JP2009244151A - Sensor and method for detecting pressure and friction force - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure and friction force sensor capable of facilitating work required for constituting the sensor and solving the problem that a work lead time has been elongated and work cost has been raised in the case that complicated work is required when detecting pressure and a friction force acting on the surface of a tool such as a metal mold. <P>SOLUTION: The pressure and friction force sensor 1 detects at least either pressure or a friction force as an object to be detected acting on the surface (a metal mold surface 10) of a prescribed member. The pressure and friction force sensor is provided with a base 2, a plate-like part for receiving the action of the object to be detected via a receiving surface 6 formed on the side of one plate surface; a beam 3 having at least a pair of beams 7 provided approximately symmetrically to a center position of the base 2; a sheet 4 for connecting tips of the pair of beams 7 to each other; and one or a plurality of strain gauges 5 provided in such a way that at least their parts may be positioned at the sheet 4. The receiving surface 6 is formed for the prescribed member in such a way as to form part of the metal mold surface 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is suitable for detecting pressure / friction force acting on the surface of a tool such as a mold during plastic processing such as forging, extrusion and rolling, and molding processing such as injection molding and press molding. The present invention relates to a friction force sensor and a pressure / friction force detection method.

Conventionally, when casting a relatively high pressure such as aluminum die casting, for example, the pressure (melt pressure) generated in the mold is measured by a configuration equipped with a strain gauge for the purpose of managing casting conditions and the like. (For example, refer to Patent Document 1).
In addition, in plastic working such as forging and extrusion, in addition to the pressure generated in the mold as described above, it is desired to measure the friction force acting on the surface of the mold as the material to be processed is deformed. Therefore, there is a technique disclosed in Patent Document 2 as a technique used to measure the pressure and friction force generated in the mold. Patent Document 2 discloses a sensor capable of measuring a frictional force in addition to a pressure with respect to a force acting on a surface of a predetermined member (hereinafter referred to as “tool”) which is a tool such as a mold. Yes.

The sensor disclosed in Patent Document 2 is attached to two thin beams that are continuously provided in a thin portion formed on the surface of the tool, a thin plate that connects the lower ends of the two beams, and the thin plate. And a strain gauge provided. With such a configuration, at least one of pressure and friction force acting on the surface of the member is measured.
Specifically, when pressure or frictional force acts on the thin portion, deformation such as deflection occurs in the thin portion. The deformation of the thin portion is transmitted to the thin plate connecting the two beams together with the deformation of the two beams. This deformation of the thin plate is detected by a strain gauge. That is, the deformation of the thin portion due to the action of pressure or frictional force is detected by the strain gauge as the strain amount (stretching amount) of the thin plate via the two beams. Then, based on the strain amount of the thin plate, the pressure / friction force acting on the surface of the tool is measured.

However, the configuration disclosed in Patent Document 2 (hereinafter referred to as “conventional configuration”) has the following problems.
That is, in the conventional configuration, a thin portion that is a portion to be deformed by the action of pressure and frictional force to be measured is formed integrally with the tool (directly on the tool). Therefore, the two beams provided continuously in the thin portion and the thin plate connecting these two beams are also an integral part of the tool. That is, in the conventional configuration, the sensor is provided directly on the tool. For this reason, in order to form the shape of each part constituting the sensor (hereinafter referred to as “sensor shape”), the tool needs to be directly processed.

  For direct machining of such tools, electrical discharge machining, which is a machining method that utilizes the consumption of electrodes when discharging in a liquid, is preferably used. As described above, a sensor is provided directly on the tool. In the configuration to be obtained, complicated machining is required with respect to the movement path of the electrode and the like for electric discharge machining, which is machining for forming the sensor shape. Specifically, when the sensor shape in the conventional configuration is formed, the movement path of the electrode is in addition to the direction in which the electrode is inserted into the hole formed in the tool (longitudinal direction of the beam). Movement in a plurality of directions such as the vertical direction (the direction along the plate surface of the thin plate) is required, which is a complicated process.

For this reason, in the conventional configuration, the processing lead time is long and the processing cost is high for processing for providing a sensor on the tool.
Moreover, in the conventional structure, about the process for providing a sensor in a tool, the process will be given inside a tool. For this reason, it becomes difficult to measure and confirm the dimensional accuracy (processing accuracy) after processing and to paste the strain gauge after processing.
In addition, in the conventional configuration, since the movement path of the electrode is complicated, the electrode is in contact with a part other than the processing part during processing, so that a part that does not need to be processed is processed, and the defect rate is about 10%. There was a defective product.
Furthermore, in the sensor of the conventional configuration, since the machining is performed directly on the tool, the position where the sensor is provided is greatly restricted and the degree of freedom is low.

In the sensor disclosed in Patent Document 2, as a measurement principle, a strain (pressure strain / friction force strain) of a thin plate due to pressure / friction force acting on a thin portion is measured by a strain gauge. Thus, a technique that can obtain pressure and frictional force is used.
In this regard, in the conventional configuration, the output (strain amount) of the frictional force strain is smaller than the pressure strain due to the sensor shape and the like. It is expected that the increase in output with respect to the frictional force strain is achieved by reducing the thickness of the thin plate to which the strain gauge is attached. However, a reduction in the thickness of the thin plate is accompanied by a decrease in strength of the thin plate portion. For this reason, in the conventional configuration, regarding the relationship between the output of the frictional force strain and the strength of the thin plate portion, the thickness of the thin plate portion is set based on the compromise between the output and the strength. .

  Further, it is expected that the increase in the output with respect to the frictional force strain is also achieved from the shape aspect of the sensor shape. However, in the conventional configuration, as described above, the processing for providing the sensor is performed inside the tool, so that the degree of freedom of the shape that can be processed is low. The low degree of freedom of the shape that can be processed with respect to the sensor shape is a factor that hinders an increase in the output with respect to the frictional force strain from the shape surface with respect to the sensor shape.

Thus, in the conventional configuration, it is desired to ensure both sufficient strength for the thin plate portion to which the strain gauge is attached and an increase in output for frictional force strain.
JP-A-8-75579 Japanese Patent No. 3632089

  The present invention has been made in view of the above problems, and the problem to be solved is to configure a sensor when detecting pressure and frictional force acting on the surface of a tool such as a mold. Pressure / friction force sensor and pressure / friction which can solve problems when complex machining is required, such as long machining lead time and high machining cost. It is to provide a force detection method.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

  In other words, in claim 1, a pressure / friction force sensor for detecting at least one of pressure and friction force acting on a surface of a predetermined member, which is a plate-like portion, on one plate surface side A base that receives the action of the detection target via a receiving surface that is formed; and at least a pair of beam elements that protrude from the other plate surface side of the base and that are provided substantially symmetrically with respect to the center position of the base. One or a plurality of beam portions, a plate-like portion that is substantially parallel to the base portion, and a thin plate portion that connects the tip portions of the pair of beam elements, and at least a portion thereof is positioned on the thin plate portion. The strain gauge is provided with respect to the predetermined member so as to form a part of the surface.

