KR20040049545A - Manufacturing process of X-RAY table and CT table - Google Patents

Abstract

PURPOSE: A method for fabricating an X-ray inspection table and a CT inspection table is provided to improve the transmissivity by smoothening each surface of a top and a bottom prepreg. CONSTITUTION: A top mold is loaded and fixed on a bottom mold by using bolts in order to press an upper surface of a top prepreg. The top and the bottom molds are transferred into a furnace. The top and the bottom molds are heated during 3 to 5 hours under the high temperature of 125±5 degrees centigrade. The binding force between a top and a bottom prepreg(3a,3b) and the binding force between a core(2) and the top and the bottom prepreg are improved by the tension of the core due to the heat. Each surface of the top and the bottom prepregs are smoothened by increasing the binding force.

Description

Manufacturing process of X-ray inspection and Citi inspection {Manufacturing process of X-RAY table and CT table}

The present invention relates to a method of manufacturing a table (TABLE: or BED) used for X-ray and CT (computed tomography) examination.

In general, X-RAY examination and CT examination are used to diagnose or examine lesions of the human body, and the apparatus that the patient lays down to take X-RAY is called X-RAY table, and for computed tomography The device on which the patient lies is called the CT table.

In general, since X-RAY table and CT table require high transmittance and excellent mechanical strength, they are mostly made of CARBON.

In the prior art, the X-RAY table and the CT table are manufactured by a hand lay-up method and a vacuum bagging molding method.

In addition, the method of manufacturing the X-RAY table or CT table manufactured by the hand lay-up method or the vacuum forming method is the same, except that the X-RAY table is formed in a flat plane on the upper and lower surfaces, Since the upper and lower surfaces show only the difference formed by the curved surface, in describing the method of manufacturing the X-RAY and the CT table by the hand layup method and the vacuum molding method, the respective components are described using the same names and the same reference numerals. do.

11 and 13 are views showing the manufacture of the X-RAY table and CT table by the hand lay-up method, this method is a molding groove formed in an open state on the upper surface of the one-piece molding mold 100 Lay-up polyester or epoxy resin at room temperature with fabric or cloth woven from glass fiber or carbon fiber on the bottom of 101. The liquid 204 is poured onto the fabric and the resin liquid 204 is applied to the fabric by using the manual roller 300 to form a primary fabric resin layer having a constant thickness (0.1 to 1.0 mm). Repeating the method of forming the secondary fabric resin layer by repeating the fabric on the primary fabric resin layer of the second fabric impregnated and applied to form the secondary fabric resin layer several times of the lower fabric resin layer (201) To ensure that the overall thickness is Well, the core fabric (CORE: 202) made of acrylic foam, urethane foam, or PVC foam prepared in advance as designed on the lower fabric resin layer 201, and then the lower fabric resin layer ( After forming the upper fabric resin layer 202 by the worker's intuition so as to have a thickness almost the same as the lower fabric resin layer 201 in the same manner as the forming method 201), it is cured at room temperature without pressing as it is. Manufactures X-RAY and CT tables,

12 and 14 are views showing the manufacturing of the X-RAY and CT table by the vacuum molding method, this method also forming grooves 401 is formed with the upper surface of one molding mold 400 is open state ) By forming a plurality of layers of glass fiber prepreg or carbon fiber prepreg impregnated with resin on the bottom to form a lower prepreg layer 501 having a total thickness desired by the designer. On top of that, a core 500 made of expensive PMI foam, which is prepared in advance as designed, is laminated, and a plurality of layers of glass fiber prepreg or carbon fiber prepreg are laminated on the core, and the lower prepreg layer 501 is almost finished. Then, the upper prepreg layer 502 is formed, and then the release film 600 and the breather 700 are sequentially stacked on the upper prepreg layer 502, and finally the vacuum back film 800 is applied. After sealing the four edges of the vacuum bag film 800 with a sealant (such as rubber tape), the inside of the vacuum bag film 800 is vacuumed using a vacuum pump while maintaining the airtight state. X-RAY and CT tables are manufactured in such a way that the bonding between the glass fiber prepreg or carbon fiber prepreg layers (LAYER) and the bonding between the upper and lower prepreg layers and the core are performed at a negative pressure simultaneously.

However, the X-RAY table and the CT table manufactured by the hand layup method and the vacuum molding method of the prior art have various problems.

