JP3396754B2 - Press forming machine for ceramic products - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press molding machine equipped with a toggle link mechanism for molding a base material for ceramic products.

[0002]

2. Description of the Related Art As a conventional example, a press molding machine 100 as shown in FIG. 11 is known (for example, Japanese Utility Model Publication 7-16).
(See Japanese Patent No. 404). This type of press molding machine 100
Includes a toggle link mechanism 136 which is a booster mechanism, an electric motor 142 and a crank mechanism 150 are used as drive sources, and the rotational movement of the electric motor 142 is transmitted to the so-called crank mechanism 150, and the rotational movement is performed. By being converted into a linear motion, the linear motion is transmitted to the toggle link mechanism 136, and the ram 118 connected to the toggle link mechanism 136 is moved up and down.

Therefore, the force of the linear motion of the toggle link mechanism 136 is doubled, so that a sufficient pressing force for the lower die 128 is attached to the ram 118.
It is designed to extend to.

The conventional press molding machine 100 includes a ram 1
One guide cylinder 158 is planted on 18 and the lifting arm 14 having a pair of toggle link mechanisms 136 coupled thereto
One guide shaft 152 is vertically provided below 0, and the guide shaft 152 is inserted into the guide hole of the guide cylinder 158.

Thus, the electric motor 142 and the crank mechanism 150 are used as driving means, and the toggle link mechanism 136 is actuated to move the ram 118 up and down.
Since the ram 118 is guided up and down via the guide cylinder 158 via the guide rail 158, the upper die 124 attached to the ram 118 also moves up and down in a stable state without deviating. .

As a result, ceramic products such as roof tiles, which are the objects to be molded, are normally molded, and the ram 118 can reciprocate at high speed.

In addition, a guide shaft 158 provided on the ram 118 and a guide shaft 152 vertically provided on the elevating arm 140.
Are slidable with respect to each other and the crank mechanism 150 is connected to the elevating arm 140.
Since the upper surface and the lower surface of 40 are supported in a double-supported state at all times, even if the reaction force from each toggle link mechanism 136 is different, the lifting arm 140 is not bent and deformed.

However, since the electric motor 142 and the crank mechanism 150 are used as the driving means, the ascending / descending speed of the ram 118 during the process from the top dead center T to the bottom dead center B or from the bottom dead center B to the top dead center T is the electric motor 142. It was impossible to freely change the rotation speed and the crank mechanism 150 (see FIGS. 7, 8 and 11). Therefore, the number of pressurizations can be arbitrarily changed by changing the lowering speed of the upper mold 124 or the pressing force during one stroke of the ram 118 for adjustment, or temporarily stopping or restarting the ram 118 during one stroke. Due to the adjustment, the flow of the raw material in the upper and lower molds cannot be controlled according to the shape of the molding target, and there is a problem that the type of the molding target is limited.

Further, the electric motor 142 and the crank mechanism 1
Since 50 is adopted, the speed reducer 143 is required, the problem that the structure of the press molding machine 100 is complicated, and the speed reducer 1
There is a problem in that maintenance is complicated because there are many lubricating points for 43 and the crank mechanism 150.

Moreover, since the center of gravity of the press molding machine 100 tends to be at a relatively high position due to the adoption of the crank mechanism 150, the stability of the press molding machine 100 may be impaired. Therefore, it is necessary to reduce the weight of the crank mechanism 150 relative to the weight of the entire press molding machine 100, which causes a problem that the press molding machine 100 becomes large. In addition, there is a problem in that the generation of noise accompanying the operation of the crank mechanism 150 cannot be avoided and the facility environment deteriorates.

Since the electric motor 142 and the crank mechanism 150 are used as the driving means, the ram 118 is used.
In the process from the bottom dead center B to the top dead center T, the ram 118 including the upper mold 124, which is a heavy load, and the toggle link mechanism 13 are provided.
6 is lifted, and as a result, the crank mechanism 1
The load of 50 on the crank lever 146 and the rod 148 is large, and the crank lever 146 may be damaged by metal fatigue or the electric motor 142 may be damaged due to overload.

On the other hand, as another conventional example, a press molding machine 200 as shown in FIG. 12 is known (for example, see Japanese Utility Model Publication No. 7-2170). This type of press molding machine 200 includes the electric motor 14 in the conventional example described above.
The hydraulic cylinder 242 is adopted in place of 2, the piston rod 250 is adopted in place of the crank mechanism 150, and the other structure is basically the same as the above-mentioned conventional one.

This press molding machine 200 has an electric motor 14
Since the hydraulic cylinder 242 and the piston rod 250 are used as driving means instead of 2 and the crank mechanism 150, the ascending / descending speed of the ram 118 during the stroke from the top dead center T to the bottom dead center B or from the bottom dead center B to the top dead center T. Can be freely changed, and the lowering speed of the upper mold 124 can be changed according to the shape of the object to be molded during the ascending / descending process of the ram 118 to control the raw material flow in the upper and lower molds. There is an advantage.

