JP2017080758A - Hot press working apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a foreign matter entering the interval between mating surfaces of a first mold 21 and a second mold 22, in a hot press working apparatus in which a punch 1 comprises the first mold 21, and the second mold 22 for mould release which becomes movable.SOLUTION: A coolant exhaust nozzle 25 for cooling a workpiece is opened on a mold surface of a first mold 21, and a coolant exhaust nozzle 28 is opened on at least either of mutual mating surfaces of the first mold 21 and a second mold 22, and the coolant is jetted out between the mating surfaces, to thereby remove a foreign matter entering the interval between the mating surfaces of both molds 21, 22.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a hot press working apparatus that performs press forming and cooling of a heated metal workpiece.

  Hot press processing (hot press) is generally known in which a heated workpiece (steel plate) is rapidly cooled while being molded with a mold to obtain a quenched and hardened press-formed product. For example, Patent Document 1 includes an upper mold and a lower mold, and after cooling the work by supplying a coolant to the work from a refrigerant discharge opening opened on the molding surface of the lower mold, Describes that the liquid refrigerant adhering to the surface of the workpiece is removed by jetting gas.

WO2012 / 161192

  By the way, it is known that when the workpiece is hardened and hardened, the volume of the workpiece expands, but at the same time, the phenomenon that the size of the workpiece shrinks is also observed. In the case of hot pressing, the workpiece is rapidly cooled while being pressed by a punch and a die, and therefore, the workpiece may be in a state of biting on the punch or die in accordance with the volume expansion or dimensional change. In that case, the workpiece cannot be released smoothly.

  On the other hand, it is conceivable that a part of the punch or die is divided into a movable mold for release, and the workpiece is released by protruding the mold for release after press forming the workpiece. However, in such a case, foreign matters such as dust may enter the gaps between the mating surfaces of the divided dies when the workpiece is pressed or cooled. In that case, when the mold for mold release is moved, there is a possibility that the mating surface of the mold is damaged due to the foreign matter, or that the mold for mold release is malfunctioning.

  Therefore, the present invention eliminates foreign matter between the mating surfaces of the molds.

  In the present invention, in order to solve the above-described problems, the refrigerant is ejected from the mating surface of the mold.

The hot press working apparatus disclosed herein is an apparatus that performs press forming and cooling of a heated metal workpiece by a punch and a die,
At least one of the punch and die includes a first mold and a second mold for mold release that is movable in the mold release direction of the workpiece with respect to the first mold,
A series of molding surfaces for molding the workpiece is configured by combining the first mold and the second mold,
A coolant fluid jet opening for cooling the workpiece is opened on the molding surface of the first mold, and the coolant fluid is jetted onto at least one of the mating surfaces of the first mold and the second mold. The outlet is open.

  According to this hot press working apparatus, even if foreign matter enters between the mating surfaces of the first die and the second die, at least one of the first die and the second die when the press-formed workpiece is cooled. The foreign matter is removed from between the mating surfaces by the refrigerant fluid ejected from the jet opening opened in the mating surfaces. Therefore, the operation of the second mold for mold release becomes smooth and the mating surfaces are prevented from being damaged by the foreign matter, and the cooling of the workpiece can be promoted by the refrigerant fluid ejected from between the mating surfaces. .

  The second mold for release may be a part that molds a part to be a product of the work, or may be a part that is trimmed after the work is released.

  In a preferred embodiment, each of the first mold and the second mold molds a part to be a product of the workpiece. This is advantageous for releasing the workpiece by the second mold.

  In a preferred embodiment, an outlet for the refrigerant fluid is opened on the molding surface of the second mold. This is advantageous for cooling the workpiece after press molding.

  Here, when the punch or die is divided into the first mold and the second mold, a refrigerant fluid jet is opened in the vicinity of the divided portion of the molding surface of each of the first mold and the second mold. It becomes difficult. For this reason, the interval between the ejection ports becomes wide at the divided portion, but the workpiece can be cooled by the refrigerant fluid ejected from between the mating surfaces, so that the cooling of the workpiece is prevented from being partially delayed at the divided portion. be able to.

  In a preferred embodiment, the workpiece is a plated steel plate. In the case of a plated steel sheet, when it is directly cooled by a refrigerant fluid, the plating is peeled off and easily enters between the mating surfaces. According to the present invention, the separated plating pieces can be removed from between the mating surfaces by the refrigerant fluid ejected from the mating surfaces.

