Sand core structure for casting water jacket of automobile engine cylinder body

Abstract

The utility model discloses a sand core structure for an automobile engine cylinder block casting water jacket, and relates to the technical field of water jacket manufacturing. The utility model provides a sand core structure for a casting water jacket of an automobile engine cylinder block, which comprises a sand core base, a sand core and a sand core, the first water jacket sand core and the second water jacket sand core are arranged on the sand core base; wherein the first water jacket sand core is provided with at least one first groove, and the second water jacket sand core is provided with at least one second groove; the first groove and the second groove are buckled to form a cylindrical space, and a connecting rib is arranged between the first water jacket sand core and the second water jacket sand core; the first water jacket sand core and / or the second water jacket sand core can be bonded with the bonding surface, and after bonding, the connecting rib can be damaged, so that the connecting state of the first water jacket sand core and the second water jacket sand core is relieved.

Description

TECHNICAL FIELD

[0001] The application relates to the water jacket manufacturing technical field, in particular to a sand core structure for casting a water jacket of an automobile engine cylinder body. BACKGROUND

[0002] The water jacket in an automobile engine is a porous water pipe. When cooling water circulating from a water tank reaches the engine, if there is only one water outlet, the cooling effect will be relatively concentrated, and the effect is better near the water outlet and worse far away from the water outlet. Therefore, the cooling effect of the whole engine is relatively balanced by letting the cold water flow out of multiple holes, so as to prolong the service life of the engine.

[0003] The water jacket is used to transfer the heat energy of the engine combustion chamber and the inner wall of the cylinder body to the cooling liquid through heat conduction. Since the liquid is flowable, the cooling liquid is circulated to the radiator by the water pump, and the radiator dissipates heat to the cooling liquid through the flow of external air. The cooled cooling liquid is circulated to the engine water jacket to receive the heat generated by the engine during operation, and the cycle is repeated. In the prior art, two split water jacket sand cores are usually used to manufacture the water jacket. However, the position deviation between the two water jacket sand cores easily occurs, which leads to uneven wall thickness of the water jacket cavity and over-thickness of the cylinder hole. CONTENT OF THE INVENTION

[0004] The main purpose of the application is to provide a sand core structure for casting a water jacket of an automobile engine cylinder body, which aims to solve the technical problems of position deviation between two water jacket sand cores in the prior art, uneven wall thickness of the water jacket cavity, and over-thickness of the cylinder hole.

[0005] To achieve the above-mentioned purpose, the application provides a sand core structure for casting a water jacket of an automobile engine cylinder body, which comprises:

[0006] The sand core base has at least one bonding surface;

[0007] The first water jacket sand core and the second water jacket sand core are arranged on the sand core base;

[0008] The first water jacket sand core has at least one first groove, and the second water jacket sand core has at least one second groove;

[0009] The first groove and the second groove are engaged to form a cylindrical space, and a connecting rib is arranged between the first water jacket sand core and the second water jacket sand core;

[0010] The first water jacket sand core and / or the second water jacket sand core can be bonded with the bonding surface, and after bonding, the connecting rib can be damaged to release the connection state of the first water jacket sand core and the second water jacket sand core.

[0011] Optionally, the first water jacket sand core has first positioning surfaces on both sides of the first grooves, and the second water jacket sand core has second positioning surfaces on both sides of the second grooves; the first positioning surfaces are oppositely arranged with the second positioning surfaces, and both ends of the connecting rib are connected with the first positioning surfaces and the second positioning surfaces, respectively.

[0012] Optionally, the first water jacket sand core has three first grooves arranged in the same direction, and the second water jacket sand core has second grooves corresponding to the first grooves one by one; adjacent first grooves share one first positioning surface, and adjacent second grooves share one second positioning surface.

[0013] Optionally, the first positioning surfaces and the second positioning surfaces have a communication gap therebetween, and adjacent cylindrical spaces are communicated through the communication gap.

[0014] Optionally, the first positioning surfaces and the second positioning surfaces between adjacent cylindrical spaces are connected with each other through the connecting rib, and the distance between the first positioning surfaces and the second positioning surfaces gradually increases in the direction of both ends by the position of the connecting rib.

[0015] Optionally, the lower ends of the first water jacket sand core and the second water jacket sand core are provided with positioning protrusions, and the sand core base is provided with positioning grooves for cooperating with the positioning protrusions.

[0016] Optionally, the height of the positioning protrusion is greater than the depth of the positioning groove.

[0017] Optionally, the upper end of the sand core base is provided with at least one fixing block, and the fixing block is provided with the bonding surface.

[0018] Optionally, the bonding surface is a curved surface, and the bonding surface is attached to the outer wall of the first water jacket sand core or the second water jacket sand core.

[0019] Optionally, the sand core base is provided with a containing groove corresponding to the cylindrical space, and the containing groove is provided with an annular protrusion in the middle.

[0020] The application can achieve the following beneficial effects:

[0021] This application proposes a sand core structure for casting water jackets in automotive engine cylinder blocks. By providing connecting ribs between a first and second water jacket sand core, the relative positions of the first and second water jacket sand cores are fixed. A mating surface is provided on the sand core base, which is used to bond the first and second water jacket sand cores, thereby fixing them and preventing positional deviations. After installing the first and second water jacket sand cores onto the sand core base, the connecting ribs are removed to avoid affecting subsequent water jacket casting. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the sand core structure according to an embodiment of this application;

[0023] Figure 2 This is a cross-sectional structural diagram of the sand core structure according to an embodiment of this application;

[0024] Figure 3 This is an exploded structural diagram of the sand core structure according to an embodiment of this application;

[0025] Figure 4 The first and second water jacket sand cores after the connecting ribs have been destroyed, as described in this application embodiment.

[0026] The numbers on the map are:

[0027] 10-Sand core base, 20-First water jacket sand core, 21-First groove, 22-First positioning surface, 30-Second water jacket sand core, 31-Second groove, 32-Second positioning surface, 40-Connecting gap, 50-Connecting rib, 60-Positioning protrusion, 61-Positioning groove, 70-Fixing block, 71-Matching surface, 80-Accommodation groove, 81-Annular protrusion.

[0028] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications will also change accordingly.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In addition, if the present application embodiments involve "first", "second" and the like, the "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions, for example, "A and / or B" includes A solution, or B solution, or A and B solution. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that ordinary skilled persons in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.

[0033] Embodiment 1

[0034] Reference Figures 1-4 The first embodiment of the present application provides a sand core structure for casting a water jacket of an automobile engine cylinder block, comprising: a sand core base 10, the sand core base 10 having at least one bonding surface 71; a first water jacket sand core 20 and a second water jacket sand core 30 arranged on the sand core base 10; wherein the first water jacket sand core 20 has at least one first groove 21, and the second water jacket sand core 30 has at least one second groove 31; the first groove 21 and the second groove 31 are engaged to form a cylindrical space, and a connecting rib 50 is arranged between the first water jacket sand core 20 and the second water jacket sand core 30; the first water jacket sand core 20 and / or the second water jacket sand core 30 can be bonded with the bonding surface 71, and after bonding, the connecting rib 50 can be damaged to release the connection state of the first water jacket sand core 20 and the second water jacket sand core 30.

[0035] In this embodiment, the first water jacket sand core 20 and the second water jacket sand core 30 are buckled to form a cylindrical space, which is the shape of the water jacket during pouring. The first groove 21 and the second groove 31 of the first water jacket sand core 20 and the second water jacket sand core 30 are provided with through holes. The connecting rib 50 arranged between the first water jacket sand core 20 and the second water jacket sand core 30 serves to fix the relative positions of the first water jacket sand core 20 and the second water jacket sand core 30 when the water jacket sand core is installed on the sand core base 10, so that the relative positions of the first water jacket sand core 20 and the second water jacket sand core 30 will not change during installation on the sand core base 10, avoiding position deviation of the first water jacket sand core 20 and the second water jacket sand core 30, resulting in uneven wall thickness of the water jacket cavity and over-thickness of the cylinder hole wall. The first water jacket sand core 20, the second water jacket sand core 30 and the connecting rib 50 can be made by shooting. The connecting rib 50 can be a weak and easily broken structure, and the first water jacket sand core 20 and the second water jacket sand core 30 are bonded to the bonding surface 71 on the sand core base 10 by an adhesive. After the first water jacket sand core 20 and the second water jacket sand core 30 are arranged on the sand core base 10, the connecting rib 50 can be removed by a saw blade or a file to avoid affecting the subsequent water jacket pouring forming. When the sand core base 10 is provided with one bonding surface 71, the bonding surface 71 can be connected with the outer wall of the first water jacket sand core 20 or the second water jacket sand core 30; when the sand core base 10 is provided with at least two bonding surfaces 71, the two bonding surfaces 71 can be connected with the first water jacket sand core 20 and the second water jacket sand core 30 respectively.

[0036] During the water jacket pouring process:

[0037] Sand core preparation: prepare the sand core base 10, the first water jacket sand core 20 and the second water jacket sand core 30 according to the design requirements, and ensure that the size, shape and surface quality of all parts meet the standard.

