CN110920020A - Inner cavity narrow slit ventilation structure of plastic profile extrusion molding die and processing method - Google Patents

Abstract

The invention discloses an inner cavity narrow slit ventilation structure of a plastic profile extrusion molding die and a processing method, wherein an insert is arranged in a template, and the main body of the insert is in a tapered wedge shape; one inwardly from the small end face of the insert

Air holes; on a flat side of the insert and

air grooves are arranged at the corresponding parallel and level positions of the air holes; in that

The deepest part of the air hole is provided with a transverse partTo the direction of

Air hole, air groove and

the air holes are communicated. By adopting the technical scheme, the problem that the gas path cannot be machined or a complicated narrow-slit structure is machined can be solved only by installing the movable insert with the gas path, and the structure is simple and the machining cost is low; the insert can be disassembled, and the gas path structure is a side-surface slotted drainage structure, so that the gas path is very convenient to clean, and the subsequent maintenance of the mold is convenient; the processing efficiency is improved, and products meeting the quality standards of relevant values are ensured to be produced.

Description

Inner cavity narrow slit ventilation structure of plastic profile extrusion molding die and processing method

Technical Field

The invention belongs to the technical field of plastic profile extrusion molding dies, and relates to an inner cavity ventilation structure of a plastic profile extrusion molding die. More particularly, the invention relates to an inner cavity narrow gap ventilation structure of a plastic profile extrusion molding die. In addition, the invention also relates to a processing method of the ventilation structure.

Background

In the existing plastic profile forming process, for a section with a plurality of cavities and a smaller inner wall gap, the problems that the pressure difference between the inside and the outside of the profile is large due to the high temperature of an inner cavity when the plastic profile is started, gas in a cavity is not easy to discharge, ribs are easy to stick, the forming is difficult and the like are solved by increasing a gas circuit in the inner cavity of a mold and keeping the air flow inside and outside the cavity smooth.

The existing gas path processing mainly comprises the steps of directly processing gas holes in an inner cavity of a die and leading out the gas holes from an inlet and an outlet of the die, and is suitable for sectional materials with most structures. However, for a narrow slit structure with a small inner wall gap, if a part of the narrow slit structure is not used as a structural section, the processing technology has the following defects:

1. as shown in FIG. 1, since the width of the narrow slit is small and is only 1.7mm at maximum, the diameter of the air hole

Therefore, the electric spark torch cannot be used for machining, and only the electric spark torch can be used for machining. Because the diameter of the electrode tube is very small, and the path is long, the processing efficiency is low, and meanwhile, because the discharge jitter of the electrode tube is easy to generate deflection, the precision is difficult to ensure, and the requirement on the skill of processing personnel is high.

2. When the mold is maintained, if the air holes are blocked and the like, the diameter is only 1mm, so that the mold is very difficult to clean, and the subsequent maintenance of the mold is not facilitated.

Disclosure of Invention

The invention provides an inner cavity narrow-slit ventilation structure of a plastic profile extrusion molding die, and aims to solve the problem that a gas path in a narrow-slit structure cannot be processed or is difficult to process.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention relates to an inner cavity narrow slit ventilation structure of a plastic profile extrusion molding die, which comprises a template; an insert is arranged in the template, and the main body of the insert is in a wedge shape; the two ends of the insert are respectively provided with a section of process lap and the wedge to form a whole; one inwardly from the small end face of the insert

Air holes with the depth of subtracting 0.9mm from the length of the wedge; on a flat side of the insert and

air grooves are arranged at the corresponding parallel and level positions of the air holes, the depth of each air groove is 0.4mm, and the width of each air groove is 0.8 mm; in that

The deepest part of the air hole is provided with a transverse part

Air hole, air groove and

the air holes are communicated.

And a block with the same shape and size as the insert is cut off from the template, so that the template forms a vacancy, and the insert and the vacancy form transition fit.

The length of the insert is 22 mm.

The appearance of the process lap is respectively the same as the appearance of the two ends of the insert, and the thickness of the process lap is 1 mm.

Determining a coordinate system by taking the large end surface of the insert as a projection surface, taking the projection of one side surface as a Y coordinate, taking the side line of one inclined surface at the large end as an X coordinate, wherein

The central coordinate position of the orifice of the air hole is 7.21mm, and the Y is 2.6 mm; the coordinate position of the notch of the air groove is X-0.

And cutting off the process lap at two ends of the insert under the state that the insert is processed and installed in the template.

In order to achieve the same purpose as the technical scheme, the invention also provides a processing method of the inner cavity narrow slit ventilation structure of the plastic profile extrusion molding die, which comprises the following steps:

preparing a blank with the thickness of 24mm, and cutting an insert with a certain taper to be better embedded into the template;

using the left lower corner of the insert outlet as a reference point, firstly machining one insert by electric spark at the position where X is 7.21mm and Y is 2.6mm

Air holes with the depth of 21.1 mm;

then, an air groove with the width of 0.8mm and the depth of 0.4mm is processed at the position where X is 0mm and Y is 2.6mm, and the air groove extends backwards for 21.1 mm;

finally, one is processed at the position of X ═ 0, Y ═ 2.6 and Z ═ 20.5

Air hole combination

The insert is processed completely if the insert is communicated with the mold cavity;

using a flange slow wire for processing, cutting off a block at the corresponding position of the template by linear cutting, wherein the shape and the size of the block are the same as those of the insert;

embedding the processed insert into a template, performing transition fit on the insert and the template, and milling off the process lap of 1mm reserved at each end of the insert after the degree of tightness is adjusted properly;

and finally, grinding the surface of the plate to be flat, and finishing the whole process flow of processing and assembling the ventilation structure.

