JPWO2019224927A1 - Rubber mold insert - Google Patents

Abstract

It prevents deformation and burrs of the wax mold during injection molding, improves the quality and accuracy of the wax mold, and improves the efficiency of the rubber mold attachment/detachment and the wax mold molding work. A rubber mold insert 20 for mounting the rubber mold 3 and mounting it on the clamp unit 5 of the injection molding machine, which can be fixed at spaced positions in the direction perpendicular to the clamp direction of the clamp unit 5 (X direction). A rubber-type inserter 20 having at least two fixed walls 22a and 22b and a movable wall 23 that is attached to at least one of the fixed walls 22a and 22b and is movable and positionally fixed in the vertical direction is disclosed. It

Description

  The present invention relates to a rubber mold insertion tool used when inserting or mounting a rubber mold in a clamp unit of a wax-type injection molding machine used for lost wax precision casting.

  Decorative items, accessories, jewelry, etc., which mainly use precious metals, are small, complicated, and have more precise shapes. 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 to the production of small precision industrial parts.

Lost wax precision casting in the jewelry manufacturing industry is divided into the following steps.
The first process is the prototype manufacturing process.
The second step is the manufacturing process of the rubber mold which has a cavity of the same shape as the prototype.
The third process is a mass production process of wax molds of the same shape as the original mold, in which molten wax is injected into a rubber mold and then taken out.
In the fourth step, mass-produced wax mold is attached around the wax rod in a tree-like shape while melting the end of the wax-shaped runner, mounted in a cylindrical heat-resistant container, and plaster is poured to create a plaster mold. Itinerary.
The fifth step is to use an electric furnace, a gas furnace or the like to melt off the wax inside the gypsum mold at low temperature, completely burn the wax adhering to the inside of the cavity at medium temperature, and raise the temperature further to make the gypsum mold. After producing a strength that can withstand the impact of pouring precious metal, the firing process is to lower the temperature to a temperature suitable for pouring the precious metal and wait.
The sixth step is a casting step in which precious metal is poured into a plaster mold that has many cavities that are the same as the original mold.
In the seventh step, when the precious metal has solidified, the plaster mold is rapidly water-cooled to break the plaster into pieces, the tree-shaped precious metal is taken out, the excess portion is cut off, and the precious metal of the same shape as the prototype is polished. Itinerary.

  The present invention relates to a device that plays a major role in the wax-type manufacturing process in the third step. Further, since the rubber mold for manufacturing the wax mold prepared in the second step is attached to this apparatus, it is necessary to understand its structure. Therefore, in terms of matters, the structure of the rubber mold and the function required of 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 master mold 1 shown in FIG. So that At this time, the bottom of the frame is closed with a plate in advance, and the material before vulcanization of silicone rubber is put in the lower half. After the component 2 bonded to the master 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 to vulcanize. Alternatively, there is also a method in which the two-component silicone rubber is well stirred and defoamed, and then injected into the frame to be solidified.

  When the silicone rubber hardens and has the original elasticity of the rubber, take out the rubber mold 3 from the frame, and make a notch like 3c, take out the prototype 1 and the component 2 adhered to it, and remove the rubber mold. Is separated into an upper rubber mold 3a and a lower rubber mold 3b. By making such cuts in the entire separation surface, when the upper rubber mold 3a and the lower rubber mold 3b are aligned, they can be aligned accurately, and the internal cavity shape can also be accurately reproduced.

  Such cuts 3c also facilitate vacuuming and sealing the wax under pressure when the wax is injected into the rubber mold 3 to form the wax mold. When the wax mold is taken out from the rubber mold 3, the upper rubber mold 3a is separated from the mating surface 3c, and the lower rubber mold 3b is deformed to take out the wax mold even if the wax mold has a complicated shape. It can be taken out easily. In some cases, the inside of the rubber mold may be divided into several parts or a core may be inserted.

  Since the prototype has various sizes, the rubber mold also varies in size and thickness accordingly. In addition, the hardness of the rubber is often changed according to the durability of the rubber mold and the difficulty of removing the wax mold from the inside of the rubber mold.

Various 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 vacuuming the inside of the rubber-type cavity 4 from the injection nozzle 7 and a function of pressurizing and injecting melted wax. Functions required for mass production of high-quality wax molds with high yield include temperature control of molten wax and temperature control of injection nozzle, injection pressure control, vacuuming time control, injection time control. ..

