A method for processing manifold deep hole

Abstract

The present invention discloses a method for processing a manifold deep hole, which includes the following steps: S1: reserving a process auxiliary block at the end of the manifold; S2: drilling a guide hole with an alloy drill; S3: milling a chip groove on the outer peripheral wall of the auxiliary block, and drilling an auxiliary hole on the basis of the guide hole; S4: replacing an alloy drill with a spiral groove length only 8-12 times the drill bit diameter; S5: using a low speed of 30 to 50 revolutions per minute to enter the guide hole; S6: each time the drill is pecking, the predetermined depth is 1-2 times the long drill bit diameter, and each time the drill is pecking and the chip is withdrawn, the drill is withdrawn to between the chip groove and the hole surface of the auxiliary block to ensure that the drill is not completely withdrawn from the auxiliary hole. When the drill is withdrawn, aluminum chips will be discharged from the chip groove and the drill bit will be cooled; S7: removing the reserved process auxiliary block. The present invention does not cause the quality problem of drill bit breakage during processing. Due to the auxiliary block for chip removal, the problems of drill bit swing and poor chip removal are effectively avoided, and there is no out-of-tolerance phenomenon of hole diameter. The processing quality is stable and reliable. The heat dissipation effect of the drill bit is improved by designing the auxiliary hole.

Description

Technical Field

[0001] The invention relates to the technical field of deep hole processing on parts, and in particular to a method for processing a manifold deep hole. Background Art

[0002] When processing manifold parts of aviation components, these parts have more exhaust holes. The aspect ratio of these holes (hole depth to hole diameter) is large, and the aspect ratio of the holes can even exceed 50 times. In addition, the hole size accuracy, surface finish and position accuracy are required to be high.

[0003] In the existing processing, due to the large length-to-diameter ratio of the hole, the drill bit is too long. For example, when processing a hole with a diameter of Φ3mm and a depth of more than 135mm, deep hole pecking drilling is used according to the previous hole processing idea. The depth of each pecking drilling is 1-2mm. Due to the large hole depth in this type of processing, when the hole depth exceeds 10 times the hole diameter, the chips are easily blocked in the spiral groove of the tool and cannot be discharged, causing the drill bit to break in the hole. To discharge the chips, when the pecking drilling tool is retracted, it must be retracted to the outside of the hole to take the chips out. However, since the drill bit is too long and has poor rigidity, the drill tip will swing due to centrifugal force, and the tool swings greatly. When idling, the tool swings often reaches several millimeters. When entering the hole again, the position will be deviated, so the position accuracy is difficult to guarantee, and the hole diameter of the part will be too large and out of tolerance. In severe cases, there will be quality problems such as drill bit breakage, and the processing efficiency is low. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for processing manifold deep holes. This method reduces the length of the spiral groove, strengthens the rigidity of the tool, increases the cutting depth each time, and improves processing efficiency by more than 60%. The quality problem of drill bit breakage does not occur during processing. Due to the auxiliary block chip removal, the problems of drill bit swing and poor chip removal are effectively avoided, and the hole diameter does not exceed the tolerance. The processing quality is stable and reliable. The heat dissipation effect of the drill bit is improved by designing auxiliary holes. The qualified rate of deep holes in the parts processed by this method reaches more than 98%, and the rate of deviation, rework, and scrap is greatly reduced. The positioning accuracy of the deep holes processed by this method can be guaranteed to be greater than 0.1 mm, which can meet the design requirements of aviation parts manifolds.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for processing a manifold deep hole comprises the following steps:

[0007] Step S1: When processing the manifold parts, a process auxiliary block (2) is reserved at the end of the manifold, and the axial length of the auxiliary block is L;

[0008] Step S2: Use an alloy drill to drill a guide hole with a depth of 10D and a diameter of D±0.02mm, where D is the diameter of the manifold deep hole (1);

[0009] Step S3: milling a chip groove (3) on the peripheral wall of the auxiliary block (2), wherein the axial width of the chip groove is W and the radial depth of the chip groove is H; drilling an auxiliary hole (4) on the basis of the guide hole in the auxiliary block segment, wherein the diameter of the auxiliary hole is D1, H is the depth from the inner wall of the auxiliary hole to the bottom of the chip groove, and the radial depth H of the chip groove is 1 / 4D1-1 / 2D1, and D1>D;

[0010] Step S4: Replace the alloy drill with a spiral groove length of only 8-12 times the drill diameter. Before replacement, the static rotation diameter and runout of the alloy drill need to be measured on the tool setting instrument to control the runout of the long drill to be no more than 0.1mm.

