FR2988801A1 - Device for connecting valve part to valve body for forming pressure regulation valve, has press punch including press body to deform plastically valve body, where deformation produces connection by force and/or shape of part with valve body - Google Patents

Abstract

The device has a fixing installation (5) adapted to receive a valve body (4), and comprising fixation units (6) to fix position of the body along axial and/or radial direction. A locating pin (7) is installed in a guide bore (3) of the body to coaxially align a valve seat (1) of a valve part (2) relative to the bore. A press punch (8) in the installation slides axially relative to the installation and comprises a press body (9) to deform plastically the valve body. The deformation of the valve body produces connection by force and/or by shape of the valve part with the valve body. An independent claim is also included for a method for connecting a valve part to a valve body.

Description

Field of the Invention The present invention relates to a device for connecting a valve member constituting a valve seat to a valve body having a guide bore for providing an electromagnetically controlled valve, particularly a control valve of pressure. The invention also relates to a method for connecting a valve member constituting a valve seat to a valve body having a guide pin for producing an electromagnetically controlled valve, particularly a control valve. pressure. The device and the method have the function of enabling the connection to be made by force and / or by the shape of the two parts.

STATE OF THE ART Bonding by force and / or the shape of a valve member to a valve housing is usually done by a process of transformation, such as for example crimping. Under these conditions, the valve member is placed in a hollow cylinder-shaped extension of the valve housing and the edge of the hollow cylinder-shaped extension is folded around the valve member thereby forcing a connection. In general, to transform a device, a known device of a press body is used as a tool. The press body is pressed against the edge of the hollow cylindrical extension of the valve housing and certain defined areas of the press body undergo deformation of the edge and thereby a connection by force and / or shape of the valve member to the valve housing. It must be ensured that the valve seat of the valve body and the guide bore of the valve housing are aligned coaxially. Coaxial mounting errors may have consequences such as a valve body subsequently installed in the guide bore to be subjected to the strong pressure thrust from the fuel and the guide plane of a valve closure member cooperating with the valve seat results in excessive strain on the valve closing element and / or the valve seat and thus greater wear in this area. It can also result in leaks of the valve. In addition, in the case of a processing method, it must be ensured that the tool and the workpiece are aligned coaxially to produce a regular plastic deformation. OBJECT OF THE INVENTION The object of the present invention is therefore to develop a device and method for connecting a valve member to a valve body and which largely avoids the nature of the contact fault. DESCRIPTION AND ADVANTAGES OF THE INVENTION The present invention relates to a device for connecting a valve member constituting a valve seat to a valve body having a guide bore for providing an electromagnetically actuated valve, particularly a pressure relief valve. pressure regulating device, characterized by - a fixing device for receiving the valve body, and comprising means for fixing the position of the valve body in the axial and / or radial direction, - a centering pin which can be placed in the guide bore of the valve body for coaxially aligning the valve seat of the valve member with the guide bore of the valve body; - a press punch which is placed in the fastening device and slides axially relative to therewith, the punch having a press body for plastically deforming the valve body, and the plastic deformation of the valve body using a force and / or shape connection of the valve member with the valve body. The fastening device having means for locking the valve body in position enables the valve body including the valve part integrated therein to be fixed after being aligned relative to the tool. ie to the press corps. However, it is necessary to align the valve part in relation to the valve body. This alignment is done by means of the centering pin which is introduced into the guide bore of the valve body and which is engaged with the valve seat of the valve part to coaxially align the seat of the valve body. valve of the valve part with the guide bore of the valve body. The centering pin has for this purpose an end facing the valve part which protrudes from the guide bore of the valve body and is adapted to the shape of the valve seat. For example, the valve seat and the end of the centering stud may each have a conical shape. When the tapered end of the centering pin engages the valve seat, the desired centering is automatically achieved. The centering stud remains in engagement with the valve seat during processing, so that the application of the force precludes any subsequent coaxiality deficiencies between the valve seat of the valve member and the guide pin. of the valve body. In the proposed device, the press body is guided by a press punch biased from the outside by a defined compressive force. This ensures a regular distribution of efforts.

