Best Skills for Your Drilling Parts - Case

In production practice, many valuable experiences cannot be learned from books. In order to make the majority of skilled talents and process technicians avoid detours in the process of ability improvement, Tuofa CNC Machining has opened a "projects-case" column, which brings together Chinese labor model Meng Xiangzhi and Meng Xiangzhi's national skill masters and core members of the labor model studio. The accumulated valuable experience covers the special operation method of turning processing, the structural design of special fixtures, etc., as well as the actual cases summarized when solving actual production problems. Let's start with turning today and see how the CNC masters work.

 

 

 

Machining operation method of deep hole parts center tube

 

Technical field: The operation method specifically relates to a processing method of a center tube of a deep hole part. The floating boring tool is designed, and the deep hole machining is completed through the design innovation of the vibration damping tool holder and auxiliary devices.

 

BACKGROUND OF THE INVENTION In numerical control machining services, the machining method is applied to the field of batch turning machining and manufacturing of high-precision deep-hole parts.

 

Contents of operation method: The center pipe of oilfield drilling equipment is a deep hole part, and the inner diameter of the part has 3 specifications: φ55 picture mm × 1200 mm, φ57 picture mm × 1200mm and φ59 picture mm × 1200mm, and there are hollow knives in the deep holes, 15° transition chamfer, etc. Qualified products can be processed by designing and manufacturing the floating vibration damping tool bar and reasonable structure size and angle of the tool block, and rationally arranging the processing procedures.

 

Take a part with a size of φ55 mm × 1200 mm as an example, as shown in Figure 1-1. The structure and dimensions of the corresponding tool holder are shown in Figure 1-2, and the dimensions of the cutter block are shown in Figure 1-3.

 

Figure 1-1 Parts

 

 

Figure 1-2 Tool holder structure

 

 

Figure 1-3 Knife block

 

 

 

The schematic diagram of parts processing is shown in Figure 1-4. Among them, the size of the bakelite vibration damping pad is shown in Figure 1-5. The structure of the removable sealing end cap is shown in Figure 1-6.

 

Figure 1-4 Processing schematic

 

 

1—Removable sealing end cover 2—Bakelite damping pad 3—Knife block 4—Workpiece 5—Cutter holder 6—Pipe joint 7—Rubber hose

 

 

Figure 1-5 Bakelite vibration damping pad

 

 

Figure 1-6 Removable sealing end cap

 

 

1—top center 2—sealing cover 3—screw 4—seal rubber gasket 5—topping screw 6—workpiece

 

 

Before machining, use a dial indicator to align the top line and side line of the tool bar (φ40 picture mm), and use the vernier height caliper to detect the tool bar at the same time, so that the center line of the tool bar is the same height as the spindle rotation center.

 

 

Due to the support of the bakelite vibration damping pad, the rigidity of the tool bar is increased, and the cutting vibration caused by the longer cutting edge of the tool block is eliminated.

 

 

When machining, first rough machining the workpiece, leaving a margin of 1mm for the inner hole (drilling or reaming).

 

Then rough the inner hole, clamp one end with a self-centering chuck, and support the other end with a center frame, turn the hole to φ54.7 mm in the picture, control the depth of 80mm, remove the workpiece, and make the φ54.7mm face the end of the chuck , put the center tube of the workpiece on the tool holder, then install the damping pad and cutter block (φ54.7 mm in the picture) on the tool holder, and install the removable sealing end cover on the center tube; move the tool holder to drive the workpiece, Put the workpiece in the self-centering chuck and clamp it, support the other end with the center frame, adjust the speed to 63r/min, the feed rate to 0.4mm/r, adjust the flow rate of the cooling pump to the maximum, reverse the tool, and perform turning . The bakelite vibration damping pad is designed in the shape of three equal grooves, which not only plays a supporting role, but also enables the chips to be discharged smoothly under the action of the large flow of cutting fluid.

 

Next, fine turning the inner hole, the processing method is similar to that of the rough turning inner hole. First, the inner hole turning tool is used to turn the hole to φ55 picture mm, as the guide hole of the tool block (the size of the tool block is φ55 picture mm), and the control hole depth is 80mm. . Cutting parameters: the workpiece speed is 40r/min, and the feed rate is 0.4mm/r.

 

 

 

Process characteristics of deep hole machining:

 

(1) The problem of insufficient rigidity of the tool holder for deep hole machining is better solved by using the reverse tool for turning deep holes and the function of bakelite damping pads, and the dimensional tolerance and surface quality of the holes are guaranteed.

 

(2) The use of the detachable sealing end cover enables the chips to be discharged from the hole end supported by the center frame under the action of a large flow of cutting fluid, which better solves the problem of cooling and chip removal, and solves the problem of chips entering the self-centering chuck. In the jaw, the problem of grinding and breaking the chuck also reduces the loss of cutting fluid and the pollution to the environment.

 

 

 

 

 

CNC Machining Turning Process Interpretation

 

Tuofa CNC machining centers on the special operation method of CNC turning processing, special fixtures, special measuring tools, testing and other manufacturing experience and common sense, various turning processing cases, classic solutions of CNC tools, difficult parts processing cases and product failure analysis and other aspects. The elaboration is the crystallization of the unique skills of skill master Meng Xiangzhi and the valuable practical experience of the core members of the studio for many years, which has a good role in promoting technical exchanges and promotion of achievements.