JP5163354B2 - Method for manufacturing impact energy absorbing member - Google Patents

Description

The present invention absorbs compressive load input in the cylinder axis direction with respect to the cylindrical body portion, belonging to the technical field relates to a method for manufacturing a crush can such suitable impact energy absorbing member of the vehicle.

  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 a manufacturing method of an impact energy absorbing member excellent in handling properties.

In order to achieve the above object, according to the first aspect of the present invention, there is provided a shock absorber that has a cylindrical main body portion and absorbs a compressive load input to the main body portion in the cylinder axis direction of the main body portion. as process for the production of members, the body portion includes a deformable portion for compressive plastic deformation to the body part cylinder axis direction by receiving the result and predetermined or more of the compression load of a metal, a plurality of places of the cylinder axis direction in the body portion And a plurality of deformation control units that control the direction of plastic deformation of the deformable portion, and the deformation control unit has a compressive load greater than or equal to the predetermined value on the main body portion. Is set to an arrangement and a shape that causes the deformation portion to be plastically deformed to at least one of the outer side and the inner side in the main body radial direction simultaneously with the compressive plastic deformation in the main body cylindrical axis direction, By combining with molten metal A step of forming a plurality of preforms each capable of forming a plurality of deformation control units, and a state where the molded preform is set in a cavity of a mold, the molten metal is placed in the cavity. And the step of combining the molten metal and the preform and integrally forming the deformation portion and the deformation control portion.

According to the present invention, by combining the preform and the molten metal , the deformable portion and the deformation control portion can be easily integrally formed, and can be stably deformed in the main body cylinder axis direction. In addition, an impact energy absorbing member excellent in handleability can be easily manufactured. That is, when a predetermined or greater compressive load is input in the cylinder axis direction to the main body portion of the impact energy absorbing member, the deformation portion is simultaneously deformed by the deformation control portion by the deformation control portion in the main body portion cylindrical axis direction. It is possible to plastically deform outward and / or inward in the radial direction, and to absorb the compressive load (impact energy) by such plastic deformation of the deformed portion. In addition, since the deforming portion is deformed so that the length in the main body portion cylindrical axis direction is shortened and spreads outward and / or in the main body portion radial direction, the entire main body portion is not buckled and deformed in the cylindrical axis direction. Deforms stably. In addition, since the deformed portion is formed integrally with the deformation control portion by combining the preform and the molten metal, it is difficult to separate from the deformation control portion. 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 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.

According to a second aspect of the present invention, in the first aspect of the invention, the deformation portion and the deformation control portion are alternately stacked in the cylinder axis direction of the main body portion, and the surface of the deformation control portion that contacts the deformation portion is The inclined surface is inclined toward one side or the other side in the main body cylinder axis direction toward the outer side in the main body radial direction.

Thus, in the impact energy absorbing member, the deformed portion is plastically deformed outward and / or inward in the main body radial direction simultaneously with the compressive plastic deformation in the main body cylindrical axis direction by the inclined surface of each deformation control portion. Thus, such an impact energy absorbing member can be easily manufactured.

According to a third aspect of the invention, in the first or second aspect of the invention, the metal is an aluminum alloy, and the preform is a reinforcing fiber molded body.

As a result, in the impact energy absorbing member, the deformation control unit is more difficult to be plastically plastically deformed and more difficult to break than the deformed portion due to the reinforcing fibers, and the plastic deformation direction of the deformed portion can be reliably controlled. Further, the impact energy absorbing member can be reduced in weight. And such an impact energy absorption member can be manufactured easily.

As described above, according to the manufacturing method of the impact energy absorbing member of the present invention, in the state of molding a plurality of preforms and the plurality of molded preforms set in the cavity of the mold, By supplying the molten metal into the cavity, the molten metal and each preform are combined, and the step of integrally forming the deformation portion and the deformation control portion is included, so that the main body portion is seated. It is possible to easily manufacture an impact energy absorbing member that can be stably deformed in the cylinder axis direction without being bent and deformed and that is excellent in handleability.

