阅读说明：本技术 一种加工汽车发动机缸体孔的复合式多刃pcd铰刀 (Combined type multi-blade PCD reamer for processing automobile engine cylinder hole ) 是由 咸志鹏 于 2021-07-15 设计创作，主要内容包括：本发明公开了一种加工汽车发动机缸体孔的复合式多刃PCD铰刀,其包括柄部和切削部,切削部自其前端向柄部依次设有一级切削部和二级切削部,一级切削部的外径小于二级切削部的外径,一级切削部和二级切削部均设有6个自其前端向柄部轴向延伸的排屑槽和PCD刀片,PCD刀片焊接在排屑槽朝向切削旋转方向的一侧,PCD刀片在排屑槽的外周形成周刃,PCD刀片在排屑槽的前端形成端刃,周刃自其刃口向后刀面一侧布置设置有圆弧刃带和后角,圆弧刃带的宽度为0.2mm～0.3mm,后角为16度～17度。采用本发明,能够实现一刀多用的加工效果,满足不同孔径的圆孔或阶梯孔加工要求,具有使用寿命高,加工质量好及效率高等优点。(The invention discloses a composite multi-blade PCD reamer for processing a cylinder hole of an automobile engine, which comprises a handle part and a cutting part, wherein the cutting part is sequentially provided with a primary cutting part and a secondary cutting part from the front end to the handle part, the outer diameter of the primary cutting part is smaller than that of the secondary cutting part, the primary cutting part and the secondary cutting part are respectively provided with 6 chip discharge grooves and PCD blades, the chip discharge grooves axially extend from the front end to the handle part, the PCD blades are welded on one sides of the chip discharge grooves towards the cutting rotation direction, the PCD blades form peripheral edges at the peripheries of the chip discharge grooves, the front ends of the chip discharge grooves of the PCD blades form end edges, the peripheral edges are provided with arc blade bands and relief angles from the cutting edges to one sides of rear cutter surfaces, the width of the arc blade bands is 0.2 mm-0.3 mm, and the relief angles are 16 degrees-17 degrees. The invention can realize the multi-purpose processing effect of one knife, meets the processing requirements of round holes or stepped holes with different apertures, and has the advantages of long service life, good processing quality, high efficiency and the like.)

1. The utility model provides a combined type multiple-blade PCD reamer in processing automobile engine cylinder hole which characterized in that, includes stalk portion and cutting portion, the cutting portion is equipped with one-level cutting portion and second grade cutting portion from its front end to the stalk portion in proper order, the external diameter of one-level cutting portion is less than the external diameter of second grade cutting portion, one-level cutting portion with second grade cutting portion all is equipped with 6 chip grooves and PCD blade from its front end to stalk portion axial extension, the PCD blade welding is in one side of chip groove towards the cutting direction of rotation, the PCD blade is in the periphery of chip groove forms the week sword, the PCD blade is in the front end of chip groove forms the end sword, the week sword is arranged from its blade to flank face one side and is provided with circular arc land and relief angle, the width of circular arc land is 0.2mm ~ 0.3mm, the relief angle is 16 degrees ~ 17 degrees.

2. The composite multi-blade PCD reamer for machining the hole of the cylinder block of the automobile engine as claimed in claim 1, wherein the peripheral edge of the primary cutting portion has chamfers at the front and rear sharp corners, respectively.

3. The composite multi-blade PCD reamer for machining the bore of the cylinder block of the automobile engine as claimed in claim 1, wherein the secondary cutting portion has a tungsten steel cutter body cutting portion at an end thereof remote from the primary cutting portion, and the outer circumference of the tungsten steel cutter body cutting portion is ground to be the same as the outer circumference of the secondary cutting portion.

4. The composite multi-blade PCD reamer for machining the hole of the cylinder block of the automobile engine as claimed in claim 1, wherein the flutes of the primary cutting portion are in axial straight line communication with the flutes of the secondary cutting portion.

5. The composite multi-blade PCD reamer for machining the hole of the cylinder block of the automobile engine as claimed in claim 1, wherein the plurality of chip flutes are distributed unequally in the circumferential direction of the cutting portion; the included angle of each group of two adjacent PCD blades is 62 degrees, 56 degrees, 66 degrees, 58 degrees, 60 degrees and 58 degrees along the circumferential direction of the cutting part in sequence.

