CN206253699U - A kind of left-handed step drill bit - Google Patents

Abstract

The utility model discloses a levogyration step drill bit, including drillstock pole and two at least main processing poles, two main processing poles are preceding main processing pole and back main processing pole respectively, an organic whole is connected with the transition processing pole between preceding main processing pole and the back main processing pole, this drillstock pole is connected with the tail end integrated into one piece of back main processing pole, the front end of preceding main processing pole has the drill point, the week side shape of preceding main processing pole is formed with preceding helical cutting edge, week side shape of back main processing pole is formed with back helical cutting edge, the external diameter of this transition processing pole is crescent by the tail end of preceding main processing pole to the front end of back main processing pole, week side shape of transition processing pole is formed with the arc cutting edge and rotates. Through being provided with two at least main processing poles, the external diameter of two main processing poles is different to connect by the transition processing pole between two main processing poles, utilize the transition processing pole to process out the chamfer to the hole, cooperate a plurality of main processing poles workable step hole, facilitate for the processing operation.

Description

A kind of left-handed step drill bit

technical field

The utility model relates to the technology in the field of drill bits, in particular to a left-handed stepped drill bit.

Background technique

In the processing of parts, there will be a lot of drilling and tapping actions, and the drill bit is a tool for drilling holes on the workpiece. The drill bits in the prior art are generally right-handed, and the right-handed rotary drilling is performed on the workpiece. Hole processing, in order to improve production efficiency, many small workpieces are processed by automatic lathes. After the workpiece is drilled with a drill, it is directly replaced with a tap for tapping, and the production efficiency is improved. However, due to the processing conditions of the drill and tap The difference is that the production efficiency is not particularly good, and because the drill bit is easy to wear, the requirements for tapping the taps are particularly high, so there are many quality problems.

As a result, there is a left-handed drill at present. The left-handed drill does not need to change the direction of rotation when drilling and tapping, and can enhance the rigidity of the drill, maintain the cutting ability of the drill and increase it, and ensure smooth chip removal during processing. . However, the current left-handed drill bit cannot process chamfered and stepped holes, and its application range is narrow. Therefore, it is necessary to improve the current left-handed drill bit.

Contents of the invention

In view of this, the utility model aims at the shortcomings of the prior art, and its main purpose is to provide a left-handed step drill, which effectively solves the problem that the existing left-hand drill cannot process chamfering and stepped holes.

In order to achieve the above object, the utility model adopts the following technical solutions:

A left-handed stepped drill bit, including a drill shank rod and at least two main processing rods, the two main processing rods are respectively a front main processing rod and a rear main processing rod, and a transition processing is integrally connected between the front main processing rod and the rear main processing rod The drill shank is integrally formed and connected with the tail end of the rear main processing rod. The front main processing rod, the transitional processing rod, the rear main processing rod and the drill shank are coaxially arranged, and the front end of the front main processing rod has a drill tip. A front helical blade is formed on the peripheral side of the front main processing rod, and the front helical blade rotates to the left; the outer diameter of the rear main processing rod is larger than that of the front main processing rod; The rear helical blade rotates to the left, and the outer diameter of the transition processing rod gradually increases from the tail end of the front main processing rod to the front end of the rear main processing rod. Rotate left.

Preferably, the outer diameter of the drill shank is larger than the outer diameter of the post-processing rod.

Preferably, the length of the front main processing rod is smaller than the length of the rear main processing rod.

Preferably, the front main processing rod has a front helical groove, the rear main processing rod has a rear helical groove, and the rear helical groove communicates with the front helical groove.

Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be known from the above technical solutions:

By setting at least two main processing rods, the outer diameters of the two main processing rods are different, and the transition processing rods are connected between the two main processing rods, and the hole can be chamfered by using the transition processing rods. The stepped hole is processed to bring convenience to the processing operation.

In order to illustrate the structural features and functions of the utility model more clearly, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the front view of the preferred embodiment of the utility model.

Explanation of the accompanying drawings:

10. Drill handle rod 20. Front main processing rod

21. Drill point 22. Front helical blade

23. Front spiral groove 30. Rear main processing rod

31. Rear helical blade 32. Rear helical groove

40. Transition processing rod 41. Arc blade

detailed description

Please refer to shown in Fig. 1, it has shown the specific structure of the preferred embodiment of the present utility model, comprises drill shank rod 10 and at least two main processing rods, and two main processing rods are respectively front main processing rod 20 and rear main processing rod The processing rod 30 , the transitional processing rod 40 is integrally connected between the front main processing rod 20 and the rear main processing rod 30 .

The drill shank 10 is integrally connected with the tail end of the rear main processing rod 30, the front main processing rod 20, the transitional processing rod 40, the rear main processing rod 30 and the drill shank 10 are coaxially arranged, and the front main processing rod 20 The front end has a drill point 21, and the peripheral side of the front main processing rod 20 is formed with a front helical blade 22. The front helical blade 22 rotates to the left. The outer diameter of the rear main processing rod 30 is greater than the outer diameter of the front main processing rod 20. A rear helical blade 31 is formed on the peripheral side of the processing rod 30, and the rear helical blade 31 rotates to the left. The outer diameter of the transitional processing rod 40 gradually increases from the tail end of the front main processing rod 20 to the front end of the rear main processing rod 30, The peripheral side surface of the intermediate machining rod 40 is formed with an arc-shaped cutting edge 41 which rotates to the left.

In this embodiment, the outer diameter of the drill shank 10 is larger than the outer diameter of the rear main processing rod 30 , and the length of the front main processing rod 20 is shorter than the length of the rear main processing rod 30 .

The front main machining bar 20 has a front helical groove 23 , and the rear main machining bar 30 has a rear helical groove 32 which communicates with the front helical groove 23 .

The key points of the design of the utility model are: by setting at least two main processing rods, the outer diameters of the two main processing rods are different, and the two main processing rods are connected by a transitional processing rod, and the hole can be chamfered by using the transitional processing rod , Cooperating with multiple main processing rods can process stepped holes, which brings convenience to processing operations.

The technical principles of the present utility model have been described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the utility model, and cannot be construed as limiting the protection scope of the utility model in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation modes of the present utility model without creative work, and these modes will all fall within the protection scope of the present utility model.

Claims (4)

1. A left-handed step drill bit, characterized in that: it includes a drill shank rod and at least two main processing rods, the two main processing rods are respectively a front main processing rod and a rear main processing rod, and the difference between the front main processing rod and the rear main processing rod There is a transition processing rod integrally connected between them, and the drill shank is integrally connected with the tail end of the rear main processing rod. The front main processing rod, transition processing rod, rear main processing rod and drill shank are coaxially arranged, and the front main processing rod The front end of the front end has a drill tip, and the peripheral side of the front main processing rod is formed with a front helical blade, and the front helical blade rotates to the left. A rear spiral blade is formed, and the rear spiral blade rotates to the left. The outer diameter of the transition processing rod gradually increases from the tail end of the front main processing rod to the front end of the rear main processing rod, and an arc-shaped blade is formed on the peripheral side of the transition processing rod , the curved blade rotates to the left. 2. A left-handed step drill according to claim 1, characterized in that: the outer diameter of the drill shank is larger than the outer diameter of the rear main machining rod. 3. A left-handed stepped drill bit according to claim 1, characterized in that: the length of the front main processing rod is shorter than the length of the rear main processing rod. 4. A left-handed step drill bit as claimed in claim 1, characterized in that: said front main processing rod has a front helical groove, the rear main processing rod has a rear helical groove, and the rear helical groove is connected to the front helical groove. Groove connected.