47results about How to "Improve dimensional accuracy" patented technology

The invention provides a steel structure detailed drawing labeling method based on a BIM (building information modeling) system. The steel structure detailed drawing labeling method is a 'two-dimensional code or three-dimensional code' labeling method which is based on the position of a welding auxiliary positioning plate and comprises lots of information. By labeling the position of the welding auxiliary positioning plate, a follow-up connecting plate and component production process is standard and automatic, and the size accuracy of connecting plates and the size accuracy of the components are improved greatly, so that the follow-up construction quality is guaranteed; and 'two-dimensional codes or three-dimensional codes' are inserted in a detailed drawing, the information of the connecting plates, the information of the components, the information of adjacent components and the information of parts in a whole BIM system can be taken in, and standardization and automation of the follow-up connecting plate and component production process are facilitated greatly.

A cold-rolling train comprises a plurality of rolling stands (2) through which a cold strip (1) passes in succession and a strip feeding device (3) located prior to the first passed-through rolling stand (2-1). A nulled setpoint speed (v-0*) is sent to the strip feeding device (3) so that the strip feeding device (3) feeds the cold strip (1) to the first passed-through rolling stand (2-1) at a nulled actual speed (v-0) corresponding to the nulled setpoint speed (v-0*). A first setpoint speed (v-1*) is sent to the first passed-through rolling stand (2-1) so that rolls (7-1) of the first passed-through rolling stand (2-1) rotate at a first actual speed (v-1) corresponding to the first setpoint speed (v-1*). Between the first passed-through rolling stand (2-1) and the rolling stand (2-2) passed through next is a first thickness detection device (4-1), by means of which a first actual thickness (d-1) of the cold strip (1) is detected. A base output signal (delta) is determined using the first actual thickness (d-1) and a first setpoint thickness (d-1*), said base output signal being used to adjust the first setpoint speed (v-1*), but not the nulled setpoint speed (v-0*), so that the first actual thickness (d-1) is conformed to the first setpoint thickness (d-1*). Between the strip feeding device (3) and the first passed-through rolling stand (2-1) is a nulled thickness detection device (4-0), by means of which a nulled actual thickness (d-0) of the cold strip (1) is detected. The nulled setpoint speed (v-0*) is adjusted by way of a nulled feed-forward controller (9-0) in such a way that the product is adjusted to a setpoint mass flow by the nulled setpoint speed (v-0*) and the nulled actual thickness (d-0).

The invention mainly relates to the technical field of extrusion rolling and drawing of metal wire bars, in particular to a method for rolling metal wire bars under a magnetostatic field auxiliary effect. The method is characterized by comprising the following steps: a magnetostatic field is installed in the advancing direction of metal wire bar blanks; before the metal wire bar blanks are rolled, extruded and drawn, the metal wire bar blanks are suffered from a magnetic field effect in the process of passing through the magnetostatic field area; the longitudinal center line of the metal wire bar blanks is consistent with the advancing direction thereof; and the blanks are rolled, extruded and drawn by rollers after the treatment of the magnetostatic field auxiliary effect. For multiple times of rolling, extrusion and drawing, the magnetostatic field treatment is performed before each time of rolling. The method has the following advantages: the material deformation resistance is prominently reduced; the rolling defects are reduced; the finished product size precision is high; the material mechanical performance, in particular the strength and the toughness are improved; and the synchronous reinforcement of the material toughness is realized.

The invention discloses a manufacturing method of a non-uniform crankle box girder rotary ladder. According to the construction scheme, the manufacturing method includes the steps that 1, flange plates and webs are lofted through a computer and then subjected to numerical control programming, and the flange plates and the webs are cut with plasma and discharged according to programming; 2, the flange plates and the webs are curled on a roller bed; 3, the projection contour of the rotary ladder is drawn on a bed mould, and the projection contour is divided into N equal parts corresponding to all levels of stairs; 4, the altitude differences of bisectrices relative to the stepping initial side are calculated, and a bed jig is welded to each bisectrix through profile steel according to the altitude differences; 5, bottom plates are spot-welded and assembled on the bed jigs; 6, the webs and the flange plates are spot-welded and assembled on the bottom plates; 7, top plates are spot-weldedand assembled on the flange plates and the webs, and step scribing of the levels of stairs is carried out; 8, the levels of stairs are spot-welded and assembled after discharging is completed throughnumerical control programming according to an expanded view of steps of the levels of stairs; 9, omni-bearing welding is carried out; and 10, inspection and coating are carried out. Assembly is carried out by simulating the actual mounting space structure size of the rotary profile steel ladder, the manufacturing precision is greatly improved, and the forming effect is good.

