US1838518A

US1838518A - Knockdown mold

Info

Publication number: US1838518A
Application number: US168896A
Authority: US
Inventors: Anderson Edward
Original assignee: Simonds Worden White Co
Current assignee: Simonds Worden White Co
Priority date: 1927-02-17
Filing date: 1927-02-17
Publication date: 1931-12-29
Anticipated expiration: 1948-12-29

Description

E. ANDERSON Dec. 29, 1931.

IFIII u Patented Dec. 29, 1931 UNITED STATES PATENT, OFFICE EDWARD ANDERSON, on DAYTON, orrro, ASSIGNOR, BY. MESNE ASSIGNMENTS, 'ro

SIMONDS W'ORDEN WHITE COMPANY, A CORPORATION OFQHIO KNocKpown MOLD Application filed February 17, 1927. Serial No; 168,896;

This invention relates to molds forva} rious purposes, but more particularly to molds in which to form grinding wheels by pressure, and it is concerned with means'for knocking down the mold for the purpose of releasing the molded wheel. 7

As the objects and advantages of this invention will be more easily seen and appreciated after its construction has been de- 10 scribed, I shall proceed to describe it, refer-- ring to the accompanying drawings, in which,

Fig.1 is a View looking down ,on a mold constructed according to my plan, and

Fig. 2 is a vertical section of the mold, taken on line 22 of Fig. 1. In this View themold is standing upon what is understood to be the bed of a powerful press, while the ram of the press is bearingdown on the plunger which constitutes the top of the mold.

Fig. 3 is substantiallythe'same View as Fig. 2, save that the segments 2020 have been removed from below the jacket 19 and placed on the upper edge of the jacket, for a purpose to be described presently. l

The molding chamber comprises the bottom plate 10, for forming one side of the wheel, the body 11, which forms the periphery of the wheel, and the top 12, that forms the side of the wheel opposite that formed by the plate 10. Preferably, the plate 10 is adapted to lie on the bed 13 of a press. As presses for this purpose are common in the art. the bed 13 and ram 14 are merely shown symbolically, and are respresentative of the press so far as it is necessary.

As is clearly shown in Fig. is formed with a plurality of segments, in the present case four in number. These are numbered respectively 15, 16, 17 and 18. There is no special merit in making the segment 18 smaller than the others, except as a matter of convenience and economy in constructing the body 11. As shown in the present case the interior of the body is cylindrical in form. The exterior is tapered toward the plate 10. In making the body, a solid ring is formed having the desired cross section. The ring is so then cut into segments. As cutting the ring 1, the body 11.

results in some'waste it becomes necessary to make up for the waste, and this is done by cutting a small segment, such as 18, froma second ring. I As an alternative to this method the original ring may be cut to within a small distance of the inner wall, say within one-eighth of an inch thereof, which uncut portion can then be easily broken. 'Thus the segmentsare formed without any loss in the interior of the body, it being only necessary in reassembling the segments to put the fractured edges in contact with their respective mates.

For the purpose of holding the segments in place in bodily form, I provide a jacket 19, which is merely a ring, tapered on the inside to conform to the taper of the body 11.

This jacket restson segments 202Q, whereby it is supported at an altitude necessary to properly confine the segments of'the body 11. In order to avoid close fitting of the parts I form a rabbet on the edge of the plate 10, in which the lower edge'of the body rests. It is immaterial, therefore, if because of the segments 2020 being a little too thick, the body is held up a little from the bottom of the rabbet in the plate 10. 1

The plunger 12 extends above the body 11 enough to enable theram 14 of the press to bear on its upper end and compress the material 21 of which the wheel is formed. Preferably, the angularity of the taper on the body 11 is such that as soon as the segments 2020 are removed from under it the jacket will drop'to the bed of the press, thereby releasing thesemnents forming the body 11. But should the jacket adhere after the supporting segments, 20-20 are withdrawn, the segments may be laid on the upper edge of the jacket,-as in Fig. 3,and the ram then usedto. press the jacket free from the body. Obviously, very little pressure will be needed for. this.

