CN217551252U

CN217551252U - A powerful drill bit for quench steel processing

Info

Publication number: CN217551252U
Application number: CN202221330140.1U
Authority: CN
Inventors: 史晓亮; 刘欣; 李鹏
Original assignee: Shaanxi Fast Gear Co Ltd
Current assignee: Shaanxi Fast Gear Co Ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-10-11
Anticipated expiration: 2032-05-30

Abstract

The utility model discloses a powerful drill bit for quench steel processing can reduce the process, promotes the aperture precision simultaneously, prolongs the cutter life, reduces the processing cost by a wide margin. Comprises a tool nose, a drill bit body and a tool handle which are connected in sequence; the drill bit comprises a drill bit body, wherein the core thickness of the drill bit body is not less than 30% of the outer diameter of the drill bit body, spiral channels spirally rising along the outer peripheral wall of the drill bit body are formed in the drill bit body, spiral grooves are formed among the spiral channels, one ends of the spiral grooves extend to the tool nose, the other ends of the spiral grooves extend to the tool handle, annular ligaments spirally rising are arranged on the outer diameter of the drill bit body, and annular cooling grooves are formed in the peripheries of the annular ligaments.

Description

Strong drill bit for processing quenched steel

Technical Field

The utility model belongs to the technical field of numerical control cutting tool, concretely relates to powerful drill bit for quench steel processing.

Background

In the assembling process of the S/AMT double-intermediate-shaft transmission of the commercial vehicle, in order to prevent relative rotation between the intermediate shaft and the intermediate shaft gear in the torque transmission process, holes are respectively drilled in a required sub-assembly after the intermediate shaft and the intermediate shaft gear are pressed and used for installing cylindrical pins, as shown in figure 1. The traditional method for machining the pin hole is a process of respectively drilling bottom holes on the intermediate shaft and the four piece gears before heating, pressing after heating and then boring holes by using a CBN boring cutter. The process method needs 6 working procedures of respectively drilling holes on 5 parts before heating and boring holes by the CBN boring cutter after heating, and has more working procedures, high equipment, labor and cutter cost. In addition, because the bottom holes cannot be completely aligned after the pressing of the intermediate shaft and the sheet teeth, the boring allowance is uneven, the boring blade is frequently broke, the CBN boring blade is more in edge breakage, and the technological process is unstable. Secondly, a plurality of pin holes influence the heat treatment deformation of the intermediate shaft before heating, and the hot back is jumped greatly, resulting in difficult alignment.

For the drilling of hardened steel, the service life of the existing integral hard alloy drill bit is generally short, but because the surface hardness HRC58-63 and the hardness are high after the intermediate shaft assembly is carburized and quenched, the existing drill bit usually generates edge breakage or even cutter breakage after about 80 holes 20 are machined at most. And because the hardness of the hole in the depth direction is inconsistent, the drilled hole has conicity and poor dimensional accuracy, and needs to be finely bored or reamed, so that the machining process is more complicated and the machining cost is higher.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a powerful drill bit for hardening steel processing can reduce the process, promotes the aperture precision simultaneously, and extension cutter life reduces the processing cost by a wide margin.

The utility model discloses a realize through following technical scheme:

a powerful drill bit for processing quenched steel comprises a tool nose, a drill bit body and a tool handle which are sequentially connected;

the drill bit comprises a drill bit body and is characterized in that the core thickness of the drill bit body is not less than 30% of the outer diameter of the drill bit body, spiral channels which spirally rise along the outer peripheral wall of the drill bit body are formed in the drill bit body, spiral grooves are formed among the spiral channels, one ends of the spiral grooves extend to the tool nose, the other ends of the spiral grooves extend to the tool shank, annular ligaments which spirally rise are arranged on the outer diameter of the drill bit body, and annular cooling grooves are formed in the periphery of the annular ligaments.

Preferably, the helix angle of the helical channel is 10 to 20 degrees.

Preferably, the annular ligament is provided with a vertical groove along the rotation track of the spiral channel.

Preferably, the tip is rounded at R0.5.

Preferably, the drill body is divided into a front section and a rear section, wherein one section close to the tool tip is the front section, and the back taper of the front section part is smaller than that of the rear section part.

Preferably, the back taper of the front section part is 0.05/100mm, and the back taper of the rear section part is 0.1/100mm.

Preferably, a transition plane for connecting the drill body and the tool nose is arranged on the drill body.