Preferably, the press body comprises press surfaces which preferably have at least partly a conical and / or spherical shape. Preferably, the press surfaces are preceded by guiding surfaces of at least partially conical or cylindrical shape. These upstream guide surfaces produce the centering of the valve body including the valve part with respect to the press surfaces before the press surfaces come into contact with the valve body. This ensures that the workpiece and tool will be coaxially aligned and allow for regular plastic deformation of the valve body. The alignment of the workpiece by the guide surfaces of the tool, i.e. the press body, assumes that the workpiece is not yet locked in position, at least in the radial direction. In addition, sufficient radial clearance between the workpiece and the fixture is required to allow such alignment. Advantageously, the position-locking means of the valve body comprise at least one bearing surface acting in the axial and / or radial direction. During the alignment of the workpiece relative to the tool, there is no direct or indirect contact of the workpiece with the support surface, which allows at least one radial movement of the workpiece.

Preferably, the valve body is first movably held in both the radial direction and the axial direction. When the press body is advanced towards the valve member (after aligning the valve body coaxially with the tool by the press body guiding surfaces), the press surfaces come into contact with the valve body. They drive the valve body through the press body until it abuts at least against an axial abutment surface and / or radial, directly or indirectly to be at least locked in position in the axial direction.

The abutment surface of the fixing device can thus cooperate with an abutment surface made on the valve body or with a stop body fixed to the valve body. The stop body has the advantage of only indirectly soliciting the valve body. The abutment body may be constituted, for example, by a ring enclosing the valve body and preferably removably attached to the valve body for positioning the valve body without abutment member in the fastener and being able to remove it. again the fixing device without the stop body. In the case of an annular abutment member, the attachment may for example be through a rib on the inner peripheral side of the ring and which enters a peripheral groove on the outer side of the valve body. According to another feature, the press punch comprises a clamping pin passing through the press body and sliding in the axial direction relative to the press punch and the press body against the force developed by a spring device. The clamping bolt abuts against the valve member as the press punch is moved toward the valve body. During the further movement of the press punch, the spring device generates a prestressing or securing force which urges the valve member installed in the housing body toward the centering stud. This is in contrast to a radial exhaust movement of the valve part during the process of transformation. The prestressing or fixing force is predefined by the force developed by the spring of the spring device.

