CN219055151U - Mould for evaluating deformation of cylinder - Google Patents

Abstract

The utility model relates to the technical field of polymer injection molding, and discloses a die for evaluating deformation of a cylinder, which comprises the following components: the mold comprises a mold body, a main runner, at least more than two diversion runners and at least more than two pouring gates; the die comprises a die body, a main runner, a die cavity and a die, wherein a cylindrical die cavity for forming a cylinder is arranged in the die body, the central axis of the die cavity is parallel to the front side surface of the die, the main runner is arranged in the die body, the first end of the main runner is communicated to the front side surface of the die body, and the second end of the main runner is positioned above the top end of the die cavity; the pouring gates are arranged at the top end of the die cavity, and the pouring gates are uniformly distributed on the peripheral wall of the die cavity; the main runner and the pouring gates are communicated in one-to-one correspondence through the split runners, and each split runner is provided with a throttle valve. The utility model can evaluate the influence of different pouring gate schemes on the deformation of the hollow cylinder and compare the deformation of the hollow cylinder when different materials are injected.

Description

Mould for evaluating deformation of cylinder

Technical Field

The utility model relates to the technical field of polymer injection molding, in particular to a die for evaluating deformation of a cylinder.

Background

Product deformation is a very common problem in the polymer injection molding field, and there are many factors affecting warp deformation, such as materials, molds, process parameters, product structure, and the like. Among them, the deformation of a hollow cylinder is common in the deformation of an injection-molded article, and the deformation thereof is sometimes a cylinder bending, sometimes a cylinder with insufficient cross-sectional roundness, and the like.

At present, the structure of the mold has the main influences on the buckling deformation of the hollow cylinder, such as a pouring process, a cooling process, an ejection process and the like, and the pouring process has the influence factors including the positions and the number of the pouring gates, wherein the pouring gates are closely related to the flow ratio of plastics, the molding shrinkage rate of products and other factors, and the design of an injection mold of the hollow cylinder is needed to be particularly used for evaluating the influence of different pouring gate schemes on the deformation of the hollow cylinder and transversely comparing the deformation conditions of the products in injection molding of different materials.

Disclosure of Invention

The purpose of the utility model is that: an injection mold is designed that can evaluate the effect of different gate schemes on deformation of a hollow cylinder.

In order to achieve the above object, the present utility model provides a mold for evaluating deformation of a cylinder, comprising: the mold comprises a mold body, a main runner, at least more than two diversion runners and at least more than two pouring gates;

the die comprises a die body, a main runner, a die cavity and a die, wherein a cylindrical die cavity for forming a cylinder is arranged in the die body, the central axis of the die cavity is parallel to the front side surface of the die, the main runner is arranged in the die body, the first end of the main runner is communicated to the front side surface of the die body, and the second end of the main runner is positioned above the top end of the die cavity;

the pouring gates are arranged at the top end of the die cavity, and the pouring gates are uniformly distributed on the peripheral wall of the die cavity;

the main runner and the pouring gates are communicated in one-to-one correspondence through the split runners, and each split runner is provided with a throttle valve.

Preferably, the second end of the primary runner is located on the central axis of the mold cavity.

Preferably, the split runner comprises a primary runner and a secondary runner which are communicated with each other, the primary runner is communicated with the second end of the main runner and is perpendicular to the central axis of the die cavity, and the secondary runner is communicated with the pouring gate and is parallel to the central axis of the die cavity.

Preferably, the length of the die cavity is 100-1000 mm.

Preferably, the ratio of the length of the cavity to the diameter of the inner peripheral wall of the cavity is 25 to 50.

Preferably, the ratio of the length of the mould cavity to the wall thickness of the mould cavity is 50-100.

Preferably, the die body comprises a front die and a rear die which are sequentially abutted, the longitudinal section of the die cavity passing through the central axis is divided into a front cavity and a rear cavity, the front cavity is positioned at the rear side of the front die, and the rear cavity is positioned at the front side of the rear die.

Preferably, the mold further comprises a push rod, a through groove which is matched with the push rod and communicated with the rear cavity is formed in the rear side face of the rear mold, and the push rod is movably arranged in the through groove.

Preferably, the front fixing plate is attached to the front side surface of the front die, the rear fixing plate is attached to the rear side surface of the rear die, a conical injection molding channel with gradually smaller diameter from front to rear is formed in the front fixing plate, and the rear end of the conical injection molding channel is communicated with the first end of the main flow channel.

Preferably, the throttle valve comprises a blocking block and a valve cavity, the blocking block comprises a conical adjusting front end and a cylindrical blocking rear end, the valve cavity is arranged at the communication position of the primary runner and the secondary runner, the blocking block is in sliding connection with the shunt runner through the valve cavity, and the adjusting front end of the blocking block is positioned at the communication position of the primary runner and the secondary runner.

Compared with the prior art, the die for evaluating the deformation of the cylinder has the beneficial effects that:

the mold for evaluating the deformation of the cylinder is provided with the plurality of evenly distributed pouring gates, raw materials flow into the mold cavity through the main runner flow, the sub runners and the pouring gates during injection molding, the throttle valve on the sub runners can be used for forming the cylinder by using a plurality of different pouring gate schemes in the same mold, so that the influence of other variables on the deformation of the hollow cylinder by evaluating different pouring gate schemes is eliminated, and the influence on the deformation of the cylinder during injection molding by adopting different raw materials can be transversely compared.

Drawings

FIG. 1 is a top view of a mold for evaluating deformation of a cylinder according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view taken along the direction A-A in FIG. 1;

FIG. 3 is an isometric view of a mold for evaluating deformation of a cylinder according to an embodiment of the utility model;

FIG. 4 is an enlarged schematic view at B in FIG. 3;

FIG. 5 is an exploded view of a mold for evaluating deformation of a cylinder and a cylinder at injection molding according to an embodiment of the present utility model;

FIG. 6 is a left side view of a rear mold of a mold for evaluating deformation of a cylinder according to an embodiment of the present utility model;

FIG. 7 is an enlarged schematic view of FIG. 5C when the block blocks the sub-flow path;

FIG. 8 is an enlarged schematic view of FIG. 5C when the block does not block the subchannel;

fig. 9 is an isometric view of a hollow cylinder injection molded from a mold according to an embodiment of the present utility model.

In the figure, 1, a die body; 11. a front mold; 12. a rear mold; 121. a through groove; 2. a main flow passage; 3. a sub-runner; 31. a primary flow channel; 32. a secondary flow path; 4. a gate; 5. a mold cavity; 51. a front cavity; 52. a rear cavity; 6. a hollow cylinder; 7. a throttle valve; 71. blocking; 711. adjusting the front end; 712. plugging the rear end; 72. a valve cavity; 8. a push rod; 91. a front fixing plate; 911. a conical injection molding channel; 92. and a rear fixing plate.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the present utility model are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that the terms "connected," "fixed," and the like are used in the present utility model in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; the mechanical connection can be realized, and the welding connection can be realized; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The terms "first", "second", etc. are used in the present utility model to describe various information, but the information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the utility model.

As shown in fig. 1 and 2, a mold for evaluating deformation of a cylinder according to a preferred embodiment of the present utility model includes: a die body 1, a main runner 2, at least two or more split runners 3, and at least two or more gates 4;

a cylindrical die cavity 5 for forming a cylinder is formed in the die body 1, a central axis of the die cavity 5 is arranged in parallel with the front side surface of the die, the main runner 2 is arranged in the die body 1, a first end of the main runner 2 is communicated to the front side surface of the die body 1, and a second end of the main runner 2 is positioned above the top end of the die cavity 5;

the pouring gates 4 are arranged at the top end of the die cavity 5, and the pouring gates 4 are uniformly distributed on the peripheral wall of the die cavity 5;

the main runner 2 is communicated with the pouring gates 4 in a one-to-one correspondence through the diversion runners 3, and each diversion runner 3 is provided with a throttle valve 7.

During injection molding, the mold body 1 can be vertically placed, namely, the central axis of the mold cavity 5 in the mold body 1 is mutually perpendicular to the horizontal plane, the main runner 2 is positioned above the top end of the mold cavity 5, raw materials enter the mold body 1 from the first end of the main runner 2 during injection molding, enter the mold cavity 5 through the sub runner 3 and the gate 4, and completely fill the mold cavity 5, even the sub runner 3 and the main runner 2 under the action of gravity and extrusion to ensure that each space in the mold cavity 5 is filled with the raw materials. The number of gates 4 used in injection molding of the hollow cylinder 6 and the corresponding positions of the gates 4 on the peripheral wall can be changed by controlling the throttle valve 7 on the runner 3, the deformation condition of the hollow cylinder 6 under the scheme of the gates 4 can be obtained by evaluating the product after injection molding, injection molding of different schemes of the gates 4 is changed, and the deformation condition of each hollow cylinder 6 is comprehensively evaluated to obtain the influence factors of the gates 4 on the deformation of the hollow cylinder 6. Meanwhile, the product deformation conditions of different raw materials in injection molding can be compared transversely by changing the injection molding of different raw materials.

