KR20180009283A - Wax Injection Machine Provided With A Turn Table - Google Patents

Abstract

The present invention relates to a wax injection device (1) having a rotary table, which comprises: a frame part (2) for forming a support body; a wax mixing part (3) for accommodating wax to be used for injection, and melting and mixing the same; a wax injection part (5) for injecting the molten wax of the wax mixing part (3) into a mold (M) for the model molding; a mold loading part (6) for placing the mold (M) at a position adjacent to a nozzle tip (47) of the wax injection part (5); and a model extraction unit (7) for extracting a wax model which is completely molded, from the mold (M) opened by the mold loading part (6) to move the same. The mold loading unit (6) includes a table (61) for loading to support the mold (M) in an injectable state; and a pressing plate (62) installed to face an upper side of the table (61) to downwardly press the mold (M) loaded on the table (610). The table (61) can be rotated to allow the mold (M) to be changed to an extraction position where the wax model can be extracted, from an injection position where the wax is injectable or vice versa. Accordingly, two molds disposed on the table can be separately positioned at an injection position or an extraction position in accordance with the rotation of the table, so the wax model can be automatically extracted from the mold at the extraction position, and thus, efficiency and productivity of an injection operation can be significantly improved through an automation of a process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wax injection machine having a rotatable table,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wax extruder having a rotary table, and more particularly, to a wax extruder having a rotatable table, The present invention relates to a wax extruder having a rotary table in which a table is modified.

Generally, there are casting methods such as roast wax method, carbon dioxide method, show casting method, and cell molding method which require high dimensional precision. Of these, the roast wax method is a method in which a model is first made using wax, A casting method of casting a precise shaped product using a ceramic bark remaining as a mold by coating and solidifying a wax model by heating at a high temperature, the wax extruder as shown in FIG. 1 -0099207).

The wax injector includes a wax cylinder 101 for injecting the wax into the mold 190 in a reaction state as shown by reference numeral 110 in Fig. 1, a support frame 140 for supporting the wax cylinder 101, A hydraulic cylinder 150 mounted on the support frame 140 so as to be coaxially disposed behind the wax cylinder 101 and a hydraulic cylinder 150 disposed in front of the wax cylinder 101 and adapted to press and fix the mold 190 A transverse moving part 170 which is attached to the bottom surface of the supporting frame 140 and moves the wax cylinder 101 back and forth through the supporting frame 140 so that the transverse moving part 170 can be lifted up and down And a base frame 120 on which the elevating part 180 is supported.

Therefore, in order to produce the wax model by the wax injector 110, the wax cylinder 101 is first filled with the solidified wax, and the hydraulic cylinder 150 is operated so that the plunger at the tip of the hydraulic cylinder 150 And the inlet of the wax cylinder 101 is closed by the wax cylinder 151. Then, the band heater 107 wound around the outer wall of the wax cylinder 101 is operated to melt the wax filled in the wax cylinder 101 into the reaction vessel, and the nozzle 105 at the tip of the wax cylinder 101, The position of the wax cylinder 101 is adjusted by the lateral movement portion 170 and the elevation portion 180 so as to be aligned with the sprue 193 of the mold 190 in a straight line.

Since the hydraulic cylinder 160 is installed above the mold 190 by the guide frame 161 and the mold 190 can only be arranged between the guide frames 161, Therefore, not only the mold opening operation of the mold 190 but also the operation of extracting the wax mold from the mold 190 is dependent on the manual operation of the operator. Therefore, not only the wax injection operation but also the solidification- It is not possible to automate the operation for extracting the wax model, and thus the working efficiency and the productivity of the wax model are deteriorated.

Published Patent No. 10-2009-0099207

The present invention has been proposed in order to solve the problems of the above conventional wax injection machine. In order to automate the wax molding process by the wax injection machine, The objective of the present invention is to automate not only the injection operation of the wax but also the operation of ejecting the wax model from the mold by improving the performance of the loading table.

