JPS594596B2 - A tightening die assembly for tightening a sleeve onto a hose and a tightening device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for reducing the diametrical or similar dimension of a cylindrical or similarly shaped part, and in particular the forming tool comprises a collapsible collet. This invention relates to improvements in forming equipment.

A common use of devices applying the present invention is to attach tubular fitting assemblies to hoses or tubes.

Common practice in manufacturing medium and high pressure hose assemblies is to hold the hose tightly between the external sleeve of the fitting and the mounting nibble located inside the hose. The sleeve is plastically deformed or contracted around the hose end, thereby permanently securing the metal fitting or connector to the hose. The present invention relates to an apparatus that is particularly suitable for relatively low volume production such as on-site molding of replacement hoses. This invention was invented in 1969.
It is suitable for use in machines of the general type disclosed in US patent application Ser.

This type of machine has a fixed base plate and a ram that moves back and forth toward and away from the base plate. A die ring or socket and a segmented collet disposed in the tapered bore of the ring are axially compressed between the base plate and the ram. The segments or jaws of the collet then move radially inside to tighten the collet hole around the fitting sleeve and permanently crimp the sleeve to the hose end. The amount of radial expansion and contraction used in diameter reduction (tightening) collets is often less than that required to allow free axial passage through certain configurations of fittings.

Therefore, the collet assembly can be divided into, for example, separable parts.
It has been proposed to form a pair of semi-circular parts and to place the hose end assembly within these parts. A problem often encountered when using conventional split collets is positioning and maintaining the collet jaws so that the arc angles of the collet jaws are aligned to prevent the sleeve from deforming asymmetrically or otherwise inappropriately. It is necessary to do so. In some devices, when the collet segments are brought into the expanded position, the collet segments may assume or move to radially non-opposed positions. This misalignment of the collet segments often results in the production of defective parts that must be discarded. The present invention provides for resilient spacer means to be located radially across the hose ends to separate the collets along at least one radial line and to provide a uniform diameter reduction between the expanded position and the retracted position. To provide a collet diameter reduction device that maintains the desired angular relationship between each collet segment to ensure.

According to the invention, resilient spacer means temporarily hold the fitting sleeve through the collet jaws when the fitting sleeve is manually positioned within the collet and until the ram is activated to contract this sleeve. Preferably, the device is designed to be gripped in a fixed manner. In a preferred embodiment, the collet assembly comprises a plurality of rigid joints and an elastic material interposed between the joints such that in a free or expanded state, the joints have a diameter greater than the diameter of the sleeve prior to contraction. They are arranged so as to usually form a slightly smaller enclosure.

With this construction, when the collet is in the extended position, the interference between the jaws and the sleeve ensures that the individual jaws are angularly aligned while the sleeve is temporarily gripped by the collet. Retained. Ideally, the diameter reduction device would be such that the collet is deflected toward the sleeve gripping position to automatically hold the fitting in the proper axial position without the need for external manual movement or adjustment. There is. Referring to the drawings, FIGS. 1-3 illustrate a collect reducer 10 similar in structure and operation to that disclosed in the aforementioned U.S. patent application Ser. No. 798,972. The collet diameter reducing machine 10 has a frame base plate 11, an upper frame and housing 12, and a set of columns 13. Ram 16 is the frame
- A fluid cylinder/piston device (not shown) in housing 12 is driven by VC to move toward or away from base plate 11. The column or tie rod 13 is attached to the upper frame against the base plate 11 against the compressive force created by the ram 16.
・Using 12 is supported under tension. 1-3 show a diameter reduction machine 1 having a typical diameter reduction die assembly 18.
0 operation method is shown.

