JPS5852739B2 - Molding gas vent hole drilling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drilling machine for making gas vent holes in a mold (upper mold) formed by a mold making machine in a mold making line while the mold is being transported to a mold matching process. .

In order to prevent the adverse effects of gas generated during pouring, rotary drilling using a rotary drill or punching using a punch are known as means for forming an appropriate number of gas vent holes in the mold. ing.

The former type of rotary drilling method has the advantage of less sand falling (crumbling) and a lower mold breakage rate, but on the other hand, the time required to drill the hole is longer and the speed of the mold production speed, that is, the speed of the mold conveyance line, is increased. The problem is that it cannot be handled.

On the other hand, in the case of the latter punching method, although the time required for drilling the hole can be shortened, there is a lot of sand falling (crumbling) during punching, which damages the strength of the mold, and sometimes the sand falls even into the mold cavity, causing the mold to be molded. There is a problem in that it may cause damage.

In view of the above-mentioned problems, an object of the present invention is to provide a punching-type drilling method that allows the work to be performed without causing sand drop.
The object of the present invention is to provide a drilling machine for molds that can be carried out.

Embodiments of the present invention will be specifically described below based on the drawings.

As shown in the figure, a rectangular frame shape larger than the flask 10 is mounted on the upper part of a frame 2 which is erected on both sides of the roller conveyor 1 so as to straddle the mold conveyance line intercepted by the roller conveyor 1. A fixed pedestal 3 formed in the form of (hereinafter referred to as the front-back direction) and in a direction perpendicular to the mold conveyance line direction (hereinafter referred to as the left-right direction).

At the front and rear inner lower portions of the movable pedestal 4, positioning holes 6a are provided at the lower ends of the movable frame 4 so as to correspond to a pair of knock pins 11 with tapered tips formed on the upper part of the flask 10 of the mold 9. A locator 6 is provided.

Thus, the positioning locator 6 is supported so as to be movable up and down by the rond holder 7 fixed to the movable pedestal 4, and can also be moved up and down by the positioning air cylinder 8 supported by the movable pedestal 4. Before drilling with a drill, the movable pedestal 4 is positioned at a fixed relative position with respect to the mold 9 to be drilled.

Note that the movable pedestal 4 is always positioned slightly to the rear and to the right of its original position by a spring 12 stretched in the front-rear direction and a spring 12 stretched in the left-right direction between the fixed pedestal 3 and the movable pedestal 4. held in position.

Further, a first movable table 13 is mounted on the movable pedestal 4 so as to be movable in the front-back direction, and a second movable table 22 is mounted on the first movable table 13 so as to be movable in the left-right direction.

The first movable table 13 is formed in the shape of a rectangular frame that is elongated in the left-right direction, and the guide rail 1 that extends in the front-rear direction has both left and right ends fixed to the left and right upper surfaces of the movable pedestal 4.
4, and is moved back and forth via a ball screw 15.

That is, the ball screw 15 is fixed to the rear central part of the movable table 13 so as to extend horizontally toward the rear, and the nut 17 is rotatably housed in a nut holder 16 fixed on the movable frame 4. It is screwed together with
It is moved forward and backward by forward and reverse rotation of the nut 17.

Note that the nut 17 is rotated via a belt transmission device 20 by a stepping motor 19 which is attached to a bracket 18 fixed on the movable frame 4 and is capable of forward and reverse rotation.

Further, the ball screw 15 passes through the driven pulley of the belt transmission device 20 and the bracket 1B.

On the other hand, the second movable table 22 is
3 and is slidably attached to two guide bars 23 horizontally fixed to the upper part of the first movable table 13 in parallel in the left-right direction.

A nut 24 attached to the bottom surface of the second movable table 22
is screwed into a ball screw 25 which is horizontally suspended parallel to the guide bar 23 and rotatably supported on the first movable table 13, and by forward and reverse rotation of the ball screw 25, the second
The movable table 22 can be moved left and right.

Note that the ball screw 25 is rotated via a belt transmission device 27 from a stepping motor 26 which is attached to a bracket 46 fixed to the first movable table 13 and is capable of forward and reverse rotation.

Furthermore, the second movable table 22 is equipped with two punch devices 28 in this embodiment.

The second movable table 22 is formed with a front-open skirt portion 29 that hangs down through the first movable table 13, the movable pedestal 4, and the fixed pedestal 3, and the punch device 2
The punch holders 31 of the punch 30 at No. 8 are slidably attached to two guide rods 32 that are attached to the skirt portion 29 vertically and parallel to each other, and each punch holder 31 2. The punch is moved up and down by an air cylinder 33 provided on the movable table 22 for raising and lowering the punch.

Note that the punch 30 is guided in its vertical movement by a bush 21 attached to the lower part of the skirt portion 29.

On the other hand, below the mold conveyance line, a lid device 34 is installed at a position directly below the fixed frame 3 to receive the lower surface of the mold when the hole is punched by the punch 30.

The table 35 of the lid device 34, which is disposed opposite to the mold 9, is raised and lowered by a lift cylinder 37 attached to a frame 36, and the raising and lowering movement is stabilized by a plurality of guide rods 38. .

A receiving box 39 that is slightly larger than the mold 9 and open at the top is formed on the table 35, and inside the receiving box 39, an air mat 40 is laid at the bottom. It is completely filled to form a sand bed 41.

The sand bed 41 constitutes a receiving body on the lower surface of the mold, and if necessary, powder may be mixed therein to improve the fluidity of the sand, or it may be composed of resin particles instead of sand. is also possible.

Further, a leveling device 42 for leveling the upper surface of the sand bed 41 is installed on the side of the lifter device 34.

As shown in FIG. 4, this leveling device 42 has a leveling plate 43 formed slightly wider than the width of the sand bed 41, and is attached to a frame 36 for horizontally reciprocating the leveling plate 43. It is composed of an air cylinder 44 and a guide rod 45 for stabilizing the reciprocating movement of the leveling plate 43.
When drilling the mold, the sand bed 41 is leveled every time the work is completed.

In addition, the vertical movement of the positioning locator 6 mentioned above, the two-dimensional horizontal compound movement of the forward and backward movement of the first movable table 13 and the left and right movement of the second movable table 22 applied to the punch device 28, and the elevation and descent of the punch 30. Further, the lifting and lowering operations of the lifter device 34 and the reciprocating operations of the leveling device 42 are controlled by a control device such as a microcomputer according to a predetermined program.

This embodiment is constructed as described above, and its operation will be explained below.

When the mold 9, which is intermittently conveyed through the mold conveying line, reaches the pin hole position, the positioning air cylinder 8 is first activated to lower the positioning locator 6 to the pin hole 6a.
are fitted to the dowel pins 11 of the flask 10, but in this case, as mentioned above, the movable pedestal 4 on the fixed pedestal 3 can freely move back and forth and left and right via the balls 5, so the above fitting operation is impossible. The movable pedestal 4 and mold 9 are fixed in a fixed positional relationship.

On the other hand, the lift cylinder 37 in the lifter device 34 is operated upward, and the receiving box 39 is raised together with the table 35 to bring the sand bed 41 into contact with the lower surface of the mold 9. In this case, the sand bed received by the air mat 40 41 is the air mat 4
Due to the elasticity of 0, the entire upper surface of the mold 9 is brought into close contact with the lower surface of the mold 9 without any gap.

In this state, the stepping motors 19 and 26 are driven to rotate, respectively, and the first movable table 13 is provided with a forward movement through the belt transmission 20.27 and the ball screw 15.25, and the second movable table 22 is provided with a left or right movement. A lateral movement to the right is applied to guide the punches 30 (one or, as the case may be, both) to a predetermined hole position and stop there.

Subsequently, the air cylinder 32 for raising and lowering the punch is operated, and the punch 30 descends to punch a gas vent hole by penetrating the mold 9. In this case, as shown in FIG. Since the hole is received by the floor 41, the hole can be drilled without causing any sand to fall out due to punching, that is, without causing the collapse of the casting sand around the hole at the through end.