According to an aspect of the present invention, A wax mixing part installed at one side of the frame part for receiving and melting and mixing wax to be used for injection; A wax injection part connected to a discharge side of the wax mixing part and injecting the molten wax of the wax mixing part into a mold so as to be molded into a mold; A mold holder for placing the mold in a state in which the mold is injectable at a position adjacent to the nozzle tip of the wax injection part; And a model extracting unit for extracting a molded wax model from the mold opened by the entirety of the mold storage unit, the mold loading unit including a table for loading the mold to support the mold in an injectable state; And a pressure plate provided so as to face the upper side of the table and pressing down the mold loaded on the table. The table provides a wax extruder having a rotatable table rotatable so that the mold can be changed from an injection position where the wax can be injected to an exit position where the wax model can be extracted or vice versa.

In addition, the table may be configured to load two molds at the injection position and the ejection position, respectively, so as to sandwich the fixing protrusions protruding from the respective mold bottoms, in a direction perpendicular to the moving direction of the nozzle tips The pressing plate preferably has a recess formed in the bottom surface thereof in parallel with the table groove so as to sandwich a protrusion protruding from the upper surface of the mold.

Further, the table is configured to rotate in the forward and reverse directions around the rotation axis, to move the mold, in which the injection of the wax is finished, to the take-out position and to discharge the wax model out of the wax model at the take- A rotary plate for respectively moving to the injection position; A support plate disposed to be superimposed under the rotation plate and rotatably supporting the rotation plate and the rotation axis; A drive motor mounted on one side of the support plate for rotating the rotation plate in the forward and reverse directions through the rotation axis; And a gear train mounted between the motor shaft of the drive motor and the rotation shaft and transmitting the rotational force of the drive motor to the rotation shaft.

Wherein the model output unit comprises: a right angle type gripper which is arranged to face each other and faces the mold, the gripper gripping the model of the mold which has been molded with a pair of hands moving horizontally and horizontally and moved to the takeout position; And a right angle type robot arm for moving the gripper according to a rectangular coordinate system so that the mold can be extracted from the mold.

According to the wax extruder provided with the rotary table of the present invention, the table supporting the mold as a part of the entirety of the mold holder can be rotated in the forward and reverse directions, so that two molds are simultaneously arranged on the table, So that the wax injection from the injection position to the mold can be automatically performed and the wax model can be automatically extracted from the mold at the position of the injection. The entire process is automatically carried out except that the mold is loaded in the front part and the wax to be used for injection is injected into the wax mixing part. Therefore, efficiency and productivity of the injection operation can be greatly improved.

In addition, since only the amount of wax determined by the position sensor mounted in the injection cylinder can be injected into the mold, it is possible to maintain the injection amount of the wax at a constant level, thereby improving the quality of the wax model.

1 is a schematic view of a conventional wax extruder;
2 is a side view of a wax extruder having a rotary table according to an embodiment of the present invention;
Figure 3 is a plan view of Figure 2;
Figure 4 is a front view of Figure 2;
5 is an enlarged view of the injection pack shown in Fig.
6 is an enlarged view of the nozzle bundle shown in Fig.
Fig. 7 is a front view of Fig. 6; Fig.
8 is an enlarged view of the table shown in Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a wax extruder having a rotary table according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The wax injection machine according to the present invention includes a frame 2, a wax mixing portion 3, a wax injection portion 5, a mold holder 6, And a model output unit (7).

As shown in FIGS. 2 to 4, the frame part 2 is a part of the support body of the wax extruder 1, and is formed of a plate having various sizes and shapes. In particular, It is preferable that the side plate 11 has a C shape in order to install the mold mounting portion 6 so as not to interfere with the operation of the mold releasing portion 7 that takes out the molded F from the mold M . The pressing plate 62 of the mold holding portion 6 and the table 61 of the mold holding portion 6 at the lower end of the opening can be disposed facing each other at the upper end of the opening end of the side plate 11, The side plate 11 is a model in which the table 61 and the pressing plate 62 or related parts thereof are capable of loading the mold M between the table 61 and the pressure plate 62, It is possible to prevent the operation of the output section 7 from being disturbed at all.