[0011] Step S5: Use a low speed of 30 to 50 rpm to enter the pilot hole to prevent the long drill bit from swinging and causing the drill tip to deviate from the hole center. When there is a predetermined safety distance from the machining allowance, increase the speed to the machining speed;

[0012] Step S6: The predetermined depth of each pecking drill is 1-2 times of the diameter of the long drill bit, and deep hole processing is performed. Each time the drill bit is withdrawn to remove chips, the drill bit is withdrawn to between the chip groove (3) and the hole surface (5) of the auxiliary block (2), ensuring that the drill bit does not completely withdraw from the auxiliary hole (4). When the drill bit is withdrawn, aluminum chips are discharged from the chip groove and the drill bit is cooled. The heat dissipation effect of the drill bit is improved by designing the auxiliary hole. The cycle is repeated until the target depth of the manifold deep hole is processed;

[0013] Step S7: cutting off the reserved process auxiliary block (2).

[0014] Furthermore, the axial length of the auxiliary hole (4) is smaller than the axial length of the auxiliary block (2), and D1=(1.2-1.5)D.

[0015] Furthermore, L=(4-6)D, W=(1.5-2.5)D, and H=(1 / 4—1 / 2)D.

[0016] Furthermore, the manifold deep hole has a diameter D=3 mm and a depth of more than 135 mm, the auxiliary block (2) has a length L of about 15 mm, the chip groove (3) has a width W of about 6 mm, the chip groove depth H is about 1.2 mm, and the auxiliary hole (4) has a diameter D1=3.5-4 mm.

[0017] The present invention provides a method for processing manifold deep holes. This method reduces the length of the spiral groove, strengthens the rigidity of the tool, increases the cutting depth each time, and improves processing efficiency by more than 60%. The quality problem of drill bit breakage does not occur during processing. Due to the auxiliary block chip removal, the problems of drill bit swing and poor chip removal are effectively avoided, and the hole diameter does not exceed the tolerance. The processing quality is stable and reliable. The heat dissipation effect of the drill bit is improved by designing auxiliary holes. The qualified rate of deep holes in the parts processed by this method reaches more than 98%, and the rate of exceeding the tolerance, rework, and scrap is greatly reduced. The positioning accuracy of the deep holes processed by this method can be guaranteed to be more than 0.1 mm, which can meet the design requirements of aviation parts manifolds. It can be extended to other similar deep hole processing and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the auxiliary block structure of the method for processing the manifold deep hole of the present invention;

[0019] Figure 2 This is a schematic diagram of the auxiliary block structure of the method for processing the manifold deep hole of the present invention.

[0020] In the figure: manifold deep hole 1, auxiliary block 2, chip groove 3, auxiliary hole 4, hole mouth surface 5. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] The present invention will be described in further detail below with reference to the accompanying drawings.

[0023] like Figure 1-2 As shown, a method for processing a manifold deep hole includes the following steps:

[0024] Step S1: When processing the manifold parts, a process auxiliary block 2 is reserved at the end of the manifold, and the axial length of the auxiliary block is L;

[0025] Step S2: Use an alloy drill to drill a guide hole with a depth of 10D and a diameter of D±0.02mm, where D is the diameter of the manifold deep hole 1;

[0026] Step S3: milling a chip groove 3 on the outer peripheral wall of the auxiliary block 2, the axial width of the chip groove is W, and the radial depth of the chip groove is H; drilling an auxiliary hole 4 on the basis of the guide hole in the auxiliary block segment, the diameter of the auxiliary hole 4 is D1, H is the depth from the inner wall of the auxiliary hole 4 to the bottom of the chip groove, the radial depth H of the chip groove is 1 / 4D1-1 / 2D1, and D1>D;

[0027] Step S4: Replace the alloy drill with a spiral groove length of only 8-12 times the drill diameter. Before replacement, the static rotation diameter and runout of the alloy drill need to be measured on the tool setting instrument to control the runout of the long drill to be no more than 0.1mm.

[0028] Step S5: Use a low speed of 30 to 50 rpm to enter the pilot hole to prevent the long drill bit from swinging and causing the drill tip to deviate from the hole center. When there is a predetermined safety distance from the machining allowance, increase the speed to the machining speed;

[0029] Step S6: Each pecking drill is performed to a predetermined depth of 1-2 times the diameter of the long drill bit, and deep hole processing is performed. Each time the drill is withdrawn for chip removal, the drill bit is withdrawn to between the chip groove 3 and the hole surface 5 of the auxiliary block 2 to ensure that the drill bit does not completely withdraw from the auxiliary hole 4. When the drill is withdrawn, aluminum chips will be discharged from the chip groove 3 and the drill bit will be cooled. The heat dissipation effect of the drill bit is improved by designing the auxiliary hole 4. The cycle is repeated until the target depth of the manifold deep hole is processed;

[0030] Step S7: cutting off the reserved process auxiliary block 2.

