US2862409A

US2862409A - Tool dressing means

Info

Publication number: US2862409A
Application number: US558565A
Authority: US
Inventors: Walter P Mckain
Original assignee: Fada Radio & Electric Co Inc
Current assignee: Fada Radio & Electric Co Inc
Priority date: 1956-01-11
Filing date: 1956-01-11
Publication date: 1958-12-02
Anticipated expiration: 1975-12-02

Description

Dec. 2, 1958 W.YP. MCKAIN TOOL DRESSING MEANS Filed Jan. 11, 1956 'FIG3 6 7 KW mm mm m, .m- P R ,1 E m a, W

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United States Patent TOOL DRESSING MEANS Walter P. McKain, Parkersburg, W. Va., assignor, by mesne assignments, to Fada Radio & Electric Co., Inc., Cincinnati, Ohio, a corporation of New York Application January 11, 1956, Serial No. 558,565

7 Claims. 01. 76--5) This invention relates to tool dressing means. It has to do particularly with improvements in the cooperating members which act ,on the metal of the tool in the dressing operation and with a method .of controlling the metal flow during dressing of the toolwhereby superior results are obtained. 7 p

' The general field in which this invention lies is that of copending application Serial No. 512,764, filed June 2, 1955. That application discloses a tool dressing machine comprising a two-part die comprising opposed die halves adapted to fit together to generally surround the heated cutting end of a tool to be dressed and a ooop erating dressing roller adapted to roll over the heated end of the tool which is disposed within the die to forge the metal of the tool to sharpen the tool. The tool dress ing operation involves the application of great pressure to the metal of the end of the tool while that metal is at forging temperature and it has been found that on occasions some of the metal flows out laterally (i. e., forms lateral flash) between the roller and the die. Such lateral metal flow results in improper dressing of the tool.

I provide for dressing a tool so as to obviate lateral flow of the metal of the tool between the die and the dressing roller or other dressing member cooperating with the die. My improved method comprises heating to forging temperature the end of the tool to be dressed, substantially surrounding the heated end of the tool by a die, pressing a dressing member against the heated end of the tool and moving it generally transversely to the axis of the tool to forge the metal of the heated end of the tool to dress the tool and during such forging inhibiting lateral flow of metal between the die and the dressing member and causing the metal to flow between the die and the dressing member generally in the direction of relative movement between the die and the dressing member. I provide for positively blocking lateral flow of metal between the die and the dressing member and for the maintaining of clearance between the die and the dressing member in the direction of movement of the dressing member transversely of the axis of the tool to cause the metal to flow between the die and the dressing member generally in that direction.

My improved tool dressing means comprises multipart die means adapted to generally surround the heated cutting end of a tool to be dressed and having bearing portions extending transversely thereof generally parallel to and at opposite sides of the center line of the die 'means at which the cutting edge of the tool is disposed during dressing and a dressing member adapted to be moved over the die means to dress the heated cutting end of the tool, the dressing member having bearing portions engaging the bearing portions of the die means as the dressing member moves over the die means and the dressing member having an active portion between the bearing portions thereof adapted to engage the heated cutting end of the tool to be dressed, the die means and the active portion of the dressing member being relative- 1y shaped to provide space therebetween Wh'en'the dressing member moves past an end of the cutting edge of the tool with its bearing portions against the bearing portions of the die means to permit metal of the heated cutting end of the tool to flow into the space ahead of the dressing member while the dressing member is advancing whereby to inhibit lateral flow of metal between the die means and the dressing member.

I preferably provide dressing member guiding means extending transversely of the die means and dispose the portion of the dressing member facing the die means in between and guided by the guiding means. The guiding means perform a two-fold function. They prevent lat-.

