Salt core forming mold for facilitating mold stripping

Abstract

The utility model relates to salt core forming technology field discloses a salt core forming mould for drawing mould, including a pair of mould, the side of mould each other is close is all seted up cavity, the inside of mould is seted up with a plurality of through -slot, the inside of through -slot all inserts the assembly of top block, and the same side top block protrudes the end part fixed mounting of through -slot has the same connection frame, the upper side and the downside of mould all fixed mounting has the support frame, and the support frame is slidably installed with the pressing plate through the pin post, and the support frame all sets up a pair of first through -hole, and the pressing plate sets up the second through -hole alignment first through -hole, and the first through -hole and the second through -hole between installation have the bolt group for clamping the pressing plate, the upper side and the downside of top block all seted up the locating slot, and the side of mould each other is far away and is installed with the positioning assembly through the sliding structure, the utility model discloses through the mode of multi -point synchronous ejection drawing mould, can promote the forming rate, can fix top block in the process that bolt group installs, and the mould installation is convenient, and the operation is simple.

Description

Technical Field

[0001] This utility model relates to the field of salt core molding technology, specifically a salt core molding mold that facilitates demolding. Background Technology

[0002] Salt core forming molds are key equipment used in the casting industry to manufacture soluble salt cores. The principle is to heat inorganic salts (such as sodium chloride and sodium sulfate) to a molten state and then pour them into the mold, where they cool and solidify.

[0003] The salt core molding mold currently in use mainly consists of a pair of molds and structures such as cavities, pouring gates and vents opened on the molds. The pair of molds are locked by a group of bolts that pass through them, and the group of bolts consists of at least four bolts distributed at the four corners.

[0004] For salt cores with multiple long-distance segments, such as H-shaped salt cores, which have three long-distance segments, the bonding strength between the corners and ends of the salt core and the cavity is greater than that between the middle of the long-distance segments during the demolding process. This can easily cause breakage in the middle of the long-distance segments, affecting the molding rate.

[0005] Therefore, in order to solve the above problems, a salt core forming mold that facilitates demolding is proposed. Utility Model Content

[0006] The purpose of this invention is to provide a salt core molding die that facilitates demolding. By using multiple ejector blocks on the die that can move synchronously, the success rate of demolding is improved, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a salt core forming mold that facilitates mold release, comprising a pair of molds, each mold having a cavity on one side close to the other, and multiple through slots inside the molds, each through slot having a top block inserted into it, and the same connecting frame being fixedly installed at the end of the top block extending out of the through slot on the same side. Support frames are fixedly installed on the upper and lower sides of the mold. A pressure plate is slidably installed on the support frame via a pin. Each support frame has a pair of first through holes, and the pressure plate has a second through hole aligned with the first through holes. A bolt group for clamping the pressure plate is installed between the first through holes and the second through holes. The top block has positioning grooves on its upper and lower sides. The side of the mold that is far apart from each other is equipped with a positioning component through a sliding structure. One end of the positioning component is assembled with the pressure plate, and the other end of the positioning component is inserted into the positioning groove.

[0008] Specifically, the positioning component includes a top cone and a transmission plate. The transmission plate is connected and assembled with a sliding structure. A top cone is fixedly installed on the upper side of the transmission plate. The top cone is inserted and assembled with a positioning groove. An inclined surface is provided on the side of the transmission plate and the pressure plate that are close to each other. The end of the inclined surface away from the mold is closer to the top block than the end of the inclined surface that is close to the mold.

[0009] Furthermore, the angle between the inclined plane and the vertical plane is 45° to 60°.

[0010] Specifically, two to three sliding structures are evenly installed between each positioning component and the mold, and the sliding structures are vertically arranged.

[0011] Specifically, the sliding structure includes a dovetail guide rail, a tension spring, and a dovetail slider. The dovetail guide rail is fixedly assembled with the mold, and the dovetail slider is slidably assembled with the dovetail guide rail. The dovetail slider is fixedly assembled with the transmission plate, and a tension spring is installed between the transmission plate and the mold via a hook.