However, due to the characteristics of the hydraulic cylinder 242, the reciprocating motion of the ram 118 cannot be performed at high speed, and it is difficult to accurately specify the bottom dead center B of the ram 118. Further, in addition to the main body of the press molding machine 200, a hydraulic unit 252 for controlling the hydraulic cylinder 242 is required, and these hydraulic units 252 are large-scaled.

Therefore, in addition to requiring an installation space for the hydraulic unit 252, it is necessary to periodically perform maintenance such as replacement of hydraulic oil in the hydraulic unit 252.
Further, there is a problem that the equipment environment is deteriorated due to hydraulic oil leakage of the hydraulic unit 252 and the hydraulic cylinder 242.

Further, both of the conventional press molding machines 10 are used.
The guide shafts 152 of 0 and 200 are fixed to the lift arm 140 on the side of the lift arm 140, and the ram 118 side of the guide cylinder 158 is fixed to the ram 118.
52 on the ram 118 side and the elevating arm 14 on the guide shaft 152.
The 0 side is free.

Therefore, when the reaction force from the toggle link mechanism 136 is different, the force for bending and deforming the elevating arm 140 is regulated by the guide of the guide shaft 152 and the guide cylinder 158. When moving up and down, the base of the guide shaft 152 (the lower end in the drawing) and the guide tube 1
The stress concentrates on the base portion of 58 (upper end in the drawing), and particularly stress concentrates when descending.

Further, in the normal operation of the press molding machines 100 and 200 in which the ram 118 moves up and down continuously, the bases of these are repeatedly subjected to stress.

As a result, metal fatigue causes breakage of the guide shaft 152, the guide cylinder 158 and the guide shaft 152.
The sliding surface 156 may be unevenly worn or the base of the cylinder 158 may be damaged.

In particular, when the ceramic product to be molded has a complicated shape such as an accessory roof tile, the upper mold 124 is used.
Since the reaction force with respect to the applied pressure is not uniform, an eccentric load is generated in each toggle link mechanism 136, resulting in further concentration of stress on the guide shaft 152 and the base of the guide cylinder 158.
There was a high possibility that the guide shaft 152 and the guide cylinder 158 would be damaged relatively early.

[0021]

SUMMARY OF THE INVENTION An object of the present invention is to change and adjust the lowering speed of the upper die and the pressing force during one stroke of the ram, and to stop or restart the ram during one stroke. It is possible to adjust the number of pressurization arbitrarily performed and accurately control the flow of raw materials in the upper and lower molds according to the shape of the object to be molded so that there is no restriction on the type of object to be molded. To do. To simplify the structure of the press molding machine and eliminate the complexity of maintenance. Keep the center of gravity relatively low to ensure the stability of the press molding machine. Prevent the deterioration of the equipment environment due to noise and oil leaks. High-speed reciprocating motion of the ram. Accurately identify the bottom dead center of the ram. No large-scale equipment other than the press molding machine body is required. Suppress damage to the guide shaft that guides the lifting and lowering action of the ram. It is to provide a press molding machine that satisfies the above conditions. Also,
Another object is to reduce overload on the drive means.

[0022]

According to the press molding machine for ceramic products of the invention described in claim 1, a bed is provided in the molding machine main body, and the ram can be raised and lowered through the pillars planted in the bed. A lower mold is provided on the bed, and an upper mold is provided on the ram so as to face each other.On the other hand, a drive means is provided on a support body provided on the upper part of the molding machine main body, and a pair of toggle link mechanisms is provided on the support body. In a press molding machine for ceramic products in which a pair of toggle link mechanisms are connected to a ram, a pair of toggle link mechanisms is connected by an elevating arm, and the elevating arm is provided to be able to move up and down via a drive means A movable guide shaft is planted on the upper surface of the ram, a slidable sliding body is fitted to the guide shaft, the sliding body is fixed to the elevating arm, and the driving means is a servomotor,
The servo motor is provided with a feed screw, the lifting arm is provided with a screw corresponding to the feed screw, and the feed screw is fitted to the screw.

According to a second aspect of the present invention, there is provided a press forming machine for ceramic products, in which a bed is provided in the main body of the forming machine, and a ram is provided so as to be able to move up and down through a pillar planted in the bed. The mold is provided with the upper mold facing the ram, respectively, while the driving means is provided on the support body provided on the upper part of the molding machine body, and the pair of toggle link mechanisms is connected to the support body and the ram. In a press molding machine for ceramic products in which the toggle link mechanism of is connected by an elevating arm, and the elevating arm is provided to be able to elevate and lower through a driving means, a guide shaft slidable on the upper surface of the ram A sliding body that is planted on the lower surface of the support body and is slidable with respect to the guide shaft is fitted, and the sliding body is fixed to the elevating arm, and the driving means is a servo motor and a feed screw to the servo motor. Is provided Are, together with the screw corresponding to the feed screw to the lifting arm is provided, in which a screw feed to the screw is characterized in that it is fitted.