3 and 4, the wax mixing portion 3 is provided on one side of the frame portion 2, that is, on the left side in the drawing, as shown in Fig. 3 and Fig. 4, A heater is installed on the outer wall or on the inside of the outer wall so as to be able to contain the wax of the radial stirring blade 13 around the axis as shown in FIG. Is rotatably installed. 5, the wax mixing section 3 is provided with an injection tube 15 between the wax injection section 5 and the wax injection section 5 at the lower end side, and the molten wax is injected through the injection tube 15 To the wax injection part (5). However, a check valve is provided in the injection pipe 15 so that the molten wax injected into the injection bottle 8 of the wax injection part 4 can not flow back into the wax mixing part 3.

The wax injection part 5 is a part for squeezing the molten wax injected from the stomach wax mixing part 3 into the mold M and as shown in Figs. 2, 3 and 5, the injection wastes 8, And the nozzle bundle 9 may be integrally formed into one bundle as in the case of the wax extruder shown in FIG.

Here, the injection bottle 8 is connected to the discharge side of the wax mixer 3 through the injection pipe 15 and connected to the injection side of the nozzle assembly 5 through the discharge pipe 17. To this end, the injection pack 8 is further comprised of an injection cylinder 21 and an injection cylinder 23, as shown in detail in Fig.

5, the injection tube 21 is a container means for receiving the molten wax injected from the injection bottle 8, and the injection tube 15 is, for example, And the molten wax of the wax mixing part 3 is injected through the injection pipe 15. The injected molten wax is temporarily accommodated until the molten wax is squeezed and the injection pipe 15 is provided at the front end so as to squeeze the accommodated wax. Lt; / RTI > The injection cylinder 23 is an extrusion means for pushing the wax temporarily accommodated in the injection cylinder 21 to the nozzle bundle 5 and is installed side by side on the rear side of the injection cylinder 21 as shown in FIG. The plunger 33 at the tip of the push rod 31 is reciprocated along the inner circumferential surface of the injection cylinder 21 to squeeze the molten wax filled in the injection cylinder 21 into the nozzle bundle 5. [ Therefore, when the sensing means such as a position sensor is installed inside the injection cylinder 23 to measure the moving distance of the plunger 33, the injection amount of the wax injected into the mold M can be checked , So that a predetermined amount of wax can be injected into the mold (M).

The nozzle bundle 5 is a conduit means for guiding the wax discharged from the upper injection mold 4 to the mold M and injecting the wax into the injection mold 8 as shown by an arrow A in FIG. And the wax supplied from the injection pack 8 is injected into the mold M through the nozzle 41 at the front end.

6 and 7, the nozzle bundle 5 includes a nozzle 41, a nozzle cylinder 43 and an elevating assembly 45. The nozzle 41 includes a nozzle 41, It can be changed up and down as well as before and after. 6, the nozzle tip 47 at the tip end is opened toward the mold M, and the wax injected from the discharge pipe 17 flows into the hollow inner space It is temporarily filled. 6 and 7, the nozzle cylinder 43 is fitted to the lift plate 51 so as to be installed side by side behind the nozzle 41 and is supported by the nozzle frame 53, The nozzle 41 is moved forward and backward in accordance with the forward and backward movement of the push rod 48 so that the nozzle tip 47 is brought into contact with or separated from the locate ring of the mold by engaging the nozzle 41 to the tip of the rod 48. At this time, the guide rod 49 is connected to the rear end so that the nozzle 41 can move more stably. The guide rod 49 is extended in parallel with the push rod 48, 51 so as to guide the nozzle 41 stably. The lifting and lowering assembly 45 vertically moves the nozzle cylinder 43 and the guide rod 41 up and down through the lifting and lowering plate 51. The lifting and lowering rod 57 moves up and down by the lifting and lowering motor 55, The nozzle 41 and the nozzle 41 connected to the tip of the nozzle cylinder 43 and the guide rod 41 are lifted up and down.

The mold mounting part 6 is a means for positioning a mold M to be used for wax injection on the wax injector 1 in a state of being injectable and as shown in Figures 2 to 4, The mold M is placed at a position adjacent to the nozzle tip 47 to prepare injection of the wax into the mold M. To this end, the mold loading part 6 comprises a table 61 and a pressure plate 62, as shown in Figs.

