CN2578028Y - Center drill - Google Patents

Abstract

A center drill comprises a drill handle, a drill body and a drill top, wherein the drill body is provided with two spiral cutting teeth which are arranged at intervals and formed at the periphery, two radially concave chip guide surfaces which are adjacent to one sides of the cutting teeth, and two extending surfaces which are connected between the other sides of the cutting teeth and the chip guide surfaces, each cutting tooth is provided with a cutting surface which is connected with the chip guide surface, a connecting surface which is connected with the extending surface, a drill back which is connected with the cutting surface and the connecting surface, and a drill edge with a sharp angle, the drill top is provided with two cutting surfaces which extend spirally along the chip guide surface and the cutting surface respectively and are obliquely cut downwards, two lip surfaces which extend spirally along the extending surface and the drill back respectively and are obliquely downwards, two cutting edges which are connected with the drill edge respectively, and a dead point which is positioned at one end and is formed by the joint of the cutting surfaces, the lip surfaces and the cutting edges. The utility model discloses a central brill contacts the power area big and more sharp-pointed, can bore and establish straight hole, inclined hole to become drill bit, lathe tool, milling cutter.

Description

Centre drill

[technical field]

The utility model relates to a kind of centre drill, particularly relates to a kind of centre drill that is used for being drilled with the center guide hole.

[background technology]

The program of general boring is: locate → select for use suitable drill bit and set execution conditions → with centre drill drill centers → hole → bore a hole → fraising, certainly when boring, drill bit segmented boring that can several different-diameters, or can omit follow-up boring a hole and the fraising process according to need.This centre drill mainly is to be used for guide hole, when using, must conflict on plane, inclined-plane or the cambered surface of a predetermined drilling, and the rotation feed, on this face, bore and make a taper hole, follow-up boring for guiding.

As shown in Figures 1 and 2, a kind of centre drill 1 in the past is a central axis 10 extension downwards in regular turn along it, comprise: a drillstock 11, bores body 12, and bores top 13, and two at intervals around these central axis 10 spirals and be formed at this brills body 12 and bore top 13 drill flute 14 on every side.This brill body 12 has contract gradually from a lower end of this round rod segment 121 conical section 122 of Shu Yanshen of a round rod segment 121, that connects this drillstock 11 downwards, and one from a lower end of this conical section 122 downwards directly to the guide rod section 123 of extending.This brill top 13 has the two corresponding at intervals cutting lips 131 that tilt to connect from a lower end of this guide rod section 123.These cutting lips 131 are homonymies that are adjacent to these drill flutes 14.Each drill flute 14 be by this brill body 12 and bore top 13 around towards the radially recessed groove of the direction of this central axis 10, when this centre drill 1 pierces a workpiece, can get rid of drilling cuttings thus and add cutting agent.These cutting lips 131 and drill flute 14 are to hold in the mouth intersection one dead point 15 mutually, and this dead point 15 is one to be positioned at the intermarginal seamed edge in an end of these cutting lips 131.

As shown in Figure 3, this centre drill 1 is on a plane 16 or inclined-plane when being drilled with a straight hole 161, this centre drill 1 vertically is placed on this plane 16, make this dead point 15 conflict in predetermined drilling place on this plane 16, and rotation feed, make a taper straight hole 161 on this plane 16, to bore, use for follow-up boring guiding.Yet the sectional area that the guide rod section 123 of this brill body 12 and conical section are 122 differs bigger, darker as if holing in the process of being drilled with, and when making this conical section 122 also pierce this plane 16, at first, acute excessively because of this guide rod section 123 when being drilled with to the Volume Changes of conical section 122, obstruction when causing conical section 122 feeds is bigger, be difficult to steadily feed successfully, the application of force is pressed conical section 122 and is advanced into slightly, secondly, when being drilled with the back withdrawing, because of this conical section 122 is that plug is against in the straight hole 161 on this plane 16, the periphery of this conical section 122 and to define between a wall of this straight hole 161 are chimeric zero-clearance states, therefore be difficult to withdrawing, and because of this centre drill 1 can only be used for being drilled with a guide hole, therefore the diameter of this guide hole can not be drilled with the diameter of the boring of finishing greater than a palpus, so when deep drilling, must carefully measure the degree of depth that conical section 122 is drilled with, be not easy, moreover be positioned at two of drill flute 14 edges on this conical section 122 and bore limits, spiral inclination angle with respect to this central axis 10 is less and not sharp keen, and the area that these brill limits take conical section 122 relatively is less, negligible amounts, therefore the out of roundness of boring is relatively poor.