  According to a second aspect of the present invention, there is provided a pressure / friction force sensor for detecting at least one of a pressure and a friction force acting on a surface of a predetermined member, which is a plate-like portion, and is formed on one plate surface side. A base portion that receives the action of the detection target via a receiving surface, and a beam portion that protrudes from the other plate surface side of the base portion and has at least a pair of beam elements provided substantially symmetrically with respect to the center position of the base portion And the receiving surface is provided so as to form a part of the surface with respect to the predetermined member.

  According to a third aspect of the present invention, in the pressure / friction force sensor according to the first or second aspect, the pair of beam elements are opposed to the base portion of the beam element at a base portion of the beam portion with respect to the base portion. It has a rigidity reduction part for reducing the bending rigidity in the direction.

  According to a fourth aspect of the present invention, in the pressure / friction force sensor according to the third aspect, the rigidity reduction portion is a concave surface portion having an R shape.

  According to a fifth aspect of the present invention, in the pressure / friction force sensor according to any one of the first to fourth aspects, the pair of beam elements are substantially parallel to each other in a protruding direction from the base portion.

  According to a sixth aspect of the present invention, in the pressure / friction force sensor according to the fifth aspect, the beam portion has a shape along a cylindrical surface shape in which a protruding direction from the base portion is a cylinder axis direction.

  8. The pressure / friction force detection method for detecting at least one of pressure and friction force acting on the surface of a predetermined member, which is a plate-like portion and formed on one plate surface side. A base that receives the action of the detection target via a receiving surface, and a beam that protrudes from the other plate surface side of the base and has at least a pair of beam elements provided substantially symmetrically with respect to the center position of the base One or a plurality of plate portions, a plate-like portion substantially parallel to the base portion, and a thin plate portion that connects the tip portions of the pair of beam elements, and at least a portion thereof is located in the thin plate portion A sensor including a strain gauge, and a hole for attaching the sensor is provided in the predetermined member, and the sensor is formed in the hole, and the receiving surface forms a part of the surface. Provided in the receiver According to the detection target to act on the surface, the deformation of the thin portion through said beam portion, by detecting by the strain gauge unit, and detects the detection target which acts on said surface.

  9. The pressure / friction force detection method for detecting at least one of pressure and friction force acting on the surface of a predetermined member, which is a plate-like portion and formed on one plate surface side. A base that receives the action of the detection target via a receiving surface, and a beam that protrudes from the other plate surface side of the base and has at least a pair of beam elements provided substantially symmetrically with respect to the center position of the base A hole for attaching the sensor is provided in the predetermined member, the sensor is provided in the hole, and the receiving surface forms a part of the surface. The detection target that acts on the surface is detected on the basis of the inclination angle of the beam element by the detection target acting on the receiving surface.

  9. The pressure / friction force detection method according to claim 7 or claim 8, wherein the pair of beam elements are opposed to the base portion of the beam element at a base portion of the beam portion with respect to the base portion. The rigidity reduction part for reducing the bending rigidity about the direction to perform is provided.

  According to a tenth aspect of the present invention, in the pressure / friction force detection method according to the ninth aspect, the rigidity reduction portion is a concave surface portion having an R shape.

  According to an eleventh aspect of the present invention, in the pressure / friction force detection method according to any one of the seventh to tenth aspects, the pair of beam elements are substantially parallel to each other in a protruding direction from the base portion.

  According to a twelfth aspect of the present invention, in the pressure / friction force detection method according to the eleventh aspect, the beam portion has a shape along a cylindrical surface shape in which a protruding direction from the base portion is a cylinder axis direction. is there.

As effects of the present invention, the following effects can be obtained.
That is, according to the present invention, when detecting the pressure / friction force acting on the surface of a tool such as a mold, processing for configuring the sensor is facilitated, processing lead time is increased, and processing cost is increased. This makes it possible to eliminate problems that occur when complicated machining is required.

The pressure / friction force sensor (hereinafter simply referred to as “sensor”) according to the present invention is a predetermined member such as a mold during plastic processing such as forging, extrusion, or rolling, or molding processing such as injection molding or press molding. The detection target is at least one of pressure and frictional force acting on the surface. The sensor according to the present invention is configured as a separate body from the predetermined member, and is provided to form a part of the surface of the predetermined member. The sensor in a state in which a part of the surface of the predetermined member is formed receives pressure and frictional force acting on the surface of the predetermined member together with this surface, so that the pressure and frictional force acting on the surface of the predetermined member are obtained. Is detected.
Hereinafter, embodiments of the sensor according to the present invention will be described. In the following description, the predetermined member provided with the sensor is a mold used for forging or the like.

A first embodiment of a sensor according to the present invention will be described.
As shown in FIGS. 1 to 3, the sensor 1 according to the present embodiment uses at least one of pressure and frictional force acting on the surface of a mold (hereinafter referred to as “mold surface”) 10 as a detection target. That is, the sensor 1 can detect both pressure and friction force in addition to detecting either pressure or friction force acting on the mold surface 10.
The sensor 1 includes a base portion 2, a beam portion 3, a thin plate portion 4, and a strain gauge 5.

The base 2 is a plate-like part and receives the action of the detection target via a receiving surface 6 formed on one plate surface side.
In the present embodiment, the base portion 2 is formed as a disk-shaped portion. That is, the base portion 2 has circular plane portions that are substantially parallel to each other, and the flat portion on one side thereof serves as the receiving surface 6.

In addition, in this embodiment, although the base 2 is a disk-shaped part, it is not limited to this. The base 2 may be a plate-like portion whose one side plate surface becomes the receiving surface 6. Accordingly, the base 2 may be another plate-like portion such as a rectangular plate-like portion.
In the following description, the side where the receiving surface 6 is provided in the base 2 (upper side in FIG. 2) is the upper side of the sensor 1, and the opposite side (lower side in FIG. 2) is the lower side.

The beam portion 3 has a beam 7 that is at least a pair of beam elements protruding from the other plate surface side (lower side) of the base portion 2 and provided substantially symmetrically with respect to the center position of the base portion 2.
In the present embodiment, the beam portion 3 has a pair of beams 7. As shown in FIG. 2 and FIG. 3, each beam 7 is a rectangular plate-like portion that protrudes downward from a back side surface 8 that is a surface opposite to the receiving surface 6 in the base portion 2. The pair of beams 7 are provided substantially symmetrically (substantially left-right symmetrically in the drawing) with respect to the center position of the rear side surface 8 at a substantially central portion of the circular rear side surface 8.

In the present embodiment, the pair of beams 7 constituting the beam portion 3 are substantially parallel to each other in the protruding direction from the base portion 2.
That is, as described above, the pair of beams 7 that are plate-like portions are provided in a state in which the plate surfaces face each other substantially in parallel. Accordingly, each beam 7 is a portion protruding in a substantially vertical direction from the plate surface (back side surface 8) of the base 2.

