CN113829604A - Design method of extruded tube type special-shaped flat sheath cable die sleeve - Google Patents

Abstract

The invention discloses a design method of an extruded tube type special-shaped flat sheath cable die sleeve, which comprises the following steps: (1) calculating the sizes of the mold core and the mold sleeve; (2) calculating the lifting height H of the upper side and the lower side of the die sleeve, wherein the height H is (0.1-0.3) × k, and k is the distance between the conventional tube extruding type die core and the die sleeve; (3) finding out an upper end point upwards at the middle point of the die sleeve plane, wherein the distance between the upper end point and the die sleeve plane is H, drawing an upper circle by adopting three points which are respectively the upper end point and two upper tangent points of the die sleeve, and removing an arc section of the upper circle below the upper tangent points to obtain an upper arc section; (4) obtaining a lower arc section in the same step (3); (5) the upper arc section, the arc section between the left upper tangent point and the left lower tangent point, the lower arc section, and the arc section between the right upper tangent point and the right lower tangent point form the inner contour of the special-shaped flat sheath cable die sleeve; the flat sheathed cable produced by the die sleeve is suitable for hot stamping by adopting a concave-convex character wheel.

Description

Design method of extruded tube type special-shaped flat sheath cable die sleeve

Technical Field

The invention relates to a design method of an extruded tube type special-shaped flat sheath cable die sleeve, which is used for manufacturing the extruded tube type special-shaped flat sheath cable die sleeve, so that a flat sheath cable produced by the die sleeve is suitable for hot stamping by adopting a concave-convex character wheel.

Background

With the rapid development of society, the demands of the market for cables become more diversified. The flat cable has low manufacturing cost, light weight, strong toughness and small occupied space, and is easy to use in large-scale equipment and small-scale equipment. The flat cable is mainly formed by combining a plurality of wire cores together and placing the wire cores in parallel and wrapping a layer of cable sheath by a cable extruder, and is shown in figure 1.

The flat sheathed cable is divided into an extrusion type structure and an extrusion tube type structure according to different sheathing processes, as shown in fig. 1 and 2. Wherein extrusion formula shape outward appearance is formed well, but with the volume of gluing big, production efficiency is low to the tension system requirement to extrusion equipment is strict, and because the sheath closely laminates with insulating sinle silk, causes sinle silk and sheath skin adhesion easily, difficult peeling off, causes the influence to customer's later stage use. Compared with an extrusion type, the extrusion pipe type extrusion device has the advantages of small extrusion pressure, less glue consumption, high production efficiency and low precision requirement on extrusion equipment, but the extrusion device is poor in forming, and due to the fact that a gap exists between the sheath and the insulated wire core, the phenomenon of apparent depression of the sheath is easily generated at the gap between the insulation and the sheath, and the defect is shown in fig. 3. Due to the existence of the depressions, dimensional defects, printing defects, and the like occur during the flat-type platen press, as shown in fig. 4. Therefore, the method of hot printing by the concave-convex character wheel can not be adopted, only the ink jet printer can be adopted to print the mark, and the ink printed mark is not resistant to abrasion and causes great trouble to the later use of customers.

Disclosure of Invention

The invention aims to solve the technical problem of providing a design method of an extruded tube type special-shaped flat sheath cable die sleeve, and the flat sheath cable produced by the die sleeve is suitable for hot stamping by adopting a concave-convex character wheel.

In order to solve the technical problem, the invention relates to a design method of an extruded tube type special-shaped flat sheath cable die sleeve, which comprises the following steps:

(1) calculating the sizes of a conventional tube-extruding mold core and a conventional tube-extruding mold sleeve (namely the shape before being changed) according to the size of the tube-extruding flat sheath cable;

(2) calculating the lifting height H of the upper side and the lower side of the conventional (before changing) extruded tube type die sleeve:

H＝(0.1～0.3)*k

wherein k is the distance between the conventional tube extruding type mold core and the mold sleeve;

(3) upwards finding out an upper endpoint at the midpoint of the plane of the conventional pipe extrusion die sleeve above the conventional pipe extrusion die sleeve, wherein the distance between the upper endpoint and the plane of the conventional pipe extrusion die sleeve is H, drawing a circle by three points, namely drawing the upper endpoint and two upper tangent points of the conventional pipe extrusion die sleeve (namely the tangent points between the upper circle and the conventional pipe extrusion die sleeve (section)), and removing an arc segment of the upper circle below the upper tangent point to obtain an upper arc segment;

