CN102501023A - Compression molding method without action of inner rings for integral self-lubricating joint bearings - Google Patents

Abstract

The invention relates to a molding method for an integral self-lubricating joint bearing without the action of an inner ring, which is characterized in that: a self-lubricating layer is attached to the inner surface of the outer ring blank, and the inner ring of the bearing is placed on the outer ring adhered with the self-lubricating layer The blank is placed on the mandrel in the cavity of the lower mold. The cavity of the upper mold and the lower mold are composed of a conical surface and a cylindrical hole. According to the pressing time-displacement curve, the molding process is precisely controlled. When the upper mold reaches the target position and the inner surface of the outer ring blank becomes an inner spherical surface, the molding is stopped and the mold is opened to obtain a self-lubricating spherical plain bearing that meets the clearance requirements. The invention solves the problem that the existing forming process of the integral self-lubricating joint bearing causes damage to the self-lubricating layer, the forming process of the inner surface of the bearing outer ring and the bearing clearance are controllable, and the bearing manufactured by the process has a long service life and is reliable Advantages of high sex.

Description

Integral self-lubricating joint bearing without inner ring action molding method

technical field

The invention relates to the field of bearing manufacturing, in particular to a compression molding method of a joint bearing.

Background technique

At present, the known self-lubricating joint bearing is composed of an inner ring with an outer spherical surface, an outer ring with an inner spherical surface and a self-lubricating layer. According to the structure of the outer ring, it is divided into: single-slit type, double-slit type, double-half type and integral type. The self-lubricating layer on the inner spherical surface of the outer ring is the key functional structure of the bearing. Whether it is damaged during manufacturing has a great impact on its performance. decisive role. Although the inner surface of the single-slit self-lubricating spherical plain bearing is easy to manufacture, the inner ring can be directly pressed into the outer ring with the slit during assembly, but it is very easy to cause damage to the self-lubricating layer on the inner surface of the outer ring and the outer surface of the inner ring. , in use, the uneven stress caused by the slit reduces the bearing life and reliability; although the double-slit self-lubricating joint bearing does not damage the lubricating layer during manufacturing, the surface of the outer ring and the self-lubricating layer are cut In use, the non-integral structure makes the gap uneven, the force uneven, the reliability is low, and the assembly structure is relatively complicated; the double half self-lubricating joint bearing is connected by several bolts to the two half outer rings, The structure is complex and the assembly requirements are high. The two halves of the outer ring and the self-lubricating layer are also non-integral structures, with uneven gaps and uneven stress. Moreover, this structure is not suitable for small self-lubricating joint bearings and has low reliability.

The outer ring and the self-lubricating layer of the integral self-lubricating spherical plain bearing are an integral structure. The outer ring and inner ring have a simple structure, and the clearance conditions meet the requirements of the finished bearing. The reliability is high in use. The existing manufacturing technology uses the forging method for the outer ring Envelope forming on the inner ring, when the outer ring is formed, the inner ring is first put on the mandrel, and then the outer ring blank is placed outside the inner ring, and then the outer ring is pressed so that the inner surface of the outer ring locks the outer ring of the inner ring. On the spherical surface, and then machine the outer ring, by controlling the interference between the mandrel and the inner ring ["Bearing" 1973, (6)], there is a gap between the self-lubricating layer and the outer surface of the inner ring, that is, the self-lubricating spherical plain bearing Clearance, in the manufacturing process of integral self-lubricating spherical plain bearings, in order to form the inner spherical surface of the outer ring and the bearing clearance that meets the requirements of the finished bearing, the self-lubricating layer undergoes two non-uniform and severe extrusion and deformation, which can easily cause compression Therefore, in the manufacture of integral self-lubricating joint bearings, the development of forming technology without inner ring action is necessary.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art, aiming at integral self-lubricating joint bearings, to provide an integral self-lubricating joint bearing in which there is no pressure effect between the inner surface of the outer ring blank and the outer spherical surface of the inner ring during the manufacturing process. Spherical joint bearing without inner ring action molding method.

The purpose of the present invention can be achieved through the following technical solutions:

，依据压制时间-位移曲线，精确控制模压过程，待上模具到达目标位置，外圈坯料内表面成内球面时，停止模压，模具张开，获得符合游隙要求的自润滑关节轴承，最后，通过对其端面与外表面车磨加工，获得自润滑关节轴承成品。 An integral self-lubricating joint bearing including a bearing inner ring, a bearing outer ring, and a self-lubricating layer adhered to the inner surface of the bearing outer ring. Paste on the inner surface of the outer ring blank, place the inner ring of the bearing in the outer ring blank with a self-lubricating layer, and put the whole on the mandrel in the cavity of the lower mold. The cavity of the upper mold and the lower mold is formed by Composed of a uniform cone surface and a cylindrical hole, the cone angle of the upper mold cavity and the lower mold cavity are between 20°~70°, and the end face of the blank width of the outer ring has a chamfer matching the cone surface of the cavity, and the size of the chamfer for

, according to the pressing time-displacement curve, the molding process is precisely controlled. When the upper mold reaches the target position and the inner surface of the outer ring blank becomes an inner spherical surface, the molding is stopped and the mold is opened to obtain a self-lubricating spherical plain bearing that meets the clearance requirements. Finally, The finished self-lubricating joint bearing is obtained by turning and grinding the end face and the outer surface.

