CN211515981U - Runner sand mould structure - Google Patents

Abstract

The utility model discloses a pouring gate sand mold structure, wherein the pouring gate is vertically arranged on a front end surface sand core or a rear end surface sand core or a left outer shape or a right outer shape of a cylinder body sand mold, and the pouring gate is manufactured by a half-and-half mold opening method; the utility model discloses a water the structure and adopt the mode manufacturing of half-and-half die sinking to form, can part the two sides structure that will water respectively heat forming, reduce and water fashioned time to need not to use the mould stick, the mould is simpler, has avoided the mould stick when removing to extract, to the destruction of watering the cross-section, has avoided the trouble of mould stick part.

Description

Runner sand mould structure

Technical Field

The utility model relates to an engine cylinder body sand mould assembly technical field, especially a water sand mould structure.

Background

With the continuous improvement of the domestic investment casting technology, domestic casting enterprises not only need to manufacture high-quality investment castings, but also need to further improve the resource waste, the production efficiency and the yield.

The manufacturing of the traditional engine cylinder body sand mold has several defects, firstly, the farthest distance between the upper part of a pouring gate and a casting reaches more than 500mm, the sand quantity of the coated sand is seriously wasted, the sand mold is heavy, the resin consumption is large, the smoke is heavy, and the environmental protection is not facilitated; secondly, the opening section of the traditional pouring gate is in a hyperbolic shape which is closed inwards, when the pouring gate is cast and manufactured, mold rods respectively enter from two ends, then a heating pipe is inserted into the mold rods, and after precoated sand is heated and formed, the defects are obvious in actual production, the requirements on the manufacturing process are high, and the sand mold forming time is long; third, traditional cylinder body psammitolite is inside solid, and it is big with the sand volume, and the flue gas production volume is big, and when the heating tube heating was inserted at the middle part, the outside was heated inequality with inside, and inside temperature is high, and outside temperature is low, needs the fast operation of external heating to cooperate the internal heating, still will insert the thermometer real-time detection temperature simultaneously, and work efficiency is low, and the effect is relatively poor, is unfavorable for the thermoforming to make psammitolite weight great.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a utility model aim at: to the problem that above-mentioned exists, provide a water sand mould structure, through half die sinking heat forming water's mode, avoided traditional water well mould stick center heating mode and the heating that causes inhomogeneous, problem that the heat time is long through the mode that sets up the strengthening rib, improved the not high problem of steadiness of watering the sand mould.

The utility model adopts the technical scheme as follows: a pouring gate sand mold structure comprises a pouring gate, wherein the pouring gate is vertically arranged on a front end face sand core or a rear end face sand core of a cylinder body sand mold, and the pouring gate is manufactured by a half-and-half mold opening method.

Further, the sand mould structure comprises a front sand mould surface and a rear sand mould surface; the front sand molding surface is provided with a plurality of criss-cross reinforcing ribs which are mutually connected, and the front side surface of the sand mold where the pouring channel is arranged is provided with a supporting structure.

Further, be close to injecting glue mouth side on the back sand profile and be provided with connecting groove, connecting groove is the class cuboid structure.

Furthermore, one side of the connecting clamping groove close to the glue injection port is a gentle slope surface.

Furthermore, step-shaped lapping structures are arranged at the left edge and the right edge of the front sand molding surface, and each lapping structure comprises a first contact surface and a second contact surface; the first contact surface and the second contact surface are perpendicular to each other, and the first contact surface and the second contact surface are both in a curve-shaped structure around the pouring gate.

Furthermore, the first contact surface and the second contact surface are flush at the position close to the glue injection port, and the length of the first contact surface at the side far away from the glue injection port is longer than that of the second contact surface.

Further, the aperture of the pouring gate is gradually reduced from the side close to the glue injection port to the side far away from the glue injection port.

Further, the supporting structure comprises an upper supporting surface, a lower supporting surface, a supporting vertical surface and an auxiliary supporting surface; the area of the lower supporting surface is larger than that of the upper supporting surface, the supporting vertical surface is connected with the upper supporting surface and the lower supporting surface, and the auxiliary supporting surfaces are arranged along two sides of the supporting vertical surface.

Furthermore, a plurality of support columns are arranged on the front sand mold surface, and the support columns are uniformly arranged on two sides of the support structure respectively according to stress; the supporting columns are connected with the reinforcing ribs; the support column and the support vertical surface are on the same horizontal plane.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that: the pouring gate structure of the utility model is manufactured by adopting a half-and-half die sinking mode, the two-side structure of the pouring gate can be separately heated and formed, the forming time of the pouring gate is reduced, and a die rod is not needed to be used, the die is simpler, and the damage to the cross section of the pouring gate when the die rod is moved and extracted is avoided; the pouring channel reinforcing rib is arranged to prevent the pouring channel from deforming during molding; the sand mould structurally adopts a step structure for overlapping so as to improve the clamping and limiting assembly precision between the end faces, and the special pouring gate caliber design is adopted, so that the pressure is balanced when pouring, the opening at the upper part of the pouring gate is large, the opening at the lower part of the pouring gate is small, the pouring gate is always in a full-filling state in the pouring process, and the accident that the bottom of the pouring gate forms negative pressure and is drawn into air and casting defects occur is avoided.

