JP5527543B2 - Burnishing method - Google Patents

Description

  The present invention relates to a burnishing method, and more particularly to a burnishing method capable of optimally setting processing conditions and the like.

  Conventionally, there is burnishing as a surface finishing method for improving wear resistance and fatigue strength of metal products. Burnishing is a method in which the surface of a material is plastically deformed by a tool such as a roller to make the surface unevenness uniform, and the surface hardness of the material is increased by work hardening. Compared with other methods, this method has advantages such as reducing the surface roughness in a short time and improving the hardness of the finished surface (for example, see Patent Document 1).

  For example, in roller burnishing for a cylindrical material, the diameter between the rollers is called a tool diameter, and the difference between the diameter of the cylindrical material before the burnishing and the tool diameter is called a burnishing amount (or burnishing amount). When carrying out roller burnishing processing, the processing conditions such as burnishing amount, roller rotation speed, roller feed speed, etc. must be adjusted as appropriate in accordance with the dimensions and surface roughness of the material required after processing. Don't be. Conventionally, these settings are manually performed by an expert.

JP 2009-220225 A

  However, the conventional condition setting for burnishing by an expert has a problem of cost and time. In addition, the inventors have learned that the amount of dimensional change due to burnishing and the surface roughness after burnishing change depending on the surface roughness of the metal product before burnishing, and the optimum burnishing There is a problem that it is difficult to set processing conditions even for an expert.

  The present invention has been devised in view of the above-described problems, and an object thereof is to provide a burnishing method capable of setting burnishing conditions easily and in a short time.

  According to the present invention, there is provided a burnishing method that performs burnishing by crushing a surface of a metal material with a rotating roller so that the surface roughness value and dimension of the metal material are required surface roughness value and required dimension. A first response curved surface creating step for creating a first response curved surface indicating a relationship between a burnishing amount with respect to a post-processing surface roughness value after burnishing and a pre-processing surface roughness value before burnishing, and the first response curved surface Rotation of the roller with respect to the post-processing surface roughness value with respect to the arbitrary point selection step of selecting a plurality of arbitrary points above, and the burnishing amount and pre-processing surface roughness value of each point selected in the arbitrary point selection step A second response curved surface creating step for creating a second response curved surface showing the relationship between the number and the feed speed, which is the speed at which the roller moves, and a maximum surface roughness value after processing on each second response curved surface. A third response curved surface creating step for creating a third response curved surface showing the relationship between the burnishing amount with respect to the value and the surface roughness value before processing, and burnishing with respect to the minimum value of the surface roughness value after processing on each second response curved surface A fourth response curved surface creating step for creating a fourth response curved surface showing the relationship between the quantity and the surface roughness value before processing, and the space surrounded by the third response curved surface and the fourth response curved surface. A first condition selection step for selecting a burnishing amount and a surface roughness value before processing in which the roughness value is equal to or less than the required surface roughness value, and a burnishing amount and a surface roughness value before processing selected in the first condition selection step. A fifth response surface creating step for creating a fifth response surface showing the relationship between the rotational speed and the feed rate with respect to the surface roughness value after processing, and the surface roughness value after processing for the fifth response surface is the request A second condition selection step for selecting a rotation speed and a feed speed that are equal to or less than the surface roughness value, and the burnishing amount, the surface roughness value before the processing, the rotation speed, and the feed speed with respect to the dimensional change amount before and after the burnishing. Selected from the first condition selection step or the second condition selection step for the second condition of the sixth response surface and the sixth response surface creation step of creating a sixth response surface showing the relationship between the two conditions A third condition calculating step for determining a dimensional change amount by substituting a numerical value, and calculating a value obtained by adding the determined dimensional change amount and the required dimension as a pre-processing dimension of the metal material, and the second condition selecting step The rotational speed and feed speed selected in step 1 and the burnishing amount selected in the first condition selection step, the pre-processing dimensions calculated in the third condition calculation step, and the pre-processing surface roughness selected in the first condition selection step. Value There is provided a burnishing method characterized by comprising a burnishing step for performing burnishing on a metal material.

  The arbitrary point selecting step may be a step of selecting each vertex of the first response surface and an intersection obtained by dividing the inside of the first response surface into a plurality of grids.

  In the first condition selection step, a plane in which the post-processing surface roughness value becomes the required surface roughness value or the required surface roughness value for the space surrounded by the third response curved surface and the fourth response curved surface It may be a step of selecting the barycentric point of the space or the burnishing amount of the central point and the surface roughness value before processing as follows.

  In the second condition selection step, the rotation speed of the center point or the center point of the curved surface whose surface roughness after processing is the required surface roughness value or the required surface roughness value or less for the fifth response curved surface And a step of selecting a feed rate.

  The surface roughness value is, for example, an arithmetic average roughness value or a maximum height roughness value.

