Grading type core pulling device

Abstract

The utility model discloses a grading type core pulling device which comprises a mold core, a mold frame, a core pulling sleeve, a pulling core, an anti-abrasion plate and a core pulling mechanism. The mold core is used for casting a product; the mold frame is used for fixing the mold core; the mold core is detachably connected with the mold frame, and a core pulling sleeve is arranged on the connecting surface; the two ends, in the length direction, of the core pulling sleeve are detachably connected with the mold core and the mold frame correspondingly; a loose core is movably arranged in the loose core sleeve; a working chamber is fixedly formed in one side, away from the mold core, of the mold frame in the length direction of the core-pulling sleeve; an anti-abrasion plate is arranged on the inner wall of one end, close to the mold core, of the working chamber in the length direction of the core-pulling sleeve; the anti-abrasion plate is detachably connected with the mold frame; a core-pulling mechanism is mounted on one side, far away from the mold core, of the anti-wear plate in the length direction of the core-pulling sleeve; the core pulling mechanism comprises a fixing plate, a push plate and a hydraulic oil cylinder and is used for inserting and pulling out a pulling core. The grading type core pulling device is simple in structure and practical in function.

Description

Technical Field

[0001] The present application relates to the field of die-casting technology, and particularly to a hierarchical core-pulling device. Background Art

[0002] The core-pulling force refers to the force required to overcome the resistance when pulling out the core before the molded plastic part or casting is removed from the mold during the mold design and manufacturing process. In the core-casting work of multiple cores, the core-pulling problem needs to be solved urgently: 1. In order to reduce the core-pulling force, it is often necessary to increase the demolding slope of the core-pulling forming part, resulting in excessive machining allowance at the bottom of the product features, making the machining allowance of machining too large and uneven, and affecting the accuracy of the product's shape and position dimensions; 2. In order to reduce the core-pulling force, it is often necessary to increase the demolding slope of the core-pulling forming part, resulting in excessive machining allowance at the bottom of the product features or local thickening of the product, with the risk of shrinkage holes and product leakage after machining; 3. The holding force of the molten metal and other mold surfaces in contact with the core-pulling surface on the core-pulling forming part is dynamically changing during the instant of core-pulling. Synchronous core-pulling of multiple cores may cause the core-pulling force to be instantaneously greater than the designed and estimated core-pulling force, and the core-pulling will be stuck in the mold, causing the production to be discontinuous; 4. The product has multiple lateral features with a small distance between the features. Only one hydraulic cylinder can be arranged to connect and drive multiple cores at the same time. The hydraulic cylinder needs to provide sufficient core-pulling force. With a large core-pulling force, the supporting connection part and driving part of the lateral core-pulling occupy a large space, increasing the difficulty of mold structure design. Even the model of the die-casting machine needs to be increased, resulting in increased manufacturing costs and maintenance costs.

[0003] Therefore, in order to solve the problem of large core-pulling force required for the multi-core structure and the difficulty of core-pulling caused by large clamping force in multi-core forming, it is necessary to provide a core-pulling device with a simple structure, practical functions, and hierarchical core-pulling. Summary of the Invention

[0004] In view of the above defects or deficiencies in the prior art, it is desired to provide a hierarchical core-pulling device with a simple structure and practical functions.

[0005] A hierarchical core-pulling device provided by the present application includes a core, a mold frame, a core-pulling sleeve, a core-pulling member, an anti-wear plate, and a core-pulling mechanism;

[0006] The core is used for the casting work of the product; the mold frame is used to fix the core; the core is detachably connected to the mold frame, and a core-pulling sleeve is provided at the connection surface; both ends of the core-pulling sleeve in the length direction are detachably connected to the core and the mold frame respectively; a core-pulling member is movably arranged inside the core-pulling sleeve;

[0007] A working chamber is fixedly opened on one side of the mold frame away from the core along the length direction of the core-pulling sleeve; an anti-wear plate is provided on the inner wall of one end of the working chamber close to the core along the length direction of the core-pulling sleeve; the anti-wear plate is detachably connected to the mold frame; a core-pulling mechanism is installed on one side of the anti-wear plate away from the core along the length direction of the core-pulling sleeve;

[0008] The core-pulling mechanism includes a fixed plate, a push plate and a hydraulic cylinder, which are used for the insertion and extraction of core-pulling.

[0009] Preferably, a fixed plate is arranged on one side of the wear-resistant plate away from the mold core along the length direction of the core-pulling sleeve; a fixed groove is fixedly opened on one side of the fixed plate away from the wear-resistant plate along the length direction of the core-pulling sleeve, and a first through hole is fixedly opened on the other side corresponding to the core-pulling; the fixed groove is fixedly communicated with the first through hole;

[0010] A fixed block is fixedly arranged at one end of the core-pulling along the length direction close to the fixed plate; the fixed block is integrally formed with the core-pulling; a gap is left between one side of the fixed block close to the mold core along the length direction of the core-pulling sleeve and one side of the fixed groove close to the mold core along the length direction of the core-pulling sleeve, which is set as a clearance.

[0011] Preferably, a push plate is arranged on one side of the fixed plate away from the wear-resistant plate along the length direction of the core-pulling sleeve; the push plate is detachably connected to the fixed plate; a bracket is installed on the mold frame for installing and fixing the hydraulic cylinder; the hydraulic cylinder is installed on the bracket; the hydraulic cylinder is in transmission connection with the push plate.

[0012] Preferably, guide columns are arranged at both the top and bottom inside the working chamber; the axial direction of the guide columns is parallel to the length direction of the core-pulling sleeve; the guide columns are detachably connected to the mold frame and the wear-resistant plate; the guide columns are slidably connected to the fixed plate and the push plate.

[0013] Preferably, a second through hole is penetrated through the wear-resistant plate corresponding to the core-pulling along the length direction of the core-pulling sleeve.

[0014] Preferably, the core-pulling sleeve, the core-pulling, the first through hole, the second through hole, the fixed block and the fixed groove are set in a matching group, and multiple groups are set according to the requirements of casting work.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] (1) Ensure sufficient core-pulling force, the machining allowance of the lateral deep holes and deep cavities of the product can be reduced and designed uniformly, the machining dimensions of the product are more stable, and the dimensional accuracy of the product behavior is ensured;

[0017] (2) Ensure sufficient core-pulling force, the machining allowance at the bottom of the lateral deep holes and deep cavities of the product will not be very large, which will not cause local thickening of the product, and reduce the risks of shrinkage pores on the machined surface of the product and product leakage;

[0018] (3) Multiple groups of core-pulling act in a hierarchical manner one after another, reducing the maximum core-pulling force that the hydraulic cylinder needs to provide. In this way, according to experience and product characteristics, the safety factor when calculating the core-pulling force can be increased, and the problem that the core-pulling is stuck in the mold and the production cannot be continuous is effectively solved;

[0019] (4) The present invention creates a side core-pulling mechanism that uses a hydraulic cylinder to connect and drive multiple sets of core-pulling actions in a hierarchical manner, decomposes the core-pulling force required during core-pulling, solves the problem that the core-pulling action fails due to core-pulling jamming and continuous production cannot be carried out, and improves the reliability of the core-pulling action.

[0020] In the limited space of the mold, only a small-sized hydraulic cylinder is selected, and multiple product side holes can be formed simultaneously by one side core-pulling mechanism. The specifications and dimensions of other components of the mold are also correspondingly simplified, reducing the mold manufacturing cost and facilitating the maintenance during batch production of the mold.

[0021] It should be understood that the content described in the invention content section is not intended to limit the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objectives, and advantages of the present application will become more obvious:

[0023] Figure 1 It is a schematic structural diagram of a hierarchical core-pulling device provided by an embodiment of the present application.

[0024] Reference numerals in the figure: 1, core; 2, mold frame; 3, core-pulling sleeve; 4, core-pulling; 5, wear-resistant plate; 6, core-pulling mechanism;

[0025] 11, working chamber; 12, fixing block; 13, gap; 14, guiding column; 15, second perforation;

[0026] 21, fixing plate; 22, pushing plate; 23, hydraulic cylinder; 24, fixing groove; 25, first perforation; 26, bracket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant application and do not limit the application. Additionally, it should be noted that for the convenience of description, only the parts related to the application are shown in the drawings.