Preferably, the drill bit body adopts WC-Co submicron alloy bar stock, and the material granularity is 0.5-0.8 mu m.

Preferably, the surfaces of the tool nose and the drill bit body are wrapped with AlCrN-based composite coatings.

Preferably, one end of the drill bit body, which is close to the tool shank, is provided with a chamfer.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model provides a powerful drill bit for quench steel processing can reduce the comprehensive cost of equipment, manual work and the cutter of commercial car S/AMT jackshaft assembly pinhole processing, and drilling, hot back bore hole process before the merging heat improve machining efficiency, guarantee the aperture precision. The method specifically comprises the following steps: the core thickness of the solid part in the middle of the drill bit is designed to be not less than 30% of the outer diameter of the drill bit assembly, the strength and the rigidity of the drill bit can be guaranteed by the larger core thickness, and good chip removal performance can be considered. Simultaneously, be different from conventional drill bit's linear ligament, powerful drill bit adopt the design of annular ligament, the annular ligament can provide support and guide effect all around at the pore wall, the processing vibration is little, the aperture circularity is good, and the size is stable, in addition, be provided with the annular cooling tank around the annular ligament for the cutting fluid cools off all around, reduces cutting temperature, and the cooling is more abundant, and the drill bit life-span is longer, and the helicla flute that extends to the shank portion can be convenient for make the drill bit get rid of the work piece with the sweeps when carrying out deep-hole machining outside.

Furthermore, vertical grooves are formed in the annular ligament along the rotation track of the spiral channel, and two vertical grooves are formed in the annular ligament, so that the friction force between the annular ligament and the hole wall can be reduced, and the cutting resistance is reduced.

Furthermore, the position of the cutter point is designed to be an R0.5 round corner, so that the strength of the cutter point can be improved, and meanwhile, the main cutting edge is passivated, so that the risk of tipping can be reduced.

Further, the utility model discloses in powerful drill bit adopts the design of segmentation back taper, the drill bit body divide into anterior segment and back end, and wherein, one section that is close to the knife tip is the anterior segment, and the remainder is the back end, the back taper of anterior segment part is less than the back taper of back end part. The design of making little back taper on the annular ligament of anterior segment can play vice cutting edge and repaiies the light effect for size is unanimous about the aperture, reduces the aperture tapering that the work piece hardness is uneven brings, simultaneously, reduces the pore wall roughness.

Drawings

FIG. 1 is a schematic illustration of an intermediate shaft assembly;

fig. 2 is a schematic structural view of the powerful drill of the present invention.

In the figure: the drill bit comprises a tool nose 1, a drill bit body 2, a tool shank 3, an annular ligament 4, a middle shaft 5, a first plate gear 6, a second plate gear 7, a third plate gear 8, a fourth plate gear 9, a spiral groove 10 and an annular cooling groove 11.

Detailed Description

The principles and features of the present invention will be described in further detail below with reference to the accompanying drawings, wherein the examples are provided for illustration only and are not intended to limit the scope of the invention. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a powerful drill bit for processing quenched steel, which comprises a tool nose 1, a drill bit body 2 and a tool handle 3 which are connected in sequence as shown in figure 2;

the core thickness of the drill bit body 2 is not less than 30% of the outer diameter of the drill bit assembly, spiral channels which spirally ascend along the outer peripheral wall of the drill bit body 2 are formed in the drill bit body 2, spiral grooves 10 are formed between the spiral channels, one ends of the spiral grooves 10 extend to the cutter point 1, the other ends of the spiral grooves extend to the cutter handle 3, annular ligaments 4 which spirally ascend are arranged on the outer diameter of the drill bit body 2, and annular cooling grooves 11 are formed in the periphery of the annular ligaments 4.

The utility model discloses a powerful drill bit for quench steel processing can reduce the comprehensive cost of equipment, manual work and the cutter of commercial car S/AMT jackshaft assembly pinhole processing, and drilling, hot back bore hole process before the merging heat improve machining efficiency, guarantee the aperture precision. The method specifically comprises the following steps: by designing the core thickness of the solid part in the middle of the drill bit to be not less than 30% of the outer diameter of the drill bit assembly, the larger core thickness can not only ensure the strength and rigidity of the drill bit, but also give consideration to good chip removal performance. Simultaneously, be different from the linear ligament of conventional drill bit, powerful drill bit adopt the design of annular ligament 4, annular ligament 4 can provide support and guide effect all around at the pore wall, the processing vibration is little, the aperture circularity is good, and the size is stable, in addition, be provided with annular cooling tank 11 around annular ligament 4 for cutting fluid cools off all around, reduces cutting temperature, and the cooling is more abundant, and the drill bit life-span is longer, and extend to 3 helicla flutes 10 of handle of a knife can be convenient for make the drill bit get rid of the work piece with the sweeps when carrying out deep hole processing.

