CN212857632U

CN212857632U - Mould convenient to drawing of patterns

Info

Publication number: CN212857632U
Application number: CN202021346568.6U
Authority: CN
Inventors: 宿恒; 李金河; 廖春波; 黄雄文
Original assignee: Guilin Second Technical School
Current assignee: Guilin Second Technical School
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2021-04-02
Anticipated expiration: 2030-07-10

Abstract

The utility model relates to a die convenient for demoulding, which comprises an external die, a mandrel, a lower compression ring and an upper compression ring; the mandrel is positioned in the outer die, and a gap is reserved between the mandrel and the outer die to form a forming cavity of a product; the lower pressing ring and the upper pressing ring are oppositely arranged in the forming cavity from top to bottom, and the lower pressing ring and the upper pressing ring can be arranged in a sliding mode from top to bottom so as to press and form corresponding materials into products wrapped outside the middle portion of the mandrel; the mandrel is of a cylindrical structure formed by splicing a plurality of accessories, and the accessories sequentially form the mandrel along the radial direction and the circumferential direction. The utility model has the advantages that: guarantee that fashioned part can the drawing of patterns smoothly, avoid causing the damage of dabber when the drawing of patterns.

Description

Mould convenient to drawing of patterns

Technical Field

The utility model relates to a metal casting, powder metallurgy and plastic mold form technical field, concretely relates to mould convenient to drawing of patterns.

Background

With the change of the requirements of Chinese manufacturing, the requirements of metal casting, powder metallurgy and plastic mold forming parts in the industrial field are continuously improved, the sizes of a plurality of casting parts are required to be more accurate, and the wall thickness of the casting parts is thinner. For some thin-wall parts, the problems of high compactness of powder metallurgy and product cracking during demoulding of high-temperature and high-pressure cast parts cannot be solved. The invention of a novel mandrel structure is particularly urgent to adapt to the development of industrial technology.

As shown in fig. 1 and 2, most of the mandrel 8 structures in the current die forming industry mostly adopt a taper form, some parts which originally need straight holes cannot be formed at one time, the requirement on the precision of the processing surface of the taper mandrel 8 is high, in the high-temperature and high-pressure powder metallurgy industry, the taper is often tightly wrapped by the cast parts, and the thin-wall parts are easily damaged during demolding. After the mandrel 8 is used for multiple times, the surface is subjected to pitting and strain, the deformation straightness in the axial direction is reduced, and the product is cracked during demoulding.

SUMMERY OF THE UTILITY MODEL

To sum up, for overcoming prior art's not enough, the utility model aims to solve the technical problem that a mould convenient to drawing of patterns is provided.

The utility model provides an above-mentioned technical problem's technical scheme as follows: a die convenient for demoulding comprises an outer die, a mandrel, a lower pressure ring and an upper pressure ring; the mandrel is positioned in the outer die, and a gap is reserved between the mandrel and the outer die to form a forming cavity of a product; the lower pressing ring and the upper pressing ring are oppositely arranged in the forming cavity from top to bottom, and the lower pressing ring and the upper pressing ring can be arranged in a sliding mode from top to bottom so as to press and form corresponding materials into products wrapped outside the middle portion of the mandrel; the mandrel is of a cylindrical structure formed by splicing a plurality of accessories, and the accessories sequentially form the mandrel along the radial direction and the circumferential direction.

The utility model has the advantages that: the smooth demoulding of the formed part is ensured, and the damage of a mandrel or a product caused by demoulding is avoided.

On the basis of the technical scheme, the utility model discloses can also do as follows the improvement:

further, the mandrel comprises a first fitting, two second fittings and two third fittings; the first accessory is of a long-strip round table structure, and the second accessory and the third accessory are of arc block structures; the two second fittings and the two third fittings are spliced on the periphery of the first fitting, the inner sides of the second fittings and the third fittings are respectively attached to corresponding positions on the outer side of the first fitting, and then the first fitting, the two second fittings and the two third fittings are spliced into a solid cylinder; gaps are reserved between the second fitting and the third fitting and the outer die, and the forming cavity is formed.

The beneficial effect of adopting the further scheme is that: facilitating initial axial stripping of the first fitting along the mandrel.

Further, the two second fittings and the two third fittings are respectively disposed oppositely, and a distance between two opposite end faces of the two second fittings is L, and L becomes gradually smaller in a direction from an inner side to an outer side of the first fitting; two end faces of each third fitting respectively abut against corresponding end faces of the two second fittings.

The beneficial effect of adopting the further scheme is that: after the first accessory is demoulded, the third accessory and the second accessory are demoulded along the radial direction of the mandrel in sequence.

Drawings

FIG. 1 is a top view of a conventional mold formed product;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a top view of the molded product of the present invention;

FIG. 4 is a cross-sectional view B-B of FIG. 3;

fig. 5(a) - (e) are the step diagrams of the demolding of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the die comprises an outer die, 2, a lower pressing ring, 3, an upper pressing ring, 4, a first accessory, 5, a second accessory, 6, a third accessory, 7, a product, 8 and a mandrel.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 3 and 4, a mold for facilitating demolding comprises an outer mold 1, a mandrel, a lower press ring 2 and an upper press ring 3. The mandrel is inside the outer die 1, and a gap is left between the mandrel and the outer die 1 to form a forming cavity of a product 7. Lower clamping ring 2 with go up clamping ring 3 relative about be in the shaping chamber, and lower clamping ring 2 with go up clamping ring 3 and slide the setting from top to bottom so that with corresponding material compression moulding for the parcel be in product 7 outside the dabber middle part. The mandrel is characterized in that the mandrel is of a cylindrical structure formed by splicing a plurality of accessories, and the accessories sequentially form the mandrel along the radial direction and the circumferential direction.

The mandrel comprises a first fitting 4, two second fittings 5 and two third fittings 6. The first accessory 4 is of a long strip circular truncated cone structure, and the second accessory 5 and the third accessory 6 are of arc block structures. The two second fittings 5 and the two third fittings 6 are spliced on the periphery of the first fitting 4, the inner sides of the second fittings 5 and the third fittings 6 are respectively attached to corresponding positions on the outer side of the first fitting 4, and then the first fitting 4, the two second fittings 5 and the two third fittings 6 are spliced into a solid cylinder. The second part 5 and the third part 6 leave a gap with the outer die 1 and form the molding cavity. The two second fittings 5 and the two third fittings 6 are respectively disposed oppositely, and a distance between opposite end faces of the two second fittings 5 is L, and L becomes gradually smaller in a direction from the inside to the outside of the first fitting 4. Two end faces of each third fitting part 6 respectively abut against corresponding end faces of the two second fitting parts 5.

The mold is described as a complete demolding process:

step one, as shown in fig. 5(a), placing a mold on a corresponding backing ring 10, then axially pressing down a mandrel, a lower pressing ring 2, a product 7 and an upper pressing ring 3 of the mold through a corresponding cylinder 9, so that the mandrel, the lower pressing ring 2, the product 7 and the upper pressing ring 3 are separated from an outer mold 1 of the mold and are demolded, and an assembly formed by the mandrel, the lower pressing ring 2, the product 7 and the upper pressing ring 3 is obtained;

step two, as shown in fig. 5(b), placing the assembly obtained in the step one on a corresponding backing ring 10, and then axially pressing down the first fitting 4 through a corresponding cylinder 9 (the upper end of the first fitting 4 is small and the lower end is large), so that the first fitting 4 is separated from the second fitting 5, the third fitting 6, the lower pressing ring 2, the product 7 and the upper pressing ring 3, and demolding is performed to obtain an assembly formed by the second fitting 5, the third fitting 6, the lower pressing ring 2, the product 7 and the upper pressing ring 3; in the demoulding process, because the first fitting 4 has a certain taper, the cylinder 9 can press the first fitting 4 downwards to be easier to demould;

step three, as shown in fig. 5(c), prying the outer side of the end of the third fitting 6 in the assembly obtained in the step two towards the inner side of the mandrel by using a special tool 11, so that the third fitting 6 slides inwards along the radial direction of the mandrel to realize demolding, and further obtaining an assembly formed by the second fitting 5, the lower pressing ring 2, the product 7 and the upper pressing ring 3; during this demolding, since the distance between the two opposing end faces of the two second fittings 5 becomes gradually smaller in the direction from the inside to the outside of the first fitting 4, that is, one end between the two opposing end faces of the two second fittings 5 near the inside of the mandrel is wider, and the other end thereof is narrower, the third fitting 6 slides more easily inward in the radial direction of the mandrel;

step four, as shown in fig. 5(d), a tool 11 with a special working end as a tip is used to pry the outer side of the end of the second fitting 5 in the assembly obtained in the step three towards the inner side of the mandrel, so that the second fitting 5 slides inwards along the radial direction of the mandrel to realize demolding, and then an assembly formed by the lower compression ring 2, the product 7 and the upper compression ring 3 is obtained; during this demoulding, the second fitting 5 is easily able to slide radially inwards along the mandrel, since the stresses have been relieved;

and step five, as shown in fig. 5(e), slightly knocking off the lower pressing ring 2 and the upper pressing ring 3 in the assembly obtained in the step four along the radial direction (arrow direction) of the mandrel, and finally obtaining a product 7, so that the demolding operation is finished.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A die convenient for demoulding comprises an outer die (1), a mandrel, a lower pressing ring (2) and an upper pressing ring (3); the mandrel is positioned in the outer die (1), and a gap is reserved between the mandrel and the outer die (1) to form a forming cavity for forming a product (7); the lower pressing ring (2) and the upper pressing ring (3) are oppositely arranged in the forming cavity from top to bottom, and the lower pressing ring (2) and the upper pressing ring (3) can be arranged in a sliding mode from top to bottom to press and form corresponding materials into a product (7) wrapped outside the middle portion of the mandrel; the mandrel is characterized in that the mandrel is of a cylindrical structure formed by splicing a plurality of accessories, and the accessories sequentially form the mandrel along the radial direction and the circumferential direction.

2. Mould facilitating demoulding according to claim 1, wherein the mandrel comprises a first part (4), two second parts (5) and two third parts (6); the first accessory (4) is of a long-strip circular truncated cone structure, and the second accessory (5) and the third accessory (6) are of arc block structures; the two second fittings (5) and the two third fittings (6) are spliced on the periphery of the first fitting (4), the inner sides of the second fittings (5) and the third fittings (6) are respectively attached to corresponding positions on the outer side of the first fitting (4), and then the first fitting (4), the two second fittings (5) and the two third fittings (6) are spliced into a solid cylinder; gaps are reserved between the second part (5) and the third part (6) and the outer die (1) and form the molding cavity.

3. The mold for facilitating demolding according to claim 2, wherein two of the second fittings (5) and two of the third fittings (6) are respectively disposed oppositely, and a distance between opposite end faces of the two second fittings (5) is L, and L becomes gradually smaller in a direction from an inner side to an outer side of the first fitting (4); two end faces of each third fitting part (6) are respectively attached to corresponding end faces of the two second fitting parts (5).