Machining method for end cap valve hole

Abstract

This disclosure provides a method for machining an end cap valve hole, belonging to the field of hydraulic cylinder technology. The machining method includes: forming an initial hole on the outer peripheral wall of the end cap, extending the initial hole to the inner hole of the end cap; forming a first stepped hole coaxial with the initial hole on the outer peripheral wall of the end cap, using the central axis of the initial hole as a reference, the minimum diameter of the first stepped hole being larger than the diameter of the initial hole; forming a second stepped hole coaxial with the initial hole on the bottom surface of the first stepped hole, using the central axis of the initial hole as a reference, the second stepped hole extending from the bottom surface of the first stepped hole to the inner hole of the end cap, the maximum diameter of the second stepped hole being smaller than the minimum diameter of the first stepped hole, and the minimum diameter of the second stepped hole being larger than the diameter of the initial hole; machining internal threads on at least a portion of the hole wall of the second stepped hole to obtain the end cap valve hole. This disclosure reduces machining difficulty and improves the machining efficiency of the end cap valve hole.

Description

Technical Field

[0001] This disclosure relates to the field of hydraulic cylinder technology, and in particular to a method for machining an end cap valve hole. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. Hydraulic cylinders have a simple structure and smooth operation, and are widely used in the hydraulic systems of various machines.

[0003] In related technologies, hydraulic cylinders typically include a cylinder barrel, a piston, an end cap, and a piston rod. The end cap is mounted at one end of the cylinder barrel, the piston is slidably fitted inside the cylinder barrel, and the piston rod passes through the end cap and connects to the piston. The piston divides the interior of the cylinder barrel into two chambers. Under the oil pressure of the two chambers, the piston slides along the cylinder barrel, driving the piston rod to perform linear reciprocating motion. A valve hole, penetrating the end cap, is usually provided on the outer peripheral wall of the end cap for installing a throttle valve.

[0004] Because the valve hole is a stepped hole with small dimensional tolerances, deep internal threads, and many chamfers, it is difficult to process and has very low processing efficiency. Summary of the Invention

[0005] This disclosure provides a method for machining end cap valve holes, which can reduce machining difficulty and improve machining efficiency. The technical solution is as follows:

[0006] This disclosure provides a method for processing an end cap valve hole. The method includes: forming an initial hole on the outer peripheral wall of the end cap, extending the initial hole to the inner hole of the end cap; forming a first stepped hole coaxial with the initial hole on the outer peripheral wall of the end cap, with the central axis of the initial hole as a reference, wherein the minimum diameter of the first stepped hole is larger than the diameter of the initial hole; forming a second stepped hole coaxial with the initial hole on the bottom surface of the first stepped hole, with the central axis of the initial hole as a reference, extending from the bottom surface of the first stepped hole to the inner hole of the end cap, wherein the maximum diameter of the second stepped hole is smaller than the minimum diameter of the first stepped hole, and the minimum diameter of the second stepped hole is larger than the diameter of the initial hole; and processing internal threads on at least a portion of the hole wall of the second stepped hole to obtain the end cap valve hole.

[0007] In one implementation of this disclosure, forming a first stepped hole coaxial with the initial hole on the outer peripheral wall of the end cap includes: forming a first recessed hole on the outer peripheral wall of the end cap, and forming a second recessed hole on the bottom surface of the first recessed hole to obtain the first stepped hole. The first recessed hole and the second recessed hole are coaxial, and the diameter of the first recessed hole is larger than the diameter of the second recessed hole.

[0008] In another implementation of the present disclosure, forming a second stepped hole coaxial with the initial hole on the bottom surface of the first stepped hole includes: forming a third, fourth, fifth, and sixth concave hole coaxially connected in sequence on the bottom surface of the second concave hole using a stepped drill, thereby obtaining the second stepped hole, wherein the diameters of the third, fourth, fifth, and sixth concave holes decrease sequentially.

[0009] In another implementation of the present disclosure, machining an internal thread on at least a portion of the hole wall of the second stepped hole includes: tapping the inner wall of the fourth concave hole to machine the fourth concave hole into a threaded hole, thereby obtaining the end cap valve hole.