The utility model relates to a powerful drill bit for quenched steel processing is applicable to the steel part processing of hardness HRC58-63 after the thermal treatment, and drilling accuracy can reach 8 grades. Use drill bit processing jackshaft assembly pinhole, can merge before hot respectively drill hole and hot back bore hole process, drilling is accomplished to a clamping after hot, cancellation bore hole process step, the aperture precision is high, the process is few, the drill bit life-span is stable, the processing cost reduces by a wide margin.

Preferably, the helix angle of the helical channel is 10 to 20 degrees. In the embodiment, the helix angle is 15 degrees, and the strength and the functionality of the drill bit are ensured by adopting the design of a small helix angle.

Preferably, vertical grooves are formed in the annular ligament 4 along the rotation track of the spiral channel, and two vertical grooves are formed in the embodiment, so that the friction force between the annular ligament 4 and the hole wall can be reduced, and the cutting resistance is reduced.

In this embodiment, the position of the tool nose 1 is designed to be an R0.5 rounded corner, so that the strength of the tool nose 1 can be improved, and the main cutting edge is passivated, thereby reducing the risk of tipping.

Preferably, the utility model discloses in powerful drill bit adopts the design of segmentation back taper, drill bit body 2 divide into anterior segment and back end, and wherein, one section that is close to knife tip 1 is the anterior segment, and the remainder is the back end, the back taper of anterior segment part is less than the back taper of back end part. The design of making little back taper on anterior segment annular ligament 4 can play vice cutting edge smoothing effect for the aperture is the same from top to bottom in size, reduces the aperture tapering that the work piece hardness is uneven brought, simultaneously, reduces the pore wall roughness.

In this embodiment, the 2 anterior segments of drill bit body are 8mm, and the back taper of 8mm department of anterior segment is 0.05/100mm, and the back taper of back end part is 0.1/100mm. The 8mm front section in this embodiment can guarantee that the drill bit can be repeated coping 4 times, and the diameter changes within 4 μm.

Preferably, the drill body 2 is provided with a transition plane for connecting the drill body 2 and the tool nose 1. The utility model discloses in through set up on drill bit body 2 revolve to with the rotatory orbit of helical coiled passage revolve to the same transition plane that is used for connecting drill bit body 2 and knife tip 1 for before drill bit body 2 gets into the downthehole of knife tip 1 cutting formation, transition plane can be pressed always on the position that the entity material of waiting to process needs to drill, thereby the position that makes the entity material need drill can not take place to warp, can keep leveling, guarantees to wait to process the quality of entity material.

Preferably, the surface hardness of the intermediate shaft and the intermediate shaft gear is HRC58-63 after carburization quenching, the Vickers hardness is about HV700, and the layer depth is 0.8-1mm, because the material of the intermediate shaft and the intermediate shaft gear is usually 8620H. In order to improve the strength and hardness of the drill bit, the powerful drill bit adopts WC-Co submicron-grade alloy bar materials, the granularity of the materials is 0.5-0.8 mu m, the hardness is HV1550, and the compressive strength is 5500N/mm ² It is suitable for drilling quenched steel.

Preferably, the surface of the tool nose 1 is wrapped with an AlCrN-based composite coating, the hardness of the coating can reach HV3400, the coating has high hardness, high temperature resistance and low friction coefficient, and the wear resistance of a drill bit for processing a high-hardness workpiece can be improved.

Preferably, the end of the drill body 2 close to the tool holder 3 is provided with a chamfer, a chamfer cutting edge is arranged on the chamfer, and through the chamfer cutting, the chamfer cutting edge is spirally arranged and rotates to the same direction as the rotation track of the spiral channel, so that the chamfer cutting edge can smoothly cut the edge of the hole and simultaneously the scraps generated by the chamfer cutting edge on the edge of the hole can be smoothly discharged.

A powerful drill bit for quench steel processing, the working process when its use is as follows:

1) Preparing a cutter; before the installation, ensure that 3 downtheholes clean nothing of handle of a knife 3, the reducing cover of high accuracy powerful drill and hydraulic tool handle are debris, then place hydraulic tool handle 3 on adorning the blade holder, pack into reducing cover, high accuracy powerful drill in proper order, tighten hydraulic tool handle 3 again and fasten the bolt.

