JP6090236B2 - Slide core extraction method, slide core extraction control device and core molding device in core molding device - Google Patents

Description

  The present invention relates to a method for pulling out a slide core in a core molding device from a molded core, a control device therefor, and a core molding device provided with the control device.

  Conventionally, a cylinder head of an engine is cast with a sand core set in a mold in order to form a cooling water passage (W / J) therein. This core is made by blowing and pressurizing sand whose surface is coated with resin into a core molding die.

  Since the cylinder head core of such an engine has a complicated shape, there is a case in which a slide core that can move forward and backward from the side into the cavity is provided in addition to simply setting a mold.

  For example, Patent Document 1 proposes a technique for improving the efficiency of core molding by installing a slide core so that it can be advanced and retracted from above a mold and can be automatically operated.

JP 2008-238231 A

  By the way, the core filled around the slide core is said to be difficult to mold, for example, the thickness is partially different or there is a part where the draft angle of the slide core is small. If you try to pull it out at once, the core breaks or scratches due to the fact that the surface of the slide core is in contact with the resin, or the die is tilted during the punching operation due to the large punching resistance. There was a problem to do.

  However, in Patent Document 1, although the efficiency of the core molding is improved, no consideration is given to a mechanism for suppressing damage to the core when the slide core is pulled out.

  The present invention has been made in view of such points, and the object of the present invention is to improve the operation of the core by retracting the slide core from the shape part having a small draft and pulling it out. The purpose is to suppress the occurrence of breakage and scratches and to improve the yield of the core.

  In order to achieve the above object, according to the present invention, when the slide core is retracted and pulled out, there is a difference in the amount of movement between two portions of the plate that are separated from each other in the direction perpendicular to the slide core pulling direction. Extraction was performed while adjusting the amount of movement of both sites so as not to exceed the fixed amount.

  Specifically, the slide core pulling method according to the first invention is a method of pulling out the slide core in the core molding device from the molded core, and the slide core is fixed on a plate. The two parts of the plate that are separated from each other in the direction orthogonal to the slide core pulling direction are moved in the pulling direction by a pair of actuators. The slide core is pulled out by the both actuators while allowing the plate to tilt with respect to the pulling direction while adjusting so as not to occur.

  According to the present invention, by adjusting the amount of movement of both parts of the plate when the slide core is pulled out, even if the slide core has a small draft and a large draft resistance, the inclination of the slide core with respect to the drawing direction can be adjusted. Can be pulled out to a minimum. In addition, by adjusting the amount of movement of both the parts as described above, it is possible to suppress the excessive inclination of the slide core and to minimize the load applied to the bonding surface between the core and the slide core. The slide core can be pulled out without damaging it.

  Further, in the slide core pulling method according to the second aspect of the present invention, in the first aspect of the invention, the adjustment of the movement amount between the two parts is performed when the difference between the movement amounts reaches the predetermined amount. The slide core is continuously pulled out while restricting the movement of the part.

  According to the present invention, by adjusting the amount of movement of the two parts, the two parts of the plate are moved almost alternately in the drawing direction with a minimum inclination. For this reason, the adhesive surface between the core and the slide core can be gradually and alternately peeled from the end side of the slide core located on both sides of the plate, and the slide core can be pulled out without damaging the core. Can do.

  The slide core pulling method according to the third aspect of the present invention is the first or second aspect of the present invention, wherein the adjustment of the movement amount of both the parts is performed at the initial stage of the entire pulling step of the slide core.

  According to the present invention, since the adhesive force between the core and the slide core is greatest immediately after molding, the slide core can be detached by adjusting the amount of movement of the two parts at the initial stage of the slide core drawing process. It is possible to effectively suppress the damage to the core caused by. In addition, by adjusting the movement amount of both the parts only at the initial stage of the pulling process, the slide core can be pulled out by a quick operation after the bonding surface between the core and the slide core is peeled off. Efficiency can be improved.

  The slide core pulling method according to a fourth aspect of the present invention is the first to third aspects of the invention, wherein the actuator is an electric cylinder.

  According to the present invention, since the position of the plate can be accurately and reliably controlled by controlling the motor rotation speed of the electric cylinder, the movement amount of both the parts can be adjusted more accurately. it can.

  A slide core pull-out control device according to a fifth aspect of the present invention is a pull-out control device for pulling out the slide core in the core molding device from the molded core, and a plate to which the slide core is fixed. A pair of actuators provided in the plate for moving in the pulling direction two parts separated in the direction perpendicular to the slide core pulling direction in the plate, and control means for controlling the operations of the two actuators; Position detecting means for detecting the amount of movement of the two parts of the plate in the pulling direction, and the control means moves the two parts based on the amount of movement of the two parts detected by the position detecting means. While adjusting the amount so that a difference of a predetermined amount or more does not occur between the two, allowing the plate to tilt with respect to the drawing direction, As the core is withdrawn, and controls the operation of the actuator.

  According to the present invention, when the slide core is pulled out, the movement amount in the pulling direction of both parts of the plate is detected by the position detection means, and the operation of the actuator is controlled by the control means based on the movement amount, so that both parts of the plate The amount of movement is adjusted. The adjustment of the amount of movement of both parts is an operation of pulling out the slide core with minimum inclination with respect to the pulling direction even if the slide core has a small draft and a large pulling resistance. By adjusting the amount of movement, it is possible to suppress the excessive tilt of the slide core and minimize the load on the bonding surface between the core and the slide core, and pull out the slide core without damaging the core. Can do.

  In the slide core pull-out control device according to the sixth invention, in the fifth invention, the control means shares information on the movement amounts of both the parts detected by the position detection means, and When the difference reaches the predetermined amount, the operation of the actuator is controlled so that the slide core is continuously pulled out while restricting the movement of the portion having the larger movement amount.

  According to the present invention, by adjusting the movement amount of both parts by the two actuators, the two parts of the plate are moved almost alternately in the drawing direction with a minimum inclination. For this reason, the adhesive surface between the core and the slide core can be gradually and alternately peeled from the end side of the slide core located on both sides of the plate, and the slide core can be pulled out without damaging the core. Can do.

  Further, in the slide core pull-out control device according to the seventh invention, in the fifth or sixth invention, the control means adjusts the movement amount of the both parts by the operation control of the actuator. It is set as the structure performed at the initial stage of a drawing-out process.

  According to the present invention, since the adhesive force between the core and the slide core is greatest immediately after molding, the slide core can be detached by adjusting the amount of movement of the two parts at the initial stage of the slide core drawing process. In addition to effectively preventing damage to the core caused by the core, the slide core can be pulled out by a fast motion after the adhesive surface between the core and the slide core has peeled off, improving work efficiency. it can.

  According to an eighth aspect of the present invention, in the fifth to seventh aspect of the invention, the actuator is an electric cylinder.

  According to the present invention, since the position of the plate can be accurately and reliably controlled by controlling the motor rotation speed of the electric cylinder, the movement amount of both the parts can be adjusted more accurately. it can.

  A core molding apparatus according to a ninth aspect is characterized by including any one of the slide core pulling-out control apparatuses according to the fifth to eighth aspects.

  According to the present invention, a core molding apparatus for molding a core having a complicated structure including a slide core includes the slide core pulling control device according to the present invention, so that when the slide core is pulled, Generation of the child's breakage and scratches can be effectively suppressed, and the productivity of the core can be improved.

  As described above, according to the present invention, when the slide core is retracted and pulled out from the shape portion having a small draft angle, the two plates are separated from each other in the direction orthogonal to the slide core pulling direction. By pulling out while adjusting the positions of the two parts so that the difference in the amount of movement does not exceed a predetermined amount, the yield of the core can be improved by suppressing the occurrence of breakage or damage to the core.

FIG. 1 is a plan view of a slide core and a lower mold of the core molding apparatus according to the first embodiment of the present invention. FIG. 2 is a view showing a core molded by the core molding apparatus shown in FIG. 2A is an overall perspective view of the core, and FIG. 2B is a cross-sectional view taken along the line IIb-IIb in FIG. FIG. 3 is an enlarged perspective view of the slide core advance / retreat control device of the core molding device shown in FIG. FIG. 4 is an enlarged perspective view of the slide core advance / retreat control device shown in FIG. 1 as viewed from above the slide core side. FIG. 5 is a diagram for explaining a process of molding the core using the core molding apparatus shown in FIG. FIG. 6 is a diagram showing a change in the amount of movement of the electric cylinder head when the slide core is pulled out in the core molding method. FIG. 7 is a view corresponding to FIG. 1 showing the core molding apparatus according to the second embodiment of the present invention. 8 is an enlarged perspective view of the slide core advance / retreat control device of the core molding device shown in FIG. 7 as viewed from the upper rear side. FIG. 9 is an enlarged perspective view of the slide core advance / retreat control device shown in FIG. 7 as viewed from the right rear side. FIG. 10 is a diagram for explaining a process of molding a core using the core molding apparatus shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or its application.

[First Embodiment]
(Core molding equipment)
As shown in FIG. 1, the core molding apparatus 1 according to the first embodiment of the present invention is for modeling a W / J core 2 for partitioning a water jacket in a cylinder head of an engine. , An upper die (not shown), a lower die 3, a slide core 4, and a slide core advance / retreat control device 5 as a slide core withdrawal control device for withdrawing the slide core 4 from the upper die and the lower die 3. And.

  As shown in FIG. 2 (a), the core 2 to be molded by the core molding apparatus 1 includes parts 2a and 2b formed by the upper mold and the lower mold 3, and an undercut portion 2c therebetween. Consists of. As shown in FIG. 2B, the undercut portion 2c is formed by the slide core 4 inserted in the molding process. The slide core 4 is configured to be capable of moving forward and backward along the arrow direction in FIG. As shown in FIG. 2B, the maximum depth of the undercut portion 2c is, for example, 55 mm, and the minimum draft is, for example, about 1 °.

  As shown in FIG. 1, the lower mold 3 is provided on the lower mold plate 6 of the core molding apparatus 1 via an intermediate plate 7.

  The slide core 4 is disposed on the intermediate plate 7 such that the tip 4a of the slide core 4, that is, the portion constituting the undercut portion 2c faces the lower mold 3. The base end portion 4b of the slide core 4 is fixed on a seal plate 8 as a plate, and the seal plate 8 moves away from the lower die 3 in the forward direction toward the lower die 3 (upward in FIG. 1). The entire slide core 4 is configured to be movable back and forth with respect to the lower mold 3 by moving back and forth in the rear direction (the same lower direction).

(Slide core advance / retreat control device)
The slide core advance / retreat control device 5 shown in FIG. 1 controls the position of the seal plate 8 to form the slide core 4 and the undercut portion 2c of the core 2 before the core 2 is formed. It is inserted between the upper mold and the lower mold 3, and the position of the slide core 4 is maintained by holding the position of the seal plate 8 during the molding of the core 2, and after the molding of the core 2 is molded. It has a role of pulling out the slide core 4 from the core 2.

  The slide core advance / retreat control device 5 includes the seal plate 8 to which the base end portion 4b of the slide core 4 is fixed, and two portions separated in the left-right direction perpendicular to the slide core pull-out direction in the seal plate 8; That is, in the present embodiment, a pair of left and right electric cylinders 14a and 14b are provided as actuators for moving both end portions 8a and 8b of the seal plate 8 in the pulling direction. The electric cylinders 14a and 14b incorporate a position detection unit (not shown) including, for example, an encoder as a position detection unit. The position detection unit and the electric cylinders 14a and 14b include a control device 21 (control unit). ) To be able to send and receive signals.

  The electric cylinders 14a and 14b advance the seal plate 8 in a direction toward the lower mold 3 when the slide core 4 is inserted, and positions of both end portions 8a and 8b of the seal plate 8 when the slide core 4 is pulled out. This is for retracting the seal plate 8 while adjusting. The electric cylinders 14a and 14b can accurately and reliably control the retreating operation of the seal plate 8 by controlling the motor rotation speed, so that the movement amounts of both end portions 8a and 8b are accurately controlled. be able to.

  As shown in FIGS. 1 and 3 (in FIG. 3, the right side electric cylinder 14b and the control device 21 are omitted), the electric cylinders 14a and 14b have electric cylinder stays 15a, The intermediate plate 7 is fixedly supported by 15b. The ends of the electric cylinder heads 16a and 16b connected to the output portions of the electric cylinders 14a and 14b are connected to both end portions 8a and 8b of the seal plate 8, respectively. The electric cylinder heads 16 a and 16 b are provided with slide guides 17 a and 17 b for guiding the movement of the seal plate 8.

  As shown in FIG. 4, the slide guide 17a includes an upper plate 17a1, a support column 17a2, and a lower plate 17a3. Between the upper plate 17a1 and the lower plate 17a3, an outer end opposite to the inner end fixed to the seal plate 8 in the electric cylinder head 16a is slidably held in the front-rear direction. ing. Accordingly, the movement of the seal plate 8 and the slide core 4 fixed to the seal plate 8 is limited to the forward and backward movement in the front-rear direction by the slide guides 17a and 17b.

  The position detectors (position detecting means) built in the electric cylinders 14a and 14b are for detecting the movement amount (extension / retraction operation position) of the electric cylinder heads 16a and 16b. Therefore, before the core 2 is formed, the position detection unit detects the amount of movement of the slide core 4 in the insertion direction of the electric cylinder heads 16a and 16b. After the molding of the core 2, the amount of movement in the pulling direction from the position of the electric cylinder heads 16a, 16b immediately after molding, that is, the amount of movement of the both end portions 8a, 8b of the seal plate 8 in the pulling direction is detected. To do.

  The control device 21 is for controlling the operation of the electric cylinders 14a and 14b based on the amount of movement of the electric cylinder heads 16a and 16b detected by the position detector. Therefore, the control device 21 inserts the slide core 4 into an appropriate position during molding based on the movement amount of the electric cylinder heads 16a, 16b detected by the position detection unit before molding the core 2. Thus, the electric cylinders 14a and 14b are operated. Further, during the molding of the core 2, the control device 21 stops the operation of the electric cylinders 14 a and 14 b so that the slide core 4 does not move. After the molding of the core 2, based on the movement amount of the electric cylinder heads 16a, 16b detected by the position detection unit, that is, the movement amount in the pulling direction of the both end portions 8a, 8b of the seal plate 8, The slide core 4 is pulled out by adjusting the operation of the electric cylinders 14a and 14b while suppressing an excessive inclination of the seal plate 8 with respect to the pulling direction.

(Core molding method)
Next, a method for forming the core 2 by the core molding apparatus 1 will be described. In the initial stage, as shown in FIG. 5A, the electric cylinders 14a and 14b are in a state of returning to the contracted original position (retracted position). At this time, the operating position of the electric cylinders 14a and 14b is set to 0 point, and it is confirmed that the electric cylinders 14a and 14b have been pushed to the set error.

  Next, as shown in FIG. 5 (b), the electric cylinders 14a and 14b are extended, the slide core 4 is advanced and inserted to the molding position of the core 2, and the extension stroke ends of the electric cylinders 14a and 14b are reached. The operation is stopped and the slide core 4 is held at the molding position. Then, after resetting the zero point of the electric cylinders 14a and 14b, the molding operation of the core 2 is performed.

  After the molding of the core 2 is completed in this way, the electric cylinders 14a and 14b are contracted while the positions of the electric cylinder heads 16a and 16b are adjusted, and the slide core 4 is pulled out, as shown in FIG. The molding process is completed in a state where the electric cylinders 14a and 14b are returned to the original positions. The present invention has a feature in the operation when the slide core 4 is pulled out after the core 2 is formed, which will be described in detail below.

(How to pull out the slide core)
When the slide core 4 is pulled out, the control device 21 shares information about the movement amount in the pulling direction of the left and right ends 8a and 8b of the seal plate 8 detected by the position detection unit, and the electric cylinder 14a. , 14b are synchronized. And based on the amount of movement of the both ends 8a, 8b detected by the position detector, while adjusting the amount of movement of the both ends 8a, 8b so that a difference of a predetermined amount or more does not occur between them, The operation of the electric cylinders 14a and 14b is controlled so that the slide core 4 is pulled out while allowing the seal plate 8 to tilt with respect to the pulling direction.

  Here, the adjustment of the movement amount of the both end portions 8a and 8b is performed when the difference in the movement amount between the both end portions 8a and 8b of the seal plate 8 reaches the predetermined amount. The pulling out of the slide core 4 is continued while restricting the operation of the above.

  Specifically, for example, when the difference in the amount of movement from the position where the slide core 4 is in contact with the core 2 between the left end 8a and the right end 8b of the seal plate 8 reaches 0.5 mm, the left end When the portion 8a is pulled out larger than the right end portion 8b, the pulling operation of the left end portion 8a is stopped until the movement amount of the right end portion 8b becomes the same as the movement amount of the left end portion 8a. The difference should not exceed 0.5 mm.

  FIG. 6 shows temporal changes in the amount of movement of both end portions 8a and 8b of the seal plate 8, that is, the amount of movement of the electric cylinder heads 16a and 16b accompanying the contraction operation of the electric cylinders 14a and 14b. In the figure, the solid line shows the change of the electric cylinder head 16a, and the broken line shows the change of the movement amount of the electric cylinder head 16b. For example, the contraction operation speed of the left electric cylinder 14a is made faster than that of the right electric cylinder 14b. When the left electric cylinder 14a contracts and the electric cylinder head 16a is first pulled out by 0.5 mm, the electric cylinder 14a Is temporarily stopped (S1 in the figure), and the operation of the electric cylinder head 16a is continued until the electric cylinder head 16b is pulled out by 0.5 mm by the right electric cylinder 14b and the movement amount of both is the same. Stop (S2). When the amount of movement is the same, the left electric cylinder 14a is contracted again at a speed faster than that of the right electric cylinder 14b, and thereafter, the adjustment of the movement amounts of both end portions 8a and 8b is repeated. Further, as shown in FIG. 6, the contraction operation speed of the left and right electric cylinders 14a and 14b is reversed in the middle of adjusting the movement amount of the both ends 8a and 8b, and the electric cylinder head 16b is moved to the electric cylinder head 16a. In this configuration, the electric cylinder head 16b is stopped until the movement amounts of the two are the same (S4), and the movement of both ends 8a and 8b is performed. Repeat volume adjustment. Then, when the amount of movement of both becomes 3 mm, for example (S5), the adjustment of the amount of movement of the both end portions 8a and 8b is finished, and thereafter both are pulled out at a constant pulling speed.

  According to the present embodiment, by adjusting the movement amount of the both end portions 8a and 8b of the seal plate 8, the both end portions 8a and 8b are moved almost alternately in the drawing direction with a minimum inclination. For this reason, the adhesive surface between the core 2 and the slide core 4 can be gradually and alternately peeled from the end side of the slide core 4 located on the both ends 8a and 8b side of the seal plate 8. The slide core 4 can be pulled out without being damaged.

  The adjustment of the movement amount of the both end portions 8a and 8b is performed so that the difference in the movement amount of the electric cylinder heads 16a and 16b does not exceed, for example, 0.5 mm. It is good also as a structure which always pulls out any one first without reversing the contraction operation speed of 16a, 16b. Further, the slide core 4 is pulled out while the contraction operation speed is reduced without stopping the pulling out operation of the end portion that has been pulled out first, while the difference in the moving amount is suppressed within the predetermined amount. It can also be configured.

  In addition, it is preferable that the predetermined amount in the difference between the movement amounts of the both end portions 8a and 8b of the seal plate 8 is set to a value that can suppress the inclination of the slide core 4 with respect to the pulling direction as much as possible. Specifically, it is 0.001-0.5 mm, for example, More preferably, it is 0.01-0.1 mm, More preferably, it is 0.02-0.08 mm.

  Further, it is preferable that the movement amount of the both end portions 8a and 8b is adjusted in the initial stage of the entire drawing process of the slide core 4. That is, in the control device 21, after the slide core 4 is pulled out by a certain amount by adjusting the movement amounts of the both end portions 8a and 8b, the synchronization of the operation of the electric cylinders 14a and 14b is released, and the both end portions 8a are released. , 8b without adjusting the moving amount, the seal plate 8 is pulled out by the electric cylinders 14a, 14b along the structure of the slide guides 17a, 17b.

  At this time, the fixed amount of pulling out the slide core 4 while adjusting the movement amount of the both end portions 8a and 8b is specifically, for example, the movement from the position of the slide core 4 immediately after the core 2 molding. The amount is more than 0 mm and not more than 10 mm, more preferably 2 to 8 mm, and particularly preferably 4 to 6 mm.

  By adopting this configuration, even if the adhesive force between the core 2 and the slide core 4 is greatest immediately after molding, it is possible to effectively suppress damage to the core 2 due to the detachment of the slide core 4. it can. In addition, after the adhesive surface between the core 2 and the slide core 4 is peeled off while adjusting the amount of movement of the both end portions 8a and 8b, the slide core 4 can be pulled out by a quick operation. The working efficiency can be improved.

  Therefore, according to the drawing method of the slide core 4 according to the present embodiment, even if the slide core 4 has a small draft and a large draft resistance by adjusting the movement amount of the both end portions 8a and 8b, The slide core 4 can be pulled out with a minimum inclination with respect to the drawing direction, and an excessive inclination of the slide core 4 is suppressed to minimize the load on the bonding surface between the core 2 and the slide core 4. The slide core 4 can be pulled out without damaging the core 2.

  Further, in the core molding apparatus 1 for molding the core 2 having a complicated structure including the slide core 4, by including the slide core advance / retreat control device 5 as the slide core withdrawal control device according to the present invention, When the slide core 4 is pulled out, the core 2 can be effectively prevented from being broken or damaged, and the productivity of the core 2 can be improved.

[Second Embodiment]
7 to 10 show a second embodiment. In the description of the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, the slide core advance / retreat control device 5 according to the present embodiment includes a center of the rear end opposite to the surface of the seal plate 8 on which the slide core 4 is fixed, that is, the pair of left and right electric cylinders 14 a. , 14b is different from the first embodiment in that a hydraulic cylinder 29 is provided in the center.

  The hydraulic cylinder 29 can be used for the insertion process or the holding process of the slide core 4 in the molding process of the core 2.

  As shown in FIGS. 7 and 8 (the electric cylinder 14b and the control device 21 on the right side are omitted in FIG. 8), the hydraulic cylinder 29 is intermediated by a hydraulic cylinder stay 30 provided at the end of the body. The plate 7 is fixedly supported. A pair of left and right connecting members 33 are fixed to the back side of the seal plate 8, and the hydraulic cylinder connecting plate 31 is held by these connecting members 33, and the output portion of the hydraulic cylinder 29 is held by the hydraulic cylinder connecting plate 31. The hydraulic cylinder head 32 connected to the (piston rod) is connected and fixed to the back side of the seal plate 8.

  On the other hand, as shown in FIG. 9, the connecting plate 31 for the hydraulic cylinder is removable (the hatched portion shows a cross section of the slide core 4, the seal plate 8 and the connecting member 33). In the case of this removal, the hydraulic cylinder head 32 is not fixed to the seal plate 8.

  Therefore, for example, when the hydraulic cylinder 29 is used in the insertion process of the slide core 4, the hydraulic cylinder head 32 is connected and fixed to the seal plate 8 using the hydraulic cylinder connection plate 31. be able to. Further, for example, when the hydraulic cylinder 29 is used for the holding process of the slide core 4, the hydraulic cylinder connecting plate 31 is removed and the hydraulic cylinder head 32 is brought into contact with the seal plate 8 as described above. can do. In the present embodiment, the hydraulic cylinder 29 is used in the process of holding the slide core 4.

(Core molding method)
In FIG. 10A, both the electric cylinders 14a and 14b and the hydraulic cylinder 29 are returned to their original positions. At this time, the operating position of the electric cylinders 14a and 14b is set to 0 point, and it is confirmed that the electric cylinders 14a and 14b have been pushed to the set error.

  Then, as shown in FIG. 10 (b), only the electric cylinders 14a and 14b are extended, the slide core 4 is advanced and inserted to the molding position of the core 2, and the extension stroke ends of the electric cylinders 14a and 14b are moved. Check. At this time, as described above, since the hydraulic cylinder connecting plate 31 has been removed, the hydraulic cylinder 29 remains in its original position.

  Next, as shown in FIG. 10C, the hydraulic cylinder 29 is extended to bring the hydraulic cylinder head 32 into contact with the seal plate 8. Thereby, the position of the slide core 4 is held by the hydraulic cylinder 29. Then, after confirming the stroke end of the hydraulic cylinder 29, the zero point of the electric cylinders 14a and 14b is reset, and the molding operation of the core 2 is performed.

  After the molding of the core 2 is completed, the hydraulic cylinder 29 is operated, the hydraulic cylinder head 32 that has been in contact with the seal plate 8 is removed, and the hydraulic cylinder 29 is returned to the original position as shown in FIG. Let Then, after confirming the contraction stroke end of the hydraulic cylinder 29, the slide core 4 is pulled out in the same manner as in the first embodiment while adjusting the positions of the electric cylinder heads 16a, 16b, and shown in FIG. The molding process is completed with the electric cylinders 14a and 14b returned to their original positions.

  For example, in the core molding apparatus 1 for molding the core 2 having a shape in which a larger number of the undercut portions 2c are connected, the length of the slide core 4 in the direction perpendicular to the drawing direction is very long. Therefore, the position of the slide core 4 is easily shifted during the molding of the core 2. Therefore, in such a core molding apparatus 1, by holding the slide core 4 using the hydraulic cylinder 29 during the molding of the core 2, the displacement of the slide core 4 during molding is suppressed, and the core 2 The yield can be improved.

  INDUSTRIAL APPLICABILITY The present invention is extremely useful because when the slide core is retracted and pulled out from a shape portion having a small draft angle, the generation of the core can be suppressed and the yield of the core can be improved.

1 Core molding device 2 Core 4 Slide core 5 Slide core advance / retreat control device (slide core pull-out control device)
8 Seal plate (plate)
8a, 8b End (part)
14a, 14b Electric cylinder (actuator)
21 Control device (control means)
29 Hydraulic cylinder

Claims (9)

A method of pulling out a slide core in a core molding device from a molded core,
The slide core is fixed on a plate;
Two parts separated in the direction orthogonal to the slide core pulling direction in the plate are moved in the pulling direction by a pair of actuators,
The slide core is pulled out by the both actuators while allowing the plate to tilt with respect to the pulling direction while adjusting the movement amount of the two parts so that a difference of a predetermined amount or more does not occur between them. A method for pulling out a slide core, characterized in that The adjustment of the movement amount of both the parts is such that when the difference in the movement amount reaches the predetermined amount, the pulling of the slide core is continued while restricting the movement of the part having the larger movement amount. The method for pulling out a slide core according to claim 1.   The slide core pulling method according to claim 1 or 2, wherein the adjustment of the movement amount of both the parts is performed at an initial stage of the entire pulling step of the slide core.   The method of pulling out a slide core according to any one of claims 1 to 3, wherein an electric cylinder is used as the actuator. An extraction control device for extracting the slide core in the core molding device from the molded core,
A plate to which the slide core is fixed;
A pair of actuators provided in the plate for moving in the pulling direction two parts separated in a direction perpendicular to the slide core pulling direction in the plate;
Control means for controlling the operation of both actuators;
A position detecting means for detecting the amount of movement in the pulling direction of both parts of the plate,
The control means adjusts the movement amount of both parts based on the movement amount of both parts detected by the position detection means so that a difference of a predetermined amount or more does not occur between the two parts. A slide core pull-out control device that controls the operation of the actuator so that the slide core is pulled out while allowing the slide core to be tilted with respect to the pull-out direction. The control means shares information about the movement amount of the two parts detected by the position detection means, and when the difference between the movement amounts reaches the predetermined amount, the movement of the part with the larger movement amount is performed. 6. The slide core pull-out control device according to claim 5, wherein the operation of the actuator is controlled so that the pull-out of the slide core is continued while restricting the movement.   7. The slide core pullout according to claim 5 or 6, wherein the control means adjusts the amount of movement of both parts by controlling the operation of the actuator at an initial stage of the entire pullout process of the slide core. Control device.   8. The slide core pull-out control device according to claim 5, wherein the actuator is an electric cylinder.   A core molding apparatus comprising the slide core pull-out control device according to any one of claims 5 to 8.

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