Mold core positioning device for precision casting

Abstract

The utility model discloses a mold core positioning device for precision casting, which relates to the technical field of precision casting, and comprises a lower positioning seat, a positioning groove is arranged in the middle of the upper part of the surface of the lower positioning seat, an upper positioning seat is arranged above the lower positioning seat, a bulge is fixedly arranged below the surface of the upper positioning seat, and the lower part of the surface of the upper positioning seat is provided with a positioning groove. A positioning cylinder is fixedly installed on the edge of the upper portion of the surface of the lower positioning seat, and a side plate is fixedly installed below the right side of the surface of the lower positioning seat. Compared with the conventional common core positioning device for precision casting, the core positioning device for precision casting synchronously moves towards the middle part of the lower positioning seat through the centering mechanism, so that the upper positioning seat and the lower positioning seat which are positioned at any position in the positioning cylinder above the lower positioning seat can be pushed to be accurately and automatically opposite in a manner that the central axis is vertical up and down; the positioning speed is high, efficiency is high, precision is high, positioning accuracy of the upper die and the lower die can be guaranteed without adopting a long positioning rod for positioning, and the device is small in size and simpler and more convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a core positioning device for precision casting. Background Art

[0002] In the core manufacturing process, it generally goes through the processes of modeling, trimming, box assembly, hoisting and moving, casting, etc. In this series of processes, the positioning of the core often needs to be achieved through the cooperation of the sand box positioning holes and positioning pins.

[0003] For example, the public document with application number 201621408832.8 discloses a core-cavity positioning device. This utility model solves the technical problems of poor positioning effect and large eccentricity of traditional core-cavity, and has the advantages of high eccentricity adjustment accuracy, good positioning effect and strong practicality. However, in the production process of large and ultra-large complex precision castings, the height of the sand box often exceeds 2500 mm. In the process of assembling the sand box, the core and the cavity also need to be hoisted and moved for alignment before they can be matched. In order to ensure the upper and lower coaxiality of several sand boxes, A very long positioning rod will be used to ensure the accurate relative position between the upper and lower positioning seats. This positioning method cannot meet the positioning needs of precision castings, and often causes the upper and lower sand boxes to be misaligned during the process of closing and lifting and moving, which in turn affects the accuracy and quality of the castings. If the positioning rod is not used and the lifting is relied upon to gradually move down for comparison, the closing accuracy will be lower, the quality will be worse, and the closing efficiency will be extremely low. It is difficult for both to ensure that the upper and lower positioning seats can be accurately, stably and quickly aligned in the center, thereby completing the precise closing work.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a core positioning device for precision casting is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a core positioning device for precision casting to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a core positioning device for precision casting, comprising a lower positioning seat, a positioning groove is opened in the middle of the upper surface of the lower positioning seat, an upper positioning seat is arranged above the lower positioning seat, a protrusion is fixedly installed below the surface of the upper positioning seat, a positioning cylinder is fixedly installed at the edge of the upper surface of the lower positioning seat, a side plate is fixedly installed below the right side of the surface of the lower positioning seat, and a centering mechanism is arranged on the surface of the lower positioning seat.

[0007] Preferably, the positioning groove is configured as a cylindrical trapezoidal groove, and the shape of the protrusion matches the positioning groove.

[0008] Preferably, the centering mechanism comprises a movable platform rotatably arranged above the periphery of the surface of the lower positioning seat through a bearing ring, and a gear ring is fixedly installed below the surface of the movable platform.

[0009] Preferably, the centering mechanism further comprises a driving gear meshingly arranged on the right side of the gear ring surface, a driving motor is arranged below the surface of the driving gear, and the driving motor is fixedly installed above the surface of the side plate.

[0010] Preferably, the centering mechanism further comprises a slide groove opened above the surface of the movable platform, the slide grooves are opened with inclination in the same direction, and five slide grooves are evenly distributed above the surface of the movable platform.

