Sand casting mold

Abstract

The invention relates to the field of casting equipment, and discloses a sand mold casting mold which comprises an upper mold body, a lower mold body and a vertical rod used for being matched with the upper mold body to slide, and further comprises a knocking mechanism used for knocking the lower mold body, an oscillating mechanism used for oscillating the upper mold body and a supporting plate fixedly connected with the bottom of the lower mold body. According to the scheme, the vibration mechanism is used for reducing the adhesive force between a formed part and the surface of the mold in a vibration mode, meanwhile, the knocking force generated by the knocking mechanism on the lower mold body is used for promoting tiny distance displacement between the formed part and the lower mold body, and the formed part can be smoothly demolded from the upper mold body and the lower mold body in sequence; therefore, the technical problem that a formed part is not easy to strip from the upper die body and the lower die body of an existing sand casting die is solved.

Description

Technical Field

[0001] The invention relates to the field of casting equipment, in particular to a sand casting mould. Background Art

[0002] Sand casting refers to a casting method that produces castings in sand molds. The basic raw materials for making sand molds are foundry sand and sand binder. The most commonly used foundry sand is siliceous sand. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting. Since the molding materials used in sand casting are cheap and easy to obtain, the mold is easy to manufacture, and it can adapt to the single-piece production, batch production and mass production of castings, it has long been the basic process in casting production.

[0003] The sand casting process is inseparable from special molds. For example, a valve body casting mold disclosed in the prior art (publication number: 202322865366.2) is used. Before opening the mold, the pressure limit column is pulled downward by a moving rod so that the bottom end of the pressure limit column is inserted into the mold cavity through the discharge port and pressed against the top of the molded part. Then, the pressure limit column is fixed by the adaptor connection between the insertion rod and the lower fixing hole, which can prevent the molded part from moving with the upper mold body, thereby preventing the molded part from being damaged.

[0004] However, due to the different roughness of the inner wall of the inner cavity, the molded part is easy to adhere not only to the upper mold body, but also to the lower mold body. Therefore, the prior art still has the technical problem that the molded part and the lower mold body are not easy to separate. Therefore, there is an urgent need for a mold that can solve the adhesion problem between the molded part and the upper mold body and between the molded part and the lower mold body at the same time, thereby improving the processing efficiency of the mold. Summary of the invention

[0005] The present invention aims to provide a sand casting mold to solve the technical problem that it is difficult to peel off a molded part from an upper mold body and a lower mold body in the existing sand casting mold.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A sand casting mold comprises an upper mold body, a lower mold body, a vertical rod for cooperating with the upper mold body to slide, a knocking mechanism for knocking the lower mold body, an oscillating mechanism for oscillating the upper mold body, and a support plate fixedly connected to the bottom of the lower mold body; the knocking mechanism comprises a driving member fixedly connected to the upper mold body, a transmission member installed on the support plate, a knocking rod driven by the driving member and the transmission member and capable of knocking the side wall of the lower mold body, and the knocking rod is slidably connected to the support plate; the oscillating mechanism comprises a plug fixedly installed on the upper mold body, a slot provided on a side of the lower mold body opposite to the plug, a snap fit is formed between the plug and the slot, an arc groove is provided on the side wall of the plug, a push rod for knocking the arc groove on the plug is installed on the inner wall of the slot, and the push rod is slidably connected to the lower mold body.

[0008] The principles and advantages of this solution are:

[0009] 1. Improve demoulding efficiency: Through the knocking process between the arc groove on the plug in the oscillation mechanism and the ejector rod installed on the inner wall of the slot, a vibration effect can be generated during the upward sliding process of the upper mold body, effectively reducing the adhesion between the molded part and the upper mold body. At the same time, the knocking rod in the knocking mechanism is used to generate a driving force through the driving part and the transmission part to drive the knocking rod to generate a continuous knocking force on the lower mold body, causing a small distance displacement between the molded part and the lower mold body. Combining the two methods of vibration and knocking can significantly improve the demoulding efficiency of the molded part from the upper mold body and the lower mold body, and reduce the difficulty of operation during the demoulding process.

