Background
When the epoxy casting insulator for the high-voltage switch equipment is manufactured, a longer pouring gate is often designed when a casting mold is designed based on shrinkage in the curing process of epoxy resin in order to realize casting and ensure the size and the appearance of the insulator. The casting mold for the basin-type insulator disclosed in the Chinese patent publication No. CN109940806B comprises a male mold and a female mold, wherein the male mold and the female mold are respectively provided with a cavity for forming a workpiece, the male mold and the female mold are fixedly assembled to form a cavity for forming the basin-type insulator, the mold is provided with a sprue communicated with the cavity, the sprue extends outwards for a longer length along the radial direction of the mold, epoxy resin casting material enters the cavity through the sprue for heating and curing treatment, the formed basin-type insulator is taken out after curing, and at the moment, the basin-type insulator is provided with an excessive protruding part protruding outwards along the radial direction, and the protruding part is required to be removed. The column insulator casting mold disclosed in the Chinese patent publication No. CN110653977B comprises a mold body, wherein the mold body is provided with a cavity for molding a workpiece, the axial direction of the cavity is consistent with the axial extension direction of the column insulator, the mold body is provided with a gate communicated with the cavity, the gate extends outwards for a longer length perpendicular to the axial direction of the cavity, epoxy resin enters the cavity through the gate, the molded column insulator is taken out after solidification, and at the moment, the column insulator is provided with an excessive protruding part which is consistent with the shape of the gate of the mold and protrudes outwards perpendicular to the axial direction of the insulator, and the protruding part is required to be removed.
When getting rid of the bellying, the present process is at first to use toothless saw to saw cut the bellying of insulator, then saw cut the position with abrasive paper and polish, and this process not only can probably cause mechanical damage to the insulator, still can produce a large amount of dust, noise, makes operating personnel's operation environment abominable, and bellying removal efficiency is low moreover.
Disclosure of utility model
The utility model aims to provide an epoxy resin casting mold, which solves the problems of low bulge removal efficiency and poor operation environment when the existing insulator casting mold removes redundant bulge on a workpiece after the workpiece is molded.
In order to achieve the purpose, the epoxy resin casting mold adopts the following technical scheme:
The utility model provides an epoxy pouring mold, includes the mould body, and the mould body has the shaping chamber that is used for shaping work piece, and shaping chamber intercommunication has the runner, the runner be close to root position and be equipped with the recess and form weak structure.
Further, the groove is provided with a circle along the position, close to the root, of the pouring gate.
Further, the groove is a ring groove.
Further, the bottom of the groove is provided with a sharp corner structure protruding inwards.
Further, the cross section of the sharp corner structure is V-shaped.
Further, the sharp corners of the sharp corner structures are rounded corners.
The epoxy resin casting mold has the beneficial effects that the epoxy resin casting mold is improved on the basis of the existing casting mold, a weak structure is formed by arranging the groove at the position close to the root of the pouring gate, the molded insulator is taken out after solidification is finished, at the moment, the insulator is provided with the redundant protruding part protruding outwards in accordance with the shape of the pouring gate of the mold, a circle of groove is formed at the position close to the root of the protruding part, namely the position close to the surface of the insulator, the weak structure is formed at the groove, the protruding part can be broken at the groove by only tapping with a small hammer, so that the redundant protruding part is removed, at the moment, only a small amount of protruding part remains on the insulator, and the insulator can be removed by polishing with sand paper. The epoxy resin casting mold changes the removing mode of the redundant protruding part on the insulator, can reduce the possible mechanical damage to the insulator in the removing process of the protruding part, and improves the removing efficiency of the protruding part.
Detailed Description
The features and capabilities of the present utility model are described in further detail below in connection with the examples.
The epoxy resin casting mold is improved on the basis of the existing insulator casting mold, and is mainly used for solving the problems that the existing insulator casting mold is poor in operation environment and low in boss removing efficiency because a toothless saw is needed to saw and sand paper is needed to grind when the redundant bosses on the insulator are removed after the insulator is molded.
The technical principle of the epoxy resin casting mold is that a weak structure is formed by arranging the groove at the position close to the root of the pouring gate of the mold, a circle of groove can be formed at the position close to the root of the redundant protruding part on the insulator after solidification, namely the position close to the surface of the insulator of the protruding part, the weak structure is formed at the groove, and the protruding part can be broken at the groove only by tapping with a small hammer, so that the redundant protruding part is removed. The toothless saw is not used for sawing, so that mechanical damage to the insulator possibly caused in the process of removing the protruding part is reduced, a large amount of dust or noise is not generated, the comfort of the working environment is kept, and the removing efficiency of the protruding part is improved.
