KR100260774B1 - Injection molding apparatus of the frp pump - Google Patents

Abstract

PURPOSE: A molding device is provided to complete production of excellent quality with resin molding that allows durability and intensity proper to an FRP(fiber reinforced plastic) pump at a reasonable production cost. CONSTITUTION: By operation of one screw jack(1), an operating plate(15) and a lower fixing plate(14) are combined by levers(4,5) connected to a screw gear and stopped sensed by a positional detection sensor(22) arranged at a lower molding frame(19). A left and right operating plate(20) acting by operation of levers(9,10) is combined to the operating plate(15) and to the lower fixing plate(14), then finished by a positional detection sensor(23) additionally mounted in the left and right operating plate(20). Further, a frame performing up and down movement vertically is open and closed. A frame moving left and rightward at the same time is composed to accomplish combination of frame and separation by action of one screw jack and the levers with less power. Therefore mass production system is facilitated with simple and cost saving facility.

Description

Resin Injection Molding Equipment of FRP Pump

The present invention relates to a pump molding apparatus and a molding resin composition method made of glass fiber reinforced plastic (hereinafter referred to as FRP), the molding method is a resin injection (hereinafter referred to as RI molding) equipment and mold peripheral equipment and resin materials, etc. In the field of manufacturing, it is equipped with mass production system by automation, and the improvement measures such as saving manpower, material saving, and power consumption are needed. Especially, good quality products are produced at low cost with resin composition which gives durability improvement and strength suitable for FRP pump. The purpose is to complete it in cost.

In the manufacture of conventional FRP pumps, the FRP laminate is primarily formed by the hand lay-up method (manual method) by a simple structure that is easy for demoulding, the curve of which is not deep. It has been manufactured by the method.

Since this processing method is operated separately for each medium, its precision dimensions are different, and thus the product cannot be standardized, and its productivity is extremely low. The glass fiber, which is the Naga reinforced side, is exposed and is made of a method to return the corrosion resistant resin layer to a free state.

Therefore, in order to make up for this drawback, the area is topcoated again with resin, which makes it seemingly plausible, but the chip forms an extremely thin layer and shows great vulnerability to the corrosion resistance, which is the original purpose of the FRP pump. I am admitted to both users.

In addition to the shortcomings of these deadly products, the recent trend of plastic products manufacturing has high technology and processing technology has been developed based on high value-added stable production, and it is the age of ultra-precise mold and new molding processing technology. However, the above-mentioned method is also a task that must be urgently improved in a way that is far behind the request of the times for quality improvement.

Therefore, it is urgent to switch from the conventional hand lay-up method to the mechanical molding, which is an RI molding method, but the process includes a prefoaming process which is never neglected.

There are two methods of manufacturing this preform of glass fiber, the direct preform method and the stamp preform method. In the direct pre-form method, glass furnace-bing is cut into a low-bing cutter about 50mm and blown with a liquid binder into a small preformer, or suction-bound with a decompression device and dried to remove it from the mold. As a stamp preform method, there is a method of preparing a larger preformer which prepares a glass fiber continuous strand and attaches to it, heats it to a temperature at which the organic binder softens, and compresses and molds it into a predetermined shape. Compared to the direct preform method, this method is known for its high production efficiency due to continuous production processing. In any case, these preform molding methods require installation of special equipment, which requires a considerable amount of installation costs. Also, a manufacturer who desires the difficulty of forming a preform having a complicated shape of a pump and a relationship that requires technical skill in operation is easily available. The situation is not practicing.

Recent FRP molding process is difficult to produce high value-added products unless high-tech process is solved, and the key to lowering manufacturing cost is a mechanized mass production system based on technology conversion and stable production of high quality products. As a response that remains at a level dependent on the manual process of the simple molding condition and the process according to the secondary processing described above, it is too far behind the demands of the era of pursuing superior products in any aspect. As part of the development of the molding process to improve.

As is well known, the RI molding method inserts a glass fiber prefoam in advance into a cavity formed by a space formed by a press coupling between a fixed side mold and a movable side mold, and uses an oil-free material (unsaturated polyester resin, hereinafter referred to as resin). Refers to the molding method which is dismantled and drawn out of the mold after being injected and cured

In the RI molding method, a pin rod-shaped mold (21) attached to the left and right movable plates (20) of FIG. 1 by shrinkage action due to the curing property of the resin used for curing the resin forming the FRP laminate in the mold. It is not easy to draw (sometimes not possible by manpower) of the work flow is a big obstacle to the flow of the work, in particular, the inventors filed "Wedge-embedded self-absorbing centrifugal pump" (patent) Application number: 97-36088) is more difficult in the process of drawing the wedge frame 36 (see Fig. 3) for forming a groove having a curved curve as a place to insert the wedge in the pump casing. Following.

