A fixing device and use method for large-size cold iron of casting cold core box

Abstract

The present invention relates to the field of casting, and relates to a fixing device and a method for using a large-size chiller for casting a cold core box. The fixing device for a large-size chiller for casting a cold core box has a draw block; the draw block is connected to a telescopic mechanism I on the outside of the cold core box; the draw block is located in a cavity formed by the upper half mold of the cold core box and the lower half mold of the cold core box, and a window is provided on the upper end surface of the draw block for rotating the block; the rotating block is hingedly connected to the draw block; a push rod is also provided in the cavity of the draw block, one end of the push rod is in contact with the rotating block, and the other end extends out of the draw block and is connected to the telescopic mechanism II on the outside of the cold core box; the top of the inner wall surface of the upper half mold of the cold core box is adsorbed with the chiller; the rotating block is a structure that can rotate around the hinge shaft under the action of the push rod and contact the chiller. The present invention solves the problem that the large-size chiller cannot be fixed when it is located in the upper half cold core box, and avoids the displacement or falling off of the chiller during the cold core production process.

Description

Technical Field

[0001] The invention relates to the field of casting, and in particular to a fixing device for a large-size cold iron of a casting cold core box and a use method thereof. Background Art

[0002] In the casting production process, cold core boxes are increasingly used due to their advantages such as high core making efficiency and high dimensional accuracy. Normally, the cold core box is divided into two halves, the upper and lower halves. When producing cold cores, the two halves are combined together, and cold core sand is injected into the core box through the sand shooting hole, and then taken out after it hardens to form a sand core.

[0003] According to the requirements of the casting process, sometimes a chill needs to be placed on the cold core; when the chill is small and is not located in the upper half of the cold core box, a magnet can be embedded in the corresponding position of the cold core box where the chill is placed to fix the chill; however, when the chill is large and is placed in the upper half of the cold core box, the chill cannot be fixed by adsorption alone, and the chill is prone to shifting or even falling off during the cold core production process, resulting in the chill being unable to play an effective chilling role and damaging the lower half of the core box.

[0004] How to place the large-sized chiller in the upper cold core box and how to prevent the chiller from shifting or falling off are difficult problems that need to be solved during the production process.

[0005] The applicant conducted a domestic and foreign technical search on diesel engine cylinder head casting technology and found that:

[0006] 1. Chinese patent, patent name: Casting core mold with built-in chill in cold core tooling, publication number CN 202316917 U, publication date 2012.07.11, in which "a magnet is provided in the inner cavity of the upper core box and / or the lower core box, and the chill is adsorbed on the magnet", and "a magnet is used to adsorb and fix the chill on the cold core tooling". The disadvantage is that when the chill is located in the lower core box or the chill is small, it can be fixed by magnets, and it is not easy to shift during the production process. However, for thick and large chills and the chill is located in the upper core box in a suspended state, if it is fixed by magnets, due to the limited contact area between the chill and the mold and the limited number of magnets placed in the contact area, this method will not be able to achieve an effective fixing effect, and vibration will occur when the upper and lower cold core box molds are closed. At the same time, the core sand will also have a large impact force during the process of shooting sand into the inner cavity of the mold, which will cause the chill to shift, resulting in the chill being unable to play an effective chilling role during the casting production process.

[0007] 2. Chinese patent, patent name: Universal mold for sand core and cold core box core shooting and manufacturing method, publication number CN107745087 A, publication date 2018.03.02. The patent adopts the method of "fixing the cold iron on the daughter sand core", "inserting the daughter sand core on the mother sand core", and "bonding the mother sand core and the daughter sand core" for cold iron fixing. The disadvantage is that it is necessary to produce two kinds of sand cores, the mother sand core and the daughter sand core, and then bond the two kinds of sand cores. The operation process of this method is relatively cumbersome, and an adhesive is required in the bonding process of the two sand cores. The adhesive will produce gas under the high temperature of the molten iron, which is easy to cause porosity-type casting defects in the casting. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a fixing device and a use method for a large-size chiller of a casting cold box.

[0009] The present invention adopts the following technical scheme to achieve the above-mentioned purpose:

[0010] A fixing device for casting large-size cold iron of a cold core box, the fixing device comprises a drawer block located in a cavity formed by a cold core box upper mold and a cold core box lower mold; one end of the drawer block is located outside the cold core box upper mold and the cold core box lower mold; the drawer block is connected to a telescopic mechanism I on the outside of the cold core box so that the drawer block can move horizontally; the drawer block is a hollow frustum structure with a gradually decreasing diameter from the outside of the cold core box mold to the inside; the drawer block is located in the cavity formed by the cold core box upper mold and the cold core box lower mold and has a window for rotating the block; the rotating block is hingedly connected to the drawer block, and It can rotate around the hinge axis; a push rod is also arranged in the cavity of the drawing block, one end of the push rod is in contact with the rotating block, and the other end extends out of the drawing block and is connected with the telescopic mechanism II outside the cold core box, and can perform telescopic movement under the action of hydraulic or mechanical devices, thereby pushing the rotating block to rotate around the hinge axis; the push rod and the telescopic mechanism II connected to the push rod are fixed on the drawing block and can move with the drawing block; the top of the inner wall surface of the upper half mold of the cold core box is adsorbed with cold iron; the rotating block is a structure that can rotate around the hinge axis and contact the cold iron under the action of the push rod; the rotating block and the cold iron are in surface contact.