Die assembly 18 includes a die ring or block 19 and a cooperating collet assembly 20. Ideally, the die ring is a one-piece, rigid annular member with a tapered hole 21 in the center. Collection 20 is Dairing 19
It has a circular array of rigid segments or joints 23 having a tapered outer surface that conforms to the surface of the tapered bore 21 of the. Several collet assembly embodiments for use with diameter reducer 10 are discussed in detail below. The die ring 19 is first positioned against a pair of front stops or protrusions 26 that are screwed or otherwise fixed to the base plate 11, thereby causing the die ring 19 and the collet 20 to intersect. The upper part is not obstructed by the frame 1 and housing 12.

A second tube including a length of hose 27 and a clamping fitting 28
The hose end assembly as shown in FIGS.
It passes through the groove 29 and the tapered hole 21 and is positioned within the collet 20. The hose 27 may be positioned on the fitting 28VC before or after the fitting is positioned on the collet 201tC. After properly positioning the hose end assembly within the collet 20 on the die ring 19 and positioning the flat circular pressure ring 31 over the collet 20 in a manner described in detail below, the die ring 19 is The member such as the die ring is pushed rearward until it collides with a pair of rear stopper pins 35 fixed to the base plate 11. In this position, members such as the die ring assume a horizontal position as shown in FIGS. 2 and 3, and the collet 20 and the die ring 19 are aligned in the axial direction below the ram 16. The fitting 28 shown by way of example in FIGS. 2 and 3 has a bent tube elbow portion 33 extending radially from its body portion.

A groove 34 extends upward in the axial direction from the lower end 36 of the ram 16 so that the elbow 33 of the fixture 28 does not come into contact with the ram 16 when the collet 20 and die ring 19 are below the ram 16. The ram 16 is driven downward VCl by the cylinder-piston actuator in the housing 12 into abutment against the pressure ring 31. The pressure ring 31 uniformly applies the load of the ram 16 to each collet jaw 23.
In particular, it is evenly distributed to the joint directly below the groove 34 of the ram.
As the ram 16 gradually descends toward the base plate 11, the collet 20 moves axially within the tapered hole 21 from the position shown in FIG.
The position shown in FIG. 3 is reached in which the base plate 11 VC abuts via 9 .

The tapered or conical shape of the die ring bore 21 causes the jaw 23 to move radially inwardly as the jaw 23 is forced axially downwardly through the bore. This radial movement of the jaws 23 causes the fitting 28 to be permanently compressed or contracted diametrically inward and attached to the hose 27. 4-7 illustrate a first embodiment of collet assembly 20 in detail.

Preferably, the plurality of rigid jaws 23 are made of, for example, hard steel and have the same configuration. Resilient elastomeric spacer means 43 in the form of short cylindrical elastomeric rubber or rubber-like members are interposed between adjacent joints 23. Each elastic spacer means 43 is bonded to the selected spacer material and the radiating surface 45 of the body to which it is bonded using any known heating, hot bonding, gluing or molding method. Both adjacent joints 23V
C is fixed. As shown in FIG. 4, the collet assembly 20 is preferably formed as a pair of generally semi-circular separable segments 44. Each joint 23 has the shape of a solid conical sector.

Therefore, all of these joints 23 are machined from one common circular material. Ideally, an axially extending circular cylindrical hole is machined into this material.
This hole ultimately forms the inner curved surface 46 of the jaw 23. The outer surface of the blank is machined to form a straight tapered conical surface, for example fifteen, which ultimately forms the outer conical surface 47 of the joint 23. The axial ends of the stock are machined perpendicular to the axis of the stock so that the ends 48, 49 of the joint 23 are perpendicular to the axis of the collet 20.

After drilling a hole in a circular stock, tapering the outside surface, and finishing the ends, the stock is cut by sawing or otherwise machining along equally spaced radial lines. Make into a fan shape. Next, material on the radially outer portion of each radial cut surface 45 of the sector thus formed is removed to form a step inside the cut surface 45 to define an air space for accommodating the elastic spacer 43. . This stepped radial cut surface maximizes the arc width of the inwardly curved surface 46 and the inwardly protruding portion 51.
form. The protrusions 51 abut against each other when the collet is retracted to its final position, thereby forming the spacer member 4.
3 from being excessively deformed. Spacer 4
A resilient spacer 43a substantially identical to Collet Segment 3 is fixed to the radial surface 45 of the joint 23 at one end of each collector segment 44.