. eral displacement of the dressing member and cause the posed in the die.

dressing member to generate a cutting edge on the tool which will be a curvilinear line in the vertical plane passing through the center of the die means and longitudinally of the tool being dressed. Prior to the present invention the only means for maintaining the dressing member in the desired verticalplane during dressing of the tool was the restrainingeffect of the two cylinders and piston rods operating the dressing member. With the incidence of wear in the clevises and pins supporting the cylinders their restraining eifect was reduced. The guiding means which I provide positively insure maintenance of the dressing member in the desired vertical plane throughout the dressing operation. The guiding means in addition to guiding the dressing memberfalso inhibit or block lateral flow of metal during dressing of the tool. The guiding means cooperate with the die means and the active portion of the dressing member to cause the metal of the heated cutting end of the tool. being dressed to flow ahead of the dressing member and not laterally between the die means and the dressing member. The dressing member is preferably a dressing roller. and means are preferably provided for rolling the roller over the die means to dress theheated cutting end of the tool while exerting heavy pressure against the roller to shape the heated metal of the tool end. The die means and the active portion of thedressingj member are preferably generally complementally shaped except that the die means is recessed opposite part, of the active portion of the dressing member to provide space therebetween when the dressing member moves past an end of the cutting edge of the tool with its bearing portions against the bearing portions of the die means to permit metal of the heated cutting end of the tool to flow into the space ahead of the dressing member while the dressing member is advancing whereby to inhibit lateral, flow of metal between the die means and the dressing member. I

The die means may comprise a two-part die comprising opposeddie halves adapted to fit together to generally surround the heated cutting end. of a tool to be dressed, each die half havinga bearing portion and a guiding portion for cooperation'with a dressing member which may be in the form of a roller. The bearing portions and the guiding portions of the respective die halves desirably extend generally parallel to each other, to the parting plane of the two-part die and to the cutting edge of the tool to be sharpened when dis- The dressing member is moved along the bearing portions and guiding portions oi? the die ber facing the die being disposed in between and guided halves to dress the heated cutting end of the tool, the dressing member having bearing portions engaging the bearing portions of the die halves as the dessing member moves over the die, the portion of the dressing memby theguiding portions of'the die halves, the dressing member having an active portion adapted to engage the heated cutting end of the tool to be dressed. The die and the, active portion of the dressing member are relatively shaped to provide space therebetween as above explained when the dressing member moves past an end of the cutting edge of the tool with its bearing portions against the bearing portions of the die to permit metal of the heated cutting end of the tool to flow into the spacea'head of tli dressing roller while the dressing muer is advancing whereby to. inhibit. and indeed bloc k lateralflow of, metal between the roller and the gniding portions of the die. i

Other details, objects and advantages of the invention will become' apparent as'the following description of a present preferre'd embodiment thereof and a present preferred method of practicin'g'the same proceeds.

In the accompanying drawings I have shown a present preferred embodiment of "the invention and Have illusw trated'a present preferred method of practicing the same w i Figure 1 is a fragmentary plan view, partly in horizontal cross section, of tool dressing means;

Figure 2 is a central vertical cross-sectional view taken on the line II- -II of Figure l; and V Figure 3 is a'face view of the die shown in Figures land2. 7

Referring now more particularly to the drawings, there is shown a two-part die designated generally by reference numeral 2 which comprises opposed die halves 3 which are adaptedto fit together to generally surround the heate d cutting end of a tool to be dressed. The die'halves when fitted together provide a central opening 4 shown in Figure 3 which is of generally the same shape'as the cross section of the tool to be dressed. While the tool itself is not shown in the drawings, the die has opposed inward projections 5 adapted to enter the water courses of the tool and opposed generally rounded faces 6 adapted to embrace the correspondingly shaped faces of the tool between the water courses. Each of the die halves 3 has a projection 7 at its bottom adapted to enter a recess in the die supporting frame so that the dies may be opened and closed by turning movement generally about the projections 7 as well known to those skilled in the art. Since the mounting and operating mechanism for the dies does not constitute the present invention such mounting and operating mechanism is not shown in the drawings. It may bethe monnting and operating mechanism shown in said copending application.

