JP2021087986A - Lubricant supply device, molding apparatus including lubricant supply device, and molding method using the same - Google Patents

Abstract

To propose a lubricant application device capable of molding a bottomed container shape body which has high dimensional accuracy and is superior in smoothness, according to an impact molding method, and to propose a molding apparatus including the lubricant supply device, and a molding method using the molding apparatus.SOLUTION: There are provided a lubricant supply device, a press working apparatus for a bottomed container shape body, including the lubricant supply device, and a press working method. The lubricant supply device comprises: molded material placing and transporting means 3 for transporting a material 13 to be molded to a die cavity 2 of a molding die 1, and placing the material therein; lubricant supply means for controlling a lubricant supply mechanism which drops a lubricant 16 on a top face central part only of the placed material to be molded, and for controlling a supply amount of the lubricant; and die cavity cleaning means provided with an air nozzle for cleaning the die cavity after molding. The lubricant supply means can control fluidity of the material to be molded that is supplied in a pressing direction of a punch and in an opposite direction thereof at the time of impact molding. A relationship between a friction coefficient (μD) of the die and a friction coefficient (μP) of the punch satisfies μD≥2×μP.SELECTED DRAWING: Figure 4

Description

In the present invention, in order to form a bottomed container shape with high accuracy by impact molding, lubrication for supplying a lubricant only to a plate-shaped molded material (slab) placed in a die cavity of a molding die. The present invention relates to an agent supply device, a molding processing device having the lubricant supply device, and a molding processing method using the same.

In the impact molding method, a plate-shaped material (slab) is impacted with a punch, and the slab extends along the punch to form a bottomed container shape in one process. This is an extrusion forging method. The bottomed container shape formed by the impact molding method is widely used in CPU cases, lithium-ion battery cases, in-vehicle light covers, cone-integrated speakers, and the like.
In recent years, the number of clearance sonars mounted on the vehicle has increased as one of the key devices for realizing an automatic driving / automatic parking system toward the practical use of automatic traveling vehicles, and the market for clearance sonars is expected to expand rapidly. ..
Piezoelectric ceramics, sound absorbing materials, dampers, etc. that make up the clearance sonar are housed in a metal sonar case. The sonar case is a bottomed container shape having a complicated shape with different wall thicknesses, and the bottom of the container on which the piezoelectric ceramic is placed is required to have dimensional accuracy, smoothness, and material strength of 0.01 mm or less.
Further, in the impact forming method, it is important to control the supply amount of the slag material supplied from the bottom side to the side wall portion side in the direction opposite to the pressing direction of the punch by pressing the punch. In order to control the supply amount of such slag material, it is necessary to appropriately control the friction coefficient between the die and the punch during impact molding, and the supply of a highly accurate lubricant to the impact molding die for controlling the friction coefficient. Means are needed.

Patent Document 1 describes punching by spraying a lubricant from a spray nozzle having a spray angle in which the spray pressure is adjusted in advance so that the lubricant does not adhere to the inner peripheral surface of the molding hole, and applying the lubricant. Disclosed is a method for manufacturing a forged molded product, which suppresses the adhesion of a lubricant to the molded surface of the molded product, and suppresses the occurrence of defects such as driving and sagging of the lubricant.

Patent Document 2 describes a case where a work (material to be molded) is preheated and then a water-based lubricant is sprayed onto the work and dried to form a lubricant film, whereby the work is cold forged. A cold forging method for avoiding seizure and lack of meat is disclosed.

In Patent Document 3, the processing oil sprayed by the spray coating means is uniformly applied to the material to be drawn, and the processing oil sprayed by the guide means is uniformly applied to avoid seizure and thinning. A processing oil coating device for processing and a press processing device having this coating device are disclosed.

Japanese Unexamined Patent Publication No. 2004-114140 JP-A-2009-190052 Japanese Unexamined Patent Publication No. 2004-314106

According to the present invention, a lubricating oil formed on the punch and die surface of an impact molding die by supplying a lubricant only to the center of the upper surface of the material to be molded (slab) placed in the die cavity of the molding die. A lubricant coating device capable of controlling a coating thickness to form a bottomed container shape having high dimensional accuracy and excellent smoothness by an impact molding method, a molding processing device having this lubricant supply device, and molding processing using the lubricant coating device. To propose a method.

