Taper matching mechanism for mold core and bushing of extrusion casting mold
By setting the transition surface and mating surface of taper fit between the core and bushing of the extruded casting mold, the material shortage and flash problems caused by clearance fit are solved, and a more efficient production process and lower post-processing are achieved. cost.
Patent Information
- Application Number
- CN202421239063.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-03
AI Technical Summary
During the extrusion casting process, the fit between the core and the bushing leads to the release agent and oil spillover, causing product material shortage and flashing, which leads to layering defects.
The core and bushing design adopt a taper fit is achieved by setting a taper transition surface on the outer annular surface of the upper core of the core and matching mating surface on the inner annular surface of the bottom of the movable bushing. Cooperate.
Effectively prevent release agents and grease from spilling out, avoid metal liquid entering the gap, reduce the generation of flashes, thereby reducing product defects and layering defects, improving production efficiency and reducing post-processing costs.
Smart Images
Figure CN222492107U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of extrusion casting molds, in particular to a taper matching mechanism between a core and a bushing of an extrusion casting mold. Background Art
[0002] Casting refers to a processing method in which solid metal is melted into liquid and poured into a mold of a specific shape, waiting for it to solidify and form. One of the processing methods is liquid die forging, which is also called squeeze casting, continuous casting and forging. It is an emerging metal forming process that has both casting characteristics and is similar to die forging. It is to pour a certain amount of molten metal to be cast directly into a cavity coated with lubricant, and continuously apply mechanical static pressure, using the easy flow of metal casting and forging technology during solidification to cause plastic deformation of the solidified hard shell, so that the metal crystallizes and solidifies under pressure and forcibly eliminates shrinkage cavities and shrinkage formed by solidification shrinkage, so as to obtain liquid die forging parts without casting defects.
[0003] The product structure (commonly used for round castings) determines the mold structure. Sometimes a bushing is needed to eject the casting. The core and bushing are matched in a direct and clearance fit. In die-casting production, the bushing needs to reciprocate back and forth to eject the casting and reset it.
[0004] During the die-casting production process, mold release agent needs to be sprayed. Residual mold release agent and grease will overflow from the gap between the core and the bushing, and the overflowed mold release agent will cause defects such as product shortage and oil stains. In another case, due to the gap fit, under the high pressure of the molten metal, molten metal often enters the gap, causing flash. When the bushing makes reciprocating motion, the flash overflows, resulting in the defect of casting stratification. Utility Model Content
[0005] In order to solve the above technical problems, the utility model provides a taper matching mechanism between a core and a bushing of an extrusion casting mold.
[0006] The technical solution of the utility model is: a taper matching mechanism of a core and a bushing of an extrusion casting mold, comprising: a fixed mold and a movable mold; an insert embedded in the connection between the fixed mold and the movable mold; a core located on the insert and the fixed mold; and a movable bushing located inside the insert and sleeved on the core; wherein the core comprises a lower core, a middle core, and an upper core, the top outer ring surface of the upper core is provided with a transition surface set in a taper, and the inner ring surface of the bottom of the movable bushing is provided with a matching surface adapted to the taper of the transition surface.
[0007] Furthermore, the fixed mold includes a fixed mold plate and a fixed mold back plate, the core is fixed on the fixed mold back plate, and the fixed mold back plate can be fixed on the equipment, and the movable bushing is fixed in the fixed mold plate through an insert.
[0008] Furthermore, the insert includes an upper insert fixed on the movable mold; a lower insert embedded in the fixed mold, the lower insert being adapted to be arranged with the upper insert; and a filling insert arranged in the upper insert and capable of contacting the upper core.
[0009] Furthermore, the movable bushing is fixed in the lower insert.
[0010] Furthermore, the movable mold includes a lower movable mold and an upper movable mold, wherein the lower movable mold is in contact with the fixed mold, and the upper movable mold is provided with a cooling system.
[0011] Furthermore, the taper between the transition surface and the mating surface is 0.7 degrees.
[0012] Furthermore, the outer ring surface at the top end of the movable bushing extends outward to form a raised extension ring.
