CN220278297U - Slender shaft type deep hole boring pushing tool - Google Patents

Abstract

The slender shaft type deep hole boring pushing tool disclosed by the utility model has excellent cooling and lubricating effects and high processing quality and processing efficiency. The technical scheme is as follows: the front end of the cutter bar is in threaded connection with the cutter head, the center of the cutter bar is provided with an axial cooling hole communicated with the chip groove blade shaft cooling hole, the tail of the cutter bar section is provided with a cutter tooth buckle connected with a cooling hose and a cooling blind hole axially penetrating into the cutter head, and the axial cooling blind hole in the cutter bar is communicated with at least 4 chip groove blade shaft cooling holes in the cutter head; according to the diameter size of the shaft type slender deep hole processing part, the direction of the generatrix of the blade shaft is provided with a blade rotation angle which is less than or equal to 30 degrees, the spiral tooth number Z of the end blade is more than or equal to 4, the blade shaft of the chip groove is uniformly distributed and is inclined at the bottom of the chip groove by more than or equal to 20 degrees, the front angle of the edge blade tip which is less than or equal to 10 degrees is arranged along the axial direction, the axial center of the blade shaft is less than or equal to 6 degrees of the tip angle of the axial blade core, the back rotation angle of the edge blade tip which is less than or equal to 14 degrees is less than or equal to 2 degrees, and the angle of the edge blade tip is less than or equal to 2 degrees, so that the deep hole push boring cutter is manufactured.

Description

Slender shaft type deep hole boring pushing tool

Technical Field

The utility model relates to a method for performing deep hole reaming on shaft parts by using a common lathe and a special boring cutter head and a cutter bar, in particular to parts with large length-diameter ratio (L/D is more than 16).

Background

A shaft with a length to diameter ratio greater than 20-25 (i.e., L/d. Gtoreq.20-25) is referred to as an elongated shaft. Such parts are typically machined on a lathe. In the turning process, due to the fact that rigidity is poor, under the action of cutting force and cutting heat, the slender shaft is easy to bend and deform, and accuracy of relative movement of a cutter and a part is damaged, the machined slender shaft is thick in the middle and thin at two ends, machining precision of the part is seriously affected, and meanwhile, after the slender shaft is bent and deformed, a process system is vibrated, and roughness of the part is affected. Under the action of cutting force and gravity, the transverse slender shaft is easy to bend and even unstably. The rigidity of the slender shaft is poor, the clamping is improper during turning, bending deformation is easy to occur due to the action of cutting force and gravity, vibration is generated, and therefore machining precision and surface roughness are affected. The elongate shaft has poor thermal diffusivity and can produce considerable linear expansion under the action of cutting heat. If the two ends of the shaft are fixedly supported, the workpiece may buckle due to elongation. Because the shaft is longer, the one-time feeding time is long, and the cutter abrasion is large, thereby affecting the geometric shape precision of the part. When the slender shaft is turned, the follower rest is used, and if the two supporting blocks for supporting the workpiece are not suitable for the pressure of the workpiece, the machining precision can be affected. If the pressure is too low or not in contact, it will not work and the rigidity of the part will not be improved: if the pressure is too large, the part is pressed to the turning tool, the cutting depth is increased, the diameter of the turning tool is small, after the follower rest continues to move, the supporting block is supported at the excircle with small diameter, the supporting block is separated from the workpiece, the cutting force enables the workpiece to outwards open, the cutting depth is reduced, the diameter of the turning tool is increased, the follower rest is pressed to the turning tool again after the follower rest is moved to the circle with large diameter, the diameter of the turning tool is reduced, and therefore, the slender workpiece is turned into a bamboo joint shape after continuous regular change. The poor rigidity of the machine tool, workpiece and cutter process system brings difficulty to cutting machining, and good surface roughness and geometric accuracy are not easy to obtain. Deep holes with large diameters are drilled on lathes, and most of such workpieces are hollow rods, hollow slender shafts, machine tool spindles and the like. The risk of using twist drills to drill these holes is that the drill is susceptible to grinding, breaking, withdrawal of the tool from the hole and difficult to remove. And the chip removal is difficult and the chip removal is carried out for many times, so that the cooling and lubrication are not easy. Because the diameter of the drill bit is large and the axial cutting force is large, the automatic feeding by a large carriage of a lathe is not facilitated. Therefore, it is generally prohibitive for a person not grasping the operating technique.

