CN214023644U - Round pin centering single-limit side pressure locking crown drill bit - Google Patents
Round pin centering single-limit side pressure locking crown drill bit Download PDFInfo
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- CN214023644U CN214023644U CN202022342151.9U CN202022342151U CN214023644U CN 214023644 U CN214023644 U CN 214023644U CN 202022342151 U CN202022342151 U CN 202022342151U CN 214023644 U CN214023644 U CN 214023644U
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Abstract
The utility model relates to a round pin centering single limit side pressure locking crown drill bit, the drilling rod includes the working portion of coaxial setting in proper order from left to right, neck and stalk portion, establish chip groove and back of a knife blade in the working portion, the entity part that removes the chip groove in the working portion is the back of a knife blade, the inscribed circle of back of a knife blade central authorities is thick for the drill rod core, the inside main cooling hole that transversely runs through the export and be the Y type of drilling rod, drilling rod left end middle part is equipped with the cylindric lock locating hole, cylindric lock locating hole side sets up the fastening screw hole, the top that the cylindric lock locating hole was kept away from to the fastening screw hole sets up the counter bore, the axis of counter bore does not coincide with the axis of bottom fastening screw hole, the cylindric lock of crown tool bit stretches into in the cylindrical lock locating hole, locking screw in fastening screw hole and produce frictional force with the counter bore, the crown tool bit fastens on the drilling rod through the locking screw is detachable. The utility model provides a round pin centering single limit side pressure locking tooth crown drill bit adopts eccentric fastening design, and positioning accuracy is high, and locking not hard up, it is convenient to load and unload, practices thrift the tool changing time.
Description
Technical Field
The utility model belongs to the technical field of accurate high-efficient metal cutting tool, concretely relates to round pin centering single spacing side pressure locking crown drill bit.
Background
In recent years, with the rapid development of the industries such as engineering machinery, wind power and the like, the large-diameter holes are processed more and more, but the whole hard alloy drill bit for processing the existing large-diameter holes is expensive and high in processing cost, so that a crown drill bit is researched to replace the existing hard alloy drill bit, the crown drill bit is a combined drill bit with a head made of hard alloy or other high-performance materials and a drill rod made of alloy steel materials, is suitable for processing the large-diameter holes, and has the advantages of low use cost, large processing range and the like. At present, the head and the drilling rod of the crown bit have multiple combination modes, but most of the structures are complex, the manufacturing cost is high, and therefore, the combination mode of the crown bit, which is novel, efficient, low in cost and high in precision, is sought, and the combination mode has important practical significance.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem that exists among the prior art, the utility model aims to provide a round pin centering single spacing side pressure locking crown drill bit has simple structure, centering precision height, presss from both sides tight reliable, low cost's characteristics.
In order to realize the above purpose, reach above-mentioned technological effect, the utility model discloses a technical scheme be:
a round pin centering single-limit side pressure locking crown drill bit comprises a drill rod and a crown cutter head, wherein the drill rod comprises a working part which is coaxially arranged from left to right in sequence, neck and stalk portion, set up spiral helicine chip groove and back of a knife blade on the working portion, the entity part that removes the chip groove on the working portion is the back of a knife blade, the inscribed circle of back of a knife blade central authorities is thick for the drilling rod core, the inside main cooling hole that transversely runs through the export and be the Y type of drilling rod, drilling rod left end middle part is equipped with the cylindric lock locating hole, cylindric lock locating hole side sets up the fastening screw hole, the top that the cylindric lock locating hole was kept away from in the fastening screw hole sets up the counter bore, the axis of counter bore does not coincide with the axis in bottom fastening screw hole, the cylindric lock of crown tool bit stretches into in the cylindric lock locating hole, locking screw in fastening screw hole and produce frictional force with the counter bore, the crown tool bit passes through the detachable fastening of locking screw on the drilling rod.
Furthermore, the eccentricity between the central axis of the counter bore and the central axis of the bottom fastening screw hole is 0.005-0.1 mm.
Furthermore, the spiral angle of the chip groove is 0-35 degrees, and the width of the knife back is the same as that of the chip groove.
