CN-121988777-A - Drilling chamfering tool and drilling chamfering method thereof

CN121988777ACN 121988777 ACN121988777 ACN 121988777ACN-121988777-A

Abstract

The application discloses a drilling chamfering tool and a drilling chamfering method thereof, wherein a tool bit part of the drilling chamfering tool is sequentially provided with a chamfering section, a transition section and a drill tip section, the outer diameter of the chamfering section is larger than that of the drill tip section, at least one chamfering blade is arranged on the periphery of the chamfering section, at least one drilling blade is arranged on the periphery of the drill tip section, at least one chip removing groove is further arranged on the periphery of the drill tip section, the chip removing groove spirally extends from the periphery of the drill tip section to the joint between the transition section and the chamfering section, at least one chip breaking structure is arranged on the groove wall of the chip removing groove corresponding to the drill tip section, and the chip breaking structure is recessed inwards along the radial direction of the drill tip section to form chip breaking pits or protrudes outwards along the radial direction of the drill tip section to form chip breaking bosses. According to the technical scheme, drilling and chamfering can be finished at one time, so that machining efficiency is remarkably improved, clamping errors are reduced, chip removal efficiency is remarkably improved, the phenomenon that long chips are wound around a cutter body is avoided, and working stability, service life and machining surface quality of the cutter body are improved.

Inventors

ZHANG ZAO
LU ZHIYONG
LIU WENJIE

Assignees

深圳市鑫运祥精密刀具有限公司
湖北鑫运祥科技发展有限公司

Dates

Publication Date: 20260508
Application Date: 20260407

Claims (10)

1. The drilling and chamfering tool is characterized by comprising a tool bit part and a tool body part which are connected, wherein the tool bit part is sequentially provided with a chamfering section, a transition section and a drill tip section along the direction far away from the tool body part, the outer diameter of the chamfering section is larger than that of the drill tip section, at least one chamfering blade is arranged on the periphery of the chamfering section, and at least one drilling blade is arranged on the periphery of the drill tip section; The peripheral side of the drill tip section is also provided with at least one chip removal groove which extends from the peripheral side of the drill tip section to the joint between the transition section and the chamfer section in a spiral manner; The chip removal groove is provided with at least one chip breaking structure corresponding to the groove wall of the drill tip section, the chip breaking structure is recessed inwards along the radial direction of the drill tip section to form a chip breaking pit, or protrudes outwards along the radial direction of the drill tip section to form a chip breaking boss, and the chip breaking structure is arranged to enable the chip to be curled or bent to break at the initial stage of chip formation.
2. The drill chamfering tool according to claim 1, wherein there are two junk slots, and two junk slots are provided on the peripheral side of the cutter head portion in central symmetry.
3. The drilling chamfer tool of claim 2, wherein the end of the drill tip section away from the transition section is a cone structure, each junk slot extends helically to the cone surface of the cone structure, and a side slot wall of each junk slot corresponding to the drill tip section is protruded on the periphery of the drill tip section to form the drilling blade; The drilling chamfering tool further comprises two chamfering tool grains, two tool grain mounting grooves are formed in the periphery of the chamfering section, the two tool grain mounting grooves and the two chip removal grooves are in one-to-one correspondence, each tool grain mounting groove is communicated with the corresponding chip removal groove, one side groove wall of each tool grain mounting groove is provided with one chamfering tool grain, and each chamfering tool grain is at least partially protruding to the periphery of the chamfering section so as to form one chamfering cutting edge.
4. The drilling and chamfering tool as set forth in claim 3, wherein said chamfering tool grains are detachably mounted on one side wall of the corresponding tool grain mounting groove by a first screw structure, and/or, The drill tip section is detachably arranged on the end face of one end, far away from the chamfer section, of the transition section through a second screw structure, and the drill tip section and the transition section are connected through the cooperation of two tooth-shaped surfaces which are mutually tightly combined.
5. The drilling and chamfering tool as set forth in claim 3, wherein the chamfering tool grains are made of an alloy material and the surface of the chamfering tool grains is provided with a wear-resistant coating, and/or, The drill tip section is made of alloy materials, and the surface of the drill tip section is provided with a wear-resistant coating.
6. The drill chamfer tool of claim 5, wherein the alloy material comprises tungsten carbide, cobalt, tantalum carbide, and rhenium, wherein the cobalt is present in an amount of 5% -7%, the tantalum carbide is present in an amount of 2% -4%, and the rhenium is present in an amount of 0.5% -1.5%.
7. The drill chamfer tool of any one of claims 1-6, wherein the head portion incorporates at least one first internal cooling channel, an outlet of each first internal cooling channel being exposed at a surface of the drill tip section; The cutter body is internally provided with a second internal cooling channel extending along the axial direction of the cutter body, one end of the second internal cooling channel is externally connected with a cooling liquid supply pipeline, and the other end of the second internal cooling channel extends to the cutter head and is communicated with inlets of all the first internal cooling channels.
8. The drill chamfer tool of claim 7, wherein the head portion has two first internal cooling passages disposed therein, the outlet of each first internal cooling passage being disposed obliquely to the surface of the drill tip section, and the direction of inclination of the outlet of each first internal cooling passage being in accordance with the helical direction of one of the junk slots, the angle between the axis of each first internal cooling passage and the axis of the drill tip section being 15-30 DEG, and/or, The cutter body is of a cylindrical structure, and at least one clamping plane is arranged on the periphery of the cutter body so as to facilitate clamping and fixing of the cutter body.
9. A method of drilling and chamfering, the method comprising: providing a drilling and chamfering tool according to any of claims 1-8, clamping the drilling and chamfering tool on a spindle of a high-speed drilling apparatus; And setting working parameters of the high-speed drilling equipment according to the target drilling aperture so as to drive the drilling chamfering tool to rotate and feed under the working parameters, so that a target drilling hole is machined on a workpiece to be machined.
10. The drill chamfering method as recited in claim 9, wherein said operating parameters include a cutter rotational speed and a cutter feed speed, said setting operating parameters of said high-speed drill according to a target drill hole diameter includes setting said cutter rotational speed to be 1250rpm to 1350 rpm, said cutter feed speed to be 260mm/min to 280mm/min, setting said cutter rotational speed to be 1150rpm to 1250rpm, said cutter feed speed to be 240mm/min to 260mm/min, and setting said cutter rotational speed to be 1050rpm to 1150 mm/min, and/or setting said cutter feed speed to be 220mm/min to 240mm/min, if a target drill hole diameter is 13.7mm to 15.7mm, and/or, The drilling chamfering method further comprises the steps of monitoring the spindle load of the high-speed drilling equipment in real time in the machining process, automatically reducing the feeding speed of the cutter or suspending feeding of the cutter when the spindle load is monitored to exceed a preset load threshold, and triggering chip removal cleaning prompt.

