JP6455647B1 - Rubber mold insert - Google Patents

Abstract

It prevents deformation of the wax mold and occurrence of burrs during injection molding, improves the quality and precision of the wax mold, and improves the efficiency of attaching / detaching the rubber mold and molding the wax mold. A rubber mold insertion tool 20 for mounting a rubber mold 3 and mounting it on a clamp unit 5 of an injection molding machine, which can be fixed at a position separated in a direction (X direction) perpendicular to the clamp direction of the clamp unit 5 There is disclosed a rubber-type inserter 20 having at least two fixed walls 22a and 22b and a movable wall 23 attached to at least one of the fixed walls 22a and 22b and capable of moving and fixing in the vertical direction. The

Description

  The present invention relates to a rubber mold insertion tool used when a rubber mold is inserted into or attached to a clamp unit of a wax mold injection molding machine used for lost wax precision casting.

  Decorations, accessories, jewelry, etc., mainly using precious metals, are small, complex, and more precise. There is a desire to produce such products in large quantities, and lost wax precision casting has been developed in the industry. Of course, it can also be applied in the manufacture of small precision industrial parts.

The lost wax precision casting method in the jewelry manufacturing industry is classified into the following processes.
The first process is a prototype production process.
The second process is a process of making a rubber mold with a cavity of the same shape as the original mold.
The third process is a mass production process of a wax mold having the same shape as the original mold, in which the melted wax is injected into the rubber mold and is repeatedly taken out.
In the fourth step, the mass-produced wax mold is attached in a tree shape while melting the end of the wax mold around the wax rod, and this is installed in a cylindrical heat-resistant container, and gypsum is poured to create a gypsum mold. Journey.
In the fifth step, using an electric furnace or gas furnace, the wax inside the gypsum mold is melted away at a low temperature, the wax adhering to the inside of the cavity is completely burned at a medium temperature, and the temperature is further raised to increase the temperature. A firing process in which after the steel has developed a strength that can withstand the impact of pouring a precious metal, it is lowered to a temperature suitable for pouring the precious metal.
The sixth process is a casting process in which precious metal is poured into a gypsum mold with many of the same cavities as the original mold.
In the seventh process, when the precious metal is hardened, the plaster mold is rapidly cooled with water, and the plaster is divided into pieces, the tree-like precious metal is taken out, the excess part is cut off, and the precious metal with the same shape as the original is polished. Journey.

  The present invention relates to an apparatus that plays a leading role in the wax mold manufacturing process in the third step. In addition, it is necessary to understand the structure of the rubber mold for manufacturing the wax mold created in the second process in order to mount the apparatus on the apparatus. Therefore, in the matter, the structure of the rubber mold and the function required for the wax injection molding machine will be described in detail.

Rubber mold manufacturing method and its structure The runner 2a and the sprue 2b are bonded to the original mold 1 shown in FIG. 1, and the sprue is in close contact with the side of the frame in the frame having the outer diameter of the rubber mold 3 to be manufactured. Put in as follows. At this time, the bottom of the frame is closed with a plate beforehand, and the material before vulcanization of silicon rubber is put in the lower half. After the component 2 bonded to the original mold 1 is put in the frame, the material before vulcanization is put in the upper half, the upper part of the frame is closed with a plate, and the temperature is raised while pressing and vulcanized. Alternatively, there is a method in which two-part silicone rubber is thoroughly stirred and defoamed and then injected into the frame and solidified.

  When the silicon rubber is hardened and has the inherent elasticity of the rubber, the rubber mold 3 is taken out of the frame and further cut as in 3c to take out the original mold 1 and the part 2 adhered to the rubber mold 3. Is separated into an upper rubber mold 3a and a lower rubber mold 3b. By making such a cut into the entire separation surface, when the upper rubber mold 3a and the lower rubber mold 3b are combined, it is possible to accurately match, and the internal cavity shape can also be accurately reproduced.

  Such a notch 3c also makes it easy to seal the evacuated and pressurized wax when injecting wax into the rubber mold 3 to create a wax mold. When taking out the wax mold from the rubber mold 3, after separating the upper rubber mold 3a from the mating surface 3c and taking out the work while deforming the lower rubber mold 3b, even if the wax mold has a complicated shape, it will not break. It can be easily taken out. In some cases, the inside of the rubber mold may be divided into several parts or cores may be inserted.

