Stepped auger bit

Abstract

A first step drill is installed on a handle portion, a second step drill is arranged in the first step drill, an insertion block is arranged at the end, facing the first step drill, of the second step drill, the insertion block is fixed in the handle portion through a limiting assembly, and splicing of the first step drill and the second step drill is achieved. Due to the fact that the inserting groove is communicated with the groove, and the inserting block extends into the groove, when the limiting column moves to the strip-shaped groove, the limiting column loses pressure, the spring deforms, the counter-acting force acts on the limiting column, the limiting column is inserted into the strip-shaped groove, and therefore the inserting block is fixed into the groove, splicing of the first step drill and the second step drill is completed, and when the second step drill is damaged, the first step drill and the second step drill are not damaged. And by pressing the limiting column, the inserting block is pulled out of the groove, the second step drill can be detached and replaced, the whole drill does not need to be replaced, and cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a stepped twist drill bit. BACKGROUND

[0002] The twist drill is a tool for drilling a round hole in a workpiece by rotating cutting along a relatively fixed axis. It is named after its spiral-shaped chip flute, and it can be clamped on a hand-held drilling tool, a drill press, a milling machine, a lathe, and even a machining center for use.

[0003] At present, when a stepped hole is processed, a stepped twist drill with different diameters of cutting parts is generally used. However, the existing stepped drill point twist drill is usually provided as a whole, and when the drill point is damaged, the whole needs to be replaced, which increases the damage cost. UTILITY MODEL CONTENT

[0004] The utility model aims to provide a stepped twist drill bit to solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a stepped twist drill bit, comprising a shank, a first stepped drill is installed on the shank, a second stepped drill is arranged in the first stepped drill, an insertion block is arranged at one end of the second stepped drill towards the first stepped drill, the insertion block is fixed in the shank through a limiting assembly, and the splicing of the first stepped drill and the second stepped drill is realized.

[0006] Preferably, the shank cross section is hexagonal, and strip grooves are formed in the six sides of the shank.

[0007] Preferably, a slot is formed in the first stepped drill, a groove is formed in the inner side of the shank and communicates with the slot, and the groove is matched with the insertion block.

[0008] Preferably, the limiting assembly comprises a hole groove formed on the surface of the insertion block, a movable sliding block is arranged in the hole groove, and a spring is arranged on one side of the sliding block towards the opening end of the hole groove.

[0009] Preferably, a limiting column is arranged at the end of the spring away from the sliding block.

[0010] Preferably, the limiting assembly is provided as two, and the two limiting assemblies are symmetrically arranged.

[0011] Preferably, the limiting column is ejected through the spring and inserted into the strip groove.

[0012] The utility model discloses a technical effect and advantage: the ladder type twist drill, press the limit post, and the limit post extrude spring, make the sliding block be pressed, and the sliding block can move the pole along the length direction of the hole groove, at this time can insert the block into the slot, because the slot is linked together with the recess, and the block extends to the recess, when the limit post moves to the strip -shaped groove, the limit post loses the pressure, and spring deformation, reaction force is in the limit post, and the limit post is inserted in the strip -shaped groove, thereby the block is fixed in the recess, and the first ladder drill and the second ladder drill are spliced, when the second ladder drill appears damage, through press the limit post, and the block is pulled out from the recess, can dismantle and replace the second ladder drill, need not to replace the whole, save the cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the whole structure schematic view of the utility model;

[0014] Figure 2 It is the structure schematic view of the spring of the utility model;

[0015] Figure 3 It is the structure schematic view of the slot of the utility model;

[0016] Figure 4 It is the section view of the sliding block of the utility model.

[0017] In the drawing: 1, handle part;2, first ladder drill;3, second ladder drill;4, insert block;5, strip -shaped groove;6, slot;7, sliding block;8, spring;9, limit post. DETAILED DESCRIPTION

[0018] Below, combining the drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described.

[0019] In order to facilitate the replacement of the second ladder drill 3, refer to Figure 1 、 Figure 2 And Figure 3As shown, the handle 1 is mounted with a first stepped drill 2, the first stepped drill 2 is provided with a second stepped drill 3, the second stepped drill 3 is provided with an insertion block 4 at one end of the first stepped drill 2, the insertion block 4 is fixed in the handle 1 through a limiting assembly, the splicing of the first stepped drill 2 and the second stepped drill 3 is realized, the limiting column 9 is pressed, the limiting column 9 extrudes the spring 8, the sliding block 7 is pressed, the sliding block 7 can move along the length direction of the hole groove, at this time the insertion block 4 can be inserted into the insertion slot 6, because the insertion slot 6 is communicated with the groove, the insertion block 4 extends into the groove, when the limiting column 9 moves to the strip-shaped groove 5, the limiting column 9 loses the pressure, the spring 8 is deformed, the reaction force is on the limiting column 9, the limiting column 9 is inserted into the strip-shaped groove 5, so that the insertion block 4 is fixed in the groove, the splicing of the first stepped drill 2 and the second stepped drill 3 is completed, when the second stepped drill 3 is damaged, the insertion block 4 is pulled out of the groove by pressing the limiting column 9, the second stepped drill 3 can be disassembled and replaced without replacing the whole.