[0028] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] Please refer to Figure 1 , an embodiment of the present application provides a hierarchical core-pulling device, including a core 1, a mold frame 2, a core-pulling sleeve 3, a core-pulling 4, a wear-resistant plate 5, and a core-pulling mechanism 6;

[0030] The core 1 is used for casting the product; the mold frame 2 is used to fix the core 1; the core 1 and the mold frame 2 are detachably connected, and a core-pulling sleeve 3 is arranged at the connection surface; both ends of the core-pulling sleeve 3 along the length direction are detachably connected to the core 1 and the mold frame 2 respectively; a core-pulling 4 is movably arranged inside the core-pulling sleeve 3;

[0031] On one side of the mold frame 2 away from the core 1 along the length direction of the core-pulling sleeve 3, a working chamber 11 is fixedly opened; on the inner wall of one end of the working chamber 11 close to the core 1 along the length direction of the core-pulling sleeve 3, an anti-wear plate 5 is arranged; the anti-wear plate 5 is detachably connected to the mold frame 2; on one side of the anti-wear plate 5 away from the core 1 along the length direction of the core-pulling sleeve 3, a core-pulling mechanism 6 is installed and arranged;

[0032] The core-pulling mechanism 6 includes a fixing plate 21, a pushing plate 22 and a hydraulic cylinder 23, which are used for the insertion and extraction of the core-pulling 4.

[0033] In this embodiment, a groove for casting the product is arranged on the core 1, the position of the core 1 is fixed by the mold frame 2, the core-pulling sleeve 3 is preset at the connection of the two, and the core-pulling sleeve 3 is used for installing the core-pulling 4.

[0034] The anti-wear plate 5 is preset at the end face of one end of the working chamber 11 close to the core 1 along the length direction of the core-pulling sleeve 3. The anti-wear plate 5 and the mold frame 2 are detachably connected by bolts. The anti-wear plate 5 restricts and fixes the position of the core-pulling sleeve 3. The anti-wear plate 5 is made of wear-resistant material and is easy to replace.

[0035] In a preferred embodiment, a fixing plate 21 is arranged on one side of the anti-wear plate 5 away from the core 1 along the length direction of the core-pulling sleeve 3; on one side of the fixing plate 21 away from the anti-wear 5 plate along the length direction of the core-pulling sleeve 3, a fixing groove 24 is fixedly opened, and a first through hole 25 is fixedly opened on the other side corresponding to the core-pulling 4; the fixing groove 24 and the first through hole 25 are fixedly communicated;

[0036] At one end of the core-pulling 4 close to the fixing plate 21 along the length direction, a fixing block 12 is fixedly arranged; the fixing block 12 is integrally formed with the core-pulling 4; there is a gap between one side of the fixing block 12 close to the core 1 along the length direction of the core-pulling sleeve 3 and one side of the fixing groove 24 close to the core 1 along the length direction of the core-pulling sleeve 3, which is set as the gap 13.

[0037] Please refer to Figure 1 , in this embodiment, the fixing groove 24 is used to enable the fixing block 12 to move along the length direction of the core-pulling sleeve 3 in the fixing groove 24.

[0038] In a preferred embodiment, a push plate 22 is provided on one side of the fixed plate 21 away from the wear-resistant plate 5 along the length direction of the core-pulling sleeve 3; the push plate 22 is detachably connected to the fixed plate 21; a bracket 26 is installed on the mold frame 2 for installing and fixing the hydraulic cylinder 23; the hydraulic cylinder 23 is installed on the bracket 26; the hydraulic cylinder 23 is in transmission connection with the push plate 22.

[0039] Please refer to Figure 1 , in this embodiment, the transmission connection between the hydraulic cylinder 23 and the push plate 22 provides power for the push plate 22, enabling the push plate 22 to move along the length direction of the core-pulling sleeve 3, thereby pushing the fixed plate 21 to insert and extract the core 4.

