Boring tool and camshaft hole processing method

Abstract

The application relates to the technical field of camshaft hole machining, in particular to a boring cutter and a camshaft hole machining method, wherein the boring cutter comprises a cutter body, a cutter and a first guide strip. One end of the cutter body is provided with a mounting portion suitable for being connected with a machine tool; the cutter is arranged on the cutter body and is arranged in a spaced mode with the mounting portion along the extension direction of the cutter body; the first guide strip is arranged on the cutter body, the extension direction of the first guide strip is consistent with the extension direction of the cutter body, the first guide strip is arranged on the side of the cutter far away from the mounting portion, and the first guide strip is suitable for being guided by the camshaft hole. According to the boring cutter, the position of the first guide strip is reasonably arranged, the cutter can be guided by the first guide strip when the boring cutter is used for machining the first gear camshaft hole, and the camshaft hole in the vermiculite material can meet the machining precision requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of camshaft hole machining, and particularly relates to a boring tool and a camshaft hole machining method. BACKGROUND

[0002] This part provides only background information related to the present disclosure, which is not necessarily prior art.

[0003] During the manufacturing process of an engine, a camshaft hole needs to be machined. In the prior art, a machining hole is opened in the engine, and a boring tool is used to machine the machining hole to machine the camshaft hole.

[0004] However, the guide structure of the boring tool in the prior art is located at the rear side of the tool. When machining the first gear camshaft hole, the guide structure cannot guide the boring tool. When the camshaft hole is located on a vermiculite material, the machining precision of the camshaft hole machined by the prior art cannot meet the machining precision requirement due to the poor chip performance of the vermiculite material. SUMMARY

[0005] The present application aims to at least solve the problems that the guide structure cannot guide the boring tool when machining the first gear camshaft hole, and the machining precision of the camshaft hole machined by the prior art cannot meet the machining precision requirement. The aim is achieved by the following technical solutions:

[0006] The boring tool according to the present application comprises a tool body, a tool, and a first guide strip. One end of the tool body is provided with a mounting portion adapted to be connected to a machine tool. The tool is arranged on the tool body and is spaced apart from the mounting portion along the extension direction of the tool body. The first guide strip is arranged on the tool body, the extension direction of the first guide strip is consistent with the extension direction of the tool body, the first guide strip is arranged on the side of the tool away from the mounting portion, and the first guide strip is adapted to be guided by the camshaft hole.

[0007] According to the boring tool of the present application, the position of the first guide strip is reasonably arranged. When the boring tool machines the first gear camshaft hole, the tool can be guided by the first guide strip, so that the machining precision of the camshaft hole located on the vermiculite material can meet the machining precision requirement.

[0008] In addition, the boring tool according to the present application can also have the following additional technical features:

[0009] In some embodiments, the boring tool further comprises a second guide strip arranged on the tool body, the extension direction of the second guide strip is consistent with the extension direction of the tool body, the second guide strip is located between the second mounting portion and the tool in the extension direction of the tool body, and the second guide strip is adapted to be guided by the camshaft hole.

[0010] In some embodiments, the length of the first guide strip is configured to be greater than the distance between adjacent camshaft holes; and / or, the length of the second guide strip is configured to be greater than the distance between adjacent camshaft holes.

[0011] In some embodiments, the first guide strip has a dimension in the radial direction of the cutter body that is less than the dimension of the second guide strip in the radial direction of the cutter body.

[0012] In some embodiments, the first guide strip is provided in a plurality, and the plurality of first guide strips are arranged in the circumferential direction of the cutter body; the second guide strip is provided in a plurality, and the plurality of second guide strips are arranged in the circumferential direction of the cutter body.

[0013] In some embodiments, the plurality of first guide strips are arranged in one-to-one correspondence with the plurality of second guide strips in the extension direction of the cutter body, and the cutter is located between adjacent first guide strips in the circumferential direction of the cutter body.

[0014] Embodiments of the present application also propose a camshaft hole machining method, which comprises a first boring cutter for machining camshaft holes, the first boring cutter comprising a cutter body, a cutter, and a first guide strip, one end of the cutter body being provided with a mounting portion adapted to be connected to a machine tool; the cutter is arranged on the cutter body; the first guide strip is arranged on the cutter body, the extension direction of the first guide strip being consistent with the extension direction of the cutter body, and the cutter is located between the mounting portion and the first guide strip in the extension direction of the cutter body, the camshaft hole machining method comprising: extending the cutter body of the first boring cutter into a first-order camshaft hole, guiding the first guide strip through a first-order camshaft hole and a second-order camshaft hole, and making the cutter of the first boring cutter machine the first-order camshaft hole.

[0015] According to the camshaft hole machining method of the embodiments of the present application, by locating the cutter between the mounting portion and the first guide strip in the extension direction of the cutter body, when the boring cutter machines the first-order camshaft hole, the first guide strip can be guided through the first-order camshaft hole and the second-order camshaft hole to guide the cutter, and the camshaft hole in the vermiculite material can meet the machining precision requirement.

