CN1406700A

CN1406700A - Assembled drill

Info

Publication number: CN1406700A
Application number: CN 01130970
Authority: CN
Inventors: 凯拉什·C.·瓦苏德瓦
Original assignee: MARXTECH MANUFACTURING CORP
Current assignee: MARXTECH MANUFACTURING CORP
Priority date: 2001-08-28
Filing date: 2001-08-28
Publication date: 2003-04-02
Anticipated expiration: 2021-08-28
Also published as: CN100548548C

Abstract

A two parts combined drill bit is composed of a hexagonal holder and a drill bit installed in the axial hole of said hexagonal holder. It features that said axial hole of hexagonal holder and the tail part of drill bit may be the matched fin shape, polygonal shape, conic shape, etc.

Description

Assembled drill

Technical field

The invention relates to assembled drill, form by shank and bit part.

Background technology

Assembled drill is a prior art, is made up of a hexagonal handle usually, and this hexagonal handle will be connected with chuck or clamp mechanism, for example:

(1) the hexagonal handle is cut to needed length, and at axial hole of a brill, shank at common drill bit processes a plane, then, this drill bit packed into go in the hole-drilled hexagonal handle, and, aim at the afterburning extruding in place, plane of drill handle part, so that drill bit can be fastened in the hole of hexagonal handle in the outside of hexagonal handle.This structure has two significant disadvantages at least: at first, owing to can successfully pack into for the shank that guarantees drill bit, the hole in the hexagonal handle must be drilled to bigger slightly than bit sub.Therefore, when reinforcing was unidirectionally extruded, whole hexagonal handle drill bit will form bending.This has just formed the concentricity problem of hexagonal handle and drill bit.Another point, owing to will reinforcing push on a plane of hexagonal handle, this easily makes the unidirectional distortion of hexagon, influences hexagonal precision, does not match with the hexagon pass converter that causes the standard on hexagonal handle drill bit and the market.

(2) the hexagonal handle is cut to desired length, and at one end a hole is bored by portion.Binding agent is added in the hand-hole, in the hole of the hexagonal handle of then handle end of drill bit being packed into, allow just form hexagonal handle drill bit after its adhesive drying, this method can not provide hexagonal handle drill bit to use needed intensity.This is that drill bit can rotate in the hexagonal handle because in the big use of load.

(3) handle of drill bit being put into profile is hexagonal mould, forms required hexagonal handle drill bit with the method (being generally zinc or kirsite) of burning casting then.Owing to burn the hexagonal handle of casting,, and in use repeatedly, can not keep original hexagonal configuration because this hexagonal handle is easy to wear and tear than next soft of general drill bit.In addition, after wearing and tearing, the concentricity of its drill bit and hexagonal handle can be affected.Other shortcoming is exactly in burning casting process, because the problem of mould structure etc. can form unnecessary material (common both sides at the hexagonal handle) on hexagonal surface.These unnecessary materials can make its hexagonal handle that the assembling of chuck etc. is formed difficulty.In use can produce problems such as concentricity, sideslip.

(4) the hexagonal handle is cut into required length, is drilled to a hole at one then, behind the drill bit load hole, bore a hole in the footpath of hexagonal handle direction again, add a pin then to fix its drill bit in the hexagonal handle.To the drill bit of minor diameter, boring one radially behind the sky, the fastening screw screw of packing into need be finished a plurality of procedure of processings with fixedly hexagonal handle and drill bit owing to this method, and the method is time-consuming, and very expensive.In addition, this method be because assembling can produce the inaccurate and hexagonal handle of the concentricity problems such as anchor clamps or converter difficulty of packing into, and especially situation about not polishing at pin and holding screw is even more serious.

Summary of the invention

The purpose of this invention is to provide new construction a kind of economy, effective assembled drill, and manufacture method.

In the present invention, the end at the handle of a regular hexagon bores an axial hole.Hold most shank to pack in this hole at drill bit, by one or more mechanical systems drill bit and hexagonal handle are fixed then, relevant these mechanical mode can have more specific description below.

In the examples of implementation of an optimum, be processed into annular knurl shape in the part of boring first termination at least, the hexagonal shank of then annular knurl drill bit one end being packed into, and compress, compress as method by roll extrusion or hammering.

In the method for this invention, be processed into annular knurl in the end of a drill bit at least, and bore an axial hole in the end of the shank (hexagonal handle) of certain-length.Then the drill bit of annular knurl one end is packed in the hole that handle is drilled to,, compressing bit part, make the swelling pressure of splashing tight as roll extrusion, hammering or by heating and cooling at least at a part of handle the symmetric extruding handle of method with machinery.

