CN212704573U

CN212704573U - Hard alloy stepped drill

Info

Publication number: CN212704573U
Application number: CN202021395819.XU
Authority: CN
Inventors: 张万洪; 成坚; 郭康
Original assignee: Beijing Maikesi Cutting Tool Co ltd
Current assignee: Beijing Maikesi Cutting Tool Co ltd
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2021-03-16
Anticipated expiration: 2030-07-15

Abstract

The utility model belongs to the technical field of machining and specifically relates to a carbide ladder bores, and it includes the drillstock and coaxial the setting in the drill bit of drillstock one end, and the drill bit includes the ladder section of a plurality of not isodiametric and coaxial settings, and the diameter of a plurality of ladder sections reduces to the direction of keeping away from the drillstock in proper order, and the ladder blade department of two adjacent ladder sections sets to the plane, still is provided with on the drillstock to be spiral helicine cutting edge and chip groove. This application has the effect that improves ladder blade department intensity.

Description

Hard alloy stepped drill

Technical Field

The application relates to the field of machining, in particular to a hard alloy stepped drill.

Background

At present, a step drill, also called a step drill or a pagoda drill, is mainly used for drilling and processing thin steel plates within 3mm, one drill can replace a plurality of drills to process holes with different diameters according to needs, large holes can be processed and processed at one time, and the drill does not need to be replaced, positioning holes do not need to be drilled, and the like.

Referring to fig. 1, the step drill in the related art includes a drill shank 1 and a drill bit 2 coaxially disposed at one end of the drill shank 1, the drill shank 1 and the drill bit 2 are integrally formed, the drill bit 2 includes a first step section 20 and a second step section 21, the first step section 20 is located at one side of the second step section 21 far away from the drill shank 1, the diameter of the second step section 21 is greater than that of the first step section 20, two spiral cutting edges 3 are disposed on the drill bit 2, and a chip discharge groove 4 is disposed between the two cutting edges 3.

In view of the above-mentioned related art, the inventor believes that there is a defect that the junction between the first step section 20 and the second step section 21 is sharp and edge breakage often occurs.

SUMMERY OF THE UTILITY MODEL

In order to improve the intensity at ladder cutting edge department, this application provides a carbide ladder bores.

The application provides a carbide ladder bores adopts following technical scheme:

the utility model provides a carbide ladder bores, includes the drillstock and sets up in the drill bit of drillstock one end coaxially, and the drill bit includes the ladder section of a plurality of inequalities footpath and coaxial setting, and the diameter of a plurality of ladder sections reduces to the direction of keeping away from the drillstock in proper order, and the ladder blade department of two adjacent ladder sections sets to the plane, still is provided with on the drillstock to be spiral helicine cutting edge and chip groove.

Through adopting above-mentioned technical scheme, the ladder blade department of two adjacent ladder sections sets to the plane to effectively reduced ladder blade department and taken place the condition of tipping.

Preferably, the surface of the chip groove is provided as a polished surface.

By adopting the technical scheme, the polishing surface on the chip groove is beneficial to discharging the waste chips along the chip groove.

Preferably, the drill handle is sleeved with an extension cylinder, a limiting hole is formed in the side wall of the extension cylinder, a plurality of limiting grooves are formed in the side wall of the drill handle along the length direction of the drill handle, and a limiting part used for being embedded into the limiting grooves to fix the drill handle is further installed in the limiting hole.

Through adopting above-mentioned technical scheme, operating personnel can be according to actual conditions with the drill shank from the one end distance of pulling out in the extension section of thick bamboo, then use the locating part with the rigidity of drill shank, can install the ladder brill on electric hand drill at last to be suitable for multiple operating mode, saved the cost of customizing the ladder brill alone.

Preferably, the inner wall of the extension cylinder is provided with a convex rib, and the side wall of the drill handle is provided with a sliding groove matched with the convex rib in a sliding manner along the length direction of the drill handle.

Through adopting above-mentioned technical scheme, the bead cooperation groove of sliding has restricted the removal orbit of drillstock, makes the difficult relative extension section of thick bamboo of drillstock rotate simultaneously, and conveniently makes spacing hole and spacing groove counterpoint.

Preferably, an internal thread is arranged in the limiting groove, and the limiting part is a screw.

Through adopting above-mentioned technical scheme, screw convenient to use can make the comparatively quick fixed drill shank of operating personnel.

Preferably, one side of the limiting hole close to the outer wall of the extension cylinder is provided with a countersunk groove, and the screw is a countersunk screw.

By adopting the technical scheme, the countersunk head screw does not protrude out of the outer wall surface of the extension cylinder, so that the extension cylinder is more convenient to mount into an electric hand drill.

