3results about How to "Improve hole reaming effect" patented technology

The utility model discloses an underground while-drilling PDC (Polycrystalline Diamond Compact) micro-reaming drilling tool which comprises a pipe body, two sides of the pipe body are respectively connected with a female buckle and a male buckle, the outer side wall of the pipe body is fixedly connected with a plurality of PDC reaming pieces, the PDC reaming pieces can cut a well wall under the action of centrifugal force in the drilling process, so that the diameter expansion is realized, and the drilling efficiency is improved. Meanwhile, in the process of lifting and lowering a drill column, forward reaming or backward reaming can be achieved, slight dog legs are eliminated, a rock debris bed is stirred, the two containing barrels are detachably arranged on the two sides of the pipe body respectively, the multiple supporting air bags are linearly distributed on one side of each containing barrel, and the supporting assemblies are arranged on the two sides of the pipe body respectively. The supporting assemblies are arranged between the containing barrels and the adjacent supporting air bags. According to the downhole while-drilling PDC micro-reaming drilling tool, the abrasion condition of the PDC micro-reaming drill bit during transportation can be reduced conveniently, and therefore the reaming effect of drilling can be improved conveniently.

A medical stainless steel tube chambering device comprises a grab handle device, a limiting device connected to one end of the grab handle device and a chambering device connected to the other end of the grab handle device, external threads are arranged on the head of the grab handle device, a connecting hole is formed in the tail of the grab handle device, and a set of sliding grooves are formed in three grooves formed in the head of the grab handle device in an annular array. The set of sliding grooves comprises two sliding grooves, a sliding block is connected into each sliding groove in a sliding mode, a hinge joint is arranged on each sliding block, the limiting device comprises three limiting clamps, the three limiting clamps are matched with one another, limiting parts in the limiting clamps are connected with connecting parts, and hinge joint holes are formed in the connecting parts and matched with the hinge joints; the center of the reaming device and the center of the limiting device are located on the same center line, the reaming device is connected to the tail of the grab handle device, and the reaming end of the reaming device penetrates through and extends into the grab handle device through the connecting hole, so that in the reaming machining process of the stainless steel pipe fitting, the production cost and the machining error are reduced, and the reaming effect is improved.

The application discloses a 1300MPa or above grade cold-rolled steel plate with high elongation and high hole expanding performance, which contains Fe and inevitable impurity elements, and also contains the following chemical elements with mass percentage as follows: C: 0.15%-0.30%, Si: 0.3%-0.5%, Mn: 1.8%-2.5%, Al: 0.01%-0.03%, B: 0.001-0.003%, Ti: 0-0.05%, and the mass percentage of C and Mn satisfies C+Mn / 6>=0.52; wherein the microstructure of the cold-rolled steel plate has nano precipitates with an average diameter less than 30nm. In addition, the application also discloses a manufacturing method of the above-mentioned 1300MPa or above grade cold-rolled steel plate, which comprises the following steps: (1) smelting and casting; (2) hot rolling; (3) hot coil heat preservation cover annealing; (4) cold rolling; (5) annealing; (6) isothermal heat preservation treatment; (7) cooling; (8) flattening.