A new type of structural casting die

Abstract

The invention discloses a new type of structure casting die, which includes: a die seat, a feed film port is arranged at the top of the die seat, a discharge die port is arranged at the bottom of the die seat, the discharge die port is a long strip hole structure extending left and right, a multi-stage flow channel connecting the feed film port and the discharge die port is arranged inside the die seat, the multi-stage flow channel is a flow channel structure of more than two stages arranged in sequence from top to bottom, and the multi-stage flow channel includes a first-stage flow channel connected to the feed film port and a last-stage flow channel connected to the discharge die port; wherein the first-stage flow channel is divided into two, becoming a second-stage flow channel in opposite directions; the last-stage flow channel is connected to the discharge die port through a gradually changing narrow flat flow channel extending left and right, and the last-stage flow channel is a cavity flow channel with a small top and a large bottom. It is easier to change the extrusion pressure of the melt in the die head, meet the requirements of equal pressure drop and isochronism, improve the uniformity of the melt, effectively improve the uniformity of the film extruded and formed by the discharge die port, and reduce the thickness deviation.

Description

Technical Field

[0001] The invention relates to a casting die, in particular to a casting die with a novel structure. Background Art

[0002] The cast film die is the core molding component of the cast film production equipment. Its function is to make the plastic melt from the extruder well distributed in the die flow channel so that it can be evenly extruded from the die at a certain speed and cooled and formed by the cooling roller to obtain a film product with uniform thickness.

[0003] However, the existing casting die still has some shortcomings. First, the melt distribution in the flow channel is not uniform enough; second, it cannot fully meet the requirement of equal pressure drop; third, it cannot meet the requirement of isochronism (the melt flowing out from any position stays in the die for the same time). The above shortcomings will lead to the uniformity of the extruded and formed film being not ideal, especially for films with a thickness of 0.1-0.3mm, resulting in material waste. Therefore, further improvement is needed. Summary of the invention

[0004] The purpose of the present invention is to provide a new structure casting die head to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.

[0005] The technical solutions adopted to solve the above technical problems are:

[0006] The present invention provides a novel structure casting die, which comprises: a die seat, a feed film port is arranged on the top of the die seat, a discharge die port is arranged on the bottom of the die seat, the discharge die port is in the form of a long strip hole structure extending left and right, a multi-stage flow channel connecting the feed film port and the discharge die port is arranged inside the die seat, the multi-stage flow channel is a flow channel structure of more than two stages arranged in sequence from top to bottom, the multi-stage flow channel comprises a first-stage flow channel connected with the feed film port, and a last-stage flow channel connected with the discharge die port; wherein the first-stage flow channel is divided into two to become a second-stage flow channel in opposite directions; the last-stage flow channel is connected with the discharge die port through a gradient narrow flat flow channel extending left and right, and the last-stage flow channel is a cavity flow channel with a small upper part and a large lower part.

[0007] The beneficial effect of the present invention is that when in use, the melt enters from the feed membrane mouth, and the melt flows downward along the multi-stage flow channel, wherein the first stage flow channel in the multi-stage flow channel is divided into two to become the second stage flow channel in the opposite direction, which can more easily change the extrusion pressure of the melt in the die head to meet the equal pressure drop, and the melt coming out of the last stage flow channel of the cavity flow channel passes through the gradient narrow flat flow channel and then is extruded from the discharge die mouth. The cavity flow channel is small, and the gradient narrow flat flow channel plays a balancing role, thereby improving the uniformity of the melt and meeting the isochronism requirement at the same time, thereby effectively improving the uniformity of the film extruded and formed from the discharge die mouth and reducing the thickness deviation.

[0008] As a further improvement of the above technical solution, the cross-section of the flow channel on the upper side of the last-stage flow channel is a circular structure, which can make the flow of the melt more uniform and reduce the flow resistance.

[0009] As a further improvement of the above technical solution, the last stage flow channel is a trumpet structure with a small top and a large bottom on the main projection plane, and the cross section of the last stage flow channel is a flat structure with a large top and a small bottom. In this way, the last stage flow channel can play a mixing role.

[0010] As a further improvement of the above technical solution, the die head seat includes a front die body and a rear die body, the front die body and the rear die body are assembled and connected by bolts, and the feed membrane port, the discharge die port, the multi-stage flow channel and the gradient narrow flat flow channel are formed between the front die body and the rear die body.

[0011] The die head seat in this embodiment is connected by a front die body and a rear die body, and grooves are arranged on the surfaces of the front die body and the rear die body that fit each other, and the grooves on both sides are symmetrically arranged to form a feed film opening, a discharge die opening, a multi-stage flow channel and a gradient narrow flat flow channel.

[0012] As a further improvement of the above technical solution, the front mold body and the rear mold body are both provided with connecting holes that penetrate from front to back, and the number of the connecting holes is multiple, and the two corresponding connecting holes in the front and back are connected by the bolts. The multiple connecting holes can improve the firmness and sealing of the connection between the front mold body and the rear mold body, and prevent the melt from leaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0014] Figure 1 This is a schematic diagram of the internal structure of a novel structure casting die head provided by the present invention, and a front view of an embodiment thereof;

[0015] Figure 2 The present invention provides a novel structure casting die head, and a schematic side view of the interior of one embodiment thereof. DETAILED DESCRIPTION

[0016] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0017] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] In the description of the present invention, if there are words such as "several", it means one or more, "more" means more than two, greater than, less than, exceed, etc. are understood as not including the number, and above, below, within, etc. are understood as including the number.

