferential surface to define an interior cavity to fittingly enclose the bladder body therein, and a plurality of pre-formed channels integrally and indently formed on the outer circumferential surface, such that the ball casing and the bladder body enclosed therewithin form a one piece integrated semi-product of the sportsball. The outer ball cover comprising a plurality of outer cover panels overlapping on the outer circumferential surface of the ball casing at a position that edges of each of the outer cover panels are aligned with the corresponding pre-formed channels respectively.

An optical connector including a hollow, cylindrical shroud having a section, a bore defined within the section, the bore being adapted to fit an optical fiber connector therein and allow the same to plug or unplug a predetermined number of times, the bore being terminated at a bottom opening of the section; a cylinder axially extended a predetermined distance from a center of the bottom of the section, the cylinder having a longitudinal hole with an optical fiber fitted therein wherein a precise circularity in each of the bore and the hole and coaxial characteristics of the same are obtained by forming the shroud and the cylinder by electrical casting; and an annular flange formed integrally in a bottom of the shroud by electrical casting or injection molding, the flange being adapted to fasten a laser diode element or light detection element.

A video display device is provided with a video conversion circuit for extending an inputted video signal in horizontal and / or vertical directions, and a display unit including a display screen whose aspect ratio is longer in the horizontal direction than 16:9 and adapted to display the video extended by the video conversion circuit. The video conversion circuit includes a mode for extending the inputted video at a scaling factor of A, which is equal to or larger than 1, in the horizontal direction and at a scaling factor of B, which is equal to or larger than 1, in the vertical direction, so that videos effectively utilizing the aspect ratio of the video display device can be displayed while reducing incongruous feeling caused by the extension in the horizontal direction. Thus, an increase in the number of screen modes can be minimized, and modes capable of giving a remarkable sense of presence and modes capable of displaying right circles can be provided in the video display device with an aspect ratio of, e.g. 10:3.

The invention discloses a method for manufacturing a concrete cylindrical template. The method relates to corrugated pipes, a plurality of horizontal hoops and a plurality of vertical wooded keels. The two symmetrical corrugated pipes are well arranged in a cylindrical mode, the middle of each corrugated pipe is sleeved with the corresponding horizontal hoop, the vertical wooden keels are placed between the horizontal hoops in parallel to wrap the corrugated pipes, and the vertical wooden keels are sleeved with a plurality of horizontal hoops from top to bottom. According to the method, the cylindrical template is made from high-density polyethylene and has the advantages that the weight is low, the strength is high, the rotating rate is high, the inner surface is smooth, tenacity is good, and purchase transportation is convenient. The number of construction joints is small, flatness is high, contact between vertical joints is tight, and leakage is avoided. The template can be free of joint in the horizontal direction besides the two symmetrical joints in the vertical direction, the surface of poured concrete is smooth, color is consistent, roundness is accurate, and the vertical error is small. Forming is easy to achieve, assembly and disassembly are convenient, and work efficiency is high. Complicated external supporting systems are not needed, and maintenance and clearing are convenient to achieve after disassembly.

The invention provides an automatic roundness correction device, comprising a fixed plate (3) and a concave template (7), the vertical correction punch (12) is installed on the fixed plate (3), and the concave template (7) ) is installed with a mandrel fixing seat (21), and a rotatable mandrel (18) is installed on the mandrel fixing seat (21), and the mandrel (18) is located directly below the vertical correction punch (12), and the A rotary positioning mechanism is installed on the fixed plate (3) and the concave template (7) and behind the mandrel (18). This device uses the cooperation of the gear and the rack in the rotary positioning mechanism to stably control the rotation of the mandrel driven by the orientation shaft. , so that the roundness of the round tubular parts is accurate, the production process is effectively simplified, and the productivity is improved.

A method for fabricating a monolithic color wheel. The method includes (a) preparing a square transparent substrate; (b) forming a plurality of color filters on the square transparent substrate; and (c) cutting the square transparent substrate and the color filters together along a circular path, to form a color filter disk. Through these steps, a color filter disk of color wheel can be produced with better dynamic equilibrium quality, and will run more quietly and smoothly.