A drilling jig and a marking method for locating outer circle features of an oil distribution shaft using the same

Abstract

The present invention discloses a drilling jig and a marking method for locating the outer circle feature of an oil distribution shaft using the same, belonging to the field of metal processing technology. The drilling jig is set as a sleeve cover structure so that it can be connected to the end of a shaft part to be processed by a threaded connection, so as to locate the processing of the end face and outer circle features of the part. The drilling jig of the present invention has a simple structure and is easy to use. It can realize the threaded connection on the end of the oil distribution shaft to be processed, so that the drilling jig and the oil distribution shaft can form an integral structure, ensuring the convenience and accuracy of the drilling jig setting, reducing the time for aligning and clamping the drilling jig and the oil distribution shaft, and only requiring one assembly to complete the marking process of the oil distribution shaft, greatly improving the assembly and positioning efficiency of the drilling jig and the oil distribution shaft, reducing the processing cost of the oil distribution shaft, and having good practical value and promotion prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of metal processing, and in particular relates to a drilling jig and a marking method for locating the outer circle feature of an oil distribution shaft by using the drilling jig. Background Art

[0002] As an important part of the hydraulic motor, the oil distribution shaft has the remarkable feature of having oil holes in the axial and radial directions. At the same time, for some special oil distribution shafts, it not only needs to provide hydraulic oil for the hydraulic motor, but also serves as an important connecting part to connect the hydraulic system with the main frame of the device.

[0003] Generally, a hydraulic motor mounting countersunk hole is opened at one end of the oil distribution shaft, and several deep holes with different oil chambers and several groups of positioning mounting screw holes are opened on the end face of the oil distribution shaft, and multiple groups of keyways and oil holes are set on the outer circle of the oil distribution shaft. In the traditional processing process, the main process of the above oil distribution shaft often includes: turning (processing the outer circle and end face) - clamping (drilling the end face hole and marking the outer circle hole and groove position dimension line) - milling (processing the outer circle hole and groove) - grinding (grinding the outer circle sealing positions) and other processes.

[0004] In the above process, the processing of each hole on the oil distribution shaft often requires the fitter to mark and position it on the dividing head. Although it can meet the needs of actual processing to a certain extent, it is labor-intensive, inefficient, and has poor precision. At the same time, since the openings on the end face of the oil distribution shaft are relatively dense and close to the edge, most conventional drill jigs have no clamping position on the end face, and there is no precise positioning reference between the drill jig and the oil distribution shaft. The drill jig and the part can only be ensured to be coaxial by manual adjustment and naked eye observation by the operator. On the other hand, after the existing drill jig and the part are adjusted to be coaxial, since the drill jig and the part are split structures, the angular reference of the drill jig still needs to be transferred to the part, and then the outer circle features are marked by the upper dividing head. Although this method can save the marking time of each hole on the end face, it increases the adjustment time of the drill jig and the part, and often requires two clampings, which seriously affects the efficiency of the positioning of the drill jig and the part, and increases the processing cost of the oil distribution shaft. Summary of the invention

[0005] In response to one or more of the above-mentioned defects or improvement needs in the prior art, the present invention provides a drilling jig and a marking method for locating the outer circle features of the oil distribution shaft using the drilling jig, which can realize fast and accurate positioning of the drilling jig and the oil distribution shaft parts, improve the efficiency and accuracy of the oil distribution shaft processing, and reduce the processing cost of the oil distribution shaft.

[0006] To achieve the above object, one aspect of the present invention provides a drilling template, which includes a body in a sleeve-cover structure;

[0007] An end surface is coaxially provided on one end surface of the body, and an internal thread is provided on the inner circumferential wall surface of the end surface, so that the body can be connected to the end of the corresponding shaft part to be processed in the form of a threaded connection;

[0008] A plurality of machining positioning holes and at least one fastening screw mounting hole are provided on the end surface of the body away from the end surface; the machining positioning holes are used for machining positioning of corresponding holes on the end to be machined; the fastening screw mounting hole is used for mounting a fastening screw when the drilling jig is connected to the end to be machined, so that the end of the fastening screw is pressed against the end surface of the end to be machined;

[0009] At the same time, an angular reference is arranged on the end face of the body away from the end hole and / or on the outer peripheral annular direction of the body, so as to position the processing features on the outer peripheral annular direction of the shaft-like parts.

