JP5778804B2 - Injection molding machine fixed platen - Google Patents

Description

  The present invention relates to a stationary platen used in an injection molding machine.

  In the injection molding machine, for the purpose of discharging the molten resin in the heating cylinder, a purge operation that is an operation of injecting the molten resin into the air with the nozzle away from the mold may be performed. At this time, if the molten resin at high temperature is scattered and hitting a person, there is a possibility of injuries such as burns. Therefore, a protective cover is provided to prevent the molten resin from scattering. Hereinafter, this protective cover is referred to as a purge cover.

  The heating cylinder also has a high temperature at the time of resin injection, and may be burned if touched directly by hands at this high temperature, and is provided with a protective cover. Hereinafter, this protective cover is referred to as a heat cover.

  In addition, when the nozzle is brought into contact with the mold to obtain a molded product, or when the nozzle is moved away from the mold to perform a purging operation, the injection mechanism section including the heating cylinder is in contact with the mold clamping mechanism section. It will go back and forth. The purge cover is fixed to the injection unit side of the stationary platen of the mold clamping mechanism, and the heat cover is fixed to any member of the injection mechanism. The positional relationship between and the overlapping lengths of the two also change.

As a technique related to the purge cover and the heat cover, there are techniques disclosed in the following patent documents.
Patent Document 1 discloses a technique for narrowing the gap by reducing the gap between the shield body and the tip of the cylinder assembly on the injection unit side end face of the purge shield of the injection molding machine.
Patent Document 2 discloses a technique relating to a purge cover structure of an injection molding machine in which the purge cover can be easily detached from the front plate of the injection molding machine.

Japanese Utility Model Publication No. 2-73312 JP-A-5-309694

In the technique disclosed in Patent Document 1, the injection unit side edge is brought close to the tip of the cylinder assembly, but the injection unit side edge is made close to the cylinder unit as appropriate. It may be difficult to make adjustments.
The technique disclosed in Patent Document 2 discloses that the purge cover can be easily detached from the front plate, but does not disclose the relationship between the purge cover and the heat cover.

  In order to adjust the gap between the purge cover and the heat cover, it is necessary to appropriately maintain the positional relationship between the purge cover and the heat cover. Here, since the fixed plate for fixing the purge cover has a complicated three-dimensional structure, it is general that only a necessary portion is finished by cutting or the like after producing a rough shape by casting. At this time, since the casting surface of the fixed plate has irregularities, if the purge cover is fixed directly by making a tapped hole on the surface, the purge cover is tilted or distorted by the irregularities of the casting surface. There is a possibility of being fixed by.

  In order to prevent burns due to contact with the heating cylinder, it is desirable that the gap between the purge cover and the heat cover be set to a width that does not allow the hand or finger to reach the heating cylinder. However, if the cover is tilted or fixed in a distorted state due to the unevenness of the casting surface of the fixed platen, the gap between the purge cover and the heat cover disappears and the injection mechanism moves forward and backward. At this time, there is a possibility that the purge cover and the heat cover come into contact with each other, or conversely, the gap becomes large and a finger or the like can come into contact with the heating cylinder.

  However, even with a fixed plate of the same design, the uneven shape of the casting surface differs from one to another, so it is difficult to design a cover in consideration of the inclination and distortion amount of the purge cover. Although it is possible to adjust the height by inserting spacers etc. according to the irregularities of each casting surface, prepare the corresponding spacers by measuring the irregular shape of the casting surface of each fixed platen Therefore, it is necessary to adjust the amount of the spacer to an optimal balance without inclination or distortion while attaching or removing the purge cover, resulting in an increase in the number of assembly steps.

  In order to reduce the influence of unevenness on the casting surface, the purge cover mounting surface of the fixed platen can be finished flat by cutting etc., but the unevenness can be eliminated, but if the entire fixed platen is cut, the cutting area will be There is a risk that the processing cost will increase.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stationary platen for an injection molding machine in which a purge cover can be attached while maintaining a positional relationship with a heat cover with a minimum increase in processing cost.

In the invention according to claim 1 of the present application , the surface is uneven by being made by casting, and has a plurality of protrusions whose height from the surface is larger than the height of the unevenness, and the ends of the protrusions The flat portion has a flat portion, the flat portion has a tap hole for attaching a purge cover, and the flat portions provided in the plurality of projecting portions are all on the same plane. A fixed plate of an injection molding machine is provided.
In the invention according to claim 1, a protruding portion that protrudes from the surface of the fixed platen is provided, a flat portion is provided at an end of the protruding portion, and a tap hole for attaching a purge cover is provided in the flat portion. Therefore, the surface to be flattened can be limited to the flat surface of the protrusion, not the entire surface of the fixed plate on the purge cover mounting side, so the purge cover can be tilted while reducing the amount of processing to flatten. It becomes possible to install without distortion.

