TWI477379B - To mold the plastic plate / tube and the method of casting the plastic plate / tube - Google Patents

Description

Mold for pouring rubber sheet/tube and method for pouring injection rubber sheet/tube

The present invention relates to a mold for making a plastic sheet/tube and a method for manufacturing a plastic sheet/tube, and more particularly to a mold for pouring a rubber sheet/tube and a method for pouring an injection sheet/tube.

Referring to Figure 1, the Republic of China Announcement No. I253976 "Method for manufacturing a plastic plate and a method for manufacturing a plastic plate" discloses a mold 1 for manufacturing a plastic plate, comprising an upper die 11, a lower die 12, and a The sealing device 13 and a plurality of clamping devices 14 for clamping the upper mold 11, the lower mold 12 and the sealing device 13.

The sealing device 13 includes a sealing body 131 for providing rigidity, and two pressing members 132 respectively located on the upper surface and the lower surface of the sealing body 131 and having elasticity.

The main mold 11 and the lower mold 12 are pressed by the clamping force of the clamping device 14, and the elastic pressing member 132 is pressed to make the slurry 100 receive the upper mold 11 and the lower portion. The pressing of the die 12 flows in the direction of the sealing device 13 so that the slurry 100 shrinks in the thickness direction of the die 1 when it solidifies.

Referring to FIGS. 1 and 2, although the mold 1 can utilize the extrusion control of the upper mold 11 and the lower mold 12, the upper mold 11 and the lower mold 12 directly press the pressing member 132. As the elasticity of the pressing member 132 is different, and the clamping force of the clamping device 14 is different, the pressure of the upper mold 11 and the lower mold 12 acting on the slurry 100 is different, thereby causing The finished product 101 will form a case where the thickness is uneven as shown in FIG.

Accordingly, it is an object of the present invention to provide a mold for casting a rubber sheet/tube that can be formed into a plastic sheet/tube having a uniform thickness.

Another object of the present invention is to provide a method of making an injection molded rubber sheet/tube having a uniform thickness uniformity.

Therefore, the mold for casting the rubber sheet/tube of the present invention comprises a first mold, a second mold spaced apart from the first mold, and a molding disposed between the first mold and the second mold. unit.

The molding unit includes an expandable frame disposed between the first die and the second die, and a first die, the second die and the expandable frame are cooperatively defined to fill the plastic The filling space of the slurry, the expandable frame can be controlled to expand to apply lateral pressure to the plastic slurry in the filling space.

The method of casting a rubber sheet/tube of the present invention is carried out by using the above mold, and the method comprises a preparation step, a casting step, a molding step, and a take-out step.

The preparing step is to form the molding unit clip between the first mold and the second mold by using a clamp; the pouring step is to inject the plastic slurry into the filling space; the molding step is to use the clamp to the first Applying pressure to the second mold and expanding the expandable frame, and the first mold and the second mold restrict the expandable frame to generate lateral expansion to apply the plastic slurry in the filling space. Lateral pressure; the removing step is to take out the cured plastic slurry from the filling space to obtain a plastic plate/tube of a predetermined thickness .

The beneficial effects of the present invention are that the first mold and the second mold are used to restrict the expandable frame body, and the expandable frame body is laterally expanded to apply lateral pressure to the plastic slurry in the filling space. When the plastic slurry is cured and formed, the amount of shrinkage in the thickness direction can be replaced by the lateral shrinkage amount, thereby ensuring a more uniform thickness of the formed plastic sheet/tube and also reducing surface defects.

The foregoing and other objects, features, and advantages of the invention will be apparent from the

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figures 3 and 4, a first preferred embodiment of the mold 2 for casting a rubber sheet of the present invention comprises a first mold 21 having a substantially flat shape, and a first spaced apart from the first mold 21 and having a substantially flat shape. a molding unit 23 disposed between the first mold 21 and the second mold 22, and a plurality of clamps 24 for clamping the first mold 21, the second mold 22 and the molding unit 23 . In the preferred embodiment, the clamp 24 is a C-clip. Of course, in practical applications, the clamp 24 can also be a G-clip, a ㄇ clip, a long tail clip, a spring clip, or other clips. The type of the first mold 21, the second mold 22, and the molding unit 23 is not limited by the disclosure of the embodiment.

The molding unit 23 includes a rigid outer frame 231 disposed between the first die 21 and the second die 22, and is disposed on the inner side of the rigid outer frame 231. The expandable frame 232, the first die 21, the second die 22 and the expandable frame 232 cooperate to define a filling space 25.