The problem of the present invention can be solved by the following aspects. In particular,

(Aspect 1) A material to be molded material mounting and transporting means provided with a mechanism for holding the material to be molded for transporting and mounting the material to be molded into the die cavity of the molding die, and a die cavity of the molding die. A lubricant supply means having a lubricant supply mechanism for dropping a lubricant only on the center of the upper surface of the material to be molded placed on the surface and a supply control mechanism for controlling the supply amount of the lubricant, and a die cavity after molding. It is a lubricant supply device including a die cavity purification means provided with a die cavity purification jig provided with an air nozzle for purifying the above.
By a lubricant supply means provided with a lubricant supply mechanism for dropping the lubricant only on the center of the upper surface of the material to be molded placed in the die cavity of the molding die and a supply control mechanism for controlling the supply amount of the lubricant. It is possible to control the fluidity of the material to be molded, which is supplied in the direction opposite to the pressing direction of the punch during impact molding. This is because the filling of the material to be molded is sufficiently performed at the intersection between the side wall and the bottom surface of the container, and the thinning at the intersection between the side wall and the bottom surface of the container is not generated.

(Aspect 2) A die having a cavity having a predetermined shape for mounting a material to be molded and a die placed facing the die and colliding with the material to be molded placed in the cavity. A molding die having a punch for plastically deforming the material to be molded, and a material to be molded having a holding mechanism for transporting the material to be molded into the die cavity of the molding die and mounting the material to be molded. Lubrication including a transport means, a lubricant supply mechanism that drops a lubricant only on the center of the upper surface of the material to be molded placed in the die cavity of the molding die, and a supply control mechanism that controls the supply amount of the lubricant. Bottomed container shape provided with a agent supply means, a die cavity purification means provided with a die cavity purification jig provided with an air nozzle for purifying the die cavity after molding, and a lubricant supply device including the agent supply device. It is a body press processing device.
By providing a mechanism for braking the impact molding die and a lubricant coating device, it is configured as an impact molding device for a bottomed container shape.

(Aspect 3) The bottomed container shape according to (Aspect 2), wherein the relationship between the friction coefficient (μD) of the die and the friction coefficient (μP) of the punch during molding is μD ≧ 2 × μP. Press processing equipment.
By making the frictional force on the die surface of the material to be molded larger than the frictional force on the punch surface, the fluidity of the material to be molded on the die side is suppressed compared to the punch side, and the direction is opposite to the pressing direction of the punch during impact molding. The fluidity of the supplied material to be molded can be controlled. This is because the filling of the material to be molded is sufficiently performed at the intersection between the side wall and the bottom surface of the container, and the thinning at the intersection between the side wall and the bottom surface of the container is not generated.
In addition, the fluidity of the material to be molded on the die side is suppressed as compared with that on the punch side. This is because the filling of the material to be molded is sufficiently performed at the intersection between the side wall and the bottom surface of the container, and the thinning at the intersection between the side wall and the bottom surface of the container is not generated.

(Aspect 4) A step of placing a material to be molded on a die having a cavity having a predetermined shape, a step of supplying a lubricant by dropping a lubricant only on the center of the upper surface of the mounted material to be molded. A molding process in which a material to be molded to which a lubricant is dropped is made to collide with a punch arranged so as to face a die to plastically deform the material to be molded into a bottomed container shape, the bottomed container shape. This is a stamping method for a bottomed container shape, which comprises a process of taking out a processed product from the die cavity and a process of purifying the die cavity with a purification jig provided with an air nozzle.
In the molding process, a lubricant supply process in which a lubricant is dropped only on the center of the upper surface of the placed material to be molded, and a punch in which the lubricant is dropped is made to collide with a punch arranged facing the die. This makes it possible to control the fluidity of the material to be molded, which is supplied in the direction opposite to the pressing direction of the punch during impact molding when the material to be molded is plastically deformed to form a bottomed container shape. As a result, the intersection of the side wall of the container and the bottom surface is sufficiently filled by supplying the material to be molded, and no thinning occurs at the intersection of the side wall of the container and the bottom surface, the dimensional accuracy is high, and the bottom surface is smooth. This is because it is possible to provide an excellent press working method for a bottomed container shape.