The elastic spacers 43, 43a are such that when the collet segments 44 are joined to each other and are in a substantially free state, that is, the spacers are in an uncontracted state, the inner surface 46 of each joint 23 has a reduced diameter of the outer sleeve 56 of the fixture 28. Each joint 23 is sized to form a circle slightly smaller than the previous nominal outer diameter. The diametrical interference between each joint 23 and the fixture 28 is, for example, 1.27 to 2.54 rfr! Ft(0
．． 005 to 0.010 inch). Figures 2 and 5
The figure shows the collet assembly 20 in a first or open position;
In this position, the elastic spacers 43, 43a are attached to the die ring 1.
Each jaw 23 is supported in an axial position within the sleeve 9, with an inwardly curved surface 46 of each jaw 23 providing a slight tightening against the sleeve 56. Preferably, the collet assembly 20 and die ring 19 have their axes aligned with each other in FIGS. 1, 2, and 3.
As shown in the figure, they are arranged to extend substantially vertically.

Therefore, the gravitational force acting on the collet assembly 20 causes the collet assembly 20 to move towards the VC. in the die ring 19. As a result, each end spacer 43a is deflected toward a position where it contacts the radial radial surface 45 of the opposing joint of the other collector segment 44. When the collet assembly 20 is supported perpendicularly to the tapered hole 21 of the die block 19, the assembly 20
allows only vertical upward movement of fixture 28. Mounting tool 2
Upon slight downward vertical movement of 8, the camming action of the die ring's tapered hole 21 firmly grips the fixture sleeve 56 of the collet 20 and locks into its outer surface to limit downward vertical movement of the fixture. A typical method for positioning the fitting 28 and hose 27 so that they are aligned in the axial direction of the collet assembly 20 is to slide the fitting 28 and hose 27 into the tapered hole 21 from the underside of the die block 19. It starts with. At least one of the collet segments 44 is then moved radially inward on the upper surface of the die block 19 to position the hose end within the recess formed by the plurality of joints 23 of the segment. Next, insert the collector segment (single or plural) 44 into the tapered hole 21. If the fixture 28 is located at a too low position within the collet assembly 20, the collector segment 44 should be temporarily seated in the hole 19. Then, once the fixture is in place, it can be pushed upward by hand.On the other hand, if the fixture 28 is located too high in the collet assembly 20, at least one of the collet segments 44 can be pushed upward by hand. After releasing the self-locking action of the collet 20 by pushing slightly upward within the
can be pressed down by hand. Mounting tool 28 is collect 2
When properly aligned at zero, ram 16 is biased to hold fixture 28 in position. 3, 6 and 7 show the collet assembly 20 in the fully retracted position within the dial ring 19.

In this position, the outer sleeve 56 of the fitting 28 is permanently tightened and deformed radially in an axial region slightly longer than the length of the collet assembly 20. As the sleeve 56 contracts and deforms radially, the portion of the hose 27 enclosed by the sleeve is pressed against the inner nibble portion 59 of the fitting 28, creating a permanent assembly of these portions. form. Preferably, the radius of curvature of the inner surfaces 46 of the jaws 23 is selected such that in the approximately fully tightened position shown in FIG. 6, the inner surfaces 46 form a common cylinder.