As shown in Figure 4, when this centre drill 1 is drilled with an inclined hole 171 or straight hole on a cambered surface 17, this centre drill 1 is tiltedly stood on this cambered surface 17 according to the angle of institute's palpus, order wherein this cutting lip 131 is conflicted in predetermined drilling place of this cambered surface 17, and the rotation feed, make a taper inclined hole 171 on this cambered surface 17, to bore.Yet when being drilled with, the contact area of this cutting lip 131 on this cambered surface 17 is less, the grasping force deficiency when therefore causing feed, slippage and can't being drilled with easily.

In addition, general toolroom machine can need according to processing procedure usually, and must purchase cutters such as drill bit, lathe tool, milling cutter, planing tool, in order to the cutwork of various variety classeses and degree.Yet this centre drill 1 is because of being confined to shape-designing, sharpness and grasping factors such as face, therefore can only be used to be drilled with a centre bore, and can't be applicable to cutters such as becoming a drill bit, lathe tool, milling cutter, so the scope of application is less, can't multitask how to use on the way, therefore must purchase multiple different types of above-mentioned cutter in the working site, comparatively trouble.

[utility model content]

The purpose of this utility model is to provide a kind of contact to put forth effort the big and more sharp-pointed centre drill of area, can be drilled with straight hole, inclined hole, to become drill bit, lathe tool, milling cutter.

The utility model provides a kind of centre drill, comprises a drillstock, that extends in regular turn along a central axis downwards and bores a body and a brill top, it is characterized in that:

This drillstock is the body of rod along this central axis extension;

This brill body be one from a bottom of this drillstock along contract the gradually downwards taper body of rod of Shu Yanshen of this central axis, and have two and be formed at around this body of rod separately and around the rotating spiral helicine cutting teeth of this central axis spiral, the helical form dust lead face that two correspondences are adjacent to a side of this cutting teeth and radially are recessed into towards central axis, and two correspondences are connected in the opposite side of this cutting teeth and the spiral extension face between dust lead face, each cutting teeth has this dust lead face of connection and the cross section is the tangent plane of the arc of opening outwardly, one connects this extended surface and the downward company's face of constriction gradually of width, one connects the brill back of the body of this tangent plane and company's face, and one by this tangent plane and bore the sharp-pointed brill limit of angle that back of the body intersection is connected to form, between this dust lead face and tangent plane, define a guide groove jointly, between this extended surface and company's face, define groove on one side jointly; And

This brill top be one from this brills body along the sharp downwards protruding taper of this central axis, and have two and extend spirally and downward-sloping labial surface, two connects this brill limit respectively and is formed at side cut between this sword face and labial surface along the brill back of the body of this extended surface and cutting teeth respectively along the sword face, two that tangent plane extends spirally and downward-sloping arc is cut of this dust lead face and cutting teeth respectively, an and dead point that is positioned at an end, this sword face, labial surface and side cut are common the connection to meet at this dead point, and each sword face defines one radially towards the recessed grooving of the direction of this central axis.

The utility model can provide a kind of contact to put forth effort the big and more sharp-pointed centre drill of area, can be drilled with straight hole, inclined hole, and can become cutters such as a drill bit, lathe tool, milling cutter, carry out the cutwork of various variety classeses and degree, therefore the scope of application is wider, use on the way but multitask is many,, can reduce equipment cost and store the space so must must not purchase multiple different types of above-mentioned cutter in the working site.

