CN108311648B - Balanced sand core bar of hollow balancing weight casting - Google Patents
Balanced sand core bar of hollow balancing weight casting Download PDFInfo
- Publication number
- CN108311648B CN108311648B CN201810318049.XA CN201810318049A CN108311648B CN 108311648 B CN108311648 B CN 108311648B CN 201810318049 A CN201810318049 A CN 201810318049A CN 108311648 B CN108311648 B CN 108311648B
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- CN
- China
- Prior art keywords
- core bar
- semicircular
- straight
- round platform
- straight core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000005266 casting Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 238000003466 welding Methods 0.000 claims abstract description 5
- 239000011258 core-shell material Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/106—Vented or reinforced cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a balance sand core bar of a hollow balancing weight casting, which comprises 2 symmetrical semicircular core bars and a straight core bar, wherein the semicircular core bars are formed by welding semicircular round steel and a cylindrical positioning block, both ends of the straight core bar are provided with round table circumferential surfaces and anti-rotation positioning surfaces and are formed by processing round steel, the cylindrical positioning block is provided with an inner round table circumferential surface and an inner anti-rotation positioning surface, the round table circumferential surfaces and the anti-rotation positioning surfaces of the straight core bar are in clearance fit with the inner round table circumferential surfaces and the inner anti-rotation positioning surfaces of the cylindrical positioning block, and the semicircular core bar is in radial anti-rotation positioning and axial movable connection with the straight core bar through the cylindrical positioning block and is positioned on a horizontal plane. The invention has simple structure and convenient manufacture, and when the casting shakeout is cleaned, the straight core bars automatically drop, and the semicircular core bars are conveniently taken out from the casting cavity, so that the core bars do not need to be cut, and the casting shakeout device can be repeatedly used, thereby simplifying the operation and saving the cost.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a balance sand core bar of a hollow balancing weight casting.
Background
The balancing weight is an important part in the engine of the excavating machine, plays a role in damping and balancing the engine, has the structural characteristics of hollowness and uniform wall thickness, and has a large cavity of the casting and only a small cylindrical outlet, so that according to the structural characteristics of the casting, a two-piece resin sand molding core making process is adopted for improving the productivity and ensuring the quality of the casting.
Because balancing weight foundry goods psammitolite is balanced psammitolite structure, in order to guarantee psammitolite intensity, there is higher requirement to the core skeleton, and the core skeleton that uses in common is with the screw steel of stipulated size or round steel welding together to form the special core skeleton that production needs, when the clearance foundry goods of follow-up shakeout, hollow foundry goods inner chamber core skeleton is difficult to wholly directly take out, need cut apart the core skeleton in order to separate the body and take out, complex operation, intensity of labour is high, has increased manufacturing cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a balance sand core bar of a hollow balancing weight casting.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: comprises 2 symmetrical semicircular core bars and a straight core bar, and is characterized in that: the semicircular core bar is formed by welding semicircular round steel and a cylindrical positioning block, two ends of the straight core bar are provided with round platform circumferential surfaces and anti-rotation positioning surfaces and are formed by processing round steel, the cylindrical positioning block is provided with an inner round platform circumferential surface and an inner anti-rotation positioning surface, the round platform circumferential surfaces and the anti-rotation positioning surfaces of the straight core bar are in clearance fit with the inner round platform circumferential surfaces and the inner anti-rotation positioning surfaces of the cylindrical positioning block, and the semicircular core bar is in radial anti-rotation positioning and axial movable connection with the straight core bar through the cylindrical positioning block and is in a horizontal plane.
Preferably, the fit clearance between the round platform peripheral surface and the rotation preventing locating surface of the straight core bar and the inner round platform peripheral surface and the inner rotation preventing locating surface of the cylindrical locating block is less than or equal to 1mm, the fit length is 20-30mm, and the taper of the round platform is 2-4 degrees.
Compared with the prior art, the invention has the beneficial effects that:
The invention has simple structure and convenient manufacture, improves the strength of the balanced sand core, and when the casting shakeout is cleaned, the straight core bars automatically drop, and the semicircular core bars are convenient to take out from the casting cavity, thereby not cutting the core bars, being capable of being repeatedly used, simplifying the operation and saving the cost.
Drawings
FIG. 1 is a cross-sectional view of a balance core bar structure of a hollow balancing weight casting of the invention;
FIG. 2 is an exploded front view of the core bar engagement;
FIG. 3 is a top view of FIG. 2;
Fig. 4 is a cross-sectional view of a balanced sand core structure including a core bar.
Wherein, 1-core bar; 2-straight core bar; 21-round table circumference; 22-an anti-rotation positioning surface; 3-semicircular core bars; 4-a cylindrical positioning block; 41-the inner circumferential surface of the circular table; 42-inner anti-rotation positioning surface; 5-sand core; 6, casting.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Referring to fig. 1,2 and 3, the balanced sand core bar of the hollow balancing weight casting provided by the embodiment of the invention comprises 2 symmetrical semicircular core bars 3 and a straight core bar 2.
The semicircular core bar 3 is formed by welding semicircular round steel and a cylindrical positioning block, two ends of the straight core bar 2 are provided with round platform peripheral surfaces 21 and anti-rotation positioning surfaces 22, the taper of the round platform is 3 degrees, and the semicircular core bar is formed by processing round steel. The cylindrical positioning block 4 is provided with an inner circular table circumferential surface 41 and an inner rotation preventing positioning surface 42, and the conical degree of the circular table is 3 degrees.