Furthermore, the cylindrical pin locking surface of the crown cutter head is an inclined surface, the included angle between the plane where the cylindrical pin locking surface is located and the central axis of the drill rod is 20-60 degrees, and when the locking screw is screwed into a fastening screw hole formed in the drill rod and fastens the crown cutter head, the locking screw is in contact with the locking surface of the crown cutter head.
Furthermore, the main cooling hole transversely penetrates through the center of the interior of the drill rod, two outlets are formed in the left end face of the drill rod through the main cooling hole, and the main cooling hole and the two outlets form a Y-shaped structure.
Furthermore, the neck comprises a conical body part and a cylindrical body part which are sequentially connected from left to right and are coaxial.
Further, the handle is of a cylindrical structure.
Compared with the prior art, the beneficial effects of the utility model are that:
the positioning is carried out through the cylindrical pin positioning hole, the side surface is subjected to anti-loosening fixing position through the locking screw, the positioning precision of the cylindrical pin positioning mode is high, the assembling precision of the crown bit and the drill rod is high, the production is simple, and the precision is easy to guarantee;
the main cooling hole is of a Y-shaped structure, the machining is simple and convenient, the cooling effect is good, the manufacturing cost is low, the generalization of the groove type of the drill rod is facilitated, one groove type can be suitable for different machined materials, the design scheme of the groove type is reduced, and the design is simplified; the main cooling holes are symmetrically designed, so that the drill rod is well balanced, the vibration is small during high-speed cutting, and the service life of a drilled hole is long;
the drill rod core is thick, the drill rod strength is high, the drilling efficiency is high under the condition of not influencing chip removal, and the drilling quality is good;
by adopting an eccentric fastening design, the situation that the drill bit cannot be locked and fall off due to the installation error of the lateral pressure locking surface of the drill bit is effectively prevented;
the central axis of the counter bore is eccentric to the central axis of the bottom fastening screw hole, so that the friction force of the locking screw can be increased, and the locking screw is prevented from loosening in the drilling process; the single screw is adopted for locking, the drill bit is convenient to assemble and disassemble, the operation is simple, and the tool changing time is saved;
the locking surface of the crown bit is an inclined surface, which is helpful for the drill bit to be locked more and more.
Drawings
Fig. 1 is a schematic perspective view of the present invention;
fig. 2 is a schematic perspective view of the drill rod of the present invention;
fig. 3 is a schematic three-dimensional structure view of the crown bit of the present invention;
FIG. 4 is a schematic structural view of the present invention;
fig. 5 is a left side view of the present invention;
fig. 6 is a cross-sectional view taken along line a-a of fig. 4 in accordance with the present invention;
fig. 7 is a schematic structural view of the drill rod of the present invention;
fig. 8 is a cross-sectional view taken along line B-B of fig. 7 in accordance with the present invention.
Fig. 9 is a schematic structural view of the crown bit of the present invention;
fig. 10 is a schematic view of the structure of the chip groove and the back of the present invention;
fig. 11 is a left side view of the present invention.
Detailed Description
The embodiments of the present invention are described in detail below to make the advantages and features of the present invention easier to understand by those skilled in the art, thereby making more clear and definite definitions of the protection scope of the present invention.
As shown in figures 1-11, a round pin centering single-limit side pressure locking crown drill bit comprises a drill rod 1, a crown bit 2 and a locking screw 3, wherein the crown bit 2 is positioned by a cylindrical pin and is eccentrically fastened on the drill rod 1 through the locking screw 3, specifically, a cylindrical pin positioning hole 12 is arranged in the middle of the left end face of the drill rod 1 for realizing the positioning of the crown bit 2, a fastening screw hole 13 is arranged on one side face of the cylindrical pin positioning hole 12, a counter bore 14 is arranged on one side (top) of the fastening screw hole 13 away from the cylindrical pin positioning hole 12, the central axis of the counter bore 14 is eccentric to the central axis of a bottom fastening screw hole 13, the eccentricity H is 0.005-0.1 mm, during assembly, the crown bit 2 is inserted into the cylindrical pin positioning hole 12 of the drill rod 1, the locking screw 3 is screwed into the fastening screw hole 13 and is connected with a locking surface 15 of the crown bit 2 until the crown bit 2 is tightly fixed on the drill rod 1, when the locking screw 3 is screwed into the fastening screw hole 13, a certain friction force is generated between the locking screw and the counter bore 14 to eccentrically fasten the crown bit 2, the locking surface 15 of the crown bit 2 is an inclined surface, and the included angle between the plane where the locking screw is located and the central axis of the drill rod 1 is 20-60 degrees.