  Since the original mold has various sizes, the size and thickness of the rubber mold change in accordance with the size. Also, the hardness of the rubber is often changed in accordance with the durability of the rubber mold and the difficulty level when the wax mold is taken out from the rubber mold.

Functions Required for Wax Type Injection Molding Machine and Clamp Unit FIGS. 2 and 3 are conceptual diagrams of the wax type injection molding machine and the clamp unit.

  The wax type injection molding machine 6 has an injection nozzle 7, and basically has a function of evacuating the inside of the rubber mold cavity 4 from the injection nozzle 7 and a function of pressurizing and injecting molten wax. Furthermore, functions required for mass production of high-quality wax molds with high yield include temperature control of dissolved wax, temperature control of injection nozzle, control of injection pressure, control of evacuation time, control of injection time, etc. .

  The clamp unit 5 basically holds the rubber mold 3 up and down and presses the spout 2bb against the injection nozzle 7 (nozzle pressing force 5e) for sealing while holding the clamp (clamping force 5c, clamping reaction force 5d). It can be roughly divided into a clamp mechanism 5a and a height adjustment mechanism 5b.

  The volume and shape of the original mold 1 are various. Therefore, when the rubber mold manufactured from the original mold is viewed from above, the length in the vertical and horizontal directions and the thickness viewed from the lateral are also various. Accordingly, in order to properly inject the melted wax into the rubber mold cavity 4 and manufacture the necessary wax mold, there are further necessary functions in addition to the basic functions shown in FIG. Occur.

  The thickness of the rubber mold 3 is not always constant, and the clamp plate 8 and the rubber mold cradle 13 are not completely parallel. Therefore, the clamp force generator 9a and the clamp plate 8 have a floating mechanism having a spherical bearing 10a. It is common to bond at 10.

  In order to clamp and properly seal the rubber mold 3, it is necessary to apply a uniform surface pressure to the rubber mold mating surface 3c. Therefore, it is desirable to clamp by applying an average force to the upper and lower surfaces 3a and 3b of the rubber mold. Since the rubber molds 3 and 3 d have various sizes and thicknesses, it is necessary to move the clamping force point within a certain range 12.

  For this reason, when the clamping force generator 9a moves parallel to the injection direction of the injection nozzle 7 in the clamping force generation and movement mechanism 9, the spherical bearing 10a of the floating mechanism 10 also needs to move in conjunction with it. At this time, if the clamp plate 8 also moves together, the clamp plate 8 interferes with the injection nozzle 7 or the entire upper surface of the rubber molds 3 and 3d cannot be clamped. This is because the clamp plate guides 11a and 11b are not moved together even when the clamp force generator 9a and the spherical bearing 10a are moved, and this function needs to work in the entire region where the clamp plate 8 is raised and lowered.

  If the thickness of the rubber molds 3 and 3d changes, the injection nozzle 7 and the gate will not match in the height direction, so the height of the rubber mold cradle 13 is arbitrarily changed within a certain range 3e according to the rubber molds 3 and 3d. Therefore, the height adjusting mechanism 5b is necessary.

  At the same time as moving the rubber mold 3 in the direction of the injection nozzle 7, the rubber mold 2 is pressed against the injection nozzle 7 to vacuum the cavity inside the rubber mold and seal the pressure when the wax is injected into the rubber mold. A mechanism for moving 3, 3d in the nozzle direction and generating a pressing force 5e is required.

  At this time, in order to arbitrarily change the wax injection pressure from the injection nozzle 7 in accordance with the shape of the rubber mold cavity 4 and the properties of the wax, the clamping force 5c and the pressing force 5e are also optional so as not to lose the injection pressure. It is necessary to change to. However, if the clamping force 5c and the pressing force 5e are applied more than necessary, the rubber mold 3 is deformed, so that it is impossible to obtain a wax mold that is close to the original mold (faithful to the original mold).