[0038] Sand core assembly: accurately align and assemble the first water jacket sand core 20 and the second water jacket sand core 30 together through the connecting piece to form a complete cylindrical space. Then, place the assembled sand core on the sand core base 10 and bond it to the bonding surface 71 through an adhesive. After the interface between the first water jacket sand core 20 and / or the second water jacket sand core 30 and the sand core base 10 is bonded by the adhesive, remove the connecting rib 50.

[0039] Casting preparation: place the assembled sand core structure into the casting mold and prepare the casting material (such as metal liquid).

[0040] Casting process: pour the metal liquid into the mold, and the metal liquid will fill the cylindrical space formed by the sand core during the cooling process to form the preliminary shape of the water jacket. At the same time, the sand core serves as a temporary support structure to ensure the shape and size of the flow channel inside the water jacket.

[0041] Sand core separation and cleaning: After casting is completed, the sand core residue is removed from the finished cylinder body, and the water jacket is cleaned and processed as necessary.

[0042] Subsequent processing: The water jacket undergoes necessary inspection, repair, and surface treatment to ensure it meets usage requirements. Ultimately, the water jacket will serve as a crucial component of the engine block, undertaking the vital task of cooling the engine and ensuring its normal operation.

[0043] Example 2

[0044] As an optional implementation, this embodiment provides a specific structure for the connecting rib 50, including: a first water jacket sand core 20 having a first positioning surface 22 located on both sides of a first groove 21, and a second water jacket sand core 30 having a second positioning surface 32 located on both sides of a second groove 31; the first positioning surface 22 and the second positioning surface 32 are arranged opposite to each other, and the two ends of the connecting rib 50 are respectively connected to the first positioning surface 22 and the second positioning surface 32.

[0045] Specifically, the first groove 21 and the second groove 31 are semi-circular groove structures. The extension direction of the cylindrical space formed by the first groove 21 and the second groove 31 is vertical. When only one first groove 21 and one second groove 31 are provided, after the first groove 21 and the second groove 31 are connected to form a cylindrical space, a connecting rib 50 is provided on the left and right sides of the cylindrical space respectively. The first groove 21 and the second groove 31 extend in an arc shape along the horizontal direction. Two first positioning surfaces 22 are set at the left and right ends of the first groove 21. The two first positioning surfaces 22 on the first water jacket sand core 20 and the two positioning surfaces on the second water jacket sand core 30 are set opposite to the first positioning surfaces 22. The connecting rib 50 is set between the first positioning surface 22 and the second positioning surface 32, that is, the connecting rib 50 is set in the wall space of the first groove 21 and the second groove 31 to ensure that the connecting rib 50 can connect the first water jacket sand core 20 and the second water jacket sand core 30, and to facilitate the subsequent destruction of the connecting rib 50 to release the connection between the first water jacket sand core 20 and the second water jacket sand core 30. After removing the connecting rib 50, it is also to avoid the connecting rib 50 affecting the subsequent water jacket casting and molding.

[0046] Optionally, the first water jacket sand core 20 has three first grooves 21 arranged in the same direction, and the second water jacket sand core 30 has second grooves 31 that correspond one-to-one with the first grooves 21. Adjacent first grooves 21 share a first positioning surface 22, and adjacent second grooves 31 share a second positioning surface 32.

[0047] Specifically, such as Figure 1The diagram shows a first water jacket sand core 20 and a second water jacket sand core 30 with three grooves. Taking the first water jacket sand core 20 as an example, the three first grooves 21 of the first water jacket sand core 20 extend horizontally. Through holes are provided through the side walls of the first water jacket sand core 20 and the second water jacket sand core 30.

[0048] Optionally, a connecting gap 40 is provided between the first positioning surface 22 and the second positioning surface 32, through which adjacent cylindrical spaces are connected.

[0049] Optionally, the first positioning surface 22 and the second positioning surface 32 located between adjacent cylindrical spaces are connected to each other by a connecting rib 50, and the distance between the first positioning surface 22 and the second positioning surface 32 gradually increases from the position of the connecting rib 50 along the direction of both ends.

[0050] Specifically, such as Figure 2 As shown, the connecting rib 50 is positioned at the midpoint of the first positioning surface 22 and the second positioning surface 32 in the height direction. The gap between the first positioning surface 22 and the second positioning surface 32 gradually increases from the position of the connecting rib 50 in the upward or downward direction. This ensures that the connecting rib 50 is positioned at the point where the gap between the first positioning surface 22 and the second positioning surface 32 is minimized, thereby improving the length of the connecting rib 50, enhancing its structural stability, and facilitating the faster removal of the connecting rib 50 after the first water jacket sand core 20 and the second water jacket sand core 30 are installed on the sand core base 10.