[0016] In some embodiments, the camshaft hole machining method further machines the camshaft hole by a second boring tool, the second boring tool comprising the tool body, the cutter, the first guide bar and a second guide bar, the second guide bar extending in the same direction as the tool body, the second guide bar being located between the second mounting portion and the cutter in the extending direction of the tool body, the camshaft hole machining method further comprising: switching the first boring tool to the second boring tool after machining the first gear camshaft hole; extending the tool body of the second boring tool into the second gear camshaft hole, guiding the first guide bar of the second boring tool through the second gear camshaft hole and the third gear camshaft hole, guiding the second guide bar of the second boring tool through the first gear camshaft hole, and machining the second gear camshaft hole by the cutter of the second boring tool; extending the tool body of the second boring tool into the third gear camshaft hole, guiding the first guide bar of the second boring tool through the third gear camshaft hole and the fourth gear camshaft hole, guiding the second guide bar of the second boring tool through the second gear camshaft hole, and machining the third gear camshaft hole by the cutter of the second boring tool; extending the tool body of the second boring tool into the fourth gear camshaft hole, guiding the first guide bar of the second boring tool through the fourth gear camshaft hole and the fifth gear camshaft hole, guiding the second guide bar of the second boring tool through the third gear camshaft hole, and machining the fourth gear camshaft hole by the cutter of the second boring tool; and extending the tool body of the second boring tool into the fifth gear camshaft hole, guiding the first guide bar of the second boring tool through the fifth gear camshaft hole, guiding the second guide bar of the second boring tool through the fourth gear camshaft hole, and machining the fifth gear camshaft hole by the cutter of the second boring tool.

[0017] In some embodiments, the camshaft hole machining method further comprises: adjusting the first boring tool to make the run-out value of the first guide bar less than or equal to 0.003 mm before machining the first gear camshaft hole by the cutter of the first boring tool.

[0018] In some embodiments, the camshaft hole machining method further comprises: adjusting the second boring tool to make the run-out value of the first guide bar and the run-out value of the second guide bar both less than or equal to 0.003 mm before machining the second gear camshaft hole by the cutter of the second boring tool. BRIEF DESCRIPTION OF DRAWINGS

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0020] Figure 1 This is a schematic diagram of the camshaft bore.

[0021] Figure 2 This is a schematic diagram of a boring tool in the prior art;

[0022] Figure 3 This is a schematic diagram of a boring tool according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the boring tool pre-machining the starting position of the first camshaft hole according to another embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of a boring tool machining the termination position of the first camshaft hole according to another embodiment of the present invention;

[0025] Figure 6 for Figure 3 A schematic diagram of the structure for machining the starting position of the second camshaft hole with a boring tool;

[0026] Figure 7 for Figure 3 A schematic diagram of the structure for machining the termination position of the second camshaft hole with a boring tool;

[0027] Figure 8 for Figure 3 A schematic diagram of the structure for machining the starting position of the camshaft hole in the third gear using a boring tool;

[0028] Figure 9 for Figure 3 A schematic diagram of the structure for machining the 3rd gear camshaft hole termination position with a boring tool;

[0029] Figure 10 for Figure 3 A schematic diagram of the structure for machining the starting position of the 4th gear camshaft hole with a boring tool;

[0030] Figure 11 for Figure 3 A schematic diagram of the structure for machining the fourth camshaft hole using a boring tool;

[0031] Figure 12 for Figure 3 A schematic diagram of the structure for machining the starting position of the 5th gear camshaft hole with a boring tool;

[0032] Figure 13 for Figure 3Fig. 2 is a structural schematic view of a boring tool for machining a 5th gear camshaft hole end position.

[0033] Reference signs are as follows:

[0034] 100 boring tool

[0035] 1 tool body; 11 mounting portion

[0036] 2 tool

[0037] 3 first guide bar

[0038] 4 second guide bar

[0039] 200 camshaft hole

[0040] 210 1st gear camshaft hole; 220 2nd gear camshaft hole; 230 3rd gear camshaft hole; 240 4th gear camshaft hole; 250 5th gear camshaft hole DETAILED DESCRIPTION

[0041] Example embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0042] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0043] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0044] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0045] The engine camshaft bore 200 can be provided with multiple locations. For example... Figure 1 As shown, for example, the camshaft hole 200 can be provided with 5 holes, that is, the camshaft hole 200 includes a first-stage camshaft hole 210, a second-stage camshaft hole 220, a third-stage camshaft hole 230, a fourth-stage camshaft hole 240, and a fifth-stage camshaft hole 250. The first-stage camshaft hole 210, the second-stage camshaft hole 220, the third-stage camshaft hole 230, the fourth-stage camshaft hole 240, and the fifth-stage camshaft hole 250 are arranged coaxially and spaced apart. The first-stage camshaft hole 210 is located on one side of the second-stage camshaft hole 220, the third-stage camshaft hole 230, and the fourth-stage camshaft hole 240, and the fifth-stage camshaft hole 250 is located on the other side of the second-stage camshaft hole 220, the third-stage camshaft hole 230, and the fourth-stage camshaft hole 240.

[0046] like Figures 3 to 13As shown, the embodiment of the present application provides a boring tool 100, comprising a tool body 1, a tool bit 2 and a first guide bar 3. One end of the tool body 1 is provided with a mounting portion 11 adapted to be connected with a machine tool. The tool bit 2 is arranged on the tool body 1 and is spaced apart from the mounting portion 11 along the extension direction of the tool body 1. The first guide bar 3 is adapted to be guided by a camshaft hole 200. The first guide bar 3 is arranged on the tool body 1, the extension direction of the first guide bar 3 is consistent with the extension direction of the tool body 1, and the first guide bar 3 is arranged on the side of the tool bit 2 away from the mounting portion 11.