International Publication No. 2017/029699 Pamphlet JP 2002-254137 A

2. Prior Art and Defects As shown in the conceptual diagram of FIG. 2, when the rubber mold 3 is clamped, the rubber mold collapses in the clamping direction and simultaneously spreads in all directions in an in-plane direction perpendicular to the clamping direction. At this time, since the cavity 4 inside the rubber mold is deformed, when wax is injected into the rubber mold, a big problem occurs depending on the design (shape / size) of the rubber mold cavity 4. Further, when the pressure (injection pressure) of the wax injected into the rubber mold cavity 4 is increased, the cavity 4 inside the rubber mold is also deformed, which causes a serious problem depending on the design of the rubber mold cavity 4. Major problems include, for example, the occurrence of burrs in the interior, making the manufactured wax mold uncorrectable, and taking a significant amount of correction time.

  This problem is currently the biggest problem in the wax mold making process of jewelry production, and is a common problem all over the world. Therefore, finely control the parameters such as wax type and temperature, injection pressure, clamping pressure, evacuation time, injection time, pressing force against the rubber type nozzle, holding time until the wax solidifies, and barely good products Currently, the wax mold is manufactured. Depending on the design, if not strictly managed, defective products will be generated immediately. That is, the allowable parameter range is very narrow. Even if strictly controlled, good products may not be produced.

  Since the parameters corresponding to each rubber mold are different, this data is written in the IC tag and embedded in the rubber mold. There is a method of causing the machine to read this data immediately before mounting the rubber mold on the wax mold injection molding machine 6 and injecting the wax into the rubber mold cavity (for example, Patent Document 2). In addition, there is a method in which all the parameters are stored in the machine, and the data corresponding to the rubber mold is called and injected each time.

  However, in spite of the intense design competition, it is difficult to produce high-quality wax molds in large quantities, and the people concerned are worried day and night. In other words, a rubber mold cavity design that can be manufactured is currently adopted, but if there is technological development to greatly improve this problem, not only wax mold production of the conventional design will be facilitated, but also jewelry etc. It will lead to breakthrough in design and should contribute greatly to the development of the industry.

(1) Feature of design that is likely to cause problems In the rubber mold 3 that has a notch 3c horizontally with respect to the clamping direction, the injection pressure increases if the rubber mold is clamped with a clamping force corresponding to the injection pressure. Even if it is, the cavity shape is deformed, but there are hardly any major problems such as burrs.

  In general, if the design elements are thick, the wax will fill the corners of the rubber cavity sufficiently even at low pressure. However, if the injection pressure is not increased as the delicate thin pattern, the wax will reach the corners of the rubber cavity. It hardens before.

  FIG. 4A shows an example of a prototype 1 having a design in which problems are likely to occur. FIG. 4A shows a prototype 1 in the image of a ring, and the ring has a plurality of through holes 14. In the rubber mold 3 for the prototype 1, a portion corresponding to the ring body is a cavity 4, and a portion corresponding to the through hole 14 is a rubber filling portion 15 filled with rubber. Therefore, the wax mold cannot be taken out from the rubber mold when the wax mold is manufactured unless the rubber filling portion 15 is cut and cut. Therefore, in the case of the ring of FIG. 4 (a), as shown in FIG. 4 (b), in order to separate the rubber mold 3, a notch 16 perpendicular to the notch 3c is put in the rubber filling portion 15. There is a need. 4B shows the case where there is one rubber filling portion 15 for simplification, but when there are a plurality of through holes 14 as shown in FIG. 4A, all the rubber filling portions 15 are provided. It is necessary to make a notch 16 in. Even if it is not a through hole, if the design becomes complicated, it may be necessary to make cuts at various angles in order to remove the wax mold from the rubber mold.

  The cuts as described above are in close contact when the rubber mold 3 is not receiving any force. However, when the rubber mold 3 is deformed by receiving the clamping force and the injection pressure, the notch that should have been in close contact is separated and a gap is generated. When the wax is injected, the wax enters the gap and generates burrs. When the wax mold is taken out from the rubber mold, the hole that should have penetrated may be blocked. In addition, burrs are similarly generated at various notches provided for taking out the wax mold having a complicated design, and the original design is damaged, and the wax mold is taken out with extra burrs attached.

  If a good rubber mold can be obtained even if the injection pressure is low (in this case, the clamping force can be small), there are few problems even if the allowable injection pressure range is narrow. However, problems tend to occur when the rubber mold warms up or the viscosity of the wax changes as the temperature of the wax changes.