First of all, the X-RAY table and CT table manufactured by the hand lay-up method have a low content of reinforcing fiber (glass fiber or carbon fiber), so it is difficult to expect excellent mechanical strength, and it has a fatal problem of heavy weight due to high resin content. In addition, the thickness of the upper and lower fabric resin layers and the resin impregnation amount is uneven, so that the X-RAY transmittance is uneven for each part, and because the fabric resin layer is formed manually, the lower fabric resin layer is formed on the bottom of the molding groove. There is a problem in that it is not in close contact with the plane and the bumpy concave-convex surface is formed or bubbles are formed to lower the X-RAY transmittance.

In addition, X-RAY and CT tables manufactured by vacuum forming method cannot use low-cost acrylic foams, urethane foams or PVC foams as cores in the manufacturing process, and use expensive core PMI foams. In addition, the PMI foam core has to be machined separately to make the shape desired by the designer. In addition, each time the glass fiber and carbon fiber prepregs are stacked one by one, a separate compaction (COMPACTION: vacuum press, release film / breather) It must be repeated several times as an intermediate process necessary to improve the bonding strength between layers of prepreg by sealing using vacuum vacuum film / sealant. This creates a large number of bubbles on the surface, incomplete vacuum or perfect sealing. In case of failure, the adhesion between glass and carbon fiber prepreg layers and the adhesive strength between prepreg and core are weakened or peeling occurs, so there is always a risk of problems in terms of mechanical strength. As mentioned above, the complex manufacturing process, the use of expensive PMI foam cores, unnecessary compaction process, burdensome materials cost (release film, breather, vacuum back film, sealant, etc.) and numerous bubbles on the surface Due to the loss of price competitiveness due to the inevitable addition of the painting process, it is impossible to expect the expected effect of increasing sales, satisfying customers' demands, and increasing exports. In addition, special tools (prepreg and mold release material) are required by hand when prepreg is laminated. Easy to rub with hand, eg Teflon The pre-preg is rubbed and laminated on the mold surface using the lamination tool made in this way.The part rubbed with a special tool has good joining with the mold surface, and the other part is not prepreg and prepreg and the prepreg and mold surface. Not only does the bonding work well, but it may cause peeling later, and resin may collect on one side or bubbles may be generated, which may adversely affect X-ray transmission, or may be bonded between the prepreg and the prepreg by a special tool. Even if this is done well, because the pressure is applied only by the vacuum pressure, the prepreg laid on the bottom is not properly delivered because the vacuum pressure is not properly delivered, so that the perfect bonding is not achieved due to insufficient pressure or the resin is gathered to one side and bubbles are generated. It is the cause of lowering the transmittance, and the vacuum pressure alone is used for X-RAY and CT table. Since it is not enough to make the overall pressure evenly, it is impossible to see the front and back of the product after demolding the product from the mold. It is pointed out as a problem that adversely affects.

The present invention was created in order to solve the problems described in the prior art as described above, and the means for assembling the upper mold on the upper surface of the lower mold formed with a molding groove for forming the X-RAY table and CT table, It is a means to put upper and lower molds into a heating furnace to heat them to high temperature, and it is possible to manufacture X-RAY and CT table that can improve the transmittance of X-RAY and computed tomography by forming smooth surface without bubble on the front and back. It was invented for the purpose of making it possible.

The present invention as a means for achieving the above object,

After preparing the lower mold formed with the molding groove open, any one of the prepregs selected from the glass prepreg coated with the resin liquid or the carbon prepreg is cut in accordance with the above-mentioned molding groove standards, and stacked on the bottom of the mold. Forming a lower prepreg layer having a predetermined thickness, stacking cores on the lower prepreg layer, and any one of prepreg selected from glass prepreg or carbon prepreg on the top of the core. In manufacturing the X-RAY and CT table, including the step of forming the upper prepreg layer having a predetermined thickness by laminating so as to overlap,

Placing an upper mold on the lower mold so as to press the upper surface of the upper prepreg layer while being in contact with the pressing surface, and coupling the upper mold to the lower mold as a bolt;

The upper and lower molds combined and assembled in the above process are put into a heating furnace and heated at a high temperature of 125 ° C. ± 5 ° C. for about 3 to 5 hours, thereby spontaneously expanding the core in the mold by secondary foaming by the high temperature. The bonding force between the multiple prepregs and prepregs forming the upper and lower prepreg layers, and the bonding force between the upper and lower prepreg layers and the core are improved, and the upper and lower prepreg layers are formed into upper and lower molds. Pressing and tightly contacting the groove and the pressing surface to form a smooth surface of the upper and lower prepreg layers;

In addition, the upper and lower surfaces when demolding is characterized in that to produce a X-RAY and CT table having a smooth surface with little bubbles.