[0010] In another implementation of the present disclosure, after forming a second stepped hole coaxial with the initial hole on the bottom surface of the first stepped hole, the method further includes: using a stepped reamer to finish the second stepped hole.

[0011] In another implementation of this disclosure, before forming the initial hole on the outer peripheral wall of the end cap, the method further includes: milling a processing area on the outer peripheral wall of the end cap, the processing area being used to process the initial hole, and the minimum width of the processing area being greater than the maximum diameter of the first stepped hole.

[0012] In another implementation of the present disclosure, forming an initial hole on the outer peripheral wall of the end cap includes adding coolant to the processing area while processing the initial hole in the processing area.

[0013] In another implementation of the present disclosure, the processing method further includes: when processing the first stepped hole and the second stepped hole, using a suction device to suck up iron filings from one end of the initial hole located in the inner hole of the end cap.

[0014] In another implementation of the present disclosure, the suction device includes a vacuum pump and a suction box, the inner cavity of the suction box is connected to the suction port of the vacuum pump, and the first end face of the suction box has a through suction port.

[0015] In another implementation of this disclosure, the suction device further includes a controller, an electromagnet, and a drive unit. The controller is electrically connected to the electromagnet, the drive unit, and the vacuum pump. The electromagnet is located on the first end face and is spaced apart from the suction port. The drive unit is connected to the suction box and is used to drive the suction box to move closer to or away from the end cap valve hole along the axial direction of the end cap valve hole. The controller is used to control the electromagnet to be energized when the drive unit drives the suction box closer to the end cap valve hole, and to control the electromagnet to be de-energized when the drive unit drives the suction box away from the end cap valve hole, and to control the vacuum pump to operate.

[0016] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0017] The end cap valve hole processing method provided in this embodiment firstly forms an initial hole on the outer peripheral wall of the end cap. Since the initial hole extends from the outer peripheral wall of the end cap to the inner hole of the end cap, processing the first stepped hole and the second stepped hole based on the initial hole not only allows for further processing based on the initial hole, reducing processing difficulty, but also makes it easier to keep the first stepped hole and the second stepped hole coaxial, thereby improving processing accuracy. Moreover, the initial hole extending through the end cap allows for the removal of iron filings generated during the processing of the first stepped hole and the second stepped hole, preventing excessive iron filings from accumulating and affecting subsequent drilling, thus reducing processing difficulty and improving the processing efficiency of the end cap valve hole.

[0018] Simultaneously, before machining the second-step hole, the first-step hole is machined first to widen the initial hole size, providing sufficient space to easily insert the drill bit for drilling the second-step hole. This way, when machining the second-step hole, since the first-step hole has already drilled down a portion of the end cap, the drill bit can directly drill through the end cap, avoiding the need for multiple drilling passes, reducing the number of drilling operations, and improving drilling efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an end cap provided in an embodiment of this disclosure;

[0021] Figure 2 yes Figure 1 An AA cross-sectional view is provided;

[0022] Figure 3 This is a flowchart of a method for processing an end cap valve hole according to an embodiment of this disclosure;

[0023] Figure 4 This is a flowchart of another method for processing an end cap valve hole provided in an embodiment of this disclosure;

[0024] Figure 5 This is a state diagram of a step drilling roughing valve hole provided in an embodiment of this disclosure;

[0025] Figure 6This is a schematic diagram of a step drill provided in an embodiment of this disclosure;

[0026] Figure 7 This is a state diagram of a stepped reamer used for finishing an inner hole, provided in an embodiment of this disclosure;

[0027] Figure 8 This is a schematic diagram of a stepped reamer provided in an embodiment of this disclosure;

[0028] Figure 9 This is a schematic diagram of a suction device provided in an embodiment of this disclosure.

