CN209902168U

CN209902168U - Special preforging die for ball valve end cover blank

Info

Publication number: CN209902168U
Application number: CN201920573123.2U
Authority: CN
Inventors: 吴克成; 周亚夫; 杨柳
Original assignee: Sichuan Hongxin Energy Equipment Manufacturing Co Ltd
Current assignee: Sichuan Hongxin Energy Equipment Manufacturing Co Ltd
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2020-01-07
Anticipated expiration: 2029-04-24

Abstract

The utility model discloses a special preforging die of ball valve end cover blank, including lower die, have vertical "T" die cavity of lining up in the lower die, still include centering sleeve and the drift with the coaxial setting of lower die, the bottom of centering sleeve has the surrounding edge, and centering sleeve arranges the lower die top in, and passes through the top of die covers down in the surrounding edge, the drift is vertical to be passed the centering sleeve and stretches into the upper portion of "T" die cavity to the lateral wall of drift and the inner wall laminating of centering sleeve, the bottom surface of drift is provided with circular bulge, and the bottom surface of drift just in time matches with the shallow hole terminal surface of ball valve end cover blank with the cavity that "T" die cavity of lower die encloses. The centering sleeve and the punch are additionally arranged, when the flange at one end of the ball valve end cover blank is pre-forged, the shallow hole at the side is forged simultaneously, so that the subsequent machining allowance and machining cost can be reduced, the material consumption can be reduced, and the manufacturing efficiency and the product coaxiality are improved.

Description

Special preforging die for ball valve end cover blank

Technical Field

The utility model relates to a forge mould technical field, concretely relates to forging die structure in advance of ball valve end cover blank.

Background

The ball valve end cover is used as a common part on a pressure pipeline and is widely applied to the technical fields of petroleum, chemical industry and the like. The ball valve end cover is generally formed by forging a blank and then machining. FIG. 1 shows a ball valve end cap with flanges at both ends, with a shallow hole at one end and a deep hole at the other end. The forging die comprises a preforging die and a finish forging die, the preforging is used for upsetting one end flange, the finish forging is used for upsetting the other end flange and punching, and the shallow hole is completed by subsequent machining.

The prior preforging die only comprises a lower concave die, a T-shaped cavity which is vertically communicated is arranged in the lower concave die, and the T-shaped cavity is pressed on the top surface of the lower concave die to be formed through a hammer head or an ascending block of forging equipment. Because the design of the preforging die is unreasonable, waste products are often generated due to the out-of-tolerance coaxiality error; shallow holes are not formed during forging, so that the subsequent machining allowance is large, the material consumption is large, and the machining cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a ball valve end cover blank fashioned preforging die is exclusively used in reduces follow-up machining allowance, reduces material consumption, reduces the machine and adds originally, ensures the axiality, reduces the rejection rate.

Therefore, the utility model discloses the technical scheme who adopts does: the utility model provides a special preforging die of ball valve end cover blank, includes lower die, have vertical "T" die cavity of lining up in the lower die, still include centering sleeve and the drift with the coaxial setting of lower die, the bottom of centering sleeve has the surrounding edge, and the centering sleeve is arranged in the lower die top, and passes through the top of die is covered down to the surrounding edge, the drift is vertical to be passed the centering sleeve and to stretch into the upper portion of "T" die cavity to the lateral wall of drift and the laminating of the inner wall of centering sleeve, the bottom surface of drift is provided with circular bulge, and the cavity that the bottom surface of drift and "T" die cavity of lower die enclose just in time matches with the shallow hole terminal surface of ball valve end cover blank.

Preferably, the bottom of the centering sleeve is provided with a weight-reducing clearance groove, so that the self weight is reduced, the horizontal contact area of the centering sleeve and the lower female die is reduced by more than half, and oxide skin and excess materials can be accumulated in the pre-forging process.

Further preferably, the upper end face of the punch is flush with the upper end face of the centering sleeve.

The utility model has the advantages that: circular bulges on the centering sleeve and the punch are additionally arranged, when the flange at one end of the ball valve end cover blank is pre-forged, the shallow hole at the side is forged simultaneously, so that the subsequent machining allowance and machining cost can be reduced, the material consumption can be reduced, and the manufacturing efficiency and the product coaxiality are improved.

Drawings

FIG. 1 is a schematic view of a blank for a ball valve end cap.

Fig. 2 is a schematic structural diagram of the present invention.

FIG. 3 is a process flow diagram of a ball valve end cap blank.

Detailed Description

The invention will be further described by way of examples with reference to the accompanying drawings:

as shown in figure 2, the special preforging die for the ball valve end cover blank mainly comprises a lower female die 1, a centering sleeve 2 and a punch 3.