The left-hand face of the die 2 viewing Figures 1 and 2 is shaped to cooperate with a dressing member shown as in the form of a dressing roller 8 to dress the cutting end of the tool, The dressing roller is of generally cylindrical shape but with a central peripheral recess 9 for shaping the cutting edge of the tool. The dressing roller 8 has at its ends coaxial trunnions 10 mounted in bearings 11 carried by generally depending arms 12 connected by a cross member 13 to which is in turn connected a generally upwardly extending piston rod 14 carrying a piston, not shown, whieh operates in a generally vertically oriented cylinder mounted aboye the roller. Operation of the piston in the cylinder moves the roller up and down viewing Figure 2.

Opposed links 15 embracing the trunnions 10 also embrace the reduced ends 16 of a cross member 17 to which is connected a piston rod 18 carrying a piston, not shown, which operates in a generally horizontally oriented cylinder. When the .piston carried by piston rod 18 is forced toward the right viewing Figures 1 and 2 it presses the dressing roller 8 toward the die 2.

The mounting and operating means for the dressing roller 8 have been shown only diagrammatically since such mounting and operating means may be convention al. Similar mounting and operating means for a dressing roller are disclosed in said copending application.

' The left-hand face of the die 2 viewing Figures l and 2 is shaped generally complementally with respect to the dressing roller 8 in horizontal cross section as manages shown in Figure 1 except that the die is recessed opposite part of the roller, the recess being designated by reference numeral 19. Laterally outside the recessed portion 19 of the die 2 each of the die halves 3 has a bearing portion 20, the bearing portions 20 extending generally parallel to each other, to the parting plane of the die and to the cutting edge of the tool to be sharpened when disposed in the die. Outside the bearing portions 20 the die has guiding portions 21 which are parallel to the bearing portions 20 and project toward the left viewing Figure 1 relatively to the operative face of the die. The guiding portions 21 are spaced apart a distance such as to guidingly receive the edge of the roll 8 therebetween as shown in Figure 1. The roll 8 has bearing portions 22 bearing against the bearing portions 20 of the die 2. In vertical cross section the die 2 has the shape shown in Figure 2 which is to impart to the cutting edge of the tool being dressed the desired conformation as known to those skilled in the art.

At the beginning of a tool dressing operation the roller 8 is retracted toward the left viewing Figures 1 and 2 away from the die 2 and the die halves 3 are turned generally outwardly about the projections 7 to open the die. The end of; a tOol heated to forging temperature is inserted into the die and the die halves are closed against each other to embrace the end of the tool as known to those skilled in the art. The end of the tool projects somewhat to the left relatively to the left hand face of the die 2 viewing Figures 1 and 2 so that when it is acted on by the roller 8 the metal projecting beyond the diewill be forged to dress the tool and form a sharp cutting edge thereon.

With the tool thus held in the die the roller 8 is pressed toward the right by admitting pressure behind the piston carried by the piston rod 18 and at the same time the piston carried by piston rod 14 is alternately moved up and down in its cylinder, the effect being to move the roll 8 up and down relatively to the die 2 and against the heated end of the tool while exerting great pressure against the heated end of the tool and against the die. As the roller 8 moves up and down its bearing portions 22 ride on the bearing portions 20 of the die halves Q and the roller is guided by the guiding portions 2 1 of the die halves, insuring proper guiding of the roller relatively to the die as above explained. The roller shapes h end of the too th m tal e n m w a la ig due to having been heated, to forging temperature before being inserted into the die. The recess 19 in the die provides clearance between the roller'and the die at the central active portion of the roller when the roller rolla past each of the upper and lower ends ofthe: cutting edge of the tool viewing Figure 1 with the bearing portions 22 of the roll against the bearing portions 2o of the die so that metal of the heated cutting end of the tool flows into the space 10 ahead of the roller while the roller is advancing to inhibit lateral flow of metal between the roller and the die which as above explained results in improper dressing of the tool. 'Also, the guiding portions 21 of the die between Which the edge of the roller fits positively block lateral flow of metal between the roller and the die.

