JP2004276082A - Forming apparatus and method for controlling forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To raise the efficiency of forming by efficiently transmitting the driving power of drive sources to a forming die. <P>SOLUTION: This apparatus is provided with the forming die 15 comprising a lower die 20 and an upper die 16 which are provided so that the dies can be relatively clamped and opened and the drive sources 8 for driving the lower die 20 and the upper die 16. The drive source 8 is composed of a linear motor 8 which comprises a stator 9 and movers 10, 11, the stator 9 is attached on the inside of each strut of the body 2, the movers 10, 11 are respectively attached in both end parts of movable boards 5, 6 which are provided to be freely driven in the vertical direction between both struts 4, 4, the upper die 16 is mounted to the movable board 5 and the lower die 20 is fixed to the movable board 6. The upper die 16 and the lower die 20 are driven integrally with the movable boards 5, 6 in the directions of die clamping and die opening by driving the mover 10, 11 relatively to the stator 9. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a molding apparatus and a method of controlling the molding apparatus, and particularly relates to a molding die including a lower die and an upper die which are relatively openably provided with a mold clamping die, and a lower die and an upper die of the molding die. The present invention relates to a molding apparatus having a driving source to be driven and a method of controlling the molding apparatus.
[0002]
[Prior art]
As an example of this type of molding apparatus, a pair of upper and lower parts including a rotatable ball screw, a servomotor that drives the ball screw to rotate, and a nut that is screwed to the ball screw and moves up and down following the rotation of the ball screw are used. The moving mechanism is provided facing the vertical direction, the upper punch of the molding die is attached to the tip of the nut of the upper vertical moving mechanism, and the lower end of the molding die is attached to the tip of the nut of the lower vertical moving mechanism. There is known a powder molding apparatus in which a punch is attached, an upper punch can be inserted from above into a through hole of a die of a molding die located between both vertical movement mechanisms, and a lower punch can be inserted from below (for example, a powder molding apparatus). And Patent Document 1.).
[0003]
Then, by operating the vertical movement mechanism on the lower side of the molding device having such a configuration, the lower punch is fitted into the through hole of the die from below to a predetermined position, and in this state, powdery molding is performed in the through hole. Filling the material, operating the upper vertical movement mechanism to insert the upper punch into the through hole of the die from above, and compression molding the molding material between the die, the lower punch and the upper punch to obtain a predetermined shape Is molded.
[0004]
[Patent Document 1]
JP-A-5-57497 [0005]
[Problems to be solved by the invention]
By the way, in the molding apparatus having the above configuration, power is transmitted by mechanically contacting the ball screw and the nut portion via the backlash, so that noise is generated when transmitting the power. Resulting in. In addition, since the temperature of the contact portion between the ball screw and the nut increases and wear occurs, the output of the servomotor cannot be efficiently transmitted to the molding die through the ball screw and the nut, and the molding efficiency is reduced. Will decrease. Further, since the molding die cannot be positioned with high accuracy, the molding accuracy of the molded product is reduced.
[0006]
Also, since the molding die is driven in the vertical direction by converting the rotational movement of the ball screw into linear movement by the nut portion, there is a limit even if the driving speed of the molding die is increased. The speed must be kept low, and the molding efficiency is reduced.
[0007]
Furthermore, the positioning accuracy of the molding die is affected by the influence of the heating of the servomotor, and the molding accuracy is not constant until the temperature of the servomotor becomes constant. Therefore, the yield at the beginning of molding is poor, and the molding efficiency is reduced. I will.
[0008]
Furthermore, since the height dimension of the molded product is affected by the bending generated in the machine body when the molding material is compression-molded, the dimensions of the molded product cannot be controlled with high accuracy, and the molding accuracy of the molded product is reduced. Will drop.
[0009]
The present invention has been made in view of the above-described conventional problems, and does not cause noise when driving a molding die, and the temperature of a portion for transmitting power increases. Power can be efficiently transmitted to the molding dies without being worn or worn, greatly improving the molding efficiency and positioning the molding dies with high precision. Therefore, the molding accuracy of the molded product can be greatly increased, the driving speed of the molding die can be increased, and thus the molding efficiency can be greatly increased. It is possible to mold a molded article with the precision of forming, to increase the yield, to improve the molding efficiency, and to cause the body to bend when the molding material is compression molded. Ku, and can control the size of the molded article with high accuracy, it is possible to improve the molding accuracy of the molded article, it is an object to provide a control method for a molding apparatus and molding apparatus.
