CN201693329U - A high-precision tapered hole elastic rolling device for cone-sealed pipe joints - Google Patents

Abstract

The utility model relates to a high-precision tapered hole elastic rolling device for a cone-sealed pipe joint, which belongs to a mechanical processing tool. It consists of a tool handle body, a rectangular pressure spring, an outer sliding sleeve, a positioning pin shaft, a core sleeve, a rolling mandrel, a bearing sleeve, a thrust ball bearing, an adjusting pad, a collar sleeve, and a roller. Compared with the existing drilling, boring and polishing processing methods, the production efficiency can be doubled, and the surface roughness can be ≤ Ra0.4, stably Meet the requirements of the working drawings, and strengthen the metal surface of the inner hole of the tapered surface, and improve the strength and hardness of the surface layer. It has good versatility, and can quickly replace the rolling head that meets the size of the taper hole of the taper seal pipe joint. The elasticity of the spring can make the axial force and radial force change less when rolling the tapered hole. Compared with the rigid rolling device, the wear of the rolling head is reduced, and the service life of the rolling device is increased by 3~ 5 times.

Description

A high-precision tapered hole elastic rolling device for cone-sealed pipe joints

technical field

The utility model belongs to mechanical processing tools, and relates to a high-precision tapered hole elastic rolling device, in particular to a high-precision tapered hole elastic rolling device for cone-sealed pipe joints.

Background technique

Cone seal pipe joints are mainly used for precision cone seals and are equipped with auxiliary seals such as O-rings (as shown in Figure 6), so the seals are reliable and stable, and are widely used in electromechanical, light industry, petrochemical and other industries. Mainly used in hydraulic, pneumatic and instrument measurement of high and medium pressure transmission system pipelines with oil and gas as the medium. When the conical sealing pipe joint is used in the seamless steel pipe, water gas pipe (including various stainless acid-resistant steel pipes) system, it can avoid the harm caused by the leakage of liquid in the pipe during the production and processing of various instruments and equipment .

之间。在国内现有加工技术中通常是采用钻孔、扩孔、铰孔或是镗孔、抛光的方法来加工。但上述加工方法加工的锥孔表面很难达到图纸的表面粗糙度要求，而且加工效率低。As shown in Figure 7, the taper seal pipe joint, the taper of the inner taper hole of the pipe joint in the figure is β, and the surface roughness requirement of the inner taper hole is Ra0.4. According to the national standard JB/T6381.1, the inner diameter of the pipe is

between. In the domestic existing processing technology, usually adopt the method of drilling, reaming, reaming or boring, polishing to process. However, the surface of the tapered hole processed by the above processing method is difficult to meet the surface roughness requirements of the drawing, and the processing efficiency is low.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the utility model provides a universal high-precision tapered hole rolling device for taper-sealed pipe joints. The device is used to process the inner hole of the tapered surface of the pipe joint, with high production efficiency, good versatility, and surface Roughness can be ≤Ra0.32, which can meet the requirements of working drawings stably.

The technical scheme of the utility model is as follows:

The device described in the utility model is composed of a tool handle body, a rectangular pressure spring, an outer sliding sleeve, a positioning pin, a core sleeve, a rolling mandrel, a bearing sleeve, a thrust ball bearing, an adjustment pad, a turnbuckle, a roller, and the like. in:

(1) One end of the shank body is a Morse taper shank, and the taper shank can be installed in the taper hole of the tailstock sleeve of the machine tool for accurate centering. The other end of the handle body is in the shape of a cylinder, and its inner hole is slidingly matched with the outer diameter of the core sleeve, and the two are connected by a positioning pin that passes through a waist-shaped groove in the middle of the core sleeve. A rectangular pressure spring is placed in the hole at one end of the core sleeve. One end of the spring is in contact with the bottom of the inner cavity of the knife handle. Because one side of the waist-shaped groove of the core sleeve is in contact with the positioning pin, the core sleeve has a certain spring preload pressure. When the core sleeve is subjected to a certain axial force, it can freely retract into the body of the handle. Due to the elasticity of the spring, the axial force and radial force suffered when rolling the tapered hole are less changed, compared with the rigid rolling device, the wear of the rolling head is reduced, and the service life of the rolling device is prolonged.

(2) The outer sliding sleeve is connected to the other side of the core sleeve through the internal thread at one end, and can follow the core sleeve to slide on the outer diameter of the tool handle during work. Prevents dowel pins from coming off and dust and dirt from entering the sliding fit surface.

