A sand core hollowing pattern with a manual demoulding structure

Abstract

The present invention discloses a sand core hollowing pattern with a manual demoulding structure, comprising a main pattern and an auxiliary pattern, wherein the main pattern is provided with a pattern push rod axially spirally extending to its inner end surface, and the auxiliary pattern is provided with a pattern head connected to the inner end of the pattern push rod and synchronously rotating. The sand core hollowing pattern with a manual demoulding structure of the present invention has a reasonable structural design, belongs to the field of casting technology, can efficiently pull out the pattern trapped in the sand core, is simple to operate, and will not damage the sand core.

Description

Technical Field

[0001] The invention relates to casting technology, and more particularly to a sand core hollowing pattern with a manual demoulding structure. Background Art

[0002] In sand casting production, there are often many sand cores with large cross-sections. In order to reduce the weight of the sand core and the cost of sand, the large cross-section of the sand core needs to be hollowed out. When pure manual core making is used, the hollowed-out pattern is often loosened before the sand core is solidified, so as to facilitate demolding after the sand core is solidified; when the core making machine is used for automatic core making, more often the hollowed-out cross-section of the sand core does not match the demolding direction of the core making machine, and the demolding mechanism of the core making machine cannot be used to pull out the hollowed-out pattern. At this time, the hollowed-out pattern will be wrapped inside the sand core, and the hollowed-out pattern will be pulled out manually after coring. Usually, a through hole is reserved at the part where the hollowed-out pattern protrudes from the sand core, and then a steel rod is passed through the through hole to pull out the hollowed-out pattern using manpower or other auxiliary devices.

[0003] Although loosening and hollowing out the sand core before solidification facilitates demolding, it will affect the size of the sand core. After the sand core is solidified, it is manually demolded in the old way, which is laborious and time-consuming, has low production efficiency, and the auxiliary device for demolding is also complicated. Summary of the invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art, and the purpose of the present invention is to provide a sand core hollowing pattern that can efficiently pull out the hollowing pattern trapped in the sand core.

[0005] To achieve the above-mentioned purpose, the present invention provides a sand core hollowing pattern with a manual demolding structure, including a main pattern and an auxiliary pattern, wherein the interior of the main pattern is provided with a pattern push rod which extends axially and spirally to its inner end surface, and the auxiliary pattern is rotatably provided with a pattern head connected to the inner end of the pattern push rod.

[0006] Furthermore, the pattern top is provided with a locking structure connected to the inner end of the pattern top rod, and the inner end of the auxiliary pattern is provided with a limiting seat adapted to the inner end surface of the pattern top.

[0007] Furthermore, the outer end of the limit seat is provided with a thrust bearing adapted to the inner end surface of the pattern head.

[0008] Furthermore, the inner end of the auxiliary pattern is provided with a positioning hole adapted to the pattern head, and the outer end of the pattern head is provided with a positioning step adapted to the inner end of the pattern push rod; the locking structure is a fastening bolt arranged between the pattern head and the pattern push rod.

[0009] As a further improvement, a cavity is provided inside the main pattern, a threaded sleeve connected to the pattern push rod is provided at the outer end of the cavity, and a guide sleeve matched with the pattern push rod is provided at the inner end of the cavity.

[0010] Furthermore, a clamping block is provided on the outer wall of the guide sleeve, and an axially extending slot and an annular limiting slot are provided on the cavity wall at the inner end of the cavity.

[0011] Beneficial Effects

[0012] Compared with the prior art, the sand core hollowing pattern with a manual demoulding structure of the present invention has the following beneficial effects:

[0013] 1) The sand core hollowing pattern with a manual demoulding structure of the present invention can efficiently pull out the pattern trapped in the sand core, and the operation is simple.

[0014] 2) The sand core hollowing pattern with a manual demoulding structure of the present invention will not cause damage to the sand core when the main pattern is pulled out.

