CN214185988U - Processing cutter of cascaded high accuracy minor diameter deep hole class casing - Google Patents
Processing cutter of cascaded high accuracy minor diameter deep hole class casing Download PDFInfo
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- CN214185988U CN214185988U CN202022998899.4U CN202022998899U CN214185988U CN 214185988 U CN214185988 U CN 214185988U CN 202022998899 U CN202022998899 U CN 202022998899U CN 214185988 U CN214185988 U CN 214185988U
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Abstract
The utility model discloses a processing cutter of cascaded high accuracy minor diameter deep hole class casing, this processing cutter include coaxial setting and integrated into one piece's handle of a knife, cutter arbor and blade, the handle of a knife is the ladder cylinder size of compriseing first cylinder and second cylinder, and the cutter arbor is the cylinder size, and the front end of cutter arbor is the blade, and the cutter arbor is equipped with the transition inclined plane with the junction of blade, the blade includes rake face, main cutting edge, vice cutting edge. The utility model discloses the handle of a knife of processing cutter is cascaded, has strengthened the rigidity of boring cutter in the at utmost when interfering when can effectively avoid the cutting. Meanwhile, the cutter adopts a form of a larger front angle, so that the cutting deformation and the cutting force are reduced, the stability of boring processing is further ensured, the boring processing can bear larger cutting torque, the bending and vibration phenomena are avoided, the processing of a high coaxial precision hole is ensured to be realized, and the technical requirement of high coaxial precision of a product is met.
Description
Technical Field
The utility model relates to the field of machining, especially, relate to a processing cutter of cascaded high accuracy minor diameter deep hole class casing.
Background
The design precision of the stepped high-precision small-diameter deep-hole shell (figure 1) is very high, and the difficulty lies in how to ensure the minimum aperture
The machining depth is 18.6 +/-0.1 mm. Requiring both the small hole and two stepped holes and
the coaxiality between the outer circles is ensured to be less than phi 0.005 mm. The coaxiality is high, the processing precedent is not existed in our factory, and the technology is difficult to break through. In addition, due to the reasons of difficult chip removal, insufficient cooling and the like, most of machining tasks of inner holes are reserved for two procedures in the traditional process plan. The most suitable processing method is as follows: the first procedure is used for processing the minimum hole and the overall dimension, and the second procedure is used for clamping the excircle of the part by a numerically controlled lathe, processing two stepped holes and finally finishing the processing of the part. However, the traditional processing scheme is not suitable for processing the part, because the aperture processed by secondary clamping and processing is difficult to ensure high coaxiality with the excircle of the part processed by the first procedure.
All processes of machining parts from one end of the large hole are difficult to realize by using the existing cutter, the parts are made of stainless steel bars, and machining is difficult to a certain extent, so that the deep hole cannot ensure the roughness of more than 0.8 and the tolerance of 0.01 required by machining if a drill bit is used for machining only. Moreover, the deep hole is difficult to maintain the drill point at the central point position due to the swinging of the drill head, and once the deviation is generated, the center of the deep hole is deviated as the drill hole goes deeper. So only the combined drilling and boring mode can complete the machining. The diameter of the cutting part of the traditional boring tool can only be less than 2.4mm and 20mm long, so that the thin boring tool can generate a cutter back-off phenomenon due to insufficient rigidity. Resulting in the straight hole becoming slightly more planar. Therefore, a machining tool which can ensure that the machining minimum aperture size is qualified and the coaxiality meets the requirement is needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem to above-mentioned problem, provide one kind and can guarantee cascaded high accuracy minor diameter deep hole class casing minimum aperture
The machining depth is 18.6 +/-0.1 mm, and the machining depth meets the requirements of the small hole, two stepped holes and
the coaxiality between the outer circles ensures that the diameter is less than 0.005 mm.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a processing cutter of cascaded high accuracy minor diameter deep hole class casing, this processing cutter include coaxial setting and integrated into one piece's handle of a knife, cutter arbor and blade, the handle of a knife is the ladder cylinder size of compriseing first cylinder and second cylinder, and the cutter arbor is the cylinder size, and the front end of cutter arbor is the blade, and the junction of cutter arbor and blade is equipped with the transition inclined plane, the blade includes rake face, main cutting edge, minor cutting edge, the front edge of rake face is linear type main cutting edge, and the top of rake face is equipped with the convex linear type minor cutting edge to the outside, and the top of main cutting edge intersects with the front end of minor cutting edge, contained angle alpha between main cutting edge and the perpendicular is 5, the main declination beta of main cutting edge is 95, and anterior angle lambda and relief angle theta are 7, the minor declination delta of minor cutting edge is 2.
