CA1086100A - Process and apparatus for manufacturing trimming dies - Google Patents
Process and apparatus for manufacturing trimming diesInfo
- Publication number
- CA1086100A CA1086100A CA313,488A CA313488A CA1086100A CA 1086100 A CA1086100 A CA 1086100A CA 313488 A CA313488 A CA 313488A CA 1086100 A CA1086100 A CA 1086100A
- Authority
- CA
- Canada
- Prior art keywords
- blank
- bore
- cylindrical
- punch
- ejector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/12—Forming profiles on internal or external surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K5/00—Making tools or tool parts, e.g. pliers
- B21K5/20—Making working faces of dies, either recessed or outstanding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
PROCESS AND APPARATUS
FOR MANUFACTURING TRIMMING DIES
ABSTRACT OF THE DISCLOSURE
A process and apparatus for manufacturing trimming dies having a conical polygonal aperture and for use in a nut-trimming press equipped with a cup-shaped fixture for holding the die to calibrate the width over flats of hexagonal nuts. The invention is characterized in that a blank to form a trimming die is produced with an external diameter corresponding with an internal diameter of a cup-shaped holding fixture. The blank has a height corresponding to the height of the finished die. The blank also has a cylindrical bore. A polygonal bore is made in the cylindrical bore of the blank by cold deformation of the internal diameter by means of a polygonal pressure punch inserted into the internal bore in a confined manner while retaining the external diameter size of the blank.
FOR MANUFACTURING TRIMMING DIES
ABSTRACT OF THE DISCLOSURE
A process and apparatus for manufacturing trimming dies having a conical polygonal aperture and for use in a nut-trimming press equipped with a cup-shaped fixture for holding the die to calibrate the width over flats of hexagonal nuts. The invention is characterized in that a blank to form a trimming die is produced with an external diameter corresponding with an internal diameter of a cup-shaped holding fixture. The blank has a height corresponding to the height of the finished die. The blank also has a cylindrical bore. A polygonal bore is made in the cylindrical bore of the blank by cold deformation of the internal diameter by means of a polygonal pressure punch inserted into the internal bore in a confined manner while retaining the external diameter size of the blank.
Description
36iL00 The present invention relates to a process o~
manufacturincJ a trimming die having a conical pol~gonal aperture which is used in a nut-trimming press equipped with a cup-shaped fixture for holding the die to calibrate the width over flats of hexagonal nuts.
A possibility for manufacturing trimming dies is known (from FR-PS 2 145 357). Here, a cylindrical blank with a conical axial bore is placed into a holding fixture of the press. The diameter of the lower aperture of the conical bore is either as large as, or larger than, the diameter measured at the corners of the head of a screw obtained by means of these dies. The holding fixture itself has a cylindrical bore which goes over into such a conical one whose conicity, in essence, is the same as that of the punch.
The continuation of the boring in the fixture is cylindrical ' again.
,.~
;, As soon as the blank has been placed into the cylindrical part of the holding fixture, a punch of hexagonal cross-section is introduced into the bore of the blank. The , 20 cylindrical shank of the punch is guided in a ring. This ` ring, whose diameter is not larger than that of the cylindrical boring in the holding fixture, rests upon the upper surface of the blank in the process of pressing, while the punch goes into the conical boring of the blank. In the ' process of further action of the ring and punch, the hexagonal head will be formed in the blank, under the action of the ;-;,~ :
i pressure of the press, the blank goes over into the conical ' part of the holding fixture and, resulting from the flow of ':'! the material, a conical external shape is obtained. With ,i 30 continued pressing process, the material at the lower face - plate of the blank will also flow into the cylindrical boring, ~ .
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being the continuation of the conical one, so that, at the end po~ition of the punch, the blank will also have a cylindrical shoulder on one of its face plates besides its external conical form.
After the punch and the ring have been removed, the blank can be taken out by turning over the holding fixture.
However, before a die, produced according to the known method, could be used to produce nuts, a further operation, e.g., grinding or turning, is inevitably necessary to remove the cylindrical shoulder on one o the face plates of the blank and to turn the cone for obtaining a suitable die with the xequired dimensions and with a cylindrical external diameter.
This additional work is inevitable since the corresponding ixture for holding the die in a nut-press is cylindrical.
The scope and aim of the present invention consists of eliminating the above drawbacks in the production of trim-ming dies used for producing screws with a polygonal head, and of producing the dies with the required dimensions without any substantial additional work.
