JP2010038340A - Impact energy absorbing member and fabrication method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impact energy absorbing member 1 superior in handling and capable of stably deforming a tublar body 2 in a tube axis Z direction without buckling and deforming it. <P>SOLUTION: The body 2 is formed integrally with deformable parts 3 and deformation control parts 4 being alternately laminated in the tube axis Z direction. The face of each deformation control part 4 in contact with the deformable part 3 is an inclined face 4a inclined to one side or the other side in the tube axis Z direction toward the radial outside of the body 2. Two selective inclined faces 4a adjacent to each other in the tube axis Z direction are inclined to mutually opposite sides toward the radial outside of the body 2 so that the deformable parts 3 are plastically deformed to the radial outside or inside of the body 2 concurrently with its compression and plastic deformation in the tube axis Z direction. On a boundary between each inclined face 3 and the deformable part 4, a shearing deformation accelerating layer 9 is formed to accelerate the shearing deformation of the inclined face 4a at the boundary-side end of the deformable part 3 when a certain or greater compressing load is input thereto. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention belongs to a technical field related to an impact energy absorbing member suitable for a crash can of a vehicle and the like and a method for manufacturing the same, which absorbs a compressive load input in a cylindrical axis direction with respect to a cylindrical main body.

  Conventionally, for example, a crash can has been provided as an impact energy absorbing member at the front end of the front side frame or the rear end of the rear side frame of the vehicle. It is well known to absorb (load).

In the impact energy absorbing member such as the crash can, various proposals have been made to improve the impact energy absorbing performance. For example, in Patent Document 1, a cylindrical main body portion of an impact energy absorbing member is arranged with at least one short cylindrical first part and at least one short cylinder arranged concentrically with respect to the first part. As a configuration including a cylindrical second portion and a portion where the connection portion between the first portion and the second portion is inclined with respect to the concentric axis, a compressive load is applied to the main body portion in the cylindrical axis direction. When it is input, the first portion is pushed into the inner hollow portion of the second member by reducing the diameter of the first portion and expanding the second portion. With this configuration, the occurrence of an unstable buckling phenomenon is suppressed to stabilize the deformation mode, thereby improving the impact energy absorption performance.
International Publication No. 2006/025559 Pamphlet

  However, in the thing of the said patent document 1, when a compressive load is input with respect to the main-body part in the cylinder axial direction, the 1st part and the 2nd part are separated by the connection part, and the 1st member is made into the 2nd member. When the first member is pushed into the inner hollow portion of the first member, the first member or the second member may be buckled and deformed without being smoothly pushed into the inner hollow portion of the second member, thereby stabilizing the impact energy absorbing member. It becomes difficult to deform. In order to surely prevent this buckling deformation, the lengths of the first and second portions need to be considerably shortened. In this case, if it is attempted to cope with the compressive load generated in the vehicle, , The number of first and second parts is considerably increased. Further, in order to smoothly push the first member into the inner hollow part of the second member, even if the first part and the second part are simply in contact or fixed, the fixing force is reduced. However, if the number of the first and second parts becomes considerably large as described above, the first part or the second part may fall off when the impact energy absorbing member is transported or assembled to a vehicle or the like. There is a problem that it is difficult to handle.

  The present invention has been made in view of such a point, and an object of the present invention is to stably deform the cylindrical main body portion in the main body cylinder axis direction without causing buckling deformation. Another object of the present invention is to provide an impact energy absorbing member excellent in handleability.

  In order to achieve the above object, the invention of claim 1 is directed to an impact energy absorbing member that has a cylindrical main body portion and absorbs a compressive load that is input to the main body portion in the cylinder axis direction. The main body portion is made of metal and receives at least a predetermined compressive load, and is subjected to compression plastic deformation in the main body portion cylindrical axis direction, and a plurality of deformations for controlling the direction of plastic deformation of the deformation portion. The control unit is integrally molded in a state where the control unit is alternately stacked in the main body cylinder axis direction, and the surface of the deformation control unit that comes into contact with the deformation unit is the main unit cylinder toward the outer side in the main unit radial direction. Any two inclined surfaces that are inclined to one side or the other side of the axial direction and are adjacent to the main body portion cylindrical axis direction when a compressive load greater than or equal to the predetermined value is input to the main body portion. The deformed portion is the same as the compressive plastic deformation in the main body portion cylindrical axis direction So as to be plastically deformed outward or inward in the main body portion radial direction, and inclined in opposite directions toward the outer side in the main body portion radial direction, and at the boundary between each of the inclined surfaces and the deformation portion, A shear deformation promoting layer that promotes shear deformation on the inclined surface at the boundary side end portion of the deformable portion when the compressive load of the predetermined value or more is input is formed.

  With the above configuration, when a predetermined or more compressive load is input to the main body in the cylinder axis direction, the deforming portion is simultaneously with the compressive plastic deformation in the main body portion cylinder axial direction by the inclined surface of the deformation control unit. Plastic deformation is performed outward or inward in the main body radial direction, and a compressive load (impact energy) can be absorbed by the plastic deformation of the deformed portion. In addition, since the deformed portion is deformed so that the length of the main body portion in the cylinder axis direction is shortened and spreads outward or inward in the main body portion radial direction, the entire main body portion is stable in the tube axis direction without causing buckling deformation. And deform. In addition, since a shear deformation promoting layer is formed at the boundary between the inclined surface and the deformed portion, the shear deformed promoting layer makes it easier for the deformed portion to be plastically deformed outward or inward in the main body radial direction. That is, when a compressive load of a predetermined value or more is input to the main body, the boundary side end of the deformed portion along the inclined surface is inclined at the boundary between the inclined surface and the deformed portion or in the vicinity thereof. A shearing force that shifts outward or inward in the main body radial direction acts. And, if the shear deformation promoting layer is made of a material that makes the boundary side end of the deformed part easy to shear deform with respect to the inclined surface, the boundary side end of the deformed part is inclined by the shearing force. As a result, the deformed portion is easily plastically deformed outward or inward in the main body radial direction.

  Therefore, even if a force is applied to the main body portion in the cylinder axis direction and a force that tilts the main body portion in the radial direction, the main body portion is unlikely to buckle and deform reliably in the cylinder axis direction. Thus, the compression load absorption performance can be enhanced. Even if the number of deformation parts and deformation control parts increases, the deformation parts and the deformation control parts can be firmly and easily fixed to each other by integral molding. It is possible to improve the handleability when assembling.

  The deformation control unit is, for example, a material that is more difficult to be plastically plastically deformed than a deformed part and is less likely to break than a deformed part with respect to a compressive load in the body axis direction, that is, a material that has higher strength and rigidity than the deformed part. What is necessary is just to comprise.