Drawings

FIG. 1 is a schematic structural diagram of a sand mold three-dimensional explosion model of a traditional engine cylinder;

FIG. 2 is a bearing diagram of the present runner sand mold;

FIG. 3 is a plan view of the present runner sand mold;

FIG. 4 is a side rear view of the present runner sand mold;

FIG. 5 is a rear view of the present runner sand mold;

FIG. 6 is a front view of another embodiment of the present runner sand mold;

FIG. 7 is a cross-sectional view taken along the A-A plane of another embodiment of the sand mold of the present runner;

fig. 8 is a schematic structural view of the present runner sand mold support structure.

The labels in the figure are: the structure comprises a riser core 1, a bottom plate core 2, a left profile 3, a right profile 4, a front end surface sand core 5, a rear end surface sand core 6, a cylinder barrel core 7, a cylinder barrel core assembling boss 8, a pouring channel 9, a reinforcing rib 10, a supporting structure 11 and a first contact surface 12. 13 is a second contact surface, 14 is a connecting clamping groove, 15 is a gentle slope surface, 16 is a front sand molding surface, 17 is a rear sand molding surface, and 18 is a connecting part; 19 is an upper supporting surface, 20 is a lower supporting surface, 21 is a supporting vertical surface, 22 is an auxiliary supporting surface, and 23 is a supporting column.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, a conventional engine cylinder body sand mold comprises a riser core 1 positioned at the upper end of the sand mold, a bottom plate core 2 positioned at the lower end of the sand mold, a left outer body 3 and a right outer body 4 positioned at the left and right ends of the sand mold, a front end surface sand core 5 and a rear end surface sand core 6 positioned at the front and rear ends of the sand mold, and a cylinder core 7 positioned in the sand mold, wherein the bottoms of the left outer body 3, the right outer body 4, the front end surface sand core 5 and the rear end surface sand core 6 are all limited by the bottom plate core 2, the upper parts of the left outer body 3, the right outer body 4, the front end surface sand core 5 and the rear end surface sand core 6 are all limited by the riser core 1, the bottom plate core, the right profile 4, the front end face sand core 5 and the rear end face sand core 6 are limited in the vertical direction, and the left profile 3, the right profile 4, the front end face sand core 5 and the rear end face sand core 6 are matched with each other in a profile matching mode. As shown in fig. 2, a pouring gate 9 of a sand mold of a conventional engine cylinder block is arranged on a left outer shape 3 (for a vertical pouring system), when a bottom plate core 2 of the sand mold is matched with the left outer shape 3 and a right outer shape 4, the upper end surface of the bottom plate core 2 is mainly contacted with the lower end surface of the left outer shape 3 in a plane fitting manner, and the inner side surface of the left outer shape 3 is mainly contacted with a cylinder barrel core 7 and a cylinder barrel core assembling boss 8 for limiting; in the traditional casting method of the sand mold of the pouring gate 9, the opening section is in a hyperbolic shape which is closed inwards, the traditional method is set to be in a hyperbolic shape, when the casting is convenient, mold rods respectively enter from two ends, then heating pipes are inserted into the mold rods, after coated sand is heated and formed, the design of a slope is convenient for the mold rods to be pulled out, however, in the traditional method, because the thickness of the sand mold is uniformly distributed at each position, after the mold rods are inserted, the heating pipes are inserted into the centers of the mold rods, the whole sand mold is heated, uneven heating can be caused, the heating time is difficult to control, the requirement on the accuracy of the heating time is very high, the sand mold is frequently over-burnt, the condition that the sand mold is not completely burnt and formed occurs, after the heating is finished, the mold rods need to be pulled out from the pouring gate, and because the mold rods are heated, the colloid is easily adhered to the mold rods, and the mold, the mold rod surface damages the pouring road surface, and the traditional pouring gate-shaped opening section is hyperbolic, so that the pouring gate cannot be always in a full-filling state in the pouring process of the pouring gate glue-injection port, the bottom of the pouring gate is easy to form negative pressure, air is involved, and the casting defect occurs.

In order to solve traditional sand mould water 9 sand mould heating inequality, the thermoforming time is long, and pour the problem that appears the casting defect easily when watering, the utility model discloses the people when the design, will water 9 sand mould design and water the sand mould shaping for the method of half-and-half die sinking, will water the sand mould and divide into upper and lower two parts along the central point of watering, heat the shaping to each part respectively, it is fixed to bind two heat shaping's water sand mould structure at last.