Deep holes are holes having an aspect ratio of greater than 5. In actual practice, ultra-deep holes with aspect ratios greater than 100 are often encountered. The machining method generally belongs to the category of ultra-deep hole machining according to the size requirement of workpiece machining, has higher machining and manufacturing difficulty, and has higher machining difficulty even if the machining is performed by using outer chip removal deep drilling on a special deep drilling machine. Therefore, the machining on the common lathe has certain difficulty, and the main aspects are the following aspects of workpiece positioning, proper long rod cutting drilling tool selection, chip removal and cooling treatment according to the manufacturing requirements of the common lathe and drilling cutting process. The machining and manufacturing of the parts with the elongated holes are parts with higher production and machining difficulty in the existing mechanical equipment, and the machining of the elongated holes of the shaft parts has higher difficulty in machining. In the aerospace hydraulic product, more piston rod parts have the structural characteristics of deep holes, and special equipment is often required to be used when the parts are processed in batches. The size requirements for manufacturing such elongated hole members are relatively stringent. The production worker is to finish the operation by means of the connecting equipment, so that the production worker is a relatively complex manufacturing link, and has certain production and manufacturing difficulty in processing the elongated holes for common machine tool facilities, and needs to use common machine tool drilling equipment, control the cutting process and operate according to the production process requirements strictly. Some factories lack specialized mechanical equipment to assist machining, however, conventional machine tool machining elongated hole techniques require continual improvement. How to process the deep holes of the shaft parts by means of an ordinary lathe improves the production and manufacturing efficiency, and has positive significance for solving the actual production and processing bottleneck.

The surface quality of the inner hole of the shaft part stressed in certain products has a certain influence on the fatigue strength of the part. The surface quality of the inner hole of the part with the long and thin hole structure is not satisfactory for the part with the long and thin hole structure, and even if the shock absorption cutter rod is used for fine boring, the problem cannot be solved. Affecting its fatigue strength properties.

The ratio of the depth to the diameter of the hole in the hole machining determines the rigidity of the hole machining process and the characteristics of the cutter structure, the rigidity of a process system with large diameter ratio L/D is reduced, and the difficulty of chip removal and cooling is increased. Since the cutting condition of the cutter cannot be directly observed in the machining of the slender hole, the normal cutting process can be judged only through experience and cutting sound when the common lathe is used for machining the slender hole. In addition, the cutting heat in the machining is not easy to transfer, 80% of the cutting heat is taken away by the cutting chips in the general cutting process, the slender hole is machined only by 40%, the proportion of the cutting tool to the cutting heat is large, the diffusion is slow, the cutting edge cutting chip temperature is overheated, and an effective cooling mode is needed. However, it is difficult to deliver the cooling liquid to the depth of the elongated holes for cooling in a general cooling manner. Because the cutting heat is not easy to be transmitted during the processing of the slender hole, the temperature of the cutting edge is increased, so that the abrasion of the cutter is accelerated, the processing efficiency and the processing quality are reduced. Because of the slender structure of the machining hole, the chip removing route is long, the chip is not easy to remove, and the blockage and the tool tipping are easy to occur, so that the length and the shape of the chip need to be controlled. The rigidity of the process system is poor, and the cutter bar is thin and long in structure and poor in rigidity due to the limitation of the aperture size, so that vibration is easy to generate when a hole is machined, and the drilling is deviated. The manufacturing position of the deep hole is deviated, and the reason for the movement is often the problems of the axial acting force and the rigidity of the drilling tool. During the production and manufacture of the slender hole, engineering personnel also adopt a deep cutting technology, but the deep cutting technology is used for rapidly cooling, so that a series of reactions and accidents caused by high-temperature to low-temperature parts are avoided. After the drilling is completed, the chips in the drilling are quickly cleaned, and the chips are discharged timely, so that the problem of blocking the drilling can be avoided, the whole processing and manufacturing process is smoother, and the production, processing and manufacturing efficiency is improved. In the production and manufacture of elongated hole parts, the problems of cooling and chip removal need to be reasonably handled with priority, otherwise the sequence of the whole operation process and the fluency of the operation links can be influenced.