[0011] Preferably, the centering mechanism also includes a movable rod slidably arranged inside the slide groove, the shape of the movable rod is set to be "L" shape, the upper end of the movable rod slides through the positioning cylinder, and a push plate is fixedly installed inside the positioning cylinder.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model can push the upper positioning seat to the center through the arrangement of the centering mechanism, the movable table, the gear ring, the driving gear, the driving motor, the slide groove, the movable rod and the push plate, so as to ensure that the lower positioning seat and the upper positioning seat are vertically and accurately relative to each other in the middle axis, thereby greatly improving the positioning accuracy and efficiency of the core;

[0014] 2. The utility model arranges the positioning cylinder, the positioning groove and the protrusion. The positioning cylinder can quickly determine the relative positioning position of the upper positioning seat and the lower positioning seat without manual comparison, thereby improving the positioning efficiency. The positioning groove and the protrusion arranged in a columnar trapezoid can make the upper positioning seat stably and quickly positioned with the lower positioning seat. Even if the upper positioning seat tilts during the process of mold closing after the alignment is completed, the mutual pushing force of the inclined surfaces can be used to form a level after the upper positioning seat and the lower positioning seat are closed, thereby further accurately positioning and improving the stability of mold closing positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall front view and cross-sectional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the lower positioning seat of the utility model from top view;

[0017] Figure 3 It is a schematic diagram of the structure of the upper positioning seat and the lower positioning seat of the utility model.

[0018] In the figure: 1, lower positioning seat; 2, positioning groove; 3, upper positioning seat; 4, protrusion; 5, positioning cylinder; 6, side plate; 7, centering mechanism; 701, movable table; 702, gear ring; 703, driving gear; 704, driving motor; 705, slide groove; 706, movable rod; 707, push plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1-Figure 3 As shown, a core positioning device for precision casting includes a lower positioning seat 1, a positioning groove 2 is opened in the middle of the upper surface of the lower positioning seat 1, an upper positioning seat 3 is arranged above the lower positioning seat 1, a protrusion 4 is fixedly installed below the surface of the upper positioning seat 3, a positioning cylinder 5 is fixedly installed at the upper edge of the surface of the lower positioning seat 1, a side plate 6 is fixedly installed below the right side of the surface of the lower positioning seat 1, a centering mechanism 7 is arranged on the surface of the lower positioning seat 1, the positioning groove 2 is arranged as a cylindrical trapezoidal groove, and the shape of the protrusion 4 matches the positioning groove 2, the centering mechanism 7 includes a movable table 701 rotatably arranged above the surface of the lower positioning seat 1 by a bearing ring, and a gear ring is fixedly installed below the surface of the movable table 701 702, the centering mechanism 7 also includes a driving gear 703 meshingly arranged on the right side of the surface of the gear ring 702, a driving motor 704 is arranged below the surface of the driving gear 703, and the driving motor 704 is fixedly installed above the surface of the side plate 6, the centering mechanism 7 also includes a slide groove 705 opened above the surface of the movable table 701, the slide grooves 705 are opened in the same direction, and five slide grooves 705 are evenly distributed above the surface of the movable table 701, the centering mechanism 7 also includes a movable rod 706 slidably arranged inside the slide groove 705, the shape of the movable rod 706 is set to be "L" shape, the upper end of the movable rod 706 slides through the positioning cylinder 5, and a push plate 707 is fixedly installed inside the positioning cylinder 5.

[0021] Furthermore, the movable platform 701 and the lower positioning seat 1 rotate through the bearing ring, and the gear ring 702 and the driving gear 703 are engaged, and the driving motor 704 can be used to rotate, thereby adjusting the position of the slide slot 705.

[0022] Furthermore, the slide groove 705 is arranged obliquely, and as the position of the slide groove 705 changes, the movable rod 706 is pulled or pushed under the limit of the movable rod 706 by the penetration part of the positioning tube 5, and extends forward and backward synchronously, driving the push plate 707 to move synchronously.

[0023] Furthermore, the push plates 707 on each surface of the push plate 707 positioning tube 5 move synchronously, which can ensure that the upper positioning seat 3 is located above the lower positioning seat 1 and vertically opposite to each other along the midline, thereby greatly improving the downward movement accuracy of the upper positioning seat 3 and the core positioning accuracy of the lower positioning seat 1.

