JP5766774B2 - Molding machine - Google Patents

Description

  The present invention relates to a molding machine including a tailstock that can be kept lightweight while being lightweight.

  2. Description of the Related Art Conventionally, a molding machine has been used in which a molten resin or a molten metal is continuously poured into a mold and cooled to obtain a molded / cast product. Many molding machines attach a fixed mold to a fixed die plate fixed on the molding machine and a movable mold to a movable die plate movable on the molding machine, and connect the movable die plate and the tailstock. A driving device (for example, a toggle link mechanism or a cylinder) moves the movable die plate to the fixed die plate side, brings the movable die into contact with the fixed die, and presses the movable die plate of the driving device (that is, A mold clamping force is generated by a tension generated between a fixed die plate and a tailstock), a molten resin or a molten metal is injected and injected into a cavity formed by a movable mold and a fixed mold, and the mold is cooled. The molding / casting is obtained by repeating the operation of opening the mold and taking out the molding / casting.

  In the molding machine as described above, in order to obtain a particularly large molding / casting, a large mold and a corresponding large molding machine are required. That is, the fixed die plate, the movable die plate, the driving device, and the tailstock are large-sized, and when installing the molding machine, it is necessary to carry them into the installation place in parts and assemble them on site. Moreover, the tailstock used conventionally needs high intensity | strength and is thickly formed with the heavy metal. For example, a tailstock 400 having a conventional shape as shown in FIG. 6 is formed to be thick enough to withstand the stress of the clamping force on each of the left and right side surfaces 401, the top and bottom bottom surfaces 402, and the back surface 405. As a result, even a stress of several tons can be used without being deformed.

  It is necessary to carry in / out such tailstock using a large crane or the like due to its weight, and the cost for carrying in / out has become very large. In addition, since it is necessary to form the metal with a large thickness, the manufacturing cost such as the material cost is a large burden.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a molding machine including a tailstock that realizes weight reduction while maintaining sufficient strength.

The molding machine according to claim 1 is a molding machine including a tailstock that is connected to a toggle link mechanism that moves the movable die plate forward or backward by being driven to extend or bend. A front rectangular portion formed by two horizontal beams extending vertically and two vertically extending vertical beams, and two horizontal beams and two vertical beams in the same manner as the front rectangular portion. A tie bar insertion hole is formed at the four corners of the front rectangular part and the rear rectangular part, and a cylindrical part connecting the front rectangular part and the tie bar insertion hole of the rear rectangular part is formed. In addition, the front rectangular portion is formed with a connecting portion that is connected to the toggle link mechanism, and the rear rectangular portion further includes a drive source mounting portion having a hole portion for mounting a drive source of the toggle link mechanism. form Are formed is Rutotomoni reinforcing portion, so that the amount of deflection of the toggle link joint portion becomes uniform, the horizontal beam of the forward rectangular portion for transmitting a load from the horizontal beams to the horizontal beams of the rear rectangular portion of the front rectangular section A thin load transmission bottom was formed.

According to the structure of Claim 1, compared with the conventional box-shaped tailstock, the inside of the rear rectangular part is made into a substantially cross-shaped reinforcing part, so that four portions can be lightened, and light weight Can be achieved. In addition, the front rectangular portion and the rear rectangular portion are connected by the cylindrical portions of the four corners, that is, the right and left side surfaces are thinned in the substantially rectangular parallelepiped tailstock formed by the front rectangular portion, the rear rectangular portion, and the cylindrical portion. Further weight reduction can be achieved. Further, the load from the front rectangular portion to the rear rectangular portion can be dispersed by the reinforcing portion and the upper and lower load transmission bottom portions, thereby preventing the tailstock from being deformed or distorted in the horizontal direction.

The molding machine according to claim 1 is a molding machine including a tailstock that is connected to a toggle link mechanism that moves the movable die plate forward or backward by being driven to extend or bend. A front rectangular portion formed by two horizontal beams extending vertically and two vertically extending vertical beams, and two horizontal beams and two vertical beams in the same manner as the front rectangular portion. A tie bar insertion hole is formed at the four corners of the front rectangular part and the rear rectangular part, and a cylindrical part connecting the front rectangular part and the tie bar insertion hole of the rear rectangular part is formed. In addition, the front rectangular portion is formed with a connecting portion that is connected to the toggle link mechanism, and the rear rectangular portion further includes a drive source mounting portion having a hole portion for mounting a drive source of the toggle link mechanism. form Are formed is Rutotomoni reinforcing portion, so that the amount of deflection of the toggle link joint portion becomes uniform, the horizontal beam of the forward rectangular portion for transmitting a load from the horizontal beams to the horizontal beams of the rear rectangular portion of the front rectangular section Since a thin load transmission bottom has been formed, the weight of the tailstock can be reduced by removing the two areas around the reinforcing part in the left and right side surfaces and the rear rectangular part compared to the conventional case. the strength of the tail stock was reduced by performing, distributed by reinforcement portion and the load transmitting bottom, prevents the rear rectangular portion of the tailstock by the drive source, the deformation such as distortion, such as dented toggle link mechanism side that Can do.

