CN211101742U

CN211101742U - Special high-precision stepped drill for machining heat-resistant cast steel

Info

Publication number: CN211101742U
Application number: CN201921898041.1U
Authority: CN
Inventors: 李振丰; 奚旭东; 孔小波; 张明敏
Original assignee: D&m Suzhou Precision Cutting Tools Co ltd
Current assignee: D&m Suzhou Precision Cutting Tools Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-07-28
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a special high-accuracy ladder of heat-resisting cast steel of processing bores, including cutter body and stalk portion, the cutter body contains drill bit and drill bit, the drill bit is located the foremost of cutter body, and the drill bit is located the cutter body afterbody on the surface, the stalk portion is located the end of cutter body, 3 cutting blades of circumference evenly distributed are followed to the preceding terminal surface of drill bit, form the chip groove between per two cutting blades, cutting blade and chip groove are anterior along axial extension to the stalk portion, the blade on the cutting blade is the waveform. The utility model discloses a special high-accuracy ladder of heat-resisting cast steel of processing has adopted three sword ripples sword tool bits, has increased the linear length of cutting edge, under the prerequisite of guaranteeing cutting performance, guarantees cutter blade intensity, and the atress is balanced during the cutting simultaneously, is difficult for producing the vibration, and the blade uses the fine finishing of ultrafine particle emery wheel, and surface finish is high, reduces the probability that iron fillings glue the blade, improves the cutter wearability.

Description

Special high-precision stepped drill for machining heat-resistant cast steel

Technical Field

The utility model belongs to the technical field of metal cutting tool, concretely relates to special high-accuracy ladder of heat-resisting cast steel of processing bores.

Background

In recent decades, rapid development of petrochemical industry, metallurgical machinery and building material industry promotes the development of Chinese heat-resistant cast steel, the service temperature of the heat-resistant cast steel is as high as 1000-1200 ℃, some heat-resistant cast steel is as high as 1250 ℃, the heat-resistant cast steel bears higher stress, the heat-resistant cast steel works under the conditions of carburizing atmosphere and gas mostly, the service life of the material is required to be 6-10 years in the aspect of petrochemical industry, the material is required to have higher lasting strength, good carburization resistance and oxidation resistance at the service temperature and tissue stability after long-time use, and therefore strengthening elements such as tungsten, molybdenum, niobium, cobalt and the like are added on the basis of higher content of chromium and nickel to meet the use requirements. Under the condition of the same chemical components, the cast state has higher heat strength than the rolled state, the casting process is simple, the cost is lower, and the problem that high alloy steel is difficult to deform and process is solved, so that the cast material occupies a larger proportion in the field of heat-resistant steel. The special difficult processing that leads to the cutter of material causes cutting sharpening to decrease and the condition of collapsing a mouthful more easily during the cutting, leads to the cutter life-span low, the utility model aims to provide a special high-accuracy ladder of heat-resisting cast steel of processing bores to solve the problem that proposes in the above-mentioned background art.

Disclosure of Invention

Utility model purpose: in order to overcome not enough above, the utility model aims at providing a special high-precision ladder of heat-resisting cast steel of processing bores, forms three sword ripples sword ladder through special sword type design and bores, under the prerequisite of guaranteeing cutting performance, guarantees the intensity of cutter blade, and the blade uses ultrafine particle emery wheel finish machining, and roughness can reach Ra0.05, has reduced the probability that iron fillings glue the blade, improves the cutter wearability.

In order to realize the above-mentioned purpose, the utility model provides a special high-accuracy ladder of heat-resisting cast steel of processing bores, including cutter body and stalk portion, the cutter body contains drill bit and drill bit, the drill bit is located the foremost of cutter body, and the drill bit is located the cutter body afterbody on the surface, the stalk portion is located the end of cutter body, 3 cutting edges of circumference evenly distributed are followed to the preceding terminal surface of drill bit, form the chip groove between per two cutting edges, cutting edge and chip groove extend to the stalk portion front portion along the axial.

Furthermore, the drill bit is a twist drill, the edge on the drill bit has good guiding effect, and the axis is not easy to incline.

Furthermore, according to the special high-precision stepped drill for machining the heat-resistant cast steel, the cutting edge on the cutting edge is in a waveform shape, the linear length of the cutting edge is increased, and the strength of the cutting edge of the cutter is guaranteed on the premise that the cutting performance is guaranteed.

Furthermore, the special high-precision stepped drill for processing the heat-resistant cast steel has the advantages that the surface roughness of the cutting edge is Ra0.1-Ra0.05, the surface is ultra-smooth, the probability that scrap iron is adhered to the cutting edge is reduced, and the wear resistance of the cutter is improved.

Furthermore, according to the special high-precision stepped drill for machining the heat-resistant cast steel, the inner cooling hole is formed in the center of the surface of the blade section and extends to the end face of the tail end of the handle part along the axial direction, and the inner cooling structure is arranged, so that the path of cooling liquid is changed, and poor heat dissipation of the cutter body is avoided.

Furthermore, foretell special high-accuracy ladder of heat-resisting cast steel of processing bores, the axis of drill blade and whole cutter body is 45 degrees contained angles, and drill way chamfer one shot forming reduces the tool changing, simplifies the process, improves work efficiency.