The core embedded between the upper and lower prepreg layers may be one selected from acrylic foam, urethane foam, and plastic foam, which cause secondary foaming to expand in volume due to high temperature around 100 ° C. ,

In addition, the bottom of the forming groove of the lower mold is a flat plane, and the pressing surface of the upper mold is also characterized in that the X-RAY table is formed by forming a flat plane both upper and lower surfaces,

In addition, by using the bottom surface of the molding surface of the lower mold and the pressing surface of the upper mold is a curved surface curved in the same direction is characterized in that the CT table formed in the upper and lower surfaces are curved.

1 and 2 are cross-sectional views of X-RAY and CT tables for explaining the present invention.

3 to 6 is a manufacturing process of the X-RAY table of the present invention.

7 to 10 is a manufacturing process of the CT table of the present invention.

11 and 12 are prior art for manufacturing an X-RAY table.

13 and 14 are prior art for manufacturing a CT table.

※ Explanation of code for main part of drawing

1a: X-RAY table 1b: CT table

2: core 3a, 3b: upper and lower prepreg layers

4: lower mold 5: upper mold

31,32: prepreg 41: forming groove

51: pressure surface 42, 52: bolt assembly

6: bolt

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are cross-sectional views of the X-RAY and CT table for explaining the present invention, Figures 3 to 6 is a manufacturing process diagram of the X-RAY table of the present invention, Figures 7 to 10 are CT of the present invention Shown in the manufacturing process of the table,

Reference numeral 1a denotes an X-RAY table, 1b denotes a CT table, and the X-RAY table 1a and the CT table 1b are different in appearance. That is, the X-RAY table has a flat top and bottom surfaces. On the other hand, the CT table 1b shows a difference in that the upper and lower surfaces are formed as curved surfaces instead of flat surfaces, and each component is manufactured by the same manufacturing process using the same material. Therefore, in the present invention, in describing the manufacturing method of the X-RAY table and the CT table (1a) (1b) it will be described a manufacturing process using the same name, the same reference numerals for each component.

1 and 2 illustrate cross-sectional views of an X-RAY table and a CT table. The X-RAY table 1a and the CT table 1b include a core 2 embedded therein and a core ( It consists of the upper and lower prepreg layers 3a and 3b formed in the state which wrapped the upper and lower parts of 2).

The core 2 is used to be processed to a predetermined standard that is primarily foamed by a separate manufacturing process, one of the features of the present invention is the material of the core (2) made by solidifying by primary foaming is heated again When heated to a high temperature around 100 ℃ in the process of using a material that has the characteristic of expanding the volume spontaneously by spontaneous expansion, the material is any of the synthetic resin foam group such as acrylic foam, urethane foam, plastic products One is selected.

Another feature of the present invention is the upper and lower prepreg layer (3a) (3b) is a resin pre-coated glass prepreg (Glass Prepreg) or carbon prepreg (Carbon Prepreg) in a state where a plurality of stacked When heated to 100 ° C. or more, due to the expansion force of the secondary foam of the core 2, each of the prepregs stacked on the upper and lower prepregs in a plurality of sheets is bonded together with each other, and the upper and lower preps The adhesion between the leg layer and the core is improved, and the expansion pressure of the core causes the upper and lower prepreg layers to be pressed onto the mold surface so that the surface of the upper and lower prepreg layers forms a smooth surface with almost no bubbles. .

As described above, a process of manufacturing the X-RAY table 1a and the CT table 1b in which the surfaces of the upper and lower prepreg layers 3a and 3b are made of smooth surfaces will be described.

Prior to describing the manufacturing process of the present invention, the lower mold and the upper mold for forming the X-RAY table 1a and the CT table 1b will be described.

First, the lower mold 4 for manufacturing the X-RAY table (1a) is formed with a forming groove 41, the top of which is open as shown in Figures 3 to 6, the forming groove 41 The bottom of is formed in a flat plane. In addition, a plurality of bolt assembly holes 42 are formed at appropriate intervals around the molding groove 41.

And the lower surface of the upper mold (5) for manufacturing the X-RAY table (1a) is formed with a flat plane pressing surface 51 covering the upper portion of the forming groove 41 of the lower mold 4 (Fig. 6), and bolt assembly holes 52 are formed at appropriate intervals around the pressing surface 51 as well.