(Aspect 5) In the lubricant supply step, a lubricant supply mechanism for dropping the lubricant only in the central portion of the work material placed in the die of the molding die and a supply for controlling the supply amount of the lubricant are controlled. The bottomed container according to (Aspect 4), wherein the relationship between the friction coefficient (μD) of the die and the friction coefficient (μP) of the punch is μD ≧ 2 × μP by the lubricant supply means including the control mechanism. This is a press working method for a shape.
By making the frictional force on the die surface of the material to be molded larger than the frictional force on the punch surface, the fluidity of the material to be molded on the die side is suppressed compared to the punch side, and the direction is opposite to the pressing direction of the punch during impact molding. The fluidity of the supplied material to be molded can be controlled. This is because the filling of the material to be molded is sufficiently performed at the intersection between the side wall and the bottom surface of the container, and the thinning at the intersection between the side wall and the bottom surface of the container is not generated.
In addition, the fluidity of the material to be molded on the die side is suppressed as compared with that on the punch side. This is because the filling of the material to be molded is sufficiently performed at the intersection between the side wall and the bottom surface of the container, and the thinning at the intersection between the side wall and the bottom surface of the container is not generated.

In the present invention, the thickness of the lubricating oil film formed on the punch and die surface of the impact molding die by supplying the lubricant only to the center of the upper surface of the material to be molded placed in the die cavity of the molding die. Can be controlled so that the punch surface is thicker. As a result, the friction coefficient (μD) of the die of the impact forming die can be made larger than the friction coefficient (μP) of the punch, and the fluidity of the material to be molded, which is supplied in the direction opposite to the pressing direction of the punch during impact forming, is controlled. be able to. Therefore, the bottomed container shape is sufficiently filled by supplying the material to be molded to the intersection between the side wall of the thick portion of the container and the bottom surface, and the filling is sufficiently performed at the intersection of the side wall of the thick portion of the container and the bottom surface. It will not occur.
According to the present invention, a bottomed container shape having high dimensional accuracy and excellent smoothness, which is difficult to impact molding, can be processed by the impact molding method.

It is a plane schematic diagram which shows 1 mode of arrangement of the component of the lubricant supply device of this invention. It is a side view which shows 1 mode of the material to be molded material placing transfer means which includes the holding mechanism of the material to be molded material in the lubricant supply device of this invention. It is a schematic diagram which shows 1 mode which put the material to be molded in the die cavity in the lubricant supply device of this invention. It is a schematic diagram which shows 1 mode which drops the lubricant on the central part of the upper surface of the material to be molded placed in the die cavity in the lubricant supply device of this invention. It is a schematic diagram which shows 1 mode of the dispenser pump which controls the lubricant supply amount and supply time in the lubricant supply device of this invention. It is a schematic diagram which shows 1 aspect of the purification means provided with the air nozzle for purification of a die cavity in the lubricant supply device of this invention. It is a schematic diagram which shows 1 mode of purification of the die cavity by the purification means in the lubricant supply device of this invention. It is a schematic diagram which shows 1 mode of the molding process in the press processing apparatus provided with the lubricant supply apparatus of this invention. It is a photograph which shows the side surface appearance of the molded product by the press processing apparatus provided with the lubricant supply apparatus of this invention.

In the lubricant supply device of the present invention, in order to appropriately control the friction coefficient between the die and the punch during impact molding, the lubricant is dropped and supplied only to the material to be molded placed in the die cavity of the impact molding mold. It realizes a highly accurate lubricant supply means. This makes it possible to appropriately control the supply amount of the slag material supplied from the bottom side to the side wall portion side in the direction opposite to the pressing direction of the punch by pressing the punch in the impact forming method.
The lubricant supply device of the present invention will be described with reference to FIGS. 1 to 7. It should be noted that FIGS. 1 to 7 show an embodiment of the present invention, and the present invention is not limited to the embodiment.

FIG. 1 is a schematic plan view showing one aspect of arrangement of components of the lubricant supply device of the present invention. The lubricant supply device of the present invention includes (1) a means for placing and transporting a material to be molded having a holding mechanism for a material to be molded, and (2) a subject mounted in a die cavity of a molding die, which will be described in detail below. Lubricant supply means including a lubricant supply mechanism for dropping a lubricant only in the center of the upper surface of the molding material and a supply control mechanism for controlling the supply amount and supply time of the lubricant, (3) of the die cavity after molding. It is composed of a die cavity purification means provided with a die cavity purification jig provided with an air nozzle for purification.