(3) As shown in Figure 2, the rolling head of the device is composed of rolling mandrel, bearing sleeve, thrust ball bearing, adjusting pad, turnbuckle and roller. The outer diameter cylindrical surface at the right end of the rolling mandrel can be installed in the mounting hole of the device core sleeve and fixed by a set screw. Loosening the set screw can quickly replace the rolling head that meets the size of the taper hole of the taper seal pipe joint. The head of the cylinder at the other end of the rolling mandrel has a tapered surface, and the outer diameter and taper of the cone are determined according to the size and angle of the inner cone to be rolled. The bearing sleeve is connected with the external thread of the middle step of the rolling mandrel through the internal thread. The inner hole of the bearing sleeve is installed with the step surface of the turnbuckle, the thrust ball bearing and the adjustment pad. When the bearing sleeve is screwed on the rolling mandrel, the adjustment pad is used to adjust the gap between the step surface of the turnbuckle and the thrust ball bearing. The gap allows the turnbuckle to rotate flexibly.

(4) The inner hole of the turnbuckle is matched with the outer diameter of the left end of the rolling mandrel, and the step plane at the right end of the turnbuckle is in contact with the thrust ball bearing, so that it can still rotate freely and flexibly after bearing the axial force. A plurality of rectangular grooves are evenly distributed on the taper surface at the left end of the turnbuckle, which are used to place rolling rollers. The cross-section of the rectangular groove as shown in Figure 3 is made into an inverted taper, so that the rollers can be prevented from falling off after the rollers are placed. The rollers can be replaced by hardened standard bearing steel needle rollers, or can be made of high-speed steel or hard alloy materials. The number of rollers is determined according to the size of the rolled hole, generally 3 to 6.

(5) Principle of rolling processing: In the rolling processing of the inner taper hole, the roller of the rolling head rolls spirally along the circumference of the surface of the processed cone hole wall, and imposes a certain axial force on the processed hole wall. And radial pressure, the inner hole of the workpiece is under the rolling force of the roller, and the surface metal produces elastic deformation and plastic deformation. Plastic deformation not only changes the shape of the machined surface of the part, but also changes its structure and physical properties. The unevenness peaks and troughs on the surface of the workpiece are ironed and filled, thereby reducing the surface roughness value and improving the workpiece. Processing accuracy, the crystal lattice of the rolled layer metal produces shear slip, distortion, elongation, fibrosis and fragmentation, making the structure compact, the grains thinner, and the grain shape also extends along the direction of the largest deformation. At the same time, compressive stress is generated in the metal surface, which strengthens the metal surface and improves the strength and hardness of the surface.

The influence of the surface roughness of the pre-processed inner hole of the workpiece. It is known through experiments that the pre-processed surface roughness of the inner hole of the workpiece, residue and copying will affect the surface roughness of the inner hole after rolling. Figure 8 is made of SUS316 stainless steel The relationship curve of surface roughness before and after taper rolling of pipe joint workpiece. It can be seen from the relationship curve that as the surface roughness value before rolling decreases, the surface roughness value after rolling also decreases. When the pre-processing surface roughness is Ra6.3, the surface roughness after rolling can be ≤Ra0.4.

The utility model has the following effects:

Compared with drilling, boring, and polishing methods, the production efficiency can be doubled by using this device to roll the inner hole of the tapered surface of the taper-sealed pipe joint, and the surface roughness can be ≤ Ra0.4, stably reaching the working drawing Requirements, and strengthen the metal surface of the inner hole of the tapered surface, and improve the strength and hardness of the surface layer. It has good versatility and can quickly replace the rolling head that meets the size of the taper hole of the taper seal pipe joint. The elasticity of the spring can make the axial force and radial force change less when rolling the tapered hole. Compared with the rigid rolling device, the wear of the rolling head is reduced, and the service life of the rolling device can be increased by 3 ~5 times.

