Details of installation, positioning and clamping of parts on boring tool
Before the parts are installed on the boring tool, except that the 36H7 and 60H7 holes are not machined, the rest of the parts to be machined shall be fully machined according to the drawing requirements and process requirements to ensure accurate and reliable installation on the boring tool. The specific installation, positioning and clamping methods are as follows:
1、 Positioning datum plane
One, two and three sides are selected as the locating surface of the part, of which one and two are the joint surfaces of the part assembly installation, and three are the device base surfaces required by the process (Figure 2-88) The parts are installed on the supporting surface and orientation block of the file. Due to the irregular contour, two floating roller support pins are also designed on the striker for initial positioning. See Figure 2-89 for details
2、 Guide device
The parts are installed behind the guide device, which is guided by a single side front double support mode. The impact sleeve does not turn square with the boring bar. The boring bar and the main shaft of the file machine are elastically connected. The boring bar rotates and moves the feed in the m sleeve
3、 Clamping device
There are three clamping positions of the part in the boring tool (Fig. 2-89). The main clamping position is composed of pressing bolts and hinge structure pressing plates, followed by a clamping device composed of two hook screws, one clamping screw and two pressing plates, so that the first and second sides of the part are firmly attached to the orientation block.
4、 Machining of 36H7 and 6OH7 holes
In order to meet the technical requirements of the drawing, machine the 36H7 and 60H7 holes with the impact tool as shown in Fig. 2-89 The sequence of machining steps is shown in Fig. 2-90 Mirror Hole System Diagram, and Fig. 2-90a is the sequence of machining Lak 36H7 holes. 36H7 is a solid hole. First drill 25 holes. After twice reaming, the size is $35.8. Use sox to cutter plate to mark the sand end of 36H7 hole to meet the requirements. Finally, use an integral cylindrical reamer to ream the hole Y - i36H7. And use a 036H7 plug gauge for comprehensive inspection. After the 036H7 hole is qualified, loosen the worktable and turn it back 60. Adjust the axis position of hole 60117 according to the guide device bracket hole on the tool, and fasten the worktable after adjustment. Add III Lak 60H7 holes in the sequence of locking holes as shown in Fig. 2-90 b, which are pre cast; For the 50mm blank hole, first use the single side loose cutter head to enlarge the blank hole to 056mm, then use the reaming drill to enlarge it to 4559.8mm, finally use the special 4060H7 reamer to ream the hole to the requirements, and use the 4P60H7 plug gauge to conduct a comprehensive inspection. After processing, remove the parts and maintain the collider and auxiliary tools to process another part.
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In fact, it is difficult to solve the problem of whether a three-axis CNC machining center is better or a four-axis machining center is better. There is only a problem that is not suitable for machining some kinds of parts. Basically, all three-axis machining centers can process the parts that can be processed by a four axis machining center, while the parts that can be processed by a four axis machining center may not be processed by a three-axis machining center.
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