Small-caliber thick-wall heat-shrinkable tube expanding die and expanding system thereof
阅读说明:本技术 一种小口径厚壁热缩管扩张模具及其扩张系统 (Small-caliber thick-wall heat-shrinkable tube expanding die and expanding system thereof ) 是由 王思聪 卢燕芸 张定雄 熊鑫 倪丹 邢福发 王佰茂 丁一 郭智利 端木宇翔 孙志 于 2020-06-03 设计创作,主要内容包括:本发明公开了一种小口径厚壁热缩管正压扩张模具及其扩张系统,扩张模具包括依次固定连通的模具对接法兰、排气管芯、扩张管芯和定径管芯;排气管芯外部套设有排气管芯外套,排气管芯外套开设有用于排气的排气通孔,扩张管芯外部套设有扩张管芯外套,所述扩张管芯外套上开设有充气孔;扩张管芯外套与所述扩张管芯之间围成有保压腔,所述排气管芯被所述排气管芯外套包围的位置开设有若干排气小孔;扩张管芯被所述扩张管芯外套包围的位置开设有若干保压小孔。本发明使得热缩管与扩张管芯的管内壁减少接触摩擦甚至无接触摩擦,使得热缩管能够保持较低的偏壁率、稳定的纵向收缩率和光滑的表观。(The invention discloses a small-caliber thick-wall heat shrinkable tube positive pressure expansion die and an expansion system thereof, wherein the expansion die comprises a die butt flange, an exhaust tube core, an expansion tube core and a sizing tube core which are fixedly communicated in sequence; an exhaust tube core outer sleeve is sleeved outside the exhaust tube core, an exhaust through hole for exhausting is formed in the exhaust tube core outer sleeve, an expansion tube core outer sleeve is sleeved outside the expansion tube core, and an inflation hole is formed in the expansion tube core outer sleeve; a pressure maintaining cavity is defined between the outer sleeve of the expansion pipe core and the expansion pipe core, and a plurality of small exhaust holes are formed in the position of the exhaust pipe core, which is surrounded by the outer sleeve of the exhaust pipe core; and a plurality of pressure maintaining small holes are formed at the positions of the expanding tube core, which are surrounded by the outer sleeve of the expanding tube core. The invention can reduce contact friction and even avoid contact friction between the heat shrinkable tube and the inner wall of the tube of the expansion tube core, so that the heat shrinkable tube can keep lower wall offset rate, stable longitudinal shrinkage rate and smooth appearance.)
1. A small-caliber thick-wall heat shrinkable tube expansion die is characterized by comprising a die butt flange, an exhaust tube core, an expansion tube core and a sizing tube core which are fixedly communicated in sequence; an exhaust tube core outer sleeve is sleeved outside the exhaust tube core, an exhaust through hole for exhausting is formed in the exhaust tube core outer sleeve, an expansion tube core outer sleeve is sleeved outside the expansion tube core, and an inflation hole is formed in the expansion tube core outer sleeve; a pressure maintaining cavity is defined between the outer sleeve of the expansion pipe core and the expansion pipe core, and a plurality of small exhaust holes are formed in the position of the exhaust pipe core, which is surrounded by the outer sleeve of the exhaust pipe core; and a plurality of pressure maintaining small holes are formed in the positions of the expansion pipe cores, which are surrounded by the expansion pipe core outer sleeves.
2. The expanding die for the small-caliber thick-wall heat shrinkable tube as claimed in claim 1, wherein a sealing ring is arranged at a position where the exhaust tube core outer sleeve is connected with the exhaust tube core.
3. The expanding die for the small-caliber thick-wall heat shrinkable tube as claimed in claim 1, wherein a sealing ring is arranged at a position where the expanding tube core outer sleeve is connected with the expanding tube core.
4. The expanding die for the small-caliber thick-wall heat shrinkable tube as claimed in claim 1, wherein the inner diameter of the expanding tube core is larger than that of the sizing tube core, the inner diameter of the sizing tube core is larger than that of the exhaust tube core, and the inner diameter of the abutting flange of the die is 1-4 mm larger than the outer diameter of the unexpanded heat shrinkable tube.
