JP3000108U - Sand mold release jig - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a lifting jig for smoothly releasing a sand mold having deep grooves or stripes from a model. [Structure] A jig 7 having a joint surface of the same shape which is slightly smaller than the model on the entire bottom surface of the sand mold is fixed to a push-up plate 4 located below through the model mount 3 and the push-up plate 4 is raised. A configuration of a push-up jig for releasing the sand mold 1 upward.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lifting jig for releasing a sand mold from a model.

[0002]

[Prior art]

 In the past, it was difficult to release the sand mold from the model when molding a cast product with deep grooves and stripes. When the sand mold is fragile and has deep grooves or stripes, a tensile force acts between the sand mold and the model when the sand mold is pulled out or extruded, which may cause the sand mold to collapse.

[0003]

[Problems to be solved by the device]

 For this reason, a slight draft is applied to the model to reduce the resistance and the mold is released. Therefore, in order to form deep grooves and stripes, it is necessary to have means for polishing or grinding the molded product.

[0004]

[Means for Solving the Problems]

 The present invention uses a sand mold lifting jig of the same shape as the model, which is slightly smaller (0.2 to 0.5 mm) than the model, to push the sand mold over the entire bottom surface in contact with the deep groove of the sand mold or the model of the stripe. It is lifted and released from the mold, and this jig is configured to be fixed to the lower extrusion plate that penetrates the model mount.

[0005]

[Action]

Therefore, according to the present invention, when the sand mold and the model are separated from each other by forming the gap between the sand mold and the model to be extremely small, the compression strength of the sand mold is larger than the mold release resistance. It will be possible. In the conventional jig, the whole or part of the deep groove or stripe receives a compressive load. against a load measurement can hardly value, the compressive strength of the sand mold is extremely large in the green sand molding method I compressive strength of 20~40kg / cm ² in 1.3~5kg / cm ² heat-curing method and a gas curing technique Therefore, when using the push-up jig according to the present invention, the sand mold can be molded without any problem.

[0006]

【Example】

 The sand mold lifting jig of the present invention will be described with reference to the accompanying drawings. As an example, the present invention describes a cylindrical sand mold (1) having deep grooves and stripes (2) as shown in the figure. FIG. 1 is an embodiment diagram of a jig (7) for pushing up and releasing the sand mold (1) of the present invention, in which (1) is a sand mold and (2) is a sand mold (1). It shows the deep grooves and stripes that have been formed. Therefore, the model (3) for molding the sand mold (1) is provided with the projections (4) for forming grooves and stripes in contrast to this. (5) shows a model mount, and the model (3) is mounted on the mount (5). (7) is a sand-type lifting tool, which is configured to penetrate the mount (5) and move up and down.

With reference to FIG. 2, the jig (7) is formed in the same shape as the model (3) on the entire bottom surface of the sand mold (1). Therefore, as can be understood from the embodiment diagram of FIG. 1, a very small gap (9) is formed between the model (3) and the sand mold (1), which causes the tensile resistance against the mold release. It absorbs.

FIG. 3 is a cross-sectional view showing the positional relationship between the sand mold (1) and the model (3). The push-up jig (7) of the present invention penetrates the model mount (5) and the sand mold ( 1) is pushed up and released from the mold, and the jig (7) releases the mold while contacting the entire bottom surface of the sand mold (1).

[0009]

[Effect of device]

 As described above, when the jig of the present invention is used, there is an extremely small gap between the sand mold and the model when the mold is released from the sand mold. Since it does not need to be attached, it is possible to form a precise sand mold, and it has an outstanding effect not found in the conventional mold releasing means for sand molds.

[Brief description of drawings]

FIG. 1 is a diagram of an embodiment of a lifting jig of the present invention.

FIG. 2 is a sectional view showing the relationship between the sand mold and the model.

[Fig. 3] Plan view of the jig

[Explanation of symbols]

 (1) ... sand mold (2) ... deep groove or stripe formed in sand mold (3) ... model (4) ... projection of model (5) ... model mount (7) ... sand mold lifting jig (8) … Escape clearance provided in jig (9)… Slight clearance between sand mold and model

Claims (1)

[Scope of utility model registration request] 1. A jig (7) having a joint surface of the same shape, which is slightly smaller than the model (3), is formed on the entire bottom surface of the sand mold (1) and penetrates through the model mount (5) and is located at the lower side. A sand mold releasing jig which is fixed to a lifting plate (4) and lifts the lifting plate (4) to release the sand mold (1) upward.