JPH0441042A - Sand mold for casting and pouring basin groove to sand mold for casting and device for forming molten metal flow stopping rib - Google Patents

Abstract

PURPOSE:To prevent flowing into a sprue, which is not yet poured, with molten metal and the deterioration of casting quality by shutting off between both adjoining sprues of sand mold for casting opening plural sprues on upper faces and arranging a pouring basin groove for flowing the molten metal spilled from the sprue during pouring the molten metal. CONSTITUTION:At the time of forming the pouring basin groove 8, etc., by working a working cylinder 16 for lifting, a sand cutter 32 is descended and cutters 351, 352 are bit into upper face 1a of the sand mold 1. Successively, the sand cutter 32 is shifted with a rodless cylinder 23 to form a slender groove 39. Further, the pouring basin groove 8 is formed with the cutter 352 and the molding sand loosely developed according to this formation is piled on the one end side of pouring basin groove 8. Successively, at the time of turning the rodless cylinder 23 at 18 deg. angle with a rotary actuator 29, a formed mold 33 is set above the piled molding sand. Further, by working the working cylinder 16 for lifting, the formed mold 33 is descended to form molten metal flow stopping rib 9.

Description

Detailed Description of the Invention A1 Objective of the Invention (1) Industrial Field of Application The present invention relates to a sand mold for casting, particularly a sand mold for casting having a plurality of sprues opened on the top surface, and two sprues adjacent to each other on the top surface of the sand mold. The present invention relates to a device for forming a sump groove and a sump ridge therebetween.

(2) Prior Art Conventionally, in order to improve the mass productivity of castings, a high-pressure molding method with a short molding cycle has been used as a sand mold molding method.

Using this high-pressure molding method, when a sand mold for multiple molds is formed continuously without a frame and has a vertical dividing surface, each sprue that communicates with each cavity is placed on the top surface of the sand mold, connecting the adjacent ones. You will have to approach it and open it.

(3) Problems to be Solved by the Invention When pouring one piece of metal into each sprue in the sand mold as described above, the molten metal that spills from the sprue during pouring travels along the top surface of the sprue and spills over the adjacent unpoured metal. Hot water may flow into the sprue,
If such a situation occurs, there is a risk that a hot spot etc. will occur in the casting on the side into which it is poured, and the quality thereof will deteriorate.

It is an object of the present invention to provide the above-mentioned sand mold capable of eliminating the above-mentioned problems and the above-mentioned device capable of easily obtaining means for resolving the same.

B8 Structure of the Invention (1) Means for Solving the Problems The present invention provides a casting sand mold having a plurality of sprues opened on the top surface, with the top surface blocking the two adjacent sprues so that during pouring. The first feature is that a sump groove is provided into which the molten metal spilled from the sprue flows.

A second feature of the present invention is that a hot water retaining ridge is provided on the upper surface and extends along one edge of the hot water reservoir groove.

The present invention provides a casting sand mold having a plurality of sprues opened on the upper surface, in which the upper surface blocks the two adjacent sprues so that the molten metal spilled from the sprue during pouring flows into the adjacent sprue. The third feature is that a hot water stopper ridge is provided to prevent this from happening.

The present invention provides a sump groove on the upper surface of a casting sand mold having a plurality of sprues opened, which blocks the two adjacent sprues and allows the molten metal spilled from the sprues during pouring to flow into it, and the sump. A device for forming a hot water stop along one side edge of the groove, the device comprising a support member that is disposed above the upper surface of the sand mold and is movable up and down, and an axis parallel to the longitudinal direction of the hot water reservoir groove on the support member. a first driving source having a main body rotatably supported around the periphery and a movable member provided on the main body so as to be able to reciprocate in the axial direction; and a second driving source that intermittently rotates the first driving source about the axial direction.
a drive source, and a drive source provided on the movable member to form the sump groove on the upper surface of the sand mold and to deposit molding sand produced by the formation of the sump groove along one side edge of the sump groove. a sand cutter for raising the mold, and a mold that is provided on the main body of the first drive source so as to be out of phase with the sand cutter, and that molds the hot water stopper by pressing the molding sand. The fourth feature is that

(2) Effect According to the first feature, the molten metal spilled from the sprue during pouring is
Molten metal will not flow into the unfilled sprue located next to it.

According to the second feature, the inflow of the molten metal can be prevented more reliably. However, pouring work in this case is performed by moving the ladle from the side of the sump groove where there is no stopping ridge to the side where there is a stopping ridge.

According to the third feature, it is possible to obtain the effect of preventing the inflow of molten metal in the same manner as described above. In this case, the ladle is moved in the same manner as described above.

According to the fourth feature, the hot water reservoir groove and the hot water stopping ridge can be efficiently formed on the upper surface of the sand mold.

(3) Embodiment In FIGS. 1 to 3, the casting sand mold 1 used for mass counting is constructed without a frame by arranging a plurality of unit molds 2 of the same shape in a line so as to be in close contact with each other. Each unit mold 2 is continuously molded using a high-pressure molding method.
Both adjacent unit molds 2 have vertical dividing surfaces 3 and 4 facing each other, and a product molding cavity 5 is formed between the vertical dividing surfaces 3 and 4.
A runner 6 communicating with the upper part of the cavity 5, and a hot water lower communicating with the runner 6 and opening on the upper surface 1a of the sand mold 1 are formed. The hot water lowers are arranged so that adjacent ones are close to each other.

A sump groove 8 formed on the upper surface 1a of the sand mold 1 to block the two adjacent hot lowers, and one side edge of the in-situ sump groove 8;
In the illustrated example, a hot water stopper ridge 9 is provided extending along the right side edge.

During the pouring operation, move the ladle 10 from the left side to the right side in the figure so that it goes from the side of the sump groove 8 where there is no stopper ridge 9 to the side where there is a stopper ridge 9. Pour one piece into each hot water lower.

During this pouring, the molten metal m may spill from the hot water lower, and the spilled molten metal may travel along the upper surface 1a and head toward the unfilled hot water lower on the right side of Fig. 1, but in this case, The spilled molten metal m flows into the sump groove 8 and is received therein, and overflow from the sump groove 8 is prevented by the stopper ridge 9.

As a result, it is possible to eliminate the problem that the molten metal m spilled from the molten metal lower that is being poured flows into the unfilled molten metal lower that is located to the right of the molten metal lower.

Next, a method for forming the sump groove 8 and the sump ridge 9 in the sand mold 1 will be described.

FIG. 4 shows the apparatus used to carry out this method, which apparatus is constructed as follows.

That is, above the upper surface 1a of the sand mold 1, a pair of guide rods 11 extending in the arrangement direction of the hot water lowers, in the illustrated example, in a direction perpendicular to the plane of the paper, are installed on a machine frame (not shown). A support plate 12 is slidably suspended from both guide rods 11 via a pair of guide cylinders 13, and a piston rod 15 of a horizontal movement actuating cylinder 14 that slides the support plate 12 is connected to the support plate 12. Ru.

A display operating cylinder 16 is erected at the center of the upper surface of the support plate 12 with its axis directed in the vertical direction, and its piston rod 17 extends below the support plate 12. A support frame 18 is attached to the lower end of the piston rod 17 as a support member that extends in a direction perpendicular to the arrangement direction of the hot water lowers, that is, in the longitudinal direction of the hot water reservoir groove 8, and a pair of guides are erected on the upper surface of the support frame 18. The rod 19 is slidably fitted into the pair of guide tubes 20 of the support plate 12. As a result, the support frame 18
can be raised and lowered freely.

The support frame 18 has a pair of hanging parts 21 near one end and the other end.
．． 22, and between these hanging parts 21 and 22, a cylinder body (main body) 24 of a rodless cylinder 23 as a first driving source is rotatably supported via support shafts 25 and 26 located at both ends thereof. . Thereby, the cylinder body 24 is rotatable around the axis XX parallel to the longitudinal direction of the sump groove 8 . The cylinder body 24 is slidably provided with a piston 27 as a movable member that reciprocates in the direction of the axis XX.

The support frame 18 further has one hanging part 28 at the other end, and the hanging part 28 is provided with a rotary actuator 29 as a second drive source, and the drive shaft 30 of the rotary actuator 29 connects a coupling 31. It is connected to one support shaft 26 of the cylinder body 24 through the cylinder body 24 . Thereby, the rodless cylinder 23 can be intermittently rotated around the axis XX.

A sand cutter 32 is attached to the piston 27 of the rodless cylinder 23, and a mold 33 is attached to the cylinder body 24 with a phase shift of about 90@ from the sand cutter 32.

The sand cutter 32 functions to form a sump groove 8 on the upper surface 1a of the sand mold 1 and to heave up the foundry sand produced by the formation of the sump groove 8 along one side edge of the sump groove 8.

Fifth. As shown in FIG. 6, the sand cutter 32 is attached to the mounting board 34 and its lower surface, with a first cank 35 located on the front side in the sump groove forming direction a and a second cank 35 located on the rear side in the sump groove forming direction a. Cutter 35. As a result, the mounting board 34 is attached to the piston 27 of the rodless cylinder 23.

1st canta 35. is knife-shaped, and has arcuate double edges 36 from its lower edge to its front edge in the sump groove forming direction a.

The second canter 35□ has a flat plate shape, and has double blades 37 on its lower edge that are inclined upward from the rear end in the sump groove forming direction a to the front end C in the same direction a. sand mold 1
The second cutter 35□ can bite into it better. Further, the second cut 35□ is parallel to the sump groove forming direction a and is inclined with respect to the straight line d that divides the first cut 35 into three equal parts. Uchi, the rear end of the double blade 37 in the direction a of forming the sump groove is located substantially on the straight line d, and the front end C of the double blade 37 in the direction a of forming the sump groove.
is located away from straight line d. Thereby, the foundry sand produced by forming the sump groove 8 can be piled up along one side edge of the sump groove 8.

The mold 33 is used to mold the stopper ridge 9 by pressing the foundry sand, and has a cavity 38 that opens outward.

Before the formation of the sump groove 8 and the stop ridge 9, the horizontal motion actuation cylinder 14, the display actuation cylinder 16, the rodless cylinder 23, and the low reactor 29
As a result of the operation, the sand cutter 32 is placed above one end of the upper surface 1a of the sand mold 1 between the two adjacent warm lowers of the sand mold 1, as shown by the solid line in FIG. Further, the mold 33 is located at an upper position with its cavity 38 facing the road.

When forming the sump groove 8, etc., the sand cutter 32 is lowered by the operation of the lifting cylinder 16, and the first and second cutters 35. ．． 35□ into the upper surface 1a of the sand mold 1. In this case, the first cutter 35. The biting depth e, is set to approximately the length of the cutting edge portion as shown in Fig. 5,
Further, the biting depth C2 of the second cutter 35z is set to such an extent that approximately half of the double-edged blade 37 is buried, as shown in FIG.

Next, the rodless cylinder 23 is operated to move the sand cutter 32 toward the other end of the upper surface 1a of the sand mold l as shown by the chain line in FIG. With this movement, the first cutter 35
．． As a result, a narrow groove 39 is formed as shown in FIG. 7(a), and the molding sand f generated as a result of the formation is removed to both sides of the narrow groove 39. Also, by using the second cutter 35□,
), a sump groove 8 is formed, and the molding sand f generated as a result of its formation is piled up along one side edge of the sump groove 8. In this sump groove 8, the first and second cutters 35. ．． A short portion corresponding to the distance between the grooves 35□ is formed by the digging action of the second cutter 35z on the flat upper surface 1a, but most of the other part is formed by the expanding action of the second cutter 35□ on the narrow groove 39. It is formed. By applying such an expansion action, the sump groove 8 can be formed while breaking the hard upper surface 1a of the sand mold 1 into small fragments.

After forming the sump groove 8, the lifting operation cylinder 16 and the rodless cylinder 23 are operated to remove the sand canter 3.
2 to the initial position, and then the rodless cylinder 23 is moved approximately 1 by the actuation of the row reactuator 29.
Rotate 80 degrees.

As a result, the mold 33 is placed above the heaped-up molding sand f, so the mold 33 is lowered by the operation of the lifting actuation cylinder 16 and presses the molding sand f as shown in FIG. 7(C). By doing so, the hot water stopper ridge 9 is formed.

After forming the hot water retaining ridge 9, the mold 33 is returned to its original position by operating the lifting cylinder 16 and the rotary actuator 29.

After one molten metal sump groove 8 and one molten metal stopper 9 are formed in this way, the sand cutter 32 and the like are moved between the next two sprues 1 by the operation of the horizontal movement cylinder 14.

The positioning of the sand cutter 32 and the like is determined by detecting the forward position during plunging in the high pressure molding machine and integrating the stroke amount of the plunger after a predetermined number of shots (number of unit molds). Thereby, it is possible to always accurately position the sand cutter 32 and the like in response to changes in the sand mold accompanying changes in the shape of the casting.

In addition, a hot water reservoir groove 8 and a hot water stopping ridge 9 are formed on the upper surface 1a of the sand mold 1.
Only one of the two may be provided.

Effects of the C0 Invention According to the inventions described in claims (1) to (3), it is possible to ensure that molten metal spilled from a sprue during pouring flows into a sprue that is not yet poured on that floor. Thus, it is possible to provide a casting sand mold that can avoid deterioration in casting quality due to the inflow of molten metal.

According to the invention as set forth in claim (4), it is possible to provide a forming device that can efficiently form the molten metal sump groove and the molten stopper ridge that exhibit the molten metal flow prevention effect on the upper surface of a sand mold for casting. can.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the casting sand mold according to the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a plan view, FIG. 3 is a cross-sectional view along the line Figure 4 is a front view showing the relationship between the forming device and the sand mold seen from the direction of the arrow in Figure 3, and Figure 5. Figure 6 shows the sand cutter, Figure 5 is the front view, Figure 6 is Figure 5 -
(2) Line sectional views and FIGS. 7(a) to 7(C) are explanatory diagrams of the process of forming the sump groove and the sump ridge. f... Foundry sand, m... Molten metal, x-X... Axis line, 1
...Sand mold for casting, 1a...Top surface, 7...Gate, 8
... Hot water reservoir groove, 9... Hot water stopping ridge, 18... Support frame (supporting member), 23... Rodless cylinder (first drive source), 24... Cylinder body (main body), 27...
Piston (movable member), 29... Low reactuator (second drive fi), 32... Sand cutter, 33
...Molding mold patent applicant Asama Giken Kogyo Co., Ltd.

Claims (4)

[Claims] (1) In a casting sand mold in which a plurality of sprues (7) are opened on the upper surface (1a), the upper surface (1a) is provided with a block between adjacent sprues (7), and the sprue is placed in the mold during pouring. (7) A sand mold for casting, characterized in that a sump groove (8) is provided into which the molten metal (m) spilled from the mold flows into. (2) The casting sand mold according to item (1), wherein the upper surface (1a) is provided with a stopper ridge (9) extending along one side edge of the sump groove (8). (3) In a casting sand mold in which a plurality of sprues (7) are opened on the upper surface (1a), the upper surface (1a) is provided with a block between the two adjacent sprues (7), and the sprue during pouring. (7) A sand mold for casting, characterized in that a stopper ridge (9) is provided to prevent the molten metal (m) spilled from flowing into the adjacent sprue (7). (4) Casting sand mold (1) with multiple sprues (7) opened
On the upper surface (1a) of
A device for forming a sump groove (8) into which the molten metal (m) spilled from the sprue (7) during pouring flows in, and a stopper ridge (9) along one side edge of the sump groove (8). A support member (18) that is disposed above the upper surface (1a) of the sand mold (1) and can be raised and lowered, and a support member (18) that extends parallel to the longitudinal direction of the sump groove (8). A first device having a main body (24) rotatably supported around an axis (X-X) and a movable member (27) provided on the main body (24) so as to be reciprocating in the direction of the axis (X-X). A driving source (23) and its first
A second drive source (29) that intermittently rotates the drive source (23) about the axis (X-X), and a second drive source (29) that is provided on the movable member (27) and is provided on the upper surface (1a) of the sand mold (1). a sand cutter (28) that forms a sump groove (8) and heaps foundry sand (f) generated by the formation of the sump groove (8) along one side edge of the sump groove (8); The main body (24) of the first drive source (23) is provided so as to be out of phase with the sand cutter (32), and the molding sand (f) is pressed to form the stopper ridge ( 9)
A mold for forming a sump groove and a sump ridge for a casting sand mold, the device comprising: a mold for forming a sump groove and a sump ridge for a casting sand mold.