TWI408043B - Injection mold - Google Patents

Abstract

The present invention relates to a injection mold, especial an injection mold that can remove the injection part of a plastic produce manufactured using the same. The injection mold includes a fixed half, a moving half, and an outpush mean. The fixed half coordinates with the moving half to form a cavity. The moving half includes an injection channel. This injection channel connects to the cavity. The outpush mean includes an outpush pin. The outpush pin gets through the moving mold, reaches the cavity and adjacent to the injection channel. The outpush pin includes a cornu. The cornu is disposed adjacent to the injection channel. The cornu build up the stress of the connecting point of the plastic produce and the injection part of a plastic produce. This injection mold can cut down the cost of manufacturing plastic produces.

Description

Injection mold

The present invention relates to an injection mold, and more particularly to an injection mold that can automatically remove a nozzle.

Mold is an indispensable tool in injection molding. The injection molding system injects the hot-melt plastic material into the sealed cavity with the desired shape at a high speed. After the plastic material is cooled and solidified, the mold is opened and the cured plastic product is ejected to obtain a processing method of the molded product. Because the injection molding processing method has the characteristics of low molding cost, short molding cycle, simple molding process and easy plastic molding of complex shapes, it is widely used in the application of plastic products.

Please refer to FIG. 1 , which is a cross-sectional structural diagram of a prior art injection mold clamping state. The injection mold 1 includes a mold 11, a movable mold 12, a mold frame 13, and an ejection mechanism 14. The mold frame 13 is used to support the fixed mold 11, the movable mold 12 and the ejection mechanism 14. The fixed mold 11 is provided with a fixed mold 111. The movable mold 12 is provided with a movable mold core 121. When the mold is closed, the fixed mold 11 and the movable mold 12 are attached to each other, and the fixed mold 111 and the movable mold core 121 together form a closed cavity 151 to form an injection molded product. The ejection mechanism 14 includes a ejector plate 141 and a plurality of thimbles 142. The thimble 142 is fixed to the ejector plate 141 and is pushed out by the ejector plate 141. The ejecting mechanism 14 lifts the cooled molded plastic product away from the movable mold core 121 when the mold 1 is opened, thereby demolding the product. In order to make the surface of the injection molded product adjacent to the fixed mold 11 smooth and beautiful, a nozzle 152 for flowing the hot-melt plastic material in a parallel ejection direction is generally formed in the movable mold core 121. The hot melted plastic material enters the closed cavity 151 from the runner 153 through the nozzle 152.

Please refer to FIG. 2 at the same time, which is a schematic cross-sectional structural view of the injection mold 1 shown in FIG. When the mold is opened, the fixed mold 11 is separated from the movable mold 12, and the plurality of thimbles 142 are driven by the ejector pin 141 to solidify the plastic product solidified in the closed cavity 151 together with the nozzle (not labeled) formed in the nozzle 152. Same as the top.

However, the plastic product molded by the injection molding die 1 of the prior art is still connected to the nozzle. Since the nozzle is not part of the plastic product, in the subsequent process, the nozzle must be removed by manual removal or other mechanical equipment to remove the nozzle. However, whether it is manual or other mechanical equipment for secondary processing to remove the nozzle, it will waste the manpower of plastic product production, increase the processing process and cost of plastic products, and prolong the production cycle of plastic products, thus reducing the production efficiency of plastic products.

In view of this, it is necessary to provide an injection mold having a high production efficiency of a plastic product.

An injection mold comprising a certain mold; an ejection mechanism comprising a demolding thimble and a nozzle ejector, the demolding ejector acting prior to the apex of the nozzle; and a movable mold cooperating with the stationary mold to form a molded closed type a movable cavity comprising: a nozzleway connected to the shaped closed cavity; wherein the demolding thimble extends through the movable die to the closed cavity and adjacent to the nozzle, the demolding thimble passes through the movable die Extending into the closed cavity and adjacent to the nozzle, the one end of the stripping thimble extends through the movable mold to the closed cavity and adjacent to the nozzle, and the stripper is provided with a sharp corner adjacent to the nozzle. The sharp corners form a sharp-angled depression between the nozzle and the closed cavity, and the sharp-angled depression concentrates the stress of the plastic product formed in the closed cavity with the nozzle in the nozzle.

An injection mold comprising a certain film having a certain model cavity surface; a demolding thimble; a nozzle thimble; a sprue thimble; and a movable mold comprising: a movable model cavity surface; and a nozzleway connecting the The mold cavity surface; wherein the mold release thiper extends through the movable mold to the surface of the movable mold cavity and adjacent to the water passage, the sharp angle protrudes to the water passage, and the fixed mold and the movable mold are combined to form a closed type a cavity, the surface of the movable mold cavity forms a runner with the surface of the fixed mold cavity, the ejector pin moves before the ejector pin, and one end of the runner thimble extends through the movable die to the runner, Stripping top One end of the needle extends through the movable mold and extends to the closed cavity adjacent to the nozzle. The end has a sharp corner which forms a sharp corner recess at the junction of the nozzle and the closed cavity.