  According to a second aspect of the present invention, in the first aspect of the invention, each of the inclined surfaces compresses the deformed portion in the main body portion cylindrical axis direction when a compression load greater than or equal to the predetermined value is input to the main body portion. It shall be inclined so as to be plastically deformed inward in the radial direction of the main body at the same time as plastic deformation.

  As a result, the deformation resistance when the deformed portion plastically deforms inward in the main body radial direction is larger than the deformation resistance when plastically deforms outward, so that the amount of compressive load absorbed can be further increased. it can.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the shear deformation promoting layer is made of an alloy with the metal and having a melting point lower than that of the metal.

  That is, an alloy with a metal in the deformed portion and having a melting point lower than that of the metal (for example, when the metal is an aluminum alloy, a Zn-Al-based alloy) is usually low in strength. Due to the shearing force generated when a predetermined or more compressive load is input to the boundary, the boundary side end of the deformed portion is easily sheared with respect to the inclined surface. Further, when manufacturing the impact energy absorbing member, a deformation control unit forming member for forming the deformation control unit is prepared in advance, and the deformation control unit forming member is set in the cavity of the mold. When the deformed portion and the deformation control portion are integrally formed by supplying the molten metal of the deformable portion into the cavity, the end portion corresponding to the inclined surface in the deformation control portion forming member is made more than the metal. If composed of a low melting point plating material, a shear deformation promoting layer made of an alloy of the deformed part and an alloy having a lower melting point than the metal is easily formed at the boundary between the inclined surface and the deformed part. can do.

  In the invention of claim 4, in the invention of claim 1 or 2, the deformation part is made of an aluminum alloy casting, and the deformation control part and the shear deformation promoting layer are made of an aluminum alloy casting containing reinforcing fibers, It is assumed that the reinforcing fiber volume ratio of the shear deformation promoting layer is larger than the reinforcing fiber volume ratio of the deformation control unit.

  Thus, the deformation control unit is more difficult to compress and plastically deform than the deformed portion by the reinforcing fiber, and is less likely to break, and can reliably control the direction of plastic deformation of the deformed portion. Further, the impact energy absorbing member can be reduced in weight. Furthermore, as the deformation control part forming member, a preformed body made of a reinforcing fiber molded body is formed, and the preformed body and the molten aluminum alloy are combined to form the deformed part and the deformation control part. Can be easily formed integrally. Here, if the reinforcing fiber volume fraction of the end corresponding to the inclined surface in the preform is larger than the reinforcing fiber volume fraction of the portion other than the end in the deformation control member forming member, the reinforcement A portion with a large fiber volume ratio becomes a shear deformation promoting layer, and a portion with a small reinforcing fiber volume ratio becomes a deformation control unit. Thus, when the volume fraction of reinforcing fibers in the shear deformation promoting layer is large, the metal (aluminum alloy) content is small at the boundary between the inclined surface and the deformed portion (shear deformation promoting layer). Since it is arranged so as to extend substantially along the inclined surface, the joint strength between the deformation part and the deformation control part against the shearing force is lowered by interposing the shear deformation promoting layer, and as a result, the boundary side of the deformation part The end portion is easily sheared with respect to the inclined surface.

  In the invention of claim 5, in the invention of claim 1 or 2, the deformation part is made of an aluminum alloy casting, the deformation control part is made of a steel member, and the shear deformation promoting layer is made of Al-Fe metal. It shall consist of compounds.

  In other words, since the Al—Fe intermetallic compound is low in strength and brittle, the boundary side end of the deformed portion is sheared with respect to the inclined surface by a shearing force that is generated when a predetermined or more compressive load is input to the main body. It becomes easy to deform. In addition, with the deformation control part forming member (made of steel) set in the cavity of the mold, the molten metal (aluminum alloy) of the deformation part is supplied into the cavity, so that the deformation part and the deformation are deformed. If the control part is integrally formed and then heat treatment is appropriately performed, a shear deformation promoting layer made of an Al—Fe intermetallic compound can be easily formed at the boundary between the inclined surface and the deformation part.

  In the invention of claim 6, in the invention of claim 4 or 5, the aluminum alloy casting is an Al-Mn-Fe-Mg alloy casting.

  That is, the Al-Mn-Fe-Mg-based alloy can improve both castability and elongation at the same time while maintaining the strength of the aluminum alloy by appropriately setting the content of each component. It can be of high ductility with high elongation. Therefore, it is possible to improve the absorption performance of the compressive load while reducing the weight of the impact energy absorbing member.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the impact energy absorbing member is used for a front side frame or a crash can of a vehicle.

  This makes it possible to reliably absorb impact energy at the time of a frontal collision or a rearward collision of the vehicle and improve the safety of the vehicle. Moreover, the deformation | transformation part is comprised, for example by aluminum alloy casting, and improvement in safety can be aimed at, aiming at weight reduction of a vehicle.

  The invention of claim 8 is an invention of a manufacturing method of an impact energy absorbing member which has a cylindrical main body portion and absorbs a compressive load input to the main body portion in the cylinder axial direction. The main body is made of metal and receives a compressive load equal to or greater than a predetermined value, and is subjected to a compressive plastic deformation in the cylinder axial direction of the main body, and a plurality of deformation control units that control the direction of plastic deformation of the deformable portion. The surfaces of the respective deformation control units that are in contact with the deformation portion are inclined in one direction or the other side in the main body portion cylinder axis direction toward the outer side in the main body portion radial direction. Any two inclined surfaces that are adjacent to each other in the body axis direction of the main body portion when the compressive load of the predetermined value or more is input to the main body portion, At the same time as the plastic deformation of When the compressive load greater than the predetermined value is input to the main body at the boundary between the inclined surfaces and the deformed portion, the main body is inclined toward opposite sides toward the outer side in the main body radial direction. A shear deformation promoting layer for promoting shear deformation with respect to the inclined surface at the boundary side end of the deforming portion is formed, and a plurality of deformation control portion forming members for forming the plurality of deformation control portions respectively. The deformed portion and the deformation control portion are integrally formed by supplying the molten metal into the cavity in a state where the produced deformation control portion forming member is set in the cavity of the mold. In the step of producing the deformation control part forming member, the end corresponding to at least the inclined surface of the deformation control part forming member is subjected to the shearing process in the integral forming step of the deformation part and the deformation control part. Material shape promoting layer is formed, or, to be composed of a material the shear deformation promoting layer is formed by performing heat treatment to that said integrally molded after the integral molding step.

