JP2010075935A - Die quenched product, method and apparatus for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing by which die quenched products on ridgelines in the bent parts of which bend parts having a S-shaped cross section are formed, which are light in weight and highly strengthened are manufactured at high productivity and at a reduced cost. <P>SOLUTION: In a method for manufacturing hat-shaped die-quenched products on which the bend part having the S-shaped cross section is formed on the ridgelines of the bent parts by die quenching, the bent parts Wa are formed by performing the press forming in a flat part (side face parts Wb, flange parts Wc and a top surface part Wd) excepting for the bend part Wa of a heated metallic sheet W1 with an upper die 1 and a lower die 2, and compressing the bent parts Wa in the space S where is formed between the upper die 1 and the lower die 2 arranged vertically, the bend parts having the S-shaped cross section are formed on the ridgelines in the bent parts Wa, while keeping high temperature state without contacting the bend part Wa with the upper die 1 and the lower die 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hat-shaped die quench processed product formed by forming a bent portion having an S-shaped cross section on a ridge line of a bent portion, a manufacturing method thereof, and a manufacturing apparatus.

For example, automobile parts can be obtained by press-molding a metal plate material (blank material) such as a steel plate. Recently, for the purpose of improving fuel efficiency and safety, automobile parts are strongly required to be lighter and stronger. It has been.
There is a problem that the plate thickness is partially reduced and the strength and rigidity of the portion are sometimes lowered.

  Therefore, in order to increase the strength of automobile parts, a method of increasing the thickness of the material plate or welding another part to a portion to be reinforced is conventionally employed.

Patent Document 1 proposes a method and an apparatus for manufacturing a molded product having a convex portion having a T-shaped cross section continuous in the longitudinal direction using a superplastic metal material.
JP 2007-038255 A

  However, if the thickness of the material plate is increased to increase the strength as in the conventional case, the strength of the product is improved, but the weight of the product is increased, and there is a problem that the cost cannot be increased. Further, in the method of welding another part to the part to be reinforced, there is a problem that the manufacturing process increases and the manufacturing cost increases because a welding process is added to the manufacturing process.

  Furthermore, the molded product manufactured by the method and apparatus described in Patent Document 1 has a problem that the strength cannot be increased because the material is a superplastic metal material, and high strength cannot be expected. is there.

  The present invention has been made in view of the above problems, and the object of the process is a lightweight and high-strength die quench processed product in which a bent portion having an S-shaped cross section is formed on the ridge line of the bent portion, and productivity thereof. It is an object of the present invention to provide a manufacturing method and a manufacturing apparatus which can be obtained at a good cost.

  In order to achieve the above object, the invention described in claim 1 is characterized in that a bent portion having an S-shaped cross section is formed on the ridge line of the bent portion of a metal die quench processed product formed into a hat shape by die quench processing. To do.

  The invention according to claim 2 is a method for producing a hat-shaped die quench processed product in which a bent portion having an S-shaped cross section is formed on the ridge line of the bent portion by die quenching, and is a flat method excluding a bent portion of a heated metal plate. The bent part was formed by sandwiching the part between the upper and lower press dies and press forming, and the bent part was formed between the upper and lower press dies while maintaining the high temperature state without contacting the bent part with the press dies. It is characterized in that a bent portion having an S-shaped cross section is formed on the ridge line of the bent portion by compressing in the space.

  According to a third aspect of the present invention, a bent portion having an S-shaped cross section is formed on the ridge line of the bent portion by die quenching using a die having a fixed punch and a movable punch and a press die having a fixed die and a die having a movable die. In the apparatus for producing a hat-shaped die quench processed product, when the flat portion excluding the bent portion of the heated metal plate is sandwiched between the upper die and the lower die of the press die and press-formed and bent, the metal plate A feature is that a space is formed between the upper die and the lower die so that the bent portion of the upper die does not contact the press die.

  In the die-quenched processed product according to the present invention, since a bent portion having an S-shaped cross section is formed on the ridge line of the bent portion, the strength and rigidity of the bent portion are enhanced by the bent portion having the S-shaped cross section during molding. Reduced weight and strength of processed products.

  Moreover, according to the manufacturing method and the manufacturing apparatus of the die quench processed product according to the present invention, the bent portion is formed by sandwiching the flat portion excluding the bent portion of the heated metal plate with the upper and lower press dies and press-molding. The bent portion is compressed in the space formed between the upper and lower press dies while keeping the high temperature state without contacting the bent portion with the press die to form a bent portion having an S-shaped cross section at the ridge line of the bent portion. Therefore, a bent portion having an S-shaped cross section is formed on the ridge line of the bent portion of the molded article in only one step of the pressing step, and the strength and rigidity of the bent portion are enhanced by this bent portion. As a result, a lightweight and high-strength die quench processed product can be manufactured with high productivity and at low cost.