Further, the diameter D of the first cylinder1Is larger than the diameter D of the second cylinder2Diameter D of the second cylinder2Greater than the diameter D of the shank3。
Further, the diameter D of the first cylinder1Is 4mm, diameter D of the second cylinder23.75 +/-0.01 mm, diameter D of the cutter rod3Is 2.19 mm-2.20 mm.
Further, the axial length L of the first cylinder120mm +/-0.2 mm, axial length L of the second cylinder22.5 mm-2.7 mm, and the distance L between the end surface of the cutter rod and the vertical surface where the main cutting edge and the auxiliary cutting edge of the blade intersect38.5 mm-8.8 mm, the axial length L of the rake face43.0 to 3.3 mm.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the utility model discloses the handle of a knife of processing cutter is cascaded, has strengthened the rigidity of boring cutter in the at utmost when interfering when can effectively avoid the cutting. Meanwhile, the cutter adopts a form of a larger front angle, so that the cutting deformation and the cutting force are reduced, the stability of boring processing is further ensured, the boring processing can bear larger cutting torque, the bending and vibration phenomena are avoided, the processing of a high coaxial precision hole is ensured to be realized, and the technical requirement of high coaxial precision of a product is met. The utility model discloses a minimum aperture can be guaranteed to processing cutter
Drawings
Fig. 1 is a schematic structural diagram of a stepped high coaxial precision small diameter deep hole type shell processed by the embodiment of the invention;
FIG. 2 is a schematic view of the structure of the machining tool of the present invention;
fig. 3 is a schematic structural view of the rake and relief angles of the machining tool of the present invention;
fig. 4 is a schematic view of the use of the machining tool of the present invention;
FIG. 5 is a schematic view of a cylindrical bar machined by the machining tool of the present invention;
in the figure:
1-a housing body; 2-a first circular hole; 3-a second round hole; 4-a third circular hole; 5-front jacket; 6-rear jacket; 7-cylindrical bar stock; 8-machining a cutter; 81-a knife handle; 811-a first cylinder; 812-a second cylinder; 82-a cutter bar; 821-a transition bevel; 83-a blade; 831-rake face; 832-main cutting edge; 833 — secondary cutting edge;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Referring to fig. 1, the utility model discloses the structure of cascaded high coaxial precision minor diameter deep hole class casing of preprocessing is as shown in fig. 1, including casing body 1, at casing body 1 inside coaxial shoulder hole of constituteing by first round hole 2 and second round hole 3 that is equipped with in proper order to and third round hole 4, the aperture of first round hole 2 is
The aperture of the second circular hole 3 is
The third round hole 4 has a hole diameter of
Axial length L of housing body5Is 18.6 +/-0.1 mm.
The utility model provides a processing cutter of cascaded high accuracy minor diameter deep hole class casing, this processing cutter is including coaxial setting and integrated into one piece's handle of a knife 81, cutter arbor 82 and blade 83, handle of a knife 81 is the ladder cylinder size of compriseing first cylinder 811 and second cylinder 812, and cutter arbor 82 is the cylinder size, and the front end of cutter arbor 82 is blade 83, and the junction of cutter arbor 82 and blade 83 is equipped with transition inclined plane 821, blade 83 includes rake 831, main cutting edge 832, minor cutting edge 833, the leading edge of rake 831 is linear main cutting edge 832, and the top of rake 831 is equipped with outside convex linear minor cutting edge 833, and the top of main cutting edge 832 intersects with the front end of minor cutting edge 833, the contained angle alpha between main cutting edge 832 and the perpendicular is 5, the main declination angle beta of main cutting edge 832 is 95, and anterior angle theta are 7, the minor cutting edge 833 has a minor relief angle δ of 2 °.