[0029] The markings in the diagram are explained as follows:

[0030] 10. End cap; 11. Inner hole; 12. Valve hole;

[0031] 30. First stepped hole; 31. First recessed hole; 32. Second recessed hole;

[0032] 40. Second step hole; 41. Third recessed hole; 42. Fourth recessed hole; 43. Fifth recessed hole; 44. Sixth recessed hole;

[0033] 51. Vacuum pump; 52. Suction box; 521. Suction port; 53. Controller; 54. Electromagnet; 55. Drive component;

[0034] 61. Step drill bit; 611. First drill bit; 612. Second drill bit; 613. Third drill bit; 614. Fourth drill bit;

[0035] 62. Stepped reamer; 621. First reamer; 622. Second reamer; 623. Third reamer. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings. 1

[0037] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” “top,” and “bottom,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0038] Figure 1 This is a schematic diagram of the structure of an end cap provided in an embodiment of this disclosure. For example... Figure 1 As shown, the end cap 10 is an annular structure with an inner hole 11. The end cap 10 is typically fitted onto the piston rod through the inner hole 11, and one end of the end cap 10 is fixed to one end of the cylinder. The outer peripheral wall of the end cap 10 is provided with a valve hole 12 extending to the inner hole 11. The valve hole 12 is used to install a throttle valve to control the oil injected into the cylinder cavity.

[0039] Figure 2 yes Figure 1 An AA cross-sectional view is provided. For example... Figure 2 As shown, the valve hole 12 is a stepped hole, and an internal thread is machined on a portion of the inner hole 11 of the stepped hole. Therefore, machining the valve hole on the end cap is difficult and inefficient.

[0040] Therefore, this disclosure provides a method for processing an end cap valve hole. Figure 3 This is a flowchart illustrating a method for processing an end cap valve hole according to an embodiment of this disclosure. Figure 3 As shown, the processing method includes:

[0041] Step 101: Form an initial hole on the outer peripheral wall of the end cap 10, so that the initial hole extends to the inner hole 11 of the end cap 10.

[0042] Step 102: Using the central axis of the initial hole as a reference, form a first stepped hole 30 on the outer peripheral wall of the end cap 10, which is coaxial with the initial hole.

[0043] The minimum diameter of the first stepped hole 30 is greater than the diameter of the initial hole.

[0044] Step 103: Using the central axis of the initial hole as a reference, form a second stepped hole 40 that is coaxial with the initial hole on the bottom surface of the first stepped hole 30.

[0045] The second stepped hole 40 extends from the bottom surface of the first stepped hole 30 to the inner hole 11 of the end cap 10. The maximum diameter of the second stepped hole 40 is smaller than the minimum diameter of the first stepped hole 30, and the minimum diameter of the second stepped hole 40 is larger than the diameter of the initial hole.

[0046] Step 104: Machine internal threads on at least a portion of the bore wall of the second stepped bore 40 to obtain the end cap valve bore.

[0047] The end cap valve hole processing method provided in this embodiment firstly forms an initial hole on the outer peripheral wall of the end cap 10. Since the initial hole extends from the outer peripheral wall of the end cap 10 to the inner hole 11 of the end cap 10, when processing the first stepped hole 30 and the second stepped hole 40 based on the initial hole, it is not only possible to further process based on the initial hole, reducing the processing difficulty, but also easier to keep the processed first stepped hole 30 and second stepped hole 40 coaxial, thereby improving processing accuracy. Moreover, the iron filings generated during the processing of the first stepped hole 30 and the second stepped hole 40 can be discharged through the initial hole that extends through the end cap 10, avoiding the accumulation of too many iron filings that would affect subsequent drilling, thus reducing processing difficulty and improving the processing efficiency of the end cap valve hole.

[0048] Simultaneously, before machining the second stepped hole 40, the first stepped hole 30 is machined first to widen the initial hole size, providing sufficient space to easily insert the drill bit for drilling the second stepped hole 40. Thus, when machining the second stepped hole 40, since the first stepped hole 30 has already drilled down a portion of the end cap 10, the drill bit can directly drill through the end cap 10, avoiding the need for multiple drilling operations, reducing the number of drilling operations, and improving drilling efficiency.

[0049] Figure 4 This is a flowchart illustrating another method for processing the end cap valve hole provided in this embodiment of the disclosure. Figure 4 As shown, the processing method includes:

[0050] Step 201: Mill the machining area on the outer peripheral wall of the flat end cap 10.

[0051] The machining area is used to machine the initial hole. Since the outer peripheral wall of the end cap 10 is curved, milling the outer peripheral wall of the end cap 10 to form the machining area facilitates the machining of the valve hole on the plane, thereby improving the machining accuracy of the valve hole.

