Please select the most similar patent number from A, B, C and D. Which number is?
A method for machining a housing having a side protrusion, comprising: performing stepped deep drawing on a sheet material (50) to obtain a housing having side walls (52), a bottom (53), and an opening (510), wherein rounded corners are formed between the side walls (52) and the bottom (53), and a deep-drawn step (55) having the height of a side protrusion is formed on the side wall (52); pressing the side walls (52) backward to decrease the rounded corners between the side walls (52) and the bottom (53), such that the thickness at the rounded corners subsequent to the backward pressing is sufficient for computer numerical control (CNC) machining; performing necking on the opening of the deep-drawn step (55), such that the inner side surface and outer side surface of the opening of the deep-drawn step (55) are respectively flush with the inner side surface and outer side surface of the opening of the side walls connected with the deep-drawn step (55); and performing CNC machining on the deep-drawn step (55) to obtain a housing having target dimensions. Moreover, a mold for machining a housing having a side protrusion is provided. The machining method can reduce the allowance for CNC machining, thereby decreasing the machining deformation caused by residual stresses generated by plenty of CNC machining, and meanwhile saves the sheet material, thereby reducing machining costs.
A: Provided is an easy-assembly laptop shaft, comprising a stop member (1) and a hollow housing (2). The stop member (1) is arranged in the housing (2). Openings (3) are provided at sidewalls of the housing (2) extending in the length direction of the housing (2). The opening (3) has two opposing sidewalls, both of which are provided with protruding portions (31). A protruding portion (31) of one sidewall corresponds to a gap (32) between adjacent protruding portions (31) of the other sidewall. An inner surface of the housing (2) is provided with a positioning groove (21) along a circumferential direction of the housing (2). The positioning groove (21) matches the stop member (1). The stop member can be conveniently positioned within a hollow housing of the easy-assembly laptop shaft and subsequently an opening of the housing can be soldered. Compared with a conventional soldering technique, the utility model improves processing efficiency and assembly accuracy.
B: A machining process for a large-diameter thin-walled part. The machining process comprises the steps of: S1. selecting a raw material having an appropriate size; S2, machining an inner hole (5); S3. performing shaping; S4. performing aging heat treatment; S5. semi-finishing the inner hole (5) and part of the shape; S6. semi-finishing part of the shape; S7. performing natural aging treatment; S8. finishing the inner hole (5) and a second end (8); S9. finishing a second outer circle (2) and a process step (6); S10. finishing a first outer circle (1); S11. machining and forming a flange (3); and S12. machining and forming multiple protrusions (4). According to the machining process, a stable process route is designed to control deformation, reduce the number of times of positioning and clamping, shorten the machining time, improve machining efficiency and ensure product quality; the one-time machining of all features is implemented by means of the positioning of the inner hole (5), ensuring that product deformation is within a controllable range; reasonable process parameters are used to achieve accurate production guidance work, get rid of the limitation of special person and special machine, and well implement automated production.
C: Provided are a novel thread and device, particular a thread provided with steps at the side surface to prevent a fastener from getting loose, and a bolt, screw and the like provided with the novel thread. Further provided is a machining method. The steps are located in a threaded fastening force bearing surface; the steps are unfolded from a thread root (2) to a thread top (1) and in an inverted toothed shape; the steps are located at the whole or a part of a portion between the thread root and the thread top; threads matingly engaged are each provided with an anti-loosening thread; the steps can be conveniently machined on the side face of the thread by using a bevel gear hobbing cutter.
D: A method of manufacturing a metal reinforced rim of a composite material fan blade involves separately manufacturing three parts of a metal reinforced rim (20), including a first sidewall panel (201), a second sidewall panel (202) and a nose cone (203). In a manufacturing process, an inner side surface (201a) of the first sidewall panel and an inner side surface (202a) of the second sidewall panel are separately formed. After the first sidewall panel and the second sidewall panel have been connected, an outer side surface (201b) of the first sidewall panel and an outer side surface (202b) of the second sidewall panel are connected to form a processing surface (20B) for construction of the nose cone (203) of the metal reinforced rim. The invention eliminates an additional step for processing an inner surface of a metal reinforced rim, thereby significantly reducing the difficulties of processing the inner surface of the metal reinforced rim.
Answer: B