The drill rod 1 is of a coaxial cylinder structure formed by a working portion 4, a neck portion 5 and a handle portion 6 from left to right and taking the same central axis as a central line, a spiral chip removal groove 7 and a cutter back 8 are arranged on the working portion 4, the chip removal groove 7 plays a role in chip containing and removing during working, the solid portion of the working portion 4 except the chip removal groove 7 is called the cutter back 8, the spiral angle of the chip removal groove 7 is 0-35 degrees, left and right rotation is achieved, the width of the cutter back 8 is the same as that of the chip removal groove 7, the inner tangent circle in the center of the cutter back 8 is the drill rod core thickness 9, the core thickness is 25-40 percent of the diameter of the outer circle of the drill rod 1, the core thickness is larger, the strength is higher, the feeding speed is higher during working, the core thickness is smaller, the cutter back 8 of the solid portion is narrower, the rigidity of the working portion 4 is poorer, and the further improvement of the feeding speed is limited.
A main cooling hole 10 penetrates through the middle part of the drill rod 1, and the outlet of the main cooling hole 10 is Y-shaped as shown in figures 2 and 4; the main cooling holes 10 are located inside the drill rod core thickness 9, as shown in fig. 3. Specifically, the main cooling hole 10 is provided with two outlets 11 on the left end surface of the working portion 4, and a Y-shaped structure is formed between the main cooling hole 10 and the two outlets 11, so as to supply the coolant to the crown bit 2 during operation.
The neck part 5 is a combination body consisting of a conical body part and a cylindrical body part which are sequentially connected from left to right and are coaxial, so that during working, chips can be prevented from splashing and impacting the tool handle and the machine tool spindle, and a protection effect is achieved.
The handle part 6 is a section of cylinder structure with high circular precision, and the handle part 6 is clamped by the tool holder to transmit power of the machine tool during use, so that the tool rotates and has cutting capacity. A main cooling hole 10 extends through the central axis of the shank 6 and delivers coolant from the machine tool cooling system to the tool.
As a specific implementation mode, the crown gear cutter head 2 of the utility model comprises a guide surface 25, a locking surface 26, a cylindrical pin 27, a bottom surface 28, a transition surface 29 and a vertex angle 210, the cylindrical pin 27 is provided with the locking surface 26, the inclined plane center of the locking surface 26 coincides with the central axis of a locking screw 3, the included angle between the plane where the locking surface 26 is located and the central axis of the drill rod 1 forms an acute angle, one side (right side) of the cylindrical pin 27 gradually shrinks to form the guide surface 25, the width and the angle of the guide surface 25 are 0.2-1 x 30 degrees, the installation is convenient to play a guiding role, the other side opposite to the cylindrical pin 27 forms the bottom surface 28, the bottom surface 28 is perpendicular to the central axis of the drill rod 1, the central axis of the cylindrical pin 27 does not coincide with the central axes of two side surface backs 218 formed by the upper and lower sides of the bottom surface 28, one side of the bottom surface 28 far away from the cylindrical pin 27 is ground to form the vertex angle 210 and a chip groove 211, the vertex angle 210 is a right angle or an obtuse angle, between the top corner 210 and the bottom 28, an edge 24 and a transition surface 29 are provided.
