KR20230090783A - Assembling structure of separate shaft and mandrel - Google Patents

Abstract

The present invention relates to a coupling structure between a separable shaft and a mandrel, and more specifically, since the first and second shafts have a structure in which only the first and second bosses are coupled, light weight and assembly properties can be greatly improved, and protection rings can be applied to minimize damage in the boss and shaft coupling, and the ease and precision of assembly can be secured through the keyway and shoulder bolt fastening method on the protection ring and the 1st and 2nd shafts, and structurally sagging compared to the long axis It relates to a coupling structure between a separable shaft and a mandrel that has excellent physical properties, can reduce principal stress, and has the effect of improving workability and economic efficiency by simplifying a separate jig tool and assembly / disassembly device for assembly / disassembly of the long shaft. .

Description

Assembly structure of separate shaft and mandrel

The present invention relates to a coupling structure between a separable shaft and a mandrel, and more specifically, since the first and second shafts have a structure in which only the first and second bosses are coupled, light weight and assembly properties can be greatly improved, and protection rings can be applied to minimize damage in the boss and shaft coupling, and the ease and precision of assembly can be secured through the keyway and shoulder bolt fastening method on the protection ring and the 1st and 2nd shafts, and structurally sagging compared to the long axis It relates to a coupling structure between a separable shaft and a mandrel that has excellent physical properties, can reduce principal stress, and has the effect of improving workability and economic efficiency by simplifying a separate jig tool and assembly / disassembly device for assembly / disassembly of the long shaft. .

In general, the filament winding technology is a method of manufacturing a molded product having an accommodation space formed therein by heating a fiber material having heat-hardening performance along the outer circumferential surface of a mold and then heating it.

However, when manufacturing a large molded article, when heating and hardening through hot air applied from the outside, insulation is required in a very wide space, so the efficiency is extremely low, resulting in a greatly reduced process efficiency.

In addition, when manufacturing a pressure vessel (tank) in which the diameter at both ends gradually decreases, manufacturing is difficult because it is not easy to dismantle the mold after curing due to the structure of the molded product when manufacturing through filament winding technology. there was.

Therefore, when manufacturing a pressure vessel (tank) with a gradually reduced diameter at both ends by filament winding technique, a method that can easily dismantle the mold and maximize preheating (heating) efficiency is proposed. It is necessary.

In this regard, looking at the prior art, 'a filament winding molding apparatus and a filament winding molding method using the apparatus' are disclosed in Korean Patent Registration No. 10-0629959, but this problem does not solve the difficulties raised above. there was.

As a prior art for solving this problem, as shown in FIG. 6, a body portion having both ends provided in a hemispherical shape in the form of a cylinder in which a rotational axis parallel to the ground is formed disclosed in Korean Patent Registration No. 10-2226423; A first shaft portion having one end portion insertably provided in an inward direction from one side of the end portion of the body portion; A second shaft part, one end of which is insertably provided in an inward direction from the other end of the body part, and the other end is provided to be coupled with one end of the first shaft, wherein the body part, the first The shaft part and the second shaft part are formed with a circulation path communicating with each other to facilitate circulation of the hot air introduced into the inside, and the body part is provided in a cylindrical shape in which a rotation axis parallel to the ground is formed. A first section portion; A second section portion having a first insertion hole provided in a hemispherical shape at one end of the first section portion and into which the first shaft portion is inserted; A second insertion hole provided in a hemispherical shape at the other end of the first section and into which the second shaft can be inserted; and a third section in which a second insertion hole is formed, wherein the first to third sections are coupled and disengaged. Disclosed is a mold having high preheating efficiency, characterized in that it is easily prepared.

However, in the case of the registered patent, since the hot air supplied through the shaft is not directly supplied to the outer surface of the body portion in contact with the molded product, but is transmitted via the hot air supply unit, there is a problem in that the thermal efficiency is lowered, and the shaft is significantly attached to the mold or mandrel. Since it is inserted a lot and has a structure in which hot air is transmitted from the center of the mandrel to the outside, it is substantially made of a long axis structure as if one shaft was inserted, and it has an internal structure to deliver hot air to the inside to secure lightness. It is difficult, and the assembly structure also has complex problems.