  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 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 includes a plurality of (four in the present embodiment) deformable portions 3 that undergo a compressive plastic deformation in the cylinder axis Z direction upon receiving a predetermined or greater compressive load in the cylinder axis Z direction with respect to the main body 2, and the main body A plurality (five in this embodiment) of deformation control units that are annularly arranged along the circumferential direction of the main body unit 2 at a plurality of locations in the cylinder axis Z direction of the unit 2 and control the direction of plastic deformation of the deformation unit 3. 4 is integrally formed. 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. The arrangement and shape are forcibly plastically deformed (reduced diameter deformation).

  Specifically, the plurality of annular deformation portions 3 and the plurality of annular deformation control portions 4 are alternately stacked in the cylinder axis Z direction of the main body portion 2 and are in contact with the deformation portions 3 of the respective deformation control portions 4. The surface 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 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 as each other outward in the radial direction of the main body portion. 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 compressive load from acting uniformly on all the deformable portions 3 and concentrating on the specific deformable portion 3.

  In this embodiment, the said deformation | transformation part 3 consists of aluminum alloy castings, and the said deformation | transformation control part 4 consists of aluminum alloy castings containing the reinforced fiber. The deformation section 3 and the deformation control section 4 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.

  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).

In this way, the deformation control unit 4 is reinforced by the composite of the aluminum alloy that is the constituent material of the deformation unit 3 and the reinforcing fiber, and is subjected to compressive plastic deformation than the deformation unit 3 with respect to the compressive load in the cylinder axis Z direction. As a result, a compressive load greater than or equal to a predetermined value in the direction of the cylinder axis Z (provided that the deformation control unit 4 does not compressively plastically deform) is input to the main body 2. In some cases, as shown in FIG. 3, the deformation control unit 4 does not undergo plastic plastic deformation (but undergoes elastic deformation), and the deformation unit 3 undergoes plastic plastic deformation 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. The compressive 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.

Further, when a compressive 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, as shown in FIG. 4, the deformation control unit 4 is also connected to the cylinder axis. 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 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. The body 15 is molded. Each preform 15 has the same shape as the deformation control unit 4. Note that 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 end portions in the cylinder axis Z direction of the main body unit 2.

  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 liquid removal member 25 obtained by removing the liquid component in the slurry 24 is compressed. That is, the shape of the preform 15 is formed by pressurizing the liquid removal member 25 from above with the punch 27 while the 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. 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.

  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. 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. 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 plurality of deformation portions 3 and the plurality of deformation control portions 4 that control the direction of plastic deformation of the deformation portions 3. It is integrally molded in a state of being alternately stacked in the Z direction, and a surface in contact with the deformation portion 3 of each deformation control portion 4 is an inclined surface 4a, whereby a predetermined amount or more in the cylinder axis Z direction with respect to the main body portion 2 When the compressive load is input, the deformable portion 3 is plastically deformed inward in the radial direction of the main body portion 2 simultaneously with the compressive plastic deformation in the tube axis Z direction. While the length in the direction is shortened, the main body portion 2 spreads inward in the radial direction, so that the main body portion 2 as a whole is stably deformed in the cylinder axis Z direction without causing buckling deformation. Moreover, since the deformable portion 3 is integrally formed with the deformation control portion 4, it is difficult to separate from the deformation control portion 4, and this also allows the main body portion 2 to be stably deformed in the cylinder axis Z direction. Become. 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)
FIG. 9 shows a second embodiment of the present invention, in which the shape of the deformation control unit 4 is different from that of the first embodiment.

  That is, in the present embodiment, the outer shape of each deformation control unit 4 in the main body 2 of the impact energy absorbing member 1 (the shape of the inclined surface 4a) is the same as that in the first embodiment, but the cylinder shaft in the main body 2 is the same. The three deformation control units 4 other than the two deformation control units 4 positioned at both end portions in the Z direction are recessed from the outer peripheral surface (surface constituting the outer peripheral surface of the main body) toward the inner peripheral side. A recess 4 b is provided over the entire circumference of the deformation control unit 4. And the deformation | transformation part 3 is located in each recessed part 4b, respectively. Further, similarly to the first embodiment, the deformation units 3 are located between the five deformation control units 4. Hereinafter, when the deformation part 3 between the deformation control parts 4 and the deformation part 3 in the concave part 4b are distinguished, the deformation part 3 between the deformation control parts 4 is referred to as a large deformation part 3a, and the deformation part in the concave part 4b. Is referred to as a small deformation portion 3b. The volume of the small deformation part 3b is smaller than the volume of the large deformation part 3a.

