CN105215293B - Bend sand box mold weight mechanism with self-locking function - Google Patents
Bend sand box mold weight mechanism with self-locking function Download PDFInfo
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- CN105215293B CN105215293B CN201510690022.XA CN201510690022A CN105215293B CN 105215293 B CN105215293 B CN 105215293B CN 201510690022 A CN201510690022 A CN 201510690022A CN 105215293 B CN105215293 B CN 105215293B
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- sand
- bend
- sand box
- weight mechanism
- guide pillar
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Abstract
The invention relates to a fixing device for casting, in particular to a bend sand box mold weight mechanism with the self-locking function. The bend sand box mold weight mechanism comprises a sand box and a sand shell located in the sand box. A horn-shaped casting cup is arranged above the sand shell. Vertical cylindrical guide columns are arranged on the two sides of the sand shell. A pressing board is arranged below the casting cup. The guide columns are in clearance connection with L-bend-shaped mold weights respectively. The sides of the mold weights are arranged transversely and longitudinally, through holes are formed in the transverse sides, the guide columns are sleeved with the through holes respectively, and the tail ends of the mold weights are in contact connection with the portions above the pressing board; and the mass of the longitudinal sides is larger than that of the transverse sides, the longitudinal sides are arranged downwards, the gravity centers of the mold weights are located on the outer sides of the axes of the guide columns, and the distances between the gravity centers and the axes of the guide columns are smaller than half of the distances between the contact points of the transverse sides and the pressing board and the axes of the guide columns. By the adoption of the bend sand box mold weight mechanism, the self-locking principle and the simple structure are used for fixing the sand shell in the sand box, the sand shell can be locked more firmly through acting force generated by expansion of molten metal in the casting process, and the bend sand box mold weight mechanism is extremely simple in structure, low in cost and easy to implement.
Description
Technical field
The present invention relates to casting processing fixing device is and in particular to a kind of bent angle shape sandbox foundary weight with auto-lock function
Mechanism.
Background technology
In casting manipulations, the use of arenaceous shell and sandbox is quite extensive, needs mould after arenaceous shell assembles
It is arranged on filling precoated sand in sandbox, and is compressed with fixing device, arenaceous shell is frangible, be therefore easy to rupture when fixing and cause
Molten metal is made to reveal.The problem that casting industry precoated sand is encountered with arenaceous shell compressing method at present has：1st, due to the molten iron in casting
Buoyancy is very big, foundary weight is light to produce floating, rise case, and ballast easily damages arenaceous shell or defeated and dispersed in advance in cast by pressure；2nd, use gluing
The method of bonding, time-consuming, high cost, easy to crack, unreliable；3rd, use screw clamp plate method, elastic bad control, take a lot of work, easily
Viscous iron, bad cleaning；4th, use wedge clamping method：Can loosen when burying case back-up sand vibrations, easily lose efficacy, fixture processing difficulties, investment
Greatly.Additionally, also useful other all kinds of clampings, compression method all do not obtain more satisfactory, more efficiently effect.
Content of the invention
The present invention be solve at present a variety of compressing method high costs, complex operation, easily arenaceous shell is caused to damage, poor reliability
Problem, provide a kind of easy and simple to handle, fixing reliability and enable the bent angle shape sandbox foundary weight mechanism of self-locking.
The present invention employs the following technical solutions realization, a kind of bent angle shape sandbox foundary weight mechanism with auto-lock function, including
Sandbox and be located at arenaceous shell within sandbox, the top of arenaceous shell is provided with flaring cup, and the both sides of described arenaceous shell are provided with perpendicular
Straight cylindrical guides, the lower section of cup is provided with pressing plate；On described guide pillar, gap connects the foundary weight of L bent angle shape, foundary weight respectively
Side respectively horizontal and vertical setting, being respectively equipped with widthwise edge be sleeved on through hole on guide pillar, the top of end and pressing plate
Contact connects；Longitudinal edge quality is more than the quality of widthwise edge and down-set.
