JP2019000870A - Method for manufacturing component with groove - Google Patents

Abstract

To provide a manufacturing method including correction processing which is effective for solving warping and bending generated on an outer side of a groove part of a component with groove.SOLUTION: A method for manufacturing a component 1 with groove, which has a first face 4 on which openings 13, 14 of plural groove parts 11, 12 are provided and a second face 5 positioned on a side opposite to the first face 4, comprises a correction process. according to the correction process, in the first face 4, a first outside pressing part 21, which is positioned on a face on one end side with respect to the opening of the first groove part 11, is pressed, and a second outside pressing part 22, which is positioned on a face on the other side with respect to the opening 14 of the second groove part 12, is pressed. In the second face 5, a first inside pressing part 23, which is positioned on a second face opposite to the first face 4 between the first outside pressing part 21 and the opening of the first groove part 13, is pressed, and a second inside pressing part 24, which is positioned on a second face opposite to the first face 4 between the second outside pressing part 22 and the opening 14 of the second groove part 12, is pressed, and thus, an end part of the component with groove is corrected.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for manufacturing a grooved member having a plurality of groove portions. The present invention relates to a manufacturing method including a step of correcting a portion located outside the groove.

  A member provided with a plurality of grooves is used in many fields. For example, the rectangular flange part 17 with a groove shown in FIGS. 8A and 8B is a plate-like part having a plurality of groove portions 18. Since it can be combined with other parts via the groove 18, it is used for a stopper, a support, a spacer part, or the like. When the component is fixed, it is fixed with a bonding material or the like (FIG. 8A), or is fixed by inserting a bolt or the like into the hole 19 provided in the base material (FIG. 8B).

  Due to recent demands, the use of grooved parts with deep grooves has increased. In the manufacturing process of such a grooved component, as shown in FIGS. 9A and 9B, a die including a die 51 having a convex stamping portion 59 and a flat punch 52 is used. Thus, a grooving process for forming the groove portion is performed. The die 51 is pressed against the plate member 60 to form the grooved member 1 having a groove.

  However, warping or bending may occur at both ends of the grooved member 1 that has been subjected to grooving. If the process proceeds to a subsequent process while leaving the warp or bend, the product will be adversely affected, and as shown in FIGS. 10A and 10B, correction processing is performed to eliminate the warp and bend. The In the straightening process, the grooved member 1 is pressed and deformed so as to be flat as a whole by using a die composed of a flat plate die 61 and a punch 62.

  Even after this straightening process, some warping or bending remains. Therefore, finally, as shown to (A)-(D) of FIG. 11, it grinds and finishes so that it may become a predetermined shape and dimension. Specifically, it is as follows. After the straightened member is placed on the processing table 56 such that the surface of the groove portion is the upper surface 57, the grindstone 55 is reciprocated to grind the upper surface 57 of the workpiece (FIG. 11A). . Grinding is continued until the upper surface 57 becomes flat (FIG. 11B). Next, the workpiece is reversed and placed so that the lower surface 58 faces upward, and then the lower surface is ground by the grindstone 55 (FIG. 11C). Grinding is continued until the lower surface reaches the target plate thickness (FIG. 11D).

  When the straightening load is released, elastic recovery (spring bag) occurs. For this reason, it is known to perform correction processing after estimating the elastic recovery amount. For example, Patent Document 1 relates to a method of correcting a profile by press working, after the material yields during correction, unloads once, obtains a slope γ of a displacement-load curve at the time of unloading, and then loads again. Then, a correction method is proposed in which pressing is performed while measuring the load P and displacement δ, and the pressing is terminated when the correction amount δ ′ after springback becomes equal to the initial bending amount. Specifically, the deformation at the time of straightening is bending the entire article to be straightened using a method of pressing a central part of a long material such as a rail with a press.

JP-A-6-277760

  In the conventional straightening process, the warp of the product to be straightened could not be sufficiently removed. It was necessary to perform press working or straightening in consideration of the portion that would be warped to be removed by grinding after straightening.