  Due to the arrangement of the deformation portion 3, four deformation portions 3 (large deformation portions 3 a) and five deformation control portions 4 are alternately stacked in the cylinder axis Z direction of the main body portion 2 on the inner peripheral side of the main body portion 2. On the outer peripheral side of the main body 2, seven deformation portions 3 (four large deformation portions 3 a and three small deformation portions 3 b) and eight deformation control portions 4 are alternately stacked in the cylinder axis Z direction of the main body portion 2. It can be said that.

  The length of each concave portion 4b in the cylinder axis Z direction increases toward the radially outer side of the main body 2. That is, the surface in contact with the small deformation portion 3 b of each deformation control portion 4 is also an inclined surface 4 c 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. However, the inclined surface 4c allows the small deformation portion 3b to move the main body 2 simultaneously with the compressive plastic deformation in the cylinder axis Z direction when a compression load greater than a predetermined value is input to the main body portion 2 in the cylinder axis Z direction. The part 2 is inclined so as to be plastically deformed outward in the radial direction.

  Also in this embodiment, the deformation | transformation part 3 consists of aluminum alloy castings similarly to the said Embodiment 1, and the deformation | transformation control part 4 consists of aluminum alloy castings containing the reinforced fiber. In addition, the materials described in the first embodiment can be used for the materials of the deformable portion 3 and the deformation control portion 4 (the same applies to later-described third and fourth embodiments). And these deformation | transformation part 3 and the deformation | transformation control part 4 are integrally molded by compounding with the molten metal of aluminum alloy, and the preforming body which consists of a reinforced fiber molded object.

  When a compressive load greater than a predetermined value is input to the main body 2 in the cylinder axis Z direction (however, a large compressive load that does not cause the plastic deformation of the deformation control unit 4), as shown in FIG. Similar to the first embodiment, the deformable portion 3a is plastically deformed inward in the main body portion 2 radial direction simultaneously with the compressive plastic deformation in the cylinder axis Z direction. Here, the amount of elastic deformation in the cylinder axis Z direction on the outer peripheral side of the deformation control unit 4 is larger than that on the inner peripheral side due to the presence of the recess 4b. Due to the elastic deformation on the outer peripheral side of the deformation control section 4, the small deformation section 3b is plastically deformed outward in the radial direction of the main body section 2 simultaneously with the compressive plastic deformation in the cylinder axis Z direction. The amount of plastic deformation to the outside in the main body portion 2 radial direction in the small deformation portion 3 b is smaller than the amount of plastic deformation to the inside in the main body portion 2 radial direction in the large deformation portion 3 a.

  The inclination angle θ of the inclined surface 4a is reduced by the elastic deformation on the outer peripheral side of the deformation control unit 4, and the inclination angle θ is set larger than that of the first embodiment in consideration of the decrease of the inclination angle θ. It is preferable to keep it.

In addition, when a compressive 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 compressively plastically deformed in the cylinder axis Z direction. . At this time, the reaction force received by the inclined surface 4a from the large deformation portion 3a and the reaction force received by the inclined surface 4c from the small deformation portion 3b cancel each other (the reaction force received by the inclined surface 4a from the large deformation portion 3a is greater). The deformation control unit 4 is not plastically deformed outward in the radial direction of the main body unit 2 as in the first embodiment. And even if the deformation | transformation control part 4 deforms plastically, like the said Embodiment 1, the main-body part 2 whole deform | transforms in the cylinder axis Z direction, without producing buckling deformation.