The radial or radial surface 45 of the jaw 23 has a radius sufficient to allow the elastic spacer members 43, 43a to expand radially without being constrained when the collet is retracted as shown in FIGS. 6 and 7. It has a length in the direction of application. Before the ram 16 is activated and drives the collet, the jaws temporarily grip the fixture 28 and the elastic spacer members 43, 43a.
It is understood that the collet jaws 23 are maintained uniformly spaced in an angular relationship with each other. Additionally, the resilient spacing means 43, 43a maintain this desired angular relationship during axial movement of the collet 20 within the die ring 19. In this way, the fitting sleeve 56 is tightened evenly and symmetrically. The compressive strength accumulated in the spacers 43, 43a VC assists in the upward return movement of the collet assembly 20 as it returns upward from this tightened position. Figures 8 and 9
Referring to the figures, there is shown an alternative embodiment of a collet assembly 64 having a configuration similar to collet assembly 20 shown in FIGS. 1-7.

Collet assembly 64 preferably comprises a pair of halves 65, each half having a plurality of rigid joints 66 and resilient spacer means 67, which spacers are connected to adjacent joints. It consists of a cylindrical rubber or elastomer material interposed between two. The radial outer surface 68 of the joint 66
is conical and the radially inner surface 69 is preferably cylindrical. A radial surface 71 of each joint 66 is provided with an axially extending recess 72 for receiving a portion of the cylindrical spacer member 67.

The recess 72 is formed by drilling an axial hole in the circular stock itself before cutting it into separate joints.
Each elastic spacer 67 is fixed to both adjacent joints 66 by being bonded to the surface of each recess 72 by a suitable heating method, hot bonding method, bonding method, or molding method.
The elastic spacer 67a is joined to a corresponding recess corresponding to the recess 72a of the joint 66. Collet assembly 64 is used with die ring 19 in substantially the same orientation as collet assembly 20 of the first embodiment.

Elastic end spacer 6 substantially identical to intervening spacer 67
7a cooperates with the recessed portion 72a of the opposing collet segment 65 to align both of the collet segments with each other to facilitate entry of these collet segments into the tapered hole 21 of the die ring 19. The elastic spacers 67, 67a are arranged above the hole 21 of the die ring 19 in the same manner as the above-mentioned collet assembly 20, and are arranged at positions where the inner surface 69 of the jaw 66 slightly interferes with the fitting sleeve 56 in the diametrical direction. 66, thereby facilitating proper positioning of the fitting 28 in the hole 21VC of the die ring 19. 10-12 illustrate another embodiment of a collet assembly 76 for use with collet reducer 10.

The construction of the collet reduction assembly 76 is similar to the collet assemblies 20, 64 described above, and the method of use in the collet reduction apparatus is substantially the same as described above. Collet assembly 76
It is preferable that the halving body 77 also include a pair of half-split bodies 77 each having a substantially semicircular shape.

Each segment 77 is comprised of a plurality of rigid jaw segments 78, ideally of the same shape. As shown, each jaw segment 78 has a main body that is substantially identical to the jaw of the collet assembly 20 originally described. More specifically, the jaws 78 each include a straight tapered outer circumferential surface 79, an inner circumferential surface 81, a radial surface 82, and a flat end surface 83. Each jog 78 includes an arcuate skirt portion 85 at an end 84 opposite to the end surface 83 and integrally extending in the axial direction. The skirt portion 85 is located on the same radius from the axis of the collet 76 and extends over the entire arcuate width of the jaw 78. Each skirt portion 85 has a radially extending hole 87 formed therein by drilling or other means. Resilient elastomeric spacer means 91 are provided around the skirt portions 85 of adjacent jaws 78 to hold the jaws together.

The elastic spacer means 91 of both collet halves 77 are formed approximately semi-cylindrical in the region surrounding the skirt portion 85 and have fingers 92 extending integrally in the axial direction between adjacent jaws 78 . Preferably, the elastic means 91, 92 are formed by molding. For example, the resilient spacer means 91, 92 may consist of a polyurethane elastomer that is cured into position on the jaw 78. A suitable primer is applied to the surface of the jacket 78 to improve the adhesion of the polyurethane to the jacket. Furthermore, the material of the elastic spacer means 91 is the same as that of the skirt portion 851fC. It extends through a provided radial hole 87 to mechanically retain the plurality of jaws. Molded elastic fingers 92a are provided on the separation surface of the collet division body 77 and extend integrally in the axial direction and have a width approximately half of the width of the fingers 92.
When both halves are assembled into the hole 21 of the die ring, the halves are maintained aligned at the appropriate angles.