  According to the present invention, the deformation portion and the deformation control portion can be easily integrally formed, and the shear deformation promoting layer can be easily formed at the time of the integral formation or at the time of the subsequent heat treatment. Therefore, it is possible to easily manufacture an impact energy absorbing member that can be stably deformed in the main body cylinder axis direction and has excellent handleability.

  In the invention of claim 9, in the invention of claim 8, in the step of producing the deformation control portion forming member, the end corresponding to the inclined surface in the deformation control portion forming member is plated with a melting point lower than that of the metal. It shall consist of materials.

  As a result, at the time of integral molding of the deformable portion and the deformation control portion, a shear deformation promoting layer made of an alloy with the metal of the deformed portion and having a lower melting point than the metal at the boundary between the inclined surface and the deformable portion The impact energy absorbing member according to claim 3 can be easily manufactured.

  In the invention of claim 10, in the invention of claim 8, the metal is an aluminum alloy, the deformation control portion forming member is formed of a reinforcing fiber molded body, and the integral forming step of the deformation portion and the deformation control portion. Is a step of combining the molten metal and the reinforcing fiber molded body, and in the step of forming the deformation control portion forming member, the reinforcing fiber volume ratio of the end corresponding to the inclined surface in the deformation control portion forming member Is made larger than the reinforcing fiber volume ratio of the portion other than the end portion of the deformation control portion forming member.

  This makes it possible to easily form a shear deformation promoting layer having a reinforcing fiber volume ratio larger than that of the deformation control portion at the boundary between the inclined surface and the deformation portion when integrally forming the deformation portion and the deformation control portion, The impact energy absorbing member according to claim 4 can be easily manufactured.

  In the invention of claim 11, in the invention of claim 8, the metal is an aluminum alloy, the deformation control portion forming member is made of steel, and after the integral forming step of the deformation portion and the deformation control portion, By heat-treating the integrally formed one, a shear deformation promoting layer made of an Al—Fe intermetallic compound is formed.

  As a result, a shear deformation promoting layer made of an Al-Fe intermetallic compound can be easily formed at the boundary between the inclined surface and the deformed portion by appropriately performing heat treatment after the integral forming process of the deformed portion and the deformation control unit. The impact energy absorbing member according to claim 5 can be easily manufactured.

  As described above, according to the impact energy absorbing member of the present invention, the main body portion is integrally formed with at least one deformation portion and a plurality of deformation control portions stacked alternately in the main body cylinder axis direction. The surface of each deformation control unit that is in contact with the deformation portion is an inclined surface that is inclined toward one side or the other side in the main body portion cylindrical axis direction toward the outer side in the main body portion radial direction, and is adjacent to the main body portion cylinder axis direction. When two or more inclined surfaces receive a compressive load greater than or equal to a predetermined amount in the cylinder axis direction with respect to the main body part, the deformed part is simultaneously compressed and plastically deformed in the main body cylinder axis direction. So as to be plastically deformed outward or inward in the direction, and inclined in the opposite directions toward the outer side in the radial direction of the main body, and at the boundary between each inclined surface and the deformed portion, the main body is compressed above the predetermined amount. Is input, the inclined surface of the boundary side end of the deformed portion By adopting a configuration in which a shear deformation promoting layer that promotes shear deformation is formed, the main body portion can be stably deformed in the cylinder axis direction, and the compression load absorption performance can be enhanced, and impact can be achieved. The handling property when the energy absorbing member is transported or assembled to a vehicle or the like can be improved.

  In addition, according to the manufacturing method of the impact energy absorbing member of the present invention, the step of producing the deformation control part forming member for forming the deformation control part, and the produced deformation control part forming member are set in the cavity of the mold. In this state, by supplying a molten metal into the cavity, the step of integrally forming the deformation portion and the deformation control portion, in the step of forming the deformation control portion forming member, in the deformation control portion forming member At least the end corresponding to the inclined surface is formed on the material on which the shear deformation promoting layer is formed during the integral molding process of the deformable portion and the deformation control unit, or on the main body formed by the integral molding after the integral molding step. By forming the shear deformation promoting layer with a material that is formed by heat treatment, the main body can be stably deformed in the cylinder axis direction without buckling deformation and Excellent impact energy absorbing member in handling property can be easily produced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 shows an impact energy absorbing member 1 according to Embodiment 1 of the present invention, and this impact energy absorbing member 1 has a cylindrical (cylindrical in this embodiment) body portion 2, and the body It absorbs a compressive load input to the portion 2 in the cylinder axis Z direction (vertical direction in FIG. 1).

  In the present embodiment, the impact energy absorbing member 1 includes front ends of left and right front side frames 91 provided to extend in the front-rear direction at both vehicle width direction positions in the front portion of the vehicle 100, as shown in FIG. The front bumper 93 is used as a crash can 92 interposed between left and right ends of a bumper reinforcement 93a extending in the vehicle width direction. In this case, the impact energy absorbing member 1 is disposed such that the direction of the cylinder axis Z coincides with the front-rear direction of the vehicle 100, and the collision energy (impact compression) input from the bumper reinforcement 93a at the time of a frontal collision of the vehicle 100. Absorbs load).

  The impact energy absorbing member 1 is not limited to the crash can 92 but extends in the front-rear direction at a part (particularly the front end portion) of the left and right front side frames 91 and at both sides in the vehicle width direction at the rear portion of the vehicle 100. A part of the left and right rear side frames (not shown) (particularly the rear end part) provided between the rear side frame and a bumper reinforcement (not shown) of the rear bumper 94. You may use for the crush can (not shown) provided. Further, the impact energy absorbing member 1 can be widely used in a portion where the impact energy needs to be absorbed in the vehicle 100 and can also be used for other than the vehicle 100.

  First and second fixing portions 7 for attaching and fixing the impact energy absorbing member 1 to the front end of the front side frame 91 and the bumper reinforcement 93a, respectively, at both ends of the main body portion 2 in the cylinder axis Z direction. , 8 are provided. The first fixing portion 7 has a plurality of bolt insertion holes 7a through which bolts for fastening and fixing the first fixing portion 7 to the front end of the front side frame 91 are formed. Are formed with a plurality of bolt insertion holes 8a through which bolts for fastening and fixing the second fixing portion 8 to the bumper reinforcement 93a are inserted. The shapes of the first and second fixing portions 7 and 8 differ depending on the application location of the impact energy absorbing member 1.

  When the impact energy absorbing member 1 is used for the crash can 92 as in this embodiment, the outer diameter D of the main body 2 is preferably 40 to 100 mm, the wall thickness t is preferably 2 to 8 mm, and the length L is 80 to 150 mm. Is preferred. In FIG. 1, the outer diameter D of the main body is constant throughout the cylinder axis Z direction of the main body 2, but is not strictly constant and is directed toward the second fixing portion 8. Gradually getting smaller. This is for facilitating mold release from the casting mold 30 after the impact energy absorbing member 1 is cast with a casting mold 30 (see FIG. 8) described later.