The invention discloses an automatic edge sticking device for a filter element. The automatic edge sticking device comprises a paper feeding device, a paper folding device, an edge sticking device body and a cutting device, wherein the paper feeding device conveys folded paper to the paperfolding device, the paper folding device is used for sequentially conveying the folded paper to the edge sticking device body and the cutting device, when the paper folding device is used for conveying the folded paper, the paper folding device is used for folding the current folded paper to form a pluralityof paper folding units, moreover, the edge sticking device body is used for sticking edge strips on the two sides of the current folded paper, and the cutting device is used for cutting the folded paper and the edge strips. According to the automatic edge sticking device for the filter element, the folded paper can be stably and uniformly folded, the automatic edge sticking operation can be carried out stably and uniformly, and meanwhile, the sizes of the paper folding units of each folded paper can be accurately controlled, so that the qualified rate of produced products is guaranteed, the production efficiency is improved, and the internal quality and the appearance attractiveness of the products are greatly improved.

The invention provides a composite functional prepreg material and a preparation method thereof. The preparation method comprises the following steps: carbon fibers and another kind of fibers are mixed and woven, so that mixed and woven fibers are obtained; resin is used to coat the mixed and woven fibers, thus a mixed and woven prepreg material is obtained; lay-up molding is performed on the mixed and woven prepreg material; and curing molding is performed on the mixed and woven prepreg material. The mixed and woven fiber prepreg material is used, so that the deformation quantity brought by shrinkage deformation caused by direct lamination of two kinds of single fibers is reduced, and the outline dimension accuracy of parts is improved.

The invention provides a forging process of a left half shaft of an automobile differential mechanism and relates to the technical field of forging. The forging process includes the procedures of feeding, heating, forming, edge cutting, hardening and tempering and shot blasting. A free forging drawing-out mold cavity is designed, it is guaranteed that the drawing-out mold cavity is matched with a finish forging mold cavity, a positioning device is designed and arranged on a drawing-out mold, it is guaranteed that the drawing-out mold cavity is matched with the finish forging mold cavity, and the situation that the size of a forging stock obtained after finish forging does not meet drawing requirements due to the fact that the blank making diameter is large or small is avoided. The positioning device is designed on the drawing-out mold, the axial and radial sizes of the forging stock are controlled, the product accuracy is greatly improved, multiple forging defects caused by the fact that the blank making length is large or small are overcome, effective controllability is brought to the production process, and the output per shift is increased.

The invention provides a forging process of a left half shaft of an automobile differential mechanism and relates to the technical field of forging. The forging process includes the procedures of feeding, heating, forming, edge cutting, hardening and tempering and shot blasting. A free forging drawing-out mold cavity is designed, it is guaranteed that the drawing-out mold cavity is matched with a finish forging mold cavity, a positioning device is designed and arranged on a drawing-out mold, it is guaranteed that the drawing-out mold cavity is matched with the finish forging mold cavity, and the situation that the size of a forging stock obtained after finish forging does not meet drawing requirements due to the fact that the blank making diameter is large or small is avoided. The positioning device is designed on the drawing-out mold, the axial and radial sizes of the forging stock are controlled, the product accuracy is greatly improved, multiple forging defects caused by the fact that the blank making length is large or small are overcome, effective controllability is brought to the production process, and the output per shift is increased.