  In the present embodiment, the pair of beams 7 constituting the beam portion 3 are formed as plate-like portions provided substantially parallel to each other, but the present invention is not limited to this. The pair of beams 7 may be beam elements provided substantially symmetrically with respect to the center position of the base portion 2. Therefore, the beam 7 may be a beam element having another shape such as a rod shape.

The thin plate portion 4 is a plate-like portion substantially parallel to the base portion 2, and connects the tip portions of the pair of beams 7.
As described above, the thin plate portion 4 is in a state of being laid substantially parallel to the base portion 2 between the distal end portions (lower end portions) of the pair of beams 7 which are plate-like portions provided substantially parallel to each other. It is formed as a plate-like part. Therefore, the thin plate part 4 forms a rectangular window part (through-hole part) whose longitudinal direction is the longitudinal direction together with the base part 2 (the back side face 8) and the pair of beams 7. In other words, a rectangular penetrating space is formed by the back side surface 8 of the base portion 2, the inner side surfaces of the beams 7 facing each other, and the upper side surface of the thin plate portion 4.

  Further, in the present embodiment, as shown in FIG. 3, the thin plate portion 4 has a substantially central portion between the pair of beams 7 in the short direction (vertical direction in FIG. 3) of the beam 7 having a rectangular plate shape. Provided to connect. Therefore, as shown in FIG. 3, when the sensor 1 is viewed from the bottom, the thin plate portion 4 and the pair of beams 7 form a substantially H shape. Hereinafter, in the sensor 1, a bottom surface thereof, that is, an end surface having a substantially H shape formed by the thin plate portion 4 and the pair of beams 7 is referred to as a front end surface 9.

The strain gauge 5 is provided so that at least a part thereof is positioned on the thin plate portion 4.
The sensor 1 of the present embodiment has two strain gauges 5. Each strain gauge 5 is provided in the vicinity of a connecting portion between each beam 7 constituting the beam portion 3 and the thin plate portion 4. These strain gauges 5 are provided by being attached to the distal end surface 9 using an adhesive or the like. Further, in the sensor 1, the two strain gauges 5 are provided substantially symmetrically with respect to the center position in the longitudinal direction of the thin plate portion 4, that is, the direction in which the pair of beams 7 are opposed (the left-right direction in FIGS. 2 and 3). It is done.

  Therefore, in this embodiment, as shown in FIG. 2 and FIG. 3, the two strain gauges 5 are arranged in the vicinity of the connecting portion between the thin plate portion 4 and the respective beams 7 on the tip end surface 9. It sticks in the position which straddles a part and the part of each beam 7. FIG.

  As the strain gauge 5, an electric resistance type or a piezoelectric element is used. Each strain gauge 5 is connected via a cable (lead wire) to a known measuring device (not shown) including an amplifier, an output unit, and the like.

  In addition, although the sensor 1 of this embodiment is provided with the two strain gauges 5 and these are affixed on the front end surface 9, it is not limited to this. The strain gauge 5 should just be provided so that the deformation | transformation (mechanical distortion) of the thin plate part 4 via the beam part 3 by a pressure and a frictional force acting on the receiving surface 6 of the base 2 may be detected. Therefore, the strain gauge 5 is not particularly limited as long as the strain gauge 5 can detect the deformation of the thin plate portion 4 as described above, and a known strain gauge configuration can be used. Further, the strain gauge 5 may be provided on the upper surface (the surface opposite to the tip surface 9) of the thin plate portion 4.

  In the sensor 1 having these configurations, the base 2, the beam 3, and the thin plate 4 are configured as an integral structure. That is, for each part of the base 2, the beam part 3, and the thin plate part 4 constituting the sensor 1, the shape of each part ( (Hereinafter referred to as “sensor shape”) is formed, and the body of the sensor 1 (hereinafter referred to as “sensor body”) as an integral structure is formed. And the sensor 1 is comprised by affixing the strain gauge 5 to the front end surface 9 with respect to this sensor main body.

  As the material constituting the sensor body, for example, the same material as that constituting the mold on which the sensor 1 is provided is used. However, the material constituting the sensor body can withstand the pressure and frictional force acting on the mold surface 10 during the molding of the workpiece, and the difference in thermal expansion coefficient from the material constituting the mold is relatively small. There is no particular limitation as long as processing for forming the sensor shape is possible.

  The sensor 1 having the above configuration is provided such that the receiving surface 6 forms a part of the mold surface 10 with respect to the mold.

A configuration for mounting the sensor 1 to the mold will be described with reference to FIG.
FIG. 4A is a diagram illustrating a disassembled state of the sensor 1 with respect to the mold 11, and FIG. 4B is a diagram illustrating a mounted state of the sensor 1 with respect to the mold 11.

  As shown in FIG. 4A, when the sensor 1 is attached to the mold 11, a hole 12 for attaching the sensor 1 is provided in the mold 11. In the present embodiment, the sensor 1 is attached by being press-fitted into the hole 12 of the mold 11.

  That is, when the sensor 1 is press-fitted into the hole 12, the portion of the base 2 becomes a press-fitted portion into the hole 12. Therefore, the hole portion 12 has a press-fit surface portion 12 a that follows the shape of the base portion 2 at the opening side end portion (end portion on the mold surface 10 side). In such a configuration, the sensor 1 is inserted into the hole portion 12 from the distal end side of the beam portion 3, and the base portion 2 is press-fitted into the press-fit surface portion 12a, so that the base portion 2 is inserted into the press-fit surface portion 12a. It will be in the state engaged with. Thereby, the sensor 1 is attached in a state of being fixed to the mold 11.

  Further, a portion of the hole 12 other than the press-fit surface portion 12a (hereinafter referred to as “hole portion”) has at least the following size and shape. That is, the beam portion 3 and the thin plate portion 4 and the strain gauge 5 of the sensor main body are located in the hole portion in the hole portion 12. In each part of the sensor main body, deformation such as deflection occurs due to the receiving surface 6 receiving the action of pressure and frictional force. The deformation of each part of the sensor main body is detected by the strain gauge 5, whereby the pressure / friction force acting on the mold surface 10 is detected. Therefore, the hole portion of the hole portion 12 has such a size and shape as to ensure a space that does not hinder the deformation of the beam portion 3 and the thin plate portion 4 due to the pressure or the like acting on the receiving surface 6. .

  Thus, the sensor 1 is attached to the mold 11 as shown in FIG. 4B by press-fitting the sensor 1 into the hole 12 of the mold 11 through the base 2. It becomes a state. In such a state, the receiving surface 6 serving as the upper surface of the base portion 2 is in a state of forming a part of the mold surface 10. In other words, when the sensor 1 is press-fitted into the mold 11, the receiving surface 6 is flush with the planar portion of the mold surface 10.