According to a third aspect of the present invention, there is provided a press forming machine for a ceramic product in which a bed is provided in the forming machine main body, and a ram is provided so as to be able to move up and down through a support pillar planted in the bed. The mold is provided with the upper mold facing the ram, respectively, while the driving means is provided on the support body provided on the upper part of the molding machine body, and the pair of toggle link mechanisms is connected to the support body and the ram. In a press molding machine for ceramic products in which the toggle link mechanism of is connected by an elevating arm, and the elevating arm is provided so as to be able to ascend and descend through a drive means, a guide shaft slidable with respect to a ram and a support body of the molding machine body. Is provided, the fixing member is fixed to the guide shaft, the sliding body is fixed to the elevating arm, the drive means is a servo motor, and the servo motor is provided with a feed screw.
A press molding machine for ceramic products, wherein the lifting arm is provided with a screw corresponding to the feed screw, and the feed screw is fitted to the screw.

The press molding machine for ceramic products according to a fourth aspect is the press molding machine for ceramic products according to the first, second or third aspect. It is characterized by having means.

[0026]

Therefore, since the press molding machine for ceramic products according to claim 1 is configured as described above,
When the lifting arm is activated by the operation of the servo motor and the feed screw that are the driving means, the toggle link mechanism is activated,
The ram moves up and down. At this time, the ram being raised and lowered is always controlled to an accurate position by the servo motor and the feed screw. In addition, the lowering speed of the upper mold and the pressing force are changed during one stroke of the ram according to the type of the molded object, and the ram is temporarily stopped or restarted during one stroke to perform arbitrary pressurization. Precisely control the flow of raw material in the upper and lower molds. On the other hand, a guide shaft provided on the support and the ram moves up and down together with the ram, and a slide body fitted to the guide shaft and provided on the lift body slides as the ram moves up and down.

Therefore, since the driving means by the servomotor and the feed screw are adopted, the ram being raised and lowered is always controlled to an accurate position, and the raising and lowering movement of the ram can be performed at high speed, which is highly accurate. The object to be molded can be efficiently molded. In addition, the lowering speed and pressure of the upper die can be changed and adjusted during one stroke of the ram according to the type of the object to be molded, and the ram can be temporarily stopped or restarted during one stroke. The number of pressurizations can be adjusted, and the flow of raw materials in the upper and lower molds can be accurately controlled during the process according to the shape of the object to be molded, making it possible to mold a wide variety of objects to be molded with high precision. it can.

Further, since the driving means by the servo motor and the feed screw are adopted, the structure of the press molding machine is simplified, and the feed screw can be simply maintained as required, and the complicated maintenance is required. do not need.

Further, although the drive means and the feed screw by the servo motor are provided above the ram, the weight ratio of the drive means to the total weight of the press molding machine is relatively low, so that the press molding machine has a relatively small weight. The position of the center of gravity can be lowered, and the stability of the press molding machine can be further ensured.

Further, since the drive means by the servomotor and the feed screw are adopted, mechanical noise and oil leakage such as hydraulic oil do not occur, so that a facility environment with less dirt and no noise can be achieved.

Moreover, since no large-scale equipment other than the press molding machine is required, no extra installation space or maintenance is required, so that the running cost can be reduced.

Further, even if an unbalanced load is generated from the sliding body to the guide shaft through the ram or toggle link mechanism, the lower end of the guide shaft is fixed to the ram, and so to speak, both ends are supported by the support near the upper end. Since it has a built-in force, the stress concentration on the guide shaft is dispersed up and down, so that the guide shaft always comes into contact with the guide shaft with a constant sliding surface at any point during the process from top dead center to bottom dead center. Because I hold
The stress on the guide shaft is distributed over the sliding surface, and the guide shaft and the sliding body are not damaged by the unbalanced load.

Further, since the press molding machine for ceramic products according to the second aspect is configured as described above, when the elevating arm is actuated by the operation of the servo motor as the driving means and the feed screw, the toggle link mechanism is formed. Is activated and the ram moves up and down. At this time, the ram being raised and lowered is always controlled to an accurate position by the servo motor and the feed screw.

Further, the lowering speed and the pressing force of the upper mold are changed during one stroke of the ram according to the type of the object to be molded, and the ram is temporarily stopped or restarted during the one stroke so that an arbitrary pressure is applied. And then
Precisely control the flow of raw material in the upper and lower molds. On the other hand, a guide shaft provided on the support and the ram is fixed to the support, and a slide body provided on the lift body and fitted on the guide shaft slides as the ram and the lift body move up and down. Therefore, the same effect as that of the invention according to claim 1 is achieved.