At present, long and thin holes are machined by common lathe equipment, and a lathe is not provided with high-pressure equipment, so that cooling liquid is difficult to convey to the deep part of the long and thin holes for cooling. In machining, there is a great difficulty in machining slender shaft parts with high quality, mainly because the workpiece is slender and has poor rigidity; when turning is performed, twist, prismatic or bamboo joint shapes can appear; it is difficult to fundamentally ensure ovality, taper, etc. of the workpiece. In the aspect of machining the elongated holes of the common lathe, the cut parts need to be cooled timely and chips are discharged timely, so that the machining process can be guaranteed to be carried out, and otherwise, blockage is generated. Under the current conventional cooling mode, the cutting fluid is prohibited from entering the cutting area, and has a certain restriction on the chip removal effect and the cooling effect, so that the application range is limited. From the size requirement of the workpiece, L/D is approximately equal to 70, the machining difficulty is self-evident, and the machining difficulty is very high even if the outer chip removal deep hole drill is used for machining on a special deep hole drill machine. The following difficulties are mainly present when working on a common lathe:

(1) Accurate positioning of workpieces

The clamping and positioning of the workpiece directly relate to the drilling machining precision. The reason that deep hole processing is easy to drill off-set is that apart from the rigidity of drilling tools and the magnitude of processing axial acting force, the clamping and positioning of workpieces are also one of main influencing factors. Therefore, a special fixture is designed according to the size requirement of the workpiece and combined with specific processing equipment and a process method so as to solve the clamping and positioning of the workpiece;

(2) The method is suitable for drilling the ultra-deep hole of the long rod cutting drilling tool of the common lathe, and the applicable long rod drilling tool is necessary. The long rod drilling tool which is suitable for being designed according to the very processing size requirement in the market is difficult to buy and suitable for ultra-deep hole drilling tools;

(3) Cooling and chip removal problems during machining

Boring tools for machining centers are not substantially different from cylindrical turning tools in terms of the cutting portions thereof, but boring is generally performed in a machining center using cantilever type machining, and thus, various cutting conditions are required for boring tools, and various types of boring tools are required. The number of cutting edges of boring tools can be divided into single-blade boring tools and double-blade boring tools. The shank and the cutting part of the boring cutter are integrated, and the cutting part is mainly made of cemented carbide. The boring machine has only one cutting edge, has compact and simple structure, small volume and easy manufacture, and can bore various small holes, non-through holes and stepped holes. If the boring tool is arranged on a universal tool rest or a flat rotary disk sliding seat, holes, end faces and the like with larger diameters can be bored. However, the single-edge boring cutter has poor rigidity and is easy to vibrate during cutting. The size of the boring aperture is ensured by adjusting the overhanging length of the cutter, and the boring aperture is troublesome to adjust and has low efficiency. Deep hole machining means that the ratio of the hole depth to the hole light of a workpiece to be machined is between 5 and 30, and the hole depth brings the difficulties of chip removal, cooling lubrication and difficulty in observing the quality of the surface to be machined: moreover, the cutter is easy to wear: the machined surface is easily scratched by chips, the surface quality is difficult to ensure, the center hole deflection of the thin-wall deep-hole cylindrical part is easy to occur, and the straight line of the hole shape or deformation cannot be ensured. In the drilling process of the ultra-deep hole, the effective cooling of the cutting part and the continuous discharge of the cutting chips are ensured, which is the key for continuously carrying out the processing process and the key for preventing the clamping drill and ensuring the service life of the drilling tool. The conventional cooling method is not applicable because the cooling effect and the chip removal effect of the cutting fluid which cannot be directly injected into the cutting area in the ultra-deep hole machining process are not guaranteed. In summary, the machining of ultra-deep elongated holes has been a challenge in machining.