[0012] Furthermore, the sliding structure also includes stops, with stops fixedly installed at both ends of the dovetail slider.

[0013] Compared with the prior art, the beneficial effects of this utility model are: Multi-point synchronous ejection improves molding rate: Each mold is equipped with a synchronously movable ejector block. During demolding, the multi-point support method can evenly eject the molded salt core, avoiding the problem of breakage in the middle of long sections, and effectively improving the molding rate of the salt core.

[0014] The mold is easy to install and simple to operate: the positioning components, sliding structure and pressure plate are designed so that the pressure plate can be tightened during the bolt assembly process. The positioning components are moved up and down synchronously through the action of the inclined plane, so as to realize the insertion or separation of the top cone and the positioning groove, thereby fixing or releasing the top block, with less operation. Attached Figure Description

[0015] Figure 1 This is a schematic front view of the structure of this utility model; Figure 2 for Figure 1 A schematic cross-sectional view of the structure along the AA direction; Figure 3 This is an enlarged schematic diagram of the sliding structure of this utility model; Figure 4 This is a schematic front view of the rear mold of this utility model.

[0016] In the diagram: 1. Mold, 2. Top block, 3. Positioning assembly, 31. Top cone, 32. Transmission plate, 4. Sliding structure, 41. Dovetail guide rail, 42. Tension spring, 43. Dovetail slider, 44. Stop block, 5. Connecting frame, 6. Pressure plate, 7. Pin, 8. Bolt group, 9. Support frame, 10. Cavity, 11. Through groove. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 This utility model provides a technical solution: A salt core forming mold that facilitates demolding includes a pair of molds 1, each mold 1 having a cavity 10 on one side that is close to the other. After the pair of molds 1 are snapped together, the cavities 10 on both sides are also snapped together to form a complete space that conforms to the desired shape of the salt core.

[0019] The mold 1 has multiple through slots 11 inside. The position and number of through slots 11 are set according to the shape of the salt core and the position of the long section. Each through slot 11 is fitted with a top block 2. The shape of the end face of the top block 2 that extends into the cavity 10 is adapted to the surface of the cavity 10 to ensure that the shape of the salt core is not affected. The end of the top block 2 on the same side that extends out of the through slot 11 is fixedly installed with the same connecting frame 5. The connecting frame 5 is firmly connected to the multiple top blocks 2 on the same side by bolts to ensure that all top blocks 2 can move synchronously.

[0020] The top block 2 is preferably in the shape of a quadrangular frustum. Correspondingly, the shape of the through groove 11 is adapted to the top block 2, and the end area of ​​the through groove 11 near the cavity 10 is larger than the end area away from the cavity 10. This makes it necessary to insert the top block 2 from the inside of the cavity 10 outward until it is in contact with the through groove 11. This form is more conducive to the precise installation of the top block 2.

[0021] Support frames 9 are fixedly installed on the upper and lower sides of the mold 1. The support frame 9 is slidably mounted with a pressure plate 6 via a pin 7. That is, the pin 7 is welded and fixed to the support frame 9, and the pressure plate 6 has a pin hole for passing through the pin 7, so that the pressure plate 6 can slide along the axial direction of the pin 7.

[0022] Each support frame 9 has a pair of first through holes, and the pressure plate 6 has a second through hole aligned with the first through holes. A bolt group 8 for clamping the pressure plate 6 is installed between the first through holes and the second through holes. The bolt group 8 includes bolts and nuts. By tightening the nuts, the left and right aligned pressure plates 6 can be firmly clamped.

[0023] Positioning grooves are provided on the upper and lower sides of the top block 2. The positioning component 3 is installed on the side of the mold 1 that is far apart from each other through the sliding structure 4, so that the positioning component 3 has the ability to move up and down. One end of the positioning component 3 is abutted and assembled with the pressure plate 6, and the other end of the positioning component 3 is inserted and assembled with the positioning groove. When the left and right aligned pressure plates 6 move towards each other (closer or farther apart), they will push the positioning component 3 to move up and down, so that it is inserted or separated from the positioning groove, thereby fixing or releasing the top block 2.