The sensor 1 fixed to the mold 11 by being press-fitted into the hole 12 can be attached to and detached from the mold 11.
Specifically, the hole 12 provided in the mold 11 is formed as a through hole. That is, the hole 12 is formed so as to open also on the side opposite to the mold surface 10 side. And the sensor 1 of the state press-fit in the metal mold | die 11 is removed from the metal mold | die 11 as follows. That is, the sensor 1 in a state of being press-fitted into the mold 11 is pressed through, for example, the back side surface 8 of the base portion 2 from the opening portion of the hole portion 12 opposite to the mold surface 10 side. As a result, the sensor 1 is pushed out to the mold surface 10 side of the hole 12, the engagement with the press-fitting surface portion 12 a of the base 2 that is a press-fitting portion of the sensor 1 is released, and the sensor 1 is removed from the mold 11. Thus, the sensor 1 of this embodiment is configured to be detachable from the mold 11.

  In the present embodiment, the attachment method (fixing method) of the sensor 1 to the mold 11 is press-fitting to the mold 11 of the sensor 1, but is not limited to this. As a method of attaching the sensor 1 to the mold 11 (fixing method), for example, welding or fastening with a bolt or the like can be considered in addition to press-fitting.

Thus, the detection principle of the pressure and frictional force in the sensor 1 provided in the metal mold | die 11 is demonstrated using FIG. 5 and FIG.
FIG. 5A is an explanatory diagram of the pressure detection principle, and FIG. 5B is an explanatory diagram of the friction force detection principle. FIG. 5 shows a cross section of the sensor body. FIG. 6A shows an example of a graph showing the relationship between the plate length (mm) and the pressure strain (με), and FIG. 6B shows the plate length (mm) and the frictional force strain. It is a figure which shows an example of the graph showing the relationship with ((micro | micron | mu)).

Here, with respect to the graph shown in FIG. 6, the “flat plate length” is the direction in which the thin plate portion 4 is laid between the beams 7 on the tip surface 9 where the strain gauge 5 is provided (hereinafter referred to as “flat plate length direction”). .) Is indicated. In other words, the “flat plate length” here, as shown in FIG. 3, is one end (left side in FIG. 3) of one end (reference) in the flat plate length direction (left and right direction in FIG. 3) of the tip surface 9. This is the length to the end (see the reference line O2) on the other side (right side in FIG. 3) with the reference (0 mm) as the reference (0 mm). By this flat plate length, the position of the front end surface 9 in the flat plate length direction is specified. Therefore, each graph shown in FIG. 6 shows the relationship between the position of the front end surface 9 in the length direction of the flat plate and the magnitude of strain (strain amount) at that position. In this example, the flat plate length in the sensor 1 is 11 mm in total length.
In FIG. 5, for convenience of explanation, regarding the two strain gauges 5 included in the sensor 1 of the present embodiment, one strain gauge 5 shown on the left side is referred to as “strain gauge 5 a”, and the other strain gauge 5 shown on the right side. Is “strain gauge 5b”.

  As shown in FIG. 5 (a), for the sensor 1 in a state provided with respect to the mold 11, a certain amount of pressure (from the top) in the direction substantially perpendicular to the receiving surface 6 of the base portion 2 (from the top) (See A1). In this case, the base portion 2 is bent and deformed so as to protrude downward. In response to the deformation of the base portion 2, both the beams 7 are bent and deformed at a similar rate so as to be convex outward.

  Accordingly, the thin plate portion 4 which is a portion connecting the both beams 7 receives the influence of strain deformation of both beams 7 substantially symmetrically with respect to the center position in the plate length direction. As a result, the same amount of strain output is obtained from both strain gauges 5a and 5b provided substantially symmetrically (hereinafter simply referred to as “substantially left-right symmetric”) with respect to the center position in the flat plate length direction on the front end surface 9. can get.

Thus, an example of the relationship between the flat plate length and the strain amount (strain amount of pressure strain) when pressure acts on the receiving surface 6 of the sensor 1 is a graph shown in FIG.
The graph shown in FIG. 6A is based on a calculation result by CAE (Computer Aided Engineering) when a pressure of 1000 MPa is applied to the receiving surface 6 in the direction of the arrow A1 in FIG. This shows the relationship between the plate length and strain.

  As can be seen from FIG. 6A, the graph of the strain amount when pressure is applied to the receiving surface 6 of the sensor 1 is the center position in the flat plate length direction on the tip surface 9 (in this example, the flat plate length). Is substantially symmetrical with respect to the position of 5.5 mm. That is, with respect to the pressure strain, the amount of strain is substantially the same at a position that is substantially symmetric with respect to the center position in the flat plate length direction on the distal end surface 9.

  Specifically, in this example, which is a case where pressure is applied to the receiving surface 6, about 2 mm inside from both ends (0 mm position and 11 mm position) in the length direction of the flat plate on the tip surface 9. Up to the position (position of about 2 mm and position of about 9 mm), the strain amount gradually increases from about 100 με as a negative strain amount (shrinkage amount) to about −2000 με. And about the intermediate | middle part (range of about 2-9 mm) in the meantime, the distortion | strain amount is a substantially constant value at about -2000microepsilon.

  As described above, it is known from the calculation result using the CAE that the same amount of output can be obtained from the two strain gauges 5a and 5b provided substantially symmetrically with respect to the strain amount of the pressure strain.

  On the other hand, as shown in FIG. 5B, the sensor 1 in the state provided for the mold 11 is substantially parallel to the plate length direction with respect to the receiving surface 6 of the base 2 (from left to right). Suppose that a certain amount of frictional force (see arrow A2) is applied. In this case, the base 2 is deformed so as to fall down on the upstream side (left side) of the frictional force and to warp upward on the downstream side (right side). In accordance with the deformation of the base portion 2, both beams 7 positioned on the upstream side and the downstream side of the frictional force are deformed so as to be inclined in the same direction.

  Along with this, the thin plate portion 4 that is a portion connecting the two beams 7 is flexibly deformed, and the strain amount is output as a positive strain amount (elongation amount) by the left strain gauge 5a. It is output as a negative strain amount (shrink amount) by the gauge 5b. The output regarding the strain amount obtained from each of the strain gauges 5a and 5b has the same magnitude (absolute value) since both strain gauges 5a and 5b are provided substantially symmetrically.

Thus, an example of the relationship between the plate length and the amount of strain (strain amount of frictional force strain) when the frictional force is applied to the receiving surface 6 of the sensor 1 is shown in the graph shown in FIG. is there.
The graph shown in FIG. 6B shows the plate length and strain based on the calculation results by CAE when a frictional force of 300 MPa is applied to the receiving surface 6 in the direction of arrow A2 in FIG. It shows the relationship with quantity.

  As can be seen from FIG. 6B, the graph of the strain amount when the frictional force is applied to the receiving surface 6 of the sensor 1 is the center position in the plate length direction on the tip surface 9 (in this example, the flat plate). It is substantially point-symmetric with respect to the position where the length is 5.5 mm) and the strain amount is 0 με. That is, with respect to the frictional force strain, at a position that is substantially symmetric with respect to the center position in the flat plate length direction on the distal end surface 9, the strain amount is a value that is approximately the same, with the sign being reversed.

  Specifically, in this example, which is a case where a frictional force is applied to the receiving surface 6, a position about 2 mm (about 2 mm) from the left end (0 mm position) in the flat plate length direction on the front end surface 9. The strain amount gradually increases from about 0 με to a positive value strain amount (elongation amount) up to about 220 με. Further, from the right end (11 mm position) in the flat plate length direction on the tip surface 9 to a position of about 2 mm (position of about 9 mm), the strain amount is from about 0 με to a negative strain amount (contraction amount). ) Gradually increases to about −220 με. And about the intermediate part (range of about 2-9 mm) in the meantime, the value of frictional force distortion has a substantially proportional relationship with the flat plate length, and from about 220 με as the flat plate length increases. It is as small as about −220 με. Therefore, the value of the frictional force strain in this example is a maximum near 2 mm and a minimum near 9 mm.

  As described above, with respect to the strain amount of the frictional force strain, it is calculated using CAE that outputs of the same magnitude can be obtained from both strain gauges 5a and 5b provided substantially symmetrically. We know from the results.

  Based on the relationship between the strain amount and the flat plate length for each of these pressures and frictional forces, the pressures and frictional forces are detected from the outputs of the two strain gauges 5a and 5b provided substantially symmetrically as follows.

That is, when detecting the pressure, the sum of the outputs of the two strain gauges 5a and 5b is taken. That is, by summing the outputs of both strain gauges 5a and 5b, the amount of strain for the frictional force that is opposite in polarity and output of the same magnitude is canceled as described above, and the strain for pressure is offset. The amount is detected.
Further, when detecting the frictional force, the difference between the outputs of the two strain gauges 5a and 5b is taken. That is, by taking the difference between the outputs of the two strain gauges 5a and 5b, the strain amount for the pressure having the same level of output is canceled as described above, and the strain amount for the friction force is detected.

  Thus, the pressure and friction force detected by the sensor 1 provided in the mold 11 are detected as pressure and friction force acting on the mold surface 10. That is, according to the sensor 1, the pressure and frictional force acting on the mold surface 10 can be detected simultaneously.

  As described above, in the present embodiment, as a pressure / friction force detection method for detecting at least one of pressure and friction force acting on the mold surface 10, the action of pressure / friction force via the receiving surface 6 is performed. A sensor 1 is used that includes a base 2 that receives the beam, a beam 3 having a pair of beams 7, a thin plate 4 that couples the pair of beams 7, and two strain gauges 5. A hole 12 for mounting the sensor 1 is provided in the mold 11, and the sensor 1 is provided in the hole 12 so that the receiving surface 6 forms a part of the mold surface 10. As a result, the deformation of the thin plate portion 4 via the beam portion 3 due to the pressure / friction force acting on the receiving surface 6 is detected by the strain gauge 5, and the pressure / friction force acting on the mold surface 10 is detected. The

  According to the sensor 1 of the present embodiment, when detecting the pressure / friction force acting on the mold surface 10, the processing for configuring the sensor 1 is facilitated, the processing lead time is increased, and the processing cost is increased. This makes it possible to eliminate problems that occur when complicated machining is required.

That is, according to the sensor 1 of the present embodiment, when the sensor is provided on the mold 11, it is not necessary to directly process the mold 11 to form the sensor shape, and the sensor 1 is configured. Therefore, it becomes easy to process.
Specifically, in the sensor 1 of the present embodiment, for example, when a window portion (through hole portion) formed by the base portion 2, the beam portion 3, and the thin plate portion 4 is provided for the sensor shape, a wire cut is used. It becomes possible to process. For this reason, the complicated electric discharge machining like the conventional one becomes unnecessary, and the machining lead time can be shortened. Moreover, since processing by a simple processing method is possible, processing costs can be reduced.

Moreover, since the sensor 1 of this embodiment is comprised separately from the metal mold | die 11, the measurement and confirmation of the dimensional accuracy (processing accuracy) after a process about a sensor shape become easy. Thereby, the precision about a sensor shape can be improved. Similarly, since the sensor 1 is configured as a separate body from the mold 11, it is easy to attach the strain gauge 5 to the sensor body after processing the sensor shape of the sensor body.
Further, according to the sensor 1 of the present embodiment, since it is not necessary to directly process the mold 11 in order to form the sensor shape, a defective product due to unnecessary processing on the mold 11 is performed. Can be prevented.

  In addition, since the sensor 1 of this embodiment is attached to the mold 11 from the mold surface 10 side, the sensor 1 can be any part of the mold 11 where the above-described hole 12 can be provided by processing. Can be provided. For this reason, there are few restrictions about the position where the sensor 1 is provided, and a high degree of freedom can be obtained with respect to the attachment site of the sensor 1.

Specifically, for example, as shown in FIG. 7, the sensor 1 is provided for the mold 11. FIG. 7 shows a mold 11 used for molding a workpiece 15 having a plate-like portion 15a and a convex portion 15b protruding from one side of the plate-like portion 15a. Therefore, the mold 11 has a flat surface portion 10A used for forming the plate-like portion 15a, a slope portion 10B and a bottom surface portion 10C used for forming the convex portion 15b, as the mold surface 10 serving as a forming surface for the work 15. Have And the sensor 1 is provided with respect to each of the plane part 10A in this metal mold | die surface 10, the slope part 10B, and the bottom face part 10C. That is, a hole 12 is provided in each of the parts forming the mold surface 10, and the sensor 1 is provided for each hole 12.
Thus, the sensor 1 of the present embodiment can be attached to the mold 11 from the mold surface 10 side with a high degree of freedom together with the processing of the hole 12.

A second embodiment of the sensor according to the present invention will be described. In addition, below, about the part which overlaps with 1st embodiment, the description is abbreviate | omitted using the same code | symbol.
The sensor 21 of the present embodiment has a shape portion for improving the output from the strain gauge 5 with respect to the pressure strain and the frictional force strain with respect to the sensor 1 of the first embodiment. Here, regarding the pressure strain and the frictional force strain, the increase in the output from the strain gauge 5 will be described using the example of the graph shown in FIG. This corresponds to an increase in the range of values taken by the strain amount at 11 mm).

Therefore, as shown in FIG. 6 (a), with respect to pressure strain, the width of the value that the strain takes when pressure is applied to the receiving surface 6 is the minimum value (about −2000 με) of the pressure strain value. The width of the value is between the maximum values (about 100 με) (see arrow range B1). That is, the larger the value indicated by the arrow range B1 in FIG. 6A, the greater the output from the strain gauge 5 for pressure strain.
Similarly, as shown in FIG. 6 (b), with respect to the frictional force strain, the width of the value taken by the amount of strain due to the frictional force acting on the receiving surface 6 is the minimum value (about approx. The width of the value is between about −220 με at a position of 9 mm and the maximum value (about 220 με at a position of about 2 mm) (see arrow range B2). That is, as the width of the value indicated by the arrow range B2 in FIG. 6B is larger, the output from the strain gauge 5 regarding the frictional force strain is larger.

  As for the output from the strain gauge 5, since the output for the friction force strain is smaller than the pressure strain, it is desired to improve the output for the friction force strain.