  In addition, when the flat part excluding the bent part of the heated metal plate is sandwiched between the upper and lower press dies, the flat part excluding the bent part of the metal plate is quenched because it is quenched by the mold. Cured. In addition, the bent portion of the metal plate that is initially kept at a high temperature without contacting the mold is cooled by contact with the mold when it is subsequently compressed and bent into a S-shaped cross section. Harden.

  Further, in the present invention, by utilizing the material characteristics of a soft metal plate at a high temperature, the bent portion to be reinforced of the metal plate is compressed in the press mold space while maintaining the high temperature state, and the ridge line is formed with an S-shaped cross section. Since the bent portion is partially formed, the bent portion can be easily formed.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 4 are cross-sectional views of a manufacturing apparatus showing a method of manufacturing a die quench processed product according to the present invention in the order of the steps, FIG. 5 is an enlarged detail view of part A of FIG. 4, and FIG. FIG. 7 is a cross-sectional view of the die-quenched product.

  First, the basic configuration of a die quench processed product manufacturing apparatus according to the present invention will be described with reference to FIGS. 1 to 4. In the figure, reference numerals 1 and 2 denote an upper die and a lower die constituting a press die, 1 is composed of a fixed punch 11 that is long in the direction perpendicular to the paper surface of the drawing, and a movable punch 12 that is fitted and held in the center of the fixed punch 11 so as to be movable up and down. Here, the movable punch 12 is a block-shaped mold that is long in the direction perpendicular to the drawing sheet, and is held by a cushion pin 13 that passes through the fixed punch 11 so as to be movable up and down.

  The lower die 2 is composed of a fixed die 21 that is long in the direction perpendicular to the paper surface of the figure, and a movable die 22 that is also long in the direction perpendicular to the paper surface of the figure. It is fitted and held by a cushion pin 23 penetrating the fixed die 21 so as to be movable up and down.

  In addition, a plurality of cooling pipes (not shown) are provided near the processing surfaces of the fixed punch 11, the movable punch 12, the fixed die 21, and the movable die 22, and a cooling medium such as cooling water or refrigerant is placed in these cooling pipes. Since the surface of the upper mold 1 and the lower mold 2 can be cooled to cool the metal plate W1 in contact with the upper mold 1 and the lower mold 2, the strength and rigidity can be further enhanced and continuous processing can be performed. Is possible.

  By the way, the upper mold 1 and the lower mold 2 configured as described above are driven by a press machine (not shown) which is a pressurizing unit and subjected to a required die quench process.

  Next, a method of manufacturing a hat-shaped die quench processed product W as shown in FIG. 6 using the manufacturing apparatus configured as described above will be described with reference to FIGS.

  At the time of die quenching, a metal plate (blank material) W1 heated to a predetermined temperature is set horizontally on the movable die 22 of the lower mold 2, and when die quenching is started, as shown in FIG. The upper die 1 located above the lower die 2 is lowered, and the metal plate W1 set on the movable die 22 of the lower die 2 is pressed by the upper die 1 and the lower die 2. Here, a steel plate is used for the metal plate W1, and this steel plate is heated to 900 ° C. to 950 ° C.

  Then, while maintaining the positional relationship between the fixed punch 11 and the movable punch 12 of the upper mold 1, the upper mold 1 further moves downward, and as shown in FIG. 2, the fixed punch 11 and the movable punch 12 of the upper mold 1 are moved. When the movable die 22 and the fixed die 21 of the lower die 2 are brought into contact with each other, the metal plate W1 is formed into a hat shape (channel shape) having a U-shaped cross section, and between the upper die 1 and the lower die 2. In FIG. 2, spaces S that are long in the direction perpendicular to the paper surface are formed on both sides of the movable punch 12 of the upper die 1. In this state, the left and right side surfaces Wb except the bent portion Wa of the heated metal plate W1, the left and right flange portions Wc, and the top surface portion (bottom surface portion in the figure) Wd are sandwiched between the upper mold 1 and the lower mold 2 and cooled. The side surface portion Wb, the flange portion Wc, and the top surface portion Ed (flat portion) are hardened by being hardened.

  On the other hand, the left and right bent portions Wa of the metal plate W1 are cooled because they face the space S formed between the upper mold 1 and the lower mold 2 and do not contact the upper mold 1 and the lower mold 2. Without maintaining a high temperature state.

  Next, when the upper die 1 is further moved downward from the state shown in FIG. 2, the movable punch 12 of the upper die 1 is in contact with the fixed die 21 of the lower die 2 and is not moved. While pressing the movable die 22 of the lower mold 2, the lower die 2 descends with the movable die 22, and the bent portion Wa of the metal plate W <b> 1 is compressed in the space S. Then, when the fixed punch 11 of the upper die 1 is further moved downward and comes into contact with the fixed die 21 of the lower die 2 as shown in FIG. 4, the bent portion Wa of the metal plate W1 becomes as shown in detail in FIG. Further, the bent portion is compressed and bent, and a bent portion a having an S-shaped cross section is formed at the ridgeline of the bent portion Wa. When the bent portion a having the S-shaped cross section is formed on the ridge line of the bent portion Wa of the metal plate W1, the bent portion a contacts the fixed punch 11 of the upper die 1 and the movable die 22 of the lower die 2. Then, the bent portion a is quenched and hardened.