The round platform peripheral surface 21 and the anti-rotation positioning surface 22 of the straight core bar 2 are matched with the inner round platform peripheral surface 41 and the inner anti-rotation positioning surface 42 of the cylindrical positioning block 4, the matching clearance is 0.5mm, the matching length is 25mm, and the semicircular core bar 3 is in radial anti-rotation positioning and axial movable connection with the straight core bar 2 through the cylindrical positioning block 4 and is positioned on a horizontal plane, so that the core making operation is facilitated.
As shown in fig. 1 and fig. 4, in the embodiment of the present invention, a molding core-making process of a hollow balancing weight casting 6, one mold with two pieces, adopts furan resin sand molding core-making, and is provided with an integral connected cavity sand core 5.
The two annular sand cores are symmetrically distributed, the two semicircular core bars 3 are symmetrically distributed, the strength of the balanced sand core 5 is improved, the straight core bars 2 and the two semicircular core bars 3 are radially and rotatably positioned and axially movably connected, when the casting 6 shakeout is cleaned, the straight core bars 2 automatically fall off, and the semicircular core bars 3 are conveniently taken out of the cavity of the casting 6, so that the core bars do not need to be cut, the operation procedure is simplified, and the production cost is reduced.
Claims (2)
1. The utility model provides a balanced psammitolite core bar of hollow balancing weight foundry goods, includes 2 symmetrical semicircle core bars (3) and a straight core bar (2), its characterized in that: the semicircular core bar (3) is formed by welding semicircular round steel and a cylindrical positioning block (4), two ends of the straight core bar (2) are provided with a round platform circumferential surface (21) and an anti-rotation positioning surface (22), the round platform taper of the straight core bar is 3 degrees, the straight core bar is formed by processing round steel, the cylindrical positioning block (4) is provided with an inner round platform circumferential surface (41) and an inner anti-rotation positioning surface (42), the round platform taper of the straight core bar (2) is 3 degrees, the round platform circumferential surface (21) and the anti-rotation positioning surface (22) of the straight core bar (2) are in clearance fit with the inner round platform circumferential surface (41) and the inner anti-rotation positioning surface (42) of the cylindrical positioning block (4), and the semicircular core bar (3) is in radial anti-rotation positioning and axial movable connection with the straight core bar (2) through the cylindrical positioning block (4), and the 2 symmetrical semicircular core bars (3) and the straight core bar (2) are in a horizontal plane.
2. A balanced core-shell of a hollow weight casting according to claim 1, wherein: the fit clearance between the round platform circumferential surface (21) and the rotation preventing locating surface (22) of the straight core bar (2) and the inner round platform circumferential surface (41) and the inner rotation preventing locating surface (42) of the cylindrical locating block (4) is less than or equal to 1mm, and the fit length is 20-30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810318049.XA CN108311648B (en) | 2018-04-10 | 2018-04-10 | Balanced sand core bar of hollow balancing weight casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810318049.XA CN108311648B (en) | 2018-04-10 | 2018-04-10 | Balanced sand core bar of hollow balancing weight casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108311648A CN108311648A (en) | 2018-07-24 |
| CN108311648B true CN108311648B (en) | 2024-05-14 |
Family
ID=62896336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810318049.XA Active CN108311648B (en) | 2018-04-10 | 2018-04-10 | Balanced sand core bar of hollow balancing weight casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108311648B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118253707B (en) * | 2024-05-31 | 2024-09-27 | 阜新力达钢铁铸造有限公司 | Hidden core bar of machine tool casting |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1477282A (en) * | 1965-07-30 | 1967-04-14 | Amsted Ind Inc | Molding device |
| JP2004324790A (en) * | 2003-04-25 | 2004-11-18 | Ricoh Co Ltd | Roller member, fixing roller core bar, fixing roller, fixing device and image formation device |
| CN201455187U (en) * | 2009-06-03 | 2010-05-12 | 郧西精诚汽配有限公司 | Sand core structure of double-airway exhaust pipe casting |
| CN202715785U (en) * | 2012-08-20 | 2013-02-06 | 桐乡合德机械有限公司 | Combined type core bar used for long and thin hole casting |
| CN103773982A (en) * | 2012-10-24 | 2014-05-07 | 大田精密工业股份有限公司 | Counter weight block alloy of golf head and manufacturing method thereof |
| CN208083361U (en) * | 2018-04-10 | 2018-11-13 | 溧阳市联华机械制造有限公司 | A kind of balance sand core rod of hollow clump weight casting |
-
2018
- 2018-04-10 CN CN201810318049.XA patent/CN108311648B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1477282A (en) * | 1965-07-30 | 1967-04-14 | Amsted Ind Inc | Molding device |
| JP2004324790A (en) * | 2003-04-25 | 2004-11-18 | Ricoh Co Ltd | Roller member, fixing roller core bar, fixing roller, fixing device and image formation device |
| CN201455187U (en) * | 2009-06-03 | 2010-05-12 | 郧西精诚汽配有限公司 | Sand core structure of double-airway exhaust pipe casting |
| CN202715785U (en) * | 2012-08-20 | 2013-02-06 | 桐乡合德机械有限公司 | Combined type core bar used for long and thin hole casting |
| CN103773982A (en) * | 2012-10-24 | 2014-05-07 | 大田精密工业股份有限公司 | Counter weight block alloy of golf head and manufacturing method thereof |
| CN208083361U (en) * | 2018-04-10 | 2018-11-13 | 溧阳市联华机械制造有限公司 | A kind of balance sand core rod of hollow clump weight casting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108311648A (en) | 2018-07-24 |
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