JPS594223B2 - 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, an appropriate number of gas vent holes are formed in the mold, but traditionally this work was done manually using a tool such as a drill or punch. It is common for there to be.

However, especially in the case of large molds or molds with multiple fillings, it is necessary to provide many gas vent holes in one mold, which forces workers to work harshly and creates a poor working environment. There were some problems, such as the risk of forgetting to read.

The purpose of the present invention is to eliminate the above-mentioned conventional problems and to provide a machine that can automatically perform the work of drilling gas vent holes in a mold carried out from a mold making machine using mechanical power. be.

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

As shown in the figure, a rectangular frame larger than the mold flask 10 is formed on the upper part of a funnel 2 which is installed on both sides of the roller conveyor 10 so as to straddle the mold conveyance line constituted by the roller conveyor 1. A fixed pedestal 3 is fixed to the fixed pedestal 3, and a movable pedestal 4, which is also formed in the shape of a rectangular frame, is mounted on the fixed pedestal 3 in a direction parallel to the mold conveyance line direction via an appropriate number of removable balls 5. (hereinafter referred to as the front-back direction) and 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 rod holder 7 fixed to the movable frame 4, and is also moved up and down by the positioning air cylinder 8 supported by the movable frame 4. Prior to drilling, 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 a driven pulley and a bracket 18 in the belt transmission device 20.

On the other hand, the second movable table 22 is the first movable table 1
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 37 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 spindle units 28 in this embodiment.

The second movable table 22 is formed with a front-open skirt portion 29 that hangs downward through the first movable table 13, the movable pedestal 4, and the fixed pedestal 3, and the unit body 30 of each spindle unit 28 has a skirt portion 29. It is slidably attached to two guide rods 31 that are attached vertically and parallel to each other in the section 29, and is moved up and down by an air cylinder 32 for raising and lowering the drill.

A spindle 35 equipped with a chuck 34 of a drill 33 is rotatably attached to each unit main body 30, and the spindle 35 is rotated by an air motor 36 for rotating the drill.

Incidentally, the drill 33 is guided in its vertical movement by a bush 21 attached to the lower part of the skirt portion 29.

Therefore, the above-mentioned vertical movement of the positioning locator 6,
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 given to the spindle unit 28, as well as the rotation and vertical movement of the drill 33, are controlled by a control device such as a microcomputer, for example. It is controlled according to a predetermined program.

In other words, the mold 9 is intermittently conveyed through the mold conveyance line.
However, when the locator reaches the position, the air cylinder 8 for positioning is activated, and the positioning locator 6 is lowered to fit the pin hole 6a into the dowel pin 11 of the flask 10. Since the movable pedestal 4 on the mold 3 can freely move back and forth, left and right via the ball 5, the above-mentioned mating operation is impossible.
are fixed in a certain positional relationship.

In this state, the stepping motors 19 and 26 are driven to rotate, respectively, and the first movable table 13 is rotated through the belt transmissions 20 and 27 and the ball screws 15 and 25.
is given a forward movement and the second movable table 22 is given a lateral movement to the left or right to guide the drill 33 (one or both, as the case may be) to a predetermined drilling position and stop it there. .

Next, the air motor 35 for rotating the drill and the air cylinder 32 for lifting and lowering are activated, and the drill 33 descends while rotating to drill a hole in the mold 9, and after piercing, it is reversed and returned to its original position. .

After forming one gas vent hole in this way, the above-mentioned Koumei then repeats the work according to the program to form a predetermined number of gas vent holes in one mold 9,
Once all the holes have been drilled, the positioning locator
6 is pulled out from the knock pin 11 and the movable pedestal 4 is separated from the mold 9, and the first. Each second movable table 1
3° 22 are each returned to their original positions in preparation for drilling holes in the next mold.

In this embodiment, two spindle units 28 are provided on a pair of movable tables 13 and 22 that perform two-dimensional horizontal movement, but basically one spindle unit is sufficient.

Furthermore, it is also possible to install two sets of movable tables each having a spindle unit on the movable pedestal 4, and such a configuration is effective in shortening the cycle time of work.

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 31 of the spindle unit 28 can be omitted depending on the drill diameter and casting sand quality. I don't mind if you do that.

In this example, rotary drilling using the drill 33 was explained in the case of a type, but the drilling tool may be a punch instead of a drill, and drilling using such a punch is also possible. In the case of an open-hole type, the rotary drive device is omitted.

As described in detail above, in the present invention, a first movable table is attached to a pedestal disposed above a mold conveyance line so as to be movable in a direction parallel to the conveyance line, and a second movable table is attached to the first movable table. A table is mounted so as to be movable in a direction across the conveyance line, and a tool holder for holding a rod-shaped drilling tool is mounted on the second movable table so as to be movable up and down, and the first movable table and the second movable table and a table moving means for repeatedly moving the drilling tool, and when drilling, the drilling tool is moved to a specified drilling position by the raising and lowering movement of the drilling tool and the movement of the first movable table and the movement of the second movable table, either alone or in combination. Therefore, according to the present invention, the drilling of the gas vent hole in the mold can be performed automatically using mechanical power, so that the worker is not forced to work in a harsh and adverse environment. It is possible to free people from labor and also prevent the problem of forgetfulness.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front sectional view of the perforator, FIG. 2 is a side sectional view, and FIG. 3 is the same (plan view). 1...Roller conveyor , 3... fixed frame, 4... movable frame, 6... positioning locator, 8... position... air cylinder for positioning, 9... ... Mold, 11 ... Dowel pin, 13 ... First movable table, 22 ...
・Second movable table, 28... spindle unit, 30... unit body, 32...
・Air cylinder for raising and lowering the drill, 33...Trill, 35...Spin donope 36...
Air motor for rotating drills.

Claims (1)

[Claims] 1. A first movable table is attached to a frame disposed above the mold conveyance line so as to be movable in a direction parallel to the conveyance line, and a second movable table is attached to the first movable table in a direction transverse to the conveyance line. movably mounted, this second
A mold degassing hole drilling machine in which a tool holder for holding a rod-shaped drilling tool is attached to the movable table so as to be movable up and down, and the table is further used to repeatedly move the first movable table and the second movable table. A moving means may be provided, and during drilling, the drilling tool may be sequentially moved to a designated drilling position by a single or simultaneous combined movement of the vertical movement of the drilling tool and the movement of the first movable table and the movement of the second movable table. A mold gas vent hole drilling machine characterized by a structure of: