CN217990861U

CN217990861U - Ring mould for casting four piston rings

Info

Publication number: CN217990861U
Application number: CN202221644535.9U
Authority: CN
Inventors: 喻晓妹
Original assignee: Nanjing Feiyan Piston Ring Co ltd
Current assignee: Nanjing Feiyan Piston Ring Co ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-12-09
Anticipated expiration: 2032-06-29

Abstract

The utility model discloses a be used for four as cast ring moulds of piston ring, this ring mould be provided with the enhancement piece in positioning groove's corresponding position, strengthen the piece for set up in the circular arc in the positioning groove outside is protruding. The utility model discloses an outwards increased the enhancement piece to the excircle of the positioning groove's of ring mould part, complemented positioning groove's intensity, avoided because intensity is not enough and at the cracked problem of casting process or subsequent grinding process.

Description

Ring mould for casting four piston rings

Technical Field

The utility model relates to a piston ring field, in particular to a ring mould for four cast of piston ring.

Background

Cast iron piston ring systems are produced by casting a blank which is cast from pig iron and the required alloying elements after melting in a mold, which is referred to as a ring mold. In the piston ring industry, the production mode of a blank successively adopts single-piece casting and double-piece casting, wherein the single-piece casting is to produce a piece of finished product by one piece of blank, and the double-piece casting is to cut a thicker piece of blank to produce two pieces of finished products.

The existing ring mould has a non-perfect circular profile, has a structure with an inner concave positioning part, and the concave positioning part of the piston ring cast by the ring mould is cut off and used as a free opening of the piston ring. It has been found that piston rings cast of alloyed cast iron materials are susceptible to breakage during the casting process and/or during subsequent grinding and/or slicing processes due to insufficient strength at the location of the recess.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to solve the problem of the prior art, the utility model provides a be used for four as cast ring moulds of piston ring, this ring mould concave location department not take place fracture problem, production efficiency is high.

The technical scheme is as follows: be used for four cast ring moulds of piston ring, this ring mould be provided with the enhancement piece in positioning groove's corresponding position, strengthen the piece for set up in the circular arc in the positioning groove outside is protruding.

As a preferred structure of the utility model, the excircle draft inclination of the ring die is 0.5-1.5 degrees; the inner circle drawing slope of the ring die is 1-2 degrees.

As an optimized structure of the utility model, the height of the bulge of the reinforcing sheet is 0.8-1.3 mm.

As an optimized structure of the utility model, the circular arc of the reinforcing sheet is in the respective 30 within ranges of the direction theoretical central line both sides of the minor axis of the ring die.

As an optimized structure of the utility model, the depth of the positioning groove is 1.6-2.0 mm.

As an optimized structure of the utility model, the width of the positioning groove is 5.4-6.1 mm.

As an optimized structure of the utility model, the diameter of the positioning groove is 3.2mm.

As an optimized structure of the utility model, the roughness of the upper end surface of the ring die and the lower end surface of the ring die is less than or equal to Ra0.8 mu m

As a preferred structure of the utility model, the roughness of the inner circle surface of the ring mould and the outer circle surface of the ring mould is less than or equal to Ra1.6 mu m.

As an optimized structure of the utility model, the height of the ring mold is (h 1+ E) × 4+ f, wherein h1 is the ring height of the finished piston ring, E is the end face grinding allowance reserved for each piston ring, and E = 0.2-0.4 mm; f is the thickness of the slicing cutter and the machining allowance of the precutting size of the upper end surface and the lower end surface of the ring die, and F = 6.5-7.9 mm.

Has the beneficial effects that: (1) The utility model adds materials outwards on the excircle of the inner circle positioning groove of the ring die, supplements the strength of the part, and avoids the problem of fracture in the casting process and/or the subsequent grinding and/or slicing process due to insufficient strength; (2) The utility model discloses further improved the draft and the ring die height of ring die, this ring die can be used for four casts of piston ring, and the casting drawing is smooth, follow-up machining allowance is reasonable, and production efficiency is high.

Drawings

FIG. 1 is a schematic view of the ring mold structure of the present invention;

FIG. 2 is a cross-sectional view of the ring die of the present invention;

fig. 3 is a schematic cross-sectional view of the ring die cast blank of the present invention in the subsequent slicing process.

Detailed Description

Example (b): the utility model discloses a ring mould 1 is provided with at positioning groove 101's outer disc and strengthens piece 102, guarantees not the problem of splitting in positioning groove 101 department of ring mould 1, improves production efficiency. As shown in fig. 1, the material used for the ring die 1 in this embodiment is cast steel. In order to control the machining allowance of the subsequent radial thickness machining process and facilitate the drawing of the molding process, the ring die 1 is provided with draft angles of an inner circle and an outer circle which are respectively alpha and beta, namely the cross section of the ring die 1 is trapezoidal, wherein the draft angle of the inner circle is alpha = 1-2 degrees, and alpha =1.5 degrees is taken as a preferred embodiment; the draft angle of the outer circle is beta = 0.5-1.5 degrees, and as a preferred embodiment, the draft angle of the outer circle is preferably beta =1 degree; thus, when the radial thickness T1 of the upper end surface of the ring die 1 is obtained, the radial thickness T of the lower end surface can be calculated by a trigonometric function relationship.

Wherein: t1 (mm) = a1+ (1.8-2.5) mm, and as a preferred embodiment, T1 (mm) = a1+2.0mm, a1 is the radial thickness of the finished piston ring.

In this embodiment, the positioning groove 101 is a segment of an inwardly concave arc structure, and the positioning groove 101 in this embodiment selects the following structure: the depth A of the positioning groove 101 is 1.6-2.0 mm, and the width D of the positioning groove 101 is 5.4-6.1 mm; the circular arc diameter of the positioning groove 101 is R3.2mm.