  Basically, the clamp unit 5 holds the rubber mold 3 vertically and clamps it (clamping force 5c, clamping reaction force 5d) while pressing the gate 2bb of the injection nozzle 7 (nozzle pressing force 5e) for sealing. The clamp mechanism portion 5a and the height adjusting mechanism portion 5b can be roughly classified.

  The volume and shape of the master 1 are various, and therefore, when the rubber mold manufactured from the master is viewed from above, the length and width in the vertical and horizontal directions and the thickness in the horizontal are also various. Therefore, in response to this, in order to properly inject the melted wax into the rubber mold cavity 4 and manufacture the necessary wax mold, in addition to the basic functions of FIG. Occur.

  Since the rubber mold 3 does not always have a constant thickness, and the clamp plate 8 and the rubber mold base 13 are not completely parallel, 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 the upper and lower surfaces 3a and 3b of the rubber mold by applying an average force. Since the rubber molds 3 and 3d have various sizes and thicknesses, it is necessary to move the clamping force point within a certain range 12.

  Therefore, in the clamping force generating/moving mechanism 9, when the clamping force generator 9a moves in parallel to the ejection direction of the ejection nozzle 7, the spherical bearing 10a of the floating mechanism 10 also needs to move together. 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 surfaces of the rubber molds 3 and 3d cannot be clamped. This is because the clamp plate guides 11a and 11b do not move together even if the clamp force generator 9a and the spherical bearing 10a move, and it is necessary for this function to work in all the regions where the clamp plate 8 moves up and down.

  When the thickness of the rubber molds 3 and 3d changes, the injection nozzle 7 and the sprue do not coincide with each other in the height direction. Therefore, 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 portion 5b is required.

  At the same time as moving the rubber mold 3 toward the injection nozzle 7, the sprue 2bb is pressed against the injection nozzle 7 to evacuate the cavity inside the rubber mold and to seal the pressure when the wax is injected into the rubber mold. It is necessary to have a mechanism that moves 3, 3d toward the nozzle and further generates a pressing force 5e.

  At this time, the wax injection pressure from the injection nozzle 7 is arbitrarily changed according to the shape of the rubber cavity 4 and the properties of the wax, so that the clamping force 5c and the pressing force 5e are also arbitrary so as not to lose the injection pressure. Need 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 a wax mold close to the master mold (faithful to the master mold) cannot be obtained.

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

2. Description of the Prior Art and Disadvantages As shown in the conceptual diagram of FIG. 2, when the rubber mold 3 is clamped, the rubber mold is crushed in the clamp direction and at the same time spreads in all directions in the in-plane direction perpendicular to the clamp 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 due to the design (shape/size) of the rubber mold cavity 4. In addition, when the pressure of the wax injected into the rubber mold cavity 4 (injection pressure) becomes high, the cavity 4 inside the rubber mold is also deformed, which causes a big problem depending on the design of the rubber mold cavity 4. A major problem is that, for example, burrs are generated inside, the manufactured wax mold becomes uncorrectable, and it takes a considerably long time to correct it.

  This problem is currently the biggest problem in the wax molding process of jewelery manufacturing, and is a common problem all over the world. Therefore, we carefully manage the parameters such as wax type and temperature, injection pressure, clamping pressure, vacuuming time, injection time, pressing force against the rubber type nozzle, holding time until the wax solidifies after injection, and it is barely a good product. The current situation is to manufacture a wax mold as. Depending on the design, if not strictly managed, defective products will occur immediately. That is, the range of allowable parameters is very narrow. Even with strict control, it may not be possible to produce good products.

  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 a machine to read this data immediately before mounting the rubber mold in 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 also a method in which all of those parameters are stored in the machine, and the data corresponding to the rubber mold is called and ejected each time.

  However, even in the fierce competition of design, it is difficult to mass-produce excellent wax molds in large quantities, and people concerned are worried day and night. That is, the rubber-type cavity design that can be manufactured is currently adopted, but if technological development to greatly improve this problem is made, it will not only facilitate the wax-type production of the conventional design, but also such as jewelry. It will lead to breaking the limit of design, and should greatly contribute to the development of the industry.

(1) Features of a design that tends to cause problems If the rubber mold 3 has a notch 3c that is horizontal 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 does, the shape of the cavity is deformed, but a big problem such as burrs hardly occurs.

  Generally, if the design element is thick and the pressure is low, the wax will fill the corners of the rubber mold well, but if the injection pressure is not increased as much as the delicate thin pattern, the wax will reach the corners of the rubber mold cavity. It solidifies before.

