Air exhaust structure for gravity casting water jacket sand core of aluminum alloy cylinder cover

Abstract

The utility model discloses an aluminum alloy cylinder cover gravity casting water jacket sand core air exhaust structure which comprises a die bottom die and further comprises an air exhaust auxiliary connecting block and an air exhaust pipe. A plurality of air channels leading to the water channel sand core are formed in the side face of the die bottom die, and a connecting hole is formed in each air channel correspondingly. The air exhaust auxiliary connecting block is detachably connected to the side face of the die bottom die through a fastener penetrating through the connecting hole and covers an air outlet of the air channel, an air exhaust opening is formed in the air exhaust auxiliary connecting block and is in butt joint with the air outlet of the air channel, the air exhaust pipe is inserted into the air exhaust opening, and the air exhaust pipe is connected with an external air exhaust pump. According to the utility model, stable and reliable exhaust of the water jacket sand core can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to an aluminium alloy cylinder cover gravity casting water jacket sand core air exhaust structure for gravity casting field. BACKGROUND

[0002] When using water jacket sand core to carry out gravity casting, the water jacket sand core will generate gas in the pouring process, so that the product produces pores in the production process, and the product quality is affected, therefore, the water jacket sand core needs to be exhausted. The sand core is exhausted by the air pump.

[0003] The traditional air exhaust operation is mainly carried out by the air exhaust pump and the air duct preformed in the sand core. This operation form needs to design the sand core or its supporting structure, and reserve the air exhaust space, which affects the subsequent process, and sometimes even is limited by the mold structure form and is difficult to realize. The traditional air exhaust form is difficult to guarantee the sealing property of the air exhaust pipe of the air exhaust pump and the air duct, which affects the air exhaust effect. In addition, the direct connection of the air exhaust pump and the mold sometimes also affects the sand core and the internal casting. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the defects of prior art, and provides an aluminium alloy cylinder cover gravity casting water jacket sand core air exhaust structure, which can realize stable and reliable exhaust of the water jacket sand core.

[0005] One technical scheme for realizing the above-mentioned purpose is as follows: an aluminium alloy cylinder cover gravity casting water jacket sand core air exhaust structure, comprising a mold bottom die, further comprising an air exhaust auxiliary connecting block and an air exhaust pipe;

[0006] A plurality of air ducts leading to the water jacket sand core are formed in the side surface of the mold bottom die, and a connecting hole is arranged corresponding to each air duct;

[0007] The air exhaust auxiliary connecting block is detachably connected to the side surface of the mold bottom die through the fastener penetrating through the connecting hole, covers the air outlet of the air duct, and the air exhaust auxiliary connecting block is provided with an air exhaust port, the air exhaust port is connected with the air outlet of the air duct, the air exhaust pipe is inserted into the air exhaust port, and the air exhaust pipe is connected with the external air exhaust pump.

[0008] Further, the air duct is arranged obliquely downward, and the air exhaust port connected with the air outlet of the air duct is also arranged obliquely downward and in a straight line with the air duct.

[0009] Further, the inner diameter of the air exhaust port is greater than the diameter of the air duct.

[0010] Further, the air exhaust pipe is a seamless steel pipe,

[0011] Further, the connecting part of the air exhaust pipe and the air exhaust port is a 2 / 1 pipe thread.

[0012] The utility model discloses a kind of aluminium alloy cylinder cover gravity casting water jacket sand core air extraction structures, by the air extraction auxiliary connecting block and air extraction pipe of additional, connecting air extraction pump and water jacket sand core, with following advantage effect:

[0013] 1. by the application air extraction auxiliary connecting block realizes the butt joint of air extraction pump and water jacket sand core, improves sealing effect and air extraction effect, and reduces the direct influence of air extraction pump to sand core.

[0014] 2. detachable air extraction auxiliary connecting block can be installed during air extraction operation, remove after operation, reduce the influence of exhaust operation to other production processes,

[0015] 3. air extraction auxiliary connecting block can guide the direction of air extraction, avoid interference with mould.