  Therefore, as shown in FIG. 8, the sensor 21 according to the present embodiment reduces the bending rigidity in the direction in which the pair of beams 7 face the base 2 of the beam 7 at the base portion of the beam 3 with respect to the base 2. The rigidity reduction part 22 for making it have.

  In this embodiment, the rigidity reduction portion 22 is a base portion of each beam 7 with respect to the base portion 2, and the width direction (see FIG. 8 in the depth direction) is formed. That is, by providing the rigidity reduction portion 22 by the groove portion 23, the base portion 2 and the beam 7 are partially thinned in the plate thickness direction at the base portion of the base portion 2 of each beam 7, whereby the base portion of the beam 7. The bending rigidity in the direction in which the pair of beams 7 face each other is reduced.

  Here, the direction in which the pair of beams 7 face each other (hereinafter referred to as “beam facing direction”), which is the direction in which the bending rigidity of the beam 7 with respect to the base 2 decreases, is the left-right direction in FIG. The direction corresponds to the length direction. That is, the beam facing direction is a direction in which the beam 7 is bent or tilted to cause distortion in the thin plate portion 4 when the receiving surface 6 receives the action of pressure or frictional force.

Thus, the rigidity reduction part 22 is provided in the base part of the beam part 3, and the output about a frictional force distortion can be increased.
That is, since the rigidity reduction portion 22 is provided, the bending rigidity of the beam 7 with respect to the base portion 2 in the beam facing direction is reduced, so that the amount of inclination of the beam 7 is increased by the frictional force acting on the receiving surface 6. . Along with this, the deformation amount of the thin plate portion 4 also increases, and the output of the strain gauge 5 increases.

The rigidity reduction portion 22 included in the sensor 21 of the present embodiment is provided by performing additional processing such as electric discharge machining or drilling with a drill or the like on the sensor 1 of the first embodiment.
When the processing for forming the sensor shape is performed directly on the mold 11 as in the prior art, the processing tools such as blades and electrodes are processed in the mold 11. Since it does not enter, it becomes difficult because the processing tool cannot be applied to the processing site. In this regard, in this configuration, since the sensor 21 is a separate body from the mold 11, it is easy to process the base portion of the beam portion 3, and the rigidity reduction portion 22 is easily provided.

Moreover, it is preferable that the rigidity reduction part 22 is a concave-surface part which has R shape.
That is, like the sensor 21 of this embodiment shown in FIG. 8, it is preferable that the groove part 23 which is the rigidity reduction part 22 turns into a round-hole-shaped part. In other words, it is preferable that the groove part 23 which is the rigidity reduction part 22 is formed as a concave part which becomes circular arc shape in the cross-sectional view of the direction shown in FIG.

  Thus, when the rigidity reduction part 22 is formed as a concave surface part having an R shape, in order to increase the output of the frictional force strain, the bending rigidity of the beam 7 in the beam facing direction is reduced. There is no reduction in strength at the base of the portion 3.

The effect obtained by providing the rigidity reduction portion 22 (groove portion 23) as a concave surface portion having an R shape will be described with reference to FIG. 9 by comparison with a configuration without the rigidity reduction portion 22.
In FIG. 9, for convenience of explanation, the portion on the left side of the center line C1 shows the case where the sensor has the rigidity reduction portion 22 (corresponding to the sensor 21 of the present embodiment), and the portion on the right side of the center line C1 is The case where the sensor does not have the rigidity reduction portion (corresponding to the sensor 1 of the first embodiment) is shown. FIG. 9A shows a state in which no force is applied to the receiving surface 6, and FIG. 9B shows a state in which a frictional force is applied to the receiving surface 6.

In the base portion of the beam portion 3, a portion where the stress due to the frictional force acting on the receiving surface 6 is maximized (hereinafter referred to as “stress maximum portion”) is provided by the rigidity reduction portion 22, whereby the receiving surface 6. Will move to the side.
That is, as shown in FIG. 9A, when the rigidity reduction portion 22 is not provided for the position of the maximum stress portion in the vertical direction, the position of the maximum stress portion is the position of the back side surface 8 of the base portion 2 ( (See alternate long and short dash line D1). On the other hand, when the rigidity reduction portion 22 is provided, the position of the maximum stress portion is the upper end position of the groove portion 23 (see the alternate long and short dash line D2). That is, by providing the rigidity-decreasing portion 22 by the groove portion 23, the maximum stress portion moves to the receiving surface 6 side by the amount that the groove portion 23 is formed (see arrow D3).

  As described above, when the maximum stress portion moves to the receiving surface 6 side, the strength of the base portion of the beam portion 3 is reduced as the plate thickness decreases. In this respect, the rigidity reduction portion 22 is provided as the groove portion 23 which is a concave surface portion having an R shape, so that stress concentration due to the application of frictional force is prevented at the base portion of the beam portion 3, and the strength reduction portion is reduced. Will be compensated, and the relative strength reduction between the beam part 3 and the base part 2 will not occur.

On the other hand, by providing the rigidity reduction portion 22 at the base portion of the beam portion 3, the bending rigidity of each beam 7 in the beam facing direction is reduced, and the beam 7 is tilted by the frictional force acting on the receiving surface 6. It becomes easy (flexible).
That is, as shown in FIG. 9B, it is assumed that a certain amount of frictional force (see arrow E1) acts on the receiving surface 6 substantially in parallel with the plate length direction (from the right side to the left side). . In this case, the inclination (deflection) of the beam 7 from the state in which no frictional force is applied to the receiving surface 6 is reduced in rigidity as compared with the size (see the angle θ1) when the rigidity reducing portion 22 is not provided. When the portion 22 is provided, the size (see the angle θ2) is larger. That is, by providing the rigidity reduction portion 22, the inclination of the beam 7 due to the frictional force acting on the receiving surface 6 increases as the bending rigidity of the beam 7 in the beam facing direction with respect to the base 2 decreases.

  As described above, the rigidity reduction portion 22 is provided, and the output of the frictional force strain increases as the inclination (deflection) of the beam 7 due to the frictional force acting on the receiving surface 6 increases.

  As described above, by providing the rigidity-decreasing portion 22 as the concave portion having the R shape, the beam 7 faces the beam 7 without decreasing the strength at the base portion of the beam portion 3 (while maintaining the strength). The bending stiffness in the direction can be reduced, and the output with respect to the frictional force strain can be increased.

In addition, the position, shape, etc. in which the rigidity reduction part 22 is provided are not limited to this embodiment.
For example, as shown in FIG. 10, the position where the rigidity reduction portion 22 is provided is a base portion of the base portion 2 of each beam 7, and is provided by forming a groove portion 23 on the outside of both beams 7. May be.
Further, the shape of the rigidity lowering portion 22 is not limited to the shape having the R shape like the groove portion 23 of the present embodiment, and other shapes such as a substantially rectangular shape in a sectional view in the direction shown in FIG. It may be a shape.
Further, as the rigidity reduction portion 22, the pair of beams 7 constituting the beam portion 3 may be provided for only one of the beams 7.

