Loading device

Abstract

To provide a loading device capable of evaluating the relationship between the load applied in a burnishing process and the amount of plastic deformation.SOLUTION: A loading device 100 comprises: a pedestal part 110 having an installation side 111 on which a metal member 200 is installed; a metal ball 120 located on the metal member and having higher hardness than the metal member; a movement member 130 movable in a movement direction (X axis direction) along the installation side on the metal ball; a movement mechanism 140 for moving the movement member in the movement direction; and a loading mechanism 150 for applying a first load in a direction crossing the movement direction to the movement member. The loading mechanism includes a rolling jig 151 located on the movement member so as to be capable of rolling, a loading unit 154 for applying the first load to the rolling jig, and a first load sensor 155 for detecting the first load. The first load sensor detects the first load when the metal ball and the rolling jig are rolled, owing to the fact that the movement member is moved in the movement direction while the first load is being applied to the movement member.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a load-applying device. [Background technology]

[0002] Conventionally, there has been known a steering device that allows a driver to move an operating member forward and backward on a slide rail (see, for example, Patent Document 1). In such a steering device, a ball slide structure is applied to the slide rail. Meanwhile, there is also known a ball slide structure in which the rail is made of sheet metal to reduce cost and weight, and a ball transfer groove is formed in the rail by burnishing (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-172139 A [Patent Document 2] Japanese Patent Application Publication No. 06-58331 Summary of the Invention [Problem to be solved by the invention]

[0004] When forming ball transfer grooves by burnishing, it is necessary to understand the relationship between the load applied in burnishing and the amount of plastic deformation, and to apply an appropriate load to the object during formation. In other words, it is difficult to evaluate the load applied in burnishing with high precision. For this reason, there is a demand for a load application device that can stably apply the load applied in burnishing to the object.

[0005] Therefore, an object of the present invention is to provide a load application device that can stably apply the load applied during burnishing to an object, in order to evaluate with high precision the relationship between the load applied during burnishing and the amount of plastic deformation. [Means for solving the problem]

[0006] In order to solve the above problem, a load applying device according to one aspect of the present invention is a load applying device that plastically deforms a metal member, and includes a base portion having an installation surface on which the metal member is installed, a metal ball that is arranged on the metal member and has a hardness greater than that of the metal member, a moving member that is arranged on the metal ball and is movable in a moving direction along the installation surface, a moving mechanism that moves the moving member in the moving direction, and a load applying mechanism that applies a first load to the moving member in a direction intersecting the moving direction, wherein the load applying mechanism includes a rolling tool that is arranged to be rollable on the moving member, a load applying unit that applies the first load to the moving member by applying the first load to the rolling tool, and a first load sensor that detects the first load, and the first load sensor detects the first load when the metal ball and the rolling tool are rolled by the moving mechanism moving the moving member in the moving direction with the load applying unit applying the first load to the moving member via the rolling tool. Effect of the Invention

[0007] According to the present invention, it is possible to provide a load applying device capable of stably applying a load during burnishing, thereby making it possible to evaluate with high accuracy the relationship between the load applied during burnishing and the amount of plastic deformation. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view showing a schematic diagram of a load applying device according to an embodiment. [Diagram 2] 5 is an explanatory diagram showing the positional relationship between the rolling jig and each metal ball according to the embodiment. FIG. [Diagram 3] 13 is an explanatory diagram showing the positional relationship between a rolling jig according to a modified example and each metal ball. FIG. [Figure 4] 11A and 11B are schematic diagrams showing a state in which a moving member according to the embodiment is moving; [Diagram 5] 13A and 13B are schematic diagrams showing a state in which a moving member according to a comparative example is moving. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples and are not intended to limit the present invention. In addition, among the components in the following embodiments, components that are not described in the independent claims showing the realization of one embodiment of the present disclosure are described as optional components. The realization of the present disclosure is not limited to the current independent claims, and may also be expressed by other independent claims.

[0010] In addition, the drawings are schematic diagrams in which emphasis, omissions, and ratios have been appropriately adjusted in order to illustrate the present invention, and may differ from the actual shapes, positional relationships, and ratios.

[0011] (Embodiment 1)

[0012] [Load application device] Fig. 1 is a plan view that shows a schematic diagram of a load applying device 100 according to an embodiment. As shown in Fig. 1, the load applying device 100 is a device that applies a load to a metal member 200, thereby plastically deforming the metal member 200 and detecting the load on the metal member 200. Here, the metal member 200 is a candidate material for a product, and is a rectangular metal flat plate in a plan view.