Disclosure of Invention

Aiming at solving the problems in the prior art, the utility model aims to provide a cutter for finishing an elongated hole, which has excellent cooling and lubricating effects, high machining precision, high quality and high machining efficiency and solves the guiding problem of elongated hole machining.

The technical scheme adopted for solving the technical problems is as follows: an elongated shaft type deep hole pushing boring cutter, comprising: cutter arbor and set up in cutter head on the cutter arbor, its characterized in that: the front end of the cutter bar is connected with the cutter head through threads, the end of the cutter bar is provided with a central hole, the center of the cutter bar is provided with an axial cooling hole communicated with the chip groove blade shaft cooling hole, the tail of the cutter bar is provided with a cutter tooth buckle connected with a cooling hose and a cooling blind hole axially penetrating into the cutter head, and the axial cooling blind hole in the cutter bar is communicated with at least 4 chip groove blade shaft cooling holes in the cutter head; according to the diameter size of the shaft type slender deep hole processing part, the direction of the generatrix of the blade shaft is provided with a blade rotation angle which is less than or equal to 30 degrees, the spiral tooth number Z of the end blade is more than or equal to 4, the blade shaft of the chip groove is uniformly distributed and is inclined at the bottom of the chip groove by more than or equal to 20 degrees, the front angle of the edge blade tip which is less than or equal to 10 degrees is arranged along the axial direction, the axial center of the blade shaft is less than or equal to 6 degrees of the tip angle of the axial blade core, the back rotation angle of the edge blade tip which is less than or equal to 14 degrees is less than or equal to 2 degrees, and the angle of the edge blade tip is less than or equal to 2 degrees, so that the deep hole push boring cutter is manufactured.

The cutter handle part is connected with the cutter bar in a rectangular mode, the diameter dimension phi of the cutter part is larger than or equal to 34mm, the length of the cutter shaft is larger than or equal to 65 mm, the machining aperture phi of the cutter head is larger than or equal to 34mm, and the machining depth is larger than 500mm.

Compared with other hole processing technologies at the present stage, the utility model has the following beneficial effects:

in order to solve the cooling problem during processing, the phi 7 cooling hole is formed in the cutter bar, the phi 7 cooling hole formed in the cutter head handle is connected with the cutter bar, the 4-phi 2.5 holes formed in the cutter head edge are communicated with the phi 7 cooling hole formed in the handle, and cooling liquid directly enters a cooling area for cooling through the cooling holes of the cutter handle and the cutter head during processing, so that the effects of cooling and lubrication are achieved. The cutter bar is connected with the lathe tailstock in a stepped shaft mode, the connecting part is a cylindrical milling flat surface, and the working length of the flat milling flat surface is more than or equal to 25 times of the diameter of the cutter head; and the influence factors of easy deflection of deep hole processing are avoided. According to the size requirement of the workpiece, the special processing equipment is combined, the workpiece is fixed on the lathe saddle through the cutter bar, and the special fixture is not required to be designed in the process method for pushing and boring the boring scraps by dragging the lathe saddle, so that the defects that the clamping and positioning of the workpiece and the bending deformation of the slender shaft are easy to generate, the vibration instability of a process system is caused by the bending deformation, and the roughness of parts is influenced are overcome. The cylindricity of the workpiece is fundamentally ensured. The lathe chuck and the center frame for the shaft type slender deep hole machining part are arranged on the lathe guide rail, so that the defect of poor rigidity of the slender shaft is overcome.