It is a side view which shows the state which the toggle link mechanism of the injection molding machine extended in the Example of this invention. It is a side view which shows the state which the toggle link mechanism of the injection molding machine bent in the same as the above. It is a top view of an injection molding machine same as the above. It is a back perspective view which shows the tailstock of an injection molding machine same as the above. It is a partially cutaway front perspective view showing the tailstock of the injection molding machine. It is a partially cutaway perspective view showing a tailstock having a conventional shape. It is explanatory drawing which shows the stress measurement point in a toggle link connection part. It is explanatory drawing which compared the deflection amount in the measurement point at the time of the mold clamping force generation | occurrence | production of the tail stock of a conventional shape, and the tail stock in a present Example. It is explanatory drawing which shows the load applied to the front vertical beam and side surface of the tailstock of a conventional shape and the tailstock in a present Example. It is a perspective view which shows the example of the shape of a tailstock different from the Example of this invention.

  The molding machine of the present invention is a molding machine including a tailstock that is connected to a toggle link mechanism that moves a movable die plate forward or backward by extending or bending, and the tailstock extends two horizontally. The front rectangular portion and the rear rectangular portion are formed in a substantially square shape by the horizontal beam provided and the two vertically extending vertical beams. An insertion hole is formed, a cylindrical portion is formed to connect the tie bar insertion holes of the front rectangular portion and the rear rectangular portion, and a hole for attaching a drive source as a drive source of the toggle link mechanism is further formed in the rear rectangular portion A drive source mounting portion is formed, and the rear rectangular portion is formed with a substantially cross-shaped reinforcing portion that connects the opposing portions with the drive source mounting portion interposed therebetween.

  According to the configuration of the present invention, compared to a conventional box-shaped tailstock, the inside of the rear rectangular portion is made into a substantially cross-shaped reinforcing portion, so that four portions can be cut out and lightened. Can be achieved. In addition, the front rectangular portion and the rear rectangular portion are connected by the cylindrical portions of the four corners, that is, the right and left side surfaces are thinned in the substantially rectangular parallelepiped tailstock formed by the front rectangular portion, the rear rectangular portion, and the cylindrical portion. Further weight reduction can be achieved. The strength of the tailstock, which is reduced by weight reduction, increases the thickness of the two beams in the vertical direction of the front rectangular part, and increases the thickness of the substantially cross-shaped reinforcing part formed in the rear rectangular part. Realized by reinforcement.

Molding machine of the present invention, the left and right sides of the front Symbol tailstock, a connecting portion for transmitting the load from the front rectangular section rearwardly rectangular section, characterized in that the upper and lower of the connecting portion and a hollow formed.

  According to the configuration of the present invention, the load can be distributed from the front rectangular portion to the rear rectangular portion by the connecting portions on the left and right side surfaces, thereby preventing the vertical deformation / distortion of the tailstock.

Load molding machine of the present invention, the upper base and the lower base portion of the front Symbol tailstock, the thin-walled than the horizontal beam of the forward rectangular portion, convey a load from the horizontal beams of the front rectangular portion to the horizontal beam of the rear rectangular section A transmission bottom portion is formed.

  According to the configuration of the present invention, the load from the front rectangular portion to the rear rectangular portion can be dispersed by the upper and lower load transmission bottoms, thereby preventing the tailstock from being deformed or distorted in the horizontal direction.

  Embodiments as the best mode for carrying out the present invention will be described below with reference to FIGS. Of course, it goes without saying that the present invention can be easily applied to other than those described in the embodiments without departing from the spirit of the invention.

1 to 5 show an embodiment of the present invention, and FIG. 1 is a side view showing a state where a toggle link mechanism of an injection molding machine is extended. FIG. 2 is a side view showing a state where the toggle link mechanism of the injection molding machine is bent. FIG. 3 is a plan view of the injection molding machine. FIG. 4 is a rear perspective view showing a tailstock used in the injection molding machine of the present embodiment. FIG. 5 is a partially cutaway front perspective view of the tailstock shown in FIG. In the following description, the left side (motor 7 side) of FIG. 1 in FIG. 1 is the rear side, the right side (fixed die plate 2 side) is the front side, the upper side in FIG. 1 is upward, the lower side is downward, and the upper side in FIG. Is on the right and the bottom is on the left.