Republic of Korea Patent No. 10-2226423 Republic of Korea Patent No. 10-0629959

The present invention has been made to solve the problems of the prior art, and an object of the present invention is to greatly improve light weight and assembly property because the first and second separate shafts have a structure in which only the first and second bosses are coupled. By applying a protection ring, damage can be minimized in the combination of the boss and the shaft, and the ease and precision of assembly can be secured through the keyway and shoulder bolt fastening method on the protection ring and the 1st and 2nd shafts. Compared to the long axis, it has excellent properties against deflection, can reduce principal stress, and in terms of coupling, separate jigs and assembly / disassembly devices for assembling / disassembling the long axis metal shaft can be simplified. is to provide

The problem to be solved by the present invention is not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to achieve the above object, a coupling structure between a separable shaft and a mandrel according to the present invention is coupled to a cylinder portion, a pair of first and second dome portions disposed on the left and right of the cylinder portion, and the first and second dome portions. a detachable mandrel comprising a pair of first and second boss parts, the cylinder part and the first and second dome parts each having a structure in which a plurality of segments are assembled; a detachable first shaft detachably coupled to the first boss; and a detachable second shaft detachably coupled to the second boss, wherein the first and second detachable shafts are separated from each other without being connected, so that assemblability is improved and lightweight design is possible. to be

In addition, in the coupling structure between the separable shaft and the mandrel according to the present invention, a protective ring is interposed between the first boss portion and the separable first shaft and between the second boss portion and the separable second shaft, respectively.

In addition, in the coupling structure between the separable shaft and the mandrel according to the present invention, a flange portion coupled to the first dome portion and the second dome portion is formed at one end of the separable first shaft and the second shaft, respectively,

The protection ring is composed of a cylindrical portion inserted into the first boss portion or the second boss portion, and a disk portion extending along the circumferential direction of the cylindrical portion and abutting and coupled to the flange portion. In a state where the first boss part or the second boss part is inserted, the separable first shaft or the separable second shaft is inserted into the cylindrical part of the protection ring, and then the first boss part or the second boss part is connected to each other by using a fastening member. , It is characterized in that the protection ring and the flange portion are integrally coupled.

In addition, in the coupling structure between the separable shaft and the mandrel according to the present invention, the cylinder portion and the plurality of segments constituting the first and second dome portions have a structure in which an outer casing and an inner casing are combined, and the neighboring outer casings It is characterized in that the partition formed at each end is coupled through a fastening member in a state of contact, and the inner casing is coupled through the partition and the fastening member.

In addition, in the coupling structure between the separable shaft and the mandrel according to the present invention, an outer passage is formed between the outer casing and the inner casing, and the outer passage is partitioned by the partitions through ventilation holes formed in each partition. It is characterized by communication.

In addition, in the coupling structure between the separable shaft and the mandrel according to the present invention, the coupling portion in which the first and second bosses, the protection ring, and the flanges of the first and second shafts are integrally coupled increases resistance to bending and increases assembly It is coupled with a shoulder bolt to secure straightness, and the protection ring and the first and second shafts are coupled in such a way that a key is inserted into a key groove formed in each, thereby increasing the ease and precision of assembly. to be characterized

According to the present invention, since the separable shaft and mandrel coupling structure has a structure in which the first and second shafts of the separable type are coupled only to the first and second bosses, lightness and assembly properties can be greatly improved, and by applying a protection ring, the boss and the It is possible to minimize damage in shaft coupling, and it is possible to secure ease and precision of assembly through the keyway and shoulder bolt fastening method on the first and second shafts of the separation type and the protective ring, and structurally, the physical properties of deflection compared to the long axis This is excellent, the main stress can be reduced, and in terms of coupling, a separate jig tool and assembly/disassembly device for assembling/disassembling the long shaft metal shaft are simplified, resulting in improved workability and economic efficiency.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a plan view showing the structure of a mandrel according to the present invention.
FIG. 2 is an exploded perspective view showing how the boss portion of the mandrel, the protection ring, and the first shaft are coupled in FIG. 1;
3 is an enlarged cross-sectional view showing a combination of the boss portion of the mandrel, the protection ring, and the first shaft according to the present invention.
4 is an enlarged cross-sectional view showing a combination of the boss portion of the mandrel, the protection ring, and the second shaft according to the present invention.
5 is a perspective view showing the coupling relationship between the outer casing and the inner casing of the mandrel of the present invention.
6 is a view showing conventional Patent Registration No. 10-0629959.

Hereinafter, preferred embodiments of the present invention will be described in detail.

In describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention of a user or operator or a precedent. Therefore, the definition should be made based on the contents throughout this specification.

Among the terms used in the present invention, composite materials include organic/inorganic fibers such as glass fibers, carbon fibers, and aramid fibers, and prepregs manufactured by impregnating fibers with resins.

Among the terms used in the present invention, 'rubber' refers to heat-resistant rubber such as SBR, NBR, EPDM, etc. as well as natural rubber, and is a rubber in which carbon fiber, aramid fiber, or silica fiber is added as a filler or vulcanized to improve heat resistance and insulation performance. includes Rubber refers to rubber in an unvulcanized state, and includes rubber in which only a part of the surface is vulcanized due to the preform operation.