Description of drawings

Figure 1 is a schematic diagram of a high-precision tapered hole elastic rolling device for a cone-sealed pipe joint of the utility model;

Figure 2 is an enlarged view of the rolling head part of the device;

Fig. 3 is a partial sectional view of the rolling cone part in Fig. 2;

Figure 4 Partial view of the rolling head with the maximum diameter of the cone end being C1;

Figure 5 Partial view of the rolling head with the maximum diameter of the cone end being C2;

Fig. 6 Assembly diagram of cone sealing pipe joint;

Fig. 7 Schematic diagram of taper sealing pipe joint parts;

Fig.8 The relationship curve of the surface roughness before and after the tapered hole rolling of the pipe joint

1-handle body, 2-rectangular pressure spring, 3-outer sliding sleeve, 4-location pin, 5-core sleeve, 6-set screw, 7-rolling mandrel, 8-bearing sleeve, 9-adjustment Pad, 10-thrust ball bearing, 11-turnbuckle, 12-roller

Detailed ways

As shown in Figure 1, the device described in the utility model consists of a tool handle body 1, a rectangular pressure spring 2, an outer sliding sleeve 3, a positioning pin shaft 4, a core sleeve 5, a set screw 6, a rolling mandrel 7, and a bearing sleeve 8. Adjusting pad 9, thrust ball bearing 10, turnbuckle 11, roller 12 form. in:

(1) The right end of the tool handle body 1 is a Morse taper shank, which can be installed in the taper hole of the tailstock sleeve of the machine tool and accurately centered. The left end of knife handle body 1 is cylinder-shaped, and its inner hole is slidingly matched with the outer diameter of core sleeve 5, and the two are connected by a positioning pin 4 passing through a waist-shaped groove in the middle part of core sleeve 5. Place the rectangular pressure spring 2 in the hole at the right end of the core sleeve 5, the right end of the rectangular pressure spring 2 contacts with the bottom of the knife handle body 1 inner cavity, because the right side of the waist-shaped groove of the core sleeve 5 contacts with the positioning pin 4, so that The core sleeve 5 has a certain spring preload pressure. When the core sleeve 5 is subjected to a certain axial force during work, it can freely retract into the handle body 1 . Due to the elasticity of the rectangular pressure spring 2, the axial force and radial force suffered when rolling the tapered hole are less changed. Compared with other rigid rolling devices, the wear of the rolling head is reduced and the rolling device is extended. service life.

(2) The outer sliding sleeve 3 is connected to the left end of the core sleeve 5 through the internal thread at the left end, and can slide along the core sleeve 5 on the outer diameter of the handle body 1 during operation. It can prevent the positioning pin shaft 4 from falling off and dust and dirt from entering the sliding fit surface.

(3) As shown in Figure 2, the rolling mandrel 7, the bearing sleeve 8, the thrust ball bearing 10, the adjusting pad 9, the turnbuckle 11, and the roller 12 form the rolling head of the device. The external diameter cylindrical surface B of rolling mandrel 7 right-hand sides, (seeing Fig. 4 and Fig. 5) can be installed in the mounting hole of core cover 5 by, and is fixed by set screw 6. Loosen the set screw 6 to quickly replace the rolling heads of different sizes that meet the tapered hole C1 (Fig. 4) or C2 (Fig. 5) series of the taper seal pipe joint. The head of the cylinder at the left end of the rolling mandrel 7 has a tapered surface, and the outer diameter and taper size of the cone are determined according to the inner cone of the rolled cone-sealed pipe joint. The bearing sleeve 8 is connected with the external thread of the middle step of the rolling mandrel 7 through an internal thread. The inner hole of the bearing sleeve 8 is equipped with the step surface of the turnbuckle 11, the thrust ball bearing 10 and the adjustment pad 9. When the bearing sleeve 8 is screwed on the rolling mandrel 7, the adjustment pad 9 is used to adjust the turnbuckle 11 The clearance between the stepped surface of the step surface and the thrust ball bearing 10 enables the turnbuckle 11 to rotate around the rolling mandrel 7 flexibly.

(4) The inner hole of the turnbuckle 11 is in clearance fit with the outer diameter of the left end of the rolling mandrel 7, and the stepped plane at the right end of the turnbuckle 11 is in contact with the thrust ball bearing 10, so that the turnbuckle 11, after bearing the axial force, Still able to rotate freely and flexibly. Several rectangular grooves are evenly distributed on the taper surface of the turnbuckle 11 left end, which are used to place the roller 12 for rolling. The cross-section of rectangular groove as shown in Figure 3 is made into reverse taper, and taper angle is α, can prevent roller 12 from coming off after placing roller 12 in the tapered groove of turnbuckle 11 like this. Roller 12 can be selected for use to substitute through hardened standard bearing steel needle roller, also available high-speed steel or cemented carbide material make. The quantity of the rollers 12 is determined according to the size of the bore to be rolled, generally 3 to 6.