According to another advantageous characteristic, the spring device comprises at least one Belleville spring and preferably several Belleville springs, stacked. For the same size, compared to a compression coil spring, a Belleville spring stack produces a significantly higher prestressing or fixing force. preferably, the prestressing or fixing force Fv is preferably such that Fv> 1000 N, preferably such that Fv> 5000 N and even more preferably Fv> 8000 N. According to another preferred characteristic , the centering pin 15 which is located in the guide bore of the valve body is spring-loaded directly or indirectly against the fixing device. The spring allows axial movement of the centering pin including the valve body and the valve member relative to the attachment fixture, so that the valve body can be moved to fix the position in the direction of rotation. the abutment surface of the fastening system. When the valve body is fixed in position, the force developed by the spring urges the centering stud against the valve seat of the valve member. The invention also relates to a method for connecting a valve member constituting a valve seat to a valve body having a guide pin for producing an electromagnetically controlled valve, particularly a pressure control valve, which method is characterized in that - in a first step, the valve body and the valve member are installed in a fixture and are aligned coaxially with a centering pin inserted into the guide bore of the valve body, - in a second step, a press punch with a press body is introduced into the fixing device and is moved in the direction of the valve body so that the press body passes over the valve body, the press body producing via at least one guide surface upstream of a press surface, first of all the centering of the valve body including the e valve with respect to longitudinal faxe the press punch and the press body and then, by the press surface bearing against the valve body, an axial sliding of the valve body including the valve part in the direction of a deposition surface of the fastening device, until the valve body abuts against the abutment surface and is at least fixed in position in the axial direction, * furthermore, a through clamping bolt the press body is supported by a spring device against the press punch and bears against the valve member, so that, with increasing movement of the press punch, the valve member is pushed by force of the spring device against the valve body and / or the centering pin, and - in a third step, the pressing surface of the press body produces a plastic deformation of the valve body to make a connection by force and / or pa r the shape of the valve part to the valve body. The three main steps of the method according to the invention thus comprise the coaxial alignment of the valve part and the valve body, with respect to each other and with respect to the tool, the position fixing of the Valve body and valve body as well as transformation once the position is fixed. This avoids to a very large extent the coaxial defects between the valve seat of the valve part and the guide pin of the valve body. Indeed, after alignment of the two parts relative to each other and relative to the tool, the blocking in position of the parts to be connected makes that virtually only axial forces act on the parts during the process of transformation . It is furthermore opposed to the development of forces in the transverse direction in that, beforehand, the parts are aligned with respect to the longitudinal faxing of the tool. This ensures a central action of the efforts. Preferably, the clamping bolt and the spring device apply in the axial direction a prestressing or fixing force Fv such that Fv> 1000 N, preferably Fv> 5000 N and even more preferably Fv> 8000 N on the valve part. Such high prestressing or fixing force prevents any transverse forces from influencing the position of the aligned and connecting parts.

Finally, according to another characteristic of the method, the invention relates to a device as described above. The centering dowel of the device allows a coaxial alignment of the parts to be connected and the press body allows, thanks to its guiding surfaces, to coaxially align the parts to be connected relative to the tool and through the press surface, there will be an axial sliding of the parts towards the bearing surface which produces a blocking position of the parts at least in the axial direction. For locking in position, it also uses a clamping pin coming into abutment with the valve member, passing through the press body and pressed against the press punch by a spring device. Finally, the press surface of the press body allows the transformation of the valve body and thus the connection by force and / or shape of the valve member with the valve body. Drawings The present invention will be described below in more detail with the aid of a preferred embodiment shown in the accompanying drawings in which: - Figure 1 is a schematic longitudinal section of a preferred embodiment of the device FIG. 2 is a diagrammatic sectional view on an enlarged scale of the press body of the device of FIG. 1, the left side showing a first preferential development of the press surface and the right side, a second mode. preferred embodiment of the pressing surface of the press body, - Figure 3 is an enlarged schematic sectional view of the locking means in position of the device of Figure 1, and - Figures 4a-4d show the device of Figure 1 in the implementation of the method of the invention.

DETAILED DESCRIPTION OF EMBODIMENT OF THE INVENTION According to FIG. 1, the device shown for connecting a valve member 2 forming a valve seat 1 has a valve body 4 having a guide bore 3 for producing an electromagnetically controlled valve. , in particular a pressure regulating valve comprising a fixing installation 5 provided with a hollow cylindrical base body 5.1, as well as a bottom plate 5.2 releasably connected by screws, as well as a punch of press 8 movable axially with respect to the fixing installation 5 and mounted in the fixing installation 5; the press punch comprises a press body 9 with press surfaces 10 for plastically deforming the valve body 4. The press punch 8 including the press body 9, is moved towards the valve body 4 received in the press 5, after the valve part 2 has been previously installed in the valve body 4. The device also comprises a centering pin 7 installed coaxially with the direction of the valve part 2 and the valve body 4 in its bore 3 to cause the tip of the centering pin 7 facing the part 2 to engage the valve seat 1 of the part 2. The coaxial alignment of the parts to be connected relative to the tool or to the press body 9, is via a guide surface 11 of the press body 9, upstream of the press surface 10; this guide surface serves to drive the press body 9 on the valve body 4. The guide surface 11 is mainly conical in shape decreasing and thus it has a cylindrical shape to allow the automatic centering of the parts with respect to the tool (Figure 2). The guide surface 11 joins the press surface 10 which is mainly spherical in shape (see FIG. 1 and FIG. 2 on the left side). Alternatively, the press surface 10 may also have a spherical shape (see right side FIG. 2).