The lower female die 1 is internally provided with a vertically through T-shaped cavity 1a, and the centering sleeve 2 and the punch 3 are coaxially arranged with the lower female die 1.

The bottom of the centering sleeve 2 is provided with a surrounding edge 2a, the centering sleeve 2 is arranged above the lower concave die 1, and the top of the lower concave die 1 is covered by the surrounding edge 2 a. The punch 3 vertically penetrates through the centering sleeve 2 and extends into the upper part of the T-shaped cavity 1a, and the side wall of the punch 3 is attached to the inner wall of the centering sleeve 2.

The bottom surface of the punch 3 is provided with a circular bulge 3a, and a cavity surrounded by the bottom surface of the punch 3 and the T-shaped cavity 1a of the lower concave die 1 is just matched with the end surface of the shallow hole of the ball valve end cover blank. And after the pre-forging is finished, the end head of the workpiece is consistent with the end face of the shallow hole of the final ball valve end cover blank.

Preferably, the bottom of the centering sleeve 2 is also provided with a weight-reducing clearance groove 2b, so that the self weight is reduced, the horizontal contact area of the centering sleeve 2 and the lower female die 1 is reduced by more than half, and oxide skin and excess materials can be accumulated in the pre-forging process. Add and subtract heavy clearance groove, have triple technological effect: firstly, the self weight of the centering sleeve is reduced, and the manufacturing cost of the centering sleeve and the downward driving force of forging equipment can be reduced; secondly, the horizontal contact area between the centering sleeve and the lower female die is reduced by more than half, and in the pre-forging process, the horizontal contact area between the centering sleeve and the lower female die is too large, so that the centering sleeve is easily damaged, the centering accuracy is influenced, and finally, the product coaxiality error is out of tolerance and waste products are generated; and thirdly, oxide skin and excess materials on the outer surface of the workpiece are extruded into the weight-reducing clearance groove along a gap between the lower female die and the punch in the pre-forging process, the horizontal contact area of the centering sleeve and the lower female die is limited to be reduced by more than half, and the main purpose is to ensure that the centering sleeve is not damaged and simultaneously have enough space for accommodating the oxide skin and the trace excess materials.

In addition, the upper end face of the punch 3 is flush with the upper end face of the centering sleeve 2. The T-shaped cavity 1a is also internally provided with a draft angle.

The working process is as follows: (1) putting the bar heated to the forging temperature into a lower concave die of a preforging die, enabling a hammer head or an upper sliding block of forging equipment to move downwards to press the workpiece to be as high as the upper plane of the lower concave die, and enabling the hammer head or the upper sliding block to return to an initial position; (2) and sleeving a centering sleeve, installing an upper punch in the center hole of the centering sleeve, enabling the hammer head or the upper slide block to move downwards to the lower end face of the centering sleeve to be in contact with the upper plane of the lower female die, and simultaneously forming a flange and a shallow hole at one end of a workpiece to finish pre-forging.

Referring to fig. 3, the ball valve end cover blank sequentially undergoes four processes of blanking, pre-forging, finish forging and punching and connecting skin.

Claims

1. The utility model provides a special preforging die of ball valve end cover blank, includes die (1) down, have vertical "T" die cavity (1a) that link up in die (1) down, its characterized in that: still include centering sleeve (2) and drift (3) with lower die (1) coaxial setting, the bottom of centering sleeve (2) has surrounding edge (2a), and centering sleeve (2) are arranged in down die (1) top, and pass through surrounding edge (2a) cover the top of die (1) down, drift (3) are vertical to be passed centering sleeve (2) and are stretched into the upper portion of "T" die cavity (1a) to the lateral wall of drift (3) is laminated with the inner wall of centering sleeve (2), the bottom surface of drift (3) is provided with circular protrusion (3a), and the cavity that the bottom surface of drift (3) and "T" die cavity (1a) of die (1) enclose just in time matches with the shallow hole terminal surface of ball valve end cover blank down.

2. A special preforging die for a ball valve end closure blank as claimed in claim 1, wherein: the bottom of the centering sleeve (2) is also provided with a weight reduction clearance groove (2b) to reduce the self weight, so that the horizontal contact area of the centering sleeve (2) and the lower concave die (1) is reduced by more than half, and oxide skin and excess materials can be accumulated in the pre-forging process.

3. A special preforging die for a ball valve end closure blank as claimed in claim 1 or claim 2, wherein: the upper end face of the punch (3) is flush with the upper end face of the centering sleeve (2).