[0011] The rotating block is fan-shaped; the contact area between the rotating block and the cold iron is a plane.

[0012] A spring is also arranged between the rotating block and the withdrawing block to reset the rotating block.

[0013] The number of the springs is one or more.

[0014] A method for using a fixing device for a large-size cold iron of a casting cold core box, the specific steps of the method for using are as follows:

[0015] (1) A strong magnet is embedded in the upper half mold of the cold core box so that the cold iron is pre-adsorbed on the mold;

[0016] (2) Pulling the block into the predetermined position in the cold box;

[0017] (3) Extend the push rod and lift the rotating block to the cold iron pre-support position;

[0018] (4) Drop the upper half mold of the cold core box to complete the mold closing;

[0019] (5) The push rod continues to extend, causing the rotating block to press the chill;

[0020] (6) Shoot sand into the mold and blow in curing agent;

[0021] (7) After the sand core hardens, the push rod is shortened and the rotating block falls back to its original position;

[0022] (8) Remove the block;

[0023] (9) Remove the sand core.

[0024] The present invention proposes a fixing device and a method for using a large-size cold iron of a casting cold box, which adopts the above-mentioned technical solution and has the following advantages:

[0025] The fixing device of the large-size chiller of the casting cold core box can solve the problem that the large-size chiller cannot be fixed when it is located in the upper half of the cold core box, thereby avoiding the displacement or falling off of the chiller during the cold core production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional structural schematic diagram of the present invention.

[0027] Figure 2 It is a schematic diagram of the top structure of the present invention.

[0028] Figure 3 It is a schematic diagram of the steps of the use process of the present invention.

[0029] In the figure: 1. cold iron; 2. upper half mold of cold core box; 3. rotating block; 4. hinge shaft; 5. draw block; 6. ejector rod; 7. telescopic mechanism II; 8. telescopic rod II; 9. spring; 10. lower half mold of cold core box; 11. telescopic mechanism I connected to the draw block; 12. telescopic rod I. DETAILED DESCRIPTION

[0030] The following is a further description of a fixing device and a method for using a large-size chiller for a casting cold box according to the present invention in conjunction with the accompanying drawings.

[0031] like Figure 1 , Figure 2As shown, a fixing device for casting large-size cold iron of a cold core box, the fixing device has a draw block 5 located in a cavity formed by the cold core box upper mold 2 and the cold core box lower mold 8; one end of the draw block 5 is located outside the cold core box upper mold and the cold core box lower mold; the draw block 5 is connected to the telescopic mechanism Ⅰ11 on the outside of the cold core box through a telescopic rod Ⅰ12 connecting the draw block telescopic mechanism, so that the draw block 5 can move horizontally; the draw block 5 is a hollow frustum structure with a gradually decreasing diameter from the outside of the cold core box mold to the inside; the draw block 5 is located in the cavity formed by the cold core box upper mold and the cold core box lower mold, and has a window for the rotation block 3 to move; the rotation block 3 and the draw block 5 are hingedly connected through a hinge shaft 4 The draw block 5 is connected and can rotate around the hinge shaft 4; a push rod 6 is also arranged in the cavity of the draw block 5, one end of the push rod 6 is in contact with the rotating block 3, and the other end extends out of the draw block 5 and is connected to the telescopic mechanism Ⅰ11 outside the cold core box through the telescopic rod Ⅰ12 connected to the telescopic mechanism of the draw block, and can perform telescopic movement under the action of the telescopic mechanism Ⅱ7, thereby pushing the rotating block 3 to rotate around the hinge shaft 4; the push rod 6 and the telescopic mechanism 7 are fixed on the draw block 5 and can move with the draw block 5; the top of the inner wall surface of the upper half mold 2 of the cold core box is adsorbed with the cold iron 1; the rotating block 3 is a structure that can rotate around the hinge shaft 4 and contact the cold iron 1 under the action of the push rod 6; the rotating block 3 is in surface contact with the cold iron 1.

[0032] The rotating block 3 is fan-shaped; the contact area between the rotating block 3 and the cold iron 1 is a plane.

[0033] A spring 9 is also provided between the rotating block 3 and the withdrawing block 5 for returning the rotating block 3 to its original position.

[0034] The spring 9 is one or more.