Compared to the prior art, the demolding ejector of the injection mold of the present invention has a sharp corner near the nozzle. The demolding thimble removes the nozzle of the plastic product when the plastic product is demolded, thereby saving the manpower of the plastic product production, reducing the processing procedure and cost of the plastic product, and shortening the production cycle of the plastic product. Therefore, the production efficiency of plastic products is improved.

Please refer to FIG. 3 and FIG. 4. FIG. 3 is a schematic cross-sectional structural view showing the mold clamping state of the present invention. Fig. 4 is a partially enlarged schematic view showing the cross-sectional structure of the injection mold shown in Fig. 3. The injection mold 2 includes a mold 21, a movable mold 22, a mold frame 23, and an ejection mechanism 24. The mold frame 23 is used to support the fixed mold 21, the movable mold 22, and the ejecting mechanism 24. The fixed mold 21 is attached to the movable mold 22 to form a closed cavity 25 having a fixed shape. The ejecting mechanism 24 is disposed between the mold frame 23 and the movable mold 22 and partially passes through the movable mold 22 to the closed cavity 25.

The fixed mold 21 includes a fixed mold frame 211, a fixed mold core 212, and a casting channel system 213. The fixed frame 211 includes a receiving frame 214. The fixed mold core 212 is embedded in the receiving frame 214. The surface of the fixed mold 212 facing the movable mold 22 is a molding surface. The forming surface includes a fixed mold cavity surface 215 and a fixed mold runner surface 216. The casting channel system 213 extends through the fixed mold frame 211 and the fixed mold core 212 and communicates with the fixed mold runner surface 216.

The movable mold 22 includes a movable mold frame 221 and a movable mold core 222. The movable mold core 222 is embedded in the movable mold frame 221. The movable mold core 222 includes a movable mold cavity surface 223, a movable mold runner surface 224, and a water passage 225. The movable mold cavity surface 223 and the fixed mold cavity surface 215 of the fixed mold 21 form the closed cavity 25 having a fixed shape. The mandrel runner surface 224 and the fixed gate runner surface 216 of the stationary mold 21 form a runner 26 of the injection mold 2. The runner 26 is in communication with the sprue system 213. The nozzle 225 is composed of the movable mold The cavity surface 223 extends into the conduit formed inside the movable mold core 222. One end of the nozzle 225 communicates with the closed cavity 25, and the other end communicates with the runner 26.

The ejecting mechanism 24 includes a first ejecting plate 241, a second ejecting plate 242, a stripping ejector 243, a spigot 244, and a sprue thimble 245. One end of the nozzle ejector 244 is fixed to the second ejector plate 242 by a countersunk head 249, and the other end thereof extends through the movable mold 22 to the nozzle 225. One end of the runner thimble 245 is also fixed to the first ejector plate 241 by a countersunk head 249, and the other end thereof extends through the movable mold 22 to the runner 225. One end of the stripping ejector 243 is also connected to the first ejector plate 241 by a countersunk head 249, and the other end thereof extends through the movable mold 22 to the closed cavity 25 and adjacent to the nozzle 225. The stripping ejector 243 is provided with a sharp corner 248 adjacent to the nozzle 225. The sharp corner 248 projects to the nozzle 225 and causes the nozzle 225 to form a sharp corner at the junction with the closed cavity 25.

When the injection mold 2 is injection molded, the injection mold 2 is closed, and a hot-melt plastic material is injected from the casting system 213, and flows into the sealed cavity 25 through the runner 26 and the nozzle 225. After the plastic material in the sealed cavity 25 is cooled and solidified, a plastic product 28 is formed in the sealed cavity 25 of the injection mold 2. The plastic material solidified in the nozzle 225 forms a nozzle 27. However, due to the action of protruding angle 248 from the stripping ejector 243 to the junction of the nozzle 225 and the closed cavity 25, the nozzle 27 forms a sharp-angle recess 29 at the junction with the plastic product 28.

Please refer to FIG. 5 and FIG. 6 at the same time. FIG. 5 is a schematic cross-sectional structural view of the injection mold 2 shown in FIG. 3; FIG. 6 is a process diagram of the automatic removal of the nozzle 27 by the injection mold 2 shown in FIG. To remove the plastic product 28, the fixed mold 21 is separated from the movable mold 22, and the first ejector plate 241 of the ejector mechanism 24 is actuated. The ejector pin 243 pushes the plastic product 28 away from the movable mold 22, and The nozzle 27 has an adhesive force with the nozzle 225. This adhesion causes the nozzle 27 to have a tendency to remain in the nozzle 225. Thus, a mutual pulling force is formed between the plastic product 28 and the nozzle 27. Under the action of the pulling force, the tip of the nozzle 27 is at the junction with the plastic product 28 The angular depression 29 is most concentrated due to the smallest radius of curvature thereof, and therefore, the pointed depression 29 is broken by the tensile force. The rupture continues to stretch under the continuation of the pulling force, and finally the connection of the entire nozzle 27 to the plastic product 28 is broken, and the nozzle 27 is detached from the plastic product 28. Finally, the second ejector plate 242 acts to push the nozzle thimble 244 to demold the nozzle 27.