  A hat-shaped (channel-shaped) die-quenched product W as shown in FIGS. 6 and 7 is manufactured through the above steps, and a bent portion a having an S-shaped cross section is formed on the ridgeline of the left and right bent portions Wa. Are continuously formed along the longitudinal direction, and the strength and rigidity of the portion are enhanced by the bent portion a.

  By the way, the bent portion of the molded product formed into a hat shape by die quench processing has a reduced plate thickness, and the strength and rigidity of the portion are reduced. However, in the die quench processed product W according to the present invention, the ridge line of the bent portion Wa Since the bent portion a having a S-shaped cross section is formed in the bent portion Wa, the strength and rigidity of the bent portion Wa whose thickness is reduced during molding is increased by the bent portion a having the S-shaped cross section, thereby reducing the weight of the die quench processed product W. Strengthening is achieved. In addition, when the bending part a was formed in the ridgeline of the bending part Wa of the die quench processed product W, about 1.5 times the intensity | strength of the molded product without the bending part a was obtained.

  Moreover, according to the manufacturing method and manufacturing apparatus of the die quench processed product W which concerns on this invention, the side part Wb except the bending part Wa of the heated metal plate W1, the flange part Wc, and the top | upper surface part Ed (flat part) are upper mold | types. The bent portion Wa is formed by sandwiching between 1 and the lower mold 2 and press forming, and the bent portion Wa is maintained in the upper mold while maintaining the high temperature state without contacting the bent portion Wa with the upper mold 1 and the lower mold 2. Since the bent portion a having a S-shaped cross section is formed in the ridgeline of the bent portion Wa by compressing in the space S formed between the first die 2 and the lower mold 2, the die quench processed product W is formed in only one step of the pressing step. A bent portion a having an S-shaped cross section is formed on the ridge line of the bent portion Wa, and the strength and rigidity of the bent portion Wa are enhanced by the bent portion a. As a result, a lightweight and high-strength die quench processed product W as shown in FIGS. 6 and 7 can be manufactured with high productivity and at low cost.

  In the present invention, by utilizing the material characteristics of the soft metal plate W1 at high temperatures, the bending portion Wa to be reinforced of the metal plate W1 is bent in the space S between the upper die 1 and the lower die 2 while maintaining the high temperature state. Since the portion Wa is compressed to partially form the bent portion a having an S-shaped cross section on the ridgeline, the bent portion a is easily formed.

It is sectional drawing of a manufacturing apparatus about the manufacturing method of the die quench processed product which concerns on this invention. It is sectional drawing of a manufacturing apparatus about the manufacturing method of the die quench processed product which concerns on this invention. It is sectional drawing of a manufacturing apparatus about the manufacturing method of the die quench processed product which concerns on this invention. It is sectional drawing of a manufacturing apparatus about the manufacturing method of the die quench processed product which concerns on this invention. It is the A section enlarged detail drawing of FIG. It is a perspective view of the die quench processed product which concerns on this invention. It is a cross-sectional view of the die quench processed product according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper mold | type 2 Lower mold | type 11 Fixed punch 12 Movable punch 13 Cushion pin 21 Fixed die 22 Movable die 23 Cushion pin a Bending part S Space W Die quench processing product W1 Metal plate Wa Metal plate bending part Wb Metal plate side part Wc Metal Plate flange Wd Top of metal plate

Claims (3)

  A die-quenched product, which is a metal product formed into a hat shape by die-quenching, wherein a bent part having an S-shaped cross section is formed on the ridge line of the bent part. A method for producing a hat-shaped die quench processed product in which a bent portion having an S-shaped cross section is formed on the ridge line of the bent portion by die quenching,
A flat part excluding the bent part of the heated metal plate is sandwiched between upper and lower press dies to form a bent part, and the bent part is kept in a high temperature state without being brought into contact with the press dies. A die quench processed product manufacturing method comprising: forming a bent portion having an S-shaped cross section on a ridge line of a bent portion by compressing a portion in a space formed between upper and lower press dies. A die-quenched product having a hat-shaped die-quenched product in which a bent portion having an S-shaped cross section is formed on the ridge line of the bent portion by die quenching using a die having a fixed punch and a movable punch and a press die having a die having a fixed die and a movable die An apparatus for manufacturing
When the flat portion excluding the bent portion of the heated metal plate is sandwiched between the upper die and the lower die of the press die and subjected to press molding and bent, the upper die and the lower die are prevented from contacting the press die. An apparatus for manufacturing die-quenched products, characterized in that a space is formed between the molds.

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