The press body 9 is traversed by a clamping pin 14 supported by a spring device 15 with several Belleville springs stacked on the press punch 8. As soon as the press body 9 passes over the valve body 4 and the surface 11 aligns the parts relative to the tool, the clamping pin bears against the valve part 2. During the subsequent movement of the press punch 8, the valve part 2 is pushed by the clamping pin 14 and the force developed by the spring device 15 against the valve body 4 and the centering pin 7. Then, the press surface 10 of the press body 9 bears against the valve body 4 which moves towards the abutment surface 12 of the fixing device 5 serving as a means 6 for fixing the position of the valve body 4. By being fixed against the abutment surface 12, the valve body 4 is fixed in position at least in the direction a xiale. To prevent the valve body 4 from directly abutting the fixing surface 2, the valve body 4 is connected to an annular fixing body 13 which is engaged by a rib formed on the inner peripheral side in a peripheral groove 18 of the valve body 4. The connection is removable to allow removal of the abutment body 13 after the transformation operation and thus allow the valve body 4 to be taken including the valve part 2 to remove them from the installation 5 (Figure 3). To allow axial movement of the valve body 4 in the direction of the abutment surface 12 in the fastening device 5, the centering stud 7 is supported by a spring 16 against the fastening device 5 or a body. bearing 19 of the attachment installation 5 (see Figure 3). The force developed by the spring 16 further pushes the centering pin 7 into the valve seat 1 of the valve member when the valve body 4 including the valve member 2 is moved towards the abutment surface. 12. During this movement, the valve body 4 can execute a radial movement because there is sufficient radial clearance between the stop body 13 and the fixing installation 5. In the present embodiment, the set radial distance between the abutment body 13 and the fixing device 5, is of the order of 500 gm, which allows the radial alignment of the valve body 4 by the guide surface 11 of the press body 9. The process According to the invention will be described below in more detail with the help of Figures 4a-d using the device of Figure 1. According to Figure 4a, the parts to be joined, namely the valve body 4 and the valve part 2, are already placed in the fixing installation 5; these parts are aligned coaxially with one another by the centering pin 7 introduced into the guide bore 3 of the valve body 4. The centering stud 7 is held by the force developed by the spring 16 in support against the valve seat 1 of the valve part 2. The valve body 4 has been connected to the abutment body 13 and the press punch 8 has been placed in the fixing installation 5. Then, by exerting a force of defined thrust, the press punch 8 is moved towards the valve body 4, so that firstly the press body 9 comes into contact with the valve body 4 through the guide surface 1 and aligns radially the parts to be assembled relative to the tool and this before the stop body 13 connected to the valve body 4, abuts against the abutment surface 12 of the fixing installation 5 and in this way produces the fixing from the position of the valve body 4 to less in the axial direction. In the process step shown in FIG. 4b, the consecutive position of the valve body is radially aligned and fixed (see FIG. 4b). While the press punch 8 continues to move towards the valve body 4, the clamping pin bears against the valve part 2 and fixes the position of the valve part by the spring force developed by the device. spring 15 which presses the clamping pin 14 against the press punch 8 (see Figure 4c). Then, the transformation is carried out, the press surface 10 of the press body 9 pushing the zone of the edge of the valve body 4 radially inwards, that is to say around the valve part 2 (see FIG. 4d). The transformation makes a connection by force and / or the shape of the valve part 2 with the valve body 4 and the assembly can thus be removed in common from the fixing installation 5. The pressure force necessary to the transformation is preferably applied from the outside. As shown in FIG. 4a, it is possible to use for this purpose a force transmission element bearing the reference 20.10.