[0024] The specific structure of positioning component 3 is as follows: The positioning component 3 includes a top cone 31 and a transmission plate 32. The transmission plate 32 is connected and assembled with the sliding structure 4. The top cone 31 is fixedly installed on the upper side of the transmission plate 32. The top cone 31 is inserted and assembled with the positioning groove. The transmission plate 32 and the pressure plate 6 are both provided with inclined surfaces on their respective sides. The end of the inclined surface away from the mold 1 is closer to the top block 2 than the end of the inclined surface close to the mold 1.

[0025] This inclined surface design allows the left and right aligned pressure plates 6 to push the transmission plate 32 up and down along the sliding structure 4 through the force between the inclined surfaces when they move in opposite directions, synchronously operating the top cone 31 on each transmission plate 32, so that the top cone 31 can be inserted into or separated from the positioning groove.

[0026] In addition, the angle between the inclined plane and the vertical plane is 45° to 60°, which ensures that when the pressure plate 6 moves a small distance, the transmission plate 32 can obtain sufficient displacement, thereby realizing the accurate insertion and separation of the top cone 31 and the positioning groove. At the same time, this angle can also ensure the efficiency of force transmission and reduce energy loss.

[0027] Two to three sliding structures 4 are evenly installed between each positioning component 3 and the mold 1. The sliding structures 4 are set vertically. The setting of multiple sliding structures 4 can ensure the stability and straightness of the positioning component 3 during the movement process and avoid deviation or shaking. The number and distribution of the sliding structures 4 are reasonably determined according to the size of the positioning component 3 and the force conditions.

[0028] The specific structure of sliding structure 4 is as follows: The sliding structure 4 includes a dovetail guide rail 41, a tension spring 42, and a dovetail slider 43. The dovetail guide rail 41 is fixedly assembled with the mold 1, and the dovetail slider 43 is slidably assembled with the dovetail guide rail 41. The dovetail slider 43 is fixedly assembled with the transmission plate 32, and the tension spring 42 is installed between the moving plate 32 and the mold 1 through a hook.

[0029] Through the sliding cooperation of the dovetail guide rail 41 and the dovetail slider 43, the transmission plate 32 can be moved stably. The function of the tension spring 42 is to pull the transmission plate 32 back to its original position after it is displaced by the pressure plate 6, so that the top cone 31 has a force to separate from the positioning groove, which is convenient for the next operation.

[0030] In addition, the sliding structure 4 also includes a stop 44. Both ends of the dovetail slider 43 are fixedly installed with stop 44. The function of the stop 44 is to limit the sliding range of the dovetail slider 43, prevent it from sliding out of the dovetail guide rail 41, and ensure the safety and reliability of the sliding structure 4.

[0031] Working principle: I. Selection of pouring temperature and mold temperature: As the mold temperature increases, the cooling rate of the molten salt gradually decreases, reducing the temperature gradient. This helps prevent uneven thermal shrinkage, allows the crystals to release stress through slippage, avoids stress concentration, and reduces the susceptibility to thermal cracking. The increased mold temperature also leads to a decrease in the surface tension of the molten salt, which is more conducive to the uniform distribution of the liquid phase between dendrites during the feeding process. This reduces the liquid film's duration and indirectly increases the strength of intergranular bridging, which helps resist shrinkage forces in the later stages of solidification and prevents thermal cracking. Experiments have shown that when the mold temperature is 300℃, the fluidity of the molten salt is significantly improved, and the salt core is easier to form.

[0032] A suitable casting temperature reduces the cooling rate due to higher superheat, disperses the heat concentration points, and slows down the shrinkage rate and concentrated deformation during the solidification of the molten salt. However, if the casting temperature is too high, it will lead to an excessively large temperature gradient between the liquid and solid phases, and the liquid film will exist for too short a time during the feeding process, increasing the probability of hot crack initiation in the salt core. Experiments have shown that when the casting temperature is 850℃, the quality of the salt core is relatively high.