Further, since the press forming machine for ceramic products according to the third aspect of the present invention is configured as described above, when the elevating arm is operated by the operation of the servo motor as the driving means and the feed screw, the toggle link. The mechanism operates and the ram moves up and down. At this time, the ram being raised and lowered is always controlled to an accurate position by the servo motor and the feed screw. In addition, the lowering speed of the upper mold and the pressing force are changed during one stroke of the ram according to the type of the molded object, and the ram is temporarily stopped or restarted during one stroke to perform arbitrary pressurization. Precisely control the flow of raw material in the upper and lower molds. On the other hand, a guide shaft provided on the support and the ram is fixed to a fixing member, a fixing member for fixing the guide shaft is fixed to the elevating body, and the guide shaft slides with respect to the supporting body and the ram along with the elevating body. To do. Therefore, the same effect as that of the invention according to claim 1 is achieved.

In addition, the press molding machine for ceramic products according to the fourth aspect of the invention is provided with a raising assisting means for supplementarily raising the ram in addition to the function and effect of the invention according to the first, second or third aspect. Therefore, in the process in which the ram goes from the bottom dead center to the top dead center, the servo motor and the feed screw raise the ram, and the assisting means raises the ram. Therefore, the servo motor is overloaded. Never.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a press molding machine according to an embodiment of the present invention, FIG. 2 is a side view of the press molding machine, and FIG. 3 is the same press in which a ram, a support, a lifting arm and a sliding body are broken. FIG. 4 is a side view of the molding machine, and FIG. 4 is a sectional view taken along the line AA of FIG. FIG. 5 is a block diagram showing the control mechanism of the servomotor, FIG. 6 is an enlarged perspective view of the lifting arm and the sliding body, and FIG. 7 is an upper view by the press molding machine and the conventional press molding machine at the time of molding eave tiles. It is an operation characteristic view comparing the operation characteristics of the mold. FIG. 8 is an operation characteristic diagram comparing the operation characteristics of the upper mold by the press molding machine and the conventional press molding machine at the time of forming a sleeve tile. FIG. 9 is a side view of a press molding machine according to another embodiment, FIG. 10 is a side view of a press molding machine according to yet another embodiment, and FIG. 11 is a front view of a conventional press molding machine. And Figure 1
2 is a front view showing another conventional press molding machine.

The press molding machine according to this embodiment is
It is for forming clay roof tiles. The molding machine main body 10 includes a bed 12, and support columns 14 are planted at four corners of the bed 12, respectively.

The upper ends of the columns 14 are the main body 10 of the molding machine.
The ram 1 is fixed to a support 16 provided on the upper part of the ram 1, the lower end of which is fixed to the bed 12, and the column 14 is movable up and down.
8 is fitted.

An upper die 24 for roof tile formation is attached to the lower surface of the ram 18 via an upper die mounting base 20.
A lower die 28 is attached to the upper side via a lower die mounting base 26, and the upper die 24 attached to the ram 18 descends toward the lower die 28 to press-form a wasteland, which is a type of ceramic product. It is designed so that a molded article of clay roof tile can be obtained.

A pair of toggle link mechanisms 36 including a first link 30, a second link 32 and a third link 34 are arranged between the ram 18 and the support 16. The first link 30 of the toggle link mechanism 36 has an oval shape, and both ends thereof are supported by rotating shafts 38a and 38b, respectively, and one end of the toggle link mechanism 36 is mounted on the upper surface of the ram 18 via the rotating shaft 38a. Is rotatably pivotally mounted, and the other end thereof is pivotally mounted on a rotary shaft 38b at the outer end of the second link 32 described below.

The second link 32 has a substantially triangular shape, and rotation shafts 38b, 38c, 38d are provided near the apexes, respectively.
Is supported by the first link 30, and is pivotally attached to the first link 30 via a rotation shaft 38b on the first link 30 side.

Of the remaining vertices, the support 16 side is rotatably attached to the support 16 via a rotary shaft 38d.

The remaining one point is attached to the outer end of the third link 34, which will be described below, via a rotary shaft 38c.

The third link 34 has an oval shape,
Similar to the first link 30, the rotary shafts 38c, 38 are provided at both ends thereof.
It has a structure in which e is fitted. The outer end of the third link 34 is pivotally attached to a point on the inner side of the second link 32 described above via a rotating shaft 38c, and the inner end thereof is rotated to the outer end of the elevating arm 40 described below. It is pivotally mounted via a moving shaft 38e.

Therefore, the pair of left and right toggle link mechanisms 36, which are composed of the first link 30, the second link 32 and the third link 34, are connected to the elevating arm 40.