[0010] As a further improvement of the present invention, the shaft-like part is an oil distribution shaft, a plurality of axial oil holes are opened between the two end faces thereof, and a plurality of radial oil holes are opened on the outer circumference of the oil distribution shaft.

[0011] As a further improvement of the present invention, a thread backing groove is provided on the inner circumferential wall surface of the bottom of the end surface in an annular direction, and the inner diameter of the thread backing groove is not less than the outer diameter of the end portion to be processed.

[0012] As a further improvement of the present invention, the axial length of the thread backing groove is 3 mm to 5 mm.

[0013] As a further improvement of the present invention, the angular reference is set by at least one of engraving, milling, and setting a boss plane.

[0014] As a further improvement of the present invention, a drill sleeve is installed in the processing positioning hole.

[0015] As a further improvement of the present invention, the outer peripheral surface of the body is subjected to nitriding surface hardening treatment.

[0016] As a further improvement of the present invention, the material of the drilling jig is the same as the material of the shaft parts.

[0017] Another aspect of the present invention provides a method for machining an end face shaft hole of an oil distribution shaft, which is completed by using the drilling jig, and comprises the following steps:

[0018] (1) Coaxially matching the drilling jig with the small-diameter end of the oil distribution shaft entering the clamp sequence in the form of a threaded connection, and installing a fastening screw in at least one of the fastening screw installation holes so that the end of the fastening screw is pressed against the end surface of the small-diameter end;

[0019] (2) Assemble the drilling jig and the oil distribution shaft connected into an integral structure with a dividing head, clamp the outer periphery of the large diameter end of the oil distribution shaft, and adjust the height gauge to be at the same height as the center of the dividing head, and then lock the height gauge;

[0020] (3) rotating the dividing head until the angular reference on the drilling jig coincides with the sharp point of the height gauge, thereby completing the determination of the angular reference of the oil distribution shaft; then, locking the dividing head;

[0021] (4) identifying the outer circle features on the angular reference line of the oil distribution shaft, and moving the height gauge on the marking platform to mark the angular line on the outer periphery of the oil distribution shaft along the axial direction;

[0022] (5) marking the non-angular line, loosening the dividing head and rotating the corresponding angle relative to the angular reference, adjusting the corresponding position on the outer periphery of the oil distribution shaft to the marking position of the angular line in step (4), then locking the dividing head, and completing the marking of the angular line at the outer periphery position of the oil distribution shaft according to the marking process in step (4);

[0023] (6) Repeat step (5) to complete the marking of each angular line on the outer periphery of the minor diameter end of the oil distribution shaft; thereafter, combining the axial dimensions of the outer circular features on each angular line, complete the marking of the axial position lines of each outer circular feature.

[0024] As a further improvement of the present invention, the oil distribution shaft is of a type with an external thread at the small diameter end. After the shaft hole on its end face is processed, the fastening screw and the drilling jig are successively unscrewed to complete the end face shaft hole processing of the oil distribution shaft;

[0025] or

[0026] The oil distribution shaft is of the type that does not have an external thread on the small diameter end; at this time, an additional machining allowance is provided at the end of the small diameter end, and an external thread is opened on the outer periphery of the machining allowance to match it with the drilling jig thread; accordingly, after completing the machining of each end face shaft hole, the fastening screw and the drilling jig are removed, and the entire machining allowance with the external thread is removed.

