JP5071299B2 - Impact energy absorbing member and manufacturing method thereof - Google Patents

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 body portion is made of metal and receives a compressive load of a predetermined level or more, and deforms and compressively plastically deforms in the body portion cylindrical axis direction. A plurality of outer peripheral side deformation control units that are arranged annularly along the direction and control the direction of plastic deformation of the deformation unit, and in the body portion circumferential direction at a plurality of locations in the cylinder axis direction on the inner peripheral portion of the main body unit A plurality of inner peripheral side deformation control units that are arranged in a ring shape and control the direction of plastic deformation of the deformable portion are integrally formed, and the outer peripheral side and the inner peripheral side deformation control portion are the main body portion. Are arranged alternately in the cylinder axis direction of the When a compressive load greater than or equal to the predetermined value is input to the part, the part located on the outer peripheral part of the main body part in the deformed part at the same time as the compressive plastic deformation of the deformed part in the cylinder axial direction is And a portion located in the inner peripheral part of the main body part is plastically deformed inward in the radial direction of the main body part.

  With the above configuration, when a predetermined or greater compressive load is input to the main body in the cylinder axis direction, the deformable portion is compressed by the outer peripheral side and inner peripheral side deformation control units in the main body portion cylindrical axis direction. At the same time as the deformation, plastic deformation is performed outward and inward in the main body radial direction, and the compressive load (impact energy) can be absorbed by the plastic deformation of the deformed portion. In addition, the length of the deforming portion in the main body portion cylindrical axis direction is shortened and spreads in a balanced manner toward the outer side and the inner side in the main body portion radial direction, so that the entire main body portion is not buckled and deformed in the cylindrical axis direction. Deforms stably. In addition, since the deforming part is integrally formed with the outer peripheral side and the inner peripheral side deformation control part, it is difficult to separate from the outer peripheral side and the inner peripheral side deformation control part. It will be deformed stably. 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. Further, even if the number of outer peripheral side and inner peripheral side deformation control units increases, the outer peripheral side and inner peripheral side deformation control units can be firmly and easily fixed to the deformed unit by integral molding, absorbing impact energy. The handling property at the time of carrying the member or assembling the vehicle or the like can be improved. Note that the outer peripheral side and inner peripheral side deformation control units have, for example, a material that is less likely to be plastically plastically deformed and more difficult to break than a deformed portion with respect to a compressive load in the main body cylinder axis direction, that is, strength and rigidity against the compressive load. What is necessary is just to comprise with a material higher than a deformation | transformation part.

  According to a second aspect of the present invention, in the first aspect of the invention, the deformed portion is made of an aluminum alloy casting, and the outer peripheral side and inner peripheral side deformation control portions are made of an aluminum alloy cast containing reinforcing fibers. To do.

  This makes it possible for the outer peripheral side and inner peripheral side deformation control sections to be more difficult to be plastically plastically deformed and to be more difficult to break than the deformed section by the reinforcing fibers, and to reliably control the direction of plastic deformation of the deformed section. Further, the impact energy absorbing member can be reduced in weight. Furthermore, by molding the outer peripheral side and inner peripheral side preforms made of reinforcing fiber moldings, by combining these outer peripheral side and inner peripheral side preforms and molten aluminum alloy, the deformed portion and The outer peripheral side and inner peripheral side deformation control unit can be easily formed integrally.

  In the invention of claim 3, in the invention of claim 2, the reinforcing fibers extend in the radial direction of the main body.

  Thus, when a compressive load having such a magnitude that the outer peripheral side and inner peripheral side deformation control part compressively plastically deforms in the cylinder axis direction with respect to the main body part is input, the outer peripheral side and inner peripheral side deformation control. The portion comes to compressively plastically deform straight in the cylinder axis direction of the main body portion, and the buckling deformation of the main body portion can be more reliably suppressed.