[0024] Furthermore, the positioning cylinder 5 is located above the surface edge of the lower positioning seat 1, extending the upper receiving distance of the lower positioning seat 1, so that the approximate relative positioning position of the upper positioning seat 3 and the lower positioning seat 1 can be quickly determined, and also ensures that the upper positioning seat 3 is absolutely within the working range of the centering mechanism 7.

[0025] Furthermore, the positioning grooves 2 and protrusions 4 arranged in a columnar trapezoidal shape can enable the upper positioning seat 3 to be stably and quickly positioned with the lower positioning seat 1. Even if tilting occurs during the process of completing the alignment and lower mold closing, the mutual pushing force of the inclined surfaces can be utilized to form a level surface after the upper positioning seat 3 and the lower positioning seat 1 are molded together, thereby achieving further precise positioning.

[0026] Working principle: When using the core positioning device for precision casting, first, hoist the upper positioning seat 3 to move above the lower positioning seat 1, drop it into the positioning cylinder 5, and then drive the driving gear 703 to rotate through the driving motor 704, drive the gear ring 702 to rotate, so that the movable table 701 rotates, adjust the position of the slide slot 705, and use the oblique slide slot 705 to push each movable rod 706 to gradually move toward the middle, push each push plate 707 to move toward the middle synchronously, and push the upper positioning seat 3 is centered, so that the lower positioning seat 1 and the upper positioning seat 3 are vertically and accurately opposite to each other along the central axis. After the centering is aligned, the upper positioning seat 3 can continue to be hoisted and moved down to be molded with the lower positioning seat 1. The positioning groove 2 and the protrusion 4 set in the columnar trapezoid are used, and the inclined surface slides in relatively quickly to improve the mold-fitting positioning efficiency. At the same time, if tilting occurs during the lower mold-fitting process, the mutual pushing force of the inclined surfaces can also be used to form a horizontal state after the upper positioning seat 3 and the lower positioning seat 1 are molded. This is the working principle of the core positioning device for precision casting.

Claims

1. A core positioning device for precision casting, comprising a lower positioning seat (1), characterized in that: A positioning groove (2) is provided in the middle of the upper surface of the lower positioning seat (1); an upper positioning seat (3) is provided above the lower positioning seat (1); a protrusion (4) is fixedly installed below the surface of the upper positioning seat (3); a positioning cylinder (5) is fixedly installed at the upper edge of the surface of the lower positioning seat (1); a side plate (6) is fixedly installed below the right side of the surface of the lower positioning seat (1); and a centering mechanism (7) is provided on the surface of the lower positioning seat (1).

2. A core positioning device for precision casting according to claim 1, characterized in that: The positioning groove (2) is configured as a cylindrical trapezoidal groove, and the shape of the protrusion (4) matches the positioning groove (2).

3. A core positioning device for precision casting according to claim 1, characterized in that: The centering mechanism (7) comprises a movable platform (701) rotatably arranged above the surface of the lower positioning seat (1) via a bearing ring, and a gear ring (702) is fixedly installed below the surface of the movable platform (701).

4. A core positioning device for precision casting according to claim 1, characterized in that: The centering mechanism (7) further comprises a driving gear (703) meshedly arranged on the right side of the surface of the gear ring (702); a driving motor (704) is arranged below the surface of the driving gear (703); and the driving motor (704) is fixedly mounted above the surface of the side plate (6).

5. A core positioning device for precision casting according to claim 1, characterized in that: The centering mechanism (7) further comprises a slide groove (705) opened above the surface of the movable platform (701), wherein the slide groove (705) is opened in the same direction and tilted, and five slide grooves (705) are evenly distributed above the surface of the movable platform (701).

6. A core positioning device for precision casting according to claim 1, characterized in that: The centering mechanism (7) further comprises a movable rod (706) slidably arranged inside the slide groove (705), the movable rod (706) being arranged in an "L" shape, the upper end of the movable rod (706) slidingly passing through the positioning tube (5), and a push plate (707) being fixedly installed inside the positioning tube (5).

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