In addition, since the height from the surface of the fixed platen to the flat portion of the protruding portion is configured to be higher than the height of the uneven surface of the fixed platen's casting surface, it is more than the unevenness of the casting surface of the fixed platen surface. It becomes possible to fix in a floating state, and it becomes possible to attach a purge cover without the influence of irregularities on the casting surface of the fixed platen surface.
Furthermore, since all the plane parts are configured to be on the same plane, it becomes possible to reduce the amount of moving the tool at the time of machining, or it is possible to work together with a large tool, Processing time can be shortened. In addition, the structure of the purge cover can be further simplified by configuring the flat portions to be all on the same plane.

In the invention according to claim 2 of the present application, the flat portion, according to claim 1, characterized in that it is formed in the mating orientation and position of the orientation and position of the surface having the fixing bolt holes of the purge cover An injection molding machine stationary platen is provided.
In the invention according to claim 2 , when the plane portion has a surface having the hole for fixing bolt of the purge cover facing in various directions or provided at different heights, the plane portion is Since the purge cover is formed in the direction and position according to the direction and position of the surface having the fixing bolt hole, the purge cover can be securely attached.

In the invention according to claim 3 of the present application, the protrusion protrudes mold opening and closing the axial direction, the flat portion, an injection molding machine according to claim 1 or 2, characterized in that perpendicular to the mold opening and closing axial A fixed plate is provided.
In the invention according to claim 3 , the projecting portion is projected in the mold opening / closing axis direction, and the flat portion is configured to be orthogonal to the mold opening / closing axis direction, thereby aligning the mounting direction of the purge cover and the orientation of the projecting portion. Since the portion is set in a direction perpendicular to it, the processing time of the flat portion and the tap hole for attaching the purge cover can be reduced, and the structure of the purge cover can be simplified.

In the invention which concerns on Claim 4 of this application, the number of the said protrusion parts is the same number as the number of tap holes, The fixing plate | board of the injection molding machine in any one of Claims 1-3 characterized by the above-mentioned is provided. The
In the invention according to claim 4 , since the number of protrusions and the number of tap holes are the same, it is only necessary to process a necessary portion around the tap hole, so that it is possible to reduce the processing amount of the flat portion. Become.

  According to the present invention, it is possible to provide a fixed plate for an injection molding machine to which a purge cover can be attached while maintaining a positional relationship with a heat cover with a minimum increase in processing cost.

It is the figure which showed the relationship between the fixed plate | board, purge cover, and heat cover of the injection molding machine in embodiment of this invention. It is the figure which showed the stationary platen of the injection molding machine in 1st Embodiment. It is the figure which showed the stationary platen of the injection molding machine in 2nd Embodiment. It is the figure which looked at the stationary platen of the injection molding machine in 3rd Embodiment from the side surface. It is the figure which showed the stationary platen of the injection molding machine in 4th Embodiment.

(First embodiment)
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a view showing a relationship among a stationary platen, a purge cover, and a heat cover of an injection molding machine in the present embodiment. Reference numeral 50 denotes a fixed plate of the injection molding machine, and 10 denotes a purge cover fixed to the fixed plate 50 by a fixture. In the purge cover 10, a heating cylinder 30 of an injection part of an injection molding machine and a nozzle 40 at the tip thereof are inserted. Even if a purge operation, which is an operation of injecting the molten resin into the air with the nozzle 40 separated from the mold, is performed by the purge cover 10, the high-temperature molten resin is scattered and burns on a person or the like. Can be prevented.

  Reference numeral 20 denotes a heat cover that covers the heating cylinder 30 and is a protective cover for preventing direct contact with the heating cylinder 30. When the heating cylinder 30 moves back and forth, the heat cover 20 covering the heating cylinder 30 also moves back and forth, and the length of the overlap between the purge cover 10 and the heat cover 20 changes.

FIG. 2 is a view showing a stationary platen of the injection molding machine in the present embodiment. A nozzle entry hole 54 through which the nozzle 40 of the heating cylinder 30 enters is provided in the central portion, and the central portion 51 around the nozzle entry hole 54 is raised more than the peripheral portion 53.
Two square frustum-shaped protrusions 58 are provided at two locations below the center 51, a flat part 56 is provided at the protruding end, and a purge cover mounting tap is provided near the center of the flat part 56. A hole 52 is provided. In addition, protrusions 58 are provided at two locations on the left and right sides of the peripheral portion 53, and each of the protrusions 58 is provided with two purge cover mounting tap holes 52. Further, a purge cover mounting tap hole 52 is provided in the upper portion of the central portion 51, and a purge cover mounting tap hole 52 is provided in the left direction of the left portion.

  The fixed platen 50 is manufactured by casting and has a complicated three-dimensional structure, so that a rough shape is manufactured. For this reason, the surface that has not been processed by cutting or the like is manufactured without any irregularities or dimensional accuracy on the cast surface. Here, the height of the protrusion 58 in FIG. 1 from the casting surface of the fixed platen 50 to the flat surface 56 is set to a value larger than the height of the irregularities on the casting surface. As a result, the purge cover 10 is fixed in a state where it floats above the casting surface, and the inclination and distortion of the purge cover 10 can be reduced when the purge cover 10 is fixed. In addition, the purge cover 10 in the present embodiment is provided with not-shown fixing bolt holes in the direction toward the mold opening / closing axis, but also in the upward direction and the left direction. The purge cover mounting taps 52 provided at the portions are fixed to the fixing bolt holes respectively provided upward or leftward of the purge cover 10.