[0040] In a preferred embodiment, guide columns 14 are provided at both the inner top and bottom of the working chamber 11; the axial direction of the guide columns 14 is parallel to the length direction of the core-pulling sleeve 3; the guide columns 14 are detachably connected to both the mold frame 2 and the wear-resistant plate 5; the guide columns 14 are slidably connected to both the fixed plate 21 and the push plate 22.

[0041] Please refer to Figure 1 , in this embodiment, the guide columns 14 are used to guide the movement of the push plate 22 and the fixed plate 21, making the movement of the push plate 22 and the fixed plate 21 more stable. Through holes for the guide columns 14 to pass through are provided on both the push plate 22 and the fixed plate 21 to cooperate with the guide columns 14 to achieve the guiding function.

[0042] In a preferred embodiment, a second through hole 15 is provided on the wear-resistant plate 5 corresponding to the core 4 penetrating along the length direction of the core-pulling sleeve 3.

[0043] Please refer to Figure 1 , in this embodiment, both the first through hole 25 and the second through hole 15 are arranged to match the corresponding core 4, so that the core 4 can move along the length direction of the core-pulling sleeve 3.

[0044] In a preferred embodiment, the core-pulling sleeve 3, the core 4, the first through hole 25, the second through hole 15, the fixing block 12 and the fixing groove 24 are arranged in a matching group, and multiple groups are provided according to the requirements of the casting work.

[0045] Please refer to Figure 1, in this embodiment, among the multiple core pulls 4, according to the needs of the casting operation, all the core pulls 4 have the same specifications, or some of the core pulls 4 have the same specifications, or they are all different, but in this application, they are collectively referred to as core pulls 4. Among the multiple fixing blocks 12 provided corresponding to the multiple core pulls 4, corresponding to the core pulls 4: all the fixing blocks 12 have the same specifications, or some of the fixing blocks 12 have the same specifications, or they are all different, but in this application, they are collectively referred to as fixing blocks 12. The length of the fixing block 12 along the length direction of the core pull sleeve 3 is set as the length of the fixing block 12, and the core pulls 4 are divided into groups according to the length of the fixing block 12, and are set as core pull group A, core pull group B, core pull group C... (that is, the core pulls 4 with the same length of the fixing block 12 are set as the same group, and are denoted as "core pull group + letter number").

[0046] Among the multiple fixing grooves 24 provided corresponding to the multiple fixing blocks 12, the lengths of the fixing grooves 24 along the length direction of the core pull sleeve 3 are all equal.

[0047] The lengths of the gaps 13 corresponding to different core pull groups are not equal, that is, the gaps 13 of the corresponding core pull group A, core pull group B, core pull group C... have different lengths, and the length of the gap 13 increases with the increase of the letter number, and the length of the gap of the core pull group A is set to 0 mm.

[0048] The working principle of this application:

[0049] When installing the core pull 4: pass the fixing plate 21 through the guide post 14, leave a certain space between the fixing plate 21 and the wear-resistant plate 5, pass the multiple core pulls 4 through the corresponding fixing grooves 24, the corresponding first through holes 25 and the corresponding second through holes 15 respectively, and finally insert them into the corresponding core pull sleeves 3. Then pass the push plate 22 through the guide post 14 and press it against the fixing plate 21, and use bolts to connect the fixing plate 21 and the push plate 22. Finally, connect the push plate 22 and the transmission end of the hydraulic cylinder 23.

[0050] When it is necessary to insert the core pull 4, start the hydraulic cylinder 23. The hydraulic cylinder 23 works to push the push plate 22, and drives the fixing plate 21 to move along the length direction of the core pull sleeve 3, so as to push the core pull 4 into the mold core. At this time, the end of the fixing block 12 close to the hydraulic cylinder 23 along the length direction abuts against the push plate 22.

