WO2007077880A1

WO2007077880A1 - Method for manufacturing shaft member connected to a sintered part and internal combustion engine cam shaft

Info

Publication number: WO2007077880A1
Application number: PCT/JP2006/326084
Authority: WO
Inventors: Takeshi Kuwahara; Atsuya Aoki; Masahiro Shinzawa; Hiroshi Takiguchi
Original assignee: Nippon Piston Ring Co., Ltd.
Priority date: 2005-12-28
Filing date: 2006-12-27
Publication date: 2007-07-12
Also published as: KR20080066079A; US20100224146A1; JPWO2007077880A1

Abstract

Provided is a simple method for manufacturing a shaft member connected to a sintered part with a high positional accuracy and angle accuracy and with a high yield. By compressing and molding a metal power or an alloy power into a pressed powder body. When assembling the pressed powder body to the shaft member, a protrusion formed on the outer circumference of the shaft member is used so that a part of the pressed powder body is shaved away by the protrusion and the protrusion comes into the pressed powder body. Thus, the pressed powder body and the shaft member are assembled and then sintering is performed.

Description

Method for manufacturing shaft member joined with sintered parts, and camshaft for internal combustion engine

Technical field

[0001] The present invention relates to a method of manufacturing a shaft member to which sintered parts are joined. Specifically, for example, the present invention relates to a manufacturing method applicable when manufacturing a so-called assembly camshaft.

Background art

[0002] For example, a camshaft used in an internal combustion engine such as an automobile engine is formed by compressing a metal or alloy powder into a cam lobe shape, assembling the powder into a shaft as a shaft member, and then sintering the cam lobe. And the shaft are integrated by sintered diffusion bonding.

[0003] In manufacturing such a so-called assembled camshaft, it is necessary to perform sintering while fixing a cam lobe as a sintered part to a predetermined position of a shaft as a shaft member at a predetermined angle. In the past, various fixing methods have been developed.

[0004] For example, in Patent Document 1 and Patent Document 2, a recess (groove) is formed on the outer peripheral surface of a shaft as a shaft member.

On the other hand, it is disclosed that a convex portion corresponding to the concave portion is provided on the cam lobe side.

[0005] Further, Patent Document 3 discloses that a concave portion is provided on both the outer peripheral surface of the shaft and the cam lobe, and both are fixed by inserting a pin into a gap formed by the two concave portions. Has been.

[0006] Further, Patent Document 4 discloses that a protrusion is formed by pressing a punch on the outer peripheral surface of the shaft, and the cam lobe and the shaft are temporarily fixed using the protrusion.

Patent Document 1: Japanese Patent Laid-Open No. 54-041266

Patent Document 2: Japanese Patent Application Laid-Open No. 60-0333302

Patent Document 3: Japanese Patent Laid-Open No. 08-210110

Patent Document 4: Japanese Patent Laid-Open No. 03-168305 Disclosure of the invention

Problems to be solved by the invention

[0007] However, in the methods disclosed in Patent Document 1 and Patent Document 2, it is necessary to form concave portions and convex portions that are not necessary for the function of the original camshaft. There was a case where the degree of freedom decreased. In particular, when a concave portion (that is, a groove) that is continuous in the axial direction is formed on the outer peripheral surface of the shaft, there is often a gap between the portion where the concave portion is formed and the cam lobe. There was also.

[0008] Also, even in the method disclosed in Patent Document 3, it is necessary to form a recess as in Patent Document 1, so that the degree of freedom in design decreases and the strength decreases. In addition to problems, pin members are required in addition to cam lobes and shafts, which complicates the manufacturing process, reduces yields, and increases production costs.

[0009] Furthermore, in the method disclosed in Patent Document 4, the joining method of the cam lobe and the shaft is welding joining, and there is no consideration for joining by sintered diffusion joining as in the present invention. It is an invention. Here, when the contents of Patent Document 4 are examined, it is described that the protrusion formed by the punch is crushed and deformed by the cam lobe when the cam lobe is inserted. Judging from this descriptive power, it is clear that the cam lobe is not a green compact obtained by compression molding a metal or alloy powder as in the present invention. Considering the hardness of the cam lobe and the shaft, the cam lobe is harder. It is clear. Furthermore, according to the description in Patent Document 4, since the protrusion is already crushed and lost at the stage where the cam lobe is inserted into the camshaft, the cam lobe is no longer fixed to the shaft at this stage. Or even if it is fixed, it is weak. In this situation, when the sintering process is performed as in the present invention, the cam lobe may rotate, and it is considered impossible to accurately fix the cam lobe at a desired angle.