[0027] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0028] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

[0029] (1) The drilling jig of the present invention is configured as a sleeve-type structure so that it can be connected to the end of a shaft part to be processed by a threaded connection, so as to position the end face shaft hole of the end, simplify the matching and positioning process of the drilling jig and the part, ensure the positioning accuracy of the drilling jig, and greatly shorten the matching and positioning time of the two, thereby improving the accuracy and efficiency of the drilling jig processing and reducing the processing cost of the corresponding shaft parts.

[0030] (2) The drilling jig of the present invention provides a threaded backing groove at the bottom of the end surface of the drilling jig so that when the drilling jig is matched with a part, the end surface of the part can abut the bottom surface of the end surface of the hole, thereby further improving the accuracy and reliability of the matching between the drilling jig and the part and ensuring the processing accuracy of the part.

[0031] (3) The drilling jig of the present invention has a simple structure and is easy to use. It can realize a threaded connection on the end of the oil distribution shaft to be processed, so that the drilling jig and the oil distribution shaft can form an integral structure, ensuring the convenience and accuracy of the drilling jig setting, reducing the time for positioning and adjusting the drilling jig and the oil distribution shaft, and only requiring one assembly to complete the marking process of the oil distribution shaft, greatly improving the assembly and positioning efficiency of the drilling jig and the oil distribution shaft, and reducing the processing cost of the oil distribution shaft. It has good practical value and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a structural sectional view of a drilling jig in an embodiment of the present invention;

[0033] Figure 2 1 is a left side view of the structure of the drilling jig in the embodiment of the present invention;

[0034] Figure 3 1 is a structural front view of the oil distribution shaft in an embodiment of the present invention;

[0035] Figure 4 is an EE-direction cross-sectional view of the oil distribution shaft in an embodiment of the present invention;

[0036] Figure 5 1 is a right side view of the structure of the oil distribution shaft in the embodiment of the present invention;

[0037] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0038] 1. Drilling jig; 101. End hole; 102. Internal thread; 103. Thread undercut; 104. Angular reference; 105. Processing positioning hole; 106. Set screw installation hole;

[0039] 2. Oil distribution shaft; 201. small diameter end; 202. large diameter end; 203. external thread; 204. radial oil hole; 205. axial oil hole. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] Example:

[0046] See also Figure 1 and Figure 2 The drilling jig 1 in the preferred embodiment of the present invention includes a main body with a sleeve-type structure, one side of the main body is coaxially provided with an end hole 101, and an internal thread 102 is provided on the inner circumferential wall surface of the end hole 101, so that the drilling jig 1 can be connected to the end of the oil distribution shaft 2 to be processed by thread matching.

[0047] In a preferred embodiment, the oil distribution shaft 2 to be processed is as follows: Figure 3 to Figure 5 As shown in the figure, it comprises a coaxially arranged small diameter end 201 and a large diameter end 202, and a mounting countersunk hole for matching the hydraulic motor is arranged on the end surface of the large diameter end 202. Accordingly, it is necessary to open an axially extending axial oil hole 205 between the two end surfaces of the oil distribution shaft 2, and open a plurality of radial oil holes 204 on the outer periphery of the small diameter end 201 to communicate with the corresponding axial oil holes 205.

[0048] In order to achieve the matching between the drilling jig 1 and the oil distribution shaft 2, an external thread 203 is provided in the circumferential direction on the outer circumference of the end of the small diameter end 201 away from the large diameter end 202, which is used to match the thread of the internal thread 102 of the drilling jig 1. Obviously, in actual use, the oil distribution shaft 2 that uses the drilling jig 1 in the preferred embodiment for matching processing needs to have an external thread 203 on the end of its small diameter end 201. For the oil distribution shaft 2 with the external thread 203 on the end of the small diameter end 201 itself, the above-mentioned drilling jig 1 can be used directly, and for the oil distribution shaft 2 where the external thread 203 cannot be provided on the outer circumference of the small diameter end 201, a matching section of a certain length can be reserved at the end of the small diameter end 201 before drilling, which is used as a processing allowance, and the external thread 203 is correspondingly provided on the outer circumference of the matching section. After the drilling of the oil distribution shaft 2 is completed, the above-mentioned processing allowance can be cut off.