  In the invention of claim 4, in the invention of claim 2 or 3, 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 fifth aspect of the present invention, in any one of the first to fourth 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. Further, by using the deformable portion and the outer peripheral side and inner peripheral side deformation control portions as the material as in the invention of claim 2, it is possible to improve the safety while reducing the weight of the vehicle.

  The invention of claim 6 is an invention of a manufacturing method of an impact energy absorbing member that 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 of a predetermined value or more, and undergoes compression plastic deformation in the main body cylindrical axis direction, and the main body circumferential direction at a plurality of locations in the cylindrical axis direction on the outer peripheral portion of the main body A plurality of outer peripheral side deformation control units that are arranged annularly along the outer peripheral side to control the direction of plastic deformation of the deformation unit, and along the circumferential direction of the main body at a plurality of locations in the cylindrical axis direction at the inner peripheral portion of the main body Each of which is arranged in an annular shape and includes a plurality of inner peripheral side deformation control units that control the direction of plastic deformation of the deformation unit, and the outer peripheral side and the inner peripheral side deformation control unit are arranged in the cylinder axis direction of the main body unit. Alternatingly arranged, the main body part is more than the predetermined above When a compressive load is input, simultaneously with the compressive plastic deformation of the deformable portion in the main body cylinder axis direction, the portion located on the outer peripheral portion of the main body portion in the deformable portion is plastically deformed outward in the main body radial direction and the main body The portion located in the inner peripheral portion is configured to be plastically deformed inward in the radial direction of the main body, and the plurality of outer peripheral side deformation control units and the plurality of inner peripheral side deformation controls are formed by combining with the molten metal. Forming a plurality of outer periphery side preforms and a plurality of inner periphery side preforms capable of forming the respective parts, and setting the molded outer periphery side and inner periphery side preforms in the cavity of the mold In this state, by supplying the molten metal into the cavity, the molten metal, the outer peripheral side and the inner peripheral side preform are combined, and the deformed portion, the outer peripheral side and the inner peripheral side deformation control unit, Including the step of integrally molding And things.

  According to this invention, the outer peripheral side and inner peripheral side preform and the molten aluminum alloy can be combined to easily form the deformed portion and the outer peripheral side and inner peripheral side deformation control portion integrally. It is possible to easily manufacture an impact energy absorbing member that can be stably deformed in the direction of the partial cylinder axis and that is excellent in handleability.

  In the invention of claim 7, in the invention of claim 6, the metal is an aluminum alloy, and the outer peripheral side and inner peripheral side preforms are made of reinforcing fiber moldings.

  Thus, the impact energy absorbing member according to the invention of claim 2 can be easily manufactured.

  As described above, according to the impact energy absorbing member of the present invention, the main body portion is formed by integrally forming the deformation portion, the plurality of outer peripheral side deformation control portions, and the plurality of inner peripheral side deformation control portions. And the inner peripheral side deformation control unit is alternately arranged in the cylinder axis direction of the main body, and when a predetermined or more compressive load is input to the main body in the cylinder axis direction, the main body of the deformation unit At the same time as the compressive plastic deformation in the cylinder axis direction, the part located in the outer peripheral part of the main body part in the deformed part is plastically deformed outward in the radial direction of the main body part and the part located in the inner peripheral part of the main body part in the radial direction of the main body part By adopting a configuration in which the plastic body is deformed plastically, the main body portion can be stably deformed in the cylinder axis direction, the compression load absorption performance can be improved, and the impact energy absorbing member can be transported or applied to a vehicle or the like. Handling during assembly It is possible to improve the.

  In addition, according to the manufacturing method of the impact energy absorbing member of the present invention, a step of forming a plurality of outer peripheral side preforms and a plurality of inner periphery side preforms, and forming the outer periphery side and inner periphery side preforms into gold In the state set in the cavity of the mold, the molten metal is supplied into the cavity, so that the molten metal, the outer peripheral side and the inner peripheral side preform are combined, and the deformed portion, the outer peripheral side and the inner peripheral part are combined. By including the step of integrally forming the side deformation control unit, the impact energy absorbing member that can be stably deformed in the cylinder axis direction without buckling deformation of the main body portion and has excellent handleability. Can be easily manufactured.

