In the single-wire tap grinder on the machine in the tap diameter shovel

The national standard GB / T969 – 94 ‘taper technical condition’ 3.8 stipulates: Thread nominal diameter greater than and equal to 3mm high performance machine taper thread tooth type should carry on shovel mill; Thread nominal diameter is bigger than and equal to 8mm ordinary machine taper thread tooth Type should be shovel grinding. Tap in the shovel grinding process is in the process, machine grinding wheel in the role of shovel grinding cam, tap in each of the blade, from the front mouth to the back of the mouth, grinding out an Archimedes spiral, forming the former (SB / K722A) on the processing has been through the thread rolling machine thread (hot before the tap thread roughing) of the tap semi-finished products. Processing conditions: single-wire tap grinder (SB / K722A) Machine taps (size range M3 – M16) in the processing of the rough sub – roughing and finishing. Roughing refers to the heat treatment before the rolling thread processing, finishing is the heat treatment after grinding thread processing. As in the roughing of the thread, is based on the positioning of the outer circle as the basis for processing, rough cylindrical cylindrical tolerance requirements within 0.05mm, rough rolling after the heat treatment process has been deformed; and in the finishing process is based on tap A center hole 60 required in the process pipeline welding machine. For the positioning of the benchmark, so that the rough, finishing the different benchmarks, coupled with the heat treatment and deformation and other factors, making the thread mill in the hanging shovel processing, the tap in the diameter of the blade, no shovels, backhoe and Shovel grinding the highest point is not in front of the flap and other phenomena. In order to eliminate this phenomenon, it must be in the middle of the shovel shovel processing preparation. A tap tool is used to classify the tap as shown in Fig. The above programming example, you can find the same idea of ​​the two programming, the same length of the program, but the second case is more than 8 times the knife, which each knife has to take the knife away, greatly reducing the processing efficiency. Therefore, in the case of ensuring the processing efficiency can be increased, you can simultaneously use the G71 and G73 instructions on the same contour surface processing, such as for non-monotonically increase or decrease the outer contour can be processed with G71 monotonically increase or decrease part of the contour, then G73 The contour of the groove portion is machined. The first two pairs of knife blocks with screws in the front bracket on the open slot, the two pairs of blocks in contact with the middle of the thread to produce a threaded hole drilling tapping machine, the thread of the parameters and roughing thread after the same thread parameters , The screw hole requires the center height to be aligned with the rear top 4 center, wherein the left pair of cutter blocks can slide along the groove of the front support plate, and the left pair of cutter blocks can be fixed with the screw with hand wheel for convenience metal punching equipment. First loosen the handwheel screws used to fix the left cutter block, slide the left cutter block outwards (see Figure 3), place the tap on the knife tool and hold it with the top 4, then Slide) to close the left cutter block 6, so that the two pairs of knife blocks on the two nuts and tap thread parts are engaged, tighten the lock hand wheel screw fixation left on the knife block, so that the right and right knife block tightly tap The blank is then rotated in reverse to the tapping direction. At this time because the tap back so that the top after the top 4 began to tighten the tap blank, until the tap rough tool in the tool on the knife rotation is not moving up busbar punching machine. According to the tap at the front edge of the edge of the block with the knife next to the center line alignment position classification.

 

For example, if the front edge of the tool is aligned with the center line of the cutter block, the tap can be grouped into the front opening, as shown in Figure 4. According to the tightening of the taper, the taps are divided into six categories, which are the front, the flap, the back, the front, the trough, the trough and the trough. (See Figure 5) will be classified after the tap placed separately, and make the mark. In the SB / K722A taper grinder on the fine thread parts, the various types of tap blanks in accordance with the location shown in Figure 5 from the front mouth to the groove after the order of sequential processing. For example, before the processing of the mouth category, in the knife tool on the knife on the chuck, the first tap in the handle of the handle and then tighten the screw to stop. Then tap the front mouth on the knife block center position, and finally tighten the chuck, chuck tight after the direction to be consistent. And then to the SB / K722A taper grinder headstock and tailstock between the two top -, before the adjustment control machine tool wheel cam, when the headstock toggle tap to the front position, the cam control wheel back away from the tap; When the headstock drives the tap to the slotted gap, the cam controls the grinding wheel to move backwards, away from the tap and into the next cycle, so that the diameter of the middle diameter of the tap can be controlled by the cam. When the headstock drives the tap from the front mouth to the back, A shovel after grinding angle. After processing the mouth class and then use the same method of processing other classes.

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