  The manufacturing method of the impact energy absorbing member 1 of the present embodiment is the same as the method described in the first embodiment, and the plurality of deformation control units 4 may be formed by combining with the molten aluminum alloy. A plurality of possible preforms are formed, and the preforms thus formed are set in the cavities 35 of the casting mold 30 described in the first embodiment. The molten metal and the preforms are combined to form the deformable portion 3, the deformation control portion 4, and the first and second fixing portions 7 and 8. When each preform is molded, a recess corresponding to the recess 4b of the deformation control unit 4 is formed in the preform. The concave portion of the preform can be formed by using a mold corresponding to the concave portion in the container 21 of the filtration device 20.

  Therefore, in this embodiment, in addition to the large deformation portion 3a being plastically deformed inward in the radial direction of the main body portion 2 simultaneously with the compressive plastic deformation in the cylinder axis Z direction, the small deformation portion 3b is At the same time as the plastic deformation of the body, it is plastically deformed outward in the radial direction of the main body 2, so that the same effects as those of the first embodiment can be obtained, It can be spread in a balanced manner on the outer side and the inner side, and the buckling deformation of the main body 2 can be more reliably prevented.

(Embodiment 3)
FIG. 11 shows a third embodiment of the present invention. Instead of the deformation control unit 4 of the first embodiment, a plurality of outer peripheral side deformation control units 5 are arranged on the outer peripheral part of the main body unit 2, A plurality of inner periphery side deformation control units 6 are arranged on the periphery.

  That is, in the present embodiment, the main body 2 of the impact energy absorbing member 1 is annularly arranged along the circumferential direction of the main body 2 at a plurality of locations in the cylindrical axis Z direction on the outer periphery of the deformable portion 3 and the main body 2. And a plurality of outer peripheral side deformation control sections 5 for controlling the direction of plastic deformation of the deformable section 3 and a plurality of locations in the cylindrical axis Z direction on the inner peripheral section of the main body section 2 along the circumferential direction of the main body section 2 respectively. And a plurality of inner peripheral deformation control units 6 for controlling the direction of plastic deformation of the deformation unit 3 are integrally formed. 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. At the same time, the portion located in the inner periphery of the main body 2 is forcibly plastically deformed inward in the radial direction of the main body 2.

  Also in the present embodiment, as in the first embodiment, the deformable portion 3 is made of an aluminum alloy casting, and the outer peripheral side and inner peripheral side deformation control portions 5 and 6 are made of an aluminum alloy cast containing reinforcing fibers, The deformable portion 3 and the outer peripheral side and inner peripheral side deformation control portions 5 and 6 are integrally formed by combining a molten aluminum alloy and a preformed body made of a reinforcing fiber molded body. 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.

In the present embodiment, it is preferable that the reinforcing fibers of the outer peripheral side and inner peripheral side deformation control parts 5 and 6 extend in the radial direction of the main body part 2. This is because when a compressive load having such a magnitude that the outer peripheral side and inner peripheral side deformation control parts 5 and 6 are subjected to compressive plastic deformation in the cylinder axis Z direction with respect to the main body 2 is input. This is because the circumferential deformation control units 5 and 6 are subjected to compression plastic deformation straight in the cylinder axis Z direction to suppress buckling deformation of the main body unit 2.

  The deformation portion 3 is located in a portion other than the outer peripheral side and inner peripheral side deformation control portions 5 and 6 in the main body portion 2. That is, the deforming portion 3 is one that extends over the entire cylinder axis Z direction in the main body portion 2 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 of the part 2 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. 12, the outer peripheral side and inner peripheral side deformation control units 5 and 6 are portions positioned on the outer peripheral portion of the main body portion 2 in the deformable portion 3 simultaneously with the compressive plastic deformation of the deformable portion 3 in the cylinder axis Z direction. Is plastically deformed outward in the main body portion 2 radial direction, and a portion located in the inner peripheral portion of the main body portion 2 is plastically deformed inward in the main body portion 2 radial direction. 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.

Further, when a compressive 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 to the outer peripheral side and the inner peripheral side. The 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, the outer peripheral side and inner peripheral side deformation control units 5 and 6 are compressively 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.