[0010] 2. Improve mold closing efficiency: During the mold closing process, the vibration generated by knocking the lower mold body with a knocking rod can help the mold closing process go more smoothly. This is because during the mold closing process, the friction between the surfaces of the upper mold body and the lower mold body will hinder the smooth closing of the mold. The vibration of the lower mold body can cause a slight displacement on the mold surface. This displacement can break the static friction, so that the contact between the mold surfaces is no longer completely static, thereby reducing friction and improving the contact state, making it easier for the mold to slide into place and reducing the adhesion between the mold surfaces. This can make the mold close more smoothly, thereby reducing the mold closing time and improving production efficiency.

[0011] 3. Reduce energy consumption: The movement of the knocking mechanism and the oscillating mechanism is completely dependent on the sliding process of the upper mold body. There is no need to specially set up power components such as motors and hydraulic cylinders, which reduces energy consumption and helps reduce production costs.

[0012] 4. Simplify the structural design and reduce the maintenance cost of the mold: Since no additional power components are required, the complexity and frequency of maintenance are reduced, and the maintenance cost is reduced. It is a practical and economical solution.

[0013] Preferably, as an improvement, the driving member is a rack, which is arranged along the sliding direction of the upper mold body, and the transmission member includes a gear set meshing with the rack and several top blocks rotating coaxially with the gear set, and the knocking rod is slidably connected to the support plate, and the end of the knocking rod away from the lower mold body can be in hard contact with the inclined surface opened on the top block.

[0014] Beneficial effect: The gear set is driven by the rack, and the gear set drives the top block to rotate, so that the knocking rod can continuously knock on the lower mold body, which helps to smoothly demold the molded parts. The linkage design of the rack and gear set simplifies the complexity of the knocking mechanism, which not only reduces additional mechanical parts, but also reduces design and manufacturing costs.

[0015] Preferably, as an improvement, the knocking mechanism also includes a reset assembly for resetting the knocking rod, the reset assembly includes a first slider fixedly connected to the knocking rod, a first guide rod fixedly connected to the support plate, and a first telescopic spring fixedly connected between the first slider and the support plate, the first slider being mounted on the first guide rod and being able to slide along the first guide rod.

[0016] Beneficial effects: The reset component provides a reset function for the knocking rod, and cooperates with several top blocks in the transmission part so that the knocking rod can continuously knock on the lower mold body. Continuous knocking helps to reduce the adhesion between the molded part and the lower mold body, improves the demoulding efficiency, and reduces the difficulty of operation during the demoulding process. The first telescopic spring is used as a reset component to provide a stable reset force for the knocking rod, which helps to maintain stability during the knocking process and reduces the risk of mold damage due to instability.

[0017] Preferably, as an improvement, the gear set includes a driving gear meshing with the rack and a driven gear meshing with the driving gear, the driving member also includes a mounting shaft coaxially fixedly connected to the driven gear, a plurality of evenly distributed mounting openings are opened on the outer circle of the mounting shaft, and the top block is detachably connected to the outer circle of the mounting shaft in the mounting opening.

[0018] Beneficial effect: The active gear drives the driven gear, and the driven gear drives the top block on the mounting shaft, so that the top block can continuously hit the knocking rod, thereby continuously knocking on the lower mold body, which is conducive to the smooth demoulding of the molded parts. The top block and the mounting shaft are connected in a detachable manner. The staff can adjust the number of vacant spaces in the mounting port according to different mold sizes or molded part materials, thereby adjusting the frequency of the knocking rod knocking on the lower mold body, and realizing the free choice of high-frequency and low-frequency knocking.

[0019] Preferably, as an improvement, the oscillation mechanism also includes a buffer assembly for providing buffering for the push rod, the buffer assembly includes a second slider fixedly connected to the push rod, a second guide rod fixedly connected to the lower mold body, and a second telescopic spring fixedly connected between the second slider and the lower mold body, and the second slider is mounted on the second guide rod and can slide along the second guide rod.

