JPS6356017B2 - - Google Patents

Description

[Detailed description of the invention] A. Object of the invention (1) Industrial field of application The present invention relates to a core molding machine, particularly a core molding machine which has a partially narrowed part and which embeds both ends of a flat cylindrical part in the narrowed part. The present invention relates to a support mounting structure for a core molding machine having an upper mold and a lower mold that can move up and down relative to each other and cooperate with each other to mold a cylindrical core.

(2) Prior art A core molding machine of the above type in which a burr is set in the lower mold is conventionally known (see Japanese Patent Application Laid-Open No. 57-168748 and Japanese Utility Model Application No. 55-103040). ).

(3) Problems to be solved by the invention In the above-mentioned conventional method, the keren was set in the lower mold, so after the molding of the core was completed,
When the upper and lower molds are separated, the molded core left in the lower mold must be removed from the lower mold before a new keren can be set on the same lower mold. Since the step of taking out the core and the step of setting a new core on the lower mold cannot be carried out in parallel, there is a drawback that the working time required for molding each core becomes longer.

SUMMARY OF THE INVENTION An object of the present invention is to provide a burr mounting structure for the core molding machine, which can eliminate the above-mentioned drawbacks of the conventional ones and also allows the burr setting work to be performed simply and easily. .

B. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a mounting with an open lower side in which a keren can be inserted and removed from the lower part of the upper mold. Along with forming a groove,
The present invention is characterized in that a spring is supported which can press against the keratin inserted into the mounting groove and prevent the keratin from falling naturally from the mounting groove.

(2) Effect According to the above configuration, when setting the keren in the core molding machine, the keren can be simply pushed into the mounting groove of the upper mold from below against the elastic force of the spring. good. In addition, when separating the upper mold from the lower mold after the core molding is completed, the core is left behind in the lower mold, so the keren integrated with the core is attached against the elastic force of the spring mentioned above. It can be automatically extracted from the groove. Moreover, in the separated state of the lower mold, the step of taking out the molded core left in the lower mold from the lower mold and the step of setting a new keren in the upper mold can be performed in parallel.

(3) Embodiment An embodiment of the present invention will be explained below with reference to the drawings. First, in FIG.
is for molding, for example, a water jacket core for a four-cylinder cylinder block, and a fixed frame 2 configured in a gate shape has a rail 3 extending in a direction perpendicular to the plane of the paper in FIG. A lower die 5 is mounted on a trolley 4 that is movable on the rails 3. An upper mold 6, which is removably joined to the lower mold 5 and is used to mold the core in cooperation with the lower mold 5, is suspended from the upper part of the frame 2 via a cylinder 7 so as to be movable up and down. Supported. Further, a grip plate 8 for gripping the upper mold 6 and a mold release plate 9 for releasing the mold are respectively disposed between the upper mold 6 and the cylinder 7.

The frame 2 includes a setting device 11 that can set a keren 23 from below in the upper mold 6 while the lower mold 5 is moved horizontally apart from a position directly below the upper mold 6 along the rail 3; A supply device 10 capable of supplying keren 23 to the device 11 is supported.

In FIGS. 2, 3, and 4, the supply device 10 is provided on a horizontal substrate 12 fixed to a frame 2, and has three parts for holding a large number of flat cylindrical plates 23 in a stacked manner. magazine racks 14a, 14b, 14c, and each magazine rack 1
4a, 14b, 14c, and an extrusion/rotation mechanism _P1 capable of extruding flat cylindrical parts one by one and turning them by a predetermined angle; It is composed of a pushing mechanism _P2 that can be pushed. The extrusion rotation mechanism _P1 includes magazine racks 14a, 1
Three extrusion plates 15a, 15b, 15c for extruding one piece of keren in 4b, 14c, and a single extrusion cylinder 17 for reciprocating them.
and a 90 degree rotation mechanism 1 that rotates the keren 23 pushed out by the extrusion plates 15a, 15b, and 15c by 90 degrees.
3a, 13b, 13c, and the pushing mechanism _P2 includes 90 degree rotation mechanisms 13a, 13b,
Three pushing plates 16a, 16 for pushing downward the keren 23 rotated by 13c.
b, 16c, and a single push cylinder 18 for driving them up and down.

The 90 degree rotation mechanisms 13a, 13b, 13c are
A pair of guide blocks 19 and 20 are disposed at the edge of the substrate 12 on the upper die 6 side with a space between them, and are arranged to face each other. One guide block 19 has a vertical guide surface 21 on the other guide block 20 side.
A recess 22 facing the guide surface 21 is provided. This recess 22 is a flat cylindrical part 2 in a horizontal position.
3 is provided with a depth sufficient to allow rotation by 90 degrees to take a vertical position. Further, a permanent magnet 24 is embedded in the guide surface 21 in order to rotate the flat cylindrical part 23 by 90 degrees. Between the upper parts of both guide blocks 19 and 20, each pushing plate 16 is provided.
A, 16b, 16c are provided with a slit 25 through which the guide blocks 19, 16c can be inserted, and the lower portions of both guide blocks 19, 20 extend downward through the substrate 12 and face each other to form an outlet 26 of a flat cylindrical groove 23. do.

Above the 90 degree rotation mechanism 13b, there are columns 27, 2.
A bracket 29 is disposed supported on the base plate 12 at 8, and the pushing cylinder 18 having a vertical axis is fixed and supported on this bracket 29. The piston rod 3 of this pushing cylinder 18
0 is vertically movable through the bracket 29, and a connecting plate 31 having bent ends is fixed to its lower end. Each pushing plate 16a, 16b, 16c is
A connecting rod 32 passing through both ends of the connecting plate 31 is fixed to both ends and the center thereof, and the expansion and contraction of the pushing cylinder 18 causes each pushing plate 16a,
16b and 16c are 90 degree rotation mechanisms 13a and 13, respectively.
It is inserted into and removed from the slits 25 of b and 13c. In addition, a rotation prevention rod 33 is fixed to the connecting plate 31 and extends upwardly through the bracket 29 in a movable manner.
6c is prevented from rotating about the axis of the piston rod 30. Therefore, in response to the extension operation of the pushing cylinder 18, each pushing plate 16a,
16b, 16c are always inserted through the slit 25 into the respective 90 degree turning mechanisms 13a, 13b, 13c.

With reference to FIG. 5 and FIG. 6, each of the above 90
Magazine holding mechanisms 34a, 34b, 34c are provided on the substrate 12 on the opposite side of the upper die 6 with respect to the rotating mechanisms 13a, 13b, 13c, and these magazine holding mechanisms 34a, 34b, 34c
The magazine racks 14a, 14b, and 14c are removably held therein.

Each magazine holding mechanism 34a, 34b, 34c
The first block 35 has a vertical flat plate shape, and the second block 3 is screwed to the bottom of the first block 35.
6, a third block 37 that is attracted to the second block 36 by magnetic force, and the first and third blocks 3
5 and 37, and a holder 38 having a substantially L-shaped cross section. The first block 35 is fixed on the substrate 12, and the second block 36 is fixed to the first block 35 by forming an upwardly open fitting groove 39 between the first block 35 and the first block 35. Further, a permanent magnet 40 is embedded in the third block 37, and when the third block 37 is attracted to the second block 36 by its magnetic force, the second block 36
A guide groove 41 that is open upward is formed between the third block 37 and the third block 37 . Furthermore, the first block 35
Step portions 42 and 43 facing upward are provided on the inner surface of the third block 37 and on the inner surface of the third block 37.

Each magazine holding mechanism 34a, 34 like this
At b and 34c, the holder 38 is inserted between the first and third blocks 35 and 37 with its lower end supported by the steps 42 and 43. Also,
Each magazine rack 14a, 14b, 14c is formed into a rectangular cylindrical shape with an open lower end, and is inserted into the holder 38 with the lower end fitted into a fitting groove 39 and supported by a stepped portion 43. . With each magazine rack 14a, 14b, 14c inserted and held in the magazine holding mechanism 34a, 34b, 34c in this manner, the flat cylindrical support 23 at the bottom layer is inserted into the second block 36 and the push rods 47a, 47b, 47.
placed on c. Also, the magazine rack 14a,
14b, 14c and the holder 38, the third block 37 is attracted to the second block 36 by the magnetic force of the permanent magnet 40, so it is extremely difficult to remove the third block 37 from the second block 36. Easy and therefore magazine rack 1
4a, 14b, 14c and the holder 38 can be inserted and removed very easily.

On the substrate 12, a bracket 44 is fixed at the center of the edge farthest from the upper die 6.
The extrusion cylinder 17 having a horizontal axis is fixed and supported on this bracket 44. A connecting plate 46 is fixed to the piston rod 45 of the extrusion cylinder 17 that movably passes through the bracket 44, and a connecting plate 46 has a connecting plate 46 that slides in the guide groove 41 of each magazine holding mechanism 34a, 34b, 34c. Moving extrusion rods 47a, 47b, 47c are fixed respectively, and each extrusion rod 47a, 47b, 47
Extrusion plates 15a, 15b, and 15c are fixed to the upper part of c, respectively. Moreover, the extrusion plates 15a, 15
b, 15c are provided from the middle of the push rods 47a, 47b, 47c to the connecting plate 46, and depending on the expansion and contraction movement of the push cylinder 17, the ends of the push rods 47a, 47b, 47c are provided at the end of each magazine holding mechanism 34a, 34b, 34c. Mechanism 13 for rotating the lower flat cylindrical part 23 by 90 degrees
a, 13b, 13c, and each magazine holding mechanism 34a, 3 as shown in FIG.
4b, 34c to the position where it escaped to the extrusion cylinder 17 side.

Referring to FIGS. 7 and 8 together, the setting device 11 includes a frame 2 below the feeding device
holding grooves 65 and 66 as holding portions that are supported by and capable of receiving the keren 23 from above in a removable manner.
Three holder holders 48a, 48b, 48 with
c, a horizontal movement mechanism _D1 that can horizontally move these to a position directly below the upper mold 6, the holder 48a,
An elevating mechanism D ₂ is provided which can raise the holders 48 a, 48 b, 48 c in order to push the burrs 23 on the holders 48 b, 48 c into mounting grooves 70 a, 70 b, 70 c, which will be described later, of the upper mold 6.

A bracket 51 is fixed to the frame 2, and a horizontally moving cylinder 49 is fixed and supported on this bracket 51. The horizontally moving cylinder 49 has a horizontal axis parallel to the extrusion cylinder 17 in the feeding device 10 and is fixed to a bracket 51, and a horizontally moving bracket 53 is attached to a piston rod 52 that movably passes through the bracket 51. is fixed. The bracket 51 also has a piston rod 52 and three horizontal guide tubes 5.
4 is penetrated and fixed, and their guide cylinder 54
A guide bar 55 fixed to a horizontal movement bracket 53 is inserted through each of the holes. Therefore,
In response to the expansion and contraction of the horizontal movement cylinder 49, the horizontal movement bracket 53 is reciprocated in the horizontal direction by sliding of the guide bar 55 within the guide cylinder 54, and each guide bar 55 and the guide cylinder 54 move the horizontal movement bracket 53 back and forth in the horizontal direction. Rotation of the piston rod 52 about its axis is prevented. The cylinder 49, the bracket 53,
The guide tube 54 and the guide bar 55 constitute the horizontal movement mechanism _D1 .

The horizontal movement bracket 53 includes a bracket 5.
6 is fixed at a right angle, and this bracket 56
A lifting cylinder 50 having a vertical axis is fixed and supported. A piston rod 57 of the lifting cylinder 50 movably passes through the bracket 56 and extends upward, and a lifting bracket 58 is fixed to the upper end of the piston rod 57. Further, three guide bars 59 extending downward are fixed to the lifting bracket 58, and these guide bars 59 are respectively inserted into three guide tubes 60 provided vertically through the bracket 56. Therefore, by telescopically operating the lifting cylinder 50, the lifting bracket 58 moves up and down while sliding the guide bar 59 within the guide tube 60, and each guide bar 59 and guide tube 60 moves the piston rod 57. Rotation about the axis is prevented. Therefore, the cylinder 50 and the bracket 5
8, the guide bar 59 and the guide tube 60 constitute the elevating mechanism _D2 .

A cleaning support 61 is fixed to the lifting bracket 58, and cleaning support holders 48a, 48b, and 48c are arranged on this cleaning support 61.
A mounting surface 62 is provided at the upper end of each holder 48a, 48b, 48c, and this mounting surface 6
Holding frame 6 erected facing each other at both ends of 2
3 and 64 are provided with a holding groove 6 extending vertically.
5 and 66 are provided, respectively. Each holding groove 65,
66 is drilled with a width that allows both ends of the flat cylindrical support 23 in a vertical position to fit thereinto.

In FIG. 9, each holder 48a, 48
b, 48c are held by a frame 67 provided on the cleaning holder 61 with slight vertical movement allowed, and are biased upward by a spring 68.

In FIG. 10, the upper die 6 to which each flat cylindrical shell 23 is attached has a protrusion 69 that corresponds to the hollow part of the water jacket core for a 4-cylinder cylinder block, and a protrusion 69 is provided between each cylinder. Mounting grooves 70a, 70b, and 70c that are open downward are provided in portions of the core corresponding to the narrow portions, respectively. Moreover, a recess 71 is provided in one side wall of each of the mounting grooves 70a, 70b, and 70c, as shown in FIG. A leaf spring 73 is held. This plate spring 73 is inserted into each mounting groove 70a, 70b, 70c from a hole 74 in the center of the pressing plate 72.
When the flat cylindrical groove 23 is inserted into the mounting groove 70a, 70b, 70c,
The keratin 23 is elastically pressed against the other side wall to prevent the keratin 23 from falling naturally from the grooves 70a, 70b, and 70c. However, the spring force of each leaf spring 73 is such that when a slight force is applied to the flat cylindrical embossment 23 and the upper die 6 is moved up and down, the mounting grooves 70a, 70b, 70c of the flat cylindrical embossment 23 are
The setting is set to a degree that allows escape from.

Again, in FIG. 1, an operation panel 75 is disposed hanging laterally from the upper part of the frame 2.
By operating this operation panel 75, the operation of each operating section is controlled.

Next, the operation of this embodiment will be explained. When the cart 4 carrying the lower die 5 moves horizontally along the rail 3 to a position directly below the upper die 6 and comes to rest,
The upper mold 6, which has already installed the flat cylindrical grooves 23 in each of the mounting grooves 70a, 70b, and 70c, descends and the lower mold 5
By the cooperation of both molds 5 and 6, a core having a flat cylindrical groove 23 is molded. After this molding is completed, when the upper mold 6 rises and separates from the lower mold 5, the molded core is left behind in the lower mold 5 due to its own weight.

Thereafter, by moving the trolley 4, the lower mold 5 is moved horizontally away from the position directly below the upper mold 6 along the rail 3, and there, the molded core is removed from the lower mold 5 by a take-out device (not shown). is taken out. While the ejecting device is in operation, a new keren 23 is attached to the upper die 6 as will be described in detail below.

That is, in the supply device 10, the extrusion cylinder 17 is operated to extend, and each magazine rack 34 is
The lowest layer of the flat cylindrical plates 23 stacked horizontally in a, 34b, and 34c is pushed out into the 90 degree rotation mechanisms 13a, 13b, and 13c by the extrusion plates 15a, 15b, and 15c. . At this time, the flat cylindrical part 23 is pushed into the 90 degree rotation mechanism 13a, 13b, 13c in a horizontal position, but when the push-out plates 15a, 15b, 15c are retreated, it is attracted to the permanent magnet 24 due to the difference in surface area, 90 degrees
It is held on the guide surface 21 in a state in which it has been rotated a degree and assumed a vertical posture.

Next, the pushing cylinder 18 is extended and the pushing plates 16a, 16b, 16c are removed from the slit 25.
Each flat cylindrical part 23 is pushed into the 90 degree turning mechanism 13a, 13b, 13c and along each guide surface 21.
Press down. As a result, each flat cylindrical part 23
falls downward from the outlet 26, but at this time, each holder 48a, 48 in the setting device 11
b, 48c are corresponding 90 degree rotation mechanisms 13a, 13
It is located below the outlet 26 of the holes 48a, 13c, and the flat cylindrical support 23 that has fallen is fitted into the holding grooves 65, 66 of the support holders 48a, 48b, 48c and held in a vertical position.

In this state, the horizontal movement cylinder 49 is extended and the cleaning holder 61 is horizontally moved to just below the upper mold 6, and each cleaning holder 48a, 48b, 48c is located directly below the mounting groove 70a, 70b, 70c. Next, the elevating cylinder 50 starts to extend, and the cleaning holder 61 and each cleaning holder 48
a, 48b, 48c rise, and the holder 48
Each flat cylindrical part 23 on a, 48b, 48c
are inserted into the mounting grooves 70a, 70b, 70c with both ends protruding outward, and the holder 48
Mounting groove 70 according to the descent of a, 48b, 48c
a, 70b, and 70c, respectively.

The flat cylindrical dents 23 are held in the mounting grooves 70a, 70b, 70c of the upper die 6, respectively, and the holder holders 48a, 48 are held by the action of the cylinder 49.
At the stage when b and 48c have returned, and when the lower die 5 together with the cart 4 has returned to a position directly below the upper die 6 and is stationary, the upper die 6 starts to descend again. As a result, the upper mold 6 and the lower mold 5 cooperate to mold the core, but at this time, both ends of the flat cylindrical keren 23 are buried in the narrow part of the core, and the upper mold 6 rises. Accordingly, the flat cylindrical part 23 remains inside the core.

The core formed in this way forms a water jacket when casting a four-cylinder cylinder block, and the flat cylindrical groove 23 functions to prevent deformation of the narrow part between each cylinder, and also to prevent the inside of the cylinder block from deforming. The water jacket formed around each cylinder is integrally cast into the cylinder to form a water passage that connects the cylinders to each other.

As is clear from the operation of the above embodiment,
After the molding of the core is completed, the molded core remaining in the lower mold 5 is taken out from the lower mold 5, and the upper mold 6 is removed.
Since the process of setting a new keren 23 is carried out in parallel with each other, there is no need to set extra work time for setting the keren 23, and therefore the work time required for molding each core can be reduced. Can be shortened.

C. Effects of the Invention As described above, according to the present invention, the upper mold is formed with a mounting groove which is open at the lower side and into which the keratin can be inserted and removed from below, and the mounting groove is formed in the upper mold. Since a spring is supported that can press against the inserted keren and prevent it from falling naturally from the mounting groove of the upper mold, when setting the keren in the core molding machine, place the keren in the upper mold's mounting groove. It is sufficient to simply press the spring against the elastic force of the spring from below, and when separating the upper mold from the lower mold after the core molding is completed, the upper mold is integrated with the core remaining in the lower mold. The shavings that have been removed can be automatically extracted from the mounting groove of the upper mold, and therefore the operation of attaching and removing the shavings to and from the upper mold is extremely simple, contributing to improved work efficiency. Furthermore, when the upper mold is separated from the lower mold after the molding of the core is completed, there are two steps: taking out the molded core remaining in the lower mold from the lower mold, and setting a new keren on the upper mold. Since these steps can be carried out in parallel, the working time required to mold each core can be significantly reduced compared to when these steps are carried out sequentially.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall partially cutaway front view, FIG. 2 is an enlarged perspective view of the feeding device, and FIG. 3 is an enlarged plan view of the feeding device.
Figure 4 is a sectional view taken along the - line in Figure 3, and Figure 5 is a cross-sectional view of Figure 3.
Figure 6 is a cross-sectional view taken along the line - in Figure 3, Figure 7 is an enlarged perspective view of the setting device, Figure 8 is a sectional view taken along the line -
The figure is an enlarged side view of the setting device, Fig. 9 is an enlarged sectional view taken along the line of Fig. 8, Fig. 10 is a perspective view showing how the flat cylindrical keren is set in the upper mold, and Fig. 11 is the structure of the mounting groove. FIG. 1... Core molding machine, 5... Lower mold, 6... Upper mold,
23...Flat cylindrical keren, 70a, 70b, 70
c... Mounting groove, 73... Leaf spring.

Claims (1)

[Claims] 1. A core equipped with an upper mold and a lower mold that can be raised and lowered relative to each other to form a cylindrical core that has a partially narrowed part and has both ends of a flat cylindrical part buried in the narrowed part. In the molding machine, the upper mold includes:
Forming a mounting groove with an open lower side into which the keratin can be removably inserted from below,
A mounting structure for a keratin in a core molding machine, characterized by supporting a spring that can press against the keratin inserted into the mounting groove and prevent the keratin from falling naturally from the mounting groove.