1 is a plan view showing the structure of a mandrel according to the present invention, FIG. 2 is an exploded perspective view showing how the boss portion of the mandrel, the protection ring, and the first shaft are coupled in FIG. 1, and FIG. An enlarged cross-sectional view showing the combination of the boss portion of the mandrel, the protection ring, and the first shaft, and FIG. 4 is an enlarged cross-sectional view showing the combination of the boss portion of the mandrel, the protection ring, and the second shaft, 5 is a perspective view showing the coupling relationship between the outer casing and the inner casing of the mandrel of the present invention.

1 to 5, the mandrel according to the present invention serves as a mold supporting a rubber strip and a composite material, for example, a pressure vessel or a pipe during molding, and includes a cylinder portion 110a and the cylinder portion. It includes a pair of first and second dome parts 110b disposed on the left and right sides of (110a) and a pair of first and second boss parts 110c coupled to the first and second dome parts 110b, Among them, the cylinder part 110a and the first and second dome parts 110b are a separable mandrel 110 having a structure in which a plurality of segments are assembled, and a separable first shaft detachably coupled to the first boss part 110c. (150a) and a separable second shaft (150b) detachably coupled to the second boss portion (110c).

Here, the pressure vessel can be used not only for pressure vessels used in the civil industry, but also for pressure vessels used in the military industry, such as combustion tubes and fuel tanks for missiles and aircraft.

The separable mandrel 110 of the present invention may be made of a metal material having high thermal conductivity, such as aluminum, for example, but is not limited thereto.

Protection rings ( 170) is published.

That is, the separable first shaft and the separable second shaft are not directly coupled to the first boss portion and the second boss portion, but are coupled through a protective ring interposed therebetween.

The separable first shaft 150a is inserted into the first boss portion 110c and may have a hollow pipe structure to supply high-temperature, high-pressure fluid to the outer passage of the main body 110 .

A flange portion 155 coupled to the first boss portion 110c is formed at one end of the separable first shaft 150a, and at one end of the separable second shaft 150b, the second boss portion ( 110c) is formed with a flange portion 155 coupled thereto.

The protection ring 170 extends along the circumferential direction of the cylindrical portion 171 inserted into the first boss portion or the second boss portion 110c and the cylindrical portion 171, and the flange portion 155 It consists of a disc portion 172 coupled to contact with.

In a state where the protection ring 170 is inserted into the first boss part or the second boss part 110c, the separable first shaft 150a or the separable second shaft 150b is inserted into the cylinder of the protection ring 170. After being inserted into the part 171, the first boss part 110c or the second boss part 110c, the protection ring 170, and the flange part 155 are integrally formed by using a fastening member such as a solder bolt. combine

Here, the first and second boss portions, the protective ring, and the flange portions of the first and second shafts are integrally coupled through solder bolts, thereby increasing resistance to bending and ensuring straightness of assembly. There are advantages.

In this way, since the separable first and second shafts 150a and 150b are inserted into the first and second bosses through the protection ring, damage caused by direct contact between the shaft and the protection unit can be prevented, and more Firm and precise bonding can be achieved.

An outer keyway 151a is formed on the outer circumferential surfaces of the first and second shafts 150a and 150b, respectively, and an inner keyway 173a is formed on the inner circumferential surface of the cylindrical portion of the protection ring. and the inner key groove are disposed at a position in contact with each other so that a key 173 is inserted.

As such, when the separable first and second shafts 150a and 150b are combined with the protection ring 170, the coupling position is guided by the key 173 inserted into the outer and inner key grooves 151a and 173a. The process of assembling the shaft to the mandrel becomes easy, and the precision of assembly can be secured.

On the other hand, in the present invention, since the separate first shaft and the second shaft are separated from each other instead of being connected to one long shaft structure, there is an advantage in that assemblability is improved and lightweight design is possible.

In particular, since the separable first and second shafts are inserted and fixed only to the first and second bosses provided at the left and right ends of the mandrel, the assembly time can be greatly reduced compared to the process of assembling a long shaft. The total weight of the shaft can be reduced by at least 20%, and the power required for mandrel rotation can be reduced due to the reduction in shaft weight.

In addition, it was experimentally confirmed that the combination structure of the separable shaft and the mandrel of the present invention rather reduces the deadweight deflection when compared to the case of employing a long shaft penetrating the mandrel.

Table 1 below shows the results of simulation of dead weight deflection and principal stress/yield strength according to the type of shaft coupled to the mandrel. Similarly, a separate first shaft and a second shaft are adopted.

Case Weight [Ton] dead weight deflection
[mm] Principal stress/yield strength shaft mandrel One 5.013 20.631 4.002 82.4MPa/220MPa 2 5.013 18.445 3.733 72.9MPa/220MPa 3 3.981 17.414 3.522 69.9MPa/220MPa

Looking at the dead weight deflection with reference to Table 1 above, it was confirmed that the dead weight deflection of Case 3 was 3.522mm, which was reduced compared to 4.002 and 3.733mm of Cases 1 and 2.