[0020] Beneficial effects: The buffer assembly has the dual functions of providing buffering and resetting for the ejector pin. Through the buffering effect provided by the buffer assembly, the ejector pin can achieve high-frequency contact with the plug, thereby exerting continuous vibration on the upper mold body, which helps the molded part to be smoothly separated from the upper mold body. The resetting effect provided by the buffer assembly can ensure that the plug can smoothly enter and exit the slot.

[0021] Preferably, as an improvement, a buckle assembly for forming a buckle fit with the plug is installed on the side wall on the side opposite to the ejector rod in the slot.

[0022] Beneficial effects: Through the snap-fitting of the snap assembly and the plug, the upper mold body and the lower mold body can be quickly fixed, and it is also convenient to separate them, which improves the speed of mold assembly and disassembly. At the same time, the good fixing effect ensures the stability of the upper mold body and the lower mold body during use, reducing the safety risks caused by mold instability.

[0023] Preferably, as an improvement, the arc-shaped groove provided on the side wall of the plug has multiple sections and is wavy in shape as a whole.

[0024] Beneficial effect: By designing the arc groove into a multi-segment wave shape, the collision between the ejector rod and the arc groove is no longer a single instantaneous process, but becomes a linear multiple process. This design increases the number of collisions, helps to enhance the vibration effect, and makes it easier for the molded part to detach from the upper mold body.

[0025] Preferably, as an improvement, a bottom plate for supporting the entire mold is fixedly disposed at the bottom of the vertical pole, and a spacing is left between the support plate and the bottom plate.

[0026] Beneficial effect: By setting a bottom to support the entire mold, a distance is left between the support plate and the bottom plate, which is not only convenient for installing the gear set, but also reserves space for the downward movement of the rack, making the lower mold body on the support plate easier to shake. At the same time, this also makes the lower mold body fixedly connected to the support plate shake more after being struck by the knocking rod, and it is easier to produce a small distance displacement between the molded part and the lower mold body, which helps the molded part to be smoothly separated from the lower mold body and improves the demolding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an axonometric view of the first embodiment of the present invention;

[0028] Figure 2 For Figure 1 An axonometric view based on a top-down perspective;

[0029] Figure 3 for Figure 2 A magnified schematic diagram of position B in the middle;

[0030] Figure 4 for Figure 1 AA section view;

[0031] Figure 5 for Figure 4 A magnified schematic diagram of the C position in the middle;

[0032] Figure 6 for Figure 1 A magnified schematic diagram of the D position in the middle;

[0033] Figure 7 The corresponding embodiment of the present invention is Figure 6 An enlarged schematic diagram of . DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods:

[0035] The figure marks in the drawings of the specification include: upper mold body 1, lower mold body 2, vertical rod 3, support plate 4, knocking mechanism 5, rack 51, transmission member 52, driving gear 521, driven gear 522, mounting shaft 523, top block 524, rotating groove 525, knocking rod 53, reset assembly 54, reset groove 541, first slider 542, first guide rod 543, first telescopic spring 544, oscillation mechanism 6, plug 61, first arc groove 611, second arc groove 612, card slot 62, first mounting groove 621, second mounting groove 622, top rod 63, buffer assembly 64, buffer groove 641, second slider 642, second guide rod 643, second telescopic spring 644, bottom plate 7, and abutment head 8.

[0036] Embodiment 1

[0037] Basically Figure 1-Figure 6 As shown, a sand casting mold includes an upper mold body 1, a lower mold body 2, a vertical rod 3 for cooperating with the upper mold body 1 to slide, a knocking mechanism 5 for knocking the lower mold body 2, an oscillation mechanism 6 for oscillating the upper mold body 1, a support plate 4 fixedly connected to the bottom of the lower mold body 2, and a bottom plate 7 fixedly arranged at the bottom of the vertical rod 3 for supporting the entire mold. A total of four vertical rods 3 are arranged and pass through the four corners of the upper mold body 1, the support plate 4, and the bottom plate 7 in sequence, and a spacing is left between the support plate 4 and the bottom plate 7.