[0051] When withdrawing the core-pulling 4: Start the hydraulic cylinder 23. The hydraulic cylinder 23 works to pull the push plate 22 and drive the fixed plate 21 to move along the length direction of the core-pulling sleeve 3. At this time, since the gaps 13 of the core-pulling group A, the gaps 13 of the core-pulling group B, the gaps 13 of the core-pulling group C... have different lengths, and the length of the gap 13 of the core-pulling group A is set to 0, the core-pulling 4 of the core-pulling group A first receives the pulling force brought by the fixed plate 21 and moves along the length direction away from the mold core 1. After moving a certain distance (this distance is equal to the length of the gap 13 of the core-pulling group B), the core-pulling 4 of the core-pulling group B receives the pulling force brought by the fixed plate 21 and moves along the length direction away from the mold core 1. After the core-pulling 4 of the core-pulling group A and the core-pulling 4 of the core-pulling group B are synchronously withdrawn by a certain distance (this distance is equal to the length of the gap 13 of the core-pulling group C minus the length of the gap 13 of the core-pulling group B), the core-pulling 4 of the core-pulling group C receives the pulling force brought by the fixed plate 21 and moves along the length direction away from the mold core 1. In this way, the withdrawal of multiple core-pulling groups or multiple core-pullings 4 is completed by means of hierarchical core-pulling.

[0052] In the description of this specification, terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0054] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A hierarchical core-pulling device, characterized in that, It includes a mold core, a mold frame, a core-pulling sleeve, a core-puller, a wear-resistant plate and a core-pulling mechanism; The mold core is used for casting the product; the mold frame is used for fixing the mold core; the mold core is detachably connected to the mold frame, and the core-pulling sleeve is arranged at the connection surface; both ends of the core-pulling sleeve in the length direction are detachably connected to the mold core and the mold frame respectively; the core-puller is movably arranged inside the core-pulling sleeve; On one side of the mold frame away from the mold core along the length direction of the core-pulling sleeve, a working chamber is fixedly opened; on the inner wall of one end of the working chamber close to the mold core along the length direction of the core-pulling sleeve, the wear-resistant plate is arranged; the wear-resistant plate is detachably connected to the mold frame; on one side of the wear-resistant plate away from the mold core along the length direction of the core-pulling sleeve, the core-pulling mechanism is installed and arranged; The core-pulling mechanism includes a fixing plate, a pushing plate and a hydraulic cylinder, and is used for the insertion and extraction of the core-puller.

2. The hierarchical core-pulling device according to claim 1, wherein On one side of the wear-resistant plate away from the mold core along the length direction of the core-pulling sleeve, the fixing plate is arranged; on one side of the fixing plate away from the wear-resistant plate along the length direction of the core-pulling sleeve, a fixing groove is fixedly opened, and on the other side, a first through hole is fixedly opened corresponding to the core-puller; the fixing groove is fixedly communicated with the first through hole; At one end of the core-puller close to the fixing plate in the length direction, a fixing block is fixedly arranged; the fixing block is integrally formed with the core-puller; a gap is left between one side of the fixing block close to the mold core along the length direction of the core-pulling sleeve and one side of the fixing groove close to the mold core along the length direction of the core-pulling sleeve, and it is set as a clearance.

3. The hierarchical core-pulling device according to claim 2, characterized in that, On one side of the fixing plate away from the wear-resistant plate along the length direction of the core-pulling sleeve, the pushing plate is arranged; the pushing plate is detachably connected to the fixing plate; a bracket is installed on the mold frame for installing and fixing the hydraulic cylinder; the hydraulic cylinder is installed on the bracket; the hydraulic cylinder is in transmission connection with the pushing plate.

4. The hierarchical core-pulling device according to claim 3, wherein At the top and bottom inside the working chamber, guide posts are arranged; the axial direction of the guide posts is parallel to the length direction of the core-pulling sleeve; the guide posts are detachably connected to the mold frame and the wear-resistant plate; the guide posts are slidably connected to the fixing plate and the pushing plate.

5. The stepped core-pulling device according to claim 4, wherein On the wear-resistant plate, a second through hole is penetrated corresponding to the core-puller along the length direction of the core-pulling sleeve.

6. The stepped core-pulling device according to claim 5, wherein The core-pulling sleeve, the core-puller, the first through hole, the second through hole, the fixing block and the fixing groove are arranged in groups in a matching manner, and multiple groups are set according to the requirements of the casting work.

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