CN201575761U

CN201575761U - Die section of crimping mold for shell crimping

Info

Publication number: CN201575761U
Application number: CN200920294004XU
Authority: CN
Inventors: 周晓鹏; 赵义满
Original assignee: Chongqing Changan Industry Group Co Ltd
Current assignee: Chongqing Changan Industry Group Co Ltd
Priority date: 2009-12-21
Filing date: 2009-12-21
Publication date: 2010-09-08
Anticipated expiration: 2019-12-21

Abstract

The utility model provides a die section of a crimping mold for shell crimping. The die section is provided with a raised stress application shank at the front part thereof, the working face at the front end of the stress application shank consists of one section of plane surface in the middle and two sections of cambered surfaces provided with equivalent width and connected with two sides of the plane surface on the left and the right, and the plane surface occupies one third of the width of the entire working face; the rest part at the front end of the stress application shank, except the working face, is rectangular; and the width of the stress application shank is the same as that of the rectangular part which is equal or greater than 40 percent and less than or equal to 70 percent of that of a pill crimping groove. By reducing the width of the stress application shank of the crimping mold, the utility model ensures that the wall of a cartridge case pressed into the pill crimping groove can not become thin, and the rigidity of the cartridge case can be ensured; the arc surface at the front end of the mold section of an original crimping mold is changed to be the plane surface occupying one third of the arc surface, so that friction between a large cartridge case and a pill can be increased, the cartridge case and the pill are enabled to be connected together firmly, and the bullet pull force can be enhanced.

Description

A kind of tight mouthful of mould mould lobe that is used for tight mouthful of shell

Technical field

The utility model relates to a kind of tight mouthful mould, is specifically related to tight mouthful of mould valve structure in the tight mouthful of mould that small-bore bullet assembling uses.

Background technology

Tight mouthful mould is the specific purpose tool that is used for tight mouthful of shell, and tightly mouthful mould lobe is the key job parts on the tight mouthful mould.What use now is vertical tight mouthful of mould, sees Fig. 1, and bullet 1 is contained in the mould, tight mouthful of mould lobe 2 is generally 6 lobes or 8 lobes, because the afterburning mode of the mechanical shock of using, so the tight mouthful time is short, the distortional stress of cartridge case 3 is concentrated, and all have higher requirements to tight mouthful of mould lobe.

At present, the full bullet of the assembling of small-bore bullet pulls out elastic force and generally all is lower than 30000N, and for example 25 series of products require 15000N, and 30 series are about 25000N, but just needs the elastic force that pulls out of 40000N nearly when new product 35 series, and tight mouthful of present mould lobe is difficult to guarantee.

Summary of the invention

The purpose of this utility model is to overcome deficiency of the prior art, provides a kind of simple in structure, is easy to processing and manufacturing, can guarantee the higher tight mouthful of mould lobe that pulls out elastic force of small-bore bullet.

A kind of tight mouthful of mould mould lobe that is used for tight mouthful of shell, the anterior lobed afterburning shin of described mould lobe, the working face of described afterburning shin front end by one section plane of center and be connected in the both sides, plane about two sections wait the width cambered surfaces to form, described plane accounts for 1/3 of entire working surface width; The part of described afterburning shin except that the front end working face is rectangle, and the width of afterburning shin is that the width of rectangle part is answered the tight mouthful well width of 〉=40% bullet, and≤the tight mouthful well width of 70% bullet.

The size of the afterburning shin at tight mouthful mould lobe of the present utility model and the shape of afterburning shin working face are improved: width that will the tight mouthful of afterburning shin of mould lobe reduces, and the cartridge wall that guarantee to be squeezed in the tight mouthful groove of bullet can attenuation, guarantees cartridge case rigidity; Changing the arc surface of former tight mouthful mould lobe front end into 1/3 cambered surface is a plane, so just can extrude the friction that knuckle has increased cartridge case and bullet, makes it cartridge case and more firm being linked together of bullet just can be able to be reached higher level so pull out elastic force.

Can of the present utility modelly have the following advantages: 1, reliability height, the life-span is long; 2, simple in structure, be easy to make, change slightly on the original basis, promptly can be made into; 3, processing effect is good, can guarantee the higher elastic force that pulls out.

Description of drawings

Fig. 1 is the work schematic diagram of vertical tight mouthful of mould of use now;

Fig. 2 is the schematic diagram that the afterburning shank of tight mouthful of mould lobe before improving divides;

Fig. 3 is a tight mouthful of improved mould lobe perspective view of the utility model;

Fig. 4 is the schematic diagram that the afterburning shank among Fig. 3 divides.

Among the figure: 1, bullet, 2, the mould lobe that links closely, 2, cartridge case, 4, afterburning shin, the afterburning shin of A plane, the afterburning shin cambered surface of B, the afterburning shin width of K

The specific embodiment

Below in conjunction with accompanying drawing the utility model is further described.

Referring to Fig. 2, the shape that the afterburning shank of tight mouthful of mould lobe before improving divides is an arc surface 5, the arc surface width is the same with the tight mouthful groove of bullet, cartridge wall can be extruded the tight mouthful groove of bullet, it is relatively more fragile that cartridge wall attenuation, cartridge case are stuck in the tight mouth of bullet groove, and therefore needing tightly, the width of mouthful afterburning shin of mould lobe reduces, and the shape that arc surface extrudes is smooth cambered surface, and is less with tight mouthful of groove frictional force of bullet.

Referring to Fig. 3, the utility model is not made change to the mould lobe body of tight mouthful of mould lobe, only changes the shape and size of the anterior protruding afterburning shin 4 of mould lobe.Specifically in conjunction with Fig. 4, the working face of afterburning shin 4 front ends be designed to by one section plane A of center and be connected in the both sides, plane about two sections wait width cambered surface B to form, plane A accounts for 1/3 of entire working surface width.So just can extrude the friction that knuckle has increased cartridge case and bullet, cartridge case is stuck in the tight mouthful groove of bullet, just can reach higher level so pull out elastic force, makes small-bore bullet pull out elastic force and can stablize above 40000N.The part of afterburning shin 4 except that the front end working face is rectangle, the width of afterburning shin is the tight mouthful well width of width K 〉=40% bullet of rectangle part, and tight mouthful of well width of≤70% bullet, the cartridge wall that can guarantee like this to be squeezed in the tight mouthful groove of bullet can attenuation, guarantees cartridge case rigidity.

Claims

1. one kind is used for tightly tight mouthful of mould mould lobe of mouth of shell, the anterior lobed afterburning shin of described mould lobe; It is characterized in that: the working face of described afterburning shin front end by one section plane of center and be connected in the both sides, plane about two sections wait the width cambered surfaces to form, described plane accounts for 1/3 of entire working surface width; The part of described afterburning shin except that the front end working face is rectangle, and the width of afterburning shin is that the width of rectangle part is answered the tight mouthful well width of 〉=40% bullet, and≤the tight mouthful well width of 70% bullet.