[0015] 3) The sand core hollowing pattern with a manual demoulding structure of the present invention is light in weight and simple in demoulding operation, which saves time and effort and improves the production efficiency of sand cores. In addition to a standard wrench, no additional auxiliary demoulding device is required. It has a wide range of applications and can be used for pure manual core making as well as for auxiliary hollowing of sand cores made by core making machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural cross-sectional view of a hollowed-out sand core with a manual demoulding structure according to the present invention.

[0017] In the figure: 1. sand core; 2. main pattern; 3. auxiliary pattern; 4. pattern push rod; 5. threaded sleeve; 6. first bolt structure; 7. guide sleeve; 8. locking structure; 9. pattern head; 10. second bolt structure; 11. pin hole; 12. limit seat; 13. thrust bearing; 14. cavity. Implementation

[0018] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0019] The specific embodiment of the present invention is as follows: Figure 1As shown, a sand core hollowing pattern with a manual demolding structure includes a main pattern 2 and an auxiliary pattern 3. When the main pattern 2 and the auxiliary pattern 3 are tightly closed, the hollow shape of the sand core 1 is formed to ensure the size requirements of the sand core 1. The main pattern 2 is provided with a pattern push rod 4 that extends axially and spirally to its inner end surface. The auxiliary pattern 3 is provided with a pattern head 9 that is connected to the inner end of the pattern push rod 4 and can rotate synchronously with the pattern push rod 4. The pattern head 9 is a rotating body structure. In the hollowing pattern of the sand core with a manual demolding structure, the pattern push rod 4 is rotated to squeeze and push the pattern head 9. Since the pattern head 9 can rotate relative to the auxiliary pattern 3, when the pattern head 9 rotates with the pattern push rod 4, the pattern head 9 will not bring a circumferential force to the auxiliary pattern 3, so that the auxiliary pattern 3 located at the inner end of the main pattern 2 is only subjected to the axial thrust of the pattern head 9. Since the auxiliary pattern 3 is located at the inner end of the cavity of the sand core 1, the auxiliary pattern 3 will not undergo axial displacement. Therefore, the pattern push rod 4 will drive the main pattern 2 to slide outward. The main pattern 2 can be pulled out of the sand core 1 by rotating the pattern push rod 4. The operation is simple and fast, and the structure of the sand core 1 will not be damaged.

[0020] After the main pattern 2 is demolded by the core pusher, the auxiliary pattern 3 still remains in the sand core, but the auxiliary pattern 3 is short and the draft angle is large. When demolding, the auxiliary pattern 3 can be pulled out by pulling the pattern push rod 4 outwards without affecting the sand core.

[0021] In this embodiment, the pattern plug 9 is provided with a locking structure 8 connected to the inner end of the pattern push rod 4, and the inner end of the auxiliary pattern 3 is provided with a limiting seat 12 adapted to the inner end surface of the pattern plug 9. The pattern plug 9 and the auxiliary pattern 3 are axially limited by the limiting seat 12.

[0022] In this embodiment, the outer end of the limit seat 12 is provided with a thrust bearing 13 adapted to the inner end surface of the pattern push head 9. One end of the pattern push head 9 can support the auxiliary pattern 3, and the other end can support the thrust bearing 13. The thrust bearing 13 axially limits the pattern push head 9, reduces the friction of the pattern push rod 9, and allows the pattern push head 9 to rotate smoothly.

[0023] In this embodiment, the limiting seat 12 is fixed to the inner end surface of the auxiliary mold 3 by the second bolt structure 10 .

[0024] In this embodiment, the inner end of the auxiliary pattern 3 is provided with a positioning hole adapted to the pattern pin 9, and the positioning hole is a stepped hole structure with a narrow outer end and a wide inner end. The outer end of the pattern pin 9 is provided with a positioning step adapted to the inner end of the pattern push rod 4, and the outer end diameter of the positioning hole is larger than the inner end diameter of the pattern push rod 4, so that the pattern push rod 4 will not contact the auxiliary pattern 3; the locking structure 8 is a fastening bolt arranged between the pattern pin 9 and the pattern push rod 4.

[0025] In this embodiment, the pattern plug 9 is provided with a countersunk hole adapted to the fastening bolt.