[0049] It can be understood that the drilling jig 1 in the preferred embodiment can meet the processing requirements of different types of oil distribution shafts 2. When the outer diameter size of the small-diameter end 201 is different, the drilling jig 1 with the corresponding end hole 101 size can be replaced accordingly.

[0050] In more detail, a threaded undercut groove 103 is provided on the inner circumferential wall surface of the bottom of the end hole 101 in the preferred embodiment along the circumferential direction, and its axial length is preferably 3 mm to 5 mm, and is connected to the bottom surface of the end hole 101. Accordingly, the inner diameter of the threaded undercut groove 103 is not less than the outer diameter of the end of the small diameter end 201, so that when the drilling jig 1 is coaxially matched with the small diameter end 201, the end surface of the small diameter end 201 can abut against the bottom surface of the end hole 101, thereby ensuring the accuracy of the matching between the two.

[0051] At the same time, in order to achieve the reliability of the matching between the drill jig 1 and the oil distribution shaft 2 and prevent the drill jig 1 from rotating or shaking relative to the small-diameter end 201 when in use, at least one fixing screw mounting hole 106 is axially opened on the outer end face of the drill jig 1 and passes through the end hole 101 for threaded installation of the fixing screw, so that when the drill jig 1 matches the oil distribution shaft 2, the end of the fixing screw can be abutted and pressed against the end face of the small-diameter end 201, thereby ensuring the reliability of the setting of the drill jig 1.

[0052] Obviously, it is also necessary to open a plurality of machining positioning holes 105 on the outer end surface of the drilling jig 1 corresponding to the oil holes to be machined of the oil distribution shaft 2, specifically, the axial oil holes 205 to be machined. Figure 2 As shown in , it is used for positioning when machining the axial oil hole 205 and / or several threaded connection holes on the end face of the small diameter end 201. For example, Figure 5 In the oil distribution shaft 2 shown, four axial oil holes 205 and four positioning mounting screw holes are drilled axially on the end surface of its small diameter end 201; accordingly, eight machining positioning holes 105 communicating with the end surface holes 101 are opened on the end surface of the drilling jig 1.

[0053] Preferably, a drill sleeve can be installed in the machining positioning hole 105 in the preferred embodiment, and the drill jig 1 can be further preferably subjected to surface hardening treatment such as nitriding to improve the service life of the drill jig 1 and ensure the positioning accuracy of the machining positioning hole 105 during drilling. In addition, in actual settings, the material of the drill jig 1 is preferably the same as that of the matching oil distribution shaft 2.

[0054] Furthermore, at least one angular reference 104 is provided on the outer peripheral wall surface of the drilling jig 1, which is preferably provided by engraving, milling or providing a boss plane, and the angular reference 104 can be provided on the outer end surface of the drilling jig 1 or on the outer peripheral wall surface of the drilling jig 1. For example, in a preferred embodiment, an angular reference line is provided on both the outer end surface and the outer peripheral wall surface, such as Figure 1 , Figure 2 as shown in .

[0055] The corresponding setting of the angular reference 104 can be used to locate the opening of the corresponding radial oil hole 204 after the axial oil hole 205 is opened, so that the radial oil hole 204 can be accurately connected with the corresponding axial oil hole 205. In specific operation, the processing of the radial oil hole 204 needs to be achieved with the help of the matching work of the indexing head, which accurately marks the outer peripheral wall surface of the small diameter end 201 along the axial direction, so as to accurately locate the opening position of the radial oil hole 204, and complete the subsequent processing of the radial oil hole 204 on this basis.