By adopting the technical scheme, the problem that the gas path cannot be machined or a complicated narrow-slit structure is machined can be solved only by installing the movable insert with the gas path, and the gas path machining device is simple in structure and low in machining cost; the insert can be disassembled, and the gas path structure is a side-surface slotted drainage structure, so that the gas path is very convenient to clean, and the subsequent maintenance of the mold is convenient; the processing efficiency is improved, and products meeting the quality standards of relevant values are ensured to be produced.

Drawings

The contents of the drawings, and the references therein, are briefly described as follows:

FIG. 1 is a schematic view of a narrow gap vent structure of an inner cavity of a forming die in the prior art;

FIG. 2 is a schematic view of an insert structure of the present invention;

FIG. 3 is a left side view of the structure shown in FIG. 2;

FIG. 4 is a left side view of the structure shown in FIG. 3;

fig. 5 is a schematic view of an insert mounted to a die plate.

Labeled as:

1. template, 2, insert, 3, process lug, 4,

Air hole 5, air groove 6,

And (4) air holes.

Detailed Description

The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.

The invention aims to provide an inner cavity narrow-slit ventilation structure of a plastic profile extrusion molding die, which solves the problems that a gas circuit of a narrow-slit structure cannot be processed or is difficult to process, improves the processing efficiency and solves the problem that subsequent die air holes are difficult to clean.

The structure of the invention as shown in fig. 2 to 5 is an inner cavity narrow slit ventilation structure of a plastic profile extrusion molding die, and the molding die comprises a template 1.

In order to solve the problems in the prior art, overcome the defects of the prior art and achieve the purpose of solving the problem that an air passage in a narrow slit structure cannot be processed or is difficult to process, the invention adopts the technical scheme that:

as shown in fig. 2 to 5, in the inner cavity narrow gap ventilation structure of the plastic profile extrusion molding die of the present invention, an insert 2 is disposed in the die plate 1, and a main body of the insert 2 is in a tapered wedge shape; the two ends of the insert 2 are respectively provided with a section of process lap 3 and the wedge are integrated; one inwardly from the small end face of the insert 2

The depth of the air hole 4 is the length of the wedge minus 0.9 mm; on a flat side of the insert 2 and

air grooves 5 are arranged at the corresponding parallel and level positions of the air holes 4, the depth of each air groove is 0.4mm, and the width of each air groove is 0.8 mm; in that

The deepest part of the air hole 4 is provided with a transverse part

Air hole6, mixing the gas tank 5 with

The air holes 4 are communicated.

The part of the mold, which needs to be processed with the gas circuit, adopts the insert structure, the gas circuit is processed on the insert, and then the insert is embedded into the mold plate.

Compared with the prior art, the invention has the following advantages:

1. for the gas path which can not be processed or the complicated narrow slit structure can be processed, only a movable insert with the gas path is needed to be installed, and the gas path processing device has simple structure and lower processing cost;

2. the mold insert can be dismantled, and the gas circuit structure is side fluting drainage structure, and is very convenient when clearing up the gas circuit, the follow-up maintenance of the mould of being convenient for.

As shown in fig. 5, the template 1 is cut off to form a space with the same shape and size as the insert 2, so that the template 1 forms a gap, and the insert 2 forms a transition fit with the gap.

The insert type is a movable insert, and the movable insert is in transition fit with the template and can be detached during maintenance of the mold.

The shape and the size of the concrete structure are as follows:

as shown in fig. 2: the length of the insert 2 is 22 mm.

The appearance of the process lap 3 is respectively the same as the appearance of the two ends of the insert 2, and the thickness of the process lap is 1 mm.

The technical joint 3 has the function of clamping and positioning by using the technical joint 3 in the processing process, thereby being convenient for processing. And if not, the positioning processing of the inclined plane is difficult.

The specific arrangement of the air holes:

determining a coordinate system by taking the large end face of the insert 2 as a projection plane, taking the projection of one side face as a Y coordinate, taking the side line of one inclined plane at the large end as an X coordinate, wherein

The central coordinate position of the orifice of the air hole 4 is 7.21mm, and the Y is 2.6 mm; the coordinate position of the notch of the air groove 5X is 0.