The material to be molded material placing and transporting means is composed of a material to be molded material holding jig 5 attached to an arm 3 for transporting the material to be molded and the like, and the die cavity 2 of the die 1 is moved by the movement of the arm 3 for transporting the material to be molded and the like. The material 13 to be molded is conveyed and placed on the surface.
The lubricant supply means is composed of a lubricant supply mechanism and a supply amount control mechanism. Specifically, a lubricant supply mechanism that drops the lubricant only on the center of the upper surface of the material to be molded 13 placed in the die cavity 2 of the die 1 is attached to the arm 3 for transporting the material to be molded or the like. It is composed of a needle adapter 4 for dropping a lubricant, a dispenser pump 7, and a lubricant pipe 6. Further, the supply control mechanism for controlling the supply amount of the lubricant is composed of a control device.
The die cavity purification means is composed of a die cavity purification jig 9 provided with an air nozzle attached to the die cavity transfer arm 8. The die cavity purifying jig 9 provided with an air nozzle in the die cavity 2 of the die 1 is moved by the die cavity transport arm 8 to purify the die cavity 2 by air pressure.

(1) Material Loading and Transporting Means FIG. 2 is a side view showing one aspect of a material loading and transporting means to be molded, which includes a holding mechanism for the material to be molded in the lubricant supply device of the present invention. The material holder 5 to be molded has a suction pad 12 and a joint 11 for sucking and holding the material 13 to be molded. The joint 11 has a role of connecting to an air pipe (not shown) for attaching and detaching the material to be molded 13.
FIG. 3 is a schematic view showing one aspect in which the material to be molded is placed in the die cavity in the lubricant supply device of the present invention. The material 13 to be molded is placed in the die cavity 2 of the die 1 by moving the arm 3 for transporting the material to be molded or the like to which the material holder 5 to be molded is attached.

(2) Lubricant Supply Mechanism and Supply Control Mechanism FIG. 4 is a schematic view showing one embodiment in which a lubricant is dropped onto the center of the upper surface of a material to be molded placed in a die cavity in the lubricant supply device of the present invention. FIG. 5 is a schematic view showing one aspect of a dispenser pump and a control device that controls a lubricant supply amount and a supply time in the lubricant supply device of the present invention.
One of the features of the present invention is a lubricant supply mechanism for dropping a lubricant only on the center of the upper surface of the material to be molded 13 placed in the die cavity 2 of the molding die, and a lubricant supply amount and supply time. It is in the lubricant supply means including the supply control mechanism for controlling the above.

In the lubricant supply mechanism of the present invention, the dispenser pump 7 that supplies a small amount of lubricant to the lubricant dropping precision needle 14 and the lubricant dropping precision needle 14 with high accuracy plays an important role. The dispenser pump 7 supplies a high-precision lubricant by a plunger method, and the dispenser pump drive unit 18 is pneumatically driven by air supplied from the drive pump connection terminal 22 of the control device 10 and has a wide flow path. A small amount of lubricant is supplied from the lubricant supply nozzle 21 with high accuracy by combining the needle valve 19 and the weighing plunger 20 which has a short path structure with a small dead space and whose stroke is set by the macrometer 17 for adjusting the supply amount. .. The lubricant supplied from the lubricant supply nozzle 21 with high accuracy is supplied to the precision needle 14 for dropping the lubricant through the lubricant pipe 6 via the dispenser pump joint 15. The inner diameter and length of the precision needle 14 for dropping the lubricant are appropriately designed so that the lubricant can be dropped accurately on the center of the upper surface of the material 13 to be molded. The lubricant supply control mechanism of the present invention also controls the position of the lubricant dripping precision needle 14 by setting the operation switch 23 of the control device 10 and the sequencer 24.

(3) Die Cavity Purifying Means FIG. 6 is a schematic view showing one aspect of a purifying means including an air nozzle for purifying a die cavity in the lubricant supply device of the present invention, and FIG. 7 is a schematic view showing one aspect of the lubricating means of the present invention. It is a schematic diagram which shows 1 mode of purification of the die cavity by the purification means in a supply device.
The die cavity purification means of the present invention is a die cavity purification jig 9 provided with an air nozzle. The die cavity purification jig 9 provided with the air nozzle supplies air from the air supply port 25, and ejects air while rotating from the air discharge port provided on the side surface. The lubricant and metal powder remaining on the tee 2 can be completely removed.