[0033] II. Use of molds: In the initial state, the two transmission plates 32 on the same side move away from each other to the waiting position through the action of the sliding structure 4, and at the same time, the pressure plate 6 is pushed out to the end away from the mold 1 through the action of the inclined plane.

[0034] In use, first install the top block 2 in the through groove 11, then fasten the two molds 1 together, insert the bolt group 8 between the aligned first and second through holes and gradually tighten it. At this time, the pressure plates 6 on the left and right sides will move closer to each other. After the action of the inclined surface, the transmission plate 32 can be moved to the side closer to the top block 2 until the top cone 31 is inserted into the corresponding positioning groove, fixing the top blocks 2 at multiple places at the same time, and locking the two molds 1 so that there will be no gap between the molds.

[0035] After assembly, the mold is preheated to 300°C in a preheating furnace and then removed. At the same time, the prepared molten salt solution at 850°C is poured into the cavity through the riser and the air is vented through the vent hole. After the salt core solidifies, the bolt group 8 is disassembled. At this time, multiple top blocks 2 on the same mold 1 can be gently tapped and moved at the same time. The formed salt core is ejected and demolded through multi-point support, thus avoiding damage to the salt core.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A salt core forming mold that facilitates demolding, comprising a pair of molds (1), wherein each of the molds (1) has a cavity (10) on one side that is close to the other, characterized in that: The mold (1) has multiple through slots (11) inside, and each through slot (11) is fitted with a top block (2). The end of the top block (2) on the same side that extends out of the through slot (11) is fixedly installed with the same connecting frame (5). The upper and lower sides of the mold (1) are fixedly installed with support frames (9). The support frames (9) are slidably installed with pressure plates (6) through pins (7). The support frames (9) are provided with a pair of first through holes, and the pressure plates (6) are provided with second through holes aligned with the first through holes. A bolt group (8) for clamping the pressure plates (6) is installed between the first through holes and the second through holes. The top block (2) has positioning grooves on its upper and lower sides. The mold (1) is mounted with a positioning component (3) on the side that is far apart from each other through a sliding structure (4). One end of the positioning component (3) is abutted against the pressure plate (6), and the other end of the positioning component (3) is inserted into the positioning groove.

2. The salt core forming mold according to claim 1, characterized in that: The positioning component (3) includes a top cone (31) and a transmission plate (32). The transmission plate (32) is connected and assembled with the sliding structure (4). The top cone (31) is fixedly installed on the upper side of the transmission plate (32). The top cone (31) is inserted and assembled with the positioning groove. The transmission plate (32) and the pressure plate (6) are both provided with inclined surfaces on the side that are close to each other. The end of the inclined surface away from the mold (1) is closer to the top block (2) than the end of the inclined surface that is close to the mold (1).

3. A salt core forming mold that facilitates demolding according to claim 2, characterized in that: The angle between the inclined plane and the vertical plane is 45° to 60°.

4. A salt core forming mold that facilitates demolding according to claim 2, characterized in that: Two to three sliding structures (4) are evenly installed between each positioning component (3) and the mold (1), and the sliding structures (4) are vertically arranged.

5. A salt core forming mold that facilitates demolding according to claim 4, characterized in that: The sliding structure (4) includes a dovetail guide rail (41), a tension spring (42) and a dovetail slider (43). The dovetail guide rail (41) is fixedly assembled with the mold (1). The dovetail guide rail (41) is slidably assembled with the dovetail slider (43). The dovetail slider (43) is fixedly assembled with the transmission plate (32). The transmission plate (32) and the mold (1) are connected by a hook and a tension spring (42) is installed.

6. A salt core forming mold that facilitates demolding according to claim 5, characterized in that: The sliding structure (4) also includes a stop (44), and both ends of the dovetail slider (43) are fixedly installed with a stop (44).

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