2 and 4, the table 61 is a part for supporting the mold M used for injection, and is arranged so as to be positioned in front of the nozzle bundle 5, And is installed at the lower end of the opening end of the mold 11 so that the two molds M can be simultaneously put on the work. That is, the table 61 has two injection positions, one at the injection position where the molten wax is injected by the wax injection part 5 and one at the injection position where the wax model is taken out from the injection mold M So that the mold M can be loaded at the same time.

3, it is preferable that the table 61 is formed in the form of a disk having a sufficient width so that the two molds M can be disposed facing each other, that is, 180 degrees apart, At least two table grooves 66 are recessed so as to engage with the fixing protrusions 65 protruding from the bottom of the mold M. The table grooves 66 are formed by the nozzle tips 47, As shown in Fig. Accordingly, the mold M can be stably held in position, such as being pressed and held by the nozzle bundle 5, as long as the fixing protrusions 65 are fitted in the table grooves 66. [ On the other hand, the table 61 is provided with a plurality of locking means 69 along the rim, and the locking means 69 is equipped with a pivotal hook 68 at its upper end. The pivotal hook 68 is pivotally rotated while being elastically moved upward and downward so that the mold M and the mold lid MC are pressed by pressing the pushing piece 71 protruding from the side surface of the mold M, MC) without moving.

2 to 4, the table 61 includes a rotation plate 75, a support plate 76, a drive motor 77, and a gear train (not shown) so that the position of the metal mold M can be varied. 78).

2 to 4, the rotating plate 75 is integrally formed in a disc shape and includes a rotating shaft 79 coupled to the shaft, And is rotatable in the forward and reverse directions about the center. Accordingly, the mold M in which injection of the wax is finished in the injection position is moved to the ejection position, and the mold M in which the wax model is completely ejected in the ejection position is moved to the injection position . The support plate 76 supports the rotary plate 75 and the rotary shaft 79 in a rotatable manner. The support plate 76 is disposed under the rotary plate 75 and is formed in a disc shape. The support plate 76 is fixedly coupled to the lower end of the open end of the side plate 11 and rotatably supports the rotation plate 75 through a thrust bearing 67 fitted to the rotation shaft 79. The driving motor 77 is a part for generating a rotating force of the rotating plate 75 and is mounted on one side of the bottom surface of the supporting plate 76 and rotates the rotating shaft 79 connected thereto via the gear train 78, Thereby rotating the rotary plate 75 in the forward and reverse directions. The gear train 78 is a portion for connecting the output shaft of the drive motor 77 and the rotary shaft 79 to transmit the rotational force generated by the drive motor 77 to the rotary plate 75, And a driven gear 94 coupled to the lower end of the rotary shaft 79 so as to be engaged with the drive gear 93. [

The pressure plate 62 is a portion for pressing and fixing the mold M placed on the table 61 while the wax is injected and molded. The pressure plate 62 is fixed to the table 61 as shown in FIG. 2 and FIG. The mold M is pressed down strongly by the pressing force of the loading cylinder 63 at the time of wax injection so that the original M is pressed down by the nozzle bundle 5 even though the nozzle M is pressed by the nozzle bundle 5. [ Position. 2 and 4, the presser plate 62 is manufactured in the form of a rectangular plate and abuts on the upper surface of the cover MC of the mold M, and as in the case of the table 61, the mold cover MC At least two or more pressing plate grooves 74 are concavely formed in the bottom surface in a direction parallel to the table grooves 66 so that the elevating protrusions 73 protruding from the upper surface of the table grooves 66 can be inserted. After the injection is completed, the mold cover M is lifted up through the lifting protrusion 73 caught in the pressure plate groove 74, and the mold M is lifted up Open.

The mold release portion 7 is a portion for removing the molded wax pattern from the mold M and is disposed adjacent to the outer periphery of the mold holding portion 6 as shown in Figs. Various kinds of automation equipment can be applied regardless of the form, the method or the size, if the wax model which has been formed from the mold (M) which is opened by the mold loading unit (6) However, a rectangular-shaped robot is employed as shown in the present embodiment.