  In addition, the amount of elastic recovery that occurs after correction processing varies depending on the material characteristics and processing conditions of the member, and the degree of warping after correction varies depending on the amount of elastic recovery. Therefore, in the conventional correction method, it is necessary to prepare a mold individually according to the amount of warpage of each product to be corrected. In addition, manufacturing management was complicated during the straightening process.

  In the conventional straightening of the grooved member, bending stress acts on the entire plate material, but the groove portion having a relatively small plate thickness is more easily bent than the other portions. Therefore, as shown in FIG. 12, the plastic deformation due to the bending 41 occurs in the groove 15, and the deformed shape remains. Thereafter, when the deformed shape is finished to the final shape by grinding, in order to make the upper surface 57 and the lower surface 58 of the grooved member flat, more parts are removed by grinding. The thickness is greatly reduced. Therefore, in order to obtain a grooved member having a predetermined dimension, the grooving process is performed in advance using a plate material having a large thickness. Therefore, it has been difficult and difficult to reduce the cost and processing time required for manufacturing.

  The correction method disclosed in Patent Document 1 can be applied to correction processing in which the center portion of a product to be corrected is pressed and bent as a whole. However, it cannot be applied to correction processing for local warping or bending that occurs outside the groove portion of the grooved member.

  An object of this invention is to provide the manufacturing method including the correction process effective in eliminating the curvature and bending which arose on the outer side of the groove part of a grooved member.

  The present inventors have studied in view of the above problems, and found that a flat shape with less warpage can be obtained by using a presser die for suppressing bending deformation of the groove portion, thereby completing the present invention. It came to. Specifically, the present invention provides the following.

(1) The present invention is a method for manufacturing a grooved member having a plurality of groove portions, wherein the grooved member includes a first surface provided with an opening of the groove portion, and an opposite side of the first surface. And the groove portion is disposed close to one end of the grooved member and the other end of the grooved member. A second groove portion, and the first surface presses the first outer pressing portion located on the surface on the one end side with respect to the opening of the first groove portion, and the second surface A second outer pressing portion located on the surface on the other end side than the opening of the groove portion, and the first outer pressing portion and the opening of the first groove portion on the second surface. And pressing the first inner pressing portion located on the second surface opposite to the first surface between the second outer surface and the second outer surface A second inner pressing portion located on the second surface opposite to the first surface between the pressing portion and the opening of the second groove is pressed, and the first inner pressing portion and the one end are pressed. The second surface between the second inner surface and the second inner pressing portion and the other end, the first inner pressing portion and the second inner pressing portion. It is a manufacturing method of a grooved member including the process of pushing forward so that it may pass the surface which tied, and correcting the edge part of a grooved member.

(2) The present invention provides a die capable of pressing the first outer pressing location and the second outer pressing location, and a punch capable of pressing the first inner pressing location and the second inner pressing location. The method for manufacturing a grooved member according to (1), wherein the grooved member is corrected using a mold including

(3) This invention is a manufacturing method of the member with a groove | channel as described in (2) which presses the said 1st surface between the said 1st groove part and the said 2nd groove part by board pressing. .

(4) The present invention provides the grooved member manufacturing method according to (2) or (3), wherein a jig is inserted and pressed into the opening of the first groove and the opening of the second groove. It is.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to correct | amend effectively the curvature and bending which arose on the outer side of the groove part of a grooved member. For this reason, since the portion removed by the subsequent grinding process is reduced, it contributes to the reduction of the working time and material cost of the grinding process.