Accordingly, the upper and lower molds 5 and 4 are provided by means of screwing the upper mold 5 through the bolt 6 through the bolt assembly holes 52 and 42 in a state where the upper mold 5 is placed on the lower mold 4. Coupling can be assembled, the upper and lower molds coupled by the bolts 6 can withstand the expansion force due to secondary foaming of the core 2 to be described later.

Next, the lower die 4 for manufacturing the CT table 1b is also formed with a forming groove 41 in an open top, the bottom of the forming groove 41 is shown in Figs. As described above, a plurality of bolts are formed in the curved surface, and a plurality of bolt assembling holes 42 are formed at appropriate intervals around the molding groove 41.

In addition, an upper mold 5 for manufacturing the CT table 1b is also provided with a pressing surface 51 for covering the molding groove 41 on the lower surface thereof. The pressing surface 51 is illustrated in FIG. 10. It is formed as a curved surface protruding toward the forming groove as described above, and also a plurality of bolt assembly holes 52 are formed at appropriate intervals around the pressing surface 51 of the upper mold (5).

Accordingly, when the upper mold 5 for manufacturing the CT table 1b is placed on the lower mold 4 and the bolt assembly holes 52 and 42 are fastened with the bolt 6, the upper and lower molds are firmly coupled. It is assembled in the state.

A process of manufacturing the X-RAY table 1a and the CT table 1b using the upper and lower molds 5 and 4 as described above will be described below.

3 and 7 show that the preforms 31 selected from a glass prepreg impregnated with resin or carbon prepreg 31 are stacked so as to overlap each other in the molding groove 41 of the lower mold 4. In the present invention, the prepreg 31 is a stack of a plurality of pre-cuts cut in advance in accordance with the standard of the forming groove 41, as described above, the prepreg 31 overlapping multiple sheets of 0.2 ~ 0.5mm The thick ones are stacked so that they have a stacking thickness of about 1.0-3.0 mm.

4 and 8 show that the cores 2 are inserted and stacked on the prepregs 31 in which several sheets are stacked in the forming grooves 41 of the lower mold 4, and the cores 2 are stacked. Is pre-molded in a state of primary foaming by a separate manufacturing process, the core (2) formed in the primary foam in this way is secondary foaming action when heated to a high temperature around 100 ℃ during secondary heating The one with the rising material is used. For example, any one material selected from the group of synthetic resins such as acrylic foam, urethane foam, and plastic foam is used.

In addition, the core (2) is divided into X-RAY table (1a) manufacturing and CT table (1b) manufacturing, in the case of X-RAY table manufacturing, both upper and lower surfaces are formed in a flat plane, for CT table manufacturing In the case, the upper and lower surfaces are curved surfaces formed into relatively gentle curves.

5 and 9 illustrate one of prepregs selected from glass prepreg or carbon prepreg in which resin liquid is impregnated on the upper surface of the core 2 inserted into the molding groove 41 of the lower mold 4. It is shown that the (32) is laminated in a plurality of overlapping state, the prepreg 32 in this process is cut to the same standard as the upper surface of the core 2 is used, and the prepreg (32) In addition, several sheets having a thickness of 0.2 to 0.5 mm are stacked to have a stack thickness of about 1.0 to 3.0 mm.

6 and 10 show that the upper mold 5 is placed on the upper surface of the lower mold 4 and assembled with bolts 6 to complete molding of the X-RAY and the CT table. ) Is coupled to the lower mold 4 in a state in which the pressing surface 51 formed on the lower surface thereof is in close contact with the uppermost prepreg 32 stacked on the upper surface of the core 2. The upper and lower molds (5) and (4) combined and assembled by the same are put into a heating furnace and heated at a high temperature of 125 ° C ± 5 ° C for about 3 to 5 hours, wherein the cores embedded in the upper and lower molds ( 2) is a secondary foaming action occurs when it reaches a state heated to a high temperature around 100 ℃, by the secondary foaming action such that the core 2 itself is a volume expansion phenomenon, the core ( Since the upper mold 5 forcibly suppresses the expansion of 2), the core 2 The upper and lower prepreg layers are more strongly bonded to the core 2 because the expansion pressure acts on the upper and lower prepreg layers 3a and 3b surrounding the core 2 without expanding in quality. The expansion force due to the secondary foaming of the core 2 causes the multiple prepregs 32 and 31 forming the upper and lower prepreg layers 3a and 3b to be bonded to each other. The upper prepreg layer 3a is in close contact with the pressing surface 51 of the upper mold 5, and the lower prepreg layer 3b is in close contact with the bottom surface of the forming groove 41 of the lower mold 4.