5. An expansion system of a small-caliber thick-wall heat shrinkable tube, which is characterized by comprising the expansion die, a heating cylinder at the inlet end of the expansion die, a cooling water tank at the outlet end of the expansion die, and a tube conveying wheel and a traction wheel which are respectively used for conveying and traction the heat shrinkable tube, wherein the heating cylinder is arranged at the inlet end of the expansion die; the tail end of the heat shrink tube is connected with a third inflation device, the heating cylinder is provided with a first inflation device, and the expansion die is connected with a second inflation device through the inflation hole.
6. The small-caliber thick-wall heat shrinkable tube expanding system as claimed in claim 5, wherein the expanding die tip is inclined downward and has an angle of less than 180 ° with the axial direction of the heating cylinder.
7. The system for expanding the small-caliber thick-wall heat shrinkable tube as claimed in claim 5, wherein the expanding die is fixedly connected with the heating cylinder through the die butting flange, a sizing tube core of the expanding die is in direct contact with cooling water of the cooling water tank, and the liquid level of the cooling water covers the inner upper wall of the sizing tube core.
8. The small-caliber thick-wall heat shrinkable tube expanding system of claim 5, wherein the heating cylinder is a fully sealed heating oil tank.
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of machine manufacturing, in particular to an expansion die and an expansion system for a small-caliber thick-wall heat shrinkable tube.
[ background of the invention ]
At present, a heat shrinkable tube expansion system comprises a conveying device, a heating furnace, an expansion device, a cooling device and a traction device, wherein a small-caliber heat shrinkable tube expansion device generally adopts a negative pressure mode, namely, a vacuum is pumped in an expansion mould to cause negative pressure, so that a heat shrinkable tube is expanded; in the negative pressure expansion, the expansion mold is usually set to slightly leak air to properly reduce the vacuum degree, so as to prevent the problem of large longitudinal shrinkage rate of the heat shrinkable tube caused by over-tight adhesion between the heat shrinkable tube and the inner wall of the expansion mold. However, for a thick-wall heat-shrinkable tube with a small diameter and a high magnification, the expansion finished product is seriously deviated from the wall due to the uneven local vacuum degree generated by air leakage in negative pressure expansion, the longitudinal shrinkage rate is unstable, and the expansion speed can only be controlled at an extremely low level.
[ summary of the invention ]
In order to solve one or more of the problems, the invention provides a positive pressure expansion die suitable for a small-caliber thick-wall heat-shrinkable tube and an expansion system thereof, wherein the expansion speed of the small-caliber thick-wall heat-shrinkable tube can be increased by 1-4 times according to different expansion multiplying powers in a positive pressure expansion mode of introducing compressed air into the heat-shrinkable tube, the longitudinal shrinkage rate and the deflection rate can be stably controlled within a qualified range, and the expansion rate is obviously improved compared with negative pressure expansion.
In order to achieve the purpose, the small-caliber thick-wall heat shrinkable tube expansion die provided by the invention comprises a die butt flange, an exhaust tube core, an expansion tube core and a sizing tube core which are fixedly communicated in sequence; an exhaust tube core outer sleeve is sleeved outside the exhaust tube core, an exhaust through hole for exhausting is formed in the exhaust tube core outer sleeve, an expansion tube core outer sleeve is sleeved outside the expansion tube core, and an inflation hole is formed in the expansion tube core outer sleeve; a pressure maintaining cavity is defined between the outer sleeve of the expansion pipe core and the expansion pipe core, and a plurality of small exhaust holes are formed in the position of the exhaust pipe core, which is surrounded by the outer sleeve of the exhaust pipe core; and a plurality of pressure maintaining small holes are formed in the positions of the expansion pipe cores, which are surrounded by the expansion pipe core outer sleeves.
In a preferred embodiment, the exhaust pipe core outer sleeve is provided with a sealing ring at the position connected with the exhaust pipe core, and the expansion pipe core outer sleeve is provided with a sealing ring at the position connected with the expansion pipe core.