In this embodiment, the reinforcing plate 102 is a section of a convex part at the outer circle of the ring die 1, the longer diameter of the ring die 1 is phi long, the shorter diameter of the ring die 1 is phi short, and the reinforcing plate 102 and the ring die 1 are connected

A short projection distance C of the theoretical contour line, C = 0.8-1.3, C =1.0mm as a preferred embodiment; the convex part of the reinforcing sheet 102 on the outer circle of the ring die 1 is the theoretical central line O in the short-diameter direction ₁ Both sides are within 30 degrees.

As shown in fig. 2 and 3, the height B = (h 1+ E) × 4+ f of the ring mold 1, where h1 is the ring height of the finished piston ring, and E is the end face grinding allowance reserved for each ring, and in this embodiment, E =0.2 to 0.4mm, and preferably E =0.3mm. F is a machining allowance including the thickness of the slicing tool 2 and the precut size of the upper and lower end faces, and in the present embodiment, F =6.5 to 7.9mm, preferably F =7.2mm.

As shown in FIG. 2, the roughness of the upper and lower end faces of the ring mold Ra0.8 μm or less, and the roughness of the inner and outer circles of the ring mold 1 Ra1.6 μm or less.

The ring mould has non-circular outer circle profile and is divided into long diameter

Long and short diameter

Short, due to the trapezoidal cross-section, here

Length and sum

The short is measured by the size of the lower end face (the end with large radial thickness).

Wherein: d _{Long and long} 、D _{Short length} The long diameter and the short diameter which are respectively required to be obtained in the subsequent inner and outer circle copying turning process are obtained by the process design calculation of the piston ring; xi 1 and xi 2 are respectively the shrinkage coefficients of the blank size and the ring mold size in the long diameter direction and the short diameter direction after casting, and xi 1 is 1.006-1.017, preferably xi 1 is 1.0115; ξ 2= 1.005-1.015, preferably ξ 1=1.010; g is a radial allowance correction value, G =0.2 to 0.5, preferably G =0.25 to 0.35mm.

The application example is as follows: taking an alloy cast iron ring with the cylinder diameter of 90mm as an example, the ring height h1=2.5mm, the radial thickness a1=3.9mm and D required by the inner and outer circle copying turning process _{Is long and long} ＝95.17、D _{Short length} =93.21. The four-piece cast ring mold size: the inner draft α =1.5 °, and the outer draft β =1 °. Ring mold axial height B = (2.5 + 0.3) × 4+7.2=18.4mm. The radial thickness T1=3.9+2.0=5.9mm of the upper end face of the ring mold 1; the radial thickness T = T1+18.4 × (TAN 1.5+ TAN 1.0) =6.7mm at the lower end face of the ring die 1.

The size of the part of the positioning groove 101 takes the following parameters: the depth of the positioning groove A =1.7mm; the width D =5.5mm of the positioning groove; the arc of the positioning groove is R3.2mm.

The projecting part of the reinforcing sheet, i.e. the outer-cylindrical projecting part and

the protrusion distance C =1.0mm of the short theoretical contour, in which case the protrusion is included

The short actual value is 97.06+1.0=98.06mm. The outer circular convex part of the reinforcing plate 102 is within 30 degrees on both sides of the theoretical center line in the short-diameter direction. The roughness of the upper and lower end surfaces of the ring die 1 is less than Ra0.8 mu m, and the roughness of the inner and outer circles is less than Ra1.6 mu m.

Claims

1. The ring die for casting the four piston rings is characterized in that a reinforcing sheet (102) is arranged at a position corresponding to a positioning groove (101) of the ring die (1), and the reinforcing sheet (102) is an arc bulge arranged on the outer side of the positioning groove (101).

2. The ring mold for four-piece casting of piston rings according to claim 1, characterized in that the draft of the outer circle of the ring mold (1) is 0.5 to 1.5 °; the inclination of the inner circle drawing die of the ring die (1) is 1-2 degrees.

3. The ring mold for four-piece casting of a piston ring according to claim 1, wherein the reinforcement piece (102) has a protrusion height of 0.8 to 1.3mm.

4. The ring mold for four-piece casting of piston rings according to claim 1, characterized in that the circular arcs of the reinforcing pieces (102) are within 30 ° of each side of the theoretical center line of the direction of the minor axis of the ring mold (1).

5. A ring mould for four-piece casting of piston rings according to claim 1, characterized in that the depth of the positioning groove (101) is 1.6-2.0 mm.

6. A ring mould for four-piece casting of piston rings according to claim 1, characterized in that the width of the positioning groove (101) is 5.4-6.1 mm.

7. A ring mould for four-piece casting of piston rings according to claim 1, characterized in that the diameter of the positioning groove (101) is 3.2mm.

8. The ring mold for four-piece casting of piston rings according to claim 1, characterized in that the roughness of the upper end surface of the ring mold (1) and the lower end surface of the ring mold is ≦ Ra0.8 μm.

9. The ring mould for the four-piece casting of piston rings according to claim 1, characterized in that the roughness of the inner circular surface of the ring mould (1) and the outer circular surface of the ring mould (1) is ≤ ra1.6 μm.

10. The ring mold for four-piece casting of piston rings as claimed in claim 1, wherein the height of the ring mold (1) is (h 1+ E) × 4+ F, wherein h1 is the ring height of the finished piston ring, E is the reserved end face grinding allowance of each piston ring, and E = 0.2-0.4 mm; f is the thickness of the slicing cutter and the machining allowance of the precutting size of the upper end face and the lower end face of the ring die, and F = 6.5-7.9 mm.