CN210817595U - Step drill with easily-replaced drill tip - Google Patents

Abstract

The utility model relates to an easily change ladder of drill point and bore. This ladder is bored including boring the core, and bore core one end and be the drillstock, and the other end is connecting portion, has cup jointed the brill body of frustum form on the connecting portion, and the connecting portion end is connected with coniform drill point, bores the coaxial setting of body, drill core and drill point, and the relation between drill point bottom surface radius R and the drill body up end radius R is: r is less than or equal to 1.2R, the bottom surface of the drill point is provided with a screw rod which is coaxial with the drill point, a threaded hole which is coaxial with the drill core is arranged on the end surface of the connecting part, the screw rod on the drill point and the internal thread on the drill core are matched with each other, so that the drill core and the drill body do not need to be taken out when the drill point is disassembled, and due to the arrangement of each dovetail groove on the drill body, when the tapered tooth strip is replaced, the worn tapered tooth strip can be directionally replaced, and the rest intact tapered tooth strips continue to be used, so that the cost is saved, the service life of the whole stepped drill is prolonged to the maximum extent, and the stepped drill is suitable for industrial production and has strong practicability.

Description

Step drill with easily-replaced drill tip

Technical Field

The utility model belongs to the technical field of the ladder is bored, especially, relate to an easily change ladder of drill point and bore.

Background

The patent with the name of detachable and replaceable stepped drill bit is disclosed in the existing Chinese patent database, the application number is CN201720913745.6, the application date is 2017.07.26, the publication number is CN207043394U and the publication date is 2018.02.27, the patent comprises a circular drill bit body, one end of the circular drill bit body is provided with a clamping part, the other end of the circular drill bit body is provided with a spiral, the circular drill bit is characterized in that the diameter of one end of the clamping part is smaller than that of one end of the spiral, a chip blocking platform is arranged between one end of the clamping part and one end of the spiral, the chip blocking platform is in a conical arrangement, the chip blocking platform is provided with a conical upper end and a planar lower end, the conical upper end is close to one end of the spiral, the planar lower end is close to one end of the clamping part, the spiral comprises a fixed end spiral and a detachable spiral, a fixed hole is arranged inside the fixed end spiral, be provided with the internal thread in the fixed orifices, can dismantle the external screw thread that the spiral set up including first spiral, second spiral and cooperation, the diameter of first spiral is greater than the diameter of second spiral, and its weak point lies in: the fixing mode of the screw tap is only through thread fixing, and once the tangential force is too large, the screw tap is very easy to break off, and meanwhile, the conical tooth part of the stepped drill bit is integrated, so that the whole drill bit needs to be replaced due to slight abrasion, and the energy loss is increased.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is that current ladder bores complex operation when changing the drill bit, and can not directional change wherein the part of damage, is unfavorable for the long-term use that the ladder bored, in order to improve its weak point, the utility model provides an easily change the ladder of drill point and bores.

In order to achieve the purpose, the utility model is realized by the following technical proposal:

the utility model provides an easily change ladder of point of drill bores, is the drillstock including boring the core, and drill core one end is the drillstock, and the other end is connecting portion, has cup jointed the drill body of frustum form on the connecting portion, and the connecting portion end is connected with coniform point of drill, drill body, drill core and the coaxial setting of point of drill, the relation between point of drill bottom surface radius R and the drill body up end radius R is: r is more than or equal to 1.2R, a screw rod coaxial with the drill tip is arranged on the bottom surface of the drill tip, a threaded hole coaxial with the drill core is formed in the end surface of the connecting part, the screw rod is matched with the threaded hole, the bottom surface of the drill tip is abutted against the upper end surface of the drill body, and the rotating direction of the drill tip is consistent with that of the screw rod.

