CN110293244B

CN110293244B - Deep hole drilling method for tiny thin-wall part

Info

Publication number: CN110293244B
Application number: CN201910534796.1A
Authority: CN
Inventors: 王金波; 孟德辉; 郭文平
Original assignee: Suzhou Jenitek Precision Device Co ltd
Current assignee: Suzhou Zhenyi Medical Co ltd
Priority date: 2019-06-20
Filing date: 2019-06-20
Publication date: 2020-12-01
Anticipated expiration: 2039-06-20
Also published as: CN110293244A

Abstract

The invention discloses a deep hole drilling method for a tiny thin-wall part, which is characterized by comprising the following steps of: step SS 1: centering the product by using a centering drill, setting the drilling depth and reserving the machining allowance for the next drill bit; step SS 2: drilling a product by using a middle drill bit, controlling the drilling depth and reserving the machining allowance for the next drill bit; step SS 3: and (3) drilling the product by adopting a long drill bit, controlling the drilling depth and reserving single-side allowance. The invention provides a drill bit processing technology of a thin-wall part with a small long wire diameter ratio, aiming at the technical problems that the wire diameter ratio of a drill bit is too long, and after the drill bit vibrates, a hole is easy to generate drill eccentricity, wall breaking and fracture; the process optimizes the process from the aspects of tool selection, rotating speed, feeding, control of cutting amount and cutting reserve, drilling cutting feeding method and the like, thereby solving the technical problems that a micro drill bit thin-wall deep hole drill is easy to be eccentric, is wound with chips, is easy to break, and the like.

Description

Deep hole drilling method for tiny thin-wall part

Technical Field

The invention relates to a deep hole drilling method for a tiny thin-wall part, and belongs to the technical field of machining.

Background

As shown in fig. 4, for the conventional drilling process, the material removing part is conical after the centering drill is used for processing; then as shown in fig. 5, the drill bit is processed with a cone shape, so that the stress is suddenly increased when the drill bit is processed at the orifice and is in contact with the material, and the drill bit is vibrated due to the overlong linear diameter ratio, so that the problems of drilling eccentricity, wall breaking and breakage are very easily caused in the hole. As shown in fig. 6, a schematic diagram of conventional feed is shown, and a specific numerical control feed process is as follows: G0X0Y0Z15T 31; G0Z0.2, respectively; G83Z-7.0 Q10000F0.01; 1, G83 (deep hole pecking drill); 2, Z-7.0 (borehole depth); 3, G0Z0.2 (distance from the surface of the workpiece); 4, F (feed per revolution); 5, Q (depth per drill).

The feed mode drill bit has residual drill cuttings, so that secondary cutting of a drill hole is caused; the cutter advancing and retreating in the above G83 pecking mode is a fast feed G0. This feed mode can result in cuttings remaining on the drill bit resulting in secondary cutting of the borehole, a key factor affecting minor borehole eccentricities and drill bit breakage.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, solve the technical problems and provide a deep hole drilling method for a tiny thin-wall part.

The invention adopts the following technical scheme: the deep hole drilling method for the tiny thin-wall part is characterized by comprising the following steps of:

step SS 1: centering the product by using a centering drill, setting the drilling depth and reserving the machining allowance for the next drill bit;

step SS 2: drilling a product by using a middle drill bit, controlling the drilling depth and reserving the machining allowance for the next drill bit;

step SS 3: and (3) drilling the product by adopting a long drill bit, controlling the drilling depth and reserving single-side allowance.

As a preferred embodiment, the setting of the drilling depth in step SS1 specifically includes: the single feed amount of the drill bit is 35-85% of the diameter of the drill bit.

As a preferred embodiment, the machining allowance in the step SS1 is: 0.01-0.07 mm.

As a preferred embodiment, the controlling the drilling depth in step SS2 specifically includes: the single feed amount of the medium drill bit is 45-80% of the diameter of the drill bit.

As a preferred embodiment, the machining allowance in the step SS2 is: 0.01-0.07 mm; the well drill bit is guaranteed to completely enter the hole under the condition of small stress, so that the vibration of the well drill bit is effectively controlled, and when the stress is increased, the surrounding materials of the well drill bit are surrounded, so that the well drill bit can stably drill along a fixed direction.

As a preferred embodiment, the controlling the drilling depth in step SS3 specifically includes: the single feed amount of the long drill bit is 40-70% of the diameter of the long drill bit.

As a preferred embodiment, the single-side margin in the step SS3 is 0.01-0.07 mm, so that the long drill bit is ensured to completely enter the hole under a condition of small stress, and the vibration of the long drill bit is effectively controlled; when the stress is increased, the surrounding materials of the long drill bit form a surrounding, so that the long drill bit can drill stably along a fixed direction.

