RU2181318C2 - Press-mold for making sleeve of powder material - Google Patents

Abstract

FIELD: powder metallurgy, namely press-molds for pressing articles such as sleeves of powder materials. SUBSTANCE: press-mold includes holder, elastic die, elastic separating sleeve and elastic insert, upper punch, lower punch and base. Upper punch is builtup one; it has outer and inner cylindrical lids mounted with possibility of axial motion one relative to another. In cavity of inner lid there are elastic compensating member and cylinder that may perform axial motion. Outer lid is provided with fixing member. Invention allows to make thin-wall dead-bottom round and non-round articles of different powder materials in condition of automated production process. EFFECT: enhanced quality of products. 1 dwg

Description

 The invention relates to powder metallurgy, in particular to molds for pressing parts such as a glass of powder materials.

 A known mold for pressing products such as a crucible containing a container, an elastic matrix, an upper punch with an elastic insert and a lower punch [1].

 This mold does not provide sufficient uniformity, since the mold does not provide for different strokes of the punches pressing the bottom and the wall, and the compressibility of the elastic element forming the bottom is insufficient to compensate for this. The second drawback of the mold is the probability of separation of the bottom during unloading. When the slider moves up, the elastic element of the punch forming the bottom ceases to contact the bottom of the product at the same time that the elastic matrix forming the walls is still compressed, and with the further advance of the slider, it can tear off the bottom. In addition, the mold does not have a separation sleeve, which entails the movement of the powder in the axial direction, which can lead to separation of the bottom or cracking in the mating zone of the side wall and the bottom.

 The closest in technical essence and the achieved result to the proposed one is a mold for pressing parts of the crucible type, containing a holder with an elastic matrix placed therein with a dividing sleeve and an elastic insert, a base, upper and lower punches used in the method of pressing products [2] .

 This mold also does not provide the simultaneous beginning and end of the action of the forming elements on the bottom and the crucible walls at the beginning of loading and unloading, which similarly can lead to separation of the bottom or cracking in the interface between the side wall and the bottom, i.e. receiving the product is not of good quality.

 The objective of the invention is to improve the quality of the glass.

 This task is achieved by the fact that in the mold for pressing glasses of powder containing a holder, an elastic matrix, an elastic separation sleeve and an insert, a lower punch, a base and a composite upper punch, comprising an outer and an inner cylindrical cover, compensating the elastic element , cylinder and retainer, due to the composite upper punch having the possibility of various movements of the inner and outer cylindrical covers, provided by the introduction of an elastic compensating element nt, it turns out the simultaneous compaction of the side wall and the bottom to the same density.

 The drawing shows the design of the mold.

 The mold contains a holder 1 mounted on the base 2, a lower punch 3 pressed into this base, an elastic matrix 4, an elastic dividing sleeve 5, an elastic liner 6 and a composite upper punch consisting of an outer cylindrical cover 7, an inner cylindrical cover 8, a cylinder 9, an elastic compensating element 10 and a latch 11.

 The mold works as follows. The powder mass 12 is poured into the gap between the lower punch 3 and the separation sleeve 5, which also covers the lower punch 3. The powder is covered from above with an elastic insert 6 inserted inside the separation sleeve 5. A composite upper punch is held on the elastic insert, held in assembled form by the latch 11 .

 Then, pressing is carried out, in which the press force is transmitted to the side walls of the glass through the outer cylindrical cover 7, the elastic matrix 4 and the separation sleeve 5. At the bottom of the glass, the press force is transmitted through the outer cylindrical cover 7, cylinder 9, an elastic compensating element 10, the inner cylindrical cover 8 and elastic liner 6.

 After removing the load from the mold, the base 2 with the lower punch 3 is removed, from which the finished product 13 is removed.

 In this mold, the effects of the forming elements on the side wall and the bottom of the glass begin at the beginning of loading and end when unloading at the same time, which prevents possible destruction or cracking in the mating zone of the side wall and the bottom and allows the selection of the sizes of the elastic compensating element to achieve simultaneous compaction of the side wall and bottom to the same density.

 Using the proposed mold, exact-shaped glasses were made from copper, iron and ceramic powders, while the magnitude of the different density did not exceed 0.5%. The study of the structure of the product through the manufacture of microsections showed an almost uniform structure in the zones of the side wall, bottom and their interface. As a result, high-quality products were obtained.

 The use of the invention will allow to obtain high thin-walled deaf-flowing products, both round and non-circular, from various powder materials under conditions of automated production with high quality products.

 Sources of information.

 1. A.S. 1052334, B 22 F 3/03, 11/07/1982.

 2. A.S. 1726126, B 22 F 3/03, 04/15/1982.

Claims (1)

 A mold for pressing powder cups containing a ferrule, an elastic matrix, an elastic separation sleeve and an insert, an upper punch, a lower punch and a base, characterized in that the upper punch is made integral in the form of an outer and inner cylindrical lid mounted with axial movement relative to each other, and in the cavity of the inner cover is placed an elastic compensating element and a cylinder having the possibility of axial movement, and the outer cover is provided with a latch.