CN112719225A

CN112719225A - Sand core of lubricating oil cooler shell casting

Info

Publication number: CN112719225A
Application number: CN202011609786.9A
Authority: CN
Inventors: 程行东; 张红奇; 田鑫; 苏少静; 纳建虹
Original assignee: Kocel CSR Foundry Ltd
Current assignee: Kocel CSR Foundry Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-04-30

Abstract

The invention relates to a sand core of a shell casting of a lubricating oil cooler, which comprises a bottom lower core, an inner cavity core, a side core and an upper top end core; the inner cavity core is an integral core formed by combining a main body core, a 3# main body large core and a 2# main body core; the side core is provided with a 1# side core and a 2# side core; the lower end of the 3# main body large core is provided with a positioning core head matched with the bottom lower core; the bottom lower core is provided with a positioning snap fastener matched with the side core; the upper end of the 3# main body large core is provided with a positioning core print matched with the upper top end core; the mold core is vertically assembled; after the core is assembled, a plurality of combined buried boxes are adopted. The invention overcomes the problems of slag holes, air holes and shrinkage porosity caused by the existing casting method, has simple operation, solves the problems of fire leakage and quality defects of the casting, and improves the quality and production efficiency of the casting.

Description

Sand core of lubricating oil cooler shell casting

Technical Field

The invention relates to a casting sand core, in particular to a sand core of a lubricating oil cooler shell casting.

Background

The lubricating oil cooler shell casting is a long cylindrical shell casting, and the long cylindrical casting is produced in a parting and lying mode from the middle of the casting under the normal condition, so that the casting production operation is simple and convenient, the cost is saved, and the production efficiency is higher; however, several inner cavities of the shell casting are required to be completely processed and cannot have casting defects such as slag holes, air holes and shrinkage porosity, and the flat-lying production mode cannot meet the inherent quality requirement of the casting.

Disclosure of Invention

The invention overcomes the problems of slag holes, air holes and shrinkage porosity of the casting caused by the conventional casting method, provides the sand core of the casting of the lubricating oil cooler, has simple operation, solves the problem of quality defects of the casting, and improves the quality and the production efficiency of the casting.

The utility model provides a psammitolite of lubricating oil cooler casing foundry goods, adopts vertical core assembly casting process production, and the core of lubricating oil cooler casing foundry goods comprises 7 cores, and including bottom lower core, main part core, 2# main part core and the big core combination of 3# main part are the inner chamber core, and 1# limit core and 2# limit core are limit core, upper portion top core.

The core is designed from bottom to top as follows: the bottom lower core is a core at the lowest end, the whole body is square, a pouring system cross gate is arranged on the bottom lower core, and the bottom lower core is used for core assembly positioning of a 3# main body large core and a side core. The middle part on the core is provided with the location core head that matches with the big core of 3# main part under the bottom, fixes a position 3# main part big core, ensures the accuracy of size.

In order to better position 1# limit core, 2# limit core, set up the location box-and-spigot that matches with 1# limit core, 2# limit core under the bottom on the square frame of core, both guaranteed the size accuracy of foundry goods, reduced the degree of difficulty of the operation of mould assembling, simultaneously greatly reduced the risk of running a fire.

In order to prevent the core from making mistakes under 1# side core, 2# side core, one side of core location snap-fastener has set up positive and negative mistake proofing location platform under the bottom, has set up on 1# side core, 2# side core with the core under the bottom on the mistake proofing location platform snap-fastener that matches.

The 3# main body large core is a middle large core, and forms an inner cavity structure of the casting together with the main body core and the 2# main body core, and in order to simplify the operation, the main body core, the 2# main body core and the 3# main body large core form a whole, so that the core assembly operation is simplified, and the operation difficulty is reduced.

For the accuracy of casting structure, do not cause the skin thickness discrepancy, all be provided with the location core head at 3# main part big core both ends, the location core head of its lower part and the core head phase-match that sets up on the core under the bottom, the location core head of its upper portion and the location core head phase-match of upper portion top core, 3# main part big core and bottom core, upper portion top core have formed the whole of mutual location, have guaranteed the accurate precision of casting size.