6. The composite multi-blade PCD reamer for machining the cylinder hole of the automobile engine as claimed in claim 1, wherein the center of the height of the cutting edge of the peripheral blade is 0.1mm to 0.15 mm.

7. The composite multi-blade PCD reamer for machining the hole of the cylinder body of the automobile engine as claimed in claim 1, wherein the outer circle of the primary cutting portion and the outer circle of the secondary cutting portion are both provided with inverted cones.

8. The composite multi-edge PCD reamer for machining holes of cylinder blocks of automobiles according to claim 1, wherein the shank and the cutting part are of an integral structure, and the shank is a BT40 shank.

9. The composite multi-blade PCD reamer for machining the hole of the automobile engine cylinder according to any one of claims 1 to 8, wherein a cooling flow passage is further provided, the cooling flow passage includes a main flow passage and a plurality of branch flow passages, the main flow passage penetrates through the cutting portion and the shank portion, a coolant inlet is formed on the rear end surface of the shank portion, the branch flow passages penetrate through the cutting portion, one end of each branch flow passage is communicated with the main flow passage, the other end of each branch flow passage forms a coolant outlet in the chip groove, and the coolant outlet faces one side of the peripheral edge.

10. The composite multi-blade PCD reamer for machining the hole of the cylinder block of the automobile engine as claimed in claim 9, wherein the front end surface of the cutting portion is provided with a counter bore communicated with the main flow passage.

Technical Field

The invention belongs to the technical field of machining tools, and particularly relates to a combined type multi-blade PCD reamer for machining a cylinder hole of an automobile engine.

Background

In automobile engine production, the processing that has various holes on the engine cylinder body, the aperture differs, and the hole depth differs, if: a stepped bore. At present, the machining of a stepped hole is mainly carried out in a mode of combining an alloy drill bit and a reamer, firstly, the alloy drill bit is used for roughly machining a small-bore hole and a large-bore hole in sequence, and then the reamer is used for finely machining the small-bore hole and the large-bore hole in sequence.

Disclosure of Invention

The invention aims to provide a composite multi-blade PCD reamer which is used for machining a cylinder body hole of an automobile engine, can realize the multi-purpose machining effect of one cutter, meets the machining requirements of round holes or stepped holes with different apertures, and has the advantages of long service life, good machining quality, high efficiency and the like.

In order to achieve the above object, the present invention provides a composite multi-blade PCD reamer for machining a cylinder bore of an automobile engine, comprising a shank and a cutting portion, wherein the cutting portion is provided with a first-stage cutting portion and a second-stage cutting portion in sequence from a front end to the shank, an outer diameter of the first-stage cutting portion is smaller than an outer diameter of the second-stage cutting portion, the first-stage cutting portion and the second-stage cutting portion are respectively provided with 6 chip discharge grooves and PCD blades axially extending from the front end to the shank, the PCD blades are welded on one side of the chip discharge grooves facing a cutting rotation direction, the PCD blades form a peripheral edge on an outer periphery of the chip discharge grooves, the PCD blades form an end edge on the front end of the chip discharge grooves, the peripheral edge is provided with an arc land and a relief angle from a cutting edge to a flank side of the peripheral edge, a width of the arc land is 0.2mm to 0.3mm, and the relief angle is 16 degrees to 17 degrees.

In a preferred embodiment of the present invention, the peripheral edge of the primary cutting portion has a chamfer at each of a front end corner and a rear end corner.

In a preferred embodiment of the present invention, the secondary cutting portion has a tungsten steel blade cutting portion at an end thereof remote from the primary cutting portion, and the outer circumference of the tungsten steel blade cutting portion and the outer circumference of the secondary cutting portion are ground to have the same outer circumference.

In a preferred embodiment of the present invention, the flutes of the primary cutting portion and the flutes of the secondary cutting portion are linearly communicated in the axial direction.

As a preferable aspect of the present invention, the plurality of chip flutes are distributed unequally in the circumferential direction of the cutting portion; the included angle of each group of two adjacent PCD blades is 62 degrees, 56 degrees, 66 degrees, 58 degrees, 60 degrees and 58 degrees along the circumferential direction of the cutting part in sequence.

In a preferred embodiment of the present invention, the height center of the cutting edge of the peripheral edge is 0.1mm to 0.15 mm.