Compared to the prior art, the injection mold 2 of the present invention is provided with a sharp corner 248 by the release thimble 243 near the nozzle 27. The sharp corner 248 protrudes to the nozzle 225, and a sharp corner is formed at the junction of the nozzle 225 and the closed cavity 25, so that the nozzle 27 protrudes due to the sharp corner when the plastic product 28 is demolded. The sharp corner depression is concentrated and pulled off, thereby being removed from the plastic product 28, thereby saving the manpower of the plastic product 28, reducing the processing steps and costs of the plastic product 28, and shortening the production cycle of the plastic product 28 . This increases production efficiency.

Please refer to FIG. 7 and FIG. 8. FIG. 7 is a schematic cross-sectional structural view of a second embodiment of the injection mold of the present invention. Fig. 8 is a partially enlarged schematic view showing the cross-sectional structure of the injection mold shown in Fig. 7. The injection mold 3 of the second embodiment is substantially the same as the injection mold 2, except that the first ejection plate 341 includes a slide 346 and a slider 347 disposed on the slide 346. When the stripping ejector pin 343 is a slanting thimble, the direction of movement of the stripping ejector pin 343 is at an angle α with the stripping direction of the product. The stripper 343 is connected at one end to the slider 347. The other end of the stripping ejector 343 extends through the movable mold 32 to the closed cavity 35 and adjacent to the nozzle 325. The stripping ejector 343 is adjacent to the sharp corner 348 disposed at the nozzle 325.

When the plastic product 38 is demolded, the nozzle 37 is subjected to the breaking force of the movable mold core 322; at the same time, the sharp corner 348 is cut by the oblique ejection movement of the stripping ejector 243, thereby cutting the nozzle 37, thereby ensuring that the nozzle 37 is cut. The nozzle 37 is separated from the plastic product 38 to prevent the plastic product 38 from being plastically deformed by a large pulling force, thereby improving the yield of the plastic product 38. In order to obtain a better demolding and water removal effect 37, the demolding thimble 343 and the plastic 38 The angle α of the stripping direction of the product is between 10 and 30 degrees, preferably 15 degrees, so that the cutting is labor-saving and the volume of the injection mold 3 is small.

However, the present invention is not limited to the above embodiments. For example, the injection mold 2 further includes a plurality of nozzles 225 and corresponding plurality of stripping thimbles 243; the first ejector plate 341 may not include the sliders 347. The die thimble 343 is directly slidably coupled to the slide 346. The above-described simple deformation of the injection mold 2 applicable to the first embodiment is also applicable to the injection mold 3 of the second embodiment.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application.

2, 3‧‧‧ injection mold

211‧‧ ‧ fixed frame

213‧‧‧casting system

215‧‧ ‧ model cavity surface

22, 32‧‧‧moving

222, 322‧‧‧moving

224‧‧‧Manipulator runner surface

23‧‧‧Model frame

241‧‧‧First top board

243, 343‧‧ ‧ release thimble

245‧‧‧Spinner thimble

25, 35‧‧‧ Closed cavity

27, 37‧‧ ‧ spout

248, 348‧‧‧ sharp corner

346‧‧‧ slide

21‧‧ ‧ fixed mode

212‧‧‧ 定模仁

214‧‧‧Training frame

216‧‧ ‧ fixed mold runner surface

221‧‧‧Moving frame

223‧‧‧Dynamic cavity surface

225‧‧‧Waterway

24‧‧‧Out of the agency

242‧‧‧Second ejection board

244, 344‧‧ ‧ spigot

249, 349‧‧‧ Shentou

26‧‧‧Spinner

28, 38‧‧‧ plastic products

29‧‧‧ sharp corner depression

347‧‧‧ Slider

Fig. 1 is a schematic cross-sectional view showing a state in which a prior art injection mold is clamped.

2 is a schematic cross-sectional structural view showing the mold opening state of the injection mold shown in FIG. 1.

Fig. 3 is a schematic cross-sectional view showing the state in which the injection mold of the present invention is clamped.

Fig. 4 is a partially enlarged schematic view showing the cross-sectional structure of the injection mold shown in Fig. 3.

Fig. 5 is a schematic cross-sectional structural view showing the mold opening state of the injection mold shown in Fig. 3.