[description of drawings]

Below by most preferred embodiment and accompanying drawing centre drill of the present utility model is elaborated, in the accompanying drawing:

Fig. 1 is a stereo appearance figure of centre drill in the past;

Fig. 2 is an elevational schematic view of centre drill in the past;

Fig. 3 be in the past centre drill one use schematic diagram, be presented at the state that is drilled with a straight hole on the plane;

Fig. 4 is that another of centre drill used schematic diagram in the past, is presented at the state that is drilled with a straight hole on the cambered surface;

Fig. 5 is a stereo appearance figure of a preferred embodiment of the utility model centre drill;

Fig. 6 is an elevational schematic view of preferred embodiment;

Fig. 7 is a cross-sectional schematic of this preferred embodiment, shows by one to bore the state that radially dissects and upwards look up that is in;

Fig. 8 is that schematic diagram is used in one of preferred embodiment, is presented at the state that is drilled with a straight hole on the plane; And

Fig. 9 is another use schematic diagram of preferred embodiment, is presented at the state that is drilled with a straight hole on the cambered surface.

[specific embodiment]

As Fig. 5 and shown in Figure 6, a preferred embodiment of the utility model centre drill is to comprise along downward in regular turn extension of its central axis 2: a drillstock 3, bores body 4, and a brill pushes up 5.

This drillstock 3 is the circular body of rod along these central axis 2 extensions.

As Fig. 5 and shown in Figure 7, this brill body 4 be one from a bottom of this drillstock 3 along contract the gradually downwards taper body of rod of Shu Yanshen of this central axis 2, and have two and be formed at spiral helicine cutting teeth 41 around this body of rod, a homonymy that two correspondences are adjacent to these cutting teeths 41 separately and radially towards the recessed helical form dust lead face 42 of central axis 2, and two correspondences are connected in the spiral extension face 43 of 42 in another homonymies of these cutting teeths 41 and dust lead face.Each cutting teeth 41 is around this central axis 2 spirals revolution, and have one radially connect this dust lead face 42 and cross section be the tangent plane 411, of the arc of opening outwardly radially connect this extended surface 43 and width downwards gradually constriction is connected this tangent plane 411 and connects the brill back of the body 413 of face 412 until the company's face 412, that links to each other with these extended surface 43 radians, and one by this tangent plane 411 and bore and carry on the back the sharp-pointed brill limit 414 of angle that 412 intersections are connected to form.Define a helical form guide groove 44 jointly at this dust lead face 42 and 411 of tangent planes, this guide groove 44 bores the degree of depth of the back of the body 413 with respect to this, and is identical from top to bottom, can be in order to get rid of drilling cuttings and to add cutting agent.Define a helical form limit groove 45 that is connected this guide groove 44 at this extended surface 43 jointly with connecting 412 in face, this limit groove 45 bores with respect to this and carries on the back 413 the degree of depth, is gradually shallow from top to bottom.

As Fig. 5 and shown in Figure 6, this brill top 5 be one from this brills body 4 along the sharp downwards protruding tapers of this central axis 2, and have two respectively along the sword face 51 that tangent plane 411 extends spirally and downward-sloping arc is cut of this dust lead face 42 and cutting teeth 41, two carry on the back 413 along the brill of this extended surface 43 and cutting teeth 41 respectively extends spirally and downward-sloping labial surface 52, two connect this brill limit 414 respectively and are formed at this sword face 51 and the side cut 53 of 52 of labial surfaces, two respectively by this sword face 51 and labial surface 52 rotating side 54 in contrast to this side cut 53 that forms that defines, and a sharp-pointed dead point 55 that is positioned at a pointed cone end.These sword faces 51, labial surface 52, side cut 53 and 54 common connections of rotating side meet at this dead point 55.Each sword face 51 defines one radially towards the recessed grooving 511 of the direction of this central axis 2, and this grooving 511 is in the recessed degree of depth of a side of contiguous this side cut 53, be deeper than the recessed degree of depth of a side that connects this rotating side 54, can make relatively cut edge 53 more thin cut sharp keen.