For this reason, through utility model people's long-time design and practice, finally designed can high-efficient shaping runner and guarantee to runner the integrity, can guarantee to pour the technical scheme who does not produce the negative pressure again when watering, as shown in fig. 3, it sets up in the front on terminal surface psammitolite 5 to runner 9, help reducing the sand volume of whole use like this, of course, it also can set up at rear end face psammitolite 6, specifically set up the position and use actual demand as the standard, following only with runner setting in the front terminal surface psammitolite 5 as an example, rear end face psammitolite 6's the condition is the same with front terminal surface psammitolite 5, the following is not being.

As shown in fig. 2 to 5, a pouring gate sand mold structure comprises a front sand mold surface 16 and a rear sand mold surface 17; preceding sand profile 16 is last to be provided with many vertically and horizontally staggered's strengthening rib 10, interconnect between strengthening rib 10, be provided with bearing structure 11 on watering the sand mould leading flank at place, among the prior art, structural strengthening rib 10 that does not have bearing structure 11 to only adopt evenly distributed waters the sand mould, but discover in the many experiments of utility model people, when watering and pouring, the sand mould atress of watering place is bigger, conventional strengthening rib 10 can't guarantee the completeness of sand mould totally sometimes, can appear to water, the sand mould steadiness is not good, thereby lead to watering the foundry goods defect, influence final yield.

The supporting structure comprises an upper supporting surface 19, a lower supporting surface 20, a supporting vertical surface 21 and an auxiliary supporting surface 22; the area of the lower supporting surface 20 is larger than that of the upper supporting surface 19, the supporting vertical surface 21 is connected with the upper supporting surface 19 and the lower supporting surface 20, and the auxiliary supporting surfaces 22 are arranged along two sides of the supporting vertical surface 21.

During pouring, the top molten iron pressure is minimum when viewed in the vertical direction, so that the area of the upper supporting surface 19 is relatively small, and the bottom molten iron pressure is maximum, so that the transverse width is maximum, namely the area of the lower supporting surface 20 is maximum, and the strength and the stability of the sand mold structure are ensured.

The pressure intensity P of the molten iron is pgh; the pressure F is ps, so that the larger the depth and the larger the area are seen in the vertical direction, the larger the pressure is, so that the sand core does not move and deform, the more contact points of the part with the large pressure are reasonable, and the supporting force given by the clamp changes along with the pressure change of the molten iron.

The auxiliary supporting surface 22 is not completely made into a full contact surface, so that the sand mold material is saved for the colleagues meeting the requirement on the stress strength.

A plurality of support columns 23 are arranged on the front sand mold surface, and the support columns are uniformly arranged on two sides of the support structure respectively according to stress; in this embodiment, the support column and the vertical support surface are respectively provided with 3 on the same horizontal plane at two sides of the support structure, and are connected with the reinforcing rib. The supporting column 23 and the supporting vertical surface 21 are on the same horizontal plane; the sand core has the tendency of moving outwards due to the pressure of molten iron during casting, and needs to be supported from the outside by a clamp; without the support posts 23, only the middle part of the whole sand mold can receive the clamping force, the internal molten iron pressure is distributed in all positions, the middle body part and the stress surface of the external clamp are in a centipede shape, and when the internal molten iron pressure is received, the middle part is the part which is most easily bent and deformed, so that the external clamp contact needs to be strengthened.

In another embodiment, a connecting clamping groove 14 is arranged on the back sand mold surface 17 close to the glue injection port, and the connecting clamping groove 14 is of a cuboid-like structure. When watering the sand mould and mutually supporting with the rising head core, can be more firm and convenient, in the joint, connecting slot 14 and rising head core block accomplish the cooperation equipment.

In this technical scheme, the utility model discloses the people discovery, the sand mould is when mutually supporting the joint, if connect the face to be the perpendicular, so need accurate joint of carrying on, just can accomplish the block, and, because sand mould structure itself is more fragile, at the in-process of butt joint block, the sand mould damage appears in joint portion and the direct joint of connecting-slot 14 on the rising head core appearing easily, and lead to firm effect not good, so the utility model discloses the people is through many times experimental discovery, will connecting-slot 14 is close to the one side of injecting glue mouth and is gentle domatic 15, can make when connecting, and joint portion and connecting-slot 14 on the rising head core are earlier through gentle domatic 15, find the position of accurate butt joint along gentle domatic 15 final entering connecting-slot 14, have reduced the degree of difficulty of butt joint, have also avoided the damage of sand mould simultaneously.

