Powder metallurgy plunger pump cylinder body side core rod die

Abstract

The utility model relates to a powder metallurgy plunger pump cylinder body side core rod die which comprises a middle die, an upper punch, a lower punch, a side core rod and a core rod, one end of the upper punch directly forms an upper punch face of a plunger pump cylinder body product, and the lower punch face of the plunger pump cylinder body product is correspondingly provided with one end face of the lower punch. The plunger hole and the kidney-shaped hole of the lower punch face are correspondingly provided with the top end faces of the side core rods, the spline hole of the lower punch face is correspondingly provided with one end face of the core rod, the inner ring portion of the middle die is connected to the lower punch in a sleeved mode, the lower punch is connected to the core rod in a sleeved mode, and the side core rods are arranged between the lower punch and the inner ring portion of the middle die. According to the die, the kidney-shaped hole and the plunger hole of a plunger pump cylinder body product can be integrally formed, the position relation of the plunger hole and the kidney-shaped hole and the high-precision size requirement of the plunger hole and the kidney-shaped hole are guaranteed, and the problem of rotation of the side core rod in the pressing process is solved through concave-convex structure matching of the side core rod and the side core rod pressing pad.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy, in particular to a powder metallurgy plunger pump cylinder body side core rod mold. Background Art

[0002] The piston pump cylinder is a key component in the hydraulic system piston pump series and plays a vital role in the entire product series. The usual cylinder material is cast iron or pure copper for rough processing, while powder metallurgy can achieve the required shape and size accuracy with less processing.

[0003] As for the transformation of powder metallurgy cylinder parts, it is essential to ensure the shape of the parts and the accuracy of the products, especially the positional relationship between the plunger hole and the waist hole, as well as the dimensional accuracy.

[0004] Another difficulty lies in the perfect match between the upper punch and the side core rod. The plunger hole is round, and the waist hole is flat. In order to prevent the round plunger hole from rotating during the molding process, causing the upper punch to be unable to enter the side core rod and causing mold damage, a special precise positioning method needs to be considered to meet the requirements. Utility Model Content

[0005] The utility model aims to overcome the problems existing in the prior art and provides a powder metallurgy plunger pump cylinder side core rod mold.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0007] A powder metallurgy plunger pump cylinder side core rod mold, comprising a middle mold, an upper punch, a lower punch, a side core rod and a core rod, one end of the upper punch directly forms the upper punch surface of the plunger pump cylinder product, one end surface of the lower punch is correspondingly arranged at the lower punch surface of the plunger pump cylinder product, the top end surface of the side core rod is correspondingly arranged at the plunger hole and waist hole position of the lower punch surface, and one end surface of the core rod is correspondingly arranged at the spline hole position of the lower punch surface, the inner ring portion of the middle mold is sleeved on the lower punch, the lower punch is sleeved on the core rod, and the side core rod is arranged between the lower punch and the inner ring portion of the middle mold.

[0008] Furthermore, the other end of the upper punch is padded with an upper punch pressure pad, the other end of the lower punch is padded with a lower punch pressure pad, a lower punch gasket is provided between the pad connection surfaces of the lower punch and the lower punch pad, the outer end surface of the lower punch pad is fixedly connected to the lower punch transition pad, the front step surface of the middle die is provided with a middle die pressure cover, the rear step surface is provided with a middle die pressure pad, the bottom end surface of the side core rod is padded on the side core rod pressure pad, the outer end surface of the side core rod pressure pad is fixedly connected to the side core rod transition pad, a side core rod gasket is provided on the bottom step surface of the side core rod, one end of the side core rod gasket is padded with the inner end surface of the side core rod pressure pad, and the other end is padded with the side core rod pressure cover, and the other end surface of the core rod is padded with the core rod pressure pad.

[0009] Furthermore, the top end surface of the side core rod is provided with a waist-shaped portion for cooperating to form a waist-shaped hole of the plunger pump cylinder product, and the side core rod body at the rear end of the waist-shaped portion is a cylindrical portion for cooperating to form a plunger hole of the plunger pump cylinder product.