[0031] The axial length of the auxiliary hole 4 is smaller than that of the auxiliary block 2, and D1=(1.2-1.5)D.

[0032] L = (4-6) D, preferably 5 times; W = (1.5-2.5) D, preferably 2 times; H = (1 / 4-1 / 2) D1, preferably 1 / 3 times.

[0033] In a specific embodiment, the manifold deep hole has a diameter D=3 mm and a depth of 135 mm or more, the auxiliary block 2 has a length L of about 15 mm, the chip groove 3 has a width W of about 6 mm, the chip groove 3 has a depth H of about 1.2 mm, and the auxiliary hole 4 has a diameter D1 of 3.5-4 mm.

[0034] To ensure tool rigidity and reduce the depth of the spiral chip flute, the length of the spiral chip flute only needs to be 8-12 times the drill diameter.

[0035] The present invention provides a method for processing manifold deep holes. This method reduces the length of the spiral groove, strengthens the rigidity of the tool, increases the cutting depth each time, and improves processing efficiency by more than 60%. The quality problem of drill bit breakage does not occur during processing. Due to the auxiliary block chip removal, the problems of drill bit swing and poor chip removal are effectively avoided, and the hole diameter does not exceed the tolerance. The processing quality is stable and reliable. The heat dissipation effect of the drill bit is improved by designing auxiliary holes. The qualified rate of deep holes in the parts processed by this method reaches more than 98%, and the rate of exceeding the tolerance, rework, and scrap is greatly reduced. The positioning accuracy of the deep holes processed by this method can be guaranteed to be more than 0.1 mm, which can meet the design requirements of aviation parts manifolds. It can be extended to other similar deep hole processing and has broad application prospects.

[0036] The above-mentioned embodiments are illustrative of the present invention, not limiting thereof. It is understood that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for processing a manifold deep hole, comprising the following steps: Step S1: When processing the manifold parts, a process auxiliary block (2) is reserved at the end of the manifold, and the axial length of the auxiliary block is L; Step S2: Use an alloy drill to drill a guide hole with a depth of 10D and a diameter of D±0.02mm, where D is the diameter of the manifold deep hole (1); Step S3: milling a chip groove (3) on the peripheral wall of the auxiliary block (2), wherein the axial width of the chip groove is W and the radial depth of the chip groove is H; drilling an auxiliary hole (4) on the basis of the guide hole in the auxiliary block segment, wherein the diameter of the auxiliary hole is D1, H is the depth from the inner wall of the auxiliary hole to the bottom of the chip groove, and the radial depth H of the chip groove is 1 / 4D1-1 / 2D1, and D1>D; Step S4: Replace the alloy drill with a spiral groove length of only 8-12 times the drill diameter. Before replacement, the static rotation diameter and runout of the alloy drill need to be measured on the tool setting instrument to control the runout of the long drill to be no more than 0.1mm. Step S5: Use a low speed of 30 to 50 rpm to enter the pilot hole to prevent the long drill bit from swinging and causing the drill tip to deviate from the hole center. When there is a predetermined safety distance from the machining allowance, increase the speed to the machining speed; Step S6: The predetermined depth of each pecking drill is 1-2 times of the diameter of the long drill bit, and deep hole processing is performed. Each time the drill bit is withdrawn to remove chips, the drill bit is withdrawn to between the chip groove (3) and the hole surface (5) of the auxiliary block (2), ensuring that the drill bit does not completely withdraw from the auxiliary hole (4). When the drill bit is withdrawn, aluminum chips are discharged from the chip groove and the drill bit is cooled. The heat dissipation effect of the drill bit is improved by designing the auxiliary hole. The cycle is repeated until the target depth of the manifold deep hole is processed; Step S7: cutting off the reserved process auxiliary block (2).

2. A method for processing a manifold deep hole according to claim 1, characterized in that: The axial length of the auxiliary hole (4) is smaller than the axial length of the auxiliary block (2), and D1=(1.2-1.5)D.

3. A method for processing a manifold deep hole according to claim 2, characterized in that: The L=(4-6)D, W=(1.5-2.5)D, and H=(1 / 4—1 / 2)D.

4. A method for processing a manifold deep hole according to claim 3, characterized in that: The manifold deep hole has a diameter D=3 mm and a depth of more than 135 mm. The auxiliary block (2) has a length L of about 15 mm, a chip groove (3) has a width W of about 6 mm, a chip groove depth H of about 1.2 mm, and an auxiliary hole (4) has a diameter D1 of 3.5-4 mm.

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