  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 portion is shown to be constant throughout the entire cylinder axis Z direction of the main body portion 2, but is not strictly constant and is directed toward the second fixing portion 8 side. Gradually getting smaller. This is for facilitating release from the casting mold 30 after casting the impact energy absorbing member 1 with a casting mold 30 (see FIG. 7) described later.

  The main body 2 is subjected to a compressive plastic deformation in the cylinder axis Z direction upon receiving a predetermined compressive load in the cylinder axis Z direction with respect to the main body 2, and the cylinder axis Z direction in the outer peripheral portion of the main body 2. A plurality of outer peripheral side deformation control units 5 that are arranged annularly along the circumferential direction of the main body 2 at a plurality of locations and control the direction of plastic deformation of the deformation unit 3, and the cylinder axis Z at the inner peripheral part of the main body 2 A plurality of inner circumferential side deformation control units 6 that are arranged annularly along the circumferential direction of the main body 2 and control the direction of plastic deformation of the deformation unit 3 are integrally formed at a plurality of locations in the direction. . The outer peripheral side and inner peripheral side deformation control units 5 and 6 are alternately arranged in the cylindrical axis Z direction of the main body 2, and a predetermined or more compressive load is applied to the main body 2 in the cylindrical axis Z direction. When input, simultaneously with the compressive plastic deformation of the deformable portion 3 in the cylinder axis Z direction, the portion located on the outer peripheral portion of the main body portion 2 in the deformable portion 3 is forcibly plastically deformed outward in the main body portion 2 radial direction. (Diameter expansion deformation) and a portion located in the inner peripheral portion of the main body portion 2 is forcibly plastically deformed (reduction in diameter) inward in the radial direction of the main body portion 2. These outer peripheral side and inner peripheral side deformation control units 5 and 6 are made of a material that is more difficult to be plastically plastically deformed and less likely to be destroyed than the deformable portion 3 with respect to the compressive load in the cylinder axis Z direction, that is, the strength and rigidity against the compressive load. What is necessary is just to comprise with a material higher than the deformation | transformation part 3, but it is not restricted to this.

  In this embodiment, the said deformation | transformation part 3 consists of aluminum alloy castings, and the outer peripheral side and inner peripheral side deformation control parts 5 and 6 consist of aluminum alloy castings in which the reinforced fiber contained. The deformation part 3 and the outer peripheral side and inner peripheral side deformation control parts 5 and 6 are, as will be described later, outer peripheral side and inner peripheral side preforms 15 and 16 made of a molten aluminum alloy and a reinforcing fiber molded body (see FIG. 7). ) And formed integrally.

  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 fiber volume fraction of the reinforcing fiber molded body (preliminary molded body 15) is preferably 5 to 10%, and the portion of the preformed body 15 where the reinforcing fiber is not present is a void.

  Instead of the reinforcing fiber, steel or stainless steel wire having an average diameter of 8 μm to 12 μm and a length of several centimeters may be contained in the aluminum alloy casting. Also in this case, similarly to the reinforcing fiber, a preformed body made of a hardened wire is formed, and the molten aluminum alloy and the preformed body are combined. It is preferable that the wire volume ratio of this preform is 5 to 10%.

  A porous metal body may be used as the preform to be combined with the molten metal. For example, a porous nickel body (trade name: nickel cermet) having a porosity of 98% can be used as a preform. Also, a metal having a plurality of through-holes penetrating in a direction corresponding to the cylinder axis Z direction (a metal (for example, steel) that is less likely to be plastically deformed and more difficult to break than an aluminum alloy casting against a compressive load in the cylinder axis Z direction. )) Can also be used (the through hole is impregnated with molten aluminum alloy).