[0038] Combination Figure 2 and Figure 3The knocking mechanism 5 shown includes a rack 51 screwed to the upper mold body 1, a transmission member 52 installed on the support plate 4, a knocking rod 53 driven by the rack 51 and the transmission member 52 and capable of knocking the side wall of the lower mold body 2, and a reset assembly 54 for resetting the knocking rod 53.

[0039] In this embodiment, the rack 51 is arranged vertically, and the transmission member 52 includes a driving gear 521 meshing with the rack 51, a driven gear 522 meshing with the driving gear 521, a mounting shaft 523 coaxially fixedly installed with the driven gear 522, and a top block 524 for driving the knocking rod 53; wherein the gear ratio of the mutually meshing driving gear 521 and the driven gear 522 is 2:1, a transverse rotating groove 525 is opened inside the support plate 4, the driving gear 521 and the driven gear 522 are both rotatably installed in the rotating groove 525, so that the driven gear 522 rotates at 1 / 2 of the speed of the driving gear 521, a total of two mounting shafts 523 are provided and are respectively screwed on both sides of the driven gear 522, a total of two knocking rods 53 are provided and are respectively slidably connected to the inner walls of the two sides of the rotating groove 525, 8 evenly distributed mounting openings are opened on the outer circle of the mounting shaft 523, and the top block 524 is connected to the mounting shaft 52 in the mounting opening. The outer circle of the knock rod 53 is detachably connected by screw connection, a 45° inclined surface is provided on the top block 524, and a mating surface contacting and mating with the inclined surface on the top block 524 is provided on one end of the knock rod 53 close to the top block 524, and the mating surface is still a 45° inclined surface. When the rack 51 drives the transmission member 52 downward to operate, the mating surface on the top block 524 and the inclined surface on the knock rod 53 are in hard contact to push the knock rod 53 to move toward the lower mold body 2 and knock the side wall of the lower mold body 2. In specific use, the staff can assemble an appropriate number of top blocks 524 as needed to change the frequency of the knock rod 53 knocking the side wall of the lower mold body 2. For example, when it is necessary to knock the side wall of the lower mold body 2 at a high frequency, the top blocks 524 should be installed in all 8 installation openings. If it is necessary to reduce the frequency of the knock rod 53 knocking the side wall of the lower mold body 2, the number of installations of the top blocks 524 can be appropriately reduced, for example, leaving 4 of the installation openings vacant.

[0040] like Figure 3As shown, a transverse reset groove 541 is provided at a position corresponding to the side wall of the rotating groove 525 and the side wall of the knocking rod 53. The reset groove 541 is used to provide installation conditions for the reset assembly 54. The reset assembly 54 includes a first slider 542 integrally formed with a side of the knocking rod 53 close to the reset groove 541, a first guide rod 543 welded and fixed to the support plate 4 in the reset groove 541, and a first telescopic spring 544 bonded between the first slider 542 and the support plate 4. The first slider 542 is sleeved on the first guide rod 543. and can slide along the first guide rod 543; in specific use, when the mating surface on the top block 524 comes into hard contact with the inclined surface on the knocking rod 53 to push the knocking rod 53 to move toward the direction of the lower mold body 2, the first telescopic spring 544 is in a contracted state under the squeezing of the first slider 542, and there is a gap in the adjacent top blocks 524 contacting the knocking rod 53 in turn, that is, when the first slider 542 is out of contact with the top block 524, the first slider 542 drives the knocking rod 53 to reset under the rebound action of the first telescopic spring 544.