As shown in Figure 8, this centre drill vertically is placed on this centre drill 1 on this plane 6 on a plane 6 or inclined-plane when being drilled with a straight hole 61, make this dead point 55 conflict in predetermined drilling place on this plane 6, and the rotation feed, make a taper straight hole 61 on this plane 6, to bore, use for follow-up boring guiding.This dead point 55 is a sharp-pointed end points, therefore has the effect of guiding in boring, and is easy to fixed point boring.This brill top 5 and brill body 4 are the phase gonnecting rod bodies that are to tilt gradually, each section cross section is and gradually changes, there is no the acute excessively situation of changes of section, therefore the boring of feed successfully when boring, and after boring withdrawing successfully, and the bore diameter that is drilled with is comparatively certain, so when deep drilling, be easier to tolerance, comparatively easily convenient in the use, and should cut edge 53 and bore limit 414 with respect to the spiral inclination angle of this central axis 2 more greatly, comparatively thin sword is sharp keen, and it is bigger that these brill limits 414 take the area that bores body 4 relatively, and therefore the out of roundness of boring is preferable.

As shown in Figure 9, when centre drill of the present utility model is drilled with an inclined hole 71 or straight hole on a cambered surface 7, this centre drill is tiltedly stood on this cambered surface 7 according to the angle of institute palpus, and make a wherein side cut 53 conflict in predetermined drilling place of this cambered surface 7, and the rotation feed is made a taper inclined hole 71 to bore on this cambered surface 7.And when being drilled with, because of these 53 long, thin swords of cutting edge are sharp keen, and the contact area of labial surface 52 on this cambered surface 7 is bigger, so can have big enough grasping forces during feed, and can cut in this cambered surface 7, can boring on cambered surface 7 easily.

In addition, the utility model more bores these sword faces 51, labial surface 52, the side cut 53 on top 5 because of this, and the shape-designing of dead point 55, can have more sharp-pointed dead point 55, sharper keen and long side cut 53, and the bigger labial surface 52 of area, and make the utility model can become cutters such as a drill bit, lathe tool, milling cutter, carry out the cutwork of various variety classeses and degree, therefore the scope of application is wider, use on the way but multitask is many,, can reduce equipment cost and store the space so must must not purchase multiple different types of above-mentioned cutter in the working site.

Take a broad view of above-mentionedly, the utility model can provide a kind of contact to put forth effort the big and more sharp-pointed centre drill of area really, can be drilled with straight hole, inclined hole, and can be used as drill bit, lathe tool, milling cutter and extensive use.

Claims (1)

1. A center drill, comprising a drill shank, a drill body and a drill top extending downwards sequentially along a central axis, characterized in that: The drill shank is a rod extending along the central axis; The drill body is a tapered rod extending gradually downward along the central axis from a bottom of the drill shank, and has two helical shafts formed around the rod at intervals and spirally rotating around the central axis. Cutting teeth, two helical chip guide surfaces corresponding to one side adjacent to the cutting teeth and radially recessed toward the central axis, and two helical extension surfaces correspondingly connected to the other side of the cutting teeth and between the chip guide surfaces Each cutting tooth has an arc-shaped cutting surface connected to the chip guide surface and the section is open outward, a connecting surface connected to the extending surface and gradually narrowed downward in width, and a drill back connecting the cutting surface and the connecting surface , and a drill edge with a sharp angle formed by the intersection and connection of the cutting surface and the drill back, a guide groove is jointly defined between the cutting surface and the cutting surface, and a side groove is jointly defined between the extension surface and the connecting surface; and The drill top is a pointed cone that protrudes downward from the drill body along the central axis, and has two edge surfaces that spirally extend along the cutting surface of the chip guide surface and the cutting surface of the cutting tooth and are inclined downward, Two lip surfaces that extend helically along the extension surface and the drill back of the cutting tooth and are inclined downward, two cutting edges that are respectively connected to the drill edge and formed between the edge surface and the lip surface, and a static at one end point, the blade surface, lip surface and cutting edge are jointly connected and meet at the static point, and each blade surface defines a radially recessed groove toward the central axis.

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