The present invention has been made to solve such problems, and is a method for manufacturing a shaft member joined with sintered parts, which is simple, has a good yield, and has good positional accuracy and angular accuracy. And a camshaft for an internal combustion engine manufactured by the manufacturing method.

Means for solving the problem [0011] The present invention for solving the above problems includes a green compact forming step of forming a green compact by compression molding a metal or alloy powder, and a desired position on the outer peripheral surface of the shaft member. By pressing with a jig, the outer peripheral surface of the shaft member is deformed to form a convex portion having a height of 0.03 to 0.25 mm at the position, and formed on the outer peripheral surface of the shaft member. An assembling step of assembling the green compact and the shaft member by using the raised convex portion and cutting the green compact with the convex portion while allowing the convex portion to bite into the green compact. A sintering process in which the green compact is sintered to integrate the green compact and the shaft member by sintering diffusion bonding, and also has a force. This is a manufacturing method.

[0012] In the invention, after the assembly process, before the sintering process, a temporary fixing process of temporarily fixing the green compact and the shaft member with an adhesive may be performed. .

Furthermore, in the invention, the sintered part can be a cam lobe or a cam lobe and a journal, and the shaft member can be a shaft.

[0014] Furthermore, the present invention for solving the above-mentioned problems is a camshaft for an internal combustion engine characterized by being formed by a method for manufacturing a shaft member.

The invention's effect

[0015] According to the present invention, a green compact formed using a metal or alloy powder is placed on a shaft member, and is sintered to be integrated by sintering diffusion bonding. In the method of manufacturing a shaft member to which components are joined, a fine convex portion is formed on the surface of the shaft member before the green compact is placed on the shaft member, and this is used to form the green compact and the compact. Since the shaft member is assembled and fixed, as in Patent Documents 1 and 2, the green compact (the force mulob in Patent Documents 1 and 2) and the shaft member (the shaft in Patent Documents 1 and 2) Since it is sufficient to process only the shaft member that does not need to be processed on both sides, the yield can be improved and the degree of freedom in design can also be improved. Further, the processing for the shaft member performed in the manufacturing method of the present invention is only to form a fine convex portion by pressing a jig on the surface, and finally the convex portion is a green compact. Therefore, as in Patent Documents 1 and 2, there is no possibility that the strength is reduced by the processing.

[0016] In such a manufacturing method of the present invention, a pin as described in Patent Document 3 is used. Since a separate member typified by is unnecessary, the cost can be reduced.

[0017] Further, in the manufacturing method of the present invention, the shaft member and the green compact are assembled and fixed by biting the fine convex portions formed on the outer peripheral surface of the shaft member into the green compact. Therefore, as described in Patent Document 4, there is no possibility that the green compact is displaced in the axial direction or rotated in the circumferential direction after assembly, as a result, the positional accuracy, The angle accuracy can be improved.

[0018] Also, in the conventional method, when a groove is formed on the shaft and a protrusion is formed on the cam lobe, and fitting and sintering are performed, only the cam lobe contracts during sintering, so the clearance increases and the angle increases. On the other hand, in the present invention, since the convex portion is formed on the shaft side, the cam lobe embraces the convex portion due to the shrinkage of the cam lobe (green compact) during sintering. Accuracy is improved.

Brief Description of Drawings

FIG. 1 is a flowchart showing the steps of a production method of the present invention.

FIG. 2 is an explanatory diagram for explaining a convex portion forming step in the manufacturing method of the present invention, (a) is a schematic cross-sectional view showing the procedure of the step, and FIG. It is an expanded sectional view of the outer peripheral surface of the formed shaft.

FIG. 3 is an explanatory diagram for explaining an assembly process in the manufacturing method of the present invention. Explanation of symbols

[0020] 20 · "Shaft

21 ... Jig

22 ... convex

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the production method of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a flowchart showing the steps of the production method of the present invention.

[0023] It should be noted that the present invention is not limited to the method of manufacturing the camshaft, and can be applied to the manufacture of general articles that are formed by integrating sintered parts and shaft members by sintering diffusion bonding. In order to explain more concretely, an example of manufacturing a loosely assembled camshaft, in which sintered parts such as cam lobes and journals separately manufactured on the shaft are assembled. In the following description, the sintered part is a cam lobe and the shaft member is a shaft.