In accordance with the invention, this problem is solved in such a manner that the blank for making the trimming die is produced with an external diameter corresponding with the internal diameter of the cup-shaped holding fixture, and ; having a height corresponding to the finish size. The blank has a cylindrical internal bore and the polygonal bore is made by cold deformation of the diameter of the internal bore by . :. . .
i means of a polygonal pressure punch inserted into the internal - bore in a confined manner whilst retaining the size of the external diameter of the blank. With the application of this m~thod, thê appaxatus can manufacture the trimming die without any additional machining, except for the removal of small burrs :":
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8~i~0() ~ormed on the lower face plate when the punch comes out of the boring, since the die has exactly the preset external cylinder diameter, and also the tolerances for the height and len~th could be preset exactly. In this process, a compacting of the material takes place, which quite considerably increases the lifetime of the trimming die, as a result of widening the bore of the blank. Simultaneously ~he blank is -Eixed in the holding ixture, between the punch and the guiding sleeve and between the spacer ring and kicker rod, fo.rming the bottom of the holding fixture. In addition, the fo~med die is kicked out under the action of the kicking rod without any manual operation. According to a bxoad aspect, the present invention provides a process for manufacturing trimming dies with a conical polygonal aperture and for use in a nut-trimming press equipped with a cup-shaped fixture for holding the die to calibrate the width over flats of hexagonal ~, nuts, characterized in that a blank to form a trimming die is produced with an external diameter corresponding with an internal diameter of a cup-shaped holding fixture, said blank ~' 20 having a height corresponding to the height of the finished die and haviny a cylindrical bore, a polygonal bore is made in said bore of said blank by cold deformation of the internal :.
diameter by means of a polygonal pressure punch inserted into . the internal bore in a confined manner while retaining the - external diameter size of the blank. According to a broad aspect, the present invention provides an apparatus for . manufacturing trimming dies characterized by a holding fixture ~ for holding a blank, a spacer ring supported under the blank ; in a bore in said fixture and supported by a bottom of said holding fixture, a guide sleeve for retaining a polygonal pressure punch whose length exceeds that of said guide sleeve : .
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:~ - 3 whereby a polygonal internal bore is produced in an internal bore of said blank when the pressure punch is driven into the internal bore of the blank, said guide sleeve abutting a top free face of said blank, at a lower end, and aligning itself at an upper end with a top face of said punch when the punch is fully driven into the blank, said holding fixture ha~ing a kicker sleeve with a relatively movable kicker rod at the bottom thereof.
According to a further broad aspect of the present invention there is provided a method for producing a cylindri-cal trimming die having a conical many-sided internal bore extending therethrough, for use in a screw trimming press having a cup-shaped cylindrical holder of a given inner diameter within which the trimming die is receivable. The .~ ., method includes the steps of preparing by machining a cylindrical blank having an external diameter corresponding . . .
; to the inner diameter of the cup-shaped cylindrical holder and an inner bore extending therethrough. The inner bore is cylindrical for at least the majority of the length thereof, ~ 20 and the height and external diameter of the blank corresponds to the desired finished height and diameter thereof. The prepared cylindrical blank is then placed into a cylindrical bore provided in a holder mounted on a press. The cylindrical ; bore has an internal diameter substantially the same as the external diameter of the blank. The sidewall of the cylindri-cal bore engages and confines the cylindrical blank over the full height thereof. A many-sided punch is then introduced into the inner bore of the cylindrical blank and the--punch.-: ~
pressed into the inner bore to a predetermined, limited extent -? 30 while the blank is held stationary by the holder, to produce within the blank a many-sided internal bore by cold deforma--tion, while preserving the initial, finished external diameter of the blank. ~ -- '.' ~6~
According to a further broad aspect of the present invention there is provided an apparatus for producing a cylindrical trimming d-ie having a conical many-sided internal bore extending therethrough, for use in a screw trimming press having a cup-shaped cylindrical holder of a given inner diameter within which the trimming die is receivable. The trimming die is made from a cylindrical blank having an external diameter and a height corresponding to the desired finished external diameter and height of the trimming die, and provided with an inner bore extending therethrough. The apparatus includes press means, including a bed, and a movable press portion operable to be moved toward and away from the bed. Holder means is mounted on the bed and provided with a cylindrical bore opening toward the movable v,~
press portion and having an internal diameter substantially the same as the external diameter of the blank. The blank ~-~ is receivable within the cylindrical bore and the sidewall , , .