(5) The principle of rolling processing: in the rolling process of the taper hole of the tapered seal pipe joint, the roller 12 of the rolling head rolls spirally along the circumference on the surface of the processed cone hole wall, and applies pressure to the processed hole wall. Under a certain axial and radial pressure, the inner hole of the workpiece is subjected to the rolling force of the roller 12, and the surface metal produces elastic deformation and plastic deformation. Plastic deformation not only changes the shape of the machined surface of the part, but also changes its structure and physical properties. The unevenness peaks and troughs on the surface of the workpiece are ironed and filled, thereby reducing the surface roughness value and improving the workpiece. Processing accuracy, the crystal lattice of the rolled layer metal produces shear slip, twist, elongation, and fibrosis, making the structure tighter, the grains thinner, and the grain shape also extends along the direction of the largest deformation. Compressive stress is generated in the metal surface layer, which strengthens the metal surface and improves the strength and hardness of the surface layer.

Through experiments, it can be known that the surface roughness of the pre-processed inner hole of the workpiece and the methods of residue and copying will affect the surface roughness of the inner hole after rolling. Figure 8 shows the surface roughness before and after rolling of the tapered hole of the workpiece made of SUS316 stainless steel pipe joint. degree relationship curve. It can be seen from the relationship curve that as the surface roughness value before rolling decreases, the surface roughness value after rolling also decreases. When the pre-processing surface roughness is Ra6.3, the surface roughness after rolling can be ≤Ra0.4.

Claims (4)

1. high-precision elastic tapered bore rolling device of cone sealing pipe joint, it is characterized in that: described device comprises toolholder body (1), outer sliding sleeve (3), core retainer plate (5) and rolling head; Toolholder body (1) one end is a Morse taper shank, and the endoporus of the other end that toolholder body (1) is cylinder-shaped and core retainer plate (5) external diameter are slidingly matched, and toolholder body (1) is connected by the alignment pin (4) that is through core retainer plate (5) middle part kidney slot with core retainer plate (5); Place rectangular pressure spring (2) in the hole of core retainer plate (5) one ends, make core retainer plate (5) have certain spring preload pressure, when core retainer plate in the work (5) is subjected to bigger axial force, can indentation in toolholder body (1); Outer sliding sleeve (3) is connected with core retainer plate (5) another side by the internal thread of an end, follows core retainer plate (5) during work and slides on toolholder body (1) external diameter, prevents that alignment pin (4) from coming off and the dust dirt enters the surface that is slidingly matched; Rolling head is by roll extrusion axle (7), bearing holder (housing, cover) (8), thrust ball bearing (10), adjusting pad (9), Hua Lan cover (11) and roller (12) are formed, the external diameter face of cylinder B of roll extrusion axle (7) right-hand member is installed in the installing hole of core retainer plate (5), the cylindrical head of roll extrusion axle (7) other end has a cone, the outside dimension of cone and tapering size are according to being determined by the size of roll extrusion inner cone and angle, bearing holder (housing, cover) (8) is connected by the external screw thread of internal thread with roll extrusion axle (7) middle bench, bearing holder (housing, cover) (8) endoporus is equipped with step surface and thrust ball bearing (10) and the adjusting pad (9) of Hua Lantao (11), when bearing holder (housing, cover) (8) is tightened on the roll extrusion axle (7), adjusting pad (9) is used to adjust the step surface of Hua Lantao (11) and the gap between the thrust ball bearing (10), and Hua Lantao (11) can be rotated neatly; Even several rectangular channels that distribute are used to lay rolling roller (12) on the conical surface of Hua Lan cover (11) left end.

2. the described device of claim 1, it is characterized in that: the external diameter face of cylinder B of roll extrusion axle (7) right-hand member is fixed in the installing hole of core retainer plate (5) by holding screw (6), unclamps holding screw (6) and can change the rolling head that meets cone sealing pipe joint taper hole size fast.

3. the described device of claim 1, it is characterized in that: the quantity of roller (12) is 3～6, and the cross section of rectangular channel is made into back taper.

4. the described device of claim 3, it is characterized in that: roller (12) selects for use the standard rolling bearing steel needle roller through hardening to substitute, or makes of high-speed steel or Hardmetal materials.

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