CN209830519U - Screw tap with replaceable head - Google Patents

Screw tap with replaceable head Download PDF

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Publication number
CN209830519U
CN209830519U CN201920610273.6U CN201920610273U CN209830519U CN 209830519 U CN209830519 U CN 209830519U CN 201920610273 U CN201920610273 U CN 201920610273U CN 209830519 U CN209830519 U CN 209830519U
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China
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head
tap
screw
taper
screw tap
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CN201920610273.6U
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Chinese (zh)
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阎杰
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Individual
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Individual
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Abstract

The utility model discloses a head-replaceable screw tap, which belongs to the field of mechanical tools and comprises a handle, wherein one end of the handle is provided with a positioning taper rod arranged coaxially, one end of the positioning taper rod and the handle are integrally formed, and the outer side wall of the positioning taper rod is an elliptical outer conical surface; the screw tap head, screw tap head one end be equipped with location taper hole of location taper pole matched with, the inside oval inner cone that is of location taper hole, the location taper pole is arranged in the location taper hole, oval outer conical surface with oval inner cone butt, the screw tap head with handle of a knife threaded connection. The beneficial effects of the utility model are that this screw tap can change the screw tap head, only needs to change the screw tap head after the screw tap head wearing and tearing or bursting apart damage to make the handle of a knife obtain remaining, reduce screw tap material and manufacturing cost, simple structure has simultaneously, and processing is convenient, fixes a position accurately, reliable and stable.