Claims (1)

CLAIMS 1 °) Device for connecting a valve member (2) constituting a valve seat (1) to a valve body (4) having a guide bore (3) for producing an electromagnetically controlled valve, in particular a valve pressure regulating device, characterized by - a fixing device (5) for receiving the valve body (4), * the fixing device (5) having means (6) for fixing the position of the valve body ( 4) in the axial and / or radial direction, - a centering pin (7) which can fit into the guide bore (3) of the valve body (4) to coaxially align the valve seat (1) with the valve part (2) with respect to the guide bore (3) of the valve body (4), - a press punch (8) which is placed in the fastening device (5) and slides axially with respect to that (5), this punch comprising a press body (9) for plastically deforming the valve body (4). ), * the plastic deformation of the valve body (4) producing a connection by force and / or the shape of the valve part (2) with the valve body (4). 2) Device according to claim 1, characterized in that the press body (9) comprises press surfaces (10) preferably at least partly conical and / or spherical and which upstream of the press surfaces ( 10) are preferably at least partly conical and / or cylindrical guide surfaces (11) for centering the valve body (4) including the valve part (2) with respect to the press surfaces (10) before the press surfaces (10) do not come into contact with the valve body (4). 3) Device according to claim 1, characterized in thatthe means (6) for fixing the position of the valve body (4) comprise at least one abutment surface (12) acting in the axial direction and / or radial. Device according to Claim 3, characterized in that the abutment surface (12) cooperates with an abutment surface on the valve body (4) or with an abutment body (13) attached to the valve body ( 4). Device according to claim 1, characterized in that the press punch (8) has a clamping pin (14) which passes through the press body (9) and is slidable against the spring force developed by a spring device (15) in the axial direction with respect to the press punch (8) and the press body (9). 6 °) Device according to claim 5, characterized in that the spring device (15) comprises at least one Belleville spring, preferably several Belleville springs stacked. 7 °) Device according to claim 1, characterized in that the centering pin (7) which is placed in the guide bore (3) of the valve body (4) is supported by a spring (16) directly or indirectly against fixing installation (5). 8 °) Method for connecting a valve member (2) constituting a valve seat (1) to a valve body (4) having a guide pin (3) for producing an electromagnetically controlled valve, in particular a control valve method, characterized in that - in a first step, the valve body (4) and the valve part (2) are installed in a fastening device (5) and are coaxially aligned with one another. centering bolt (7) inserted in the guide bore (3) of the valve body (4), - in a second step, a press punch (8) is introduced with a press body (9) into the installation fastening means (5) and moved in the direction of the valve body (4) so that the press body (9) passes over the valve body (4), the press body (9) producing by via at least one guide surface (11) upstream of a press surface (10), first centering of the valve body (4) including the valve part (2) with respect to the longitudinal axis of the press punch (8) and the press body (9) and then by the pressing surface (10) pressing against the valve body (4), axial sliding of the valve body (4) including the valve part (2) towards a deposition surface (12) of the fastening device (5), up to the valve body (4) abuts against the abutment surface (12) and is at least fixed in position in the axial direction; furthermore, a clamping pin (14) passes through the press body (9). ) and supported by a spring device (15) against the press punch (8), bears against the valve member (2) so that with the progression of the press punch (8) movement, the workpiece valve (2) is pushed by the force of the spring device (15) against the valve body (4) and / or the centering pin (7), and - in a third step, the press surface (10) d the press body (9) produces a plastic deformation of the valve body (4) to effect a force and / or shape connection of the valve member (2) to the valve body (4). Method according to Claim 8, characterized in that the clamping bolt (14) and the spring device (15) serve to apply a preload or fastening force Fv acting in the axial direction such that Fv> 1000 N, preferably Fv> 5000 N, and even more preferably Fv> 8000 N, applied to the valve member (2). 10 °) A method according to claim 8 or 9, characterized in that it uses a device according to any one of claims 1 to 7 to implement the method.