The material of the rigid outer frame 231 may be metal, glass, ceramic, polymer, wood, composite material or a combination thereof, and the expandable frame 232 may be an elastic tube or a foam material. In the embodiment, the rigid outer frame 231 is made of a metal material, and the expandable frame 232 is an inflatable tube.

Referring to Figure 5, a preferred embodiment of the method of casting an injection molded sheet of the present invention comprises a preparation step 31, a casting step 32, a forming step 33, and a take-out step 34.

The present embodiment is carried out by using the preferred embodiment of the mold 2 described above. Therefore, the device structure described in the embodiment is a preferred embodiment of the mold 2, and therefore will not be described herein.

Referring to Figures 5, 6, and 7, for convenience of explanation, a part of the member is omitted in Fig. 7. When the rubber sheet is to be poured, the preparation step 31 is first performed, and the molding unit 23 is clamped by the clamp 24 to be located in the first mold. 21 is between the second mold 22; next, the pouring step 32 is performed to inject the plastic slurry 200 into the filling space 25.

Then, the molding step 33 is performed, and the first mold 21 and the second mold 22 are pressed by the clamp 24 and the expandable frame 232 is expanded, due to the upper, lower and outer sides of the expandable frame 232. Restricted by the first and second molds 21, 22 and the rigid outer frame 231, respectively, the expandable frame 232 can only expand laterally toward the direction of the plastic slurry 200 as shown in FIG. 7, and the plastic slurry in the filling space 25. Material 200 is applied as indicated by arrow 41 in FIG. Lateral pressure.

It is known that when the plastic slurry 200 is solidified and molded, volume shrinkage occurs in a three-dimensional direction, and the lateral pressure generated by the lateral expansion of the expandable frame 232 toward the plastic slurry 200 can force the plastic paste 200 to solidify. The amount of lateral shrinkage indicated by the arrow 42 in FIG. 7 during molding replaces the amount of longitudinal shrinkage that the plastic paste 200 may have along the height direction of the rigid outer frame 231, thereby controlling the thickness of the cast plastic sheet. It is nearly equal to the thickness of the rigid outer frame 231.

In addition, since the lateral contraction amount is the contraction amount in the two-dimensional direction, and the longitudinal contraction amount is the one-dimensional contraction amount, the expansion amount of the expandable frame body 232 is only 20% larger than the contraction amount of the plastic slurry 200 during molding. That is, the plastic paste 200 can be subjected to lateral pressure during solidification molding, and thus the amount of longitudinal shrinkage is replaced by the amount of lateral shrinkage, so that the cast plastic sheet has a relatively uniform thickness. Finally, the removing step 34 is performed, and the cured plastic slurry 200 is taken out from the filling space 25 to obtain a plastic plate having a uniform thickness.

Referring to FIGS. 8 and 9, if a gap T is formed between the clamp 24 and the first die 21, the expansion of the expandable frame 232 can not only support the upper and second molds 21 and 22 to be removed. The gap T can also apply lateral pressure to the plastic paste 200 in the filling space 25 to obtain a plastic sheet having a uniform thickness and a thickness greater than the thickness of the rigid outer frame 231.

Of course, in addition to the manners shown in FIGS. 8 and 9, the expandable frame 232 may be disposed on the first die 21 and the rigid frame 231, or the second, as shown in FIGS. Between the die 22 and the rigid outer frame 231 The expanded volume of the expandable frame 232 can be used to apply a lateral pressure to the plastic slurry 200 in the filling space 25 to obtain a plastic plate having a uniform thickness and a thickness greater than the thickness of the rigid outer frame 231.

Referring to Figure 12, a second preferred embodiment of the mold 2 for casting a rubber sheet of the present invention is substantially similar to the first preferred embodiment, except that the molding unit 23 includes only the expandable frame. 232.

Since the preferred embodiment is substantially the same as the first preferred embodiment, in addition to the same effect as the first preferred embodiment, the rigid outer frame 231 (shown in FIG. 6) is reduced. Not only can it effectively reduce costs, but it can also reduce the overall weight for easy transportation.

Referring to FIG. 13, a third preferred embodiment of the mold 2 for casting a rubber sheet of the present invention is substantially similar to the first preferred embodiment. The difference is that the rigid outer frame 231 includes a first An outer frame 233 between a die 21 (shown in FIG. 6) and the second die 22 (shown in FIG. 6), and a push frame 234 that cooperates with the outer frame 233 to surround the expandable frame 232.