[0041] Combination Figure 4-Figure 6 As shown, the oscillation mechanism 6 includes a plug 61 fixedly mounted on the bottom edge of the upper mold body 1, a slot 62 that forms a snap fit with the plug 61, a push rod 63 for striking the plug 61, and a buffer assembly 64 for providing buffering and resetting functions to the push rod 63; a single-stage first arc groove 611 is provided on the side of the plug 61 close to the push rod 63, an inclined surface at an angle of 45° to the horizontal plane is provided on the lower edge of the first arc groove 611 on the plug 61 to facilitate the push rod 63 to be smoothly inserted into the first arc groove 611, a single-stage second arc groove 612 is provided on the side of the plug 61 away from the push rod 63, and the slot 62 is provided on the lower mold body 2 relative to the plug 6 1, a first mounting groove 621 opposite to the first arc groove 611 and a second mounting groove 622 opposite to the second arc groove 612 are respectively provided on both sides of the inner wall of the card slot 62, the push rod 63 is slidably connected with the lower mold body 2 in the first mounting groove 621, one end of the push rod 63 close to the second mounting groove 622 is semicircular and extends out of the first mounting groove 621 to contact the first arc groove 611 on the buckle, and the buckle assembly is slidably installed in the second mounting groove 622, the buckle assembly includes a butt joint 8 extending out of the second mounting groove 622 and realizing a buckle fit with the second arc groove 612, and the structure for resetting the butt joint 8 in the buckle assembly refers to the above-mentioned reset mechanism.

[0042] like Figure 5As shown, a buffer groove 641 communicating with the first mounting groove 621 is opened in the central area away from the lower mold body 2 on the first mounting groove 621, and the function of the buffer groove 641 is to provide installation conditions for the buffer assembly 64, and the buffer assembly 64 includes a second slider 642 integrally formed with a side of the push rod 63 close to the buffer groove 641, a second guide rod 643 welded and fixed to the lower mold body 2 in the buffer groove 641, and a second telescopic spring 644 bonded between the second slider 642 and the lower mold body 2, and the second slider 642 is sleeved on the second guide rod 643 and can slide along the second guide rod 643; in specific use, when the plug 61 located in the slot 62 gradually detaches from the slot 62, the push rod 63 will knock the first arc groove 611 after contacting the inclined surface at the bottom of the plug 61, and when the push rod 63 contacts the inner wall of the first arc groove 611, the second compression spring is in an extended state, and the push rod 63 is reset under the influence of the rebound of the second compression spring after the knocking action is completed.

[0043] The specific implementation process is as follows:

[0044] The upper mold body 1 is gradually lowered along the vertical rod 3 until the plug 61 is inserted into the slot 62 on the lower mold body 2, and the abutment head 8 is engaged with the second arc groove 612 to realize the fixed connection between the upper mold body 1 and the lower mold body 2, providing a stable processing environment for the subsequent pouring and cooling process, and finally forming a molded part in the cavity between the upper mold body 1 and the lower mold body 2. At this time, there is a certain adhesion between the molded part and the upper mold body 1 and the lower mold body 2.

[0045] When the upper mold body 1 and the lower mold body 2 are separated, as the upper mold body 1 rises, the upper mold body 1 will drive the rack 51 to rise. Since the rack 51 is meshed with the active gear 521, the rack 51 can drive the active gear 521 to rotate when it rises. The active gear 521 can drive the driven gear 522 to rotate when it rotates. The driven gear 522 can drive the mounting shaft 523 and the top block 524 to rotate when it rotates. When the top block 524 is not in contact with the knocking rod 53, the first telescopic spring 544 will drive the slider to move in the direction of the active gear 521 under the action of its own elasticity, thereby driving the knocking rod 53 to contact with the rotating top block 524 in the rotating process. As the top block 524 rotates continuously, the top block 524 also intermittently and multiple times squeezes the knocking rod 53, thereby realizing the cyclic knocking of the knocking rod 53 on the lower mold body 2, prompting a small distance displacement between the molded part and the lower mold body 2, thereby improving the separation efficiency of the molded part and the lower mold body 2.

[0046] As the upper mold body 1 rises, the plug 61 is also driven to rise. The plug 61 is previously in a state of squeezing the push rod 63, and the second telescopic spring 644 is also in a contracted state. As the plug 61 continues to rise, it can drive the push rod 63 to enter and hit the first arc groove 611, thereby hitting the plug 61 and causing vibration. Since the plug 61 is fixedly connected to the bottom of the upper mold body 1, the vibration can also be transmitted to the upper mold body 1, effectively reducing the adhesion between the molded part and the upper mold body 1, thereby ensuring the smooth separation of the upper mold body 1 and the molded part, and preventing the upper mold body 1 from driving the molded part up when it rises, and preventing the molded part from falling from the upper mold body 1 and causing damage, thereby ensuring the quality of the molded part.