'-~ of the cylindrical bore is of sufficient height for engaging and confining the cylindrical blank over the full height ., '~ 20 thereof when the blank is placed therewithin. A many-sided punch is also provided, the lower end of which is receivable within the upper end of the inner bore within a blank received within the cylindrical bore of the holder. The upper end of the punch is engageable by the movable préss portion for pressing the punch into the blank to form a many-sided internal bore therewithin by cold deformation, while the initial finished external diameter of the blank is preserved.
The holder means is arranged to hold the blank stationary ' during pressing of the punch thereinto.
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~3610~) As an example for the embodiment, the Figures illustrate an apparatus for realizing the process in the invention. ~ere:
Figure 1 is the vertical cross-section with the various parts required for carrying out -the process, Figure 2 is a vertical cross-section with the various parts in the starting position' ; Figure 3 is a vertical cross~section similar to ;
Figure 2 showing the press punch in the end~position, Figure 4 is a formed pressed trimming die. -It may be seen in Figure 1, the starting material ~1 for the trimming die to be produced is a blank 1 made as a cylindrical ring with a short conical bore 2 and cylindrical ~-`~ bore 2a. The diameter of cylindrical bore 2a is smaller than ~`
the size of a screw-head to be obtained with the trimming die.
In order to form the die with a polygonal bore, a blank 1 is --placed into a holding fixture 3 and gets into`end contact ~,~
' 20 a spacer ring 4, arranged under the blank. The ring 4 is supported by bottom face 5 of the holding fixture 3. The ;
holding fixture is attached to the press by means of screws 6 .. , :
,~ and is equipped with kicker sleeve 7 having a kicker rod 8 ,,.," ~'';
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'.!, :~ - 4b -which forms the bottom 5 and which intrudes into the bore of ,~ the holding fixtur~. Conical press-punch 9, having hexagonal , sections 9a, intrudes into the bore of blank 1. The short ~, conical bore 2 in blank 1 serves to guide the punch 9. The - cylindrical shaft of press punch 9 works together with sleeve 10, which guides the press punch 9. The length of the polygo-nal press punch 9 exceeds that of the guide sleeve 10 in such a manner that a polygonal internal bore is obtained when the press punch has been driven into internal borings 2, 2a ~i 10 of blank 1 until its free face end 9b aligns itself with the 'a upper annular surface lOa of the guide sleeve 10.
It is, of course, within the ambit of the invention that the intrusion depth of the press-punch into the int:ernal bore of the blank could be regulated by means of restricting the stroke of the press.
, .
In Figure 2, spacer ring 4, blank 1, and a portion of ;. ~, ;,~ guide sleeve 10 are in the bore of the holding fixture 3, and !'```',~'~ the tip 9c of press punch 9, is guided by the short conical .s,~ , boring 2 of blank 1, as it enters into the bore 2a. In this position, during the following stroke, the press-punch covers a distance until face plate 9a of press-punch 9 and face plate lOa of guide sleeve 10 will be in the same plane 11 (Figure 3) ~: and the final size of the internal bore of the blank, i.e., . .
, the ringl has been obtained. The diameter of the bore in the . . .
holding fixture 3 is the same as that of the spacer ring 4, , - of the blank 1, of the kicking sleeve 7, and of the guide ; sleeve 10, so that the preset external diameter of the blank, :, ' i.e., of the trim ring remains exact during the Pressing ~` process.
:;., `~ 30 Figure 3 illustrates the end position of the press-punch 3. An axial pressure acting vertically upon the head of -:.
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the punch (or, in the case of restricting the stroke of the press, an axial pressure acting simultaneously upon press-punch 9 and guide sleeve 10) drives press-punch 9 through bores 2, 2a, -thereby obtaining a widening of the internal bore of the blank 1, and a compacting of the material, and of the polygonal surface. The generated radial forces acting uniformly around the punch during the material compacting process have no disadvantageous effect.
After the pressing process has been completed, the press is retracted, i.e., their pressing plates are moved away from each other and press-punch 9 and guiding sleeve 10 are in the free position. Subsequently, a kicking punch 12 provided in the press is actuated. This punch 12 goes into a blind hole 14, ]ocated on the lower supporting surface 13 of the kicking sleeve 7, and presses kic]cing rod 8 against press-punch 9. This willloose the fit between the conical, polygonally formed part 9a of press-punch 9 and the ring .
already pressed. Under further actuation o~ kicking rod 12, ;- Xicking sleeve 7 will be pressed against spacer ring 4, i.e., ~ -~' 20 and consequently against the cornpletely pressed blank. The , stroke of kicking sleeve 7 and that of the kicking rod 8 above '~ the depth of blind hole 14 are confined by shoulder 15 of ' ~ kicking sleeve 7. As soon as the shoulder 15 gets in contact :., ' with the holding fixture 3, the kicking process has been ''~ completed. It is kicking sleeve 7 with kicking rod 8 and .,~........................................................................ .