Description

Screw tap with replaceable head
Technical Field
The utility model belongs to the mechanical tool field, concretely relates to interchangeable first screw tap.
Background
The current common screw tap adopts an integrated form, namely, a handle part and a cutting part of the screw tap are integrated and are made of the same material. When the cutting edge of the working part of the tap is damaged, the whole tap has to be replaced, the service life is short, and the cost of the tool is high, so that the cutting part and the handle part of the tap are considered to be made into a single detachable unit, namely a 'replaceable head' form commonly known by a person skilled in the art. The replaceable head part can be conveniently replaced after being worn or cracked, so that the expensive cutter body can be used for a longer time, and the screw tap head can be conveniently taken out of a threaded hole of a workpiece after being cracked and broken in the machining process; the replaceable head part can be made of materials such as hard alloy or high-performance high-speed steel, the cost of the cutter can be considered according to the processed materials, the cutter body can be made of materials with higher toughness such as 40Cr after heat treatment, and the hardness is 40-50 HRC.
The screw tap 201520311500.7 disclosed in the chinese patent literature includes straight shank portion and the screw tap head that is the tube-shape, is equipped with the cutting edge on the lateral wall of screw tap head, and the lateral wall axial is equipped with the chip groove, and the inner chamber is regular polygon, and the tip of straight shank portion matches with the cavity phase-match of screw tap head, and it has a plurality of magnets to inlay on the lateral wall of straight shank portion. The screw tap head is adsorbed on the straight shank part by the magnet, the screw is connected with the bottom of the chip groove in a threaded manner, the inner end of the screw is pressed on the straight shank part to enable the screw tap head to be convenient to replace, and the straight shank part and the screw tap head are convenient to replace. However, the screw tap has some defects, the screw tap head and the straight shank are embedded in a regular polygon inner cavity to be circumferentially and fixedly connected, stress concentration exists, and the strength of the cutter is influenced; certain play makes the axiality location unstable.
A carbide composite tap that china patent literature disclosed, 201510078991.X, including pole portion and cutting portion, the cutting portion is two-layer inside and outside, the inlayer of cutting portion and pole portion are by steel material integrated into one piece, the skin of cutting portion is the outer lane that has the cutting edge, the skin of cutting portion is made by carbide material, form a whole through the welding between the inside and outside two-layer of cutting portion, the structure that the welding formed means has higher requirement to welding process, the cutting portion can't quick replacement after damaging simultaneously.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve above-mentioned technical problem and provide a interchangeable first screw tap, this screw tap can change the screw tap head, only needs to change the screw tap head after the screw tap head wearing and tearing or bursting apart damage to make the handle of a knife obtain reserving, reduce screw tap material and manufacturing cost, have simple structure simultaneously, processing is convenient, fixes a position accurately, reliable and stable.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a head-replaceable screw tap comprises a tool handle, wherein a positioning conical rod is coaxially arranged at one end of the tool handle, one end of the positioning conical rod is integrally formed with the tool handle, and the outer side wall of the positioning conical rod is an elliptical outer conical surface; the screw tap head, screw tap head one end be equipped with location taper hole of location taper pole matched with, the inside oval inner cone that is of location taper hole, the location taper pole is arranged in the location taper hole, oval outer conical surface with oval inner cone butt, the screw tap head with handle of a knife threaded connection.
The utility model has the advantages that: the tool handle and the screw tap head are of a split type and are detachably connected through threads, the screw tap head is convenient to replace, and only the screw tap head needs to be replaced after the screw tap head is worn or broken, so that the tool handle is reserved, and the material and manufacturing cost of the screw tap are reduced; simultaneously through being connected of location taper hole on the tap head and the location taper pole on the handle of a knife, utilize oval outer conical surface and oval inner conical surface closely to cooperate and make radial positioning, circumference location and axial positioning to handle of a knife and tap head, the transmission moment of torsion, the axiality of tap head and handle of a knife is ensured to taper fit, improves the machining precision of tap to make tap head and handle of a knife have certain auto-lock effort, the reducible stress concentration of oval cooperation transmission moment of torsion, such location structure makes the utility model discloses an interchangeable head tap's structure is simplified, and the processing of being convenient for has improved the positioning accuracy.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
The screw tap is characterized by further comprising a fastening screw, a threaded hole is formed in one end, far away from the handle, of the positioning conical rod, a fastening counter bore communicated with the positioning conical hole is formed in one end, far away from the positioning conical rod, of the screw tap head, the fastening screw penetrates through the fastening counter bore and then is in threaded connection with the threaded hole, and the outer wall of the fastening screw is abutted to the inner wall of the fastening counter bore.