Description

Drilling chamfering tool and drilling chamfering method thereof Technical Field The application relates to the technical field of drilling and chamfering processing, in particular to a drilling and chamfering tool and a drilling and chamfering method thereof. Background In the related art, during the machining of workpieces such as hot rolled spring flat steel, it is often necessary to drill holes in the workpieces and to simultaneously finish the machining operation of the hole chamfer. The traditional processing mode adopts the separation procedures of drilling firstly and replacing the tool with a chamfer later, so that the processing efficiency is low, and the processing error is easy to be caused by repeated clamping. Although the traditional composite cutter tries to combine the drilling and chamfering functions, the problems of unsmooth chip removal and the like often exist, because the chip removal structure of the traditional composite cutter is designed poorly when deep holes are machined, and the drill tip section lacks an effective chip breaking control means, so that continuous strip chips are easy to form when materials with higher toughness are cut. The long chips are wound on the cutter body or block the chip removal groove, so that not only is the abrasion of the cutter increased, but also the cutting heat accumulation and the quality reduction of the processed surface are caused, and even the cutter tipping or the scrapping of the workpiece is caused when the cutting heat accumulation and the quality reduction are serious, so that the high-efficiency and stable automatic processing requirement is difficult to meet. Disclosure of Invention The application aims to provide a drilling chamfering tool and a drilling chamfering method thereof, and aims to solve the problems that the design of a chip removal structure of a traditional composite tool is poor, an effective chip breaking control means is lacked in a drill tip section, continuous strip chips are easy to form when materials with high toughness are cut, and the requirements of efficient and stable automatic processing are difficult to meet. To achieve the purpose, the embodiment of the application provides a drilling and chamfering tool, which comprises a tool bit part and a tool body part which are connected, wherein the tool bit part is sequentially provided with a chamfering section, a transition section and a drill tip section along the direction away from the tool body part, the outer diameter of the chamfering section is larger than that of the drill tip section, at least one chamfering blade is arranged on the periphery of the chamfering section, and at least one drilling blade is arranged on the periphery of the drill tip section; The peripheral side of the drill tip section is also provided with at least one chip removal groove which extends from the peripheral side of the drill tip section to the joint between the transition section and the chamfer section in a spiral manner; The chip removal groove is provided with at least one chip breaking structure corresponding to the groove wall of the drill tip section, the chip breaking structure is recessed inwards along the radial direction of the drill tip section to form a chip breaking pit, or protrudes outwards along the radial direction of the drill tip section to form a chip breaking boss, and the chip breaking structure is arranged to enable the chip to be curled or bent to break at the initial stage of chip formation. Alternatively, in some embodiments of the present application, the number of the chip grooves is two, and the two chip grooves are arranged on the circumference side of the cutter head part in a central symmetry manner. Optionally, in some embodiments of the present application, an end of the drill tip section away from the transition section is a cone structure, each chip groove extends to a conical surface of the cone structure in a spiral manner, and a groove wall of one side of each chip groove corresponding to the drill tip section is protruding on a peripheral side of the drill tip section so as to form one drilling blade; The drilling chamfering tool further comprises two chamfering tool grains, two tool grain mounting grooves are formed in the periphery of the chamfering section, the two tool grain mounting grooves and the two chip removal grooves are in one-to-one correspondence, each tool grain mounting groove is communicated with the corresponding chip removal groove, one side groove wall of each tool grain mounting groove is provided with one chamfering tool grain, and each chamfering tool grain is at least partially protruding to the periphery of the chamfering section so as to form one chamfering cutting edge. Alternatively, in some embodiments of the present application, the chamfer cutter particles are detachably mounted on one side groove wall of the corresponding cutter particle mounting groove by a first screw structure, and/or, The drill tip