Incidentally, the cut sand produced by punching falls to the sand bed 41 side together with the punch.

Subsequently, the punch 30 is lifted back up and one gas vent hole is formed in the mold 9, but after that, the above-mentioned drilling process is repeated according to the program to form one mold 9. A predetermined number of gas vent holes are formed in the hole, and when all the holes are completed, the positioning locator 6 is pulled out from the dowel pin 11, the movable pedestal 4 is separated from the mold 9, and the first and second movable tables are removed. 13 and 22 are returned to their original positions in preparation for the next work, while the table 35 of the lifter device 34
Then, the receiving box 39 is lowered and returned, and the sand bed 41 is separated from the lower surface of the mold.

After the lifter device 34 returns to its original position, the air cylinder 44 of the leveling device 42 is activated to reciprocate the leveling plate 43 to level the sand bed 41 in preparation for the next drilling operation. The sand scraped off by this leveling action is collected by a chute and a collection conveyor (not shown).

In this embodiment, two punch devices 28 are provided for one set of movable tables 13 and 22 that perform two-dimensional horizontal movement, but basically one punch device is sufficient.

In addition, the movable frame 4 is provided with two punch devices 28, respectively.
It is also possible to install a set of movable tables, and with such a configuration, Komei is more effective in shortening the work cycle time.

Furthermore, a ball screw 15 as a means of moving each table.
25 can be replaced with a rack-and-pinion, belt, or chain-type transmission device, or wheels can be used as table movement guide means, and the guide rod 32 of the punch holder 31 can be omitted depending on the punch diameter and casting sand quality. I don't mind if you do that.

In addition, in order to elastically adhere the receiving body 41 made of granular material such as sand or resin grains to the mold for pressing the lower surface of the mold, an air mat 40 is used in this embodiment, but instead of this, an air mat 40 is used. It is possible to use a rubber mat, a sponge mat, a spring mat, or the like.

As described above in detail, the present invention uses a punch of a punch device installed above the mold transport line so as to be movable in a direction parallel to the transport line and in a direction across the transport line. When drilling holes, the bottom surface of the mold is pressed by a receptor made of granular materials such as sand or resin particles, and the hole is punched out using a punch. It is possible to make holes, which shortens the cycle time for forming gas vent holes in the mold, making it possible to adapt to faster mold making operations.

Further, in the present invention, the receiving body is pressed against the lower surface of the mold through an elastic body such as an air mat, so that the upper surface of the receiving body is tightly attached to the lower surface of the mold regardless of the presence or absence of some unevenness. As a result, the effect of suppressing sand falling during punching is further increased.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front sectional view of the drilling machine, FIG. 2 is a side sectional view, and FIG. 3 is a plan view.
FIG. 4 is a plan view showing the lifter device and the leveling device, and FIG. 5 is a partially enlarged explanatory view showing the mode of the construction. 1...Roller conveyor, 3...Fixed frame, 13...First movable table, 22...
...Second movable table, 28... Punch device,
30... Punch, 34... Lifter device, 35... Table, 39...
Receiving box, 40... Eyamat, 41...
sand bed.

Claims (1)

[Scope of Claims] 1. A punching device, which is equipped with a punch for punching and can be moved up and down on a pedestal installed above the mold transport line, is moved in a direction parallel to the mold transport line and in a direction across the mold transport line. It is installed vertically movably below the mold conveyance line, and on the table of the tool, there is a receptacle that is taken from granular materials such as sand that adheres to the bottom surface of the mold when holes are made with the punch. A mold gas vent hole drilling machine characterized by being provided with. 2 A punch device equipped with a punch for punching that can be moved vertically is installed on a pedestal installed above the mold conveyance line so that it can be moved in a direction parallel to the mold conveyance line and in a direction across the mold conveyance line. It is installed vertically movably below the line, and on the table of the lid is provided a receiving body that is taken from granular materials such as sand that adhere to the bottom surface of the mold when making holes with the punch. A mold vent hole punching machine characterized in that an elastic body made of an air mat, sponge or the like is interposed between the body and the table to elastically support the receiving body.