Thus the flow of metal during dressing of a tool is controlled so that the metal flows ahead of the dressing member and is prevented from flowing laterally between the dressing member and the die whereby the undesirable results heretofore obtained are obviated.

Subject matter disclosed but not claimed herein is claimed in copending application Serial No. 622,162'jfiled November 14, 1956. J

While I have shown and described a present preferred embodiment of the invention and a present preferred method of pract cing the same it is to be distinctly unrs ocd t a th nven n is o lim t the tb m may be otherwise variously embodied within the scope of the, following claims. i

I claim: 7

1. Tool dressing means comprising multi-part die means adapted to generally surround the heated cutting end of a tool to be dressed and having bearing portions extending transversely thereof generally parallel to and at opposite sides of the center line of the die means at which the cutting edge of the tool is disposed during dressing and a dressing member adapted to be moved over the die means to dress the heated cutting end of the tool, means for moving the dressing member back and forth over the die means to dress theheated cutting end of the tool, the dressing member having bearing portions engaging the bearing portions of the die means as the dressing member moves over the die means and the dressing member having an active portion between the bearing portions thereof "adapted to engage the heated cutting end of the tool to be dressed, the die means and the active portion of the dressing member being relatively shaped to provide space therebetween when the dressing member moves past an end of the cutting edge of the tool with its bearing portions against the bearing portions of the die means to permit metal of vthe heated cutting end of the tool to flow into the space ahead of the dressing member while the dressing member is advancing whereby to inhibit lateral flow of metal between the die means and the dressing member.

2. Tool dressing means comprising multi-part die means adapted to generally surround the heated cutting end of a tool to be dressed and having dressing member guiding means extending transversely thereof generally parallel to and at opposite sides of the center line of the die means at which the cutting edge of the tool is disposed during dressing and a dressing member adapted to be moved over the die means with the portion of the dressing member facing the die means disposed in between and guided by the guiding means to dress the heated cutting end of the tool and means for moving the dressing member back and forth over the die means to dress the heated cutting end of the tool.

3. Tool dressing means comprising multi-part die means adapted to generally surround the heated cutting end of a tool to be dressed and having bearing portions extending transversely thereof generally parallel to and at opposite sides of the center line of the die means at which the cutting edge of the tool is disposed during dressing and also having dressing member guiding means outside the respective bearing portions andgenerally parallel thereto and raised above the bearing portions and a dressing member adapted to be moved over the die means to dress the heated cutting end of the tool, means for moving the dressing member back and forth overthe die means to dress the heated cutting end of the tool, the dressing member having bearing portions engaging the bearing portions of the die means as the dressing member moves over the die means and the dressing member having an active portion between the bearing portions thereof adapted to engage the heated cutting end of the tool to be dressed, the portion of the dressing member facing the die means being disposed in between and guided by the guiding means, the die means and the active por tion of the dressing member being relatively shaped to provide space therebetween when the dressingmember moves past an end of the cutting edge of the tool with its bearing portions against the bearing portions of the die means to permit metal of the heated cutting end of the tool to flow into the space ahead of the dressing member while the dressing member is advancing, the guiding means in addition to guiding the dressing member also inhibiting lateral flow of metal during dressing of the tool.

4. Tool dressing means comprising multi-part die means adapted to generally surround the heated cutting end of a tool to be dressed and having bearing portions extending transversely thereof generally parallel to and at opposite sides of the center line of the die means at 6., which the cutting edge of the tool is disposed during dressing and a dressing roller adapted to roll over the die. means to dress the heated cutting end of the tool, means for rolling the dressing roller back and forth over the die means to dress the heated cutting end of the tool, the dressing roller having bearing portions engaging the bearing portions of the die means as the dressing roller rolls over the die means and the dressing roller having an active portion between the bearing portions thereof adapted to engage the heated cutting end of the tool to be dressed, thedie-means and the active portion of the dressing roller being relatively shapedto provide space therebetween when the dressing roller rolls past an end of the cutting edge of the tool with its bearing portions against the bearing portions of the die means to permit metal of the heated cutting end of the tool to flow into the space ahead of the dressing roller while the dressing roller is advancing whereby to inhibit lateral flow of metal between the die means and the dressing roller.