  The constituent materials of the outer peripheral side and the inner peripheral side deformation control units 5 and 6 are preferably the same, but may be different from each other.

  The reinforcing fibers of the outer peripheral side and inner peripheral side deformation control parts 5, 6 preferably extend in the radial direction of the main body part 2. This is because the outer peripheral side and the inner peripheral side when the outer peripheral side and inner peripheral side deformation control units 5 and 6 are compressed and plastically deformed in the direction of the cylinder axis Z with respect to the main body 2 are input. This is because the peripheral side deformation control units 5 and 6 are subjected to compression plastic deformation straight in the cylinder axis Z direction of the main body 2 to suppress buckling deformation of the main body 2.

  As described above, the outer peripheral side and inner peripheral side deformation control units 5 and 6 are reinforced by the composite of the aluminum alloy that is the constituent material of the deformation unit 3 and the reinforcing fiber, and are deformed against the compressive load in the cylinder axis Z direction. It is more difficult to compress and plastically deform and harder to break than part 3.

  On the other hand, the deforming part 3 is located in a part other than the outer peripheral side and inner peripheral side deformation control parts 5 and 6 in the main body part 2. That is, the deforming portion 3 extends in the main body portion 2 over the entire cylinder axis Z direction, and has a bellows shape due to the above arrangement of the outer peripheral side and inner peripheral side deformation control portions 5 and 6. The part located in the outer peripheral part and the part located in the inner peripheral part of the main body part 2 are alternately arranged in the cylinder axis Z direction. Then, when a compressive load of a predetermined value or more in the cylinder axis Z direction is input to the main body 2 (however, a compressive load having a magnitude such that the outer peripheral side and inner peripheral side deformation control units 5 and 6 do not undergo plastic plastic deformation) As shown in FIG. 3, compression plasticity in the direction of the cylinder axis Z of the deformed portion 3 is performed by the outer peripheral side and inner peripheral side deformation control units 5 and 6 that are not compressed plastically deformed (but elastically deform). At the same time as the deformation, the portion located on the outer peripheral portion of the main body portion 2 in the deformable portion 3 is plastically deformed outward in the radial direction of the main body portion 2 and the portion positioned on the inner peripheral portion of the main body portion 2 is plastically inward in the main body portion 2 radial direction. Deform. In the deformable portion 3, the portions that are plastically deformed outward in the radial direction of the main body portion 2 and the portions that are plastically deformed inward are alternately positioned in the cylinder axis Z direction of the main body portion 2. The compression load is absorbed by the plastic deformation of the deformable portion 3. And the deformation | transformation part 3 spreads to the outer side and inner side of the main-body part 2 radial direction, while the length of the cylinder-axis Z direction becomes short, and does not produce buckling deformation as the whole main-body part 2, but to a cylinder-axis Z direction. Deforms stably.

  Further, when a compression load having such a magnitude that the outer peripheral side and inner peripheral side deformation control units 5 and 6 are subjected to compressive plastic deformation in the cylinder axis Z direction with respect to the main body 2 is input as shown in FIG. The outer peripheral side and inner peripheral side deformation control units 5 and 6 also compressively plastically deform in the cylinder axis Z direction. At this time, as described above, due to the orientation of the reinforcing fibers of the outer peripheral side and inner peripheral side deformation control units 5 and 6, the outer peripheral side and inner peripheral side deformation control units 5 and 6 are directly compression-plastically deformed in the cylinder axis Z direction. . Accompanying this compressive plastic deformation, the outer peripheral side deformation control unit 5 mainly plastically deforms outward in the main body part 2 radial direction, and the inner peripheral side deformation control part 6 mainly undergoes inner plastic deformation in the main body part 2 radial direction. Even during the plastic deformation of the outer peripheral side and inner peripheral side deformation control units 5, 6, the outer peripheral side and inner peripheral side deformation control units 5, 6 are deformed simultaneously with the compressive plastic deformation of the deformation unit 3 in the cylinder axis Z direction. The portion located in the outer peripheral portion of the main body portion 2 in the portion 3 is plastically deformed outward in the radial direction of the main body portion 2 and the portion positioned in the inner peripheral portion of the main body portion 2 is plastically deformed inward in the radial direction of the main body portion 2. . And when the outer peripheral side and inner peripheral side deformation control parts 5 and 6 begin to plastically deform, the deformed part 3 previously plastically deformed has already been greatly plastically deformed outward and inward in the main body part 2 radial direction. . Therefore, even if the outer peripheral side and inner peripheral side deformation control portions 5 and 6 are plastically deformed, the entire body portion 2 is deformed in the cylinder axis Z direction without causing buckling deformation.