1# limit core, 2# limit core are two blocks of limit cores, and core, core assembly are down in proper order according to the mistake proofing location structure of core under the bottom, set up the gating system sprue on the limit core, the alignment of core assembly in-process sprue and cross gate.

The upper top core is the topmost core, and a positioning core print of a 3# main body large core and a primary and secondary positioning groove matched with the 1# side core and the 2# side core are arranged on the upper top core; meanwhile, an air outlet hole is arranged on the top end core at the upper part.

In order to solve the casting defects of shrinkage porosity and slag porosity of the casting, a casting riser process is adopted, a cylindrical casting is directly made to be 150-200 mm long to serve as a riser of the casting, the operation is simplified, the effects of overflowing, deslagging, exhausting and feeding are achieved, and the defects of the slag porosity, shrinkage porosity and shrinkage porosity of the casting are effectively reduced; the accuracy of riser is improved, and the quality of casting is improved.

When the cores are assembled and embedded, in order to prevent the casting from running out in the pouring process and improve the production efficiency, a multi-piece combined embedding technology is adopted, a plurality of cores are embedded in one box, and 4 or 6 assembled cores are sleeved with a sand box and embedded in the box together. During the box-making, directly put the sand box and run sand, promoted efficiency reduce cost. In order to realize stable pouring and reduce the casting defects of slag vents, a bottom pouring type pouring system with a filter screen is adopted.

The sand core is produced by adopting a vertical core assembly process, the wall thickness of a casting is effectively controlled, and the positioning snap buttons are arranged on the core heads, so that the control of the key size of the casting is ensured; meanwhile, the problems of slag holes, air holes and shrinkage porosity of the casting are avoided. The invention adopts the casting riser process to simplify the operation, realize air outlet, slag discharge and feeding, and improve the casting quality. The positive and negative error-proofing positioning structure is adopted to prevent the core from deviating and dislocating and avoid the fire-running defect. The invention effectively improves the quality of the casting of the lubricating oil cooler shell, the qualification rate reaches more than 95 percent, the reject ratio of the casting is reduced, and the production efficiency is improved by 30 percent.

Drawings

FIG. 1: bottom core binding scheme

FIG. 2: schematic diagram of lumen core

FIG. 3: schematic diagram after edge core combination

FIG. 4: schematic diagram after core assembly

Wherein, the bottom lower core-1, the main body core-2, the 3# main body big core-3, the 2# main body core-4, the 1# side core-5, the 2# side core-6, the upper top core-7, the positioning core head-8, the horizontal runner-9, the vertical runner-10, the positioning male and female buckle-11, the positive and negative error-proof positioning platform-12, the air outlet hole-13

Detailed Description

In order to more clearly illustrate the technical solution of the present invention, the present invention is further described in detail with reference to the following specific examples. Note that the following described embodiments are illustrative only for explaining the present invention, and are not to be construed as limiting the present invention.

The first embodiment is as follows:

referring to fig. 1-4, the sand core of the shell casting of the lubricating oil cooler consists of 7 cores, including a bottom lower core 1, a main body core 2, a No. 2 main body core 4 and a No. 3 main body large core 3 which are combined into an inner cavity core, a No. 1 side core 5 and a No. 2 side core 6 which are side cores, and an upper top core 7.

As shown in fig. 1, the whole bottom core 1 is square, the bottom core 1 is provided with a runner 9 of a gating system, the middle part of the bottom core is provided with a positioning core head 8 matched with a 3# main body large core, positioning male and female buttons 11 matched with a 1# side core and a 2# side core are respectively arranged on a square frame of the bottom core, and a positive and negative error-proofing positioning table 12 is respectively arranged on one side of the positioning male and female buttons 11 of the bottom core.

As shown in figure 2, the 3# main body large core 3 is a middle large core, and the

main body cores

2 and 2# main body cores 4 are marked on the 3# main body large core 3 to form an integral inner cavity core of the casting together, so that the core assembling operation is simplified, and the operation difficulty is reduced. All be provided with the location core print at 3 both ends of 3# main part big core, the location core print that 3# main part big core 3's lower extreme set up with the bottom down the location core print 8 phase-matchs on the core, 3# main part big core 3 and bottom down core 1 form mutual location wholly, ensure foundry goods size accuracy.