A third embodiment of the sensor according to the present invention will be described.
In the sensor 31 of the present embodiment, the beam portion 3 has a shape along a cylindrical surface shape in which the protruding direction from the base portion 2 is the tube axis direction.

That is, as shown in FIG. 11, in the sensor 31 of the present embodiment, each beam 7 constituting the beam portion 3 has an arc-shaped outer peripheral surface 7s as an outer surface thereof. And the outer peripheral surface 7s of these both beams 7 is formed so that a common cylindrical surface shape may be followed. In other words, the outer peripheral surface 7 s of both beams 7 that becomes the outer peripheral surface of the beam portion 3 has a partial shape of a common cylindrical surface shape. Therefore, as shown in FIG. 11, in the bottom view of the sensor 31, the outer peripheral surfaces 7s of both beams 7 have a shape along the virtual circle S1.
Thus, in the sensor 31 of the present embodiment, the beam portion 3 has a shape along the cylindrical surface shape in which the protruding direction from the base portion 2 (the depth direction in FIG. 11) is the cylinder axis direction.

  In the present embodiment, the two beams 7 are provided substantially symmetrically with respect to the center position of the back side surface 8 at a substantially central portion of the circular back side surface 8 with respect to the disc-shaped base 2. The cylinder axis imaginary for the cylindrical surface shape of the beam portion 3 is an axis (center axis) in a substantially vertical direction with respect to the disc-shaped base portion 2.

  Thus, when the beam part 3 has a shape along the cylindrical surface shape, machining using a rotary tool such as lathe machining is possible, and faster machining is possible. As a result, the machining lead time can be further shortened when machining to configure the sensor 31.

A fourth embodiment of the sensor according to the present invention will be described.
The sensor 41 of the present embodiment is configured not to include the thin plate portion 4 and the strain gauge 5 that connect the pair of beams 7 to the sensor 1 of the first embodiment.

  That is, as shown in FIG. 12, the sensor 41 of the present embodiment includes a base portion 2 and a beam portion 3 composed of a pair of beams 7.

The detection principle of the pressure and frictional force in the sensor 41 of this embodiment will be described with reference to FIG.
FIG. 13A is an explanatory diagram of the pressure detection principle, and FIG. 13B is an explanatory diagram of the friction force detection principle. Further, in FIG. 13, for convenience of explanation, regarding the two beams 7 included in the sensor 41 of the present embodiment, one beam 7 shown on the left side is referred to as “beam 7a” and the other beam 7 shown on the right side is referred to as “beam 7b”. "

  As shown in FIG. 13 (a), the sensor 41 in the state provided on the mold 11 has a certain pressure (arrow) in a direction substantially perpendicular to the receiving surface 6 of the base 2 (from above). Assume that F1) is activated. In this case, the base portion 2 is bent and deformed so as to protrude downward. In response to the deformation of the base portion 2, both the beams 7 a and 7 b are deformed so as to incline at the same rate toward the outside. That is, in this case, both beams 7a and 7b are inclined in different directions (opposite directions). Here, the inclination angle of each beam 7a, 7b is α.

  On the other hand, as shown in FIG. 13 (b), the sensor 41 in the state provided for the mold 11 is substantially parallel to the plate length direction with respect to the receiving surface 6 of the base 2 (from left to right). Suppose that a certain amount of frictional force (see arrow F2) is applied. In this case, the base 2 is deformed so as to fall down on the upstream side (left side) of the frictional force and to warp upward on the downstream side (right side). In accordance with the deformation of the base portion 2, both beams 7 a and 7 b positioned on the upstream side and the downstream side of the frictional force are deformed so as to be inclined at the same rate in the same direction. Here, the inclination angle of each of the beams 7a and 7b is β.

  Based on the deformation of the beams 7a and 7b for each of these pressures and frictional forces, the pressures and frictional forces are detected as follows.

That is, when the pressure and frictional force as described above are applied to the receiving surface 6 at the same time, the left beam 7a is deformed to be inclined at an inclination angle α + β, and the right beam 7b is inclined. It will deform | transform so that it may incline with angle (alpha)-(beta).
Therefore, when the pressure is detected, the sum of the inclination angles of the two beams 7a and 7b is taken. That is, by taking the sum of the tilt angles of both beams 7, the tilt angle for the frictional force is canceled out, and a value 2α is obtained for the tilt angle for the pressure. A pressure is detected based on the value of the tilt angle.
Further, when detecting the frictional force, a difference in inclination angle between the two beams 7a and 7b is taken. That is, by taking the difference between the tilt angles of the two beams 7, the tilt angle with respect to pressure is canceled out, and a value of 2β is obtained with respect to the tilt angle with respect to the frictional force. A frictional force is detected based on the value of the inclination angle.
In measuring the tilt angle of the beam 7, for example, a laser displacement meter or the like is used.

  As described above, in the present embodiment, as a pressure / friction force detection method for detecting at least one of pressure and friction force acting on the mold surface 10, the action of pressure / friction force via the receiving surface 6 is performed. A sensor 41 comprising a base 2 for receiving and a beam 3 having a pair of beams 7 is used. A hole 12 (see FIG. 4) for mounting the sensor 41 is provided in the mold 11, and the sensor 41 and the receiving surface 6 form a part of the mold surface 10 in the hole 12. It is provided as follows. Thus, the pressure / friction force acting on the mold surface 10 is detected based on the inclination angle of the beams 7a, 7b due to the pressure / friction force acting on the receiving surface 6.

In addition, it is preferable that the sensor 31 of the third embodiment and the sensor 41 of the fourth embodiment also have the rigidity reduction portion 22 as in the sensor 21 of the second embodiment.
Also in the sensor 41 of the fourth embodiment, similarly to the sensor 31 of the third embodiment, the beam portion 3 has a shape along the cylindrical surface shape in which the protruding direction from the base portion 2 is the tube axis direction. Further, the processing lead time can be further shortened.

Examples of the present invention will be described below.
This example relates to a sensor (hereinafter referred to as “sensor with additional machining”) having a rigidity-reducing portion 22 as a concave surface portion (groove portion 23) having an R shape like the sensor 21 of the second embodiment described above. This shows the effect on a sensor that does not have the rigidity-decreasing portion 22 as in the sensor 1 of the first embodiment (hereinafter referred to as “sensor without additional processing”).

  In this example, a pressure of 1000 MPa was applied to each of the sensor with additional work and the sensor without additional work in the direction as shown in FIG. 5A (see arrow A1). As for the frictional force, a frictional force of 300 MPa was applied in the direction shown in FIG. 5B (see arrow A2). In this embodiment, each sensor has a flat plate length of 11 mm.

The graph shown in FIG. 14 shows the plate length and strain amount (friction force strain) based on the calculation result by CAE when a frictional force of 300 MPa is applied to the sensor with additional processing and the sensor without additional processing. This shows the relationship.
In FIG. 14, a graph G1 indicated by using diamond-shaped points is for a sensor without additional machining, and a graph G2 indicated by using white square-shaped points is for a sensor with additional machining. It is.