Looking at the principal stress/yield strength, it was confirmed that the principal stress/yield strength of Case 3 was 69.9MPa/220MPa, which was reduced compared to 84.4MPa/220MPa of Case 1 and 72.9MPa/220MPa of Case 2.

At one end of the separable first shaft 150a, when inserted into the first boss portion 110c, a plurality of pluralities formed along the circumferential direction so that the fluid supplied through the separable first shaft 150a is supplied to the outer passage. A supply hole 151 is formed.

At one end of the separable second shaft 150b, when inserted into the second boss portion 110c, a plurality of pluralities formed along the circumferential direction such that the fluid passing through the outer passage is discharged into the separable second shaft 150b. A discharge hole 152 is formed.

The fluid supplied through the first separable shaft 150a moves through an outer passage provided between the outer casing and the inner casing, and then is discharged to the outside through the second separable shaft.

In the separable mandrel of the present invention, the cylinder portion 110a, and the first and second dome portions 110b include an outer casing 120, an inner casing 130, and the outer casing 120 and the inner casing 130, respectively. It is configured to include an outer passage 127 provided therebetween and a partition 125 bent at an end of the outer casing 120 to partition the outer passage between the outer casing and the inner casing.

The inner casing 130 has an opening 131 provided at one end or the other end, and has a closed structure so that fluid does not flow into the inner space, and a position corresponding to the first dome part or the second dome part 110b. It may be exemplified that the sealing cover 133 is detachably installed. Ventilation holes 125a are formed in the compartment 125 to allow fluid to pass therethrough.

The present invention described above is only exemplary, and those skilled in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom. Therefore, it will be well understood that the present invention is not limited to the forms mentioned in the detailed description above. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims. It is also to be understood that the present invention includes all modifications, equivalents and alternatives within the spirit and scope of the present invention as defined by the appended claims.

110: detachable mandrel
110a: cylinder part 110b: first and second dome parts
110c: first and second bosses 120: outer casing
123: heat dissipation coating layer 125: compartment
125a: ventilation hole 127: outer flow path
130: inner casing 131: opening
132: insulating coating layer 133: sealing cover
135: O-ring for sealing 150a, 150b: first and second shafts
151: supply hole 151a: outer keyway
152: discharge hole 155: flange part
170: protection ring 171: cylinder
172: disk part 173: key
173a: inner keyway

Claims (6)

A cylinder part, a pair of first and second dome parts disposed on left and right sides of the cylinder part, and a pair of first and second boss parts coupled to the first and second dome parts, The dome portion includes a separable mandrel each having a structure in which a plurality of segments are assembled;
a detachable first shaft detachably coupled to the first boss;
It includes; a detachable second shaft detachably coupled to the second boss part,
The coupling structure of the detachable shaft and the mandrel, characterized in that the detachable first and detachable shafts are separated from each other without being connected, thereby improving assemblyability and enabling a lightweight design.
According to claim 1,
A coupling structure between a separable shaft and a mandrel, characterized in that a protection ring is interposed between the first boss portion and the separable first shaft and between the second boss portion and the separable second shaft, respectively.
According to claim 2,
Flange portions coupled to the first dome portion and the second dome portion are formed at one end of the separable first shaft and the second shaft, respectively.
The protection ring is composed of a cylindrical portion inserted into the first boss portion or the second boss portion, and a disk portion extending along the circumferential direction of the cylindrical portion and abutting and coupled to the flange portion,
In a state where the protection ring is inserted into the first boss part or the second boss part, the separable first shaft or the separable second shaft is inserted into the cylindrical part of the protection ring, and then the first boss part is used by a fastening member. Or a coupling structure of a separable shaft and a mandrel, characterized in that integrally coupling the second boss portion, the protection ring, and the flange portion.
According to claim 1,
The cylinder part and the plurality of segments constituting the first and second dome parts have a structure in which an outer casing and an inner casing are combined,
Adjacent outer casings are coupled through fastening members in a state where the partitions formed at each end come into contact with each other,
The inner casing is coupled structure of the separable shaft and mandrel, characterized in that coupled through the partition and the fastening member.
According to claim 4,
An outer flow path is formed between the outer casing and the inner casing,
The outer flow path is partitioned by the partition, characterized in that in communication through ventilation holes formed in each partition and mandrel coupling structure.
According to claim 3,
The first and second boss parts, the protective ring, and the coupling part in which the flange parts of the first and second shafts are integrally coupled are combined with shoulder bolts to increase resistance to bending and to secure straightness of assembly,
The protective ring and the first and second shafts are coupled in such a way that a key is inserted into a key groove formed thereon, thereby increasing ease and precision of assembly.

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