On the other hand, when the core 2 is heated to the secondary foaming temperature as described above, since the upper and lower prepreg layers 3a and 3b surrounding the core 2 are also heated to a high temperature, the prepreg 32 Since the resin liquid impregnated in (31) is pressurized by the expansion pressure of the core 2 in a state of being melted to some extent by high temperature, each prepreg forming the upper and lower prepreg layers 3a and 3b. They are bonded together in a mixed state, and thus, an air layer that exists between prepregs when laminating air bubbles or prepregs that are present between fiber tissues when the resin solution is impregnated into glass fibers or carbon fibers in advance. Is not present in the upper and lower prepreg layers due to the expansion pressure due to the secondary foaming of the core 2 and is pushed toward the bottom of the pressing surface 51 and the forming groove 41, Through the gap Portion is discharged.

Therefore, after completing the heating process as described above, the upper and lower molds are removed from the heating furnace, cooled to room temperature, and then demolded, and the upper and lower prepreg layers 3a and 3b have almost no bubbles in the inside and the surface, respectively. It will be able to produce the X-RAY table (1a) and CT table (1b) with.

According to the present invention as described above, the work process of stacking the glass fiber or carbon fiber prepreg impregnated with the resin liquid to the upper surface of the molding groove and the core of the lower mold is stacked one by one as in the conventional hand layup method Compared to the process of laying the fabric, applying polyester resin or epoxy resin on it, and impregnating with a manual roller several times, it is possible to reduce time and effort, and to assemble the upper mold on the lower mold and bolt The process of joining and then heating the furnace is much shorter than the compaction process (vacuum compression process) in which the release film, breather, vacuum back film, and sealant are sequentially installed in the vacuum forming method of the prior art. In addition, in the vacuum molding method of the prior art, inexpensive PMI foams are used in the present invention. Since it uses reel foam, urethane foam or plastic foam, it has the effect of cost competitiveness, and the bonding force between the prepreg of the upper and lower prepreg layers and the bonding force between the prepreg layer and the core by the secondary foam expansion pressure of the core. This excellent invention is a useful invention that can be produced in a good quality of X-RAY and CT table with excellent bubble-free and smooth surface to improve the transmittance of X-RAY and CT.

Claims (4)

After preparing the lower mold formed with the molding groove open, any one of the prepregs selected from the glass prepreg coated with the resin liquid or the carbon prepreg is cut in accordance with the above-mentioned molding groove specifications, and stacked on the bottom of the mold. Forming a lower prepreg layer having a predetermined thickness, stacking cores on the lower prepreg layer, and any one of prepreg selected from glass prepreg or carbon prepreg on the top of the core. In manufacturing the X-RAY and CT table, including the step of forming the upper prepreg layer having a predetermined thickness by laminating so as to overlap, Placing an upper mold on the lower mold so as to press the upper surface of the upper prepreg layer while being in contact with the pressing surface, and coupling the upper mold to the lower mold as a bolt; The upper and lower molds combined and assembled in the above process are put into a heating furnace and heated at a high temperature of 125 ° C. ± 5 ° C. for about 3 to 5 hours, thereby spontaneously expanding the core in the mold by secondary foaming by the high temperature. The bonding force between the multiple prepregs and prepregs forming the upper and lower prepreg layers, and the bonding force between the upper and lower prepreg layers and the core are improved, and the upper and lower prepreg layers are formed into upper and lower molds. Pressing and tightly contacting the groove and the pressing surface to form a smooth surface of the upper and lower prepreg layers; The method of manufacturing a table used for X-ray inspection and Citi inspection, characterized in that to enable the manufacture of X-RAY and CT table having a smooth surface with almost no bubbles on the upper and lower surfaces when demolding. The method of claim 1, The core embedded between the upper and lower prepreg layers is X-ray inspection, characterized in that to select any one of the acrylic foam, urethane foam, plastic foam causing the expansion of the volume by the high temperature around 100 ℃ Method of manufacturing a table used for citi inspection. The method of claim 1, X-ray inspection and Citi-test, characterized in that the bottom of the forming groove of the lower mold is a flat plane, the pressing surface of the upper mold is also a flat plane to manufacture an X-RAY table formed in a flat plane both upper and lower surfaces Method for manufacturing a table used for. The method of claim 1, The bottom surface of the lower mold and the pressing surface of the upper mold is used for the curved surface curved in the same direction, the upper and lower surfaces are used for X-ray inspection and Citi test, characterized in that for producing a CT table Method of making a table.