[0052] Optionally, the minimum width of the processing area is greater than the maximum diameter of the first stepped hole 30.

[0053] For example, the maximum diameter of the first stepped hole 30 can be 60 mm, and the minimum width of the processing area can be 70 mm.

[0054] Specifically, this may include: placing the end cover 10 flat on a boring machine, aligning the valve hole end face with the machine tool spindle, milling the area on the outer peripheral wall of the end cover 10 that needs to be drilled, and obtaining the machining area.

[0055] Step 202: Form an initial hole on the outer peripheral wall of the end cap 10, so that the initial hole extends to the inner hole 11 of the end cap 10.

[0056] Specifically, this may include: drilling through the end cap 10 with a drill bit, so that the initial hole extends from the outer peripheral wall of the end cap 10 to the inner hole 11 of the end cap 10.

[0057] Optionally, when machining the initial hole in the machining area, coolant can be added to the machining area to reduce the temperature of the drill bit and prevent it from overheating.

[0058] After the initial hole is machined, the minimum distance from the centerline of the initial hole to the end face of the end cap 10 must be controlled to a set value.

[0059] For example, the set value is greater than or equal to 30 mm. For instance, the set value is 33 mm. This is to avoid the valve hole being too close to the end face of the end cap 10, which would affect the strength of the valve hole.

[0060] In this embodiment of the disclosure, before drilling the valve hole, a smaller initial hole is first drilled to facilitate the removal of iron filings during subsequent drilling. During drilling, the drill bit should be lifted multiple times to remove chips, and high-pressure air should be used to blow away chips if necessary.

[0061] Step 203: Using the central axis of the initial hole as a reference, a first recessed hole 31 is formed on the outer peripheral wall of the end cap 10, and a second recessed hole 32 is formed on the bottom surface of the first recessed hole 31 to obtain the first stepped hole 30.

[0062] Among them, such as Figure 2 As shown, the first concave hole 31 and the second concave hole 32 are coaxial, and the diameter of the first concave hole 31 is larger than the diameter of the second concave hole 32.

[0063] For example, such as Figure 2 As shown, the diameter D1 of the first recess 31 is 55mm to 65mm. For example, the diameter of the first recess 31 is 60mm.

[0064] For example, such as Figure 2 As shown, the diameter D2 of the second recess 32 is 45mm to 55mm. For example, the diameter of the second recess 32 is 50mm.

[0065] This creates a larger first-step hole 30, widening the initial hole size and providing sufficient space to easily insert the drill bit for drilling the second-step hole 40. This allows the drill bit to easily penetrate the end cap 10 during the machining of the second-step hole 40, improving drilling efficiency.

[0066] Step 204: Using the central axis of the initial hole as a reference, a step drill 61 is used to form a third concave hole 41, a fourth concave hole 42, a fifth concave hole 43 and a sixth concave hole 44 that are coaxially connected in sequence on the bottom surface of the second concave hole 32, to obtain the second step hole 40.

[0067] like Figure 2 As shown, the diameters of the third recess 41, the fourth recess 42, the fifth recess 43, and the sixth recess 44 decrease sequentially.

[0068] Specifically, it can include, such as Figure 5 As shown, when roughing the valve hole 12 using a step drill 61 and correcting the inner hole 11, the tool should be lifted multiple times to remove chips during machining. Slow feed is used; as the drilling depth increases, the cutting edge contact area increases, and the cutting force increases. Slow feed can reduce tool wear and improve workpiece machining quality.

[0069] For example, the diameter D3 of the third recess 41 is 25 mm to 35 mm. For instance, the diameter of the third recess 41 is 30 mm.

[0070] For example, the diameter D4 of the fourth recess 42 is 23 mm to 26 mm. For instance, the diameter of the fourth recess 42 is 25 mm.

[0071] For example, the diameter D5 of the fifth recess 43 is 21 mm to 23 mm. For instance, the diameter of the fifth recess 43 is 22 mm.

[0072] For example, the diameter D6 of the sixth recess 44 is 18 mm to 22 mm. For instance, the diameter of the sixth recess 44 is 20 mm.