The resilient spacer means 91, 92, 92a ensure that the inner surface 81 of each jaw 78 forms a circle slightly smaller than the outer diameter of the mounting sleeve 56 when the collector body 76 is in the die ring 19 and the ram 16 is about to operate. Maintain each collet jaw 78 at such a spacing. Collet assembly 96
Still other embodiments are shown in FIGS. 13-15.

The general shape of the joint 97 constituting the collet assembly 96 is substantially the same as that of the collet assemblies 20, 64, and 76 described above. Each joint 97 is made of a portion of a conical material with a constant slope, cut in a plane perpendicular to the axis of the material, and provided with a cylindrical hole on the axis. Therefore, each joint 97 has an outer circumferential tapered surface 98, an inner circumferential cylindrical surface 99, and a pair of radial surfaces 101,1.
02. Opposing radiation surface 1 of adjacent beam 97
An elastic spacer means 103 in the form of a cylindrical elastic pad is held between 01 and 102 by a stepped screw 104. Each stepped screw 104 is screwed into the hole 1061tc provided on the surface 1011fC of the joint 97 until the stepped portion 107 abuts against the radiation surface 101. The head 108 of the stepped screw 104 cooperates with a radial stepped surface 109 provided in the hole 111 of the pad 103 to move the pad into the lateral surface 101.
It is mechanically fixed or held so that it matches the VC.
Spacer pad 103 is aligned such that when collet assembly 96 is positioned in hole 21 of die ring 19, the inner surface 99 of the first joint forms a circle with a diameter slightly smaller than the outside diameter of the unreduced surface of fixture sleeve 56. 97 is positioned. Preferably, each joint 97 is attached to a conventional semicircular spring member 114 to form a semicircular collector segment 115.

Each spring member 114 includes an axially extending, radially displaceable spring finger 116. The free end of each finger 116 is secured by screws 117 or other fastening to an axially extending skirt (not shown) of the respective jaw 97, similar to the skirt 85 of collet jaw 78 shown in FIG. fixed by means. One spacer 103 is provided for each joint, so that two spacers 103 are provided diametrically opposite each other on the separation plane between the opposing collet divisions 115.

FIG. 14 shows the final contraction of the jaws when the jaws 97 are pushed axially into the tapered hole 21 of the die ring until the head 108 of each stepped screw 104 abuts the adjacent jaw 97. Diameter position and corresponding elastomer spacer 10
3 is shown in the deformed state. Each of the illustrated collect assemblies 20
, 64, 77, and 96, in the pre-reduction position where the collet assembly is supported in the tapered hole 21 of the die ring, a plurality of resilient spacer means disposed between the collet jaws displace each jaw. It is understood that they are maintained in a desired angular relationship with each other.

This elastic spacer means maintains this angular relationship between each joint.
The collet assembly moves axially from its pre-reducing position to the fully reduced position and remains there. The resilient spacer means can also divide the collet assembly into two parts, thereby positioning the hose end assembly within the pocket formed by the inner circumferential surface of the collet jaw. Although a preferred embodiment of the invention has been described, it should be understood that various modifications and rearrangements of parts may be made without departing from the scope of the invention.