  The structure of the injection molding machine of a present Example is demonstrated based on FIG. FIG. 1 is a side view showing an injection molding machine. An injection molding machine 1 obtains a molded product by injecting molten resin into a cavity (not shown) formed by bringing the movable mold 11a and the fixed mold 11b into contact with each other and cooling and solidifying the resin. . Reference numeral 2 denotes a fixed die plate for attaching a fixed mold, which is fixed to a base portion of an injection molding machine 1 (not shown). Reference numeral 3 denotes a tie bar having one end fixed to the fixed die plate 2 and the other fixed to a tailstock described later. In this embodiment, there are four tie bars, which are supported and fixed by the fixed die plate 3 and the tail stock. A tail stock 4 supports one end of the tie bar 3 and is fixed to a base portion (not shown) except during mold thickness adjustment. Reference numeral 5 denotes a movable die plate having a toggle link connecting portion for connecting a toggle link mechanism, which will be described later, on one side and a movable die mounting surface for attaching the movable die 11a on the other side. Reference numeral 6 denotes a toggle link mechanism, which is supported by the tailstock 4 and is responsible for mold closing and mold opening operations of the movable die plate 5, and transmits the mold clamping force to the movable die plate 5. Reference numeral 7 denotes a motor as a driving source for driving the toggle link mechanism 6. A pulley 8 is rotated by the rotation of the motor 7. A belt 9 transmits the rotation of the motor 7 to the pulley 8. Reference numeral 10 denotes a ball screw which is a motion conversion mechanism that rotates together with the rotation of the pulley 8 and converts the rotation operation into a driving force for moving the toggle link mechanism 6 in the mold closing / mold opening direction.

  The operation at the time of manufacturing a molded product by the injection molding machine 1 having the above configuration will be described. The fixed die 11b is attached to the fixed die plate 2, and the movable die 11a is fixedly attached to the movable die plate 5. At this time, the toggle link mechanism 6 is folded as shown in FIG. 2, and the fixed mold 11b and the movable mold 11a are separated from each other. In this state, the motor 7 operates to rotate the pulley 8 via the belt 9. The rotation of the pulley 8 becomes the rotation of the ball screw 10 as it is, and the rotation motion of the ball screw 10 is converted into a linear motion and the toggle link mechanism 6 is extended. The toggle link mechanism 6 is connected to a tail stock 4 that is fixed so as not to move. The toggle link mechanism 6 pushes the movable die plate 5 toward the fixed die plate 2 starting from the connecting portion with the tasltock 4. When the movable die 11a attached to the movable die plate 5 comes into contact with the die 11b attached to the fixed die plate, the toggle link mechanism 6 is extended by a clamping force (pressing two molds to form a cavity. The force for preventing resin leakage) further presses the movable die plate 5, that is, the movable mold 11a. In a state where the mold clamping force is generated, the outward stress is generated with respect to the fixed die plate 2 and the tail stock 4 around the toggle link mechanism 6, and the fixed die plate 2 and the tail are generated on the tie bar 3. The tension that pulls the stock 4 is generated as stress. As shown in FIG. 1, the toggle link mechanism 6 has an inclination α that is a predetermined angle from the horizontal direction, and the tail stock 4 has the center on the outside and the end on the inside by the inclination α and the stress against the clamping force. (I.e., in the direction of the arrows in FIGS. 1 and 4).

  Next, the detailed shape of the tail stock 4 for preventing the deformation of the tail stock 4 will be described with reference to FIGS. FIG. 4 is a perspective view showing the back surface of the tail stock 4, and FIG. 5 is a partially cutaway perspective view showing the front surface. Reference numeral 41 denotes a front rectangular portion, which is integrally formed by connecting a vertical beam 41a and a horizontal beam 41b. Reference numeral 42 denotes a rear rectangular portion, which is integrally formed by connecting a vertical beam 42a and a horizontal beam 42b in the same manner as the front rectangular portion. The vertical beam 41a is formed to have a cross-sectional area that satisfies “horizontal cross-sectional area / maximum mold clamping force of molding machine ≧ 0.5”. Reference numeral 43 denotes a cylindrical portion that integrally connects the front rectangular portion 41 and the rear rectangular portion 42, and the cylindrical portion 43 is formed with a tie bar insertion hole 43 a for inserting and fixing the tie bar 3. Reference numeral 44 denotes a reinforcing portion formed in a substantially cross shape, and a drive source mounting portion 45 is formed at a central portion where the beams intersect. A load transmission bottom 46 fills a gap between the horizontal beam 41b of the front rectangular portion 41 and the horizontal beam 42b of the rear rectangular portion 42 corresponding thereto. Reference numeral 47 denotes a toggle link coupling portion for coupling with the toggle link mechanism 6, and a toggle pin insertion hole 47 a for inserting a toggle pin (not shown) is formed.