  FIG. 4A shows an example of the prototype 1 having a design in which a problem easily occurs. FIG. 4A shows a prototype 1 in which a ring is imaged, and the ring has a plurality of through holes 14. The rubber mold 3 for the prototype 1 has a cavity 4 at a portion corresponding to the body of the ring, and a rubber filling portion 15 filled with rubber at a portion corresponding to the through hole 14. 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, the cut 16 in the direction perpendicular to the cut 3c is put in the rubber filling portion 15. There is a need. Although FIG. 4B shows the case where the number of the rubber filling portions 15 is one for simplification, when the plurality of through holes 14 are provided as shown in FIG. It is necessary to make a notch 16 in the. Also, even if the through hole is not used, if the design becomes complicated, it may be necessary to make cuts at various angles in order to take out the wax mold from the rubber mold.

  The notches as described above are in close contact with each other when the rubber mold 3 receives no force. However, when the rubber mold 3 is deformed by receiving the clamping force and the injection pressure, the notch which should have been in close contact is separated and a gap is generated. When the wax is injected, the wax enters the gap and burrs are generated. When the wax mold is taken out from the rubber mold, there are cases where the hole that should have penetrated is blocked. In addition, burrs likewise occur in various cuts provided to take out a wax mold having a complicated design, impairing the original design, and the wax mold is taken out in a state where extra burrs are attached.

  If a good rubber mold can be obtained even if the injection pressure is low (in this case, the clamping force is also small), the allowable injection pressure range is narrow, but the problem is small. However, if the rubber mold becomes warm or the temperature of the wax changes and the viscosity changes, problems easily occur.

  The most difficult one is the rubber mold, which is designed with delicate and thin elements and has many through holes, as can be inferred from the above theory. Because the viscosity of the wax is quite high, it takes time for the wax to flow through the thin elements of the design. The wax will solidify over time. Therefore, the injection pressure must be fairly high in order to completely fill the wax in every corner of the design in a short time.

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

(2) Object of the present invention It is an object of the present invention to solve the above problems (1) and to easily produce a high-quality wax mold even with a complicated and delicate design. As a result, the design will be able to evolve further and will contribute to the development of this industry.

  As described in (1), the cause of burrs on the wax mold is the deformation of the rubber mold due to the clamping force and the injection pressure. Therefore, it is understood that it is only necessary to devise to minimize the deformation of the rubber mold.

  Patent Document 1 is devised as one means for solving this problem. Specifically, it has a mounting table on which a rubber mold is mounted, a clamp plate, and a clamp force generator for changing the vertical position of the clamp plate with respect to the mounting table. A wax type injection molding clamp device (clamp unit) for clamping a rubber mold between plates, further comprising a lock mechanism for fixing the vertical position of the clamp plate with respect to the mounting table. It is a clamp device. In a preferred embodiment, the lock mechanism fixes the position of the clamp plate in the vertical direction by fixing a clamp shaft for driving the clamp plate. In the invention of Patent Document 1, by fixing the clamp shaft after clamping the rubber mold, the clamp is prevented from being pushed back by the reaction force due to the injection pressure. As a result, it is possible to minimize the clamping force and reduce the deformation of the rubber mold.

  However, this alone cannot completely prevent bulging in the in-plane direction perpendicular to the clamping direction, which is caused by the injection pressure. Therefore, the present invention was devised.

The following inventions are disclosed in the present application.
<Structure 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 clamp direction of the clamp unit;
A movable wall that is attached to at least one of the fixed walls and is movable and positionally fixed in the vertical direction.
<Structure 2>
The rubber mold inserter according to the configuration 1, further comprising an eccentric cam for moving and fixing the position of the movable wall.

  An essential point of the present invention is to solve the problems described in (1) and to facilitate the attachment and detachment of the rubber mold by the inventions of Structures 1 and 2.

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

  However, the rubber mold inserts 20A and 20B do not solve the problems of (1), and facilitate the positioning of the spout 2bb of the rubber mold 3 and the position of the injection nozzle 7 to clamp the rubber mold 3. The purpose is to facilitate insertion into the rubber-type pedestal 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, but the rubber mold inserts 20A and 20B facilitate these operations. It will be.