If desired a mandrel 22 set in the plate 10 may be used to form a'hole in the wheel, the plunger '12 being then provided with the necessary bore.

' While my mold may be used for various purposes, and while when it is used for molding abrasive wheels various mixtures maybe employed, prepared and compacted in various ways, my mold is especially applicable to molding wheels by what is known as the dry press method. In this method the abrasive material, the clay and other materials which are used to bind the abrasive together, are mixed in a dry state, and then slightly moistened, preferably with water. This mass is put into the mold and pressed as above described. Afterward the wheels may be fired in the usual way.

It is not to be understood that the scope of my invention is limited to the details of construction shown, as variations therein are possible without departing from the spirit of the invention. For example, it is not necessary to taper the outside of the body. Instead, a comparatively small area of the outside of each segment, preferably near its middle, may be made sufficiently prominent to engage the tapered inner wall of the j acket. This is so simple and easily understood that illustration is unnecessary. Other modifications may also be made while remaining within the scope of my claims, which are as follows:

1. A mold for grinding wheels, comprising a bottom plate adapted to form one side of a wheel, a ring resting on said plate, whereby to form the periphery of a wheel, said ring being formed of segments and tapered toward said plate, a acket surrounding the ring and tapered interiorily in conformity to the exterior of the ring, and supporting blocks for the jacket adapted to lie on a plane surface on which said bottom plate lies and support the jacket at an altitude enabling the jacket to hold the segments in the form of a ring, said blocks being removable when it is desired'to let the jacket down to release the segments.

2. A mold for grinding wheels, comprising a bottom plate adapted to form one side of a wheel, a in lying on said plate, whereby to form the periphery of the wheel, said plate having a rabbet formed at its periphery in which the ring stands and whereby it is centered on the plate, the ring being tapered downward on the outside and composed of a plurality of segments; a jacket tapered on the inside to conform to the aforesaid taper, whereby the segments are held in position, and a pair of segments to lie on a plane surface on which said plate lies, and afford arest .for the jacket, supporting the acket at an altitude necessary for holding the ring together, said segments being removable to let the jacket drop down and release the segments;

3. Apparatus for molding grinding wheels,

comprising a press with a bed and a movable ram; a mold comprising a plate adapted to form one side of a wheel, said plate lying upon said bed, a ring whereby to form the periphery of the wheel, said ring being formed with segments, a jacket surrounding and holding the segments in bodily form, the interior thereof being tapered, so when it is moved downward with reference to the ring the segments are released, removable segments interposed between said jacket and bed, thereby supporting the jacket in position enabling it to retain the ring in bodily form, and a plunger to stand on the material in the mold and form the side of the wheel opposite that formed by said plate, said plunger extending above the ring so it can be forced down by the ram.

4-. Apparatus for molding grinding wheels, comprising a press with a bed and a movable ram; a mold comprising a plate adapted to form one side of a wheel, said plate lying upon said bed, a ring whereby to form the periphery of the wheel, said ring being formed with segments, a jacket surrounding and holding the segments in bodily form, the interior thereof being tapered, so when it is moved downward with reference to the ring the segments are released, removable segments interposed between said acket and bed, thereby supporting the j ackct in position enabling it to retain the ring in bodily form, and a plunger to stand on the material in the mold and form the side of the wheel opposite that formed by said plate, said plunger extending above the ring so it can be forced down by the ram, said supporting'segments being adapted to be laid on the upper edge of the acket after being removed from below the jacket, so the ram can impinge on said segments and press the jacket down should it adhere thereto after the operation of pressing the wheel is finished.

5. The method of molding a mass of material into a grinding wheel, which method comprises putting said material into a mold whereby every desired dimension except one at once imparted to the mass, compacting the mass therein, thereby giving it the excepted dimension, then removing the portion of the mold which confines one side of the wheel and removing in sections the portion of the mold which forms the perimeter of the wheel.

EDTVARD ANDERSON.