Due to the adoption of the scheme, the problem can exist, the distance between the pouring gate and the casting cannot be less than the safe distance of 300m, otherwise, the molten iron is burnt to penetrate through the sand mold to scrap the casting, when the connecting clamping groove 14 is arranged on the pouring gate sand mold, the connecting clamping groove 14 protrudes inwards, and the whole thickness of the pouring gate sand mold can be caused in order to ensure the safe distance.

Therefore the utility model discloses the people is on the basis of above-mentioned scheme, further improve, it can the interchange position to water connecting groove 14 on the sand mould and the connecting portion of the protruding form on the rising head core, connecting portion 18 of protruding form sets up near back sand profile 17 sprue pouring gate promptly, the connecting portion 18 overlap joint of protruding form is in setting up connecting groove 14 on the rising head core, set up on the rising head core when connecting groove 14, and protruding form connecting portion set up when watering the sand mould, can reduce the whole thickness of watering the sand mould, safety and steadiness when also guaranteeing mutual block simultaneously, and can further gain better effect, can effectually prevent that the iron liquor from scalding the sand mould and make the emergence of foundry goods scrapping accident.

Furthermore, step-shaped overlapping structures are arranged at the left edge and the right edge of the front sand molding surface 16, and each overlapping structure comprises a first contact surface 12 and a second contact surface 13; the first contact surface 12 and the second contact surface 13 are arranged perpendicular to each other, and the first contact surface 12 and the second contact surface 13 are both in a curve-shaped structure around the pouring channel. The two contact surfaces are arranged to form a step-shaped lap joint structure, so that when the pouring gate sand mold is matched with the left outer shape and the right outer shape, the clamping and limiting assembly precision between the end surfaces can be improved, and the assembly difficulty is reduced.

Further, first contact surface 12 and second contact surface 13 level mutually in the position that is close to the injecting glue mouth, are keeping away from injecting glue mouth side first contact surface 12's length and are being longer than second contact surface 13, make runner sand mould and bottom plate core, also can mutually support more accurate.

Further, the utility model discloses the people improves in the problem that exists watering to current, advances to improve watering through special algorithm formula, has improved among the prior art hyperbola type and has appeared the negative pressure in watering easily, and gaseous not enough gets into easily, will water and improve for the opening cross-section is conical, and give watering it reduces gradually from being close to the bore that the injecting glue mouth inclines to keeping away from the injecting glue mouth to water, and the opening on upper portion is big, and the opening of lower part is little, guarantees to water among the pouring process and waters all the time and be in full-up state, has stopped to water the bottom and has formed the negative pressure and be drawn into the air. The casting yield is improved.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. The runner sand mold structure comprises a runner and is characterized in that the runner is vertically arranged on a front end surface sand core or a rear end surface sand core or a left outer shape or a right outer shape of a cylinder body sand mold, and the runner is manufactured by a half-and-half mold opening method.

2. A runner sand mold structure according to claim 1, wherein the sand mold structure comprises a front sand mold face and a rear sand mold face; the front sand molding surface and the rear sand molding surface are connected in a slot mode; the front sand molding surface is provided with a plurality of criss-cross reinforcing ribs which are mutually connected, and the front side surface of the sand mold where the pouring channel is arranged is provided with a supporting structure.

3. A pouring gate sand mold structure according to claim 2, wherein an assembly connecting clamping groove is arranged on the rear sand molding surface close to the glue injection port, and the assembly connecting clamping groove is of a cuboid-like structure.

4. A pouring gate sand mold structure according to claim 3, wherein one surface of the connecting clamping groove close to the glue injection port is a gentle slope surface.

5. A pouring channel sand mold structure according to claim 4, wherein step-shaped overlapping structures are arranged at the left edge and the right edge of the front sand molding surface, and each overlapping structure comprises a first contact surface and a second contact surface; the first contact surface and the second contact surface are perpendicular to each other, and the first contact surface and the second contact surface are both in a curve-shaped structure around the pouring gate.

6. A runner sand mould structure according to claim 5, wherein the first and second contact surfaces are substantially flush adjacent the gate, the first contact surface being longer than the second contact surface on the side remote from the gate.

7. A runner sand moulding construction according to claim 6, wherein said runner is of progressively decreasing bore from adjacent to the gate to the side remote from the gate.

8. A runner sand mould structure according to claim 2, wherein said support structure comprises an upper support surface, a lower support surface, a support riser and an auxiliary support surface; the area of the lower supporting surface is larger than that of the upper supporting surface, the supporting vertical surface is connected with the upper supporting surface and the lower supporting surface, and the auxiliary supporting surfaces are arranged along two sides of the supporting vertical surface.

9. A pouring gate sand mold structure according to claim 8, wherein a plurality of supporting columns are arranged on the front sand mold surface, and the supporting columns are uniformly arranged on two sides of the supporting structure respectively according to stress; the supporting columns are connected with the reinforcing ribs; the support column and the support vertical surface are on the same horizontal plane.

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