The invention provides a lathe positioning device of an eccentric cylindrical machining workpiece. The lathe positioning device of the eccentric cylindrical machining workpiece comprises the workpiece, a fixing mechanism, a limiting mechanism, connecting mechanisms, a blocking mechanism and a mounting mechanism, wherein the fixing mechanism comprises a fixing cylinder and a fixing groove; the limiting mechanism comprises connecting sleeves, a first screw rod, a second screw rod and a fixing plate, the top end and the side wall of the fixing cylinder are symmetrically provided with the connecting sleeves correspondingly, the interiors of the connecting sleeves and the interior of the fixing cylinder are in threaded connection with the first screw rod and the second screw rod correspondingly, and the first screw rod and the second screw rod are mutually perpendicular to each other; one end of the first screw rod and one end of the second screw rod are rotationally connected with the fixing plate, and the fixing plate is in sliding connection with the interior of the fixing groove; and the interiors of the plurality of the connecting mechanisms are rotationally connected with the first screw rod and the second screw rod correspondingly. The lathe positioning device of the eccentric cylindrical machining workpiece can conveniently determine the eccentric position of the workpiece.

The invention discloses an extrusion forming method of an aluminum alloy door and window profile. The extrusion forming method comprises the following steps of preparing a cast ingot; cleaning an extrusion cylinder and a forming mold of an extruder; carrying out the step-by-step preheating and heat preservation treatment on the extrusion cylinder and the forming mold of the extruder; preheating anextrusion tool; utilizing the finite element analysis of a DEFORM-3D software to carry out simulated extrusion forming; correcting the forming mold; and extrusion forming, stretching and straightening. Before extrusion forming, the corresponding preheating, heat preservation and cleaning treatment is carried out on the extrusion cylinder, the forming mold and the extrusion tool of the extruder, so that the surface quality of the formed aluminum alloy door and window profile can be effectively improved. The forming mold is subjected to the related analysis through the finite element analysis of the DEFORM-3D software before the formal extrusion forming, so that the influence of the parameter problem of the forming mold on the forming quality can be effectively avoided, and the size accuracy of the extrusion forming can be improved.

The invention discloses an automatic edge attaching edging device for a filter element of a filter. The device consists of a paper feeding device, a paper collecting device, an edge attaching device body and a cutting device, wherein a paper folding induction device is arranged at a part, close to the cutting device, of the rear section of the edge attaching device body; an adjustable end head ofan interval adjustable part of the paper collecting device is clamped by a mechanical arm, and the position of the mechanical arm is controlled by a screw rod; a glue outlet of a gluing device is a strip-shaped notch with an included angle of greater than 15 degrees but less than 165 degrees with a horizontal plane; the cutting device is arranged on a frame of the edge attaching device body and consists of a horizontal sliding mechanism, a vertical sliding mechanism and a disc knife driving mechanism; meanwhile, the paper feeding device is provided with a vertical adjusting device; the paper collecting device is provided with an up and down and front and back adjusting device; and the edge attaching device body is provided with a left and right adjusting device connecting with a left and right moving mechanism of the paper collecting device and a left and right moving mechanism of the cutting device. By means of the device, size accuracy of each product can be well controlled, the qualified rate of products is guaranteed, and the production efficiency is improved.

The invention relates to a casting deformation preventing device which comprises a cast-in pipe and control assemblies. An expansion space is formed in the side wall, close to the insert casting pipe, of a sand mold, each end, close to the cast-in pipe, of the sand mold is at least provided with a group of containing cavities and a molten metal channel, and the corresponding containing cavities are communicated with a mold cavity through corresponding molten metal channels. The control assemblies are arranged on the cast-in pipe, and the control assemblies are located in the containing cavities. One part of each control assembly is rigidly connected with the cast-in pipe, and the other part of the control assembly elastically abuts against the inner wall of one side of the corresponding containing cavity. The casting deformation preventing device device can automatically, directionally and quantitatively control the expansion movement of the cast-in pipe in the cast-in casting, is easy to operate, and ensures that the cast-in pipe is not prone to deformation in the cast-in process of the casting, so that the deformation of the casting is avoided; and the size accuracy is high, and the size and use requirements of casting are guaranteed.