A method for machining a spindle step hole with a window

Abstract

The present invention discloses a spindle step hole processing method with a window, which belongs to the field of deep hole processing. The design structure of the spindle step hole and the window is analyzed, and the chip removal path of the deep hole boring machine is optimized in combination with the design of the boring head; a combined step boring head is designed and customized; the step hole is roughly bored in steps by using the boring head; the window is roughly milled to release stress in advance; the outer circle is repaired to make the outer circle step hole coaxial; the step hole is finely bored and the coaxiality is detected by using a coaxial mandrel; the window is finely milled, and the step hole enlarged by the coaxial mandrel is again used for coaxiality detection. The present invention adopts the above-mentioned spindle step hole processing method with a window, which ensures the quality of the step hole, reduces the influence of the window penetration on the coaxiality and sealing of the step hole, reduces the rework rate, improves the processing efficiency, reduces the processing cost, and solves the problems of easy deformation, low processing efficiency, and low product qualification rate of the existing processing method.

Description

Technical Field

[0001] The invention relates to the technical field of deep hole processing, in particular to a method for processing a spindle step hole with a window. Background Art

[0002] Oil and natural gas are two major energy sources that people cannot live without. They are stored in various complex geological environments, so it is necessary to survey, drill and exploit the two energy sources. Among them, the downhole equipment for oil and natural gas survey, drilling and exploitation: the spindle transmits the huge torque of the drill bit, and also acts as a shell to protect the various downhole measurement feedback electronic components loaded inside. Therefore, the internal structure of the spindle is usually designed as a multi-step structure, and the aperture, dimensional accuracy and coaxiality requirements of the step hole are very strict and precise to ensure the sealing, stability and anti-interference performance of the measurement instrument in the high temperature, high pressure and high corrosion environment underground. The outside of the spindle is usually designed with a window that penetrates the inner hole as a plug-in installation port for data transmission, collection, etc.

[0003] Currently, boring and drilling processes are generally performed with the help of boring machines. However, the existing boring machine chip removal method is not easy to remove chips due to the large difference in the diameter of the inner hole step, so that the waste chips generated during the boring process accumulate inside the step hole, affecting the further processing efficiency and product quality; and the milling outer circle window and the inner hole step hole are connected, which can easily cause the outer circle and inner hole of the workpiece to deform, resulting in coaxial deviation of the inner hole step. Summary of the invention

[0004] The purpose of the invention is to provide a method for machining a spindle step hole with a window, so as to solve the problems of easy deformation, low machining efficiency and low product qualification rate in the existing machining method.

[0005] To achieve the above object, the present invention provides a method for machining a spindle step hole with a window, comprising the following steps:

[0006] Step S1: Analyze the design structure of the spindle step hole and the window, and optimize the chip removal path of the deep hole boring machine in combination with the design of the boring head;

[0007] Step S2: designing and customizing the required combined step boring head;

[0008] Step S3: Rough boring the step hole in steps using a boring head;

[0009] Step S4: Rough milling the window to release stress in advance;

[0010] Step S5: repair the outer circle to make the outer circle and inner hole coaxial;

[0011] Step S6: precision boring the inner hole and using a coaxial mandrel to detect its coaxiality;

[0012] Step S7: Finish milling the window, and use the coaxial mandrel to enlarge the stepped hole for coaxiality inspection again.

[0013] Preferably, in step S1, the chip removal path of the deep hole boring machine is optimized by adding a chip removal groove at the large hole end, reducing the diameter of the boring head, increasing the gap between the boring head and the step hole, and improving chip blocking of the step hole.

[0014] Preferably, in step S2, specifically a φ55mm / φ98mm combined step boring head is customized, and a φ35mm deep hole drill, a φ35mm deep hole boring head, a φ45mm deep hole boring head, a φ55mm adjustable floating knife, a φ98mm adjustable floating knife, a flat bottom knife and a root cleaning knife are also customized.

[0015] Preferably, step S3 mainly includes:

[0016] Step S31: Use a φ35mm deep hole drill bit to drill a step hole of φ35mm, and use a φ35mm deep hole boring head to fine bore the step hole of φ35mm to φ40mm;

[0017] Step S32: Use the φ35mm deep hole boring head and the φ45mm deep hole boring head to rough bore the step hole from φ40mm to φ52mm in steps, and use the φ55mm deep hole boring head in the combined step boring head and the existing boring head to rough bore the step hole from φ52mm to φ95mm in steps.