  In a preferred embodiment, the refrigerant fluid is a liquid refrigerant. When the refrigerant fluid is liquid, it is advantageous for removing foreign substances from between the mating surfaces.

  According to the present invention, at least one of the punch and the die of the hot press working apparatus includes the first mold and the movable second mold for release, and these two molds are combined to form a workpiece. A series of molding surfaces to be molded is configured, and a coolant fluid jet for cooling the workpiece is opened on the molding surface of the first mold, and at least of the mating surfaces of the first mold and the second mold. Since the coolant fluid jet port is open on one side, even if foreign matter enters between the mating surfaces of the first die and the second die, the jet port opened on the mating surface when the press-formed workpiece is cooled. Foreign matter can be removed from between the mating surfaces by the refrigerant fluid ejected from the surface, and the operation of the second mold for releasing can be performed smoothly, and the mating surface can be prevented from being damaged by the foreign materials. Cooling of workpieces is promoted by refrigerant fluid ejected from Rukoto can.

Sectional drawing of the hot press processing apparatus of Embodiment 1. FIG. The perspective view of the punch of the apparatus. The disassembled perspective view which expanded a part of the punch. Sectional drawing which shows the refrigerant | coolant supply system of the punch of the apparatus. Sectional drawing which shows the refrigerant | coolant supply system of die | dye of Embodiment 2. FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its application, or its use.

<Embodiment 1>
In the hot press working apparatus shown in FIG. 1, 1 is a punch and 2 is a die. The punch 1 and the die 2 are provided with molding surfaces 4 and 5 for press-molding the plate-like workpiece 3. The press working apparatus of this example bends a heated work (galvanized steel sheet) 3 with a punch 1 and a die 2 and rapidly cools it (hot press). Thereby, a quenched high-tensile steel press-molded product is obtained.

  The punch 1 is held by a punch holder 6. The die 2 is held in the die holder 8 via the hydraulic cylinder 9 in a state of being incorporated in the outer frame 7. The die holder 8 is attached to a slider that moves up and down in the press machine. The die 2 moves up and down relatively with respect to the die holder 8 by the operation of the hydraulic cylinder 9.

  The punch 1 is connected to first and second refrigerant supply pipes 11 and 12 for supplying a liquid refrigerant for cooling the press-molded work 3. Also connected to the die 2 is a refrigerant supply pipe 13 for supplying a liquid refrigerant for cooling the press-formed workpiece 3. The base ends of the refrigerant supply pipes 11 to 13 are connected to the refrigerant ejection devices 15 to 17. The reason why the two coolant supply systems are provided in the punch 1 is that the punch 1 is constituted by a plurality of molds into which the punch 1 is divided. This point will be specifically described below.

  As shown in FIG. 2, the punch 1 includes a first mold 21 and a second mold 22 for mold release that is movable in the mold release direction (upward) of the work 3 with respect to the first mold 21. Become. The first mold 21 is fixed to the punch holder 6. The second mold 22 is smaller than the first mold 21. In the case of this example, the second mold 22 is provided at three locations, both ends and the center of the first mold 21. The molding surfaces 23 and 24 of each of the first and second molds 21 and 22 are a series of presses for molding a part to be a product of the workpiece 3 when the first mold 21 and the second mold 22 are combined. Configure the molding surface.

  On the molding surfaces 23 and 24 of the first and second molds 21 and 22, a large number of jet outlets 25 for the refrigerant are opened. In each of the first and second molds 21 and 22, there are formed refrigerant flow paths that guide the refrigerant supplied by the first and second refrigerant supply pipes 11 and 12 to the respective jet outlets 25. .

  As shown in FIG. 3, a plurality of refrigerant jets 28 are also opened on the mating surfaces 26 and 27 of the first mold 21 and the second mold 22, respectively, and the refrigerant from the refrigerant flow path is the first and second refrigerants. Are also ejected between the mating surfaces of the molds 21 and 22.