  The most difficult is a rubber mold with a design that has delicate and thin elements and many through-holes, as can be inferred from the theory described above. This is because the viscosity of the wax is so high that it takes time for the wax to flow through the narrow elements of the design. The wax will harden over time. Therefore, in order to fully fill the wax in every corner of the design in a short time, the injection pressure must be quite high.

  When the injection pressure is increased, the clamp pressure must be increased. Then, the rubber mold is deformed and burrs are generated. Since this is a theoretical contradiction, it cannot be solved by conventional techniques.

(2) Object of the present invention The object of the present invention is to solve the above problems (1) and enable easy production of a high-quality wax mold even with a complicated and delicate design. As a result, design can evolve further and contribute to the development of this industry.

  As described in (1), the cause of burr in the wax mold is the deformation of the rubber mold due to the clamping force and the injection pressure. Therefore, it can be seen that it suffices to devise ways to minimize the deformation of the rubber mold.

  Patent Document 1 was devised as one means for solving this problem. Specifically, the mounting table for mounting the rubber mold, a clamp plate, and a clamp force generator for changing the vertical position of the clamp plate with respect to the mounting table, the mounting table and the clamp A clamping device (clamp unit) for wax mold injection molding that clamps a rubber mold between plates, further comprising a lock mechanism for fixing a vertical position of the clamp plate with respect to the mounting table. It is a clamping device. In a preferred embodiment, the locking mechanism fixes a vertical position of the clamp plate by fixing a clamp shaft for driving the clamp plate. In the invention of Patent Document 1, the clamp shaft is fixed after the rubber mold is clamped to prevent the clamp from being pushed back by the reaction force due to the injection pressure. As a result, the clamping force can be minimized and the deformation of the rubber mold can be reduced.

  However, this alone cannot completely prevent the bulge in the in-plane direction perpendicular to the clamping direction caused by the injection pressure. For this reason, the present invention has been devised.

The present invention discloses the following invention.
<Configuration 1>
A rubber mold insertion tool for mounting a rubber mold and mounting it on a clamp unit of an injection molding machine,
At least two fixing walls that can be fixed at spaced positions in a direction perpendicular to the clamping direction of the clamp unit;
A rubber-type insertion tool comprising: a movable wall attached to at least one of the fixed walls and capable of moving and fixing a position in the vertical direction.
<Configuration 2>
The rubber-type inserter according to Configuration 1, further comprising an eccentric cam for moving and fixing the position of the movable wall.

  The gist of the present invention is to solve the problems described in (1) by the inventions of configurations 1 and 2, and to make it easy to attach and detach the rubber mold.

  In FIG. 3, when the rubber mold 3 is attached to the clamp unit 5 (rubber mold cradle 13), a rubber mold insertion tool 20A as shown in FIG. 5A may be used. The rubber mold insertion tool 20 </ b> A has a base 21 made of an acrylic plate or the like, and is attached to the clamp unit 5 with the rubber mold 3 placed on the front side of the center 21 in the left-right direction center. As with the rubber mold insertion tool 20B of FIG. 5B, positioning fixing walls 22a to 22c may be provided on the left and right or the rear side of the place where the rubber mold 3 is placed.

  However, the rubber mold insertion tools 20A and 20B do not solve the problems of (1). The rubber mold insertion tools 20A and 20B facilitate positioning to match the positions of the gate 2bb of the rubber mold 3 and the injection nozzle 7, and clamp the rubber mold 3. The purpose is to facilitate insertion into the rubber-type cradle 13 of the unit 5. Since the space between the rubber mold cradle 13 and the clamp plate 8 is narrow, it is difficult for the hand to enter and it is difficult to confirm the position of the rubber mold 3. However, these operations can be easily performed by using the rubber mold insertion tools 20A and 20B. It becomes.

  Here, the rubber mold insertion tool 20B has the fixing walls 22a to 22c, but has no effect of suppressing deformation of the rubber mold 3 in a plane perpendicular to the clamping direction, and does not solve the problems (1). . This is because it is necessary to leave a certain gap between the rubber mold 3 and the fixed walls 22a to 22c in order to facilitate the removal and attachment of the rubber mold 3. In order to suppress the deformation of the rubber mold 3 in a plane perpendicular to the clamping direction, the rubber mold 3 and the fixing walls 22a to 22c need to be in close contact with each other. Soon, it becomes difficult to attach and detach, and workability is significantly reduced.