  In order to manufacture the impact energy absorbing member 1, first, it is possible to form each of the plurality of outer peripheral side deformation control units 5 and the plurality of inner peripheral side deformation control units 6 by combining with the molten aluminum alloy. A plurality of outer peripheral side preforms 15 (see FIG. 7) and a plurality of inner periphery side preforms 16 (see FIG. 7) are molded. The shapes of the outer peripheral side and inner peripheral side preforms 15 and 16 have the same shape (ring shape) as the outer peripheral side and inner peripheral side deformation control parts 5 and 6, respectively.

  The outer peripheral side and inner peripheral side preforms 15 and 16 are produced as follows. That is, first, the reinforcing fiber, water, and the additive are put in a container (not shown) and mixed by stirring to prepare a slurry 24 (see FIG. 5). The additive includes a reinforcing agent (for example, granular alumina sol) for securing the strength of the outer peripheral side and inner peripheral side preforms 15 and 16, and an adhesion promoter for promoting the adhesion of the reinforcing agent to the reinforcing fibers ( For example, ammonium sulfate) and a dispersant (for example, polyamide) for improving the dispersibility of the reinforcing fiber.

  Subsequently, as shown in FIG. 5, the liquid component such as water in the slurry 24 is 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. At the center of the porous filter 22, a protrusion 22a (not functioning as a filter) protruding upward is formed. 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. 6, the liquid removal member 25 obtained by removing the liquid component in the slurry 24 is compressed. That is, while the liquid removal member 25 is disposed above the peripheral portion of the protrusion 22a in the porous filter 22 in the container 21, the liquid removal member 25 is pressurized by the punch 27 from above to form the outer peripheral side preform 15. Alternatively, compression molding is performed so that the inner peripheral side preform 16 is shaped. 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. Note that the inner diameter of the container 21 and the outer diameter of the protrusion 22a of the porous filter 22 are different between when the outer peripheral side preform 15 is molded and when the inner periphery side preform 16 is molded.