[0010]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems. That is, the invention according to claim 1 includes a molding die including a lower mold and an upper mold that are relatively openably provided with a mold clamping mold, and a drive source that drives the lower mold and the upper mold. By driving the two molds in a direction to relatively close the molds by the operation of the drive source, in a molding apparatus for molding a molding material in a predetermined shape by compression molding a molding material between the two molds, The source is constituted by a linear motor.
According to the molding apparatus of the present invention, the molding material is located between the lower mold and the upper mold of the molding die, and the linear motor is operated to drive the lower mold and the upper mold in the direction of clamping the mold. The molding material is compression-molded between the two dies to form a molded product having a predetermined shape. Then, after molding, the linear motor is operated to drive the lower mold and the upper mold in the direction in which the molds are opened, whereby the molded article is released from between the two molds.
[0011]
The invention according to claim 2 is the molding apparatus according to claim 1, wherein the linear motor includes a stator provided on a body that drivably supports the lower mold and the upper mold; Each of the upper molds is provided with a movable element that is disposed to face the stator with a predetermined gap therebetween and that is driven relatively to the stator. Are connected.
According to the molding apparatus according to the present invention, the power supplied to the mover of the linear motor is controlled, and the mover is driven relative to the stator, so that the lower mold and the upper mold are clamped in the direction or It can be driven in the direction to open the mold.
[0012]
The invention according to claim 3 is the molding apparatus according to claim 2, wherein the lower mold or the upper mold includes at least two molds, and a mover is connected to each mold.
According to the molding apparatus according to the present invention, the power supplied to the mover of the linear motor is controlled, and the mover is driven relative to the stator, so that the lower mold and the upper mold are clamped in the direction or It can be driven in the direction to open the mold. In this case, since the lower mold or the upper mold is composed of at least two molds, the movable mold of each mold is driven relatively to the stator, thereby closing the mold between the lower mold and the upper mold. The opening can be performed in multiple stages.
[0013]
According to a fourth aspect of the present invention, there is provided a molding die comprising a lower die and an upper die which are relatively openably provided with a mold clamping die, and a fixing die which is provided on a body for supporting the lower die and the upper die so as to be drivable. And the lower mold and the upper mold, respectively, and are arranged to face the stator with a predetermined gap therebetween, and are connected to the lower mold or the upper mold that is driven relatively to the stator. A linear motor composed of a movable element, and controlling the power supplied to the movable element to control the relative drive of the movable element with respect to the stator, thereby allowing the lower mold and the upper mold to move relative to each other. It is driven in a direction in which the mold is closed or in a direction in which the mold is opened.
According to the control method of the molding apparatus according to the present invention, the molding material is located between the lower mold and the upper mold, the electric power supplied to the mover of the linear motor is controlled, and the mover is moved relative to the stator. By driving the lower mold and the upper mold in the direction to clamp the mold, the molding material is compression-molded between the lower mold and the upper mold to form a molded article having a predetermined shape. become. Then, after molding, the molded product is separated from the lower die and the upper die by driving the mover relatively to the stator and driving the lower die and the upper die in a direction in which the die is opened. Will be typed.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention shown in the drawings will be described.
FIG. 1 shows a first embodiment of a molding apparatus according to the present invention. The molding apparatus 1 is configured as a powder molding apparatus, and includes a molding die 15 and a molding die. The apparatus includes a driving source 8 for driving the molding die 15 and the body 2 for supporting the molding die 15 so as to be drivable.
[0015]
The body 2 is composed of a fixed platen 3, a pair of columns 4, 4 erected vertically above the fixed platen 3, and a pair of movable plates 5, 6 provided between the columns 4, 4. The movable plates 5 and 6 are provided between the columns 4 so as to be movable horizontally and vertically.