'i spacer ring 4 overlaying it that are in the bore of the holding '-- fixture 3.
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Figure 4 illustrates the kicked out ring produced in this manner. It may readily be seen that, except for some easy deburring of the lower face plate of the internal bore, that no further machining is required, and that the ring may ;.~
~ be use~ immediately.
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manufacturincJ a trimming die having a conical pol~gonal aperture which is used in a nut-trimming press equipped with a cup-shaped fixture for holding the die to calibrate the width over flats of hexagonal nuts.
A possibility for manufacturing trimming dies is known (from FR-PS 2 145 357). Here, a cylindrical blank with a conical axial bore is placed into a holding fixture of the press. The diameter of the lower aperture of the conical bore is either as large as, or larger than, the diameter measured at the corners of the head of a screw obtained by means of these dies. The holding fixture itself has a cylindrical bore which goes over into such a conical one whose conicity, in essence, is the same as that of the punch.
The continuation of the boring in the fixture is cylindrical ' again.
,.~
;, As soon as the blank has been placed into the cylindrical part of the holding fixture, a punch of hexagonal cross-section is introduced into the bore of the blank. The , 20 cylindrical shank of the punch is guided in a ring. This ` ring, whose diameter is not larger than that of the cylindrical boring in the holding fixture, rests upon the upper surface of the blank in the process of pressing, while the punch goes into the conical boring of the blank. In the ' process of further action of the ring and punch, the hexagonal head will be formed in the blank, under the action of the ;-;,~ :
i pressure of the press, the blank goes over into the conical ' part of the holding fixture and, resulting from the flow of ':'! the material, a conical external shape is obtained. With ,i 30 continued pressing process, the material at the lower face - plate of the blank will also flow into the cylindrical boring, ~ .
: . .
being the continuation of the conical one, so that, at the end po~ition of the punch, the blank will also have a cylindrical shoulder on one of its face plates besides its external conical form.
After the punch and the ring have been removed, the blank can be taken out by turning over the holding fixture.
However, before a die, produced according to the known method, could be used to produce nuts, a further operation, e.g., grinding or turning, is inevitably necessary to remove the cylindrical shoulder on one o the face plates of the blank and to turn the cone for obtaining a suitable die with the xequired dimensions and with a cylindrical external diameter.
This additional work is inevitable since the corresponding ixture for holding the die in a nut-press is cylindrical.
The scope and aim of the present invention consists of eliminating the above drawbacks in the production of trim-ming dies used for producing screws with a polygonal head, and of producing the dies with the required dimensions without any substantial additional work.
In accordance with the invention, this problem is solved in such a manner that the blank for making the trimming die is produced with an external diameter corresponding with the internal diameter of the cup-shaped holding fixture, and ; having a height corresponding to the finish size. The blank has a cylindrical internal bore and the polygonal bore is made by cold deformation of the diameter of the internal bore by . :. . .
i means of a polygonal pressure punch inserted into the internal - bore in a confined manner whilst retaining the size of the external diameter of the blank. With the application of this m~thod, thê appaxatus can manufacture the trimming die without any additional machining, except for the removal of small burrs :":
.
- :. . . . :~ .
8~i~0() ~ormed on the lower face plate when the punch comes out of the boring, since the die has exactly the preset external cylinder diameter, and also the tolerances for the height and len~th could be preset exactly. In this process, a compacting of the material takes place, which quite considerably increases the lifetime of the trimming die, as a result of widening the bore of the blank. Simultaneously ~he blank is -Eixed in the holding ixture, between the punch and the guiding sleeve and between the spacer ring and kicker rod, fo.rming the bottom of the holding fixture. In addition, the fo~med die is kicked out under the action of the kicking rod without any manual operation. According to a bxoad aspect, the present invention provides a process for manufacturing trimming dies with a conical polygonal aperture and for use in a nut-trimming press equipped with a cup-shaped fixture for holding the die to calibrate the width over flats of hexagonal ~, nuts, characterized in that a blank to form a trimming die is produced with an external diameter corresponding with an internal diameter of a cup-shaped holding fixture, said blank ~' 20 having a height corresponding to the height of the finished die and haviny a cylindrical bore, a polygonal bore is made in said bore of said blank by cold deformation of the internal :.
diameter by means of a polygonal pressure punch inserted into . the internal bore in a confined manner while retaining the - external diameter size of the blank. According to a broad aspect, the present invention provides an apparatus for . manufacturing trimming dies characterized by a holding fixture ~ for holding a blank, a spacer ring supported under the blank ; in a bore in said fixture and supported by a bottom of said holding fixture, a guide sleeve for retaining a polygonal pressure punch whose length exceeds that of said guide sleeve : .
..~.
.
:~ - 3 whereby a polygonal internal bore is produced in an internal bore of said blank when the pressure punch is driven into the internal bore of the blank, said guide sleeve abutting a top free face of said blank, at a lower end, and aligning itself at an upper end with a top face of said punch when the punch is fully driven into the blank, said holding fixture ha~ing a kicker sleeve with a relatively movable kicker rod at the bottom thereof.
According to a further broad aspect of the present invention there is provided a method for producing a cylindri-cal trimming die having a conical many-sided internal bore extending therethrough, for use in a screw trimming press having a cup-shaped cylindrical holder of a given inner diameter within which the trimming die is receivable. The .~ ., method includes the steps of preparing by machining a cylindrical blank having an external diameter corresponding . . .
; to the inner diameter of the cup-shaped cylindrical holder and an inner bore extending therethrough. The inner bore is cylindrical for at least the majority of the length thereof, ~ 20 and the height and external diameter of the blank corresponds to the desired finished height and diameter thereof. The prepared cylindrical blank is then placed into a cylindrical bore provided in a holder mounted on a press. The cylindrical ; bore has an internal diameter substantially the same as the external diameter of the blank. The sidewall of the cylindri-cal bore engages and confines the cylindrical blank over the full height thereof. A many-sided punch is then introduced into the inner bore of the cylindrical blank and the--punch.-: ~
pressed into the inner bore to a predetermined, limited extent -? 30 while the blank is held stationary by the holder, to produce within the blank a many-sided internal bore by cold deforma--tion, while preserving the initial, finished external diameter of the blank. ~ -- '.' ~6~
According to a further broad aspect of the present invention there is provided an apparatus for producing a cylindrical trimming d-ie having a conical many-sided internal bore extending therethrough, for use in a screw trimming press having a cup-shaped cylindrical holder of a given inner diameter within which the trimming die is receivable. The trimming die is made from a cylindrical blank having an external diameter and a height corresponding to the desired finished external diameter and height of the trimming die, and provided with an inner bore extending therethrough. The apparatus includes press means, including a bed, and a movable press portion operable to be moved toward and away from the bed. Holder means is mounted on the bed and provided with a cylindrical bore opening toward the movable v,~
press portion and having an internal diameter substantially the same as the external diameter of the blank. The blank ~-~ is receivable within the cylindrical bore and the sidewall , , .
'-~ of the cylindrical bore is of sufficient height for engaging and confining the cylindrical blank over the full height ., '~ 20 thereof when the blank is placed therewithin. A many-sided punch is also provided, the lower end of which is receivable within the upper end of the inner bore within a blank received within the cylindrical bore of the holder. The upper end of the punch is engageable by the movable préss portion for pressing the punch into the blank to form a many-sided internal bore therewithin by cold deformation, while the initial finished external diameter of the blank is preserved.
The holder means is arranged to hold the blank stationary ' during pressing of the punch thereinto.
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~3610~) As an example for the embodiment, the Figures illustrate an apparatus for realizing the process in the invention. ~ere:
Figure 1 is the vertical cross-section with the various parts required for carrying out -the process, Figure 2 is a vertical cross-section with the various parts in the starting position' ; Figure 3 is a vertical cross~section similar to ;
Figure 2 showing the press punch in the end~position, Figure 4 is a formed pressed trimming die. -It may be seen in Figure 1, the starting material ~1 for the trimming die to be produced is a blank 1 made as a cylindrical ring with a short conical bore 2 and cylindrical ~-`~ bore 2a. The diameter of cylindrical bore 2a is smaller than ~`
the size of a screw-head to be obtained with the trimming die.