As a preferable scheme of the invention, reverse cones are left on the excircle of the primary cutting part and the excircle of the secondary cutting part.

In a preferred embodiment of the present invention, the shank and the cutting portion are of an integral structure, and the shank is a BT40 knife handle.

As a preferable mode of the present invention, the composite multi-blade PCD reamer for machining a cylinder bore of an automobile engine is further provided with a cooling flow channel, the cooling flow channel includes a main flow channel and a plurality of branch flow channels, the main flow channel penetrates through the cutting portion and the shank portion, a coolant inlet is formed in a rear end surface of the shank portion, the branch flow channels penetrate through the cutting portion, one end of each branch flow channel is communicated with the main flow channel, a coolant outlet is formed in the chip groove at the other end of each branch flow channel, and the coolant outlet faces one side of the peripheral edge.

As a preferable aspect of the present invention, a counter bore communicating with the primary flow passage is provided in a front end surface of the cutting portion.

Compared with the prior art, the composite multi-blade PCD reamer for processing the cylinder body hole of the automobile engine has the beneficial effects that:

(1) according to the invention, through the arrangement of the first-stage cutting part and the second-stage cutting part, a multi-purpose machining effect can be realized, the machining requirements of round holes or stepped holes with different apertures are met, a large amount of machining time and tool setting time are saved, the form and position tolerance precision between two stepped surfaces is greatly improved, the coaxiality of the machined stepped holes is effectively ensured, and the product quality is improved;

(2) according to the invention, the service life and the processing efficiency of the cutter are improved through the six-edge structure formed by the PCD blade;

(3) according to the invention, the arc-shaped cutting edge and the relief angle are sequentially arranged on one side of the rear cutter face from the peripheral cutting edge, and compared with the traditional relief angle plane, the design of the arc-shaped cutting edge can enhance the support property and firmness of the cutting edge, the service life of the cutter is prolonged, the processing precision is stable, and the surface quality of the processed product is good; and the back angle is designed to be 16-17 degrees, so that the sufficient rigidity of the peripheral blade can be ensured, meanwhile, a sufficient avoiding space is provided for the peripheral blade, the contact area between the back blade surface of the peripheral blade and the workpiece processing surface is reduced, and the cutting-in of the peripheral blade is facilitated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.

FIG. 1 is a front view of a composite multi-blade PCD reamer for machining a bore of a cylinder block of an automobile engine according to the present invention;

FIG. 2 is an enlarged view of a portion of the cutting portion of the structure shown in FIG. 1;

FIG. 3 is a transverse cross-sectional view of a primary cutting portion;

FIG. 4 is a transverse cross-sectional view of the secondary cutting portion;

fig. 5 is a transverse sectional view of the cutting portion of the tungsten steel cutter body.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the machine or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

As shown in fig. 1 to 5, a composite multi-blade PCD reamer for machining a cylinder bore of an automobile engine according to a preferred embodiment of the present invention includes a shank 1 and a cutting portion 2, the cutting portion 2 is provided with a primary cutting portion 2a and a secondary cutting portion 2b in sequence from a front end thereof to the shank 1, an outer diameter of the primary cutting portion 2a is smaller than an outer diameter of the secondary cutting portion 2b, each of the primary cutting portion 2a and the secondary cutting portion 2b is provided with 6 flutes 3 and PCD blades 4 axially extending from the front end thereof to the shank 1, the PCD blades 4 are welded to one side of the flutes 3 facing a cutting rotation direction, the PCD blades 4 form a peripheral edge 41 at an outer periphery of the flutes 3, the PCD blades 4 form a front end edge 42 at the flutes 3, the peripheral edge 41 is provided with an arc land 43 and a relief angle 44 from an edge thereof to a rear face side, the width of the arc blade zone 43 is 0.2 mm-0.3 mm, and the back angle 44 is 16 degrees-17 degrees.