The utility model is closely related to the three aspects of chip separation, chip winding and chip breaking in the cutting process, adopts the measures of chip separation and chip breaking of the tooth boring cutter with the guide chip removal blade group to reduce the chip capacity coefficient (the ratio of the cutting volume to the volume of the cut metal), and the axial cooling hole communicated with the chip groove blade shaft cooling hole is formed in the center of the cutter handle, thereby ensuring the effective cooling of the cutting part and the continuous discharge of the chip, stabilizing the cutting process, and avoiding the defects that the chip beginning suddenly changes and the irregular state occur and the cooling effect and the chip removal effect of the cutting fluid cannot be directly injected into the cutting area in the ultra-deep hole machining process by the conventional cooling method are not guaranteed. The boring cutter with the guide chip removal blade group teeth and the cutter bar, which are manufactured by the sharp angle of the blade core with the axial center less than or equal to 6 degrees, and the number Z of the spiral teeth of the end blade more than or equal to 4, adopt an ordinary lathe to carry out semi-finishing processing on the slender holes, thereby improving the processing quality and the processing efficiency of the slender holes.

The utility model aims at the problems that the length-diameter ratio of an elongated hole is large, the cutter bar is thin and long, the rigidity is low, vibration is easy to generate, and the machined hole is inclined to influence the machining precision and the production efficiency, and when in reaming, the cutter with 4 blades is manufactured by taking an original hole as a guide and by guiding the number of cutter heads of the tooth boring cutters with chip removing blades, and the guiding problem of machining the elongated hole is well solved by reasonably guiding the stepped shaft cutter bar with certain rigidity and certain correction function during machining and pushing. Compared with single drilling, the existing defects on the hole such as roundness and straightness errors can be corrected by using the cutter for push boring after drilling, so that good geometric accuracy and surface roughness are obtained, and in general, the hole accuracy after push boring cutting can reach IT10-IT11, and the surface roughness Ra can reach 1.6-3.2.

Drawings

FIG. 1 is a schematic view of an elongated shaft type deep hole boring cutter of the present utility model;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a cross-sectional view A-A of FIG. 1;

FIG. 4 is a schematic illustration of a push boring bar;

FIG. 5 is a schematic diagram of a deep hole part to be machined of a shaft part with a large length-to-diameter ratio (L/D > 16).

Detailed Description

See fig. 1-5. In a preferred embodiment described below, an elongate shaft-like deep hole boring cutter comprises: the cutter bar and the cutter head arranged on the cutter bar. The cutter handle part at the front end of the cutter rod is in threaded connection with the cutter head in a cuboid mode, a central hole is formed in the end of the cutter rod, an axial cooling hole communicated with the chip groove blade shaft cooling hole is formed in the center of the cutter handle, a cutter tooth buckle connected with a cooling hose and a cooling blind hole axially penetrating into the cutter head are formed in the tail of the cutter rod, and at least 4 chip groove blade shaft cooling holes in the cutter head are communicated with the axial cooling blind hole in the cutter rod; according to the diameter size of the shaft type slender deep hole processing part, the direction of the generatrix of the blade shaft is provided with a blade rotation angle which is less than or equal to 30 degrees, the spiral tooth number Z of the end blade is more than or equal to 4, the blade shaft of the chip groove is uniformly distributed and is inclined at the bottom of the chip groove by more than or equal to 20 degrees, the front angle of the edge blade tip which is less than or equal to 10 degrees is arranged along the axial direction, the axial center of the blade shaft is less than or equal to 6 degrees of the tip angle of the axial blade core, the back rotation angle of the edge blade tip which is less than or equal to 14 degrees is less than or equal to 2 degrees, and the angle of the edge blade tip is less than or equal to 2 degrees, so that the deep hole push boring cutter is manufactured.