In order to form the die with a polygonal bore, a blank 1 is --placed into a holding fixture 3 and gets into`end contact ~,~
' 20 a spacer ring 4, arranged under the blank. The ring 4 is supported by bottom face 5 of the holding fixture 3. The ;
holding fixture is attached to the press by means of screws 6 .. , :
,~ and is equipped with kicker sleeve 7 having a kicker rod 8 ,,.," ~'';
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'.!, :~ - 4b -which forms the bottom 5 and which intrudes into the bore of ,~ the holding fixtur~. Conical press-punch 9, having hexagonal , sections 9a, intrudes into the bore of blank 1. The short ~, conical bore 2 in blank 1 serves to guide the punch 9. The - cylindrical shaft of press punch 9 works together with sleeve 10, which guides the press punch 9. The length of the polygo-nal press punch 9 exceeds that of the guide sleeve 10 in such a manner that a polygonal internal bore is obtained when the press punch has been driven into internal borings 2, 2a ~i 10 of blank 1 until its free face end 9b aligns itself with the 'a upper annular surface lOa of the guide sleeve 10.
It is, of course, within the ambit of the invention that the intrusion depth of the press-punch into the int:ernal bore of the blank could be regulated by means of restricting the stroke of the press.
, .
In Figure 2, spacer ring 4, blank 1, and a portion of ;. ~, ;,~ guide sleeve 10 are in the bore of the holding fixture 3, and !'```',~'~ the tip 9c of press punch 9, is guided by the short conical .s,~ , boring 2 of blank 1, as it enters into the bore 2a. In this position, during the following stroke, the press-punch covers a distance until face plate 9a of press-punch 9 and face plate lOa of guide sleeve 10 will be in the same plane 11 (Figure 3) ~: and the final size of the internal bore of the blank, i.e., . .
, the ringl has been obtained. The diameter of the bore in the . . .
holding fixture 3 is the same as that of the spacer ring 4, , - of the blank 1, of the kicking sleeve 7, and of the guide ; sleeve 10, so that the preset external diameter of the blank, :, ' i.e., of the trim ring remains exact during the Pressing ~` process.
:;., `~ 30 Figure 3 illustrates the end position of the press-punch 3. An axial pressure acting vertically upon the head of -:.
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the punch (or, in the case of restricting the stroke of the press, an axial pressure acting simultaneously upon press-punch 9 and guide sleeve 10) drives press-punch 9 through bores 2, 2a, -thereby obtaining a widening of the internal bore of the blank 1, and a compacting of the material, and of the polygonal surface. The generated radial forces acting uniformly around the punch during the material compacting process have no disadvantageous effect.
After the pressing process has been completed, the press is retracted, i.e., their pressing plates are moved away from each other and press-punch 9 and guiding sleeve 10 are in the free position. Subsequently, a kicking punch 12 provided in the press is actuated. This punch 12 goes into a blind hole 14, ]ocated on the lower supporting surface 13 of the kicking sleeve 7, and presses kic]cing rod 8 against press-punch 9. This willloose the fit between the conical, polygonally formed part 9a of press-punch 9 and the ring .
already pressed. Under further actuation o~ kicking rod 12, ;- Xicking sleeve 7 will be pressed against spacer ring 4, i.e., ~ -~' 20 and consequently against the cornpletely pressed blank. The , stroke of kicking sleeve 7 and that of the kicking rod 8 above '~ the depth of blind hole 14 are confined by shoulder 15 of ' ~ kicking sleeve 7. As soon as the shoulder 15 gets in contact :., ' with the holding fixture 3, the kicking process has been ''~ completed. It is kicking sleeve 7 with kicking rod 8 and .,~........................................................................ .
'i spacer ring 4 overlaying it that are in the bore of the holding '-- fixture 3.
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Figure 4 illustrates the kicked out ring produced in this manner. It may readily be seen that, except for some easy deburring of the lower face plate of the internal bore, that no further machining is required, and that the ring may ;.~
~ be use~ immediately.
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Claims (9)
1. The method for producing a cylindrical trimming die having a conical many-sided internal bore extending there-through, for use in a screw trimming press having a cup-shaped cylindrical holder of a given inner diameter within which said trimming die is receivable, said method including the steps of:
preparing by machining a cylindrical blank having an external diameter corresponding to the inner diameter of said cup-shaped cylindrical holder and an inner bore extend-ing therethrough, said inner bore being cylindrical for at least the majority of the length thereof, and the height and external diameter of said blank corresponding to the desired finished height and diameter thereof;
placing said prepared cylindrical blank into a cylindrical bore provided in a holder mounted on a press, said cylindrical bore having an internal diameter substan-tially the same as the external diameter of said blank, and the sidewall of said cylindrical bore engaging and confining said cylindrical blank over the full height thereof; and introducing a many-sided punch into said inner bore of said cylindrical blank and pressing said punch into said inner bore to a predetermined, limited extent while said blank is held stationary by said holder, to produce within said blank a many-sided internal bore by cold deforma-tion, while preserving the initial, finished external diameter of said blank.