  As shown schematically in FIG. 4, the second mold 22 for mold release is fitted in a recess provided in the first mold 21 so as to be movable up and down. Then, the refrigerant from the first refrigerant supply pipe 11 connected to the first mold 21 is ejected from the molding surface 23 and the mating surface 26 through the refrigerant flow path 31 inside the first mold 21. Similarly, the refrigerant from the second refrigerant supply pipe 12 connected to the second mold 22 is ejected from the molding surface 24 and the mating surface 27 through the refrigerant flow path 32 inside the second mold 22. The second mold 22 is supported on the base 10 by lifting means 33. An air cylinder is suitable as the lifting means 33. The second mold 22 is in a state where the molding surface 24 thereof is flush with the molding surface 23 of the first mold 21 by the operation of the lifting means 33 (the molding surfaces 23 and 24 constitute a series of press molding surfaces. And the molding surface 24 is driven so as to protrude from the molding surface 23 of the first mold 21. FIG. 4 shows a state in which the molding surface 24 of the second mold 22 is flush with the molding surface 23 of the first mold 21.

  Although illustration is omitted, the press-forming surface 34 of the die 2 has many outlets for the refrigerant, and the refrigerant supplied from the refrigerant supply pipe 13 is formed through the refrigerant flow path formed inside the die 2. It is ejected from a spout opening in the surface 5.

-Operation-
As shown in FIG. 1, the heated workpiece 3 is carried between the punch 1 and the die 2 while the die 2 is raised. As the die 2 descends, the workpiece 3 is press-formed by the punch 1 and the die 2. When the workpiece 3 is in a pressed state, the hydraulic cylinder 9 switches from a state where the die 2 is lowered relative to the die holder 8 to a state where the die 2 is raised. Along with this, the die holder 8 is further lowered, so that the workpiece 3 is trimmed before being cooled and hardened by a trim blade (not shown) provided in the die holder 8.

  When the workpiece 3 is in a pressed state, the refrigerant is supplied to the punch 1 and the die 2 through the refrigerant supply pipes 11 to 13 by the operation of the refrigerant jetting devices 15 to 17. As a result, the ejection port 25 opened on the molding surfaces 23 and 24 of the first and second molds 21 and 22 of the punch 1, the ejection port 28 opened on the mating surfaces 26 and 27, and the molding surface 34 of the die 2. Refrigerant is ejected from the opened jet nozzle. As a result, the pressed workpiece 3 is quenched and hardened by the refrigerant (quenching hardening).

  In the portion of the punch 1 that is divided into the first die 21 and the second die 22, the interval between the jet openings that are opened in the press molding surface by the division is wider than the other portions. However, since the coolant is supplied to the work 3 from between the mating surfaces of the first mold 21 and the second mold 22, the work 3 is efficiently cooled even in the divided part, which is advantageous for uniform cooling of the entire work. become. Thus, even if foreign matter is caught between the mating surfaces, the foreign matter is eliminated by the refrigerant jetted between the mating surfaces. Malfunctioning is avoided.

  After press forming and cooling the workpiece 3, the die holder 8 is raised and the second die 22 of the punch 1 is raised by the operation of the elevating means 33. Therefore, even if the workpiece 3 is in the state of biting on the first mold 21, the workpiece 3 is separated from the first mold 21 by the second mold 22 rising relative to the first mold 21. Type.

<Embodiment 2>
This embodiment is a case in which a second mold for mold release is provided on a die.

  As schematically shown in FIG. 5, the die 2 includes a first mold 41 fixed to the outer frame 7, and a separation that is movable in the workpiece release direction (downward) with respect to the first mold 41. It consists of a second mold 42 for the mold. In the case of this example, the second mold 42 is provided at both ends of the first mold 41. The second mold 42 is smaller than the first mold 41. The molding surfaces 43 and 44 for press-molding the workpieces of the first and second molds 41 and 42 form a part to be a product of the workpiece when the first mold 41 and the second mold 42 are combined. Configure a series of press-molded surfaces.

  As with the first and second molds 21 and 22 of the first embodiment, the liquid refrigerant jet 45 is opened on the molding surfaces 43 and 44 of the first and second molds 41 and 42, respectively. . In addition, the refrigerant outlet 48 is also opened on the mating surfaces 46 and 47 of the first and second molds 41 and 42, respectively. Thus, in each of the first and second molds 41 and 42, a refrigerant flow for guiding the refrigerant supplied by the first and second refrigerant supply pipes 13 and 14 to the respective outlets 45 and 48. Paths 49 and 50 are formed. The first and second refrigerant supply pipes 13 and 14 are connected to the refrigerant ejection devices 17 and 18.