[0047] The extension direction of the tool body 1 is shown by the arrow in Fig. 1. Figures 3 to 13

[0048] When the camshaft hole 200 is machined, the boring tool 100 needs to be moved close to the camshaft hole 200 by the machine tool, the mounting portion 11 is arranged on the side of the tool bit 2 close to the machine tool and is mounted on the machine tool, the first guide bar 3 is arranged on the side of the tool bit 2 close to the camshaft hole 200, and the tool bit 2 is arranged between the mounting portion 11 and the first guide bar 3. Therefore, when the camshaft hole 200 is machined, the first guide bar 3 enters the camshaft hole 200 earlier than the tool bit 2, so as to guide the tool body 1 and guide the tool bit 2.

[0049] The boring tool 100 of the embodiment of the present application sets the position of the first guide bar 3, so that when the first camshaft hole 200 is machined by the boring tool 100, the tool bit 2 can be guided by the first guide bar 3, thereby enabling the camshaft hole 200 in the vermiculite material to meet the machining precision requirement.

[0050] The guide structure of the boring tool in the prior art is arranged on the rear side of the tool bit. When a deep machining hole is machined or the rigidity of the boring tool is weak, the camshaft hole is prone to produce vibration marks. In addition, when the camshaft hole is arranged on the vermiculite material, the machining precision of the boring tool in the prior art is low and cannot meet the machining precision requirement that the adjacent camshaft holes have a runout value less than or equal to 0.02 mm. The runout value is the value of the runout tolerance.

[0051] Therefore, as shown in some embodiments, the boring tool 100 further comprises a second guide bar 4 arranged on the tool body 1, the extension direction of the second guide bar 4 is consistent with the extension direction of the tool body 1, the second guide bar 4 is arranged between the second mounting portion 11 and the tool bit 2 in the extension direction of the tool body 1, and the second guide bar 4 is adapted to be guided by the camshaft hole 200. Figure 3 The following will analyze the stress of the boring tool in the prior art and the boring tool 100 of the embodiment of the present application.

[0052] Figure 2 Figure 3

[0053] ​​​​The force borne by the cutter of the prior art boring cutter and the cutter 2 of the boring cutter 100 of the embodiment of the present application is F.

[0054] The force borne by the guide bar of the prior art is F1 and F2, which are opposite to F in direction. The force borne by the cutter body of the machine tool is F3, and when the cutter body is in a balanced state, F3*L=F1*(L-L1)+F2*(L-L2) can be obtained, so it can be known that the direction of F3 is opposite to F1 and F2, and the direction of F3 is the same as F.

[0055] The force borne by the first guide bar of the embodiment of the present application is F4, and the force borne by the second guide bar is F5, which are opposite to F in direction. The force borne by the mounting portion 11 is F6, and the direction is unknown, and when the cutter body is in a balanced state, F6*L=F4*(L-L2)+F5*(L5-L) can be obtained.

[0056] It can be known that F1*L1+F2*L2=F4*L2+F5*L5.

[0057] L1=L2-L3; L5=L2+L4; F1*(L2-L3)+F2*L2=F4*L2+F5*(L2+L4) can be obtained.

[0058] F1*L2+F2*L2-F4*L2-F5*L2=F1*L3+F5*L4 can be obtained.

[0059] F1*L3+F5*L4, F1, L3, F5, L4 are all greater than 0, and F1*L3+F5*L4 is greater than 0; that is,

[0060] F1*L2+F2*L2-F4*L2-F5*L2>0, since L2 is a positive number, F1+F2-F4-F5>0, and moving terms can be known that F1+F2>F4+F5.

[0061] F+F3=F1+F2, F+F6=F4+F5. Since F1+F2>F4+F5, F+F3>F+F6, and F3>F6 can be obtained by simplifying. Thus, the boring tool 100 of the embodiment of the present application can maintain the tool body 1 and the tool 2 in a stable state under smaller stress during the process of machining the camshaft hole 200.

[0062] When the camshaft hole 200 is machined, the first guide bar 3 is located on one side of the tool 2 and guides the tool body 1 to guide the tool 2, and the second guide bar 4 is located on the other side of the tool 2 and guides the tool body 1 to guide the tool 2. By arranging the first guide bar 3 and the second guide bar 4 on both sides of the tool 2, the first guide bar 3 and the second guide bar 4 can maintain the tool body 1 and the tool 2 in a stable state under smaller stress, so that the tool 2 can withstand greater force while the tool 2 and the tool body 1 remain stable, thereby avoiding the tool body 1 and the tool 2 from shaking, so that the camshaft hole 200 can be avoided from producing shake marks. Moreover, since the tool 2 can withstand greater force while the tool 2 and the tool body 1 remain stable, the tool 2 can provide greater boring force to the camshaft hole 200, so that the boring tool 100 of the embodiment of the present application has higher machining precision when machining the vermiculite, thereby meeting the machining precision requirement that the adjacent camshaft holes 200 have a runout value less than or equal to 0.02mm.