(4) Pressing die and coefficient of friction FIG. 8 is a schematic view showing one aspect of molding processing in a press processing apparatus provided with the lubricant supply apparatus of the present invention. The molding die 27 of the press working apparatus is composed of a die 1 and a punch 28. FIG. 8A is a schematic view showing an aspect immediately before molding the material 13 to be molded placed on the die 1 with the punch 28. The lubricant 16 is dropped on the central portion of the upper surface of the material 13 to be molded by the lubricant supply device of the present invention. FIG. 8B is a schematic view showing an aspect immediately after the material 13 to be molded placed on the die 1 is molded into the bottomed container shape 30 by the punch 28. By the lubricant supply means provided with the lubricant supply mechanism and the supply control mechanism of the present invention, the lubricant is dropped only on the center of the upper surface of the material to be molded 13 placed in the die cavity 2 with high accuracy to punch. The lubricant film 29 can be formed only on the surface of 28.

In the molding die 27 in the press working apparatus including the lubricant supply apparatus of the present invention, the relationship between the friction coefficient (μD) of the die 1 and the friction coefficient (μP) of the punch 28 is μD ≧ 2 × μP. By forming the lubricant film 29 only on the surface of the punch 28, the relationship of the friction coefficient between the die 1 and the punch 28 (μD ≧ 2 × μP) is realized. Specifically, the friction coefficient (μD) of the die 1 is 0.35 to 0.45, and the friction coefficient (μP) of the punch 28 is 0.05 to 0.07. In order to maintain the relationship of the friction coefficient, the amount of the lubricant dropped is preferably 1.00 μl to 4.00 μl.
By maintaining the relationship of the friction coefficient, the frictional resistance of the contact surface with the die 1 becomes larger than the frictional resistance of the contact surface with the punch 28 even in the side wall portion of the bottomed container shaped body 30, and the frictional resistance of the contact surface with the punch 28 becomes larger. The fluidity of the material 13 to be molded is relatively suppressed, and the material 13 to be molded is filled at the intersection of the side wall and the bottom surface of the bottomed container shape 30 to eliminate the lack of meat.

FIG. 9 is a photograph showing a side surface appearance of a molded product by a press working apparatus including the lubricant supply apparatus of the present invention. (A) is the appearance of the side surface of the bottomed container shape in which the lubricant is dropped on the center of the upper surface of the material 13 to be molded, and (b) is the appearance of the lubricant dropped from the center of the upper surface of the material 13 to be molded. Bottom container shape This is the appearance of the side surface of the body. This is because if the lubricant is not accurately dropped on the center of the upper part of the material 13 to be molded, the thickness of the lubricant coating 29 on the surface of the punch 28 will be uneven and the fluidity of the material 13 to be molded will be different.

The coefficient of friction was measured by a rotating ball-on-disk type friction test device (TRB18-289 manufactured by Nanotech) under the following conditions.
<Measurement conditions>
Aluminum ball (A5052 6mmφ) Load 10N
Sliding speed 10 cm / s
Sliding circle diameter 14 mm
Test distance 0.4m
Test temperature Room temperature Test piece Disc-shaped mold material (diameter 24.9 mm, thickness 10 mm)

(5) Lubricant The lubricant used to set the friction coefficient (μP) of the punch of the present invention within a predetermined range is not particularly limited, but from the viewpoint of precisely controlling the friction coefficient and excellent rust prevention. Therefore, a low-viscosity non-chlorine press oil is preferably used.

(6) Material to be alloyed The material 13 to be alloyed used for molding the bottomed container shape 30 of the present invention is to obtain the mechanical strength required for the bottomed container shape 30 and a high weight reduction effect. Aluminum alloys such as 5000 series (Al-Mg based alloy), 6000 series (Al-Si-Mg based alloy), and 7000 series (Al-Zn-Mg-Cu based alloy) are preferably adopted.

(7) Method of Pressing the Bottomed Container Shape The method of pressing the bottomed container shape of the present invention is to place the material to be molded 13 on a die 1 having a cavity 2 having a predetermined shape. Process, a lubricant supply process in which the lubricant 16 is dropped only on the central portion of the placed material 13 to be molded, and a punch 28 in which the material to be molded to which the lubricant 16 is dropped collides with a punch 28 arranged to face the die 1. A molding process for plastically deforming the material 13 to be molded, a process for taking out the bottomed container shape 30 obtained by molding the material to be molded from the die 1, and a die cavity purification jig 9 provided with an air nozzle. It consists of a purification step of purifying the die cavity 2 by means of.

