RU2236342C2 - Press-mold for making abrasive tool - Google Patents

Abstract

FIELD: manufacture of grinding and polishing discs with vulcanite binder.

SUBSTANCE: press-mold includes upper molding plate in the form of blanking punch, ring and lower molding plate mounted in said ring with possibility of motion and having mandrel. Ring and mandrel are built-up ones. Upper part of ring being removable die for blanking annular blank along outer diameter is provided with stripper in the form of sleeves with screws. Sleeves are passed with gap through openings of lugs provided in lateral surface of blanking punch. Screws are provided with lock nuts and they have flange in upper portion.

EFFECT: more comfortable usage of press-mold, reduced number of manual operations.

2 dwg

Description

The invention relates to the abrasive industry, namely the production of grinding and polishing wheels on a volcanic bond.

A device for the production of abrasive tools, including a die cut to obtain ring blanks and a mold for sealing assembled into a package of blanks [1]. The mold contains the upper molding plate, the body in the form of a ring built into it with the ability to move the lower molding plate with a mandrel.

The disadvantage of this device is the high complexity of manufacturing the tool and low productivity. Separate cutting and manual assembly of blanks on the mandrel of the mold, along with these shortcomings is one of the reasons for the decline in product quality.

The closest in technical essence and the achieved effect to the proposed mold is a device containing an upper molding plate made in the form of a punch, a ring built into it with the ability to move the lower molding plate with a mandrel, while the ring and the mandrel are made integral, the upper part of the ring in the form of a removable die-cutting matrix of the annular workpiece by the outer diameter, and the upper part of the mandrel is in the form of a removable die-cutting insert of the inner hole of the workpiece, the inner diameter of the face exceeds the inner diameter of the removable matrix, the outer diameter of the insert exceeds the diameter of the mandrel [2].

This device provides an increase in productivity and a decrease in the laboriousness of tool manufacturing, but at the same time there remains a need for the use of heavy manual labor when operating such a device, caused by the need to remove the upper part of the ring to ensure unimpeded ejection of the pressed circle from the die. The greatest difficulties in performing this operation arise when pressing large grinding and polishing wheels with an outer diameter of 600 mm or more, when removing the upper part of the ring becomes very difficult without involving an additional worker.

Thus, the main disadvantage of the closest analogue is the inconvenience during operation and the need for heavy manual labor.

The technical task of the invention is to increase the ease of use of the mold and reduce heavy manual labor.

The problem is achieved in that in the mold containing the upper molding plate, made in the form of a punch, the ring is embedded in it with the ability to move the lower molding plate with a mandrel, while the ring and the mandrel are made integral, the upper part of the ring in the form a removable die cutting die of a billet on the outer diameter, and the upper part of the mandrel is in the form of a removable die cutting die of the inner hole of the workpiece, and the inner diameter of the ring exceeds the inner diameter of the removable die, out the insert diameter is larger than the mandrel diameter, according to the invention, the upper part of the ring is equipped with a puller made in the form of bushings with screws, while the bushings are passed with a gap through the holes in the eyes, which are provided with the side surface of the punch, the screws are equipped with locknuts, and their upper part has a flange .

The fact that the upper part of the ring is equipped with a puller made in the form of sleeves with screws, and while the sleeves are passed with a gap through the holes in the eyes, which are equipped with the side surface of the punch, the screws are equipped with locknuts, and their upper part has a flange, which allows you to automatically remove the upper part of the ring when cutting the punch up after the pressing operation is completed, eliminate manual labor in this operation and increase the ease of use of the mold.