  As far as the applicant knows, the idea of solving the above problem (1) by suppressing deformation of the rubber mold 3 in a plane perpendicular to the clamping direction has not been recognized in the art. The present invention solves the problems newly found by the applicant and has novelty and inventive step over the prior art.

  In the course of reaching the present invention, the applicant has devised an improved rubber insertion tool 20B that can be fixed with screws or the like after adjusting the interval between the fixing walls 22a and 22b. However, it is not easy to fix the fixing walls 22a and 22b so that the rubber mold 3 can be prevented from being deformed, and the rubber mold 3 is repeatedly detached and clamped and the wax is injection-molded. It has been found that it is difficult to perform a series of operations efficiently. The present application also solves the problem of the improved rubber-type insert 20B, which is a means for solving the problem (1), and has novelty and inventive step over the improved rubber-type insert 20B. .

An original mold 1 and a rubber mold 3 used for wax mold injection molding are shown. The conceptual diagram of a wax type injection molding machine is shown. The conceptual diagram of the clamp unit 5 is shown. A prototype 1 (a) and a rubber mold 3 corresponding to the design are likely to cause problems. A conventional rubber insert 20 is shown. The rubber type insertion tool 20 of one Embodiment of this invention is shown. (A) is a top view, (b) is AA sectional drawing of (a), (c) is a front view. The eccentric cam 27 is in the unlock position. The rubber-type insertion tool 20 with the eccentric cam 27 in the locked position is shown. The rubber type insertion tool 20 of other embodiment is shown. (A) is a top view, (b) is AA sectional drawing of (a).

  FIG. 6 shows a rubber insert 20 according to one embodiment of the present invention.

  The rubber-type insertion tool 20 includes a base 21, fixed walls 22 a to 22 c, and a movable wall 23.

  The fixed walls 22a and 22b can be fixed at positions separated in one direction (in this example, the direction X) in a plane (XY plane) perpendicular to the clamping direction. The rubber mold 3 is placed between the fixed walls 22a and 22b. Hereinafter, the place where the rubber mold 3 is arranged on the base 21 is referred to as “placement place”. In this example, the front side of the base 21 near the center in the left-right direction is a mounting place, and the fixed walls 22a and 22b are fixed facing both sides. The fixed wall 22c may be disposed behind the placement place. The movable wall 23 is attached to the placement place side (or the fixed wall 22a side) of the fixed wall 22b.

  The fixed walls 22 a to 22 c and the movable wall 23 are preferably plate members that can be arranged in parallel to the corresponding side surfaces of the rubber mold 3. From the standpoint of ease of manufacture and strength, the base 21 may be formed of an aluminum plate or the like, the fixed walls 22a to 22c may be formed of an aluminum plate or the like, and the movable wall 23 may be formed of a stainless plate or the like.

  The fixed walls 22a to 22c are preferably movable in a direction perpendicular to the clamping direction. Preferably, at least one of the fixed walls 22a and 22b may be movable in a direction (X direction) in which both are approaching and separating. The fixed wall 22c is preferably movable in the Y direction. The fixing walls 22 a to 22 c are preferably fixed at positions close to the rubber mold 3. In this example, a long hole 21a extending in the X direction and the Y direction is formed at an appropriate position of the base 21, so that the fixing walls 22a to 22c can be freely moved along the long hole 21a and fixed with the fixing screw 22f. It has become.

  The movable wall 23 is preferably movable in a direction perpendicular to the clamping direction (X direction) and can be fixed in position. In particular, it is preferable to be movable and position-fixable with respect to the fixed wall 22b in a direction approaching and separating from the fixed wall 22a. The movable wall 23 of this example has a guide bar 24, and the movable wall 23 moves by sliding the guide bar 24 in a guide hole 25 formed in the fixed wall 22b.

  The movable wall 23 is always pulled in a direction in close contact with the fixed wall 22b by, for example, a spring 26 disposed in the guide hole 25. An eccentric cam 27 that can rotate around the cam shaft 28 (for example, 90 degrees) is attached to the fixed wall 22b. By rotating the eccentric cam 27 from the unlock position in FIG. 6 to the lock position in FIG. 7, the movable wall 23 can be moved to the fixed wall 22a side (arrow 29). If the amount of eccentricity of the eccentric cam 27 is set appropriately, the position of the movable wall 23 can be fixed so as not to move by the reaction force of the rubber mold 3 at the position after the movement without using a separate fixing means.