The lifting arm 40 has an oval shape,
It is horizontally arranged near the center of the toggle link mechanism 36, and the inner ends of the third links 34 are pivotally attached to both side ends of the elevating arm 40 via pivot shafts 38e. A screw 50 corresponding to a feed screw 43 described later is provided on the elevating arm 40, and the elevating arm 40 is controlled to elevate and lower via the screw 50 by the rotation of the feed screw 43.

In this way, by raising and lowering the raising and lowering arm 40 which operates following the rotation of the feed screw 43, each link 30,
32 and 34 cooperate, and the toggle link mechanism 36 moves the ram 18
Can be moved up and down between the top dead center T and the bottom dead center B.

On the other hand, the upper surface of the support 16 is provided with a servomotor 42 which is feedback-controlled as a drive source for raising and lowering the ram 18. This servo motor 4
One end of the feed screw 43 is fixed to 2, and the other end is directed downward.

The servo motor 42 is provided with a position detecting means 44 by an encoder and a servo motor controller 46, and also a separately provided arithmetic processing means 72, storage means 76, input means 82, display means 84 and pulse generation means 74. It is controlled so as to freely rotate forward and backward by the control mechanism 70 (see FIG. 5).

The rotation control of the servo motor 42 will be described in detail. The pulse signal generated from the pulse generating means 74 of the control mechanism 70 is output to the servo motor controller 46 via the control circuit 48, and the servo motor 42 outputs the pulse signal. The rotation based on is performed.

The actual rotational speed of the servo motor 42 is returned as a feedback pulse signal from the position detecting means 44 using an encoder for pulse generation to the control mechanism 70 through the servo motor controller 46, and to the arithmetic processing means 72 of the control mechanism 70. The pulse signal is input and the pulse signal from the pulse generating means 74 is compared with the feedback pulse signal to detect the amount of separation, and the operation instruction is output again as a pulse signal.

The control mechanism 70 includes a RAM 80 and a ROM 78.
A memory means 76 is provided for controlling the servo motor, a simulation molding program, and some operating conditions of the servo motor 42 (see FIG. 7).
And FIG. 8) can be stored.

Further, the operating condition can be rewritten by the input means 82 provided in the control mechanism 70 via the interface, and the operating condition of the servo motor 42 or the operating condition of the servo motor 42 can be displayed by the display means 84 provided in the interface. It is possible to display the operating state in which power characteristics and the like are graphed (see FIGS. 5, 7, and 8).

The control mechanism 70 is provided with a sequencer 86 for controlling the related equipment of the press molding machine 10 such as the air cylinder 64 via the interface and a related equipment control means 88. It is configured so that it can be controlled corresponding to the operation of 42.

The feed screw 43 provided on the servo motor 42 is inserted into the elevating arm 40 through the screw 50, and the rotational movement of the feed screw 43 by the operation of the servo motor 42 causes the elevating arm 40 to pass through the screw 50. It is designed so that it can be converted into a linear motion that moves up and down.

Next, the relationship between the guide shaft 52 and the sliding body 54 will be described. When viewed from the side of the press molding machine 10 (see FIGS. 2 and 3), the lower end of the guide shaft 52 is fixed near both ends of the upper surface of the ram 18, and the upper end of the guide shaft 52 slides with respect to the support body 16. It is pierced freely.
Therefore, the elevating arm 40, the toggle link mechanism 36, and the feed screw 43 are located between the guide shafts 52.

On the other hand, when the press molding machine 10 is viewed from the front (see FIG. 1), the lower end of the guide shaft 52 is located at the center of the upper surface of the ram 18.

In this embodiment, the two guide shafts 52 are arranged so that the toggle link mechanism 36 and the ram 18 are provided.
It is intended to more surely suppress the unbalanced load to, but not necessarily to limit the number (FIG. 1,
(See Figures 3 and 6). For example, two guide shafts 5
The two may be simply one guide shaft 52.

Next, the sliding body 54 will be described. The sliding body 54 is composed of a pair of cylindrical portions 58 having sliding holes 56 and a horizontal arm portion 60 connecting the cylindrical portions 58 on both sides, and has been described above. Each tubular portion 58 is slidably fitted to the guide shaft 52, and the horizontal arm portion 60 is fixed to the lower surface of the elevating arm 40 so as to be orthogonal to the elevating arm 40 (see FIG. 6).

Therefore, the sliding member 54 fixed to the elevating arm 40 operates following the rotation of the feed screw 43 via the elevating arm 40, and as a result, is guided by the guide shaft 52 and slides.

On the other hand, the guide shaft 52 fixed to the ram 18
Is guided by the raising and lowering of the raising and lowering arm 40 by the rotation of the feed screw 43, and the upper and lower sides are supported by the support body 16 and are raised and lowered in the vertical direction.