Furthermore, the circumference of the drill bit is provided with the edge, and the surface roughness of the processed surface is reduced by strong extrusion of the edge.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses in three sword ripples sword tool bits, increased the linear length of cutting edge, under the prerequisite of guaranteeing cutting performance, guarantee cutter blade intensity.

2. The utility model discloses in the drill bit adopt fluted drill, the direction is good, the axiality is high, the geometrical symmetric distribution of three sword, the atress is balanced during the cutting, is difficult for producing the vibration.

3. The utility model discloses in the blade use superfine particle emery wheel finish machining, the surface finish is high, roughness can reach Ra0.05, reduces the probability that iron fillings glue glutinous blade, improves the cutter wearability.

4. The utility model discloses in every cutting edge on set up interior cold hole, not only high-efficient heat dissipation avoids the heat altered shape of cutter, has still promoted the discharge of smear metal.

5. The utility model discloses in the drill bit outer fringe set up the edge, improved the pore wall smooth finish under the condition that does not need any process.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the blade end of the present invention.

Detailed Description

The invention will be further elucidated with reference to the drawings and the specific embodiments.

Examples

The utility model relates to a processing heat-resisting special high-accuracy ladder of cast steel bores's structural schematic diagram is shown in fig. 1, including cutter body and stalk portion, the cutter body contains drill bit 1 and drill bit 2, drill bit 1 is located the foremost of cutter body, and drill bit 2 is located the cutter body afterbody on the surface, stalk portion 3 is located the end of cutter body, 3 sword lamellas 10 of circumference evenly distributed are followed to the preceding terminal surface of drill bit 1, form chip groove 4 between per two sword lamella 10, sword lamella 10 and chip groove 4 extend to stalk portion 3 front portions along the axial.

Furthermore, according to the special high-precision stepped drill for machining the heat-resistant cast steel, the drill bit 1 is a twist drill, the cutting edge 10 and the chip groove 4 extend spirally, the edge guiding effect on the drill bit is good, and the axis is not prone to deflection.

Further, as shown in fig. 2, the cutting edge 101 of the cutting edge land 10 is wavy, so that the linear length of the cutting edge 101 is increased, and the strength of the cutting edge of the cutting tool is ensured on the premise of ensuring the cutting performance.

Preferably, in the special high-precision stepped drill for machining the heat-resistant cast steel, the cutting edge 101 is subjected to finish machining by using the ultrafine particle grinding wheel, the surface roughness is Ra0.1-Ra0.05, the surface is ultra-smooth, the probability that scrap iron is adhered to the cutting edge is reduced, and the wear resistance of the cutter is improved.

Furthermore, according to the special high-precision stepped drill for machining the heat-resistant cast steel, the inner cooling hole 5 is formed in the center of the surface of the cutting edge 10, the inner cooling hole 5 axially extends to the end face of the tail end of the handle portion 3, an inner cooling structure is arranged, high-pressure water or other low-temperature liquid gas is injected from the end face of the tail end of the handle portion 3 in the machining process, a cooling liquid path is changed, poor heat dissipation of a cutter body is avoided, chips can be impacted, and the chips are prevented from being adhered.

Further, as shown in fig. 1, the drill blade 2 and the axis of the whole tool body form an included angle of 45 degrees, and the orifice chamfer is formed at one step after tapping, so that tool changing is reduced, the process is simplified, and the working efficiency is improved.

Further, as shown in fig. 2, the drill bit 1 is provided with an edge 11 on the circumference, and the surface roughness of the machined surface is reduced by the strong extrusion of the edge 11.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a special high-accuracy ladder of heat-resisting cast steel of processing bores which characterized in that: the drill bit comprises a cutter body and a handle part, wherein the cutter body comprises a drill bit (1) and a drill blade (2), the drill bit (1) is located at the foremost end of the cutter body, the drill blade (2) is located on the surface of the tail part of the cutter body, the handle part (3) is located at the tail end of the cutter body, 3 cutting edges (10) are evenly distributed on the front end surface of the drill bit (1) along the circumference, a chip discharge groove (4) is formed between every two cutting edges (10), and the cutting edges (10) and the chip discharge groove (4) axially extend to the front part of the handle part (3).

2. The special high-precision stepped drill for processing heat-resistant cast steel according to claim 1, characterized in that: the drill bit (1) is a twist drill.

3. The special high-precision stepped drill for processing heat-resistant cast steel according to claim 1, characterized in that: the cutting edge (101) on the cutting edge land (10) is wave-shaped.

4. The special high-precision stepped drill for processing heat-resistant cast steel according to claim 3, characterized in that: the surface roughness of the cutting edge (101) is Ra0.1-Ra0.05.

5. The special high-precision stepped drill for processing heat-resistant cast steel according to claim 1, characterized in that: an inner cooling hole (5) is formed in the center of the surface of the cutting edge (10), and the inner cooling hole (5) extends to the end face of the tail end of the handle (3) along the axial direction.

6. The special high-precision stepped drill for processing heat-resistant cast steel according to claim 1, characterized in that: the drill blade (2) and the axis of the whole cutter body form a 45-degree included angle.

7. The special high-precision stepped drill for processing heat-resistant cast steel according to claim 1, characterized in that: the circumference of the drill bit (1) is provided with an edge (11).