2 and 3, the model extracting section 7 includes a right angle type gripper 81 and a right angle type robot arm 83. As shown in FIG. 2, the rectangular gripper 81 is a means for gripping the model in the opened mold M after the molding is completed. The rectangular gripper 81 includes a substrate 84 And a pair of hands 85 that are disposed on the board 84 so as to face each other and move in the horizontal direction in the horizontal direction to directly grip the model. At this time, the shape of the hand 85 can also be varied in various ways, and in this embodiment, it takes the form of a hook having a hook-shaped cross section.

As shown in FIGS. 2 and 3, the rectangular arm type robot arm 83 includes a first arm 87 disposed along the xyz axis, The gripper 81 is moved from the initial position to the target position by the second arm 88 and the third arm 89 to the initial position and the mold gripped by the gripper 81 is discharged from the mold M . At this time, as is well known, the first arm 87 is horizontally fixed to the outer supporting end, and the second arm 88 is orthogonal to the first arm 87 and is slidably connected in the horizontal direction, The third arm 89 is orthogonal to the second arm 88 and is slidably connected in the axial direction of the second arm 88. The third arm 89 is vertically and horizontally slidable relative to the second arm 88, As shown in FIG.

Now, the operation of the wax extruder 1 having the rotary table according to the preferred embodiment of the present invention will be described as follows.

In order to produce a wax model using the wax injector 1 of the present invention, first, a solid wax is introduced into the wax mixing portion 3. After the addition, the stirring wing 13 is driven while heating the wax mixing portion 3 to stir the solid wax at the same time as melting. In this process, impurities such as water contained in the wax are removed in the form of bubbles.

After the stirring operation is continued for a predetermined time, if the residual bubbles are sufficiently removed, first, the mold M is loaded on the die holder 6 as a preparation work for wax injection. To this end, the elevating protrusions 73 protruding from the upper surface of the mold lid MC are inserted into the pressure plate grooves 74, and two dies M are arranged one by one at the injection position and the extraction position of the table 61 . At this time, the fixing protrusion 65 projected on the bottom surface of each mold M is inserted into the table groove 66 to fix the mold M.

When the loading of the mold M is completed in this way, the loading cylinder 63 is operated to lower the pressure plate 62 so that the mold cover MC and the mold M are combined. When the assembling is completed, the loading cylinder 63 raises the pressing force against the pressing plate 62 and presses the mold M downward.

Thereafter, when the pressing force of the loading cylinder 63 reaches a set value, the nozzle cylinder 43 of the nozzle bundle 5 starts to move the nozzle 41 in the direction of the arrow B in Fig. Is inserted into the locating ring of the mold M as shown in Fig. At this time, since the nozzle cylinder 43 is not provided with a limit switch separately, the nozzle cylinder 43 continues to advance after the operation is started. As a result, after the nozzle 41 contacts the mold M, the nozzle cylinder 43 strongly presses the mold M, while the mold M is pressed down by the loading cylinder 63 and fixed, not moving.

When the injection preparation is completed in this way, the injection cylinder 23 starts to operate, and the molten wax of the wax mixing part 3 is squeezed into the nozzle bundle 5. In the injection cylinder 21, The wax discharged by the nozzle is supplied to the nozzle 41 through the discharge pipe 17 and is injected into the mold M through the nozzle tip 47. At this time, when the moving distance of the plunger 33 or the like can be measured in the injection cylinder 23, the amount of the wax to be injected into the mold M can be checked, .

When the injection to the mold M is completed at the injection position, the drive motor 77 of the table 61 is operated to rotate the rotary shaft 79 and the rotary plate 75 in the forward direction through the gear train 78, And the injection mold M is rotated forward by 180 degrees to the take-out position. At the same time, the mold (M) at the exit position is also rotated 180 degrees and loaded into the injection position.

While the above-described wax injection operation is repeated, the wax model in the mold M at the ejecting position is cooled, for example, by air cooling or through a cooling pipe embedded in the rotary plate 75, and molded into a wax model. At this time, the cooling time is controlled by a timer. That is, after the cooling is started, the timer is operated so that cooling is performed for a predetermined time.