Diameter D of the first cylinder 8111Is larger than the diameter D of the second cylinder 8122Diameter D of second cylinder 8122Larger than the diameter D of the shank 823。
Diameter D of the first cylinder 8111Is 4mm, and the diameter D of the second cylinder 81223.75 +/-0.01 mm, diameter D of the cutter rod3Is 2.19 mm-2.20 mm.
Axial length L of the first cylinder 811120mm + -0.2 mm, the axial length L of the second cylinder 81222.5 mm-2.7 mm, the distance L between the end surface of the tool holder 82 and the vertical plane where the main cutting edge 832 and the minor cutting edge 833 of the insert 83 intersect38.5 mm-8.8 mm, the axial length L of the rake face 83143.0 to 3.3 mm.
The stepped structure of the tool shank 81 of the machining tool is matched with the stepped inner cavity structure of the shell body 1. Along with the cutting depth, a single-side 0.2mm gap is formed between the cutter and the hole wall for chip removal (as shown in fig. 4), and the rest parts in the hole are filled with the cutter, so that the rigidity of the boring cutter is ensured to the maximum extent, and the problem of interference caused by over-thickness of the cutter handle 81 is avoided.
Referring to fig. 5, the utility model discloses a processing cutter carries out the processing method of cascaded high accuracy minor diameter deep hole class casing, and the method includes following step:
(1) fixing a cylindrical bar 7 to be processed in a front jacket 5 and a rear jacket 6 of a numerical control center-walking machine tool, controlling the front jacket 5 to keep axially fixed, enabling the cylindrical bar 7 to penetrate through the front jacket 5 and be attached to the inner wall of the front jacket 5, and enabling the rear jacket 6 to clamp the cylindrical bar 7 and drive the cylindrical bar 7 to axially move;
(2) firstly, a hard alloy twist drill with the diameter of 4.8mm is used for processing a first round hole 2, the rotation number of a machine tool is 2000 r/min, and the feeding speed is 0.01 mm/r;
(3) then, a hard alloy twist drill with the diameter of 4.8mm is used for processing a second round hole 3, the rotation number is 2000 r/min, the feeding speed is 0.02 mm/r, and the processing depth is 10.5 mm;
(4) continuously drilling a third round hole 4 at the bottom of the formed second round hole 3 by using a variable diameter hard alloy drill bit with the diameter of 2.4mm, wherein the rotation number is 1500 rpm, the feeding speed is 0.02 mm/rpm, and the processing depth is 19.5 mm;
(5) the whole stepped hole cavity is finely bored by using the processing cutter 8 (stepped alloy boring cutter) of the utility model, the processing cutter 8 is kept axially fixed at the nearest end of the front jacket, the rear jacket 6 drives the bar to move to one side of the processing cutter 8, the rotation number of the processing cutter 8 is 1500 rpm, and the feeding speed is 0.01 mm/rpm; the aperture of the first round hole 2 after processing is
The aperture of the second circular hole 3 is
The third round hole 4 has a diameter of phi
(6) The rear jacket 6 drives the bar to move rightwards, so that the tool retreats;
(7) adjusting the outer circular cutter to a machining cutter position, machining the appearance structure of the part, wherein the rotation speed is 2000 rpm, and the feeding speed is 0.02 mm/r;
(8) the auxiliary cutting of the excircle at the front end of the clamping part of the machine tool auxiliary shaft is avoided, and the part falls off and is damaged by collision with the machine tool after being cut offThen vertically feeding downwards to complete cutting, and cutting off the axial length L of the shell body518.6 +/-0.1 mm, and the auxiliary shaft returns with the parts and puts the parts in a collection box to finish the processing.
And (3) after the first round hole 2, the second round hole 3 and the third round hole 4 are roughly processed in the steps (2), (3) and (4), cutting amount of 0.1mm is reserved on one side.