  Further, in the present embodiment, since the central portion 51 has a shape protruding from the peripheral portion 53, the purge cover mounting tap hole 52 provided thereon is also based on the peripheral portion 53. Although the height at the time is different, this is also adapted to the difference in height of the surface of the purge cover 10 on which the fixing bolt hole (not shown) is formed.

  Thus, the protrusion 58 and the purge cover mounting tap hole 52 provided on the stationary platen 50 in the present embodiment are matched to the direction and position of the surface of the purge cover 10 where the fixing bolt hole is formed. Thus, the purge cover 10 can be securely fixed to the stationary platen 50 while maintaining the positional relationship with the heat cover 20. Moreover, since it is limited to the flat part 56 of the protrusion part 58 to process the casting surface which has the unevenness | corrugation on the surface manufactured by casting, it becomes possible to reduce a processing amount. . In addition, although many protrusion parts were shown in figure, it is not necessary to have all these, and what is necessary is just to provide as much as it is necessary for purge cover fixation.

(Second Embodiment)
FIG. 3 is a view showing a stationary platen of an injection molding machine according to the second embodiment. In the present embodiment, all of the protruding portions 58 protrude in the mold opening / closing axis direction on the side where the purge cover 10 is attached, and the flat portion 56 provided at the end of these protruding portions 58 is the mold opening / closing axis line. It is formed so as to be orthogonal to the direction.

  By adopting such a configuration, the direction of the flat portion 56 and the purge cover mounting tap hole 52 provided in the flat portion 56 is the same direction, and the flat portion 56 and the purge cover mounting tap hole 52 are processed. When performing, it is not necessary to change the orientation of the fixed platen 50 or tool serving as a workpiece, so that the machining time can be reduced. Moreover, since the purge cover 10 to be attached is also attached in the mold opening / closing axis direction, the structure of the purge cover 10 can be simplified by setting the flat portion 56 in a direction orthogonal to the mold opening / closing axis direction.

(Third embodiment)
FIG. 4 is a side view of the stationary platen of the injection molding machine according to the third embodiment. In the present embodiment, all of the protruding portions 58 protrude in the mold opening / closing axis direction on the side where the purge cover 10 is attached, and the flat portion 56 provided at the end of these protruding portions 58 is the mold opening / closing axis line. It is formed so as to be orthogonal to the direction, and all the flat portions 56 are formed on the same plane.

  By adopting such a configuration, since the flat portions 56 are all on the same plane, when the flat portion 56 and the purge cover mounting tap hole 52 are processed, the amount of movement of the tool during processing is reduced. Since it can be reduced or processed together with a large tool, the processing time can be shortened. The term “on the same plane” in the present embodiment is not limited to the case of being completely on the same plane, and includes those having a difference of about tolerance.

(Fourth embodiment)
FIG. 5 is a view showing a stationary platen of an injection molding machine according to the fourth embodiment. In the present embodiment, as shown in FIGS. 2 and 3, one long protrusion 58 having a plurality of purge cover mounting tap holes 52 is not provided, and one protrusion 58 is provided. A purge cover mounting tap hole 52 is provided.

  As shown in FIGS. 2 and 3, when a long protrusion 58 having a plurality of purge cover mounting tap holes 52 is provided, a plurality of spaced apart purge cover mounting tap holes 52 in the plane portion 56 are provided. Although it is necessary to process between the two, if the configuration as in the present embodiment, it is only necessary to process the periphery of the purge cover mounting tap hole 52 in the flat portion 56, so the processing amount of the flat portion is reduced. It becomes possible.

  As the surface accuracy during processing of the flat portion 56, it is desirable that any one of Ra, Ry, and Rz in the surface roughness is Ra: 25, Ry: 100, and Rz: 100 or less. By setting it to this value or less, it is possible to attach the purge cover 10 so as not to be distorted or inclined when the purge cover 10 is attached.

DESCRIPTION OF SYMBOLS 10 Purge cover 20 Heat cover 30 Heating cylinder 40 Nozzle 50 Fixed plate 51 Center part 52 Purge cover attachment tap hole 53 Peripheral part 54 Nozzle entrance hole 56 Plane part 58 Projection part

Claims (4)

It has irregularities on the surface by being made by casting,
Having a plurality of protrusions whose height from the surface is larger than the height of the irregularities ;
A flat portion at an end of the protruding portion;
The flat portion has a tap hole for attaching a purge cover ,
The fixed plate for an injection molding machine, wherein the flat portions provided in the plurality of protrusions are all on the same plane . 2. The fixing plate for an injection molding machine according to claim 1, wherein the flat portion is formed in a direction and a position in accordance with a direction and a position of a surface having a fixing bolt hole of the purge cover . The protruding portion protrudes in the mold opening / closing axis direction,
The fixed plate for an injection molding machine according to claim 1 or 2, wherein the flat portion is orthogonal to the mold opening / closing axis direction . The fixed plate of the injection molding machine according to any one of claims 1 to 3, wherein the number of protrusions is the same as the number of tap holes .