(4) a lower end point is found out downwards at the middle point of the plane of the conventional pipe extrusion die sleeve under the conventional pipe extrusion die sleeve, the distance between the lower end point and the plane of the conventional pipe extrusion die sleeve is H, a lower circle is drawn by adopting three points which are respectively the lower end point and two lower tangent points of the conventional pipe extrusion die sleeve (namely the tangent points between the lower circle and the conventional pipe extrusion die sleeve (section)), and an arc section of the upper circle and the lower circle, which is the lower tangent point, is removed to obtain a lower arc section;

(5) the upper arc section, the arc section between the left upper tangent point and the left lower tangent point, the lower arc section, and the arc section between the right upper tangent point and the right lower tangent point form the inner contour of the special-shaped flat sheath cable die sleeve.

In the above method, the described shape is expressed by the cross section of the die case.

When the pinch roller (print wheel) is pressed, the excessive sheath material generated by the height H is extruded into the gap of the approximate inverted triangle. When H is more than 0.3 xk, the amount of the redundant sheath materials generated by the cable sheath produced by the mold sleeve mold core due to the height H is larger than the gap (the gap between the sheath and the insulating wire core), and even if the cable sheath is pressed by the pressing wheel, the redundant rubber materials can also protrude and can not be pressed out of the plane. When H is less than 0.1 xk, the amount of the redundant sheath material generated by the cable sheath produced by the die sleeve die core due to the height H is less than the gap, and the pressing wheel is pressed, so that the gap between the insulation layer and the sheath is easy to be sunken.

The flat sheathed cable produced by the die sleeve and the die core manufactured by the method has the advantages that the left side and the right side of the sheath are gradually formed after the die sleeve opening is opened, the forming of the upper side and the lower side of the sheath is consistent with that of the die sleeve after the die sleeve opening is opened, the upper side and the lower side of the sheath are both convex, and the shape of the extruded cable is not in accordance with the requirement. Forming an upper horizontal plane and a lower horizontal plane by extrusion molding of two plane character wheels (adjusting the distance between an upper printing wheel and a lower printing wheel if necessary) to be consistent with the required shape; and meanwhile, the printing words on the plane concave character wheel are clearly imprinted on the surface of the cable.

The invention has the technical effects that:

1. the sheath cable die sleeve obtained by the method is suitable for extruded tube type production, the thickness of the upper side and the lower side of the sheath is increased by the process, the poor size and poor printing are avoided when the printing wheel imprints, and further the gravure printing of the character wheel by the extruded tube type sheath can be realized.

2. The sheath cable die sleeve obtained by the method is suitable for gravure character wheel printing. Compared with code-spraying printing, the printing is improved in scratch resistance and wear resistance, and the later-stage use of the cable is greatly improved.

3. The sheath cable die sleeve obtained by the method is suitable for extrusion tube type production, reduces pressure, is convenient for stripping heads and is convenient for later use.

4. The sheath cable die sleeve obtained by the method is suitable for extruded tube type production, compared with an extruded sheath, the rubber output is reduced, the production efficiency is improved, the requirement on the quality of the tension quality of equipment is lowered, and the cost is lowered.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic view of an extruded jacketed cable.

Fig. 2 is a schematic view of a tube-extruded sheathed cable.

FIG. 3 is a schematic view of a collapse defect of a cable with a tube-extruded sheath.

Fig. 4 is a schematic view showing the occurrence of dimensional defects and printing defects in the flat platen press.

FIG. 5 is a schematic view of a die for extruding a pipe.

FIG. 6 is a schematic diagram of the design of the upper mold sleeve.

Fig. 7 is a schematic view of a designed form die set.

Fig. 8 is a schematic view of the print wheel production.

FIG. 9 is a schematic diagram of a sheath produced by a die set normally designed for the method of the present invention.

Fig. 10 is a schematic diagram of the jacket produced by the die set when H > 0.3 × k.

Fig. 11 is a schematic diagram of the jacket produced by the die set at H < 0.1 × k.

Detailed Description

The design method of the extruded tube type special-shaped flat sheath cable die sleeve comprises the following steps:

(1) the sizes of the conventional tube-extruding type mold core 1 and the conventional tube-extruding type mold sleeve 2 are calculated according to the size of the tube-extruding type flat sheath cable, and as shown in fig. 5, the sizes are expressed by the sections of the mold sleeve 2 and the mold core.

(2) And calculating the lifting height H of the upper side and the lower side of the conventional pipe extrusion type die sleeve 2, wherein the height H is (0.1-0.3) k, and k is the distance between the conventional pipe extrusion type die core and the die sleeve.