In the design of the cutter head, the design of the cutter bar, the cooling mode and the reasonably-guided chip removal mode, the cutter head is designed: the cutter head material adopts superhard high-speed steel with high hardness, high wear resistance and high-temperature hardness, and adopts 1220-1250 ℃ quenching and 550-600 ℃ tempering heat treatment to lead the superhard high-speed steel to reach 66-69 Rockwell hardness, according to the diameter size of an axial slender deep hole processing part, the front angle of an edge cutting tip is less than or equal to 10 degrees, the back rotation angle of the edge cutting tip is less than or equal to 14 degrees, the edge rotation angle of the edge shaft in the direction of a bus is less than or equal to 30 degrees, the bottom of a chip groove is more than or equal to 20 degrees, the angle of the edge cutting tip at the edge end is less than or equal to 2 degrees, the sharp angle of the edge core at the axial center is less than or equal to 6 degrees, and the leading chip removing edge group tooth boring cutter with the end edge spiral tooth number Z is more than or equal to 4 is manufactured;

the design of the cutter bar: the cutter bar is made of high-strength quenched and tempered steel with the hardness more than HRC35-40, the diameter of the cutter bar is reduced by 4-6mm for the diameter of the cutting end, the cutter bar is coaxially and transitionally crosslinked with a chip groove cutting edge shaft, the cutter bar part at the front end of the cutter bar is in threaded connection with the cutter head in a cuboid mode, a central hole is formed in the end of the cutter bar, an axial cooling hole communicated with a chip groove cutting edge shaft cooling hole is formed in the center of the cutter bar, the cutter bar is connected with a lathe tailstock in a stepped shaft mode, the connecting part is in cylindrical milling with a flat surface, and the working length of a flat milling plane is more than or equal to 25 times the diameter of the cutter head;

the cooling mode is as follows: the axial cooling holes in the cutter bar are communicated with at least 4 chip groove edge shaft cooling holes in the cutter head, when the slender hole is machined, the lathe chuck and the center frame for the slender deep hole machining parts of the shaft are arranged on the lathe guide rail, the cooling hose is connected with the cutter head buckle of the tail axial cooling holes of the cutter bar section, cooling liquid directly enters the boring cooling area for cooling through the axial cooling holes in the center of the shaft control cutter handle and the chip groove edge shaft cooling holes of the cutter head, the cutter bar is fixed on the lathe cutter holder, boring chips are pushed and bored by dragging of the lathe cutter holder and the follower holder, and the chip dividing, the chip winding and the chip breaking of the boring chips are timely discharged through the edge shaft chip grooves.

The cutter head is used for machining slender holes with the aperture phi more than or equal to 34 and mm, the machining depth more than 500 and the length-diameter ratio L/D more than 10. The diameter dimension phi of the blade part is more than or equal to 34 and mm, and the length of the blade shaft is more than or equal to 65 and mm.

The cutter head is used for processing slender holes with the diameter phi more than or equal to 34+0.15 holes, the processing depth more than 500mm and the L/D more than 10. The technical parameters are as follows: the diameter dimension phi of the cutting part is more than or equal to 34.050-0.01, the coaxiality of the cutting part to the handle part is less than or equal to 0.01, the radial cutting edge angle of the cutting part is less than or equal to 2 degrees, the runout of the cutting part to the handle part is less than or equal to 0.01, the number Z of cutting edges is less than or equal to 4, the cutting angle of the cutting edges is less than or equal to 10 degrees, the cooling Kong 2.5.5 mm of the cutting edge shaft of the chip groove is carried out on at least 4 positions of the cutting edge shaft of the chip groove, the cylindrical diameter phi of the connecting part of the cutting edge shaft and the handle part of the cutter head is more than or equal to 30 mm, the length is more than or equal to 20 mm, the cylindrical milling thickness of the connecting part is more than or equal to 27 mm, the length is more than or equal to 18 mm of the flat surface, the cutter handle part is connected with the cutter bar by 20X 12/2 of rectangle, and the outer circle of the cutter handle part is positioned by the diameter phi is more than or equal to 20.5, the outer circle of the roughness Ra0.8 and phi 17-0.01-0.02.