  The main body 2 receives a plurality of (four in the present embodiment) annular deformation portions 3 that compressively plastically deform in the cylinder axis Z direction under a predetermined or greater compressive load in the cylinder axis Z direction with respect to the main body 2; A plurality (five in this embodiment) of annular deformation control sections 4 for controlling the direction of plastic deformation of the deformation section 3 are integrally molded in a state where they are alternately stacked in the cylinder axis Z direction. The deformation control unit 4 is made of a material that is less likely to be plastically plastically deformed and less likely to break than the deformation unit 3 with respect to the compressive load in the cylinder axis Z direction, that is, a material that has higher strength and rigidity with respect to the compression load than the deformation unit 3. However, the present invention is not limited to this. Specific materials used in this embodiment will be described later.

  The deformation control unit 4 moves the deformation unit 3 inwardly in the radial direction of the main body 2 simultaneously with the compressive plastic deformation in the cylinder axis Z direction when a compression load greater than or equal to the predetermined value is input to the main body 2. It is designed to force plastic deformation (reduction in diameter).

  Specifically, the surface in contact with the deformation portion 3 of each deformation control portion 4 is an inclined surface 4 a that is inclined toward one side or the other side in the cylinder axis Z direction toward the radially outer side of the main body portion 2. And two arbitrary inclined surfaces 4a adjacent in the cylinder axis Z direction are inclined to opposite sides toward the outer side in the main body portion 2 radial direction. In the present embodiment, each inclined surface 4a is configured such that when a predetermined compressive load or more in the cylinder axis Z direction is input to the main body 2, the entire deformed portion 3 is compressed and plastically deformed in the cylinder axis Z direction. At the same time, the main body portion 2 is inclined so as to be plastically deformed inward in the radial direction. That is, the length of each deformation control unit 4 in the cylinder axis Z direction increases toward the outer side in the radial direction of the main body 2, while the length of each deformation unit 3 in the cylinder axis Z direction increases. It becomes smaller toward the outside in the radial direction.

  Each inclined surface 4a is configured such that when a predetermined or more compressive load is input to the main body portion 2 in the cylinder axis Z direction, the main body portion simultaneously moves the entire deformation portion 3 to compressive plastic deformation in the cylinder axis Z direction. You may incline so that it may carry out plastic deformation (diameter expansion deformation) to the outer side of a two radial direction. That is, the length of each deformation control unit 4 in the cylinder axis Z direction is reduced toward the outer side in the main body part 2 radial direction, while the length of each deformation part 3 in the cylinder axis Z direction is reduced in the main body part 2 radial direction. Increase toward the outside. However, since the deformation resistance when the deformable portion 3 is plastically deformed inward in the main body portion 2 radial direction is larger than the deformation resistance when plastically deformed outward, from the viewpoint of increasing the absorption amount of the compressive load, It is preferable to plastically deform the deformable portion 3 inward in the radial direction of the main body portion 2.

  The inclination angle θ of each of the inclined surfaces 4a (inclination angle with respect to a surface perpendicular to the cylinder axis Z direction) is preferably 30 ° to 60 °, and particularly preferably 40 ° to 50 °. It is preferable that the inclination angle of the inclined surface 4a inclined to the one side in the cylinder axis Z direction and the inclination angle of the inclined surface 4a inclined to the other side are the same. May be different.

  In the present embodiment, both end portions in the cylinder axis Z direction of the main body portion 2 are each configured by the deformation control unit 4, but each may be configured by the deformation unit 3, and either one of the both side end portions. Only the end portion may be configured by the deformation control unit 4. Further, the number of the deforming portions 3 may be one, and in this case, both end portions in the cylinder axis Z direction of the main body portion 2 are respectively configured by the deformation control portion 4.

  It is preferable that the shapes and sizes of the plurality of deformation portions 3 are substantially the same. This is to prevent the compression load from acting uniformly on all the deforming portions 3 and concentrating on the specific deforming portion 3.

  When a predetermined compressive load or more is input to the boundary between each inclined surface 4a and the deforming portion 3 with respect to the main body portion 2 in the cylinder axis Z direction, A shear deformation promoting layer 9 that promotes shear deformation on the inclined surface 4a is formed. That is, when a compressive load of a predetermined value or more is input to the main body 2, the boundary side end of the deformed portion 3 is formed at or near the boundary between the inclined surface 4 a and the deformed portion 3 by the inclination of the inclined surface 4 a. A shearing force that shifts inward in the radial direction of the main body portion 2 acts along the inclined surface 4a, so that the boundary portion of the deformation portion 3 is easily shear-deformed with respect to the inclined surface 4a. If made of a material, the boundary side end of the deformable portion 3 is shear-deformed with respect to the inclined surface 4a by the shearing force, and the deformable portion 3 is easily plastically deformed inward in the main body portion 2 radial direction. Become.

  In this embodiment, the said deformation | transformation part 3 consists of aluminum alloy castings, and the said deformation | transformation control part 4 and the shear deformation promotion layer 9 consist of aluminum alloy castings containing the reinforced fiber. The deformation part 3 and the deformation control part 4 and the shear deformation promoting layer 9 are integrally formed by combining a molten aluminum alloy and a preformed body 15 (see FIG. 5) made of a reinforcing fiber molded body as will be described later. It is.

  The aluminum alloy is preferably an Al—Mn—Fe—Mg alloy. This Al-Mn-Fe-Mg-based alloy is high in casting as it can improve the castability and elongation at the same time while maintaining the strength of the aluminum alloy by appropriately setting the content of each component. It can be of high ductility with elongation. Specifically, 0.5 to 2.5% Mn component, 0.1 to 1.5% Fe component, 0.01 to 1.2% Mg component, and the balance contains inevitable impurities The aluminum alloy is composed of an Al component (the numerical value of the content is a mass percentage).

  In addition, to the Al-Mn-Fe-Mg based alloy having the above respective component contents, 0.1 to 0.2% Ti component by mass percentage, 0.01 to 0.1% B component by mass percentage, And it is more preferable to add at least one of Be components of 0.01 to 0.2% by mass percentage. That is, the Ti component, the B component and the Be component can improve the casting cracking property by refining the crystal grains of the casting, but if the content is too large, a coarse compound is generated. As a result, the elongation decreases. Then, each content of Ti component, B component, and Be component is set to the said range, and cast cracking property is made further favorable, preventing the fall of elongation.