The utility model discloses the during operation, when the drill point needs to be changed, keep drill core and drill body motionless, only need to unscrew the screw rod of drill point bottom surface from the screw hole of drill core connecting portion, the relation between drill body up end radius R and the drill point bottom surface radius R has guaranteed that the ladder bores at the during operation, has level and smooth transition between by boring the aperture to the macropore, when the drill body needs to be changed, treats that the drill point takes out the back from the lower extreme, takes out the drill body from the drill core along the axial, when the awl dental lamina on the drill body needs to be changed, takes out the awl dental lamina along the dovetail direction, and the gap between the adjacent awl dental lamina constitutes the chip groove, prevents iron fillings departure, the drill point revolves to unanimous with the screw rod soon, when the drill point is rotatory, screw rod on the drill point revolves to connect more closely with the screw hole on the drill core soon.

Compared with the prior art, the beneficial effects of the utility model are that: because the screw rod on the drill point and the internal thread on the drill core mutually support, make the drill point need not take out drill core and drill body when dismantling, simultaneously because the setting of convex shoulder and annular end plate on the drill core, make the location of drill body more stable, because the setting of each dovetail on the drill body, make when changing awl dental lamina, the awl dental lamina of change wearing and tearing that can be directional, all the other intact awl dental lamina continue to use, be favorable to saving the cost, the life of the whole ladder of extension of maximize is bored, this ladder bores and is applicable to among the industrial production, have very strong practicality.

The outer surface of the connecting part is provided with a long-strip-shaped lug along the length direction of the connecting part, a groove which is embedded with the long-strip-shaped lug is formed in a hole in the inner wall of the drill body, an annular convex shoulder is arranged on the inner wall of the drill body on one side of the upper end face of the drill body, and a gap for embedding the annular convex shoulder is reserved between the end face of the connecting part and each long-strip-shaped lug.

The drill body is including the frustum form base member of being connected with the drill core, and the spaced apart a plurality of dovetails that are equipped with on the frustum form base member outer peripheral face, and all scarf joint has long banding awl tooth strip in each dovetail, and awl tooth strip is including with the spacing strip of dovetail complex arcuation and set up the awl tooth portion on the spacing strip convex surface of arcuation, awl tooth portion protrusion frustum form base member outer peripheral face sets up, and the gap between the adjacent awl tooth strip constitutes chip guide groove, is located to be provided with on the drillstock with the coaxial annular end plate of drillstock, terminal surface corresponds the end with each awl tooth strip and contradicts on annular end plate under the frustum form base member.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a top view of the present invention.

In the figure: 1 core, 101 drill handle, 102 connecting part, 103 threaded hole, 104 elongated bump, 105

An annular end plate, a drill body 2, a groove 201, an annular shoulder 202, a frustum-shaped base 203, a conical tooth bar 204,

2041 arc limiting strip, 2042 taper tooth part, 205 chip guide groove, 3 drill point and 301 screw.

Detailed Description

The technical solution of the present application will be further described and explained with reference to the accompanying drawings and embodiments.

As shown in fig. 1-2, the step drill with the drill tip easy to replace includes a drill core 1, one end of the drill core 1 is a drill shank 101, the other end is a connection portion 102, a frustum-shaped drill body 2 is sleeved on the connection portion 102, the end of the connection portion 102 is connected with a conical drill tip 3, the drill body 2, the drill core 1 and the drill tip 3 are coaxially arranged, and the relationship between the radius R of the bottom surface of the drill tip 3 and the radius R of the upper end surface of the drill body 2 is as follows: r is more than R and less than or equal to 1.2R, the bottom surface of the drill tip 3 is provided with a screw 301 which is coaxial with the drill tip 3, the end surface of the connecting part 102 is provided with a threaded hole 103 which is coaxial with the drill core 1, the screw 301 is matched with the threaded hole 103 to enable the bottom surface of the drill tip 3 to be abutted against the upper end surface of the drill body 2, and the rotating direction of the drill tip 3 is consistent with the rotating direction of the screw 301. The outer surface of the connecting part 102 is provided with a long-strip-shaped lug 104 along the length direction of the connecting part 102, a groove 201 which is in scarf joint with the long-strip-shaped lug 104 is formed in an inner wall hole of the drill body 2, an annular convex shoulder 202 is arranged on the inner wall of the drill body 2 which is positioned on one side of the upper end face of the drill body 2, and a gap which is in scarf joint with the annular convex shoulder 202 is reserved between the end face of the connecting part 102 and each.