The beneficial effect of adopting the further scheme is that: the screw tap head is more convenient to disassemble and replace by matching the fastening screw with the threaded hole.
Furthermore, the fastening screw comprises a fastening screw frustum and a threaded end, the threaded end is positioned on one side where the extended edges of the fastening screw frustum are gathered and fixedly connected with the table top of the fastening screw frustum, the threaded end is rotatably arranged in the threaded hole, and the outer conical surface of the fastening screw frustum is abutted to the inner conical surface of the fastening counter bore.
The beneficial effect of adopting the further scheme is that: and the outer conical surface of the fastening screw frustum is matched with the inner conical surface of the fastening counter bore, so that the screw tap head is firmly connected with the tool shank.
Further, the taper of the outer conical surface of the fastening screw frustum is 1:6, the taper of the inner conical surface of the fastening counter bore is 1:6, and the taper direction of the outer conical surface of the fastening screw frustum is the same as that of the inner conical surface of the fastening counter bore.
The beneficial effect of adopting the further scheme is that: the contact area of the fastening screw and the fastening counter bore is increased.
Further, the taper of the elliptical outer conical surface on the positioning conical rod is 1:30, the taper of the elliptical inner conical surface on the positioning conical hole is 1:30, and the taper direction of the elliptical outer conical surface on the positioning conical rod is the same as the taper direction of the elliptical inner conical surface on the positioning conical hole.
The beneficial effect of adopting the further scheme is that: the coaxiality of the screw tap head and the tool shank is ensured by the taper fit, and the precision of the screw tap in machining is improved.
Further, the taper direction of the inner conical surface of the fastening counter bore is opposite to the taper direction of the elliptical inner conical surface.
The beneficial effect of adopting the further scheme is that: the conical surface of the fastening screw frustum is abutted with the conical surface of the fastening counter bore to generate a self-locking force action in the direction opposite to the self-locking direction between the positioning conical rod and the positioning conical bore, so that the screw tap head and the tool handle are prevented from loosening in work, and the screw tap head and the tool handle are ensured to be firmly connected; meanwhile, the screw tap head is convenient to take out from a threaded hole of a workpiece after being cracked and broken in the machining process.
Further, be equipped with a plurality of handle of a knife chip grooves on the handle of a knife, the tap head be equipped with the tap head chip groove that the handle of a knife chip groove is linked together, tap head chip groove with the handle of a knife chip groove constitutes the curved surface structure.
The beneficial effect of adopting the further scheme is that: the discharge of chips generated when the workpiece is machined by the screw tap is facilitated.
Furthermore, the number of the cutter handle chip grooves is four, the four chip grooves wind the axis of the cutter handle and are circumferentially and uniformly arranged, and the number of the chip grooves of the screw tap head is four, and the four chip grooves wind the axis of the screw tap head and are circumferentially and uniformly arranged.
The beneficial effect of adopting the further scheme is that: the screw tap has better balance for processing the workpiece.
Further, the tap head is made of hard alloy or high-performance high-speed steel.
The beneficial effect of adopting the further scheme is that: the hardness of the screw tap is improved, the wear rate is reduced, the breakage of the screw tap head is reduced, and the cost is reduced.
Drawings
FIG. 1 is an overall front view of the screw tap of the present invention;
FIG. 2 is a front partial sectional view of the screw tap of the present invention;
FIG. 3 is a front partial sectional view of the knife handle of the present invention;
FIG. 4 is a bottom view of the knife handle of the present invention;
fig. 5 is a cross-sectional view of the tap head of the present invention;
fig. 6 is a top view of the tap head of the present invention;
fig. 7 is a partial sectional view of the fastening screw of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the tool comprises a tool shank, 2, a screw tap head, 3, a fastening screw, 11, a positioning taper rod, 12, a tool shank chip groove, 111, an oval outer conical surface, 112, a threaded hole, 21, a positioning taper hole, 22, a screw tap head chip groove, 211, an oval inner conical surface, 212, a fastening counter bore, 31, a fastening screw frustum and 32, and a threaded end.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
Examples
As shown in fig. 1-7, the embodiment provides a screw tap with a replaceable head, which includes a handle 1, a screw tap head 2 and a fastening screw 3, wherein one end of the handle 1 is provided with a positioning tapered rod 11 coaxially arranged, one end of the positioning tapered rod 11 is integrally formed with the handle 1, the positioning tapered rod 11 is matched and fixed with the screw tap head 2, and the screw tap head 2 is positioned so that the screw tap head 2 and the handle 1 coaxially rotate, the other end of the positioning tapered rod 11 is provided with a threaded hole 112, and the outer side wall of the positioning tapered rod 11 is an elliptical outer conical surface 111; one end of the screw tap head 2 is provided with a positioning taper hole 21 matched with the positioning taper rod 11, an elliptical inner conical surface 211 is arranged inside the positioning taper hole 21, the positioning taper rod 11 is arranged in the positioning taper hole 21, the elliptical outer conical surface 111 is abutted