  6 to 10 show the difference in the stress value in each case and the amount of deflection of the tail stock at a predetermined position when the tail stock 4 having the above configuration is used and when the tail stock 400 having the conventional shape is used. ing. 6 is a partially cutaway perspective view showing a tailstock 400 having a conventional shape, and FIG. 7 is a partially enlarged perspective view showing a toggle link connecting portion of the tailstock 4. A to F are measurement points for measuring the degree of deformation of the tailstock due to the stress of the clamping force. FIG. 8 is a diagram showing the amount of deflection in the tail stock 400 of the conventional shape and the tail stock of the present embodiment at each location shown in FIG. When the mold clamping force is generated, the amount of bending of the conventional shape and the tail stock 4 in this embodiment at each of the points A to F shown in FIG. 7 is located outside the tail stock as shown in FIG. The amount of deflection of the measurement points E and F is larger than the other measurement points. That is, in the conventional tailstock, the amount of outward deflection becomes large. On the other hand, the amount of deflection of the tailstock 4 in this embodiment is relatively uniform at all the measurement points A to F. That is, the tail stock 4 in the present embodiment has a balanced shape change with respect to the conventional shape, thereby eliminating the vertical displacement of the toggle pin insertion hole 47a and inserting it into the toggle pin insertion hole 47a. It is possible to suppress deformation with respect to a toggle pin (not shown) for connection with the.

  FIG. 9 quantifies the load applied to the tailstock 400 having a conventional shape and the tailstock 4 of this embodiment, which is applied by the mold clamping force. When the maximum mold clamping force of the injection molding machine is generated using the tailstock 400 of the conventional shape, the load applied to the front vertical beam (G in FIG. 6) is 40 Mpa, and the load applied to the side surface is 30 Mpa. On the other hand, the load applied to the front vertical beam 41a (G in FIG. 5) in the tailstock of the present embodiment when the maximum mold clamping force is generated is 60 Mpa, and the side surface is in a normal state where the side is thinned. Because there is, it becomes 0Mpa. When the tail stock 4 in the present embodiment is used, the load on the front vertical beam 41a is increased because the side surface and the upper and lower bottom surfaces are thinned compared to the tail stock of the conventional shape. Since it is within the range, there is no practical problem, and the tailstock 4 can be further reduced in weight while making the above-described deflection amount uniform.

  According to the injection molding machine provided with the tail stock 4 as described above, it is possible to form a lot of lightening portions as compared with conventionally used tail stock, to reduce the weight and to reduce the material for forming. be able to. By reducing the weight, it can be transported by a small crane or the like when the molding machine is installed, and the cost required for transportation can be suppressed. Furthermore, since the amount of materials required for formation is smaller than that of the conventional material, the cost for manufacturing can be suppressed. In addition, the vertical beam 41a of the front rectangular portion 41 is formed with a thickness so that at least the cross-sectional area / clamping force ≧ 0.5 so that the strength does not become insufficient due to the thinned portion. It is possible to maintain the same strength as the above.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the reinforcing portion 44 of the rear rectangular portion 42 is not a cross shape that intersects the vertical direction and the horizontal direction as shown in FIG. 4, but may be a cross shape that is orthogonal to each other as shown in FIG. 10. Absent. Further, although the present embodiment has been described as an injection molding machine, there is no problem even if it is applied to other molding machines such as a die casting machine.

DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 Fixed die plate 3 Tie bar 4 Tail stock 41 Front rectangular part 41a Vertical beam of front rectangular part 41b Horizontal beam of front rectangular part 42 Rear rectangular part 42a Vertical beam of rear rectangular part 42b Horizontal beam of rear rectangular part 43 Cylindrical part 44 Reinforcing part 45 Drive source mounting part 46 Load transmission bottom part 5 Movable die plate 6 Toggle link mechanism 7 Motor 8 Pulley 9 Belt 10 Ball screw 11 Mold 11a Movable mold 11b Fixed mold

Claims (1)

A molding machine comprising a tailstock connected to a toggle link mechanism for moving a movable die plate forward or backward by extending or bending driving,
The tailstock includes a front rectangular portion formed by two horizontally extending horizontal beams and two vertically extending vertical beams, and two horizontal beams similar to the front rectangular portion. It consists of a rear rectangular part formed by a beam and two vertical beams,
Tie bar insertion holes are formed at the four corners of the front rectangular part and the rear rectangular part, and a cylindrical part that connects the tie bar insertion holes of the front rectangular part and the rear rectangular part is formed,
In addition, a connecting portion that connects to the toggle link mechanism is formed in the front rectangular portion,
Furthermore said rearward rectangular portion drive source mounting portion having a hole for mounting the drive source of the toggle link mechanism is formed Rutotomoni reinforcing portion is formed,
A load transmission bottom portion that is thinner than the horizontal beam of the front rectangular portion that transmits the load from the horizontal beam of the front rectangular portion to the horizontal beam of the rear rectangular portion is formed so that the amount of bending at the toggle link connecting portion is uniform. A molding machine characterized by

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