Further, the second end of the main runner 2 is located on the central axis of the die cavity 5, so that the gates 4 are uniformly distributed on the peripheral wall of the die cavity 5, and meanwhile, the distribution runners 3 and the gates 4 are uniformly and symmetrically distributed along the central axis of the die cavity 5 in one-to-one correspondence, and the influence on product deformation caused by different lengths of the distribution runners 3 is reduced.

Further, as shown in fig. 3 and fig. 4, the split runner 3 includes a primary runner 31 and a secondary runner 32 that are mutually communicated, the primary runner 31 is communicated with the second end of the main runner 2 and is perpendicular to the central axis of the mold cavity 5, and the secondary runner 32 is communicated with the gate 4 and is parallel to the central axis of the mold cavity 5, so that the runners are mutually perpendicular, and the flow of raw materials, the manufacture of the mold and the demolding of the later products are facilitated.

Further, the length of the die cavity 5 is 100-1000 mm, so as to reduce or even eliminate the influence on deformation and deformation observation of the formed hollow cylinder 6 caused by too short or too long.

Further, the ratio of the length of the die cavity 5 to the diameter of the inner peripheral wall of the die cavity 5 is 25-50, so that the formed cylinder is ensured to have a certain hollowness, and the deformation condition of the cylinder is convenient to observe or measure.

Further, the ratio of the length of the die cavity 5 to the wall thickness of the die cavity 5 is 50-100, so that the influence on the evaluation result caused by the excessively thick or excessively thin hollow cylinder 6 after molding is avoided.

Further, the mold body 1 includes a front mold 11 and a rear mold 12 that are sequentially abutted from front to back, the mold cavity 5 is divided into a front cavity 51 and a rear cavity 52 along a longitudinal section passing through the central axis, the front cavity 51 is located at the rear side of the front mold 11, the rear cavity 52 is located at the front side of the rear mold 12, and the hollow cylinder 6 after being molded is separated from the mold cavity 5 through separation of the front mold 11 and the rear mold 12.

Further, the injection molding machine further comprises an ejector rod 8, the rear side surface of the rear mold 12 is provided with a through groove 121 which is matched with the ejector rod 8 and communicated with the rear cavity 52, the ejector rod 8 is movably arranged in the through groove 121, during injection molding, the ejector rod 8 is connected to the rear cavity 52 through the through groove 121, a gap between the rear cavity 52 and the through groove 121 is blocked, raw materials are prevented from leaking out of the through groove 121 during injection molding, and during demolding after injection molding, the molded hollow cylinder 6 can be ejected out through moving the ejector rod 8, so that demolding operation is facilitated.

Further, as shown in fig. 5, the front fixing plate 91 and the rear fixing plate 92 are further included, the front fixing plate 91 is attached to the front side surface of the front mold 11, the rear fixing plate 92 is attached to the rear side surface of the rear mold 12, the front fixing plate 91 is provided with a conical injection molding channel 911 with a gradually smaller diameter from front to rear, and the rear end of the conical injection molding channel 911 is communicated with the first end of the main channel 2. During injection molding, the front mold 11 and the rear mold 12 are tightly pressed by the front fixing plate 91 and the rear fixing plate 92, so that no gap exists in the mold cavity 5, and raw materials flow into the main channel from the conical injection channel 911.

Further, as shown in fig. 6, 7 and 8, the throttle valve 7 includes a block 71 and a valve cavity 72, the block 71 includes a conical adjusting front end 711 and a cylindrical blocking rear end 712, the valve cavity 72 is disposed at a communication position of the primary flow channel and the secondary flow channel, the block 71 is slidably connected with the flow dividing channel 3 through the valve cavity 72, and the adjusting front end 711 of the block 71 is disposed at a communication position of the primary flow channel 31 and the secondary flow channel 32. By sliding the block 71 in the flow dividing passage 3 and the valve cavity 72, the flow rate from the primary flow passage 31 to the secondary flow passage 32 can be controlled by changing the position of the conical adjusting front end 711 at the communication position of the primary flow passage 31 and the secondary flow passage 32; by sliding the cylindrical blocking rear end 712 of the blocking block 71 to the communication position between the primary runner 31 and the secondary runner 32, the corresponding gate 4 of the runner 3 can be blocked and completely closed.