The axial blade angle of the blade part is less than or equal to 6 DEG roughness Ra0.4, the cooling Kong 2.5.5 mm of the blade part 4 of the cutter head, the blade part length of the cutter head is more than or equal to 65 mm, the blade rotation angle is less than or equal to 30 DEG, the cylindrical diameter phi of the connecting part of the blade part and the handle part of the cutter head is more than or equal to 30 mm, the length is more than or equal to 20 mm, the cylindrical milling thickness of the connecting part is more than or equal to 27 mm, the length is more than or equal to 18 mm of flat surfaces, the handle part is connected with the cutter bar in a rectangular mode, the tooth top diameter phi is more than or equal to 20 mm-0.05-0.1 roughness Ra1.6, the tooth bottom diameter phi is more than or equal to 17.5-0.05-0.15, the spacing is more than or equal to 3.2 mm, and the tooth pitch is less than or equal to 6mm.

The design of the cutter bar: the cutter bar is made of 30CrMnSiA and has the hardness HRC35-40, the cutter bar is matched with the cutter head to be used, the diameter phi of the working part of the cutter bar is more than or equal to 300 mm, the length is more than or equal to 555 mm, the diameter phi of the connecting part is more than or equal to 25 mm, the length is more than or equal to 80 mm, the aperture sizes of the positioning inner diameters of the connecting cutter bars are respectively more than or equal to phi 20.5 mm, the length is more than or equal to 16 mm, the diameter phi is more than or equal to 17 mm, the length is more than or equal to 11 mm, the diameter phi of the axial cooling hole of the center of the cutter bar is more than or equal to 7 mm,

the cutter handle is connected with the chip groove blade shaft cutter head through a rectangle 20 multiplied by 12/2, the size of the rectangle 20 multiplied by 12/2 mm is that the tooth top diameter phi is more than or equal to 20 mm, the tooth bottom diameter phi is more than or equal to 17.5 mm, the spacing is more than or equal to 3.2 mm, and the tooth pitch is more than or equal to 6mm.

The cutter bar is matched with a cutter head for use, the diameter phi of the working part of the cutter bar is more than or equal to 300 mm-0.05, the length is more than or equal to 555 mm, the diameter phi of the connecting part is more than or equal to 25-0.01-0.02, the length is more than or equal to 80, the aperture size of the positioning inner diameter of the connecting cutter bar is more than or equal to 20. mm +0.027, the roughness Ra1.6, the length is more than or equal to 16 mm, the diameter phi is more than or equal to mm +0.027, the roughness Ra1.6, the length is 11 mm, the diameter phi is more than or equal to 7 mm cooling holes are formed in the center of the cutter bar, the cutter bar is connected with the cutter head through a rectangle 20 multiplied by 12/2 mm, the size of the rectangle 20 multiplied by 12/2 mm is more than or equal to 20 mm-0.05-0.1 roughness Ra1.6, the tooth bottom diameter phi is more than or equal to 17.5 mm-0.05-0.15, the pitch is more than or equal to 3.2 mm, and the tooth pitch is more than or equal to 6mm. The diameter of the cutter bar is adjusted in the range of phi 4-phi 7 mm according to the diameter of the internal cooling hole, and the dimensions are calculated in millimeter mm.

The foregoing description is only of the preferred embodiments of the present utility model, but the present utility model is not limited to the above-described embodiments, and various modifications and changes can be made by those skilled in the art, and any modifications, equivalents, and improvements made by using the present utility model are intended to be included in the scope of the present utility model.

Claims (8)

