Composite material molded article and method for manufacturing same

A composite material molded article, comprising:

• a molded product of a molding material containing a resin and fibers,
• wherein an average of the following fiber orientation degree f in the following region A of the molded product is 0.20 or more and 1 or less,
• region A:
• in a case where a distance between one point at each of edges of a surface of a first end portion of the molded product and edges of the other end portion is measured along a vertical direction perpendicular to lateral faces of the first end portion within a surface of the molded product, and points separated from the one point by a distance equivalent to 3.0% of the distance measured from the one point are connected with a line along the edges of the first end portion of the molded product, a region surrounded with the line and edges of the molded product is regarded as a region A,
• fiber orientation degree f:
• in a case where the vertical direction is named 90° direction, a direction orthogonal to the vertical direction is named 0° direction, and an X-ray diffracted at a diffraction angle 2θ of 25.4° is detected by X-ray diffraction, a fiber orientation degree based on the 0° direction that is calculated from the following Equations (1), (2), and (3) is a fiber orientation degree f,
• f
• =
• 2
• ⁢
• ⁢
• a
• -
• 1
• (
• 1
• )
• a
• =
• ∑
• i
• =
• 1
• N
• ⁢
• I
• ⁡
• (
• Φ
• i
• )
• ⁢
• ⁢
• cos
• 2
• ⁢
• Φ
• i
• ∑
• i
• =
• 1
• N
• ⁢
• I
• ⁡
• (
• Φ
• i
• )
• (
• 2
• )
• ∫
• 0
• 360
• ⁢
• I
• ⁡
• (
• Φ
• )
• ⁢
• d
• ⁢
• ⁢
• Φ
• =
• ⁢
• ∑
• i
• =
• 2
• N
• ⁢
• (
• I
• ⁡
• (
• Φ
• i
• )
• +
• I
• ⁡
• (
• Φ
• i
• -
• 1
• )
• )
• ×
• d
• ⁢
• ⁢
• Φ
• ×
• 1
• 2
• =
• 10000
• (
• 3
• )
• a in Equation (1) is a coefficient of orientation expressed by Equation (2), I(φi) is a luminance at an i-th rotation angle (φi) in the X-ray diffraction and is normalized such that an integrated intensity expressed by Equation (3) becomes 10,000, N in Equation (3) is the number of measurement points, and the number of measurement points is a value obtained by dividing 360(°) by a step size (°) that is an angle by which a molded product as a measurement target is rotated whenever the X-ray diffraction is measured, do in the same equation represents a micro-region of the rotation angle around the molded product as a measurement target, and do equals a value of the step size,
• wherein the following function of the region A of the molded product has a negative slope,
• function:
• a linear function obtained by measuring the fiber orientation degree f for two points at both end portions of a straight line extending in the vertical direction in the region A and for two or more points closer to the inside than the two points, plotting a distance (mm) between each of the points and the lateral faces of the first end portion on an x axis, plotting the fiber orientation degree f on a y axis, and performing linear approximation by a least square method.