[0018] Preferably, in step S4, the window is rough milled to remove most of the milling allowance and release the stress before fine boring of the step hole;

[0019] Preferably, step S6 specifically includes:

[0020] Step S61: using a φ98 mm deep hole boring head in the combined boring head to enlarge the stepped hole from φ95 mm to φ98 mm;

[0021] Step S62: using a flat bottom knife to flatten the end surface of the stepped hole φ98 mm, and using a root cleaning knife to clean the bottom of the stepped hole φ98 mm;

[0022] Step S63: The combined step boring head φ55mm / φ98mm is used to finely bore the step hole φ52mm with the φ98mm deep hole boring head as a guide, and the step hole φ52mm is expanded to φ55mm;

[0023] Step S64: using a φ98 mm deep hole boring head and using the φ98 mm deep hole boring head as a guide, expanding the stepped hole φ98 mm to φ100 mm;

[0024] Step S65: Use a coaxial mandrel to perform coaxiality detection on the φ55 mm step hole, φ98 mm step hole, and φ100 mm step hole.

[0025] Therefore, the present invention adopts the above-mentioned spindle step hole processing method with a window, which has the following characteristics:

[0026] Beneficial effects:

[0027] (1) First, due to the large difference in the diameter of the step hole, it is not easy to remove chips from the φ40 through hole of the workpiece when machining a large hole. By optimizing the chip removal path of the deep hole boring machine, increasing chip removal from the large hole end, reducing the diameter of the boring head, adding chip removal grooves, and increasing the gap between the boring head and the inner hole, the chip removal of the step hole is improved;

[0028] (2) Rough milling of the window (not connected with the step hole), aging release of stress, milling of most of the window allowance, release of stress before fine boring of the step hole, and reduction of the influence of deformation on the step hole when the fine milling window is connected;

[0029] (3) Using the φ98mm hole as a guide, use the combined step boring head to finely bore the φ55mm and φ100mm step holes. The combined boring head can be assembled together as a step boring head or disassembled and used separately. Use a coaxial mandrel to perform coaxiality inspection on φ55mm / φ98mm / φ100mm;

[0030] (4) The step hole with a window prepared by the processing method described in the present invention ensures the quality of the step hole, reduces the impact of the window penetration on the coaxiality and sealing of the step hole, reduces the rework rate, improves the processing efficiency, and reduces the processing cost.

[0031] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of an embodiment of a method for machining a spindle step hole with a window according to the present invention;

[0033] Figure 2 A schematic diagram of a combined boring head according to an embodiment of a spindle step hole machining method with a window according to the present invention;

[0034] Figure 3 A schematic diagram of the external thread at the tail of a boring head A in an embodiment of a method for machining a spindle step hole with a window according to the present invention;

[0035] Figure 4 A schematic diagram of an internal threaded hole at the top of a boring head B in an embodiment of a spindle step hole machining method with a window according to the present invention;

[0036] Figure 5 A schematic diagram of the cross-sectional structure of a spindle according to an embodiment of a method for machining a spindle step hole with a window of the present invention;

[0037] Reference numerals

[0038] 1. Boring head A; 2. Boring head B; 3. External thread; 4. Internal thread hole; 5. Window. DETAILED DESCRIPTION

[0039] Example

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] To achieve the above purpose, the present invention adopts the following technical scheme (see flow chart Figure 1 ):

[0042] S1. On the basis of ensuring the rigidity of the boring head, the design structure of the spindle step hole and window 5 is analyzed in combination with the design of the boring head. The chip removal path of the deep hole boring machine is optimized by adding a chip groove at the large hole end, reducing the diameter of the boring head, increasing the gap between the boring head and the step hole, and improving the chip blockage of the step hole.

[0043] S2. Design and customize the required deep hole drill, deep hole boring head, combined step boring head, matching floating cutter, flat bottom cutter, and root cleaning cutter. The specific specifications are φ35mm deep hole drill, φ35mm deep hole boring head, φ45mm deep hole boring head, φ55mm / φ98mm combined step boring head, φ55mm adjustable floating cutter, and φ98mm adjustable floating cutter.

[0044] Combined step boring head Figure 2 , the external thread 3 ( Figure 3 ) and the internal threaded hole 4 ( Figure 4 ) corresponding connection, can be disassembled and used separately, and can also be connected together to be used as a step boring head.

[0045] S3. Use a φ35mm deep hole drill to drill a φ35mm step hole, and use a φ35mm deep hole boring head to fine-bored the step hole from φ35mm to φ40mm; then use φ35mm and φ45mm deep hole boring heads to rough-bored the step hole from φ40mm to φ52mm in steps, and use the φ55mm deep hole boring head in the combined step boring head and the existing boring head to rough-bored the step hole from φ52mm to φ95mm in steps. The depth of the step hole after rough boring is slightly smaller than the depth of the step hole after fine boring.