Next, the raising assist means 62 for assisting the raising of the ram 18 in the ascending stroke from the bottom dead center B to the top dead center T of the ram 18 will be described. Climbing aid 62
Is due to the weight of the ram 18, the upper die 24, and the like on the servo motor 42, the feed screw 43, and the screw 50 by the drive source different from the servo motor 42 in the process of the ram 18 from the bottom dead center B to the top dead center T. Ram 18 to prevent overload
Is a means to supplementally raise.

In this embodiment, an air cylinder 64 is adopted as a specific example of the lifting assisting means 62, and the air cylinders 64 are provided on both side surfaces of the support body 16 as viewed from the side surface of the press molding machine 10. It is attached from the side to the ram 18, and the end of the cylinder rod 66 of the air cylinder 64 is attached to the side surface of the ram 18 (see FIG. 1).
Through FIG. 4).

Therefore, when the ram 18 reaches the bottom dead center B, the cylinder rod 66 of the air cylinder 64 expands to the maximum, and the air cylinder 64 moves in the process of the ram 18 reaching from the bottom dead center B to the top dead center T. Actuating, the cylinder rod 66 contracts to assist the raising action of the ram 18.

In the process from the top dead center T to the bottom dead center B of the ram 18, the weight of the ram 18 itself can be added as a pressing force, so that the air cylinder 64 does not need to be positively operated.

In this embodiment, the raising assisting means 62 is the air cylinder 64, but it is not limited as long as it is a means for assisting the raising of the ram 18.

The ram 18 of the press-molding machine body 10 is located at the top dead center T when the operation is stopped, and the elevating arm 40 fitted to the feed screw 43 via the screw 50 is located at the uppermost position. There is. Each link 30 of the toggle link mechanism 36,
32 and 34 are in a state of contracting toward the inside of the press molding machine 10, and are the air cylinder 6 that is the raising assisting means 62.
4, the cylinder rod 66 is in a free state.

When the servo motor 42 is driven in this state to rotate in the forward direction, the servo motor 42 rotates the feed screw 43, and the rotational movement of the feed screw 43 is converted to the linear movement of the elevating arm 40 through the screw 50, and the elevating arm 40 is moved up and down. The arm 40 descends due to the rotation of the feed screw 43. The toggle link mechanism 3 is moved along with the lowering of the elevating arm 40 fitted to the feed screw 43.
The links 30, 32, and 34 of 6 are rotated toward the outside of the press molding machine 10, and the ram 18 descends.

Then, the upper die 24 provided on the ram 18 descends together with the ram 18, and the waste land (not shown) placed on the lower die 28 is press-formed to reach the bottom dead center B of the ram 18.

In the process from the top dead center T to the bottom dead center B, the ram 18 is controlled extremely accurately by the rotation of the numerically controlled servo motor 42, and the ram 18 is based on the operating condition according to the kind of the molding target. Controlled.

For example, when the material to be molded is an eaves tile, in order to optimize the flow of the raw materials in the upper and lower molds, the upper mold 24 is molded for the first time during one stroke as shown in FIG. Two
The operating condition for realizing the operating characteristic of the second molding is set. When the type of the molding target is changed, the operating condition is set according to the type of the molding target and the molding is performed. For example, when a sleeve tile is formed as shown in FIG. 8, the upper mold 24 is preformed during one stroke, first forming,
The operating conditions are set so that the operating characteristic of the second molding is realized.

Further, when the toggle link mechanism 36 extends, it becomes the bottom dead center B of the upper die 24. However, when molding is performed a plurality of times during one stroke, the elevating arm 40 at the bottom dead center B of the upper die 24. The toggle link mechanism 36 may be contracted to raise the upper mold 24 by further lowering the elevating arm 40 from. By further lowering the raising / lowering arm 40 from the position of the raising / lowering arm 40 at the top dead center T of the upper die 24, the upper die 24 is not rotated from the forward rotation to the reverse rotation of the servo motor 42 for a plurality of moldings in one stroke.
It is possible to realize the fall and rise of.

When molding the same object for a long period of time, a program for automatically changing the operating conditions according to the cumulative number of moldings is set in the control mechanism 70.
The inventor also plans to control the ram 18 according to the state of wear of the upper and lower dies.

When the molding of the waste land is completed, the servo motor 42 is rotated in the reverse direction, and the ram 18 moves to the servo motor 42.
In addition to the ascending action by the above, the air cylinder 64 that is the ascending assisting device 62 receives a pulling force as an auxiliary to the top dead center
To return to the original position.

When the ram 18 reaches the top dead center T, the operation of the air cylinder 64 is stopped and the cylinder rod 66 of the air cylinder 64 becomes free. Then, the servo motor 42
Is rotated again, the ram 18 descends from the top dead center T to the bottom dead center B again, and the above-described stroke is repeated.