  Subsequently, the demolded liquid removal member 25 is dried and then sintered. This sintering is performed at 640-840 degreeC for 1.5 hours, for example. Thus, the outer peripheral side and inner peripheral side preforms 15 and 16 made of the reinforcing fiber molded body are 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 each of the plurality of outer peripheral preforms 15 are formed on the side peripheral surface of the recessed portion 32a of the fixed mold 32, and the outer periphery of the protruding portion 34a. A plurality of grooves (not shown) for supporting the plurality of inner peripheral side preforms 16 are formed on the surface. 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. Further, an injection plunger 38 is provided in the injection sleeve 37 so as to be slidable with respect to the injection sleeve 37. By moving the injection plunger 38 to the left side of FIG. 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 molded outer peripheral sides are formed in the plurality of grooves formed in the recessed portions 32 a of the fixed mold 32. Each of the preforms 15 is supported, and the plurality of molded inner peripheral preforms 16 are supported in a plurality of grooves formed in the protrusions 34a of the movable mold 34, and then the movable mold 34 is supported. Is moved to the fixed mold 32 side to close the mold. As a result, the outer peripheral side and inner peripheral side preforms 15 and 16 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 at the outer peripheral side and the inner peripheral side preforms 15 and 16 in the cavity 35, and the outer peripheral side and the inner peripheral portion are formed. The holes in the side preforms 15 and 16 are filled with the molten metal, and the outer peripheral side and inner peripheral side preforms 15 and 16 are combined with the molten metal, whereby the outer peripheral side and inner peripheral side deformation control unit 5 is combined. , 6 are integrally formed with the deformable portion 3 and the first and second fixing portions 7,8. 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 includes the deformable portion 3, the plurality of outer peripheral side deformation control units 5 that control the direction of plastic deformation of the deformable portion 3, and the plurality of inner peripheral side deformation controls. The outer peripheral side and inner peripheral side deformation control units 5 and 6 are alternately arranged in the direction of the cylindrical axis Z of the main body 2, and the cylindrical axis Z is relative to the main body 2. When a compressive load of a predetermined value or more is input in the direction, simultaneously with the compressive plastic deformation of the deformable portion 3 in the cylinder axis Z direction, the portion located on the outer peripheral portion of the main body portion 2 in the deformable portion 3 is Since the portion plastically deformed outward and the portion located in the inner peripheral portion of the main body portion 2 is plastically deformed inward in the radial direction of the main body portion 2, the deformable portion 3 has a shorter length in the cylinder axis Z direction and the main body It will spread in a balanced manner to the outside and inside in the radial direction of the part 2. Accordingly, buckling deformation stably deformed in the cylinder axis Z direction without causing the whole main body 2. Moreover, since the deforming part 3 is integrally formed with the outer peripheral side and inner peripheral side deformation control parts 5 and 6, it is difficult to separate from the outer peripheral side and inner peripheral side deformation control parts 5 and 6, The main body 2 is stably deformed in the cylinder axis Z direction. 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, even if the number of outer peripheral side and inner peripheral side deformation control units 5 and 6 is increased, the outer peripheral side and inner peripheral side deformation control units 5 and 6 are firmly and easily fixed to the deforming unit 3 by integral molding. It is possible to improve handling when the impact energy absorbing member 1 is transported or assembled to a vehicle or the like.

(Embodiment 2)
FIG. 8 shows a second embodiment of the present invention, in which the shapes of the outer peripheral side and inner peripheral side deformation control units 5 and 6 are different from those of the first embodiment. This is the same as the first embodiment.

  That is, in this embodiment, the cross-sectional shapes of the outer peripheral side and inner peripheral side deformation control units 5 and 6 are semicircular, and the inner peripheral side of the outer peripheral side deformation control unit 5 and the inner peripheral side deformation control unit 6 Each outer peripheral side has an arc shape. Thereby, it is possible to prevent the compressive load from acting uniformly on the entire deformed portion 3 so as not to concentrate on a specific portion. As a result, the compressive plastic deformation of the deformable portion 3 and the outer and inner sides of the main body portion 2 in the radial direction are achieved. Plastic deformation occurs uniformly, and buckling deformation of the main body 2 is less likely to occur. A state of deformation of the main body 2 (deformation portion 3) at this time is shown in FIG. The manufacturing method of the impact energy absorbing member 1 of the present embodiment is the same as that of the first embodiment.

  Therefore, in this embodiment, compared with the said Embodiment 1, the main-body part 2 can be deform | transformed further stably in the cylinder axis Z direction, and the absorption capability of a compressive load can be improved further.

  In addition, about the cross-sectional shape of the outer peripheral side and the inner peripheral side deformation | transformation control parts 5 and 6, not only the shape of the said Embodiment 1, 2, but various cross-sectional shapes, such as a trapezoid, a triangle, a square, a circle, are applicable. .