[0073] Figure 6 This is a schematic diagram of a step drill provided in an embodiment of this disclosure. Figure 6 As shown, the step drill 61 includes a first drill bit 611, a second drill bit 612, a third drill bit 613, and a fourth drill bit 614 connected coaxially in sequence.

[0074] In this process, a chamfer transition is used between two adjacent drill bits, so that the two adjacent concave holes in the second stepped hole 40 formed by machining are also connected by a chamfer transition.

[0075] The embodiments disclosed herein employ a step drill for direct drilling, which can process all three holes and chamfer dimensions of the second step hole 40, reducing the time spent on constant tool changes and measurements in conventional machining, and improving efficiency.

[0076] Optionally, the diameter of the first drill bit is 0.24 mm smaller than the diameter of the third recess 41, the diameter of the second drill bit is 0.24 mm smaller than the diameter of the fourth recess 42, the diameter of the third drill bit is 0.24 mm smaller than the diameter of the fifth recess 43, and the diameter of the fourth drill bit is 0.24 mm smaller than the diameter of the sixth recess 44, so as to leave sufficient allowance for subsequent finishing.

[0077] For example, the length L1 of the first drill bit 611 is 3 mm to 5 mm, for example, the length L1 of the first drill bit is 3.7 mm.

[0078] For example, the length L2 of the second drill bit 612 is 30 mm to 35 mm, for example, the length L2 of the second drill bit is 32 mm.

[0079] For example, the length L3 of the third drill bit 613 is 10 mm to 15 mm, for example, the length L3 of the third drill bit is 13 mm.

[0080] For example, the length L4 of the fourth drill bit 614 is 35mm to 45mm, for example, the length L4 of the fourth drill bit is 39mm.

[0081] Step 205: Use a stepped reamer 62 to finish the second stepped hole 40.

[0082] Specifically, this may include: such as Figure 7 As shown, the second step hole is finished by replacing the step reamer 62.

[0083] Figure 8 This is a schematic diagram of a stepped reamer provided in an embodiment of this disclosure. Figure 8 As shown, the stepped reamer 62 includes a first reamer 621, a second reamer 622, and a third reamer 623 that are coaxially connected in sequence.

[0084] In this process, a chamfer transition is used between two adjacent reamers, so that the two adjacent concave holes in the second stepped hole 40 formed by machining are also connected by a chamfer transition.

[0085] In this embodiment, a stepped reamer is used to finish the valve hole. The first reamer is used to finish the third concave hole 41, the second reamer is used to finish the fourth concave hole 42, and the third reamer is used to finish the fifth concave hole 43.

[0086] Among them, the sixth concave hole 44 in the second stepped hole 40 is a concave hole machined for discharging iron filings, so the sixth concave hole 44 does not need to be equipped with a reamer for finishing.

[0087] Optionally, the diameter of the first reamer is equal to the diameter of the third recess 41, the diameter of the second reamer is equal to the diameter of the fourth recess 42, and the diameter of the third reamer is equal to the diameter of the fifth recess 43.

[0088] For example, the length L5 of the first reamer 621 is 3mm to 5mm, for example, the length L5 of the first reamer is 4.75mm.

[0089] For example, the length L6 of the second reamer 622 is 25mm to 35mm, for example, the length L6 of the second reamer is 31mm.

[0090] For example, the length L7 of the third reamer 623 is 10mm to 15mm, for example, the length L7 of the third reamer is 13mm.

[0091] Step 206: Tap the inner wall of the fourth concave hole 42 to process the fourth concave hole 42 into a threaded hole, thus obtaining the end cap valve hole.

[0092] Specifically, this may include tapping the fourth recessed hole 42. Since the fourth recessed hole 42 is located deep from the outer peripheral wall of the end cap 10, an extended tap is used to tap the imperial thread.

[0093] For example, the axial length H of the tapping is 15 mm to 20 mm. For instance, the axial length of tapping on the outer peripheral wall is 17 mm.

[0094] In this embodiment of the present disclosure, when machining the first stepped hole 30 and the second stepped hole 40, a suction device can also be used to suction iron filings from one end of the initial hole located in the inner hole 11 of the end cap 10.