In molding a roof tile having a complicated shape,
When a non-uniform reaction force with respect to the pressing force of the upper mold 24 is generated,
Although it is applied to the guide shaft 52 through the sliding surface 56 of the sliding body 54, the sliding body 54 has a constant sliding surface 56, both ends of the guide shaft 52 are supported, and the guide shaft 52 supports the supporting body 16. Since it is slidably provided, local concentration of stress on the guide shaft 52 is suppressed.

Therefore, the guide shaft 52 and the sliding body 54 are not damaged, the toggle link mechanism 36 can be operated stably over a long period of use, and the guide shaft 52 and the sliding body 54 are damaged. Therefore, the stable operation of the toggle link mechanism 36 is not hindered.

Since the guide shaft 52 and the sliding member 54 are not damaged, stress concentration due to the non-uniform reaction force does not occur in the servo motor 42, the feed screw 43 and the screw 50. It is possible to maintain stable high-speed molding.

As described above, according to the press molding machine 10 according to the present embodiment, the ram 18 that is moving up and down is always controlled to an accurate position, and the ram 18 can be moved up and down at high speed. It is possible to efficiently mold an object to be molded with high accuracy.

In addition, the lowering speed of the upper mold 24 and the pressing force can be changed and adjusted during one stroke of the ram 18 according to the type of the molded object, and the ram 18 can be stopped temporarily during one stroke. You can restart and adjust the number of pressurization arbitrarily,
Since the flow of the raw materials in the upper and lower molds is accurately controlled during the stroke according to the shape of the molding target, a wide variety of molding targets can be molded with high accuracy, and the versatility is extremely high.

Further, since the driving means by the servo motor 42 and the feed screw 43 are adopted, the structure of the press molding machine 10 is simplified, and the feed screw 43 can be simply maintained as needed. No need for complicated maintenance.

Further, the servo motor 42 and the feed screw 43
Although the driving means is provided above the ram 18, the ratio of the weight of the driving means to the total weight of the press molding machine 10 is relatively low, so the position of the center of gravity of the press molding machine 10 is lowered. Therefore, the stability of the press molding machine 10 can be further ensured.

Further, by adopting the drive means by the servo motor 42 and the feed screw 43, mechanical noise and oil leakage such as hydraulic oil do not occur, so that a facility environment with less dirt and noise can be achieved. it can. Moreover, since no large-scale equipment other than the press molding machine 10 is required,
Since there is no need for extra installation space or maintenance, running costs can be reduced.

Further, the driving means by the servomotor 42 and the feed screw 43 are provided, and the raising and lowering arm 40 is provided with the feed screw 4.
By providing the screw 50 corresponding to No. 3 and the raising assisting means 62, the ram 18 is moved to the bottom dead center B.
From the top to the dead center T in the ascending stroke
Servo motor 42, feed screw 4 by a drive source different from 2
The ram 18 can be supplementarily raised so as not to overload the 3 and the screw 50 with the weight of the ram 18 and the upper mold 24.

Then, if a simulation program is provided in the control mechanism 70 and necessary data is inputted by the input means 82, the molding process of the object to be molded is displayed on the display means 84 without operating the servo motor 42 by the control mechanism 70. can do. Therefore, the simulation molding can be performed in advance, the state of the pulse signal corresponding to the simulation molding can be grasped, and the change and setting of the operating condition according to the type of the molding target can be performed quickly and easily.

Next, a press molding machine according to another embodiment will be described. In the embodiment described above, the case where the guide shaft 52 is fixed to the upper surface of the ram 18 and is slidable with respect to the support body 16 of the press molding machine body 10 has been described, but as another embodiment, The upper end of the guide shaft 92 may be fixed to the support 16a of the press molding machine body 10a, and the other end of the guide shaft 92 may be slidable with respect to the ram 18a (see FIG. 9). This guide shaft 92
According to this configuration, it has the same function as the guide shaft 52 described above.

As yet another embodiment, a guide shaft 98 composed of an upper guide 94 and a lower guide 96.
Is fixed to the fixing member 54b, and the upper guide 92 is slidable with respect to the support body 16b of the press molding machine body 10b.
The lower guide 96 may be configured to be slidable with respect to the ram 18b (see FIG. 10). This guide shaft 9
According to the structure of No. 8, it has a function equivalent to the guide shafts 52 and 52b mentioned above.

[Brief description of drawings]

FIG. 1 is a front view of a press molding machine according to an embodiment of the present invention.

FIG. 2 is a side view of the press molding machine.

FIG. 3 is a side view of the press molding machine in which a ram, a fixing member, a lifting arm, a sliding body, and the like are broken.

FIG. 4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a block diagram showing a control mechanism of a servo motor.

FIG. 6 is an enlarged perspective view of a lifting arm and a sliding body.