  The second mold 42 for mold release is fitted in a recess between the first mold 41 and the outer frame 7 so as to be movable up and down. The refrigerant from the first refrigerant supply pipe 13 connected to the first mold 41 is ejected from the molding surface 43 and the mating surface 46 through the refrigerant flow path 49 inside the first mold 41. Yes. Similarly, the refrigerant from the second refrigerant supply pipe 14 connected to the second mold 42 is ejected from the molding surface 44 and the mating surface 47 through the refrigerant flow path 50 inside the second mold 42. ing. The second mold 42 is supported by the die holder 8 by lifting means (for example, an air cylinder) 53, the molding surface 44 is flush with the molding surface 43 of the first mold 41, and the molding surface 44. Is driven to protrude from the molding surface 43 of the first mold 21. FIG. 5 shows a state in which the second mold 42 is lowered from the first mold 41.

-Operation-
In the state where the die 2 is raised, the second mold 42 is raised, and the molding surfaces 43 and 44 of the first and second molds 41 and 42 are flush with each other. In this state, the work is carried between the punch (not shown) and the die 2. As the die 2 descends, the workpiece is press-formed by the punch and the die 2.

  When the workpiece is in a pressed state, the refrigerant is supplied to the first mold 41 and the second mold 42 via the refrigerant supply pipes 13 and 14 by the operation of the refrigerant ejection devices 17 and 18. Thus, the refrigerant is ejected from the ejection port 45 opened on the molding surfaces 43 and 44 of the first and second molds 41 and 42 and the ejection port 48 opened on the mating surfaces 46 and 47. As a result, the pressed workpiece is quenched and hardened by the refrigerant (quenching hardening).

  In the portion of the die 2 divided into the first die 41 and the second die 42, the interval between the jet openings opened in the press molding surface is wider than the other portions, but the refrigerant is the first and second die. Since the workpiece is supplied from between the mating surfaces 41 and 42, the entire workpiece can be uniformly cooled. Even if foreign matter is caught between the mating surfaces, the foreign matter is eliminated by the refrigerant jetted between the mating surfaces, so that damage to the mating surface and malfunction of the second mold 22 due to the foreign matter biting are avoided. It is done.

  After the press molding and cooling of the workpiece, the die holder 8 is raised, and the second die 42 of the die 2 is lowered and protrudes from the first die 41 by the operation of the lifting means 53. For this reason, even if the workpiece is in a state of biting on the first mold 41, it is released from the first mold 41 by the protrusion of the second mold 42.

<Others>
In Embodiments 1 and 2, the refrigerant outlet is provided on the mating surface of each of the first mold and the second mold. However, the refrigerant jet is provided only on one of the mating surfaces of the first mold and the second mold. You may make it provide.

  A second mold for release may be provided on either one of the punch and the die, or a second mold for release may be provided on both the punch and the die.

DESCRIPTION OF SYMBOLS 1 Punch 2 Die 3 Workpiece 21 1st metal mold | die 22 2nd metal mold | die 23,24 Molding surface 25 Spout 26,27 Mating surface 28 Spout

Claims (5)

A hot press working device that performs press forming and cooling of a heated metal workpiece by a punch and a die,
At least one of the punch and die includes a first mold and a second mold for mold release that is movable in the mold release direction of the workpiece with respect to the first mold,
A series of molding surfaces for molding the workpiece is configured by combining the first mold and the second mold,
A coolant fluid jet opening for cooling the workpiece is opened on the molding surface of the first mold, and the coolant fluid is jetted onto at least one of the mating surfaces of the first mold and the second mold. A hot press working apparatus characterized in that an outlet is opened. In claim 1,
A hot press working apparatus, wherein each of the first mold and the second mold molds a part to be a product of the workpiece. In claim 2,
A hot press working apparatus, wherein a jet port of the refrigerant fluid is opened on a molding surface of the second mold. In any one of Claim 1 thru | or 3,
A hot press working apparatus, wherein the workpiece is a plated steel sheet. In any one of Claims 1 thru | or 4,
A hot press working apparatus, wherein the refrigerant fluid is a liquid refrigerant.

Images