[0020] In order to improve the stability of the first stepped drill 2 and the second stepped drill 3 when rotating, referring to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the cross section of the handle 1 is hexagonal, and the six sides of the handle 1 are provided with strip-shaped grooves 5, the strip-shaped grooves 5 are six, so that no matter at what angle the insertion block 4 is inserted into the groove, the limiting column 9 can be inserted into the strip-shaped groove 5 to fix the insertion block 4, so that the first stepped drill 2 and the second stepped drill 3 are spliced. The first stepped drill 2 is provided with an insertion slot 6, the inside of the handle 1 is provided with a groove communicated with the insertion slot 6, the groove is matched with the insertion block 4, the insertion block 4 is first inserted into the insertion slot 6, as the insertion block 4 continuously penetrates, the insertion block 4 extends into the groove, and the limiting assembly limits the insertion block 4 to be fixed in the handle 1. The limiting assembly includes a hole groove provided on the surface of the insertion block 4, the hole groove is provided with a movable sliding block 7, the sliding block 7 is provided with a spring 8 at one side of the hole groove opening, the limiting column 9 is extruded by the spring 8, the spring 8 is stressed on the sliding block 7, the sliding block 7 slides along the length direction of the hole groove, and the limiting column 9 can be completely immersed in the hole groove. As the insertion block 4 moves in the groove, the inner wall of the groove extrudes the limiting column 9. The spring 8 is provided with a limiting column 9 at the end away from the sliding block 7, when the limiting column 9 moves to the strip-shaped groove 5, the limiting column 9 loses the extrusion and can be inserted into the strip-shaped groove 5 to fix the insertion block 4. The limiting assembly is provided with two limiting assemblies, and the two limiting assemblies are symmetrically arranged, the two limiting columns 9 are inserted into the strip-shaped groove 5 at the same time, the stability of the insertion block 4 in the groove is improved, and the first stepped drill 2 and the second stepped drill 3 are more stable when rotating. The limiting column 9 is popped out by the spring 8 and is inserted into the strip-shaped groove 5.

[0021] In use, first, press the limiting column 9, the limiting column 9 extrude the spring 8, make the sliding block 7 be pressed, the sliding block 7 can move along the length direction of hole groove, at this time, the plug block 4 can be inserted into the insertion slot 6, because the insertion slot 6 is communicated with the recess, the plug block 4 extends into the recess, when the limiting column 9 moves to the strip-shaped slot 5, the limiting column 9 loses the pressure, the spring 8 deforms, the reaction force is on the limiting column 9, makes the limiting column 9 insert in the strip-shaped slot 5, thereby the plug block 4 is fixed in the recess, completes the splicing of the first stepped drill 2 and the second stepped drill 3, when the second stepped drill 3 is damaged, by pressing the limiting column 9, the plug block 4 is pulled out from the recess, the second stepped drill 3 can be disassembled and replaced.

[0022] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application.

Claims

1. A stepped twist drill bit, characterized by, The utility model relates to a first stepped drill (2) is installed on the handle (1), the second stepped drill (3) is arranged in the first stepped drill (2), the insert block (4) is arranged to the first stepped drill (2) one end of second stepped drill (3), the insert block (4) is fixed in the handle (1) through the limiting component, realizes the splicing of first stepped drill (2) and second stepped drill (3).

2. The stepped twist drill bit of claim 1, wherein: The handle (1) is hexagonal, and the six sides of the handle (1) are provided with a strip slot (5).

3. The stepped twist drill bit of claim 2, wherein: The first stepped drill (2) is provided with an insertion slot (6), and the inner side of the handle (1) is provided with a groove in communication with the insertion slot (6), and the groove is matched with the insert block (4).

4. The stepped twist drill bit of claim 1, wherein: The limiting component includes a hole groove on the surface of the insert block (4), a movable sliding block (7) is arranged in the hole groove, and a spring (8) is arranged on one side of the sliding block (7) facing the opening end of the hole groove.

5. The stepped twist drill bit of claim 4, wherein: The spring (8) is provided with a limiting column (9) away from one end of the sliding block (7).

6. The stepped twist drill bit of claim 5, wherein: The limiting component is provided with two limiting components, and the two limiting components are symmetrically arranged.

7. The stepped twist drill bit of claim 6, wherein: The limiting column (9) is popped out through the spring (8) and is inserted into the strip slot (5).

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