(3) Above the conventional pipe extrusion die sleeve 2, finding an upper endpoint 4 upwards at the middle point of the plane of the conventional pipe extrusion die sleeve 2, drawing a circle by using three points, wherein the distance between the upper endpoint 4 and the plane of the conventional pipe extrusion die sleeve 2 is H, the three points are respectively an upper endpoint 4 and two upper tangent points 5 and 6 at the left and the right of the conventional pipe extrusion die sleeve 2, and removing the arc section of the upper circle below the upper tangent points 5 and 6 to obtain an upper arc section, and the process is shown in figure 6.

(4) And (3) finding a lower end point 9 downwards at the middle point of the plane of the conventional pipe extrusion die sleeve 2 below the conventional pipe extrusion die sleeve 2 (as shown in fig. 7), drawing a lower circle by using three points, wherein the three points are respectively the lower end point and two lower tangent points 9 of the conventional pipe extrusion die sleeve 2, and removing the arc sections of the lower circle above the lower tangent point 9 to obtain a lower arc section, wherein the principle is the same as that in the step (3).

(5) The upper arc section, the arc section between the left upper tangent point and the left lower tangent point, the lower arc section, and the arc section between the right upper tangent point and the right lower tangent point form the inner contour of the special-shaped flat sheath cable die sleeve, as shown in fig. 7.

The flat sheath cable produced by the designed die sleeve and the die core has the advantages that the left side and the right side of the sheath are gradually formed after the die sleeve openings are formed, the forming of the upper side and the lower side after the die sleeve openings are formed is consistent with that of the die sleeve, the upper side and the lower side are both convex, and the shape of the extruded cable is inconsistent with the requirements. As shown in fig. 8, the upper and lower horizontal planes are formed by extrusion molding of two plane print wheels (adjusting the distance between the upper and lower print wheels if necessary) to conform to the required shape; and meanwhile, the printing words on the plane concave character wheel are clearly imprinted on the surface of the cable.

In the method, when H is within the range of (0.1-0.3) × k, the designed die sleeve and the sheath produced by the die core are produced in a pipe extruding manner as shown in figure 9, redundant materials are compacted in a gap through a pressing wheel, the pressure between the sheath and the insulation is small, and the stripping force is small. When H is more than 0.3 x k, the designed die sleeve and the sheath produced by the die core are as shown in figure 10, and even if the pinch roller presses redundant materials in the gap, the glue material is too much, and the pinch roller cannot press the upper plane and the lower plane of the flat wire. H is less than 0.1 × k, the designed die sleeve and the jacket produced by the die core are shown in figure 11, redundant materials can not fill the gap far away, and when the pressing wheel presses, the gap between the insulation layer and the jacket is sunken, so that smooth stamping can not be realized.

The above embodiments do not limit the present invention in any way, and all technical solutions obtained by means of equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims (1)

1. The design method of the extruded tube type special-shaped flat sheath cable die sleeve is characterized by comprising the following steps of:

(1) calculating the sizes of a conventional tube-extruding mold core and a conventional tube-extruding mold sleeve according to the size of the tube-extruding flat sheath cable;

(2) calculating the lifting height H of the upper side and the lower side of the conventional extruded tube type die sleeve:

H＝(0.1～0.3)*k

wherein k is the distance between the conventional tube extruding type mold core and the mold sleeve;

(3) upwards finding out an upper end point at the middle point of the plane of the conventional pipe extrusion die sleeve above the conventional pipe extrusion die sleeve, drawing an upper circle by using three points, wherein the distance between the upper end point and the plane of the conventional pipe extrusion die sleeve is H, the three points are respectively the upper end point and two upper tangent points of the conventional pipe extrusion die sleeve, and removing an arc section of the upper circle below the upper tangent points to obtain an upper arc section;

(4) a lower end point is found out downwards at the middle point of the plane of the conventional pipe extrusion type die sleeve under the conventional pipe extrusion type die sleeve, the distance between the lower end point and the plane of the conventional pipe extrusion type die sleeve is H, a lower circle is drawn by adopting three points which are respectively the lower end point and two lower tangent points of the conventional pipe extrusion type die sleeve, and an arc section of the upper circle and the lower circle is removed from the lower tangent points to obtain a lower arc section;

(5) the upper arc section, the arc section between the left upper tangent point and the left lower tangent point, the lower arc section, and the arc section between the right upper tangent point and the right lower tangent point form the inner contour of the special-shaped flat sheath cable die sleeve.

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