The material to be molded step is a step of sucking the material to be molded 13 onto the suction pad 12 of the material holder 5 to be molded attached to the transfer arm 3 for the material to be molded and placing it in the die cavity 2 of the die 1. is there. In this step, the material to be molded transfer arm 3 stops at the upper part of the die cavity 2, descends to a specified depth while holding the material to be molded 13, releases the adsorption, and is the material to be molded at the lowermost part of the die cavity 2. 13 is placed.
In the lubricant supply step, the precision needle 14 for dropping the lubricant attached to the transfer arm 3 for the material to be molded or the like stops at the central portion of the material 13 to be molded placed at the lowermost part of the die cavity 2. Next, the dispenser pump 7 is driven to drop a predetermined amount of lubricant from the precision needle 14 for dropping the lubricant for a predetermined time onto the central portion of the upper surface of the material 13 to be molded.
The molding process is a step of colliding the punches 28 arranged to face the die 1 to plastically deform the material 13 to be molded to form the bottomed container shaped body 30. In this step, the relationship between the friction coefficient (μD) of the die 1 and the friction coefficient (μP) of the punch 28 is μD ≧ 2 × μP. By dropping the lubricant 16 only on the center of the upper surface of the member 13 to be molded in the lubricant supply step, the lubricant film 29 is formed only on the surface of the punch 28, so that the coefficient of friction between the die 1 and the punch 28 is increased. The relationship (μD ≧ 2 × μP) is realized.

The processed product taking-out step is a step of taking out the molded bottomed container shaped body 30 from the die cavity 2. If there is a bottomed container shape 30 formed in the die cavity 2 by a sensor (not shown) installed on the upper part of the die cavity 2, the bottomed container shape 30 is discharged by air.
In the purification step, the die cavity transfer arm 8 equipped with the die cavity purification jig 9 provided with the rotating air nozzle moves to the center of the die cavity 2 of the mold die 1, and the die cavity purification jig 9 moves. It descends and the rotating air nozzle stops in the die cavity 2. Next, air is injected from the air discharge port 26 while the air nozzle is rotated by the air pressure introduced from the air supply port 25. The discharge port 26 is arranged so as to be inclined, and air is uniformly injected into the die cavity 2. As a result, the lubricant and metal powder remaining in the die cavity 2 can be completely removed. By eliminating the remaining lubricant, the coefficient of friction of the die cavity 2 becomes high.

Next, an embodiment in which the effect of the present invention is exhibited will be shown as an example. The test results are shown in Table 1.

<Example>
The bottomed container shape was cold forged under the following conditions using the die shown in FIG. After cold forging, purification treatment was performed with a rotating air nozzle. In Examples 1-4, the amount of the lubricant dropped was changed from 1.00 to 4.00.
<Processing conditions>
Material to be molded 5000 series (Al-Mg series) Aluminum alloy Punch material Carbide VG86 DLC coating Punch rotation speed 50 spm
Punch Lubricant Aqua Chemistry (CX-10)
Lubricant dropping amount 1.00 μl, 1.75 μl, 2.50 μl, 4.00 μl,
Punch Temperature Room Temperature Die Material Carbide VG86 DLC Coating Die Temperature Room Temperature Die No Lubrication

<Evaluation of processed products>
The appearance of the side surface of the prototype bottomed container shape was observed with a stereomicroscope to confirm the uniformity of the left and right sides. In each of Examples 1-4, there was no difference in the fluidity of the material to be formed on both the left and right sides as in FIG. 9A. The judgment was "○".

<Comparative example 1>
The bottomed container shape was cold forged in the same manner as in Examples except that the amount of the lubricant (Aqua Chemical CX-10) dropped was 0.09 μl. The same evaluation as in the examples was performed. Similar to FIG. 9B, there was a difference in the fluidity of the material to be formed on both the left and right sides. The judgment was "x".

<Comparative example 2>
The bottomed container shape was cold forged in the same manner as in Examples except that the amount of the lubricant (Aqua Chemical CX-10) dropped was 4.10 μl. The same evaluation as in the examples was performed. Similar to FIG. 9B, there was a difference in the fluidity of the material to be formed on both the left and right sides. The judgment was "x".