The manufacturing process of the crown gear cutter head 2 comprises the following steps:
during manufacturing, the cylindrical pin 27, the guide surface 25, the transition surface 29 and the large outer circle diameter 214 are ground to form the bottom surface 28, and at the moment, the central axes of the two side surface backs 218 formed by the upper side and the lower side of the cylindrical pin 27 and the bottom surface 28 do not coincide with the central axis of the drill rod 1; grinding the locking surface 26, the bottom surface 28 and the vertex angle 210 by taking the cylindrical pin 27 as a reference, wherein the included angle between the locking surface 26 and the central axis of the drill rod 1 is 20-60 degrees, the bottom surface 28 is perpendicular to the central axis of the drill rod 1, and the angle a of the vertex angle 210 is 90-180 degrees; grinding the two side surface backs 218 formed on the upper side and the lower side of the bottom surface 28 to enable the central axes of the two side surface backs 218 and the central axes of the cylindrical pins 27 to be asymmetric, wherein the eccentricity H1 is 0.05-0.2 mm, and the central axes of the cylindrical pins 27 are higher than the central axes of the two side surface backs 218 formed on the two sides of the bottom surface; and then the chip grooves 211 and the back 213 are ground to form an edge 24, and the spiral angle 212 of the chip grooves 211 is 0-35 degrees.
Grinding a main edge 217 and an inner edge 215 of the vertex angle 210, forming a transition edge 216 between the main edge 217 and the inner edge 215, wherein the length of the inner edge 215 is 1/4-1/2 of the main edge 217, and the arc size of the transition edge 216 is R0.1-3 mm.
The utility model discloses the part of not specifically describing adopt prior art can, do not describe here any more.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (7)
1. A round pin centering single-limit side pressure locking crown drill bit is characterized by comprising a drill rod and a crown cutter head, the drilling rod includes the working portion that sets up coaxially in proper order from left to right, neck and stalk portion, set up spiral helicine chip groove and back of a knife blade on the working portion, the entity part that removes the chip groove on the working portion is the back of a knife blade, the inscribed circle of back of a knife blade central authorities is thick for the drilling rod core, the inside main cooling hole that transversely runs through the export and be the Y type of drilling rod, drilling rod left end middle part is equipped with the cylindric lock locating hole, cylindric lock locating hole side sets up the fastening screw hole, the top that the cylindric lock locating hole was kept away from in the fastening screw hole sets up the counter bore, the axis of counter bore does not coincide with the axis in bottom fastening screw hole, the cylindric lock of crown tool bit stretches into in the cylindrical lock locating hole, locking screw in fastening screw hole and with counter bore production frictional force, the crown tool bit passes through the detachable fastening of locking screw on the drilling rod.
2. The round pin centering single-limit side pressure locking crown drill bit as claimed in claim 1, wherein the eccentricity between the central axis of the counter bore and the central axis of the bottom fastening screw hole is 0.005-0.1 mm.
3. The round pin centering single-limit lateral pressure locking crown drill according to claim 1, wherein the helix angle of the chip groove is 0-35 °, and the width of the back of the cutter is the same as the width of the chip groove.
4. The round pin centering single-limit side pressure locking crown drill bit according to claim 1, wherein the cylindrical pin locking surface of the crown bit is an inclined surface, the included angle between the plane where the cylindrical pin locking surface is located and the central axis of the drill rod is 20-60 degrees, and when the locking screw is screwed into the fastening screw hole formed in the drill rod and the crown bit is fastened, the locking screw is in contact with the locking surface of the crown bit.
5. The round pin centering single-limit side pressure locking crown drill bit as claimed in claim 1, wherein the main cooling hole transversely penetrates through the center position inside the drill rod, the main cooling hole is provided with two outlets on the left end surface of the drill rod, and the main cooling hole and the two outlets form a Y-shaped structure.
6. The round pin centering single limit side pressure locking crown drill according to claim 1, wherein the neck portion comprises a conical body portion and a cylindrical body portion which are connected and coaxial in sequence from left to right.
7. The round pin centering single point side pressure locking crown drill according to claim 1, wherein said shank portion is of cylindrical configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022342151.9U CN214023644U (en) | 2020-10-20 | 2020-10-20 | Round pin centering single-limit side pressure locking crown drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022342151.9U CN214023644U (en) | 2020-10-20 | 2020-10-20 | Round pin centering single-limit side pressure locking crown drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214023644U true CN214023644U (en) | 2021-08-24 |
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ID=77353468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022342151.9U Active CN214023644U (en) | 2020-10-20 | 2020-10-20 | Round pin centering single-limit side pressure locking crown drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214023644U (en) |
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2020
- 2020-10-20 CN CN202022342151.9U patent/CN214023644U/en active Active
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