Further, the center of gravity of described foundary weight is located at the outside of guide pillar axis, and center of gravity is less than with guide pillar axial line distance
Widthwise edge and pressing plate contact point are to the half of guide pillar axial line distance.
Further, described pressing plate is rectangular configuration, and the width of described widthwise edge is more than the width of pressing plate.
The invention has benefit that utilizing the principle of self-locking and enough being realized to the sand in sandbox by simple structure
The fixing purpose of shell, it is to avoid traditional fixed form manually afterburning fixing damage for arenaceous shell, when pouring, molten metal is swollen
The active force of swollen generation can make that locking is more firm, and structure is extremely simple, low cost and implement easily, and operation is time saving and energy saving, plus
Gu effect is good, it is suitable for promoting the use of in all kinds of Foundry Works.
Brief description
Fig. 1 main structure diagram of the present invention；
Fig. 2 overlooking the structure diagram of the present invention；
Fig. 3 self-lock mechanism of the present invention illustrates schematic diagram；
Stress diagram when Fig. 4 present invention uses.
In figure, 1. sandbox base, 2. arenaceous shell, 3. guide pillar, 4. foundary weight, 5. cup, 6. pressing plate.
Specific embodiment
The present invention is further elaborated below in conjunction with the accompanying drawings.
As depicted in figs. 1 and 2, a kind of bent angle shape sandbox foundary weight mechanism with auto-lock function that the present invention provides, arenaceous shell 2
Inside sandbox, the both sides of arenaceous shell 2 are provided with the cylindrical guides 3 being fixed on sandbox base 1, and the height of guide pillar 3 is higher than sand
The upper end of shell 2.The sprue gate of arenaceous shell 2 is above, is provided with the hone gate cup 5 of upward opening, cup 5 above sprue gate
Lower section be provided with the pressing plate 6 of rectangle.The foundary weight 4 of L bent angle shape is respectively installed with guide pillar 3, two sides of foundary weight 4 respectively levels and
Down-set, two side weight of foundary weight 4, the longitudinal edge quality positioned at guide pillar 3 outside is more than the quality of widthwise edge.Foundary weight
4 through hole being provided with the cooperation of guide pillar 3 gap, widthwise edge contacts setting with pressing plate 6.
When the present invention is implemented, put into after arenaceous shell 2 is assembled between two guide pillars 3 of sandbox base 1, adjust arenaceous shell
The distance between 2 and guide pillar 3, then pressing plate 6 and cup 5 are successively set on the top of arenaceous shell 2, finally foundary weight 4 is placed on
So as to the overlying contact of widthwise edge and pressing plate 6 on guide pillar 3, longitudinal edge is down-set.
As shown in Figure 3 and Figure 4, the schematic diagram of self-locking of the present invention, when foundary weight slides on guide pillar, always have certain between
Gap.It is enclosed within the presence of stirring power P and wants run-off the straight, 2 points of A, B of set is contacted with axle.Set up coordinate system and go out mechanical balance side by side
Equation：
∑x=0 NB-NA=0
∑y=0 P-FA+FB=0
∑Mo=0 P*a+NB*b-FB*d/2-FA*d/2=0
Obtained by static friction law：
FA=NA*f
FB=NB*f
Wherein f is the coefficient of friction of object；
It is more than simultaneous that five formulas solve equation：(this formula is the critical point of friction self-locking to a=b/2f）.
The a if guarantee foundary weight is not stuck<B/2f,
If ensureing the motionless a of foundary weight>b/2f；
Thus platen design can be become bent angle shape, the gravity of widthwise edge is Q1, and the gravity of longitudinal edge is Q2, with joint efforts in Q
Place.Q is made near the center line of hole axle during design（Axis）, a value is much smaller than b/2f critical point.