to the elliptical inner conical surface 211, and through the matching between the elliptical outer conical surface 111 and the elliptical inner conical surface 211, the radial positioning, the circumferential positioning and the axial positioning of the screw tap head 2 and the knife handle 1 are realized, so that the torque of the knife handle 1 is completely transmitted to the screw tap head 2, the screw tap head 2 can rotate to generate work, and meanwhile, the screw tap head 2 and the knife handle 1 have a certain self-locking acting force; the stress concentration can be reduced by the ellipse matching and torque transmission, the structure of the screw tap with the replaceable head is simplified by the positioning structure, the processing is convenient, the positioning accuracy is improved, and the other end of the screw tap head 2 is provided with a fastening counter bore 212 communicated with the positioning taper hole 21; the fastening screw 3 penetrates through the fastening counter bore 212 and then is in threaded connection with the threaded hole 112, the outer wall of the fastening screw 3 is abutted against the inner wall of the fastening counter bore 212, the screw tap head 2 is connected onto the cutter handle 1 through the fastening screw 3, when the screw tap head 2 is damaged due to machining, the fastening screw 3 is screwed out of the threaded hole 112, the screw tap head 2 is separated from the cutter handle 1, and the screw tap head 2 can be replaced.
Specifically, in this embodiment, the taper of the elliptical outer tapered surface 111 on the positioning tapered rod 11 is 1:30, the taper of the elliptical inner tapered surface 211 on the positioning tapered hole 21 is 1:30, the taper direction of the elliptical outer tapered surface 111 on the positioning tapered rod 11 is the same as the taper direction of the elliptical inner tapered surface 211 on the positioning tapered hole 21, and the taper fitting ensures the coaxiality of the tap head 2 and the tool holder 1, so as to improve the precision of the tap in machining.
Specifically, the fastening screw 3 includes a fastening screw frustum 31 and a threaded end 32, the threaded end 32 is located on one side where the extended edges of the fastening screw frustum 31 converge and is fixedly connected with the table-board of the fastening screw frustum 31, the threaded end 32 is rotatably disposed in the threaded hole 112, and the external conical surface of the fastening screw frustum 31 abuts against the internal conical surface of the fastening counterbore 212. The taper of the outer conical surface of the fastening screw frustum 31 is 1:6, the taper of the inner conical surface of the fastening counter bore 212 is 1:6, the taper direction of the outer conical surface of the fastening screw frustum 31 is the same as that of the inner conical surface of the fastening counter bore 212, the fastening screw 3 applies pressing force to the screw tap head 2 to axially fix the tool holder 1 and the screw tap head 2, meanwhile, the taper fit not only increases the contact area of the fastening screw 3 and the fastening counter bore 212, and as the taper direction of the inner conical surface of the fastening counter bore 212 is opposite to that of the elliptical inner conical surface 211, the conical surface of the fastening screw and the fastening counter bore abut against each other to generate self-locking force action in the opposite direction of self-locking between the positioning conical rod 11 and the positioning conical bore 21, the screw tap head 2 and the tool holder 1 are prevented from loosening in work, and the tool holder screw tap head 2 is ensured to be firmly connected with; the screw tap head 2 is convenient to take out from a screw hole of a workpiece after being cracked and broken in the machining process.
Preferably, in this embodiment be equipped with four handle of a knife chip flutes 12 on handle of a knife 1, four handle of a knife chip flutes 12 wind the axis of handle of a knife 1 becomes circumference and evenly sets up, be equipped with on the tap head 2 with the tap head chip flute 22 that handle of a knife chip flute 12 is linked together, tap head chip flute 22 is four, and four tap head chip flutes 22 equally wind the axis of tap head 2 becomes circumference and evenly sets up, tap head chip flute 22 with handle of a knife chip flute 12 constitutes the curved surface structure. The discharge of chips generated when the workpiece is machined by the tap is facilitated.
Preferably, a gap is reserved between the side face, close to the tap head 2, of the tool holder 1 and the side face of the tap head 2, the positioning taper rod 11 is arranged in the gap between the end face of one end of the positioning taper hole 21 and the end face of the fastening screw frustum 31, provided with the threaded end 32, so that the phenomena of over-positioning and connection insecurity between the tool holder 1 and the tap head 2 are avoided, and the tap head 2 is conveniently taken out of the tool holder 1.
Specifically, the tap head 2 is made of hard alloy or high-performance high-speed steel, and is made of hard alloy materials, so that the hardness of the tap can be improved, and the wear rate can be reduced; the high-performance high-speed steel material is manufactured, can be used for processing general steel, reduces the crack of the screw tap head 2 and reduces the cost; the knife handle 1 can be made of a material with good toughness, so that the rigidity is improved, and the production cost is saved; meanwhile, the utility model can be provided with the screw tap heads 2 with different blade shapes to process workpieces made of different materials, and when the workpieces need to be processed, the screw tap heads 2 can be better arranged on the tool holder 1; meanwhile, only the screw tap head 2 needs to be replaced after the screw tap head 2 is abraded, the whole screw tap does not need to be dismounted from a machine tool, and errors caused by relocation of the screw tap are reduced.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (9)