The invention achieves the following beneficial effects: the invention provides a drill bit processing technology of a thin-wall part with a small long line diameter ratio, and belongs to the technical field of machining, aiming at the technical problems that the stress is suddenly increased when a drill bit is processed in an orifice and is contacted with a material due to the fact that the existing centering drill is reserved with a cone shape after being processed, and the drill bit is easy to drill eccentricity, break walls and fracture after the drill bit vibrates due to the fact that the line diameter ratio of the drill bit is too long; the process of the invention optimizes the process from the aspects of cutter selection, rotating speed, feeding, cutting amount and cutting allowance control, drilling cutting feeding method and the like, thereby solving the technical problems that a micro drill bit thin-wall deep hole drill is easy to be eccentric, is easy to be wrapped with chips, is easy to break, and the like, and the invention can process a thin-wall deep hole product with the thinnest wall thickness of 0.03mm and the depth of 9mm, and further comprises the following steps of controlling the processing allowance of the drill bit: 0.01-0.07 mm; the middle drill bit is ensured to completely enter the hole under the condition of small stress, so that the vibration of the middle drill bit is effectively controlled, and when the stress is increased, the surrounding materials of the middle drill bit are surrounded, so that the middle drill bit can stably drill along a fixed direction; the single-side allowance of the long drill bit is controlled to be 0.01-0.07 mm, so that the long drill bit is ensured to completely enter a hole under a state of small stress, and the vibration of the long drill bit is effectively controlled; when the stress is increased, the surrounding materials of the long drill bit form a surrounding, so that the long drill bit can drill stably along a fixed direction.

Drawings

Fig. 1 is a schematic structural view in front view of a preferred embodiment of a minute thin-walled part of the present invention.

Fig. 2 is a schematic structural view of the F-F view of fig. 1.

Fig. 3 is a schematic structural view of a perspective view of a preferred embodiment of the minute thin-walled part of the present invention.

Fig. 4 is a schematic structural diagram of a first step of a conventional drilling process.

Fig. 5 is a schematic structural view of a second step of a conventional drilling process.

Fig. 6 is a schematic structural view of step three of the conventional drilling process.

FIG. 7 is a schematic diagram of the configuration of the present invention using pilot drill processing.

FIG. 8 is a schematic diagram of the structure of the present invention using a medium bit.

Fig. 9 is a schematic view of the structure of the present invention using a long drill for machining.

FIG. 10 is a schematic view of the numerical control machining structure of the deep drilled hole of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1, 2 and 3, the product line diameter of the tiny thin-walled part aimed by the invention is longer, the wall is thin and the structure is complex.

The invention adopts the following technical scheme: the deep hole drilling method for the tiny thin-wall part is characterized by comprising the following 3 steps.

As shown in fig. 7, step SS 1: centering the product by using a centering drill, setting the drilling depth and reserving the machining allowance for the next drill bit; as a preferred embodiment, the setting of the drilling depth in step SS1 specifically includes: the single feed amount of the drill bit is 35 to 85 percent of the diameter of the drill bit; as a preferred embodiment, the machining allowance in the step SS1 is: 0.01-0.07 mm.

As shown in fig. 8, step SS 2: drilling a product by using a middle drill bit, controlling the drilling depth and reserving the machining allowance for the next drill bit; as a preferred embodiment, the controlling the drilling depth in step SS2 specifically includes: the single feed amount of the medium drill bit is 45-80% of the diameter of the drill bit.

As shown in fig. 9, step SS 3: drilling a product by using a long drill bit, controlling the drilling depth and reserving single-side allowance; as a preferred embodiment, the controlling the drilling depth in step SS3 specifically includes: the single feed amount of the long drill bit is 40-70% of the diameter of the long drill bit; as a preferred embodiment, the single-side margin in the step SS3 is 0.01-0.07 mm, so that the long drill bit is ensured to completely enter the hole under a condition of small stress, and the vibration of the long drill bit is effectively controlled; when the stress is increased, the surrounding materials of the long drill bit form a surrounding, so that the long drill bit can drill stably along a fixed direction.

As shown in FIG. 10, the numerical control process of the present invention uses G1 mode to drill holes, which can effectively control the bit advance and retreat speed and the retreat Z coordinate. The drilling chips are easier to be washed clean by the cutting fluid, and secondary cutting is avoided.

The specific numerical control program is as follows: G0Y0T32D 0; G0X0.0, respectively; G0Z0.5, respectively; G95G01Z0.2F0.1, respectively; G1Z0F0.003-G1 cut feed; G1Z2.0F0.15, G1 rapid withdrawal; G1Z0.1F0.06, medium-speed feed in G1; G1Z-1.0F 0.003; G1Z2.0F0.15, respectively; G1Z-0.9F 0.06; G1Z-2.0F 0.003.

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

Claims

1. The deep hole drilling method for the tiny thin-wall part is characterized by comprising the following steps of:

step SS 1: centering the product by using a centering drill, setting the drilling depth and reserving the machining allowance for the next drill bit; the setting of the drilling depth in step SS1 specifically includes: the single feed amount of the drill bit is 35 to 85 percent of the diameter of the drill bit;

step SS 2: drilling a product by using a middle drill bit, controlling the drilling depth and reserving the machining allowance for the next drill bit; the controlling of the drilling depth in the step SS2 specifically includes: the single feed amount of the middle drill bit is 45-80% of the diameter of the drill bit; the machining allowance in the step SS2 is as follows: 0.01-0.07 mm; the middle drill bit is ensured to completely enter the hole under the condition of small stress, so that the vibration of the middle drill bit is effectively controlled, and when the stress is increased, the surrounding materials of the middle drill bit are surrounded, so that the middle drill bit can stably drill along a fixed direction;

step SS 3: drilling a product by using a long drill bit, controlling the drilling depth and reserving single-side allowance; the controlling of the drilling depth in the step SS3 specifically includes: the single feed amount of the long drill bit is 40-70% of the diameter of the long drill bit.

2. The deep hole drilling method for a minute thin-walled part according to claim 1, wherein said machining allowance in said step SS1 is: 0.01-0.07 mm.

3. The deep hole drilling method for a minute thin-walled part according to claim 1, wherein the one-side margin in step SS3 is 0.01 to 0.07 mm.