The present invention is applied to commercially available screw jack and lever structure to make the coupling and disassembly of the mold, and insert the rod-shaped mold drawing work with a low energy consumption as a way to solve the advantages, the molding operation is simple and stable and In addition to improving the peripheral equipment of the RI molding method, which is adapted to mass production at low cost, and the improvement of the resin material in the RI molding, the above-mentioned difficulties are intervened and the manufacturing method leading to the elimination of the preformer process has been developed. .

This preformer process in RI molding is provided in Japanese Patent Publication No. Hei 6-87128, which provides a technical means for improving work efficiency. Continous stranmat is also used. In 91666, there is a proposal to omit the preform process and in Pyeong 6-155483, there is a content of providing an FRP molding method corresponding to the unnecessary and complicated shape of the preform, but it is also the same that a glass fiber mat is used.

In the present invention, it is essential for the RI molding method, and is a means for eliminating the process that requires the difficulty of the work and its equipment and working time, firstly, the content and form of the glass fiber to satisfy the strength suitable for the FRP pump. As a result of reviewing the results, it is possible to avoid the use of mats and to succeed in blending resin materials that obtain satisfactory strength as a pump casing using glass fibers chopped to a predetermined length.

1 is an exemplary view when the molding die of the resin injection molding apparatus of the FRP pump according to the present invention is demolded.

2 is an exemplary view when the molding frame of the resin injection molding apparatus of the FRP pump according to the present invention is combined.

3 is an exemplary view when the wedge mold of the resin injection molding apparatus of the FRP pump according to the present invention is coupled to the wedge.

* Explanation of symbols for main parts of the drawings

(1st and 2nd degree)

1: Screw Jack 2: Screw Gear (Front)

3: screw gear (rear) 4: lever (A)

5: lever (B) 6: screw gear connection joint (front)

7 Universal joint 8 Screw gear connection joint (rear)

9: lever (C) 10: lever (D)

11: intermediate starting joint 12: movable plate connection joint

13: upper fixing plate 14: lower fixing plate

15: movable plate 16: upper fixing plate joint

17: movable plate joint 18: upper mold

19: lower mold 20: left and right movable plate

21: rod-shaped frame 22, 23, 25: position detection sensor

24: Dipper

(Figure 3)

31: screw jack 32: screw gear

33: screw gear connection joint 34: lever (A)

35: lever (B) 36: wedge frame

37: center lever lever 38: pump casing

39: wedge

In the RI molding method, the combination of two male and female molds is usually performed by bolt or clamp type joining operation. However, recently, the mold is joined by hydraulic or pneumatic pressure, and mechanical precision and rapid automation are achieved in the high cycle of the machine. It has been improved to cope. However, in the present invention, in order to improve the corrosion resistance as well as the wear resistance of the FRP pump, in addition to mixing the glass fiber 에 as a reinforcing agent in the resin, various kinds of fillers are mixed. Since the facility is not suitable, the detailed description will be described next as an improvement focusing on productivity improvement due to mechanization that meets this characteristic.

In the present invention, the FRP pump in which the glass fiber is mixed with the resin as a means for eliminating the pre-form process using the glass fiber mat, which is a difficulty in the RI molding method, is cut to a length of 9-10 mm. Satisfactory strength as a casing was obtained. Longer than 20mm, there was a problem in stability of the flow of the injection resin, and the hardening of the lamination was weak at 5mm or less, especially at 1.5-2mm, which caused cracks or resin fragments to collapse near the bolts. There was a case.

Therefore, the preferred fiber length was found to be 6-10 mm.

Next, the filler was added to the mixing process to find a means to improve wear resistance, which is one of the drawbacks of the conventional FRP pump.

The mixing ratio and method of the filler taken by the inventors are as follows.

First, the heating operation to improve the flow of the resin is well known fact that the short-term resin is at a minimum viscosity of about 40 ℃, in the present invention is about 100 ℃ due to the inclusion of a filler such as silica powder It was found to be the lowest viscosity, but the viscosity was significantly lowered at around 70 ° C, so it was carried out at a temperature of about 70 ° C on the work piece.

The resin filler compounding ratio was 30 parts of unsaturated polyester, 15 parts of silica powder (＃ 500), 15 parts of silica powder (＃ 325), 10 parts of barium sulfate, and 23 parts of glass fiber, and the resin was heated to around 70 ° C. The filling was added to 90% of the amount of resin, and the mixture was kneaded with a kneader for about 5 minutes, and then the glass 촙 measured while stirring was added 2-3 times in 2 minute intervals, and the stirring was continued for about 5 minutes. 10% of the resin was added and mixed for 10 minutes, and finally 0.5 parts of magnesium oxide and 0.2 parts of MEKPO, a resin curing catalyst, were added and stirred for 1 minute to complete the composition of the resin composition.

This mixed resin had no problem in the injection operation of the RI injection nozzles, and the glass fibers in the molding laminate were evenly distributed. This desirable phenomenon is a phenomenon that glass flock is concentrated in the resinous end, but it is not possible to clarify it, but it is probably caused by the narrowing of the filling.