The proposed mold is shown in figures 1, 2. In figure 1 - the mold in the initial position, in figure 2 - in the intermediate working positions (the left half of the projection at the end of pressing, the right after removing the die cutting matrix from the ring ) The mold contains an upper molding plate made in the form of a punch 1, a ring 2, a lower molding plate 3 with a mandrel 4 integrated in it with the possibility of movement, the ring 2 and the mandrel 4 form a cavity 5 and are made integral, the upper part of the ring 2 is in in the form of a removable matrix 6 of cutting the annular blanks 7 by the outer diameter, and the upper part of the mandrel 4 is in the form of a removable insert 8 of cutting the inner hole of the blanks. The inner diameter of the ring 2 exceeds the inner diameter of the removable matrix 6, and the outer diameter of the insert and exceeds the diameter of the mandrel 4. On the surface of the removable matrix 6 is a plate 9 previously rolled from the abrasive-volcanic mass. The removable matrix 6 is equipped with pullers made in the form of bushings 10 with screws 11 and a lock nut 12, the upper part of the screws has a flange 13. The threaded sleeves 10 of the pullers are placed with a gap in the holes of the eyes 14, which are provided with the side surface 15 of the punch 1. From the ring blanks 7 to the batch blank 16 of the abrasive wheel is assembled and pressed into the mold.

The mold works as follows.

Before starting work, the pullers are adjusted to the required length depending on the height of the pressed workpiece by unscrewing the adjusting screws 11 from the threaded sleeves 10 and then fixing them with lock nuts 12. Then, a plate 9 pre-rolled from the abrasive-volcanic mass is fed to the surface of the removable matrix 6, while the punch is cut the punch is in the upper position. Then turn on the press and the punch 1 is mixed down and cuts off the annular blank 7 on the outer diameter in the removable matrix 6 and the inner hole through the insert 8. The cut annular blank 7 enters the cavity 5 formed by the ring 2 and the mandrel 4, then the punch 1 is packaged on the mandrel 4 and pressed to the lower molding plate 3. Then the cycle repeats: the next part of the plate 9 is fed into the mold, from which the second ring blank 7 is cut. When the punch 1 moves down, the blank is placed on the cut previously billeted workpiece and pressed to it. The cycle is repeated until a billet blank 16 of an abrasive wheel of the required height is typed. Then the punch 1 rises, the eyes 14 located on the side surface 15 of the punch 1 abut against the flanges 13 of the screws 11 mounted in the threaded sleeves 10, and the die die 6 is removed from the ring 2, then the insert 8 is manually removed and the pressed blank 16 abrasive the circle is removed from the mold, the punch 1 is lowered down to the position corresponding to the placement of the die cutting matrix 6 on the upper end of the ring 2, and then the working cycle is repeated.

The proposed mold was tested in the manufacture of grinding wheels on a vulcanite bond with an outer diameter of 500 mm, an inner 305 mm and a height of 250 mm. The custom puller length was 350 mm. The total number of used pullers 4, pairwise located opposite each other. The maximum possible adjustment of the length of the pullers provided for a circle with a height of up to 600 mm. The mold showed its efficiency and allowed to create more favorable conditions for its maintenance by eliminating heavy manual labor when removing the upper part of the ring.

The proposed mold is advisable to use in the manufacture of large polishing and grinding abrasive wheels on a volcanic bond.

Sources of information

1. Technical instructions for the manufacture of volcanic and flexible polishing wheels. Chelyabinsk, South Ural Central Scientific Research Institute, 1970, p. 44-45.

2. RF patent No. 2107609. A method of manufacturing an abrasive tool and a device for its implementation. Publ. 03/27/98, bull. No. 9, B 24 D 18/00.

Claims (1)

A mold containing an upper forming plate made in the form of a punch, a ring integrated in it with the ability to move the lower forming plate with a mandrel, the ring and the mandrel being made integral, the upper part of the ring in the form of a removable die cutting matrix diameter, and the upper part of the mandrel is in the form of a removable insert for cutting the inner hole of the workpiece, the inner diameter of the ring exceeding the inner diameter of the removable matrix, the outer diameter of the insert exceeding the diameter of woks, characterized in that the upper part of the ring is equipped with a puller made in the form of bushings with screws, while the bushings are passed with a gap through the holes in the eyes that are provided with the side surface of the punch, the screws are equipped with locknuts, and the upper part has a flange.

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