During can illustrating below, the present invention's some other characteristic sets forth or these characteristics can significantly be set up.

Description of drawings

To example with reference to the accompanying drawings below, detailed explanation is done in invention.

1A is the part sectioned view based on the side view of first kind of embodiment of the drill bit of invention;

1B is the side view of the drill bit of Figure 1A;

1C is the side view of the bit part of Figure 1A;

1D is the end-view of Fig. 1 C, and there is annular knurl the end that is presented at drill bit;

1E is the side view of various bit part among first embodiment;

1F is for being the cutaway view of Fig. 1 E;

2A is the partial sectional view based on the drill bit of second embodiment of invention;

2B is the side view of the drill bit of Fig. 2 A;

2C is the side view of the bit part of Fig. 2 A;

2D is the end-view of the drill bit of Fig. 2 C, shows that there is annular knurl the drill bit end;

3A is the side view of the hexagonal handle of Figure 1A;

3B is the lateral sectional view of the hexagonal handle of Fig. 3 A;

3C be the end of a hexagonal handle of Fig. 3 B to figure, can see the hexagonal handle that will bore an axial hole from the end;

3D is the hexagonal handle side view of Fig. 3 A, therefrom can see the axial hole that processes;

3E is the side sectional view of the hexagonal handle of Fig. 3 D;

3F is the end-view of the hexagonal handle of Fig. 3 D, therefrom can see the axial hole that processes;

4A is a side view based on the drill bit of the third embodiment of the present invention;

4B is the end view drawing of Fig. 4 A, and an end that demonstrates at drill bit has annular knurl;

5A is a side view based on the drill bit of the 4th kind of embodiment of the present invention;

5B is an end-view of Fig. 5 A drill bit, shows the annular knurl of an end of drill bit;

6A is a side elevation in partial section based on the drill bit of the 5th kind of embodiment of the present invention;

6B is the side view of the drill bit of Fig. 6 A;

7A is the side view of the 6th kind of embodiment of the present invention;

7B is the end-view of Fig. 7 A, shows the drill bit of wing;

8A is the partial cut away side views of the 7th kind of embodiment of the present invention;

8B is the side view of Fig. 8 A;

8C is the end-view of Fig. 8 B, shows the polygon-shaped of drill handle part;

9A is the side view of the 8th kind of embodiment of the present invention;

9B is the partial cut away side views of Fig. 9 A;

10A is the cross sectional side view of the gradient axial hole of shank;

10B is the end-view of Figure 10 A;

10C is the partial cut away side views after assembling;

10D is the side view after assembling;

10E is the side view of bit part;

11A is the cross sectional side view of gradient axial hole of handle and annular knurl;

11B is the end-view of Figure 11 A;

11C is the partial cut away side views of assembling back drill bit;

11D is the side view after assembling;

11E is the side view of bit part;

12A is the profile that handle has the annular knurl of gradient axial hole and other form;

12B is the side view of Figure 12 A.

The specific embodiment

Assembled drill is made up of drill bit (10) and hexagonal shank portion (20).The top of the drill bit shank end face of packing into has in the axial hole, though in the application of some reality, the shape of handle can not be a hexagon, but other shape is with the chuck that is adapted to other or the application of converter, and hexagon is preferentially oldly to consider.This hexagonal shank can be adapted to hexagonal converter or traditional chuck.Just as we all know, this converter be with the structure of spring and ball by the groove (24) on the fixing hexagonal handle, thereby pin this drill bit.

In the embodiment of optimum, shown in Figure 1A-1D, be processed into annular knurl (12) on the top of the close shank of drill bit.Be preferably in its top and do tapered guiding, do not have annular knurl above, so as drill bit can be better in packing into of the heart axial hole.The groove (24) that a circumferencial direction is preferably arranged on the shank, so that the device (not shown) on converter or the chuck can lock drill bit with this groove, the spring of for example mentioning in front, ball mechanism.The other end at bit part has ditch and cutting head, to constitute traditional drill bit.

In one of different embodiment, Fig. 1 E and 1F, the bit head top ends has the part (12) of two sections annular knurls, and these two sections knurled portions separate (13) by a bit of non-knurled portions.After drill bit is packed in the axial hole of hexagonal handle fully, on the hexagonal handle, fasten and form a lock slots (23) by edging pressure handle drill bit.This lock slots is preferably just in time aimed at the part (13) of non-annular knurl on the drill bit.As with roll extrusion or roll the method for hitting (23), the position of its roll extrusion can be in the end of hexagonal handle, shown in Fig. 2 B.