In summary, the embodiment of the utility model provides a mold for evaluating deformation of a cylinder, which is provided with a plurality of evenly distributed pouring gates 4, raw materials flow into a mold cavity 5 through a main runner 2, a split runner 3 and the pouring gates 4 during injection molding, the cylinder can be conveniently and rapidly molded by using a plurality of different pouring gate 4 schemes in the same mold by using a throttle valve 7 on the split runner 3, so that influence of different pouring gate 4 schemes on deformation of the hollow cylinder 6 is eliminated, meanwhile, influence on deformation of the cylinder during injection molding by adopting different raw materials can be transversely compared, and the flow rate can be adjusted by adjusting the channel size of the split runner 3 through the throttle valve 7, so that deformation influence of injection molding of different pouring gate 4 schemes on the hollow cylinder 6 is more deeply studied.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims (10)

1. A die for evaluating deformation of a cylinder, comprising: the mold comprises a mold body, a main runner, at least more than two diversion runners and at least more than two pouring gates;

the die comprises a die body, a main runner, a die cavity and a die, wherein a cylindrical die cavity for forming a cylinder is arranged in the die body, the central axis of the die cavity is parallel to the front side surface of the die, the main runner is arranged in the die body, the first end of the main runner is communicated to the front side surface of the die body, and the second end of the main runner is positioned above the top end of the die cavity;

the pouring gates are arranged at the top end of the die cavity, and the pouring gates are uniformly distributed on the peripheral wall of the die cavity;

the main runner and the pouring gates are communicated in one-to-one correspondence through the split runners, and each split runner is provided with a throttle valve.

2. The mold for evaluating deformation of a cylinder of claim 1, wherein the second end of the primary runner is located on a central axis of the mold cavity.

3. The mold for evaluating deformation of a cylinder according to claim 1, wherein the flow dividing passage includes a primary flow passage and a secondary flow passage which are communicated with each other, the primary flow passage being communicated with the second end of the primary flow passage and being disposed perpendicularly to the central axis of the mold cavity, and the secondary flow passage being communicated with the gate and being disposed parallel to the central axis of the mold cavity.

4. The die for evaluating deformation of a cylinder according to claim 1, wherein the length of the die cavity is 100-1000 mm.

5. The mold for evaluating deformation of a cylinder according to claim 1, wherein a ratio of a length of the cavity to a diameter of an inner peripheral wall of the cavity is 25 to 50.

6. The die for evaluating deformation of a cylinder according to claim 1, wherein a ratio of a length of the die cavity to a wall thickness of the die cavity is 50 to 100.

7. The mold for evaluating deformation of a cylinder according to any one of claims 1 to 6, wherein the mold body comprises a front mold and a rear mold which are sequentially abutted, the mold cavity is divided into a front cavity and a rear cavity along a longitudinal section thereof passing through the central axis, the front cavity is located at a rear side of the front mold, and the rear cavity is located at a front side of the rear mold.

8. The mold for evaluating deformation of a cylinder according to claim 7, further comprising a push rod, wherein a through groove which is adapted to the push rod and is communicated to the rear cavity is formed in the rear side surface of the rear mold, and the push rod is movably installed in the through groove.

9. The die for evaluating deformation of a cylinder according to claim 8, further comprising a front fixing plate and a rear fixing plate, wherein the front fixing plate is attached to the front side surface of the front die, the rear fixing plate is attached to the rear side surface of the rear die, a conical injection molding channel with gradually smaller diameter from front to rear is formed in the front fixing plate, and the rear end of the conical injection molding channel is communicated with the first end of the main channel.

10. A die for evaluating deformation of a cylinder according to claim 3, wherein the throttle valve comprises a block and a valve cavity, the block comprises a conical adjusting front end and a cylindrical blocking rear end, the valve cavity is arranged at the communication position of the primary runner and the secondary runner, the block is in sliding connection with the split runner through the valve cavity, and the adjusting front end of the block is arranged at the communication position of the primary runner and the secondary runner.

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