<Comparative example 3>
The cold forging was performed under the same conditions as in Example 2 except that the purification treatment by the rotating air nozzle was not performed after the cold forging. Similar to FIG. 9B, there was a difference in the fluidity of the material to be formed on both the left and right sides. The judgment was "x".

According to the present invention, it is possible to provide a bottomed container shape having high dimensional accuracy and excellent smoothness.

1 Die 2 Die cavity 3 Arm for transporting material to be molded 4 Needle adapter for dropping lubricant 5 Lubricant holding jig 6 Lubricant piping 7 Dispenser pump 8 Arm for transporting die cavity 9 Die cavity with air nozzle Purification jig 10 Control device 11 Joint 12 Suction pad 13 Material to be molded 14 Precision needle for dripping lubricant 15 Joint for dispenser pump 16 Lubricant 17 Micrometer for adjusting supply flow rate 18 Dispenser pump drive unit 19 Needle valve 20 Measuring plunger 21 Lubricant Agent supply nozzle 22 Drive pump connection terminal 23 Operation switch 24 Sequencer 25 Air supply port 26 Air discharge port 27 Molding mold 28 Punch 29 Punch lubricant coating 30 Bottomed container shape

(Aspect 1) A material to be molded material mounting and transporting means provided with a mechanism for holding the material to be molded for transporting and mounting the material to be molded into the die cavity of the molding die, and a die cavity of the molding die. A lubricant supply mechanism consisting of a precision needle for dropping a lubricant whose position is controlled to drop the lubricant only on the center of the upper surface of the material to be molded placed on the machine, and a plunger method for controlling the supply amount of the lubricant. Lubricant supply consisting of a lubricant supply means including a supply control mechanism including a dispenser pump and a die cavity purification means including a die cavity purification jig provided with an air nozzle for purifying the die cavity after molding. It is a device.
Lubricant supply mechanism consisting of precision needles for dropping lubricant and supply of lubricant whose position is controlled to drop lubricant only on the center of the upper surface of the material to be molded placed in the die cavity of the molding mold. A lubricant supply means equipped with a supply control mechanism consisting of a plunger-type dispenser pump that controls the amount allows a small amount of lubricant to be dropped with high accuracy only on the center of the upper surface of the material to be molded, and the punch pressing direction during impact molding. The fluidity of the material to be molded, which is supplied in the opposite direction to the above, can be controlled. This is because the filling of the material to be molded is sufficiently performed at the intersection between the side wall and the bottom surface of the container, and the thinning at the intersection between the side wall and the bottom surface of the container is not generated.

(Aspect 2) A die having a cavity having a predetermined shape for placing a material to be molded and a die arranged so as to face the die and colliding with the material to be molded placed in the cavity. A molding die having a punch for plastically deforming the material to be molded, and a mounting mechanism for the material to be molded, which is provided for transporting the material to be molded into the die cavity of the molding die and mounting the material to be molded. A lubricant supply mechanism consisting of a transport means and a precision needle for dropping the lubricant whose position is controlled to drop the lubricant only on the center of the upper surface of the material to be molded placed in the die cavity of the molding die. It is equipped with a lubricant supply means equipped with a supply control mechanism consisting of a plunger type dispenser pump for controlling the supply amount of the lubricant, and a die cavity purification jig provided with an air nozzle for purifying the die cavity after molding. It is a press working device for a bottomed container shape provided with a die cavity purifying means and a lubricant supply device including the die cavity purifying means.
By providing a mechanism for braking the impact molding die and a lubricant coating device, it is configured as an impact molding device for a bottomed container shape.

(Aspect 4) A step of placing a material to be molded on a die having a cavity having a predetermined shape, and position control for dropping a lubricant only on the center of the upper surface of the placed material to be molded. Lubricant supply process including a lubricant supply mechanism consisting of precision needles for dropping lubricant and a supply control mechanism consisting of a plunger-type dispenser pump that controls the amount of lubricant supplied. A molding process in which a material to be molded is plastically deformed to form a bottomed container shape by colliding punches arranged facing the die, and a processed product is taken out from the die cavity. This is a press working method for a bottomed container shape, which comprises a process and a purification process for purifying a die cavity with a purification jig provided with an air nozzle.
In the molding process, the lubricant supply mechanism consisting of the precision needle for dropping the lubricant and the supply amount of the lubricant are controlled so that the lubricant is dropped only on the center of the upper surface of the material to be molded. In a lubricant supply process equipped with a supply control mechanism consisting of a plunger type dispenser pump , the material to be molded is plastically deformed by colliding the material to be molded with the lubricant dropped against the die. When molding into a bottomed container shape, the fluidity of the material to be molded, which is supplied in the direction opposite to the pressing direction of the punch during impact molding, can be controlled. As a result, the intersection of the side wall of the container and the bottom surface is sufficiently filled by supplying the material to be molded, and no thinning occurs at the intersection of the side wall of the container and the bottom surface, the dimensional accuracy is high, and the bottom surface is smooth. This is because it is possible to provide an excellent press working method for a bottomed container shape.