[0047] In summary, this solution combines vibration and knocking, which can significantly improve the demolding efficiency of the molded parts from the upper mold body 1 and the lower mold body 2, and reduce the operational difficulty during the demolding process. At the same time, the operation of the knocking mechanism 5 and the oscillation mechanism 6 are driven by the movement of the upper mold body 1, and there is no need to set up a separate power drive device, which reduces energy consumption.

[0048] Embodiment 2

[0049] The difference between this embodiment and the first embodiment is that, Figure 7 As shown, the first arc groove 611 formed on the side wall of the plug 61 is a multi-segment arc groove. In this embodiment, three segments are provided so that the whole is wavy.

[0050] During the upward movement of the upper mold body 1, the push rod 63 reciprocates into the arc groove under the action of the second compression spring, which can achieve continuous knocking on the plug 61 and enhance the vibration effect on the upper mold body 1, thereby separating the upper mold body 1 from the molded part more smoothly.

[0051] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A sand casting mold, comprising an upper mold body, a lower mold body, and a vertical rod for sliding with the upper mold body, characterized in that: It also includes a knocking mechanism for knocking the lower mold body, an oscillating mechanism for oscillating the upper mold body, and a support plate fixedly connected to the bottom of the lower mold body; The knocking mechanism includes a driving member fixedly connected to the upper mold body, a transmission member installed on the support plate, and a knocking rod driven by the driving member and the transmission member and capable of knocking the side wall of the lower mold body, wherein the knocking rod is slidably connected to the support plate; The oscillation mechanism includes a plug fixedly mounted on the upper mold body, a slot opened on the side of the lower mold body opposite to the plug, a snap fit is formed between the plug and the slot, an arc groove is opened on the side wall of the plug, a push rod for knocking the arc groove on the plug is installed on the inner wall of the slot, and the push rod is slidably connected to the lower mold body.

2. A sand casting mold according to claim 1, characterized in that: The driving member is a rack, which is arranged along the sliding direction of the upper mold body. The transmission member includes a gear set meshing with the rack and several top blocks rotating coaxially with the gear set. The knocking rod is slidably connected to the support plate, and the end of the knocking rod away from the lower mold body can be in hard contact with the inclined surface opened on the top block.

3. A sand casting mold according to claim 2, characterized in that: The knocking mechanism also includes a reset component for resetting the knocking rod, and the reset component includes a first slider fixedly connected to the knocking rod, a first guide rod fixedly connected to the support plate, and a first telescopic spring fixedly connected between the first slider and the support plate. The first slider is mounted on the first guide rod and can slide along the first guide rod.

4. A sand casting mold according to claim 3, characterized in that: The gear set includes a driving gear meshed with the rack and a driven gear meshed with the driving gear. The driving member also includes a mounting shaft coaxially fixedly connected to the driven gear. A plurality of evenly distributed mounting openings are provided on the outer circle of the mounting shaft. The top block is detachably connected to the outer circle of the mounting shaft in the mounting opening.

5. A sand casting mold according to claim 1 or 4, characterized in that: The oscillation mechanism also includes a buffer assembly for providing buffering for the push rod, the buffer assembly includes a second slider fixedly connected to the push rod, a second guide rod fixedly connected to the lower mold body, and a second telescopic spring fixedly connected between the second slider and the lower mold body, and the second slider is mounted on the second guide rod and can slide along the second guide rod.

6. A sand casting mold according to claim 5, characterized in that: A buckle assembly which forms a buckle fit with the plug is installed on the side wall on the side opposite to the ejector rod in the clamping slot.

7. A sand casting mold according to claim 6, characterized in that: The arc-shaped grooves provided on the side wall of the plug have multiple sections and are wavy in shape as a whole.

8. A sand casting mold according to claim 7, characterized in that: A bottom plate for supporting the entire mold is fixedly arranged at the bottom of the vertical pole, and a distance is left between the support plate and the bottom plate.

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