Figure 6 is a process diagram of the automatic removal of the nozzle of the injection mold shown in Figure 5.

Figure 7 is a schematic cross-sectional view showing a second embodiment of the injection mold of the present invention.

Fig. 8 is a partially enlarged schematic view showing the cross-sectional structure of the injection mold shown in Fig. 7.

2‧‧‧Injection mould

211‧‧ ‧ fixed frame

213‧‧‧casting system

215‧‧ ‧ model cavity surface

22‧‧‧moving

222‧‧‧moving

224‧‧‧Manipulator runner surface

23‧‧‧Model frame

241‧‧‧First top board

243‧‧‧Release thimble

245‧‧‧Spinner thimble

25‧‧‧Closed cavity

21‧‧ ‧ fixed mode

212‧‧‧ 定模仁

214‧‧‧Training frame

216‧‧ ‧ fixed mold runner surface

221‧‧‧Moving frame

223‧‧‧Dynamic cavity surface

225‧‧‧Waterway

24‧‧‧Out of the agency

242‧‧‧Second ejection board

244‧‧‧Water thimble

249‧‧‧Shentou

26‧‧‧Spinner

Claims (18)

An injection mold comprising: a certain film having a certain model cavity surface; a demolding thimble; a nozzle thimble; a sprue thimble; and a movable mold comprising: a movable model cavity surface; and a water channel, the connection The movable mold cavity surface; wherein the demolding thimble extends through the movable mold to the surface of the movable mold cavity and adjacent to the water passage, the sharp angle protrudes to the water passage, and the fixed mold and the movable mold are combined to form a closed seal a cavity, the surface of the movable mold cavity forms a runner with the surface of the fixed mold cavity, the ejector pin moves before the ejector pin, and one end of the sprue thimble extends through the movable die to the runner. One end of the demolding thimble extends through the movable mold to the closed cavity and adjacent to the nozzle, the end having a sharp corner, the sharp angle forming a tip at the junction of the nozzle and the closed cavity Corner depression. The injection mold according to claim 1, wherein the mold release thimble is a slanting thimble, and the sharp corner of the water passage is a blade. The injection mold of claim 2, wherein the injection mold further comprises a first ejector plate, the first ejector plate driving the release ejector pin and the sprue thimble. The injection mold of claim 3, wherein the first ejector plate comprises a slide and a slider disposed on the slide, the release ejector being fixed to the slider. The injection mold of claim 3, wherein the first ejector plate comprises a slide, the release ejector being slidably coupled to the slide. The injection mold according to any one of claims 4 to 5, wherein the injection mold further comprises a second ejector plate, the nozzle thimble being fixed to the second ejector plate. The injection mold of claim 6, wherein the first ejector plate acts prior to the second ejector plate. The injection mold according to any one of claims 2 to 5, wherein the stripping thimble and the plastic product molded by the injection mold have an angle of between 10 and 30 degrees. The injection mold according to claim 8, wherein the mold release thimble has an angle of 15 degrees from a mold release direction of the plastic product molded by the injection mold. An injection mold comprising: a mold; an ejection mechanism comprising a mold release thimble and a nozzle ejector, the mold release ejector acting prior to the ejector pin; and a movable mold that cooperates with the fixed mold to form a molded seal a movable cavity comprising: a nozzleway connecting the shaped closed cavity; wherein the demolding thimble extends through the movable die to the closed cavity and adjacent to the nozzle, and one end of the stripping thimble passes through The movable mold extends to the closed cavity and is adjacent to the water channel. The stripping ejector is disposed adjacent to the water channel with a sharp corner, and the sharp angle forms a sharp angle between the nozzle and the closed cavity. The depression, which causes stress concentration of the plastic product formed in the closed cavity and the junction of the nozzle in the nozzle. The injection mold according to claim 10, wherein the mold release thimble is a slanting thimble, and the sharp corner of the water passage is a blade. The injection mold of claim 11, wherein the injection mold further comprises a first ejection plate, the first ejection plate driving the ejection ejector. The injection mold of claim 12, wherein the first ejector plate comprises a slide and a slider disposed on the slide, the release ejector being fixed to the slider. An injection mold according to claim 12, wherein the first A ejector plate includes a slide that is slidably coupled to the slide. The injection mold according to any one of the preceding claims, wherein the injection mold further comprises a second ejector plate, the nozzle thimble being fixed to the second ejector plate. The injection mold of claim 15, wherein the first ejector plate moves before the second ejector plate. The injection mold according to any one of claims 11 to 14, wherein the stripping ejector is at an angle of between 10 and 30 degrees from the stripping direction of the plastic product molded by the injection mold. The injection mold according to claim 17, wherein the mold release thimble has an angle of 15 degrees from a mold release direction of the plastic product molded by the injection mold.