As can be seen from the graph shown in FIG. 14, the width of the value taken by the strain amount (hereinafter referred to as “strain width”) in the entire range (0 to 11 mm) of the flat plate length for the sensor with additional processing is referred to as additional processing. It is larger than the strain width of the sensor without.
Specifically, the strain width of the sensor without additional machining is about 440 με (see the arrow range H1), whereas the strain width of the sensor with additional machining is increased to about 530 με (see the arrow range H2). ). In other words, in this example, the rigidity reduction portion 22 (groove portion 23) is provided in the sensor, so that the strain width with respect to the frictional force strain is increased by about 90 με. This shows that the output from the strain gauge 5 with respect to the friction force strain has increased by the amount of the strain width with respect to the friction force strain.

  In addition, the following calculation results were obtained by CAE analysis of the portion where the rigidity reduction portion 22 is provided in the sensor, that is, the strength (bending strength, unit MPa) of the stress maximum portion described above.

That is, when the pressure of 1000 MPa was applied, the strength of the maximum stress portion was 1500 MPa in the sensor without additional machining, and 1480 MPa in the sensor with additional machining.
Further, the strength of the maximum stress portion when a frictional force of 300 MPa was applied was 1600 MPa in the sensor without additional machining, and 1590 MPa in the sensor with additional machining.
From these results, it is understood that the strength of the maximum stress portion is hardly lowered even when the rigidity reduction portion 22 (groove portion 23) is provided in the sensor.

  As described above, according to the present embodiment, the sensor is provided with the rigidity reduction portion 22 as the concave surface portion (groove portion 23) having an R shape, thereby reducing the strength at the base portion (maximum stress portion) of the beam portion 3. The results showed that the output for the frictional force strain increased without accompanying.

The perspective view which shows the structure of the sensor which concerns on 1st embodiment of this invention. Similarly front view. Similarly bottom view. Explanatory drawing about the attachment structure with respect to the metal mold | die of a sensor. Explanatory drawing about the detection principle of a pressure and a frictional force. The figure which shows an example of the graph showing the relationship with the flat plate length about each of a pressure distortion and a frictional force distortion. The figure which shows the usage example of a sensor. The front fragmentary sectional view which shows the structure of the sensor which concerns on 2nd embodiment of this invention. Explanatory drawing about the effect by a rigidity fall part. The figure which shows the other example of a rigidity fall part. The bottom view which shows the structure of the sensor which concerns on 3rd embodiment of this invention. The front view which shows the structure of the sensor which concerns on 4th embodiment of this invention. Explanatory drawing about the detection principle of a pressure and a frictional force. The figure which shows the graph showing the relationship between the flat plate length and frictional force distortion about the Example of this invention.

Explanation of symbols

1, 2, 31, 41 Sensor 2 Base 3 Beam 4 Thin plate 5 Strain gauge 6 Receiving surface 7 Beam (beam element)
7a Outer peripheral surface 10 Mold surface 11 Mold 12 Hole portion 22 Rigidity reduced portion 23 Groove portion

Claims (12)

A pressure / friction force sensor for detecting at least one of pressure and friction force acting on a surface of a predetermined member,
A base part that is a plate-like part and receives the action of the detection target via a receiving surface formed on one plate surface side;
A beam portion that protrudes from the other plate surface side of the base portion and has at least a pair of beam elements provided substantially symmetrically with respect to the center position of the base portion;
A thin plate portion that is a plate-like portion substantially parallel to the base portion and connects the tip portions of the pair of beam elements;
One or a plurality of strain gauges provided so that at least a part is located in the thin plate portion,
The pressure / friction force sensor, wherein the receiving surface is provided so as to form a part of the surface with respect to the predetermined member. A pressure / friction force sensor for detecting at least one of pressure and friction force acting on a surface of a predetermined member,
A base part that is a plate-like part and receives the action of the detection target via a receiving surface formed on one plate surface side;
A beam portion protruding from the other plate surface side of the base portion and having at least a pair of beam elements provided substantially symmetrically with respect to the center position of the base portion,
The pressure / friction force sensor, wherein the receiving surface is provided so as to form a part of the surface with respect to the predetermined member.   The base portion of the beam portion with respect to the base portion includes a rigidity reduction portion for reducing bending rigidity of the beam element with respect to the base portion in a direction in which the pair of beam elements face each other. The pressure / friction force sensor according to claim 2.   The pressure / friction force sensor according to claim 3, wherein the rigidity reduction portion is a concave surface portion having an R shape.   The pressure / friction force sensor according to any one of claims 1 to 4, wherein the pair of beam elements are substantially parallel to each other in a protruding direction from the base portion.   The pressure / friction force sensor according to claim 5, wherein the beam portion has a shape along a cylindrical surface shape in which a protruding direction from the base portion is a cylinder axis direction. A pressure / friction force detection method for detecting at least one of pressure and friction force acting on a surface of a predetermined member,
A base part that is a plate-like part and receives the action of the detection target via a receiving surface formed on one plate surface side;
A beam portion that protrudes from the other plate surface side of the base portion and has at least a pair of beam elements provided substantially symmetrically with respect to the center position of the base portion;
A thin plate portion that is a plate-like portion substantially parallel to the base portion and connects the tip portions of the pair of beam elements;
Using one or a plurality of strain gauges provided so that at least a part thereof is located in the thin plate portion,
A hole for attaching the sensor is provided in the predetermined member,
In the hole, the sensor is provided so that the receiving surface forms a part of the surface,
The detection target acting on the surface is detected by detecting the deformation of the thin plate portion via the beam portion due to the detection target acting on the receiving surface by the strain gauge portion. To detect pressure and friction force. A pressure / friction force detection method for detecting at least one of pressure and friction force acting on a surface of a predetermined member,
A base part that is a plate-like part and receives the action of the detection target via a receiving surface formed on one plate surface side;
Using a sensor comprising: a beam part that protrudes from the other plate surface side of the base part and has at least a pair of beam elements provided substantially symmetrically with respect to the center position of the base part,
A hole for attaching the sensor is provided in the predetermined member,
In the hole, the sensor is provided so that the receiving surface forms a part of the surface,
A pressure / friction force detection method, wherein the detection target acting on the surface is detected based on an inclination angle of the beam element caused by the detection target acting on the receiving surface.   8. A rigidity lowering portion for reducing a bending rigidity in a direction in which the pair of beam elements face each other with respect to the base portion of the beam element is provided at a base portion of the beam portion with respect to the base portion. Alternatively, the pressure / friction force detection method according to claim 8.   The pressure / friction force detection method according to claim 9, wherein the rigidity reduction portion is a concave surface portion having an R shape.   The pressure / friction force detection method according to any one of claims 7 to 10, wherein the pair of beam elements have substantially parallel protrusion directions from the base portion.   The pressure / friction force detection method according to claim 11, wherein the beam portion has a shape along a cylindrical surface shape in which a protruding direction from the base portion is a cylinder axis direction.

Images