[0013] Furthermore, cooling pipelines are provided inside the insert and the core, and the cooling pipelines are connected in parallel through a cooling system.
[0014] The beneficial technical effect of the utility model is that by setting a tapered transition surface and a mating surface, when the movable bushing reciprocates, the movable bushing and the core are tightly tapered and matched, so there will be no overflow of release agent, grease, etc. In addition, since there is no gap in the fit, no molten metal will enter, that is, no flash will be generated, so that the product will not have defects such as material shortage and stratification. The products produced can reduce the subsequent processing steps, effectively improve the production efficiency, and can reduce the subsequent cost of processing the products, thereby improving practicality. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of a front cross-section of the structure of the utility model;
[0016] Figure 2 It is a structural stereoscopic schematic diagram of the upper core and the movable bushing of the utility model;
[0017] Figure 3 It is a schematic diagram of the structural cross section of the upper core and the movable bushing of the utility model;
[0018] Figure 4 It is a schematic diagram of the structural section of the insert of the utility model;
[0019] Figure 5 It is a schematic diagram of the structural section of the movable bushing of the utility model.
[0020] The numbers and letters in the figure represent the corresponding component names:
[0021] 1. Fixed mold back plate; 2. Fixed mold plate; 3. Moving mold; 4. Upper insert; 41. Lower insert; 42. Filling insert; 5. Lower core; 51. Middle core; 52. Upper core; 53. Transition surface; 6. Movable bushing; 61. Matching surface; 62. Extension ring. DETAILED DESCRIPTION
[0022] In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.
[0023] See attached Figure 1-5 As shown, the taper matching mechanism of the core and the bushing of the extrusion casting mold of the first embodiment includes: a fixed mold and a movable mold 3; an insert embedded in the connection between the fixed mold and the movable mold 3; a core located on the insert and the fixed mold; and a movable bushing 6 located inside the insert and sleeved on the core.
[0024] The movable bushing 6 can be fixed on the fixed mold by an insert, and when it moves, it can reciprocate on the core to realize the function of ejecting the casting.
[0025] The core includes a lower core 5 , a middle core 51 , and an upper core 52 . The top outer ring surface of the upper core 52 is provided with a transition surface 53 with a taper. The bottom inner ring surface of the movable bushing 6 is provided with a matching surface 61 that matches the taper of the transition surface 53 .
[0026] The existing core and the movable bushing 6 are directly matched and have a clearance fit, so no transition surface 53 and a mating surface 61 are set. During the movement of the movable bushing 6, residual release agent and grease will overflow from the mating gap between the core and the bushing, and the overflowed release agent will cause defects such as product shortage and oil stains. Due to the clearance fit, under the action of the high-pressure of the molten metal, molten metal often enters the gap, causing flash. When the bushing makes a reciprocating motion, the flash overflows, resulting in the defect of casting stratification.
[0027] Since the tapered transition surface 53 and the mating surface 61 are provided, when the movable bushing 6 reciprocates, the movable bushing 6 and the core are in a tight tapered fit, and there will be no overflow of release agent, grease, etc. In addition, since there is no gap in the fit, no molten metal will enter, that is, no flash will be generated, so that the product will not have defects such as material shortage and stratification. The products produced can reduce the subsequent processing steps, effectively improve the production efficiency, and can reduce the subsequent cost of processing the products, thereby improving practicality.
[0028] Furthermore, the fixed mold includes a fixed mold plate 2 and a fixed mold back plate 1, the core is fixed on the fixed mold back plate 1, and the fixed mold back plate 1 can be fixed on the equipment, and the movable bushing 6 is fixed in the fixed mold plate 2 through an insert.
[0029] When the die casting is completed and the mold is opened, the spring pops out the fixed mold plate 2, driving the movable bushing 6 to move forward and eject the casting. Since the core is fixed on the fixed mold back plate 1, and the fixed mold back plate 1 is fixed on the equipment and does not move, when the mold is closed, the movable mold 3 presses the fixed mold back to fit with the fixed mold back plate 1, and the movable bushing 6 also moves backward.
[0030] Furthermore, the insert includes an upper insert 4 fixed on the movable mold 3 ; a lower insert 41 embedded in the fixed mold, the lower insert 41 is adapted to be arranged with the upper insert 4 ; and a filling insert 42 arranged in the upper insert 4 and capable of contacting the upper core 52 .
[0031] The core can be fixed on the fixed mold back plate 1 by using the insert, and the movable bushing 6 can be fixed on the fixed mold plate 2, and the gap between the insert and the core forms a casting molding space.
[0032] Furthermore, the movable bushing 6 is fixed in the lower insert 41 .
[0033] The movable bushing 6 can be fixed by the lower insert 41 . Since the lower insert 41 is located in the fixed mold plate 2 , the movable bushing 6 can be fixed in the fixed mold plate 2 by using the lower insert 41 .
[0034] Furthermore, the movable mold 3 includes a lower movable mold 3 and an upper movable mold 3 , wherein the lower movable mold 3 is in contact with the fixed mold, and the upper movable mold 3 is provided with a cooling system.
[0035] The lower movable mold 3 is used to close the mold with the fixed mold, and the cooling system of the upper movable mold 3 can cool the movable mold 3 and the fixed mold so that the casting can be formed quickly.
[0036] Furthermore, the taper between the transition surface 53 and the matching surface 61 is 0.7 degrees.
[0037] Since the taper of the movable bushing 6 is 0.7 degrees, the inner annular surface can increase the space to allow residual mold release agent.
[0038] Furthermore, the outer ring surface at the top end of the movable bushing 6 extends outward to form a protruding extension ring 62 .
[0039] Furthermore, cooling pipelines are provided inside the insert and the core, and the cooling pipelines are connected in parallel through a cooling system.
[0040] The cooling system can deliver coolant to inserts and cores to improve the efficiency of casting forming.
[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.
Claims
1. A taper matching mechanism between a core and a bushing of an extrusion casting mold, characterized in that: include: Fixed mold and movable mold (3); An insert embedded in the connection between the fixed mold and the movable mold (3); cores located on the insert and the fixed mold; and, A movable bushing (6) located inside the insert and sleeved on the core; The core comprises a lower core (5), a middle core (51), and an upper core (52); the top outer ring surface of the upper core (52) is provided with a transition surface (53) arranged in a taper; the inner ring surface at the bottom of the movable bushing (6) is provided with a matching surface (61) adapted to the taper of the transition surface (53).
2. The taper matching mechanism between the core and the bushing of the squeeze casting mold according to claim 1, characterized in that: The fixed mold comprises a fixed mold plate (2) and a fixed mold back plate (1), the core is fixed on the fixed mold back plate (1), and the fixed mold back plate (1) can be fixed on the equipment, and the movable bushing (6) is fixed in the fixed mold plate (2) through an insert.
3. The taper matching mechanism between the core and the bushing of the squeeze casting mold according to claim 1, characterized in that: The insert comprises an upper insert (4) fixed on the movable mold (3); a lower insert (41) embedded in the fixed mold, the lower insert (41) being adapted to be arranged with the upper insert (4); and a filling insert (42) arranged in the upper insert (4) and capable of contacting the upper core (52).
4. The taper matching mechanism between the core and the bushing of the squeeze casting mold according to claim 3, characterized in that: The movable bushing (6) is fixed in the lower insert (41).
5. The taper matching mechanism between the core and the bushing of the squeeze casting mold according to claim 1, characterized in that: The movable mold (3) comprises a lower movable mold (3) and an upper movable mold (3), wherein the lower movable mold (3) is in contact with the fixed mold, and the upper movable mold (3) is provided with a cooling system.
6. The taper matching mechanism between the core and the bushing of the squeeze casting mold according to claim 1, characterized in that: The taper between the transition surface (53) and the matching surface (61) is 0.7 degrees.
7. The taper matching mechanism between the core and the bushing of the squeeze casting mold according to claim 1, characterized in that: The outer ring surface at the top end of the movable bushing (6) extends outward to form a protruding extension ring (62).
8. The taper matching mechanism between the core and the bushing of the squeeze casting mold according to claim 5, characterized in that: The insert and the core are both provided with cooling pipelines, which are connected in parallel through a cooling system.