It may appear that three kinds of situations during enforcement：
Situation one：When not having resistance, pressing plate, in the presence of Q with joint efforts, can glide always；
Situation two：When being subject to resistance N on the right of pressing plate, stop gliding on the right side of pressing plate, left side meeting in the presence of gravity Q2
Continue to glide, a value of Q2 is less than critical point, and makes hole run-off the straight on axle, gap eliminates, to downslide motionless till；
Situation three：The N power on right side（Molten metal expands buoyancy）Continue in any case to increase, face because a value of N power is much larger than
Boundary's point, a>B/2f, so pressure board stubbornly refuses to move, will not opposite direction slide.
When actually used, sandbox can constantly shake during back-up sand, and so that whole fixing device is tended towards stability,
During later stage cast, this poised state can keep.
Claims (3)
1. a kind of bent angle shape sandbox foundary weight mechanism with auto-lock function, including sandbox and positioned at the arenaceous shell within sandbox（2）,
Arenaceous shell（2）Top be provided with flaring cup（5）It is characterised in that described arenaceous shell（2）Both sides be provided with vertical cylinder
Shape guide pillar（3）, cup（5）Lower section be provided with pressing plate（6）；
Described guide pillar（3）Upper gap respectively connects the foundary weight of L bent angle shape（4）, foundary weight（4）Side horizontal and vertical respectively set
Put, being respectively equipped with widthwise edge is sleeved on guide pillar（3）Upper through hole, end and pressing plate（6）Overlying contact connect；Longitudinal edge matter
Amount is more than the quality of widthwise edge and down-set.
2. the bent angle shape sandbox foundary weight mechanism with auto-lock function according to claim 1 is it is characterised in that described foundary weight
（4）Center of gravity be located at guide pillar（3）The outside of axis, and center of gravity and guide pillar（3）Axial line distance is less than widthwise edge and pressing plate（6）Contact
Point arrives guide pillar（3）The half of axial line distance.
3. the bent angle shape sandbox foundary weight mechanism with auto-lock function according to claim 2 is it is characterised in that described pressing plate
（6）For rectangular configuration, the width of described widthwise edge is more than pressing plate（6）Width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510690022.XA CN105215293B (en) | 2015-10-23 | 2015-10-23 | Bend sand box mold weight mechanism with self-locking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510690022.XA CN105215293B (en) | 2015-10-23 | 2015-10-23 | Bend sand box mold weight mechanism with self-locking function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105215293A CN105215293A (en) | 2016-01-06 |
| CN105215293B true CN105215293B (en) | 2017-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510690022.XA Expired - Fee Related CN105215293B (en) | 2015-10-23 | 2015-10-23 | Bend sand box mold weight mechanism with self-locking function |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107639211B (en) * | 2017-10-11 | 2019-01-11 | 上海宝钢铸造有限公司 | A kind of weight device and weight method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB468696A (en) * | 1936-01-06 | 1937-07-06 | Winget Ltd | Improvements in or relating to means for clamping in position the loose walls of mould boxes |
| CN2336895Y (en) * | 1998-07-06 | 1999-09-08 | 王彤 | Sand-mould compressing iron clamping apparatus |
| JP2007313516A (en) * | 2006-05-23 | 2007-12-06 | Sintokogio Ltd | Jig for clamping casting mold |
| CN103962502A (en) * | 2013-01-28 | 2014-08-06 | 重庆三柴发动机制造股份有限公司 | Method for negative pressure casting of cylinder body and foamed plastic mould |
| CN103769547B (en) * | 2014-02-26 | 2016-02-17 | 苏州明志科技有限公司 | For the self-floating foundary weight of spacing core assembly pouring device |
| CN205032651U (en) * | 2015-10-23 | 2016-02-17 | 临沂大学 | Bent angle shape sand box foundary weight mechanism with self -locking function |
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| CN105215293A (en) | 2016-01-06 |
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Granted publication date: 20170208 Termination date: 20171023 |
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| CF01 | Termination of patent right due to non-payment of annual fee |