Preferably, the end of the countersunk head screw is provided with a yielding groove for inserting the screwdriver, a baffle plate used for sealing the yielding groove is arranged in the yielding groove, and an elastic part used for elastically supporting the baffle plate is arranged between the baffle plate and the bottom wall of the yielding groove.

Through adopting above-mentioned technical scheme, the baffle has the effect in sealed groove of stepping down for debris such as dust are difficult for getting into the inslot of stepping down, avoid stepping down the inslot and overstock too much debris and influence the insertion of screwdriver.

Preferably, the elastic member is a spring.

Through adopting above-mentioned technical scheme, the spring stable performance, convenient for material selection.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the drill handle, the drill bit, the cutting edges, the drainage grooves and the planes at the step cutting edges are arranged, and the step cutting edges of two adjacent step sections are arranged to be the planes, so that the condition that the step cutting edges are broken is effectively reduced;

2. by arranging the extension cylinder, the limiting hole, the limiting groove and the limiting piece, an operator can pull the drill handle out of the extension cylinder by a distance according to actual conditions, then fix the position of the drill handle by using the limiting piece, and finally install the step drill on the electric hand drill, so that the electric hand drill is suitable for various working conditions, and the cost for individually customizing the step drill is saved;

3. through setting up countersunk screw, groove, baffle and the elastic component of stepping down, countersunk screw does not bulge the outer wall surface of an extension section of thick bamboo for it is more convenient when the electric drill is installed to an extension section of thick bamboo, and the baffle has the effect in sealed groove of stepping down, makes debris such as dust be difficult for getting into the inslot of stepping down, avoids stepping down the inslot and overstocks the inserting that influences the screwdriver.

Drawings

Fig. 1 is a schematic structural diagram of a step drill provided in the related art;

FIG. 2 is a schematic structural diagram of a cemented carbide stepped drill according to one embodiment of the present disclosure;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

FIG. 4 is a schematic structural diagram of a cemented carbide stepped drill according to a second embodiment of the present application;

FIG. 5 is an exploded view of the drill shank, the extension barrel and the countersunk head screw according to the second embodiment;

fig. 6 is a cross-sectional view showing the relationship of the retainer, spring and countersunk screw.

Description of reference numerals: 1. a drill shank; 10. a sliding groove; 11. a limiting groove; 2. a drill bit; 20. a first step section; 21. a second step section; 22. a plane; 3. a cutting edge; 4. a chip groove; 5. an extension cylinder; 50. a rib; 51. a limiting hole; 52. a countersunk groove; 6. countersunk head screws; 60. a yielding groove; 61. a baffle plate; 62. a spring.

Detailed Description

The present application is described in further detail below with reference to figures 2-6.

The embodiment of the application discloses a hard alloy step drill.

Example 1

Referring to fig. 2 and 3, a cemented carbide stepped drill includes a drill shank 1 and a drill bit 2 coaxially disposed at one end of the drill shank 1; the drill handle 1 is cylindrical, and the drill handle 1 and the drill bit 2 are integrally processed and molded; the drill bit 2 is in a step shape and comprises a first step section 20 and a second step section 21, the diameter of the first step section 20 is 12.8mm, the first step section 20 is located on one side, far away from the drill shank 1, of the second step section 21, the diameter of the first step section 20 is smaller than that of the second step section 21, the diameter of the second step section 21 is equal to that of the drill shank 1, the diameter of the second step section 21 is 16mm, a plane 22 is arranged at a step cutting edge where the first step section 20 and the second step section 21 are connected, the strength of the step cutting edge is enhanced, and the included angle of the two planes 2 is 90 degrees; the end of the first step section 20 far away from the second step section 21 is provided with a conical surface with an opening angle of 138 degrees, and the end of the second step section 21 close to the first step section 20 is provided with a conical surface with an opening angle of 90 degrees.

The circumferential surface of the drill 2 is provided with two cutting edges 3 along the axial direction of the drill 2, the cutting edges 3 are provided in a spiral shape, the spiral angle of the cutting edges 3 is 30 degrees, and in other examples, the spiral angle may be 40 degrees; chip grooves 4 are correspondingly arranged between two adjacent cutting edges 3, and the surfaces of the chip grooves 4 are polished to form polished surfaces so as to facilitate rust discharge.

The implementation principle of the embodiment 1 is as follows: after the operation personnel installed the ladder drill on electric hand drill, aim at the work piece that needs drilling, then opened electric hand drill, the ladder drill begins to drill on the work piece, in drilling ladder department, because first step section 20 and second step section 21 linking department set to the plane, the effectual intensity that has strengthened ladder blade department, and then effectively solved ladder blade department and taken place the condition of tipping easily.