[0010] Furthermore, a protrusion is provided on the bottom end face of the side core rod, and a plurality of grooves are provided on the side of the side core rod pressure pad that is cushioned with the bottom end face of the side core rod. The side core rod pressure pad is plugged and matched with the protrusions of each side core rod through the grooves.

[0011] Furthermore, the side core rod is made of high-toughness CPM material.

[0012] Furthermore, the surface of the edge core rod is provided with a TiN coating with high wear resistance.

[0013] The beneficial effects of the utility model are:

[0014] The mold of the utility model can complete the integrated molding of the waist-shaped hole and the plunger hole of the plunger pump cylinder product, and ensure the positional relationship between the plunger hole and the waist-shaped hole, as well as the high-precision size requirements of the plunger hole and the waist-shaped hole. The side core rod is matched with the concave-convex structure of the side core rod pressure pad to solve the rotation problem of the side core rod during the pressing process, and the damage of the upper punch and the side core rod caused by the inability of the upper punch to enter the side core rod is prevented, thereby maximizing the service life of the mold and greatly saving the mold use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the mold structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of the side core rod of the utility model;

[0017] Figure 3 It is a partial enlarged structural diagram of the top end surface of the side core rod of the utility model;

[0018] Figure 4 It is a partial enlarged structural diagram of the bottom end surface of the side core rod of the utility model;

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure of the side core rod pressure pad of the utility model;

[0020] Figure 6 It is a schematic diagram of the three-dimensional structure of the plunger pump cylinder product of the utility model.

[0021] Explanation of numbers in the figure: 1. middle die, 2. upper punch, 3. lower punch, 4. side core rod, 41. waist-shaped part, 42. cylindrical part, 43. protruding part, 5. core rod, 6. lower punch pad, 7. lower punch gasket, 8. side core rod pressure pad, 81. groove part, 9. side core rod gasket, 10. side core rod pressure cover, 11. upper punch pressure pad, 12. lower punch transfer pad, 13. side core rod transfer pad, 14. core rod pressure pad, 15. middle die pressure pad, 16. middle die pressure cover, 17. plunger pump cylinder product, 171. plunger hole, 172. waist-shaped hole, 173. spline hole. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0023] like Figure 1 As shown, a powder metallurgy plunger pump cylinder side core rod mold includes a middle mold 1, an upper punch 2, a lower punch 3, a side core rod 4 and a core rod 5, one end of the upper punch 2 directly forms the upper punch surface of the plunger pump cylinder product 17, one end face of the lower punch 3 is correspondingly arranged at the lower punch surface of the plunger pump cylinder product 17, the top end face of the side core rod 4 is correspondingly arranged at the position of the plunger hole 171 and the waist hole 172 of the lower punch surface, and one end face of the core rod 5 is correspondingly arranged at the position of the spline hole 173 of the lower punch surface, the inner ring portion of the middle mold 1 is sleeved on the lower punch 3, the lower punch 3 is sleeved on the core rod 5, and the side core rod 4 is arranged between the lower punch 3 and the inner ring portion of the middle mold 1.

[0024] The other end of the upper punch 2 is padded with an upper punch pressure pad 11, and the other end of the lower punch 3 is padded with a lower punch pad 6. A lower punch gasket 7 is provided between the padding surfaces of the lower punch 3 and the lower punch pad 6. The outer end surface of the lower punch pad 6 is fixedly connected to the lower punch transition pad 12. A middle die pressure cover 16 is provided on the front step surface of the middle die 1, and a middle die pressure pad 15 is provided on the rear step surface. The bottom end surface of the side core rod 4 is padded on the side core rod pressure pad 8, and the outer end surface of the side core rod pressure pad 8 is fixedly connected to the side core rod transition pad 13. A side core rod gasket 9 is provided on the bottom step surface of the side core rod 4, one end of the side core rod gasket 9 is padded with the inner end surface of the side core rod pressure pad 8, and the other end is padded with the side core rod pressure cover 10. The other end surface of the core rod 5 is padded with the core rod pressure pad 14.

[0025] like Figure 2 , Figure 3 and Figure 6As shown, the top end surface of the side core rod 4 is provided with a waist-shaped portion 41, which is used to cooperate to form a waist-shaped hole 172 of the plunger pump cylinder product 17, and the side core rod body at the rear end of the waist-shaped portion 41 is a cylindrical portion 42, which is used to cooperate to form the plunger hole 171 of the plunger pump cylinder product 17.

