RU2107609C1 - Method and device for manufacture of abrasive tools - Google Patents

Abstract

FIELD: abrasive industry; manufacture of polishing and grinding wheels on vulcanite binder. SUBSTANCE: method includes rolling of abrasive mass into plates, cutting circular blanks from plates, stacking the blanks on mandrel of lower moulding plate and packing the stack by subsequent pressing each cut blank to previous one; stacking and pressing are effected by one stroke of punch. Device for realization of this method contains upper moulding plate, ring with lower moulding plate movably built in it. Lower moulding plate is provided with mandrel. Upper moulding plate is made in form of cutting punch. Ring and mandrel are sectional in construction. Upper part of ring is made in form of detachable die for cutting circular blank over outer diameter; upper part of mandrel is made in form of detachable insert for cutting the inner hole in blank. Inner diameter of ring exceeds inner diameter of detachable die and outer diameter of upper insert of mandrel exceeds diameter of mandrel. EFFECT: enhanced efficiency. 3 cl, 3 dwg

Description

 The invention relates to the abrasive industry, namely to the production of preforms of predominantly large-sized polishing and grinding wheels on a volcanic ligament of high height.

 A known method of manufacturing blanks of abrasive tools on a volcanic bond, including rolling (leafing) of abrasive mass on sheets with a height of 6-13 mm, duplicating them by calendaring to a height of 13-25 mm and cutting blanks of abrasive wheels [1].

 A significant disadvantage of this method are the low technological capabilities. Forming by calendering allows you to get flexible polishing wheels of a limited height: from 13 to 25 mm.

 A device for the production of abrasive tools, made in the form of a calender with two rolls [1].

 A disadvantage of the known device, as well as the above method, are limited technological capabilities. The device allows you to form only two plates in the package. A package of three plates is already stratified by calendering due to inhomogeneous deformation of the package in height.

 The closest in technical essence and the achieved result to the proposed method is a method of manufacturing an abrasive tool, including rolling the abrasive mass on plates with a height of 6-13 mm, cutting them out of the annular blanks of abrasive wheels, packing them on the table of the cutting press, transferring the package to the assembly site of the blanks to the mandrel of the lower molding plate of the mold, assembling the package on the mandrel of the lower molding plate, transferring the package assembled on the mandrel to the pressing section, loading the package into the pres c-shape and subsequent compression of the bag by pressing [2]. In this way, polishing and grinding wheels with a diameter of 200 to 600 mm and a height of 32 to 275 mm are obtained.

 The main disadvantages of the method are the high complexity and high power of the press equipment. So, with a pressing force of 500 kN, polishing wheels with a maximum diameter of 250 mm and a maximum height of 50 mm can be obtained. With a pressing force of 6300 kN, polishing wheels with a maximum diameter of 500 mm and a maximum height of 75 mm can be obtained. To seal workpieces with a large diameter (more than 600 mm) and a large height (more than 275 mm), hydraulic presses with a force of 10,000 - 20,000 kN are required. Moreover, to improve the quality of the workpieces and eliminate delamination defects, the method of pressing in the mold should be bilateral.

 The high complexity of the method is due to the execution of cutting and baling operations in the cutting section, and compaction operations in the pressing section, as well as manual labor-intensive transport operations between the sections.

 The closest in technical essence and the achieved effect to the proposed one is a device for the production of abrasive tools, including a die cut for receiving ring blanks and a mold for sealing the blanks assembled in a package [3]. 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 increased complexity of manufacturing the tool and low productivity. Separate cutting, manual assembly of blanks on the mandrel of the mold and further pressing require significant labor costs, reduce productivity, and also degrade the quality of products.

 The objective of the invention is to reduce the complexity of manufacturing a tool, increasing productivity.

 The problem is achieved in that in the known method for the production of abrasive tools, including rolling the abrasive mass into plates, cutting from the plates of annular blanks, assembling the blanks into a bag on the mandrel of the lower molding plate and sealing the bag, according to the invention, compact the bag by pressing each successive cut blank in turn to the previous one, while the workpiece is cut down, packaged on the mandrel and pressed in one stroke of the punch.

 The task in the proposed device is achieved by the fact that the known device containing a means of cutting annular blanks and a mold comprising an upper molding plate, a ring integrated with it to move the lower molding plate with a mandrel according to the invention, the upper molding plate is made in the form of the punch, and the ring and the mandrel are made integral, while the upper part of the ring is in the form of a removable matrix for cutting the annular workpiece according to the outer diameter, and the upper part of the mandrel is made in de removable insert felling of the inner hole of the workpiece, and the inner diameter of the ring exceeds the inner diameter of the removable matrix, and the outer diameter of the insert exceeds the diameter of the mandrel.