The processing, manufacturing and mounting method comprises the following steps:

1. as shown in fig. 2, 3 and 4, a blank with a thickness of 24mm is prepared, and an insert 2 as shown in fig. 2, 3 and 4 is cut out, wherein the insert 2 has a certain taper to be better inserted into the template 1;

manufacturing a conical insert, and processing an air hole: using the left lower corner of the insert outlet as a reference point, firstly machining one insert by electric spark at the position where X is 7.21mm and Y is 2.6mm

Air holes 4 with the depth of 21.1 mm;

then, an air groove 5 with the width of 0.8mm and the depth of 0.4mm is processed at the position where X is 0mm and Y is 2.6mm, and the air groove extends backwards for 21.1 mm;

finally, one is processed at the position of X ═ 0, Y ═ 2.6 and Z ═ 20.5

Air hole 6 is connected with

And (4) penetrating, and finishing the machining of the insert 2.

2. As shown in fig. 5, a piece is cut off by linear cutting at the corresponding position of the mold, and the taper of the piece is the same as that of the insert 2; and a flange wire can be machined to ensure the machining precision.

And cutting off the process lap 3 at two ends of the insert 2 under the state that the insert 2 is processed and installed in the template 1.

The processed insert 2 shown in fig. 2 to 4 is embedded into the template 1 shown in fig. 5, the insert 2 and the template 1 are in transition fit, and after the tightness degree is adjusted to be proper, the allowance (namely the process lap 3) of 1mm reserved on the inlet and outlet surfaces of the insert 2 is milled off.

Because the insert 2 is a movable insert and can be disassembled, the inlet and outlet matching surfaces can not be welded, and the requirement on the matching precision is higher.

And finally, grinding the surface of the plate to be flat, and finishing the whole processing and assembling process flow.

The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.

Claims (7)

1. Plastics profile shapes extrusion moulding mould's inner chamber slot ventilation structure, forming die include template (1), its characterized in that: an insert (2) is arranged in the template (1), and the main body of the insert (2) is in a wedge shape; the two ends of the insert (2) are respectively provided with a section of process lap (3) and are integrated with the wedge; one is arranged inwards from the small end surface of the insert (2)

The depth of the air hole (4) is the length of the wedge minus 0.9 mm; on a flat side of the insert (2) and

air grooves (5) are arranged at the corresponding parallel and level positions of the air holes (4), the depth of each air groove is 0.4mm, and the width of each air groove is 0.8 mm; in that

The deepest part of the air hole (4) is provided with a transverse part

An air hole (6) for connecting the air groove (5) with

The air holes (4) are communicated.

2. An inner cavity narrow slit vent structure of a plastic profile extrusion molding die according to claim 1, wherein: and a block of the template (1) with the same shape and size as the insert (2) is cut off, so that the template (1) forms a vacancy, and the insert (2) and the vacancy form transition fit.

3. An inner cavity narrow slit vent structure of a plastic profile extrusion molding die according to claim 1, wherein: the length of the insert (2) is 22 mm.

4. An inner cavity narrow slit vent structure of a plastic profile extrusion molding die according to claim 1, wherein: the appearance of the process lap (3) is respectively the same as the appearance of the two ends of the insert (2), and the thickness of the process lap is 1 mm.

5. An inner cavity narrow slit vent structure of a plastic profile extrusion molding die according to claim 1, wherein: determining a coordinate system by taking the large end surface of the insert (2) as a projection surface, taking the projection of one side surface as a Y coordinate, and taking the side line of one inclined surface at the large end as an X coordinate, wherein the side line is a straight line, and the straight line is a straight line, and the

The central coordinate position of the orifice of the air hole (4) is 7.21mm, and 2.6 mm; the coordinate position of the notch of the air groove (5) is X-0.

6. An inner cavity narrow slit vent structure of a plastic profile extrusion molding die according to claim 1, wherein: and cutting off the process lap (3) at two ends of the insert (2) under the state that the insert (2) is processed and installed in the template (1).

7. A method for processing an inner cavity narrow slit vent structure of a plastic profile extrusion molding die according to any one of claims 1 to 6, wherein:

preparing a blank with the thickness of 24mm, and cutting an insert (2), wherein the insert (2) has a certain taper to be better embedded into the template (1);

the left lower corner of the outlet of the insert (2) is taken as a reference point, and the position where X is 7.21mm and Y is 2.6mm is firstly usedIs manufactured by electric spark

Air holes 4 with the depth of 21.1 mm;

then, a gas groove (5) with the width of 0.8mm and the depth of 0.4mm is processed at the position where X is 0mm and Y is 2.6mm, and the gas groove extends backwards for 21.1 mm;

finally, one is processed at the position of X ═ 0, Y ═ 2.6 and Z ═ 20.5

A gas hole (6) is connected with

The insert (2) is processed and finished after the insert is communicated;

using a flange wire to process, cutting off a block at the corresponding position of the template (1) by linear cutting, wherein the shape and the size of the block are the same as those of the insert (2);

embedding the processed insert (2) into the template (1), performing transition fit on the insert (2) and the template (1), adjusting the degree of tightness appropriately, and milling off the process lap (3) with the diameter of 1mm reserved at each of two ends of the insert (2);

and finally, grinding the surface of the plate to be flat, and finishing the whole process flow of processing and assembling the ventilation structure.

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