[0026] like Figure 2 , Figure 4 and Figure 5 As shown, the bottom end face of the side core rod 4 is provided with a protrusion 43, with a dimensional tolerance of 12.5±0.01 and a height tolerance of 5±0.01. The side core rod pressure pad 8 and the bottom end face of the side core rod 4 are cushioned with a plurality of grooves 81, with a dimensional tolerance of 12.53±0.01 and a height tolerance of 3.5±0.01. The side core rod pressure pad 8 is plugged into and matched with the protrusions 43 of each side core rod 4 through the grooves 81, which can completely solve the rotation problem of the side core rod 4 during the pressing process.

[0027] The side core rod 4 is made of CPM material with high toughness.

[0028] The surface of the side core rod 4 is provided with a TiN coating with high wear resistance.

[0029] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A powder metallurgy plunger pump cylinder side core rod mold, characterized in that: The invention comprises a middle die (1), an upper punch (2), a lower punch (3), a side core rod (4) and a core rod (5); one end of the upper punch (2) directly forms the upper punch surface of a plunger pump cylinder product (17); one end surface of the lower punch (3) is correspondingly arranged at the lower punch surface of the plunger pump cylinder product (17); the top end surface of the side core rod (4) is correspondingly arranged at the positions of the plunger hole (171) and the waist hole (172) of the lower punch surface; one end surface of the core rod (5) is correspondingly arranged at the position of the spline hole (173) of the lower punch surface; the inner ring portion of the middle die (1) is sleeved on the lower punch (3); the lower punch (3) is sleeved on the core rod (5); and the side core rod (4) is arranged between the lower punch (3) and the inner ring portion of the middle die (1).

2. The powder metallurgy plunger pump cylinder side core rod mold according to claim 1, characterized in that: The other end of the upper punch (2) is padded with an upper punch pressure pad (11), the other end of the lower punch (3) is padded with a lower punch pressure pad (6), a lower punch gasket (7) is provided between the pad connection surfaces of the lower punch (3) and the lower punch pad (6), the outer end surface of the lower punch pad (6) is fixedly connected to the lower punch transfer pad (12), a middle die pressure cover (16) is provided on the front step surface of the middle die (1), and a middle die pressure pad (15) is provided on the rear step surface, The bottom end face of the side mandrel (4) is padded on the side mandrel pressure pad (8), the outer end face of the side mandrel pressure pad (8) is fixedly connected to the side mandrel transition pad (13), a side mandrel gasket (9) is provided on the bottom step surface of the side mandrel (4), one end of the side mandrel gasket (9) is padded on the inner end face of the side mandrel pressure pad (8), and the other end is padded on the side mandrel pressure cover (10), and the other end face of the mandrel (5) is padded on the mandrel pressure pad (14).

3. The powder metallurgy plunger pump cylinder side core rod mold according to claim 2, characterized in that: The top end surface of the side core rod (4) is provided with a waist-shaped portion (41) for cooperating to form a waist-shaped hole (172) of a plunger pump cylinder product (17); the side core rod body at the rear end of the waist-shaped portion (41) is a cylindrical portion (42) for cooperating to form a plunger hole (171) of a plunger pump cylinder product (17).

4. The powder metallurgy plunger pump cylinder side core rod mold according to claim 3, characterized in that: The bottom end surface of the side core rod (4) is provided with a protrusion (43), and the side core rod pressure pad (8) is provided with a plurality of grooves (81) on the side surface that is cushioned with the bottom end surface of the side core rod (4). The side core rod pressure pad (8) is plugged into and matched with the protrusions (43) of each side core rod (4) through the grooves (81).

5. The powder metallurgy plunger pump cylinder side core rod mold according to claim 1 or 4, characterized in that: The side core rod (4) is made of high-toughness CPM material.

6. The powder metallurgy plunger pump cylinder side core rod mold according to claim 5, characterized in that: The surface of the side core rod (4) is provided with a TiN coating with high wear resistance.

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