In the process of this drill bit of processing, drill bit is made in advance, and just bit part carries out annular knurl on edge knurling machine.The hexagonal handle is cutting forming or is made by the hexagonal bar of standard, for example, uses saw at a high speed, single-spindle machine, and the stamping machine of the full-length that perhaps sets is 1.264 inches or 32 millimeters.In ideal conditions, the hexagonal handle that is cut into is put into grinding machine for grinding, to remove surperficial burr etc.Pack into hopper or have in the dish of vibration of the hexagonal handle that is cut into is sent into the building-block machine of chamfering and working groove then automatically, and this combined type lathe is clamping automatically.Circumferential groove (24) machine-shaping on the machine of here.Though this circumferential groove is optional, this groove is many standard feature that the hexagonal head instrument is arranged.As select to process this groove, the groove of this circumference must come production and processing according to the standard (B107.4M-1995) of U.S. mark office or american society of mechanical engineering.Though not necessarily will be by this processing sequence, processing sequence can be chamfering, machined surface, working groove.

Holddown groove on drill bit (23) preferably processes earlier, so that the non-annular knurl (13) that it can be rolled into drill bit (10) is located.Handle (20) is at first processed a centre bore (26), and the starting point of axial hole (25) can be determined in this center.Then, axial hole is processed into to the correct degree of depth (can be that in two steps or more multistep or the mode that progressively increases diameter are finished).The termination of bit part (10) axial hole of packing into advances roll extrusion along drill bit then on the hexagonal handle, as above-mentioned said, this roll extrusion is to carry out at the holddown groove place of drill bit.The diameter of axial hole preferably with the friction tight optimum diameter of drill bit before roll extrusion.

If the hexagonal handle is heated before assembling, its axial hole is increased, to be adapted to the cooperation of drill bit, this can be better.Same purpose, the shank of bit head can be cooled off its diameter is reduced.Also can use the situation of two kinds of combinations.Just to hexagonal handle heating and to the shank cooling processing of drill bit.

To the processing of embodiments of the invention and assembling can use multistation or the bull lathe is finished.

Processing method of the present invention can avoid how guaranteeing in the hexagonal handle drill bit assembling process the matching common issue with of integrity of part.Drill bit fixing in handle guaranteed in roll extrusion on the hexagonal handle, also guarantees that drill bit is not axially moving simultaneously.No matter this roll extrusion is carried out at the middle part or is carried out in the end.Because annular knurl is arranged on drill bit, drill bit can not rotate in the hexagonal handle, and in addition because this assembling does not have punching press or other big impact to be fixed in the handle to guarantee drill bit, therefore this drill bit can rotate relative to the axle center of correct power tool on the edge.High impulsive force can cause the distortion of part and easily become substandard products.

Traditional processing mode and assembling need each procedure of processing is carried out clamping, so this is with regard to easy generation concentricity and eccentric problem, because process of the present invention is to carry out on multi-functional lathe, thereby does not need the process of multiple clamping workpiece.So just can guarantee the uniformity of concentricity and the problem of avoiding any off-centre.

Fig. 2 A has represented second embodiment to 2D, in this embodiment, has increased the length (12) of annular knurl still in the scope of handle (20) in the end (10) of drill bit.

Fig. 3 A has represented handle (20) and its process to 3F, comprises the step in advance that begins boring (26) of preferred consideration.

Fig. 4 A has shown the third embodiment of the present invention to 4B, and there is a head (13) on the top of drill bit, and the cross section of this part is a polygon.After rolling and processing, this polygonal head can further stop drill bit to rotate in axial hole.

Fig. 5 A represents that to 5B the 4th kind of embodiment of the present invention has a non-knurled portions (13) at an end of drill bit, and replaces there to be some to stretch out wing leaf (15), and these wings can further stop drill bit to rotate in axial hole after the roll extrusion.

Fig. 6 A is the drill bit of the 5th kind of embodiment of drill bit of the present invention to 6B.There is this groove of a groove (16) consistent at the drill bit end portion,, can makes drill bit can be fixed on shank like this so that the material of shank can flow in this groove with the position of shank roll extrusion.

Fig. 7 A to 7B is the drill bit of the 6th kind of embodiment of the present invention.The wing leaf (17) that some toothed points are arranged in the end of drill bit.These wing leaves can stop the rotation of drill bit and prevent moving axially of drill bit behind rolling technology.Be easy to simultaneously the handle of before roll extrusion, packing into again.

Fig. 8 A to 8C is the drill bit of the 7th kind of embodiment of the present invention.There is polygonal shape end at drill bit.This polygon can stop after roll extrusion in the axial hole of drill bit in handle and rotates.Simultaneously before roll extrusion, be easy to again pack into.