2) The tool is long; and (3) placing the assembled tool shank 3 on a tool setting gauge, and reading and recording the length of the tool nose 1 at the moment.

3) Installing a cutter; and (3) installing the tool shank 3 into a main shaft of the machining center, and inputting the length of the tool in the step (2).

4) Feeding; the workpiece is mounted on the machine tool fixture.

5) Programming; and establishing a workpiece coordinate system and programming a drilling program.

6) Trial cutting and processing; starting procedure, use the drill bit accomplish drilling processing.

The utility model discloses in a powerful drill bit for quench steel processing, can make one of the high accuracy hole of quench steel bore forming process and can implement, replace boring and the hot back bore hole process many times before the heat completely, reduce the aperture tapering that leads to because of hardness is inconsistent, size precision and surface quality are high, cutter life-span is stable.

At present, tests show that the strong drill bit, the S and AMT transmission intermediate shaft assembly have been completely subjected to heat exchange and then subjected to drilling process, the equipment, labor, combustion and cutter costs are reduced due to process combination, after accounting, the cost of an original hot front tooth drilling single piece is 3.27 yuan, the cost of an intermediate shaft drilling single piece is 5.13 yuan, and the cost of a hot rear boring single piece is 5.3 yuan; after improvement, the cost of the assembly single piece is 12.14 yuan. A single intermediate shaft assembly reduces the cost by 3.27 + 4+5.13+5.3-12.14=11.37 yuan. The annual output of S and AMT transmissions is about 12W, each transmission is provided with two intermediate shaft assemblies, and the annual cumulative cost is reduced by about 272.9 ten thousand yuan. Application of powerful drill bit can show reduction in processing cost, promote machining efficiency and processingquality simultaneously

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the present invention can be smoothly implemented by those skilled in the art according to the drawings and the above description; however, those skilled in the art should understand that the equivalent embodiments of the present invention are equivalent embodiments of the present invention, and that the changes, modifications and evolutions made by the above-disclosed technical contents are not departed from the technical scope of the present invention; meanwhile, any changes, modifications, evolutions, etc. of equivalent changes made to the above embodiments according to the essential technology of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A powerful drill bit for processing quenched steel is characterized by comprising a tool nose (1), a drill bit body (2) and a tool shank (3) which are connected in sequence;

the drill bit comprises a drill bit body (2), wherein the core thickness of the drill bit body (2) is not less than 30% of the outer diameter of the drill bit body (2), spiral channels which spirally rise along the outer peripheral wall of the drill bit body (2) are formed in the drill bit body (2), spiral grooves (10) are formed among the spiral channels, one ends of the spiral grooves (10) extend to the tool nose (1) and the other ends of the spiral grooves extend to the tool shank (3), spirally-rising annular ligaments (4) are arranged on the outer diameter of the drill bit body (2), and annular cooling grooves (11) are formed in the periphery of the annular ligaments (4).

2. A power drill for hard hardening steel processing according to claim 1, wherein a helix angle of the helical channel is 10 to 20 degrees.

3. A power drill for processing of hardened steel according to claim 1, characterized in that said annular ligament (4) is provided with vertical grooves along the rotation trajectory of the helical channel.

4. A power drill for hardened steel machining according to claim 1, characterized in that the tip (1) is rounded with an R0.5 radius.

5. A power drill for hardened steel working according to claim 1, characterized in that the drill body (2) is divided into a front section and a rear section, wherein the section near the tip (1) is the front section, and the back taper of the front section is smaller than that of the rear section.

6. A power drill for hardened steel working as claimed in claim 5 wherein the back taper of the front section is 0.05/100mm and the back taper of the rear section is 0.1/100mm.

7. A power drill for hard steel working according to claim 1, characterized in that the drill body (2) is provided with a transition plane connecting the drill body (2) and the tip (1).

8. A power drill bit for hardened steel processing according to claim 1, characterized in that said bit body (2) is made of WC-Co submicron grade alloy bar with a material grain size of 0.5-0.8 μm.

9. A power drill bit for hardened steel machining according to claim 1, characterized in that the tip (1) and the bit body (2) are both surface coated with AlCrN based composite coating.

10. A power drill for hardened steel machining according to claim 1, characterized in that the end of the drill body (2) near the shank (3) is provided with a chamfer.