[0016] 4. make the structure design of mould and its air passage more free. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the top view of a kind of aluminium alloy cylinder cover gravity casting water jacket sand core air extraction structure of example 1;

[0018] Figure 2 It is the front view of a kind of aluminium alloy cylinder cover gravity casting water jacket sand core air extraction structure of example 1;

[0019] Figure 3 It is the structure schematic view of air extraction auxiliary connecting block;

[0020] Figure 4 It is Figure 3 A-A direction section view;

[0021] Figure 5 It is the structure schematic view of air extraction auxiliary connecting block in air extraction pipe;

[0022] In the drawing, 1, mould bottom die;2, air extraction auxiliary connecting block;3, air extraction pipe;4, water channel sand core. DETAILED DESCRIPTION

[0023] In order to better understand the technical scheme of the utility model, the following is specifically explained in detail by example:

[0024] Please refer to Figures 1 to 5 , the implementation mode of a kind of aluminium alloy cylinder cover gravity casting water jacket sand core air extraction structure of the utility model.

[0025] A plurality of air passages are formed in the mold base 1. In this embodiment, two air passages are formed in the mold base 1 on both sides thereof, and are located on both sides of the water jacket core 4. The air passages are inclined downward, so that the air passages will not interfere with a mold top (not shown in the drawing) covering the mold base 1 when the air extraction pipe 3 is inserted into the air extraction port.

[0026] The air extraction auxiliary connecting block 2 is detachably connected to the side surface of the mold base by means of fasteners passing through the connecting holes, and covers the air outlet of the air passage. The air extraction auxiliary connecting block 2 is provided with an air extraction port, which is in abutment with the air outlet of the air passage. The inner diameter of the air extraction port is larger than the diameter of the air passage. The air extraction auxiliary connecting block 2 is tightly fixed to the air outlet of the air passage of the core by means of fasteners, so that the sealing property of the subsequent air extraction connection can be ensured. The air extraction port is in line with the air passage, so that the air passage is unobstructed, and the air extraction effect is ensured. In other embodiments, the air extraction auxiliary connecting block 2 with the air extraction port in the corresponding direction can be designed according to the actual design direction of the air passage.

[0027] The air extraction pipe 3 is inserted into the air extraction port, and is connected to an external air extraction pump. The air extraction pipe 3 is a seamless steel pipe, and the connection part of the air extraction pipe 3 and the air extraction port is a 2 / 1 pipe thread, so that the sealing effect is ensured.

[0028] The steps of using the aluminum alloy cylinder cover gravity casting water jacket core air extraction structure of this embodiment are as follows:

[0029] 1. The air extraction auxiliary connecting block is installed;

[0030] 2. The air extraction pipe is connected to the air extraction auxiliary connecting block;

[0031] 3. The air extraction pipe and the air pump are connected, and the air extraction operation is started;

[0032] 4. The air extraction pipe and the air extraction auxiliary connecting block are separated;

[0033] 5. The air extraction auxiliary connecting block is removed.

[0034] Those skilled in the art should understand that the above embodiments are only used to illustrate the present application, and are not used as a limitation on the present application. Any changes and modifications of the above embodiments within the scope of the essential spirit of the present application will fall within the scope of the claims of the present application.

Claims

1. An aluminum alloy cylinder head gravity cast water jacket sand core venting structure comprising a mold drag, characterized by, The air suction auxiliary connecting block and the air suction pipe are further included; A plurality of air channels are formed on the side of the bottom mold of the mold and lead to the sand core of the water channel, and a connecting hole is arranged corresponding to each air channel; The air suction auxiliary connecting block is detachably connected to the side of the bottom mold of the mold through a fastener penetrating through the connecting hole, covers the air outlet of the air channel, and is provided with an air suction opening, the air suction opening is in butt joint with the air outlet of the air channel, the air suction pipe is inserted into the air suction opening, and the air suction pipe is connected with an external air suction pump.

2. The aluminum alloy cylinder head gravity cast water jacket sand core venting structure of claim 1 wherein, The air channel is arranged obliquely downward, and the air suction opening in butt joint with the air outlet of the air channel is also arranged obliquely downward and in a straight line with the air channel.

3. The aluminum alloy cylinder head gravity cast water jacket sand core venting structure of claim 1 wherein, The inner diameter of the air suction opening is greater than the diameter of the air channel.

4. The aluminum alloy cylinder head gravity cast water jacket sand core venting structure of claim 1 wherein, The air suction pipe is a seamless steel pipe.

5. The aluminum alloy cylinder head gravity cast water jacket sand core venting structure of claim 4 wherein, The connection part of the air suction pipe and the air suction opening is a 2 / 1 pipe thread.

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