  Prior to the first response curved surface creation step, there may be a database creation step of measuring data for creating the first to sixth response curved surfaces and creating a database storing the measured data. .

  Before the burnishing process, the metal material is processed into a material having the pre-process dimension calculated in the third condition calculation process and the pre-process surface roughness value selected in the first condition selection process. You may have a process.

  Further, according to the present invention, there is provided a burnishing method in which a surface roughness value and a dimension of the metal material are changed to a required surface roughness value and a required dimension by performing a burnishing process that crushes the surface of the metal material with a rotating roller. A database including at least a burnishing amount, a pre-processing surface roughness value before burnishing, a rotation speed of the roller, and a feed speed that is a speed at which the roller moves is created for the metal material. Then, based on the data stored in the database, a post-processing surface roughness value after burnishing and a response surface for the dimensional change before and after burnishing are created, and from the response surface, the required surface roughness value and Using the required dimensions, the pre-processing dimension and pre-processing surface roughness value of the metal material, the rotational speed and feed speed of the roller are derived, and the derived addition Relative to the front dimensions and metallic materials with the unmachined surface roughness values, deriving the perform burnishing at a rotational speed and the feed rate was, burnishing wherein the is provided.

  According to the burnishing processing method according to the present invention described above, a response curved surface based on a predetermined parameter can be created, and the burnishing processing conditions can be determined from the response curved surface. Therefore, the burnishing processing conditions can be easily set in a short time. can do. Therefore, it is possible to set conditions for burnishing without depending on a skilled person.

  In addition, by specifying the conditions for burnishing and molding the metal material before burnishing into a shape with a predetermined size and roughness value, the number of burnishing conditions can be set and changed. The burnishing can be performed while maintaining the optimum burnishing conditions, and the stable burnishing can be performed.

It is a schematic diagram for demonstrating the principle of burnishing. It is a figure which shows the burnishing tool used for the burnishing processing method which concerns on embodiment of this invention, (a) is a burnishing amount and a tool diameter, (b) is a rotation speed, (c) is for demonstrating feed speed. FIG. It is a distribution map with respect to the burnishing amount (diameter) of the surface roughness value before processing, and the actual amount of diameter change. It is a schematic diagram of the surface shape before and after the burnishing processing of the metal material, (a) when the surface roughness value Ra before processing is 1 to 3 [μm], (b) is a surface roughness value Ra before processing is 5 The case of 7 [μm] is shown. (A) is a stainless steel, (b) is a titanium alloy alloy burnishing amount and dimensional change response surface surface roughness value to the surface roughness value, (c) is stainless steel, (d) is a titanium alloy burnishing The response curved surface of the surface roughness value after a process with respect to quantity and the surface roughness value before a process is shown. It is a flowchart for demonstrating the burnishing processing method which concerns on embodiment of this invention. It is a schematic diagram which shows the response curved surface used for the burnishing processing method which concerns on embodiment of this invention, (a) is a 1st response curved surface preparation process, (b) is an arbitrary point selection process, (c) is a 2nd response curved surface. (D) is a third response surface creation step and a fourth response surface creation step, (e) and (f) are first condition selection steps, (g) is a fifth response surface creation step, (h) is The second condition selection step, (i) shows the sixth response curved surface creation step. It is a figure which shows the response curved surface used for the burnishing processing method which concerns on other embodiment of this invention, (a) has shown the 1st condition selection process, (b) has shown the 2nd condition selection process.

  Hereinafter, a burnishing method according to an embodiment of the present invention will be described with reference to FIGS. First, the principle of burnishing will be described. Here, FIG. 1 is a schematic diagram for explaining the principle of burnishing. FIG. 2 is a view showing a burnishing tool used in the burnishing method according to the embodiment of the present invention, where (a) is the burnishing amount and tool diameter, (b) is the rotational speed, (c) is the feed speed, It is a figure for demonstrating. FIG. 3 is a distribution diagram of the surface roughness value before processing with respect to the burnishing amount (diameter) and the actual diameter change amount. FIG. 4 is a schematic diagram of the surface shape before and after burnishing of a metal material, where (a) is a surface roughness value Ra before processing of 1 to 3 [μm], and (b) is a surface roughness value before processing. The case where Ra is 5 to 7 [μm] is shown. FIG. 5 shows the response surface of the dimensional change with respect to the burnishing amount and the surface roughness value before processing of (a) stainless steel, (b) titanium alloy, (c) stainless steel, (d) titanium. The response curved surface of the surface roughness value after a process with respect to the burnishing amount of an alloy and the surface roughness value before a process is shown.