  The manufacturing method of the impact energy absorbing member 1 of the present embodiment is the same as the method described in the first embodiment. By combining the molten aluminum alloy with the molten aluminum alloy, the plurality of outer peripheral side deformation control units 5 and the plurality of inner members are manufactured. A plurality of outer periphery side preforms and a plurality of inner periphery side preforms each capable of forming the circumferential side deformation control unit 6 are formed, and the outer periphery side and inner periphery side preforms are cast into a casting mold. The molten aluminum alloy is supplied into the cavity 35 in a state of being set in the cavity 35, so that the molten metal, the outer peripheral side and the inner peripheral side preform are combined, and the deformed portion 3, the outer periphery The side and inner peripheral side deformation control parts 5 and 6 and the first and second fixing parts 7 and 8 are integrally formed. The plurality of inner peripheral side preforms 6 are respectively supported by the plurality of grooves of the projecting portions 34a of the movable mold 34 as in the first embodiment, but the plurality of outer periphery side preforms 5 are fixed. The mold 32 is supported by a plurality of grooves formed on the side wall surface of the recessed portion 32a.

  Therefore, in this embodiment, simultaneously with the compressive plastic deformation of the deformable portion 3 in the cylinder axis Z direction, the portion located in 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 main body. Since the portion located in the inner peripheral portion of the portion 2 is plastically deformed inward of the main body portion 2 in the radial direction, the deformable portion 3 spreads in a well-balanced manner outward and inward in the radial direction as the main body portion 2 as a whole. Similar effects can be obtained.

(Embodiment 4)
FIG. 13 shows a fourth 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 third 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. FIG. 14 shows how the main body 2 (deformation part 3) is deformed at this time. The manufacturing method of the impact energy absorbing member 1 of the present embodiment is the same as that of the third embodiment.

  Therefore, in this embodiment, compared with the said Embodiment 3, 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 3 and 4 but various cross-sectional shapes, such as a trapezoid, a triangle, a square, and 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 compressive load of the magnitude | size which a plastic deformation of a deformation | transformation control part 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. 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. It is FIG. 1 equivalent view which shows Embodiment 3 of this invention. FIG. 6 is a view corresponding to FIG. 3 of a main body portion of an impact energy absorbing member according to Embodiment 3. It is FIG. 1 equivalent view which shows Embodiment 4 of this invention. FIG. 6 is a view corresponding to FIG. 3 of a main body portion of an impact energy absorbing member according to a fourth embodiment.

DESCRIPTION OF SYMBOLS 1 Impact energy absorption member 2 Main body part 3 Deformation part 4 Deformation control part 4a Inclined surface 4c Inclined surface 5 Outer peripheral side deformation control part 6 Inner peripheral side deformation control part 15 Preliminary body 30 Casting die 35 Cavity 91 Front side frame 92 Crash Kang

Claims (3)

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 a metal and receives a compressive load of a predetermined value or more, and deforms and compressively plastically deforms in the main body cylinder axis direction, and along the main body circumferential direction at a plurality of positions in the cylinder axis direction of the main body section. Each comprising a plurality of deformation control units arranged annularly and controlling the direction of plastic deformation of the deformation unit,
The deformation control unit, when a compressive load greater than or equal to the predetermined value is input to the main body unit, causes the deformation unit to be at least on the outer side and the inner side in the main body radial direction simultaneously with the compressive plastic deformation in the main body unit cylindrical axis direction. It is set to an arrangement and shape that plastically deforms to one side,
Forming a plurality of preforms capable of forming each of the plurality of deformation control units by combining with the molten metal;
In the state where the molded preform is set in the cavity of the mold, the molten metal is supplied into the cavity, so that the molten metal and the preform are combined, and the deformed portion and deformation control are combined. A method of manufacturing the impact energy absorbing member. In the manufacturing method of the impact energy absorption member according to claim 1 ,
The deformation part and the deformation control part are alternately stacked in the cylinder axis direction of the main body part,
The impact energy absorption, wherein a surface of each of the deformation control units 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 cylindrical direction toward the outer side in the main body radial direction. Manufacturing method of member. In the manufacturing method of the impact energy absorption member according to claim 1 or 2 ,
The metal is an aluminum alloy,
The said preforming body consists of a reinforced fiber molded object, The manufacturing method of the impact energy absorption member characterized by the above-mentioned.

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