It is a schematic diagram for demonstrating the manufacturing method which concerns on this invention, (A) shows the state at the time of correction processing, (B) shows the state after correction processing. It is a schematic diagram for demonstrating the manufacturing method of a reference example, (A) shows the state at the time of correction processing, (B) shows the state after correction processing. It is a figure which shows Example 1 of Embodiment which concerns on this invention. It is a figure which shows Embodiment Example 2 which concerns on this invention. It is a figure which shows the manufacturing method which concerns on a comparative example. It is a figure which shows the target shape of the test body used in the Example, (A) and (B) show the case where a test body has a flat bottom-shaped groove part, (C) shows that a test body is a round bottom. The case where it has a groove part is shown. It is a figure for demonstrating the determination criterion of the curvature used in the Example, (A) shows the case where curvature generate | occur | produced in the upper surface direction, (B) shows the case where curvature generate | occur | produced in the lower surface direction. It is a figure which shows the example of a member with a groove | channel, (A) and (B) show the example. It is a figure for demonstrating the conventional grooving process regarding a grooved member, (A) shows the state before a process, (B) shows the state after a process. It is a figure for demonstrating the conventional correction process regarding a grooved member, (A) shows the state before a process, (B) shows the state after a process. It is a figure for demonstrating the conventional grinding process regarding a grooved member, (A) shows the state before grinding an upper surface, (B) shows the state after grinding an upper surface, (C) Indicates a state before the lower surface is ground, and (D) indicates a state after the lower surface is ground. It is a figure for demonstrating the problem by the conventional correction process.

  An embodiment of the present invention will be described. The following description does not limit the invention.

(Grooved member)
The present invention relates to a method for manufacturing a grooved member having a plurality of groove portions. The grooved member targeted by the manufacturing method of the present invention is shown in FIGS. The grooved member 1 has a first surface 4 in which the opening 13 of the groove portion 11 is provided, and a second surface 5 located on the opposite side of the first surface 4. The groove portion 11 includes a first groove portion 4 disposed close to the one end 2 of the grooved member 1 and a second groove portion 12 disposed close to the other end 3 of the grooved member 1.

  The number and position of the grooves are matters that are appropriately set according to the application. When two groove portions are provided, the groove portions can be set to be symmetrical positions.

  The manufacturing method which concerns on this invention includes the process of the correction process which corrects the edge part of a grooved member. This embodiment regarding the straightening process is shown in FIG. 1 and FIG. 3, (A) and FIG. 3 in FIG. 1 show the state during straightening process, and (B) in FIG. Indicates the state. In the straightening process, both the first surface 4 and the second surface 5 of the grooved member 1 are pressed by the die 32 and the punch 33 of the mold 31.

(Outside pressing point)
In the 1st surface 4, while pressing the 1st outer side press location 21 located on the surface by the side of the one end 2 of a grooved member rather than the opening 13 of the 1st groove part 11, of the 2nd groove part 12 The second outer pressing portion 22 located on the surface on the other end 3 side of the grooved member 1 is pressed from the opening 14.

  In the case of pressing at the outer pressing portion, a means capable of pressing at least two locations satisfying the above-described position condition may be applied to the first surface. There may be three or more pressing locations. The contact between the mold and the first surface may be in a wide range or local contact. For example, when the mold surface is inclined in the same direction with respect to the first surface, contact is made in a wide range, and when the mold surface is inclined in the opposite direction, contact is made in a narrow range. The outer side press location of this embodiment corresponds to the location located in the outermost area in the contact surface of a metal mold | die and a 1st surface.

(Inside pressing part)
On the second surface 5 of the grooved member 1, on the second surface 5 opposite to the first surface 4 between the first outer pressing portion 21 and the opening 13 of the first groove portion 11. While pressing the 1st inner side press location 23 located, the 1st surface 4 between the 2nd outer side press location 22 and the opening 14 of the said 2nd groove part 12 of the 2nd surface 5 on the opposite side The second inner pressing portion 24 located above is pressed.

  In the case of pressing at the inner pressing location, a means capable of pressing at least two locations satisfying the above positional condition may be applied to the second surface. There may be three or more pressing locations. The contact between the mold and the second surface may be in a wide range or local contact. For example, when the mold surface is inclined in the same direction with respect to the second surface, contact is made in a wide range, and when the mold surface is inclined in the opposite direction, contact is made in a narrow range. The inside pressing location of the present embodiment corresponds to a location located in the outermost region on the contact surface between the mold and the first surface.

  As described above, in the present embodiment, both the first surface 4 and the second surface 5 of the grooved member are pressed at at least two positions located outside the openings 13 and 14 of the groove portions 11 and 12. And the outer pressing locations 21 and 22 on the first surface 4 having the openings 13 and 14 of the grooves 11 and 12 are positioned closer to the end side than the inner pressing locations 23 and 24 on the second surface 5. There is a feature. With this feature, the load applied in the straightening process can be concentrated on the end side of the groove and can be corrected locally.