[0019] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0020] Reference Figure 1-2 The novel structure casting die head of the present invention is made into the following embodiments:

[0021] The novel structure casting die of the present embodiment includes a die seat, wherein the die seat includes a front die body 700 and a rear die body 800, the front die body 700 and the rear die body 800 are assembled and connected by bolts, and grooves are arranged on the mutually abutting surfaces of the front die body 700 and the rear die body 800, and the grooves on both sides are symmetrically arranged to form a feed film opening 100, a discharge die opening 200, a multi-stage flow channel and a gradient narrow flat flow channel 500, the feed film opening 100 is arranged at the top of the die seat, the discharge die opening 200 is arranged at the bottom of the die seat, and the discharge die opening 200 is arranged in a long strip hole structure extending left and right, the feed film opening 100 and the discharge die opening 200 are connected through the multi-stage flow channel and the gradient narrow flat flow channel 500, and the multi-stage flow channel includes a first-stage flow channel 300 connected to the feed film opening 100, a last-stage flow channel 400 connected to the discharge die opening 200, and a third-stage flow channel 500 connected to the discharge die opening 200. 00. When in use, the melt enters from the feed film port 100, and flows downward along the multi-stage flow channel, wherein the first stage flow channel is divided into two to become the second stage flow channel in the opposite direction, so that it is easier to change the extrusion pressure of the melt in the die head to meet the equal pressure drop, and the last stage flow channel 400 is connected to the discharge die 200 through a gradient narrow flat flow channel 500 extending left and right, and the last stage flow channel 400 is a cavity flow channel with a small upper part and a large lower part. The melt coming out of the last stage flow channel 400 of the cavity flow channel passes through the gradient narrow flat flow channel 500 and is then extruded from the discharge die 200. The cavity flow channel is relatively small, and the gradient narrow flat flow channel 500 plays a balancing role, thereby improving the uniformity of the melt and meeting the isochronism requirements at the same time. Therefore, it can effectively improve the uniformity of the film extruded and formed by the discharge die 200 and reduce the thickness deviation.

[0022] Furthermore, the cross-sections of the flow channels on the upper side of the last-stage flow channel 400 are all circular structures, which can make the flow of the melt more uniform and reduce the flow resistance.

[0023] The last-stage runner 400 is a trumpet structure with a small top and a large bottom on the main projection plane, and the cross section of the last-stage runner 400 is a flat structure with a large top and a small bottom. In this way, the last-stage runner 400 can play a mixing role. The trumpet structure has a good mixing effect on the melt. During extrusion, a part of the melt in the last-stage runner 400 flows vertically from the cavity to the gradient narrow flat runner 500, and at the same time, a part of the melt flows along the runner wall to the gradient narrow flat runner 500. The melt flows from the outlet formed by the two inclined surfaces in the gradient narrow flat runner 500 to the discharge die 200, and then is extruded from the discharge die 200.

[0024] In this embodiment, the front mold body 700 and the rear mold body 800 are both provided with connecting holes 600 that penetrate from front to back. The number of the connecting holes 600 is multiple, and the two corresponding connecting holes 600 are connected by the bolts. The multiple connecting holes 600 can improve the firmness and sealing of the connection between the front mold body 700 and the rear mold body 800, and prevent the melt from leaking.

[0025] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A new type of structure casting die head, characterized by: It includes: A die head seat, wherein a feed film opening (100) is arranged at the top of the die head seat, and a discharge die opening (200) is arranged at the bottom of the die head seat, the discharge die opening (200) is in the form of a long hole structure extending left and right, and a multi-stage flow channel connecting the feed film opening (100) and the discharge die opening (200) is arranged inside the die head seat, the multi-stage flow channel is a flow channel structure of more than two stages arranged in sequence from top to bottom, and the multi-stage flow channel includes a first-stage flow channel (300) connected to the feed film opening (100) and a last-stage flow channel (400) connected to the discharge die opening (200); Among them, the first-stage flow channel is divided into two, becoming the second-stage flow channel with opposite directions; The last-stage flow channel (400) is connected to the discharge die opening (200) via a gradually changing narrow flat flow channel (500) extending left and right, and the last-stage flow channel (400) is a cavity flow channel that is small at the top and large at the bottom; The cross-sections of the flow channels on the upper side of the last-stage flow channel (400) are all circular structures; The last-stage flow channel (400) presents a trumpet structure that is small at the top and large at the bottom on the front projection plane, and the cross section of the last-stage flow channel (400) in the fluid direction in the side view direction presents a flat structure that is large at the top and small at the bottom.

2. A new type of structure casting die according to claim 1, characterized in that: The die head seat comprises a front die body (700) and a rear die body (800), wherein the front die body (700) and the rear die body (800) are assembled and connected by bolts, and the feed film port (100), the discharge die port (200), the multi-stage flow channel and the gradient narrow flat flow channel (500) are formed between the front die body (700) and the rear die body (800).

3. A new type of structure casting die according to claim 2, characterized in that: Both the front mold body (700) and the rear mold body (800) are provided with front-to-back penetrating connection holes (600), the number of the connection holes (600) is multiple, and two corresponding front-to-back connection holes (600) are connected by the bolts.

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