As shown in FIG. 1, the manufacturing method of the present invention includes a green compact forming step S 1 for forming a green compact by compressing metal or alloy powder, and a desired outer peripheral surface of the shaft member. The assembly of assembling the convex portion and the shaft member together with the convex portion forming step S2 that deforms the outer peripheral surface of the shaft member by pressing the position of the portion with a jig to form a fine convex portion at the position. Attaching step S3, temporary fixing step S4 for temporarily fixing the green compact and the shaft member with an adhesive, and sintering the green compact so that the green compact and the shaft member are bonded by sintering diffusion bonding. The integrated sintering process S5 and force are also configured.

[0025] Each step will be specifically described below.

[0026] (1) Green compact forming process

The objective of the green compact forming step S1 in the production method of the present invention is to form a green compact by compressing and molding a metal or alloy powder. The shape of the green compact is not particularly limited, and may be appropriately designed in consideration of the shape of the final molded product. For example, when manufacturing a camshaft, the green compact is a force mlob. The shape will be exhibited.

[0027] The metal or alloy powder used in the step S1 is not particularly limited, and any conventionally known metal or alloy powder can be used. It is preferable to use, for example, a stainless alloy powder such that the shrinkage ratio of the body ((green compact size, sintered compact size) Z green compact size X 100) is 4 to 7%.

[0028] The green compact formed in the step S1 has a convex portion formed on a shaft member (for example, a shaft) bite in an assembly step S3 to be described later. Since a moderate load is applied, it is necessary to have a hardness that can withstand the load received in the assembly step S3. Specifically, it is preferable to set the relative density of the green compact to be 70% or more, preferably forming a green compact by applying a pressure of about 440 to 690 MPa.

[0029] (2) Convex formation process

The convex forming step S2 in the manufacturing method of the present invention deforms the outer peripheral surface of the shaft member by pressing a desired position on the outer peripheral surface of the shaft member using a jig, It aims at forming a fine convex part.

FIG. 2 is an explanatory diagram for explaining the convex portion forming step S2, (a) is a schematic cross-sectional view showing the procedure of the step, and FIG. 2 (b) is a diagram in which the convex portion is formed. FIG. 3 is an enlarged sectional view of the outer peripheral surface of the shaft.

As shown in FIG. 2 (a), in this step, a desired position on the outer peripheral surface of the shaft 20 as a shaft member is pressed using a jig 21. After the end of the process, as shown in FIG. 2 (b), the outer peripheral surface of the shaft 20 is deformed, and a fine convex portion 22 is formed at the position.

[0032] The fine protrusions 22 are used in assembling the cam lobe-shaped green compact and the shaft 20 in an assembling step S3 described later.

[0033] The height h of the fine convex portion 22 is not limited as long as the convex portion 22 can fix the green compact by biting into the above-described green compact in the assembly step S3 described later. If the height is high enough to achieve this, it can be set appropriately. However, if the pressure is set higher than necessary, there is a risk that it may become an obstacle when assembling the green compact. At the same time, the green compact may be crushed by applying an excessive load to the green compact during assembly. This is not preferable because it may cause Further, if the convex part is made higher than necessary, the load becomes high, so that the life of the jig is reduced, the convex part forming load is increased, and the equipment load is increased due to the increased press-fitting load during assembly. This is not preferable. Specifically, the height of the convex portion is preferably about 0.03 to 0.25 mm. Particularly preferred is about 0.03 to 0.2 mm when forming three convex portions, and about 0.05 to 0.2 mm when forming two convex portions. When forming 5 locations, it is about 0.03 to 0.1 mm

[0034] On the other hand, the concave portion 23 inevitably formed to form the fine convex portion 22 is not used in the manufacturing method of the present invention, and therefore its shape (depth and size) is There is no particular limitation. However, the concave portion 23 is preferably as small as possible, and for that purpose, it is preferable to devise the shape of the tip of the jig 21.