1. An elongated shaft type deep hole pushing boring cutter, comprising: cutter arbor and set up in cutter head on the cutter arbor, its characterized in that: the cutter shank at the front end of the cutter shank is in threaded connection with the cutter head, a central hole is formed in the end of the cutter shank, an axial cooling hole communicated with the chip groove blade shaft cooling hole is formed in the center of the cutter shank, a cutter tooth buckle connected with a cooling hose and a cooling blind hole axially penetrating into the cutter head are formed in the tail of the cutter shank, and the axial cooling blind hole in the cutter shank is communicated with at least 4 chip groove blade shaft cooling holes in the cutter head; according to the diameter size of the shaft type slender deep hole processing part, the direction of the generatrix of the blade shaft is provided with a blade rotation angle which is less than or equal to 30 degrees, the spiral tooth number Z of the end blade is more than or equal to 4, the blade shaft of the chip groove is uniformly distributed and is inclined at the bottom of the chip groove by more than or equal to 20 degrees, the front angle of the edge blade tip which is less than or equal to 10 degrees is arranged along the axial direction, the axial center of the blade shaft is less than or equal to 6 degrees of the tip angle of the axial blade core, the back rotation angle of the edge blade tip which is less than or equal to 14 degrees is less than or equal to 2 degrees, and the angle of the edge blade tip is less than or equal to 2 degrees, so that the deep hole push boring cutter is manufactured.

2. The elongate shaft deep hole boring cutter as claimed in claim 1, wherein: the cutter handle part is connected with the cutter bar, the diameter dimension phi of the cutter part is more than or equal to 34mm, the length of the cutter shaft is more than or equal to 65 mm, the machining aperture phi of the cutter head is more than or equal to 34mm, and the machining depth is more than 500mm.

3. The elongate shaft deep hole boring cutter as claimed in claim 2, wherein: the diameter of the axial cooling blind hole in the center of the cutter handle is larger than or equal to 7 mm, the diameter of the tooth top is larger than or equal to 20 mm, the diameter of the tooth bottom is larger than or equal to 17.5 mm, the distance is larger than or equal to 3.2 mm, and the tooth pitch is larger than or equal to 6mm.

4. The elongate shaft deep hole boring cutter as claimed in claim 1, wherein: the chip groove blade shaft is cooled Kong 2.5.5 mm, the diameter phi of a cylinder of the connection part of the chip groove blade shaft and the cutter head handle part is more than or equal to 30 mm, the length is more than or equal to 20 mm, the thickness of a cylinder mill of the connection part is more than or equal to 27 mm, and the length is more than or equal to 18 mm flat surfaces.

5. The elongate shaft deep hole boring cutter as claimed in claim 1, wherein: the axial cooling holes in the cutter bar are communicated with at least 4 chip groove blade shaft cooling holes in the cutter head, the cooling hose is connected with a cutter button of the tail axial cooling hole of the cutter bar section, and cooling liquid directly enters a boring cooling area for cooling through the axial cooling holes in the center of the shaft control cutter handle and the chip groove blade shaft cooling holes of the cutter head, and the chip separation, the chip rolling and the chip breaking of boring chips are timely discharged through the blade shaft chip grooves.

6. The slender shaft type deep hole pushing boring cutter as claimed in claim 5, wherein: the cutter bar is made of high-strength quenched and tempered steel with the hardness more than HRC35-40, the diameter of the cutter bar is reduced by 4-6mm for the diameter of the cutter edge end, the cutter bar is coaxially connected with a cutter shaft of a lathe tailstock in a stepped shaft mode, the connecting part is used for milling a flat surface, and the working length of the flat milling plane is more than or equal to 25 times of the diameter of the cutter head.

7. The slender shaft type deep hole pushing boring cutter as set forth in claim 6, wherein: the cutter bar is made of 30CrMnSiA and has the hardness HRC of 35-40, the cutter bar is matched with the cutter head to be used, the diameter phi of the working part of the cutter bar is more than or equal to 300 mm, the length is more than or equal to 555 mm, the diameter phi of the connecting part is more than or equal to 25 mm, the length is more than or equal to 80 mm, the aperture size of the positioning inner diameter of the connecting cutter bar is more than or equal to 20.5 mm, the length is more than or equal to 16 mm, the diameter phi is more than or equal to 17 mm, and the length is more than or equal to 11 mm.

8. The elongate shaft deep hole boring cutter as claimed in claim 1, wherein: the diameter of the cutter bar is adjusted within the range of phi 4-phi 7 mm according to the diameter of the internal cooling hole.