[0056] More specifically, in a preferred embodiment, the marking method for locating the outer circle feature of the oil distribution shaft 2 using the above-mentioned drilling jig 1 includes the following process:

[0057] (1) Match the drilling jig 1 to the small diameter end 201 of the oil distribution shaft 2 entering the clamping sequence, and prepare to draw the holes on the end face of the oil distribution shaft 2, the keyways / oil hole positioning lines on the periphery, and the processing of the peripheral hole grooves. At this time, the sealing groove, end face countersunk platform, and part of the outer cylindrical surface of the oil distribution shaft 2 have been processed in place (a small amount of grinding is left on some outer cylindrical surfaces).

[0058] (2) The drilling jig 1 is connected to the small-diameter end 201 by matching the internal thread 102 with the external thread 203, so that the end face of the small-diameter end 201 abuts against the bottom face of the end hole 101; thereafter, a set screw is installed in the set screw mounting hole 106, so that the end of the set screw abuts against the end face of the small-diameter end 201, ensuring that the drilling jig 1 is firmly installed and there is no shaking between the drilling jig 1 and the oil distribution shaft 2.

[0059] (3) Assemble the matched drilling jig 1 and oil distribution shaft 2 onto the dividing head, clamp the outer periphery of the large diameter end 202 of the oil distribution shaft 2, adjust the height gauge until it is at the same height as the center of the dividing head, and then lock the height gauge.

[0060] (4) Rotate the dividing head until the angular reference 104 on the drilling jig 1 coincides with the sharp point of the height gauge, thereby completing the angular reference determination of the oil distribution shaft 2. Then, lock the dividing head.

[0061] (5) Identify the outer circle features on the angular reference line of the oil distribution shaft 2, move the height gauge on the marking platform, mark the outer circumference of the oil distribution shaft 2 along the axial direction, and complete the determination of the corresponding keyway / hole angular line;

[0062] (6) Marking of non-angular lines. Loosen the dividing head and rotate the corresponding angle relative to the angular reference 104, adjust the corresponding position on the outer periphery of the oil distribution shaft 2 to the position of the original angular reference, then lock the dividing head and complete the marking of the angular line (marked along the axial extension) on the outer periphery according to the operation in step (5), and determine the opening position of the corresponding hole / groove on the angular line.

[0063] (7) In coordination with the determination of the axial dimensions of each machining feature, the axial position line (drawn along the circumferential direction) corresponding to the machining feature on each angular line is drawn. The intersection of the axial position line and the angular line is the machining position of the corresponding outer circular feature.

[0064] In actual operation, the axial position line can be marked after being determined by a vernier caliper, or after the entire part is removed from the dividing head, the large diameter end 202 is placed horizontally on a platform and then marked with a height gauge.

[0065] It can be understood that after completing the marking of each characteristic part on the outer periphery of the small diameter end 201, the part can be removed from the dividing head and installed on the drilling machine, and the holes on the end face of the small diameter end 201 can be drilled according to the positioning of the processing positioning hole 105, and the processing of each external cylindrical feature can be completed in combination with the marking positioning on the outer periphery of the oil distribution shaft 2.

[0066] The drilling jig in the present invention has a simple structure and is easy to use. It can realize threaded connection on the end of the oil distribution shaft to be processed, so that the drilling jig and the oil distribution shaft can form an integral structure, ensuring the convenience and accuracy of the drilling jig setting, reducing the time for positioning and adjusting the drilling jig and the oil distribution shaft, and only requiring one assembly to complete the marking process of the oil distribution shaft, greatly improving the assembly and positioning efficiency of the drilling jig and the oil distribution shaft, reducing the processing cost of the oil distribution shaft, and having good practical value and promotion prospects.