[0016]
The molding die 15 is composed of an upper die 16 and a lower die 20 which are provided so as to relatively open the mold clamping die. The upper die 16 is attached to the upper movable platen 5, and the lower die 20 is lower. It is attached to the movable platen 6 on the side.
[0017]
The upper die 16 has a two-stage cylindrical upper punch 17 composed of a small-diameter portion 19 and a large-diameter portion 18, and the axis of the upper punch 17 is perpendicular to the center of the lower surface of the upper movable platen 5. As described above, and is driven integrally with the upper movable platen 5 in the vertical direction. When the upper punch 17 is driven in the vertical direction integrally with the upper movable platen 5, the small-diameter portion 19 relatively fits into the through hole 22 of the die 21 described below from above.
[0018]
The lower die 20 includes a plate-shaped die 21 provided with a through hole 22 penetrating in the center in the vertical direction, and a cylindrical lower punch 23. The die 21 is integrally mounted on the lower movable platen 6 at the center of the upper surface thereof such that the axis of the through hole 22 coincides with the axis of the upper punch 17, and is driven vertically with the lower movable platen 6. It has become. The lower punch 23 is attached to the center of the upper surface of the fixed platen 3 so as to be integral with the through hole 22 of the die 21 so that the axis thereof is aligned. The lower punch 23 relatively fits into the through hole 22 of the die 21 from below when the die 21 is driven in the vertical direction integrally with the lower movable platen 6.
[0019]
The drive source 8 is a linear motor 8, and a stator 9 provided on the inner surface side of each column 4 along the up-down direction, and provided at both ends of each of the movable plates 5, 6. Movable elements 10 and 11 are disposed to face each other with a predetermined gap therebetween and are driven relatively to the stator 9.
[0020]
As a combination of the stator 9 and the movers 10 and 11, for example, a coil is wound around a stator 9 formed of a magnet plate and a groove of a coil plate that is arranged to face the stator 9 with a predetermined gap therebetween. Combination with the movable elements 10 and 11.
[0021]
When such a combination is adopted, the electric power supplied to the coils of the movers 10 and 11 is controlled by the control unit, so that the magnetic field generated between the movers 10 and 11 and the stator 9 causes , The movers 10 and 11 are driven relatively to the stator 9.
[0022]
Therefore, the stator 9 is provided on the inner surface side of each column 4, and the movers 10, 11 are provided at both ends of the movable plates 5, 6, respectively. By moving the movers 10 and 11 in synchronization with each other, the movable plates 5 and 6 are driven up and down while keeping the horizontal state, and the upper punch 17 and the die attached to the movable plates 5 and 6 are mounted. Reference numeral 21 denotes a unit that is driven integrally with the movable plates 10 and 11 in the vertical direction.
[0023]
In this case, the stator 9 is provided with a linear scale 13 for detecting the positions of the movers 10 and 11, and the control unit supplies electric power supplied to the movers 10 and 11 in accordance with a signal detected by the linear scale 13. By controlling, the movers 10 and 11 can be positioned at a predetermined position with high accuracy.
[0024]
Then, by moving both movers 11, 11 of the lower movable plate 6 of the linear motor 8 of the molding apparatus 1 configured as described above in synchronization, the die 21 is integrally formed with the lower movable plate 6. It is driven downward and positioned at a predetermined position, and the lower punch 23 is relatively fitted into the through hole 22 of the die 21 from below to a predetermined position, and a predetermined molding cavity 24 is placed above the lower punch 23. Then, a predetermined amount of a powdery molding material 25 is filled in the molding cavity 24.
[0025]
Then, by driving both movers 10 and 10 of the upper movable platen 5 of the linear motor 8 in synchronization with each other, the upper punch 17 is driven downward integrally with the upper movable platen 5 and the through-hole of the die 21 is formed. The small diameter portion 19 of the upper punch 17 is relatively fitted into the inside 22 from above, and the molding material 25 filled in the molding cavity 24 is compression molded between the die 21, the lower punch 23 and the upper punch 17, and molded. A molded product conforming to the shape of the cavity 24 is formed.
[0026]
In this case, by driving (vibrating) the upper punch 17 in small increments in the vertical direction integrally with the upper movable platen 5, the molding material 25 can be evenly distributed in the molding cavity 24. A molded article can be formed.
