CN201493529U - Radial Offset Mechanism of Helical Milling Device - Google Patents

Abstract

The utility model discloses a radial offset mechanism of a helical milling hole device, which comprises an outer sleeve with circular inner and outer contours, an inner sleeve with a circular inner contour and an elliptical outer contour sheathed in the outer sleeve. Sleeve, the inner sleeve is provided with a worm gear, and an adjusting lead screw whose one end is installed on the outer sleeve is arranged between the inner and outer sleeves, and the adjustment lead screw and the worm wheel are connected to each other Engaged with each other, a locking screw is provided on the outer sleeve, and one end of the locking screw can be pressed against the end surface of the inner sleeve. This device cleverly utilizes the characteristics of the inner and outer contours of the inner and outer sleeves, and adjusts the radial offset by adjusting the relative rotation between the inner and outer sleeves. This mechanism not only ensures the processing accuracy, but also greatly saves space.

Description

Radial Offset Mechanism of Helical Milling Device

technical field

The utility model relates to a helical hole milling device, in particular to a radial offset mechanism of the helical hole milling device.

Background technique

Now our country is in a period of rapid development of manufacturing technology. As the main basic technology of manufacturing technology, cutting processing has made great progress with the development of manufacturing technology. It has entered the stage of developing high-speed cutting, developing new cutting technology and processing methods, A new stage of development characterized by the provision of a complete set of technologies. Aerospace is one of the most important components of the manufacturing industry and the industry with the most high-tech enrichment. In aviation manufacturing, a large number of parts need to be assembled, and thousands of holes need to be processed. To achieve efficient, high-precision, and high-quality processing of such aviation assembly holes, a new technology is needed to replace the traditional drilling technology. .

Aviation manufacturing equipment design, manufacturing technology and high-strength composite material manufacturing and processing, aluminum-titanium alloys are widely used in the aviation field, and a large number of riveting is required in aviation assembly. Therefore, in the manufacturing process, there will be a large number of holes with different specifications to be processed. The diameter of the hole is generally 6-15mm. In the traditional drilling process, the linear speed of the spindle center is zero, that is, the center of the drill bit does not participate in cutting, and the removal of workpiece material in this central area depends entirely on the downward movement of the drill. It is extruded by the thrust, so the Z-direction force that the drill bit bears during drilling is very large. When processing high-hardness materials such as titanium alloys, rapid wear and failure of the tool is a common phenomenon. In addition, the traditional drilling process is a continuous cutting process, the blade is always in contact with the workpiece, the temperature of the contact surface between the blade and the workpiece is very high during cutting, and the thermal conductivity of titanium alloy is relatively poor. The cutting process leads to the accumulation of temperature, which will also Accelerated tool wear failure leads to a decrease in the quality of the machined surface. In the existing aerospace processing and manufacturing assembly, the drilling process is generally a process of pre-drilling, roughing, and then finishing, removing burrs and improving the processing quality of the holes. Since the size of aerospace workpieces is generally relatively large, this requires that the processing range of the machine tools required for this processing must be large. Because helical milling is a new type of mechanical processing technology for aerospace processing, there is no such mechanism for radial offset.

Contents of the invention

The purpose of the utility model is to overcome the shortcomings of the prior art, and provide a radial offset mechanism of a helical milling device capable of ensuring machining accuracy and saving space.

The radial offset mechanism of the spiral milling device of the present utility model comprises an outer sleeve whose inner and outer contours are both circular, and an inner sleeve whose inner contour is round and whose outer contour is elliptical, which is sleeved in the outer sleeve. , the inner sleeve is provided with a worm gear, and an adjusting lead screw whose one end is installed on the outer sleeve is arranged between the inner and outer sleeves, and the adjustment lead screw and the worm gear are connected to each other. Engagement fit, a locking screw is arranged on the outer sleeve, and one end of the locking screw can be pressed against the end surface of the inner sleeve.

The advantages of the utility model device: the size of the riveting hole in the aviation field is 6-15mm, so the maximum radial offset distance is 4mm, and the general mechanism cannot meet the guarantee of processing accuracy, but this mechanism cleverly uses the inner and outer sleeves. The characteristics of the inner and outer contours, by adjusting the relative rotation between the inner and outer sleeves, thereby adjusting the radial offset, this mechanism not only ensures the machining accuracy, but also greatly saves space.

Description of drawings

Fig. 1 is a structural schematic diagram of the radial offset mechanism of the helical milling device of the present invention;

Fig. 2 is a schematic diagram of the locking structure between the inner and outer sleeves of the device shown in Fig. 1 .

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in detail.

As shown in the accompanying drawings, the radial offset mechanism of the utility model helical milling device includes an outer sleeve 7 whose inner and outer contours are all circles, the inner contour enclosed in the outer sleeve 7 is a circle, and the outer contour is Ellipse inner sleeve 6, described inner sleeve is provided with worm gear 8, is provided with its one end to be installed on the adjustment lead screw 5 on the outer sleeve between described inner and outer sleeve 6,7, described adjustment The lead screw 5 and the worm wheel 8 are engaged with each other, and a locking screw 4 is arranged on the outer sleeve, and one end of the locking screw 4 can be pressed against the inner sleeve 6 on the end face.

The working principle is as follows: when the system is working, the outer sleeve and the inner sleeve rotate around the center at the same time, and the two are tightened by locking screws, and there is no relative rotation between the two. In this way, the eccentricity of the tool does not change, and this tool can process holes of the same size that are larger than the tool diameter. When the size of the hole to be processed changes, it is necessary to adjust the distance from the tool centerline to the frame centerline. The adjustment of the radial offset distance is realized by the relative rotation of the inner sleeve and the outer sleeve. The external contour of the outer sleeve is a circle, and the internal contour is also a circle, but the external contour of the inner sleeve is an ellipse, and the interior is a circle, and is matched with the bearing. The rotation of the inner sleeve and the outer sleeve is realized by adjusting the lead screw between the inner and outer sleeves, and the cooperation of the inner and outer sleeves is realized by locking screws. The specific principle is shown in Figure 1, where d in Figure 1 refers to the radial offset distance, and the radius of the machining hole 9 is the sum of the tool radius and d. When the inner sleeve 6 rotates relative to the outer sleeve 7, d will change, thereby changing the diameter of the hole that can be processed, and achieving the purpose of radial adjustment.

Claims (1)

1. the radial offset mechanism of helical milling device, it is characterized in that: it comprises that inside and outside contour all is that the outer sleeve of circle, the interior profile that is enclosed within the described outer sleeve are oval inner sleeve for circle, outline, described inner sleeve is provided with worm gear, between described inside and outside sleeve, be provided with the one end and be installed in adjusting leading screw on the outer sleeve, the cooperation that is meshed each other of described adjusting leading screw and described worm gear, described outer sleeve is provided with lock screw, and an end of described lock screw can be pressed on the end face of described inner sleeve.

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