[0051] Example 3

[0052] As an optional implementation, this embodiment provides a specific connection structure between the water jacket sand core and the sand core base 10, including: the lower end of the first water jacket sand core 20 and the second water jacket sand core 30 is provided with a positioning protrusion 60, and the sand core base 10 has a positioning groove 61 for cooperating with the positioning protrusion 60.

[0053] Specifically, by setting multiple positioning protrusions 60 at the lower ends of the first water jacket sand core 20 and the second water jacket sand core 30, and setting positioning grooves 61 on the sand core base 10 that correspond one-to-one with the positioning protrusions 60, the first water jacket sand core 20 and the second water jacket sand core 30 can be quickly positioned.

[0054] Optionally, the height of the positioning protrusion 60 is greater than the depth of the positioning groove 61.

[0055] Optionally, at least one fixing block 70 is provided at the upper end of the sand core base 10, and the fixing block 70 is provided with a mating surface 71.

[0056] Optionally, the mating surface 71 is a curved surface, and the mating surface 71 is in contact with the outer wall of the first water jacket sand core 20 or the second water jacket sand core 30.

[0057] Optionally, the sand core base 10 is provided with a receiving groove 80 corresponding to the cylindrical space, and the middle part of the receiving groove 80 is provided with an annular protrusion 81.

[0058] By setting the positioning block, the positioning block protrudes from the upper end surface of the sand core base 10, so that the bonding surface 71 on the fixing block 70 can be bonded with the outer wall of the first water jacket sand core 20 or the second water jacket sand core 30. The bonding surface 71 is a curved surface, which can better match the arc-shaped outer wall of the first water jacket sand core 20 or the second water jacket sand core 30, thereby improving the stability of the bonding.

[0059] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A sand core structure for casting water jackets in automobile engine cylinder blocks, characterized in that, The application relates to a sand core base, a first water jacket sand core and a second water jacket sand core. The first water jacket sand core has at least one first recess, and the second water jacket sand core has at least one second recess. The first recess and the second recess are combined to form a cylindrical space, and a connecting rib is arranged between the first water jacket sand core and the second water jacket sand core. The first water jacket sand core and / or the second water jacket sand core can be bonded with the bonding surface, and after bonding, the connecting rib can be damaged to release the connection state of the first water jacket sand core and the second water jacket sand core. The first water jacket sand core has first positioning surfaces on both sides of the first recess, and the second water jacket sand core has second positioning surfaces on both sides of the second recess. The first positioning surfaces and the second positioning surfaces are oppositely arranged, and the two ends of the connecting rib are connected with the first positioning surfaces and the second positioning surfaces respectively.

2. The sand core structure for casting a water jacket of an automobile engine block according to Claim 1, wherein The first water jacket sand core has three first recesses arranged in the same direction, and the second water jacket sand core has second recesses corresponding to the first recesses one by one. The first positioning surfaces and the second positioning surfaces have a communication gap therebetween, and adjacent cylindrical spaces are communicated through the communication gap.

3. The sand core structure for casting the water jacket of an automobile engine block according to Claim 2, wherein The first positioning surfaces and the second positioning surfaces between adjacent cylindrical spaces are connected with each other through the connecting rib, and the distance between the first positioning surfaces and the second positioning surfaces gradually increases in the direction of the two ends by the position of the connecting rib.

4. The sand core structure for casting the water jacket of an automobile engine block according to Claim 3, wherein The lower ends of the first water jacket sand core and the second water jacket sand core are provided with positioning protrusions, and the sand core base is provided with positioning grooves matched with the positioning protrusions.

5. The sand core structure for casting the water jacket of an automobile engine block according to Claim 3, wherein The height of the positioning protrusion is greater than the depth of the positioning groove.

6. The sand core structure for casting the water jacket of an automobile engine block according to Claim 1, wherein The upper end of the sand core base is provided with at least one fixing block, and the fixing block is provided with the bonding surface.

7. The sand core structure for casting the water jacket of an automobile engine block according to Claim 6, wherein The bonding surface is a curved surface, and the bonding surface is matched with the outer wall of the first water jacket sand core or the second water jacket sand core.

8. The sand core structure for casting the water jacket of an automobile engine block according to Claim 3, wherein The sand core base is provided with a containing groove corresponding to the cylindrical space, and the containing groove is provided with an annular protrusion in the middle.

9. The sand core structure for casting the water jacket of an automobile engine block according to Claim 8, wherein ​ 10. The sand core structure for casting the water jacket of an automobile engine block according to Claim 3, wherein ​

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