[0027]
Then, after the molding is completed, the upper mover 10 and the upper mover 5 are driven synchronously to drive the upper punch 17 integrally with the upper mover 5 to move the upper punch 17 upward. By detaching from the inside of the through hole 22 of the die 21 and simultaneously driving the two movers 11 of the lower movable plate 6, the die 21 is driven downward integrally with the lower movable plate 6. Then, the lower punch 23 is projected upward from the through hole 22 of the die 21, and the molded product is released from the molding cavity 24. Thus, a molded article having a predetermined shape can be obtained.
[0028]
In the molding apparatus 1 according to this embodiment configured as described above, the movable members 10 and 11 of the linear motor 8 are driven relatively to the stator 9 so that the upper movable plate 5 and the lower movable plate 5 are moved downward. The movable platen 6 on the side is driven up and down to open the mold clamping unit of the molding die 15 composed of the upper punch 17, the die 21 and the lower punch 23. Unlike the combination of the above, power is not transmitted via backlash, and quiet operation is possible. Further, since the movers 10 and 11 are not in contact with the stator 9, even if the movers 10 and 11 are driven relatively to the stator 9, the temperature of the portions may increase. The output of the linear motor 8 can be efficiently transmitted to the upper punch 17 and the die 21 via the movable plates 5 and 6 without being worn, and the molding efficiency can be greatly increased. become. Further, since the relative positioning of the movers 10 and 11 with respect to the stator 9 can be controlled with high accuracy, the vertical positions of the upper punch 17 and the die 21 via the movable plates 5 and 6 can be increased. Positioning can be performed with high accuracy, and the molding accuracy of the molded product can be greatly increased.
[0029]
Further, since the linear motions of the movers 10 and 11 of the linear motor 8 are transmitted to the upper punch 17 and the die 21 via the movable plates 5 and 6 as they are, the driving speed of the upper punch 17 and the die 21 is greatly reduced. The molding efficiency can be greatly increased.
[0030]
Further, since the stator 9 of the linear motor 8 and the movers 10 and 11 are not in contact with each other, the temperature of that portion does not rise, and the temperature of the linear motor 8 rises at the beginning of the molding due to the temperature rise. The precision is not affected, and the yield can be greatly increased, which can also greatly increase the molding efficiency.
[0031]
Further, since the body 2 hardly bends when the molding material 24 is compression-molded, the vertical positions of the movable plates 5 and 6, that is, the vertical positions of the upper punch 17 and the die 21 (the position of the molded product). (The dimension in the height direction) can be controlled with high precision, and thereby the molding precision of the molded product can be greatly increased.
[0032]
FIG. 2 shows a second embodiment of a molding apparatus according to the present invention. This molding apparatus 1 is for molding a powder molded product having a step in the vertical direction, and has two dies. 21 and a die 30. A second lower movable plate 7 is provided below the lower movable plate 6 to which the die 21 is attached, and a movable element 12 is provided at an end of the second lower movable plate 7. By driving the movers 11 and 12 with respect to 9, the dies 21 and 30 are separately driven, and the other configurations are the same as those described in the above embodiment.
[0033]
In the molding apparatus 1 shown in this embodiment, even if the object to be molded has a step in the vertical direction, that is, even if the upper and lower diameters are different, the driving of the die 21 and the die 30 and the upper punch 17. By individually controlling the driving of the lower punch 23, the density of the powder to be filled can be made uniform.
Then, the same operation and effect as those described above can be obtained.
[0034]
FIGS. 3 and 4 show a third embodiment of a molding apparatus according to the present invention. The molding apparatus 1 is configured such that each of the movable plates 5 and 6 is formed in a disk shape, and each of the movable plates is formed. Movers 10 and 11 are provided at the left and right ends and front and rear ends of 5 and 6, respectively, and stators 9 and 9 are provided along the vertical direction on the inner surface side of each support 4 facing each mover 10 and 11. , Each of the stators 9 and 9 and each of the movers 10 and 11 are opposed to each other with a predetermined gap therebetween to constitute a linear motor 8 as a drive source. Other configurations are the same as those of the first embodiment. Since they are the same as those shown in the embodiment, the same portions as those shown in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0035]
The embodiment shown in this embodiment also provides the same functions and effects as those of the first embodiment. In this embodiment, since the linear motors 8 are provided at the left and right ends and the front and rear ends of the movable plates 5, 6, the capacity of the linear motor 8 as a whole is shown in the first embodiment. Can be increased.