[0095] By removing iron filings from the initial hole using a suction device, the blockage of the initial hole by iron filings can be avoided, thus preventing the valve hole from becoming more difficult to process.

[0096] Figure 9 This is a schematic diagram of a suction device provided in an embodiment of this disclosure. Figure 9 As shown, the suction device includes a vacuum pump 51 and a suction box 52. The inner cavity of the suction box 52 is connected to the suction port of the vacuum pump 51, and the first end face of the suction box 52 has a through suction port 521.

[0097] The vacuum pump 51 can quickly remove the air from the suction box 52, thereby creating a certain degree of vacuum in the inner cavity of the suction box 52. This allows the suction box 52 to suck iron filings from the initial hole through the suction port 521 and store them there, preventing the iron filings from blocking the initial hole.

[0098] Optionally, such as Figure 9As shown, the suction device also includes: a controller 53, an electromagnet 54, and a drive unit 55. The controller 53 is electrically connected to the electromagnet 54, the drive unit 55, and the vacuum pump 51 respectively. The electromagnet 54 is located on the first end face and is arranged at intervals with the suction port. The drive unit 55 is connected to the suction box 52 and is used to drive the suction box 52 to move closer to or away from the end cover valve hole along the axial direction of the end cover valve hole.

[0099] In this embodiment of the present disclosure, the controller 53 is used to control the driving component 55 to drive the suction box 52 close to the end cover valve hole, control the electromagnet 54 to be energized, and control the driving component 55 to drive the suction box 52 away from the end cover valve hole, control the electromagnet 54 to be de-energized, and control the vacuum pump 51 to work.

[0100] For example, controller 53 is a programmable logic controller (PLC). A PLC is a programmable memory that stores instructions for performing logical operations, sequential control, timing, counting, and arithmetic operations, and controls the actions of various devices through digital or analog inputs and outputs.

[0101] For example, the drive unit 55 is an electric cylinder, one end of which is connected to the end face of the suction box 52 that is away from the first end face.

[0102] For example, an electromagnet is a device that generates electromagnetic fields when energized. The electromagnet 54 is magnetic when energized, and the magnetism disappears when the power is turned off.

[0103] In the above implementation, during the processing of the first stepped hole 30 and the second stepped hole 40, the controller 53 first controls the electric cylinder to drive the suction box 52 to approach the initial hole. Then, the controller 53 controls the electromagnet 54 to be energized, so that the electromagnet 54 becomes magnetic, thereby attracting the iron filings remaining in the initial hole to the electromagnet 54 through magnetism. Then, after the processing of the first stepped hole 30 and the second stepped hole 40 is completed, the controller controls the electric cylinder to drive the suction box 52 away from the initial hole. Then, the controller 53 controls the electromagnet 54 to be de-energized, so that the electromagnet 54 loses its magnetism. At the same time, the controller 53 controls the vacuum pump 51 to work, so that the suction hole can attract the iron filings attracted to the electromagnet 54 into the suction box, thereby completing the iron filings recycling work.

[0104] Using this method to recycle iron filings can avoid the problem of iron filings splashing when falling from the initial hole; at the same time, the iron filings are directly attracted to the electromagnet after falling, and the electromagnet 54 is installed on the first end face, and the electromagnet and the suction hole are arranged at intervals, that is, the distance between the electromagnet and the suction port 521 is relatively close, so as to ensure that even if the suction force at the location of the suction port 521 is small, the iron filings can be easily sucked into the suction box 52 for storage.

[0105] The end cap valve hole processing method provided in this embodiment firstly forms an initial hole on the outer peripheral wall of the end cap 10. Since the initial hole extends from the outer peripheral wall of the end cap 10 to the inner hole 11 of the end cap 10, when processing the first stepped hole 30 and the second stepped hole 40 based on the initial hole, it is not only possible to further process based on the initial hole, reducing the processing difficulty, but also easier to keep the processed first stepped hole 30 and second stepped hole 40 coaxial, thereby improving processing accuracy. Moreover, the iron filings generated during the processing of the first stepped hole 30 and the second stepped hole 40 can be discharged through the initial hole that extends through the end cap 10, avoiding the accumulation of too many iron filings that would affect subsequent drilling, thus reducing processing difficulty and improving the processing efficiency of the end cap valve hole.