[0026] In this embodiment, a cavity 14 is provided inside the main pattern 2, a threaded sleeve 5 connected to the pattern push rod 4 is provided at the outer end of the cavity 14, and a guide sleeve 7 matched with the pattern push rod 4 is provided at the inner end of the cavity 14. The main pattern 2 can be made of lightweight materials and has a hollow structure, and the threaded sleeve 5 and the guide sleeve 7 inside it are made of wear-resistant materials to prevent wear of the kinematic pair and ensure service life.

[0027] The pattern push rod 4 is a transmission screw structure with an external thread on the inner end. The transmission screw structure is compatible with the threaded hole of the threaded sleeve 5 and the inner hole of the guide sleeve 7. The rotation of the pattern push rod 4 can drive the main pattern 2 to move axially through the threaded sleeve 5. The main pattern 2 will loosen after being pushed out a certain distance. At this time, it is easier to separate from the sand core. The main pattern 2 can be pulled out by hand or tools.

[0028] In this embodiment, a clamping block is provided on the outer wall of the guide sleeve 7, and an axially extending slot and an annular limiting groove are provided on the cavity wall at the inner end of the cavity 14. The guide sleeve 7 is inserted into the main mold 2 of the main mold 2 under the guidance of the slot and the clamping block, and then rotated to make the clamping block slide into the annular limiting groove, thereby realizing axial limitation of the guide sleeve 7, and the installation is quick and convenient.

[0029] The guide sleeve can also be a hard material embedded in a light soft material, cast into the main pattern 2 and then processed.

[0030] In this embodiment, the threaded sleeve 5 is fixedly installed inside the main mold 2 by means of the first bolt structure 6 , and the cavity 14 of the main mold 2 is provided with a positioning step adapted to the inner end of the threaded sleeve 5 .

[0031] In this embodiment, a pin hole 11 is provided on the side wall of the outer end of the main pattern 2, and a pull rod can be inserted into the pin hole 11 to pull out the main pattern 2; or after the pull rod is inserted, an axial slide rail coaxially extending with the main pattern 2 is provided on the outside to limit the pull rod circumferentially, so as to prevent the main pattern 2 from being subjected to the circumferential force of the threaded sleeve 5 and exerting pressure on the sand core.

[0032] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A sand core hollowing pattern with a manual demoulding structure, characterized in that: The invention comprises a main pattern (2) and an auxiliary pattern (3), wherein the main pattern (2) is provided with a pattern push rod (4) which is axially spirally extended to its inner end surface, the auxiliary pattern (3) is provided with a pattern head (9) which is connected to the inner end of the pattern push rod (4), the pattern head (9) is provided with a locking structure (8) which is connected to the inner end of the pattern push rod (4), the inner end of the auxiliary pattern (3) is provided with a limit seat (12) which is adapted to the inner end surface of the pattern head (9), the inner end of the auxiliary pattern (3) is provided with a positioning hole which is adapted to the pattern head (9), and the outer end of the pattern head (9) is provided with a positioning step which is adapted to the inner end of the pattern push rod (4); The locking structure (8) is a fastening bolt arranged between the pattern top head (9) and the pattern top rod (4); a cavity (14) is arranged inside the main pattern (2); a threaded sleeve (5) connected to the pattern top rod (4) is arranged at the outer end of the cavity (14); a guide sleeve (7) matched with the pattern top rod (4) is arranged at the inner end of the cavity (14); a clamping block is arranged on the outer wall of the guide sleeve (7); an axially extending slot and an annular limiting slot arranged on one side of the slot are arranged on the cavity wall of the inner end of the cavity (14); a pin hole (11) is arranged on the side wall of the outer end of the main pattern (2); a pull rod is inserted into the pin hole (11), and the main pattern (2) is pulled out by the pull rod.

2. The sand core hollowing pattern with a manual demoulding structure according to claim 1, characterized in that: The outer end of the limit seat (12) is provided with a thrust bearing (13) adapted to the inner end surface of the pattern head (9).

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