Therefore, the embodiment of the invention can realize a multi-purpose machining effect by the arrangement of the first-stage cutting part 2a and the second-stage cutting part 2b, meet the machining requirements of round holes or stepped holes with different apertures, save a large amount of machining time and tool setting time, greatly improve the form and position tolerance precision between two stepped surfaces, effectively ensure the coaxiality of the machined stepped holes and improve the product quality; the service life and the processing efficiency of the cutter are improved through a six-edge structure formed by the PCD blade 4; by sequentially arranging the arc-shaped cutting edge 43 and the relief angle 44 on one side of the cutting edge of the peripheral edge 41 facing the flank face, compared with the traditional relief angle plane, the design of the arc-shaped cutting edge 43 can enhance the support and firmness of the cutting edge, prolong the service life of the cutter, ensure stable processing precision and ensure good surface quality of processed products; the relief angle 44 is designed to be 16 to 17 degrees, so that sufficient rigidity of the peripheral edge 41 can be ensured, a sufficient clearance space is provided for the peripheral edge 41, the contact area between the flank of the peripheral edge 41 and the workpiece machining surface is reduced, and the cutting of the peripheral edge 41 is facilitated.

Illustratively, the front end sharp corner and the rear end sharp corner of the peripheral edge 41 of the primary cutting portion 2a are respectively provided with chamfers 45 for overcoming the defects of too fast wear and short service life of a sharp-corner tool.

Illustratively, a chamfer 45 for overcoming the defects of too fast wear and short tool life of a sharp-angled tool is arranged at a sharp corner at the front end of the peripheral edge 41 of the secondary cutting part 2b, a tungsten steel cutter body cutting part 2c is arranged at one end of the secondary cutting part 2b far away from the primary cutting part 2a, and the outer periphery of the tungsten steel cutter body cutting part 2c and the outer periphery of the secondary cutting part 2b (i.e. the outer periphery of the PCD blade 4 at the position) are ground into equal outer circles.

Illustratively, to ensure that the flutes 3 are smooth and unobstructed, the flutes 3 of the primary cutting portion 2a and the flutes 3 of the secondary cutting portion 2b are in axial straight line communication.

Illustratively, in order to provide the tool with good shock resistance, the plurality of chip flutes 3 are distributed in unequal intervals in the circumferential direction of the cutting portion 2. In this embodiment, the included angle between each adjacent two PCD inserts 4 is 62 degrees, 56 degrees, 66 degrees, 58 degrees, 60 degrees, and 58 degrees in sequence along the circumferential direction of the cutting portion 2.

Illustratively, the high center of the cutting edge of the peripheral edge 41 is 0.1mm to 0.15mm (as indicated by the "h" mark in fig. 2). Such a design can enhance the support and firmness of the peripheral blade 41, and has a long service life, a stable processed aperture, and excellent surface roughness.

Illustratively, the outer circle of the primary cutting portion 2a and the outer circle of the secondary cutting portion 2b both have inverted cones with a large front end outer diameter and a small rear end outer diameter, so that friction between the peripheral edge 41 and the machining surface can be reduced, abnormal scraping between the peripheral edge 41 of the reamer and the machining surface when the center of the tailstock of the machine tool slightly deviates from the center is avoided, the roughness of the machining surface is increased, and the machining stability is maintained. In the embodiment, the taper of the inverted cone is 0.001-0.0013.

Illustratively, the handle part 1 and the cutting part 2 are of an integral structure, and the handle part 1 is preferably a BT40 knife handle.

Illustratively, the composite multi-blade PCD reamer is further provided with a cooling flow channel, the cooling flow channel comprises a main flow channel 51 and a plurality of branch flow channels 52, the main flow channel 51 penetrates through the cutting part 2 and the handle part 1, a coolant inlet is formed in the rear end surface of the handle part 1, the branch flow channels 52 penetrate through the cutting part 2, one end of each branch flow channel 52 is communicated with the main flow channel 51, the other end of each branch flow channel 52 forms a coolant outlet in the chip discharge groove 3, and the coolant outlet faces one side of the peripheral blade 41. From this, every week sword 41 all can have special cooling channel to cool off, guarantees that the cutter has good cooling effect when adding man-hour, effectively erodees simultaneously and remains the smear metal, makes the chip removal more smooth and easy, increases cutter wearability, improves surface finish quality.

Illustratively, the front end face of the cutting part 2 is provided with a counter bore 53 communicated with the main flow passage 51, and the counter bore 53 is internally provided with a plug for blocking the coolant in the main flow passage 51 from flowing out of the counter bore 53. When necessary, can open the jam, make the coolant flow out from the front end of cascaded cutting portion 2, effectively erode the milling cutter front end and remain the smear metal, prevent that the smear metal from piling up in the milling cutter front end, make things convenient for the smear metal to discharge.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.