[0106] The above is not intended to limit this disclosure in any way. Although this disclosure has been disclosed above through embodiments, it is not intended to limit this disclosure. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this disclosure. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this disclosure without departing from the content of the technical solution of this disclosure shall still fall within the scope of the technical solution of this disclosure.

Claims

1. A method for processing an end cap valve hole, characterized in that, The processing method includes: An initial hole is formed on the outer peripheral wall of the end cap, such that the initial hole extends into the inner hole of the end cap; Using the central axis of the initial hole as a reference, a first stepped hole coaxial with the initial hole is formed on the outer peripheral wall of the end cap, wherein the minimum diameter of the first stepped hole is larger than the diameter of the initial hole. With the central axis of the initial hole as a reference, a second stepped hole coaxial with the initial hole is formed on the bottom surface of the first stepped hole. The second stepped hole extends from the bottom surface of the first stepped hole to the inner hole of the end cap. The maximum diameter of the second stepped hole is smaller than the minimum diameter of the first stepped hole, and the minimum diameter of the second stepped hole is larger than the diameter of the initial hole. Internal threads are machined on at least a portion of the bore wall of the second stepped bore to obtain the end cap valve bore.

2. The processing method according to claim 1, characterized in that, Forming a first stepped hole coaxial with the initial hole on the outer peripheral wall of the end cap includes: A first recessed hole is formed on the outer peripheral wall of the end cap, and a second recessed hole is formed on the bottom surface of the first recessed hole to obtain the first stepped hole. The first recessed hole and the second recessed hole are coaxial, and the diameter of the first recessed hole is larger than the diameter of the second recessed hole.

3. The processing method according to claim 2, characterized in that, Forming a second stepped hole coaxial with the initial hole on the bottom surface of the first stepped hole includes: A third, fourth, fifth, and sixth concave hole are formed on the bottom surface of the second concave hole by using a stepped drill, which are coaxially connected in sequence, to obtain the second stepped hole. The diameters of the third, fourth, fifth, and sixth concave holes decrease sequentially.

4. The processing method according to claim 3, characterized in that, Machining internal threads on at least a portion of the bore wall of the second stepped bore includes: Tap the inner wall of the fourth recessed hole to machine it into a threaded hole, thus obtaining the end cap valve hole.

5. The processing method according to claim 3, characterized in that, After forming a second stepped hole coaxial with the initial hole on the bottom surface of the first stepped hole, the method further includes: The second stepped hole is finished using a stepped reamer.

6. The processing method according to any one of claims 1 to 5, characterized in that, Before forming the initial hole on the outer peripheral wall of the end cap, the process also includes: The machining area on the outer peripheral wall of the end cap is milled flat. The machining area is used to machine the initial hole. The minimum width of the machining area is greater than the maximum diameter of the first stepped hole.

7. The processing method according to claim 6, characterized in that, Forming an initial hole on the outer peripheral wall of the end cap includes: When machining the initial hole in the machining area, coolant is added to the machining area.

8. The processing method according to any one of claims 1 to 5, characterized in that, The processing method further includes: When machining the first stepped hole and the second stepped hole, a suction device is used to extract iron filings from one end of the initial hole located in the inner hole of the end cap.

9. The processing method according to claim 8, characterized in that, The suction device includes a vacuum pump and a suction box. The inner cavity of the suction box is connected to the air intake port of the vacuum pump, and the first end face of the suction box has a through suction port.

10. The processing method according to claim 9, characterized in that, The suction device further includes: a controller, an electromagnet, and a drive unit. The controller is electrically connected to the electromagnet, the drive unit, and the vacuum pump respectively. The electromagnet is located on the first end face and is arranged at intervals with the suction port. The drive unit is connected to the suction box and is used to drive the suction box to move closer to or away from the end cap valve hole along the axial direction of the end cap valve hole. The controller is used to control the electromagnet to be energized when the driving component drives the suction box closer to the end cap valve hole, and to control the electromagnet to be de-energized when the driving component drives the suction box away from the end cap valve hole, and to control the vacuum pump to work.

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