[0013] The load applying device 100 includes a base portion 110 , a metal ball 120 , a moving member 130 , a moving mechanism 140 , and a load applying mechanism 150 .

[0014] The base 110 is, for example, a surface plate, and the metal member 200 is placed on the upper surface thereof. In other words, the upper surface of the base 110 is a mounting surface 111 on which the metal member 200 is placed. The mounting surface 111 is formed parallel to the XY plane (horizontal plane). The metal member 200 is placed on the mounting surface 111 so that the main surfaces thereof overlap.

[0015] There are a plurality of metal balls 120, each of which is disposed on the metal member 200. Each metal ball 120 is formed of the same metal and has the same size. The hardness of each metal ball 120 is higher than the hardness of the metal member 200.

[0016] The moving member 130 is disposed on the plurality of metal balls 120, and is a member that is freely movable in a moving direction (the X-axis direction in this embodiment) along the installation surface 111. The moving member 130 is a metal flat plate that is rectangular in a plan view. The moving member 130 is disposed so that a main surface thereof is along the installation surface 111.

[0017] The moving mechanism 140 is a part for moving the moving member 130 in the moving direction. The moving mechanism 140 is disposed in the positive direction of the X-axis of the moving member 130. The moving mechanism 140 has a shaft portion 141 extending in the X-axis direction, and the tip portion of the shaft portion 141 is in contact with the end portion of the moving member 130 in the positive direction of the X-axis. A driving source is connected to the shaft portion 141, and the shaft portion 141 slides in the negative direction of the X-axis by the power of the driving source, thereby applying a second load in the moving direction to the moving member 130. The moving member 130 is pushed forward in the negative direction of the X-axis by this second load. The driving source is, for example, a motor, a hydraulic pump, etc. The moving mechanism 140 is provided with a second load sensor 142 that detects the second load when the shaft portion 141 applies the second load to the moving member 130. The second load sensor 142 is, for example, a load cell.

[0018] The load applying mechanism 150 is a part that applies a first load in a direction (negative Z-axis direction) intersecting the movement direction (X-axis direction) to the moving member 130. The load applying mechanism 150 includes a rolling jig 151, a support 152, a beam portion 153, a load applying portion 154, and a first load sensor 155.

[0019] The rolling jig 151 is a jig that is arranged to be freely rollable on the moving member 130. Specifically, the rolling jig 151 is formed in a cylindrical shape extending in the Y-axis direction. The rolling jig 151 rolls in the X-axis direction relative to the moving member 130, following the movement of the moving member 130 in the moving direction (X-axis direction).

[0020] The support pillar 152 is a pillar erected on the installation surface 111. The shaft portion 141 of the movement mechanism 140 penetrates the middle portion of the support pillar 152 so as to be able to slide freely.

[0021] Beam portion 153 is a beam extending in the X-axis direction. An end portion (base end portion) of beam portion 153 in the positive direction of the X-axis is rotatably supported on the upper portion of support column 152. A pressing plate 156 for stably pressing rolling jig 151 is provided at a position corresponding to rolling jig 151 in the middle portion of beam portion 153.

[0022] The load applying part 154 is a part that applies a first load in a direction (Z-axis negative direction) intersecting the moving direction to the rolling jig 151 via the beam part 153. The load applying part 154 is connected to an end (tip) of the beam part 153 in the X-axis negative direction. A driving source such as a motor or a hydraulic pump is also connected to the load applying part 154. The load applying part 154 applies a load in the Z-axis negative direction to the tip part of the beam part 153 by the power of the driving source. As a result, the beam part 153 rotates counterclockwise around the base end part, and the first load is applied to the rolling jig 151. The first load acts on the moving member 130, each metal ball 120, and the metal member 200 via the rolling jig 151. In other words, the first load is a load for burnishing the metal member 200.

[0023] The first load sensor 155 is provided in the load applying unit 154 and detects the first load. The first load sensor 155 is, for example, a load cell.

[0024] [Load detection] Next, the load detection by the load applying device 100 will be described. First, the positional relationship between the rolling jig 151 and each metal ball 120 during load detection will be described. FIG. 2 is an explanatory diagram showing the positional relationship between the rolling jig 151 according to the embodiment and each metal ball 120. FIG. 2(a) is a top view, and FIG. 2(b) is a side view. In the example shown in FIG. 2, four metal balls 120 are provided. The four metal balls 120 are arranged so that each metal ball 120 forms a corner of a rectangle L1 when viewed from above. In this case, the long side of the rectangle L1 is parallel to the X-axis direction, and the short side is parallel to the Y-axis direction. The rolling jig 151 is arranged so that its center line overlaps with the centroid P1 of the rectangle formed by the four metal balls 120. As a result, the first load is evenly distributed and applied to each metal ball 120.

[0025] The number of metal balls to be installed may be any number. FIG. 3 is an explanatory diagram showing the positional relationship between the rolling jig 151 according to the modified example and each metal ball 120. FIG. 3(a) is a top view, and FIG. 3(b) is a side view. In the example shown in FIG. 3, three metal balls 120 are provided. The three metal balls 120 are arranged so that each metal ball 120 forms a corner of an isosceles triangle L2 when viewed from above. In this case, the base of the isosceles triangle L2 is parallel to the Y-axis direction. The rolling jig 151 is arranged so that its center line overlaps with the centroid P2 of the isosceles triangle L2 formed by the three metal balls 120. This allows the first load to be evenly distributed and applied to each metal ball 120.

[0026] In other words, when three or more metal balls are provided, the rolling jig should be placed on the centroid of a polygon whose corners are formed by the metal balls. When two metal balls are provided, the rolling jig should be placed at the midpoint between the two metal balls. Note that there may be only one metal ball, but in this case, it is sufficient that the one metal ball and the rolling jig are placed side by side on the same straight line when viewed in the Y-axis direction.

[0027] In the state shown in FIG. 2, the load applying device 100 performs load detection. First, the load applying unit 154 applies a first load in a direction intersecting the moving direction (Z-axis minus direction) to the rolling jig 151 via the beam unit 153. The first load is also applied to the moving member 130 and each metal ball 120 via the rolling jig 151. In this state, the moving mechanism 140 moves the moving member 130 in the moving direction. FIG. 4 is a schematic diagram showing a state in which the moving member 130 according to the embodiment is moving. As shown in FIG. 4, the rolling jig 151 and each metal ball 120 roll during the movement of the moving member 130. At this time, since the rolling jig 151, the moving member 130, and each metal ball 120 are pressed by the first load, the relative positional relationship between the rolling jig 151 and each metal ball 120 is generally maintained. As a result, the load applied to each metal ball 120 is stabilized. Therefore, the upper surface of the metal member 200 is stably plastically deformed by each of the metal balls 120, which are harder than the metal member 200, and grooves are formed.

[0028] 5 is a schematic diagram showing a state in which the moving member 130 according to the comparative example is moving. FIG. 5 shows a case in which the first load is not applied to the rolling jig 151, the moving member 130, and each metal ball 120. In the comparative example, since there is no first load, the rolling jig 151 also moves following the movement of the moving member 130, and it can be seen that the relative positional relationship between the rolling jig 151 and each metal ball 120 fluctuates. In this case, the metal member 200 is plastically deformed by the load of the rolling jig 151, the moving member 130, and each metal ball 120, but this load is not evenly distributed to each metal ball 120 and fluctuates, so the plastic deformation of the metal member 200 becomes unstable.

[0029] In addition, when the moving member 130 moves, the first load is also applied to the moving member 130, so that the moving member 130 may undergo plastic deformation. If the amount of plastic deformation of the moving member 130 is excessive, the relative positional relationship between the rolling jig 151 and each metal ball 120 changes. For this reason, it is preferable that the hardness of the moving member 130 is higher than the hardness of the metal member 200.

[0030] When the movable member 130 moves, that is, when the metal member 200 is plastically deformed, the first load sensor 155 detects the first load when rolling each metal ball 120 and the rolling jig 151, and the second load sensor 142 detects the second load.

[0031] In this way, the load applying device 100 can detect the first load and the second load and perform the plastic deformation all at once. The amount of plastic deformation of the metal member 200 plastically deformed by the load applying device 100 is measured separately by a contact-type measuring device. The evaluator determines and evaluates the relationship between the measured amount of plastic deformation and the first load detected by the load applying device 100, thereby selecting a load suitable for the specifications of the product when the product is actually produced by burnishing.

[0032] [Effects, etc.] As described above, the load applying device 100 according to the present embodiment is a load applying device that plastically deforms the metal member 200. The load applying device 100 includes a base portion 110 having an installation surface 111 on which the metal member 200 is installed, a metal ball 120 that is arranged on the metal member 200 and has a higher hardness than the metal member 200, a moving member 130 that is arranged on the metal ball 120 and is movable in a moving direction (X-axis direction) along the installation surface 111, a moving mechanism 140 that moves the moving member 130 in the moving direction, and a load applying mechanism 150 that applies a first load to the moving member 130 in a direction intersecting the moving direction. The load applying mechanism 150 includes a rolling jig 151 that is arranged on the moving member 130 so as to be rollable, a load applying unit 154 that applies the first load to the moving member 130 by applying the first load to the rolling jig 151, and a first load sensor 155 that detects the first load. The first load sensor 155 detects the first load when the metal ball 120 and the rolling jig 151 are rolled by the moving mechanism 140 moving the moving member 130 in the movement direction while the load application unit 154 applies a first load to the moving member 130 via the rolling jig 151.