[0063] In some embodiments, the length of the first guide bar 3 is configured to be greater than the distance between adjacent camshaft holes 200.

[0064] The distance between adjacent camshaft holes 200 refers to the distance between the front end of one camshaft hole 200 and the front end of the adjacent camshaft hole 200, or the distance between the rear end of one camshaft hole 200 and the rear end of the adjacent camshaft hole 200. For example, the distance between the end of the first camshaft hole 210 away from the second camshaft hole 220 and the end of the second camshaft hole 220 close to the first camshaft hole 210.

[0065] As Figure 4 and Figure 5As shown, when machining the first-gear camshaft hole 210, the mounting part 11 is mounted on the machine tool to connect the machine tool and the mounting part 11. The boring bar 100 is brought close to the first-gear camshaft hole 210. The first guide bar 3 extends into the first-gear camshaft hole 200 before the tool 2 to guide the tool 2. When the tool 2 has just entered the first-gear camshaft hole 210 to machine it, a portion of the first guide bar 3 is located within the first-gear camshaft hole 210, and another portion is located within the second-gear camshaft hole 220 to guide the tool body 1, thereby guiding the tool 2. When the tool 2 is machining the first-gear camshaft hole 210, a portion of the first guide bar 3 is located within the first-gear camshaft hole 210. When the tool 2 finishes machining the first-gear camshaft hole 210, the first guide bar 3 disengages from the first-gear camshaft hole 210.

[0066] like Figure 6 and Figure 7 As shown, when machining the second-gear camshaft hole 220, when the tool 2 has just entered the second-gear camshaft hole 220, a portion of the first guide bar 3 is located inside the second-gear camshaft hole 220, and another portion of the first guide bar 3 is located inside the third-gear camshaft hole 230, to guide the tool body 1, thereby guiding the tool 2. When the tool 2 is machining the second-gear camshaft hole 220, a portion of the first guide bar 3 is located inside the second-gear camshaft hole 220. When the tool 2 finishes machining the second-gear camshaft hole 220, the first guide bar 3 disengages from the second-gear camshaft hole 220.

[0067] like Figure 8 and Figure 9 As shown, when machining the third-gear camshaft hole 230, when the tool 2 just enters the third-gear camshaft hole 230 for machining, a portion of the first guide bar 3 is located inside the third-gear camshaft hole 230, and the other portion of the first guide bar 3 is located inside the fourth-gear camshaft hole 240 to guide the tool body 1, thereby guiding the tool 2. When the tool 2 is machining the third-gear camshaft hole 230, a portion of the first guide bar 3 is located inside the third-gear camshaft hole 230. When the tool 2 finishes machining the third-gear camshaft hole 230, the first guide bar 3 disengages from the third-gear camshaft hole 230.

[0068] like Figure 10 and Figure 11As shown in FIG. 1, when the cutter 2 is just extended into the fourth-gear camshaft hole 240 to process the fourth-gear camshaft hole 240, a part of the first guide strip 3 is located in the fourth-gear camshaft hole 240 to guide the cutter body 1, thereby guiding the cutter 2. When the cutter 2 processes the fourth-gear camshaft hole 240, a part of the first guide strip 3 is located in the fourth-gear camshaft hole 240. When the cutter 2 finishes processing the fourth-gear camshaft hole 240, the first guide strip 3 is separated from the fourth-gear camshaft hole 240.

[0069] As shown in FIG. 1, when the cutter 2 is just extended into the fourth-gear camshaft hole 240 to process the fourth-gear camshaft hole 240, a part of the first guide strip 3 is located in the fourth-gear camshaft hole 240 to guide the cutter body 1, thereby guiding the cutter 2. When the cutter 2 processes the fourth-gear camshaft hole 240, a part of the first guide strip 3 is located in the fourth-gear camshaft hole 240. When the cutter 2 finishes processing the fourth-gear camshaft hole 240, the first guide strip 3 is separated from the fourth-gear camshaft hole 240. Figure 12 Figure 13 As shown in FIG. 1, when the cutter 2 is just extended into the fifth-gear camshaft hole 250 to process the fifth-gear camshaft hole 250, a part of the first guide strip 3 is located in the fifth-gear camshaft hole 250 to guide the cutter body 1, thereby guiding the cutter 2. When the cutter 2 processes the fifth-gear camshaft hole 250, a part of the first guide strip 3 is located in the fifth-gear camshaft hole 250. When the cutter 2 finishes processing the fifth-gear camshaft hole 250, the first guide strip 3 is separated from the fifth-gear camshaft hole 250.

[0070] When the length of the first guide strip 3 is greater than the distance between the adjacent camshaft holes 200, a part of the first guide strip 3 is located in the current camshaft hole 200, and another part of the first guide strip 3 is located in the camshaft hole 200 adjacent to the current camshaft hole 200. That is, when the length of the first guide strip 3 is greater than the distance between the adjacent camshaft holes 200, the first guide strip 3 can be guided by two camshaft holes 200, thereby increasing the guiding ability of the first guide strip 3 and increasing the guiding effect of the first guide strip 3 on the cutter body 1 and the cutter 2.

[0071] In some embodiments, the length of the second guide strip 4 is configured to be greater than the distance between the adjacent camshaft holes 200.