The wear rate (WR) of the plastic is proportional to the pressure (P) and the moving speed (V) of the contact surface, and is expressed as WR = K.PV and K is the wear factor, which is determined by the material. As a result of the simple abrasion tester, which was manufactured by itself according to the principle of a rotating disk tester according to ASTM (D 3702-78), the comparison value between the laminate of compounding resin and 12% glass fiber laminate on the resin end was average 3 It was found that the wear resistance was improved more than twice.

In the above-described RI molding method, a method of blending a resin for omitting a preform process has been described. The difficulty in coupling and demolding the RI molding frame, which is one of the objects of the present invention, will be described with reference to the accompanying drawings.

FIG. 1 illustrates a state in which the mold 18 and the movable plate 20 attached to the movable plate 15 and the lower fixing plate 14 are demolded, respectively. The release agent application | coating, and sometimes a gel coat operation is possible, The double right and left movable plate 20 is attached with the rod-shaped mold 21 for forming the discharge port of a pump.

Now, when the screw jack (1) is driven by a motor (not shown) in joining the three-part mold, which is the main part of the RI molding method, the screw gear (front) (2) and the screw gear (rear) (3) This reversal (arrow direction shown in the lower left and right in the drawing) is connected to the screw gears 2 and 3, and the levers A, B and 4 and 5 having different lengths, respectively, have the upper fixing plate 13 and the movable plate ( 15) Receiving the resistance of the universal joint (starting point) 16, 17 located in the center of the movable plate 15 is lowered along the line of the diper 24 is coupled to the lower fixing plate (14).

In the present invention, the structure using the screw gear (rear surface) 3 of the screw jack 1 as well as the structure of the mold which performs only this conventional press-up and down movement is characterized. That is, the lever gears 9 and 10 having different lengths in the screw gear (rear) 3 are allowed to operate left and right about the midpoint joint 11. The levers 9 and 10 are provided with a trough structure for absorbing the distance change of the levers 9 and 10 due to left and right operation. As a result, the structure in which the left and right movable plates 20 are moved to have a coupling direction different from the vertical movement of the movable plate 15 enables the molding of the discharge port in the manufacture of the pump. As a result, by operating one screw jack (1), the three parts of the mold are combined at the same time despite different angles, resulting in the efficiency and convenience of the work. The end of the coupling is the position detection sensor attached to each mold. The motor of the screw jack 1 is automatically stopped by the detection of (22, 23), so that the resin injection is completed in the combined state as shown in FIG.

The dismantling in the mold is performed by reverse rotation of the screw jack 1 in the reverse order, and the dismantling operation is performed by the detection of the position detection sensor 25 attached to the upper limit of the movable plate 15 attached to the diper 24. This was done.

3 shows the forward and backward operation of the screw gear 32 used for the insertion or demoulding of the wedge mold 36 to form a curved curved groove into the wedge 39 to be inserted into the pump casing 38. By operating the lever (A) (B) (34, 35) by way of example, it is an exemplary diagram that mechanically and powerfully draw the wedge 36.

This operation is different from the indirect energy driving mechanism such as the hydraulic mechanism or the compressed air as it is a screw jack and lever type operation.The hydraulic pump, the pressure tank or the compressor and the air tank, and the corresponding high pressure pipeline and the automatic control device Since expensive equipment is unnecessary and all of them require constant operation to maintain a constant pressure all the time, it is pointed out that there is an energy loss and the invisible waste is pointed out. It is a method that greatly contributes to.

As described above, the present invention enables the following effects by improving the resin used in the manufacture of the FRP pump by the RI molding method and the configuration of the peripheral device.

The structure that opens and closes the frame that moves up and down in the vertical direction and forms the frame that moves to the left and right at the same time, by combining the mold and demolding operation at the same time with a small power by the operation of one screw jack and lever, It is an energy-saving device that solves the complexity and difficulty and provides a mass production system with simple and inexpensive equipment.

In addition, the preform process, which was indispensable in the previous RI molding method, is a resin mixture that achieves dispersibility of the glass by mixing the glass fiber chopped to a predetermined length with a resin and adding a filler to improve wear resistance. The company also provided a new method that greatly contributed to the productivity improvement by eliminating the pre-form process that requires skill.

Claims (1)

The movable plate 15 and the lower fixing plate 14 are engaged by the operation of the levers 4 and 5 connected to the screw gears (front) 2 by the operation of one screw jack 1, and the lower mold 19 The left and right movable plates 20, which are sensed and stopped by the position detection sensor 22 attached thereto and move forward by the operation of the levers (rear) 9 and 10, are movable plates 15 and lower fixing plates 14. Combined with the resin injection molding apparatus of the FRP pump, characterized in that the coupling is completed and stopped by the position detection sensor 23 attached to the left and right movable plate (20).

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