A mold core for pipe bending casting

Abstract

The present invention relates to the field of casting mold technology, and more particularly to a mold core for pipe bend casting, comprising a vertical mold core, a transverse mold core, and vertical left inserts, vertical right inserts, transverse left inserts, and transverse right inserts embedded in the elbow connection between the vertical and transverse mold cores to form a complete elbow. The present invention is primarily used as a mold core for injection-molded wax mold pipe bends, but can also be used as a casting mold core for other castings. The mold core, when combined with a workpiece-shaped outer mold, can cast a complete wax mold or workpiece in one go. The combined structure can be disassembled and removed from the wax mold or casting, allowing for reuse, thereby reducing costs and increasing efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of casting molds, in particular to a mold core used for casting bent pipes. Background Art

[0002] Bend pipes, especially Figure 1 The elbow with straight pipes at both ends shown is widely used in important transition parts of various pipelines in the industrial field. Its production generally adopts welding and casting. The casting is usually cut along the center line of the elbow as the parting surface, that is, the outer mold of the cast elbow is divided into upper and lower molds, and the cavity cross-section of the upper and lower molds is semicircular. The mold core generally adopts a sand core or other structure that is easy to break and clean after casting. This casting method is mostly used for non-precision casting; in precision casting such as wax mold casting, because a complete wax mold needs to be made first, according to the above method, the disposable mold core increases the production cost, and first pressing two semicircular wax molds, and then assembling and repairing the mold increases the difficulty and cost, and it is also difficult to ensure the quality of the wax mold. Summary of the Invention

[0003] The purpose of the present invention is to provide a mold core for casting a bent pipe in order to address the deficiencies of the prior art. The mold core is provided with a combined mold core which can be reused and can be easily removed from the bent pipe.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a mold core for casting bent pipes, including a vertical mold core, a horizontal mold core, and a vertical left insert, a vertical right insert, a horizontal left insert and a horizontal right insert embedded in the elbow connection between the vertical mold core and the horizontal mold core to form a complete elbow.

[0005] Furthermore, the vertical mold core includes an angled elbow A, a plug A, and a straight section A connecting the angled elbow A and the plug A; the horizontal mold core includes an angled elbow B, a plug B, and a straight section B connecting the angled elbow B and the plug B.

[0006] Furthermore, the angled elbow A includes a vertical left embedding groove arranged on both sides of the inner bend for embedding the vertical left insert and a vertical right embedding groove for embedding the vertical right insert. The vertical left embedding groove and the vertical right embedding groove are symmetrical, and the cutting inclined surface of the angled elbow A is provided with a mortise and tenon groove.

[0007] Furthermore, the angled elbow B includes a horizontal left embedding groove arranged on both sides of the inner bend for embedding the horizontal left insert and a horizontal right embedding groove for embedding the horizontal right insert. The horizontal left embedding groove and the horizontal right embedding groove are symmetrical, and the cutting inclined surface of the angled elbow B is provided with a tenon that engages with the tenon groove.

[0008] Furthermore, the vertical left embedded groove and the vertical right embedded groove are respectively composed of a horizontal bottom surface and two outwardly extending vertical inclined surfaces, one of which intersects the symmetry plane of the bevel elbow A and the outer peripheral surface of the bevel elbow A on the same straight line, and the other vertical inclined surface intersects the 90° rotation surface of the symmetry plane of the bevel elbow A and the outer peripheral surface of the bevel elbow A on the same straight line.

[0009] Furthermore, the sector angles corresponding to the bevel elbow A and the bevel elbow B are less than 60°.