[0072] As shown in FIG. 1, when the cutter 2 is just extended into the second-gear camshaft hole 220 to process the second-gear camshaft hole 220, a part of the second guide strip 4 is located in the first-gear camshaft hole 210 to guide the cutter body 1, thereby guiding the cutter 2. When the cutter 2 processes the second-gear camshaft hole 220 for a distance, a part of the second guide strip 4 is located in the second-gear camshaft hole 220, and another part of the second guide strip 4 is located in the first-gear camshaft hole 210 to guide the cutter body 1, thereby guiding the cutter 2. Figure 6 Figure 7 As shown in FIG. 1, when the cutter 2 is just extended into the second-gear camshaft hole 220 to process the second-gear camshaft hole 220, a part of the second guide strip 4 is located in the first-gear camshaft hole 210 to guide the cutter body 1, thereby guiding the cutter 2. When the cutter 2 processes the second-gear camshaft hole 220 for a distance, a part of the second guide strip 4 is located in the second-gear camshaft hole 220, and another part of the second guide strip 4 is located in the first-gear camshaft hole 210 to guide the cutter body 1, thereby guiding the cutter 2.

[0073] As​​Figure 8 and Figure 9 As shown in Figs. 2 and 3, when the third camshaft hole 230 is being machined, a part of the second guide strip 4 is located in the second camshaft hole 220 to guide the cutter body 1, thereby guiding the cutter 2, when the cutter 2 just extends into the third camshaft hole 230 to machine the third camshaft hole 230. After the cutter 2 machines the third camshaft hole 230 for a distance, a part of the second guide strip 4 is located in the third camshaft hole 230, and another part of the second guide strip 4 is located in the second camshaft hole 220 to guide the cutter body 1, thereby guiding the cutter 2.

[0074] As shown in Figs. 4 and 5, when the fourth camshaft hole 240 is being machined, a part of the second guide strip 4 is located in the third camshaft hole 230 to guide the cutter body 1, thereby guiding the cutter 2, when the cutter 2 just extends into the fourth camshaft hole 240 to machine the fourth camshaft hole 240. After the cutter 2 machines the fourth camshaft hole 240 for a distance, a part of the second guide strip 4 is located in the fourth camshaft hole 240, and another part of the second guide strip 4 is located in the third camshaft hole 230 to guide the cutter body 1, thereby guiding the cutter 2. Figure 10 and Figure 11 As shown in Figs. 4 and 5, when the fourth camshaft hole 240 is being machined, a part of the second guide strip 4 is located in the third camshaft hole 230 to guide the cutter body 1, thereby guiding the cutter 2, when the cutter 2 just extends into the fourth camshaft hole 240 to machine the fourth camshaft hole 240. After the cutter 2 machines the fourth camshaft hole 240 for a distance, a part of the second guide strip 4 is located in the fourth camshaft hole 240, and another part of the second guide strip 4 is located in the third camshaft hole 230 to guide the cutter body 1, thereby guiding the cutter 2.

[0075] As shown in Figs. 6 and 7, when the fifth camshaft hole 250 is being machined, a part of the second guide strip 4 is located in the fourth camshaft hole 240 to guide the cutter body 1, thereby guiding the cutter 2, when the cutter 2 just extends into the fifth camshaft hole 250 to machine the fifth camshaft hole 250. After the cutter 2 machines the fifth camshaft hole 250 for a distance, a part of the second guide strip 4 is located in the fifth camshaft hole 250, and another part of the second guide strip 4 is located in the fourth camshaft hole 240 to guide the cutter body 1, thereby guiding the cutter 2. Figure 12 and Figure 13 As shown in Figs. 6 and 7, when the fifth camshaft hole 250 is being machined, a part of the second guide strip 4 is located in the fourth camshaft hole 240 to guide the cutter body 1, thereby guiding the cutter 2, when the cutter 2 just extends into the fifth camshaft hole 250 to machine the fifth camshaft hole 250. After the cutter 2 machines the fifth camshaft hole 250 for a distance, a part of the second guide strip 4 is located in the fifth camshaft hole 250, and another part of the second guide strip 4 is located in the fourth camshaft hole 240 to guide the cutter body 1, thereby guiding the cutter 2.

[0076] When the length of the second guide strip 4 is greater than the distance between the adjacent camshaft holes 200, a part of the second guide strip 4 is located in the current camshaft hole 200, and another part of the second guide strip 4 is located in the camshaft hole 200 adjacent to the current camshaft hole 200. That is, when the length of the second guide strip 4 is greater than the distance between the adjacent camshaft holes 200, the second guide strip 4 can be guided by two camshaft holes 200, thereby increasing the guiding ability of the second guide strip 4 and increasing the guiding effect of the second guide strip 4 on the cutter body 1 and the cutter 2.

[0077] In some embodiments, the size of the first guide bar 3 in the radial direction of the tool body 1 is smaller than the size of the second guide bar 4 in the radial direction of the tool body 1. That is, the size of the second guide bar 4 in the radial direction of the tool body 1 is greater than the size of the first guide bar 3 in the radial direction of the tool body 1.

[0078] The size of the tool body 1 in the radial direction is as shown by the arrow at b. Figure 3

[0079] Since the first guide bar 3 is located on the side of the tool 2 away from the mounting portion 11, and the second guide bar 4 is located on the side of the tool 2 close to the mounting portion 11, when the first guide bar 3 contacts the camshaft hole 200, the camshaft hole 200 has not been precisely bored by the tool 2, and when the second guide bar 4 contacts the camshaft hole 200, the camshaft hole 200 has already been precisely bored by the tool 2. Therefore, making the size of the first guide bar 3 in the radial direction of the tool body 1 smaller than the size of the second guide bar 4 in the radial direction of the tool body 1 can make the first guide bar 3 and the second guide bar 4 better adapt to the camshaft hole 200, thereby improving the ability of the first guide bar 3 and the second guide bar 4 to increase the guiding effect on the tool body 1 and the tool 2.

[0080] As shown in Figures 3 to 13 In some embodiments, the first guide bar 3 is provided in a plurality, and the plurality of first guide bars 3 are arranged in the circumferential direction of the tool body 1; the second guide bar 4 is provided in a plurality, and the plurality of second guide bars 4 are arranged in the circumferential direction of the tool body 1.

[0081] By providing a plurality of first guide bars 3 and a plurality of second guide bars 4, the guiding ability is improved to increase the guiding effect on the tool body 1 and the tool 2.

[0082] In some embodiments, the plurality of first guide bars 3 are arranged one-to-one with the plurality of second guide bars 4 in the extension direction of the tool body 1. The tool 2 is located between adjacent first guide bars 3 in the circumferential direction of the tool body 1. That is, the tool 2 is located between adjacent second guide bars 4 in the circumferential direction of the tool body 1.

[0083] By arranging the first guide bar 3 and the second guide bar 4 one-to-one, the guiding effect of the first guide bar 3 and the guiding effect of the second guide bar 4 are avoided from interfering with each other. By arranging the tool 2 between adjacent first guide bars 3 in the circumferential direction of the tool body 1, the local stress of the tool body 1 is avoided from being too large.

[0084] ​The camshaft hole machining method of the embodiment of the present application, by making the cutter 2 in the extension direction of the cutter body 1 between the mounting portion 11 and the first guide strip 3, when the boring cutter 100 processes the first-grade camshaft hole 200, the first guide strip 3 can be guided by the first-grade camshaft hole 210 and the second-grade camshaft hole 220 so as to guide the cutter 2, and the camshaft hole 200 in the vermiculite material can meet the machining precision requirement.

[0085] The camshaft hole machining method of the embodiment of the present application, by making the cutter 2 in the extension direction of the cutter body 1 between the mounting portion 11 and the first guide strip 3, when the boring cutter 100 processes the first-grade camshaft hole 200, the first guide strip 3 can be guided by the first-grade camshaft hole 210 and the second-grade camshaft hole 220 so as to guide the cutter 2, and the camshaft hole 200 in the vermiculite material can meet the machining precision requirement.

[0086] The guide structure of the boring cutter in the prior art is located at the rear side of the cutter, when a deeper machining hole is processed or the rigidity of the boring cutter is weaker, the camshaft hole is easy to produce vibration marks. In addition, when the camshaft hole is located on the vermiculite material, the machining precision of the boring cutter in the prior art is lower, and cannot meet the machining precision requirement that the adjacent camshaft hole jump value is less than or equal to 0.02mm.

[0087] In some embodiments, the camshaft hole machining method is also applied to the second boring tool 100, the second boring tool 100 comprising a tool body 1, a tool 2, a first guide bar 3 and a second guide bar 4, the extension direction of the second guide bar 4 being consistent with the extension direction of the tool body 1, the second guide bar 4 being located between the second mounting portion 11 and the tool 2 in the extension direction of the tool body 1, the camshaft hole machining method further comprising: switching the first boring tool to the second boring tool after the machining of the first camshaft hole is completed; extending the tool body 1 of the second boring tool into the second camshaft hole 220, guiding the first guide bar 3 of the second boring tool through the second camshaft hole 220 and the third camshaft hole 230, guiding the second guide bar 4 of the second boring tool through the first camshaft hole 210, and making the tool 2 of the second boring tool 100 machine the second camshaft hole 220; extending the tool body 1 of the second boring tool into the third camshaft hole 230, guiding the first guide bar 3 of the second boring tool through the third camshaft hole 230 and the fourth camshaft hole 240, guiding the second guide bar 4 of the second boring tool through the second camshaft hole 220, and making the tool 2 of the second boring tool machine the third camshaft hole 230; extending the tool body 1 of the second boring tool into the fourth camshaft hole 240, guiding the first guide bar 3 of the second boring tool through the fourth camshaft hole 240 and the fifth camshaft hole 250, guiding the second guide bar 4 of the second boring tool through the third camshaft hole 230, and making the tool 2 of the second boring tool 100 machine the fourth camshaft hole 240; extending the tool body 1 of the second boring tool into the fifth camshaft hole 250, guiding the first guide bar 3 of the second boring tool through the fifth camshaft hole 250, guiding the second guide bar 4 of the second boring tool through the fourth camshaft hole 240, and making the tool 2 of the second boring tool machine the fifth camshaft hole 250.