1. The head-replaceable screw tap is characterized by comprising a screw tap handle (1), wherein one end of the screw tap handle (1) is provided with a positioning conical rod (11) which is coaxially arranged, one end of the positioning conical rod (11) is integrally formed with the screw tap handle (1), and the outer side wall of the positioning conical rod (11) is an oval outer conical surface (111);
the screw tap head (2), screw tap head (2) one end be equipped with location taper hole (21) of location taper pole (11) matched with, location taper hole (21) are inside to be oval interior conical surface (211), location taper pole (11) are arranged in location taper hole (21), oval outer conical surface (111) with oval interior conical surface (211) butt, screw tap head (2) with handle of a knife (1) threaded connection.
2. The screw tap with the replaceable head according to claim 1, further comprising a fastening screw (3), wherein a threaded hole (112) is formed in one end, away from the handle (1), of the positioning conical rod (11), a fastening counter bore (212) communicated with the positioning conical hole (21) is formed in one end, away from the positioning conical rod (11), of the screw tap head (2), the fastening screw (3) penetrates through the fastening counter bore (212) and then is connected to the threaded hole (112) in a threaded mode, and the outer wall of the fastening screw (3) abuts against the inner wall of the fastening counter bore (212).
3. The tap changer according to claim 2, characterized in that the fastening screw (3) comprises a fastening screw cone (31) and a threaded end (32), the threaded end (32) is located on the side where the extended arrises of the fastening screw cone (31) converge and is fixedly connected with the table top of the fastening screw cone (31), the threaded end (32) is rotatably arranged in the threaded hole (112), and the external conical surface of the fastening screw cone (31) abuts against the internal conical surface of the fastening counterbore (212).
4. The replaceable-head tap according to claim 3, wherein the taper of the outer conical surface of the fastening screw frustum (31) is 1:6, the taper of the inner conical surface of the fastening counterbore (212) is 1:6, and the taper direction of the outer conical surface of the fastening screw frustum (31) is the same as the taper direction of the inner conical surface of the fastening counterbore (212).
5. The replaceable-head tap according to claim 4, wherein the taper of the elliptical outer tapered surface (111) on the positioning tapered rod (11) is 1:30, the taper of the elliptical inner tapered surface (211) on the positioning tapered hole (21) is 1:30, and the taper direction of the elliptical outer tapered surface (111) on the positioning tapered rod (11) is the same as the taper direction of the elliptical inner tapered surface (211) on the positioning tapered hole (21).
6. The replaceable head tap according to claim 5, wherein the direction of taper of the internal conical surface of the fastening counterbore (212) is opposite to the direction of taper of the internal elliptical conical surface (211).
7. The tap-changing screw tap according to claim 1, wherein a plurality of tap holder chip flutes (12) are arranged on the tap holder (1), tap head chip flutes (22) communicated with the tap holder chip flutes (12) are arranged on the tap head (2), and the tap head chip flutes (22) and the tap holder chip flutes (12) form a curved surface structure.
8. The replaceable-head tap according to claim 7, wherein the number of shank flutes (12) is four and circumferentially and uniformly arranged around the axis of the shank (1), and the number of tap-head flutes (22) is four and circumferentially and uniformly arranged around the axis of the tap head (2).
9. A nosecone according to any of claims 1 to 8, wherein the nosecone head (2) is made of cemented carbide or high-performance high-speed steel.
CN201920610273.6U 2019-04-29 2019-04-29 Screw tap with replaceable head Active CN209830519U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920610273.6U CN209830519U (en) 2019-04-29 2019-04-29 Screw tap with replaceable head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920610273.6U CN209830519U (en) 2019-04-29 2019-04-29 Screw tap with replaceable head

Publications (1)

Publication Number Publication Date
CN209830519U true CN209830519U (en) 2019-12-24

Family

ID=68914678

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920610273.6U Active CN209830519U (en) 2019-04-29 2019-04-29 Screw tap with replaceable head

Country Status (1)

Country Link
CN (1) CN209830519U (en)

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