CN-111138765-B - Elastic die sleeve

Abstract

The inner surface of the elastic die sleeve and the core rod penetrating through the inner surface of the elastic die sleeve form a cavity, the shielding pipe colloid is injected into the cavity, the outer surface of the shielding pipe colloid is solidified and molded, the shielding pipe is free of a die joint, the elastic die sleeve and the shielding pipe colloid are made of two incompatible materials, and the elastic die sleeve is made of a soft elastomer so as to be stripped from the shielding pipe. The invention replaces the traditional split type combined die, the outer surface of the formed shielding pipe is free of a die joint, the flash polishing procedure is omitted, the quality problems caused by polishing and the potential accidents such as discharging and breakdown are avoided, and the elastic die sleeve is made of a material incompatible with the colloid of the shielding pipe, so that the requirement of forming the shielding pipe is met, and the later stripping is facilitated. The elastic die sleeve can be repeatedly used, and the manufactured shielding pipe, the prefabricated main body of the middle joint and the middle joint have good quality and are safe to use.

Inventors

• SHEN WEIDONG
• WU JUEHENG
• MA ZHIJIN
• ZHANG BAOLEI
• MIAO WEITING
• WAN CHANG
• BAI XIAOYE

Assignees

• 江苏中天科技电缆附件有限公司

Dates

Publication Date

20260505

Application Date

20181106

Claims (9)

1. 1. An elastic die sleeve is characterized in that the inner surface of the elastic die sleeve and the outer surface of a core rod penetrating through the inner part of the elastic die sleeve form a cavity, a glue injection port formed in one side edge of the core rod is used for injecting a shielding pipe colloid into the cavity to solidify and mold a shielding pipe with no seam on the outer surface, the elastic die sleeve and the shielding pipe colloid are made of two incompatible materials, and the elastic die sleeve is made of a soft elastomer so as to realize stripping from the shielding pipe; the elastic die sleeve is sleeve-shaped, the inner surface of the elastic die sleeve is smooth and seamless, and the end part of the elastic die sleeve contracts inwards of the inner surface.
2. 2. The elastomeric die sleeve of claim 1 wherein said elastomeric die sleeve is EPDM and in use meets the following conditions:
3. 3. the elastic die sleeve according to claim 2, wherein the elastic die sleeve comprises the following components in parts by weight:
4. 4. the elastic die sleeve of claim 3, wherein the filler comprises one or more of kaolin, talcum powder, white carbon black, calcium carbonate and diatomite.
5. 5. The elastomeric die sleeve of claim 3 wherein said peroxide curative comprises one or more combinations of DCP, BPO, BPMC, DBPMH, BIPB.
6. 6. The elastomeric die sleeve of claim 3 wherein said active agent comprises one or more of stearic acid, linoleic acid, oleic acid.
7. 7. The elastic die sleeve of claim 3, wherein the oil comprises one or more of white oil, naphthenic oil and transformer oil.
8. 8. The elastic die sleeve of claim 1, wherein the elastic die sleeve is silica gel or fluorine gel, and the performance of the elastic die sleeve meets the following conditions in use:
9. 9. the elastic die sleeve of claim 2 or 8, wherein the elastic die sleeve is reusable.

Description

Elastic die sleeve Technical Field The invention relates to the technical field of seamless manufacturing, in particular to an elastic die sleeve for seamless molding. Background This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section. The main insulating parts are formed by adopting silica gel and Ethylene Propylene Diene Monomer (EPDM) materials, and the forming process is generally that firstly, a parting mold is adopted to form a conductive cone and a conductive tube, then the conductive cone and the conductive tube are assembled into a mold to carry out the glue injection of the insulating glue, after the glue injection is finished, the insulating glue is heated and cured on an oven or a mold locking tool, and after cooling, the insulating glue is demolded and flash is removed, so that the qualified product can be obtained. The forming die of the conductive cone and the conductive tube is of a parting structural formula, a plurality of burrs are generated after forming, particularly, a joint shielding tube (conductive tube) is formed, polishing treatment of the burrs becomes an indispensable process, and because the silica gel is softer and elastic in hardness, polishing difficulty is high, on one hand, the burrs are difficult to polish cleanly, on the other hand, the required shape and performance of a product are guaranteed, on the other hand, tissues around the burrs can be polished simultaneously for polishing cleanly, partial concave conditions are generated after polishing, and no method is available for completely removing protrusions of the burrs during polishing, and the joint product can be discharged under the action of an electric field due to uncleanness of the burrs, so that product breakdown accidents are finally caused. Disclosure of Invention In view of the above, it is necessary to provide an elastic die sleeve for manufacturing a shielding pipe without flash and die joint, so as to effectively improve the qualification rate of the shielding pipe and effectively avoid potential safety accidents. The technical scheme includes that the inner surface of the elastic die sleeve and a core rod penetrating through the inner surface of the elastic die sleeve form a cavity, a shielding pipe with a shielding pipe colloid solidified and formed by the cavity and a shielding pipe with an outer surface without a die joint is injected into the cavity, the elastic die sleeve and the shielding pipe colloid are made of two incompatible materials, and the elastic die sleeve is made of a soft elastomer so as to be stripped from the shielding pipe. Further, the elastic die sleeve is EPDM, and the performance of the elastic die sleeve meets the following conditions in use: Further, the elastic die sleeve comprises the following components in parts by weight: Further, the filler comprises one or more of kaolin, talcum powder, white carbon black, calcium carbonate and diatomite. Further, the peroxide curative comprises one or more combinations of DCP, BPO, BPMC, DBPMH, BIPB. Further, the active agent comprises one or more of stearic acid, linoleic acid, oleic acid. Further, the oil comprises one or more of white oil, naphthenic oil, transformer oil. Further, the elastic die sleeve is silica gel or fluorine gel, and the performance of the elastic die sleeve meets the following conditions in use: Further, the elastic die sleeve can be reused multiple times. Further, the elastic die sleeve is sleeve-shaped, the inner surface of the elastic die sleeve is smooth and seamless, and the end part of the elastic die sleeve contracts inwards of the inner surface. Compared with the prior art, the elastic die sleeve provided by the invention has the advantages that the inner surface of the elastic die sleeve and the core rod sleeved in the elastic die sleeve form a cavity, the shielding pipe colloid is injected into the cavity, the outer surface of the shielding pipe colloid is solidified and molded, the shielding pipe is free of a die joint, the elastic die sleeve and the shielding pipe colloid are made of two incompatible materials, and the elastic die sleeve is made of a soft elastomer so as to realize stripping from the shielding pipe. The invention replaces the traditional split type combined die, the outer surface of the formed shielding pipe is free of a die joint, the flash polishing procedure is omitted, the quality problems caused by polishing and the potential accidents such as discharging and breakdown are avoided, and the elastic die sleeve is made of a material incompatible with the colloid of the shielding pipe, so that the requirement of forming the shielding pipe is met, and the later stripping is facilitated. Moreover, the elastic die sleeve provided by the invention can be repeatedly used, the utilization rate is high, and the manufactured shielding