JPS63260649A - Method for exciting vibration table - Google Patents

Abstract

PURPOSE:To uniformly fill in and to obtain a casting product of high dimensional accuracy by arranging a foamed pattern inside the casting frame arranged on a vibration table and exciting the vibration table with three axes vibration in the vertical direction and horizontal direction of fore and aft, right and left while charging dry sand. CONSTITUTION:A foamed pattern is buried in the dry sand filled in a casting frame with an expendable form pattern casting method and in the vibration table binding it the vibration table is arranged on the detector of the load of a load cell, etc., via damping member. The three axes excitable vibration table fixing vibration motors on the lower face and the peripheral side of the vibration table is subjected to the three axes excitation in the vertical direction and the horizontal direction of fore and aft, right and left, while controlling the exciting force so as to become constant at all times by automatically detecting the load by the charging state of the dry sand into the casting frame. The filling up of the dry sand is thus uniformized evenly to execute it effectively.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to a method for filling a casting frame using an extinguishing model casting method.
In a vibrating table that buries a foam model with the same shape as the product in chestnut sand and compacts it, the vibrating table is placed on a load detector and a vibrating motor is fixed to the bottom and circumferential surfaces of the vibrating table. , automatically detects the load depending on the state of dry sand being put into the cutting frame, and controls the excitation force so that it is always constant regardless of the stage of putting dry sand in the vertical direction and front and back. This invention relates to a method of vibrating a vibrating table that can be vibrated in 3 directions in the left and right horizontal directions to efficiently and evenly fill the dry sand.

[Conventional technology]

Conventionally, in the vanishing model casting method, in order to bury a foam model with the same shape as the product in the dry sand of the vJ construction frame using a vibrating table, it is necessary to use a vibrating table to bury the foam model in the dry sand of the casting frame placed on the vibrating table. Dry sand is temporarily added so that the thickness of the paste is usually about 200%.

The casting frame was vibrated vertically with an acceleration of 0.7 to 1g, and after tightening it, the vibration table was stopped, and the runner and sprue were connected in the center of the upper surface of the sand bed. At the same time, after adhering an appropriate number of foam models on the runner with adhesive, etc., dry sand is placed in the gap between the peripheral part of the casting frame and the foam model, and then secondary sanding is applied until the foam model is evenly buried without any gaps. Then, the secondary input of dry sand is compacted to prevent distortion of the foam model, and the vibration table is stopped. A slightly larger amount of dry sand is added to the upper surface of the casting frame in proportion to the amount that has fallen from the upper surface, and the photographing table is activated in the same way as before to bury the foam model in the dry sand. . And this foam model? Two stages in the casting frame,
When assembling and burying in three stages, the addition of dry sand and the activation of the vibrating table are repeated alternately0. In filling, - from the next filling of bed sand to the tertiary filling up to the top of one frame, sand is added and the photographing table is activated.

Repeated stops waste time during molding, and since the vibration direction of this vibration table is only accelerated in the vertical direction, it is difficult to create foam models with complex shapes, such as holes drilled diagonally upward or horizontally. , these holes are not filled with dry sand uniformly, and the downward facing surface of the foam model is also hard to fill with dry sand. Therefore, the casting frame due to uneven filling of dry sand The biggest defect is that even if molten fJ is poured into the mold, a cast product with the same shape as the foam model cannot be made in areas with a low filling degree. This method has disadvantages in that it is necessary to manually fill the core part of the mold, which takes time and reduces production efficiency, and cannot be applied to Tt products.

In addition, when burying the foam model assembled in two or three stages, fill the dry sand in stages with more care than when burying the foam model in one stage. If this is not done, there is a risk that the plug mold will be distorted and a casting defect will occur.Furthermore, in these cases, the excitation force of the vibrating table is always constant, so the application during the initial filling of bed sand is The load on the vibrating table increases during the tertiary sand injection, and when the foam model is buried in two or three stages, so the excitation force of the vibrating table will inevitably increase accordingly. This has various disadvantages, such as the dry sand being too small to be uniformly filled with dry sand, which may cause construction defects.

[Means for solving problems]

The present invention solves the current problem of slanting the model by burying the foam model in such a way that the filling of dry sand, which is one of the important steps in breaking the disappearing model, is carried out uniformly and reliably, and the model is not deformed. This book was created with this in mind, and it has deep holes drilled horizontally and a downward facing surface, so even complex-shaped models can be uniformly filled with dry sand. A vibration motor is fixed to the vibration table so that the vibration table can be vibrated in three axes: vertical direction, front and back, and left and right horizontal directions, and the vibration table is placed on a load detector such as a load cell. These ills are automatically detected according to the casting frame placed on the vibrating table and the filling status of dry sand that is successively introduced into the mold in stages, and a constant excitation force is always applied according to the load. In addition, the dry sand is evenly filled and the foam model is properly buried.

[For production]

In the present invention, after compacting bed sand of a certain thickness and arranging a foam model in a casting frame placed on a vibrating table, the vibrating table is moved vertically, front and rear, left and right horizontally while sequentially adding dry sand. By simultaneously applying three-axis vibrations to the dry sand, the dry sand is fluidized and evenly fills horizontal blind holes and downward facing surfaces. The excitation force is also increased, and the acceleration applied to the inside of the casting frame is kept constant, making it possible to efficiently bury the foamed model properly without causing distortion, and to obtain a cast product with the same shape as the foamed model and high dimensional accuracy. It is something that

〔Example〕

To explain one embodiment of the present invention, in a vibrating table for embedding a foam model in dry sand filled into a casting frame by the vanishing model casting method and compacting it, the vibrating table is connected to a loose cylinder such as an air cushion. A perturbation table capable of 3-axis vibration is placed on a load detector such as a load cell via a member, and a photographing motor is fixed to the lower surface and the circumferential surface of the vibration table, into the casting frame. Automatically detects the load depending on the dry sand input situation and adds force? It is possible to excavate on three axes in the vertical direction, front and rear, and horizontally to the left and right while controlling the excavation to be constant at all times, thereby making it possible to fill the dry sand uniformly and effectively. .

〔Effect of the invention〕

The present invention has a diagonal structure, and when embedding a foamed G-type in the core of dry sand in a casting frame using the disappearing model casting method, it is possible to absorb the load depending on the state of dry sand being put into the casting frame. Correspondingly, it shakes according to the weight detected by the load detector so that a constant excitation force is always obtained! By converting the rotational speed of the fIh motor, the optimal excitation force for the size of the casting frame and foam model is maintained from the time of adding bed sand to the final step of adding dry sand.Moreover, during this process, the vibration table is vertical Since the vibration is applied in three axes: direction, front and back, and left and right horizontal directions, the dry sand placed in the casting frame becomes fluidized, causing distortion to any foam model of any shape or shape. This helps to produce the best cast product without any casting defects by uniformly filling the product without any unevenness.

Patent applicant: Taiyo Casting Co., Ltd.

Claims (1)

[Claims] In a vibrating table that embeds a foam model in dry sand that is filled into a casting frame using the vanishing model casting method and compacts it, the vibrating table is placed on a load detector, and the lower surface of the vibrating table and its circumferential surface are A vibration table with a vibration motor attached to it that can vibrate on 3 axes automatically detects the load due to the state of dry sand being put into the casting frame, and keeps the excitation force constant at all times. A vibrating method for a vibrating table, characterized in that it is possible to vibrate in three axes in the vertical direction, front and rear, and left and right horizontal directions while controlling the vibration.