[0088] When machining the first camshaft hole 210, the mounting portion 11 is mounted on the machine tool to realize the connection between the machine tool and the mounting portion 11. The boring tool 100 is close to the first camshaft hole 210, and the first guide bar 3 is extended into the first camshaft hole 200 to guide the tool 2. When the tool 2 is just extended into the first camshaft hole 210 to machine the first camshaft hole 210, part of the first guide bar 3 is located in the first camshaft hole 210, and the other part of the first guide bar 3 is located in the second camshaft hole 220 to guide the tool body 1, thereby guiding the tool 2. When the tool 2 machines the first camshaft hole 210, part of the first guide bar 3 is located in the first camshaft hole 210, and when the tool 2 completes the machining of the first camshaft hole 210, the first guide bar 3 is separated from the first camshaft hole 210.

[0089] When the second gear camshaft hole 220 is being machined, when the cutter 2 just extends into the second gear camshaft hole 220 to machine the second gear camshaft hole 220, a part of the first guide strip 3 is located in the second gear camshaft hole 220, another part of the first guide strip 3 is located in the third gear camshaft hole 230, and a part of the second guide strip 4 is located in the first gear camshaft hole 210 to guide the cutter body 1, thereby guiding the cutter 2. When the cutter 2 machines the second gear camshaft hole 220 for a distance, a part of the first guide strip 3 is located in the second gear camshaft hole 220, a part of the second guide strip 4 is located in the second gear camshaft hole 220, and another part of the second guide strip 4 is located in the first gear camshaft hole 210. When the cutter 2 completes machining of the second gear camshaft hole 220, the first guide strip 3 is separated from the second gear camshaft hole 220.

[0090] When the third gear camshaft hole 230 is being machined, when the cutter 2 just extends into the third gear camshaft hole 230 to machine the third gear camshaft hole 230, a part of the first guide strip 3 is located in the third gear camshaft hole 230, another part of the first guide strip 3 is located in the fourth gear camshaft hole 240, and a part of the second guide strip 4 is located in the second gear camshaft hole 220 to guide the cutter body 1, thereby guiding the cutter 2. When the cutter 2 machines the third gear camshaft hole 230 for a distance, a part of the first guide strip 3 is located in the third gear camshaft hole 230, a part of the second guide strip 4 is located in the third gear camshaft hole 230, and another part of the second guide strip 4 is located in the second gear camshaft hole 220. When the cutter 2 completes machining of the third gear camshaft hole 230, the first guide strip 3 is separated from the third gear camshaft hole 230.

[0091] When the fourth gear camshaft hole 240 is being machined, when the cutter 2 just extends into the fourth gear camshaft hole 240 to machine the fourth gear camshaft hole 240, a part of the first guide strip 3 is located in the fourth gear camshaft hole 240, another part of the first guide strip 3 is located in the fifth gear camshaft hole 250, and a part of the second guide strip 4 is located in the third gear camshaft hole 230 to guide the cutter body 1, thereby guiding the cutter 2. When the cutter 2 machines the fourth gear camshaft hole 240 for a distance, a part of the first guide strip 3 is located in the fourth gear camshaft hole 240, a part of the second guide strip 4 is located in the fourth gear camshaft hole 240, and another part of the second guide strip 4 is located in the third gear camshaft hole 230. When the cutter 2 completes machining of the fourth gear camshaft hole 240, the first guide strip 3 is separated from the fourth gear camshaft hole 240.

[0092] When the fifth gear camshaft hole 250 is machined, when the cutter 2 just extends into the fifth gear camshaft hole 250 to machine the fifth gear camshaft hole 250, a part of the first guide bar 3 is located in the fifth gear camshaft hole 250, and a part of the second guide bar 4 is located in the fourth gear camshaft hole 240 to guide the cutter body 1, thereby guiding the cutter 2. When the cutter 2 machines the fifth gear camshaft hole 250, a part of the first guide bar 3 is located in the fifth gear camshaft hole 250, a part of the second guide bar 4 is located in the fifth gear camshaft hole 250, and another part of the second guide bar 4 is located in the fourth gear camshaft hole 240. When the cutter 2 finishes machining the fifth gear camshaft hole 250, the first guide bar 3 is separated from the fifth gear camshaft hole 250.

[0093] When the camshaft hole 200 is machined, the first guide bar 3 is located on one side of the cutter 2 and guides the cutter body 1 to guide the cutter 2, and the second guide bar 4 is located on the other side of the cutter 2 and guides the cutter body 1 to guide the cutter 2. By arranging the first guide bar 3 and the second guide bar 4 on both sides of the cutter 2, the first guide bar 3 and the second guide bar 4 can maintain the cutter body 1 and the cutter 2 in a stable state under smaller stress, so that the cutter 2 can withstand greater force while the cutter 2 and the cutter body 1 remain stable, thereby avoiding vibration of the cutter body 1 and the cutter 2, and thus avoiding vibration marks on the camshaft hole 200. Moreover, since the cutter 2 can withstand greater force while the cutter 2 and the cutter body 1 remain stable, the cutter 2 can provide greater boring force to the camshaft hole 200, so that the boring cutter 100 of the embodiment has higher machining precision when machining the vermiculite, thereby meeting the machining precision requirement that the adjacent camshaft holes 200 have a runout value of less than or equal to 0.02 mm.