[0010] The beneficial effects of the present invention are: a mold core for pipe bending casting, comprising a vertical mold core, a horizontal mold core, and vertical left inserts, vertical right inserts, horizontal left inserts, and horizontal right inserts embedded in the elbow connection between the vertical mold core and the horizontal mold core to form a complete elbow. The present invention is mainly used as a mold core for injection molding wax mold pipe bending, and can also be used as a casting mold core for other castings. The mold core, when combined with a workpiece-shaped outer mold, can cast a complete wax mold or workpiece in one go. The combined structure can be disassembled and removed from the wax mold or casting, and thus can be reused, thereby reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a main view of a pipe bend;

[0012] Figure 2 It is a three-dimensional diagram of a mold core for casting a bent pipe according to the present invention;

[0013] Figure 3 This is a front view of a mold core for casting a bent pipe according to the present invention;

[0014] Figure 4 yes Figure 3 Left view of;

[0015] Figure 5 yes Figure 3 Right view of;

[0016] Figure 6 It is a schematic diagram of the outer mold structure adapted to the present invention.

[0017] Description of reference numerals:

[0018] 1 - vertical mold core, 11 - bevel elbow A, 111 - vertical left embedding groove, 112 - vertical right embedding groove, 113 - mortise, 12 - plug A, 13 - straight section A, 2 - horizontal mold core, 21 - bevel elbow B, 211 - horizontal left embedding groove, 212 - horizontal right embedding groove, 213 - tenon, 22 - plug B, 23 - straight section B, 3 - vertical left insert, 4 - vertical right insert, 5 - horizontal left insert, 6 - horizontal right insert. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of implementation of the present invention is not limited thereto.

[0020] like Figure 2-5 As shown, a mold core for bent pipe casting in this embodiment includes a vertical mold core 1, a horizontal mold core 2, and a vertical left insert 3, a vertical right insert 4, a horizontal left insert 5 and a horizontal right insert 6 embedded in the elbow connection between the vertical mold core 1 and the horizontal mold core 2 to form a complete elbow.

[0021] The present invention is mainly used for casting an integrated elbow with straight tubes at both ends. For example, when wax mold is pressed, the wax mold elbow with straight tubes at both ends can be directly pressed without assembly; when aluminum alloy is cast, the aluminum elbow with straight tubes at both ends can be directly cast; of course, for different pressing or casting, the material used for the mold core is different, so as to maintain its shape while not being fused or solidified.

[0022] The specific principle utilized by the present invention is to cut the elbow into two sections with an inclined surface, and the fan-shaped angles corresponding to the two sections of the elbow generally do not exceed 60°. Then the inner bends of the two sections of the elbow are dug out and filled with inserts, and the dug-out elbows no longer have barbs at the inner bends, so that the two sections of the elbows can be taken out of the elbow by moving in a straight line. Here, the elbow cutting can be symmetrical or asymmetrical. The dug-out part of the cut elbow can be the entire inner bend with barbs, or it can be grooves dug on both sides of the inner bend. When the grooves are dug separately, the two grooves are generally symmetrical, and the barbs must be dug out. The filler inserts after the inner bends of the two sections of the elbows are dug out can be upper and lower pieces, or left and right pieces. According to needs, it can also be split into more pieces to facilitate the removal of the mold core from the elbow.

[0023] This embodiment uses the mold core used for injection molding a 90° wax mold elbow as an example, adopting symmetrical splitting, that is, the fan-shaped angles corresponding to the two elbow sections after splitting are both 45°, and the embedding grooves dug on both sides are also symmetrical. When using it, first, the vertical mold core 1 and the horizontal mold core 2 are brought together at right angles, and the vertical left insert 3 and the vertical right insert 4 are inserted into the vertical mold core 1, and the horizontal left insert 5 and the horizontal right insert 6 are inserted into the horizontal mold core 2. By using mortise and tenon joints and mutual extrusion, a complete elbow mold core with a straight section is formed and suspended between the upper and lower molds. After the injection molding is completed, the vertical mold core 1 and the horizontal mold core 2 are first removed by moving them vertically and horizontally, and then the vertical left insert 3, the vertical right insert 4, the horizontal left insert 5, and the horizontal right insert 6 are poured out of the wax mold.