In the forming method, the forming and assembling of the inner surface of the integral bearing outer ring adhered with the self-lubricating layer are carried out at the same time, and during the forming and assembling process of the bearing outer ring, no locking squeeze occurs on the outer spherical surface of the bearing inner ring pressure effect.

Compared with the prior art, the present invention has the following advantages: the present invention solves the problem that the forming and assembly of the existing integrated self-lubricating joint bearing outer ring affects the self-lubricating layer. During the manufacturing process, the gap between the bearing outer ring and the bearing inner ring No locking and extrusion, no damage to the self-lubricating layer, and can form a clearance that meets the requirements of the finished bearing. The manufactured bearing has the characteristics of long service life and high reliability. At the same time, in the production process, the The manufacturing method greatly improves the yield of the bearing.

Description of drawings

Figure 1 is a schematic diagram of the molding process of the present invention.

Fig. 2 is a schematic diagram of the shape change of the bearing outer ring of the present invention;

Figure 3 is the pressing time-displacement curve.

Detailed ways

，芯轴下面有弹簧6支撑，该弹簧可使上述轴承内圈在压制过程中随外圈坯料具有一定的向下移动量。上模具固定在压机的活动砧板下部，下模具固定在压机下砧板上。通过制定时间-位移曲线，控制上模具的下压速度与压下量，且时间-位移曲线是可调的。当上模具到达目标位置时，轴承外圈坯料内表面正好成一个内球面，此时，外圈坯料内表面与轴承内圈外表面无抱死挤压作用，并且外圈坯料内表面与轴承内圈外表面之间的间隙满足整体式自润滑关节轴承的游隙要求，停止模压，模具张开，取出压制后的轴承，最后，按轴承外圈宽度与外径要求，对压制后的轴承进行车磨加工，最终获得符合游隙要求并满足外形尺寸要求的自润滑关节轴承。 As shown in attached drawings 1, 2, and 3, the outer ring blank 2 of the integral self-lubricating joint bearing is a circular cylinder. According to the requirements of different products for the outer ring blank, the outer ring blank is manufactured by turning, and the outer ring The inner surface of the blank is ground, and the self-lubricating layer 3 is adhered to the inner surface of the outer ring blank after grinding. Put the bearing inner ring 4 in the outer ring blank adhered with a self-lubricating layer to form a whole bearing blank; the cavities of the upper mold 1 and the lower mold 7 are both conical surfaces, and there is a cylindrical hole in the middle of the mold, and the upper mold The cavity taper angle 9 and the lower mold cavity taper angle 10 are between 20°~70°. The integral bearing blank is placed on the mandrel 5 in the lower mold cavity, and the end surface of the outer ring blank has a width matching the cavity taper surface The chamfer, the size of the chamfer is

, There is a spring 6 under the mandrel to support, the spring can make the inner ring of the above-mentioned bearing have a certain amount of downward movement with the blank of the outer ring during the pressing process. The upper mold is fixed on the lower part of the movable cutting board of the press, and the lower mold is fixed on the lower cutting board of the press. By formulating the time-displacement curve, the pressing speed and amount of pressing of the upper mold are controlled, and the time-displacement curve is adjustable. When the upper mold reaches the target position, the inner surface of the bearing outer ring blank just forms an inner spherical surface. The gap between the outer surfaces of the rings meets the clearance requirements of the integral self-lubricating spherical plain bearing. Stop molding, open the mold, and take out the pressed bearing. Finally, according to the width and outer diameter of the bearing outer ring, the pressed bearing is Turning and grinding, and finally obtain a self-lubricating joint bearing that meets the clearance requirements and meets the external dimension requirements.

Claims (6)

1. A molding method for integral self-lubricating spherical plain bearings without inner ring action, characterized in that: the self-lubricating layer is attached to the inner surface of the outer ring blank, and the inner ring of the bearing is placed on the outer ring blank adhered with the self-lubricating layer and put the whole on the mandrel in the cavity of the lower mold. The cavity of the upper mold and the lower mold is composed of a conical surface and a cylindrical hole. The end surface of the outer ring blank has a chamfer matching the conical surface of the cavity. , the chamfer size is

, according to the pressing time-displacement curve, the molding process is precisely controlled. When the upper mold reaches the target position and the inner surface of the outer ring blank becomes an inner spherical surface, the molding is stopped and the mold is opened to obtain a self-lubricating spherical plain bearing that meets the clearance requirements. Finally, The finished self-lubricating joint bearing is obtained by turning and grinding the end face and the outer surface. 2. The molding method of integral self-lubricating spherical plain bearing without inner ring action according to claim 1, characterized in that: the forming and assembling of the inner surface of the outer ring of the integral bearing with the self-lubricating layer adhered are carried out simultaneously, And in the process of forming and assembling the outer ring of the bearing, there is no locking and squeezing effect on the outer spherical surface of the inner ring of the bearing. 3. The integral self-lubricating spherical plain bearing according to claim 1, characterized in that: the blank of the outer ring is a circular cylinder. 4. The integral self-lubricating joint bearing without inner ring action molding method according to claim 1, characterized in that: the cavity taper angle of the upper mold and the cavity taper angle of the lower mold are both between 20° and 70°. 5. The integral self-lubricating spherical plain bearing without inner ring effect molding method according to claim 1, characterized in that: the upper mold is fixed on the lower part of the movable cutting board of the press, and the lower mold is fixed on the lower cutting board of the press. 6. The integral self-lubricating joint bearing without inner ring effect molding method according to claim 1, characterized in that: the time-displacement curve of the pressing of the upper mold is adjustable.

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