  In place of the Al—Mn—Fe—Mg alloy, for example, an Al—Si alloy may be used (in the case of this alloy, casting is performed by a high vacuum die casting method). The metal may be used.

  As the reinforcing fiber, alumina fiber, silica fiber, silicon carbide fiber and the like are preferable. In the case of alumina fibers and silica fibers, for example, those having an average fiber diameter of 3 μm to 5 μm and a fiber length of 5 mm to 10 mm are used. In the case of silicon carbide fibers, for example, the average fiber diameter of 10 μm to 15 μm, the fiber length is used. The thing of 5 mm-10 mm should just be used.

  The volume ratio of reinforcing fibers of the deformation control unit 4 is preferably 5 to 10%. On the other hand, the reinforcing fiber volume ratio of the shear deformation promoting layer 9 is larger than the reinforcing fiber volume ratio of the deformation control unit 4. Further, the reinforcing fibers of the shear deformation promoting layer 9 are disposed so as to extend substantially along the inclined surface 4a from the manufacturing method described later, and in combination with the large reinforcing fiber volume ratio, the shear deformation promoting layer. 9, the bonding strength between the deformation part 3 and the deformation control part 4 against the shearing force is reduced, and as a result, the boundary side end of the deformation part 3 is in the radial direction of the main body part 2 with respect to the inclined surface 4a. It becomes easy to shear and deform inside. In order to promote the shear deformation, a preferable range of the reinforcing fiber volume ratio of the shear deformation promoting layer 9 is 20 to 25%. This is because, if it is less than 20%, the shear deformation cannot be sufficiently promoted, whereas if it exceeds 25%, the pores in the preform 15 are reduced and the filling property of the molten metal is deteriorated.

  The deformation control unit 4 is reinforced by the combination of an aluminum alloy that is a constituent material of the deformation unit 3 and a reinforcing fiber, and is less likely to undergo plastic plastic deformation than the deformation unit 3 with respect to a compressive load in the cylinder axis Z direction. As a result, when a compressive load greater than or equal to a predetermined value in the cylinder axis Z direction is input to the main body 2 (however, a compressive load that does not cause the plastic deformation of the deformation control unit 4) is input. As shown in FIG. 3, in a state where the deformation control unit 4 is not compressed and plastically deformed (but elastically deformed), the deformed unit 3 is compressed and plastically deformed in the cylinder axis Z direction. Further, due to the inclined surface 4 a of the deformation control unit 4, the deformation unit 3 is plastically deformed inward in the main body 2 radial direction simultaneously with the compressive plastic deformation in the cylinder axis Z direction. In addition, since the shear deformation promoting layer 9 is formed at the boundary between the inclined surface 4a and the deforming portion 3, the shear deforming promoting layer 9 causes the deforming portion 3 to be further plastically deformed inward of the main body portion 2 in the radial direction. It becomes easy to do. The compression load is absorbed by the plastic deformation of the deformable portion 3. At this time, the deforming portion 3 spreads inward in the radial direction of the main body portion 2 while its length in the cylindrical axis Z direction is shortened, so that the main body portion 2 as a whole is stable in the cylindrical axis Z direction without causing buckling deformation. And deform. The deformable portion 3 is slightly plastically deformed outward in the radial direction of the main body 2 along with the compressive plastic deformation in the cylinder axis Z direction, but the amount of plastic deformation to the outside is forcibly deformed. It is considerably smaller than the amount of plastic deformation inward.

  In addition, when a compression load having such a magnitude that the deformation control unit 4 is compressively plastically deformed in the cylinder axis Z direction with respect to the main body 2, the deformation control unit 4 is also connected to the cylinder axis as shown in FIG. 4. Compressive plastic deformation in the Z direction. Furthermore, the deformation control unit 4 is plastically deformed outward in the radial direction of the main body 2 by the reaction force received by the inclined surface 4a from the deformation unit 3. Even during the plastic deformation of the deformation control unit 4, the deformation control unit 4 moves the main body unit simultaneously with the compressive plastic deformation in the cylinder axis Z direction until the inclination angle θ of the inclined surface 4a becomes zero. It plays the role of plastic deformation inward in the two radial directions. Even if the inclination angle θ of the inclined surface 4a becomes 0 due to plastic deformation of the deformation control unit 4, the plastic deformation amount of the deformation unit 3 is already considerably large at that time, and as a result, after that time, Even if the compressive load continues to act, the main body 2 as a whole is deformed in the direction of the cylinder axis Z without causing buckling deformation.

  In addition, there is a possibility of fracture (shear fracture) at the interface between the shear deformation promoting layer 9 and the deformed portion 3 (or the inclined surface 4a) at the time of inputting the compression load greater than the predetermined value to the main body portion 2, Even if it breaks, the deformed portion 3 is still plastically deformed inward in the main body portion 2 radial direction by the inclined surface 4a. Rather, it becomes easy to plastically deform inward in the main body portion 2 radial direction by the fracture. .

  In order to manufacture the impact energy absorbing member 1, first, as shown in FIG. 5, a plurality of preforms capable of forming the plurality of deformation control portions 4 by combining with the molten aluminum alloy, respectively. A body 15 (corresponding to a plurality of deformation control unit forming members for forming the plurality of deformation control units 4) is formed. The end 15a corresponding to the inclined surface 4a in each preform 15 is made of a material on which the shear deformation promoting layer 9 is formed during integral molding described later. That is, the entire preform 15 including the end 15a is made of a reinforcing fiber molded body, and the reinforcing fiber volume ratio of the end 15a is the reinforcing fiber volume ratio of the portion 15b of the preform 15 other than the end 15a. Is bigger than. A portion of the preform 15 where no reinforcing fiber is present is a hole. In addition, the preform 15 shown in FIG. 5 is for forming three deformation control units 4 other than the two deformation control units 4 located at both ends of the main body unit 2 in the cylinder axis Z direction. In the two deformation control units 4 positioned at both end portions in the cylinder axis Z direction in the main body unit 2, there is only one end portion 15a in which the reinforcing fiber volume ratio is increased.

  Each preform 15 is produced as follows. That is, first, the reinforcing fiber, water, and additives are put in a container (not shown), and the mixture is stirred and mixed to prepare a slurry 24 (see FIG. 6). The additive includes a reinforcing agent (for example, granular alumina sol) for securing the strength of the preform 15, an adhesion promoter (for example, ammonium sulfate) for promoting adhesion of the reinforcing agent to the reinforcing fibers, and a reinforcing material. It is a dispersing agent (for example, polyamide) for improving the dispersibility of the fiber.