Examples of the epoxy resin casting mold of the present utility model:
As shown in fig. 1, the epoxy resin casting mold comprises a mold body 1, wherein the mold body 1 is provided with a molding cavity 3 for molding a workpiece, the molding cavity 3 is communicated with a pouring gate 2, and a groove 201 is formed at a position, close to the root, of the pouring gate 2 to form a weak structure. The groove 201 is provided with a circle along the position, close to the root, of the gate 2, so that weak structure parts can be formed at the position, close to the root, of the gate 2 as much as possible, and the breaking of the protruding part at a plurality of weak structure parts is facilitated when the redundant protruding part is removed after solidification, so that the protruding part is removed more thoroughly, and the operation is more labor-saving. In a preferred embodiment, the groove 201 is a ring groove, so that a weak structure of a whole circle can be formed at the position close to the root of the gate 2, when the small hammer is used for knocking the protruding part, no special knocking position needs to be found, the same effect can be achieved when the protruding part is knocked at any position in the circumferential direction, the protruding part is removed more thoroughly, and the operation is more convenient and labor-saving. Of course, in other embodiments, the groove 201 may be an arc groove, and a plurality of arc grooves may be provided, and the plurality of arc grooves are arranged at intervals on the same circumference, and a circle of arc grooves is provided along the gate 2 near the root, where each arc groove forms a weak structure. Of course, the groove 201 may be provided with a half circle along the gate 2 near the root, and the groove 201 may be a half-ring groove.
In order to further reduce the structural strength at the recess 201, so that the bulge is more likely to break at the recess 201 when subjected to a force, an inwardly protruding pointed structure 202 is provided at the bottom of the recess 201, as shown in fig. 1. The lobe is broken at sharp angle structure 202 department when the atress, and sharp angle structure 202 is close to recess 201 bottom, can make the lobe take place the fracture position and be close to the lobe root more, and the lobe is got rid of the effect better, and is favorable to reducing follow-up polishing work load. The cross section of the sharp corner structure 202 is V-shaped, and the cross section is more beneficial to breaking at the sharp corner structure 202 when the protruding part is stressed, so that the protruding part removing effect is better. As can be seen from fig. 1, the sharp corners of the sharp corner structure 202 are rounded corners, which has the advantage of facilitating the flow of the epoxy casting material in the gate 2 and the post-curing formation.
Of course, in another embodiment, the sharp corners of the sharp corner structure 202 may be right angles. The cross section of the pointed structure 202 may be other structures, for example, one side of the cross section is a bevel inclined towards the root of the gate 2, and the other side is a right angle side extending along the axial direction of the gate 2. Of course, the sharp corner structure 202 is not required to be arranged at the groove 201, so that the inner diameters of all parts of the groove 201 are equal.
According to the epoxy resin casting mold, a weak structure is formed by arranging the groove 201 at the position close to the root of the pouring gate 2, the molded insulator is taken out after solidification is finished, at the moment, the insulator is provided with the redundant protruding part which protrudes outwards and is consistent with the shape of the pouring gate 2 of the mold, a circle of groove is formed at the position close to the root of the protruding part, namely the position close to the surface of the protruding part, of the insulator, the weak structure is formed at the groove, the protruding part can be broken at the groove only by tapping with a small hammer, so that the redundant protruding part is removed, at the moment, only a small quantity of protruding parts remain on the insulator, and the insulator can be removed by polishing with sand paper. The epoxy resin casting mold changes the removing mode of the redundant protruding part on the insulator, can reduce the possible mechanical damage to the insulator in the removing process of the protruding part, and improves the removing efficiency of the protruding part. The novel gate structure of the epoxy resin casting mold can be suitable for the design of epoxy insulator casting molds with various structures.
The following steps can be referred to when the epoxy resin casting mold is used for molding the insulator:
1) Cleaning a forming cavity of the die, and removing foreign matters, resin and the like;
2) Spraying a release agent on the surface of the molding cavity, and spraying a pouring gate part;
3) According to the insulator structure, installing an insulator insert, assembling a die in place, preheating, pushing a casting tank for casting, placing into a curing furnace for curing after casting, and demolding after curing is finished, wherein a groove is formed at the position, close to the root, of the redundant protruding part on the insulator;
4) The insulator after the demolding is removed from the bulge, the bulge is tapped by a hammer, the bulge is broken from the groove, and then the bulge remained on the insulator is polished.
The tooth-less saw is not used for sawing when the bulge is removed, so that the mechanical damage to the insulator possibly caused in the bulge removing process is reduced, a large amount of dust or noise is not generated, the comfort of the working environment can be kept, and the bulge removing efficiency is improved.
The above description is only a preferred embodiment of the present utility model, and the patent protection scope of the present utility model is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present utility model should be included in the protection scope of the present utility model.