As shown in fig. 3, after the core assembly of the inner cavity core and the bottom lower core is carried out by 1, the side core assembly is carried out, the 1# side core and the 2# side core are respectively provided with a female buckle of an anti-error positioning platform matched with a positive and negative anti-error positioning platform 12 on the bottom lower core 1, and the 1# side core is provided with a sprue 10. Alignment of the sprue 10 and runner 9 during core assembly.

As shown in fig. 4, the upper top core 7 is the topmost core, on which a positioning core print of the 3# main body large core and a primary and secondary positioning slot matched with the 1# side core and the 2# side core are arranged; and symmetrical air outlet holes 17 are arranged on the upper top end core 7.

The sand core can be produced by a vertical core assembly process, the wall thickness of a casting is effectively controlled, and the positioning snap buttons are arranged on the core heads to ensure the control of the key size of the casting; meanwhile, the problems of slag holes, air holes and shrinkage porosity of the casting are avoided.

Example two:

a core of a casing casting of a lubricating oil cooler is produced by adopting a core assembly vertical casting process in the casting production process, and the key size of the casting is ensured and the core assembly error is prevented by arranging snap fasteners on each core head for positioning.

In order to realize stable pouring and reduce the casting defects of slag vents, a bottom pouring type pouring system with a filter screen is adopted.

In order to overcome the defects of shrinkage porosity and slag porosity of castings, a casting riser technology is adopted, the height of the castings is 150-200 mm at most according to the height of the castings, the effects of overflowing, deslagging, exhausting and feeding are achieved, the defects of slag porosity and shrinkage porosity of the castings are effectively reduced, and finally the redundant parts of the castings are machined and removed in the machining process.

The process of burying a plurality of castings in one box is adopted, so that the castings are prevented from running out, and the production efficiency is improved. A multi-piece combined box burying process is adopted, 4 or 6 sand cores which are assembled are put together to sleeve a sand box for box burying, preferably, the arrangement of a flat bottom can be cancelled, the cores are directly put on a flat ground, the sand is directly discharged from the sand box, and the sand box is directly boxed after pouring and cooling, so that a process of bottoming by the sand box is omitted, the efficiency is improved, and the cost is reduced.

Although embodiments of the present invention have been shown and described, it is understood that the embodiments are illustrative and not restrictive, that various changes, modifications, substitutions and alterations may be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The sand core of the lubricating oil cooler shell casting is characterized by comprising a bottom lower core, an inner cavity core, a side core and an upper top core; the inner cavity core is an integral core formed by combining a 1# main body core, a 3# main body large core and a 2# main body core; the side core is provided with a 1# side core and a 2# side core; the lower end of the 3# main body large core is provided with a positioning core head matched with the bottom lower core; the bottom lower core is provided with a positioning snap fastener matched with the side core; the upper end of the 3# main body large core is provided with a positioning core print matched with the upper top end core; the mold core is vertically assembled; after the core is assembled, a plurality of combined buried boxes are adopted.

2. The sand core of a lubricating oil cooler shell casting of claim 1, wherein the bottom drag core is provided with runners.

3. The sand core of a lubricant cooler shell casting of claim 2, wherein the bottom cored setting is square.

4. The sand core of a lubricant cooler shell casting of claim 3, wherein the locating snap fasteners of the bottom lower core are disposed on a square rim of the bottom lower core.

5. The sand core of a casting for a cooler housing of lubricating oil of claim 4, wherein one side of the positioning snap fastener of the bottom core is provided with a positive and negative error-proofing positioning table.

6. The sand core of the casting of the lubricating oil cooler shell as claimed in claim 5, wherein the 1# side core and the 2# side core are provided with positioning table female and male buckles matched with the positive and negative error-proof positioning tables.

7. The method of casting a lubricant cooler shell casting of claim 6, wherein the edge core is provided with a sprue.

8. The sand core of a lubricant cooler shell casting of claim 7, wherein the upper top core is provided with snap-in locating slots matching the # 1 edge core and the # 2 edge core.

9. The sand core of a lubricant cooler shell casting of claim 1, wherein an air hole is provided in the upper tip core.

10. The sand core of a lubricating oil cooler housing casting according to claim 1, wherein the height of the lubricating oil cooler housing casting is 150-200 mm longer than the actual height.