  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 a compressive load more than predetermined (compression 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 of the container of the filtration apparatus which shows the state which has removed the liquid component in a slurry. FIG. 6 is a view corresponding to FIG. 5, 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. FIG. 3 is a view corresponding to FIG. 1 showing Embodiment 2 of the present invention. FIG. 6 is a view corresponding to FIG. 3 of a main body portion of an impact energy absorbing member according to Embodiment 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Impact energy absorption member 2 Main body part 3 Deformation part 5 Outer peripheral side deformation control part 6 Inner peripheral side deformation control part 15 Preliminary molded body 30 Casting die 35 Cavity 91 Front side frame 92 Crash can

Claims (7)

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 a compressive load of a predetermined value or more, and undergoes compression plastic deformation in the main body cylindrical axis direction, and the main body circumferential direction at a plurality of locations in the cylindrical axis direction on the outer peripheral portion of the main body A plurality of outer peripheral side deformation control units that are arranged annularly along the outer peripheral side to control the direction of plastic deformation of the deformation unit, and along the circumferential direction of the main body at a plurality of locations in the cylindrical axis direction at the inner peripheral portion of the main body A plurality of inner circumferential side deformation control units that are arranged in a ring shape and control the direction of plastic deformation of the deformation unit,
The outer peripheral side and inner peripheral side deformation control units are alternately arranged in the cylinder axis direction of the main body, and when the predetermined or higher compression load is input to the main body, the main body of the deformation unit At the same time as the compressive plastic deformation in the cylinder axis direction, the portion located in the outer peripheral portion of the main body portion is plastically deformed outward in the radial direction of the main body portion and the portion positioned in the inner peripheral portion of the main body portion is inward in the radial direction of the main body portion. An impact energy absorbing member configured to be plastically deformed. The impact energy absorbing member according to claim 1,
The deformation part is made of an aluminum alloy casting,
The impact energy absorbing member, wherein the outer peripheral side and inner peripheral side deformation control parts are made of an aluminum alloy casting containing reinforcing fibers. The impact energy absorbing member according to claim 2,
The impact energy absorbing member, wherein the reinforcing fiber extends in a radial direction of the main body. The impact energy absorbing member according to claim 2 or 3,
The impact energy absorbing member, wherein the aluminum alloy casting is an Al-Mn-Fe-Mg alloy casting. In the impact energy absorption member according to any one of claims 1 to 4,
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 of a predetermined value or more, and undergoes compression plastic deformation in the main body cylindrical axis direction, and the main body circumferential direction at a plurality of locations in the cylindrical axis direction on the outer peripheral portion of the main body A plurality of outer peripheral side deformation control units that are arranged annularly along the outer peripheral side to control the direction of plastic deformation of the deformation unit, and along the circumferential direction of the main body at a plurality of locations in the cylindrical axis direction at the inner peripheral portion of the main body Each comprising a plurality of inner circumferential side deformation control units that control the direction of plastic deformation of the deformation unit,
The outer peripheral side and inner peripheral side deformation control units are alternately arranged in the cylinder axis direction of the main body, and when the predetermined or higher compression load is input to the main body, the main body of the deformation unit At the same time as the compressive plastic deformation in the cylinder axis direction, the portion located in the outer peripheral portion of the main body portion is plastically deformed outward in the radial direction of the main body portion and the portion positioned in the inner peripheral portion of the main body portion is inward in the radial direction of the main body portion. Configured to plastically deform,
A plurality of outer periphery side preforms and a plurality of inner periphery side preforms capable of forming the plurality of outer periphery side deformation control units and the plurality of inner periphery side deformation control units respectively by compounding with the molten metal. Forming the step,
With the molded outer peripheral side and inner peripheral side preforms set in the cavity of the mold, the molten metal is supplied into the cavity, so that the molten metal, the outer peripheral side and the inner peripheral side preform are And a step of integrally forming the deformable portion and the outer peripheral side and inner peripheral side deformation control portion. In the manufacturing method of the impact energy absorption member according to claim 6,
The metal is an aluminum alloy,
The method for producing an impact energy absorbing member, wherein the outer peripheral side and inner peripheral side preforms are formed of reinforcing fiber moldings.

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