[0036]
Note that the upper mold and the lower mold are not limited to the above-described embodiment, and may be configured by two or more arbitrary numbers. In that case, the number of parts constituting the upper mold and the lower mold is The movable plate corresponding to the above is provided between the columns, and movers are provided at both ends of each movable plate, and both movers at both ends of each movable plate are driven in synchronization with each other, thereby forming a mold of a molding die. It suffices to open the mold.
[0037]
【The invention's effect】
As described above, according to the molding apparatus and the control method of the molding apparatus of the present invention, the lower mold and the upper mold of the molding die are driven by the operation of the linear motor. In this case, since power is not transmitted via backlash unlike a device that drives a molding die by transmitting power, a quiet operation can be performed. Further, since the power transmission portion does not rise in temperature or wear, the output of the linear motor can be efficiently transmitted to the lower mold and the upper mold, and the molding efficiency can be greatly increased. Furthermore, by electrically controlling the linear motor, the positions of the lower die and the upper die can be controlled with high precision, so that the molding accuracy of the molded product can be greatly increased. Further, since the linear motion of the linear motor can be directly transmitted to the lower mold and the upper mold, the driving speed of the lower mold and the upper mold can be greatly increased, and the molding efficiency can also be enhanced. Furthermore, since the temperature of the drive portion of the linear motor does not rise, the molding accuracy is not affected by the temperature rise of the linear motor in the early stage of molding, and the yield can be greatly increased. Therefore, the molding efficiency can be greatly increased. Furthermore, since the airframe hardly bends when the molding material is compression-molded, the vertical position of the lower mold and the upper mold can be controlled with high accuracy, thereby greatly increasing the molding accuracy of the molded product. Can be enhanced. Furthermore, by forming the lower mold and the upper mold with at least two molds, the molding material can be compression-molded in multiple stages, so that it is possible to cope with molded articles of various shapes.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an entire first embodiment of a molding apparatus according to the present invention.
FIG. 2 is a schematic view showing a main part of a second embodiment of a molding apparatus according to the present invention.
FIG. 3 is a schematic front view showing the entirety of a third embodiment of a molding apparatus according to the present invention.
FIG. 4 is a plan view of FIG. 3;
[Explanation of symbols]
1 Forming device 8 Drive source (linear motor)
9 Stator 10, 11, 12 Mover 15 Molding die 16 Upper die 17 Upper punch 20 Lower die 21, 30 Die 23 Lower punch 25 Molding material

Claims (4)

A molding die comprising a lower die and an upper die which are relatively openably provided with a mold clamping die, and a drive source for driving the lower die and the upper die are provided. In a molding apparatus for forming a molded article of a predetermined shape by compressively molding a molding material between the two dies by driving relatively in a mold clamping direction, the driving source is constituted by a linear motor. And molding equipment. The molding apparatus according to claim 1, wherein the linear motor is provided on a stator that is provided on a body that drivably supports the lower mold and the upper mold, and is provided on the lower mold and the upper mold, respectively. A movable element that is disposed to face the stator with a predetermined gap therebetween and that is driven relatively to the stator. The lower mold or the upper mold is connected to the movable element. Molding equipment. 3. The molding apparatus according to claim 2, wherein the lower mold or the upper mold includes at least two molds, and a mover is connected to each of the molds. A molding die composed of a lower die and an upper die which are relatively openably provided with a mold clamping die, a stator which is provided on a body for drivingably supporting the lower die and the upper die, and the lower die and the upper die A linear motor comprising a mover connected to the lower mold or the upper mold, which is provided on the mold, is disposed to face the stator with a predetermined gap therebetween, and is driven relatively to the stator. By controlling the power supplied to the mover, by controlling the relative drive of the mover to the stator, the direction or the mold opening to relatively clamp the lower mold and the upper mold A method for controlling a molding apparatus, comprising:

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