In the preferred embodiment, the push frame 234 can be controlled to move laterally relative to the U-shaped outer frame 233 with the opening toward the right to push the expandable frame 232 as shown by the arrow 43 in FIG. .

With the design of the push frame 234, the lateral volume of the filling space 25 can be effectively reduced, which facilitates the control of the plastic slurry 200 having a large shrinkage. It is to be noted that how to drive the push frame 234 to reciprocate relative to the outer frame 233 is not known in the prior art.

Referring to Figures 14 and 15, the mold 2 of the present invention for pouring a rubber hose A preferred embodiment includes a first tubular mold 21, a second mold 22 spaced apart from the first mold 21 and substantially tubular, and a first mold 21 and the second mold 22 disposed between the first mold 21 and the second mold 22. The molding unit 23 and the jig 24 that radially sandwich the first mold 21 and the second mold 22. In the preferred embodiment, the clamp 24 is locked to the flange of the first die 21 by a bolt diameter, so as to drive the first die 21 and the second die 22 to be axially oriented. Turn.

The molding unit 23 includes an expandable frame 232 disposed between the first die 21 and the second die 22, and the first die 21, the second die 22 and the expandable frame A 232 fit defines a tubular filling space 25.

Referring to FIG. 16, in practical application, the plastic slurry 200 is injected into the filling space 25, and the expandable frame 232 is expanded. When the expandable frame 232 is inflated, the first and second molds 21 are respectively received. 22 and the limitation of the clamp 24, the expandable frame 232 can only axially expand toward the plastic slurry 200 as shown in FIG. 16, and apply axial pressure to the plastic slurry 200 in the filling space 25, forcing The plastic slurry 200 in the filling space 25 is replaced by the amount of axial shrinkage along the length direction of the first and second molds 21, 22 instead of the distance between the plastic paste 200 and the first and second molds 21 and 22. The radial contraction amount can not only control the thickness of the plastic tube which is cast to be nearly equal to the spacing between the first and second molds 21 and 22, so that the thickness of the plastic tube is more precise, and the subsequent inner and outer diameters can be eliminated. The cutting process greatly shortens the manufacturing time of the plastic tube while reducing defects in the inner and outer surfaces of the plastic tube.

Referring to Figure 17, a second preferred embodiment of the mold 2 for casting a hose of the present invention is substantially the first one of the mold 2 for pouring the hose. The preferred embodiment is similar in that the molding unit 23 includes two expandable frames 232 that are annularly disposed between the first mold 21 and the second mold 22.

Since the preferred embodiment is substantially similar to the first preferred embodiment of the mold 2 for casting a hose, it can be produced in the same manner as the first preferred embodiment of the mold 2 for casting a hose. In addition, the use of the two-phase spaced expandable frame 232 can force the plastic slurry 200 in the filling space 25 to produce a greater amount of axial shrinkage, which not only enables the thickness of the cast plastic tube to be more uniform, It can also reduce defects on the inner and outer surfaces of the plastic tube.

Referring to Figure 18, a third preferred embodiment of the mold 2 for casting a hose of the present invention is substantially similar to the first preferred embodiment of the mold 2 for casting a hose, the difference being that the The jig 24 is annular in correspondence with the distance between the first die 21 and the second die 22, and is radially locked to the first die 21 and the second die 22 by bolts. This provides another embodiment for the user to choose.

In summary, the method for casting a rubber sheet/tube mold 2 and a method for pouring an injection rubber sheet/tube, the first mold 21 and the second mold 22 are used to restrict the expandable frame 232 to make the expandable The frame 232 is laterally expanded to apply lateral pressure to the plastic slurry 200 in the filling space 25, so that the plastic slurry 200 can be formed into a lateral shrinkage amount instead of the shrinkage amount in the thickness direction, thereby ensuring the molding. The thickness of the plastic sheet/tube is more uniform, so that the object of the present invention can be achieved.

However, the above is only the preferred embodiment of the present invention, when not The scope of the invention is to be construed as being limited by the scope of the invention and the scope of the invention.