[0024] In order to prevent the molten wax from flowing out of the gap, and to facilitate the installation of the vertical mold core 1 and the transverse mold core 2 when there is no external support, the vertical mold core 1 includes an angled elbow A11, a plug A12, and a straight section A13 connecting the angled elbow A11 and the plug A12; the transverse mold core 2 includes an angled elbow B21, a plug B22, and a straight section B23 connecting the angled elbow B21 and the plug B22. The diameter of the plug A12 is larger than the diameter of the straight section A13, and the diameter of the plug B22 is larger than the diameter of the straight section B23. The corresponding outer mold is structurally as follows: Figure 6 A stepped design is performed to form support for the vertical mold core 1 and the horizontal mold core 2, and the two are combined to form a seal for the external mold cavity.

[0025] The bevel elbow A11 includes a vertical left embedding groove 111 for embedding the vertical left insert 3 and a vertical right embedding groove 112 for embedding the vertical right insert 4, provided on both sides of the inner curve. The vertical left embedding groove 111 and the vertical right embedding groove 112 are symmetrical, and the cutting slope of the bevel elbow A11 is provided with a tenon 113. The bevel elbow B21 includes a horizontal left embedding groove 211 for embedding the horizontal left insert 5 and a horizontal right embedding groove 212 for embedding the horizontal right insert 6, provided on both sides of the inner curve. The horizontal left embedding groove 211 and the horizontal right embedding groove 212 are symmetrical, and the cutting slope of the bevel elbow B21 is provided with a tenon 213 that engages with the tenon 113. The tenon 113 and the tenon 213 engage with each other to provide mutual support, preventing the mold core from sagging due to gravity.

[0026] To facilitate translational removal of the vertical mold core 1 and the horizontal mold core 2 without interference from the insert, all the insert grooves are designed with a large draft angle. Specifically, the vertical left insert groove 111 and the vertical right insert groove 112 each consist of a horizontal bottom surface and two outwardly extending vertical inclined surfaces. The horizontal left insert groove 211 and the horizontal right insert groove 212 also consist of a bottom surface and two outwardly extending inclined surfaces. One of the two inclined surfaces intersects the elbow's symmetry plane and the elbow's outer circumference on the same straight line, while the other intersects the elbow's 90° rotational plane of the symmetry plane and the elbow's outer circumference on the same straight line. The 90° rotational plane can be a rotational plane greater than or less than 90°, preferably so as not to interfere with the removal of the insert.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A mold core for elbow casting, characterized by: It includes a vertical mold core, a transverse mold core, and a vertical left insert, a vertical right insert, a transverse left insert and a transverse right insert which are embedded in the elbow connection between the vertical mold core and the transverse mold core to form a complete elbow; The vertical mold core includes an angled elbow A, a plug A, and a straight section A connecting the angled elbow A and the plug A; the horizontal mold core includes an angled elbow B, a plug B, and a straight section B connecting the angled elbow B and the plug B. The diameter of the plug A is larger than the diameter of the straight section A, and the diameter of the plug B is larger than the diameter of the straight section B. The bevel elbow A includes a vertical left embedding groove for embedding the vertical left embedding piece and a vertical right embedding groove for embedding the vertical right embedding piece, which are provided on both sides of the inner bend. The vertical left embedding groove and the vertical right embedding groove are symmetrical. The cutting inclined surface of the bevel elbow A is provided with a tongue and groove. The angled elbow B includes a horizontal left embedding groove and a horizontal right embedding groove arranged on both sides of the inner bend for embedding the horizontal left insert, and a horizontal right embedding groove for embedding the horizontal right insert. The horizontal left embedding groove and the horizontal right embedding groove are symmetrical, and the cutting inclined surface of the angled elbow B is provided with a tenon that engages with the tenon groove.

2. A mold core for casting a bent pipe according to claim 1, characterized in that: The vertical left embedded groove and the vertical right embedded groove are respectively composed of a horizontal bottom surface and two outwardly extending vertical inclined surfaces, one of which intersects the symmetry plane of the bevel elbow A and the outer peripheral surface of the bevel elbow A on the same straight line, and the other vertical inclined surface intersects the 90° rotation surface of the symmetry plane of the bevel elbow A and the outer peripheral surface of the bevel elbow A on the same straight line.

3. A mold core for casting a bent pipe according to claim 2, characterized in that: The sector angles corresponding to the bevel elbow A and the bevel elbow B are less than 60°.

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