JP4789015B2 - How to send recovered sand to sand treatment facility - Google Patents

Description

  The present invention relates to a method for feeding recovered sand to a sand treatment facility. More specifically, the present invention relates to a sand treatment facility that treats recovered sand into green sand for molding and has a standard or average treatment capacity. The present invention relates to a method for adjusting the supply amount of recovered sand to the sand treatment facility so as to cope with casting of a small variety of castings.

When casting a small variety of castings using a sand processing facility having a standard or average processing capacity, for example, as disclosed in Japanese Patent Application Laid-Open No. 2004-98110, the thickness of the green mold varies. In such cases, problems such as excessive or insufficient processing capacity of the sand treatment facility have arisen.
JP, 2004-98110, A FIG. 1 or FIG.

The present invention has been made in view of the above circumstances, and the purpose thereof is to obtain a raw mold even when a small variety of castings are cast using a sand processing facility having a standard or average processing capacity. In response to the difference in thickness, the object is to propose a method by which the sand treatment facility can treat the collected sand.

In order to achieve the above object, the method of feeding the collected sand to the sand treatment facility in the present invention is a sand treatment in which the collected sand is processed into green sand for green molding and has a standard or average processing capacity. A method of adjusting the supply amount of recovered sand to the sand treatment facility in order to support casting of a small variety of castings using the equipment, and comprising the molding cycle time of the green molding machine and the thickness of the green mold Corresponding to the difference, if the thickness of the mold is thicker than the target value, the mold release time after pouring is delayed, and if it is thin, the time is advanced so that the mold after pouring It is characterized by adjusting the spreading time.

As is apparent from the above description, the present invention treats recovered sand into green sand for green molding and uses a sand processing facility having a standard or average processing capacity to cast a small variety of castings. In order to cope with the above, a method for adjusting the supply amount of the collected sand to the sand treatment facility, which corresponds to the difference in the mold molding cycle time and the mold thickness of the mold molding machine, the thickness of the mold If the thickness of the mold is thick, the mold release time after pouring is adjusted by delaying the mold release time after pouring, and if it is thin, the time for releasing the mold after pouring is adjusted. Even if a large variety of castings are cast using sand processing equipment with a high processing capacity, which practical effect can be processed in an appropriate manner corresponding to the difference in green mold thickness? Play.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a casting facility to which the present invention is applied will be described in detail with reference to FIGS.
Consider the case where three types of green molds having different thicknesses are formed as shown in FIG. That is, the mold 1 by the rising mold as shown in FIG. 1- (A), the mold 2 by the normal mold as shown in FIG. 1- (B), and the mold by the driving mold as shown in FIG. 1- (C). 3.
The green molds 1, 2, and 3 may be those having no horizontal split, those having a vertical split, and those having no vertical split.

Next, in the molding line 4 of FIG. 2, when the green mold 1 having the maximum thickness is molded by the green molding machine, the required maximum processing capacity of the sand processing facility 5 is the sand distribution capacity of 84 ton / hr, the recovery capacity Is 93 ton / hr, but the required average processing capacity calculated from the production plan is sand distribution capacity of 63 ton / hr and recovery capacity of 70 ton / hr.
If the sand treatment facility 5 is planned with the required maximum sand processing capacity at the time of forming the green mold 1 and at the maximum green mold thickness, it will become an excessive capacity and the equipment will be enlarged, so the required average sand processing capacity calculated from the production plan The capacity of the sand treatment facility 5 is set.

The molding tact of the molding line 4 is constant based on the equipment specifications, but when molding with the maximum green mold thickness, the kneading ability is insufficient, so waiting for sand occurs. This sand waiting is not controlled, and the molding time cycle is determined by the naturally occurring sand waiting.

On the other hand, when the control is not applied, the sand collection capacity of the open frame station largely fluctuates due to the fluctuation of the molding time cycle in addition to the fluctuation of the thickness of the green mold.

Specifically, it is necessary to form a green mold 3 with a small amount of sand and release the green mold 1 with a large amount of sand at the timing of molding in the fastest molding cycle where there is no sand waiting. Sand recovery is maximized.
In this case, since the sand collecting ability is insufficient, a disassembly cycle delay timer is provided under the condition of the green mold 1 thickness at the time of disassembly.

As shown in FIG. 3, when the green molds 1, 2, and 3 are formed, the dismantling tact is calculated and the delay timer set value is set so that the amount of sand is less than the sand collection capacity.
This delay timer setting value may be input as a molding condition for molding each model, and may be switched (shift data control) at the timing when the molding frame arrives at the unpacking station.

When measuring the mold thickness with a laser sensor or the like when molding is completed, the delay timer setting value is calculated by comparing the delay timer setting value according to the mold thickness from the measurement result of the mold thickness. It is also possible to control to store and switch at the timing when the molding frame comes to the unpacking station.

It is metal frame sectional drawing which shows the fluctuation | variation of the thickness of a green mold. It is a flowchart showing the relationship between a molding line and the sand treatment of a sand treatment facility. It is process drawing showing the delay timer control set according to the thickness of a green mold.

Claims (3)

The sand processing facility for the recovered sand is used for processing the recovered sand into raw sand for molding and using a sand processing facility having a standard or average processing capacity to support casting of a small variety of small castings. A method of adjusting the supply amount to
Corresponding to the difference in mold molding cycle time and mold thickness of mold molding machine,
If the thickness of the mold is thick, delay the release time of the mold after pouring, and if it is thin, increase the time.
A method for feeding recovered sand to a sand treatment facility, characterized by adjusting the spreading time of the green mold after pouring. In the method of feeding the collected sand according to claim 1 to the sand treatment facility,
The thickness of the green mold is obtained by measuring the height of the green mold in the green mold molding machine or by measuring the height of the green mold sent from the green mold molding machine. To feed to a sand treatment facility. In the method of feeding the collected sand according to claim 1 or 2 to the sand treatment facility,
The method for feeding recovered sand to a sand treatment facility is characterized in that the adjustment of the release time of the green mold after pouring is performed by a timer provided in an electric control panel for controlling the molding line.