2‧‧‧Mold

21‧‧‧ first model

22‧‧‧ second mode

23‧‧‧Molding unit

231‧‧‧Rigid frame

232‧‧‧Expandable frame

233‧‧‧External framework

234‧‧‧ push frame

24‧‧‧Clamp

25‧‧‧filling space

200‧‧‧Plastic slurry

31‧‧‧Preparation steps

32‧‧‧ pouring steps

33‧‧‧Molding steps

34‧‧‧ removal steps

41~43‧‧‧ arrow

T‧‧‧ gap

Figure 1 is a cross-sectional view showing the mold of the invention patent of the Republic of China Announcement No. I253976 "Method for manufacturing a mold for a plastic sheet and a method for manufacturing a plastic sheet"; Fig. 2 is a side view showing the mold made of the mold of Fig. 1. FIG. 3 is an exploded perspective view showing a first preferred embodiment of the mold for casting a rubber sheet according to the present invention; FIG. 4 is a cross-sectional view, and FIG. 3 is a supplementary view; FIG. 5 is a flow chart illustrating the present invention. A preferred embodiment of the method for injecting an injection molded rubber sheet; FIG. 6 is a cross-sectional view showing the effect of the expandable frame of the first preferred embodiment on the plastic slurry when expanded; FIG. 7 is a top plan view, and FIG. 8 and 9 are cross-sectional views illustrating the state in which the expandable frame of the first preferred embodiment is larger than the rigid frame after expansion; FIGS. 10 and 11 are cross-sectional views showing that the expandable frame may also be interposed therebetween. Between the rigid outer frame and the first mold or the second mold; FIG. 12 is a cross-sectional view showing a second preferred embodiment of the mold for casting the rubber sheet of the present invention; FIG. 13 is a plan view showing the present invention for pouring Plastic plate mould The third preferred embodiment; FIG. 14 is a side elevational view showing the first and second modes of the first preferred embodiment of the mold for casting a plastic tube of the present invention; FIG. 15 is a FIG. 16 is a cross-sectional view showing the application of the first preferred embodiment of the mold for pouring a rubber tube of the present invention; and FIG. 17 is a cross-sectional view showing the mold for pouring the rubber tube of the present invention. A second preferred embodiment; and Figure 18 is a cross-sectional view showing a third preferred embodiment of the mold for casting a hose of the present invention.

2‧‧‧Mold

21‧‧‧ first model

22‧‧‧ second mode

23‧‧‧Molding unit

231‧‧‧Rigid frame

232‧‧‧Expandable frame

24‧‧‧Clamp

Claims (10)

A mold for pouring a rubber sheet/tube, comprising: a first mold; a second mold spaced apart from the first mold; and a molding unit including a first mold and the second mold An expandable frame body, and a filling space defined by the first mold, the second mold and the expandable frame body for filling the plastic slurry, the expandable frame body being expandably controlled to The plastic slurry in the filling space applies lateral pressure. The mold for pouring a rubber sheet/tube according to the first aspect of the invention, wherein the molding unit further comprises a rigid outer frame disposed between the first mold and the second mold. A mold for pouring a rubber sheet/tube according to the second aspect of the patent application, wherein the rigid outer frame of the molding unit surrounds the expandable frame. A mold for casting a rubber sheet/tube according to claim 3, wherein the rigid outer frame includes an outer frame disposed between the first mold and the second mold, and an outer frame A push frame that cooperates to surround the expandable frame, wherein the push frame is controllably movable laterally relative to the outer frame to urge the expandable frame. The mold for casting a rubber sheet/tube according to the second aspect of the patent application, wherein the expandable frame is disposed between the rigid outer frame and the first mold or the second mold. The mold for pouring a rubber sheet/tube according to any one of claims 1 to 5, wherein the expandable frame is selected from an elastic tube body or Foaming material. The mold for pouring a rubber sheet/tube according to the first aspect of the patent application, wherein the expandable frame has an expansion amount greater than 20% of the plastic slurry molding shrinkage amount. The mold for pouring a rubber sheet/tube according to the second aspect of the patent application, wherein the rigid outer frame is made of a metal, glass, ceramic, polymer, wood, composite material or a combination thereof. The mold for pouring the rubber sheet/tube according to the first aspect of the patent application also includes a plurality of clamps for restraining the first mold, the second mold, and the molding unit. A method for casting a rubber sheet/tube using the mold described in claim 1 of the patent application, comprising: a preparation step of forming a molding unit clip between the first mold and the second mold by using a jig; a step of injecting a plastic slurry into the filling space; a molding step of applying pressure to the first mold and the second mold by using the clamp and expanding the expandable frame, using the first mold and the second mold Limiting the expandable frame to generate lateral expansion to apply lateral pressure to the plastic slurry in the filling space; and a removing step of removing the cured plastic slurry from the filling space to obtain a predetermined thickness Plastic plate / tube.