 In the proposed method, as a result of cutting a workpiece, packing it on a mandrel and pressing it in one stroke of a punch, operations disappear: warehousing of ring workpieces on an accumulation table, transportation of package assemblies to a table, package assembly (after cutting the workpieces automatically overlap each other), transportation package on the press for sealing, assembly of the mold and sealing. This significantly reduces the complexity of manufacturing the tool, increases the productivity of the method.

 The possibility of combining cutting, baling and pressing operations in one mold equipped with a cutting punch and a die, along with a decrease in labor input and an increase in productivity, reduces the number of technological equipment units, reduces the metal consumption of the device, and saves floor space.

 The proposed method and device is illustrated in FIG. 1-3, where in FIG. 1 shows a diagram of the implementation of the method after cutting the workpiece at the time of packaging; in FIG. 2 is a diagram at the time of prepress; in FIG. 3 is a general view of the device.

 The proposed method is as follows.

 The abrasive mass is rolled onto plates. Then annular blanks are cut from the plates. For each previous workpiece, the subsequent workpiece is pressed. Cutting, assembly into a bag and prepressing are carried out in one stroke of the punch.

 The device for the production of abrasive tools consists of a body in the form of a ring 1, in which the lower molding plate 2 with the mandrel 3 is mounted with the possibility of movement. The upper molding plate is made in the form of a punch 4. The ring 1 and the mandrel 3 are made integral. The upper part of the ring 1 is made in the form of a removable matrix 5 for cutting the annular workpiece by the outer diameter, the upper part of the mandrel - in the form of an insert 6 is used to cut the inner hole of the workpiece. The inner diameter of the ring 1 exceeds the inner diameter of the removable matrix 5, and the outer diameter of the insert 6 exceeds the diameter of the mandrel 3.

 Pre-rolled from the abrasive mass, the plate 7 is fed to the inventive device, while the punch 4 takes the extreme upper position. Then they turn on the press and the punch 4 moves downward, cutting the annular workpiece 8 according to the outer diameter in the removable matrix 5 and the inner hole by means of insert 6. The cut-out annular workpiece 8 enters the cavity 9 formed by the ring 1 and the mandrel 3, then the punch 4 is packaged on the mandrel 3 and is pressed to the lower molding plate 2. Then the cycle repeats: the next part of the plate 7 is fed into the device, from which the second ring blank 8 is cut. When the punch 4 moves down the blank It is pressed onto a previously cut blank and is pressed to it. The cycle repeats until a packet 10 of a given height is picked up. After that, insert 6 is removed from the mandrel 3 and the removable matrix 5 is removed from the ring 1.

 According to the proposed technical solution, a device was designed and manufactured for the production of grinding wheels on a vulcanite bond with an outer diameter of 500 mm, an inner diameter of 305 mm and a height of 250 mm. Productivity in the operations of cutting, assembly and pressing of the bag when compared with the prototype increased by almost 3.4 times, and the need for labor was reduced by 50%.

 The proposed method and device is most suitable for use in the manufacture of large polishing and grinding abrasive wheels on a volcanic bond.

 Sources of information taken into consideration.

 1. Technical instructions for the manufacture of vulcanite and flexible polishing wheels. Chelyabinsk, South Ural Central Scientific Research Institute, 1970, p. 44-48, clause 13, clause 18c, section VII, clause 1.

 2. Ibid., P. 44-48 and section VIII, p. 1 and 2 on pp. 51-52.

 3. In the same place, with. 44-45.

Claims (2)

 1. A method of manufacturing an abrasive tool, including rolling the abrasive mass into plates, cutting the ring blanks from the plates, assembling the blanks into a bag on the mandrel of the lower molding plate, and sealing the bag, characterized in that the bag is compacted by prepressing each successively cut down workpiece to the previous one, while the workpiece is cut down, packaged on a mandrel and pressed in one stroke of the punch.  2. A device for the production of abrasive tools, including a means of cutting annular blanks and a mold containing the upper molding plate, a ring built into it with the ability to move the lower molding plate with a mandrel, characterized in that the upper molding plate is made in the form of a cutting punch, and the ring and the mandrel are made integral, while the upper part of the ring is in the form of a removable die-cutting matrix for the annular outer diameter, and the upper part of the mandrel is in the form of a removable inner die-cutting insert holes of the workpiece, and the inner diameter of the ring exceeds the inner diameter of the removable matrix, the outer diameter of the insert exceeds the diameter of the mandrel.

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