preparing by machining a cylindrical blank having an external diameter corresponding to the inner diameter of said cup-shaped cylindrical holder and an inner bore extend-ing therethrough, said inner bore being cylindrical for at least the majority of the length thereof, and the height and external diameter of said blank corresponding to the desired finished height and diameter thereof;
placing said prepared cylindrical blank into a cylindrical bore provided in a holder mounted on a press, said cylindrical bore having an internal diameter substan-tially the same as the external diameter of said blank, and the sidewall of said cylindrical bore engaging and confining said cylindrical blank over the full height thereof; and introducing a many-sided punch into said inner bore of said cylindrical blank and pressing said punch into said inner bore to a predetermined, limited extent while said blank is held stationary by said holder, to produce within said blank a many-sided internal bore by cold deforma-tion, while preserving the initial, finished external diameter of said blank.
2. The method as recited in claim 1, including the further steps of:
withdrawing said many-sided punch from said cylindrical blank, after formation of said many-sided internal bore; and removing the completed trimming die from said cylindrical bore by moving an ejector means through said cylindrical bore in a direction toward said punch.
withdrawing said many-sided punch from said cylindrical blank, after formation of said many-sided internal bore; and removing the completed trimming die from said cylindrical bore by moving an ejector means through said cylindrical bore in a direction toward said punch.
3. The method as recited in claim 1, wherein the extent of pressing said many-sided punch into said inner bore is limited by placing a cylindrical guide sleeve about said punch, said guide sleeve being disposed between said cylindrical blank and a movable portion of said press which is arranged to engage said punch, the length of said punch exceeding the height of said guide sleeve by an amount corresponding to a desired predetermined insertion depth of the punch into said blank.
4. Apparatus for producing a cylindrical trimming die having a conical many-sided internal bore extending therethrough, for use in a screw trimming press having a cup-shaped cylindrical holder of a given inner diameter within which said trimming die is receivable, said trimming die being made from a cylindrical blank having an external diameter and a height corresponding to the desired finished external diameter and height of said trimming die, and provided with an inner bore extending therethrough, and said apparatus including:
press means, including a bed, and a movable press portion operable to be moved toward and away from said bed;
holder means mounted on said bed, and provided with a cylindrical bore opening toward said movable press portion and having an internal diameter substantially the same as the external diameter of said blank, said blank being receivable within said cylindrical bore, and the sidewall of said cylindrical bore being of sufficient height for engaging and confining said cylindrical blank over the full height thereof when said blank is placed therewithin; and a many-sided punch, the lower end of said punch being receivable within the upper end of the inner bore within a blank received within said cylindrical bore of said holder, and the upper end of said punch being engage-able by said movable press portion for pressing said punch into said blank to form a many-sided internal bore therewithin by cold deformation, while the initial finished external diameter of said blank is preserved, said holder means being arranged to hold said blank stationary during pressing of said punch thereinto.
press means, including a bed, and a movable press portion operable to be moved toward and away from said bed;
holder means mounted on said bed, and provided with a cylindrical bore opening toward said movable press portion and having an internal diameter substantially the same as the external diameter of said blank, said blank being receivable within said cylindrical bore, and the sidewall of said cylindrical bore being of sufficient height for engaging and confining said cylindrical blank over the full height thereof when said blank is placed therewithin; and a many-sided punch, the lower end of said punch being receivable within the upper end of the inner bore within a blank received within said cylindrical bore of said holder, and the upper end of said punch being engage-able by said movable press portion for pressing said punch into said blank to form a many-sided internal bore therewithin by cold deformation, while the initial finished external diameter of said blank is preserved, said holder means being arranged to hold said blank stationary during pressing of said punch thereinto.
5. Apparatus as recited in claim 4, including additionally:
a guide sleeve having an external diameter less than the diameter of said cylindrical bore within said holder means, and having a central bore extending there-through of a diameter greater than the diameter of said punch;
said punch being mounted to extend through said central bore of said guide sleeve, and the lower end of said guide sleeve being receivable within said cylindrical bore of said holder means and adapted to engage and rest upon the upper end of a blank received within said cylin-drical bore; and the length of said punch exceeding the height of said guide sleeve by an amount corresponding to a desired, predetermined insertion depth of said punch into said blank, the insertion of said punch into said blank being stopped when the opposite ends of said guide sleeve are engaged by said movable press part and said blank, respectively.
a guide sleeve having an external diameter less than the diameter of said cylindrical bore within said holder means, and having a central bore extending there-through of a diameter greater than the diameter of said punch;
said punch being mounted to extend through said central bore of said guide sleeve, and the lower end of said guide sleeve being receivable within said cylindrical bore of said holder means and adapted to engage and rest upon the upper end of a blank received within said cylin-drical bore; and the length of said punch exceeding the height of said guide sleeve by an amount corresponding to a desired, predetermined insertion depth of said punch into said blank, the insertion of said punch into said blank being stopped when the opposite ends of said guide sleeve are engaged by said movable press part and said blank, respectively.
6. Apparatus as recited in claim 4, including additionally:
a spacer ring receivable within said cylindrical bore of said holder means, said spacer ring having a central bore therethrough, and being adapted to support said blank thereon; and an ejector bushing received within the lower end of said cylindrical bore of said holder means, and adapted to support said spacer ring, said bushing being movable upwardly within said holder means to eject a finished cylindrical trimming die therefrom.
a spacer ring receivable within said cylindrical bore of said holder means, said spacer ring having a central bore therethrough, and being adapted to support said blank thereon; and an ejector bushing received within the lower end of said cylindrical bore of said holder means, and adapted to support said spacer ring, said bushing being movable upwardly within said holder means to eject a finished cylindrical trimming die therefrom.
7. Apparatus as recited in claim 6, including additionally:
shoulder means on said ejector bushing, engage-able with said holder means to limit the movement of said ejector bushing into said holder means.
shoulder means on said ejector bushing, engage-able with said holder means to limit the movement of said ejector bushing into said holder means.
8. Apparatus as recited in claim 7, wherein said ejector bushing has a central bore therethrough, and includ-ing additionally:
an ejector mandrel slidably received within said central bore of said ejector bushing, and movable therewithin;
said ejector mandrel having a diameter less than the diameter of said central bore of said spacer ring.
an ejector mandrel slidably received within said central bore of said ejector bushing, and movable therewithin;
said ejector mandrel having a diameter less than the diameter of said central bore of said spacer ring.
9. Apparatus as recited in claim 8, including additionally:
an ejector punch positioned below said ejector bushing and said ejector mandrel, and movable theretoward;
the lower end of said ejector bushing having a blind socket therein, of a diameter larger than the diameter of said ejector mandrel; and the upper end of said ejector punch being received within said blind socket, said ejector punch being operable to move said ejector mandrel and said ejector bushing, and the depth of said blind socket serving to limit the movement of said ejector mandrel relative to said ejector bushing.
an ejector punch positioned below said ejector bushing and said ejector mandrel, and movable theretoward;
the lower end of said ejector bushing having a blind socket therein, of a diameter larger than the diameter of said ejector mandrel; and the upper end of said ejector punch being received within said blind socket, said ejector punch being operable to move said ejector mandrel and said ejector bushing, and the depth of said blind socket serving to limit the movement of said ejector mandrel relative to said ejector bushing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772746465 DE2746465A1 (en) | 1977-10-15 | 1977-10-15 | Screw deburring die making machine - has ram to press blank bore into polygon section while outside dia. is kept constant to calibrate screw heads |
| DEP2746465.9 | 1977-10-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1086100A true CA1086100A (en) | 1980-09-23 |
Family
ID=6021529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA313,488A Expired CA1086100A (en) | 1977-10-15 | 1978-10-16 | Process and apparatus for manufacturing trimming dies |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1086100A (en) |
| DE (1) | DE2746465A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109175189A (en) * | 2018-10-30 | 2019-01-11 | 嘉善坤利精密金属模具有限公司 | A kind of molding machine of the shaving die of regular polygon hexagonal screw head |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111468661B (en) * | 2020-05-18 | 2022-02-08 | 海盐建浩金属股份有限公司 | Nut mould |
-
1977
- 1977-10-15 DE DE19772746465 patent/DE2746465A1/en not_active Withdrawn
-
1978
- 1978-10-16 CA CA313,488A patent/CA1086100A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109175189A (en) * | 2018-10-30 | 2019-01-11 | 嘉善坤利精密金属模具有限公司 | A kind of molding machine of the shaving die of regular polygon hexagonal screw head |
| CN109175189B (en) * | 2018-10-30 | 2023-12-22 | 嘉善坤利精密金属模具有限公司 | Forming device of trimming die of regular polygon hexagonal screw head |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2746465A1 (en) | 1979-04-19 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |