CN114871413A - A sand core positioning head adjustable sealing exhaust structure - Google Patents

Abstract

The invention relates to an adjustable sealing exhaust structure for a sand core positioning head, which comprises a sand core head with a cambered ball head, an exhaust swing ball head matched with the outer surface of the sand core head, and the pitch angle of the exhaust swing ball head is adjusted. The positive bottom of the exhaust swing ball head is a concave swing seal arc surface that matches the outer surface of the sand core head, the top of the swing seal arc surface is communicated with the exhaust channel, and there is an exhaust gas in the exhaust channel. Plug, the side bottom of the exhaust swing ball head is a swing ball arc surface, the swing ball arc surface is in close contact with the bearing arc surface built in the mold body, and the upper part of the exhaust swing ball head has limited steps and exhaust channels. The invention can adjust the sealing contact of the sand core positioning head, reduce the influence of the expansion error, improve the smoothness of exhaust, and avoid the aluminum water covering the sand core to hinder the exhaust.

Description

A sand core positioning head adjustable sealing exhaust structure

technical field

The invention relates to a low-pressure gravity casting sand core exhaust structure, which belongs to the technical field of low-pressure aluminum alloy and gravity casting moulds.

Background technique

Most of the existing sand core positioning tables are circular truncated positioning bosses (as shown in Figure 1), the upper surface is flat, and the exhaust is exhausted through the exhaust channel and the exhaust plug. This structure is difficult to accurately calculate the expansion coefficient of the mold and the expansion coefficient of the sand core during casting, resulting in a positioning error between the sand core positioning head of the mold and the positioning head of the sand core, the sealing performance cannot be guaranteed, and the structure is not easy to adjust. , causing the aluminum water to enter the exhaust plug to block the exhaust, resulting in the defect of the casting cavity.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above shortcomings and provide an adjustable sealing exhaust structure of the sand core positioning head, which can adjust the sealing contact of the sand core positioning head, reduce the influence of expansion errors, and improve the smoothness of exhaust.

The technical scheme adopted in the present invention is:

An adjustable sealing exhaust structure for a sand core positioning head, comprising a sand core head with a curved ball head, an exhaust swing ball head matched with the outer surface of the sand core head, and a limit for adjusting the pitch angle of the exhaust swing ball head The device, the positive bottom of the exhaust swing ball head is a concave swing seal arc surface that matches the outer surface of the sand core head, the top of the swing seal arc surface is communicated with the exhaust channel, and there are exhaust plugs in the exhaust channel. The side bottom of the air swing ball head is a swing ball arc surface, and the swing ball arc surface is in close contact with the bearing arc surface built in the mold body. The upper part of the exhaust swing ball head has limited steps and exhaust channels.

There is a swing gap at the non-tangent place between the swing sealing arc surface and the sand core head. The swing gap is filled with infiltrating graphite medium.

The limiting device includes a pressure plate, a fixing screw and a swing adjusting screw. The pressure plate is fixed on the mold body by the fixing screw. One end of the swing adjusting screw is pressed against the limit step of the exhaust swing ball and the other end is fixed on the pressure plate.

The limiting step is preferably formed by a combination of a plurality of circular truncated cones with different diameters.

There is a cooling water channel in the exhaust swing ball head.

The sand core head is the main exhaust part of the sand core. The mold body carries the exhaust swing ball head. The pressure plate is used to fix the swing adjustment screw. The swing adjustment screw is used to adjust the pitch angle of the exhaust swing ball head. The exhaust plug is made of powder metallurgy. Material prevents clogging.

The swing seal arc surface keeps sealing contact with the arc surface ball head of the sand core head at all angles, and the swing gap provides the swing gap of the exhaust swing ball head. The exhaust swing ball head includes cooling water channels, exhaust channels, etc. The cooling water channel cools the aluminum liquid by cooling the exhaust swing ball head and infiltrating the graphite medium to prevent the aluminum water from escaping into the exhaust plug. The infiltration of graphite medium can ensure the smooth adjustment of the exhaust swing ball head and prevent the aluminum water from sticking to the swing seal spherical surface.

The beneficial effects of the present invention are:

1. The exhaust adopts a floating adjustable structure, which can adjust the pitch structure of the exhaust swing ball head, and can be in close contact with the sand core head to reduce the influence of expansion errors;

2. The top of the sand core head is designed as a curved spherical head to adapt to multi-angle sealing exhaust;

3. The use of graphite infiltration technology ensures smooth adjustment of the floating exhaust swing ball head.

The present invention can prevent the aluminum water from covering the sand core and hindering the exhaust.