[0033] According to this, the rolling jig 151 and each metal ball 120 roll while the moving member 130 is moving. At this time, the rolling jig 151, the moving member 130, and each metal ball 120 are pressed by the first load, so the relative positional relationship between the rolling jig 151 and each metal ball 120 is generally maintained. As a result, the load applied to each metal ball 120 is also generally constant, so that the upper surface of the metal member 200 is stably plastically deformed by each metal ball 120 to form a groove. The first load sensor 155 detects the first load when the metal member 200 is plastically deformed. Since the first load during stable plastic deformation can be detected, the accuracy of the evaluation is improved. Therefore, with such a load applying device 100, the load applied to the metal member 200 in the burnishing process can be stably applied to the metal member 200. As a result, it is possible to evaluate the relationship between the load applied in the burnishing process and the amount of plastic deformation with high accuracy.

[0034] The moving mechanism 140 also includes a second load sensor 142 that detects the second load when the moving mechanism 140 applies the second load in the moving direction to the moving member 130 .

[0035] According to this, since the second load sensor 142 detects the second load when the second load is applied to the moving member 130, it is possible to detect a fluctuation in the second load. If the fluctuation amount of the second load is excessive, it is possible to determine that the positional relationship between each metal ball 120 and the rolling jig 151 is out of balance.

[0036] Moreover, there are a plurality of metal balls 120, and the rolling jig 151 is cylindrical.

[0037] According to this, since a plurality of metal balls 120 are provided, it is possible to stably support the moving member 130. Furthermore, since the rolling jig 151 is cylindrical, it is possible to increase the contact area with the moving member 130 compared to, for example, when the rolling jig is a sphere, and it is possible to increase the tolerance for positioning with the moving member 130.

[0038] (others) Although the load applying device 100 according to the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment.

[0039] For example, in the above embodiment, the rolling jig 151 is cylindrical, but the rolling jig may have any shape as long as it rolls. Other shapes of the rolling jig 151 include, for example, a sphere, an elliptical cylinder, a Reuleaux triangular prism, and the like.

[0040] In the above embodiment, the load applying device 100 having the second load sensor 142 has been exemplified, but the load applying device does not necessarily have to have the second load sensor.

[0041] In addition, the present invention also includes forms obtained by applying various modifications to the embodiments that a person skilled in the art may conceive, and forms realized by arbitrarily combining the components and functions of the embodiments and modifications within the scope that does not deviate from the spirit of the present invention. [Industrial Applicability]

[0042] The present invention is applicable to a load application device for evaluating the relationship between the load applied in burnishing and the amount of plastic deformation. [Explanation of symbols]

[0043] 100...load applying device 110...base portion 111...installation surface 120...metal ball 130...moving member 140...moving mechanism 141...shaft portion 142...second load sensor 150...load applying mechanism 151...rolling jig 152...support 153...beam portion 154...load applying portion 155...first load sensor 156...pressure plate 200...metal member L1...rectangle L2...isosceles triangle P1...centroid P2...centroid

Claims

1. A load applying device for plastically deforming a metal member, comprising: A base portion having a mounting surface on which the metal member is mounted; A metal ball disposed on the metal member and having a hardness higher than that of the metal member; A moving member that is disposed on the metal ball and is movable in a moving direction along the installation surface; a moving mechanism that moves the moving member in the moving direction; a load applying mechanism that applies a first load to the moving member in a direction intersecting the moving direction, The load applying mechanism includes: A rolling jig that is rollably disposed on the moving member; a load applying unit that applies the first load to the rolling jig to apply the first load to the moving member; a first load sensor for detecting the first load, the first load sensor detects the first load when the metal ball and the rolling jig are rolled by the movement mechanism moving the moving member in the movement direction in a state in which the load application unit applies the first load to the moving member via the rolling jig; Load application device.

2. the moving mechanism includes a second load sensor that detects a second load when the moving mechanism applies a second load in the moving direction to the moving member, The load-applying device according to claim 1 .

3. The metal balls are multiple, The rolling jig is cylindrical. The load-applying device according to claim 1 or 2.

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