When the molding is completed, the model extracting section 7 operates to extract the model from the mold M at the extraction position. As shown in FIG. 2, the gripper 81 can easily grasp the model in the mold M Then, the gripper 81 transfers the model to the outside by transferring the model held by the robot arm 83 along the rectangular coordinates, for example, to the belt conveyor 91 shown in FIG. 2 by the operation of the robot arm 83 . On the other hand, during the taking-out operation of the model, the injection cylinder 23 is primarily moved backward in the mold M at the injection position so that the molten wax is no longer discharged from the injection cylinder 21 and the nozzle cylinder 43 And the nozzle tip 47 is separated from the mold M by backward movement. Then, the loading cylinder 63 is raised to separate the mold lid MC from the mold M to expose the molded wax pattern to the outside, and to prepare for movement to the take-out position.

When the injection of the wax is completed at the injection position and the injection of the wax is completed, the table 61 is rotated in the reverse direction to advance the next injection and injection. Injection molding can be repeatedly performed.

1: wax injector 2: frame part
3: wax mixing part 5: wax injection part
6: All mold parts 7: Model release part
8: injection nozzle 9: nozzle nozzle
13: stirring blade 15: injection tube
17: discharge pipe 21: injection pipe
23: injection cylinder 31: push rod
33: plunger 41: nozzle
43: nozzle cylinder 45: lift assembly
47: nozzle tip 51:
61: Table 62: Platen
63: Loading cylinder 65: Fixing projection
71: pushing piece 73:
75: Spinning plate 76:
77: drive motor 78: gear train
81: gripper 83: robot arm
85: hand 91: belt conveyor
M: Mold MC: Cover

Claims (4)

A frame part (2) constituting a support body;
A wax mixing part 3 installed at one side of the frame part 2 for receiving and melting and mixing the wax to be used for injection;
A wax injection part 5 connected to the discharge side of the wax mixing part 3 and injecting the molten wax of the wax mixing part 3 into a mold M so as to be molded into a model;
A mold holder (6) for positioning the mold (M) in a state in which the mold (M) is injectable at a position adjacent to the nozzle tip (47) of the wax injection part (5); And
And a model extractor (7) for extracting and transferring a molded wax model from the mold (M) opened by the mold loading part (6)
The mold mounting part (6)
A table (61) for loading the mold (M) to support the mold (M) in an injectable state; And
And a pressure plate 62 provided so as to face the upper surface of the table 61 and pressing the mold M loaded on the table 61 downward.
The table (61) is rotatable so that the mold (M) can be changed from an injection position at which wax can be injected to an extraction position where the wax model can be extracted or vice versa. One wax injection machine. The method according to claim 1,
The table 61 is configured to load two molds M at the same time at the injection position and the exit position and to fix the fixing protrusions 65 protruding from the bottom of each mold M, And a table groove (66) recessed in the upper surface in a direction perpendicular to the moving direction of the nozzle tip (47)
The pressing plate 62 is provided with a pressing plate groove 74 which is recessed in the bottom surface in parallel with the table groove 66 so as to insert a lift projection 73 protruding from the upper surface of the mold M. The wax injection device comprising: The method according to claim 1 or 2,
The table (61)
The mold (M) which has been rotated in the forward and reverse directions about the rotary shaft (79) and has completed the injection of the wax at the injection position into the take-out position and the mold M) to the injection position, respectively;
A support plate 76 disposed under the rotation plate 75 and rotatably supporting the rotation plate 75 and the rotation shaft 79;
A drive motor 77 mounted on one side of the support plate 76 to rotate the rotation plate 75 in the forward and reverse directions via the rotation axis 79; And
And a gear train 78 mounted between the motor shaft 79 of the drive motor 77 and the rotary shaft 79 to transmit the rotational force of the drive motor 77 to the rotary shaft 79 Wherein the wax extruder is a wax extruder. The method according to claim 1,
The model output section (7)
A right angle type gripper 81 for gripping the model of the mold M that has been formed into a pair of hands 85, which are arranged to face each other and move horizontally and in proximity to each other and moved to the take-out position; And
And a right angle type robot arm (83) for moving the gripper (81) along a rectangular coordinate system so that the mold can be extracted from the mold (M).

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