  The burnishing is a method in which, for example, the surface of the cylindrical metal material 2 is plastically deformed by the rotating roller 1 to make the surface unevenness uniform, and the surface hardness of the material is increased by work hardening. More specifically, as shown in FIG. 1, in the region a, the roller 1 is pressed against the surface of the metal material 2 and gradually pressed. In the region b, the contact pressure exceeds the yield point of the metal material 2 and causes plastic deformation. In the region c, the roller 1 is separated from the processing surface, and the metal material 2 is elastically recovered by a minute distance Dr. At this time, the surface where the roller 1 has passed is smoothed and the roughness is reduced. Dv in the figure is a distance by which the roller 1 is pressed from the surface of the metal material 2 and is called a burnishing amount (or burnishing amount). On the burnished surface, the hardness increases due to work hardening and the tensile residual stress of the surface layer changes to compressive residual stress. The distance Ds from the surface before the burnishing process to the surface after the burnishing process and the elastic recovery by the distance Dr is referred to as a dimensional change amount.

  As shown in FIG. 2A, the roller 1 is attached to the burnishing tool 3. The burnishing tool 3 can change the burnishing amount Dv by adjusting the tool diameter Dt of the roller 1. Further, as shown in FIGS. 2B and 2C, the burnishing tool 3 is rotated at a rotational speed N [rpm] in order to burn the entire surface of the cylindrical metal material 2 fixed to the milling chuck 4. And reciprocates at a feed rate f [mm / rev].

  There are two processing methods: a method of making the burnishing amount Dv constant and a method of making the tool diameter Dt constant. In the processing by the method of making the burnishing amount Dv constant, the tool diameter Dt is adjusted with respect to the metal material 2, and the processing is performed with the same burnishing amount Dv for all the metal materials 2. Since the processing with the method of making the tool diameter Dt constant is performed without adjusting the tool diameter Dt with the metal material 2, the burnishing amount Dv varies depending on the dimension of the metal material 2.

  When using at the production site, it is not necessary to adjust the tool diameter Dt according to the dimensions of the metal material 2 when machining by the method of making the tool diameter Dt constant. High nature. Therefore, in the present embodiment, the burnishing is performed by keeping the tool diameter Dt constant and changing the burnishing amount Dv.

  Here, as shown in FIG. 3, the metal material 2 has an arithmetic average roughness value (hereinafter referred to as Ra) of 1 to 3 [μm] as a surface roughness value before processing and Ra of 5 to 7 [μm]. The relationship between the burnishing amount (diameter) [mm] in burnishing and the actual diameter change [mm] was investigated. As a result, it was found that the amount of change in diameter increases when the surface roughness value before processing is large. In FIG. 3, data with a surface roughness value Ra before processing of 1 to 3 [μm] is displayed as □, and data with a surface roughness value Ra before processing of 5 to 7 [μm] is displayed as ◆. Yes.

  The burnishing process is a process that smoothes the surface by pressing the roller 1 against the surface of the metal material 2. As shown in FIGS. 4 (a) and 4 (b), it is considered that the crest portion on which the roller 1 is pressed causes plastic flow to the gap in the trough portion. The valley portions on the surface of the metal material 2 of Ra5 to 7 shown in FIG. 4A are wider than those of Ra1 to 3 shown in FIG. Therefore, the dimensional change amount Ds that is the distance between the processed surface S2 of Ra5 to 7 and the preprocessed surface S1 is larger than the dimensional change amount Ds that is the distance between the processed surface S3 of Ra1 to Ra3 and the preprocessed surface S1. Become. Therefore, as shown in FIG. 3, when the surface roughness before processing is large, it is considered that the amount of dimensional change increases.

  As shown in FIGS. 5A and 5B, both the stainless steel (for example, SUS304) and the titanium alloy (for example, Ti-6Al-4V) tend to have larger dimensional change as the surface roughness value before processing increases. I can understand that. Further, when compared in the range of the burnishing amount 3 to 5, even if the same burnishing amount is processed at the same surface roughness value before processing, there is a difference in the dimensional change amount between the stainless steel and the titanium alloy. This is presumed that such a difference appears because the material characteristics are related to the dimensional change after the surface irregularities are completely filled. In the illustrated response surface, the burnishing amount is normalized to 1 to 10, the surface roughness before and after processing is 1 to 5, and the dimensional change amount is normalized to 0 to 10 on the basis of each parameter.

  Further, as shown in FIGS. 5C and 5D, after processing for the stainless steel (for example, SUS304) and the burnishing amount of titanium alloy (for example, Ti-6Al-4V) and the surface roughness value before processing. The response surface of the surface roughness value changes almost in the same manner. It is presumed that this is because the principle of filling the surface irregularities by burnishing is the same regardless of the type of material. According to the illustrated response curved surface, it can be understood that it is composed of a curved surface portion (back side in the figure) having a small effect of improving the processed surface roughness value and a flat surface portion (front side in the figure) having a large improvement effect. Even if the surface roughness value before processing is large, the surface roughness value after processing can be reduced by increasing the burnishing amount. In other words, even after the burnishing amount is constant, the post-processing surface roughness value can be adjusted by adjusting the pre-processing surface roughness value. In the illustrated response surface, the burnishing amount is normalized to 1 to 10, the surface roughness before and after processing is 1 to 5, and the dimensional change amount is normalized to 0 to 10 on the basis of each parameter.

  As described above, as a result of intensive studies, the present inventors have found that the surface roughness value before processing is a parameter that affects the dimensional change amount of the metal material and the surface roughness value after processing. Moreover, as shown in each figure of FIG. 5, it was also able to grasp that the dimensional change amount and the processed surface roughness value have a correlation with the burnishing amount and the processed surface roughness value. The present invention is based on such knowledge, and even when burnishing is performed with a constant tool diameter Dt, a metal material having a dimension that satisfies a desired requirement and a surface roughness after processing is obtained. It is a thing. That is, according to the present invention, the necessary dimensions and surface roughness before burnishing are determined from the dimensions and surface roughness values required after burnishing of the metal material 2, and the burnishing is performed.

  Here, the procedure of the burnishing method according to the embodiment of the present invention will be described. FIG. 6 is a flowchart for explaining the burnishing method according to the embodiment of the present invention. FIG. 7 is a schematic diagram showing a response surface used in the burnishing method according to the embodiment of the present invention, where (a) is a first response surface creation step, (b) is an arbitrary point selection step, (c ) Is the second response surface creation step, (d) is the third response surface creation step and the fourth response surface creation step, (e) and (f) are the first condition selection step, and (g) is the fifth response surface creation step. Step (h) shows a second condition selection step, and (i) shows a sixth response curved surface creation step.

  As shown in FIGS. 6 and 7, the burnishing method according to the embodiment of the present invention performs burnishing by crushing the surface of the metal material 2 with the rotating roller 1, and the surface roughness value of the metal material 2. And a burnishing method for setting the required surface roughness value and the required size, and showing the relationship between the burnishing amount Dv and the surface roughness value before burnishing before the burned surface roughness value after burnishing First response surface creation step (Step 1) for creating first response surface A, arbitrary point selection step (Step 2) for selecting a plurality of arbitrary points P1 to P15 on first response surface A, and arbitrary point selection step Between the rotation speed N of the roller 1 with respect to the post-processing surface roughness value and the feed speed f, which is the speed at which the roller 1 moves, with respect to the burnishing amount Dv and the pre-processing surface roughness value of each of the points P1 to P15 selected by The second response curved surface creation step (Step 3) for creating the second response curved surfaces B (B1 to B15) to be shown, the burnishing amount Dv with respect to the maximum value of the processed surface roughness values in each of the second response curved surfaces B1 to B15, and machining A third response curved surface creation step (Step 4) for creating a third response curved surface Amax showing the relationship with the front surface roughness value, and the burnishing amount for the minimum value of the processed surface roughness values in each of the second response curved surfaces B1-15 A fourth response curved surface creation step (Step 5) for creating a fourth response curved surface Amin indicating the relationship between Dv and the surface roughness value before processing, and a space AR1 surrounded by the third response curved surface Amax and the fourth response curved surface Amin The first condition selection step (Step 6) for selecting the burnishing amount Dv and the surface roughness value before processing that the surface roughness value after processing is equal to or less than the required surface roughness value, and the first item For a burnishing amount Dv and a surface roughness value before processing selected in the selection step, a fifth response surface creation step for creating a fifth response surface C1 indicating the relationship between the rotational speed N and the feed speed f with respect to the surface roughness value after processing ( Step 7), the second condition selection step (Step 8) for selecting the rotation speed N and the feed speed f at which the processed surface roughness value is equal to or less than the required surface roughness value for the fifth response curved surface C1, and dimensions before and after burnishing A sixth response curved surface creating step (Step 9) for creating a sixth response curved surface M indicating the relationship between the burnishing amount Dv, the surface roughness value before processing, the rotational speed N, and the feed speed f with respect to the change amount Ds; The dimensional change amount Ds is determined by substituting the numerical values selected in the first condition selection step or the second condition selection step into the two conditions of the sixth response surface M, and the determined dimensional change amount Ds and the required size are added. Metal value The third condition calculating step (Step 10) calculated as the dimension before processing of the material 2, the rotation speed N and the feed speed f selected in the second condition selecting step, and the burnishing amount Dv selected in the first condition selecting step, And a burnishing step (Step 12) for performing burnishing on the metal material 2 having the pre-processing size calculated in the condition calculation step and the pre-processing surface roughness value selected in the first condition selection step.

  Further, as shown in FIG. 6, before the first response curved surface creation step (Step 1), data for creating the first response curved surface A to the sixth response curved surface M is measured, and the measured data is stored. You may have the database creation process (Step0) which creates the done database.

  The database creation step (Step 0) is performed on, for example, the burnishing amount Dv, the tool diameter Dt, the surface roughness value before processing, the surface roughness value after processing, and the rotation speed of the roller 1 for the metal material 2 having a desired shape. This is a step of acquiring data relating to parameters such as N and feed speed f in advance. A response surface to be described later is created using the numerical values of the parameters stored in this database. Further, when the metal material 2 has a similar material or shape, the data may be calculated by appropriately supplementing the acquired data. In the present embodiment, the surface roughness value means, for example, an arithmetic average roughness value Ra or a maximum height roughness value Rz, and other values such as a ten-point average roughness value, a centerline average roughness value, and the like. The roughness value may be. Each data of these surface roughness values is stored in the database, and the required surface roughness value is any roughness value (for example, arithmetic average roughness value Ra, maximum height roughness value Rz, etc.). Use properly depending on whether there is.

  The first response curved surface creation step (Step 1) is a step of creating a first response curved surface A indicating the relationship between the burnishing amount Dv with respect to the post-processing surface roughness value and the pre-processing surface roughness value before the burnishing processing. Here, it is preferable to select a parameter selected when creating the first response curved surface A from those having a high influence. High influence means that the gradient of the response surface is large. Therefore, the range to be considered when setting the constraint condition becomes narrower than when a parameter having a low influence is selected, and it is possible to easily determine an arbitrary point in the arbitrary point selection step (Step 2). Moreover, when data was acquired about the parameter mentioned above and the factor effect figure was created, it was grasped | ascertained that an influence degree was large in order of surface roughness before a process> burnishing amount Dv> rotation speed N> feed speed f. Therefore, for the creation of the first response curved surface A, the surface roughness before processing and the burnishing amount Dv are selected as parameters.

  Specifically, as shown in FIG. 7A, the burnishing amount Dv (X axis) and the surface roughness value before processing (Y axis) with the surface roughness value after processing (Z axis) as a response value, First response curved surface A is created. At that time, arbitrary values may be designated for the rotation speed N and the feed speed f. In addition, the illustrated first response curved surface A is schematically formed into a planar shape, and is actually created in a curved surface shape (hereinafter the same in each drawing of FIG. 7).

  The arbitrary point selecting step (Step 2) is a step of selecting arbitrary points P1 to P15 from the first response curved surface A in order to create the second response curved surface B. Specifically, as shown in FIG. 7B, the vertices P1, P5, P11, and P15 of the first response curved surface A and the intersections P2 to P4 obtained by dividing the first response curved surface A into a plurality of grids. , P6 to P10, and P12 to P14 may be selected. Here, 15 points P1 to P15 are selected as arbitrary points, but the present invention is not limited to this, and the number of points to be selected may be increased or decreased according to the shape of the first response curved surface A. The points to be selected may be dense or dense (for example, the number of points to be selected is reduced in the plane portion and the number of points to be selected is increased in the curved surface portion), or a plurality of points are selected at random. Also good.

  The second response curved surface creation step (Step 3) is a step of creating second response curved surfaces B1 to B15 for each burnishing amount Dv and pre-processing surface roughness value of each point P1 to P15. Specifically, as shown in FIG. 7C, regarding the burnishing amount Dv at the point P1 and the surface roughness value before processing, the rotational speed N (X of the roller 1 with respect to the surface roughness value after processing (Z axis) A second response curved surface B1 indicating the relationship between the axis) and the feed speed f (Y axis) is created, and the same processing is repeated for points P2 to P15. Accordingly, in the second response curved surface creation step (Step 3), the second response curved surface B is created by the number of points selected in the arbitrary point selection step (Step 2).

  The third response curved surface creation step (Step 4) is a step of creating a third response curved surface Amax based on the second response curved surfaces B1 to B15. Specifically, as shown in FIG. 7 (d), the burnishing amount Dv having the post-processing surface roughness value as the response value from the maximum value of the post-processing surface roughness values in the second response curved surfaces B1 to B15. Then, an approximate curved surface of the surface roughness value before processing is calculated to create a third response curved surface Amax. That is, the third response curved surface Amax is a curved surface having a maximum response value when the rotation speed N of the roller 1 and the feed speed f, which are parameters for determining the first response curved surface A, are changed.

  The fourth response curved surface creation step (Step 5) is a step of creating a fourth response curved surface Amin based on the second response curved surfaces B1 to B15. Specifically, as shown in FIG. 7D, the burnishing amount Dv whose response value is the processed surface roughness value from the minimum value of the processed surface roughness values on the second response curved surfaces B1 to B15, and An approximate curved surface of the surface roughness value before processing is calculated to create a fourth response curved surface Amin. That is, the fourth response curved surface Amin is a curved surface having a minimum response value when the rotation speed N and the feed speed f of the roller 1 which are parameters for determining the first response curved surface A are changed.

  The first condition selecting step (Step 6) is a step of determining the burnishing amount Dv and the pre-processing surface roughness value satisfying a desired required surface roughness value condition using the third response surface Amax and the fourth response surface Amin. It is. Specifically, as illustrated in FIG. 7E, a space AR1 surrounded by the third response curved surface Amax and the fourth response curved surface Amin is determined, and as illustrated in FIG. 7F, the space AR1 is determined. The space AR2 in which the post-processing surface roughness value is equal to or less than the required surface roughness value is determined. The range in the space AR2 is a set of points where the post-processing surface roughness value is equal to or less than the required surface roughness value, and any desired point satisfies the desired required surface roughness value condition. Therefore, by selecting an arbitrary point from the space AR2, it is possible to select the burnishing amount Dv and the surface roughness value before processing that the surface roughness value after processing is equal to or less than the required surface roughness value. Moreover, you may make it select the gravity center point or center point of space AR2 as arbitrary points.

  The fifth response curved surface creation step (Step 7) is a step of creating a fifth response curved surface C1 for the burnishing amount Dv and the surface roughness value before processing selected in the first condition selection step (Step 6). Specifically, as shown in FIG. 7G, the data stored in the database is used for the burnishing amount Dv and the surface roughness value before processing selected in the first condition selection step (Step 6). Then, a fifth response curved surface C1 of the rotational speed N (X axis) and the feed speed f (Y axis) of the roller 1 is created with the processed surface roughness value (Z axis) as a response value.

  The second condition selection step (Step 8) is a step of determining the rotation speed N and the feed speed f of the roller 1 that satisfies the condition of the desired required surface roughness value for the fifth response curved surface C1. Specifically, as shown in FIG. 7 (h), a response curved surface C2 in which the post-processing surface roughness is equal to or less than the required surface roughness value in the fifth response curved surface C1 is determined. The range in the response curved surface C2 is a set of points where the post-processing surface roughness value is equal to or less than the required surface roughness value, and any desired point satisfies the desired required surface roughness value condition. Therefore, by selecting an arbitrary point from the response curved surface C2, it is possible to select the rotation speed N and the feed speed f at which the post-processing surface roughness value is equal to or less than the required surface roughness value. Moreover, you may make it select the gravity center point or center point of the response curved surface C2 as arbitrary points.

  The sixth response curved surface creation step (Step 9) is a step of creating a sixth response curved surface M for the dimensional change Ds before and after the burnishing. Here, the sixth response curved surface M is the number of rotations of the roller 1 determined in the burnishing amount Dv and the surface roughness value before processing determined in the first condition selection step (Step 6) and the second condition selection step (Step 8). This is a process for determining the dimensional change amount Ds from N and the feed speed f. Now, since the first condition selection step (Step 6) and the second condition selection step (Step 8) all of the burnishing amount Dv, the surface roughness value before processing, the rotation speed N, and the feed speed f are determined, these The same result can be obtained regardless of which two parameters (two conditions) are selected. That is, in order to create the sixth response curved surface M, any two parameters may be selected formally from these four parameters. Specifically, as shown in FIG. 7I, the sixth response curved surface M includes, for example, a burnishing amount Dv (X axis) having a dimensional change Ds (Z axis) as a response value and a surface roughness before processing. It is a response surface with a thickness value (Y axis). Of course, the sixth response curved surface M may be a response curved surface with the rotational speed N and the feed speed f having the dimensional change Ds as a response value.

  The third condition calculating step (Step 10) is a step of determining the dimension change amount Ds and calculating the dimension before processing. Specifically, when the sixth response curved surface M is created based on the burnishing amount Dv and the surface roughness value before processing, the burnishing amount Dv and surface roughness before processing determined in the first condition selection step (Step 6). The value is applied to the sixth response curved surface M to determine the dimensional change amount Ds. When the sixth response curved surface M is created based on the rotational speed N and the feed speed f, the rotational speed N and the feed speed f determined in the second condition selection step (Step 8) are applied to the sixth response curved face M. Thus, the dimensional change amount Ds is determined. If the dimensional change amount Ds is determined in this manner, the dimension before processing can be calculated by adding the required dimension thereto.

  The pre-processing surface roughness value can be determined by the first condition selection step (Step 6) described above, and the pre-processing dimensions can be determined by the third condition calculation step (Step 10). That is, if the metal material 2 is molded so as to satisfy the surface roughness value before processing and the dimensions before processing, the burnishing amount Dv determined in the first condition selection step (Step 6) and the second condition selection step (Step 8). By performing burnishing with the determined rotation speed N of the roller 1 and the feed speed f, the metal material 2 that satisfies the required surface roughness value and the required dimensions can be obtained.

  Therefore, as shown in FIG. 6, before the burnishing step (Step 12), the metal material 2 was selected in the pre-working dimension calculated in the third condition calculation step (Step 10) and the first condition selection step (Step 6). You may have the shaping | molding process process (Ste11) processed into the shape which has the surface roughness value before a process. By this molding process, the metal material 2 having the pre-process dimension calculated in the third condition calculation step (Step 10) and the pre-process surface roughness value selected in the first condition selection step (Step 6) can be easily obtained. . In such a molding process (Step 11), using a control device such as a computer, the pre-process dimensions calculated in the third condition calculation process (Step 10) and the pre-process surface roughness value selected in the first condition selection process (Step 6). May be automatically input to control the machining apparatus.

  In the burnishing process (Step 12), for example, the predetermined metal material 2 obtained in the molding process (Step 11) is burned using the burnishing amount Dv, the rotational speed N, and the feed speed f that have already been determined. It is a process. In the present embodiment, since the metal material 2 before processing has predetermined dimensions before processing and surface roughness values before processing, the conditions of the burnishing amount Dv, the rotation speed N, and the feed speed f are adjusted each time. There is no need, and the number of burnishing conditions can be set or changed, and the burnishing can be performed while maintaining the optimum burnishing conditions, so that stable burnishing can be performed.

  Further, according to the present embodiment, response surfaces (for example, first response surface A to sixth response surfaces) based on predetermined parameters (for example, burnishing amount Dv, surface roughness value before processing, rotation speed N, feed rate f, etc.). Since the response curved surface M) can be created and the burnishing conditions can be determined from the response curved surface, the burnishing conditions can be easily set in a short time without relying on a skilled person. Note that the above-described database creation step (Step 0) to the third condition calculation step (Step 10) can be executed by a computer (not shown). When such a computer is used, burnishing is simpler and in a short time. Processing conditions can be set.

  In the present embodiment described above, the burnishing process for crushing the surface of the metal material 2 with the rotating roller 1 to make the surface roughness value and dimension of the metal material 2 the required surface roughness value and the required dimension is performed. And at least the burnishing amount Dv for the metal material 2, the surface roughness value before processing before burnishing, the rotational speed N of the roller 1, and the feed speed f that is the speed at which the roller 1 moves. A response surface (for example, first response surface A to sixth response) with respect to the surface roughness value after burnishing and the dimensional change Ds before and after burnishing based on the data stored in the database. A curved surface M) is created, and from the response curved surface, using the required surface roughness value and the required dimension, the pre-processing dimension and the pre-processing surface roughness value of the metal material 2 and the rotation speed of the roller 1 In other words, the feed speed f is derived and the burnishing process is performed on the metal material 2 having the derived pre-process dimension and the pre-process surface roughness value at the derived rotation speed N and the feed speed f. it can.

  Next, a burnishing method according to another embodiment of the present invention will be described with reference to FIG. Here, FIG. 8 is a diagram showing a response curved surface used in the burnishing method according to another embodiment of the present invention, (a) is a first condition selection step, (b) is a second condition selection step, Is shown.

  As shown in FIG. 8A, in the first condition selection step (Step 6), the processed surface roughness value is the required surface roughness in the space AR1 surrounded by the third response surface Amax and the fourth response surface Amin. You may make it determine the plane S used as a value. That is, a required surface roughness value that is a specific numerical value may be used as a condition for the post-processing surface roughness value. The range in the plane S is a set of points at which the post-processing surface roughness value becomes the required surface roughness value, and any desired point satisfies the desired required surface roughness value condition. Therefore, by selecting an arbitrary point from the plane S, it is possible to select the burnishing amount Dv at which the post-processing surface roughness value becomes the required surface roughness value and the pre-processing surface roughness value. Moreover, you may make it select the gravity center point or center point of the plane S as arbitrary points.

  As shown in FIG. 8B, in the second condition selection step (Step 8), the curve L (including the case of a straight line) in which the post-processing surface roughness becomes the required surface roughness value in the fifth response curved surface C1. May be determined. That is, a required surface roughness value that is a specific numerical value may be used as a condition for the post-processing surface roughness value. This curve L is a set of points at which the post-processing surface roughness value becomes the required surface roughness value, and any desired point satisfies the desired required surface roughness value condition. Therefore, by selecting an arbitrary point from the curve L, it is possible to select the rotation speed N and the feed speed f at which the post-processing surface roughness value becomes the required surface roughness value. Moreover, you may make it select the gravity center point or center point of the curve L as arbitrary points.

  The present invention is not limited to the above-described embodiment. For example, the shape of the metal material 2 may be a cylindrical shape, a curved surface shape, a planar shape, or the like. Needless to say, various modifications can be made without departing from the spirit of the present invention.

1 Roller 2 Metal Material A First Response Curve Amax Third Response Curve Amin Fourth Response Curve AR1, AR2 Space B, B1 to B15 Second Response Curve C1 Fifth Response Curve Ds Dimensional Change Dv Burnishing Amount f Feeding Speed M First Six-response curved surface N Number of revolutions P1 to P15

Claims (8)

A burnishing method for crushing the surface of the metal material with a rotating roller to make the surface roughness value and dimension of the metal material the required surface roughness value and the required dimension,
A first response curved surface creating step for creating a first response curved surface showing a relationship between a burnishing amount with respect to a post-processing surface roughness value after burnishing and a pre-processing surface roughness value before burnishing;
An arbitrary point selecting step of selecting a plurality of arbitrary points on the first response surface;
Regarding the burnishing amount and surface roughness value before processing selected at the arbitrary point selection step, the relationship between the rotation speed of the roller with respect to the surface roughness value after processing and the feed speed, which is the speed at which the roller moves, is as follows. A second response surface creation step for creating each of the second response surfaces shown,
A third response curved surface creating step for creating a third response curved surface showing the relationship between the burnishing amount and the surface roughness value before processing with respect to the maximum value of the surface roughness value after processing in each second response curved surface;
A fourth response curved surface creating step for creating a fourth response curved surface showing a relationship between a burnishing amount and a surface roughness value before processing for the minimum value of the surface roughness value after processing in each of the second response curved surfaces;
A first condition for selecting a burnishing amount and a pre-processing surface roughness value at which the post-processing surface roughness value is equal to or less than the required surface roughness value for a space surrounded by the third response curved surface and the fourth response curved surface A selection process;
A fifth response curved surface creation step for creating a fifth response curved surface showing the relationship between the rotational speed and the feed speed with respect to the post-processing surface roughness value for the burnishing amount and the pre-processing surface roughness value selected in the first condition selection step. When,
A second condition selection step of selecting a rotation speed and a feed rate at which the post-processing surface roughness value is equal to or less than the required surface roughness value for the fifth response curved surface;
A sixth response curved surface creating step for creating a sixth response curved surface showing a relationship between two conditions of the burnishing amount, the surface roughness value before processing, the rotation speed, and the feed speed with respect to the dimensional change amount before and after burnishing. When,
Substituting the numerical value selected in the first condition selection step or the second condition selection step into the two conditions of the sixth response curved surface to determine the dimensional change amount, and adding the determined dimensional change amount and the required dimension. A third condition calculating step of calculating the value obtained as a pre-processing dimension of the metal material
The number of rotations and feed speed selected in the second condition selection step and the burnishing amount selected in the first condition selection step are selected in the pre-working dimensions calculated in the third condition calculation step and the first condition selection step. A burnishing step for performing burnishing on the metal material having the surface roughness value before processing,
A burnishing method characterized by comprising:   The said arbitrary point selection process is a process of selecting each vertex of said 1st response curved surface, and the intersection which divided | segmented the inside of said 1st response curved surface into plurality in the shape of a grid | lattice. Burnishing method.   In the first condition selection step, a plane in which the post-processing surface roughness value becomes the required surface roughness value or the required surface roughness value for the space surrounded by the third response curved surface and the fourth response curved surface The burnishing method according to claim 1, wherein the burnishing method is a step of selecting a barycentric point or a burnishing amount of the center point and a surface roughness value before processing in the following space.   In the second condition selection step, the rotation speed of the center point or the center point of the curved surface whose surface roughness after processing is the required surface roughness value or the required surface roughness value or less for the fifth response curved surface The burnishing method according to claim 1, wherein the burnishing method is a step of selecting a feed rate.   The burnishing method according to claim 1, wherein the surface roughness value is an arithmetic average roughness value or a maximum height roughness value.   Before the first response curved surface creation step, it has a database creation step of measuring data for creating the first to sixth response curved surfaces and creating a database storing the measured data The burnishing method according to claim 1.   Before the burnishing process, the metal material is processed into a material having the pre-process dimension calculated in the third condition calculation process and the pre-process surface roughness value selected in the first condition selection process. It has a process, The burnishing processing method of Claim 1 characterized by the above-mentioned. A burnishing method for crushing the surface of the metal material with a rotating roller to make the surface roughness value and dimension of the metal material the required surface roughness value and the required dimension,
Creating a database including at least a burnishing amount, a pre-processing surface roughness value before burnishing, a rotation speed of the roller, and a feed speed that is a speed at which the roller moves, with respect to the metal material;
Based on the data stored in the database, create a response surface for the post-processing surface roughness value after burnishing and the dimensional change amount before and after burnishing,
From the response curved surface, using the required surface roughness value and the required dimension, the pre-processing dimension and the pre-processing surface roughness value of the metal material, the rotational speed and feed speed of the roller are derived,
A burnishing method, wherein burnishing is performed on the derived metal material having the pre-process dimension and the pre-process surface roughness value at the derived rotational speed and feed rate.