FIG. 7 is an operation characteristic diagram when eave roof tiles are formed by the press forming machine.

FIG. 8 is an operation characteristic diagram of the upper mold when the sleeve roof tile is molded by the press molding machine.

FIG. 9 is a side view of a press molding machine according to another embodiment.

FIG. 10 is a side view of a press molding machine according to still another embodiment.

FIG. 11 is a front view of a conventional press molding machine.

FIG. 12 is a front view showing another conventional press molding machine.

[Explanation of symbols]

10 Press molding machine body 10a Press molding machine body 10b Press molding machine body 12 beds 14 Support pillars 16 Support 18 Ram 20 Upper die mounting base 22 Mold 24 Upper mold 26 Lower mounting base 28 Lower mold 30 First Link 32 Second Link 34 Third Link 36 Toggle link mechanism 38a rotation axis 38b rotation axis 38c rotation axis 38d rotation axis 38e rotating shaft 40 Lifting arm 42 Servo motor 43 lead screw 44 Position detecting means 46 Servo motor controller 48 control circuit 50 screw 52 Guide shaft 54 Sliding body 54a sliding body 54b fixing member 56 Sliding surface 58 cylinder 60 Horizontal arm 62 Ascending assistance means 64 air cylinder 66 Cylinder rod 70 Control mechanism 72 arithmetic processing means 74 pulse generation means 76 storage means 78 ROM 80 RAM 82 Input means 84 display means 86 Sequencer 88 Related equipment control means 92 Guide shaft 94 Upper guide shaft 96 Lower guide shaft 98 Guide shaft 100 press molding machine 118 rum 124 Upper mold 128 lower mold 136 toggle link mechanism 140 Lifting arm 142 Electric motor 143 reducer 146 crank lever 148 rod 150 crank mechanism 152 Guide shaft 156 sliding surface 158 cylinder 200 press molding machine 242 hydraulic cylinder 250 piston rod 252 hydraulic unit T top dead center B bottom dead center

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B28B 3/02

Claims (4)

(57) [Claims] 1. A molding machine main body is provided with a bed, and a ram is provided so as to be able to move up and down via a pillar planted in the bed,
A lower mold is provided on the bed, and an upper mold is provided on the ram so as to face each other.On the other hand, a driving means is provided on a support provided on the upper part of the molding machine main body, and a pair of toggle link mechanisms are provided on the support and the ram. In a press molding machine for ceramic products in which a pair of toggle link mechanisms are connected by an elevating arm, and the elevating arm is provided to be able to move up and down via a drive means, The guide shaft is planted on the upper surface of the ram, the sliding body that is slidable with respect to the guide shaft is fitted, and the sliding body is fixed to the elevating arm. A press forming machine for a ceramic product, wherein a feed screw is provided, a screw corresponding to the feed screw is provided on the lifting arm, and the feed screw is fitted to the screw. 2. A bed is provided in the molding machine main body, and a ram is provided so as to be able to move up and down via a pillar planted in the bed,
A lower mold is provided on the bed, and an upper mold is provided on the ram so as to face each other.On the other hand, a driving means is provided on a support provided on the upper part of the molding machine main body, and a pair of toggle link mechanisms are provided on the support and the ram. In a press-molding machine for ceramic products in which a pair of toggle link mechanisms are connected by an elevating arm and the elevating arm is vertically movable via a driving means, a guide shaft slidable on the upper surface of the ram is used. A sliding body that is embedded in the lower surface of the support of the molding machine body and is slidable with respect to the guide shaft is fixed to the elevating arm, and the driving means is a servo motor. A press molding machine for a ceramic product, characterized in that the motor is provided with a feed screw, the lifting arm is provided with a screw corresponding to the feed screw, and the feed screw is fitted to the screw. 3. A bed is provided in the molding machine main body, and a ram is provided so as to be able to move up and down through a pillar that is planted in the bed,
A lower mold is provided on the bed, and an upper mold is provided on the ram so as to face each other.On the other hand, a driving means is provided on a support provided on the upper part of the molding machine main body, and a pair of toggle link mechanisms are provided on the support and the ram. In a press molding machine for ceramic products in which a pair of toggle link mechanisms are connected by an elevating arm, and the elevating arm is provided to be able to move up and down via a driving means, sliding with respect to the support of the ram and the forming machine body. A free guide shaft is provided, a fixing member is fixed to the guide shaft, the fixing member is fixed to the elevating arm, the driving means is a servo motor, and the servo motor is provided with a feed screw to feed the elevating arm. A press molding machine for ceramic products, characterized in that a screw corresponding to the screw is provided and a feed screw is fitted to the screw. 4. The press molding machine for a ceramic product according to claim 1, 2 or 3, wherein the molding machine main body is provided with a lifting assisting means for assisting the lifting of the ram.