[0035] The jig 21 used in the method of the present invention is not particularly limited as long as it can efficiently form the fine protrusions 22 described above, and can be appropriately selected. Is possible. Specifically, for example, it is preferable that the tip has a conical shape, and the angle is preferably about 40 to 80 °. In addition, it is preferable that R (curvature radius) of the tip of the cone is 1 mm or less, and it is particularly preferable that it is about 0.05 to 0.5 mm. If the cone angle is less than 40 °, the life of the jig 21 may be shortened. On the other hand, if the cone angle is more than 80 °, it may be difficult to obtain an appropriate convex portion 22. Further, if the R force Slmm is larger than the tip, it is difficult to form an appropriate convex portion 22, and the pressure for pressing the jig 21 increases.

[0036] Also, the hardness of the jig 21 is preferably equal to or higher than the hardness of the shaft as the shaft member in order to carry out the method of the present invention. If you use high speed tool steel, etc.

[0037] On the other hand, for example, the hardness of a shaft member typified by a shaft can be appropriately set according to the application of the final product manufactured by the manufacturing method of the present invention and the required performance. As described above, since it is necessary to form the fine convex portion 22 and use the formed convex portion 22 to bite into the green compact, it is necessary to have a certain degree of hardness. is there. Specifically, for example, in the case of a shaft for a camshaft, the surface hardness is preferably about HRB 75 to 105. If the surface hardness is less than HRB75, it may be difficult to form the convex portion 22 having the desired height h even if the jig 21 is pressed. On the other hand, if the surface hardness is greater than HRB105, the jig 21 This is because the lifespan of the product is reduced. Examples of the material having such a hardness include S45C, STKM13, and Sarako, SUJ2 material.

[0038] In the step S2, the pressure when pressing the jig 21 against the surface of the shaft 20 takes into account the balance such as the hardness of the jig 21 and the hardness of the shaft 20, as described above. There is no particular limitation as long as it is set to such an extent that a convex portion 22 having a height h can be formed. For example, it is preferably about 490-2450N. If the pressure is smaller than 490N, the height h of the convex portion may not be set to a desired value.On the other hand, if it exceeds 2450N, the depth of the unnecessary concave portion 23 becomes deeper, and the thickness of the shaft 20 depends on the thickness. This is because the entire shaft may be deformed.

[0039] In the step S2, at least one convex portion 22 is provided for one green compact. The number to be formed is not particularly limited, and about five may be formed. For example, when the method of the present invention is applied to the manufacture of an assembled camshaft, and when one convex portion 22 is formed for one cam lobe, the convex portion 22 is a nose in the cam lobe. It is preferable to provide at a position corresponding to the portion (the thickest portion) (an angle with respect to the circumferential direction of the shaft). On the other hand, when two convex portions 22 are formed for one cam lobe, the convex portion 22 has a position of 0 to + 35 ° from the position corresponding to the nose portion of the cam lobe, and 0 It is preferable to provide at a position of ˜35 °, and a position of 25 ± 7 °, a position of 25 ± 7 ° is more preferable, and a position of 25 ± 7 ° is particularly preferable. In the case of forming three convex portions, the force provided at the position of 0 to + 35 °, the position of 0 °, and the position of 0 to 35 ° from the position corresponding to the nose portion in the cam lobe, or From the position corresponding to the nose portion, it is preferable to provide at a position of 0 to + 35 °, a position of + 180 °, and a position of 0 to 135 °. Furthermore, in the case of forming four convex portions, from the position corresponding to the nose portion in the force mulob, the position of 0 to + 35 °, the position of 0 °, the position of 0 to 1 35 °, It is preferable to provide at a position of + 180 °. Furthermore, in the case of forming five convex portions, from the position corresponding to the nose portion in the cam lobe, a position of 0 to + 35 °, a position of 0 °, a position of 0 to 1 35 °, and + Position at 150 °, force at 150 ° position 0 to + 35 ° position, 180 ° position, 0 to 35 ° position, + 1 50 ° position, and −150 ° position It is preferable to provide in.

[0040] It should be noted that the position angle for forming the convex portion does not require high accuracy. When the method of the present invention is applied to the manufacture of the assembly camshaft, the number and position of the projections formed on the shaft member are preferably the combination of the number and position described above. When integrally manufacturing by sintered diffusion bonding, it is not particularly limited as long as it is provided in consideration of the shape and strength of the green compact.

[0041] (3) Assembly process

The assembling step S3 in the manufacturing method of the present invention uses the convex portion formed on the outer peripheral surface of the shaft member, and the convex portion bites into the green compact while scraping a part of the green compact with the convex portion. Accordingly, an object is to assemble the green compact and the shaft member.

FIG. 3 is an explanatory diagram for explaining the assembly step S3. In the step S3, as shown in FIGS. 3 (a) and 3 (b), a cam lobe-shaped pressure is applied from one end of the shaft 20 on which the fine convex portions are formed by the convex portion forming step S2. Assembling is carried out by inserting the powder and biting the convex portion 22 while scraping the inner surface of the shaft insertion hole formed in the green compact with the fine convex portion. At this time, since the green compact is elastically deformed, there is no deviation in the insertion direction or in the opposite direction after the green compact is inserted.

[0044] In this way, the green compact can be obtained with higher accuracy than in the past by causing the convex portions formed on the shaft member (shaft) to bite into the green compact while scraping part of the green compact (cam lobe). Can be fixed to the shaft member.

[0045] In this case, it is preferable that the convex portion 22 is bitten to about 1Z2 of the thickness W in the width direction (insertion direction) of the green compact. However, if the thickness W in the width direction of the green compact exceeds 20 mm, it is preferable to set the insertion amount to about 10 mm! /.

[0046] Further, regarding the clearance (gap) between the green compact (cam lobe) and the shaft member (shaft), the height h of the convex portion 22 formed on the outer peripheral surface of the shaft member in the convex portion forming step S2 is as follows. A force that can be appropriately set depending on the size, for example, a diameter of about 0.05 to 0.2 mm is preferable. If the clearance is less than 0.05 mm in diameter, it may be difficult to insert the green compact itself, resulting in a decrease in yield. On the other hand, if the clearance is larger than 0.2 mm in diameter, This is the force that makes the protrusion 22 shallow and makes it difficult to fix. From the same point of view, it is preferable to set the clearance so that the convex part 22 of the shaft member digs into the green compact by more than 0. Olmm.

[0047] FIGS. 3 (c) and 3 (d) show the procedure of the assembling step S3 when a plurality of cam lobes are fixed to the shaft, for example. As shown in the drawing, when a plurality of cam lobes are fixed, it is preferable to repeatedly perform the above-described protrusion forming step S2 and the assembling step S3. When the convex forming step S2 is performed continuously, the cam lobe passes through the convex portion formed on the front side when inserting the cam lobe at one end of the shaft. At this time, a part of the cam lobe is scraped unnecessarily. This is because there may be a problem in strength.

[0048] (4) Temporary fixing process

The temporary fixing S4 in the manufacturing method of the present invention is a shaft member (shaft) in the assembly step S3. The purpose of this is to temporarily fix the green compact (cam lobe) assembled to the base prior to the sintering process.

[0049] The step S4 is not an essential step in the production method of the present invention, but is preferably performed to improve accuracy! /.

[0050] As can be seen from the description of the assembling step S3, in the method of the present invention, the attaching step is performed while scraping a part of the green compact with the convex portion formed on the shaft member. While the displacement of the green compact in the insertion direction is unlikely to occur, fixing in the direction opposite to the green compact insertion direction (that is, the direction in which the green compact is returned) may be weaker than that in the insertion direction. Conceivable. However, this is a case where both are compared, and since the convex part bites into the green compact due to the elastic deformation of the green compact, it is fixed even in the direction opposite to the insertion direction. . In consideration of such a case, it is preferable to perform the temporary fixing step when higher accuracy is desired.

[0051] With respect to the specific means of the step S4, the method of the present invention is not particularly limited. Various methods have been used in the past, such as manufacturing methods of assembly camshafts. Any means can be selected and used. For example, an adhesive may be applied to the joint portion between the shaft member and the green compact. Examples of the adhesive used in this case include an alpha acrylate system.

(5) Sintering process

The sintering step S5 in the manufacturing method of the present invention is performed by sintering the green compact (cam lobe) assembled to the shaft member (shaft) and temporarily fixed as necessary. The object is to integrate the material with sintered diffusion bonding.

[0052] The step S5 is the same as a conventionally known sintering step, and is not particularly limited to the production process of the present invention! /.

[0053] Specifically, for example, it is preferable to sinter at 1100 to 1200 ° C, and the time varies depending on the size of the product to be manufactured and the type of metal or alloy powder used. Approximately 0.5 to 2 hours is preferred. Sintering at 1200 ° C or higher is not preferred because it may cause excessive deformation or cause fine “blowing”.

[0054] In addition, the shrinkage rate power of the green compact in the sintering process is preferably about 7%. If the amount is less than this, diffusion bonding may be insufficient.

Example

[0055] The production method of the present invention will be described more specifically with reference to examples.

[Example 1]

Ten camshafts (one cam lobe per shaft) were manufactured by the manufacturing method of the present invention shown in FIG. These are designated as sample Nos. 1-10.

[0057] The position and height of each protrusion formed on the shaft of each sample are as shown in Table 1 below. Samples Nos. 1 to 4 have two convex parts, Samples Nos. 5 to 7 have three convex parts, and Samples Nos. 8 to 10 have five convex parts.

[0058] Fe-8Cr- 1. 9Ni-2Mo- 2.7C was used as the alloy powder, and the shaft was S

TKM 13 material cold bow I I used a punched pipe.

[0059] The material of the tip of the jig was diamond, and the shape of the tip was a conical shape with a cone angle of 60 ° and a cone tip of R = 0.2 mm.

[0060] In the manufactured camshaft, the position of the cam lobe in the circumferential direction of the cam lobe after the temporary fixing process is 0 °, and the cam lobe position after the sintering process is the position of the cam lobe after the temporary fixing process ( 0 °) force The number of deviations was measured for each sample. Note that the clockwise direction is positive (+), and the counterclockwise direction is negative (-), considering the force in the insertion direction of the force mlob.

[0061] The results are shown in Table 1 below.

[0062] (Comparative Example 1)

Two camshafts were manufactured by the same method as in the above example, except that the size of the convex portion was outside the range of the manufacturing method of the present invention. These are designated as sample Nos. 11-12.

[0063] The measurement results of the sample are shown in Table 1 below as in the above examples.

[0064] (Conventional example 1)

Three camshafts (one cam lobe for each shaft) were manufactured by a conventionally known assembly camshaft manufacturing method. These are designated as sample Nos. 13-15.

[0065] The conditions of the alloy powder, the shaft, and the like were the same as in the previous example.

[0066] Further, a conventionally known method for manufacturing an assembled camshaft is, specifically, on the outer periphery of the shaft. A groove extending in the axial direction is formed. On the other hand, a protrusion is formed on the inner peripheral surface of the cam lobe to be joined to this shaft, and the cam lobe is fitted to the shaft by matching the protrusion and the groove, and then sintered. This is a method of joining the cam lobe to the shaft (see FIGS. 1 to 3 of the aforementioned Patent Document 2).

[0067] The results of the same evaluation as in Example 1 are shown in Table 1 below.

[0068] [Table 1]

[0069] (Contrast of Example 1, Comparative Example 1 and Conventional Example 1)

As is clear from Table 1 above, the method of the present invention has a very small deviation from the cam lobe position (0 °) after completion of the temporary fixing process, compared with the comparative example and the conventional example. The high was a part of it.

[0070] In particular, when Sample No. 8 in the example in which the height of the convex part is 0.03 and Sample No. 12 in the comparative example in which the height of the convex part is 0.02 are compared, the deviation angle is It can be seen that it is effective to determine the height of the convex portion within the range of the present invention.

Claims

The scope of the claims

[1] a green compact forming step of forming a green compact by compressing metal or alloy powder;

A convex part that deforms the outer peripheral surface of the shaft member by pressing a desired position on the outer peripheral surface of the shaft member with a jig to form a convex part having a height of 0.03-0.25 mm at the position. Forming process,

By utilizing the convex portion formed on the outer peripheral surface of the shaft member, the convex portion and the shaft are bitten into the green compact while the convex portion is scraped off by the convex portion. An assembly process for assembling the components,

Sintering the green compact to sinter the green compact and the shaft member together by sintering diffusion bonding;

The manufacturing method of the shaft member to which the sintered component was joined characterized by comprising.

[2] The temporary fixing step of temporarily fixing the green compact and the shaft member with an adhesive after the assembly step and before the sintering step is performed. A method for manufacturing a shaft member to which sintered parts are joined.

[3] The method for manufacturing a shaft member to which the sintered component is bonded according to any one of [1] to [1] or [2], wherein the sintered component is a cam lobe and the shaft member is a shaft.

[4] An internal combustion engine camshaft formed by the shaft member manufacturing method according to any one of claims 1 to 3.