A core positioning mechanism
By using a cross-shaped positioning mechanism with a soft guide structure during the casting process and employing a laser for accurate positioning, the problem of positioning intermediate sand cores has been solved, thereby improving the dimensional accuracy of castings and the efficiency of core placement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- KOCEL EQUIP
- Filing Date
- 2021-09-27
- Publication Date
- 2026-07-03
AI Technical Summary
When casting D-shaped wind turbine hubs, it is difficult to accurately align the core head of the intermediate sand core with the lower sand mold, resulting in sand inclusion, sand core damage, and casting dimensional deviations. Existing methods have low reliability and low core setting efficiency.
A cross-shaped positioning mechanism with a soft guide structure is adopted. Through the cooperation of the cross-shaped positioning device and the positioning plate, the laser beam emitted by the laser is used for accurate positioning to ensure the parallelism and alignment of the middle sand core and the lower sand mold.
This method enables accurate positioning of the sand core, avoids sand inclusion and damage to the sand core, improves the accuracy and efficiency of core setting, and ensures the dimensional accuracy of the casting.
Smart Images
Figure CN115870455B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a core positioning mechanism, and more particularly to a positioning mechanism for core positioning of wheel hub castings. Background Technology
[0002] For D-shaped wind turbine hub castings, the main shaft end has a large size and wall thickness, requiring high quality. To ensure the quality of the key component, the main shaft end, production is typically carried out with the main shaft end facing downwards. The parting line is chosen near the center of the hub, dividing both the sand mold and the sand core into upper and lower halves. Since the middle sand core is smaller at the top and larger at the bottom, directly placing the core would interfere with the lower sand mold. Therefore, an additional side sand core needs to be designed on each of the three blade mounting surfaces of the hub. During mold assembly, the middle sand core is placed first, followed by the side sand cores. The middle sand core is positioned using the core head below it. During the positioning process of the sand core into the corresponding core head of the lower sand mold, it is impossible to see whether the middle core head is aligned with the lower core head. The middle core head is prone to scraping or colliding during core head positioning, leading to damage to the sand core or the lower sand mold and easily causing casting defects such as sand inclusions. Furthermore, since the core head is much smaller than the core body, even small deviations at the core head due to gaps, core head damage, or core head positioning issues can lead to large deviations in the core body, ultimately resulting in dimensional defects in the casting. To address this problem, methods such as increasing the core gap, increasing the draft angle, or slowly lowering the core for adjustment, or using a core guide rod, are generally employed. However, these methods have low reliability, require repeated adjustments to the core position, have low core lowering efficiency, inaccurate positioning, and significant dimensional defects. Summary of the Invention
[0003] Due to the unique nature of its casting process, the wheel hub casting of this invention presents a problem where the core head of the intermediate sand core is not visible during the casting assembly process. This invention addresses this issue by using a specially designed cross-shaped positioning mechanism with a soft guiding structure, ensuring accurate positioning of the intermediate sand core. This invention can also be used in other situations where core head positioning is difficult.
[0004] The objective of this invention is achieved as follows:
[0005] A core positioning mechanism, comprising: a cross positioning device, a positioning plate, and a positioning source;
[0006] The cross positioning device includes a cross positioning sleeve and a cross positioning frame. The positioning source is arranged on one side of the cross positioning frame, and the cross positioning sleeve is arranged on the side of the cross positioning frame away from the positioning source. The cross positioning device is arranged on the intermediate sand core.
[0007] The positioning plate is disposed on the lower sand mold, and positioning elements are provided on the positioning plate;
[0008] The beam emitted by the positioning source coincides with the positioning element.
[0009] In one embodiment, the positioning element is a stainless steel wire.
[0010] In one embodiment, the transverse groove of the cross-shaped positioning sleeve is parallel to the parting surface of the casting.
[0011] In one embodiment, the cross-shaped positioning frame is matched with the cross-shaped positioning sleeve.
[0012] In one embodiment, the cross-shaped positioning frame and the positioning source need to be rigidly fixed.
[0013] In one embodiment, the beam emitted by the positioning source forms a 90° angle with the crossbar of the cross positioning frame.
[0014] In one embodiment, the light beam is a fan shape, and the beam width is less than 2 mm over a distance of 1 m.
[0015] In one embodiment, the positioning source is a laser.
[0016] The technical solution adopted in this invention can achieve the following beneficial effects:
[0017] The core positioning mechanism disclosed in this invention has a simple structure. It adjusts the sand core to be parallel to the lower sand mold, ensuring the core head of the sand core is perfectly aligned vertically with the core head of the lower sand mold, and preventing rotation and horizontal offset of the sand core. The slow, vertical descent of the sand core achieves accurate mold closing, is simple to operate, highly safe, and avoids problems such as sand inclusion, sand core damage, and casting dimensional defects. Attached Figure Description
[0018] Figure 1 Schematic diagram of wheel hub casting
[0019] Figure 2 Schematic diagram of sand core assembly
[0020] Figure 3 Diagram of the core positioning process
[0021] Figure 4 Schematic diagram of the lower core positioning mechanism
[0022] Figure 5 Schematic diagram of the cross-shaped positioning sleeve structure
[0023] Explanation of reference numerals in the attached figures:
[0024] Among them, 10-hub casting; 101-parting surface of hub casting; 20-intermediate sand core; 201-cross positioning sleeve; 202-cross positioning bracket; 203-cross groove; 30-lower sand mold; 40-side sand core; 60-positioning plate; 601-positioning component; 70-positioning source; 701-beam; Detailed Implementation
[0025] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.
[0026] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "end," "top," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The lower core positioning mechanism is described below with reference to specific embodiments to further understand the concept of the lower core positioning mechanism. Please refer to... Figures 1 to 5 A lower core positioning mechanism includes: a cross positioning device and a positioning plate 60; the cross positioning device includes a cross positioning sleeve 201, a cross positioning frame 202, and a positioning source 70; the positioning source 70 is disposed on one side of the cross positioning frame 202, and the cross positioning sleeve 201 is disposed on the side of the cross positioning frame 202 away from the positioning source 70; the positioning plate 60 is disposed on the lower sand mold 30, and a positioning element 601 is disposed on the positioning plate 60.
[0028] A cross-shaped locating sleeve 201 is provided with a cross groove 203. The cross-shaped locating sleeve 201 is set on the vertical surface of the intermediate sand core 20. The horizontal groove of the cross groove 203 needs to be parallel to the parting surface 101 of the wheel hub casting. Multiple cross-shaped locating sleeves 201 can be set on the intermediate sand core 20, preferably three.
[0029] One side of the cross positioning bracket 202 is set inside the cross positioning sleeve 201. The cross positioning bracket 202 and the cross positioning sleeve 201 are matched. Multiple cross positioning brackets 202 can be set on the intermediate sand core 20, preferably three. The function of the cross positioning sleeve 201 is to position and place the cross positioning bracket 202. A positioning source 70 is set on the side of the cross positioning bracket 202 away from the cross positioning sleeve 201. The beam 701 emitted by the positioning source 70 is fan-shaped, and the width of the beam 701 is less than 2mm over a distance of 1m. The positioning source 70 is rigidly fixed to the cross positioning bracket 202. After the positioning source 70 is fixed, the angle between the beam 701 emitted by the positioning source 70 and the transverse groove of the cross positioning bracket 202 is 90°. Multiple positioning sources 70 can be set, preferably three.
[0030] The positioning plate 60 is embedded in the lower sand mold 30. The position of the positioning plate 60 embedded in the lower sand mold 30 is determined by the beam 701 emitted by the positioning source 70. The beam 701 can hit the positioning plate 60. The positioning plate 60 is a square metal plate. Any side of the positioning plate 60 is parallel to the parting surface 101 of the wheel hub casting. Multiple positioning plates 60 can be set, preferably three.
[0031] The positioning element 601 is a metal wire, preferably a stainless steel wire with a large color difference from the lower sand mold 30. The diameter of the positioning element 601 is less than or equal to 2mm. The position of the positioning element 601 on the positioning plate 60 is determined by the beam 701 emitted by the calibrated positioning source 70.
[0032] In one embodiment, three cross-shaped positioning sleeves 201 are pre-embedded on three vertical surfaces of the intermediate sand core 20 with an included angle of 60°. One side of the cross-shaped positioning frame 202 is embedded in the cross-shaped positioning sleeve 201, and the other side is rigidly fixed to the positioning source 70. The positioning source 70 is calibrated after being fixed. When the beam 701 emitted by the positioning source 70 is completely perpendicular to the horizontal groove of the cross-shaped positioning frame 202, it indicates that the positioning source 70 has been calibrated. The positioning plate 60 is pre-embedded on the lower sand mold 30. The positioning plate 60 determines its position on the lower sand mold 30 by the beam 701 emitted by the calibrated positioning source 70, ensuring that the beam 701 can hit the positioning plate 60. The positioning plate 60 is a square metal plate. Any side of the positioning plate 60 is parallel to the parting surface 101 of the wheel hub casting. The three positioning plates 60 are pre-embedded on three vertical surfaces of the lower sand mold 30 with an included angle of 120°. If, during the lowering process of the intermediate sand core 20, the beam 701 forms an angle with the positioning element 601, it indicates that the intermediate sand core 20 is not parallel to the lower sand mold 30. Adjust the intermediate sand core 20 until the beam 701 is parallel to the positioning element 601. Then, adjust the position of the intermediate sand core 20 horizontally until the beam 701 and the positioning element 601 are completely aligned. Lower the intermediate sand core 20 smoothly, completing the lowering process. After the intermediate sand core 20 is lowered, retrieve the cross positioning frame 202 and the positioning source 70.
[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0034] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A core positioning mechanism, characterized in that, The lower core positioning mechanism includes: a cross positioning device, a positioning plate, and a positioning source; the cross positioning device includes a cross positioning sleeve and a cross positioning frame, the positioning source is disposed on one side of the cross positioning frame, the cross positioning sleeve is disposed on the side of the cross positioning frame away from the positioning source, and the cross positioning device is disposed on the middle sand core; the positioning plate is disposed on the lower sand mold, and a positioning element is disposed on the positioning plate; the beam emitted by the positioning source coincides with the positioning element, the beam emitted by the positioning source forms a 90° angle with the crossbar of the cross positioning frame, the beam is fan-shaped, and the beam width is less than 2 mm over a distance of 1 m.
2. The lower core positioning mechanism according to claim 1, characterized in that, The positioning element is made of stainless steel wire.
3. The lower core positioning mechanism according to claim 1, characterized in that, The horizontal groove of the cross-shaped positioning sleeve is parallel to the parting surface of the casting.
4. The lower core positioning mechanism according to claim 1, characterized in that, The cross-shaped positioning frame is matched with the cross-shaped positioning sleeve.
5. The lower core positioning mechanism according to claim 1, characterized in that, The cross-shaped positioning frame and the positioning source must be rigidly fixed.
6. The lower core positioning mechanism according to claim 1, characterized in that, The positioning source is a laser.