CN201735837U - Tool fixture assembly capable of adjusting depth of step drill - Google Patents

Abstract

The utility model discloses a tool holder assembly capable of adjusting the drilling depth of a step, which comprises: a drill bit; a hollow reaming tool, which is set in the middle of the drill bit and fixedly arranged with the drill bit; The head of the hole cutter is provided with a blade, and the tail is provided with an external thread; a fixture is sleeved on the tail of the drill through its through hole, and the head of the fixture is also provided with a threaded counterbore, and the fixture is connected to the threaded counterbore through the threaded counterbore. The tail of the reaming tool is threaded; a locking nut tightens the head end surface of the clamp and is threaded with the tail of the reaming tool. The combination can reduce the machining process of the counterbore, shorten the machining time and improve the working efficiency.

Description

Tool holder assembly with adjustable step drilling depth

technical field

The utility model relates to a machining tool, in particular to a drilling tool.

Background technique

In the actual processing operation of various drilling, the drilling operator often needs to use drill bits of different diameters to drill the counterbore when drilling and counterboring. Drilling a counterbore requires three times of entering and withdrawing the tool to complete. At present, the tools used in drilling processing include: forming drills and fixed step drills. The problem with the above two drilling tools is: when machining countersinking holes with different radii on the same center, the machining tool cannot adjust the height of the tool according to the depth of the countersinking hole, and the front and rear edges of the machining tool, that is, the cutting edge of the small hole And the cutting edge for processing large holes cannot reach the designated station at the same time, so the work efficiency of counterbore processing is very low.

Contents of the invention

The purpose of this utility model is to provide a tool holder assembly with adjustable step drilling depth, which is used for processing two or more large and small counterbores with the same center and different radii 1. The depth control of the small counterbore can be realized by adjusting the tool before processing, so that the processing blade of the tool reaches the designated station at the same time. Using the tool holder assembly to process the counterbore can reduce the processing procedures, shorten the processing time and improve work efficiency.

In order to achieve the purpose of the above invention, the utility model provides a tool holder assembly with adjustable step drilling depth, which includes:

a drill;

A hollow reaming tool, set in the middle of the drill bit, and fixedly arranged with the drill bit, the head of the reaming tool is provided with a blade, and the tail is provided with an external thread;

A clamp is provided with a through hole, and the clamp is sleeved on the tail of the drill bit through the through hole. The head of the clamp is also provided with a threaded counterbore, and the clamp is connected with the reaming tool through the threaded counterbore. tail screw connection;

A locking nut is pressed against the head end face of the clamp and is threadedly connected with the tail of the reaming tool.

Preferably, the tail of the clamp is a cone, the cone is provided with a number of axial grooves, and an external thread is provided next to the cone along the axial direction of the clamp, and a fixing nut passes through the inside of the front end of the clamp. The thread is connected with the external thread at the end of the fixture, and is connected with the tapered body at the end of the fixture through the tapered hole at the rear end.

In addition, the fixture described in the utility model can also be fixed and locked by other methods such as column pin fixing, and is not limited to the above-mentioned method of cooperation of the fixing nut, the cone and the external thread.

When the combination is in use, the relative position of the reaming tool and the jig can be adjusted by rotating the clamp, thereby adjusting the height of the tool during drilling. When the tool is adjusted in place, tighten the lock nut to position the reaming tool. The thread design and taper design at the end of the clamp are used for locking and positioning the clamp itself when the end of the drill bit is connected to the rotary drive mechanism, preventing the clamp from being separated from the drill bit. When processing two concentric countersinking holes with different radii, large and small, the drill bit implements small-radius drilling on the workpiece. When the blade of the reaming tool touches the surface of the workpiece, it is reamed and cut, thereby realizing the precision of counterbore processing. Formed in one go.

The utility model adopts the above-mentioned design, so that the counterbore that needs multiple processes to be processed can be formed at one time, which greatly reduces the processing time and improves the production efficiency.

Description of drawings

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of a tool holder assembly capable of adjusting the step drilling depth in a typical embodiment of the present invention.

Fig. 2 is a split structure diagram of Fig. 1 .

Fig. 3 is a structural schematic diagram of the reaming tool in the utility model.

Detailed ways

It should be understood that this embodiment is only a typical implementation of the tool holder assembly with adjustable step drilling depth described in the present utility model, and is not intended as a limitation to the technical solution described in this embodiment.

As shown in Figures 1 and 2, the toolholder assembly includes: a twist drill 1, the middle of which is covered with a reaming tool 2, and the two are fixedly connected through pin holes and pins arranged thereon, that is, when the twist drill 1 rotates , the reaming tool 2 also rotates synchronously. The clamp 4 is sleeved on the tail of the twist drill 1 through its central through hole, and at the same time, its head is provided with a threaded counterbore, and is threadedly connected with the tail end of the clamp 4 through the threaded counterbore. Rotation can adjust the relative position of the two in the axial direction. When the relative position is determined, the lock nut 3 is connected with the external thread at the rear end of the reaming tool 2 for positioning the reaming tool 2 . The tail of the clamp 4 is a conical body, and several axial grooves are opened on the cone, so that the tail end of the clamp 4 has a certain flexibility to be tightened toward the axis. The nut 5 is connected with the external thread at the end of the clamp 4 through the internal thread at the front end, and is connected with the tapered body at the end of the clamp through the tapered hole at the rear end, so as to tighten the fit gap between the clamp 4 and the twist drill 1 and prevent the When the assembly is vertically drilled, the clamp 4 is separated from the twist drill bit 1 under the action of gravity.

As shown in FIG. 3 , the head of the reaming tool 2 is provided with a rotating blade for reaming, and the tail is provided with an external thread for connecting with the fixture 4 .

When working, set the reaming tool 2 and the fixture 4 with their relative positions adjusted on the outside of the twist drill 1, and lock and position by tightening the lock nut 3. The machine tool drives the twist drill 1, and at the same time the twist drill 1 drives the reaming tool 2 fixedly connected with it to rotate to cut large and small holes. During this working process, the fixed nut 5 is supported on the rotating body of the machine tool, and will not move upwards, which plays a role of preventing retreat.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the utility model, rather than as a limitation to the utility model, as long as within the spirit of the utility model, the above-mentioned The changes and modifications of the embodiments will all fall within the scope of the claims of the present utility model.

Claims (2)

1. A tool holder assembly with adjustable step drilling depth, characterized in that it comprises: a drill; A hollow reaming tool, set in the middle of the drill bit, and fixedly arranged with the drill bit, the head of the reaming tool is provided with a blade, and the tail is provided with an external thread; A clamp is provided with a through hole, and the clamp is sleeved on the tail of the drill bit through the through hole. The head of the clamp is also provided with a threaded counterbore, and the clamp is connected with the reaming tool through the threaded counterbore. tail screw connection; A locking nut is pressed against the head end face of the clamp and is threadedly connected with the tail of the reaming tool. 2. The tool holder assembly with adjustable step drilling depth as claimed in claim 1, wherein the tail portion of the clamp is a cone, and the cone is provided with a number of axial grooves, along which the clamp An external thread is provided next to the tapered body in the axial direction, and a fixing nut is connected with the external thread at the end of the fixture through the internal thread at the front end, and is connected with the tapered body at the end of the fixture through the tapered hole at the rear end.

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