The drill body 2 comprises a frustum-shaped base body 203 connected with the drill core 1, a plurality of dovetail grooves are arranged on the outer peripheral surface of the frustum-shaped base body 203 at intervals, strip-shaped cone tooth strips 204 are embedded in the dovetail grooves, each cone tooth strip 204 comprises an arc-shaped limiting strip 2041 matched with the dovetail grooves and a cone tooth part 2042 arranged on the convex surface of the arc-shaped limiting strip 2041, each cone tooth part 2042 protrudes out of the outer peripheral surface of the frustum-shaped base body 203, a gap between every two adjacent cone tooth strips 204 forms a chip guide groove 205, an annular end plate 105 coaxial with the drill shank 101 is arranged on the drill shank 101, and the lower end surface of the frustum-shaped base body 203 and the corresponding end of each cone tooth strip 204 abut against the annular end plate 105.

When the drill bit 3 needs to be replaced, the drill core 1 and the drill body 2 are kept still, only the screw 301 on the bottom surface of the drill bit 3 needs to be screwed out of the threaded hole 103 of the connecting part 102 of the drill core 1, the relation between the radius R of the upper end surface of the drill body 2 and the radius R of the bottom surface of the drill bit 3 ensures that the stepped drill has smooth transition from a small hole to a large hole when in work, when the drill body 2 needs to be replaced, the drill body 2 is axially taken out of the drill core 1 after the drill bit 3 is taken out from the lower end, when the tapered tooth strips 204 on the drill body 2 need to be replaced, the tapered tooth strips 204 are taken out along the dovetail groove direction, a gap between adjacent tapered tooth strips 204 forms a chip guide groove 205, the iron chips are prevented from flying out of the drill bit 3 and are prevented from rotating to be consistent with the rotating direction of the screw 301, and when the drill bit 3 rotates, the screw 301 on the drill bit 3 is screwed with the.

The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and transformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and transformations are all within the protection scope of the present invention.

Claims (3)

1. The utility model provides an easily change ladder of point of drill bores which characterized in that: including boring the core, boring core one end is the drillstock, and the other end is connecting portion, has cup jointed the drill body of frustum form on the connecting portion, and the connecting portion end is connected with coniform drill point, drill body, drill core and the coaxial setting of drill point, the relation between drill point bottom surface radius R and the drill body up end radius R is: r is more than or equal to 1.2R, a screw rod coaxial with the drill tip is arranged on the bottom surface of the drill tip, a threaded hole coaxial with the drill core is formed in the end surface of the connecting part, the screw rod is matched with the threaded hole, the bottom surface of the drill tip is abutted against the upper end surface of the drill body, and the rotating direction of the drill tip is consistent with that of the screw rod.

2. The step drill with the replaceable drill tip as claimed in claim 1, wherein: the outer surface of the connecting part is provided with a long-strip-shaped lug along the length direction of the connecting part, a groove which is embedded with the long-strip-shaped lug is formed in a hole in the inner wall of the drill body, an annular convex shoulder is arranged on the inner wall of the drill body on one side of the upper end face of the drill body, and a gap for embedding the annular convex shoulder is reserved between the end face of the connecting part and each long-strip-shaped lug.

3. The step drill with the replaceable drill tip as claimed in claim 2, wherein: the drill body is including the frustum form base member of being connected with the drill core, and the spaced apart a plurality of dovetails that are equipped with on the frustum form base member outer peripheral face, and each dovetail is embedded to have connect long banding awl tooth strip, and awl tooth strip is including with the spacing strip of dovetail complex arcuation and set up the awl tooth portion on the spacing convex surface of arcuation, the setting of awl tooth portion protrusion frustum form base member outer peripheral face, and the gap between the adjacent awl tooth strip constitutes the chip guide groove, is located to be provided with on the drillstock with the coaxial annular end plate of drillstock, terminal surface corresponds the end with each awl tooth strip and contradicts on annular end plate under the frustum form base member.

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