And (5) boring the cutter tip of the machining cutter at a position of about 1mm from the front end of the front clamping sleeve 5.
The numerical control core-moving machine used in the embodiment adopts a numerical control longitudinal cutting machining center of Korea company, the model of which is XP 12.
The utility model discloses a theory of operation: the utility model discloses a rigidity of boring cutter has been strengthened to the at utmost when the processing cutter effectively avoids cutting the time interference. Meanwhile, the cutter adopts a form of a larger front angle, so that the cutting deformation and the cutting force are reduced, the stability of boring processing is further ensured, the boring processing can bear larger cutting torque, the bending and vibration phenomena are avoided, the processing of a high coaxial precision hole is ensured to be realized, and the technical requirement of high coaxial precision of a product is met.
The utility model discloses a design processing cutter, when having guaranteed high dimensional accuracy, more guaranteed the high axiality requirement. The utility model discloses minimum aperture can be guaranteed to the casing of processing
The machining depth is 18.6 +/-0.1 mm, and the machining depth meets the requirements of the small hole, two stepped holes and
the coaxiality between the outer circles is ensured to be less than phi 0.005 mm.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A stepped high-precision small-diameter deep hole shell processing cutter is characterized by comprising a cutter handle, a cutter bar and a blade which are coaxially arranged and integrally formed, the knife handle is a stepped cylinder consisting of a first cylinder and a second cylinder, the knife bar is a cylinder, the front end of the knife bar is a blade, a transition inclined plane is arranged at the joint of the knife bar and the blade, the blade comprises a front blade face, a main cutting edge and an auxiliary cutting edge, the front edge of the front blade face is a linear main cutting edge, a linear auxiliary cutting edge protruding outwards is arranged above the front blade face, the top end of the main cutting edge is intersected with the front end of the auxiliary cutting edge, the included angle alpha between the main cutting edge and the vertical plane is 5 degrees, the main deflection angle beta of the main cutting edge is 95 degrees, the front angle lambda and the back angle theta are both 7 degrees, and the auxiliary deflection angle delta of the auxiliary cutting edge is 2 degrees.
2. The stepped high-precision small-diameter deep-hole shell machining tool according to claim 1, wherein the diameter D of the first cylinder is1Is larger than the diameter D of the second cylinder2Diameter D of the second cylinder2Greater than the diameter D of the shank3。
3. The stepped high-precision small-diameter deep-hole shell machining tool according to claim 1, wherein the diameter D of the first cylinder is1Is 4mm, diameter D of the second cylinder23.75 +/-0.01 mm, diameter D of the cutter rod3Is 2.19 mm-2.20 mm.
4. The stepped high-precision small-diameter deep-hole shell machining tool according to claim 1, wherein the axial length L of the first cylinder is greater than the axial length L of the first cylinder120mm +/-0.2 mm, axial length L of the second cylinder22.5 mm-2.7 mm, and the distance L between the end surface of the cutter rod and the vertical surface where the main cutting edge and the auxiliary cutting edge of the blade intersect38.5 mm-8.8 mm, the axial length L of the rake face43.0 to 3.3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022998899.4U CN214185988U (en) | 2020-12-15 | 2020-12-15 | Processing cutter of cascaded high accuracy minor diameter deep hole class casing |
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|---|---|---|---|
| CN202022998899.4U CN214185988U (en) | 2020-12-15 | 2020-12-15 | Processing cutter of cascaded high accuracy minor diameter deep hole class casing |
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| CN214185988U true CN214185988U (en) | 2021-09-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112621128A (en) * | 2020-12-15 | 2021-04-09 | 沈阳兴华航空电器有限责任公司 | Method and tool for machining stepped high-precision small-diameter deep-hole shell |
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2020
- 2020-12-15 CN CN202022998899.4U patent/CN214185988U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112621128A (en) * | 2020-12-15 | 2021-04-09 | 沈阳兴华航空电器有限责任公司 | Method and tool for machining stepped high-precision small-diameter deep-hole shell |
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