[0094] In some embodiments, the camshaft hole machining method further comprises: before the cutter 2 of the first boring cutter 100 machines the first gear camshaft hole 210, adjusting the first boring cutter 100 to make the runout value of the first guide bar 3 less than or equal to 0.003 mm, so as to improve the machining precision of the cutter 2, thereby meeting the machining precision requirement that the adjacent camshaft holes 200 have a runout value of less than or equal to 0.02 mm.

[0095] In some embodiments, the camshaft hole machining method further comprises: before the cutter 2 of the second boring cutter 100 machines the second gear camshaft hole 220, adjusting the second boring cutter 100 to make the runout value of the first guide bar 3 and the runout value of the second guide bar 4 both less than or equal to 0.003 mm, so as to improve the machining precision of the cutter 2, thereby meeting the machining precision requirement that the adjacent camshaft holes 200 have a runout value of less than or equal to 0.02 mm.

[0096] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical scope disclosed by the present application, which can be easily thought by those skilled in the art, should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for machining a camshaft hole, characterized in that, The camshaft hole is machined using a first boring tool and a second boring tool. The first boring tool includes a tool body, a cutting tool, and a first guide bar. One end of the tool body is provided with a mounting portion suitable for connection with a machine tool. The cutting tool is disposed on the tool body. The first guide bar is disposed on the tool body, and the extension direction of the first guide bar is consistent with the extension direction of the tool body. The cutting tool is located between the mounting portion and the first guide bar in the extension direction of the tool body. The second boring bar includes a tool body, a cutting tool, a first guide bar, and a second guide bar. One end of the tool body is provided with a mounting portion suitable for connection with a machine tool. The cutting tool is disposed on the tool body and spaced apart from the mounting portion along the extension direction of the tool body. The first guide bar is disposed on the tool body, and the extension direction of the first guide bar is consistent with the extension direction of the tool body. The first guide bar is located on the side of the cutting tool away from the mounting portion and is adapted to be guided by a camshaft hole. The second guide bar is disposed on the tool body, and the extension direction of the second guide bar is consistent with the extension direction of the tool body. The second guide bar is located between the mounting portion and the cutting tool and is adapted to be guided by the camshaft hole. The camshaft hole machining method includes: The tool body of the first boring bar is inserted into the first camshaft hole, and the first guide bar is guided through the first camshaft hole and the second camshaft hole, and the tool of the first boring bar is used to process the first camshaft hole. After completing the machining of the first camshaft hole, the first boring tool is switched to the second boring tool; The tool body of the second boring tool is inserted into the second camshaft hole, and the first guide bar of the second boring tool is guided through the second camshaft hole and the third camshaft hole. The second guide bar of the second boring tool is guided through the first camshaft hole, and the tool of the second boring tool is made to process the second camshaft hole. The tool body of the second boring tool is inserted into the third camshaft hole, and the first guide bar of the second boring tool is guided through the third and fourth camshaft holes. The second guide bar of the second boring tool is guided through the second camshaft hole, and the tool of the second boring tool is machined in the third camshaft hole. The tool body of the second boring tool is inserted into the fourth camshaft hole, and the first guide bar of the second boring tool is guided through the fourth and fifth camshaft holes. The second guide bar of the second boring tool is guided through the third camshaft hole, and the tool of the second boring tool processes the fourth camshaft hole. The tool body of the second boring tool is inserted into the fifth camshaft hole, the first guide bar of the second boring tool is guided through the fifth camshaft hole, the second guide bar of the second boring tool is guided through the fourth camshaft hole, and the tool of the second boring tool is made to machine the fifth camshaft hole.

2. The camshaft hole machining method according to claim 1, characterized in that, The length of the first guide bar of the second boring tool is configured to be greater than the distance between adjacent camshaft holes; and / or, The length of the second guide bar of the second boring tool is configured to be greater than the distance between adjacent camshaft holes.

3. The camshaft hole machining method according to claim 2, characterized in that, The dimension of the first guide bar of the second boring tool in the radial direction of the tool body is smaller than the dimension of the second guide bar of the second boring tool in the radial direction of the tool body.

4. The camshaft hole machining method according to claim 2 or 3, characterized in that, The second boring tool has multiple first guide bars, and the multiple first guide bars of the second boring tool are spaced apart along the circumferential direction of the tool body; The second guide bar of the second boring tool is provided in multiple ways, and the second guide bars of the multiple second boring tools are arranged at intervals along the circumferential direction of the tool body.

5. The camshaft hole machining method according to claim 4, characterized in that, In the second boring tool, a plurality of first guide bars are arranged in a one-to-one correspondence with a plurality of second guide bars in the extension direction of the tool body, and the cutting tool is located between adjacent first guide bars in the circumferential direction of the tool body.

6. The camshaft hole machining method according to claim 1, characterized in that, The camshaft hole machining method further includes: Before the first boring tool processes the first camshaft hole, the first boring tool is adjusted so that the runout of the first guide bar is less than or equal to 0.003 mm.

7. The camshaft hole machining method according to claim 1, characterized in that, The camshaft hole machining method further includes: Before the second boring tool processes the second camshaft hole, the second boring tool is adjusted so that the runout values ​​of the first guide bar and the second guide bar are both less than or equal to 0.003 mm.

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