Fig. 9 A to 9B is the drill bit of the 8th kind of embodiment of the present invention.Concerning the above relatively embodiment that sets forth, the drill bit in the present embodiment has bigger size (10), and its shank (20) has standard size part (21) and large-sized part (22).The end of drill bit is polygon-shaped, and this is easy to after rolling and processing, stops the rotation of drill bit in axial hole, but is easy to pack into before rolling and processing.

In the 9th kind of embodiment shown in the 10E, visible axial hole (25) has gradient as Figure 10 A.The end of drill bit (10) is also made gradient accordingly.The form of bit part can be that any form is mentioned in the front, as can comprising the shank after the heating, but is preferably the part (12) of the annular knurl among the embodiment as previously mentioned, in all embodiment, as Figure 12 A and 12B, realizes by annular knurl (12 ').This annular knurl is not necessarily wanted axial annular knurl, and it can be the annular knurl of cross modal, shown in Figure 12 A and 12B.

Above-mentioned explanation is only described with example, preferential embodiment, but clearly, under the situation of not leaving essence of the present invention, these knowledge of basic this area also have many corresponding situations to be fine.In above-mentioned elaboration whether these situations are in this scope of invention, no matter be.

Claims

1. the drill bit of two combinations, form by handle and bit head, it is characterized in that its handle has an end to connect usefulness, the other end has an axial hole, this hole is the usefulness that is used to adorn the handle of bit head, the handle of this bit head has at least one section to be processed into by annular knurl, carries out tight roll extrusion in the outside of handle facing to the part of the handle of drill bit and forms.

2. drill bit as claimed in claim 1 is characterized in that bit head has two sections annular knurls, and the centre is made up of non-knurled segment.

3. drill bit as claimed in claim 1 is characterized in that the edge of its non-knurled portions near bit head.

4. drill bit as claimed in claim 1 is characterized in that the tight roll extrusion of shank of the aligning bit head of shank is by roll extrusion, hammering, roll hit, punching press, and by a kind of composition the in the mode of heat, cold deformation.

5. drill bit as claimed in claim 1 is characterized in that its axial hole is gradient, and the shank of the bit head that it is corresponding is also gradient.

6. drill bit as claimed in claim 5 is characterized in that the part of annular knurl is separated by non-knurled portions.

7. drill bit as claimed in claim 5 is characterized in that non-knurled segment is arranged in the top near handle.

8. drill bit as claimed in claim 5 is characterized in that handle can be a kind of in the following technical process corresponding to the process of pressing of drill handle part: roll extrusion, hammering, roll hammering, punching press and because the compression of the variation of hot cold process.

9. drill bit as claimed in claim 1, the head that it is characterized in that handle has the cross section of certain size, and at the other end large-sized cross section is arranged, so that large diameter brill can be packed in this seedstalk, because as do not have large-sized cross section, major diameter just can not be packed at drill bit.

10. two knockdown drill bits are made up of handle and drill bit, and its handle has near-end, are used for connecting and the top, on the top axial hole are arranged so that pack drill bit into, it is characterized in that proximal part has irregular cross section, and the near-end of the relative drill bit of handle presses processing.

11. drill bit as claimed in claim 10 is characterized in that erose cross section, can be the radially wing leaf that outwards stretches, crozier radially and the polygon that outwards stretches.

12. drill bit as claimed in claim 11, its special footpath are to do to press processing on handle, can be roll extrusion, hammering, roll hit, punching press and hot cold treatment.

13. two knockdown drill bits, form by handle and drill bit, its handle has close end to be used for connecting, and top, on the top axial hole is arranged so that pack drill bit into, it is characterized in that its axial hole is gradient, the shank of drill bit also has corresponding gradient, and handle and the drill bit of packing into are close to press and give in connection.

14. drill bit as claimed in claim 13 is characterized in that the shank of drill bit has at least one section annular knurl.

15. the manufacture method of an assembled drill of being made up of drill bit and handle, its handle have near-end to be used for installing and connecting, there is the axial hole of dress drill bit on the top, it is characterized in that processing method is made up of following several steps:

At least one section annular knurl of near-end processing at the handle of drill bit;

The handle of certain-length is provided;

Add an axial hole on the top of handle;

The near-end of the handle of drill bit is packed in the axial hole of handle.

16. processing method as claimed in claim 15 is characterized in that its processing method has further procedure of processing: after the near-end of drill bit is packed the axial hole of handle into, with mode at least one place on handle of mechanically deform doing symmetric compression.

17. processing method as claimed in claim 15 is characterized in that the shank of described axial hole and drill bit is all made gradient.

18. processing method as claimed in claim 17 is characterized in that its processing method has further procedure of processing, after the near-end of drill bit is packed the axial hole of handle into, with mode at least one place on handle of tool tool distortion doing the symmetry compression.