In a preferred embodiment, the inner diameter of the expanding tube core is larger than that of the sizing tube core, the inner diameter of the sizing tube core is larger than or equal to that of the exhaust tube core, and the inner hole diameter of the mold butting flange is 1-4 mm larger than the outer diameter of the unexpanded heat shrinkable tube.
In order to achieve the above purpose, the invention further provides a small-caliber thick-wall heat shrinkable tube expanding system, which comprises the expanding mold, a heating cylinder at the inlet end of the expanding mold, a cooling water tank at the outlet end of the expanding mold, and a tube conveying wheel and a traction wheel which are respectively used for conveying and traction the heat shrinkable tube; the tail end of the heat shrink tube is connected with a third inflation device, the heating cylinder is provided with a first inflation device, and the expansion die is connected with a second inflation device through an inflation hole.
In a preferred embodiment, the expansion die tip is inclined downwardly and the heating cartridge is oriented axially at an angle of less than 180 °. The tail end of the expansion mould is inclined downwards, so that the heat shrinkable tube can be cooled and shaped after coming out of the expansion mould and then inclined downwards to enter a cooling water tank at a certain angle, and the arrangement of the inclined angle prevents cooling water from flowing backwards into the expansion mould.
In a preferred embodiment, the expansion die is fixedly connected with the heating cylinder through the die butt flange, a sizing tube core of the expansion die is directly contacted with cooling water of the cooling water tank, and the liquid level of the cooling water covers the inner upper wall of the sizing tube core.
In a preferred embodiment, the heating cartridge is a fully sealed heating oil tank.
According to the small-caliber thick-wall heat shrinkable tube expanding die and the expanding system thereof, the third inflating device inflates compressed air into the heat shrinkable tube to make the air pressure in the heat shrinkable tube uniform, the gas is inflated into the pressure maintaining cavity between the outer sleeve of the expanding tube core and the expanding tube core through the inflating hole, the gas in the pressure maintaining cavity is communicated with the gas in the tube cavity in the expanding tube core through the pressure maintaining hole to form a flowable state, the gas in the cavity filled with the heat shrinkable tube and the gas in the tube cavity of the expanding tube core form pressure balance, and the pressure balance can reduce contact friction or even avoid contact friction between the heat shrinkable tube and the tube inner wall of the expanding tube core while the heat shrinkable tube is expanded, so that the heat shrinkable tube can keep a low partial wall rate, a stable longitudinal shrinkage rate and a smooth appearance.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a positive pressure expanding mold for a small-caliber thick-wall heat shrinkable tube according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a positive pressure expanding system for small-caliber thick-wall heat shrinkable tubes according to a preferred embodiment of the present invention;
the reference numbers illustrate: the device comprises an expansion die 10, a
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantageous effects of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, the small-diameter thick-wall heat shrinkable tube positive pressure expanding system of the present invention includes an expanding
The end of the
Preferably, the end of the
Further, the
Further, the
Further, the small-caliber thick-wall heat shrinkable tube positive pressure expansion die 10 comprises a
Further, an exhaust tube core
Preferably, a plurality of exhaust
Furthermore, a
Specifically, the inner diameter of the
Specifically, each inflation device sets a pressure value relationship as follows: the
When the small-caliber thick-wall heat-shrinkable tube expanding system works, the heat-
The
The expanding die and the expanding system for the small-caliber thick-wall heat-shrinkable tube can realize positive pressure expansion of the small-caliber thick-wall heat-shrinkable tube, and ensure stable longitudinal shrinkage and wall deflection rate of a product while not reducing production speed.
During expansion, the
According to the invention, by adopting a positive pressure expansion mode of introducing compressed air into the heat shrinkable tube, the expansion speed of the small-caliber thick-wall heat shrinkable tube can be increased by 1-4 times according to different expansion multiplying powers, and the longitudinal shrinkage rate and the wall deflection rate can be stably controlled within a qualified range.
The invention is not limited solely to that described in the specification and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.
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