5. Tool dressing means comprising multi-part die means adapted to generally surround the heated cutting end of a tool to be dressed and having bearing portions extending transversely thereof generally parallel to and at opposite sides of the center line of the die means at which the cutting edge of the tool is disposed during dress ing and a dressing member adapted to be moved over the die means to dress the heated cutting end of the tool,

means for moving the dressing member back and forth over the die means to dress the heated cutting end of the tool, the dressing member having bearing portions engaging the bearing portions of the die means as the dressing member moves over the die means and the dressing member having an active portion between the bearing portions thereof adapted to engage the heated cutting end of the tool to be dressed, the die means and the active portion of the dressing member being generally complementally shaped except that the die means is recessed opposite part of the active portion of the dressing member to provide space therebetween when the dressing member moves past an end of the cutting edge of the tool with its bearing portions against the bearing portions of the die means to permit metal of the heated cutting end of the tool to flow into the space ahead of the dressing member while the dressing member is advancing whereby to inhibit lateral flow of metal between the die means and the dressing member.

6. Tool dressing means comprising a two-part die comprising opposed die halves adapted to fit together to generally surround the heated cutting end of a tool to be dressed, each die half having a bearing portion and a guiding portion for cooperation with a dressing roller, the bearing portions and the guiding portions of the respective die halves extending generally parallel to each other, to the parting plane of the two-part die and to the cutting edge of the tool to be sharpened when disposed in the die, and a dressing roller adapted to roll along the bearing portions and guiding portions of the die halves to dress the heated cutting end of the tool, the dressing roller having bearing portions engaging the bearing portions of the die halves as the dressing roller rolls over the die, the portion of the dressing roller facing the die being disposed in between and guided by the guiding portions of the die halves, the dressing roller having an active portion adapted to engage the heated cutting end of the tool to be dressed, the die and the active portion of the dressing roller being relatively shaped to provide space therebetween when the dressing roller rolls past an end of the cutting edge of the tool with its bearing portions against the bearing portions of the die to permit metal of the heated cutting end of the tool to flow into the space ahead of the dressing roller while the dressing roller is advancing whereby to inhibit lateral flow of metal between the roller and the guiding portions of the die.

7. Tool dressing means comprising multi-part die means adapted to generally surround the heatedcutting end of a tool to be dressed and having bearing portions extending transversely thereof generally parallel to and at opposite sides of the center line of the die means at which the cutting edge of the tool is disposed during dressing and a dressing member adapted to be moved over the die means to dress the heated cutting end of the tool, means for moving the dressing member back and forth over the die means to dress the heated cutting end of the tool, the dressing member having bearing portions engaging the bearing portions of the die means as the dressing member moves over the die means and the dressing member having an active portion between the bearing portions thereof adapted to engage the heated cutting end of the tool to be dressed, the die means and the active portion of the dressing member being generally complementally shaped except that at least one of the dressing member and die means is recessed opposite part of the active portion of the other, thereof to provide space therebetvveen when the dressing member moves past an end of the cutting edge of he tool wi its bearing P0 tions against the bearing Portions of the die means to permit metal of the heated cutting end of the tool to flow into the space ahead of the dressing member while the dressing member is advancing whereby to inhibit lateral flow of metal between the die means and the dressing member.

Rsfe sgses .C ssi i t fi e of this Pa UNITED STATES PATENTS 1,767,881 Gustin June 24, 1930 2,443 814 Curtis June 22, 1948 2,615,353 Ives Oct. 28, 1952 2,771,796 1956