Example 2

Referring to fig. 4 and 5, the difference between this embodiment and embodiment 1 is that an extension cylinder 5 for increasing the overall length of the step drill is arranged on the drill shank 1, and the step drill can be adapted to more working conditions, for example, to drilling requirements at different depths, by the extension cylinder 5, thereby reducing the cost for setting the corresponding step drill according to different working conditions; the extension cylinder 5 is a cylinder structure with an opening at one end, the inner diameter of the extension cylinder 5 is matched with the outer diameter of the drill handle 1, a plurality of convex ribs 50 are fixedly connected on the inner circumferential surface of the extension cylinder 5 along the length direction of the extension cylinder 5, the convex ribs 50 are uniformly distributed along the circumferential direction of the extension cylinder 5, a plurality of sliding grooves 10 are correspondingly arranged on the outer circumferential surface of the drill handle 1 along the length direction of the drill handle 1, the sliding grooves 10 are uniformly distributed along the circumferential direction of the drill handle 1 and are matched with the convex ribs 50, a limit hole 51 is arranged on the side wall of the extension cylinder 5 close to the end part of the opening, a countersunk groove 52 is arranged on one side of the limit hole 51 close to the outer wall of the extension cylinder 5, the countersunk groove 52 is communicated with the limit hole 51, a plurality of limit grooves 11 are uniformly arranged on the side wall of the drill handle 1 along the length direction of the drill handle 1, internal threads are arranged in the limit grooves 11, and countersunk screws 6 which are in threaded, the drill handle 1 is fixed through a countersunk head screw 6; the top end of the countersunk head screw 6 is provided with a relief groove 60 for the screwdriver to insert, the relief groove 60 in the embodiment is a straight groove, and in other examples, the relief groove may be a cross groove.

Referring to fig. 5 and 6, in order to reduce the situation that the abdicating groove 60 is blocked by impurities such as dust, a baffle 61 adapted to the abdicating groove 60 is installed in the abdicating groove 60, an elastic member is arranged between the baffle 61 and the bottom wall of the abdicating groove 60, the elastic member in the embodiment is a spring 62, in other examples, an elastic metal sheet is also used, the number of the spring 62 is two, two ends of the spring 62 are fixedly connected with the baffle 61 and the countersunk head screw 6 respectively, the baffle 61 is elastically supported by the spring 62, and in an unused state, the side surface of the baffle 61 departing from the abdicating groove 60 is flush with the end surface of the countersunk head screw 6, so that a sealing effect is achieved.

The implementation principle of the embodiment 2 is as follows: the operator pulls the drill shank 1 out of the extension cylinder 5 by a certain distance according to actual conditions, then fixes the position of the drill shank 1 by using the countersunk head screw 6, and then installs the step drill on the electric hand drill.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A hard alloy step drill is characterized in that: including drillstock (1) and coaxial setting in drill bit (2) of drillstock (1) one end, drill bit (2) include a plurality of inequality footpaths and the coaxial ladder section that sets up, and the diameter of a plurality of ladder sections reduces to the direction of keeping away from drillstock (1) in proper order, and the ladder blade department of two adjacent ladder sections sets to plane (22), still is provided with on drill bit (2) to be spiral helicine cutting edge (3) and chip groove (4).

2. The cemented carbide step drill of claim 1, wherein: the surface of the chip groove (4) is set to be a polished surface.

3. The cemented carbide step drill of claim 1, wherein: the drill handle (1) is sleeved with an extension cylinder (5), a limiting hole (51) is formed in the side wall of the extension cylinder (5), a plurality of limiting grooves (11) are formed in the side wall of the drill handle (1) along the length direction of the drill handle (1), and limiting parts used for being embedded into the limiting grooves (11) to fix the drill handle (1) are further installed in the limiting holes (51).

4. A cemented carbide step drill according to claim 3, characterised in that: the inner wall of the extension cylinder (5) is provided with a convex rib (50), and the side wall of the drill handle (1) is provided with a sliding groove (10) matched with the convex rib (50) in a sliding manner along the length direction of the drill handle (1).

5. A cemented carbide step drill according to claim 3, characterised in that: an internal thread is arranged in the limiting groove (11), and the limiting part is a screw.

6. The cemented carbide step drill of claim 5, wherein: one side of the limiting hole (51) close to the outer wall of the extension cylinder (5) is provided with a countersunk groove (52), and the screw is a countersunk screw (6).

7. The cemented carbide step drill of claim 6, wherein: the end part of the countersunk head screw (6) is provided with a yielding groove (60) for inserting a screwdriver, a baffle (61) used for sealing the yielding groove (60) is arranged in the yielding groove (60), and an elastic part used for elastically supporting the baffle (61) is arranged between the baffle (61) and the bottom wall of the yielding groove (60).

8. The cemented carbide step drill of claim 7, wherein: the elastic member is a spring (62).