  In the illustrated example, a fixing wall 22b is configured by a body 31 having a recess and a lid 33 that is secured to the body 31 with a gap 32 between the recess and the eccentric cam 27 in the gap 32. By enabling the rotation in the space, a simple and inexpensive structure in which the urging force of the eccentric cam 27 is applied to the movable wall 23 near the center in the height direction (Z direction) is realized.

  In the rubber-type insertion tool 20, the fixed walls 22 a and 22 b correspond to “at least two fixed walls” in the configuration 1, the movable wall 23 corresponds to the “movable wall” in the configuration 1, the guide rod 24, the guide The hole 25, the spring 26, the eccentric cam 27, and the like constitute a movable wall moving mechanism that moves the movable wall 23 in a direction perpendicular to the clamping direction, and the fixed wall 22b, the eccentric cam 27, and the like fix the position of the movable wall 23. The movable wall fixing mechanism is configured, the long holes 21a and the like configure a fixed wall moving mechanism that moves the fixed walls 22a and 22b in a direction perpendicular to the clamping direction, and the fixing screws 22f and the like fix the fixed walls 22a and 22b. The second fixed wall fixing mechanism is configured.

  The usage method of the rubber-type insertion tool 20 is demonstrated. The fixing walls 22a and 22c are arranged along the side surface of the rubber mold 3 when the rubber mold 3 is mounted on the mounting place of the base 21, and fixed with fixing screws 22f. The rubber mold 3 is placed on the base 21 with the eccentric cam 27 in the locked position of FIG. 7, the rubber mold 3 is brought into close contact with the fixed wall 22a and the movable wall 23, and the fixed wall 22b is fixed with a fixing screw 22f. The rubber mold insertion tool 20 is inserted into the wax mold injection molding machine 6 to perform wax injection.

  Other uses are possible. For example, the eccentric cam 27 is set at an intermediate position between FIGS. 6 and 7, the fixing walls 22 a and 22 b are fixed so as to be in sufficient contact with the rubber mold 3, and then the eccentric cam 27 is rotated to the locked position shown in FIG. 7. Then, a sufficient preload can be applied to the rubber mold 3 from the movable wall 23, and if the eccentric cam 27 is returned to the unlocked position in FIG. 6, a gap is formed between the rubber mold 3 and the movable wall 23 as described above. Since this occurs, the rubber mold 3 can be easily detached. In this case, a mechanism (for example, a ratchet mechanism) that temporarily stops the eccentric cam 27 at an intermediate position between FIGS. 6 and 7 may be provided.

  The eccentric cam 27 is set to the unlocked position, a clearance is provided so that the rubber mold 3 can be easily attached and detached, the fixing walls 22a and 22b are fixed, and then the eccentric cam 27 is rotated to the locked position to preload the rubber mold 3. You may hang it. In order to make an appropriate gap, the fixed walls 22a and 22b may be fixed with paper or a thin plate sandwiched between the rubber mold 3 and the fixed wall 22a or the movable wall 23.

  If the rubber mold insertion tool 20 is used, when the rubber mold 3 is clamped, deformation of the rubber mold 3 in the in-plane direction (particularly the left-right direction X) perpendicular to the clamping direction can be suppressed. Therefore, a wax mold faithful to the prototype 1 can be created and / or burrs around the cut 16 can be prevented. When the rubber mold 3 is replaced, if the eccentric cam 27 is set to the unlocked position in FIG. 6, the movable wall 23 moves to the fixed wall 22a side, and a gap is generated between the rubber mold 3 and the movable wall 23. The rubber mold 3 can be removed.

  Since the rubber mold 3 can be locked and unlocked by the movement of the movable wall 23, the efficiency of a series of operations of repeating the removal and attachment of the rubber mold 3, the clamping of the rubber mold 3, and the wax injection molding is remarkably improved. Since the spring 26 and the eccentric cam 27 are used, switching between locking and unlocking can be performed with one hand.

  Since the rubber mold 3 is sufficiently pressed against the rear fixed wall 22c and then the rubber mold 3 is sandwiched between the fixed wall 22a and the movable wall 23, a frictional force acts. Therefore, when the rubber mold 3 is clamped, The deformation of the rubber mold 3 can also be reduced.