  Subsequently, as shown in FIG. 6, liquid components such as water in the slurry 24 are removed by the filtration device 20. The filtration device 20 includes a container 21 in which a porous filter 22 is disposed, and a suction device (not shown) connected to the bottom of the container 21. A protrusion 22 a (not functioning as a filter) protruding upward is formed at the center of the porous filter 22, and a peripheral portion (functioning as a filter) of the protrusion 22 a is formed by the deformation control unit 4. It inclines with respect to the horizontal to correspond to the inclined surface 4a. Then, the slurry 24 is introduced into the container 21 above the peripheral portion of the protrusion 22a of the porous filter 22, and then the liquid such as water in the slurry 24 is passed through the porous filter 22 by the suction device. Remove components (suction dehydration).

  Next, as shown in FIG. 7, the first liquid removal member 25 obtained by removing the liquid component in the slurry 24 is compressed. That is, the first liquid removal member 25 is pressurized from above by the punch 27 while the first liquid removal member 25 is disposed in the container 21 above the peripheral portion of the protrusion 22a of the porous filter 22. Compression molding is performed so that the shape of the portion 15b of the preform 15 is obtained. A fitting hole 27 a into which the protrusion 22 a is fitted is formed at the center of the lower surface of the punch 27, and the peripheral portion of the fitting hole 27 a is horizontal to correspond to the inclined surface 4 a of the deformation control unit 4. It is inclined with respect to. In addition, when forming the preform 15 for forming the deformation control unit 4 disposed at both side ends in the cylinder axis Z direction in the main body 2, the shape is extended horizontally without inclining the lower surface of the punch 27. To do.

  Similarly, an umbrella-shaped second liquid removal member that has the shape of each end 15a of the preform 15 is compression-molded. Since the thickness of the second liquid removal member after compression molding is small, the reinforcing fibers are disposed so as to extend substantially along the end surface in the thickness direction of the second liquid removal member.

  Next, after the compression-molded first liquid removal member 25 and the second liquid removal member are dried, the second liquid removal member is placed on both sides or one side of the first liquid removal member 25. Stack and sinter. This sintering is performed at 640-840 degreeC for 1.5 hours, for example. In this way, the preform 15 made of the reinforcing fiber molded body is completed.

  Next, the impact energy absorbing member 1 is manufactured (cast) using a casting mold 30 as shown in FIG. The casting mold 30 is attached to a fixed mold 32 attached and fixed to a fixed mold plate 31 and a movable mold plate 33 supported so as to be movable in the left-right direction in FIG. A fixed movable mold 34 is provided. The fixed mold 32 is formed with a recessed portion 32a that opens to the movable mold 34 side, while the movable mold 34 is formed with a projecting portion 34a that enters the recessed portion 32a, and these recessed portions 32a. And a cavity 35 is formed between the protrusions 34a. A plurality of grooves (not shown) for supporting the plurality of preforms 15 are formed on the outer peripheral surface of the protrusion 34a. Further, the fixed mold 32 is provided with a plurality of pins 32 b for forming a plurality of bolt insertion holes 8 a of the second fixed portion 8. The movable mold 34 has the first fixed portion 7. A plurality of pins 34b for forming a plurality of bolt insertion holes 7a are provided.

  The casting mold 30 is provided with an injection sleeve 37 for supplying a molten aluminum alloy into the cavity 35. The injection sleeve 37 is formed with a hot water supply port 37a for the molten metal. In addition, an injection plunger 38 slidably fitted to the injection sleeve 37 is provided in the injection sleeve 37. By moving the injection plunger 38 to the left side in FIG. 8, a hot water supply port 37a is provided. The molten metal supplied into the injection sleeve 37 is injected into the cavity 35.

  In order to manufacture the impact energy absorbing member 1 using the casting mold 30, first, in the mold open state, the plurality of preformed moldings are formed in the plurality of grooves formed in the protrusions 34 a of the movable mold 34. Each of the bodies 15 is supported, and then the movable mold 34 is moved to the fixed mold 32 side to close the mold. As a result, the plurality of preforms 15 are set in the cavity 15 of the casting mold 30.

  Subsequently, a molten aluminum alloy (a molten metal temperature of about 700 ° C.) is supplied into the injection sleeve 37 from the hot water supply port 37 a, and this molten metal is injected into the cavity 35 by the injection plunger 38 and supplied. As a result, the deformed portion 3 and the first and second fixing portions 7 and 8 are formed in the portion in the cavity 35 where the preform 15 does not exist, and the holes in each preform 15 are filled with molten metal. Thus, the preform 15 and the molten metal are combined, whereby the deformation control unit 4 is integrally formed with the deformation unit 3 and the first and second fixing units 7 and 8. At the time of this integral molding, the end portion 15 a of the preform 15 becomes the shear deformation promoting layer 9, and the other portion 15 b becomes the deformation control unit 4. Thus, the shear deformation promoting layer 9 is also integrally formed with the deformation portion 3 and the deformation control portion 4. When the molten metal in the cavity 15 is solidified, the casting of the impact energy absorbing member 1 is completed.

  Therefore, in the present embodiment, the main body 2 of the impact energy absorbing member 1 is integrally formed in a state where the deformable portions 3 and the deformation control portions 4 are alternately stacked in the cylinder axis Z direction. The surface in contact with the deformable portion 3 of 4 is an inclined surface 4a that is inclined toward one side or the other side in the cylinder axis Z direction toward the outside in the radial direction of the main body portion 2 and any two adjacent to the cylinder axis Z direction. When the inclined surface 4a receives a compressive load greater than or equal to a predetermined value in the cylinder axis Z direction with respect to the main body 2, the deformed portion 3 is moved in the radial direction of the main body 2 simultaneously with the compressive plastic deformation in the cylinder axis Z direction. Inclined in opposite directions toward the outer side in the radial direction of the main body 2 so as to be plastically deformed inward, and at the boundary between each inclined surface 4a and the deformable portion 3 in the cylinder axis Z direction with respect to the main body 2 When a compressive load of a predetermined value or more is input, the boundary side end of the deformable portion 3 is against the inclined surface 4a. By adopting a configuration in which the shear deformation promoting layer 9 that promotes shear deformation is formed, the deformed portion 3 spreads inwardly in the radial direction of the main body portion 2 while its length in the cylinder axis Z direction is shortened. Thus, the main body 2 as a whole is stably deformed in the cylinder axis Z direction without causing buckling deformation. In addition, since the shear deformation promoting layer 9 is formed at the boundary between the inclined surface 4a and the deforming portion 3, the shear deforming promoting layer 9 causes the deforming portion 3 to be further plastically deformed inward of the main body portion 2 in the radial direction. It becomes easy to do. As a result, even if a force is applied to the main body 2 simultaneously with the compressive load in the cylinder axis Z direction and the main body 2 is tilted in the radial direction, the main body 2 is hardly buckled and deformed. It is possible to reliably deform in the Z direction, thereby improving the compression load absorption performance. Further, since the deformation resistance when the deformable portion 3 plastically deforms inward in the radial direction of the main body portion 2 is larger than the deformation resistance when plastically deforms outward, it is possible to further increase the amount of compression load absorbed. it can. Furthermore, even if the number of the deformation parts 3 and the deformation control parts 4 increases, the deformation parts 3 and the deformation control parts 4 can be firmly and easily fixed to each other by integral molding, and the impact energy absorbing member 1 can be transported. It is possible to improve handling at the time of installation to a vehicle or a vehicle.

(Embodiment 2)
In the present embodiment, the materials of the deformation control unit 4 and the shear deformation promoting layer 9 are different from those of the first embodiment.

  In other words, in the present embodiment, the deformation control unit 4 is made of a metal member (in this embodiment, a steel member) that is more difficult to be plastically deformed and broken than an aluminum alloy casting against a compressive load in the cylinder axis Z direction. . Further, the shear deformation promoting layer 9 is an alloy with a metal (aluminum alloy) of the deformed portion 3 and is made of an alloy having a melting point lower than that of the metal (in this embodiment, a Zn-Al alloy). Since the shear deformation promoting layer 9 made of this Zn—Al-based alloy has low strength, the boundary side end of the deformed portion 3 is caused by the shear force generated when a predetermined or higher compressive load is input to the main body portion 2. It becomes easy to carry out a shear deformation | transformation inside the main-body part 2 radial direction with respect to the inclined surface 4a. As a result, the deformable portion 3 is more easily plastically deformed inward of the main body portion 2 in the radial direction.

  In order to manufacture the impact energy absorbing member 1 of the present embodiment, first, a plurality of deformation control unit forming members for forming the plurality of deformation control units 4 are prepared. Specifically, the steel member is processed and finished to have the same shape as the deformation control unit 4. And in order to comprise the edge part corresponding to the said inclined surface 4a in this steel member (deformation control part formation member) with the plating material of melting | fusing point lower than the metal of the deformation part 3, in the said steel member at least to a cylinder axis Z direction Apply galvanization to both sides in the corresponding direction. Note that instead of zinc plating, zinc alloy plating (for example, Zn—Al, Zn—Al—Mg, Sn—Zn) may be performed.

  Subsequently, a plurality of through-holes penetrating in the direction corresponding to the cylinder axis Z direction are formed in the galvanized steel member. Thus, the deformation control unit forming member is completed. In addition, you may make it form a through-hole previously and galvanize after that.

  The through holes are provided to allow the molten metal to flow in the direction of the cylinder axis Z in the cavity 15 and to reliably integrate the deformable portion 3 and the deformation control portion 4, but the number thereof is too large. Then, since the shear deformation promoting function by the shear deformation promoting layer 9 is lowered, the number of through holes is set in consideration of these matters.

  Note that the through hole is not necessarily formed. When the through hole is not formed, a flow groove through which the molten metal flows may be formed in the fixed mold 32 so that the molten metal flows in the direction of the cylinder axis Z in the cavity 15. What is necessary is just to remove the protrusion part shape | molded corresponding to this distribution | circulation groove | channel after casting.

  In the state where the produced deformation control part forming member is set in the cavity 15 of the casting mold 30 as in the preform 15 of the first embodiment, the molten aluminum alloy is supplied into the cavity 30. Thus, the deformation part 3, the deformation control part 4 (deformation control part forming member), and the first and second fixing parts 7 and 8 are integrally formed. At this time, since the through hole is formed in the deformation control unit forming member, the molten metal flows in the direction of the cylinder axis Z through the through hole in the cavity 15, and the deformation unit 3 and the deformation control unit 4 are formed by the through hole. It is surely integrated.

  In addition, during the integral molding, the plated zinc is melted by the molten metal, whereby the shear deformation promoting layer 9 made of a Zn—Al alloy having a lower melting point than the aluminum alloy is formed at the boundary between the inclined surface 4 a and the deformed portion 3. Will be formed.

  Therefore, also in the present embodiment, the same effects as those of the first embodiment can be obtained, and when a predetermined or more compressive load is input to the main body 2 in the direction of the cylinder axis Z, the main body 2 is connected to the cylinder shaft. It is possible to reliably deform in the Z direction and enhance the compressive load absorption performance.

(Embodiment 3)
In the present embodiment, the materials of the deformation control unit 4 and the shear deformation promoting layer 9 are different from those of the first and second embodiments.

  That is, in this embodiment, the steel member of the said Embodiment 2 is used as a deformation | transformation control part formation member as it is, without giving plating. However, a through hole similar to that of the second embodiment is provided (as described in the second embodiment, when a flow groove through which the molten metal flows is formed in the fixed mold 32, the through hole does not have to be formed. ).

  In the same manner as in the second embodiment, the deformation control unit forming member is set in the cavity 15 of the casting mold 30, and the molten aluminum alloy is supplied into the cavity 30. The control unit 4 (deformation control unit forming member) and the first and second fixing units 7 and 8 are integrally formed.

  After solidification of the molten metal, the integrally formed material is subjected to heat treatment to form a shear deformation promoting layer 9 made of an Al—Fe intermetallic compound. That is, for example, by performing heat treatment at 400 ° C. for about 1 hour, an Al—Fe intermetallic compound is formed at the boundary between the deformable portion 3 (aluminum alloy) and the deformation control portion 4 (steel). Since the shear deformation promoting layer 9 made of the Al—Fe intermetallic compound has low strength and is brittle, the boundary side end of the deformed portion 3 is generated by a shearing force generated when a predetermined compressive load or more is input to the main body portion 2. The portion is easily sheared and deformed inward in the radial direction of the main body portion 2 with respect to the inclined surface 4a.

  Therefore, also in the present embodiment, the same effects as those of the first and second embodiments can be obtained, and when a predetermined compressive load or more is input to the main body 2 in the cylinder axis Z direction, the main body 2 is It can be reliably deformed in the direction of the cylinder axis Z, and the absorption performance of the compression load can be enhanced.

  INDUSTRIAL APPLICABILITY The present invention is useful for an impact energy absorbing member that absorbs a compressive load that is input to a cylindrical main body in the cylinder axis direction, and a method for manufacturing the same. This is useful when applied to left and right front side frames and left and right rear side frames.

It is sectional drawing which shows the impact energy absorption member which concerns on Embodiment 1 of this invention. It is the side view which fractured | ruptured the front part of the vehicle which shows the crash can to which an impact energy absorption member is applied. Sectional drawing which shows the deformation | transformation state of this main-body part when the compressive load more than predetermined (the compressive load of the magnitude | size which a deformation | transformation control part does not compress-plastically deform) is input with respect to the main-body part of an impact energy absorption member in a cylinder axis direction. It is. It is sectional drawing which shows a state when the compression load of a magnitude | size which a deformation | transformation control part plastically deforms is input with respect to the main-body part of an impact energy absorption member in a cylinder axial direction. It is sectional drawing which shows a preforming body. It is sectional drawing of the container of the filtration apparatus which shows the state which has removed the liquid component in a slurry. FIG. 7 is a view corresponding to FIG. 6, illustrating a state where a liquid removal member obtained by removing a liquid component in a slurry is compressed. It is sectional drawing which shows a casting mold.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Impact energy absorption member 2 Main part 3 Deformation part 4 Deformation control part 4a Inclined surface 15 Preliminary body (deformation control part formation member)
30 Casting mold 35 Cavity 91 Front side frame 92 Crash can

Claims (11)

An impact energy absorbing member that has a cylindrical main body portion and absorbs a compressive load that is input to the main body portion in the cylinder axis direction,
The main body is made of metal and receives at least a predetermined compressive load and undergoes plastic plastic deformation in the main body cylinder axis direction, and a plurality of deformation controls for controlling the direction of plastic deformation of the deformable part. Parts are integrally molded in a state of being alternately laminated in the main body cylinder axis direction,
The surface in contact with the deformation portion of each deformation control portion is an inclined surface that is inclined toward one side or the other side in the main body cylindrical direction toward the outer side in the main body radial direction.
Arbitrary two inclined surfaces adjacent to the main body portion in the cylinder axis direction, when a compressive load greater than or equal to the predetermined value is input to the main body portion, the deformation portion is compressed and plastically deformed in the main body portion cylinder axis direction. At the same time, so as to be plastically deformed outward or inward in the main body radial direction, inclined toward opposite sides toward the outer side in the main body radial direction,
When a compressive load greater than or equal to the predetermined value is input to the main body at the boundary between each inclined surface and the deformed portion, the boundary side end of the deformed portion promotes shear deformation with respect to the inclined surface. An impact energy absorbing member, wherein a shear deformation promoting layer is formed. The impact energy absorbing member according to claim 1,
Each of the inclined surfaces plastically deforms the deformed portion inwardly in the radial direction of the main body portion simultaneously with the compressive plastic deformation in the main body portion cylindrical axis direction when a compression load greater than or equal to the predetermined value is input to the main body portion. An impact energy absorbing member characterized by being inclined as described above. The impact energy absorbing member according to claim 1 or 2,
The impact energy absorbing member, wherein the shear deformation promoting layer is made of an alloy with the metal and having a melting point lower than that of the metal. The impact energy absorbing member according to claim 1 or 2,
The deformation part is made of an aluminum alloy casting,
The deformation control unit and the shear deformation promoting layer are made of an aluminum alloy casting containing reinforcing fibers,
The impact energy absorbing member, wherein a reinforcing fiber volume ratio of the shear deformation promoting layer is larger than a reinforcing fiber volume ratio of the deformation control unit. The impact energy absorbing member according to claim 1 or 2,
The deformation part is made of an aluminum alloy casting,
The deformation control unit is made of a steel member,
The impact energy absorbing member, wherein the shear deformation promoting layer is made of an Al-Fe intermetallic compound. The impact energy absorbing member according to claim 4 or 5,
The impact energy absorbing member, wherein the aluminum alloy casting is an Al-Mn-Fe-Mg alloy casting. The impact energy absorbing member according to any one of claims 1 to 6,
An impact energy absorbing member used for a front side frame or a crash can of a vehicle. A method for manufacturing an impact energy absorbing member that has a cylindrical main body part and absorbs a compressive load input in the cylinder axis direction with respect to the main body part,
The main body is made of metal and receives a compressive load equal to or greater than a predetermined value, and is subjected to a compressive plastic deformation in the cylinder axial direction of the main body, and a plurality of deformation control units that control the direction of plastic deformation of the deformable portion. , Alternately stacked in the body axis direction
The surface in contact with the deformation portion of each deformation control portion is an inclined surface that is inclined toward one side or the other side in the main body cylindrical direction toward the outer side in the main body radial direction.
Arbitrary two inclined surfaces adjacent to the main body portion in the cylinder axis direction, when a compressive load greater than or equal to the predetermined value is input to the main body portion, the deformation portion is compressed and plastically deformed in the main body portion cylinder axis direction. At the same time, so as to be plastically deformed outward or inward in the main body radial direction, inclined toward opposite sides toward the outer side in the main body radial direction,
When a compressive load greater than or equal to the predetermined value is input to the main body at the boundary between each inclined surface and the deformed portion, the boundary side end of the deformed portion promotes shear deformation with respect to the inclined surface. A shear deformation promoting layer is formed,
Producing a plurality of deformation control part forming members for forming the plurality of deformation control parts, respectively;
Including the step of integrally forming the deformation part and the deformation control part by supplying the molten metal into the cavity with the produced deformation control part forming member set in the cavity of the mold. ,
In the step of forming the deformation control unit forming member, the shear deformation promoting layer is formed at the end of the deformation control unit forming member corresponding to at least the inclined surface during the integral forming step of the deformation unit and the deformation control unit. Or a material for forming the shear deformation promoting layer by heat-treating the integrally molded material after the integral molding step. In the manufacturing method of the impact energy absorption member according to claim 8,
In the manufacturing process of the deformation control part forming member, an end of the deformation control part forming member corresponding to the inclined surface is made of a plating material having a melting point lower than that of the metal. Production method. In the manufacturing method of the impact energy absorption member according to claim 8,
The metal is an aluminum alloy,
The deformation control unit forming member is composed of a reinforcing fiber molded body,
The integral molding step of the deformation portion and the deformation control portion is a step of combining the molten metal and the reinforcing fiber molded body,
In the deformation control part forming member manufacturing step, the reinforcing fiber volume fraction of the end corresponding to the inclined surface in the deformation control part forming member is defined as the reinforcing fiber volume of the part other than the end in the deformation control part forming member. The manufacturing method of the impact energy absorption member characterized by making it larger than a rate. In the manufacturing method of the impact energy absorption member according to claim 8,
The metal is an aluminum alloy,
The deformation control part forming member is made of steel,
Impact energy absorption characterized by forming a shear deformation promoting layer made of an Al-Fe intermetallic compound by heat-treating the integrally formed product after the integrally forming step of the deformed portion and the deformation control portion. Manufacturing method of member.

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