[0046] S4, rough milling window 5 (not connected with the step hole), remove most of the excess, and release the stress in advance before fine boring of the step hole.

[0047] S5. Repair the outer circle with the diameter of the φ40mm step hole as the standard, ensure that the outer circle step hole is coaxial, remove the deformation caused by the rough milling window 5, and avoid affecting the workpiece.

[0048] S6. Use the φ98mm deep hole boring head in the combined boring head to enlarge the step hole from φ95mm to φ98mm, use a flat-bottomed cutter to flatten the end face of the step hole, and use a root cleaning cutter to clean the bottom of the φ98mm step hole; use the combined step boring head φ55mm / φ98mm, use the inner hole of the φ98mm boring head as a guide to perform fine boring on the φ52mm step hole, and expand the φ52mm step hole to φ55mm; disassemble the step boring head, use the φ98mm boring head, use the inner hole of the φ98mm boring head as a guide, adjust the tool, and expand the φ98mm step hole to φ100mm, see Figure 5 ; Use a coaxial mandrel to detect the coaxiality of φ55mm step holes, φ98mm step holes, and φ100mm step holes.

[0049] S7. Fine-mill window 5 until it is connected with the step hole, remove the burrs at the intersection, and use the coaxial mandrel again to test the coaxiality of the φ55mm step hole, φ98mm step hole, and φ100mm step hole to confirm whether the connection between window 5 and the step hole affects the coaxiality of the step hole.

[0050] Therefore, the present invention adopts the above-mentioned spindle step hole processing method with a window, which ensures the quality of the step hole, reduces the influence of the window penetration on the coaxiality and sealing of the step hole, reduces the rework rate, improves the processing efficiency, reduces the processing cost, and solves the problems of easy deformation, low processing efficiency and low product qualification rate of the existing processing method.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for machining a spindle step hole with a window, characterized in that: The following steps are involved: Step S1: Analyze the design structure of the spindle step hole and the window, and optimize the chip removal path of the deep hole boring machine in combination with the design of the boring head; Step S2: designing and customizing a combined step boring head; Specifically, it is customized φ55mm / φ98mm combined step boring head, customized φ35mm deep hole drill, φ35mm deep hole boring head, φ45mm deep hole boring head, φ55mm adjustable floating knife, φ98mm adjustable floating knife, flat bottom knife and root cleaning knife; Step S3: Rough boring the step hole in steps using a boring head; Step S31: Use a φ35mm deep hole drill bit to drill a step hole of φ35mm, and use a φ35mm deep hole boring head to fine bore the step hole of φ35mm to φ40mm; Step S32: Use a φ35mm deep hole boring head and a φ45mm deep hole boring head to rough bore the step hole φ40mm to φ52mm in steps, and use a φ55mm deep hole boring head in the combined step boring head and an existing boring head to rough bore the step hole φ52mm to φ95mm in steps; Step S4: Rough milling the window to release stress in advance; Step S5: Repair the outer circle to make the outer circle step hole coaxial; Step S6: precision boring the step hole and using a coaxial mandrel to detect its coaxiality; Specifically include: Step S61: using a φ98 mm deep hole boring head in a combined step boring head to enlarge the step hole from φ95 mm to φ98 mm; Step S62: using a flat bottom knife to flatten the end surface of the stepped hole φ98 mm, and using a root cleaning knife to clean the bottom of the stepped hole φ98 mm; Step S63: using a φ55mm / φ98mm combined step boring head, using the φ98mm step hole as a guide, to perform precision boring on the φ52mm step hole, and expanding the φ52mm step hole to φ55mm; Step S64: disassemble the step boring head, use a φ98 mm deep hole boring head, and use the φ98 mm step hole as a guide to expand the step hole φ98 mm to φ100 mm; Step S65: Use a coaxial mandrel to perform coaxiality detection on the φ55 mm step hole, the φ98 mm step hole, and the φ100 mm step hole; Step S7: Finish milling the window, and use the coaxial mandrel again to perform coaxiality inspection on the enlarged step hole.

2. A method for machining a spindle step hole with a window according to claim 1, characterized in that: In step S1, the chip removal path of the deep hole boring machine is optimized by adding a chip removal groove at the large hole end, reducing the diameter of the boring head, and increasing the gap between the boring head and the step hole.

3. The method for machining a spindle step hole with a window according to claim 1, characterized in that: In step S4, the window is rough milled to remove the milling allowance, and the stress is released before the step hole is finely bored.

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