  In the above embodiment, the movable wall 23 is provided only on the fixed wall 22b. However, the movable wall 23 may be provided on any one or two or all of the fixed walls 22a to 22c. .

  However, even if the movable walls 23 are provided on the left and right fixed walls 22a and 22b, the special function is not improved as compared with the case where the movable wall 23 is provided only on one side, and there is not much profit. Further, the necessity of providing the movable wall 23 on the rear fixed wall 22c is not high. This is because the deformation of the rubber mold 3 in the front-rear direction Y can be suppressed by the frictional force generated by sandwiching the rubber mold 3 between the fixed wall 22a and the movable wall 23 after the rubber mold 3 is sufficiently pressed against the rear fixed wall 22c. In addition, since the wax is injected with the gate 2bb pressed against the injection nozzle 7, the rubber mold 3 receives a force so as to be sandwiched between the fixed wall 22c and the injection nozzle 7, so that the rubber mold is clamped up and down. This is because the deformation of the rubber mold 3 in the front-rear direction Y can be suppressed both when the pressure is applied and when the injection pressure of the wax is applied.

  When the movable wall 23 is provided on the rear fixed wall 22c, the fixed walls 22d and 22e are preferably provided on both sides of the gate 2bb in front of the placement place as shown in FIG.

  In the above embodiment, the cam shaft 28 of the eccentric cam 27 in FIGS. 6 and 7 is in the Z direction, but the movable wall 23 is the same as in the above embodiment even if the cam shaft is in another direction (for example, the Y direction). An eccentric cam that moves in the direction 29 is possible. Instead of the eccentric cam, the movable wall 23 may be moved and fixed by a screw or other mechanism. Any mechanism other than the above as long as the movable wall 23 can move in the direction approaching and separating from the rubber mold 3 and can be firmly fixed so that it does not move even when subjected to the reaction force of the rubber mold 3 during clamping. But you can.

  As competition between companies and the demands of buyers always work, the vector that the design of jewelry products always wants to evolve is working. According to the present invention, it is possible to manufacture a wax mold that is more faithful to the prototype, and / or it is possible to manufacture a wax mold that faithfully reproduces a prototype of a more complicated, fine, or complicated shape. Therefore, a significant breakthrough may be achieved by solving the various problems according to the present invention or by using the present invention and the clamp unit of Patent Document 1 in combination.

DESCRIPTION OF SYMBOLS 1 ... Prototype 2 ... Parts 2a ... Runway 2bb ... Spout 3, 3d ... Rubber mold 3c ... Rubber mold mating surface 4 ... Rubber mold cavity 5 ... Clamp unit 5a ... Clamp mechanism 5b ... Adjustment mechanism 5c ... Clamping force 5d ... Clamp reaction force 6 ... Wax type injection molding machine 7 ... Injection nozzle 8 ... Clamp plate 9 .... Clamping force generating / moving mechanism 9a ... Clamping force generator 10 ... Floating mechanisms 11a, 11b ... Clamp plate guide 13 ... Rubber mold base 14 ... Through hole 15 ... Filling with rubber Part 16: Notches 20, 20A, 20B ... Rubber insert 21 ... Base 21a ... Slots 22a-22e ... Fixed wall 22f ... Fixed screw 23 ... Movable wall 24 ... guide rod 25 ... guide hole 2 ... spring 27 ... eccentric cam 28 ... cam shaft 31 ... main body 32 ... gap 33 ... lid

Claims (2)

A rubber mold insertion tool for mounting the rubber mold on a clamp unit of an injection molding machine that clamps and clamps the rubber mold from a predetermined direction ,
A mounting place for mounting the rubber mold;
Two fixed walls that can be fixed at positions on both sides of the installation place in a direction perpendicular to the predetermined direction ;
A movable wall attached to at least one of the fixed walls;
It said movable wall is rubber-type insertion tool and having said from one of said fixed wall is movable and stationary in a direction toward and away from the other of the fixed wall. An eccentric cam rotatable around a predetermined axis;
The rubber-type inserter according to claim 1 , wherein the movable wall can be moved by rotating the eccentric cam , and the position of the movable wall can be fixed.

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