[0067] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A marking method for positioning the outer circle feature of an oil distribution shaft, which is implemented by using a drilling jig, and is characterized in that: The drilling template comprises a main body in a sleeve-cover structure; An end surface is coaxially provided on one end surface of the body, and an internal thread is provided on the inner circumferential wall surface of the end surface, so that the body can be connected to the end of the corresponding shaft part to be processed in the form of a threaded connection; A plurality of machining positioning holes and at least one fastening screw installation hole are provided on the end surface of the body away from the end surface; a drill sleeve is installed in the machining positioning hole for machining positioning of the corresponding hole on the end to be machined; the fastening screw installation hole is used to install a fastening screw when the drill jig is connected to the end to be machined, so that the end of the fastening screw is pressed against the end surface of the end to be machined; At the same time, an angular reference is provided on the end face of the body away from the end face hole and / or on the outer peripheral annular direction of the body, and the angular reference is provided by at least one of engraving, milling, and setting a boss plane, and is used for positioning the processing features on the outer peripheral annular direction of the shaft part; The marking method for locating the outer circle feature of the oil distribution shaft by using the drilling jig comprises the following steps: (1) Coaxially matching the drilling jig with the small-diameter end of the oil distribution shaft entering the clamp sequence in the form of a threaded connection, and installing a fastening screw in at least one of the fastening screw installation holes so that the end of the fastening screw is pressed against the end surface of the small-diameter end; (2) Assemble the drilling jig and the oil distribution shaft connected into an integral structure with a dividing head, clamp the outer periphery of the large diameter end of the oil distribution shaft, and adjust the height gauge to be at the same height as the center of the dividing head, and then lock the height gauge; (3) Rotate the dividing head until the angular reference on the drilling jig coincides with the sharp point of the height gauge, thereby completing the determination of the angular reference of the oil distribution shaft; then, lock the dividing head; (4) identifying the outer circle features on the angular reference line of the oil distribution shaft, and moving the height gauge on the marking platform to mark the angular line on the outer periphery of the oil distribution shaft along the axial direction; (5) Marking the non-angular line, loosen the dividing head and rotate the corresponding angle relative to the angular reference, adjust the corresponding position on the outer periphery of the oil distribution shaft to the marking position of the angular line in step (4), then lock the dividing head, and complete the marking of the angular line at the outer periphery position of the oil distribution shaft according to the marking process in step (4); (6) Repeat step (5) to complete the marking of the angular lines on the outer circumference of the minor diameter end of the oil distribution shaft; thereafter, combining the axial dimensions of the outer cylindrical features on each angular line, complete the marking of the axial position lines of each outer cylindrical feature.

2. The marking method for the outer circle feature of the oil distribution shaft according to claim 1, wherein: The shaft part is an oil distribution shaft, a plurality of axial oil holes are opened between the two end faces of the shaft, and a plurality of radial oil holes are opened on the outer periphery of the oil distribution shaft.

3. The method for marking the outer circle feature of the oil distribution shaft according to claim 1 or 2, wherein: A thread backing groove is provided on the inner circumferential wall surface of the bottom of the end surface in the circumferential direction, and the inner diameter of the thread backing groove is not less than the outer diameter of the end portion to be processed.

4. The method for marking the outer circle feature of the oil distribution shaft according to claim 3, wherein: The axial length of the thread backing groove is 3 mm to 5 mm.

5. The method for marking the outer circle feature of the oil distribution shaft according to claim 1, 2 or 4, wherein: The outer peripheral surface of the body is subjected to nitriding surface hardening treatment.

6. The method for marking the outer circle feature of the oil distribution shaft according to claim 1, 2 or 4, wherein: The material of the drilling jig is the same as that of the shaft parts.

7. The method for marking the outer circle feature of the oil distribution shaft according to claim 1, 2 or 4, wherein: The oil distribution shaft is of the type with an external thread at the small diameter end. After the shaft hole processing on its end face is completed, the fastening screws and the drilling jig are successively unscrewed to complete the end face shaft hole processing of the oil distribution shaft.

8. The method for marking the outer circle feature of the oil distribution shaft according to claim 1, 2 or 4, wherein: The oil distribution shaft is of the type that does not have an external thread on the small diameter end; at this time, an additional machining allowance is provided at the end of the small diameter end, and an external thread is opened on the outer periphery of the machining allowance to match it with the drilling jig thread; accordingly, after completing the machining of each end face shaft hole, the fastening screw and the drilling jig are removed, and the entire machining allowance with the external thread is removed.

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