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

  As far as the applicant is aware, the idea of solving the above problem (1) by suppressing the deformation of the rubber mold 3 in a plane perpendicular to the clamping direction has not been recognized in the art. The present invention has solved 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 mold insert 20B that can be fixed by screwing or the like after adjusting the distance between the fixed walls 22a and 22b. However, it is not easy to fix the fixing walls 22a and 22b in a state in which they are in close contact with the rubber mold 3 so that the deformation of the rubber mold 3 can be suppressed, and the detachment of the rubber mold 3 and the clamp and wax injection molding are repeated. It has been found that it is difficult to perform a series of tasks efficiently. The present application also solves the problem of the improved rubber mold insert 20B that is a means for solving the above-mentioned problem (1), and has novelty and inventive step also to the improved rubber mold insert 20B. ..

A prototype 1 and a rubber mold 3 used for wax-type 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. 1 shows a prototype 1(a) having a design in which a problem easily occurs and a rubber mold 3 corresponding to the prototype. A conventional rubber mold insert 20 is shown. 1 shows a rubber mold insert 20 according to an embodiment of the present invention. (A) is a plan view, (b) is a sectional view taken along line AA of (a), and (c) is a front view. The eccentric cam 27 is in the unlock position. The rubber mold insert 20 with the eccentric cam 27 in the locked position is shown. The rubber mold insert 20 of other embodiment is shown. (A) is a top view, (b) is an AA sectional view of (a).

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

  The rubber mold insertion tool 20 has 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 (direction X in this example) in a plane (XY plane) perpendicular to the clamp 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 a "placement place". In the present example, the front side near the center of the base 21 in the left-right direction is the mounting place, and the fixed walls 22a and 22b are fixed facing both sides thereof. You may arrange|position the fixed wall 22c behind the mounting place. The movable wall 23 is attached to the mounting location side of the fixed wall 22b (or the fixed wall 22a side).

  The fixed walls 22a to 22c and the movable wall 23 are preferably plate members that can be arranged parallel to the corresponding side surfaces of the rubber mold 3. 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 in view of ease of manufacture and strength.

  The fixed walls 22a to 22c are preferably movable in a direction perpendicular to the clamp direction. Preferably, at least one of the fixed walls 22a and 22b is movable in a direction in which the fixed walls 22a and 22b approach and separate (X direction). The fixed wall 22c is preferably movable in the Y direction. The fixed walls 22a to 22c are preferably fixable at positions close to the rubber mold 3. In this example, elongated holes 21a extending in the X direction and the Y direction are formed at appropriate positions on the base 21, and the fixed walls 22a to 22c can be freely moved along the elongated holes 21a so that they can be fixed with fixing screws 22f. Is becoming

  The movable wall 23 is preferably movable in the direction perpendicular to the clamp direction (X direction) and positionally fixable. In particular, it is preferable to be movable and positionally fixed 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 rod 24, and the movable wall 23 is moved by sliding the guide rod 24 in the guide hole 25 formed in the fixed wall 22b.

  The movable wall 23 is always pulled in the direction in which it is in close contact with the fixed wall 22b by, for example, a spring 26 arranged in the guide hole 25. An eccentric cam 27 that can rotate (for example, rotate 90 degrees) around a cam shaft 28 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 movable wall 23 can be fixed in position after the movement so that the movable wall 23 does not move due to the reaction force of the rubber mold 3 without using a separate fixing means.

  In the illustrated example, the fixed wall 22b is configured by a main body 31 having a concave portion and a lid body 33 that is fixed to the main body 31 with a screw by leaving a gap 32 between the concave portion and the eccentric cam 27. By allowing the eccentric cam 27 to rotate in the space, a simple and inexpensive structure in which the urging force of the eccentric cam 27 acts on the movable wall 23 near the center in the height direction (Z direction) is realized.

  In the rubber mold insert 20, the fixed walls 22a and 22b correspond to "at least two fixed walls" of the configuration 1, the movable wall 23 corresponds to the "movable wall" of 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 movable wall 23 in position. The movable wall fixing mechanism is constituted, the long holes 21a and the like constitute a fixed wall moving mechanism which moves the fixing walls 22a and 22b in a direction perpendicular to the clamping direction, and the fixing screws 22f and the like fix the fixing walls 22a and 22b. The second fixed wall fixing mechanism is configured.

  A method of using the rubber mold insertion tool 20 will be described. The fixing walls 22a and 22c are arranged along the side surface of the rubber mold 3 when the rubber mold 3 is placed on the base 21 and fixed by the fixing screw 22f. The eccentric cam 27 is set to the lock position in FIG. 7, the rubber mold 3 is placed on the base 21, the rubber mold 3 is brought into close contact between the fixed wall 22a and the movable wall 23, and the fixed wall 22b is fixed with the fixing screw 22f. The rubber mold insertion tool 20 is inserted into the wax injection molding machine 6 to execute wax injection.

  Other uses are possible. For example, the eccentric cam 27 is set at an intermediate position between FIG. 6 and FIG. 7, the fixing walls 22a and 22b are fixed so as to make sufficient contact with the rubber mold 3, and then the eccentric cam 27 is rotated to the lock position of FIG. By doing so, 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 unlock position in FIG. 6, a gap is created between the rubber mold 3 and the movable wall 23 as described above. Since it occurs, the rubber mold 3 can be easily attached and detached. In this case, a mechanism (for example, ratchet mechanism) for temporarily stopping the eccentric cam 27 at the intermediate position between FIGS. 6 and 7 may be provided.

  The eccentric cam 27 is set to the unlock position, the fixing walls 22a and 22b are fixed with a gap so that the rubber mold 3 can be easily attached and detached, and then the eccentric cam 27 is rotated to the lock position to preload the rubber mold 3. You can hang it. 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 in order to provide an appropriate gap.

  When the rubber mold insert 20 is used, when the rubber mold 3 is clamped, it is possible to suppress deformation of the rubber mold 3 in an in-plane direction (especially the left-right direction X) perpendicular to the clamping direction. Therefore, a wax mold faithful to the master mold 1 can be created and/or burrs around the cuts 16 can be prevented. When the rubber mold 3 is replaced, if the eccentric cam 27 is set to the unlock 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 attached and detached.

  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 repeatedly attaching and detaching the rubber mold 3, clamping the rubber mold 3 and wax injection molding is significantly improved. Since the spring 26 and the eccentric cam 27 are used, 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, so when the rubber mold 3 is clamped, The deformation of the rubber mold 3 can be reduced.

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

  However, even if the movable walls 23 are provided on the fixed walls 22a and 22b on both the left and right sides, the function is not particularly improved as compared with the case where the movable wall 23 is provided on only one side, and there is not much benefit. Further, the necessity of providing the movable wall 23 on the rear fixed wall 22c is not high. This is because 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 has been sufficiently pressed against the rear fixed wall 22c. Moreover, since the wax is injected while the spout 2bb is 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 wax injection pressure is applied.

  When the movable wall 23 is provided on the rear fixed wall 22c, it is preferable to provide the fixed walls 22d and 22e in front of the placement location, preferably on both sides of the spout 2bb, 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 even if the cam shaft is in another direction (for example, the Y direction), the movable wall 23 is the same as in the above embodiment. Eccentric cams that move in the direction 29 of are possible. Instead of the eccentric cam, the movable wall 23 may be moved and fixed by a screw or other mechanism. Mechanisms other than the above, as long as the movable wall 23 can move in a direction approaching and separating from the rubber mold 3 and can be firmly fixed so as not to move even when receiving the reaction force of the rubber mold 3 during clamping. But it's okay.

  Due to the competition between companies and the constant demands of buyers, the design of jewelry products is constantly evolving. According to the present invention, it is possible to manufacture a wax mold that is more faithful to the master mold, and/or to manufacture a wax mold that faithfully reproduces even a master mold having a more complicated, fine, or intricate shape. Therefore, a significant breakthrough may be achieved by solving the problems of the present invention or by using the present invention and the clamp unit of Patent Document 1 together.

DESCRIPTION OF SYMBOLS 1... Prototype 2... Parts 2a... Runner 2bb... Spout 3,3d... Rubber mold 3c... Rubber mold mating surface 4... Rubber mold cavity 5... Clamp unit 5a... Clamping mechanism 5b... Adjusting mechanism 5c... Clamping force 5d... Clamping 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 die receiving base 14...Through hole 15...Rubber filling Part 16... Notches 20, 20A, 20B... Rubber type insert 21... Base 21a... Slots 22a-22e... Fixed wall 22f... Fixed screw 23... Movable wall 24... Guide rod 25... Guide hole 26... Spring 27... Eccentric cam 28... Cam shaft 31... Main body 32... Gap 33... Lid

Claims (2)

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 clamp direction of the clamp unit;
A movable wall that is attached to at least one of the fixed walls and is movable and positionally fixed in the vertical direction.   The rubber mold inserter according to claim 1, further comprising an eccentric cam for moving and fixing the position of the movable wall.

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