[0035] The telescopic mechanism 7 connecting the top rod can be one or more.

[0036] The telescopic mechanism 11 connecting the drawer blocks is one or more.

[0037] The present invention provides a fixing device for a large-size cold iron of a casting cold box to achieve the above-mentioned purpose, which comprises a drawer block 5, a push rod 6, a rotating block 3, a spring 9, a hinge shaft 4 and the like.

[0038] The withdrawing block 5 is connected to the telescopic mechanism Ⅰ11 connected to the withdrawing block on the outside of the cold box through a telescopic rod Ⅰ12 connected to the telescopic mechanism of the withdrawing block, and can move horizontally.

[0039] The interior of the drawer block 5 is a hollow structure, and the four side planes have draft angles.

[0040] The drawer block 5 has a window on it.

[0041] The push rod 6 is connected to the telescopic mechanism II7 outside the cold core box through a telescopic rod II8 connected to the push rod telescopic mechanism, and can perform telescopic movement. The hydraulic or mechanical device connected to the push rod 6 is fixed on the pumping block 5 and can move with the pumping block 5.

[0042] The rotating block 3 is fan-shaped.

[0043] The rotating block 3 is assembled with the withdrawing block 5 via the hinge shaft 4 and can rotate.

[0044] The rotating block 3 is in surface contact with the cold iron 1, and the contact area between the rotating block 3 and the cold iron 1 is a plane.

[0045] One end of the spring 9 is connected to the drawer block 5, and the other end is connected to the rotating block 3. The spring 9 may be one or more.

[0046] The method and steps of using a fixing device for a large-size cold iron of a casting cold core box in the cold core production process of the present invention are as follows:

[0047] (1) A strong magnet is embedded in the upper half mold 2 of the cold core box so that the cold iron 1 is pre-adsorbed on the mold;

[0048] (2) Pulling block 5 into a predetermined position in the cold box;

[0049] (3) Extend the push rod 6 and lift the rotating block 3 to the pre-support position of the chiller 1;

[0050] (4) Drop the upper half mold 2 of the cold core box to complete the mold closing;

[0051] (5) The push rod 6 continues to extend, causing the rotating block 3 to press against the chill 1;

[0052] (6) Shoot sand into the mold and blow in curing agent;

[0053] (7) After the sand core hardens, the push rod 6 is shortened and the rotating block 3 falls back to its original position;

[0054] (8) Remove block 5;

[0055] (9) Take out the sand core and complete the cold core box sand core production.

Claims

1. A fixing device for a large-size cold iron of a casting cold box, characterized in that: The fixing device comprises a drawer block located in the cavity formed by the upper and lower molds of the cold core box; one end of the drawer block is located outside the upper and lower molds of the cold core box; the drawer block is connected to the telescopic mechanism I on the outside of the cold core box, so that the drawer block can move horizontally; the drawer block is a hollow frustum structure with a gradually decreasing diameter from the outside of the cold core box mold to the inside; the drawer block is located in the cavity formed by the upper and lower molds of the cold core box, and a window for the movement of the rotating block is provided on the upper end surface of the drawer block; the rotating block is hingedly connected to the drawer block and can rotate around the hinge axis; a push rod is also provided in the cavity of the drawer block, and one end of the push rod is connected to the rotating block The other end extends out of the drawing block and is connected to the telescopic mechanism II outside the cold core box, and can perform telescopic movement under the action of hydraulic or mechanical devices, thereby pushing the rotating block to rotate around the hinge axis; the push rod and the telescopic mechanism II connected to the push rod are fixed on the drawing block and can move with the drawing block; the top of the inner wall surface of the upper half mold of the cold core box is adsorbed with cold iron; the rotating block is a structure that can rotate around the hinge axis and contact the cold iron under the action of the push rod; the rotating block and the cold iron are in surface contact; the rotating block is fan-shaped; the contact area between the rotating block and the cold iron is a plane; a spring is also provided between the rotating block and the drawing block to reset the rotating block.

2. A fixing device for a large-size chiller of a casting cold box as claimed in claim 1, characterized in that: The number of the springs is one or more.

3. A method for using the fixing device for large-size cold iron of a casting cold box as claimed in any one of claims 1 to 2, characterized in that: The specific steps of use are as follows: (1) A strong magnet is embedded in the upper half mold of the cold core box so that the cold iron is pre-adsorbed on the mold; (2) Pulling the block into the predetermined position in the cold box; (3) Extend the push rod and lift the rotating block to the cold iron pre-support position; (4) Drop the upper half mold of the cold core box to complete the mold closing; (5) The push rod continues to extend, causing the rotating block to press the chill; (6) Shoot sand into the mold and blow in curing agent; (7) After the sand core hardens, the push rod is shortened and the rotating block falls back to its original position; (8) Remove the block; (9) Remove the sand core.

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