Description of drawings

1 is a schematic diagram of the existing sand core exhaust structure;

2 is a structural diagram of the adjustable sealing exhaust of the sand core positioning head of the present invention;

Fig. 3 is the three-dimensional structure diagram of the exhaust swing ball head of the present invention;

Fig. 4 is the sectional view of the exhaust swing ball head of the present invention;

FIG. 5 is a schematic diagram of the application of the present invention to the production of new energy battery box castings;

Among them, 1. Sand core head, 2. Exhaust swing ball head, 3. Swing sealing arc surface, 4. Exhaust channel, 5. Exhaust plug, 6. Swing spherical arc surface, 7. Limit step, 8. Swing gap, 9. Platen, 10. Fixing screw, 11. Swing adjustment screw, 12. Mold body, 13. Cooling water channel, 14. Upper mold, 15. Lower mold, 16. Inner cavity sand core, 17. Water channel sand core, 18. Aluminum water lift port, 19. Sprue, 20. Aluminum casting electric box body, 21. Sand core positioning table.

Detailed ways

Further description will be given below in conjunction with the accompanying drawings and specific embodiments.

Example

An adjustable sealing exhaust structure for a sand core positioning head, comprising a sand core head 1 with a cambered ball head, an exhaust swing ball head 2 matched with the outer surface of the sand core head 1, and the pitch of the exhaust swing ball head 2 is adjusted Angle limiting device, the positive bottom of the exhaust swing ball head 2 is a concave swing seal arc surface 3 that matches the outer surface of the sand core head, and the top of the swing seal arc surface 3 communicates with the exhaust channel 4, and the There is an exhaust plug 5 in the air passage 4, the side bottom of the exhaust swing ball head 2 is a swing spherical arc surface 6, and the swing spherical arc surface 6 is in close contact with the bearing arc surface provided in the mold body 12, and the exhaust swing ball head 2 The upper part is limited to the step 7 and the exhaust duct 4.

The limiting device includes a pressure plate 9, a fixing screw 10 and a swing adjustment screw 11. The pressure plate 9 is fixed on the mold body 12 by the fixing screw 10. One end of the swing adjustment screw 11 is pressed against the limit step 7 of the exhaust swing ball and the other end is fixed. on the platen 9.

There is a swing gap between the swing sealing arc surface and the sand core head, and the swing gap is filled with infiltrating graphite medium. The limiting step 7 is formed by the combination of two circular troughs with different diameters, and there is a cooling water channel 13 in the exhaust swing ball head.

The adjustable sealing exhaust structure of the sand core positioning head of the present invention is applied to a mold for producing a new energy electric box body:

As shown in Figure 5, the mold is divided into an upper mold 14 and a lower mold 15. The sand core positioning table 21 refers to the positioning part of the sand core on the lower mold, and the positioning head (sand core head 1) refers to the positioning of the sand core on the upper mold. part. Before production, check whether the exhaust plugs of all parts of the mold are in good condition and smooth. Adjust the pitch angle of the exhaust swing ball head by swinging the adjustment screw. After checking that there is no problem, the mold is heated up and put on the machine. After confirming that the upper and lower molds are closed, the mold is opened and released. Enter the sand core (inner cavity sand core 16, water channel sand core 17), after the mold is closed, the aluminum liquid enters the mold cavity from the aluminum water lift port 18, and the sand core is burned at high temperature to generate gas, and the gas is discharged through the exhaust plug exhaust channel The mold cavity; the excess aluminum liquid enters the runner 19, and finally the aluminum casting electric box body 20 is prepared.

The above is a detailed introduction of the invention with reference to specific embodiments, and the protection scope of the present invention is not limited thereto.

Claims (6)

1. A sand core positioning head adjustable sealing exhaust structure is characterized in that, comprising a sand core head with a cambered ball head, an exhaust swing ball head matched with the outer surface of the sand core head, an adjustment exhaust swing ball The limiting device for the head pitch angle, the positive bottom of the exhaust swing ball head is a concave swing seal arc surface that matches the outer surface of the sand core head, the top of the swing seal arc surface is communicated with the exhaust channel, and the inside of the exhaust channel There is an exhaust plug, the side bottom of the exhaust swing ball head is a swing ball arc surface, the swing ball arc surface is in close contact with the bearing arc surface built in the mold body, and the upper part of the exhaust swing ball head has limited steps and exhaust channels. 2 . The adjustable sealing exhaust structure of the sand core positioning head according to claim 1 , wherein there is a swing gap at the non-tangent place between the swing sealing arc surface and the sand core head. 3 . 3 . The adjustable sealing exhaust structure of the sand core positioning head according to claim 2 , wherein the swing gap is filled with an infiltrating graphite medium. 4 . 4. The adjustable sealing exhaust structure of a sand core positioning head according to claim 1, wherein the limiting device comprises a pressure plate, a fixing screw and a swing adjusting screw, and the pressure plate is fixed on the mold body by the fixing screw , one end of the swing adjustment screw is pressed against the limit step of the exhaust swing ball head, and the other end is fixed on the pressure plate. 5 . The adjustable sealing exhaust structure of the sand core positioning head according to claim 1 , wherein the limiting step is preferably formed by a combination of a plurality of circular troughs with different diameters. 6 . 6 . The adjustable sealing exhaust structure of the sand core positioning head according to claim 1 , wherein a cooling water channel is arranged in the exhaust swing ball head. 7 .

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