For example, it may be desirable in practice if the collet assembly is not completely separable into two or more halves, but rather separable along at least one radial line to allow for radial positioning of the hose end. Become.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the collet diameter reducing device showing the collet assembly disassembled in the axial direction, and Fig. 2 is a section showing the collet diameter reducing device and part of the hose end assembly before tightening. 3 is a front view similar to FIG. 2 showing the collet diameter reducing device in the tightening position, and FIG. 4 is an axis line of an embodiment of the tightening collet showing the collet halves separated. Figure 5 is a cross-sectional view of the collet shown in Figure 4 in the open position in the mold ring, Figure 6 shows the collet of Figure 4 in the fully retracted and clamped position in the mold block. 7 is a cross-sectional view showing the tightened hose end assembly with the collet and die ring in the position shown in FIG. 6; FIG. FIG. 9 is a sectional view of the collet shown in FIG. 8 taken along line 9--9; FIG. 10 is an axial view of another embodiment of the collet assembly; FIG. The figure is a sectional view taken along line 11-11 of the collet shown in Figure 10, and Figure 12 is a cross-sectional view of the collet shown in Figure 10.
0 is an axial view of the collet assembly shown in FIG. 10, FIG. 13 is a partial axial view showing still another embodiment of the collet assembly in a somewhat enlarged size, and FIG. 13
15 is a perspective view of one half of the collet assembly shown in FIG. 13; FIG. 15 is a perspective view of one half of the collet assembly shown in FIG. 13; 10: Collet diameter reducer, 11: Base plate, 16: Ram, 18
: Tightening mold assembly, 19: Mold ring, 20: Collet assembly, 21: Tapered hole, 23: Jaw, 27: Hose, 28: Fixture, 43: Elastic spacer member, 44: Collet half Part, 45: first radiation surface, 46: inner diameter curved surface, 47: outer diameter curved surface.

Claims (1)

Claims: 1. Consisting of a die block and a collet cooperating with the block, said die block having a tapered hole, and said collet having a plurality of rigid bodies positionable in a circular array within said tapered hole. the collet is axially movable within the bore between a first position and a second position, and the plurality of jaws define a generally semicircular separable subassembly. , each of the jaws is configured to correspond to the taper of the tapered bore such that the jaws follow the tapered bore radially inwardly when the collet moves from the first position to the second position. and an inner circumferential surface forming part of a common collet bore when the collet is in the second position, and each of the jaws has at least one common collet bore within the jaw assembly. two adjacent jaws, at least two corresponding jaws being generally radially fixed for passing the hose and sleeve radially into and out of pockets formed by the inner surfaces of said jaws; the corresponding separable jaws are separable from each other along the jaws in a predetermined angular relationship with each other when the jaws are in the first position and while the collet moves from the first position to the second position; resilient spacer means for positioning the radial surface, the resilient spacer means comprising an elastomer body secured to one of the jaws, and at least one of the opposing jaws having a substantially radial surface cooperating with the radial surface; , the elastomer body is fixed to the radiation surface, and the collet is attached to the first
a clamping die assembly for radially compressing the sleeve onto the exterior of the hose which is compressed between the opposing jaws when moved from the first position to the second position. 2. A die block having a truncated conical through hole with a substantially uniform taper angle, and a collet assembly movable in the axial direction within the through hole between a first position and a second position. the collet includes a plurality of rigid jaws in a circular arrangement, each of the jaws having a shape generally corresponding to the through hole, and further having a radially outer surface that engages the through hole; and radially inner surfaces cooperating to define a generally cylindrical die cavity when in the second position, each jaw having a pair of radially inner surfaces extending from the inner surface to the outer surface thereof. the at least one pair of jaws having substantially angularly spaced radial surfaces along the radial surfaces for passing the sleeve and hose radially into and out of the pocket formed by the inner surface of the jaws; separable, said collet including resilient spacer means adapted to maintain all of said jaws in a predetermined angular relationship with respect to each other while said collet is seated in said through-bore; As the elastic means moves axially from the first position to the second position, the elastic means is moved radially inwardly by the surface of the through hole, and the elastic means is an elastomer disposed between the radial surfaces of adjacent jaws. a material that is elastically compressed when the collet moves to the second position, and the jaws define a generally semicircular separable segmented assembly, each jaw of the segmented assembly being elastically compressed when the collet is moved to the second position; is a device for tightening sleeves on the outside of the hose, which are elastically fixed to each other.