  2A and 2B show a reference example in which the inner pressing place is positioned closer to the center than the opening of the groove unlike the present embodiment. 2A shows a state at the time of straightening, and FIG. 2B shows a state after the straightening. In the second surface 5 of the grooved member 1, the inner pressing portion 25 is located not on the outer side of the opening 13 of the groove portion 11 but on the center portion side. Therefore, as shown in FIG. 2B, the applied load acts to deform the groove. Since the thickness of the groove portion is smaller than that of other portions, plastic deformation is induced by the introduced processing strain, and there is a possibility that a deformed portion such as a bent portion 41 is formed. When such bending occurs, it becomes difficult to remove by subsequent grinding.

  On the other hand, since the correction processing according to the present invention locally eliminates the warp by locally deforming the end portion of the grooved member, there is little possibility that a problem such as bending in the groove portion occurs. Therefore, the remaining amount of warpage is reduced, the portion to be removed by the grinding process in the subsequent process is reduced, and this is effective in reducing the processing time and processing cost.

  Further, in the present embodiment, the surface 5 between the first inner pressing portion 23 and the one end 2 of the grooved member 1 and the second inner pressing portion 24 and the other end 3 of the grooved member 1 are arranged. A certain second surface 5 is pushed over the surface connecting the first inner pressing portion 23 and the second inner pressing portion 24. Even when pressed in the direction opposite to the warp of the grooved member, elastic recovery (sling back) occurs by releasing the load. Therefore, in this embodiment, the elastic recovery is suppressed by further pushing the pressing in the direction opposite to the warp more than the surface of the central portion of the grooved member.

  The present invention preferably includes correction processing according to the following first and second embodiments.

(Example 1)
FIG. 3 shows a first embodiment of the present invention. The grooved member 1 includes a first groove 11 on the one end 2 side and a second groove portion 12 on the other end 2 side. The dies 31 are arranged on both surfaces of the grooved member 1, the first surface 4 is pressed by the die 32, and the second surface 5 is pressed by the punch 33.

  The outer pressing portion 21 where the die presses the first surface 4 is located on the surface closer to the one end 2 than the opening 13 of the first groove portion 11, and presses the vicinity of the one end 2 in FIG. 3. . The outer pressing portion 22 is located on the surface on the other end 3 side of the opening 14 of the second groove portion 12 and presses the vicinity of the other end 3 in FIG.

  The first inner pressing portion 23 where the punch 33 presses the second surface 5 is the first inner side opposite to the first surface 4 between the first outer pressing portion 21 and the opening 13 of the first groove 11. 2 is located above the surface 5 of FIG. 2, and in FIG. The second inner pressing portion 24 is located on the second surface 5 opposite to the first surface 4 between the second outer pressing portion 22 and the opening 14 of the second groove 12. In FIG. 3, the vicinity of the outer side than the edge 16 of the opening is pressed.

  Furthermore, the punch 33 has an inclined surface so that the end side surface is positioned below the center of the grooved member. The die 32 has an inclined end surface so as to correspond to the shape of the punch 33. As a result, the end portion of the grooved member is moved in the direction opposite to the warp (corresponding to the direction of the second surface in FIG. 3), and the first inner pressing portion 23 and the second inner pressing portion 24 are moved. Since it can be pushed beyond the tied surface, it is effective in suppressing elastic recovery.

  The example described with reference to FIG. 3 is a case where the end portion of the grooved member is corrected in the direction of the first surface 4 as shown in FIG. As shown in FIG. 7B, when correcting the shape in which the end of the grooved member is warped in the direction of the second surface 5, the end of the grooved member is directed toward the first surface 4. What is necessary is just to push and advance so that the surface which tied the 1st outer side press location 21 and the 2nd inner side press location 22 may be pushed.

  In the first embodiment, as described above, both the first surface 4 and the second surface 5 of the grooved member are pressed at at least two positions located outside the opening 13 of the groove portions 11 and 12, In addition, the outer pressing portions 21 and 22 on the first surface 4 having the openings 13 of the groove portions 11 and 12 are characterized in that they are positioned closer to the end portions than the inner pressing portions 23 and 24 on the second surface 5. is there. With this feature, the load applied in the straightening process can be concentrated on the end side of the groove and can be corrected locally.

Embodiment 2
FIG. 4 shows a second embodiment of the present invention. The second embodiment includes the die 32 and the punch 33 of the mold 31 used in the first embodiment. The pressing by the die 32 and the punch 33 and the action due thereto are the same as in the first embodiment. Furthermore, the second embodiment includes a plate presser 34. By installing the plate presser 34, the central portion and the groove portion of the grooved member 1 are fixed, which is effective in suppressing deformation such as bending of the groove portion.

  In the first and second embodiments, as shown in FIG. 3, the end portion of the grooved member is warped upward (first surface side) from the center portion. The correction processing according to the first and second embodiments can be similarly applied when the end portion of the grooved member is warped downward (second surface side) from the central portion. In that case, what is necessary is just to push forward the edge part of the member with a groove | channel for suppressing elastic recovery toward the 1st surface side.

  The present invention can be applied to any member with a groove having a plurality of grooves in a plate material. An example of the grooved member is a grooved rectangular flange part.

  Examples of the present invention will be described. The following description does not limit the scope of the invention.

  Using two types of stainless steel plates shown in Table 1, a test body having a length of 60 mm, a width of 22 mm, and a plate thickness of 5.5 mm was produced and subjected to the following evaluation test. The steel material 1 shown in Table 1 is a material commonly called 17Cr-4Ni-4Cu (SUS630), and the steel material 2 is a material commonly called 15Cr-7Ni-1.5Si-0.4Ti. Table 1 shows the component composition and mechanical properties of the steel. The component composition is expressed in mass%, and the balance is Fe and inevitable impurities. The mechanical properties indicate yield stress: YS (Mpa), tensile strength: TS (MPa), elongation: tEL (%).

  Grooving processing, straightening processing, and surface grinding processing were performed on the test body made of the steel materials 1 and 2 in the same order as the steps shown in FIGS. 9 to 11 to prepare a grooved test body. The manufactured grooved member has a flat bottom groove portion shown in FIGS. 6A and 6B and a round bottom groove portion shown in FIG. 6C. Each of the target grooved members has a plate thickness of 5.0 mm, and the distance between the centers of the two groove portions is 24 mm. Further, the shape and dimensions of the target groove are as shown in Table 2.

(Grooving)
For the grooving process, a punch provided with two stamped portions having the same shape as the target groove shape was used. The distance between the centers of the stamp portions is 24 mm. The punch was pushed into the test materials 1 and 2 made of the steel materials 1 and 2, and two groove portions were formed in the test materials 1 and 2. The indentation load was 500 kN. All of the grooved specimens obtained by grooving were warped.

(Correction processing)
Warping correction processing was performed on the grooved specimen obtained by the above grooved processing. For the correction processing, a mold 31a corresponding to the first embodiment shown in FIG. 3 and a mold 31b provided with a plate presser corresponding to the second embodiment shown in FIG. 4 were used. In the dies of the molds 31a and 31b, the distance between the inner pressing portions 23 and 24 of the grooved member 1 was set to 30 mm. Here, according to the groove dimensions of FIGS. 6A to 6C, the distance between the edges 14 of the openings in the two groove portions is 26.5 mm (= 24 mm + 2.5 mm). , 24 are located outside the opening 11 of the groove. Further, in order to compare with Examples 1 and 2 of the present invention, correction processing was performed using a mold 31c (comparative example) by three-point bending shown in FIG.

(Measurement of warpage ratio)
As shown in FIG. 7, the amount of warpage is the distance between the upper surface and the lower surface of the specimen. The amount of warpage was measured, and the value was divided by the target plate thickness (5.0 mm) to calculate the percentage of warpage. The warpage ratio of the product to be corrected changes depending on the press load. Therefore, a preliminary test was performed to determine the press load (kN) with the smallest warpage ratio. This test was performed using this press load.

(Surface grinding)
In the same manner as the steps shown in FIGS. 11A to 11D, the target shape is obtained by grinding both the upper surface and the lower surface of the test body by the surface grinding, for the straightened grooved test body. Obtained. Specifically, it grind | polished until the upper surface of the grooved test body became flat using the grinding wheel of (phi) 200. Thereafter, the lower surface was ground until the target plate thickness was obtained. The grinding conditions were such that the cutting depth per cut was 8 μm and the feed rate was 0.15 m / s.

  In this specification, the total number of reciprocations that the grindstone has moved until the target thickness is obtained is referred to as the “number of cuts”. It can be evaluated that the smaller the number of cuts, the shorter the processing time in the grinding process and the better the mass productivity. The measurement results are shown in Table 3 (Invention Example 1), Table 4 (Invention Example 2), and Table 5 (Comparative Example).

  As shown in Tables 3 and 4, when the straightening process is performed using the molds 31a and 31b corresponding to Examples 1 and 2 of the present invention, the warpage rate is 20% or less, so the number of cuts in the grinding process Was in a small range of 125 times or less. On the other hand, as shown in Table 5, the straightening process using the mold 31c of the comparative example has a higher warpage ratio than the inventive examples 1 and 2, and requires a large number of cuttings for the grinding process.

  According to said measurement result, it has confirmed that the manufacturing method including the correction process of this invention contributed to mass production of a member with a groove | channel by shortening processing time.

  Further, since the straightening process using the mold 31b (Table 4) has a smaller warpage ratio and the number of cuttings of the grinding process than the straightening process using the mold 31a (Table 3), it can be used together with a plate presser. It can be said that it is more preferable.

DESCRIPTION OF SYMBOLS 1 Grooved member 2 One end 3 Other end 4 1st surface 5 2nd surface 11 1st groove part 12 2nd groove part 13 Opening (1st groove part)
14 Opening (second groove)
15 Edge of opening (first groove)
16 Edge of opening (second groove)
17 Grooved rectangular flange part 18 Groove part 19 Hole 21 First outer pressing part 22 Second outer pressing part 23 First inner pressing part 24 Second inner pressing part 25 Inner pressing part 31 Mold 32 Die 33 Punch 34 Plate holder 35 Pressing jig 41 Bending 42 Bending amount 51 Die (for grooving)
52 Punch (for grooving)
53 Die (for straightening)
54 Punch (for straightening)
55 Grinding wheel 56 Processing table 57 Upper surface 58 Lower surface 59 Stamping portion 60 Plate material

Claims (4)

A method for producing a grooved member having a plurality of grooves,
The grooved member has a first surface provided with an opening of the groove portion, and a second surface located on the opposite side of the first surface,
The groove portion includes a first groove portion disposed close to one end of the grooved member and a second groove portion disposed close to the other end of the grooved member,
In the first surface, the first outer pressing portion positioned on the surface on the one end side with respect to the opening of the first groove portion is pressed, and the other end of the second groove portion is more than the opening of the second groove portion. Pressing the second outer pressing location located on the side surface,
In the second surface, a first inner pressing portion located on the second surface opposite to the first surface between the first outer pressing portion and the opening of the first groove portion is provided. And pressing the second inner pressing location located on the second surface opposite to the first surface between the second outer pressing location and the opening of the second groove,
The second inner surface between the first inner pressing portion and the one end and the second surface between the second inner pressing portion and the other end are referred to as the first inner pressing. Push the part over the surface connecting the part and the second inner pressing part,
The manufacturing method of a grooved member including the process of correcting the edge part of a grooved member. A die capable of pressing the first outer pressing portion and the second outer pressing portion;
A punch capable of pressing the first inner pressing portion and the second inner pressing portion;
The method for manufacturing a grooved member according to claim 1, wherein the grooved member is corrected using a mold including   The manufacturing method of the member with a groove | channel of Claim 2 which presses the said 1st surface between a said 1st groove part and a said 2nd groove part by board pressing.   The manufacturing method of the member with a groove | channel of Claim 2 or 3 which inserts and presses a jig | tool into the opening of the said 1st groove part, and the opening of the said 2nd groove part.

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