(Aspect 5) The lubricant supply step is lubrication consisting of a precision needle for dropping a lubricant whose position is controlled so that the lubricant is dropped only on the central portion of the work material placed in the die of the molding mold. The friction coefficient (μD) of the die and the friction coefficient (μP) of the punch are set by a lubricant supply means including a supply control mechanism including a agent supply mechanism and a plunger type dispenser pump that controls the supply amount of the lubricant. The method for pressing a bottomed container shape according to (Aspect 4), wherein the relationship is controlled so that μD ≧ 2 × μP.
By making the frictional force on the die surface of the material to be molded larger than the frictional force on the punch surface, the fluidity of the material to be molded on the die side is suppressed compared to the punch side, and the direction is opposite to the pressing direction of the punch during impact molding. The fluidity of the supplied material to be molded can be controlled. This is because the filling of the material to be molded is sufficiently performed at the intersection between the side wall and the bottom surface of the container, and the thinning at the intersection between the side wall and the bottom surface of the container is not generated.
In addition, the fluidity of the material to be molded on the die side is suppressed as compared with that on the punch side. This is because the filling of the material to be molded is sufficiently performed at the intersection between the side wall and the bottom surface of the container, and the thinning at the intersection between the side wall and the bottom surface of the container is not generated.

Claims (5)

A material to be molded material mounting and transporting means provided with a holding mechanism for the material to be molded for transporting and mounting the material to be molded into the die cavity of the molding die.
A lubricant supply means having a lubricant supply mechanism for dropping a lubricant only on the center of the upper surface of a material to be molded placed in a die cavity of a molding die and a supply control mechanism for controlling the supply amount of the lubricant. ,
A die cavity purification means equipped with a die cavity purification jig provided with an air nozzle for purifying the die cavity after molding, and a die cavity purification means.
Lubricant supply device consisting of. The material to be molded is placed by colliding with a die having a cavity having a predetermined shape for placing the material to be molded and the material to be molded which is arranged to face the die and is placed in the cavity. A molding die consisting of punches that are plastically deformed,
The material to be molded is placed in the die cavity of the mold to be molded and the material to be molded is placed in the die cavity of the mold to be molded and the material to be molded is placed in the die cavity of the mold to be molded. A lubricant supply means equipped with a lubricant supply mechanism for dropping the lubricant only on the center of the upper surface of the material to be molded and a supply control mechanism for controlling the supply amount of the lubricant, and purification of the die cavity after molding. A lubricant supply device consisting of a die cavity purification means provided with a die cavity purification jig provided with an air nozzle, and a lubricant supply device consisting of the die cavity purification means.
A press working device for a bottomed container shape provided with. The press working apparatus for a bottomed container shape according to claim 2, wherein the relationship between the friction coefficient (μD) of the die and the friction coefficient (μP) of the punch at the time of molding is μD ≧ 2 × μP. A process of placing a material to be molded on a die having a cavity having a predetermined shape,
Lubricant supply process in which the lubricant is dropped only on the center of the upper surface of the placed material to be molded.
A molding process that plastically deforms the material to be molded into a bottomed container shape by colliding the material to be molded with the lubricant dropped against the die.
Processed product removal process for removing the bottomed container shape from the die cavity,
Purification process that purifies the die cavity with a purification jig equipped with an air nozzle,
A method of pressing a bottomed container shape consisting of. The lubricant supply step includes a lubricant supply mechanism that drops the lubricant only in the central portion of the work material placed in the die of the molding mold, and a supply control mechanism that controls the supply amount of the lubricant. The bottomed container shape according to claim 4, wherein the relationship between the friction coefficient (μD) of the die and the friction coefficient (μP) of the punch is μD ≧ 2 × μP by the lubricant supply means. Method.

Images